Dual venturi for combustor

Abstract

The present invention relates to a dual venturi for a combustor and, specifically, to a dual venturi for a combustor, which adjusts the amount of gas and air supplied to a burner of a hot water heater and has a motor combined with a damper in order to increase a turn-down ratio (TDR), such that the damper is rotated by the driving of the motor so as to simultaneously open or close secondary air and gas inlets, thereby enabling efficient heating control. The present invention has a separate opening/closing means which is capable of controlling, in two stages, the amount of air and gas flowing into the combustor such as the hot water heater, wherein the opening/closing means comprises the motor and the damper, and the damper is rotated by the driving of the motor so as to simultaneously open or close the secondary air and gas inlets, thereby enabling the control of the amount of air and gas.

Claims

1. A dual venturi for a combustor, comprising: a housing; an air supply unit within the housing, the air supply unit comprising a first air supply unit and a second air supply unit separated from the first air supply unit by a first partition, the first partition formed with an opening/closing hole; a gas supply unit formed on one side of the housing, the gas supply unit comprising a first gas supply unit and a second gas supply unit separated from the first air supply unit by a second partition, the first gas supply unit connected to the first air supply unit, the second gas supply unit connected to the second air supply unit through the opening/closing hole; a damper rotatably disposed in the second air supply unit and configured to allow or block air flowing through the second air supply unit, the damper having a hollow cylindrical portion disposed within the second air supply unit, two or more first protrusions and first recesses which are relatively recessed with respect to the first protrusions alternatively disposed in the hollow cylindrical portion; a moving body disposed in the hollow cylindrical portion, the moving body having second protrusions and second recesses that are respectively corresponding to the first protrusions and the first recesses and configured to, according to rotation of the damper, move in a first direction by contact of ends of the second protrusions with ends of the first protrusions and move in a second direction by ends of the second protrusions being disposed in the first recesses within the hollow cylindrical portion; a valve connected to the moving body, the valve configured to allow flow of gas through the second gas supply unit into the second air supply unit by opening the opening/closing hole while simultaneously moving as the moving body moves in the first direction or block flow of gas flowing through the second gas supply unit into the second air supply unit by closing the opening/closing hole while simultaneously moving as the moving body moves in the second direction; and a first spring disposed within the hollow cylindrical portion and connected to the moving body, and configured to provide a return force to the moving body in the second direction.

2. The dual venturi of claim 1, further comprising: a second spring disposed in the first partition and connected to the valve and configured to provide a return force to the valve in the second direction.

3. The dual venturi of claim 1, wherein the valve further comprises a sealing member to maintain airtightness between the opening/closing hole and the valve.

4. The dual venturi of claim 1, wherein when the opening/closing hole is open by a motion of the moving body in the first direction, the opening/closing hole is positioned between the moving body and the valve.

5. The dual venturi of claim 1, wherein the first air supply unit and the second air supply unit each further comprise a removable internal housing for load adjustment on an inner side of the first air supply unit and an inner side of the second air supply unit, which can control an amount of air according to a heat capacity load required for combustion and is able to adjust a turn down ratio by the heat capacity load required form the combustion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a drawing showing the prior art.

(2) FIG. 2 is a perspective view showing the dual venturi for a combustor according to the present invention.

(3) FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2.

(4) FIG. 4 is a perspective view showing the interior of the gas supply unit provided in FIG. 2.

(5) FIG. 5a is a perspective view showing the interior of the damper provided in FIG. 3 and FIG. 5b is a perspective view showing the moving body.

(6) FIG. 6 is a drawing explaining the operating state of the dual venturi for a combustor according to the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(7) Hereinafter, preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiment of the present invention can be modified into various forms, and it should be understood that the scope of present invention is not limited to the embodiments whose detailed description is provided below. The following embodiments are given to provide a more detailed description of the preset invention to those skilled in the art. Therefore, shapes of the elements, etc. may be exaggerated in the drawings for a clearer understanding of the description. Identical or corresponding elements in each drawing may be designated with same reference signs. In addition, description of known functions or configurations determined to hinder understanding of the present invention are omitted.

(8) Hereafter, an exemplary embodiment of the dual venturi for a combustor of the present invention will be described in detail with reference to the accompanying drawings.

(9) In the accompanying drawings, FIG. 2 is a perspective view showing the dual venturi for a combustor according to the present invention, FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2, FIG. 4 is a perspective view showing the interior of the gas supply unit provided in FIG. 2, FIG. 5a is a perspective view showing the interior of the damper provided in FIG. 3, FIG. 5b is a perspective view showing the moving body, and FIG. 6 is a drawing explaining the operating state of the dual venturi for a combustor according to the present invention.

(10) Referring to FIG. 2 to FIG. 6, the dual venturi for a combustor of the present invention is provided with a housing (500) having a predetermined space in the inner side thereof through which air and gas can flow and an outlet (300) connected to a fan (not shown) on one side.

(11) An air supply unit (100) is formed on the inner side of the housing (500) and divided by a first partition (130) into a first air supply unit (110) and a second air supply unit (120).

(12) Meanwhile, as shown in FIG. 3 and FIG. 4, a gas supply unit (610) is formed on one side of the housing (500) and divided by a second partition (613), in which a first gas supply unit (611) is connected to the first air supply unit (110), and a second gas supply unit (612) is connected to the second air supply unit (120) by an opening/closing hole (121). Therefore, there is no need to separately establish the conventional first and second gas flow paths since the gas supply unit (610) is integrally formed and the first and second gases are completely separated by the second partition (613).

(13) Further, a gas inlet (600) is formed on the side of the gas supply unit (610) such that the first gas and the second gas can flow in simultaneously, in which the first gas inlet (601) is formed on the first gas supply unit (611) side and the second gas inlet (602) is formed on the second gas supply unit (612).

(14) On the other hand, an opening/closing means (400) is coupled to the middle of the second air supply unit (120). The opening/closing means (400) can control the heat capacity according to the heat capacity load required by the combustor by blocking the flow of air and gas flowing through the second air supply unit (120) and the second gas supply unit (612) while opening the second air supply unit (120) and the second gas supply unit (612) when high heat capacity is needed.

(15) Further describing the opening/closing means (400) with reference to FIG. 3 to FIG. 6, the opening/closing means (400) is provided with an opening/closing unit (420) in the middle of the second air supply unit (120) to block or allow flow of air and gas flowing through the second air supply unit (120) and the second gas supply unit (612) by a damper (430) that is rotated by the operation of a motor (410).

(16) The opening/closing unit (420) is provided with a damper (430) connected to a motor shaft (411) of the motor (410) through a shaft hole (431) provided in its center, with two or more protrusions (432) at the edge of the shaft hole (431) and recesses (433) which are relatively recessed with respect to the protrusions (432) alternatively formed thereon.

(17) Further, the opening/closing unit (420) is equipped with a moving body (440) having protrusions (442) and recesses (443) corresponding to the protrusions (432) and recesses (433) of the damper (430) such that the ends of each protrusion (432, 442) comes into contact with each other by the rotation of the damper (430), to move forward and in reverse.

(18) Meanwhile, a valve (444) is connected to one end of the moving body (440) to allow flow of or block the air or gas flowing through the second air supply unit (120) and the second gas supply unit (612) by opening and closing the opening/closing hole (121) according to the forward/reverse motion of the moving body (440).

(19) In addition, a first spring (451) is provided between the damper (430) and the moving body (440) to provide elastic force for support and a return force for when the valve (444) closes the opening/closing hole (121) after opening it.

(20) On the other hand, a second spring (452) is interposed between the first partition (130) and the moving body (440) to rapidly return the moving body (440) when the opening/closing hole (121) is closed by the moving body (440) returning to the damper (430) side via the rotation of the damper (430).

(21) Also, the valve (444) can further comprise a sealing member (445) to maintain airtightness between the opening/closing hole (121) and the valve (444). Therefore, the second gas supply can be completely blocked during low heat capacity operation of the combustor.

(22) The first air supply unit (110) and the second air supply unit (120) can each further comprise a removable internal housing (112, 122) for load adjustment on the inner side, which can control the amount of air according to the heat capacity load required for combustion. Thus, the internal housing (112, 122) which is formed in various volumes according to the heat capacity load is configured to be removable.

(23) Accordingly, when producing a combustor with small capacity, the combustor can be used by just replacing the internal housing (112, 122) of a small volume, that is needed for the combustor, on the inner side of the first air supply unit (110) and the second air supply unit (120) without designing a separate dual venturi, thereby increasing economic feasibility.

(24) Hereafter, operating state of the dual venturi for a combustor of the present invention configured as above will be described in detail.

(25) As illustrated in FIG. 3, in regards to supplying only the first gas and the first air in the hot water heater, the second air supply unit (120) is closed by the damper (430) of the opening/closing unit (420) rotating horizontally to the flow direction of the air and gas of the second air supply unit (120), and at the same time the recess (443) of the moving body (440) and the protrusion (432) of the damper (430), as well as the protrusion (442) of the moving body (440) and the recess (433) of the damper (430) are kept in contact with each other. At this time, inflow of the second gas is blocked since the valve (444) of the moving body (440) is blocking the opening/closing hole (121), and the inflow of the second air is blocked since the damper (430) is rotated to be horizontal to the second air supply unit (120). Here, the first and second gases flow simultaneously into the gas inlet (600), but the valve (444) blocks the opening/closing hole (121) formed on the second air supply unit (120), thus the inflow of second gas is also blocked.

(26) Therefore, since the mixture of air and gas mixed together flows into the fan only through the first gas supply unit (611) and the first air supply unit (110), the combustor can be operated with low heat capacity.

(27) On the other hand, in order to drive the combustor with high heat capacity, power must be applied to the motor (410) to rotate the damper (430) by 90 degrees so that the damper (430) rotates to be in the same direction as the lengthwise direction of the second air supply unit (120), as shown in FIG. 6.

(28) The protrusions (432) and recesses (433) formed inside the damper (430) rotate at the same time as the damper (430) rotation, resulting in respective protrusions (432, 442) (ends) of the damper (430) and moving body (440) to be in contact with each other, thereby the moving body (440) is pushed by the rotation of the damper (430) to move forward.

(29) Here, the second gas flowing through the second gas supply unit (612) flows into the opening/closing hole (121) when the valve (444) coupled to the rear part of the moving body (440) moves away from the sealing member (445), and the second gas is mixed with the second air flowing in through the second air supply unit (120). This is then mixed with the air and gas flowing through the first air supply unit (110) and the first gas supply unit (611) to produce even more mixture, which then flows to the fan to operate the combustor with high heat capacity. Here, the first spring (451) is interposed between the damper (430) and the moving body (440), thus respective protrusions (432, 442) can maintain contact with each other by the elastic force of the first spring

(30) In order to operate the combustor with low heat capacity later on, the motor (410) is operated to rotate the damper (430) by 90 degrees again, which results in the state as shown in FIG. 3, and the second air supply unit (120) and opening/closing hole (121) are closed to operate the combustor with low heat capacity. Here, the second spring (452) is interposed between the first partition (130) and the moving body (440). Thus, return force is increased so that each protrusion (432, 442) and recess (433, 443) of the moving body (440) and the damper (430) can respectively be engaged when the damper (430) rotates to close the second air supply unit (120).

(31) The above description relating to a preferred embodiment of a dual venturi for a combustor according to the present invention is merely an example. It will be understood by the skilled person in the art that various modifications and other similar embodiments based on the description provided can be made. Therefore, it is clear that the present invention is not limited to the preferred embodiment described above. Accordingly, the scope of the invention to be protected must be based on the technical principles of the accompanying claims. Further, it must be understood that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

REFERENCE SIGNS

(32) 100: Air Supply Unit 110: First Air Supply Unit 112: Internal Housing 120: Second Air Supply Unit 121: Opening/Closing Hole 122: Internal Housing 130: First Partition 300: Outlet 400: Opening/Closing Means 410: Motor 411: Motor Shaft 420: Opening/Closing Unit 430: Damper 430: Shaft Hole 432: Protrusion 433: Recess 440: Moving Body 442: Protrusion 443: Recess 444: Valve 451: First Spring 452: Second Spring 500: Housing 600: Gas Inlet 601: First Gas Inlet 602: Second Gas Inlet 610: Gas Supply Unit 611: First Gas Supply Unit 612: Second Gas Supply Unit 613: Second Partition