CN113531590A

CN113531590A - Burner for gas stove

Info

Publication number: CN113531590A
Application number: CN202010297157.0A
Authority: CN
Inventors: 史丽莎; 朱志新; 茅忠群; 诸永定; 蔡国汉
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-04-15
Filing date: 2020-04-15
Publication date: 2021-10-22

Abstract

The invention relates to a burner for a gas stove, which comprises a burner body with a first gas chamber, a gas pipe communicated with the first gas chamber and a mesh type fire cover covering an open mouth part of the burner body, and is characterized in that: the invention has the advantages that the adjacent first gas chambers and the second gas chamber positioned between the adjacent first gas chambers are divided into an inner ring, a middle ring and an outer ring for independent gas supply, the inner ring and the outer ring are used for infrared combustion to inject excessive primary air, the redundant primary air and the secondary air supplement chamber can supply secondary air to the second gas chamber positioned in the middle ring together after the requirement of self infrared combustion is met, and the excessive smoke generated by insufficient secondary air in the middle ring can be avoided.

Description

Burner for gas stove

Technical Field

The invention relates to the technical field of household kitchen utensils, in particular to a burner for a gas stove.

Background

At present, although secondary air is not needed in the combustion of the infrared combustor on the market, primary air is completely injected and provided by nature, but the volume is heavy in order to ensure that gas and air are mixed fully and uniformly, a longer mixing pipe or a very large mixing cavity is needed, so that the diameter of a combustion disc is larger than that of an atmospheric combustor, about 150mm, and the actual thermal efficiency of a small sharp-bottomed pot is greatly reduced. And although the thermal efficiency of the infrared burner is higher than that of an atmospheric burner, the increase of the thermal load needs to be multiplied by the diameter of the burner, and the infrared burner cannot meet the civil requirement. Therefore, the heat flow of the burner is only about 3.5kW, and the heat flow is not suitable for the habit of fiercely frying and stir-frying by Chinese people, so the market occupancy is small.

In order to meet the cooking habit of the people in China, the existing infrared burner forms half-infrared half-atmosphere combustion by adding an atmosphere burner at the outer side or the inner side of the burner so as to improve the heat load, for example, the infrared atmosphere two-in-one gas burner of the Chinese utility model patent ZL200420022626.4 (with the publication number of CN2702183Y) comprises a burning head, the upper part of the burning head is concave-nest-shaped, a burning cavity is arranged in the middle, a gas mixing cavity is arranged at the periphery of the burning cavity, the bottom parts of the burning cavity and the gas mixing cavity are both connected with an injection pipe, the bottom end of the injection pipe is provided with a gas nozzle, a fire cover is arranged in the burning cavity and connected with the injection pipe, a plurality of infrared radiation plates are arranged on the inclined plane of the gas mixing cavity, the gas enters the burning cavity and the gas mixing cavity from the two injection pipes respectively, the atmosphere burning cavity burns, and the inclined plane on the gas mixing chamber is infrared type burning, realizes infrared atmosphere two-in-one combined type burning, has simple structure, combustion effect characteristics such as good. Or can also refer to a new burner combining infrared and atmospheric combustion in the Chinese utility model patent with patent number 201220408192.6 (No. CN202747327U), the burner includes a burner base, a burner body and a burner upper cover, the burner body is positioned on the burner base, the burner upper cover includes an inner ring fire cover and an outer ring fire cover, the inner ring fire cover is provided with an inner ring fire hole, the outer ring fire cover is provided with an outer ring fire hole, and the inner ring fire cover and the outer ring fire cover are positioned on the upper end of the burner body; the burner is characterized by also comprising a plurality of ejector pipes, wherein one port of one ejector pipe is communicated with an inner ring fire hole on an inner ring fire cover, one ports of the other ejector pipes are communicated with an outer ring fire hole on an outer ring fire cover, the burner effectively improves the utilization rate of gas and reduces the emission of waste gas by combining an infrared micro-flame combustion technology adopted by the outer ring fire cover and an atmospheric open fire combustion technology adopted by the inner ring fire cover, or the burner comprises an inner ring combustion device, a middle ring combustion device and an outer ring combustion device in Chinese invention patent application No. CN201610861607.8 (with the publication No. CN 106287716A); one of the inner ring combustion device, the middle ring combustion device and the outer ring combustion device is a fully premixed infrared combustion device, and the other one is an atmospheric combustion device; 2 of the inner ring combustion device, the middle ring combustion device and the outer ring combustion device are full-premix infrared combustion devices, and the rest is an atmospheric combustion device, so that the pot is uniformly heated, and the requirements of large load and high energy efficiency can be met; 2 full-premix infrared combustion devices are selected, so that the emission of NOx and CO in the smoke is reduced, and the requirement of environmental protection is met; the number of the atmospheric combustion devices is 1, which is selected to increase firepower, but when the combination of the burners comprises an inner ring combustion device and an outer ring combustion device which are fully premixed infrared combustion devices, and the middle ring combustion device is an atmospheric burner, the atmospheric burner of the middle ring can easily generate yellow flame, backfire and other defects because of the mutual entrainment of hot air flow after the combustion of the inner ring combustion device and the outer ring combustion device and the high temperature of the inner ring combustion device and the outer ring combustion device on secondary air of the atmospheric burner of the middle ring; in addition, the fire outlet of the atmospheric burner of the middle ring is easy to be blocked by overflowing liquid.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide a burner for a gas range, which can ensure sufficient secondary air in the middle ring area of the burner, 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 range, which can effectively heat a pan bottom, in view of the above-mentioned prior art.

The technical scheme adopted by the invention for solving the first technical problem is as follows: this a combustor for gas-cooker, including the combustor body that has first gas chamber, with the gas pipe that first gas chamber is linked together and cover be in the mesh formula fire lid of the uncovered oral area of combustor body, its characterized in that: the gas burner comprises at least two first gas chambers which are distributed in sequence from the center to the periphery, wherein at least two adjacent first gas chambers are provided with a gap, a second gas chamber and a secondary air replenishing chamber which is independent from the second gas chamber and used for replenishing gas to the second gas chamber are arranged in the gap, a fire cover is arranged on the second gas chamber, the upper surface of the fire cover comprises at least two rotary arm type fire cover bodies which are arranged around the secondary air replenishing chamber, and each rotary arm type fire cover body is arranged at intervals along the circumferential direction of the base and is in a spiral radial shape integrally.

Furthermore, the secondary air replenishing chamber is provided with an air outlet and an air inlet communicated with the outside air and the air outlet, wherein a flow guide piece is arranged in the air outlet, a gap is formed between every two adjacent rotary arm type fire cover bodies, and secondary air in the secondary air replenishing chamber can be guided into the corresponding gaps by means of the flow guide piece.

In order to make the fire outlet holes of each rotary arm type fire cover body be supplemented with secondary air better, each rotary arm type fire cover body preferably comprises an outer side end far away from the first gas chamber positioned in the center, an inner side end close to the inner fire cover, an inner side edge facing to the rotary direction of the rotary arm and an outer side edge back to the rotary direction of the rotary arm, and the outer side edge is provided with at least two fire outlet holes.

In order to better prevent the overflow from flowing into the fire hole, it is preferable that the upper surface of the gap between the adjacent swing-arm fire cover bodies is gradually inclined inward from the outer end of the swing-arm fire cover body to the inner end. Once the overflow liquid flows into the upper surface of the rotary arm type fire cover body, the overflow liquid can be discharged to the gap between the adjacent rotary arm type fire cover bodies.

For better draining of spills, preferably the upper surface of each swing-arm fire cover body is inclined gradually outwards from high to low from the outer end of the swing-arm fire cover body to the inner end.

In order to facilitate the fire ignited in the first gas chamber located at the center to be capable of transmitting fire to each swing-arm type fire cover body, preferably, the inner side end and/or the inner side end of each swing-arm type fire cover body is/are provided with a fire transmission groove for communicating the first gas chamber corresponding to the swing-arm type fire cover body with the fire outlet hole.

Further, the outer side edge and the outer side end of each swing-arm type fire cover body are provided with convex edges protruding out of the upper surface of each swing-arm type fire cover body, and the convex edges can be used for preventing overflowing liquid from flowing into the fire outlet.

In order to better improve the structure, each flow guide part comprises at least one flow guide sheet which is in clearance with the corresponding adjacent fire cover.

In order to better guide the secondary air to the fire outlet hole of each swing-arm type fire cover body, the height of the root of each guide vane is preferably lower than that of the free end, and the guide vane gradually inclines upwards from bottom to top.

From the viewpoint of structural simplicity, it is preferable that each of the guide vanes is formed by directly bending the guide punched hole.

In order to achieve the function of the deflector to also contain the overflowing liquid, the upper surface of the bottom of the deflector preferably has a concave annular liquid collecting groove at the peripheral part of the free end or the root of each deflector. Because the overflow spills over from the pot limit of pan easily in the culinary art process, the overflow gets into the change of the upper surface of fire lid and gets into the outside end earlier, again from the outside end to the inside end inward flow gradually by the upper surface of fire lid, still realizes flowing to the low department from outside limit to inside edge gradually when nevertheless inward flow, and final overflow gets into annular collecting tank, plays the guard action.

Further, the combustor body comprises an inner cylinder body which is located in the center and has an upward opening, the inner cylinder body encloses the first gas chamber located in the center, the first gas chamber is provided with an installation chamber independent of the first gas chamber, the installation chamber is used for accommodating an ignition needle and/or a thermocouple, and a communication port is formed in the position, corresponding to the ignition needle and/or the thermocouple, of the first fire cover. The ignition needle and the thermocouple can be replaced by the ion needle, the ignition needle and the thermocouple or the ion needle are hidden in the installation chamber through the installation chamber so as to improve the use environment of the ignition needle and/or the thermocouple or the ion needle, on one hand, the overflowing liquid can be prevented from entering the installation chamber, on the other hand, the ignition needle and/or the thermocouple can be effectively protected from the surrounding wind power, further, the ignition success rate of the ignition needle and/or the ignition rate of the thermocouple are improved, and meanwhile, the service life of the ignition needle and/or the thermocouple can be prolonged.

In order to prevent the spilled liquid from affecting the ignition needle and/or the thermocouple, the top of the installation chamber is preferably provided with a waterproof brim.

In order to solve the second technical problem, it is preferable that the mesh type fire covers of adjacent first gas chambers are formed in a V-shape. The included angle of the V shape is 90-180 degrees, because the mesh-type fire covers cover the adjacent first gas chambers, the center and the periphery of the second gas chamber are both infrared burners, the second gas chamber is an atmospheric burner, the infrared burners can enable flame to be uniformly distributed on the mesh-type fire covers to form short flame, and the flame is not easy to fly to increase the combustion efficiency, on one hand, the gas is more uniformly distributed at each position of the gas chambers, so that the gas flow rate reaching the fire holes is more uniform, the heat efficiency is improved, the discharge amount of carbon monoxide is reduced, the mesh-type fire covers cover the adjacent first gas chambers are equivalent to high-temperature inner and outer radiation plates, the two gas chambers can be mutually subjected to radiation heating, the temperature of the radiation plate body is increased, the temperature difference between the radiation plates and the bottom of a boiler is increased, and the radiation heat transfer is improved; in addition, the inner and outer radiation plates form a high-temperature radiation environment above the second fuel gas chamber of the middle ring, which is beneficial to the full combustion of the fire cover of the middle ring, thereby improving the overall thermal efficiency of the burner.

Compared with the prior art, the invention has the advantages that the adjacent first gas chambers and the second gas chamber positioned between the adjacent first gas chambers are divided into at least an inner ring, a middle ring and an outer ring for independent gas supply, the inner ring and the outer ring are used for infrared combustion to inject excessive primary air, after the infrared combustion of the second gas chamber is met, the redundant primary air and the secondary air supplement chamber can jointly supply secondary air to the second gas chamber positioned in the middle ring, the smoke exceeding caused by the deficiency of the secondary air in the middle ring can be avoided, meanwhile, the rotary arm type middle ring fire cover is arranged around the gas supplement chamber and is integrally spirally radial, the distance between the mesh type inner fire cover and the conventional middle ring fire cover body can be effectively compensated, and the uniformity and the combustion efficiency of the heating pot bottom of the mesh type inner fire cover are further realized.

Drawings

FIG. 1 is a schematic view 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 fire cover in an embodiment of the present invention;

FIG. 4 is a schematic structural view of a baffle member according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a first mesh-type fire cover 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 FIGS. 1 to 5, the preferred embodiment of the present invention is shown. The burner for the gas stove comprises a burner body 1 with a first gas chamber, at least two gas pipes 2 communicated with the first gas chamber and mesh type fire covers covering an open mouth of the burner body 1, wherein the number of the first gas chambers is at least two, the first gas chambers are distributed from the center to the periphery in sequence, a gap is formed between at least two adjacent first gas chambers, a second gas chamber 3 and a secondary air replenishing chamber 4 which is independent from the second gas chamber 3 and is used for replenishing air to the second gas chamber 3 are arranged in the gap, a fire cover 5 is arranged on the second gas chamber 3, the upper surface of the fire cover 5 comprises at least two rotary arm type fire cover bodies 51 arranged around the secondary air replenishing chamber 4, and each rotary arm type fire cover body 51 is arranged at intervals along the circumferential direction of a base and is integrally spirally radial.

Specifically, the first gas chambers of this embodiment are provided with two at an inner and outer interval, and the second gas chamber 3 has one, that is, the adjacent first gas chambers and the second gas chamber 3 located between the adjacent first gas chambers are divided into an inner, a middle and an outer ring for independent gas supply, excessive primary air is injected by the inner and outer ring infrared combustion, after self infrared combustion is satisfied, the redundant primary air and the secondary air supplement chamber can supply secondary air to the second gas chamber 3 located in the middle ring together, smoke generated by insufficient middle ring secondary air can be avoided exceeding standard, meanwhile, the middle ring fire cover 5 in the form of a spiral arm is arranged around the gas supply chamber, and is in a spiral radial shape as a whole, so that the interval between the mesh type fire cover and the conventional middle ring fire cover 5 can be effectively compensated, and the uniformity and the combustion efficiency of the heating pan bottom of the mesh type inner fire cover can be further realized. The secondary air supply chamber 4 has an air outlet 411 and an air inlet (not shown in the figure) communicating with the outside air and the air outlet 411, wherein a flow guide member 6 is arranged in the air outlet 411, a gap 52 is arranged between adjacent fire covers 5, and the secondary air in the secondary air supply chamber 4 can be guided into the respective corresponding gap 52 by means of the flow guide member 6. In order to make the fire outlet holes 5141 of each of the rotary arm type fire cover bodies 51 be better supplemented with secondary air, each of the rotary arm type fire cover bodies 51 comprises an outer side end 511 of the mesh type fire cover with the first gas chamber positioned at the center, an inner side end 512 adjacent to the first gas chamber positioned at the center, an inner side end 513 facing the rotation direction of the rotary arm, and an outer side edge 514 facing away from the rotation direction of the rotary arm, wherein the outer side edge 514 is provided with at least two fire outlet holes 5141. In order to better supply the secondary air to the fire outlet holes 5141 of each of the swing-arm type fire cover bodies 51 and to better discharge the overflowing liquid, it is preferable that the upper surface of each of the swing-arm type fire cover bodies 51 is gradually inclined outward from the outer side end 511 to the inner side end 512 of the swing-arm type fire cover body 51 from high to low.

In order to facilitate the fire ignited in the central first gas chamber to be able to transfer fire to each of the swing-arm type fire cover bodies 51, the inner side 512 and/or the inner side 513 of each of the swing-arm type fire cover bodies 51 has a fire transfer groove 515 for communicating the corresponding first gas chamber with the fire outlet hole 5141, in this embodiment, the fire transfer groove 515 penetrates through the inner side 512 and the inner side 513 of each of the swing-arm type fire cover bodies 51, and the outer side 514 and the outer side 511 of each of the swing-arm type fire cover bodies 51 have a flange 516 protruding out of the upper surface of each of the swing-arm type fire cover bodies 51, and the flange 516 can be used for preventing the overflow liquid from flowing into the fire outlet hole 5141. Wherein the flow guide member 6 includes at least one flow guide piece 61 having a gap 52 with the adjacent fire lid 5, and in order to better guide the secondary air to the fire outlet hole 5141 of each swing-arm type fire lid body 51, the height of the root 611 of each flow guide piece 61 is lower than that of the free end 612, and gradually inclines upwards from bottom to top, and from the viewpoint of simple structure, preferably, each flow guide piece 61 is formed by directly bending the punched hole of the flow guide member 6. In addition, in order to realize that the flow guide member 6 also has the function of containing overflowing liquid, the upper surface of the bottom of the flow guide member 6 is provided with a concave annular liquid collecting groove 7 at the periphery of the free end 612 or the root 611 of each flow guide sheet 61, and as overflowing liquid is easy to overflow from the pot edge of a pot in the cooking process, overflowing liquid enters the upper surface of the fire cover 5 and is easier to enter the outer side end 511, then flows inwards from the outer side end 511 to the inner side end 512 through the upper surface of the fire cover 5, but flows downwards gradually from the outer side edge 514 to the inner side end 513 while flowing inwards, and finally, overflowing liquid enters the annular liquid collecting groove 7 to play a role in protection. In addition, the burner body 1 includes an inner cylinder body with a central opening facing upward, the inner cylinder body defines a first gas chamber with a central opening, and the first gas chamber has an installation chamber 10 independent of the first gas chamber, the installation chamber 10 is used for accommodating an ignition needle and/or a thermocouple, the first fire cover 5 has a communication port 101 corresponding to the ignition needle and/or the thermocouple, the ignition needle and the thermocouple can be replaced by an ion needle, the installation chamber 10 can hide the ignition needle and the thermocouple or the ion needle 80 in the installation chamber 10 to improve the usage environment of the ignition needle and/or the thermocouple or the ion needle, on one hand, the ignition needle and/or the thermocouple can be prevented from entering the installation chamber 10, on the other hand, the ignition needle and/or the thermocouple can be protected from the surrounding wind force thermocouple, the thermocouple and/or the ignition needle can be effectively protected, thereby improving the ignition success rate of the ignition needle and/or the flame retention rate of the thermocouple, and simultaneously, the service life of the ignition needle and/or the thermocouple can be prolonged. In order to prevent the spilled liquid from affecting the ignition pins and/or thermocouples, the top of the installation chamber 10 has a waterproof eaves 8.

To sum up, the first gas chamber of the burner for the gas stove is divided into a first inner gas chamber 11 and a first outer gas chamber 12 which are positioned at the center and the periphery, the fire covers on the first inner gas chamber 11 and the first outer gas chamber 12 are mesh-type fire covers, wherein the mesh-type fire cover corresponding to the first inner gas chamber 11 is a first mesh-type fire cover 5 ', the first outer gas chamber 12 is a second mesh-type fire cover 5', the first mesh-type fire cover 5 'and the second mesh-type fire cover 5' form a V shape, and the included angle of the V shape is 90-180 degrees. For this purpose, the first inner combustion chamber 11 and the first outer combustion chamber 12 are infrared burners, and the second combustion chamber 3 located between the first inner combustion chamber 11 and the first outer combustion chamber 12 is an atmospheric burner, so that the infrared burners of the first inner combustion chamber 11 and the first outer combustion chamber 12 located at the inner and outer peripheries can make the flame spread evenly on the corresponding first mesh type fire cover 5 'and the second mesh type fire cover 5 ″ to form short flame, and the flame is not easy to fly to increase the combustion efficiency, which helps to distribute the gas more evenly on each position of the combustion chamber, thereby making the gas flow rate reaching the fire hole more even, improving the thermal efficiency and reducing the discharge amount of carbon monoxide, and the first mesh type fire cover 5' and the second mesh type fire cover 5 ″ covered on the first inner combustion chamber 11 and the first outer combustion chamber 12 correspond to the inner and outer radiant plates with high temperature, the radiation plate and the pot bottom can be mutually subjected to radiation heating, so that the temperature of the radiation plate body is increased, the temperature difference between the radiation plate and the pot bottom is increased, and the radiation heat transfer is improved; in addition, the inner and outer radiation plates form a high-temperature radiation environment above the middle ring second gas chamber 3, which is beneficial to the full combustion of the fire cover 5 of the middle ring, thereby improving the overall thermal efficiency of the burner. When the secondary air injection device works, secondary air enters through an air inlet 421 of a secondary air supplement chamber, gas and primary air are introduced through the first injection pipes 60 corresponding to the first inner gas chamber 11 and the first outer gas chamber 12 respectively, mesh type fire covers of the first inner gas chamber 11 and the first outer gas chamber 12 are ignited under the ignition action of the ion needles, sufficient combustion reaction is generated, inner and outer ring fire is formed respectively, the problem of nonuniform flame leaving and flame temperature distribution can be solved well due to the fact that the first mesh type fire cover 5 'and the second mesh type fire cover 5' are in a mesh shape, in addition, the second gas chamber 3 positioned between the first inner gas chamber 11 and the first outer gas chamber 12 is introduced through the second injection pipe 70, the gas and the primary air flow out through the fire outlet 5141 of the rotary arm type fire cover body 51 of the rotary arm type fire cover body 5 on the second gas chamber 3, and the mixed primary air and gas finally flow out through the fire outlet 5141, the fire outlet 41, the fire outlet of the rotary arm type fire cover body 51, the first gas and the second gas chamber 11, And the secondary air of the secondary air supplement chamber is ignited after being conducted fire through the fire conducting groove 515 from the inner ring fire to form middle ring rotary fire, after the first inner combustion air chamber 11 and the first outer combustion air chamber 12 meet self infrared combustion, redundant primary air can be supplied to the second combustion air chamber 3 positioned in the middle ring, and the condition that smoke generated by the shortage of the middle ring secondary air exceeds the standard can be avoided.

Claims

1. A burner for gas cookers, comprising a burner body (1) having a first gas chamber (11; 12), a gas pipe (2) communicating with the first gas chamber (11; 12), and a mesh-type fire cover (5 '; 5') covering the open mouth of the burner body (1), characterized in that: the gas supply device is characterized in that at least two first gas chambers (11; 12) are sequentially distributed from the center to the periphery, a space is arranged between at least two adjacent first gas chambers (11; 12), a second gas chamber (3) and a secondary air replenishing chamber (4) which is independent of the second gas chamber (3) and is used for replenishing gas to the second gas chamber (3) are arranged in the space, a fire cover (5) is arranged on the second gas chamber (3), the upper surface of the fire cover (5) comprises at least two rotary arm type fire cover bodies (51) which are arranged around the secondary air replenishing chamber (4), and each rotary arm type fire cover body (51) is arranged at intervals along the circumferential direction of the base and is integrally spirally radial.

2. Burner for gas cooktops according to claim 1, characterized in that: the secondary air supplementing chamber (4) is provided with an air outlet (411) and an air inlet communicated with the outside air and the air outlet (411), wherein a flow guide part (6) is arranged in the air outlet (411), a gap (52) is formed between every two adjacent swing-arm fire cover bodies (51), and secondary air in the secondary air supplementing chamber (4) can be guided into the corresponding gaps (52) by means of the flow guide part (6).

3. Burner for gas cooktops according to claim 2, characterized in that: each rotary arm type fire cover body (51) comprises an outer side end (511) far away from the mesh type fire cover of the first gas chamber (11; 12) in the center, an inner side end (512) close to the mesh type fire cover (5) of the first gas chamber (11; 12) in the center, an inner side end (513) facing to the rotary arm rotating direction and an outer side edge (514) back to the rotary arm rotating direction, and the outer side edge (514) is provided with at least two fire outlets (5141).

4. Burner for gas cooktops according to claim 3, characterized in that: the upper surface of a gap (52) between adjacent swing-arm type fire cover bodies (51) is gradually inclined inwards from high to low from the outer side end (511) to the inner side end (512) of the swing-arm type fire cover body (51).

5. Burner for gas cooktops according to claim 4, characterized in that: the upper surface of each swing-arm type fire cover body (51) gradually inclines outwards from high to low from the outer side end (511) to the inner side end (512) of the swing-arm type fire cover body (51).

6. Burner for gas cooktops according to claim 5, characterized in that: the inner side end (512) and/or the inner side end (513) of each rotary arm type fire cover body (51) is provided with a fire transfer groove (515) which is communicated with the corresponding first gas chamber (11; 12) and the fire outlet hole (5141).

7. Burner for gas cooktops according to claim 6, characterized in that: the outer side edge (514) and the outer side end (511) of each swing-arm-type fire cover body (51) are provided with convex edges (516) protruding out of the upper surface of each swing-arm-type fire cover body (51), and the convex edges (516) can be used for preventing overflowing liquid from flowing into the fire outlet holes (5141).

8. The burner for a gas range according to any one of claims 2 to 7, wherein: each flow guide part (6) comprises at least one flow guide sheet (61) which is provided with a gap (52) between the flow guide sheet and the corresponding adjacent swing-arm type fire cover body (51).

9. Burner for gas cooktops according to claim 8, characterized in that: the height of the root (611) of each guide vane (61) is lower than that of the free end (612), and the guide vanes are gradually inclined upwards from bottom to top.

10. Burner for gas cooktops according to claim 9, characterized in that: each guide vane (61) is formed by punching the guide piece (6) and directly bending.

11. Burner for gas cooktops according to claim 9 or 10, characterized in that: the upper surface of the bottom of the flow guide piece (6) is provided with a concave annular liquid collecting groove (7) at the periphery of the free end (612) or the root (611) of each flow guide sheet (61), and the annular liquid collecting groove (7) is communicated with the gap (52) between the adjacent fire covers (5).

12. Burner for gas cooktops according to claim 11, characterized in that: the burner body (1) comprises a central upward-opening inner cylinder body, the inner cylinder body encloses the first gas chamber (11; 12) in the center, the first gas chamber (11; 12) is provided with a mounting chamber (10) independent of the first gas chamber (11; 12), the mounting chamber (10) is used for accommodating an ignition needle and/or a thermocouple, and a mesh type fire cover on the first gas chamber (11; 12) in the center is provided with a communication port (101) corresponding to the ignition needle and/or the thermocouple.

13. Burner for gas cooktops according to claim 12, characterized in that: the top of the mounting chamber (10) is provided with a waterproof brim (8).

14. Burner for gas cooktops according to claim 13, characterized in that: the mesh type fire covers of the adjacent first gas chambers (11; 12) form a V shape.