CN218993392U - Fire row assembly and combustor - Google Patents

Abstract

The utility model relates to the technical field of gas water heaters, in particular to a fire grate assembly and a burner. The fire grate assembly comprises a fire grate body and a combustion head, wherein an injection channel and a main air flow channel which are communicated are arranged in the fire grate body; the combustion head is arranged at the top of the fire grate body, the combustion head is provided with a first fire hole plate, a second fire hole plate and a third fire hole plate, the first fire hole plate and the third fire hole plate are arranged in a step mode, the second fire hole plate is arranged between the first fire hole plate and the third fire hole plate, two sides of the second fire hole plate are connected with the first fire hole plate and the third fire hole plate respectively, the first fire hole plate is provided with a first fire hole, the third fire hole plate is provided with a third fire hole, projections of the first fire hole and the third fire hole on a horizontal plane and a vertical plane are not overlapped, the horizontal height of the third fire hole is higher than that of the first fire hole, and the first fire hole is at least partially arranged opposite to the third fire hole. The structure of one combustion head can realize the gradation combustion, is favorable for reducing the production cost and has higher reliability.

Description

Fire row assembly and combustor

Technical Field

The utility model relates to the technical field of gas water heaters, in particular to a fire grate assembly and a burner.

Background

The gas water heater takes gas as the gas, the mixed air and the gas are combusted in a combustion chamber through a burner to generate high-temperature smoke, and the high-temperature smoke flows through a heat exchanger to exchange heat with cold water in the heat exchanger, so that the purpose of preparing hot water is achieved.

The burners in gas water heaters are roughly classified into atmospheric burners, full premix burners, water-cooled burners and rich-lean burners, but the above-mentioned burners have the following problems: the full premix burner, the water-cooled burner and the rich-lean burner have obvious nitrogen oxide emission effect, but have complex structure and high cost; while the atmospheric burner has a relatively simple structure, the nitrogen oxide discharge effect is not obvious.

Disclosure of Invention

One of the technical problems to be solved by the utility model is to provide a fire exhaust assembly which can realize obvious nitrogen oxide emission effect on the premise of simple structure and low cost.

The second technical problem to be solved by the utility model is to provide a burner which can realize obvious nitrogen oxide emission effect on the premise of simple structure and low cost.

The first technical problem is solved by the following technical scheme:

a fire grate assembly comprising:

the fire grate body is internally provided with an injection channel and a main airflow channel which are communicated with each other;

the burner comprises a burner body, wherein the burner body is arranged at the top of the burner body, the burner body is provided with a first fire hole plate, a second fire hole plate and a third fire hole plate, the first fire hole plate and the third fire hole plate are arranged in a stepped mode, the second fire hole plate is arranged between the first fire hole plate and the third fire hole plate, two sides of the second fire hole plate are respectively connected with the first fire hole plate and the third fire hole plate, the first fire hole plate is provided with a first fire hole, the third fire hole plate is provided with a third fire hole, the first fire hole and the third fire hole are communicated with the main air flow channel, the projections of the first fire hole and the third fire hole on the horizontal plane and the vertical plane are not overlapped, the horizontal height of the third fire hole is higher than that of the first fire hole, the first fire hole is arranged in the width direction of the burner body at least in a part of the direction of the burner body, and the third fire hole is arranged oppositely.

Compared with the background technology, the gas water heater has the following beneficial effects:

because the first fire hole plate and the third fire hole plate are arranged in a step mode, projections of the first fire hole plate and the third fire hole plate on the horizontal plane and the vertical plane are not overlapped, when the fire bar assembly burns, secondary supplementary air is supplemented upwards from two sides of the fire bar assembly, the first fire hole is enabled to be in contact with secondary supplementary excessive air at first, combustion gas occupies lower light combustion at the first fire hole position, smoke formed by combustion at the first fire hole position is matched with flame at the third fire hole in a contact mode, gas occupies higher light combustion at the third fire hole position, air occupies lower light combustion at the third fire hole position, therefore the effect of light and dark staged combustion is achieved, light and dark staged combustion of nitrogen oxides generated in combustion can be reduced through the structure of the combustion head.

In one embodiment, the second fire hole plate is provided with a second fire hole, the second fire hole is communicated with the main air flow channel, and the second fire hole is at least partially opposite to the first fire hole or the third fire hole along the width direction of the fire row body.

In one embodiment, each of the first fire holes, each of the second fire holes and each of the third fire holes includes a first fire dividing hole and two second fire dividing holes, wherein the first fire dividing holes are elongated and are arranged along the length direction of the fire row body, and the two second fire dividing holes are arranged on two sides of the first fire dividing hole along the length direction of the fire row body.

In one embodiment, the vertical distance between the first fire hole and the second fire hole is 5mm-10mm, and the vertical distance between the second fire hole and the third fire hole is 2mm-5mm.

In one embodiment, the area of the first fire hole is 30% -40% of the total area of the first fire hole, the second fire hole and the third fire hole.

In one embodiment, the top wall of the first fire hole plate is distributed with two first fire hole columns arranged along the length direction of the first fire hole plate, and each first fire hole column comprises a plurality of first fire holes.

The second technical problem is solved by the following technical scheme:

the burner comprises a shell and a plurality of fire row assemblies according to any scheme, wherein the fire row assemblies are arranged in the shell at intervals, guide plates for distributing air are arranged on two sides of each fire row assembly, a guide cavity is formed between each guide plate and the corresponding side wall of each fire row assembly, a first fire hole is formed in each guide cavity, and an air passing port communicated with each guide cavity is formed in the lower portion of each guide plate.

Compared with the background technology, the control method of the gas water heater has the following beneficial effects:

the adjacent two guide plates separate air, so that the condition that partial air of the partial fire grate assembly is used by the adjacent fire grate assembly due to the fact that the air is diffused everywhere, and the nitrogen oxide concentration is increased due to the fact that mixed gas of the partial fire grate assembly is lack of air and can not be fully combusted can be prevented.

In one embodiment, the deflector comprises a first connecting portion, a first vertical plate segment, a second connecting portion and a second vertical plate segment which are sequentially connected from bottom to top, wherein the first connecting portion is fixedly connected with the fire grate body, the second vertical plate segment is at least partially aligned with the top side wall of the fire grate body, the first vertical plate segment is at least partially aligned with the second fire hole plate, and the distance D1 between the first vertical plate segment and the second fire hole plate is greater than the distance D2 between the second vertical plate segment and the second fire hole plate.

In one embodiment, the first connecting portion is a plurality of connecting strips, the plurality of connecting strips are arranged at intervals at the bottom of the first vertical plate section, and the gas passing opening is formed between two adjacent connecting strips.

In one embodiment, the outer side walls of adjacent two of said first vertical plate sections are abutted or welded.

Drawings

FIG. 1 is a schematic view of a fire grate assembly according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a burner head according to an embodiment of the present utility model;

FIG. 3 is a top view of a combustion head provided in an embodiment of the present utility model;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a cross-sectional view of FIG. 1;

FIG. 6 is a schematic view of a fire grate assembly with a deflector according to an embodiment of the present utility model;

FIG. 7 is a cross-sectional view of a fire grate assembly provided with a deflector in accordance with an embodiment of the present utility model;

FIG. 8 is a schematic view of a burner according to an embodiment of the present utility model;

fig. 9 is a cross-sectional view of a burner provided by an embodiment of the present utility model.

Description of the reference numerals:

1. a fire grate body; 11. an injection channel; 111. a flaring section; 112. a closing-in section; 113. a mixing section; 12. a main air flow channel; 121. a first channel; 122. a second channel;

2. a combustion head; 21. a first fire hole plate; 211. a first fire hole; 2111. a first fire dividing hole; 2112. a second fire dividing hole; 22. a second fire hole plate; 221. a second fire hole; 23. a third fire hole plate; 231. a third fire hole;

3. a deflector; 31. a first connection portion; 32. a first vertical plate segment; 33. a second connecting portion; 34. a second vertical plate segment; 35. a gas passing port;

4. a housing; 5. a diversion chamber.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Aiming at the problems of the prior art that the burner has obvious nitrogen oxide emission effect, complex structure, high cost and low cost, the utility model provides a fire exhaust assembly and the burner for solving the technical problems.

As shown in fig. 1, the fire grate assembly comprises a fire grate body 1 and a combustion head 2, wherein an injection channel 11 and a main air flow channel 12 which are communicated are arranged in the fire grate body 1; the injection channel 11 introduces mixed gas of air and fuel gas, the mixed gas enters the combustion head 2 from the main air flow channel 12, the combustion head 2 is arranged at the top of the fire grate body 1, the combustion head 2 is provided with a first fire grate plate 21, a second fire grate plate 22 and a third fire grate plate 23, the first fire grate plate 21 and the third fire grate plate 23 are arranged in a stepped mode, the second fire grate plate 22 is arranged between the first fire grate plate 21 and the third fire grate plate 23, two sides of the second fire grate plate 22 are respectively connected with the first fire grate plate 21 and the third fire grate plate 23, the longitudinal section of the combustion head 2 is of a convex structure, the first fire grate plate 21 is provided with a first fire grate hole 211, the third fire grate plate 23 is provided with a third fire grate hole 231, the first fire grate hole 211 and the third fire grate hole 231 are communicated with the main air flow channel 12, projections of the first fire grate hole 211 and the third fire grate hole 231 are not overlapped on a horizontal plane and a vertical plane, the third fire grate hole 231 is higher than the first fire grate hole 211 in horizontal plane, and the third grate hole is arranged opposite to the third fire grate hole 231.

Because the first fire hole plate 21 and the third fire hole plate 23 are arranged in a stepped manner, projections of the first fire hole 211 and the third fire hole 231 on the horizontal plane and the vertical plane are not overlapped, when the fire bar assembly burns, secondary supplementary air is supplemented upwards from two sides of the fire bar, so that the first fire hole 211 is firstly contacted with secondary supplementary excessive air, combustion gas occupies a lower light combustion at the first fire hole 211, smoke generated by combustion at the first fire hole 211 is matched with flame contact at the third fire hole 231 upwards, and gas occupies a higher light combustion at the third fire hole 231, the air occupies a lower light combustion, thereby achieving the effect of light and dark staged combustion.

In this embodiment, in order to ensure the total area of the fire holes, the effect of reducing the nitrogen oxides of the entire fire bar assembly is better, as shown in fig. 2, the second fire hole plate 22 is provided with a second fire hole 221, the second fire hole 221 is communicated with the main air flow channel 12, and at least part of the second fire hole 221 is disposed opposite to the first fire hole 211 or the third fire hole 231 along the width direction of the fire bar body 1. The first fire holes 211 and the third fire holes 231 are arranged in the horizontal direction, so that smooth gas outlet is ensured, and the second fire holes 221 are arranged in the vertical direction, so that a certain total fire hole area is ensured. The fuel gas flows out from the second fire hole 221 and the third fire hole 231 and is mixed with secondary air for combustion, at the moment, the secondary air quantity is relatively sufficient, the secondary air quantity is larger than the air quantity required for combustion, the fuel gas and the air are fully mixed, and the fuel gas is subjected to lean combustion, so that the combustion reaction is slowed down, the flame temperature is lowered, and the generated nitrogen oxides are reduced.

In the present embodiment, the vertical distance between the first fire hole 211 and the second fire hole 221 is 5mm to 10mm, the vertical distance between the first fire hole 211 and the second fire hole 221 is specifically selected to be 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, the vertical distance between the second fire hole 221 and the third fire hole 231 is specifically selected to be 2mm to 5mm, and the vertical distance between the second fire hole 221 and the third fire hole 231 is specifically selected to be 2mm, 3mm, 4mm or 5mm. The arrangement can ensure the full combustion of the fuel gas and reduce the generation of nitrogen oxides.

Alternatively, in the present embodiment, the area of the first fire hole 211 occupies 30% -40% of the total area of the first fire hole 211, the second fire hole 221 and the third fire hole 231, so that the thick combustion formed at the first fire hole 211 occupies a proper ratio compared to the light combustion formed at the second fire hole 221 and the third fire hole 231, which is more advantageous for reducing the generation of nitrogen oxides.

Correspondingly, in this embodiment, as shown in fig. 3, two rows of first fire holes arranged along the length direction of the first fire hole plate 21 are distributed on the top wall of the first fire hole plate 21, and each row of first fire holes includes a first fire hole 211, so that the arrangement of the first fire holes 211 is facilitated, the occupation ratio of the total fire hole area occupied by the first fire holes 211 is increased, and the fuel gas can be fully combusted.

As shown in fig. 4, each first fire hole 211, each second fire hole 221 and each third fire hole 231 includes a first fire dividing hole 2111 and two second fire dividing holes 2112 which are elongated and are arranged along the length direction of the fire row body 1, and two second fire dividing holes 2112 are arranged on two sides of the first fire dividing hole 2111 along the length direction of the fire row body 1, and the arrangement of the first fire dividing holes 2111 and the second fire dividing holes 2112 can facilitate the combustion of fuel gas and improve the total fire hole area.

The fire grate body 1 forms a communicated injection channel 11 which is approximately U-shaped and is opened towards the left side, so that the flow path of the air of the fuel gas can be prolonged, and the fuel gas and the air can be fully mixed. As shown in fig. 5 and 6, the injection channel 11 may include a flared section 111, a closed section 112 and a mixing section 113 that are sequentially communicated, wherein the cross-sectional area of the flared section 111 is larger than that of the closed section 112, and the flared section 111 with a larger cross-sectional area is not only convenient for connection with an air pipe, but also can enable a large amount of air to enter; the smaller cross-sectional area of the convergent section 112 increases the flow rate of the mixed gas, allowing the mixed gas to quickly enter the mixing section 113.

The cross section of the mixing section 113 is gradually increased so that the flow rate of the mixed gas is reduced so that the mixed gas can be sufficiently mixed. The mixing section 113 is convenient to change at the right-hand bend, flowing upward to the left; and the top ends of the mixing sections 113 of the upper half are opened in the a direction, and are all communicated with the main gas flow passage 12 so as to simultaneously supply the mixed gas to all the combustion holes. The cross-sectional area of the mixing section 113 of the upper half section gradually decreases from left to right in the direction a in order to make the mixed gas entering the main gas flow passage 12 relatively uniform in the direction a, thereby improving the uniformity of the flames of the plurality of combustion holes.

The main air flow channel 12 comprises a first channel 121 and a second channel 122 which are sequentially communicated, wherein one end of the first channel 121 is connected with the injection channel 11, and the area of the cross section of the first channel 121 is smaller than that of the cross section of the second channel 122, so that the flow rate of the mixed gas is changed by changing the cross section area of the channels, and the uniformity of the mixed gas is continuously improved. The mixed gas in the first passage 121 enters the third flame holes 231 and the second flame holes 221, respectively.

In this embodiment, as shown in fig. 8 and 9, the burner includes a housing 4 and a plurality of fire-row assemblies in this embodiment, the fire-row assemblies are arranged in the housing 4 at intervals, two sides of each fire-row assembly are respectively provided with a baffle 3 for distributing air, the baffles 3 are fixedly arranged on two sides of the fire-row body 1, a flow guiding chamber 5 is formed between the baffle 3 and the corresponding side wall of the fire-row assembly, the first fire holes 211 and the second fire holes 221 are located in the flow guiding chamber 5, and a gas passing port 35 communicated with the flow guiding chamber 5 is arranged at the lower part of the baffle 3. The adjacent two guide plates 3 separate air, the air enters into different guide cavities 5 from the air ports 35 formed by the different guide plates 3 and the fire grate components, the different guide cavities 5 can prevent the air from being diffused everywhere to cause the partial air of the partial fire grate components to be used by the adjacent fire grate components, and the mixed gas of the partial fire grate components can not be fully combusted due to lack of air to cause the condition that the concentration of nitrogen oxides is increased.

In some embodiments, as shown in fig. 6 and 7, the deflector 3 includes a first connection portion 31, a first vertical plate segment 32, a second connection portion 33 and a second vertical plate segment 34, which are sequentially connected from bottom to top, and two sides of the second connection portion 33 are respectively connected with the first vertical plate segment 32 and the second vertical plate segment 34, and the first connection portion 31 is fixedly connected with the fire grate body 1. The first connecting portion 31 is used for connecting the deflector 3 with the fire grate body 1, the second connecting portion 33 is used for connecting the first vertical plate section 32 with the second vertical plate section 34, and two ends of the second connecting portion 33 are respectively connected with the first vertical plate section 32 and the second vertical plate section 34 in a fairing manner, so that air circulation can be prevented from being blocked at corners. The second vertical plate section 34 is at least partially aligned with the top sidewall of the fire grate body 1 and the first vertical plate section 32 is at least partially aligned with the second fire grate plate 22 such that the first and second vertical plate sections 31, 34 cooperate to gather and channel secondary air to facilitate combustion of the gas at the second and third fire holes 221, 231.

Further, in the present embodiment, the distance D1 between the first vertical plate section 32 and the second fire hole plate 22 is greater than the distance D2 between the second vertical plate section 34 and the second fire hole plate 22. This is advantageous to encase more air for combustion of the gas injected by the third flame holes 231, and the second vertical plate section 34 may direct the mixed flue gas vertically upward, so that the mixed flue gas participates in combustion of the second flame holes 221 and the first flame holes 211, thereby facilitating stratified combustion of the second flame holes 221 and the first flame holes 211. As shown in fig. 9, since D1> D2, the guide chamber 5 is ensured to have a sufficient width for air to pass therethrough, and the air passing through the guide chamber 5 can be guided as close to the second fire hole plate 22 as possible, thereby facilitating light combustion of the third fire hole 231.

In order to enable air to flow into the space surrounded by the guide plate 3 and the fire grate body 1, in this embodiment, the first connecting portion 31 is a plurality of connecting strips, the plurality of connecting strips are arranged at the bottom of the first vertical plate section 32 at intervals, and an air passing port 35 is formed between two adjacent connecting strips. Thus, air enters from between the first connecting parts 31, and the first connecting parts 31 are arranged at the bottom of the first vertical plate section 32 at intervals so that the air can enter into the space formed by the fire row and the guide plate 3, thereby participating in the combustion of the third fire holes 231 and the second fire holes 221.

To prevent secondary air from being discharged directly after entering between the adjacent two deflectors 3, resulting in waste of secondary air, for which purpose, in some embodiments, the outer side walls of the adjacent two deflectors 3 are abutted or welded. In particular, this can be achieved by abutting or welding two adjacent first vertical plate sections 32.

In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing detailed description of the embodiments presents only a few embodiments of the present utility model, which are described in some detail and are not intended to limit the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. Fire row subassembly, its characterized in that includes:

the fire grate comprises a fire grate body (1), wherein an injection channel (11) and a main air flow channel (12) which are communicated are arranged in the fire grate body (1);

the burner comprises a burner body (1), wherein the burner body (2) is arranged at the top of the burner body (1), the burner body (2) is provided with a first fire hole plate (21), a second fire hole plate (22) and a third fire hole plate (23), the first fire hole plate (21) and the third fire hole plate (23) are arranged in a stepped mode, the second fire hole plate (22) is arranged between the first fire hole plate (21) and the third fire hole plate (23) and two sides of the second fire hole plate (22) are respectively connected with the first fire hole plate (21) and the third fire hole plate (23), the first fire hole plate (21) is provided with a first fire hole (211), the third fire hole plate (23) is provided with a third fire hole (231), the first fire hole (211) and the third fire hole (231) are all communicated with a main air flow channel (12), the first fire hole (211) and the third fire hole (231) are not overlapped with a vertical plane, and are at least in the same height as the first fire hole (231) and are arranged in the same direction as the first fire hole (231).

2. The fire grate assembly according to claim 1, wherein the second fire orifice plate (22) is provided with a second fire orifice (221), the second fire orifice (221) being in communication with the main air flow passage (12), the second fire orifice (221) being at least partially disposed opposite to the first fire orifice (211) or the third fire orifice (231) in the width direction of the fire grate body (1).

3. The fire grate assembly according to claim 2, wherein each of the first fire holes (211), each of the second fire holes (221) and each of the third fire holes (231) comprises a first fire dividing hole (2111) which is elongated and is arranged along the length direction of the fire grate body (1) and two second fire dividing holes (2112) which are dot-shaped, and the two second fire dividing holes (2112) are arranged on two sides of the first fire dividing hole (2111) along the length direction of the fire grate body (1).

4. The fire grate assembly of claim 2, wherein the first fire hole (211) is vertically spaced from the second fire hole (221) by a distance of 5mm-10mm, and the second fire hole (221) is vertically spaced from the third fire hole (231) by a distance of 2mm-5mm.

5. The fire grate assembly of claim 2, wherein the area of the first fire hole (211) is 30% -40% of the total area of the first fire hole (211), the second fire hole (221) and the third fire hole (231).

6. The fire grate assembly of claim 1, wherein the top wall of the first fire grate plate (21) is provided with two first fire grate hole rows arranged along the length direction of the first fire grate plate (21), and each first fire grate hole row comprises a plurality of first fire grate holes (211).

7. The burner is characterized by comprising a shell (4) and a plurality of fire row assemblies as claimed in any one of claims 1-6, wherein a plurality of fire row assemblies are arranged in the shell (4) at intervals, guide plates (3) for distributing air are arranged on two sides of each fire row assembly, a guide chamber (5) is formed between each guide plate (3) and the corresponding side wall of the fire row assembly, a first fire hole (211) is formed in the guide chamber (5), and an air passing port (35) communicated with the guide chamber (5) is formed in the lower part of each guide plate (3).

8. Burner according to claim 7, characterized in that the deflector (3) comprises a first connection (31), a first vertical plate section (32), a second connection (33) and a second vertical plate section (34) connected in sequence from bottom to top, the first connection being fixedly connected with (31) the fire grate body (1), the second vertical plate section (34) being at least partially aligned with the top side wall of the fire grate body (1), the first vertical plate section (32) being at least partially aligned with the second fire perforated plate (22), the distance D1 between the first vertical plate section (32) and the second fire perforated plate (22) being greater than the distance D2 between the second vertical plate section (34) and the second fire perforated plate (22).

9. Burner according to claim 8, wherein the first connecting portion (31) is a plurality of connecting bars, which are arranged at intervals at the bottom of the first vertical plate section (32), and the gas passing opening (35) is formed between two adjacent connecting bars.

10. Burner according to claim 8, characterized in that the outer side walls of two adjacent first vertical plate sections (32) are abutted or welded.

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