Arrangement Having Two Burners

Abstract

The invention relates to an arrangement (1) including two burners (10), which has a common exhaust gas guiding device (2) and a common supply device (3) for combustion air. A backflow barrier (4) blocks a flow of a gaseous medium in a flow direction and is arranged in the exhaust gas guiding device (2) or in the supply device (3). The backflow barrier (4) has an opening (40) and a movable element (41) which is movable between two positions. The opening (40) is open in case the movable element (41) is in one of the two positions and closed in case the movable element (41) is in another of the two positions.

Claims

1. An arrangement (1) including at least two burners (10), the arrangement (1) having an exhaust gas guiding device (2), the exhaust gas guiding device (2) serving to jointly guide exhaust gases of the two burners (10), the arrangement (1) having a supply device (3), the supply device (3) supplying the two burners (10) jointly with combustion air, the arrangement (1) having at least one backflow barrier (4), the backflow barrier (4) preventing a gaseous medium from flowing in at least one flow direction, the backflow barrier (4) being arranged in the exhaust gas guiding device (2) or in the supply device (3), the backflow barrier (4) having at least one opening (40) and at least one movable element (41), the movable element (41) being movable between at least two positions, the opening (40) being open in case the movable element (41) is in one of the two positions, and the opening (40) being closed in case the movable element (41) is in another of the two positions.

2. The arrangement (1) according to claim 1, the backflow barrier (4) being arranged in the exhaust gas guiding device (2), one exhaust gas guide extending from each of the two burners (10), one opening (40) being associated with each exhaust gas guide, the movable element (41) being a flap mounted in a decentralized manner or on one side between the two openings (40), and a position of the flap being dependent on a ratio of the exhaust gas quantities of the two burners (10).

3. The arrangement (1) according to claim 1, at least two backflow barriers (4) being provided.

4. The arrangement (1) according to claim 3, one of the two backflow barriers (4) being arranged in the exhaust gas guiding device (2), and another of the two backflow barriers (4) being arranged in the supply device (3).

5. The arrangement (1) according to claim 1, the supply device (3) having at least one blower device (30), and the backflow barrier (4) being arranged between the blower device (30) and one of the two burners (10).

6. The arrangement (1) according to claim 1, the supply device (3) having at least one blower device (30), and the blower device (30) being arranged between the backflow barrier (4) and one of the two burners (10).

7. The arrangement (1) according to claim 1, the movable element (41) being configured as a nozzle, a tip of the nozzle restricting the opening (40), the movable element (41) being at least partially elastic, and the movable element (41), in the event that a gaseous medium flows towards the movable element (41) from one direction, elastically deforms such that the opening (40) is released.

Description

[0036] In detail, there are a multitude of possibilities for designing and further developing the heating device according to the invention. To this end, reference is made, on the one hand, to the claims depending on claim 1, and, on the other hand, to the following description of exemplary configurations in conjunction with the drawing, in which:

[0037] FIG. 1 shows a schematic representation of a first configuration of an arrangement including a plurality of burners,

[0038] FIG. 2 shows a schematic representation of a second configuration of an arrangement including a plurality of burners,

[0039] FIG. 3 shows a section through a first configuration of a backflow barrier not according to the invention,

[0040] FIG. 4 shows a section through a second configuration of a backflow barrier not according to the invention,

[0041] FIG. 5 shows a section through a configuration of a backflow barrier according to the invention,

[0042] FIG. 6 shows a schematic representation of a third configuration of an arrangement including a plurality of burners,

[0043] FIG. 7 shows a section through a further configuration of a backflow barrier according to the invention in a first state,

[0044] FIG. 8 shows the configuration of FIG. 7 in a second state of the backflow barrier, and

[0045] FIG. 9 shows a schematic representation of a fourth configuration of an arrangement including a plurality of burners.

[0046] FIG. 1 schematically shows an arrangement 1 including two burners 10, each of which has its separate burner chamber.

[0047] The burners 10 each receive their combustion air via a supply device 3, which has a single combustion air supply 31. The combustion air is supplied to the burners 10 via a respective blower device 30. The exhaust gases of the two burners 10 are discharged via a common exhaust gas guiding device 2 after having left the burner 10 via a separate exhaust gas outlet. Thus, the combustion air inlets of the two burners 10 are coupled to each other, and the exhaust gas outlets of the two burners 10 are coupled to each other.

[0048] In case only one of the two burners 10 is operated, there is a risk that exhaust gases from the one burner 10 enter the non-operated burner 10 and from there enter the section of the supply device 3 associated with the non-operated burner 10. In the configuration shown, the exhaust gases are primarily prevented from entering the blower devices 30. This is done here by arranging a respective backflow barrier 4 between a blower device (alternative designation: combustion air blower) 30 and the associated burner 10.

[0049] A gaseous medium can flow through the backflow barriers 4 only in the direction of passage (indicated by the drawn arrows) and thus in the direction of the burners 10. In the opposite direction, the backflow barriers 4 close the path and thus also particularly prevent exhaust gases (as a gaseous medium) from entering the blower devices 30.

[0050] In the variant of FIG. 2, the backflow barriers 4 are located upstream the blower devices 30 with respect to the combustion air and are therefore arranged further in the direction of the combustion air supply 31. This configuration allows, for example, the two blower devices 30 and the combustion air supply 31 to be designed as a common component. It is thus possible to simplify the manufacturing.

[0051] In alternative configurations, backflow barriers 4 are arranged at different positions of the supply device 3.

[0052] The following configurations refer to exemplary configurations of the backflow barriers 4 themselves. In most cases, an opening 40 is provided which can be closed or released by a movable element 41.

[0053] FIG. 3 shows a backflow barrier 4 not according to the invention, having an elastically movable diaphragm as a movable element 41. The diaphragm 41 is mounted centrally—here via a screw. The—here radially circumferential—edge of the diaphragm 41 rests—in the resting state—on a circumferential mounting point 42 in the illustrated configuration as the upper end face border of the opening 40.

[0054] If the gaseous medium flows in the desired direction—here drawn from the bottom to the top—the edge of the diaphragm 41 lifts off and a passage for the gaseous medium is generated between the diaphragm 41 and the surrounding mounting point 42 as a support. The opening 40 is thus open.

[0055] However, if a gaseous medium—e.g. the exhaust gas from the combustion of that burner to which the backflow barrier 4 is not assigned—presses against the diaphragm 41 from the top, the edge of the diaphragm 41 returns to its rest position and closes the opening 40. The same applies if no medium acts. This is generated due to the gravity and/or the design of the shape of the diaphragm 41.

[0056] FIG. 4 shows a configuration not according to the invention with a movable element 41, which is designed here as a disk and serves as a floating body.

[0057] If the gaseous medium presses against the disk 41 from below, the opening 40 is open and the medium can pass. To release the opening 40, the movable element 41 must be designed to be correspondingly light so as to be adapted to be lifted by a gaseous medium. For the fixing and also a reliable mounting, a plurality of (preferably at least three) clamping hooks are provided in the configuration shown, to prevent lateral movement of the movable element 41 and to restrict axial movement in the upward direction. As an alternative to the clamping hooks, a circumferential edge is provided.

[0058] In the state without a medium flowing in from below, the movable element 41 falls back into the mounting point 42 as a result of the force of gravity, and closes the opening 40. The same applies if a gaseous medium acts against the movable element 41 against the desired flow direction and thus in the blocking direction.

[0059] FIG. 5 shows a movable element 41 which is designed in the form of a nozzle and is elastic. The opening 40 is restricted by the upper tip of the nozzle 41. If the gaseous medium presses against the tip of the nozzle 41 from below, the material expands and the opening 40 is released. Without the inflow from this direction, the tip preferably closes by itself, as shown here. Furthermore, if a gaseous medium presses against the upper end face of the movable element 41 from above, the tip and thus the opening 40 is also closed.

[0060] Thus, the mobility of the movable element 41 refers either to the mobility with respect to the position and/or the geometry and the change between different geometric states of the element 41.

[0061] FIG. 6 shows a similar configuration of the arrangement 1 as FIG. 2. On the one hand, here only one backflow barrier 4 is present in the supply device 3 and is associated with only one burner 10. On the other hand, a backflow barrier 4 is additionally present in the exhaust gas guiding device 2 and is assigned to both burners 10. The exhaust gas guiding device 2 is designed here such that an exhaust gas guide extends from each burner 10 and such that the individual exhaust gas guides are combined to a common exhaust gas guide, e.g. a pipe or other conduit. Alternatively, a backflow barrier 4 is present only in the exhaust gas guiding device 2.

[0062] The backflow barrier 4 in the common exhaust gas guiding device 2 is designed here as a flap mounted on one side. It blocks the path of exhaust gases from an operated burner 10 to a non-operated burner 10.

[0063] FIG. 7 shows the case where only the right burner and not the left burner (cf. FIG. 6) is operated.

[0064] The exhaust gas of the right burner presses the movable element 41, which is mounted on one side, in the direction of the non-operated burner, which is arranged on the left in this case. Due to the arrangement and design of the movable element 41, which is in the form of a flap, the opening 40 of the left side of the piping system is thus closed, and the exhaust gas cannot reach the other burner. If the left burner and not the right burner were operated, the flap 41 would close the opposite opening 40.

[0065] If both burners are operated, the flap 41 assumes a center position, preventing backflow insofar as both combustion air blowers generate sufficient backpressure.

[0066] FIG. 8 shows the case where the left burner is operated at a higher output than the right burner (cf. FIG. 6). Thus, for example, more exhaust gas is produced by the left burner than by the right burner (indicated here by the arrows). Therefore, the flap 41 assumes a tilted position according to the ratio between the exhaust gas quantities, so that again for the burner with the lower output rate, the opening is closed to a greater extent. The back pressure against the exhaust gases, which is respectively generated by the combustion air blowers, prevents the exhaust gas from the burner having the greater output from entering the other burner at the rear.

[0067] FIG. 9 shows a configuration which can be implemented as an alternative or in addition to the previous variants.

[0068] The arrangement 1 has two backflow barriers 4, which may be present additionally or alternatively to the mechanical backflow barriers 4 of the above-discussed configurations and which are provided by the blower devices 30 themselves—preferably in connection with the type of control thereof.

[0069] This type of backflow barrier 4 consists in that the blower device 30 supplies combustion air to a burner 10 even if the burner 10 is not active, i.e. when no combustion takes place. Thus, the inactive or non-operated burners 10 are flushed with combustion air. Preferably, the amount of combustion air is such that exhaust gas from the active burner is just prevented from entering the inactive burner. In one configuration, a temperature is measured which provides information on whether exhaust gases have entered the area of the non-operated burner between the common exhaust gas guiding device 2 and the supply device 3. If the temperature rises above a tolerable limit, the speed of the blower device 30 associated with the non-operated burner 10 is increased, for example, to purge the non-operated burner 10 with more combustion air and thus counteract the exhaust gases.

LIST OF REFERENCE NUMERALS

[0070] 1 arrangement [0071] 2 exhaust gas guiding device [0072] 3 supply device [0073] 4 backflow barrier [0074] 10 burner [0075] 30 blower device [0076] 31 combustion air supply [0077] 40 opening of the backflow barrier [0078] 41 movable element of the backflow barrier [0079] 42 mounting point of the backflow barrier