CN111692588A

CN111692588A - Premixing cavity for gas combustion equipment, burner assembly and gas combustion equipment

Info

Publication number: CN111692588A
Application number: CN201910195011.2A
Authority: CN
Inventors: 寿利萍; 李为臻; 梁泽锋; 张景才; 黄官贤; 梁国荣
Original assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2019-03-14
Filing date: 2019-03-14
Publication date: 2020-09-22

Abstract

The invention discloses a premixing cavity for gas combustion equipment, a burner assembly and the gas combustion equipment. The premix chamber includes: a cavity having an inlet side and an outlet side; the air distribution plate is arranged in the cavity and separates the air inlet side from the air outlet side, so that air and fuel gas entering the cavity from the air inlet side are discharged from the air outlet side after passing through the air distribution plate, wherein the air distribution plate is used for mixing the fuel gas and the air. The premixing cavity for the gas combustion equipment can realize premixing of air and gas, and the air distribution plate can mix the air and the gas again, so that the mixing uniformity of the air and the gas is improved, the combustibility of the air-gas mixture is improved, and the air-gas mixture can be fully combusted in a combustion stage.

Description

Premixing cavity for gas combustion equipment, burner assembly and gas combustion equipment

Technical Field

The invention relates to the technical field of water heaters, in particular to a premixing cavity for gas combustion equipment, a burner assembly and the gas combustion equipment.

Background

The premixing cavity is an important part of the gas water heater, the premixing cavity is used for mixing air and gas, the mixing uniformity of the premixing cavity influences the combustion effect of a follow-up combustor, and the air and the gas are not mixed uniformly enough for the existing premixing cavity.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, the invention provides a premixing cavity for gas combustion equipment, and air and gas are uniformly mixed.

The invention also provides a burner assembly with the premixing cavity for the gas combustion equipment.

The invention also provides gas combustion equipment with the burner assembly.

The premixing chamber for a gas combustion apparatus according to an embodiment of the present invention includes: a cavity having an inlet side and an outlet side; the air distribution plate is arranged in the cavity and separates the air inlet side from the air outlet side, so that air and fuel gas entering the cavity from the air inlet side are discharged from the air outlet side after passing through the air distribution plate, wherein the air distribution plate is used for mixing the fuel gas and the air.

The premixing cavity for the gas combustion equipment can realize premixing of air and gas, and the air distribution plate can mix the air and the gas again, so that the mixing uniformity of the air and the gas is improved, the combustibility of the air-gas mixture is improved, and the air-gas mixture can be fully combusted in a combustion stage.

According to some embodiments of the invention, the grid plate is a multi-stage grid plate, the grid plate being spaced apart within the cavity.

According to some embodiments of the invention, the grid plate is a multi-stage grid plate, the grid plate being spaced apart within the cavity, the multi-stage grid plate comprising: the air distribution plate comprises a first-stage air distribution plate and a second-stage air distribution plate, wherein the first-stage air distribution plate is close to the air inlet side, and the second-stage air distribution plate is close to the air outlet side.

Specifically, the first-level air distribution plate is provided with a shunting guide structure, and the shunting guide structure is used for shunting and guiding the air and the fuel gas entering the cavity from the air inlet side.

Further, the cavity includes: the gas-water separator comprises a cavity body and an inlet part, wherein the inlet part is arranged on the cavity body, the inlet part is constructed to be at the gas inlet side, and the inlet part is provided with an air inlet and a fuel gas inlet.

Further, the air inlet is opposite to the flow dividing guide structure.

Specifically, the inlet part is located at the bottom of the cavity body, the air inlet is located at the bottom surface of the inlet part, the gas inlet is located on the outer wall of the inlet part, and the air inlet and the gas inlet are perpendicular.

According to some embodiments of the invention, the primary air distribution plate comprises: the first section and the second section are positioned on two sides of the flow dividing guide structure, and the flow dividing guide structure is opposite to the first section and the second section and protrudes towards the air inlet side.

Specifically, the shunt guide structure includes: the first inclined plane section is connected with the first section, and the second inclined plane section is connected with the second section.

Furthermore, a windward section is arranged between the first inclined plane section and the second inclined plane section, the angle between the first inclined plane section and the first section is 15-75 degrees, and the angle between the second inclined plane section and the second section is 15-75 degrees.

Specifically, the cavity includes: the cavity body, the diapire of cavity body be formed with first slope diapire that first section corresponds, first slope diapire with the incline direction of first inclined plane section is the same, the diapire of cavity body be formed with the second slope diapire that the second section corresponds, the second slope diapire with the incline direction of second inclined plane section is the same.

According to some embodiments of the present invention, the flow dividing guide structure, the first section and the second section are provided with a primary air distribution small hole, and the first section and the second section are further provided with a primary air distribution large hole.

According to some embodiments of the invention, the first section and the second section are in the same plane and parallel to the secondary air distribution plate.

According to some embodiments of the invention, the secondary air distribution plate is provided with secondary air distribution holes.

According to some embodiments of the invention, the top of the cavity is further provided with an annular flange adapted to support a stationary burner.

The burner assembly according to the second aspect of the embodiment of the invention comprises a burner and the premixing cavity for the gas combustion device, wherein the burner is arranged on the gas outlet side of the premixing cavity, so that the air-gas mixture flowing out from the gas outlet side is combusted at the burner.

The burner is a preheat burner or a flameless catalytic burner.

A gas combustion device according to an embodiment of the third aspect of the invention comprises the burner assembly described above.

Drawings

FIG. 1 is a front view of a premix chamber for a gas combustion apparatus;

FIG. 2 is a top view of a premix chamber for a gas combustion apparatus;

FIG. 3 is a sectional view A-A of FIG. 2;

FIG. 4 is a bottom view of a premix chamber for a gas combustion apparatus;

FIG. 5 is a right side view of a premix chamber for a gas combustion apparatus.

Reference numerals:

the premixing cavity 6, the cavity 61, the air inlet side (inlet portion) 611, the air inlet 6111, the fuel gas inlet 6112, the air outlet side 612, the cavity body 613, the first inclined bottom wall 6131, the second inclined bottom wall 6132, the outward flange 614, the air distribution plate 6230, the primary air distribution plate 62, the flow dividing guide structure 621, the first inclined surface segment 6211, the second inclined surface segment 6212, the windward surface segment 6213, the first segment 622, the second segment 623, the primary air distribution small hole 624, the secondary air distribution plate 63 and the secondary air distribution hole 631.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The premix chamber 6 for a gas combustion apparatus according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 5.

Referring to fig. 1 to 3, a premix chamber 6 for a gas combustion apparatus according to an embodiment of the present invention may include: the gas distribution device comprises a cavity 61 and a gas distribution plate 6230, wherein the cavity 61 is provided with an air inlet side 611 and an air outlet side 612, the gas distribution plate 6230 is arranged in the cavity 61, the gas distribution plate 6230 separates the air inlet side 611 and the air outlet side 612, and therefore air and fuel gas entering the cavity 61 from the air inlet side 611 are discharged from the air outlet side 612 after passing through the gas distribution plate 6230, and the gas distribution plate 6230 is used for mixing the fuel gas and the air.

In some embodiments, the air distribution plate 6230 is a multi-stage air distribution plate 6230, and the multi-stage air distribution plate 6230 is disposed in the cavity 61 at intervals, so that the air and the fuel gas entering the cavity 61 from the air inlet side 611 sequentially pass through the multi-stage air distribution plate 6230 and then are discharged from the air outlet side 612, and the air and the fuel gas are mixed in multiple stages, so that the mixing is more uniform.

In other words, after the air and the fuel gas enter the cavity 61 from the air inlet side 611, the air and the fuel gas are primarily mixed at the position of the air inlet side 611, and then the air and the fuel gas sequentially pass through the multi-stage air distribution plate 6230, when the air and the fuel gas pass through each stage of air distribution plate 6230, the air and the fuel gas are primarily mixed, and finally the air and the fuel gas are discharged from the air outlet side 612, and the air and the fuel gas after passing through the multi-stage air distribution plate 6230 are uniformly mixed and have good combustibility, so that the air and fuel gas mixture coming out from the air outlet side 612 can be fully combusted after entering the combustor.

The air intake side 611 may be centered, left or right to avoid other components of the gas combustion device according to actual requirements.

The multi-stage grid 6230 can have one grid 6230, two grids 6230, or more grids 6230. The multi-stage air distribution plates 6230 have a space therebetween, which can provide a buffer space for the air-fuel mixture.

The premixing cavity 6 for the gas combustion equipment according to the embodiment of the present invention can pre-mix air and gas, and after the air and the gas are primarily mixed at the air inlet side 611, the air distribution plate 6230 can re-mix the air and the gas, so as to improve the uniformity of the air and the gas mixture, further improve the combustibility of the air and gas mixture, and enable the air and gas mixture to be fully combusted at the combustion stage.

In the embodiment shown in fig. 2-4, the multi-stage aerofoil 6230 comprises: a primary air distribution plate 62 and a secondary air distribution plate 63, wherein the primary air distribution plate 62 is close to the air inlet side 611, the secondary air distribution plate 63 is close to the air outlet side 612, the secondary air distribution plate 63 is arranged at the downstream side of the primary air distribution plate 62 when viewed from the air flowing direction, and the secondary air distribution plate 63 is arranged above the primary air distribution plate 62 as shown in fig. 3. The air and the fuel gas entering the cavity 61 from the air inlet side 611 pass through the primary air distribution plate 62, then pass through the secondary air distribution plate 63, and finally are discharged from the air outlet side 612.

Specifically, as shown in fig. 3, the primary air distribution plate 62 has a diversion guide structure 621, and the diversion guide structure 621 is used for diverting and guiding the air and the fuel gas entering the cavity 61 from the air inlet side 611. The diversion guide structure 621 can scatter the air-fuel mixture entering the cavity 61 from the air inlet side 611, so that the air-fuel mixture is diverted to the left and right sides, thereby further improving the mixing uniformity of the air and the fuel.

Further, the cavity 61 includes: a chamber body 613 and an inlet portion 611, wherein the inlet portion 611 is mounted to the chamber body 613, as shown in fig. 3, the inlet portion 611 is mounted below the chamber body 613, and the inlet portion 611 and the chamber body 613 are preferably integrally formed, and the chamber body 613 and the inner cavity of the inlet portion 611 communicate with each other. The inlet part 611 is configured as the air inlet side 611, the inlet part 611 is provided with an air inlet 6111 and a fuel gas inlet 6112, air enters the cavity 61 through the air inlet 6111, fuel gas enters the cavity 61 through the fuel gas inlet 6112, the air inlet 6111 is separated from the fuel gas inlet 6112, the air inflow of the air and the fuel gas can be independently adjusted, and the adjustment of the proportion of the air and the fuel gas is facilitated, so that the combustion requirement is met.

Further, the air inlet 6111 is opposite to the diversion guide 621. The air entering the cavity 61 from the air inlet 6111 and the fuel gas entering the cavity 61 from the fuel gas inlet 6112 flow upward along the air inlet 6111 shown in fig. 3 under the action of gas pressure, the diversion guide structure 621 is opposite to the air inlet 6111, so that the air-fuel gas mixture can directly impact the diversion guide structure 621, the diversion guide structure 621 divides the air-fuel gas mixture into a part flowing leftwards and a part flowing rightwards, the diversion process can disperse the air and the fuel gas, and the degree of mixing the air and the fuel gas is increased.

Specifically, as shown in fig. 3, the inlet portion 611 is located at the bottom of the cavity body 613, the air inlet 6111 is located at the bottom surface of the inlet portion 611, the gas inlet 6112 is located on the outer wall of the side surface of the inlet portion 611, and the air inlet 6111 and the gas inlet 6112 are perpendicular. Thus, the impact force of the air entering the cavity 61 from the air inlet 6111 and the gas entering the cavity 61 from the gas inlet 6112 is large at the inlet portion 611, and the air and the gas collide, thereby accelerating the mixing of the air and the gas.

Referring to fig. 3, the primary air distribution plate 62 may include: a first segment 622 and a second segment 623 located on either side of the diverging guide 621, the diverging guide 621 projecting towards the inlet side 611 opposite the first segment 622 and the second segment 623. The first segment 622 is located on the left side of the flow dividing guide structure 621, the second segment 623 is located on the right side of the flow dividing guide structure 621, and the flow dividing guide structure 621 is configured into a similar conical structure protruding toward the intake side 611, thereby making the flow dividing guide effect of the flow dividing guide structure 621 on the air-fuel mixture more remarkable when the air and fuel gas from the intake side 611 reach the flow dividing guide structure 621.

Specifically, the diversion guide structure 621 includes: a first beveled segment 6211 and a second beveled segment 6212, the first beveled segment 6211 being connected to the first segment 622 and the second beveled segment 6212 being connected to the second segment 623. The first inclined surface section 6211 and the second inclined surface section 6212 are arranged in a V shape, the first inclined surface section 6211 guides a part of the air-fuel mixture to the left side, and the second inclined surface section 6212 guides a part of the air-fuel mixture to the right side.

Further, a windward section 6213 is arranged between the first inclined section 6211 and the second inclined section 6212, and the angle between the first inclined section 6211 and the first section 622 is between 15 ° and 75 °, and the angle between the second inclined section 6212 and the second section 623 is between 15 ° and 75 °. For example, the first beveled segment 6211 is angled at 45 ° to the first segment 622 and the second beveled segment 6212 is angled at 30 ° to the second segment 623. It should be noted that the angle is defined as an acute angle, which refers to the angle between the plane of the first inclined surface segment 6211 and the plane of the first segment 622 (or the angle between the plane of the second inclined surface segment 6212 and the plane of the second segment 623), and in practical configurations, the angle may be represented as an obtuse angle.

Specifically, the cavity 61 includes: the cavity body 613, the diapire of cavity body 613 is formed with the first slope diapire 6131 that corresponds with first section 622, the first slope diapire 6131 is the same with the slope direction of first inclined plane section 6211, the diapire of cavity body 613 is formed with the second slope diapire 6132 that corresponds with second section 623, the slope direction of second slope diapire 6132 is the same with the slope direction of second inclined plane section 6212. Note that "the inclination directions are the same" is not limited to the inclination angles being completely the same, as long as both have the same inclination tendency. For example, the first inclined bottom wall 6131 and the first inclined surface section 6211 are inclined to the upper left, and the second inclined bottom wall 6132 and the second inclined surface section 6212 are inclined to the upper right.

The diversion guide structure 621, the first section 622 and the second section 623 are all provided with primary air distribution small holes 624, as shown in fig. 4, the windward section 6213 can also be provided with the primary air distribution small holes 624, and the first section 622 and the second section 623 are also provided with primary air distribution large holes (not shown in the figure). When the air and the fuel gas pass through the primary air distribution small holes 624 or the primary air distribution big holes, the passing area of the gas is suddenly reduced, so that the flowing speed of the gas at the primary air distribution small holes 624 or the primary air distribution big holes can be accelerated, and the air and the fuel gas can be further mixed. The aperture of the first-level air distribution big hole is larger than that of the first-level air distribution small hole 624, so that the gas circulation speed of the first-level air distribution plate 62 can be properly increased, and the first-level air distribution plate 62 is prevented from being damaged due to the fact that the gas pressure on the first-level air distribution plate 62 is too large due to the fact that the aperture is too small.

Referring to fig. 3, the first segment 622 and the second segment 623 are in the same plane, and the first segment 622 and the second segment 623 are both parallel to the secondary air distribution plate 63, so that the pressure of air and fuel gas between the primary air distribution plate 62 and the secondary air distribution plate 63 is relatively uniform.

The second air distribution plate 63 is uniformly provided with second air distribution holes 631. The air between the first level air distribution plate 62 and the second level air distribution plate 63 reaches the air outlet side 612 through the second level air distribution holes 631, and the air and the fuel gas can be mixed again at the second level air distribution holes 631, so that the mixing uniformity is further improved.

Referring to fig. 1-5, the top of the chamber 61 is further provided with an annular flange 614, and the flange 614 is adapted to support and fix the burner so as to enhance the mounting firmness of the burner.

The burner assembly according to the second aspect of the present invention comprises a burner and the premixing chamber 6 for gas combustion apparatus of the above embodiment, the burner is disposed at the outlet side 612 of the premixing chamber 6, so that the air-gas mixture discharged from the outlet side 612 is combusted at the burner.

The combustor is a preheating combustor or a flameless catalytic combustor, the preheating combustor can preheat the flameless catalytic combustor, so that the temperature of the flameless catalytic combustor reaches a proper working temperature, the catalysis is more sufficient, the gas in the combustor is fully combusted, and harmful gases such as CO and NOx are prevented from being generated due to insufficient combustion.

A gas combustion device according to an embodiment of a third aspect of the invention comprises the burner assembly of the above embodiment.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A premix chamber for a gas combustion apparatus, comprising:

a cavity having an inlet side and an outlet side;

the air distribution plate is arranged in the cavity and separates the air inlet side from the air outlet side, so that air and fuel gas entering the cavity from the air inlet side are discharged from the air outlet side after passing through the air distribution plate, wherein the air distribution plate is used for mixing the fuel gas and the air.

2. The premixing chamber for a gas combustion apparatus as claimed in claim 1 wherein the air distribution plate is a multi-stage air distribution plate, the air distribution plate being spaced apart within the chamber.

3. The premixing chamber for a gas combustion apparatus as claimed in claim 1, wherein the air distribution plate is a multi-stage air distribution plate, the air distribution plate being arranged at intervals in the chamber, the multi-stage air distribution plate comprising: the air distribution plate comprises a first-stage air distribution plate and a second-stage air distribution plate, wherein the first-stage air distribution plate is close to the air inlet side, and the second-stage air distribution plate is close to the air outlet side.

4. The premix chamber for a gas combustion device as in claim 3, wherein said primary air distribution plate has a flow splitting guide structure for flow splitting guiding said air and gas entering into said chamber from said air intake side.

5. The premix chamber for a gas combustion device according to claim 4, wherein said chamber comprises:

the gas-water separator comprises a cavity body and an inlet part, wherein the inlet part is arranged on the cavity body, the inlet part is constructed to be at the gas inlet side, and the inlet part is provided with an air inlet and a fuel gas inlet.

6. The premix chamber for a gas combustion device as in claim 5, wherein said air inlet is directly opposite said flow divider guide.

7. The premix chamber for a gas combustion device as in claim 6, wherein said inlet section is located at a bottom of said chamber body, said air inlet is located at a bottom surface of said inlet section, said gas inlet is located on an outer wall of said inlet section, and said air inlet and said gas inlet are perpendicular.

8. The premix chamber for a gas combustion device according to claim 4, wherein said primary air distribution plate comprises: the first section and the second section are positioned on two sides of the flow dividing guide structure, and the flow dividing guide structure is opposite to the first section and the second section and protrudes towards the air inlet side.

9. The premix chamber for a gas combustion device according to claim 8, wherein said flow-splitting guide structure comprises: the first inclined plane section is connected with the first section, and the second inclined plane section is connected with the second section.

10. The premix chamber for a gas combustion device according to claim 9, wherein a windward section is provided between said first ramp section and said second ramp section, and wherein the angle of said first ramp section to said first section is between 15 ° and 75 ° and the angle of said second ramp section to said second section is between 15 ° and 75 °.

11. A premix chamber for a gas combustion device according to claim 10, characterized in that said chamber comprises: the cavity body, the diapire of cavity body be formed with first slope diapire that first section corresponds, first slope diapire with the incline direction of first inclined plane section is the same, the diapire of cavity body be formed with the second slope diapire that the second section corresponds, the second slope diapire with the incline direction of second inclined plane section is the same.

12. The premixing chamber for a gas combustion apparatus as claimed in claim 9, wherein the flow dividing guide structure, the first section and the second section are all provided with a primary air distribution small hole, and the first section and the second section are further provided with a primary air distribution large hole.

13. The premix chamber for a gas combustion device according to claim 9, wherein said first section and said second section are in the same plane and parallel to a secondary air distribution plate.

14. The premixing chamber for a gas combustion apparatus as claimed in claim 3, wherein the secondary air distribution plate is uniformly provided with secondary air distribution holes.

15. The premix chamber for a gas combustion device according to claim 1, wherein the top of said chamber body is further provided with an annular flange adapted to support a stationary burner.

16. A burner assembly, comprising: a burner and the premix chamber according to any of claims 1 to 15, the burner being arranged at the air exit side of the premix chamber such that an air-gas mixture flowing out of the air exit side is combusted at the burner.

17. The burner assembly of claim 16 wherein the burner is a preheat burner or a flameless catalytic burner.

18. A gas combustion device, comprising a burner assembly as claimed in claim 16 or 17.