CN110966603A

CN110966603A - Burner for gas stove and gas stove with same

Info

Publication number: CN110966603A
Application number: CN201811154667.1A
Authority: CN
Inventors: 程永超; 郑军妹
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2018-09-30
Filing date: 2018-09-30
Publication date: 2020-04-07
Anticipated expiration: 2038-09-30
Also published as: CN110966603B

Abstract

The invention relates to a burner for a gas stove, which comprises a gas mixing chamber and a fire cover arranged on the gas mixing chamber, and is characterized in that: the outer ring wall of the fire cover partially covers the outer ring wall of the gas mixing chamber, and at least two main fire holes are formed along the circumferential direction; correspondingly, the outer ring wall is provided with at least two air outlet channels which are communicated with the air mixing chamber and the main fire holes, and a sealing section which can shield the rest of the main fire holes is formed between the adjacent air outlet channels.

Description

Burner for gas stove and gas stove with same

Technical Field

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

Background

The gas burner of the existing household gas stove comprises a gas mixing chamber, a fire cover, an injection pipe and the like, wherein the outer fire cover is placed on the gas mixing chamber, and a pot support is arranged on the outer side frame of the outer fire cover. In order to avoid the direct contact of flame with the pot support, which causes heat loss and damage to the pot support, the positions of the pot support and the fire cover are relatively fixed, namely the fire cover is relatively fixed on the gas mixing chamber, and the positions of the fire cover corresponding to the support legs of the pot support are not provided with fire holes, so that the contact of flame with the foot sheets of the pot support can be avoided. The existing measures are as in the Chinese utility model patent with the publication number of CN2784774Y, a stove core, and the Chinese utility model patent with the publication number of CN202132954U, a gas stove burner structure. In the fixing method, the positioning needle needs to be inserted into an appointed positioning needle hole to complete the relative fixing of the fire cover, when the positioning needle is not inserted into the appointed positioning needle hole in the transportation process or the user is not operated properly, the fire cover is misplaced and is not fully attached to a matching surface of the air mixing chamber, the flame burns the pot support legs to cause heat loss, meanwhile, the fire cover is not positioned in place and can cause risks of tempering, air leakage and the like, in order to avoid the problem of not-in-place positioning caused by the positioning needle, the applicant discloses a burner in a Chinese utility model with the patent number ZL201420072885.1 (with the publication number of CN203731412), the burner comprises an air mixing chamber and an outer fire cover arranged on the air mixing chamber, a plurality of bumps are arranged on the upper surface of the air mixing chamber, and the bumps correspond to the support legs of the pot support one by one; the inner part of the outer fire cover is provided with a groove with a downward opening and matched with the convex block to form a gas circulation channel, the convex block is abutted against a fire hole on the outer fire cover, and the convex block in the special part is abutted against the fire hole on the outer fire cover, so that the burning of burning flame to a pot support leg can be avoided, the heat loss is reduced, the burning efficiency of the burner is improved, meanwhile, the dangers of tempering, gas leakage and the like caused by the improper installation of the fire cover and the gas mixing chamber can also be avoided, but the convex block is arranged on the upper surface of the gas mixing chamber and still occupies a certain volume, the gas outlet speed of the fire hole adjacent to the convex block is larger than that of the fire hole far away from the convex block, and the burner needs to be further improved in order to balance the gas outlet speed of each fire hole; in addition, in order to avoid flame leaving or ignition success rate reduction of the existing burner, the thickness of the annular side wall of the fire cover is increased, so that the weight of the fire cover is correspondingly increased, meanwhile, the burner with the burner fire cover with the increased fire hole depth is adopted, the gas adaptability is mostly poor, the material waste and the manufacturing cost are correspondingly increased, how to avoid flame leaving or ignition success rate reduction under the condition that the thickness of the annular side wall of the fire cover is thinned is avoided, and the existing burner is further improved.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide a burner for a gas stove, which can balance the gas outlet speeds of the fire holes while effectively reducing the heat loss, in view of the above-mentioned prior art.

The second technical problem to be solved by the present invention is to provide a burner for a gas stove, which is not easy to separate flame while effectively reducing the wall thickness of a fire cover, in view of the above-mentioned prior art.

The third technical problem to be solved by the present invention is to provide a gas stove using the burner in view of the above prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: this a combustor for gas-cooker including:

the gas mixing chamber comprises an inner ring wall, an outer ring wall, a bottom wall and a fire cover, wherein the inner ring wall and the outer ring wall are arranged in a ring shape at intervals in a concentric mode, the bottom wall is used for connecting the inner ring wall and the outer ring wall, and the fire cover covers the inner ring wall and the outer ring wall;

the fire cover comprises an annular body, the inner side edge and the outer side edge of the annular top wall of the body respectively extend downwards to form an inner annular wall and an outer annular wall, and the inner annular wall is connected with the inner annular wall of the gas mixing chamber;

the method is characterized in that: the outer ring wall partially covers the outer ring wall, and is provided with at least two main fire holes along the circumferential direction; correspondingly, the outer ring wall is provided with at least two air outlet channels communicated with the air mixing chamber and the main fire holes, and a closed section capable of shielding the rest of the main fire holes is arranged between the adjacent air outlet channels. In order to reduce the fire pressure of the main fire hole, the first wall part of the outer ring wall, which is positioned below the air outlet channel, is partially retracted inwards in the radial direction, a first gap is formed between the first wall part and the inner surface of the outer ring wall, and the first wall part of the outer ring wall is provided with an air outlet hole communicated with the air mixing chamber at a position corresponding to the first gap.

In order to not only reduce the fire outlet pressure of the main fire hole, but also stabilize the flame and stabilize the flame hole, the outer annular wall is also provided with a flame stabilizing hole communicated with the first gap at the position corresponding to the first gap.

To better achieve the first gap, which is in fluid communication with the plenum and the main fire hole, also a flame stabilizing main fire hole is possible. Of course, the first gap can also be independently used as a buffer cavity of the flame stabilizing hole.

In order to make gas and primary air from giving vent to anger passageway flow back mixing become the gas mixture and can with main fire hole striking, give vent to anger the passageway from inside to outside downward sloping gradually, correspondingly, main fire hole from inside to outside upward sloping gradually, the two forms the V style of calligraphy. The V-shaped tip part improves the mixing uniformity of gas and air in the mixed gas, reduces the flow rate and improves the flame stabilizing performance of the main fire hole.

In order to effectively preheat the fuel gas and the primary air after flowing out of the air outlet channel, the upper surface and/or the lower surface of the air outlet channel are/is provided with a concave-convex structure to form a convex rib which is convex downwards.

Preferably, the at least two ribs extend in the radial direction, and a space is reserved between the two ribs to form a preheating channel for preheating fuel gas.

In order to facilitate the gas to enter the gas mixing chamber, at least two through holes for the gas to enter the gas mixing chamber are formed in the bottom wall along the circumferential direction.

In order to facilitate the outer ring wall to partially cover the outer ring wall, the outer ring wall is more convex upward than the inner ring wall.

In order to enable mixed gas formed by gas and primary air flowing out of the gas outlet channel to be capable of colliding with the outer ring wall in multiple ways, a second gap is formed between the top end of the outer ring wall and the annular top wall of the fire cover. Get into the second clearance after flowing from air outlet channel through gas and primary air for the gas gets more even and reentrant after mixing with primary air and turns back in the air outlet channel, then enters main fire hole, has further improved the steady flame performance in main fire hole.

The invention provides a gas stove for solving the third technical problem, which further comprises a pot support, wherein the pot support is provided with a pot support leg corresponding to the closed section of the outer ring wall of the gas mixing chamber.

Compared with the prior art, the invention has the advantages that the air outlet channel arranged on the outer ring wall of the gas mixing chamber and the design of the closed section are arranged, the position of the closed section corresponding to the pot support leg is abutted against the main fire hole of the fire cover, so that the burning of flame to the pot support leg can be avoided, the heat loss is reduced, the combustion efficiency of the combustor is improved, when a user carries out disassembly and assembly, the fire cover is only required to be placed on the gas mixing chamber at will, the correct matching position of the fire cover and the gas mixing chamber can be realized without the conventional positioning mode of a positioning needle and a positioning hole, and on the other hand, the air outlet channel is in a strip seam shape, so that the condition that the air outlet speed of the main fire hole is too high to cause flame; meanwhile, the air outlet speed of the main fire holes on the two sides of the closed section can be balanced; the outer ring wall partially covers outside the outer ring wall of the gas mixing chamber, so that on one hand, the wall thickness of the fire cover can be effectively reduced, and accordingly the weight of the fire cover is correspondingly reduced, the depth of the main fire hole can be correspondingly reduced, and the main fire hole is not easily blocked by overflowing liquid.

Drawings

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

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic structural diagram of a gas mixing chamber according to an embodiment of the present invention;

FIG. 4 is a schematic view of an angle of the fire cover according to an embodiment of the present invention;

FIG. 5 is an enlarged view of the structure at A in FIG. 4;

FIG. 6 is a schematic view of another angle of the fire cover in the embodiment of the present invention;

FIG. 7 is a cross-sectional view of a fire lid in accordance with 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 7, the preferred embodiment of the present invention is shown. The burner for the gas stove in the embodiment comprises a gas mixing chamber 1 and a fire cover 2 connected to the gas mixing chamber 1, wherein the fire cover 2 comprises an annular body 21, and the inner edge and the outer edge of an annular top wall 213 of the fire cover body 21 respectively extend downwards to form an inner annular wall 211 and an outer annular wall 212; correspondingly, the lower surface of the annular top wall 213 of the fire lid 2 has a relatively isolated fire transfer chamber 3 in the air mixing chamber 1, and the fire transfer chamber 3 includes an inner opening 31 opened on the inner annular wall 211 and facing the center of the fire lid body 21, a first outer opening 32 opened on one wall of the fire transfer chamber 3 opposite to the outer annular wall 212, an air passage opened on the annular top wall 213 of the fire lid 2 and communicating with the fire transfer chamber 3, an air inlet hole 33 opened on at least one other wall of the fire transfer chamber 3 and communicating with the air mixing chamber 1, and a main fire hole 2121 opened on the outer annular wall 212 at a position corresponding to the first outer opening 32 of the fire transfer chamber 3, the present invention hides the fire transfer chamber 3 in the fire lid body 21 and relatively isolated from the air mixing chamber 1, so that the damper can be opened large, so that the amount of primary air entering the air inlet hole 33 and the fire transfer chamber 3 is increased and the velocity is increased, thereby more entrainment of secondary air into the fire transfer chamber 3, meanwhile, the bottom 37 of the fire transfer chamber 3 is hidden in the fire cover body 21, so that the overflow liquid can be effectively prevented from entering the fire transfer chamber 3. The gas mixing chamber 1 comprises an inner ring wall 11, an outer ring wall 12 and a bottom wall 13 connecting the inner ring wall 11 and the outer ring wall 12, which are arranged in a ring shape and concentrically at intervals, the inner ring wall 211 of the fire cover 2 is jointed with the inner ring wall 11 of the gas mixing chamber 1, the outer ring wall 212 partially covers the outer ring wall 12, correspondingly, the outer ring wall 12 has a plurality of gas outlet channels 121 which are arranged at intervals along the circumferential direction and are communicated with the gas mixing chamber 1 and the main fire holes 2121, the first outer side opening 32 is in fluid communication with the gas outlet channels 121, and the design of the gas mixing chamber 1 has the following advantages: firstly, an air outlet channel 121 arranged on the outer ring wall 12 of the air mixing chamber 1 and a closed section 100 are designed, the position of the closed section 100 corresponding to the pot support leg is propped against a main fire hole 2121 of the fire cover 2, thus avoiding the burning of flame to the pan support leg, reducing the heat loss, improving the combustion efficiency of the burner, when a user carries out disassembly and assembly, the fire cover 2 is only required to be placed on the gas mixing chamber 1 at will, and the fire cover 2 and the gas mixing chamber 1 can be positioned at a correct matching position without a conventional positioning mode of a positioning needle and a positioning hole, and on the other hand, because the gas outlet channel 121 is in a strip seam shape, the first outer side opening 32 of the fire transfer chamber 3 is in fluid communication with the gas outlet channel 121, so that on one hand, the phenomenon that the gas outlet speed of the main fire holes 2121 is too high, flame separation is caused, the stability of fire transfer is improved, and meanwhile, the gas outlet speed of the main fire holes 2121 on two sides of the closed section 100 can be balanced; the outer ring wall 212 partially covers the outer ring wall 12 of the gas mixing chamber 1, which can effectively reduce the wall thickness of the fire cover 2 and accordingly reduce the weight of the fire cover 2, and the depth of the main fire holes 2121 can be correspondingly reduced, so that the main fire holes 2121 are not easily blocked by spilled liquid.

In order to make the gas and the primary air flow out from the gas outlet channel 121 and enter the second gap 8, so that the gas and the primary air are mixed more uniformly and then enter the gas outlet channel 121 and then enter the main fire holes 2121 to further improve the flame stabilizing performance of the main fire holes 2121, a second gap 8 is formed between the top end of the outer ring wall 12 and the annular top wall 213 of the fire cover 2, wherein in order to make up for the problem of insufficient air brought by the fact that the fire transfer chamber 3 is hidden in the gas mixing chamber 1, the air channel is an air inlet 2131 which is formed along the circumferential direction of the annular top wall 213 of the fire cover 2 and is communicated with the second gap 8. Meanwhile, the air channel is simple in arrangement mode and communicated with the second gap 8, and the second gap 8 also stores gas and primary air flowing out of the air outlet channel 121, so that the gas, the primary air and external secondary air are mixed in the first gap 4, the air quantity of the fire transfer chamber 3 hidden in the air mixing chamber 1 is improved, and effective fire transfer of the fire transfer chamber 3 is guaranteed. The fire transfer chamber 3 hidden in the gas mixing chamber 1 of the present embodiment includes a bottom 37, a first wall 34 adjacent to the main fire hole 2121 and spaced from the outer annular wall 212 of the main fire hole 2121, a second wall 35 and a third wall 36 connecting the bottom 37 and the first wall 34 and extending to the inner annular wall 211, the first outer opening 32 is formed in the first wall 34, and the gas inlet hole 33 is formed in the bottom 37. In order to realize that the fire chamber 3 has both an open type fire transfer mode and a hidden type fire transfer mode, the second wall portion 35 and the third wall portion 36 extend to the upper surface of the fire cover body 21 to form a second side wall 351 and a third side wall 361 respectively, a top wall 360 is connected between the second side wall 351 and the third side wall 361, the top wall 360 is radially provided with a first fire ignition slot 5, an outer side port 51 of the first fire ignition slot 5 is arranged on the outer ring wall 212, an inner side port 52 of the first fire ignition slot 5 faces to the center of the fire cover body 21, of course, the open type first fire ignition slot 5 and the fire chamber 3 can independently transfer fire, or the open type first fire ignition slot 5 and the fire transfer chamber 3 can be crossed, and for this reason, the air inlet 2131 of the air passage is crossed with the first fire ignition slot 5. Since the thickness of the fire transfer chamber 3 is thicker, and the wall thickness of the fire cover 2 is thinner due to the arrangement of the air outlet channel 121 of the air mixing chamber 1, the air inlet 2131 of the air channel intersects with the first ignition slot 5, and another advantage can be brought, so that the wall thickness of the fire cover 2 and the wall thickness of the fire transfer chamber 3 have a better transition.

Because the bottom 37 of passing fire room 3 is hidden in fire lid body 21, can effectively avoid the overflow to get into in passing fire room 3, even first ignition slot 5 is stopped up, can also guarantee to hide the biography fire of passing fire room 3 bottom 37 in fire lid body 21, guarantee promptly to pass the flame burning in fire room 3, can effectively prevent the jam of hot water again, the suitability reinforcing to the air door aperture simultaneously, also can guarantee to pass the fire performance promptly under the great condition of air door aperture. In order to better make the secondary air and the fuel gas in the first ignition groove 5 be mixed more uniformly, the cross section of the cavity surrounded by the inner side opening 52 of the first ignition groove 5 is formed by intersecting two concentric circles or two ellipses similar to circles. Preferably, the groove bottom of the first priming groove 5 is also communicated with the gas mixing cavity through a transmission channel independent from the fire transfer chamber 3. This design has two benefits: the transmission channel can be used as a reinforcing rib for enhancing the overall strength of the fire transmission chamber 3; on the other hand, the connection between the first ignition groove 5 of the open type fire transfer and the hidden type fire transfer structure can be skillfully realized. And from the viewpoint of simple structure and compact structure of the whole fire transfer chamber 3, the transmission channel is an axial pipeline 6 which has a circumferential closed circumferential wall and penetrates through the fire transfer chamber 3, an opening 61 of the axial pipeline 6 is arranged on the bottom 37 of the fire transfer chamber 3, and an outlet 62 of the axial pipeline 6 is arranged on the bottom of the first ignition groove 5. In order to realize the quick fire transfer of the fire transfer chamber 3 hidden in the gas mixing chamber 1, the bottom 37 of the fire transfer chamber 3 is provided with second ignition grooves 7 communicated with the air inlets 33 on both sides of the transmission channel. In order to further reduce the fire transfer resistance of the second ignition slot 7, the fire transfer of the second ignition slot 7 is quicker; the first wall portion 34 is opened with a second outside opening 340 at a position corresponding to the second ignition slot 7. Meanwhile, in order to realize that the fire of the second ignition slot 7 just comes out of the outer ring wall 212 after passing through the gas mixing chamber 1, the first wall surface 120 of the outer ring wall 12 below the gas outlet channel 121 is partially retracted inwards along the radial direction, a first gap 4 is formed between the first wall surface 120 and the inner surface of the outer ring wall 212, the first wall surface 120 of the outer ring wall 12 is provided with a gas outlet hole 1201 which is in fluid communication with the second outer side opening 340 at a position corresponding to the first gap 4, and the outer ring wall 212 is provided with a flame stabilizing hole 2120 which is communicated with the first gap 4. The flame stabilizing hole 2120 also serves as an ignition hole to realize another ignition channel, so that the ignition success rate is effectively improved.

To achieve the purpose that the second gap 8 also has a flame-stabilizing main fire hole 2121, the first gap 4 is in fluid communication with the gas mixing chamber 1 and the main fire hole 2121. Of course, the first gap 4 can also be independently used as a "buffer chamber" of the flame-stabilizing hole 2120, depending on the staggered position of the fire cover 2 and the air outlet channel 121 of the air mixing chamber 1. Wherein, the air outlet channel 121 of gas mixing chamber 1 is from inside to outside downward sloping gradually, correspondingly, the main fire hole is from inside to outside upward sloping gradually, the two forms the V style of calligraphy, mix the gas mixture ability and main fire hole 2121 striking after in order to make gas and primary air flow out from air outlet channel 121, the tip portion of V style of calligraphy, the mixing uniformity of gas and air in the gas mixture has been improved, the velocity of flow has been reduced again simultaneously, the steady flame performance in main fire hole has been improved, and air outlet channel 121's upper surface and lower surface still have concave-convex structure and form downward bellied protruding muscle 9, so that gas and primary air can be effectively preheated after flowing out from air outlet channel 121, preferentially, protruding muscle 9 has many and is radial extension, leave the interval in order to form the preheating channel who is used for preheating the gas between two protruding muscle 9. Finally, in order to facilitate the gas to enter the gas mixing chamber 1, the bottom wall 13 is circumferentially provided with at least two through holes 131 for the gas to enter the gas mixing chamber 1, and in order to facilitate the outer ring wall 212 to partially cover the outer ring wall 12, the outer ring wall 12 is more protruded upwards than the inner ring wall 11.

As described above, the flame transfer path of the primary air, the gas, the mixed gas after mixing and the secondary air in the flame transfer chamber 3 inside the gas mixing chamber 1 is divided into three paths, the first path is that the flame transfer chamber 3 transfers flame in the gas mixing chamber 1, specifically, the gas and the primary air enter the flame transfer chamber 3 through the air inlet 33, and are sucked into the secondary air through the air inlet 2131 and then flow out through the second pilot burner 7, the second outer side opening 340, the second gap 8 and the flame stabilizing hole 2120 corresponding to the outer annular wall 212 of the flame cap 2, so that the air flow velocity of the mixed gas flowing out from the transverse flame transfer chamber 3 is effectively reduced, the gas at the flame transfer chamber 3 is not easy to leave flame during combustion, and the ignition of the burner is more stable; and a second path: the first flame transfer groove at the top of the flame transfer chamber 3 can flow out of the main flame holes 2121 after turning through a V-shaped channel formed between the air outlet channel 121 of the outer ring wall 12 of the gas mixing chamber 1 and the main flame holes 2121, so that the air flow velocity of the mixed gas flowing out of the first flame initiation groove 5 is effectively reduced, the gas at the first flame initiation groove 5 is not easy to leave flame during combustion, and the ignition of the combustor is more stable; and a third path: for the fire transfer chamber 3 and the first kindling groove 5 on the top of the fire transfer chamber 3 to cross and transfer fire, the mixed gas flowing out from the first outside opening 32 and the second outside opening 340 of the fire transfer chamber 3 crosses with the first kindling groove 5 through the air inlet 2131 of the air channel, after forming the cross, the mixed gas can flow out from the main kindling hole 2121 after turning through the V-shaped channel formed between the air outlet channel 121 of the outer ring wall 12 of the air mixing chamber 1 and the main kindling hole 2121, further effectively reducing the air velocity when the mixed gas flows out from the first kindling groove, and the cross formation can make the fire transfer performance of the fire transfer chamber 3 more stable.

The invention also provides a gas stove, which further comprises a pot support, wherein the pot support is provided with a pot support leg corresponding to the closed section 100 of the outer ring wall 12 of the gas mixing chamber 1.

Claims

1. A burner for a gas range, comprising:

the gas mixing chamber (1) comprises an inner ring wall (11), an outer ring wall (12) and a bottom wall (13) which connects the inner ring wall (11) and the outer ring wall (12) which are arranged in a ring shape at intervals concentrically, and a fire cover (2) which covers the inner ring wall (11) and the outer ring wall (12);

the fire cover (2) comprises an annular body (21), the inner edge and the outer edge of an annular top wall (213) of the body (21) respectively extend downwards to form an inner annular wall (211) and an outer annular wall (212), and the inner annular wall (211) is jointed with the inner annular wall (11) of the gas mixing chamber (1);

the method is characterized in that: the outer ring wall (212) partially covers the outer ring wall (12) and is provided with at least two main fire holes along the circumferential direction; correspondingly, the outer ring wall (12) is provided with at least two air outlet channels (121) which are communicated with the air mixing chamber (1) and the main fire holes (2121), and the outer ring wall (12) is provided with a closed section (100) which can shield the rest of the main fire holes between the adjacent air outlet channels (121).

2. Burner for gas cooktops according to claim 1, characterized in that: the first wall part (34) of the outer ring wall (12) below the air outlet channel (121) is partially retracted inwards in the radial direction, a first gap (4) is formed between the first wall part (34) and the inner surface of the outer ring wall (212), and an air outlet hole (1201) communicated with the air mixing chamber (1) is formed in the position, corresponding to the first gap (4), of the first wall part (34) of the outer ring wall (12).

3. Burner for gas cooktops according to claim 2, characterized in that: and the outer ring wall (212) is also provided with a flame stabilizing hole (2120) communicated with the first gap (4) at the position corresponding to the first gap (4).

4. Burner for gas cooktops according to claim 2 or 3, characterized in that: the first gap (4) is in fluid communication with the gas mixing chamber (1) and the main fire hole (2121).

5. The burner for a gas range according to any one of claims 1 to 3, wherein: the air outlet channel (121) is gradually inclined downwards from inside to outside, correspondingly, the main fire hole is gradually inclined upwards from inside to outside, and the main fire hole form a V shape.

6. Burner for gas cooktops according to claim 5, characterized in that: the upper surface and/or the lower surface of the air outlet channel (121) is provided with a concave-convex structure to form a convex rib (9) which is convex downwards.

7. Burner for gas cooktops according to claim 6, characterized in that: the at least two convex ribs (9) extend in the radial direction, and a space is reserved between the two convex ribs (9) to form a preheating channel for preheating fuel gas.

8. Burner for gas cooktops according to claim 7, characterized in that: and at least two through holes (131) for gas to enter the gas mixing chamber (1) are formed in the bottom wall (13) along the circumferential direction.

9. Burner for gas cooktops according to any one of claims 6, 7 or 8, characterized in that: the outer ring wall (12) is more convex upward than the inner ring wall (11).

10. Burner for gas cooktops according to claim 9, characterized in that: a second gap (8) is arranged between the top end of the outer ring wall (12) and the annular top wall (213) of the fire cover (2).

11. A gas cooker with a burner as claimed in any one of claims 1 to 10, further comprising a pan support having pan support legs corresponding to the closed section (100) of the outer wall (12) of the gas mixing chamber.