CN111256127B - Burner for gas stove - Google Patents

Abstract

The invention relates to a burner for a gas stove, which comprises a base with a concave cavity positioned in the center and a peripheral cavity surrounding the concave cavity, wherein the central position of the concave cavity is provided with a second injection channel with an upward and vertical opening, a first connecting body is connected with a second nozzle seat and a second connecting body arranged on the first connecting body, compared with the prior art, the burner has the advantages that the peripheral cavity in the sandwich structure of the base is communicated with the first gas channel of the first connecting body and the second gas channel of the second connecting body, the length of the gas channel in the base is increased equivalently, the mixing uniformity of gas and primary air is further increased, in addition, a second ejector is connected with the first connecting body positioned on the base through the second nozzle seat and is suspended on the concave cavity of the base and also faces the second injection channel, once the overflow enters the concave cavity of the base, the blockage of the injector cannot affect the normal use of the burner.

Description

Burner for gas stove

Technical Field

The invention relates to a burner of a gas cooker, in particular to an upper air inlet type cooker burner.

Background

At present, a complete upper air inlet type burner is used in a plurality of gas cookers, and because primary air and secondary air required by the complete upper air inlet type burner during burning are both from the upper part of a cooker panel, a chassis of the gas cooker can be completely sealed. However, the conventional burner with complete upward air intake is realized by the gap between the air mixing chamber and the base when primary air is supplemented, and therefore, the problem is that the gap exists between the air mixing chamber and the base, and after the mounting screw of the panel is mounted, the mounting screw can be seen from the outside of the burner, so that the appearance of the burner is not beautiful enough. Moreover, after a gap is formed between the base and the air mixing chamber, the overflow liquid flows into the base and the round basin-shaped main body positioned below the panel through the gap, namely the term bottom cup blocks the ejector, so that inconvenience is brought to maintenance and cleaning of a user, and the normal use of the burner is influenced if the overflow liquid cannot be removed for a long time.

Meanwhile, primary air supplemented to the upper air inlet burner from the panel enters the bottom cup by utilizing negative pressure generated by jetting gas from the nozzle, the airflow distribution of the primary air is easily uneven, the primary air coefficient is influenced to a certain extent, and the gas pressure flowing out from the fire hole formed in the circumferential direction of the outer ring fire cover or the inner ring fire cover is uneven, so that the flame of outer ring fire generated by the outer ring fire cover or the flame of inner ring fire generated by the inner ring fire cover is uneven, the flame length of the central fire and the flame of the outer ring fire are also different due to incomplete mixing of the gas and the primary air, meanwhile, the injection pipe is limited by the height of the upper air inlet burner and cannot be too long, so that the channel resistance is large, yellow flame is easily generated when the power is large, and particularly when the flame is in a small fire gear, the yellow flame is more obvious.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide a burner for a gas stove, which effectively improves the mixing uniformity of primary air and gas, 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 cause liquid overflow to block an injector, in view of the above-mentioned prior art.

The third technical problem to be solved by the present invention is to provide a burner for a gas stove, which is not easy to generate yellow flame and weak fire, in view of the above-mentioned current state of the 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 of a sandwich structure and comprises a concave cavity positioned in the center and a peripheral cavity surrounding the concave cavity, at least two through holes are formed in the top wall of the peripheral cavity along the circumferential direction, a second injection channel with an upward and vertical opening is formed in the center of the concave cavity, and the second injection channel is communicated with the peripheral cavity;

the first connecting body is arranged on the base and comprises a plate body, the plate body is provided with a central hole, the hole wall of the central hole protrudes upwards to form a circle of annular wall, an annular cavity surrounded by the annular wall corresponds to the concave cavity, at least two vertical first gas channels are arranged on the periphery of the plate body at intervals along the circumferential direction, and the lower ends of the first gas channels are supported on the top end of the hole wall of the through hole;

a second nozzle holder having a root portion connected to the annular wall of the first connecting body and a free portion extending into a central position of the annular chamber;

the second ejector is arranged on the free part of the second nozzle seat and faces the second injection channel;

the second connecting body is arranged on the first connecting body and comprises an outer ring body; and

and the second cover body is arranged on the connecting body, and a second gas mixing chamber communicated with the first gas channel and the second gas channel is formed between the second cover body and the outer ring body.

The second injection passage and the second air mixing chamber can be jointly limited in a tubular structure which extends along the axial direction of the base and is convergent-divergent, such as an axial Venturi tube, meanwhile, the radial Venturi chamber can also effectively reduce the height of the combustor, furthermore, the second injection passage is of a cylindrical structure which is opened upwards, the lower port of the first injection passage is communicated with the second air mixing chamber through the peripheral cavity, the upper port of the first injection passage is opposite to the second injector, and the lower end of the first injection passage, together with the lower surface of the concave cavity and the peripheral cavity, form a radial Venturi chamber. The second ejector draws towards the second and penetrates the passageway, then borrows the kinetic energy of gas self to carry out the premixing of primary air and gas in radial venturi chamber with primary air to the second gas mixing chamber, further mixes in the second gas mixing chamber at last, and primary air and gas after the mixing flow out through the first main fire hole and the second main fire hole of second lid at last.

Because the radial venturi chamber of first injection passageway and first gas-mixing chamber is direct to the level setting from perpendicular 90 transitions, other linking parts have been saved to reduce local resistance loss, can let gas and primary air mixture reduce resistance loss when spouting first gas-mixing chamber, inject more smoothly, smooth and smooth transition, stable in order to realize going out the fire of interior ring body, the up end of interior ring body has a plurality of interior fire recesses and the steady fire recess of interval setting around the radial shaping of circumferencial direction, first burner cap forms interior fire hole and interior steady flame hole with interior fire recess and interior steady flame recess respectively, effectively improve primary air and gas mixing degree of consistency.

In order to strengthen the connection between the first air mixing chamber and the second air mixing chamber, the nozzle device also comprises at least two connecting rods, wherein the fixed ends of the connecting rods are connected to the inner wall surface of the annular wall, and the free ends of the connecting rods extend to the center of the annular cavity and are connected to the free part of the second nozzle seat.

In order to facilitate users to use the inner ring fire and the outer ring fire, particularly in the inner part, the second connecting body is provided with an inner ring body at intervals on the inner periphery of the outer ring body, a first fire cover is arranged on the inner ring body, and a first gas mixing chamber is formed between the second connecting body and the inner ring body.

Further, the gas mixing device also comprises a transmission channel which is used for transmitting the mixed gas of the gas and the primary air in the second gas mixing chamber to the first gas mixing chamber. The inner ring fire and the outer ring fire communicate the first gas mixing chamber with the second gas mixing chamber through the transmission channel.

In order to strengthen the connection between the first air mixing chamber and the second air mixing chamber, the second connecting body is provided with at least two connecting pipes which are arranged between the first air mixing chamber and the second air mixing chamber at intervals along the circumferential direction and are used for connecting the first air mixing chamber and the second air mixing chamber.

In order to realize the function of connecting the first air mixing chamber and the second air mixing chamber by the connecting pipe and form a transmission channel, the connecting pipe is hollow so as to form the transmission channel, the first end of the connecting pipe is communicated with the first air mixing chamber, and the second end of the connecting pipe is communicated with the second air mixing chamber.

In order to prevent the overflow liquid from entering the concave cavity, the gas-liquid separator further comprises a lower sealing plate positioned below the connecting pipe, wherein the lower sealing plate partially forms the bottom wall of the connecting pipe, the peripheral edge of the lower sealing plate extends in the horizontal direction and can cover the concave cavity, and the peripheral edge of the lower sealing plate is also provided with a notch for the first gas channel and the second gas channel to pass through.

Meanwhile, in order to realize the separation between the primary air channel and the secondary air channel and prevent the mutual interference during the supplement of the primary air and the secondary air, a circle of air channel communicated with the outside is formed between the first connecting body and the second connecting body, and the lower sealing plate divides the air channel into the primary air channel positioned below the lower sealing plate and the secondary air channel positioned above the lower sealing plate.

The primary air channel may be formed by any one of the pipelines in the prior art for communicating the outside with the cavity of the base, and may also be formed in such a manner that the primary air channel is circumferentially and alternately arranged along the first connecting body, and the primary air channel is used for communicating the cavity with the outside to introduce primary air into the cavity of the base from the outside. The interval between the adjacent first fuel gas channels positioned below the lower sealing plate forms the primary air channel arranged at the interval.

Similarly, the secondary air channel can be formed by any pipeline in the prior art for communicating the outside with the air replenishing cavity, and can also be formed by the following method: an air supplementing cavity is formed between the first air mixing chamber and the second air mixing chamber, the secondary air channel is arranged along the second connecting body in a circumferential direction at intervals and is used for communicating the air supplementing cavity with the outside so as to introduce secondary air into the air supplementing cavity from the outside. Wherein the spacing between adjacent second fuel gas passages on the lower closure plate defines the spaced secondary air passages.

The first fire cover comprises a top wall and an outer ring wall which vertically or obliquely extends downwards from the outer periphery of the top wall, the outer ring wall is provided with at least two inner fire holes and inner flame stabilizing holes which are communicated with the first gas mixing chamber at intervals along the circumferential direction, the top wall horizontally and downwards extends to form a first convex ring, and the first convex ring forms a protective umbrella of the inner fire holes and the inner flame stabilizing holes.

Similarly, for the purpose of forming two annular flames at intervals inside and outside the outer ring body to achieve uniformity of the burner heating pot bottom, a plurality of main flame grooves and first main flame stabilizing grooves which are arranged at intervals are formed in the outer end face of the outer ring body in the radial direction around the circumferential direction, and the second cover body and the first main flame stabilizing grooves form first main flame holes and first flame stabilizing holes respectively.

Furthermore, at least two second main fire holes are formed in the inner side wall, located on the inner side, of the outer ring body along the circumferential direction.

In order to prevent the overflowing liquid from entering each fire hole of the outer ring body, a second convex ring and a third convex ring vertically or obliquely extend downwards from the inner side edge and the outer side edge of the second cover body so as to respectively form a protective umbrella with the first main fire hole, the first flame stabilizing hole and the second main fire hole.

Compared with the prior art, the invention has the advantages that the base has a sandwich structure, the peripheral cavity of the sandwich structure is communicated with the first gas channel of the first connecting body and the second gas channel of the second connecting body, the length of the gas channel in the base is increased, the uniformity of mixing of gas and primary air is further increased, and the kinetic energy loss can be effectively reduced, so that the flame of the upper air inlet burner is short, uniform and powerful, and the defects of yellow flame, backfire and the like can not appear, in addition, the second ejector is connected with the first connecting body on the base through the second nozzle seat and is suspended on the concave cavity of the base and also faces the second ejecting channel, once overflowing liquid enters the concave cavity of the base, the normal use of the burner cannot be influenced due to the blockage of the ejector, and meanwhile, the first connecting body is connected with the base in a detachable mode, is convenient for the maintenance and the cleanness keeping of the user.

Drawings

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

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a schematic structural diagram of a first connecting body according to an embodiment of the invention;

FIG. 4 is a schematic view of an angle in a second connector according to an embodiment of the present invention;

FIG. 5 is a schematic view of another angle of a second connector according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view at an angle of FIG. 1;

FIG. 7 is a cross-sectional view at another angle in FIG. 1;

FIG. 8 is a schematic structural view of a first fire cover in an embodiment of the present invention;

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

Detailed Description

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

As shown in fig. 1 to 9, as a preferred embodiment of the present invention, the burner for gas cookers is suitable for both conventional upper intake burners and italian savart burners in europe, and includes a base 1 having a sandwich structure, the base 1 includes a cavity 11 at the center and a peripheral chamber 12 surrounding the cavity 11, the top wall of the peripheral chamber 12 has at least two through holes 121 along the circumferential direction, and the cavity 11 has a second injection passage 111 with an upward and vertical opening at the center, the second injection passage 111 is communicated with the peripheral chamber 12, a first connecting body 5 is disposed on the base 1, the first connecting body 5 includes a plate body having a central hole 51, the central hole 51 protrudes upward to form a ring-shaped wall 511, an annular cavity 512 surrounded by the ring-shaped wall 511 corresponds to the cavity 11, and the outer periphery of the plate body is provided with at least two vertical first gas passages 513 along the circumferential direction at intervals, the lower end of the first gas channel 513 is supported on the top end of the hole wall of the through hole 121; and a second nozzle holder 9, a root of the second nozzle holder 9 is connected to the annular wall 511 of the first connecting body 5, and a free portion 901 of the second nozzle holder 9 extends into the center of the annular cavity 512, wherein a second injector 90 facing the second injection passage 111 is arranged on the free portion 901 of the second nozzle holder 9, the second connecting body 2 is arranged on the first connecting body 5, the second connecting body 2 comprises an outer ring body 22, a second cover body 4 is arranged on the connecting body, and a second gas mixing chamber 41 communicated with the first gas passage 513 and the second gas passage 221 is formed between the second cover body 4 and the outer ring body 22. The base 1 with the sandwich structure, and the peripheral chamber 12 of the sandwich structure is communicated with the first gas channel 513 of the first connector 5 and the second gas channel 221 of the second connector 2, which is equivalent to increase the length of the gas channel in the base 1, further increase the uniformity of mixing of gas and primary air, and also effectively reduce the kinetic energy loss, thereby making the flame of the upper air inlet burner short, uniform and powerful, and not generating the defects of yellow flame, backfire, etc., in addition, the second injector 90 is connected with the first connector 5 on the base 1 through the second nozzle seat 9, and is 'suspended' on the cavity 11 of the base 1, and simultaneously faces the second injection channel 111, once the overflowing liquid enters the cavity 11 of the base 1, the normal use of the burner cannot be influenced by the blockage of the injector, and simultaneously the first connector 5 is connected with the base 1 in a detachable way, is convenient for the maintenance and the cleanness keeping of the user.

In this embodiment, the second injection passage 111 and the second air mixing chamber 41 can be defined together in a tubular structure, such as an axial venturi tube, extending along the axial direction of the base 1 and converging-diffusing, and meanwhile, the radial venturi cavity 112 can also effectively reduce the height of the burner, specifically, the second injection passage 111 is a cylindrical structure opening upwards, the lower port of the first injection passage 212 is communicated with the second air mixing chamber 41 through the peripheral chamber 12, the upper port 111 of the first injection passage 212 is opposite to the second injector 90, the lower end of the first injection passage 212 and the lower surface of the concave cavity 11 and the peripheral chamber 12 form a radial venturi cavity 112, the second injector 90 faces the second injection passage 111, then primary air is premixed into the second air mixing chamber 41 through the radial venturi cavity 112 by kinetic energy of the gas itself to perform primary air and gas premixing, and finally further mixed in the second air mixing chamber 41, the mixed primary air and gas finally flow out through the first and second main fire holes 224 of the second cover body 4. Because the first channel 212 and the radial venturi chamber 112 of the first air mixing chamber 31 are directly from the vertical 90 ° to the horizontal arrangement, other connecting parts are omitted to reduce the local resistance loss, the resistance loss can be reduced when the gas and primary air mixture is injected into the first air mixing chamber 31, the injection is smoother and smoother, the upper end surface of the inner ring body 21 is formed with a plurality of inner flame grooves and flame stabilizing grooves arranged at intervals around the radial direction of the circumference, the first fire cover 3 forms the inner fire hole 331 and the inner flame stabilizing hole 3321 with the inner fire grooves and the inner flame stabilizing grooves respectively, and the mixing uniformity of the primary air and the gas is effectively improved.

In order to strengthen the connection between the first air mixing chamber 31 and the second air mixing chamber 41, the nozzle device further comprises four connecting rods 7, wherein the fixed ends 71 of the four connecting rods 7 are connected to the inner wall surface of the annular wall 511, and the free ends 72 of the four connecting rods extend to the center of the annular cavity 512 and are connected to the free part 901 of the second nozzle holder 9. In order to facilitate users to use the inner and outer annular flame, particularly, the second connector 2 is provided with an inner ring body 21 at intervals on the inner periphery of the outer ring body 22, a first flame cover 3 is provided on the inner ring body 21, a first gas mixing chamber 31 is formed between the inner ring body 21 and the second connector, and a transmission channel for transmitting the mixture of the gas and the primary air in the second gas mixing chamber 41 to the first gas mixing chamber 31 is further included, so that the inner and outer annular flame communicate the first gas mixing chamber 31 and the second gas mixing chamber 41 through the transmission channel.

In order to strengthen the connection between the first air mixing chamber 31 and the second air mixing chamber 41, the second connecting body 2 has at least two connecting pipes 70, such as four connecting pipes, arranged between the first air mixing chamber 31 and the second air mixing chamber 41 at intervals along the circumferential direction. In order to realize the function of connecting the first air mixing chamber 31 and the second air mixing chamber 41 and form a transmission channel at the same time, the connecting pipe 70 is hollow to form a transmission channel, the first end 711 of the connecting pipe 70 is communicated with the first air mixing chamber 31, and the second end 712 is communicated with the second air mixing chamber 41.

In order to prevent the overflow from entering the cavity 11, a lower sealing plate 8 is further included under the connecting pipe 70, the lower sealing plate 8 partially forms the bottom wall of the connecting pipe 70, the outer peripheral edge of the lower sealing plate 8 extends in the horizontal direction and can cover the cavity 11, and the outer peripheral edge of the lower sealing plate 8 is further provided with a notch 82 for the first fuel gas channel 513 and the second fuel gas channel 221 to pass through. Meanwhile, in order to separate the primary air passage 83 and the secondary air passage 84 and prevent mutual interference between the primary air and the secondary air when the primary air and the secondary air are supplied, a ring of air passages communicating with the outside are formed between the first connecting body 5 and the second connecting body 2, and the lower sealing plate 8 divides the air passages into the primary air passage 83 below the lower sealing plate 8 and the secondary air passage 84 above the lower sealing plate 8. The primary air passage 83 may be formed by any one of the prior art pipes for communicating the outside with the cavity 11 of the base 1, or may be formed in such a manner that the primary air passage 83 is circumferentially spaced along the first connecting body 5, and the primary air passage 83 is used for communicating the cavity 11 with the outside to introduce the primary air into the cavity 11 of the base 1 from the outside. Wherein the spacing between adjacent first gas passages 513 below the lower closure plate 8 constitutes the primary air passages 83 arranged at the above-mentioned spacing. Similarly, the secondary air channel 84 may be formed by any of the ducts in the prior art that communicate the outside with the air compensation chamber, and may be formed as follows: an air supply cavity is formed between the first air mixing chamber 31 and the second air mixing chamber 41, secondary air channels 84 are arranged at intervals along the circumferential direction of the second connecting body 2, and the secondary air channels 84 are used for communicating the air supply cavity with the outside so as to introduce secondary air into the air supply cavity from the outside. The spacing between adjacent second fuel gas passages 221 on the lower seal plate 8 forms the spaced secondary air passages 84. In order to stabilize the flame-out of the inner ring body 21, a plurality of inner flame holes 331 and inner flame stabilizing holes 3321 are formed radially around the circumferential direction in the upper end surface of the inner ring body 21. In order to prevent the overflowing liquid from entering the inner fire hole 331 and the inner flame stabilizing hole 3321, the first fire cover 3 includes a top wall 32 and an outer annular wall 33 extending vertically or obliquely downward from the outer periphery of the top wall 32, the outer annular wall 33 is circumferentially provided with at least two inner fire holes 331 and inner flame stabilizing holes 3321 communicating with the first air mixing chamber 31 at intervals, the top wall 32 is horizontally and downwardly extended with a first convex ring 321, and the first convex ring 321 forms a protective umbrella of the inner fire holes 331 and the inner flame stabilizing holes 3321. Similarly, for the purpose of forming two annular flames at intervals inside and outside the outer ring body 22 to achieve uniformity of the burner heating pan bottom, a plurality of main flame grooves 222 and first main flame stabilizing grooves 223 are formed radially around the circumferential direction on the outer end surface of the outer ring body 22 at intervals, and the second cover body 4 and the first main flame grooves 222 and the first main flame stabilizing grooves 223 form first main flame holes and first flame stabilizing holes respectively. Further, at least two second main fire holes 224 are formed in the inner side wall of the outer ring 22 along the circumferential direction. In order to prevent the overflow from entering into each fire hole of the outer ring body 22, the second and third rims 42 and 43 vertically or obliquely extend downward from the inner and outer edges of the second cover 4 to form a protective umbrella with a first main fire hole, a first flame stabilizing hole, and a second main fire hole 224, respectively.

Referring to fig. 6, as described above, the primary air and the gas required by the external fire are input into the second gas mixing chamber 41 through the second injection passage 111 located outside the base 1 and through the second injection passage 212 and the second injection passage 111, the peripheral chamber 12 of the base 1, the first gas passage 513 and the second gas passage 221, the peripheral chamber 12 of the sandwich structure is communicated with the first gas passage 513 of the first connector 5 and the second gas passage 221 of the second connector 2, which is equivalent to increasing the length of the gas passage in the base 1, further increasing the mixing uniformity of the gas and the primary air, and then the mixed gas and the primary air in the second gas mixing chamber 41 are transmitted into the second gas mixing chamber 41 through the transmission passage, and finally flow out through the internal fire hole 331 of the first fire cover 3, the internal flame stabilizing hole 3321 and the first main fire hole and the first flame hole of the second cover 4, and ignited together with the secondary air in the external environment to form an inner fire and an outer fire, and if the sizes of the outer fire and the central fire are adjusted, an adjusting valve connected to the air inlet end of the input channel is adjusted.

Claims (15)

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

the base (1) is of a sandwich structure and comprises a cavity (11) positioned at the center and a peripheral cavity (12) surrounding the cavity (11), the top wall of the peripheral cavity (12) is provided with at least two through holes (121) along the circumferential direction, a second vertical injection passage (111) with an upward opening is arranged at the central position of the cavity (11), the second injection passage (111) is communicated with the peripheral cavity (12),

the first connecting body (5) is arranged on the base (1), the first connecting body (5) comprises a plate body, the plate body is provided with a central hole (51), the hole wall of the central hole (51) protrudes upwards to form a ring of annular wall (511), an annular cavity (512) enclosed by the annular wall (511) corresponds to the concave cavity (11), at least two vertical first gas channels (513) are arranged on the periphery of the plate body at intervals along the circumferential direction, and the lower ends of the first gas channels (513) are supported on the top end of the hole wall of the through hole (121);

a second nozzle holder (9), the root of the second nozzle holder (9) being connected to the annular wall (511) of the first connecting body (5), and the free portion (901) of the second nozzle holder (9) extending into the central position of the annular chamber (512);

a second ejector (90) arranged on a free portion (901) of the second nozzle holder (9) and facing the second injection passage (111);

a second connector (2) arranged on the first connector (5), the second connector (2) comprising an outer ring (22); and

and the second cover body (4) is arranged on the connecting body, and a second gas mixing chamber (41) communicated with the first gas channel (513) and the second gas channel (221) is formed between the second cover body and the outer ring body (22).

2. Burner for gas cooktops according to claim 1, characterized in that: the second injection passage (111) is of a cylindrical structure with an upward opening, the lower port of the second injection passage (111) is communicated with the second gas mixing chamber (41) through the peripheral chamber (12), the upper port (111) of the second injection passage (111) is opposite to the second ejector (90), and a radial venturi cavity (112) is defined by the lower end of the second injection passage (111) together with the lower surface of the concave cavity (11) and the peripheral chamber (12).

3. Burner for gas cooktops according to claim 2, characterized in that: the nozzle device also comprises at least two connecting rods (7), wherein the fixed ends (71) of the connecting rods (7) are connected to the inner wall surface of the annular wall (511), and the free ends (72) of the connecting rods extend to the center of the annular cavity (512) and are connected to the free part (901) of the second nozzle seat (9).

4. Burner for gas cooktops according to claim 3, characterized in that: the second connecting body (2) is provided with an inner ring body (21) at intervals on the inner periphery of the outer ring body (22), a first fire cover (3) is arranged on the inner ring body (21), and a first air mixing chamber (31) is formed between the second connecting body and the inner ring body (21).

5. Burner for gas cooktops according to claim 4, characterized in that: the gas mixing device also comprises a transmission channel for transmitting the mixed gas of the gas and the primary air in the second gas mixing chamber (41) to the first gas mixing chamber (31).

6. Burner for gas cooktops according to claim 5, characterized in that: the second connecting body (2) is provided with at least two connecting pipes (70) which are arranged between the first air mixing chamber (31) and the second air mixing chamber (41) along the circumferential direction at intervals and are used for connecting the first air mixing chamber and the second air mixing chamber.

7. Burner for gas cooktops according to claim 6, characterized in that: the connecting pipe (70) is hollow to form the transmission channel, a first end (711) of the connecting pipe (70) is communicated with the first gas mixing chamber (31), and a second end (712) of the connecting pipe is communicated with the second gas mixing chamber (41).

8. Burner for gas cooktops according to claim 7, characterized in that: the gas burner is characterized by further comprising a lower sealing plate (8) positioned below the connecting pipe (70), wherein the lower sealing plate (8) partially forms the bottom wall of the connecting pipe (70), the outer periphery of the lower sealing plate (8) extends in the horizontal direction and can cover the concave cavity (11), and the outer periphery of the lower sealing plate (8) is further provided with a notch (82) for the first gas channel (513) and the second gas channel (221) to penetrate through.

9. Burner for gas cooktops according to claim 8, characterized in that: a circle of air channels communicated with the outside are formed between the first connecting body (5) and the second connecting body (2), and the lower sealing plate (8) divides the air channels into primary air channels (83) positioned below the lower sealing plate (8) and secondary air channels (84) positioned above the lower sealing plate (8).

10. Burner for gas cooktops according to claim 9, characterized in that: the primary air channels (83) are arranged at intervals along the circumference of the first connecting body (5), and the primary air channels (83) are used for communicating the cavity (11) with the outside so as to introduce primary air into the cavity (11) of the base (1) from the outside.

11. Burner for gas cooktops according to claim 10, characterized in that: an air supplementing cavity is formed between the first air mixing chamber (31) and the second air mixing chamber (41), the secondary air channel (84) is arranged along the second connecting body (2) in a circumferential direction at intervals, and the secondary air channel (84) is used for communicating the air supplementing cavity with the outside so as to lead secondary air into the air supplementing cavity from the outside.

12. Burner for gas cooktops according to any one of claims 4 to 11, characterized in that: the first fire cover (3) comprises a top wall (32) and an outer annular wall (33) extending downwards from the outer periphery of the top wall (32) in a vertical or inclined mode, the outer annular wall (33) is provided with at least two inner fire holes (331) and inner flame stabilizing holes (3321) which are communicated with the first air mixing chamber (31) at intervals along the circumferential direction, the top wall (32) horizontally extends downwards to form a first convex ring (321), and the first convex ring (321) forms a protective umbrella with the inner fire holes (331) and the inner flame stabilizing holes (3321).

13. The burner for a gas range according to any one of claims 1 to 11, wherein: the outer end face of the outer ring body (22) is radially formed with a plurality of main fire grooves (222) and first main fire stabilizing grooves (223) which are arranged at intervals along the circumferential direction, and the second cover body (4) and the first main fire grooves (222) and the first main fire stabilizing grooves (223) form first main fire holes and first flame stabilizing holes respectively.

14. Burner for gas cooktops according to claim 13, characterized in that: the inner side wall of the outer ring body (22) on the inner side is provided with at least two second main fire holes (224) along the circumferential direction.

15. Burner for gas cooktops according to claim 14, characterized in that: and a second convex ring (42) and a third convex ring (43) vertically or obliquely extend downwards from the inner side edge and the outer side edge of the second cover body (4) to respectively form a protective umbrella with the first main fire hole, the first flame stabilizing hole and the second main fire hole (224).

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