CN111964104A - A burner with comb gas ring - Google Patents

Abstract

The invention discloses a burner with an air combing ring, which comprises a burner head and a fire cover, wherein the burner head is provided with a premixing cavity with an upward opening and at least two gas channels, the fire cover is provided with an air mixing cavity with a downward opening and communicated with the premixing cavity, the air combing ring positioned above an outlet of the gas channels is arranged between the premixing cavity and the air mixing cavity, the outer side of the air combing ring is abutted against or connected with the outer ring wall of the premixing cavity, and a pore for gas to pass through is reserved between the inner side of the air combing ring and the inner ring wall of the premixing cavity or the air mixing cavity. According to the invention, the gas combing ring positioned above the outlet of the gas channel is arranged between the premixing cavity of the burner and the gas mixing cavity of the fire cover, so that when gas flows upwards through the gas combing ring, the flow velocity of the gas is reduced and the flow direction of the gas is changed, the flow direction and the flow velocity of the gas flowing into the premixing cavity and the gas mixing cavity are combed, the combustion is more uniform and stable, and meanwhile, the flameout noise can be effectively inhibited.

Description

A burner with comb gas ring

technical field

The present invention relates to the technical field of cookers, in particular to a burner head used for cookers.

Background technique

The combustion system of a domestic gas stove is mainly composed of a burner head and a fire cover. The gas premixed through the gas mixing chamber of the burner head directly reaches the fire cover through the burner head gas distribution channel and burns through the fire hole. However, the existing burner is separated from the burner head. The gas velocity of the gas passage to each position of the fire cover is different, which will lead to inconsistent flame state during combustion, which will affect the combustion effect and combustion performance.

In addition, when the burner performs the flameout operation, especially the outer flame cover, generally not the entire outer flame cover is extinguished at the same time, but the flame is partially extinguished first, and then the flame is completely extinguished in a short period of time due to the complete cut-off of the gas. After the outer fire cover is partially extinguished, the local fire cover mixing chamber forms a negative pressure, and the external air is pressed from the fire hole into the outer fire cover mixing chamber. When the residual gas mixture reaches a certain proportion, it will be ignited by the still-burning fire hole, which will cause explosion, resulting in flameout noise.

SUMMARY OF THE INVENTION

The present invention aims to solve one of the problems existing in the related art at least to a certain extent. Therefore, the present invention proposes a burner with a comb gas ring, which can not only comb the burner head premixing cavity and the fire cover mixing chamber. The gas flow direction and flow rate in the air cavity make the combustion more uniform and stable, and can also effectively suppress the flameout noise.

According to a kind of burner with comb gas ring provided above, it is realized by the following technical solutions:

A burner with a comb gas ring includes a burner head and a fire cover, the burner head is provided with an upwardly open premixing cavity and at least two gas passages, the fire cover is arranged above the premixing cavity and is There is a downwardly open air mixing chamber, the air mixing chamber communicates with the premixing chamber, wherein a comb located above the outlet of the gas channel is arranged between the premixing chamber and the air mixing chamber Gas ring, the outer side of the comb gas ring abuts or connects with the outer ring wall of the premixing chamber, and there is a hole for the gas to pass between the inner side and the premixing chamber or the inner ring wall of the gas mixing chamber .

In some embodiments, the height H of the comb gas ring is 2 mm˜8 mm, and the height difference Δh between the bottom of the comb gas ring and the outlet of the gas channel is 4 mm˜6 mm.

In some embodiments, the comb gas ring is disposed inside or at the opening of the premixing chamber, and the comb gas ring includes a flow guide part arranged obliquely in the vertical direction and in the shape of an annular shape, the flow guide The outer side of the part is connected to or abuts against the outer ring wall of the premixing chamber, and a hole for gas to pass through is left between the inner side and the inner ring wall of the premixing chamber.

In some embodiments, the gas comb ring further includes a ring-shaped partition part, the lower side of the partition part is connected to the flow guide part, and the upper side extends upward into the air mixing chamber and is connected with the air mixing chamber A gap is left between the tops, and the partition portion divides the air-mixing chamber into an inner air-mixing chamber and an outer air-mixing chamber, and the outer air-mixing chamber communicates with the inner air-mixing chamber through the gap.

In some embodiments, the comb gas ring further includes a blocking part, the blocking part is a laterally arranged annular plane or an annular inclined surface arranged obliquely in a vertical direction, and one side of the blocking part is connected to the flow guide A hole for gas to pass through is left between the other side and the inner ring wall of the premixing chamber.

In some embodiments, the air comb ring further includes a partition part, the lower side of the partition part is connected to the blocking part, and the upper side extends upward into the air mixing chamber and stays between the top of the air mixing chamber There is a gap, and the partition part divides the air-mixing chamber into an inner air-mixing chamber and an outer air-mixing chamber, and the outer air-mixing chamber communicates with the inner air-mixing chamber through the gap.

In some embodiments, a convex edge extending outward is provided on the outer side of the flow guide, and the convex edge is connected to or abuts against the outer ring wall of the premixing chamber.

In some embodiments, the flow guide portion is an inclined surface or an arc surface.

In some embodiments, the outer edge of the comb ring is clamped between the outer ring wall of the gas mixing chamber and the outer ring wall of the premixing chamber.

In some embodiments, the inner side of the outer ring wall of the premixing chamber is provided with a groove that is recessed toward the inner side of the outer ring wall, and the outer side of the comb gas ring is provided with an outwardly extending mounting boss, the mounting protrusion The stage is inserted in the groove; or, the inner side of the outer ring wall of the premixing chamber is provided with a card groove extending toward the inner ring wall, and the outer edge of the comb gas ring is inserted into the card groove .

Compared with the prior art, the present invention at least includes the following beneficial effects:

The present invention is a burner with a comb gas ring, which is provided with a comb gas ring located above the outlet of the gas passage between the premixing cavity of the burner head and the gas mixing cavity of the fire cover, so that the gas flows upward through the comb When the gas ring is used, the flow rate is reduced and the flow direction is changed, which realizes the flow direction and flow rate of the gas flowing into the premixing chamber and the mixing chamber, ensuring that the gas flow rate flowing into each position of the mixing chamber is roughly the same, making the combustion more uniform and stable. At the same time, it can also achieve the effect of effectively suppressing the flameout noise.

Description of drawings

Fig. 1 is the structural exploded schematic diagram of the burner in Embodiment 1 of the present invention;

Fig. 2 is the sectional view of the burner in Embodiment 1 of the present invention, and the fire cover is hidden in the figure;

Fig. 3 is the structural representation of comb gas ring in the embodiment 1 of the present invention;

Fig. 4 is a partial enlarged view of part A in Fig. 2;

5 is a cross-sectional view of a burner in Embodiment 2 of the present invention, with a fire cover hidden in the figure;

Fig. 6 is the structural representation of comb gas ring in the embodiment 2 of the present invention;

Fig. 7 is a partial enlarged view of part B in Fig. 5;

Fig. 8 is the structural representation of comb gas ring in embodiment 3 of the present invention;

9 is a schematic structural diagram of a comb gas ring in Embodiment 4 of the present invention.

Detailed ways

The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific embodiments of the present invention or equivalent replacement of some technical features without departing from the spirit of the solution of the present invention shall all be included in the scope of the technical solution claimed in the present invention.

Example 1

The gas flow path of the outer ring of the existing burner is: after the gas flows out of the gas channel of the burner head, it is roughly divided into two parts, one part directly flows upward into the fire cover cavity, and the other part flows to the left and right sides of the gas channel outlet of the burner head. side flow. First gradually fill the outer ring air cavity of the burner head and then overflow upward to the fire cover cavity, and the gas in the fire cover cavity flows out and burns from the fire hole of the fire cover. Since the gas velocity flowing directly upward from the gas channel of the burner head is greater than the flow velocity of the gas flowing upward from the gas cavity of the outer ring of the burner head, the flow velocity of the gas flowing into each position of the fire cover cavity is different. When the existing burner performs the flameout operation, the gas flow rate of the gas channel of the burner drops sharply, and after the gas in the corresponding local fire cover cavity is burned out, the corresponding local fire hole is extinguished first, and then in a short period of time due to the gas is completely cut off and all other fire holes are turned off. During this process, a negative pressure is formed in the fire cover cavity, which causes the external air to be pressed into the fire cover cavity from the fire cover fire holes. , which is ignited by the still burning fire hole and causes explosion, resulting in flameout noise and affecting user experience.

As shown in Figures 1-4, in order to solve the above problems, this embodiment provides a burner with a comb gas ring, a burner head 1, a fire cover 2 and a comb gas ring 3, and the burner head 1 is provided with an upwardly open preheater. The mixing chamber 11 and at least two gas passages 12 communicating with the premixing chamber 11 , the mixing chamber 11 is an annular structure with an inner ring wall and an outer ring wall, and at least two gas passages 12 are uniform along the circumferential direction of the premixing chamber 11 They are arranged at intervals to ensure that the gas entering the premixing chamber 11 is relatively uniform. The fire cover 2 is arranged above the premixing chamber 11 and is provided with a downwardly open air mixing chamber 21 . The air mixing chamber 21 is an annular structure with an inner annular wall and an outer annular wall, and the air mixing chamber 21 communicates with the premixing chamber 11 . A comb gas ring 3 located above the outlet of the gas channel 12 is provided between the premixing chamber 11 and the gas mixing chamber 21 , and the combing ring 3 substantially divides the premixing chamber 11 into a lower premixing chamber 111 and an upper premixing chamber In the cavity 112, the outer side of the comb gas ring 3 abuts or connects with the outer ring wall of the premixing chamber 11, and between the inner side and the inner ring wall of the premixing chamber 11 or the gas mixing chamber 21, there is a hole 4 for gas to pass through. The mixing chamber 111 is connected with the gas channel 12 and the hole 4 respectively, and the upper premixing chamber 112 is connected with the hole 4 and the gas mixing chamber 21 respectively.

Therefore, a comb gas ring 3 located above the outlet of the gas channel 12 is added between the premixing chamber 11 and the gas mixing chamber 21, so that the gas flow path of the burner is changed. The specific gas flow path is: the gas flows from the gas channel 12 flows vertically upward, affected by the comb gas ring 3, its flow rate decreases and the flow direction changes, flows along the comb gas ring 3 and flows upward from the hole 4 into the upper premixing chamber 112 for premixing, and the gas gradually fills the upper premixing chamber. chamber 112, and then the entire upper premix chamber 112 is filled and then overflows upward to the aeration chamber 21 of the fire cover 2, so that the gas flow rate flowing into each position of the aeration chamber 21 of the burner fire cover 2 is approximately the same, and finally from the combustion The fire hole of the fire cover flows out and burns. In addition, since the flow rate of the gas flowing into the mixing chamber 21 of the burner cover 2 is approximately the same, when the burner is extinguished, the flow rate is synchronously reduced due to the gas cut off, and the residual gas inside the burner burns almost at the same time. The fire holes of the cover 2 are extinguished at the same time, and the negative pressure will not be formed in the air-mixing chamber 21 of the fire cover 2, so that the conditions for the outside air to enter the air-mixing chamber 21 of the fire cover 2 to generate explosions will not be formed. Therefore, the flameout can be effectively reduced. noise.

It can be seen that a combustor with a comb gas ring in this embodiment is provided with a comb gas ring 3 located above the outlet of the gas passage 12 between the premixing chamber 11 and the gas mixing chamber 21, and the comb gas ring 3 The outer side abuts or connects to the outer ring wall of the premixing chamber 11, and there are holes 4 for the gas to pass through between the inner side and the inner ring wall of the premixing chamber 11 or the gas mixing chamber 21, so that the gas flows upward through the comb ring 3 When the flow rate is reduced and the flow direction is changed, the flow direction and flow rate of the gas flowing into the premix chamber 11 of the burner 1 and the gas mixture chamber 21 of the fire cover 2 are combed to ensure that the gas flow rate flowing into each position of the gas mixture chamber 21 is approximately In the same way, the combustion is more uniform and stable, and at the same time, it can effectively suppress the noise of flameout and improve the user experience.

Preferably, the number of the gas passages 12 is four, and the four gas passages 12 are evenly spaced in the circumferential direction, so as to improve the uniformity of gas distribution.

Preferably, the comb gas ring 3 in this embodiment is arranged inside the premixing chamber 11 , and the height difference Δh between the bottom of the comb gas ring 3 and the outlet of the gas channel is 4 mm to 6 mm, so as to define the gaps connected through the pores 4 . The lower premixing chamber 111 and the upper premixing chamber 112 effectively ensure that both the lower premixing chamber 111 and the upper premixing chamber 112 have enough space to facilitate the gas flow from the gas channel 12 into the lower premixing chamber 111 for premixing. Mix and fill the lower premixing chamber 111, and ensure that the gas flowing into the upper premixing chamber 112 from the hole 4 first fills the upper premixing chamber 112 and then overflows into the mixing chamber 21, thereby ensuring that it flows into the mixing chamber 21 The gas flow rate at each location is roughly the same. In other embodiments, the comb gas ring 3 may be disposed at the opening of the premixing chamber 11 .

Preferably, the height H of the comb gas ring 3 is 2 mm˜8 mm, so that when the gas enters the upper premixing chamber 112 from the pores 4 , it can first fill the upper premixing chamber 112 , and then overflow to the gas mixing chamber 21 of the fire cover 2 . , to ensure that the flow velocity of the gas flowing into each position of the gas mixing chamber 21 of the fire cover 2 is substantially the same. In this embodiment, the height of the comb gas ring 3 is preferably 4.5 mm.

As shown in Figures 3-4, specifically, the comb gas ring 3 includes a guide portion 31 and a blocking portion 33 that are arranged obliquely in the vertical direction and are annular. The guide portion 31 is an annular inclined surface with a low outer side and a high inner side, And its outer side is connected to or abuts against the outer ring wall of the premixing chamber 11 , and the inner side is connected to the blocking part 33 , the blocking part 33 is a laterally arranged annular plane, and the side of the blocking part 33 away from the guide part 31 and the premixing chamber 11 . A hole 4 for gas to pass through is left between the inner ring walls. Therefore, the arrangement of the guide portion 31 can better guide the gas to flow upward to the blocking portion 33 . When the gas is transported upward and flows through the guide portion 31 , its flow direction is bent, and flows to the direction under the guidance of the guide portion 31 . The blocking part 33 , under the influence of the blocking part 33 , its flow velocity decreases and the flow direction is bent again, and flows along the bottom surface of the blocking part 33 and flows to the premixing chamber 11 in the direction toward the horizontal plane and the central axis of the premixing chamber 11 , realizing combing. The flow direction and flow rate of the gas flowing into the upper premixing chamber 112 and the gas mixing chamber 21 ensure that the gas flow rate flowing into each position of the gas mixing chamber 21 is approximately the same, so that the combustion is more uniform and stable, and at the same time, the effect of effectively suppressing the flameout noise can be achieved. .

In other embodiments, the guide portion 31 may also be an annular arc surface with a low outer side and a high inner side, so as to make the gas flowing to the blocking portion 33 flow more smoothly. The blocking portion 33 may be designed as an annular inclined surface arranged obliquely in the vertical direction.

More specifically, a convex edge 34 extending outward is provided on the outer side of the guide portion 31 , the convex edge 34 is an annular plane, and the projection of its horizontal plane covers part of the outlet of the gas channel 12 , which is connected to the side away from the guide portion 31 . Or abut against the outer ring wall of the premixing chamber 11, in this way, the gas located under the convex edge 34 will be affected by the convex edge 34 when it flows upward, so that the gas flow rate is reduced, and the flow direction becomes toward the horizontal plane and the central axis of the premixing chamber 11. , and then flows to the blocking part 33 under the guidance of the diversion part 31 . Under the limitation of the flange 34 , the diversion part 31 and the blocking part 33 , the gas flows to several turns, which further reduces the gas flow rate to the pores 4 .

Preferably, the lower side and the upper side of the guide portion 31 are integrally formed with the raised edge 34 and the blocking portion 33, respectively, so as to facilitate the rapid processing and molding of the comb ring 3, save the connection process, and avoid air leakage at the connection.

For the installation structure of the comb ring 3, it includes the following solutions:

The first solution: on the inner side of the outer ring wall of the premixing chamber 11, a plurality of grooves (not shown in the figure), which are evenly distributed along the circumferential direction and face the inner side of the outer ring wall of the premixing chamber 11, are concave. The outer side (that is, the outer side of the convex edge 34) is provided with a mounting boss (not shown in the figure) extending outward at the position of the corresponding groove, and the mounting boss is inserted into the corresponding groove, so that the comb is realized. The gas ring 3 is stably and reliably installed inside the premixing chamber 11 .

The second solution: the inner side of the outer ring wall of the premixing chamber 11 is protruded with a card groove extending toward the inner ring wall (ie, the inner ring wall of the premix chamber 11 ) direction, and the card groove can be an annular card groove, or It is composed of several sub-card slots arranged at even intervals, and the outer edge of the comb gas ring 3 (that is, the outer side of the convex edge 34 ) is inserted into the card slot, so that the comb gas ring 3 is stably and reliably installed in the premixing chamber 11 . internal.

The third solution: the comb gas ring 3 is arranged between the premixing chamber 11 and the gas mixing chamber 21, that is, at the opening of the premixing chamber 11. During installation, the outer edge of the comb gas ring 3 (that is, the outer side of the convex edge 34) It is clamped between the outer ring wall of the gas mixing chamber 21 and the outer ring wall of the premixing chamber 11, so that the comb gas ring 3 can be securely and reliably installed at the opening of the premixing chamber 11, and the comb gas ring 3 is further simplified. The installation structure can save the manufacturing materials and the processing steps of the installation structure, improve the efficiency of processing, forming and assembly, and reduce the cost.

Example 2

As shown in FIGS. 5-7 , the difference between this embodiment and Embodiment 1 is that the structure of the comb gas ring 3 is different. Specifically, the comb ring 3 further includes a partition 32, the lower side of the partition 32 is connected to the inner side of the blocking part 33, and the upper side extends upward into the air mixing cavity 21 of the fire cover 2 and leaves a gap with the top of the air mixing cavity 21. There is a gap for the gas to pass through, and the partition 32 divides the air mixing chamber 21 of the fire cover 2 into an inner air mixing chamber 211 and an outer air mixing chamber, and the outer air mixing chamber communicates with the inner air mixing chamber 211 through the gap. Preferably, the partition part 32 and the blocking part 33 are integrally formed, and other parts are the same as those in the first embodiment.

When the gas flows upwards from the outlet of the gas passage 12 into the lower premixing chamber 111 and flows upwards from the lower premixing chamber 111 to the comb gas ring 3 , the flow rate decreases due to the influence of the raised edge 34 , the guide portion 31 and the blocking portion 33 . and the flow direction is changed, so that the gas fills the lower premixing chamber 111 first, then overflows upward to the inner mixing chamber 211 through the hole 4, then crosses the upper end face of the partition 32 through the gap, flows into the outer mixing chamber, and finally flows from the fire cover 2 to the inner mixing chamber 211. The fire hole flows out and burns, which increases the number of turns of the airflow, further extends the flow path of the gas, makes the gas and air mix more uniformly, and improves the combustion more uniform and stable.

It can be seen that by adding a partition 32, the comb gas ring 3 can comb the gas flow direction and flow rate in the premixing cavity 11 of the burner 1 and the gas mixing cavity 21 of the fire cover 2, effectively reducing the flameout noise and further prolonging the gas flow rate. The flow path makes the gas and air mix more evenly, and improves the combustion more uniform and stable.

Example 3

As shown in FIG. 8 , the difference from Embodiment 1 is that the structure of the comb gas ring 3 in this embodiment is different. The outer side and the convex edge 34 are integrally formed, and the inner side and the inner ring wall of the premixing chamber of the burner head or the inner ring wall of the gas mixing chamber of the fire cover are left with the above-mentioned pores, and other parts are the same as those in the first embodiment.

It can be seen that, compared with Embodiment 1, the gas comb ring 3 of this embodiment omits the blocking portion 33, which reduces the processing procedure and difficulty of the gas comb ring 3, and is beneficial to further reduce the manufacturing cost.

Example 4

As shown in FIG. 9 , the difference from Embodiment 2 is that the structure of the comb gas ring 3 in this embodiment is different. The outer side of the flow portion 31 is integrally formed with the raised edge 34, and the inner side is integrally formed with the lower side of the partition portion 32. The upper side of the partition portion 32 extends upward into the aeration chamber of the fire cover and leaves a gap with the top of the aeration chamber. for gas to pass through. In addition, the space is left between the inner side of the partition part 32 and the inner ring wall of the burner premixing cavity and the inner ring wall of the gas mixing cavity of the fire cover, and the partition part 32 separates the gas mixing cavity of the fire cover into the inner gas mixture The cavity and the outer air-mixing cavity are communicated with the inner air-mixing cavity through the gap. Preferably, the inner and outer sides of the air guide portion 31 are respectively integrally formed with the partition portion 32 and the flange 34 , and other parts are the same as those in the second embodiment.

It can be seen that, compared with Embodiment 2, the gas comb ring 3 of this embodiment omits the blocking portion 33, reduces the processing procedure and difficulty of the gas comb ring 3, and is beneficial to further reduce the manufacturing cost.

The foregoing are merely some of the embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention.

Claims (10)

1. A burner with a comb gas ring, comprising a burner head (1) and a fire cover (2), the burner head (1) being provided with an upwardly open premixing cavity (11) and at least two gas passages ( 12), the fire cover (2) is arranged above the premixing chamber (11) and is provided with a downwardly open air mixing chamber (21), and the air mixing chamber (21) communicates with the premixing chamber (11), characterized in that a comb gas ring (3) located above the outlet of the gas passage (12) is provided between the premixing chamber (11) and the gas mixing chamber (21), so The outer side of the comb ring (3) abuts or connects with the outer ring wall of the premixing chamber (11), and the inner side is connected to the inner ring wall of the premixing chamber (11) or the gas mixing chamber (21). There are holes (4) for gas to pass through. 2 . The burner with a comb gas ring according to claim 1 , wherein the height H of the comb gas ring ( 3 ) is 2 mm to 8 mm, and the bottom of the comb gas ring ( 3 ) and the The height difference Δh of the outlet of the gas passage is 4 mm˜6 mm. 3. A burner with a comb gas ring according to claim 1 or 2, characterized in that, the comb gas ring (3) is arranged inside or at the opening of the premixing chamber (11), and The comb gas ring (3) includes a flow guide portion (31) arranged obliquely in the vertical direction and in the shape of an annular shape, and the outer side of the flow guide portion (31) is connected to or abuts against the premixing chamber (11). A hole (4) for gas to pass through is left between the outer ring wall and the inner side of the premixing chamber (11). 4 . The burner with comb gas ring according to claim 3 , wherein the comb gas ring ( 3 ) further comprises an annular partition ( 32 ), and the partition part ( 32 ) is under the The side is connected to the guide portion (31), the upper side extends upwards into the air mixing chamber (21) and leaves a gap with the top of the air mixing chamber (21), and the partition portion (32) ) divides the air mixing chamber (21) into an inner air mixing chamber (211) and an outer air mixing chamber, and the outer air mixing chamber communicates with the inner air mixing chamber (211) through the gap. 5. A burner with a comb gas ring according to claim 3, characterized in that, the comb gas ring (3) further comprises a blocking part (33), and the blocking part (33) is arranged laterally An annular plane or an annular inclined plane inclined in a vertical direction, and one side of the blocking portion (33) is connected to the flow guiding portion (31), and the other side is connected to the inner ring wall of the premixing chamber (11) There are holes (4) for gas to pass through. 6. A burner with a comb gas ring according to claim 5, wherein the comb gas ring (3) further comprises a partition (32), and the lower side of the partition (32) is connected to the The blocking portion (33) extends upwards into the air mixing chamber (21) and leaves a gap with the top of the air mixing chamber (21), and the partition (32) separates the The air mixing chamber (21) is divided into an inner air mixing chamber (211) and an outer air mixing chamber, and the outer air mixing chamber communicates with the inner air mixing chamber (211) through the gap. 7 . The burner with comb gas ring according to claim 3 , wherein a convex edge ( 34 ) extending outward is provided on the outer side of the guide portion ( 31 ), and the convex edge ( 34 ). ) is connected or abutted against the outer ring wall of the premixing chamber (11). 8 . The burner with comb gas ring according to claim 3 , wherein the flow guide portion ( 31 ) is an inclined surface or an arc surface. 9 . 9 . The burner with a comb gas ring according to claim 1 , wherein the outer edge of the comb gas ring ( 3 ) is clamped between the outer ring wall of the gas mixing chamber ( 21 ) and the between the outer ring walls of the premixing chamber (11). 10 . The burner with comb gas ring according to claim 1 , wherein the inner side of the outer ring wall of the premixing chamber ( 11 ) is provided with a recessed groove toward the inside of the outer ring wall, so the The outer side of the comb gas ring (3) is provided with a mounting boss extending outward, and the mounting boss is inserted in the groove; Alternatively, the inner side of the outer ring wall of the premixing chamber (11) is provided with a card groove extending toward the inner ring wall thereof, and the outer edge of the comb gas ring (3) is inserted into the card groove.

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