CN106765085B

CN106765085B - Burner for gas water heater

Info

Publication number: CN106765085B
Application number: CN201611123882.6A
Authority: CN
Inventors: 秦刚; 徐德明; 周高云; 茅忠群; 诸永定
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2016-12-08
Filing date: 2016-12-08
Publication date: 2022-10-21
Anticipated expiration: 2036-12-08
Also published as: CN106765085A

Abstract

The invention relates to a burner for a gas water heater, which comprises a fire grate communicated with an ejector, and is characterized in that the fire grate comprises: the mixing chamber is communicated with the ejector, and a plurality of air outlets are arranged on the side wall of the mixing chamber at intervals; the mixing chamber is sleeved in the sleeve; the space between the sleeve and the mixing chamber forms a secondary mixing chamber; a flame plate is arranged on an outlet of the sleeve, and a plurality of flame holes are arranged on the flame plate at intervals; a guide plate is further arranged between the blending chamber and the flame plate in the sleeve, and the guide plate divides the space between the blending chamber and the flame plate into a guide cavity communicated with each other and a blending cavity communicated with each flame hole. The secondary air can be supplemented for many times, and the mixed gas is uniformly mixed for many times, so that the full combustion of the gas is ensured, the combustion efficiency of the gas is improved, the generation of NOx is effectively reduced, and the environment-friendly effect is realized.

Description

Burner for gas water heater

Technical Field

The invention relates to the field of water heaters, in particular to a burner for a gas water heater.

Background

The existing gas water heaters are all common row-shaped burners, generally, when the burners work, the burning temperature is very high, the burning is often insufficient, and more CO, NOx and other gases which are harmful to human bodies are generated in the burning process. With the coming of the world energy crisis and the improvement of people's environmental awareness, the efficiency and the emission of gas appliances are required to be higher and higher, and the existing combustors can achieve low NOx combustion almost all by adopting a premixed combustion mode, so that the technical difficulty of the combustors is high, and the cost is also high.

CN201620116980.6 discloses a "gas heater and its dense-dilute burner", which includes a plurality of fire rows, each fire row includes two inner side plates, two outer side plates and a central plate group, two dense flame runners are formed between the two outer side plates and the two inner side plates, a long and narrow protrusion and a triangular protrusion are respectively arranged in the two dense flame runners, and the two dense flame runners can be used as a flow guide structure for uniformly mixing natural gas and air. The central plate group comprises two central side plates and at least one central inner plate, wherein the lower ends of the two central side plates extend outwards to form an outer convex part, and the outer convex part abuts against the adjacent inner side plates, so that a spacing space is formed between each of the two sides of the central plate group and the two inner side plates. The gas water heater can reduce combustion vibration and noise, but needs further improvement in sufficient combustion and flame holding performance.

Disclosure of Invention

The invention aims to solve the technical problem of providing a burner for a gas water heater, which has the advantages of sufficient combustion and high combustion efficiency so as to effectively reduce the generation of NOx and is environment-friendly.

The technical scheme adopted by the invention for solving the technical problems is as follows: this combustor for gas water heater, including the fire row that is linked together with the ejector, its characterized in that the fire row includes:

the mixing chamber is communicated with the ejector, and a plurality of air outlet holes are formed in the side wall of the mixing chamber at intervals;

the sleeve is sleeved outside the mixing chamber, and a secondary mixing chamber is formed in the space between the sleeve and the mixing chamber;

a flame plate is arranged on an outlet of the sleeve, and a plurality of flame holes are arranged on the flame plate at intervals;

and a flow guide plate is arranged between the mixing chamber and the flame plate in the sleeve, and divides the space between the mixing chamber and the flame plate into a communicated flow guide cavity and a mixing cavity communicated with the flame holes.

Preferably, the guide plate is of an annular structure and is connected with the side wall of the sleeve, and the guide plate inclines from outside to inside and from bottom to top.

The included angle between the guide plate and the horizontal plane can be 40 to 50 degrees. The structure can simultaneously ensure the effects of flow guiding and uniform mixing.

Preferably, the area of the through hole in the middle of the guide plate is 0.3 to 0.7 times of the area of the upper port of the sleeve. This structure can accelerate the gas mixture under the prerequisite of water conservancy diversion, and the gas mixture is diffusion speed reduction suddenly again after getting into the mixing intracavity, has not only improved the mixing degree of consistency, reduces the velocity of flow of gas mixture moreover and can provide steady flame effect, and the design of guide plate has increased the resistance of gas refluence simultaneously to avoid the tempering.

Preferably, the flame plate is of a net structure, and the air permeability is 4000 to 5500L/min ² And the upper surface of the flame plate is higher than the upper end surface of the sleeve; thus, during combustion, the flame floats on the net surface to form stable and uniform flame, and the flame tempering phenomenon caused by overlarge fire holes in the combustion process can be effectively avoided; meanwhile, the flame can be supplemented with air in the surrounding environment again during combustion, and the combustion sufficiency is further ensured.

In order to facilitate the installation of the flow guide plate and the flame plate, the outer periphery of the flame plate extends downwards to form a first annular wall surface, the outer periphery of the flow guide plate extends upwards to form a second annular wall surface, the first annular wall surface and the second annular wall surface are both fixed on the inner wall of the sleeve, and the first annular wall surface is located between the second annular wall surface and the inner wall of the sleeve.

Compared with the prior art, the burner for the gas water heater provided by the invention can introduce secondary air into the mixed gas sent by the ejector, increase the mixing amount of oxygen in the gas, and simultaneously mix the mixed gas uniformly for multiple times, so that the full combustion of the gas is ensured, the combustion efficiency of the gas is improved, the generation of NOx is effectively reduced, and the burner is environment-friendly.

Drawings

FIG. 1 is a perspective view of an assembly structure according to an embodiment of the present invention;

FIG. 2 is a perspective view of an exploded structure of an embodiment of the present invention;

fig. 3 is a longitudinal sectional view of an assembly structure of the embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the following examples of the drawings.

As shown in fig. 1 to 3, the burner for a gas water heater includes at least one fire row communicating with the injector 1. The structure of the ejector 1 can be any one of the prior arts according to requirements.

The fire grate comprises:

the mixing chamber 2 is of a closed structure, the inlet of the mixing chamber is communicated with the outlet of the ejector 1, and the mixing chamber is used for carrying out flow equalization and primary mixing on premixed gas and primary air mixed gas sent by the ejector 1; a plurality of air outlets 21 are arranged on the side wall of the blending chamber 2 at intervals.

The sleeve 3 is sleeved outside the blending chamber 2, and a secondary air mixing cavity 31 is formed in the space between the side wall of the sleeve 3 and the blending chamber 2 and used for premixing and equalizing the introduced secondary air and primary air mixture.

The flame plate 4 is arranged on the outlet of the sleeve 3, the outer periphery of the flame plate 4 extends downwards to form a first annular wall surface 42, and the first annular wall surface 42 is fixed on the inner side wall of the sleeve 3; a plurality of flame holes 41 are arranged on the flame plate 4 at intervals. The flame plate 4 in this example is a mesh structure, is made of high-temperature-resistant metal mesh, and has a permeability of 4800L/min seed ² Further mixing the gas flow flowing out, and forming combustion flame above the surface of the metal net; and the upper surface of the flame plate is slightly higher than the upper end surface of the sleeve, so that the gas is mixed into the air in the surrounding environment again during combustion, and the combustion sufficiency is further ensured.

The guide plate 5 is of an annular structure, the outer periphery of the guide plate 5 extends upwards to form a second annular wall surface 51, and the second annular wall surface 51 is fixed on the inner side wall of the sleeve 3 through the first annular wall surface 42; the guide plate 5 is positioned between the blending chamber 2 and the flame plate 4, a guide cavity 32 is formed between the guide plate 5 and the top surface of the blending chamber 2, and a blending cavity 33 communicated with each flame hole 41 is formed in a cavity between the guide plate 5 and the flame plate 4; the flow guide cavity 32 is communicated with the uniform mixing cavity 33 of each flame hole 41 through a middle through hole of the flow guide plate.

In the embodiment, the outer periphery of the guide plate is connected with the side wall of the sleeve 3, and the guide plate 5 inclines from outside to inside and from bottom to top; in this embodiment, the angle between the deflector 5 and the horizontal plane is 45 °.

The working principle of the burner for the gas water heater is described as follows:

the primary mixed gas sent by the ejector enters the mixing chamber for primary flow equalizing mixing, flows out of the air outlet and enters the secondary gas mixing chamber; air enters the secondary air mixing cavity from the lower port of the sleeve, and the air is added into the primary air mixing cavity again to form secondary air mixing.

The secondary mixed gas enters the uniform mixing cavity when passing through the flow guide cavity under the flow guide effect of the flow guide plate; after the secondary mixed gas enters the flow guide cavity, the volume is suddenly reduced, the flow speed of the mixed gas is accelerated, the mixed gas quickly enters the mixing cavity, the volume is suddenly larger, the secondary mixed gas is dispersed in the mixing cavity, the flow speed is reduced, the secondary mixed gas initially entering the mixing cavity continues the flow speed of the flow guide cavity, the secondary mixed gas impacts and stirs the fuel gas in the mixing cavity, and the uniformity of secondary mixing is further improved; the secondary mixed gas is fully mixed in the mixing cavity. The combustion is then discharged through the flame holes in the flame plate.

Because the dense pores of the metal mesh flow equalize the secondary mixed gas again, stable and uniform flame is formed on the surface of the metal mesh during combustion, air of the surrounding environment is supplemented into the fuel gas again in the combustion process, the combustion sufficiency is fully ensured, the combustion efficiency is high, the generation of flue gas such as carbon monoxide, oxynitride and the like is well inhibited, and the environment is friendly.

Claims

1. The utility model provides a combustor for gas water heater, includes the fire row that is linked together with ejector (1), its characterized in that the fire row includes:

the mixing chamber (2) is communicated with the ejector (1), and a plurality of air outlets (21) are arranged on the side wall of the mixing chamber (2) at intervals;

the sleeve (3) is sleeved outside the blending chamber (2), and a secondary mixing cavity (31) is formed in a space between the sleeve (3) and the blending chamber (2);

a flame plate (4) is arranged on the upper port of the sleeve (3), a plurality of flame holes (41) are arranged on the flame plate (4) at intervals, and the upper surface of the flame plate is higher than the upper end surface of the sleeve (3);

a flow guide plate (5) is further arranged between the blending chamber (2) and the flame plate (4) in the sleeve (3), a flow guide cavity (32) is formed between the flow guide plate (5) and the top surface of the blending chamber (2), and a blending cavity (33) communicated with the flame holes (41) is formed between the flow guide plate (5) and the flame plate (4);

the blending cavity (33) is communicated with the flow guide cavity (32);

the guide plate (5) is of an annular structure and is connected with the side wall of the sleeve (3), and the guide plate (5) is inclined from outside to inside and from bottom to top.

2. The burner for the gas water heater according to claim 1, wherein an angle between the deflector (5) and a horizontal plane is 40 to 50 °.

3. The burner for the gas water heater as claimed in claim 2, wherein the area of the middle through hole of the deflector (5) is 0.3 to 0.7 times the area of the upper port of the sleeve (3).

4. The burner for a gas water heater according to claim 2 or 3, wherein the flame plate (4) has a mesh structure and has an air permeability of 4000 to 5500l/min, which is a seed or seed ² 。

5. Burner for gas water heaters according to claim 4, characterized in that the outer periphery of the flame plate (4) extends downwards forming a first annular wall surface (42), the outer periphery of the deflector (5) extends upwards forming a second annular wall surface (51), the first annular wall surface (42) and the second annular wall surface (51) are both fixed to the inner wall of the sleeve (3), and the first annular wall surface (42) is located between the second annular wall surface (51) and the inner wall of the sleeve (3).