CN210320025U

CN210320025U - Full premix combustor and have its gas heater

Info

Publication number: CN210320025U
Application number: CN201920750987.7U
Authority: CN
Inventors: 侯秋庆; 高宁; 潘叶江
Original assignee: Vatti Co Ltd
Current assignee: Vatti Co Ltd
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2020-04-14
Anticipated expiration: 2029-05-23

Abstract

The utility model discloses a full premix combustor and have its gas heater, wherein full premix combustor includes: the combustor comprises a shell, a gas inlet, a combustion port and a gas outlet, wherein a premixing cavity is defined in the shell, and the gas inlet and the combustion port which are communicated with the premixing cavity are formed in the shell; the gas inlet is provided with a plurality of gas distribution nets, the gas distribution nets are arranged in the premixing cavity, and the gas distribution nets are arranged at intervals in the direction from the gas inlet to the combustion port, so that the premixing effect of gas can be improved, and the gas can be fully combusted.

Description

Full premix combustor and have its gas heater

Technical Field

The utility model relates to a water heater technical field especially relates to a full premix combustor and have its gas heater.

Background

The gas water heater is a device which takes gas as fuel and quickly prepares hot water through gas combustion, while the full premix gas water heater completely mixes the gas and air before the gas enters the gas water heater for combustion, and no secondary air participates in the gas combustion, and the gas water heater adopting the combustion mode is called as the full premix gas water heater.

The existing fully premixed gas water heater or gas wall-mounted boiler mostly adopts metal fibers as a fully premixed burner, but because the combustible mixed gas in the prior art is before the combustion of a metal fiber mesh, the airflow distribution of the combustible mixed gas is uneven due to unreasonable structure, the premixing effect is poor, so that the uneven combustible mixed gas is burnt on the surface of the metal fibers, the flame is uneven, the local flame is too high, and some metal fiber surfaces even have no flame, the uneven flame easily causes the abnormal work of the fully premixed gas water heater or gas wall-mounted boiler, or harmful combustion products CO and NOx are increased due to uneven combustion, and the environment is polluted by emission.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the problems that exist among the prior art to a certain extent at least, for this reason, an aim at provides a full premix combustor, and it can improve the premixing effect of gas, makes the gas fully burn.

The above purpose is realized by the following technical scheme:

a fully premixed combustor comprising:

the combustor comprises a shell, a gas inlet, a combustion port and a gas outlet, wherein a premixing cavity is defined in the shell, and the gas inlet and the combustion port which are communicated with the premixing cavity are formed in the shell;

the air inlet is arranged in the premixing cavity, and the air inlet is arranged at the front end of the premixing cavity and is communicated with the combustion port.

In some embodiments, an air intake passage is defined within the housing, the air intake passage being disposed between the air inlet and the premix chamber, the air intake passage having an inner diameter that is less than an inner diameter of the premix chamber.

In some embodiments, the plurality of airflow distribution networks includes a first airflow distribution network disposed at an end of the air intake passage.

In some embodiments, the first airflow distribution network comprises a bottom surface and a side surface extending from an edge of the bottom surface, and airflow distribution holes are provided in both the bottom surface and the side surface.

In some embodiments, a convex edge extending towards the outer side is arranged at the end part of the side surface far away from the bottom surface, and the convex edge is connected with the inner wall of the premixing cavity.

In some embodiments, a metal fiber mesh is disposed within the burner port.

In some embodiments, the plurality of air distribution webs includes a second air distribution web having air distribution apertures disposed thereon, the second air distribution web being disposed on or spaced apart from the metal fiber web.

In some embodiments, the housing includes an upper cover and a lower cover assembled together, the air inlet and the air inlet passage are provided on the upper cover, and the combustion port is provided on the lower cover.

In some embodiments, a fully premixed fan is connected to the air inlet.

Another object of the present invention is to provide a gas water heater, which can make the gas fully burn and reduce the environmental pollution.

The above purpose is realized by the following technical scheme:

a gas water heater comprising a fully premixed burner as described above.

Compared with the prior art, the utility model discloses an at least including following beneficial effect:

1. the utility model discloses a full premix combustor can make the air current distribution of gas become more even through a plurality of air current distribution network that add, improves the effect in advance of gas, and then makes the gas fully burn, effectively reduces harmful combustion products CO and NOx's content, does benefit to the performance that improves gas heater and reduces polluted environment.

Drawings

FIG. 1 is a schematic perspective view of a fully premixed burner in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a full premix burner according to an embodiment of the present invention.

Detailed Description

The present invention is illustrated by the following examples, but the present invention is not limited to these examples. To the embodiment of the present invention, modify or replace some technical features, without departing from the spirit of the present invention, it should be covered in the technical solution scope of the present invention.

The first embodiment is as follows: as shown in fig. 1 and 2, the present embodiment provides a fully premixed combustor including:

the gas burner comprises a shell 1, wherein a premixing cavity 100 is defined in the shell 1 and used for fully premixing gas, a gas inlet 101 and a burner port 102 which are communicated with the premixing cavity 100 are arranged on the shell 1, the gas inlet 101 is used for introducing gas, and the burner port 102 is used for burning the gas;

a plurality of air distribution nets 2, wherein the plurality of air distribution nets 2 are disposed in the premixing chamber 100, and the plurality of air distribution nets 2 are disposed at intervals in a direction from the air inlet 101 toward the burner 102.

The fully premixed burner of this embodiment can make the air current distribution of gas become more even through a plurality of air current distribution network 2 that add, improves the effect of premixing of gas, and then makes the gas fully burn, effectively reduces the content of harmful combustion product CO and NOx, does benefit to the performance that improves gas heater and reduces the polluted environment.

Furthermore, an air inlet channel 103 is defined in the housing 1, the air inlet channel 103 is arranged between the air inlet 101 and the premixing cavity 100, the inner diameter of the air inlet channel 103 is smaller than the inner diameter of the premixing cavity 100, and the air can be conveniently introduced through the arranged air inlet channel 103, and the inner diameter of the premixing cavity 100 is larger than the inner diameter of the air inlet channel 103, so that the gas entering the premixing cavity 100 has a wider premixing space, and the premixing effect of the gas can be improved.

Preferably, the plurality of airflow distribution networks 2 include a first airflow distribution network 21, the first airflow distribution network 21 is disposed at the end of the air inlet channel 103, and the gas entering the premixing cavity 100 can be primarily distributed through the arranged first airflow distribution network 21, so that the gas is uniformly distributed and premixed sufficiently.

More preferably, the first air distribution net 21 comprises a bottom surface 211 and a side surface 212 extending from the edge of the bottom surface 211, so as to improve the effect of uniform distribution and premixing of the fuel gas, and prevent the fuel gas which is not uniformly distributed and premixed by the first air distribution net 21 from entering the premixing chamber 100. The air distribution holes 200 are formed in the bottom surface 211 and the side surfaces 212, and in this embodiment, the shapes of the air distribution holes 200 may be set to be circular or strip-shaped according to design or premixing effect, and the air distribution holes may be set to be regularly distributed or irregularly distributed, so as to improve the uniform distribution effect of the gas flow.

Preferably, the end portion of the side surface 212, which is far away from the bottom surface 211, is provided with a convex edge 213 extending outward, the convex edge 213 is connected with the inner wall of the premixing chamber 100, and the convex edge 213 and the inner wall of the premixing chamber 100 can be connected together by welding or other methods.

Further, the metal fiber net 3 is provided in the combustion port 102, and the outer surface of the metal fiber net 3 serves as a combustion surface of the full premix burner, which can improve the combustion efficiency of the full premix burner.

In this embodiment, the plurality of airflow distribution networks 2 include the second airflow distribution network 22, and the gas can be redistributed through the second airflow distribution network 22, so that the gas is uniformly distributed and fully premixed, which is beneficial to improving the combustion efficiency of the gas. The second air distribution net 22 is provided with air distribution holes 200, in this embodiment, the shape of the air distribution holes 200 may be set to be circular or strip-shaped according to design or premixing effect, and the air distribution holes may be set to be regularly distributed or irregularly distributed, so as to improve the uniform distribution effect on the air flow. The second air distribution net 22 is disposed on the metal fiber net 3 or is disposed at a distance from the metal fiber net 3, and the second air distribution net 22 and the metal fiber net 3 may be fixed to the housing by welding or other means.

In this embodiment, the combustible gas will be combusted on the metal fiber web 3 after passing through the gas inlet 101, the gas inlet passage 103, the first gas flow distribution network 21, the premixing chamber 100 and the second gas flow distribution network 22, respectively.

In particular, the housing 1 includes an upper cover 11 and a lower cover 12 assembled together, the upper cover 11 is provided with an air inlet 101 and an air inlet channel 103, and the lower cover 12 is provided with the combustion port 102.

Preferably, the air inlet 101 is connected with a fully premixed fan for guiding the combustible mixed gas of air and gas into the fully premixed burner, so that the gas can be more uniformly distributed and more fully premixed, the combustion efficiency of the gas can be improved, and the content of harmful combustion products CO and NOx can be reduced.

In the fully premixed burner provided by the embodiment, the gas needs to pass through at least more than two gas flow distribution nets 2, so that after the combustible mixed gas entering the fully premixed burner is diffused to the premixing cavity 100 with a larger cross section area through the smaller gas inlet channel 103, the gas flow of the combustible mixed gas becomes relatively uniform, so that the combustion flame on the surface of the metal fiber net 3 is relatively uniform, the phenomenon of overhigh local flame or overhigh temperature can not occur, on the premise of ensuring full combustion, the contents of harmful combustion products CO and NOx are reduced, the performance of a gas water heater is improved, and the environment pollution is reduced.

The following is a detailed description of the operation principle of the fully premixed burner provided in this embodiment:

when air and gas of the gas water heater are mixed according to a certain proportion under the action of a full premixing fan and an air-fuel proportion valve, the mixed gas enters an air inlet 101 of a full premixing combustor, the gas flow passes through a first air flow distribution network 21, as the gas flow enters along an air inlet channel 103 with a smaller diameter, the air flow speed in the middle of the gas flow is higher, the gas flow with uneven local distribution is subjected to first distribution under the action of air flow distribution holes 200 densely distributed in the first air flow distribution network 21, and the gas flow speed with the too high local flow speed is reduced, so that the gas flow passing through the first air flow distribution network 21 is relatively uniform on an expansion surface; however, the gas flow passing through the first gas flow distribution net 21 is still locally distributed on the expanded surface unevenly, so that the gas flow passes through the second gas flow distribution net 22 on the metal fiber net 3, and similarly passes through the gas flow distribution holes 200 regularly arranged on the second gas flow distribution net 22 to perform secondary gas flow distribution and local speed reduction. When combustible mixed gas after twice airflow distribution and local speed reduction flows to the surface of the metal fiber net 3 for combustion, the combustible mixed gas is relatively uniformly distributed and fully premixed, so that flame burning on the surface of the metal fiber net 3 becomes more uniform, the combustion flame is prevented from being non-uniform, the local overhigh combustion temperature of a combustion cavity is avoided, and the content of CO and NOx in combustion waste gas is reduced.

Example two: the present embodiment provides a gas water heater, which includes a fully premixed burner, a fully premixed blower, a heat exchanger, a fume collecting hood, an air-fuel ratio valve, etc. as described in the first embodiment, since the fully premixed burner is fully and specifically described in the first embodiment, detailed description thereof is omitted here for brevity.

The gas water heater that this embodiment provided, it can make the gas fully burn, reduces environmental pollution.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims

1. A fully premixed combustor characterized by comprising:

the combustion chamber structure comprises a shell (1), wherein a premixing cavity (100) is defined in the shell (1), and an air inlet (101) and a combustion port (102) which are communicated with the premixing cavity (100) are formed in the shell (1);

the gas-liquid mixer comprises a plurality of gas flow distribution nets (2), wherein the gas flow distribution nets (2) are arranged in the premixing cavity (100), and the gas flow distribution nets (2) are arranged at intervals in the direction from the gas inlet (101) to the combustion port (102).

2. A full premix burner as in claim 1, characterized in that an intake passage (103) is defined in said housing (1), said intake passage (103) being disposed between said intake port (101) and said premix chamber (100), said intake passage (103) having an inner diameter smaller than the inner diameter of said premix chamber (100).

3. A fully premixed burner according to claim 2, characterized in that a first air distribution network (21) is included in said plurality of air distribution networks (2), said first air distribution network (21) being arranged at the end of said air intake channel (103).

4. A fully premixed burner according to claim 3, wherein said first air flow distribution network (21) comprises a bottom surface (211) and side surfaces (212) extending from the edges of said bottom surface (211), and wherein air flow distribution holes (200) are provided on both said bottom surface (211) and said side surfaces (212).

5. A full premix burner as in claim 4, characterized in that an outwardly extending rim (213) is provided on the end of said side surface (212) remote from said bottom surface (211), said rim (213) and the inner wall of said premix chamber (100) being connected together.

6. A fully premixed burner according to any of claims 2 to 5, characterized in that a metal fiber mesh (3) is provided inside the burner port (102).

7. A fully premixed burner according to claim 6, characterized in that said plurality of air distribution nets (2) comprises a second air distribution net (22), air distribution holes (200) being provided in said second air distribution net (22), said second air distribution net (22) being provided on said metal fiber web (3) or spaced from said metal fiber web (3).

8. A full premix burner as in claim 6, characterized in that said housing (1) comprises an upper cover (11) and a lower cover (12) assembled together, said air intake (101) and said air intake channel (103) being provided on said upper cover (11), and said burner ports (102) being provided on said lower cover (12).

9. A fully premixed burner according to any of claims 1 to 5, characterized in that a fully premixed fan is connected to said air inlet (101).

10. A gas water heater having a fully premixed burner as claimed in any one of claims 1 to 9.