CN111256129B

CN111256129B - Burner for gas stove

Info

Publication number: CN111256129B
Application number: CN201811458856.8A
Authority: CN
Inventors: 苏慧玲
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2018-11-30
Filing date: 2018-11-30
Publication date: 2021-11-02
Anticipated expiration: 2038-11-30
Also published as: CN111256129A

Abstract

The invention relates to a burner for a gas stove, which is characterized in that: the gas mixing device comprises a base, wherein the base is provided with an inner wall and an outer wall which are arranged at intervals, the inner wall is enclosed to form a central cavity for supplying gas, the inner wall and the outer wall are enclosed to form a peripheral cavity, and a connecting body is provided with a first gas channel and a second gas channel, a first fire cover arranged above the first gas channel, a second fire cover arranged above the second gas channel and a separating piece arranged in the central cavity, wherein the separating piece can divide the central cavity into two relatively independent spaces which are respectively communicated with an inner wall area and an outer wall area of the first gas mixing chamber and the second gas mixing chamber.

Description

Burner for gas stove

Technical Field

The invention relates to a burner, in particular to a burner for a gas stove.

Background

At present, a fire cover of a gas stove generally comprises an inner ring fire cover and an outer ring fire cover, the heating mode of the fire cover to a pot body is basically a mode of combining an external annular flame and an internal annular flame, the external annular flame is far away from the center of the pot bottom relative to the internal annular flame, the external annular flame is sprayed outwards and cannot intensively heat the bottom of the pot, and the retention time of smoke formed by combustion at the pot bottom is insufficient, so that the efficiency is low and resources are wasted, in order to solve the problems, a Chinese invention patent with a patent application number of CN201310295581.1 (with an authorization publication number of CN103438453A) provides an internal injection type burner for a gas stove, which comprises a base, an injection pipe, a connecting ring, a burner head and a smoke cover, wherein the injection pipe is fixedly connected with the base, the connecting ring, the burner head and the smoke cover are arranged on the base from bottom to top, the inner wall of the burner head is provided with a plurality of fire holes uniformly distributed along the circumference, the flame of this fire hole sprays inwards, can make the flame centralized heating bottom of a boiler, and the increasing of heat efficiency, but the required secondary air of the fire hole burning of the furnace end inner wall of this kind of combustor often is not enough, and the fixed structure of current gas mixing chamber integral type is unfavorable for the cleanness of cooking utensils, especially inside and the waist shape hole in the gas mixing chamber, and the user is also more and more to the difficult clear complaint of gas mixing chamber, still easily appears heating the inhomogeneous phenomenon in bottom of a boiler.

On the other hand, the combination of the outer annular flame and the inner annular flame is adopted, for example, the combination of the outer annular flame and the inner annular flame in the Chinese utility model patent ZL201320675581.X (with the publication number of CN203608555U), which discloses an outer fire cover and a gas burner of a gas burner, comprises a top annular cover plate, an inner annular wall plate and an outer annular wall plate, wherein the top annular cover plate is provided with a plurality of lower-opening convex cavities which are protruded from the lower surface to the upper surface, the convex cavities are circularly and uniformly distributed, a gap is arranged between two adjacent convex cavities, the side surface of the convex cavity, which is positioned at the radial inner side direction of the top annular cover plate, is an involute curved surface, a lower combustion fire hole group is arranged on the inner annular wall plate between two adjacent protrusions, and an upper combustion hole group is arranged on the involute curved surface, although the structure is adopted, secondary air can be introduced from the shaft guide, and secondary air is introduced from the horizontal direction between two adjacent convex cavities, the secondary air is sufficient, the gas combustion is sufficient, and due to the injection effect of combustion hot air flow, the secondary air is sucked by the outer fire cover in a rolling mode in the horizontal direction between the two adjacent convex cavities, so that the secondary air is reasonably distributed, and meanwhile, the inner ring and the outer ring are sufficiently combusted, and further improvement is needed.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide a burner for a gas stove, which ensures reasonable distribution of secondary air required by an inner ring and an outer ring, in view of the above-mentioned prior art.

A second technical problem to be solved by the present invention is to provide a burner for a gas range, which ensures sufficient secondary air in the inner wall area of the burner, in view of the above-mentioned prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: this a combustor for gas-cooker, its characterized in that: comprises the following steps:

the base is provided with an inner wall and an outer wall which are arranged at intervals, the inner wall is encircled to form a central cavity for air supplement, and the inner wall and the outer wall are encircled to form a peripheral cavity;

the connecting body comprises a plate body, wherein a central hole aligned with the central cavity is formed in the central position of the plate body, the peripheral edge of the plate body extends in the horizontal direction and can cover the outer wall, the peripheral edge is provided with a first gas channel and a second gas channel which are vertical and communicated with the peripheral cavity, the first gas channel and the second gas channel are oppositely arranged and provided with a first interval and a second interval, the first interval forms a first supplementing channel communicated with the central cavity, and the second interval forms a second supplementing channel communicated with the central cavity;

the first fire cover is arranged on the first gas channel, and a first gas mixing chamber is formed between the first fire cover and the first gas channel;

the second fire cover is arranged above the second gas channel, and a second gas mixing chamber is formed between the second fire cover and the second gas channel; and

the separator, set up in the central cavity, the separator can with two relatively independent spaces are separated into to the central cavity, communicate respectively the inner wall region and the outer wall region of first gas mixing chamber and second gas mixing chamber.

In order to facilitate the user to control the central fire and the peripheral fire, a first partition plate is arranged in the peripheral cavity and divides the peripheral cavity into a first peripheral cavity positioned on the inner side and a second peripheral cavity positioned on the outer side.

In order to facilitate the user to control the central fire and the peripheral fire, correspondingly, a second separation plate is arranged in the first gas channel and divides the first gas channel into a first inner gas channel communicated with the first peripheral cavity and a first outer gas channel communicated with the first peripheral cavity.

Similarly, in order to facilitate the control of the central fire and the peripheral fire by the user, a third partition plate is arranged in the second fuel gas channel, and the third partition plate divides the second fuel gas channel into a second inner fuel gas channel communicated with the first peripheral cavity and a second outer fuel gas channel communicated with the second peripheral cavity.

In order to ensure reasonable distribution of secondary air required by the inner ring and the outer ring, the separator is preferably in a T shape and is provided with a horizontal part and a vertical part which are communicated with each other, two ends of the horizontal part are at least partially arranged along the length direction of the first air supplementing channel and the second air supplementing channel, the vertical part is positioned in the center of the central cavity and is provided with a first gap between the vertical part and the inner wall of the central cavity, and the first gap is communicated with the inner wall areas of the first air mixing chamber and the second air mixing chamber.

Further, the horizontal part is including horizontal baffle, horizontal baffle's outside end stretches into first tonifying qi passageway with the second tonifying qi passageway turns over upwards, horizontal baffle's lower surface with first tonifying qi passageway with all have the second clearance between the diapire of second tonifying qi passageway, the second clearance intercommunication first clearance forms mutually independent be used for to the third tonifying qi passageway of the regional tonifying qi of outer wall of first gas mixing chamber and second gas mixing chamber.

In order to supplement the secondary air in the inner wall areas of the first air mixing chamber and the second air mixing chamber more directly, the horizontal part also comprises a cover plate which is covered on the horizontal partition plate and is in an inverted U shape, and two ends of the cover plate are adjacent to the inner wall areas of the first air mixing chamber and the second air mixing chamber.

Preferably, the two vertical arms of the cover plate are provided with at least two first through holes communicated with the vertical parts along the horizontal direction. The secondary air that flows out through the first through-hole of two vertical arms of apron is direct to the regional supplementary secondary air of inner wall in first air-mixing chamber and second air-mixing chamber, and is more direct, faster.

Because the two ends of the cover plate are adjacent to the inner wall areas of the first air mixing chamber and the second air mixing chamber, the supplementary secondary air is weaker than the central areas of the first air mixing chamber and the second air mixing chamber, and in order to strengthen the supplementary force of the secondary air, the central part of the cover plate is provided with an expansion part which extends towards the inner wall areas of the first air mixing chamber and the second air mixing chamber and is basically circular. The expanded portion is closer to the central area of the inner wall areas of the first and second gas-mixing chambers.

In order to match the inner wall areas of the first fire cover and the second fire cover to form a rotary fire, the first fire cover comprises a first annular top wall, a first inner ring wall and a first outer ring wall, wherein the first inner ring wall and the first outer ring wall vertically extend downwards from the inner edge and the outer edge of the first annular top wall, a first inner fire hole which is gradually inclined outwards from inside to outside is formed in the first inner ring wall, and a first outer fire hole is formed in the first outer ring wall.

Further, the first annular top wall is provided with a fourth partition plate extending downwards, and the fourth partition plate divides the first air mixing chamber into a first air mixing chamber and a second first air mixing chamber which are positioned at the inner sides.

In order to form the rotary fire by matching the inner wall areas of the first fire cover and the second fire cover, the second fire cover comprises a second annular top wall, a second inner ring wall and a second outer ring wall, wherein the second inner ring wall and the second outer ring wall vertically extend downwards from the inner edge and the outer edge of the second annular top wall, a second inner fire hole which gradually inclines inwards is formed in the second inner ring wall from outside to inside, and a second outer fire hole is formed in the second outer ring wall.

Further, the second annular top wall is provided with a fifth partition plate extending downwards, and the fifth partition plate divides the second air mixing chamber into a first air mixing chamber and a second air mixing chamber which are positioned at the inner side.

Compared with the prior art, the invention has the advantages that the separator in the central cavity solves the phenomenon of unreasonable distribution of secondary air of the inner ring and the outer ring, on one hand, the secondary air between the inner ring and the outer ring can be prevented from being influenced by each other through the arrangement of the separator, on the other hand, the secondary air can be effectively supplemented to the two rings of the outer ring fire cover, the combustion efficiency of gas is improved, meanwhile, the separator can recycle the heat of the combustor, the secondary air can be preheated, and the heat efficiency of the combustor is improved.

Drawings

FIG. 1 is a schematic view of a burner according to an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 at one angle;

FIG. 3 is a schematic view of another angle of FIG. 1;

FIG. 4 is a schematic structural diagram of a first fire cover in an embodiment of the present invention;

FIG. 5 is a schematic view of the structure of FIG. 4 at another angle;

FIG. 6 is a schematic structural view of a second fire cover in an embodiment of the present invention;

FIG. 7 is a schematic view showing the structure of a partitioning member in the embodiment of the present invention;

FIG. 8 is a cross-sectional view of FIG. 7;

FIG. 9 is a schematic structural diagram of a base in an embodiment of the invention;

FIG. 10 is a cross-sectional view of both a base and a connector disposed on the base in an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a connector according to an embodiment of the present invention;

FIG. 12 is a cross-sectional view taken at an angle from FIG. 2 in accordance with an embodiment of the present invention;

fig. 13 is a cross-sectional view at another angle from fig. 2 in an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in FIGS. 1 to 13, the preferred embodiment of the present invention is shown. The burner for the gas stove of the embodiment comprises a base 1, wherein the base 1 is provided with an inner wall 11 and an outer wall 12 which are arranged at intervals, the inner wall 11 is enclosed to form a central cavity 111 for supplying gas, and the inner wall 11 and the outer wall 12 are enclosed to form a peripheral cavity 112; the connecting body 2 comprises a plate body, the central position of the plate body is provided with a central hole 21 aligned with the central cavity 111, the peripheral edge of the plate body extends in the horizontal direction and can cover the outer wall 12, the peripheral edge is provided with a first gas channel 22 and a second gas channel 23 which are vertical and are communicated with the peripheral cavity 112, the first gas channel 22 and the second gas channel 23 are oppositely arranged and are provided with a first interval and a second interval, the first interval forms a first gas supplementing channel 24 communicated with the central cavity 111, and the second interval forms a second gas supplementing channel 25 communicated with the central cavity 111; in order to realize the uniformity of the burner heating pan bottom, preferably, the first gas channel 22 and the second gas channel 23 are C-shaped, the first fire cover 3 is arranged on the first gas channel 22, a first gas mixing chamber 31 is formed between the first gas channel 22 and the first gas channel, the second fire cover 4 is arranged on the second gas channel 23, and a second gas mixing chamber 41 is formed between the second gas channel 23 and the second gas channel; and including setting up the separator 5 in central cavity 111, separator 5 can separate into two relatively independent spaces with central cavity 111, communicate the inner wall region and the outer wall region of first gas mixing chamber 31 and second gas mixing chamber 41 respectively, the phenomenon of the unreasonable distribution of secondary air in order to solve the inner and outer ring of separator 5 in central cavity 111 like this, can avoid the secondary air between the inner ring of first fire lid 3 and second fire lid 4 and the outer loop to influence each other through setting up of this separator 5 on the one hand, on the other hand can also carry out the benefit of secondary air to two rings fire efficiency ground in the inner ring of first fire lid 3 and second fire lid 4 and the outer loop effectively, improve gas combustion efficiency.

In order to facilitate the user to control the central fire and the peripheral fire, a first partition plate 6 is arranged in the peripheral cavity 112, the peripheral cavity 112 is divided into a first peripheral cavity 1121 and a second peripheral cavity 1122, the first peripheral cavity 1121 and the second peripheral cavity 1122 are located on the inner side, the first peripheral cavity 1121 and the second peripheral cavity 1122 can be respectively connected with a first injection pipe and a second injection pipe, so that the user is allowed to independently control the inflow of a fuel mixture entering the first injection pipe and the second injection pipe, if the sizes of the peripheral fire and the central fire are to be adjusted, the adjusting valve connected to the air inlet end of the input channel is adjusted. Correspondingly, a second partition plate 7 is arranged in the first gas passage 22, and the second partition plate 7 partitions the first gas passage 22 into a first inner gas passage 221 communicated with the first peripheral cavity 1121 and a first outer gas passage 222 communicated with the first peripheral cavity 1121. Also to facilitate user control of the center fire and the outer periphery fire, a third partition plate 8 is provided in the second gas passage 23, and the third partition plate 8 partitions the second gas passage 23 into a second inner gas passage 231 communicating with the first outer periphery cavity 1121 and a second outer gas passage 232 communicating with the second outer periphery cavity 1122. In order to ensure reasonable distribution of secondary air required by the inner ring and the outer ring of the first fire cover 3 and the second fire cover 4, the separating member 5 is preferably in a T shape and has a horizontal portion 51 and a vertical portion 52 which are communicated with each other, two ends of the horizontal portion 51 are at least partially arranged along the length direction of the first air replenishing channel 24 and the second air replenishing channel 25, the vertical portion 52 is positioned in the center of the central cavity 111, a first gap 9 is left between the vertical portion and the inner wall 11 of the central cavity 111, and the first gap 9 is communicated with the inner wall regions of the first air mixing chamber 31 and the second air mixing chamber 41. Horizontal portion 51 is including horizontal baffle in this embodiment, and the outside end of horizontal baffle stretches into first tonifying qi passageway 24 and second tonifying qi passageway 25 and turns over upwards, the lower surface of horizontal baffle with all have second clearance 10 between the diapire of first tonifying qi passageway 24 and second tonifying qi passageway 25, second clearance 10 intercommunication first clearance 9 forms the third tonifying qi passageway 101 that is used for the regional tonifying qi of outer wall to first gas mixing chamber 31 and second gas mixing chamber 41 mutually independent. The first air supply channel 24 and the second air supply channel 25 form two independent air supply channels through the separation effect of the separator 5, effectively avoid the phenomenon that the secondary air in the inner wall area of the inner ring of the first fire cover 3 and the second fire cover 4 is over left, and the secondary air in the outer wall area of the outer ring of the first fire cover 3 and the second fire cover 4 is not enough is unreasonably distributed, the secondary air is forcibly divided by the separator 5, so that the inner wall area and the outer wall area of the fire burner cover can be fully combusted, and the burner cover is particularly suitable for the fire cover with inner and outer two rings of fire, the separator 5 can avoid the mutual influence of the secondary air between the fire outlet area of the inner wall 11 and the fire outlet area of the outer wall 12 on one hand, has the function of improving the combustion efficiency of gas, meanwhile, the separator 5 can recycle the heat of the gas mixing chamber, can preheat the secondary air, and is favorable for improving the thermal efficiency of the burner, wherein the third air supply channel 101 can provide the secondary air to the second gap 10 through the central cavity 111, meanwhile, the external air can be supplemented inwards through the third air supplementing channel 101.

In order to supplement the secondary air in the inner wall areas of the first air mixing chamber 31 and the second air mixing chamber 41 more directly, the horizontal part 51 further includes a cover plate 20 in an inverted U shape covering the horizontal partition, and both ends of the cover plate 20 are adjacent to the inner wall areas of the first air mixing chamber 31 and the second air mixing chamber 41. More preferably, the two vertical arms 201 of the cover plate 20 are provided with a plurality of first through holes 2011 which are communicated with the vertical portions 52 along the horizontal direction, and the secondary air flowing out through the first through holes 2011 of the two vertical arms 201 of the cover plate 20 directly supplements the secondary air to the inner wall areas of the first air mixing chamber 31 and the second air mixing chamber 41, so that the secondary air is more directly and more quickly. Since both ends of the cover plate 20 are adjacent to the inner wall regions of the first and second

air mixing chambers

31 and 41, the supplementary secondary air is weaker than the central regions of the first and second

air mixing chambers

31 and 41, and in order to enhance the supplementary force of the secondary air, the central portion of the cover plate 20 has a substantially circular expanded portion 202 extending toward the inner wall regions of the first and second

air mixing chambers

31 and 41, and the expanded portion 202 is closer to the central regions of the inner wall regions of the first and second

air mixing chambers

31 and 41. Finally, in order to form a rotating fire by matching the inner wall areas of the first fire cover 3 and the second fire cover 4, the first fire cover 3 comprises a first annular top wall 30, a first inner ring wall 301 and a first outer ring wall 302 which vertically extend downwards from the inner edge and the outer edge of the first annular top wall 30, the first inner ring wall 301 is provided with a first inner fire hole 3011 which gradually inclines outwards from inside to outside, the first outer ring wall 302 is provided with a first outer fire hole 3021, wherein the first annular top wall 30 is provided with a fourth clapboard 50 which extends downwards, and the fourth clapboard 50 divides the first gas mixing chamber 31 into a first gas mixing chamber 311 and a second first gas mixing chamber 312 which are positioned at the inner side. In order to form a rotating fire by matching the inner wall areas of the first fire cover 3 and the second fire cover 4, the second fire cover 4 comprises a second annular top wall 40, and a second inner ring wall 401 and a second outer ring wall 402 which vertically extend downwards from the inner edge and the outer edge of the second annular top wall 40, the second inner ring wall 401 is provided with a second inner fire hole 4011 which gradually inclines inwards from outside to inside, the second outer ring wall 402 is provided with a second outer fire hole 4021, the second annular top wall 40 is provided with a fifth partition plate 60 which extends downwards, and the fifth partition plate 60 divides the second gas mixing chamber 41 into a first second gas mixing chamber 411 and a second gas mixing chamber 412 which are positioned on the inner side.

Referring to fig. 12, as described above, the path of the secondary air inside the burner (see the dashed arrow) (for simplicity, only one side of the second make-up air passage 25 is shown) is as follows, the secondary air in the central cavity 111 is then supplemented to the first and second

inner fire holes

3011 and 4011 of the first and second fire covers 3 and 4 via the vertical portion 52 of the partition 5 by means of the partition 5, and is further supplemented to the first and second

inner fire holes

3011 and 4011 more directly by the horizontal portion 51 of the partition 5, meanwhile, the vertical part 52 of the separator 5 and the first gap 9 of the central cavity 111 are used for supplementing the first outer fire hole 3021 and the second outer fire hole 4021 of the first fire cover 3 and the second fire cover 4, and the mixed primary air and fuel gas ejected by the first ejection pipe 70 and the second ejection pipe 80 finally form independently controllable inner fire and outer fire.

Claims

1. A burner for a gas cooker, characterized in that: comprises the following steps:

the air supply device comprises a base (1), wherein the base (1) is provided with an inner wall (11) and an outer wall (12) which are arranged at intervals, the inner wall (11) encloses a central cavity (111) for air supply, and the inner wall (11) and the outer wall (12) enclose a peripheral cavity (112) together;

the connecting body (2) comprises a plate body, a central hole (21) aligned with the central cavity (111) is formed in the central position of the plate body, the peripheral edge of the plate body extends in the horizontal direction and can cover the outer wall (12), a first gas channel (22) and a second gas channel (23) which are communicated with the peripheral cavity (112) are formed in the peripheral edge, the first gas channel (22) and the second gas channel (23) are vertically arranged, the first gas channel (22) and the second gas channel (23) are oppositely arranged and leave a first interval and a second interval, the first interval forms a first gas supplementing channel (24) communicated with the central cavity (111), and the second interval forms a second gas supplementing channel (25) communicated with the central cavity (111);

the first fire cover (3) is arranged above the first gas channel (22), and a first gas mixing chamber (31) is formed between the first fire cover and the first gas channel (22);

the second fire cover (4) is arranged above the second gas channel (23), and a second gas mixing chamber (41) is formed between the second fire cover and the second gas channel (2); and

the separator (5), set up in central cavity (111), separator (5) can with central cavity (111) are separated into two relatively independent spaces, and one of them independent space intercommunication first gas mixing chamber's inner wall is regional, and another independent space intercommunication second gas mixing chamber's outer wall is regional.

2. Burner for gas cooktops according to claim 1, characterized in that: a first partition plate (6) is arranged in the peripheral cavity (112), and the peripheral cavity (112) is divided into a first peripheral cavity (1121) located on the inner side and a second peripheral cavity (1122) located on the outer side by the first partition plate (6).

3. Burner for gas cooktops according to claim 2, characterized in that: a second partition plate (7) is arranged in the first gas channel (22), and the second partition plate (7) divides the first gas channel (22) into a first inner gas channel (221) communicated with the first peripheral cavity (1121) and a first outer gas channel (222) communicated with the first peripheral cavity (1121).

4. Burner for gas cooktops according to claim 3, characterized in that: a third partition plate (8) is arranged in the second gas channel (23), and the second gas channel (23) is divided into a second inner gas channel (231) communicated with the first peripheral cavity (1121) and a second outer gas channel (232) communicated with the second peripheral cavity (1122) by the third partition plate (8).

5. Burner for gas cooktops according to any one of claims 1 to 4, characterized in that: the separator (5) is T-shaped, and has a horizontal part (51) and a vertical part (52) which are communicated with each other, two ends of the horizontal part (51) are at least partially arranged along the length direction of the first air supply channel (24) and the second air supply channel (25), the vertical part (52) is positioned in the center of the central cavity (111), a first gap (9) is reserved between the inner wall (11) of the central cavity (111), and the first gap (9) is communicated with the inner wall areas of the first air mixing chamber (31) and the second air mixing chamber (41).

6. Burner for gas cooktops according to claim 5, characterized in that: horizontal part (51) is including horizontal baffle, horizontal baffle's outside end stretches into first tonifying qi passageway (24) with second tonifying qi passageway (25) turn over the book upwards, horizontal baffle's lower surface with first tonifying qi passageway (24) with second tonifying qi all has second clearance (10) between the diapire of passageway (25), second clearance (10) intercommunication first clearance (9) form mutually independent be used for to third tonifying qi passageway (101) of the regional tonifying qi of outer wall of first gas mixing chamber (31) and second gas mixing chamber (41).

7. Burner for gas cooktops according to claim 6, characterized in that: the horizontal part (51) also comprises an inverted U-shaped cover plate (20) which covers the horizontal partition plate, and two ends of the cover plate (20) are adjacent to the inner wall areas of the first air mixing chamber (31) and the second air mixing chamber (41).

8. Burner for gas cooktops according to claim 7, characterized in that: two vertical arms (201) of the cover plate (20) are provided with at least two first through holes (2011) which are communicated with the vertical parts (52) along the horizontal direction.

9. Burner for gas cooktops according to claim 8, characterized in that: the cover plate (20) has a substantially circular enlarged portion (202) at a central portion thereof, which extends toward inner wall regions of the first and second air-mixing chambers (31, 41).

10. Burner for gas cooktops according to any one of claims 6 to 9, characterized in that: the first fire cover (3) comprises a first annular top wall (30), a first inner ring wall (301) and a first outer ring wall (302), wherein the first inner ring wall (301) and the first outer ring wall (302) vertically extend downwards from the inner edge and the outer edge of the first annular top wall (30), the first inner ring wall (301) is provided with a first inner fire hole (3011) which gradually inclines outwards from inside to outside, and the first outer ring wall (302) is provided with a first outer fire hole (3021).

11. Burner for gas cooktops according to claim 10, characterized in that: the first annular top wall (30) is provided with a fourth partition plate (50) extending downwards, and the fourth partition plate (50) divides the first air mixing chamber (31) into a first air mixing chamber (311) and a second first air mixing chamber (312) which are positioned at the inner side.

12. Burner for gas cooktops according to claim 11, characterized in that: the second fire cover (4) comprises a second annular top wall (40), a second inner ring wall (401) and a second outer ring wall (402), wherein the second inner ring wall (401) and the second outer ring wall (402) vertically extend downwards from the inner edge and the outer edge of the second annular top wall (40), the second inner ring wall (401) is provided with a second inner fire hole (4011) which gradually inclines inwards from outside to inside, and the second outer ring wall (402) is provided with a second outer fire hole (4021).

13. Burner for gas cooktops according to claim 12, characterized in that: the second annular top wall (40) is provided with a fifth clapboard (60) extending downwards, and the fifth clapboard (60) divides the second air mixing chamber (41) into a first second air mixing chamber (411) and a second air mixing chamber (412) which are positioned at the inner side.