A burner for a gas stove

Abstract

The present invention relates to a burner for a gas stove, comprising a base, a first fire cover arranged on the base, and a first air mixing chamber located in the center is formed between the base and the second fire cover, which is also arranged on the base and a first air mixing chamber located around the first air mixing chamber is formed between the base and the second fire cover, characterized in that: it also includes a secondary air supply chamber. Compared with the prior art, the advantage of the present invention is that the adjacent first air mixing chamber and the third air mixing chamber are both independently supplied with air. In order to avoid the combustion heat generated when the first fire cover and the third fire cover are burned to affect the secondary air supply of the second fire cover, among the two rows of fire holes arranged on the second air mixing chamber, the first fire outlet hole close to the first air mixing chamber is close to the secondary air supply chamber and can replenish the secondary air more independently, while the third fire outlet hole close to the third air mixing chamber relies on the guide member to replenish the secondary air, thereby avoiding excessive smoke caused by insufficient secondary air when the second fire cover of the second air mixing chamber is burned.

Description

Technical Field

[0001] The invention relates to the technical field of household kitchenware, and in particular to a burner for a gas stove. Background Art

[0002] The infrared burners currently on the market do not require secondary air for combustion, and all primary air is provided by natural induced injection. However, in order to fully and evenly mix the gas and air, a relatively long mixing tube or a large mixing chamber is required, which is bulky. This results in a larger combustion disc diameter than that of an atmospheric burner, about 150mm, and the actual thermal efficiency of using small pointed-bottom pots will be greatly reduced. Moreover, although the thermal efficiency of infrared burners is higher than that of atmospheric burners, the increase in heat load requires the burner diameter to increase several times, which cannot meet civilian requirements. Therefore, the heat flow of the burner is only about 3.5kW, which is not suitable for the Chinese habit of stir-frying, so the market share is very small.

[0003] In order to cater to the cooking habits of Chinese people, the existing infrared burners form semi-infrared and semi-atmospheric combustion by adding an atmospheric burner on the outside or inside of the burner, thereby increasing the heat load. For example, a Chinese utility model patent with patent number ZL200420022626.4 (authorization announcement number CN2702183Y) "Infrared Atmospheric Two-in-One Gas Burner" comprises a burner head, which is concave in shape, with a combustion chamber in the middle, a gas mixing chamber arranged on the periphery of the combustion chamber, and an ejector pipe is connected to the bottom of the combustion chamber and the gas mixing chamber. A gas nozzle is arranged at the bottom of the ejector pipe, a fire cover is arranged in the combustion chamber and connected to the ejector pipe, and a plurality of infrared radiation plates are arranged on the inclined surface of the gas mixing chamber. The gas enters the combustion chamber and the gas mixing chamber respectively from the two ejector pipes. The combustion chamber is atmospheric combustion, and the inclined surface on the gas mixing chamber is infrared combustion, realizing infrared atmospheric two-in-one combined combustion, which has the characteristics of simple structure and good combustion effect.Or you can also refer to a Chinese utility model patent with patent number 201220408192.6 (authorization announcement number CN202747327U) "New burner combining infrared and atmospheric combustion". The burner includes a burner base, a burner body and a burner cover. The burner body is positioned on the burner base, and the burner 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, and 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 both positioned at the upper end of the burner body; a plurality of ejector tubes are also provided, One end of one of the ejector tubes is connected to the inner ring fire hole on the inner ring fire cover, and one end of the remaining ejector tubes is connected to the outer ring fire hole on the outer ring fire cover. The burner effectively improves the gas utilization rate and reduces the emission of exhaust gas by combining the infrared micro-flame combustion technology of the outer ring fire cover with the atmospheric open flame combustion technology of the inner ring fire cover. Or a Chinese invention patent application with application number CN201610861607.8 (publication number CN106287716A) "A three-ring burner" The burner includes an inner ring combustion device, a middle ring combustion device, and a middle ring combustion device. The inner ring combustion device, the middle ring combustion device and the outer ring combustion device are respectively a fully premixed infrared combustion device and an outer ring combustion device; 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 remaining one is an atmospheric combustion device; two of the inner ring combustion device, the middle ring combustion device and the outer ring combustion device are fully premixed infrared combustion devices, and the remaining one is an atmospheric combustion device, so that the heating of the pot is uniform and can meet the requirements of high load and high energy efficiency; two fully premixed infrared combustion devices are selected because they can reduce the emission of NOx and CO in the flue gas and meet the requirements of environmental protection; the atmospheric combustion device is selected There is one type of combustion device in order to increase the firepower. However, when the burner combination includes 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 will be susceptible to defects such as yellow flame and flashback due to the mutual entrainment effect of the hot air flows after combustion of the inner and outer ring combustion devices and the high temperatures of the inner and outer ring combustion devices on the secondary air supplied to the atmospheric burner of the middle ring. In addition, the fire outlet of the atmospheric burner of the middle ring will be easily blocked due to overflow. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a burner for a gas stove that can ensure sufficient secondary air in the middle ring area of ​​the burner in view of the above-mentioned existing technical status.

[0005] The second technical problem to be solved by the present invention is to provide a burner for a gas stove that can heat the bottom of a pot evenly in view of the above-mentioned prior art status.

[0006] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: the burner for the gas stove comprises

[0007] Base;

[0008] A first fire cover is disposed on the base and forms a first gas mixing chamber located in the center between the first fire cover and the base;

[0009] The second fire cover is also arranged on the base, and a first gas mixing chamber is formed between the second fire cover and the base and located outside the first gas mixing chamber; the second fire cover is characterized in that:

[0010] first fire outlet holes are arranged on the second fire cover at intervals along the circumferential direction and close to the first fire cover;

[0011] Second fire outlet holes are arranged on the second fire cover at intervals along the circumferential direction and are closer to the radial outer side of the second fire cover than the first fire outlet holes;

[0012] A third fire cover is arranged on the base, and a third gas mixing chamber is formed between the third fire cover and the base and is located outside the second gas mixing chamber;

[0013] a secondary air replenishing chamber, formed between the first air mixing chamber and the second air mixing chamber, the secondary air replenishing chamber having a top wall of an air outlet and a bottom wall opposite to the top wall, the bottom wall being provided with an air inlet communicating with the outside air and the air outlet; and

[0014] A flow guide is arranged in the air outlet, and the secondary air in the secondary air supply chamber can be guided into the fire outlet areas of each second fire outlet and / or each first fire outlet.

[0015] Since the second fire hole is closer to the radial outside of the second fire cover than the first fire hole, the secondary air in the secondary air replenishment chamber participates in the combustion at the front end of the first fire hole. Therefore, the amount of secondary air is reduced, and it is more difficult for the secondary air to be replenished to the second fire hole. In order to avoid the secondary air in the secondary air replenishment chamber being difficult to replenish to the second fire hole due to the combustion heat of the first fire hole, preferably, the guide member includes at least one guide plate corresponding to the fire area of ​​each second fire hole.

[0016] In order to achieve faster replenishment of secondary air to the second ignition hole, preferably, the height of the root of each guide plate is lower than the height of the free end, and gradually tilts upward from bottom to top.

[0017] From the perspective of simple processing, preferably, each guide plate is formed by directly bending the guide member through punching.

[0018] Furthermore, a guide channel is provided between adjacent second fire outlet holes, and each of the guide channels is aligned with the corresponding guide plate. The guide channels are provided between adjacent second fire outlet holes, so that the secondary air introduced through the guide plate can be better replenished into the guide channel, and then the secondary air can be better replenished to the root of the second fire outlet hole, and each guide channel rotates in a clockwise direction, so that the secondary air can rotate and then better replenish the second fire outlet hole. In addition, since the overflow is easy to overflow from the edge of the pot during cooking, the overflow entering the upper surface of the fire cover is more likely to enter the guide channel first, and finally the overflow enters the annular liquid collecting groove, which plays a protective role to prevent the overflow from clogging the second fire outlet hole.

[0019] Preferably, the bottom upper surface of the guide member has a concave annular liquid collecting groove at the peripheral part of the free end or root of each guide plate, and the annular liquid collecting groove is located at the lower end of the guide channel. The annular liquid collecting groove can collect the overflow from the guide channel on the one hand, and prevent the overflow from entering the secondary air replenishment chamber on the other hand.

[0020] Furthermore, the center of the first mixing chamber has an installation chamber independent of the first mixing chamber, and the installation chamber is used to accommodate an ignition needle and / or a thermocouple, and the first ignition cover has a connecting port corresponding to the position of the ignition needle and / or the thermocouple. The present invention can also replace the ignition needle and the thermocouple with an ion needle, and the ignition needle and the thermocouple / ion needle are hidden in the installation chamber through the installation chamber to improve the use environment of the ignition needle and / or the thermocouple or the ion needle. On the one hand, it can prevent overflow from entering the installation chamber, and on the other hand, it can also make the ignition needle and / or the thermocouple not affected by the surrounding wind force and effectively protect the thermocouple and / or the ignition needle, thereby improving the ignition success rate of the ignition needle and / or the fire retention rate of the thermocouple, and at the same time, it can also extend the service life of the ignition needle and / or the thermocouple.

[0021] In order to prevent the overflow from affecting the ignition needle and / or the thermocouple, preferably, the top of the installation room has a waterproof eaves.

[0022] Furthermore, the third fire cover and the first fire cover are both mesh-type fire covers, and the third fire cover and the first fire cover form a V shape. In this way, the first fire cover, the second fire cover and the third fire cover form three independent air supply rings, the inner, middle and outer rings formed by the first fire cover and the third fire cover are mesh-type fire covers, and the infrared combustion of the inner and outer rings will induce excessive primary air. After satisfying their own infrared combustion, the excess primary air can be used together with the secondary air replenishment chamber to supply the secondary air to the second fire cover located in the middle ring, thereby avoiding excessive smoke caused by insufficient secondary air in the middle ring.

[0023] Further, the third mixing chamber includes an inner annular wall and an outer annular wall arranged at intervals and a bottom annular wall connecting the inner annular wall and the outer annular wall, wherein the inner annular wall includes an upper inner annular wall and a lower inner annular wall, the lower end of the upper inner annular wall is circumferentially provided with at least one inner boss, the position of the lower inner annular wall corresponding to the inner boss is provided with an inner guide seat for cooperation with the lower end of the inner boss, the outer annular wall includes an upper outer annular wall and a lower outer annular wall, the lower end of the upper outer annular wall is circumferentially provided with at least one outer boss, the position of the lower outer annular wall corresponding to the outer boss is provided with an outer guide seat for cooperation with the lower end of the outer boss, and a driving member connected to the lower ends of the inner boss and the outer boss is provided on the bottom annular wall, and the driving member can drive the upper inner annular wall and the upper outer annular wall to connect to the vertical movement of the third fire cover. When the user uses a small-sized soup pot or milk pot for stewing, the third fire cover drops below the panel to be used as a heat collecting cover. The inner convex column and the outer convex column are both connected to a driving structure such as a motor to synchronously control their smooth lifting and lowering, and the outer ring valve body is linked to control the air cut-off when in the descending state.

[0024] Compared with the prior art, the advantage of the present invention is that the adjacent first mixing chamber and third mixing chamber are both independently supplied with air. In order to prevent the combustion heat generated by the combustion of the first fire cover and the third fire cover from affecting the secondary air supply of the second fire cover, among the two rows of fire holes arranged on the second mixing chamber, the first fire hole close to the first mixing chamber is close to the secondary air supply chamber and can replenish the secondary air more independently, while the third fire hole close to the third mixing chamber relies on the guide member to supply the secondary air, thereby avoiding excessive smoke caused by insufficient secondary air when the second fire cover of the second mixing chamber burns, which can effectively improve the combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the burner in Example 1 of the present invention;

[0026] Figure 2 Schematic diagram of the structure of the flow guide member in Example 1 of the present invention;

[0027] Figure 3 for Figure 1 A cross-sectional view of

[0028] Figure 4 This is a structural schematic diagram of the third fire cover of the burner in Example 1 of the present invention being lowered below the panel and used as a heat collecting cover;

[0029] Figure 5 for Figure 4 A cross-sectional view of

[0030] Figure 6 Schematic diagram of the structure of the burner in Example 3 of the present invention;

[0031] Figure 7is a schematic structural diagram of a flow guide member in Embodiment 3 of the present invention;

[0032] Figure 8 Schematic diagram of the structure of the burner in Example 4 of the present invention;

[0033] Fig. 9 for Figure 8 A cross-sectional view of

[0034] Fig.10 Schematic diagram of the structure of the flow guide member in Example 4 of the present invention. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the accompanying drawings.

[0036] Example 1

[0037] like Figures 1 to 5The burner for the gas stove of this embodiment includes a base 1; a first fire cover 2 arranged on the base 1, a first gas mixing chamber 21 located in the center is formed between the first fire cover 2 and the base 1, and a second fire cover 3 is also arranged on the base 1, a first gas mixing chamber 21 located outside the first gas mixing chamber 21 is formed between the second fire cover 3 and the base 1; wherein the second fire cover 3 is provided with first fire outlets 32 near the first fire cover 2 and second fire outlets 33 arranged on the second fire cover 3 at intervals along the circumferential direction, compared with the first outlets The fire hole 32 and the second fire outlet hole 33 are closer to the radial outer side of the second fire cover 3; a secondary air supply chamber 4 is formed between the first mixing chamber 21 and the second mixing chamber 31, and the secondary air supply chamber 4 has a top wall 41 of an air outlet 411 and a bottom wall 42 opposite to the top wall 41, and the bottom wall 42 is provided with an air inlet 421 connected with the outside air and the air outlet 411, and a guide member 5 is also provided in the air outlet 411, by means of which the secondary air in the secondary air supply chamber 4 can be guided into the fire outlet area of ​​each second fire outlet hole 33. The adjacent first mixing chamber 21 and second mixing chamber 31 both have independent air supplies. The first fire cover 2 corresponding to the first mixing chamber 21 is a mesh-type fire cover that can constitute an infrared burner. Among the two rows of fire holes arranged on the second mixing chamber 31, since the first fire outlet 32 ​​is close to the first mixing chamber 21 and close to the secondary air replenishment chamber, the secondary air can be replenished more independently, thereby avoiding the combustion heat generated by the combustion of the first fire cover 2 affecting the supply of secondary air, thereby avoiding excessive smoke caused by insufficient secondary air when the second fire cover 3 of the second mixing chamber 31 burns. In this way, the combination of infrared burner and atmospheric burner can effectively improve the combustion efficiency. In order to facilitate ignition and fire preservation, the center of the first mixing chamber 21 has an installation chamber 20 independent of the first mixing chamber 21, and the installation chamber 20 is used to accommodate an ignition needle and / or a thermocouple. The first fire cover 2 has a connecting port corresponding to the position of the ignition needle and / or the thermocouple. In this embodiment, the ignition needle and the thermocouple can also be replaced by an ion needle 40. The installation chamber 20 allows the ignition needle and the thermocouple / ion needle 40 to be hidden in the installation chamber 20 to improve the use environment of the ignition needle and / or the thermocouple or the ion needle 40. On the one hand, it can prevent overflow from entering the installation chamber 20, and on the other hand, it can also prevent the ignition needle and / or the thermocouple or the ion needle 40 from being affected by the surrounding wind force and effectively protect the thermocouple and / or the ignition needle or the ion needle 40, thereby improving the ignition success rate of the ignition needle and / or the fire preservation rate of the thermocouple or the ion needle 40, and at the same time, it can also extend the service life of the ignition needle and / or the thermocouple or the ion needle 40. In order to prevent the overflow from affecting the ignition needle and / or the thermocouple or the ion needle 40 , preferably, the top of the installation room 20 has a waterproof eaves 6 .

[0038] Specifically, it also includes a third fire cover 7 arranged on the base 1, and a third air mixing chamber 71 located outside the second air mixing chamber 31 is formed between the third fire cover 7 and the base 1, and the third fire cover 7 and the first fire cover 2 form a V shape, and the first fire cover 2 and the third fire cover 7 are mesh-type fire covers, wherein the angle of the V shape is 90 to 180 degrees, so that the first fire cover 2 and the third fire cover 7 can form an infrared burner located in the center and the periphery together with the base 1, and the second fire cover 3 located between the first fire cover 2 and the third fire cover 7 and the base 1 together form an atmospheric burner in the middle, and the first fire cover 2 and the third fire cover The flame formed on 7 can be evenly distributed on the mesh fire cover to form a short flame, and the flame is not easy to fly and increase the combustion efficiency, thereby improving the thermal efficiency and reducing the emission of carbon monoxide. The first fire cover 2 and the third fire cover 7 are mesh structures equivalent to high-temperature inner and outer radiation plates. The two can radiate heat to each other, increase the temperature of the radiation plate body, thereby increasing the temperature difference between the radiation plate and the bottom of the pot, and improving radiation heat transfer; in addition, the inner and outer radiation plates form a high-temperature radiation environment above the second fire cover 3 in the middle ring, which is beneficial to the full combustion of the second fire cover 3 in the middle ring, thereby improving the overall thermal efficiency of the burner. Preferably, the third gas mixing chamber 71 includes an inner ring wall 711 and an outer ring wall 712 which are spaced apart and a bottom ring wall 713 connecting the inner ring wall 711 and the outer ring wall 712, wherein the inner ring wall 711 includes an upper inner ring wall 711a and a lower inner ring wall 711b, at the lower end of the upper inner ring wall 711a, at least one inner convex column 714 is circumferentially arranged, and at the position of the lower inner ring wall 711b corresponding to the inner convex column 714, an inner guide seat 7111b for the lower end of the inner convex column 714 to cooperate with is arranged, and the outer ring wall 712 includes an upper outer ring wall 712a and a lower outer ring wall 712b, and at least one outer convex column is circumferentially arranged at the lower end of the upper outer ring wall 712a. 715, the position of the lower outer ring wall 712b corresponding to the outer convex column 715 is provided with an outer guide seat 7121b for the lower end of the outer convex column 715 to cooperate with, and the bottom ring wall 713 is provided with a driving member connected with the lower ends of the inner convex column 714 and the outer convex column 715, and the driving member can drive the upper inner ring wall 711a and the upper outer ring wall 712a to connect the vertical movement of the third fire cover 7. When the user uses a small-sized soup pot or milk pot for stewing, the third fire cover 7 is lowered to below the panel 100 and used as a heat collecting cover. The inner convex column 714 and the outer convex column 715 are both connected to a driving structure such as a motor, which synchronously controls their smooth lifting and lowering, and the outer ring valve body is linked to control the air cut-off when in the descending state.In addition, since the second fire hole 33 is closer to the radial outer side of the second fire cover 3 than the first fire hole 32, the secondary air in the secondary air replenishment chamber participates in the combustion at the front end of the first fire hole 32. Therefore, the amount of secondary air is reduced, and it is more difficult to replenish the secondary air to the second fire hole. In order to avoid the secondary air in the secondary air replenishment chamber 4 from being affected by the combustion heat of the first fire hole 32 and making it difficult to replenish the second fire hole 33, the guide member 5 includes at least one guide plate 51 corresponding to the firing area of ​​each second fire hole 33. In order to achieve faster replenishment of secondary air to the second fire hole 33, the height of the root 511 of each guide plate 51 is lower than the height of the free end 512, and gradually tilts upward from bottom to top. In consideration of simple processing, each guide plate 51 is formed by directly bending the guide member 5 by punching.

[0039] During operation, secondary air enters through the air inlet 421 of the secondary air replenishment chamber, and the fuel gas and primary air are introduced through the first ejector tubes 710 corresponding to the first air mixing chamber 21 and the third air mixing chamber 71, respectively. Under the ignition action of the ion needle, the mesh fire covers of the first air mixing chamber 21 and the third air mixing chamber 71 are ignited, and a full combustion reaction occurs, forming inner and outer ring fires respectively. The mesh fire cover is in a grid shape, which can well solve the problem of flame separation and uneven flame temperature distribution. In addition, the second air mixing chamber 31 located between the first air mixing chamber 21 and the third air mixing chamber 71 The gas is introduced through the second ejector pipe 310, and the gas and primary air flow out through the first fire outlet hole 32 and the second fire outlet hole 33 on the second mixing chamber 31. The mixed primary air and gas finally pass through the first fire outlet hole 32 and the second fire outlet hole 33 and are ignited together with the secondary air in the secondary air replenishment chamber after being transferred from the inner ring fire to form a middle ring fire. After the first mixing chamber 21 and the third mixing chamber 71 satisfy their own infrared combustion, the excess primary air can also be given to the second mixing chamber 31 located in the middle ring, so as to avoid excessive smoke caused by insufficient secondary air in the middle ring.

[0040] Example 2

[0041] like Figure 1 and 3As shown, the structure is basically the same as that of Example 1, and the only difference is that: a guide channel 35 is arranged between adjacent second fire holes 33, and each guide channel 35 is aligned with its corresponding guide plate 51. The guide channel 35 is arranged between adjacent second fire holes 33, so that the secondary air introduced through the guide plate 51 can be better replenished into the guide channel 35, and then the secondary air can be better replenished to the root 511 of the second fire hole 33, and each guide channel 35 can rotate in a clockwise direction, so that the secondary air can rotate and then better replenish the second fire hole 33. In addition, since the overflow is easy to overflow from the edge of the pot during cooking, the overflow entering the upper surface of the fire cover is more likely to enter the guide channel 35 first, and finally the overflow enters the annular liquid collecting groove 50, which plays a protective role to prevent the overflow from clogging the second fire hole 33. The bottom upper surface of the guide member 5 has a concave annular liquid collecting groove 50 at the peripheral portion of the free end 512 or the root 511 of each guide plate 51. The annular liquid collecting groove 50 is located at the lower end of the guide channel 35. On the one hand, the annular liquid collecting groove 50 can collect the overflow flowing out of the guide channel 35, and on the other hand, it can prevent the overflow from entering the secondary air replenishment chamber.

[0042] Example 3

[0043] The structure is basically the same as that of Example 1, with the only difference being that the first fire hole 32 and the second fire hole 33 are mesh-type fire holes, the mesh areas of the first fire hole 32 are arranged at intervals along the second fire cover 3, and the mesh areas of the second fire holes 33 are distributed all over the radial outer side of the second fire cover 3, for which the guide plate 51 includes a first guide plate 51′ which corresponds to the mesh area of ​​the first fire hole 32 and the mesh area of ​​the second fire hole 33 at the same time, and the circumferential width of the first guide plate 51′ is relatively wide, and the guide plate 51 also includes a second guide plate 51″ which corresponds to the mesh area of ​​the second fire hole 33, and the circumferential width of the second guide plate 51″ is narrower than the circumferential width of the first guide plate 51′, refer to Figure 6 and 7 shown.

[0044] Example 4

[0045] The structure is basically the same as that of the embodiment 3, the only difference being that the guide member 5 is annular, and the outer periphery of the guide member 5 has at least two radially outwardly protruding outer convex portions 55, each of which at least partially extends into the interval between adjacent mesh-like areas in the first ignition hole 32, Figures 8 to 10 shown.

Claims

1. A burner for a gas stove, comprising Base (1); A first fire cover (2) is arranged on the base (1) and forms a first gas mixing chamber (21) located in the center between the first fire cover and the base (1); The second fire cover (3) is also arranged on the base (1), and a second gas mixing chamber (31) located outside the first gas mixing chamber (21) is formed between the second fire cover and the base (1); the second fire cover (3) is characterized in that: First fire outlet holes (32) are arranged on the second fire cover (3) at intervals along the circumferential direction and are close to the first fire cover (2); Second fire outlet holes (33) are arranged on the second fire cover (3) at intervals along the circumferential direction and are closer to the radial outer side of the second fire cover (3) than the first fire outlet holes (32); A third fire cover (7) is arranged on the base (1), and a third gas mixing chamber (71) located outside the second gas mixing chamber (31) is formed between the third fire cover (7) and the base (1); a secondary air replenishing chamber (4), formed between the first air mixing chamber (21) and the second air mixing chamber (31), the secondary air replenishing chamber (4) having a top wall (41) with an air outlet (411) and a bottom wall (42) opposite to the top wall (41), the bottom wall (42) being provided with an air inlet (421) communicating with the outside air and the air outlet (411); and A flow guide (5) is arranged in the air outlet (411), and can guide the secondary air in the secondary air replenishment chamber (4) into the ignition area of ​​each second ignition hole (33) and / or each first ignition hole (32) by means of the flow guide (5); The third fire cover (7) and the first fire cover (2) are both mesh-type fire covers, and the third fire cover (7) and the first fire cover (2) form a V shape; The third gas mixing chamber (71) includes an outer annular wall (712) arranged at intervals and a bottom annular wall (713) connecting the inner annular wall (711) and the outer annular wall (712), wherein the inner annular wall (711) includes an upper inner annular wall (711a) and a lower inner annular wall (711b), the lower end of the upper inner annular wall (711a) is provided with at least one inner convex column (714) along the circumferential direction, the lower inner annular wall (711b) is provided with an inner guide seat (7111b) for the lower end of the inner convex column (714) to cooperate with at a position corresponding to the inner convex column (714), and the outer annular wall (712) includes an upper outer An annular wall (712a) and a lower outer annular wall (712b), the lower end of the upper outer annular wall (712a) is circumferentially provided with at least one outer convex column (715), the lower outer annular wall (712b) is provided with an outer guide seat (7121b) for the lower end of the outer convex column (715) to cooperate with the position of the outer convex column (715), and the bottom annular wall (713) is provided with a driving member connected to the lower ends of the inner convex column (714) and the outer convex column (715), and the driving member can drive the upper inner annular wall (711a) and the upper outer annular wall (712a) to connect to the third fire cover (7) for vertical movement.

2. The burner for a gas stove according to claim 1, characterized in that: The guide member (5) comprises at least one guide plate (51) corresponding to the ignition area of ​​each second ignition hole (33).

3. The burner for a gas stove according to claim 2, characterized in that: The height of the root (511) of each guide plate (51) is lower than the height of the free end (512), and the guide plate gradually inclines upward from bottom to top.

4. The burner for a gas stove according to claim 3, characterized in that: Each of the guide plates (51) is formed by punching and directly bending the guide member (5).

5. The burner for a gas stove according to claim 4, characterized in that: A guide channel (35) is provided between adjacent second fire outlet holes (33), and each of the guide channels (35) is aligned with a corresponding guide plate (51) one by one.

6. The burner for a gas stove according to any one of claims 2 to 5, characterized in that: The bottom upper surface of the guide member (5) has a concave annular liquid collecting groove (50) at the peripheral portion of the free end (512) or the root (511) of each guide plate (51).

7. The burner for a gas stove according to claim 6, characterized in that: The center of the first gas mixing chamber (21) has an installation chamber (20) independent of the first gas mixing chamber (21), and the installation chamber (20) is used to accommodate an ignition needle and / or a thermocouple, and the first fire cover (2) has a communication port corresponding to the position of the ignition needle and / or the thermocouple.

8. The burner for a gas stove according to claim 7, characterized in that: The top of the installation room (20) is provided with a waterproof eaves (6).

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