A DOUBLE-CIRCUIT ELECTRIC BOILER (VARIANTS)

Abstract

The invention is a double-circuit electric boiler for boiling a warming heat-carrying agent and a residential hot water. A hot water supply circuit first container and a second container with an electric heater for the heat-carrying agent of a warming circuit are arranged in a housing. Outer surfaces of inner walls of the warming circuit second container are in a contact with the water of the hot water supply circuit inside the first container. The electric heater for the heat-carrying agent is isolated by the second container walls from a contact with the water of the hot water supply circuit inside the first container. Both containers have separate inlet and outlet ducts and separate isolated temperature sensors. In a second embodiment of the boiler, an electric heater having heating areas isolated by the inner walls of the second container is further mounted in the first container.

Claims

1. A double-circuit electric boiler, comprising: a power supply system, control elements, a housing (5) having inside a container (1) for a water of a hot water supply circuit and a container (2) for a heat-carrying agent of a warming circuit, wherein at least one electric heater (3) of the heat-carrying agent of the warming circuit is mounted inside the container (2), and each of said two containers (1), (2) comprises an inlet (9,11) and an outlet ducts (8,10), and the container (1) for the water of the hot water supply circuit comprises a heat insulation layer (4), characterized in that the container (2) for the heat-carrying agent of the warming circuit, along with the at least one electric heater (3) of the heat-carrying agent of the warming circuit mounted in the container (2), is mounted and sealably and rigidly secured inside the container (1) for the water of the hot water supply circuit such that one of surfaces of the container (2) for the heat-carrying agent of the warming circuit is an outer wall (7) that is disposed and secured outside the container (1) for the water of the hot water supply circuit such that an inner surface (29) of the outer wall (7) is in a contact with a mounting wall (16) of the container (1) of the hot water supply circuit, and an outer surface (30) of the outer wall (7) is disposed outside the container (1) of the hot water supply circuit, wherein the outer surfaces of inner walls (6) of the container (2) of the heat-carrying agent of the warming circuit that is disposed inside the container (1) for the water of the hot water supply circuit are in contact with the water of the hot water supply circuit inside the container (1) for the water of the hot water supply circuit, furthermore, the at least one electric heater (3) for the heat-carrying agent of the warming circuit is fully isolated by the inner walls (6) of the container (2) of the warming circuit from a contact with the water of the hot water supply circuit that is disposed inside the container (1) of the hot water supply circuit, wherein the outlet duct (8) for drain of the heat-carrying agent from the container (2) of the warming circuit and the inlet duct (9) for supplying the heat-carrying agent into the container (2) of the warming circuit are sealably mounted and secured in technological openings of the outer wall (7) of the container (2) of the warming circuit, and their end openings are sealably coupled to the corresponding technological openings of the container (2) of the warming circuit inside the container (1) of the hot water supply circuit, and an outlet duct (10) for drain of the water from the container (1) of the hot water supply circuit and an inlet duct (11) for supplying the water into the container (1) of the hot water supply circuit are sealably mounted and secured in the corresponding technological openings of one of the walls of the container (1) of the hot water supply circuit such that their end openings are disposed inside the container (1) of the hot water supply circuit and areas of these outlet (10) and inlet (11) ducts, which are disposed inside the container (1) for the water of the hot water supply circuit, are fully isolated by the inner walls (6) of the container (2) of the heat-carrying agent of the warming circuit from a contact with the heat-carrying agent in the container (2) of the warming circuit, furthermore, inside the container (2) of the warming circuit, there is mounted a temperature sensor (12) for the heat-carrying agent in the container (2) of the warming circuit such that this temperature sensor (12) is fully isolated by the inner walls (6) of the container (2) from a contact with the water in the container (1) of the hot water supply circuit, and inside the container (1) of the hot water supply circuit, there is mounted a temperature sensor (13) for the water in the container (1) such that this temperature sensor (13) is fully isolated by the inner walls (6) of the container (2) from a contact with the heat-carrying agent in the container (2) of the warming circuit.

2. A double-circuit electric boiler, comprising: a power supply system, control elements, a housing (5) having inside a container (1) for a water of a hot water supply circuit, the container (1) having inside at least one electric heater (27) for the water of the hot water supply circuit, and a container (2) for a heat-carrying agent of a warming circuit, wherein at least one electric heater (3) of the heat-carrying agent of the warming circuit is mounted inside the container (2), and each of said two containers (1), (2) comprises an inlet and an outlet ducts (9,11 and 8,10), and the container (1) for the water of the hot water supply circuit comprises a heat insulation layer (4), characterized in that the container (2) for the heat-carrying agent of the warming circuit, along with the at least one electric heater (3) of the heat-carrying agent of the warming circuit mounted in the container, is mounted and sealably and rigidly secured inside the container (1) for the water of the hot water supply circuit such that one of surfaces of the container (2) for the heat-carrying agent of the warming circuit is an outer wall (7) that is disposed and secured outside the container (1) for the water of the hot water supply circuit such that an inner surface (29) of the outer wall (7) is in a contact with a mounting wall (16) of the container (1) of the hot water supply circuit, and an outer surface (30) of the outer wall (7) is disposed outside the container (1) of the hot water supply circuit, wherein the outer surfaces of inner walls (6) of the container (2) of the heat-carrying agent of the warming circuit that is disposed inside the container (1) for the water of the hot water supply circuit are in a contact with the water of the hot water supply circuit inside the container (1) for the water of the hot water supply circuit, furthermore, the at least one electric heater (3) of the heat-carrying agent of the warming circuit is fully isolated by the inner walls (6) of the container (2) of the warming circuit from a contact with the water of the hot water supply circuit that is disposed inside the container (1) of the hot water supply circuit, wherein the outlet duct (8) for drain of the heat-carrying agent from the container (2) of the warming circuit and the inlet duct (9) for supplying the heat-carrying agent into the container (2) of the warming circuit are sealably mounted and secured in technological openings of the outer wall (7) of the container (2) of the warming circuit, and their end openings are sealably coupled to the corresponding technological openings of the container (2) of the warming circuit inside the container (1) of the hot water supply circuit, and an outlet duct (10) for drain of the water from the container (1) of the hot water supply circuit and an inlet duct (11) for supplying the water into the container (1) of the hot water supply circuit are sealably mounted and secured in the corresponding technological openings of one of the walls of the container (1) of the hot water supply circuit such that their end openings are disposed inside the container (1) of the hot water supply circuit and areas of these outlet (10) and inlet (11) ducts, which are disposed inside the container (1) for the water of the hot water supply circuit, are fully isolated by the inner walls (6) of the container (2) of the heat-carrying agent of the warming circuit from a contact with the heat-carrying agent in the container (2) of the warming circuit, furthermore, inside the container (2) of the warming circuit, there is mounted a temperature sensor (12) for the heat-carrying agent in the container (2) of the warming circuit such that this temperature sensor (12) is fully isolated by the inner walls (6) of the container (2) from a contact with the water in the container (1) of the hot water supply circuit, and inside the container (1) of the hot water supply circuit, there is mounted a temperature sensor (13) for the water in the container (1) such that this temperature sensor (13) is fully isolated by the inner walls (6) of the container (2) for the heat-carrying agent of the warming circuit from a contact with the heat-carrying agent in the container (2) of the warming circuit, furthermore, the at least one electric heater (27) for the water of the hot water supply circuit is mounted and sealably secured in the corresponding technological opening of one of the walls of the container (1) for the water of the hot water supply circuit in such a way that heating sections of the electric heater (27) are disposed inside the container (1) of the hot water supply circuit and are fully isolated by the inner walls (6) of the container (2) for the heat-carrying agent of the warming circuit from a contact with the heat-carrying agent in the container (2) of the warming circuit.

3. The double-circuit electric boiler according to claim 1 or claim 2, characterized in that heat exchange ribs (14) are disposed on outer surfaces of the inner walls (6) of the container (2) of the heat-carrying agent of the warming circuit.

4. The double-circuit electric boiler according to claim 1 or claim 2 or claim 3, characterized in that the outer wall (7) of the container (2) for the heat-carrying agent of the warming circuit is made in the form of a flange (15) that is a bottom of the container (2) for the heat-carrying agent of the warming circuit and that is connected to the inner walls (6) in the lower portion of the container (2) for the heat-carrying agent of the warming circuit, wherein the outer wall (7) in a form of the flange (15) is configured to be sealably secured to one of the walls of the container (1) of the hot water supply circuit.

5. The double-circuit electric boiler according to claim 1 or claim 2 or claim 3 or claim 4, characterized in that the at least one electric heater (3) for the water-carrying agent of the warming circuit is mounted and fixed to an additional flange (17) that is, in turn, mounted and sealably secured in a corresponding technological opening of the outer wall (7) of the container (2) of the warming circuit or the electric heater (3) of the heat-carrying agent of the warming circuit is mounted and sealably secured in the corresponding technological opening of the outer wall (7) that is made in the form of the flange (15) that is a bottom of the container (2) for the heat-carrying agent of the warming circuit.

6. The double-circuit electric boiler according to claim 1 or claim 2 or claim 3 or claim 4 or claim 5, characterized in that the boiler comprises at least one additional electric heater (18) of the heat-carrying agent of the warming circuit that is mounted and sealably secured in the corresponding technological opening of the outer wall (7) of the container (2) for the heat-carrying agent of the warming circuit or is mounted and secured to the additional flange (17) that is, in turn, mounted and sealably secured in the corresponding technological opening of the outer wall (7) of the container (2) for the heat-carrying agent of the warming circuit or in the technological opening of the outer wall (7) that is made in the form of flange (15) that is the bottom of the container (2) for the heat-carrying agent of the warming circuit.

7. The double-circuit electric boiler according to claim 5 or claim 6, characterized in that the temperature sensor (12) for the heat-carrying agent in the container (2) of the warming circuit is mounted and sealably secured to the additional flange (17).

8. The double-circuit electric boiler according to claim 1 or claim 2 or claim 3 or claim 4 or claim 5 or claim 6 or claim 7, characterized in that it further comprises a flow monitoring sensor (19) for the heat-carrying agent of the warming circuit, a pump (20) of the warming circuit and a safety valve (21) of the warming circuit, which are mounted on an outlet pipe (22) of the warming circuit that is, in turn, coupled to the outlet duct (8) for drain of the heat-carrying agent from the container (2) of the warming circuit.

9. The double-circuit electric boiler according to claim 8, characterized in that an expansion tank (23) is connected to the outlet pipe (22) of the warming circuit.

10. The double-circuit electric boiler according to any one of claims 1-9, characterized in that the boiler control elements are made in a form of an electronic system that comprises a controller (25), and this electronic system is assembled on a control panel (26) that is secured on a wall of the boiler housing (5), and a power supply and also the at least one electric heater (3) for the heat-carrying agent of the warming circuit, the temperature sensor (12) for the heat-carrying agent of the warming circuit, and the temperature sensor (13) for the water in the container (1) of the hot water supply circuit are coupled to the control panel (26).

11. The double-circuit electric boiler according to claim 8, characterized in that the boiler control elements are made in a form of an electronic system that comprises a controller (25), and this electronic system is assembled on a control panel (26) that is secured on a wall of the boiler housing (5), and a power supply and also the at least one electric heater (3) for the heat-carrying agent of the warming circuit, the temperature sensor (12) for the heat-carrying agent of the warming circuit, the temperature sensor (13) for the water in the container (1) of the hot water supply circuit, the flow control sensor (19) for the liquid heat-carrying agent of the warming circuit and the warming circuit pump (20) are coupled to the control panel (26).

12. The double-circuit electric boiler according to claim 6, characterized in that the boiler control elements are made in a form of an electronic system that comprises a controller (25), and this electronic system is assembled on a control panel (26) that is secured on a wall of the boiler housing (5), and a power supply and also the at least one electric heater (3) and the at least one additional electric heater (18) of the warming circuit for the heat-carrying agent of the warming circuit, the temperature sensor (12) for the heat-carrying agent of the warming circuit, the temperature sensor (13) for the water in the container (1) of the hot water supply circuit are coupled to the control panel (26).

13. The double-circuit electric boiler according to claim 8, characterized in that the boiler control elements are made in a form of an electronic system that comprises a controller (25), and this electronic system is assembled on a control panel (26) that is secured on a wall of the boiler housing (5), and a power supply and also the at least one electric heater (3) and at least one additional electric heater (18) of the warming circuit for the heat-carrying agent of the warming circuit, the temperature sensor (12) for the heat-carrying agent of the warming circuit, the temperature sensor (13) for the water in the container (1) of the hot water supply circuit, the flow control sensor (19) for the liquid heat-carrying agent of the warming circuit and the warming circuit pump (20) are coupled to the control panel (26).

14. The double-circuit electric boiler according to claim 2, characterized in that the at least one electric heater (27) for the water in the container (1) of the hot water supply circuit is mounted and secured to a flange (28) that is, in turn, mounted and sealably secured in the corresponding technological opening of one of the outer walls of the container (1) of the hot water supply circuit.

15. The double-circuit electric boiler according to claim 14, characterized in that the temperature sensor (13) for the water in the container (1) of the hot water supply circuit is mounted and secured to the flange (28) of the electric heater (27) for the water in the container (1) of the hot water supply circuit.

16. The double-circuit electric boiler according to claim 10 or claim 11 or claim 12 or claim 13 or claim 15, characterized in that the at least one electric heater (27) for the water in the container (1) of the hot water supply circuit is coupled to the control panel (26).

Description

BRIEF DESCRIPTION OF BLOCK DIAGRAMS OF THE PROPOSED INVENTION

[0106] Practical implementation and industrial applicability of the double-circuit electric boilers explained by schematic views of the structure, in which:

[0107] FIG. 1—the double-circuit electric boiler with the electric heater 3 of the warming circuit and the electric heater 27 of the hot water supply circuit, and with external elements and details;

[0108] FIG. 2—the double-circuit electric boiler with the electric heater 3 of the warming circuit and the electric heater 27 of the hot water supply circuit, and with external elements and details, as well as with the housing 5;

[0109] FIG. 3—the double-circuit electric boiler with the electric heater 3 of the warming circuit and the electric heater 27 of the hot water supply circuit, and with external elements and details (side view);

[0110] FIG. 4—the double-circuit electric boiler with the electric heater 3 of the warming circuit and the electric heater 27 of the hot water supply circuit without external elements and details (side view ¾, cross-section);

[0111] FIG. 5—the double-circuit electric boiler with the electric heater 3 of the warming circuit and the electric heater 27 of the hot water supply circuit without external elements and details (bottom view ¾);

[0112] FIG. 6—the double-circuit electric boiler with the electric heater 3 of the warming circuit (without the electric heater 27 of the hot water supply circuit), and with external elements and details;

[0113] FIG. 7—the double-circuit electric boiler with the electric heater 3 of the warming circuit (without the electric heater 27 of the hot water supply circuit), and with external elements and details, as well as with the housing 5;

[0114] FIG. 8—the double-circuit electric boiler with the electric heater 3 of the warming circuit (without the electric heater 27 of the hot water supply circuit), and with external elements and details (side view);

[0115] FIG. 9—the double-circuit electric boiler with the electric heater 3 of the warming circuit (without the electric heater 27 of the hot water supply circuit) without external elements and details (side view ¾, cross-section);

[0116] FIG. 10—the double-circuit electric boiler with the electric heater 3 of the warming circuit (without the electric heater 27 of the hot water supply circuit) without external elements and details (top view ¾, cross-section);

[0117] FIG. 11—the double-circuit electric boiler with the electric heater 3 of the warming circuit (without the electric heater 27 of the hot water supply circuit) without external elements and details (bottom view ¾);

[0118] FIG. 12—coupling of the outlet duct 8 to the container 2 of the warming circuit inside the container 1 of the double-circuit electric boiler.

[0119] Elements of the structure of both embodiments of the invention are designated with the following numeric positions: [0120] 1—the container for the water of the hot water supply circuit; [0121] 2—the container for the heat-carrying agent of the warming circuit; [0122] 3—the at least one electric heater of the heat-transfer of the warming circuit; [0123] 4—the heat insulation layer of the container 1 of the hot water supply circuit; [0124] 5—the housing of the boiler; [0125] 6—the inner walls of the container 2 of the heat-carrying agent of the warming circuit; [0126] 7—the outer wall of the container 2 of the heat-carrying agent of the warming circuit; [0127] 8—the outlet duct (for drain of the heat-carrying agent) from the container 2 of the warming circuit; [0128] 9—the inlet duct (for supply of the heat-carrying agent) into the container 2 of the warming circuit; [0129] 10—the outlet duct (for drain of the heated water) from the container 1 of the hot water supply circuit; [0130] 11—the inlet duct (for supply of a cold water) into the container 1 of the hot water supply circuit; [0131] 12—the temperature sensor for the heat-carrying agent in the container 2 of the warming circuit; [0132] 13—the temperature sensor for the water in the container 1 of the hot water supply circuit; [0133] 14—the heat exchange ribs of the container 2 of the warming circuit; [0134] 15—the outer wall 7 of the container 2, the wall being made in the form of a flange of the container 2 of the heat-carrying agent of the warming circuit; [0135] 16—mounting wall of the container 1 of the hot water supply circuit; [0136] 17—an additional flange of the electric heater 3 of the heat-carrying agent of the warming circuit; [0137] 18—additional electric heaters of the heat-carrying agent of the warming circuit; [0138] 19—the flow control sensor for the liquid heat-carrying agent of the warming circuit; [0139] 20—the warming circuit pump; [0140] 21—the safety valve of the warming circuit; [0141] 22—the outlet pipe of the warming circuit; [0142] 23—the expansion tank of the warming circuit; [0143] 24—a magnesium anode of the container 1 of the hot water supply circuit; [0144] 25—the controller; [0145] 26—the control panel; [0146] 27—the electric heater for the water of the hot water supply circuit; [0147] 28—the flange of the electric heater 27 for the water of the hot water supply circuit; [0148] 29—the inner surface of the outer wall 7 of the container 2 of the heat-carrying agent of the warming circuit; [0149] 30—the outer surface of the outer wall 7 of the container 2 of the heat-carrying agent of the warming circuit.

BEST EXAMPLES OF IMPLEMENTATION OF BOTH EMBODIMENTS OF THE INVENTION

Description of the Structure of the First Embodiment of the Invention

[0150] The structure of the first embodiment of the proposed double-circuit electric boiler comprises the following main constituent elements (FIG. 6-FIG. 12): the container 1 for the water of the hot water supply circuit (hereinafter briefly referred to as the HWS container 1) with the outer heat insulation layer 4 that is made in the form of a warming layer of any material that may be used in manufacturing such boilers; the container 2 for the heat-carrying agent of the warming circuit (hereinafter briefly referred to as the WC container 2) having inside the at least one electrical heater 3 of the heat-carrying agent of the warming circuit; a housing 5 (FIG. 6-8, FIG. 12), in which the HWS container 1, the WC container 2 and other components of the boiler are mounted; the power supply system and the boiler control elements. Therewith, the HWS container 1 comprises an outlet duct 10 (for drain of a heated water) and an inlet duct 11 (for feeding a cold water into the HWS container 1), while the WC container 2 comprises an inlet duct 8 (for drain of the heat-carrying agent) and the inlet duct 9 (for feeding the heat-carrying agent into the WC container 2).

[0151] The power supply system.

[0152] The double-circuit electric boiler is coupled to the mains at an input electric terminal that may be disposed inside the boiler housing 5. The electric principal diagram of the boiler implies a presence of a grounding circuit having a resistance of not more than 20 Ohm in a room, wherein the device is to be mounted.

[0153] The coupling may be made to a three-phase or single-phase mains depending on the heating power of the boiler.

[0154] The heating power of the double-circuit electric boiler is defined by a heating power of not more than one electric heater 3 (or as a sum of ratings of one electric heater 3 and several additional electric heaters 18) of the warming circuit and is in the range between 2 kW and 100 kW.

[0155] The electric power of the first embodiment of the double-circuit electric boiler is defined as a power of not more than one electric heater 3 (or as a sum of ratings of one electric heater 3 and several additional electric heaters 18) of the warming circuit. The electric heater 3 of the warming circuit is coupled by a separate individual conductor that is comprised in the double-circuit electric boiler.

[0156] As it has been already mentioned, in various design variants of both embodiments of the invention, the electric heater 3 of the warming circuit may be represented by several electric heaters (a cascade of heaters: the main electric heater 3 and the additional electric heaters 18, FIG. 6, 7, 9, 10, 11) that may allow to avoid imposing a load to the mains during use of the boiler.

[0157] The electric heater 3 of the warming circuit and the additional electric heaters 18 of the warming circuit (when they are comprised in the boiler) are controlled by the controller 25 (FIG. 2, 7).

[0158] The control elements of the boiler may include: on/off switches, power regulators of the electric heaters, fuses, the controller 25, a display and other standard devices and components, which enable to switch on, switch off the boiler and to control the operation thereof. Most of the boiler control elements are comprised in the control panel 26 (FIG. 2, 7) that may be disposed and secured on one of the housing 5 walls, but without limitation thereto. It should be noted that in the structure of both embodiments of the proposed double-circuit electric boiler, the “controller” is a customized component of the system that is formed from the control elements of the boiler, and this controller is intended to control certain components and devices of the boiler, which are coupled to the controller. Various known structures of controllers, which are used in the field of manufacturing and use of such devices, may be used in the structure of the proposed boiler. The controller 25 is intended to provide safety, control accuracy and programming the usage modes of the double-circuit electric boiler. In various variants and in separate embodiments of the boiler structure, various elements and members of the device may be coupled to the controller 25.

[0159] Each of the containers (the HWS container 1 and the WC container 2) is formed of metal walls and may have, e.g., a circular or a cylindrical shape, but without limitation thereto. The WC container 2 has a smaller size and a smaller volume than a size and a volume of the HWS container 1. According to the invention, the WC container 2, together with the at least one electric heater 3 of the heat-carrying agent of the warming circuit mounted therein, is mounted and sealably and rigidly secured inside the HWS container 1 (FIG. 6, 8, 9, 10, 12) such that there is totally no contact between the heat-carrying agent that is disposed inside the WC container 2 and the water that is disposed inside the HWS container 1, i.e. these liquids are isolated from each other by the inner walls 6 of the WC container 1 (FIG. 6, 8, 9, 10, 12). Due to such structural solution, it becomes possible to achieve a part of the technical effect, namely to combine two electric devices (the warming one and the water heating-water supply one) into a single device and, thus, to optimize and to reduce sizes and dimensions of the overall structure in order to save (reduce) an area for mounting and use of the device in domestic conditions. That is, as compared to the most of known technical solutions, the warming and the water-heating and water-supplying devices are separate and independent structures, each having its own dimensions and each occupying a certain area and a volume when mounted and during use. And, as it has been already mentioned, the structure of both embodiments of the proposed invention (according to the principle “two-in-one”) enables to optimize and to reduce the sizes and dimensions of the boiler for simultaneous warming and water-heating and water-supplying, as well as to save (reduce) the area for mounting and use of the device in domestic conditions.

[0160] As the electric heater 3 (or several electric heaters 3 and 18) of the heat-carrying agent of the warming circuit in the boiler structure, various types of the known electric heaters may be used, including: induction, tubular electric heaters or thermoelectric heaters, but without limitation thereto. The electric heater 3 of the liquid of the heat-carrying agent in the WC container 2 is intended to provide a smooth heating of the heat-carrying agent of the warming circuit (in order to avoid the overload of the mains). The at least one electric heater 3 of the heat-carrying agent of the warming circuit is coupled to the power supply system, is connected to the controller 25 and to the control panel 26.

[0161] The HWS container 1 comprises at least one mounting wall 16 (FIG. 6-12), and the WC container 2 also comprises at least one mounting wall that is one of surfaces of the WC container 2 and, at the same time, is the outer wall 7 (FIG. 6-12) that is disposed and secured outside the HWS container 1 such that the inner surface 29 (FIG. 8, 10, 12) of this outer wall 7 is in contact with the mounting wall 16 of the HWS container 1, while the outer surface 30 (FIG. 6, FIG. 8-12) of the outer wall 7 of the WC container 2 is located outside the HWS container 1. In the assembled and operational state of the boiler, when the WC container 2 is inserted and secured inside the HWS container 1, the outer surfaces of the inner walls 6 of the WC container 2 (that is disposed inside the HWS container 1) are disposed in a direct physical contact with the water of the hot water supply circuit inside the container 1. Therewith, the at least one electric heater 3 of the heat-carrying agent of the warming circuit is fully isolated by the inner walls 6 of the WC container 2 of the warming circuit from a direct physical contact with the water of the hot water supply circuit that is disposed inside the HWS container 1 (FIG. 6, 8, 9, 10, 12).

[0162] As it has been already mentioned, the WC container 2 comprises the outlet duct 8 and the inlet duct 9. The outlet duct 8 and the inlet duct 9 are sealably mounted and secured in the technological openings of the outer wall 7 and the WC container 2, while end openings of each of the ducts 8 and 9 are sealably connected to the corresponding technological openings of the WC container 2 inside the HWS container 1 (FIGS. 6-12). In the same way, the outlet duct 10 for drain of the water from the HWS container 1 and the inlet duct 11 for supplying the water into the HWS container 1 are sealably mounted and secured in the corresponding technological openings of one of the walls (in particular, in the mounting wall 16) of the HWS container 1 such that their end openings are disposed inside the HWS container 1 and areas of the outlet 10 and inlet 11 ducts, which are disposed inside the HWS container 1, are fully isolated by the inner walls 6 of the WC container 2 from a contact with the heat-carrying agent in the WC container 2 (FIG. 6-12).

[0163] Inside the WC container 2, there is mounted a temperature sensor 12 for the heat-carrying agent in the WC container 2 such that this temperature sensor 12 is fully isolated by the inner walls 6 of the WC container 2 from a contact with the water that is disposed in the HWS container 1 (FIG. 6, 7, FIG. 9-12). The temperature sensor 12 for the heat-carrying agent of the warming circuit in the WC container 2 is intended to fix values of the temperature of the heat-carrying agent (e.g., water) of the warming circuit inside the WC container 2. The temperature sensor 12 transmits signals to the controller 25.

[0164] Inside the HWS container 1, also there is mounted a temperature sensor 13 for the water in this HWS container 1 such that this temperature sensor 13 is fully isolated by the inner walls 6 of the WC container 2 from a contact with the heat-carrying agent in the HWS container 2 (FIGS. 6-11). The temperature sensor 13 for the water of the hot water supply circuit is intended to fix values of the temperature of the water of the hot water supply circuit inside the HWS container 1. The temperature sensor 13 transmits signals to the controller 25.

[0165] The structure of the proposed boiler may utilize both the temperature sensors 12 and 13, and any known structures of temperature sensors, which are used during manufacturing and use of such devices.

Description of the Structure of the Second Embodiment of the Invention

[0166] The structure of the second embodiment of the proposed double-circuit electric boiler comprises the same main constituent elements as the first embodiment, however, as opposed to the first embodiment, in the second embodiment of the invention, the at least one electric heater 27 for the water of the hot water supply circuit is mounted inside the HWS container 1 (FIG. 1-5). This electric heater 27 for the water of the hot water supply circuit is mounted and sealably secured in the corresponding technological opening of one of the walls (in particular, in the mounting wall 16) of the HWS container 1 such that the heating areas of the electric heater 27 are disposed inside the HWS container 1 and are fully isolated by the inner walls 6 of the WC container 2 from the contact with the heat-carrying agent in the WC container 2 (FIG. 1, 3, 4).

[0167] The electric heater 27 of the hot water supply circuit is coupled by a separate individual conductor that is comprised in the double-circuit electric boiler.

[0168] The electric heater 27 of the hot water supply circuit is controlled by the controller 25 (FIG. 2).

[0169] The electric power of the second embodiment of the double-circuit electric boiler is defined as a sum of the electric power of the at least one electric heater 3 of the warming circuit and the electric power of the electric heater 27 for the water of the hot water supply circuit, or as a sum of electric powers of one electric heater 3 of the warming circuit, several additional electric heaters 18 of the warming circuit and the electric heater 27 for the water of the hot water supply circuit.

[0170] Separate design variants of the two embodiments of the boiler structure.

[0171] In separate design variants of the invention, in the structure of both embodiments of the boiler, on the outer surfaces of the inner walls 6 of the WC container 2 the heat exchange ribs 14 may be disposed (FIG. 1, 3, 4, 6, 8, 9, 10, 12), which surfaces have a physical contact with the water inside the HWS container 1. The heat exchange ribs 14 are intended to enhance and to increase heat exchange processes between the WC container 2 that is heated by the heat-carrying agent of the warming circuit and the water that is heated inside the HWS container 1. Conversely, the heat exchange ribs 14 are also intended to enhance and to increase heat exchange processes between the heated water inside the HWS container 1 and the WC container 2 that, in turn, transfers the heat from the ribs 14 to the walls 6 and then to the heat-carrying agent inside the WC container 2.

[0172] Also, in separate design variants of the invention, in the structure of both embodiments of the boiler, the outer wall 7 of the WC container 2 may be made in the form of the flange 15 that is a bottom of the WC container 2 at the same time (FIGS. 1-12). In such cases, the flange 15 is coupled to the inner walls 6 in the lower portion of the WC container 2, wherein the outer wall 7 in the form of the flange 15 is configured to be sealably secured to one of the walls (in particular, to the mounting wall 16) of the HWS container 1.

[0173] Furthermore, in separate design variants of the invention, in the structure of both embodiments of the boiler, the at least one electric heater 3 of the heat-carrying agent of the warming circuit may be mounted and fixed to the additional flange 17 that, in turn, is mounted and sealably secured in the corresponding technological opening of the outer wall 7 of the WC container 2 (FIGS. 1-12). Or in other cases, the electric heater 3 of the heat-carrying agent of the warming circuit may be mounted and sealably secured in the corresponding technological opening of the outer wall 7 that is made in the form of the flange 15 that is the bottom of the WC container 2. Also, in various embodiments of the boiler structure, the temperature sensor 12 for the heat-carrying agent in the WC container 2 may be mounted and sealably fixed to the additional flange 17 of the electric heater 3.

[0174] In various design variants of each of the two embodiments of the invention (depending on the required heating power of the boiler), the structure may comprise one or more additional electric heaters 18 of the heat-carrying agent of the warming circuit, which is/are mounted and sealably secured in the corresponding technological opening of the outer wall 7 of the WC container 2 (FIG. 1, 4, 5, 6, 7, 9, 10, 11). Also, the one or more additional electric heaters 18 of the heat-carrying agent of the warming circuit may be mounted and fixed to the additional flange 17 that is, in turn, mounted and sealably secured in the corresponding technological opening of the outer wall 7 of the WC container 2 or in the technological opening of the outer wall 7 that is made in the form of the flange 15 that is the bottom of the WC container 2.

[0175] Each of the two embodiments of the invention, in various separate design variants and use cases of the structure, further comprises a so-called “pumping group” of members and elements, which are intended to enhance the circulation of the heat-carrying agent in the warming circuit of the system of the boiler and warming elements for the room (for example, pipes, radiators). That is, each of the embodiments of the boiler may further comprise: the flow control sensor 19 for the liquid heat-carrying agent of the warming circuit, the pump 20 of the warming circuit and the safety valve 21 of the warming circuit, which are mounted on the outlet pipe 22 of the warming circuit (FIG. 1, 2, 3— the second embodiment, FIG. 6, 7, 8— the first embodiment) that is, in turn, coupled to the outlet duct 8 for drain of the heat-carrying agent from the WC container 2. In such embodiments of the invention, the expansion tank 23 is coupled to the outlet pipe 22 of the warming circuit (FIG. 3, 2, 7, 8).

[0176] In both embodiments of the invention, a magnesium anode 24 may be mounted in the container 2 of the hot water supply circuit (FIG. 1, 4 in the second embodiment; FIG. 6, 8, 9, 10 in the second embodiment).

[0177] As it has been mentioned already, in both embodiments of the invention, the boiler control elements may be made in the form of the electronic system that comprises the controller 25, and this electronic system may be assembled on the control panel 26 that is secured on the wall of the boiler housing 5. The following may be coupled to the control panel 26: a power supply as well as at least one electric heater 3 of the heat-carrying agent of the warming circuit, the temperature sensor 12 for the heat-carrying agent of the warming circuit, the temperature sensor 13 for the water in the HWS container 1.

[0178] In cases, when the boiler comprises the “pumping group”, the boiler control elements may be made in the form of the electronic system that comprises the controller 25, and this electronic system is assembled on the control panel 26 that is secured on the wall of the boiler housing 5. And the power supply as well as the at least one electric heater 3 for the heat-carrying agent of the warming circuit, the temperature sensor 12 for the heat-carrying agent of the warming circuit, the temperature sensor 13 for the water in the container 1 of the hot water supply circuit, the flow control sensor 19 for the liquid heat-carrying agent of the warming circuit and the pump 20 of the warming circuit may be coupled to the control panel 26.

[0179] If one or more additional electrical heaters 18 of the warming circuit are mounted in the boiler (in the WC container 2) apart from the one electric heater 3 for the heat-carrying agent of the warming circuit, then these additional electric heaters 18 are also correspondingly coupled to the the control panel 26 and controlled by the controller 25.

[0180] In the second embodiment of the boiler structure, when the at least one electric heater 27 for the water of the hot water supply circuit is mounted in the HWS container 1, then this electric heater 27 for the water in the HWS container 1 may be mounted and secured to the flange 28 that is, in turn, mounted and sealably secured in the corresponding technological opening of one of the outer walls (in particular, in the mounting wall 16) of the HWS container 1. In the same way, the temperature sensor 13 for the water in the HWS container 1 may be also mounted to the flange 28 of the electric heater 27 for the water in the HWS container 1.

[0181] Also, in the second embodiment of the boiler structure, when the at least one electric heater 27 for the water of the hot water supply circuit is mounted in the boiler in the HWS container 1, then this electric heater 27 for the water in the HWS container 1 is coupled to the control panel 26 and controlled by the controller 25.

[0182] Both embodiments of the structure of the double-circuit electric boiler imply that

[0183] it comprises at least four ducts for hydraulic connections (couplings), namely, these are: the inlet duct 9 (for supply of the heat-carrying agent) into the container 2 of the warming circuit, the outlet duct 8 (for drain of the heat-carrying agent) from the container 2 of the warming circuit, the inlet duct 11 (for supply of the cold water) into the container 1 of the hot water supply circuit and the outlet duct 10 (for drain of the heated water) from the container 1 of the hot water supply circuit. Additionally, in separate design variants of the invention, each of the embodiments of the boiler may comprise a vent duct (not shown in the drawings) for discharge of the water from the HWS container 1.

[0184] The outlet duct 10 for drain of the heated water from the HWS container 1 into the HWS circuit is firmly mounted into the corresponding technological opening of the HWS container 1 (e.g., into the mounting wall 16 of the HWS container 1). The inlet duct 11 is also firmly mounted into the technological opening of the HWS container 1 (e.g., into the mounting wall 16 of the HWS container 1).

[0185] The inlet duct 9 for supply of the heat-carrying agent into the WC container 2 “at the input” of the HWS container 1 is firmly mounted into the technological opening of the outer wall 7 of the WC container 2, and then this duct (being already inside the HWS container 1) is coupled (via the corresponding technological opening) to the WC container 2. Thus, the walls of the inlet duct 9 of the warming circuit, which are disposed inside the HWS container 1, are in the contact with the water that is disposed inside the HWS container 1. In the same way, the outlet duct 8 for drain of the heat-carrying agent from the WC container 2 into the room warming system “at the output” from the HWS container 1 is firmly mounted into the technological opening of the outer wall 7 of the WC container 2, while inside the HWS container 1 this outlet duct 8 of the warming circuit is coupled (via the corresponding technological opening that is not shown in the drawings) to the WC container 2. Thus, the walls of the outlet duct 8 of the warming circuit, which are disposed inside the HWS container 1, are in the contact with the water that is disposed inside the HWS container 1.

[0186] Outside the boiler, the outlet duct 8 for supply of the heat-carrying agent is coupled to the pipe of the warming circuit, e.g., to the outlet pipe 22 of the warming circuit in such a way as shown in the FIGS. 1-3, 7-8.

[0187] Description of the Operation of Each of the Two Embodiments of the Double-Circuit Electric Boiler.

[0188] The boiler is intended to heat the heat-carrying agent for the room warming system (the warming circuit is the “HC”) with the simultaneous heating of the water for the hot water supply (the hot water supply circuit is the “HWS”) for domestic needs. That is, the boiler structure implies the presence of two systems of heating the heat-carrying agents.

[0189] The operation of the first embodiment of the proposed double-circuit electric boiler is based on a unidirectional heat exchange between the heat-carrying agent of the WC and the water of the HWS circuit through surfaces of the WC container 2 (with the heat-carrying agent being present inside it), which are disposed inside the HWS container 1 and which are in the direct contact with the water in the HWS container 1. That is, the heat transfer inside the boiler takes place from the heated heat-carrying agent in the WC container 2 through the surfaces of the WC container 2 to the water inside the HWS container 1.

[0190] The operation of the second embodiment of the proposed double-circuit electric boiler is based on a mutual bidirectional heat exchange between the heat-carrying agent of the WC and the water of the HWS circuit through surfaces of the WC container 2, which are disposed inside the HWS container 1 and which are in the direct contact with the water in the HWS container 1. That is, the heat transfer inside the boiler takes place from the heated heat-carrying agent in the WC container 2 through the surfaces of the WC container 2 to the water inside the HWS container 1, and conversely from the water inside the HWS container 1 to the outer surfaces of the WC container 2 and further to the heat-carrying agent inside the WC container 2.

[0191] The double-circuit electric boiler is mounted in the room. The structure of the boiler housing 5 enables to fix it on a vertical wall. As it has been already mentioned, due to the fact that the WC container 2 is disposed inside the HWS container 1 and both these containers 1 and 2 are disposed inside the housing 5, as compared to the analogous systems of warming and hot water supply, which are designed as separate structures, it is enabled to “save” (to reduce) sizes and volume areas for mounting and use of the device in the domestic conditions of living or other rooms. Such size and volume of the space for mounting and disposing the assembled boiler may constitute, e.g., 400 mm for the depth, not more than 900 mm for the height, not more than 500 for the width (for the HWS container 1 of 50 liters).

[0192] The double-circuit electric boiler is mounted in coupled to two main lines, namely, to a main water supply line (or to a water well) and to the mains.

[0193] The HWS container 1 is coupled to the main water supply line by means of the inlet duct 11, while the WC container 2 is coupled by means of the inlet duct 9, which are independent between each other. The coupling to pipes of the system for supplying domestic hot water from the HWS container 1 is made by means of the outlet duct 10. In order to supply the heat-carrying agent to the room warming system, the WC container 2 is coupled to the warming system by means of the outlet duct 8, as well as (in case of the presence of the “pumping group”) by means of the outlet pipe 22 of the warming circuit. Correspondingly, the outlet ducts 10 and 8 of the HWS container 1 and WC container 2 are independent from each other.

[0194] By means of the boiler control elements, e.g., by means of the control pane 26, the boiler is switched on. The HWS container 1 is filled with the water, the WC container 2 is also filled with the heat-carrying agent, e.g., water, and this heat-carrying agent being water fully enters to the system of the warming circuit, and the water from the HWS container 1 enters to the pipes of the circuit of the hot water supply system for domestic needs.

[0195] In the first embodiment of the boiler structure, by means of the at least one electric heater 3 of the heat-carrying agent of the warming circuit in the WC container 2, the water (heat-carrying agent) is successively heated, while it naturally (or by means of the “pumping group”) enters the pipes and the heat-carrying elements of the room warming system. During heating of the heat-carrying agent in the WC container 2 by the electric heater 3 the inner walls 6 of the WC container 2 are also heated by the already heated heat-carrying agent (e.g., by the heated water). Therewith, the water in the HWS container 1 is in the direct contact with the outer surfaces of the heated inner walls 6 of the WC container 2 and, thus, naturally this water in the HWS container 1 is successively heated as well, and after a certain time this water may be used for domestic needs of the hot water supply without significant losses of the heat energy for the warming system. That is, the following heating chain occurs: the electric heater 3 heats the heat-carrying agent being water inside the WC container 2, the heat-carrying agent being water heats the inner walls 6 of the WC container 2, the outer surfaces of the inner walls 6 of the WC container 2 heat the water in the HWS container 1. The heat insulation layer 4 of the HWS container 1 additionally maintains the temperature of the walls of the HWS container 1 and, thus, maintains the temperature for the warm water that is constantly heated in the HWS container 1. After drain from the HWS container 1 and use of a certain amount of the hot water for domestic needs, a non-heated water from the water supply line again enters the HWS container 1 along the inlet duct 11 (under the action of the water supply line pressure, under the pressure of about 3 bars), and the process of heating this water from the outer surfaces of the inner walls 6 of the WC container 2 occurs again.

[0196] Of course, during heating of the water in the HWS container 1, additional heat losses occur in the WC container 2 Therewith, the controller 25 receives signals from the temperature sensor 13 for the water in the HWS container 1 and from the temperature sensor 12 of the heat-carrying agent in the WC container 2, and in order to maintain a certain required temperature in the WC container 2, due to an algorithm installed in the software controller 25, the controller 25 “controls” the heating of the electric heater 3 (increases or reduces a level of its heating) and, thus, the controller 25 also indirectly “controls” the temperature of the heat-carrying agent of the warming circuit inside the WC container 2 and the temperature of the inner walls 6 of the WC container 2 and then it controls increase or reduction of the heating of the water inside the HWS container 1 from the inner walls 6. That is, during operation of the boiler, the temperature of the heat-carrying agent inside the WC container 2 and temperature of the water in the HWS container 1 may be automatically regulated “in the course of time” (depending on needs of consumers and on the operation algorithm of the controller 25).

[0197] In cases, when the controller 25 is absent in the structure of the boiler, then, e.g., by means of a traditional stationary power regulator of the electric heater 3, the required power is set manually and, thus, a certain required temperature of the heat-carrying agent in the WC container 2 and in the warming circuit system is achieved. In such cases, the water in the HWS container 1 is heated from the inner walls 6 of the WC container 2 in a successive, slow and less controlled manner than “under the guidance” of the controller 25. The rate of such heating of the water in the HWS container 1 depends at least: on the power of the electric heater 3 and additional electric heaters 18 (if they are present in the structure); on the overall outer area of the inner walls 6 of the WC container 2; on the inner volume in the HWS container 1; on the initial temperature of the water that enters the HWS container 1; on the environmental temperature (where the boiler is disposed). Therefore, without the automatic regulation of the power of the electric heater 3 by the controller 25, the heating of the water in the HWS container 1 may last longer than when the automatic mode is present. However, if the electric heater 3 constantly heats the heat-carrying agent in the WC container 2, in this case, the heating of the water in the HWS container 1 is also occurs constantly from the inner walls 6 of the WC container 2, while after expense of the hot water from the WC container 2 for the domestic needs, the heating of a “new” cold water is initiated once it has entered the HWS container 1.

[0198] Therefore, due to the heating chain created in the first embodiment of the boiler structure, wherein the electric heater 3 heats the heat-carrying agent being water inside the WC container 2, and the heat-carrying agent being water heats the inner walls 6 of the WC container 2, and then the outer surfaces of the inner walls 6 of the WC container 2 effectively heat the water in the HWS container 1, it becomes possible to achieve a portion of the technical effect, namely to reduce the heat losses at least by 10% and, as a consequence, to increase the heat efficiency of the double-circuit electric boiler by at least 10%. The reduction of the “heat losses by at least 10% and increase of the heat efficiency by at least 10%” is meant in comparison with separate devices (for warming and for water heating and water supplying), which are mounted and operate autonomously in a single room, and each of them has heat losses separately from each other, or in comparison with the invention prototype, when the WC container is not disposed inside the HWS container and most of the area of the walls of the WC container is not in a contact with the water in the HWS container, rather is in a contact with the environment.

[0199] In the second embodiment of the boiler structure, by means of the at least one electric heater 3 of the heat-carrying agent of the warming circuit in the WC container 2, the water (heat-carrying agent) is successively heated, while it naturally (or by means of the “pumping group”) enters the pipes and the heat-carrying elements of the room warming system. During heating of the heat-carrying agent in the WC container 2 by the electric heater 3 the inner walls 6 of the WC container 2 are also heated by the already heated heat-carrying agent (e.g., by the heated water). Therewith, the water in the HWS container 1 is in the direct contact with the outer surfaces of the heated inner walls 6 of the WC container 2 and, thus, naturally, this water in the HWS container 1 is also successively heated. Furthermore, the structure of the second embodiment of the boiler implies the presence of the electric heater 27 that is disposed in the HWS container 1 (in various design variants of the invention, the heater may be coupled to the controller 25 and to the control panel 26) and that further heats the water for the hot water supply circuit in the HWS container 1. That is, the heating of the water in the HWS container 1 is carried out simultaneously from the inner walls 6 of the WC container 2 and from the electric heater 27. After a certain time, this water from the HWS container 1 may be used for the domestic needs of the hot water supply without significant losses of the electric energy for the warming system. Furthermore, presence and operation of the electric heater 27 in the HWS container 1 enables: to heat the water for the domestic needs in the hot water supply circuit more rapidly; to reduce the heat expenses of the heat-carrying agent in the warming circuit; and to further mutually heat the inner walls 6 of the WC container 2, which, correspondingly, emit this heat to the heat-carrying agent of the warming circuit in the WC container 2. That is, during operation of the two electric heaters 3 and 27, there occurs a mutual heating and “heat balancing” of the liquid heat-carrying agents in the both WC and HWS containers. Therefore, during operation of the structure of the second embodiment of the boiler, the following two heating chains occurs therein. The first heating chain: the electric heater 3 heats the heat-carrying agent being water inside the WC container 2, the heat-carrying agent being water heats the inner walls 6 of the WC container 2, the outer surfaces of the inner walls 6 of the WC container 2 heat the water in the HWS container 1. The second heating chain: the electric heater 27 heats the heat-carrying agent being water inside the HWS container 1, this heated water partially transfers the heat energy to the outer surfaces of the inner walls 6 of the WC container 2, the inner surfaces of the inner walls 6 of the WC container 2 transfer the heat to the heat-carrying agent inside the WC container 2. Therefore, due to the mutual simultaneous heating of the heat-carrying agents, the system of two heat circuits elevates and “balances” the temperatures of two heat-carrying agents for the two independent circuits in a rather rapid and efficient manner. The heat insulation layer 4 of the HWS container 1 additionally maintains the temperature of the walls of the HWS container 1 and, thus, maintains the temperature for the hot water that is constantly heated in the HWS container 1. After drain from the HWS container 1 and use of a certain amount of the hot water for domestic needs, a non-heated water from the water supply line again enters the HWS container 1 along the inlet duct 11 (under the action of the water supply line pressure, under the pressure of about 3 bars), and the process of heating this water from the electric heater 27 and from the outer surfaces of the inner walls 6 of the WC container 2 occurs again.

[0200] Therefore, due to the two mutual heating chains created in the second embodiment of the structure of the boiler, it becomes possible to achieve a portion of the technical effect, namely, to reduce the heat losses by at least 10% and, as a consequence, to increase the heat efficiency of the double-circuit electric boiler by at least 10%. The reduction of the “heat losses by at least 10% and increase of the heat efficiency by at least 10%” is meant in comparison with separate devices (for warming and for water heating and water supplying), which are mounted and operate autonomously in a single room, and each of them has heat losses separately from each other, or in comparison with the invention prototype, when the WC container is not disposed inside the HWS container and most of the area of the walls of the WC container is not in a contact with the water in the HWS container, rather is in a contact with the environment.

[0201] Also, said structural solution of the second embodiment of the boiler (formation of two mutual heating chains) further enables to significantly increase the heating rate of the hot water in the hot water supply circuit for the domestic use as compared to separate devices for warming and for water heating and water supply, which are mounted and operate autonomously in a single room, do not have a physical contact between the walls of the containers and the heat-carrying agents, and, thus, are not able to “transfer” the heat energy mutually in order to speed up the heating of the heat-carrying agents.

[0202] The presence of the electric heater 27 in the second embodiment of the boiler structure also enables to use the boiler for maintaining the temperature of the heat-carrying agent in the warming circuit in case of a failure, replacement or repair of the electric heater 3 in the WC container 2. That is, if the electric heater 3 in the WC container 2 does not operate in case of certain circumstances or it is temporarily absent, then the operation of the electric heater 27 in the HWS container 1 and heating of the heat-carrying agent in the WC container 2 from the hot water in the HWS container 1 through the inner walls 6 of the WC container 2 enables to maintain the temperature in the entire warming circuit. Of course, such temperature may be lower than the one during operation of the electric heater 3 and, thus, in such cases, it is desirable to reduce the expenses of the hot water from the HWS container 1 for the domestic needs, however, the operation of the electric heater 27 in the HWS container 1 in such situations will enable to maintain the presence of the heat-carrying agent and a certain temperature in the room warming circuit prior to start of the operation of the electric heater 3 in the WC container 2 that is a rather considerable achievement upon implementation of this embodiment of the invention. Therefore, due to the presence and independence of the operation of the two electric heaters 3 and 27 in the second embodiment of the boiler structure and due to the two mutual heating chains formed in the second embodiment of the invention, it becomes possible to achieve a portion of the technical effect, namely, to enable the mutual heating of the heat-carrying agents in the containers of the two circuits between each other in case when the electric heaters does not operate in one of the circuits, and, as a consequence, to achieve a more stable overall operation of the double-circuit electric boiler, i.e., to increase the stability of heating of the hot water in both circuits, and, as a consequence, to achieve the increase of the stability of supplying the heat-carrying agent to the warming system and increase of the stability of supplying the hot water for the domestic use.

[0203] The second embodiment of the boiler structure is intended to operate in the mode, when both electric heaters 3 (WC) and 27 (of the HWS circuit) operate. In this mode, the electric heater 3 “aims” to heat the heat-carrying agent of the warming circuit to a value set by the consumer. It should be noted that the boiler control panel 26, in particular, the controller 25 (of both first and second embodiments), may be coupled to an external temperature sensor in the room, where the boiler is used. Depending on the temperature of the heat-carrying agent that is established (set) on the control panel 26, and depending on the readings of the external temperature sensor that is controlled by the consumer in a separate and independent manner—sets the required temperature in the room, and that is coupled to the controller 25 (the external temperature sensor is meant), as well as depending on the real temperature readings of the reverse (input) and output heat-carrying agent of the HC, a next heating level of the electric heater 3 is turned on or off in order to provide softness and neutralizing a load on the mains. This operation of the electric heater 3 does not depend on the amount of a “takeoff” (rate) of the hot water from the HWS container 1, however, the operation of the electric heater 3 depends on the overall temperature of the water in the HWS container—the lower this temperature is, the higher is the load and the heating of the electric heater 3, and vice versa. The structure of the second embodiment of the boiler during its operation implies achievement of the maximum temperature in the warming circuit of up to 60° C., and in the hot water supply circuit of up to 60° C. In order to optimize the costs for the electric energy and to provide a safe use of the device, the structure and the operation process of the second embodiment of the boiler are based on the following concept: Upon achievement of the temperature value of 60° C. in the HWS container 1, i.e. if within a long time (several hours) there is no drain (distribution) of the hot water (e.g., at night), the maximum temperature in the warming circuit reaches the value of 60° C. Therewith, the electric heater 27 in the HWS container 1 turns on for the operation (for heating) under the following condition:

the temperature inside the HWS container 1 is lower than the one given within the range of from 20° C. to 40° C., and the electric heater 27 turns off when the temperature is greater than 40° C. (the water in the HWS container 1 is “heated up” to the greater temperature by: the electric heater 3—the heat-carrying agent in the WC container 2, the outer walls 6 of the WC container 2);
the electric heater 27 in the HWS container 1 is turned off within a given daily time range, e.g., from 11 p.m. till 6 a.m. (as desired by the consumer), only the electric heater 3 in the WC container 2 operates, which walls 6 heat the water in the HWS container 1 during this long time.

[0204] The processes of turning on/off the electric heater 27 of the HWS container 1 as well as the electric heater 3 of the WC container 2 are automatically controlled by the programmed controller 25 or manually by the consumer.

[0205] Therefore, during operation of the second embodiment of the boiler, the heat-carrying agent in the warming circuit and the water in the hot water supply circuit is capable of being heated independently by the own electric heater. For example, this allows to use only the heating of the water in the HWS container 1 in the summer time with the electric heater 3 in the WC container 2 turned off. Also, when there is no need in the domestic hot water, the electric heater 3 in the WC container 2 operates independently and without use of the electric heater 27 in the HWS container 1 (e.g., when there is no people in the room for a long time and it is necessary to maintain only a minimum temperature in the warming circuit). Thus, in such use cases of the second embodiment of the structure of the boiler, it is enabled:

to reduce the % of electric energy costs for heating the liquids in the warming circuit and in the hot water supply circuit;
to achieve a possibility of the mutual heating of the heat-carrying agents in the containers of the both circuits between each other in case if the electric heater does not operate in one of the circuits and, as a consequence, to achieve a more stable overall operation of the double-circuit electric boiler.

[0206] Operation of the Additional Structural Elements of the Boiler.

[0207] In order to enhance the efficiency of the mutual heat exchange between the inner walls 6 of the WC container 2 and the water inside the HWS container 1, in both embodiments of the invention, the outer surfaces of the inner walls 6 of the WC container 2 may be provided with the heat exchange ribs 14, which significantly increase the outer heat exchange area of the surface of the WC container 2 and allow to increase the speed and efficiency of the mutual heat exchange between the inner walls 6 of the WC container 2 and the water inside the HWS container 1, thereby facilitating the achievement of the technical effect in terms of:

increase of the heat efficiency of the double-circuit electric boiler;
achievement of the mutual heating of the heat-carrying agents in the containers of both circuits between each other, if the electric heater does not operate in one of the circuits, increase of the heating stability of the hot water in both circuits, and increase of stability of supplying the heat-carrying agent to the warming system and increase of stability of supplying the hot water for the domestic use.

[0208] In both embodiments of the double-circuit electric boiler, the electric heater 3 for the heat-carrying agent of the warming circuit may be inserted and secured in the WC container 2 by means of the flange 15 (that is simultaneously is the outer wall 7 of the WC container 2) or by means of the additional flange 17 that is, in turn, mounted and sealably secured in the corresponding technological opening on the outer wall 7 of the container 2 of the heat-carrying agent of the warming circuit. Also, the electric heater 3 for the heat-carrying agent of the warming circuit may be inserted and secured in the WC container 2 by means of the additional flange 17 that is, in turn, mounted and sealably secured in the corresponding technological opening of the outer wall 7 that is made in the form of the flange 15 that is a bottom of the container 2 for the heat-carrying agent of the warming circuit. That is, the electric heater 3 may be fixed to the outer wall 7, which is shown in FIGS. 1-12 of the invention as the lower wall flange 15, and functionally is the outer wall 7 of the WC container 2. Attention should be paid to the fact that said FIGS. 1-12 show the attachment of the electric heater 3 exclusively through the additional flange 17, while attachment of “a direction” to the outer wall 7 (to the flange 15) is not shown, however, in practice such attachment may be used. As it has been mentioned, the electric heater 3 may be attached to the additional flange 17 (FIG. 1-12) that may be attached to one of the walls of the HWS container 1 (e.g., to the mounting wall 16 of the HWS container 1) without using the flange 15 (not shown in Figures) or “through” the flange 15 (FIG. 1-12) depending on the boiler structure in various separate cases.

[0209] The additional electric heaters 18 of the heat-carrying agent of the warming circuit also may be mounted and sealably secured in the corresponding technological opening of the outer wall 7 of the WC container 2 (also the additional electric heaters 18 may be attached to the flange 18 as well, if it represents the outer wall 7 of the WC container 2) or to the additional flange 17.

[0210] Use of the flange 15 and/or the additional flange 17 for attachment of the electric heater 3 (or several additional heaters 18 as well) in the WC container 2 allows to:

increase the reliability and density of attachment of the electric heater 3 in the WC container 2;
carry out rapid and convenient mounting/dismounting of the electric heater 3 (or several electric additional heaters 18 as well) from the WC container 2 (and from the entire boiler structure) in order to perform replacement, maintenance or repair of the electric heater 3 (or several additional electric heaters 18 as well).

[0211] The temperature sensor 12 for the heat-carrying agent in the WC container 2 also may be mounted and sealably attached to the additional flange 17 that also enables to carry out rapid and convenient mounting/dismounting of the temperature sensor 12 for the heat-carrying agent in the WC container 2 from the WC container 2 (and from the entire boiler structure) in order to perform replacement, maintenance or repair of the temperature sensor 12 for the heat-carrying agent in the WC container 2.

[0212] Use of various variants of mounting and securing of the electric heater 3, additional electric heaters 18 and temperature sensor 12 in the WC container 2 that is, in turn, mounted and secured in the HWS container 1, enables to improve the achievement of the technical effect in terms of achievement of a possibility of combining two devices (the warming one and the water heating and water supply one) into a single device and, in view of this, optimization and reduction of sizes and dimensions of the overall structure and reduction of a place for mounting and usage of the device in the domestic conditions.

[0213] In the second design and operation variant of the boiler, the at least one electric heater 27 for the water in the HWS container 1 and the temperature sensor 13 in the HWS container 1 may be mounted and attached to the flange 28 that is, in turn, mounted and sealably secured in the corresponding technological opening of one of the outer walls of the HWS container 1, e.g., in the mounting wall 16. Such a structural solution allows to carry out rapid and convenient mounting/dismounting of the electric heater 27 and the temperature sensor 13 from the WC container 2 (and from the entire boiler structure) in order to perform replacement, maintenance or repair of these temperature sensors 13 and the electric heater 27.

[0214] As it has been already mentioned, in separate design variants of both embodiments of the invention, the double-circuit electric boiler may be equipped with the “pumping group”, wherein the pump 20 “pumps” and forcefully supplies the heat-carrying agent from the WC container 2 to the pipeline of the room warming system. That is, the pump 20 is intended to provide an estimated flow of the liquid heat-carrying agent of the warming circuit through the WC container 2. The pump 20 may be controlled by the controller 25. At the “output” of the WC container 2, at the outlet pipe 22 of the warming circuit, prior to the pump 20, there is mounted the flow control sensor 19 for the liquid heat-carrying agent of the warming circuit that is intended to fix the boundary values of the flow of the liquid heat-carrying agent through the WC container 2. The flow control sensor 19 for the liquid transmits signals to the controller 25. After the pump 20, at the outlet pipe 22 of the warming circuit the safety valve 21 of the warming circuit is mounted, and the expansion tank 23 is attached to the outlet pipe 22 of the warming circuit, which are intended to provide overall operational safety of the warming circuit system. The ability of manual coupling of the “pumping group” to both embodiments of the proposed boiler enables to improve the overall usage of the device, as well as to improve and to enhance the achievement of the technical effects for both embodiments of the boiler.

[0215] The control elements of both embodiments of the boiler may be made in the form of an electronic system that may be based on use of the controller 25. All the required electric details of the boiler are coupled to this electronic system. Sensor or mechanical or other electric systems for controlling the boiler may be arranged on the control panel 26 that enables consumers to turn on, turn off, set and monitor the operation of the boiler. Convenient control elements for the boiler represent the required attribute in structures of modern warming and water heating and water supply devices, thus, presence and operation of elements, which are represented in the form of the electronic system that may be based on use of the controller 25 and which are arranged on the control panel 26, improve and enhance the achievement of the technical effects during operation of each of the proposed embodiments of the boiler.

INDUSTRIAL APPLICABILITY

[0216] The proposed double-circuit electric boiler has passed broad studies in the course of its experimental manufacture, as well as in the process of its usage in various rooms for warming these rooms and for heating the hot water for domestic needs.

[0217] Results of the studies has shown that the structure of the proposed invention allows to create at least two embodiments of the double-circuit electric boiler, each of them, during its usage, due to the set of all essential features, allows to achieve the technical effect during the simultaneous heating of the heat-carrying agent for the warming system and heating of the hot water for the domestic water supply.

[0218] Examples of a specific industrial implementation of the proposed embodiments of the invention, their use are mentioned above as the best exemplary implementations.

[0219] The proposed double-circuit electric boiler meets all the requirements of its usage, utilizing and all commonly accepted safety rules for usage of such devices for warming rooms and for boiling the hot water for domestic needs.