CN220958457U

CN220958457U - Fire row assembly and combustor

Info

Publication number: CN220958457U
Application number: CN202322640075.3U
Authority: CN
Inventors: 卢宇轩; 陈露
Original assignee: Guangdong Vanward New Electric Co Ltd
Current assignee: Guangdong Vanward New Electric Co Ltd
Priority date: 2023-09-27
Filing date: 2023-09-27
Publication date: 2024-05-14
Anticipated expiration: 2033-09-27

Abstract

The utility model relates to the technical field of water heaters, in particular to a fire grate assembly and a burner. The fire row assembly comprises a fire row body and a combustion head, wherein a main air flow channel is arranged in the fire row body, a first injection pipe and a second injection pipe are convexly arranged outside the fire row body, an outlet of the second injection pipe is communicated with the main air flow channel, and an outlet of the first injection pipe extends into the second injection pipe. The high-speed gas jet ejected from the nozzle and injecting ambient air into the first injection pipe, and the gas and the first air are mixed in the first injection pipe, then injected again into the second injection pipe through the first injection pipe, and then mixed with the second air entering from the second injection pipe. Therefore, the secondary air is adopted for the fire exhaust assembly, the injection capacity of primary air can be enhanced, the mixing degree of fuel gas and air is greatly enhanced, the combustion efficiency is improved, and the emission of harmful gas in smoke is reduced.

Description

Fire row assembly and combustor

Technical Field

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

Background

A burner is a device for converting substances into heat energy by combustion, i.e. by mixing air with fuel by a premixing device and burning. The burner is classified into a fuel burner, a gas burner and a dual fuel burner according to the dye that it burns. Among them, the gas burner is most widely used in civilian applications.

The burner mainly comprises a combustion chamber shell and fire rows arranged in the shell, wherein each fire row is arranged in parallel in the combustion chamber shell, and gaps for air to pass through are arranged between adjacent fire rows. The inlet position of each fire row is provided with a front pipe nozzle opening, and the fire row for connecting fuel gas is selected through the electromagnetic valve and the front pipe selection mechanism, so that the combustion section position is controlled, and the heating effect of different sections is obtained. However, the existing fire grate has the following defects: the quantity of air sucked by the ejection structure of the fire grate is limited, so that the improvement of combustion efficiency, mixing capacity and smoke discharge capacity is limited.

Disclosure of utility model

One of the technical problems to be solved by the utility model is to provide a fire grate assembly which can improve the air quantity sucked by an injection pipe and the combustion efficiency.

The second technical problem to be solved by the utility model is to provide a burner which can improve the combustion efficiency and the mixing capability of air and gas.

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

A fire grate assembly comprising:

The fire grate body, this internal main air current passageway that is provided with of fire grate, the fire grate body is protruding to be equipped with first injection pipe and second injection pipe outward, the export of second injection pipe with main air current passageway intercommunication, the export of first injection pipe stretches into in the second injection pipe.

Compared with the background technology, the fire grate assembly has the beneficial effects that:

The high-speed gas jet ejected from the nozzle is used for ejecting ambient air into the first ejection pipe, and the gas and the first air are ejected again into the second ejection pipe through the first ejection pipe after being mixed in the first ejection pipe, and then are mixed with the second air entering from the second ejection pipe. Therefore, the fire exhaust assembly is introduced by adopting secondary air, the injection capacity of the air can be enhanced, the mixing degree of fuel gas and air is greatly enhanced, the combustion efficiency is improved, and the emission of harmful gas in smoke is reduced.

In one embodiment, the first ejector tube includes a first constriction and a first mixing stage in communication with the small end of the first constriction, and the second ejector tube includes a second constriction and a second mixing stage in communication with the small end of the second constriction, the first mixing stage extending into the second constriction.

In one embodiment, the length of the first mixing section extending into the second shrinking section is L, and the value of L ranges from 3mm to 10mm.

In one embodiment, the range of the inlet area of the first ejector pipe is 100mm ²-350mm².

In one embodiment, the inlet area of the first ejector tube is 130mm ².

In one embodiment, the area ratio of the inlet of the first injection pipe to the outlet of the first injection pipe is A, and the value range of A is 2.3:1-3:1;

The area ratio of the inlet of the second injection pipe to the outlet of the second injection pipe is B, and the value range of B is 2.5:1-3:1.

In one embodiment, the value of A is 2.7:1;

The value of the B is 2.8:1.

In one embodiment, the equivalent diameter of the first mixing section of the first injection pipe is R, and the value of R ranges from 7mm to 11mm.

In one embodiment, the value of R is 8mm.

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

the burner comprises a nozzle, a shell and a plurality of fire row assemblies according to any one of the schemes, wherein the fire row assemblies are arranged in the shell side by side, and the nozzle is opposite to the inlet of the first injection pipe.

Compared with the background technology, the burner has the beneficial effects that:

When the burner is in operation, the nozzle is arranged opposite to the inlet of the first injection pipe, high-speed gas jet ejected by the nozzle and injecting ambient air into the first injection pipe, and the gas and the first air are mixed in the first injection pipe, then are injected again into the second injection pipe through the first injection pipe, and then are mixed with the second air entering from the second injection pipe. Therefore, the fire exhaust assembly is introduced by adopting multi-stage air, the injection capacity of primary air can be enhanced, the mixing degree of fuel gas and air is greatly enhanced, the combustion efficiency and the heat load are improved, and the emission of harmful gas in smoke is reduced.

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 cross-sectional view of a fire grate assembly provided in an embodiment of the present utility model.

Description of the reference numerals:

1. A fire grate body; 11. a first ejector tube; 111. a first constriction section; 112. a first mixing section; 12. a second ejector tube; 121. a second constriction section; 122. a second mixing section; 13. a main air flow channel; 2. a combustion head; 10. and (3) a nozzle.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

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 describing 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 thus 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 above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

In the prior art, the quantity of air sucked by the injection structure of the fire grate is limited, so that the improvement of combustion efficiency, mixing capacity and smoke discharge capacity is limited.

In order to solve the above technical problems, as shown in fig. 1 and fig. 2, an embodiment of the present utility model provides a fire grate assembly, which can improve the air quantity sucked by the injection structure, and improve the combustion efficiency and the mixing capability.

As shown in fig. 1 and 2, the fire grate assembly comprises a fire grate body 1 and a combustion head 2, wherein a main air flow channel 13 is arranged in the fire grate body 1, a first injection pipe 11 and a second injection pipe 12 are arranged in the fire grate body 1 in a protruding mode to the outside, an outlet of the second injection pipe 12 is communicated with the main air flow channel 13, and an outlet of the first injection pipe 11 extends into the second injection pipe 12; the combustion head 2 is arranged at the top of the fire row body 1, and the combustion head 2 is provided with a plurality of combustion fire holes.

The high-speed gas jet ejected from the nozzle 10 and injecting ambient air into the first injection pipe 11, and the gas and the first air are mixed in the first injection pipe 11, then injected again into the second injection pipe 12 through the first injection pipe 11, and then mixed with the second air entering from the second injection pipe 12. Therefore, the fire exhaust assembly is introduced by adopting multi-stage air, the injection capacity of primary air can be enhanced, the mixing degree of fuel gas and air is greatly enhanced, the combustion efficiency and the heat load are improved, and the emission of harmful gas in smoke is reduced.

Specifically, the first ejector tube 11 includes a first constriction 111 and a first mixing stage 112, the large end of the first constriction 111 being a primary air inlet, the inlet of the first mixing stage 112 being in communication with the small end of the first constriction 111, wherein the first constriction 111 is disposed proximate the nozzle 10 and the first mixing stage 112 is disposed proximate the second ejector tube 12; the second ejector tube 12 comprises a second contraction section 121 and a second mixing section 122, the large end of the second contraction section 121 is a secondary air inlet, the small end of the second contraction section 121 is communicated with the inlet of the second mixing section 122, and the first mixing section 112 stretches into the second contraction section 121, so that when fuel gas passes through the first ejector tube 11 and the second ejector tube 12, secondary ejection is performed on the air, the ejector capacity of the air is enhanced, the mixing degree of the fuel gas and the air is enhanced, and the combustion efficiency is improved.

In order to make the length of the first ejector tube 11 into the second ejector tube 12 suitable without affecting the ejector capacity of the air by too much or too little, in some embodiments, the length of the first mixing stage 112 extending into the second constriction 121 is set to L, where L has a value in the range of 3mm to 10mm.

Alternatively, L has a value of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm. Preferably, 7mm or 8mm is chosen in this implementation.

In some embodiments, the inlet area of the first ejector 11 may range from 100mm ²-350mm². Preferably, the inlet area of the first ejector 11 is 130mm ².

In some embodiments, the ratio of the inlet of the first ejector tube 11 to the outlet area of the first ejector tube 11 is a, and the value of a ranges from 2.3:1 to 3:1; optionally, the value of a is 2.3:1, 2.4:1, 2.5:1, 2.6:1, 2.7:1, 2.8:1, 2.9:1 or 3:1, and in this embodiment, the value of a is preferably 2.7:1.

In some embodiments, the ratio of the inlet of the second ejector 12 to the outlet area of the second ejector 12 is B, which ranges from 2.5:1 to 3:1. Optionally, the value of a is 2.5:1, 2.6:1, 2.7:1, 2.8:1, 2.9:1 or 3:1, and in this embodiment, preferably, the value of B is 2.8:1.

In some embodiments, the first mixing section 112 of the first ejector tube 11 has an equivalent diameter R in the range of 7-11mm. Alternatively, R has a value of 7mm, 8mm, 9mm, 10mm or 11mm. In this embodiment, R is preferably 8mm.

Embodiments of the present utility model also provide a burner comprising a housing, a nozzle 10 and a plurality of fire grate assemblies as provided by embodiments of the present utility model, the plurality of fire grate assemblies being disposed side-by-side within the housing.

When the burner works, as the nozzle 10 is arranged opposite to the inlet of the first injection pipe 11, as shown in fig. 2, high-speed gas jet sprayed by the nozzle 10 and injecting ambient air enter the first injection pipe 11, and the gas and the first air are mixed in the first injection pipe 11, then are injected again into the second injection pipe 12 through the first injection pipe 11, and then are mixed with the second air entering from the second injection pipe 12. Therefore, the fire exhaust assembly is introduced by adopting multi-stage air, the injection capacity of primary air can be enhanced, the mixing degree of fuel gas and air is greatly enhanced, the combustion efficiency and the heat load are improved, and the emission of harmful gas in smoke is reduced.

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

1. A fire grate assembly, comprising:

The fire grate body (1), be provided with main air current passageway (13) in fire grate body (1), fire grate body (1) are protruding to outside to be equipped with first injection pipe (11) and second injection pipe (12), the export of second injection pipe (12) with main air current passageway (13) intercommunication, the export of first injection pipe (11) stretches into in second injection pipe (12).

2. The fire grate assembly of claim 1, wherein the first ejector tube (11) includes a first convergent section (111) and a first mixing section (112) in communication with a small end of the first convergent section (111), the second ejector tube (12) includes a second convergent section (121) and a second mixing section (122) in communication with a small end of the second convergent section (121), and the first mixing section (112) extends into the second convergent section (121).

3. A fire grate assembly as claimed in claim 2, wherein the length of the first mixing section (112) extending into the second constriction section (121) is L, the value of L being in the range 3mm-10mm.

4. A fire grate assembly as claimed in claim 1, wherein the inlet area of the first ejector tube (11) is in the range of 100mm ²-350mm².

5. A fire grate assembly as claimed in claim 4, wherein the inlet area of the first ejector tube (11) is 130mm ².

6. A fire grate assembly according to claim 1, wherein the ratio of the inlet of the first ejector tube (11) to the outlet area of the first ejector tube (11) is a, the value of a being in the range 2.3:1-3:1;

The area ratio of the inlet of the second injection pipe (12) to the outlet of the second injection pipe (12) is B, and the value range of B is 2.5:1-3:1.

7. A fire grate assembly as in claim 6 wherein a has a value of 2.7:1;

The value of the B is 2.8:1.

8. A fire grate assembly as claimed in claim 1, wherein the first mixing section (112) of the first ejector tube (11) has an equivalent diameter R in the range of 7mm to 11mm.

9. A fire grate assembly as claimed in claim 8 wherein R has a value of 8mm.

10. A burner comprising a nozzle (10), a housing and a plurality of fire grate assemblies as claimed in any one of claims 1 to 9, a plurality of said fire grate assemblies being arranged side by side in said housing, said nozzle (10) being arranged in facing relation to the inlet of said first ejector tube (11).