Combustor and gas stove

Abstract

This invention discloses a burner and a gas stove. The burner includes a gas distribution plate, an outer burner cap, and an inner burner cap. An outer ring gas distribution channel is formed between the gas distribution plate and the outer burner cap. The outer burner cap is provided with an outer ring flame hole and a middle ring flame distribution hole that communicate with the outer ring gas distribution channel. The inner burner cap is provided with a middle ring flame hole and an inner ring flame hole, and the middle ring flame hole communicates with the middle ring flame distribution hole. By providing a middle ring flame distribution hole on the outer burner cap that connects the middle ring flame hole and the outer ring gas distribution channel, a portion of the gas in the main gas channel is introduced into the middle ring flame hole for combustion, forming a middle ring flame. This increases the heat load of the central flame and improves the thermal efficiency of the burner. Furthermore, a flame transmission hole is provided on the outer burner cap. The center position of the flame transmission hole is set lower than the center position of the gas outlet of the outer ring flame hole, so that the flame height at the flame transmission hole is lower than the flame height at the outer ring flame hole, thus forming a clearance space for the pot support feet and reducing the amount of carbon monoxide produced.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliances technology, and more particularly to a burner and a gas stove. Background Technology

[0002] A gas stove is a kitchen appliance that uses liquefied petroleum gas, manufactured gas, natural gas, or other gaseous fuels for direct-fire heating. The burner is a crucial component of a gas stove, and its structure directly affects its performance, particularly its thermal efficiency. Currently, without auxiliary technologies, the thermal efficiency of gas stove burners is only around 60%, resulting in significant energy waste. Most current burners only have inner and outer ring flames, leading to a low central heat load, which is a major reason for their low thermal efficiency.

[0003] Furthermore, the burner includes an outer flame cap, from which gas flows out and is ignited to form an outer ring flame. The gas stove also includes a pot rack for supporting the cookware. The pot rack is positioned around the burner and outside the outer flame cap. Because the pot rack is adjacent to the outer flame cap, part of the flame in the outer ring is blocked by the feet of the pot rack, resulting in incomplete combustion of the gas and thus the generation of a large amount of carbon monoxide, which affects the user's safety. Summary of the Invention

[0004] The first objective of this invention is to provide a burner with high central heat load, high thermal efficiency, complete combustion of fuel gas, low carbon monoxide production, and high safety in use.

[0005] The second objective of this invention is to provide a gas stove whose burner not only has high thermal efficiency, allowing for complete combustion of gas and full utilization of energy, but also produces low levels of carbon monoxide and is highly safe to use.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A burner includes: a gas distribution plate; an outer flame cover, the outer flame cover being disposed above the gas distribution plate, and an outer annular gas distribution channel being formed between the gas distribution plate and the outer flame cover, the outer annular gas distribution channel being able to communicate with the main gas passage of the burner head, the outer flame cover being provided with an outer annular flame hole communicating with one end of the outer annular gas distribution channel, the outer annular flame hole forming a gas outlet on the outer wall surface of the outer flame cover, and the outer flame cover also being provided with a middle annular flame distribution hole communicating with the other end of the outer annular gas distribution channel; and an inner flame cover, the inner flame cover being disposed above the outer flame cover, the inner flame cover being provided with a middle annular flame hole and an inner annular flame hole. The outer burner cover is provided with a flame transmission structure. The flame transmission structure is used to enable the flame of the middle ring fire generated at the middle ring fire hole to ignite the gas at the outer ring fire hole to form an outer ring fire. The flame transmission structure includes a flame transmission hole that penetrates the outer burner cover and forms a flame transmission inlet on the outer wall surface of the outer burner cover. The center position of the flame transmission inlet is lower than the center position of the gas outlet to form a clearance position for the pot support foot plate.

[0008] Preferably, the middle ring flame hole forms a gas outlet on the annular sidewall of the inner flame cover; the inner flame cover is provided with a middle ring flame stabilizing groove and a middle ring flame stabilizing hole, the middle ring flame stabilizing groove is provided on the annular sidewall of the inner flame cover and located below the gas outlet, and the middle ring flame stabilizing groove is connected to the middle ring flame distribution hole through the middle ring flame stabilizing hole.

[0009] Preferably, a mixing ring groove is provided on the top surface of the outer flame cap facing the inner flame cap, and the mixing ring groove connects the middle ring flame distribution hole, the middle ring flame stabilizing hole, and the middle ring flame hole.

[0010] Preferably, the gas distribution plate is provided with a first gas distribution groove, and the outer flame cover is provided with a second gas distribution groove. The first gas distribution groove and the second gas distribution groove are arranged opposite each other to form the outer ring gas distribution channel.

[0011] Preferably, the first gas distribution groove includes a first groove and a second groove that are interconnected. In the radial direction of the gas distribution plate, the second groove is located outside the first groove. The width of the first groove in the circumferential direction of the gas distribution plate is smaller than the width of the second groove in the circumferential direction of the gas distribution plate. Part of the gas flowing into the main gas passage passes through the first groove and enters the second groove. The outer flame cap includes an outer ring, a connecting part, and an inner ring arranged sequentially from the outside to the inside. The second gas distribution groove includes an inner ring groove located on the inner ring, a connecting groove located on the connecting part, and an outer ring groove located on the outer ring. The inner ring groove is connected to the main gas passage and the middle ring flame distribution hole. The connecting groove is directly opposite the first groove, and the outer ring groove is directly opposite the second groove.

[0012] Preferably, the ignition structure further includes an ignition groove located at the top of the outer flame cover and extending radially through the outer ring portion of the outer flame cover. The ignition hole connects the ignition groove and the inner ring groove.

[0013] Preferably, the outer flame cap is further provided with an outer ring flame stabilizing groove and an outer ring flame stabilizing hole. The outer ring flame stabilizing groove is an annular groove formed on the annular side wall of the outer flame cap. The annular groove is located below the gas outlet. The outer ring flame stabilizing hole penetrates the outer ring portion. One end of the outer ring flame stabilizing hole forms a first flame stabilizing opening in the outer ring flame stabilizing groove, and the other end of the outer ring flame stabilizing hole forms a second flame stabilizing opening on the inner wall of the inner ring groove.

[0014] Preferably, the gas distribution plate is provided with a first air channel that penetrates the gas distribution plate along its thickness, and the outer burner cap is provided with a second air channel that penetrates the outer burner cap along its thickness. The first air channel and the second air channel are arranged opposite each other to form a secondary air channel. The secondary air channel and the outer ring gas distribution channel are spaced apart in the circumferential direction of the burner. The height of the outer ring gas distribution channel in the vertical direction is greater than the width of the outer ring gas distribution channel in the circumferential direction of the burner.

[0015] Preferably, the inner burner cap is provided with a flame-preserving hole, which penetrates the inner burner cap along its thickness direction. The flame-preserving hole and the middle ring burner hole are located on the same annular surface of the inner burner cap. The outer burner cap is provided with a flame-preserving gas chamber and an inner ring gas guide plate. The flame-preserving gas chamber connects the auxiliary gas passage and the flame-preserving hole. The inner ring gas guide plate is used to guide the gas in the auxiliary gas passage into the flame-preserving hole. The burner also includes a thermocouple, which passes through the secondary air passage and is located at the flame-preserving hole.

[0016] A gas stove includes a burner head and the aforementioned burner. The burner head includes an air pipe, an inner burner pipe, and an outer burner pipe arranged sequentially from the inside out. The inner wall of the outer burner pipe and the outer wall of the inner burner pipe form a main gas passage, and the outer wall of the air pipe and the inner wall of the inner burner pipe form a secondary gas passage. The top ends of the air pipe, the inner burner pipe, and the outer burner pipe are arranged sequentially from top to bottom. A socket is provided at the center of the gas distribution plate, and a through hole communicating with the socket is provided at the center of the outer burner cap. The inner burner cap includes a detachably connected cover body and a cap. The cover body includes an air central channel pipe, and the cap covers the top opening of the air central channel pipe. The air pipe passes through the socket and the through hole and is inserted into the air central channel pipe. The inner burner pipe passes through the socket and is inserted into the through hole. The outer burner pipe is inserted into the gas distribution plate.

[0017] The beneficial effects of this invention are:

[0018] The burner provided by this invention includes a gas distribution plate, an outer burner cap, and an inner burner cap. An outer ring gas distribution channel is formed between the gas distribution plate and the outer burner cap. The outer burner cap is provided with an outer ring flame hole and a middle ring flame distribution hole communicating with the outer ring gas distribution channel. The inner burner cap is provided with a middle ring flame hole and an inner ring flame hole, and the middle ring flame hole communicates with the middle ring flame distribution hole. This burner, by providing a middle ring flame distribution hole on the outer burner cap that connects the middle ring flame hole and the outer ring gas distribution channel, allows a portion of the gas in the main gas passage to be introduced into the middle ring flame hole for combustion, forming a middle ring flame. This increases the heat load of the central flame and improves the thermal efficiency of the burner. Furthermore, a flame transmission hole is provided on the outer burner cap. The center position of the flame transmission hole's inlet is set lower than the center position of the gas outlet of the outer ring flame hole, thus making the flame height at the flame transmission hole lower than the flame height at the outer ring flame hole. This creates a clearance area for the boiler support feet, reducing contact between the boiler support feet and the flame at the clearance area, thereby reducing carbon monoxide production. Attached Figure Description

[0019] Figure 1 This is an exploded view of the burner provided in an embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional view of the burner and furnace head after assembly, as provided in the embodiment of the present invention;

[0021] Figure 3 yes Figure 2 Enlarged view of section A;

[0022] Figure 4 This is a schematic diagram of the gas distribution plate of the burner provided in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the outer flame cap of the burner provided in an embodiment of the present invention from a certain perspective;

[0024] Figure 6 yes Figure 5 Enlarged view of section B;

[0025] Figure 7 This is a schematic diagram of the outer flame cap of the burner provided in an embodiment of the present invention from another perspective;

[0026] Figure 8 This is a schematic diagram of the inner flame cap of the burner provided in an embodiment of the present invention from a certain perspective;

[0027] Figure 9 This is a schematic diagram of the inner flame cap of the burner provided in an embodiment of the present invention from another perspective.

[0028] In the picture:

[0029] 10. Burner;

[0030] 100. Air distribution plate; 110. First air distribution groove; 111. First groove portion; 112. Second groove portion; 120. First air passage; 130. Insertion hole; 140. Annular insertion portion; 150. Assembly protrusion; 151. First assembly hole; 160. First positioning groove; 170. Second positioning groove;

[0031] 200. Outer flame cap; 201. Outer ring; 202. Connecting part; 203. Inner ring; 204. Middle ring flame distribution port; 205. Mixing ring groove; 206. Positioning post; 207. Flame-preserving gas chamber; 208. Inner ring gas guide plate; 209. Annular side wall plate; 210. Outer ring flame hole; 220. Through hole; 230. Second air passage; 240. Second gas distribution groove; 241. Inner ring groove; 242. Connecting groove; 243. Outer ring groove; 250. Flame transmission structure; 251. Flame transmission hole; 252. Flame transmission groove; 260. Outer ring flame stabilizing groove; 270. Outer ring flame stabilizing hole; 280. Second assembly hole;

[0032] 300. Inner burner cap; 301. Cap body; 302. Cap; 303. Central air passage pipe; 304. Inner ring burner section; 305. Middle ring burner section; 306. Secondary combustion chamber; 307. Inner ring burner hole; 308. Middle ring burner hole; 309. Middle ring flame stabilizer groove; 310. Middle ring flame stabilizer hole; 311. Fourth annular stepped surface;

[0033] 400. Outer ring gas distribution channel;

[0034] 500. Secondary air passage;

[0035] 20. Burner head; 21. Main gas passage; 22. Auxiliary gas passage; 23. Air pipe; 24. Inner furnace pipe; 25. Outer furnace pipe. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0039] The following is Figures 1 to 9 The burner 10 of the present invention will be described in detail using an example.

[0040] Figure 1 The specific structure of the burner 10 in this embodiment of the invention is as follows: Figure 1 As shown, the burner 10 includes a gas distribution plate 100, an outer flame cap 200, and an inner flame cap 300 arranged sequentially from bottom to top. The gas distribution plate 100 is located at the bottom layer of the entire burner 10, the outer flame cap 200 covers the gas distribution plate 100, and the inner flame cap 300 covers the gas distribution plate 100. The burner 10 of the present invention can form an outer ring flame, a middle ring flame, and an inner ring flame arranged sequentially from the outside to the inside. The outer ring flame is formed at the outer flame cap 200, and the middle and inner ring flames are formed at the inner flame cap 300.

[0041] It should be noted that burner 10 needs to be used with the burner head 20 of the gas stove. Figure 2 This is a cross-sectional view of the burner 10 and the furnace head 20 assembled according to an embodiment of the present invention, as shown below. Figure 2As shown, a main gas passage 21 and an auxiliary gas passage 22 are formed inside the burner head 20. The main gas passage 21 and the auxiliary gas passage 22 are separated and both are used to supply gas for combustion in the burner 10. The amount of gas flowing in the main gas passage 21 is greater than the amount of gas flowing in the auxiliary gas passage 22.

[0042] In some embodiments, an inner furnace tube 24 and an outer furnace tube 25 are formed within the burner head 20. The outer furnace tube 25 is fitted outside the inner furnace tube 24. The inner wall of the inner furnace tube 24 forms a secondary gas combustion channel 22, and the inner wall of the outer furnace tube 25 and the outer wall of the inner furnace tube 24 form a main gas combustion channel 21. In some embodiments, an air tube 23 is also formed within the burner head 20. The air tube 23 is used to supply air to circulate within the burner head 20. The air tube 23 is fitted inside the inner furnace tube 24. In this case, the outer wall of the air tube 23 and the inner wall of the inner furnace tube 24 form the secondary gas combustion channel 22. That is, both the secondary gas combustion channel 22 and the main gas combustion channel 21 are annular channels. In some more specific embodiments, the height of the top surfaces of the air tube 23, the inner furnace tube 24, and the outer furnace tube 25 gradually decreases to facilitate cooperation with different parts of the burner 10.

[0043] Figure 4 This is a schematic diagram of the gas distribution plate 100 of the burner 10 according to an embodiment of the present invention, as shown below. Figure 4 As shown, the gas distribution plate 100 is disc-shaped, and a first gas distribution groove 110 is provided on the gas distribution plate 100 to form an outer ring gas distribution channel 400, which is connected to the main gas combustion channel 21 of the burner head 20. Specifically, a portion of the structure on the gas distribution plate 100 is recessed to form the first gas distribution groove 110. The first gas distribution groove 110 can be integrally formed during the manufacturing of the gas distribution plate 100, or it can be formed after the gas distribution plate 100 is manufactured through post-processing. In some embodiments, there are multiple first gas distribution grooves 110, which are spaced apart circumferentially on the gas distribution plate 100. In some more specific embodiments, such as Figure 4 As shown, the air distribution plate 100 is provided with four first air distribution slots 110. Of course, in other embodiments, the number of first air distribution slots 110 can be flexibly adjusted according to the needs.

[0044] In some embodiments, the first air distribution groove 110 has an irregular shape, and continuing to refer to... Figure 4As shown, the first gas distribution groove 110 specifically includes a first groove portion 111 and a second groove portion 112 that are interconnected. The width of the first groove portion 111 is approximately the same, and the first groove portion 111 extends radially along the gas distribution plate 100. The second groove portion 112 is located outside the first groove portion 111, and the second groove portion 112 is approximately fan-shaped. After the gas passes through the first groove portion 111, it enters the second groove portion 112. Of course, in other embodiments, the shape of the first gas distribution groove 110 can also be set to other regular or irregular shapes as needed.

[0045] Continue to refer to Figure 4 As shown, a first air passage 120 is provided on the air distribution plate 100. The first air passage 120 penetrates the air distribution plate 100 along its thickness direction and serves as a passage for air to enter the burner 10. In some embodiments, there are multiple first air passages 120, each of which is disposed between two adjacent first air distribution slots 110, for example, as shown in the figure. Figure 4 As shown, the air distribution plate 100 is provided with four first air channels 120. The four first air channels 120 and four first air distribution slots 110 are alternately arranged in the circumferential direction of the air distribution plate 100. Of course, in other embodiments, the number of first air channels 120 can be flexibly adjusted according to the requirements.

[0046] In some embodiments, the first air passage 120 is an oblong through hole extending circumferentially along the air distribution plate 100. Of course, in other embodiments, the shape of the first air passage 120 can also be set as a regular shape hole such as a round hole or a square hole, or it can be an irregular shape hole, as long as it can ensure that a channel is formed that allows air to flow into the burner 10.

[0047] Continue to refer to Figure 4 As shown, a socket 130 is formed in the center of the gas distribution plate 100 to allow the burner head 20 to be inserted. A plurality of first air passages 120 and a plurality of first gas distribution slots 110 are arranged around the socket 130. In some embodiments, the socket 130 is a circular hole. The air pipe 23 and the furnace inner pipe 24 of the burner head 20 are both arranged through the socket 130, and the outer wall surface of the top of the furnace inner pipe 24 is sealed against the inner wall surface of the socket 130, thereby isolating the main gas passage 21 and the auxiliary gas passage 22 within the burner 10.

[0048] like Figure 3As shown, a downwardly protruding annular insertion portion 140 is formed on the gas distribution plate 100 between the insertion hole 130 and the first air passage 120. The annular insertion portion 140 cooperates with the furnace outer tube 25 to realize the assembly of the gas distribution plate 100 and the burner head 20. In some embodiments, a first annular stepped surface is formed at the bottom of the annular insertion portion 140, and a second annular stepped surface adapted to the first annular stepped surface is formed at the top of the furnace outer tube 25. The annular insertion portion 140 and the furnace outer tube 25 are inserted and fitted together, which can improve the fitting accuracy and assembly efficiency of the burner head 20 and the burner 10.

[0049] Figure 5 This is a schematic diagram of the outer flame cap 200 of the burner 10 according to an embodiment of the present invention from a certain perspective. Figure 7 This is a schematic diagram of the outer flame cap 200 of the burner 10 according to an embodiment of the present invention from another perspective, as shown below. Figure 5 and Figure 7 As shown, the outer flame cap 200 is generally round, with a through hole 220 at its center. The through hole 220 of the outer flame cap 200 is directly opposite the insertion hole 130 of the gas distribution plate 100. In some embodiments, the through hole 220 is a circular hole, and the diameter of the through hole 220 is smaller than the diameter of the insertion hole 130. The furnace tube 24 of the burner head 20 passes through the through hole 220, and the air tube 23 of the burner head 20 passes through the through hole 220 and protrudes from the through hole 220. In some more specific embodiments, the through hole 220 is a stepped hole, and the inner wall surface of the through hole 220 forms a third annular stepped surface. The top of the furnace tube 24 of the burner head 20 abuts against the third annular stepped surface, which enables rapid positioning and assembly.

[0050] Continue to refer to Figure 5 and Figure 7 As shown, a second air passage 230 is provided on the outer burner cap 200, and the second air passage 230 penetrates the outer burner cap 200 along the thickness direction of the outer burner cap 200. The second air passage 230 is interconnected with the first air passage 120, and the air entering the first air passage 120 can flow into the second air passage 230 and reach the upper part of the burner 10 through the second air passage 230.

[0051] In some embodiments, the shape of the second air passage 230 is the same as that of the first air passage 120. That is, the second air passage 230 can be configured as an oblong through hole extending circumferentially along the outer burner cap 200, or it can be configured as a regular-shaped hole such as a round hole or a square hole, or an irregular-shaped hole. Of course, in other embodiments, the shape of the second air passage 230 can also be different from that of the first air passage 120, as long as they are interconnected and do not affect the airflow into the burner 10.

[0052] In some embodiments, the number of second air channels 230 is equal to the number of first air channels 120, with each second air channel 230 positioned opposite a first air channel 120. Of course, in other embodiments, the number of second air channels 230 may differ from the number of first air channels 120.

[0053] It should be noted that the interconnected first air passage 120 and second air passage 230 form the secondary air passage 500 of the burner 10. The secondary air passage 500 can provide sufficient air for the combustion gas of the burner 10, avoiding insufficient oxygen from affecting the combustion effect and thermal efficiency.

[0054] Continue to refer to Figure 5 and Figure 7 As shown, the outer flame cap 200 includes an outer ring portion 201, a connecting portion 202, and an inner ring portion 203 arranged sequentially from the outside to the inside. The inner ring portion 203 is formed by a structure on the outer flame cap 200 located between the through hole 220 and the second air passage 230. The connecting portion 202 connects the outer ring portion 201 and the inner ring portion 203, and is formed by a structure on the outer flame cap 200 between two adjacent second air passages 230.

[0055] like Figure 7 As shown, the outer burner cap 200 has an upwardly recessed portion on its bottom surface facing the gas distribution plate 100 to form a second gas distribution groove 240. The second gas distribution groove 240 is interconnected with the first gas distribution groove 110. The gas from the main gas passage 21 enters the second gas distribution groove 240 after passing through the first gas distribution groove 110, ultimately forming a middle ring flame and an outer ring flame. It should be noted that the interconnected first gas distribution groove 110 and second gas distribution groove 240 form the outer ring gas distribution channel 400 of the outer burner cap 200. The outer ring gas distribution channel 400 can divert the gas from the main gas passage 21 to form a middle ring flame and an outer ring flame.

[0056] Traditional burners have a split gas distribution plate structure, consisting of a gas distribution plate base and a lower gas distribution plate cover, with an outer annular gas distribution channel formed between the base and the cover. This structure results in a large number of burner components, requiring the base and cover to be manufactured and assembled separately before being assembled with the outer burner cap. This not only increases costs but also adds to the assembly workload and reduces efficiency. In contrast, the burner 10 provided by this invention designs a second gas distribution groove 240 on the outer burner cap 200, thereby forming an outer annular gas distribution channel 400 between the outer burner cap 200 and the gas distribution plate 100. This eliminates the need for manufacturing and assembling the lower gas distribution plate cover, reducing costs, minimizing assembly workload, and improving efficiency.

[0057] In some embodiments, the height of the outer annular gas distribution channel 400 is greater than its width. This reduces the circumferential width occupied by the outer annular gas distribution channel 400 on the burner 10, which helps to increase the cross-sectional area of ​​the secondary air channel 500. This arrangement allows for a further reduction in the diameter of the burner 10, thereby concentrating the outer annular flame towards the central region of the burner 10. This not only improves the thermal efficiency of the burner 10 but also reduces the materials required to manufacture the burner 10, thus lowering manufacturing costs. In other words, setting the height of the outer annular gas distribution channel 400 to be greater than its width allows for a reduction in the diameter of the burner 10 while maintaining the area of ​​the secondary air channel 500, resulting in a more concentrated heat load, which is beneficial for improving thermal efficiency and ensuring sufficient secondary air supply.

[0058] In some embodiments, the second air distribution groove 240 penetrates the connecting portion 202, and both ends of the second air distribution groove 240 extend to the outer ring portion 201 and the inner ring portion 203, respectively. Specifically, referring to... Figure 7 As shown, the second gas distribution groove 240 includes an inner ring groove 241 located on the inner ring portion 203, a connecting groove 242 located on the connecting portion 202, and an outer ring groove 243 located on the outer ring portion 201. The inner ring groove 241 is connected to the main gas passage 21 and the inner burner cap 300. After the gas in the main gas passage 21 enters the inner ring groove 241, a part of the gas flows into the connecting groove 242 and then into the outer ring groove 243 and finally forms an outer ring flame. The other part flows into the inner burner cap 300 and finally forms a middle ring flame.

[0059] More specifically, there are multiple inner ring grooves 241, each of which is an arc-shaped groove extending circumferentially along the outer burner cap 200. Multiple inner ring grooves 241 are arranged around the through hole 220 and on the same circumference, so that after the outer burner cap 200 and the gas distribution plate 100 are assembled, multiple inner ring grooves 241 can be connected to the annular main gas passage 21.

[0060] To form an outer ring fire, continue to refer to... Figure 5 and Figure 7 As shown, an outer ring flame hole 210 is provided at the outer ring portion 201 of the outer flame cap 200. The outer ring flame hole 210 penetrates the outer ring portion 201 of the outer flame cap 200 and communicates with the outer ring groove 243. The gas flowing to the outer ring groove 243 flows out from the outer ring flame hole 210 and is ignited, thereby forming an outer ring flame.

[0061] In some embodiments, the axis of the outer ring burner hole 210 is set at an angle to the vertical line. For example, the angle can be 45° or 60°. Of course, the angle can be flexibly adjusted according to needs and is not limited to a specific value. One end of the outer ring burner hole 210 forms a gas inlet on the inner wall surface of the outer burner cap 200, and the other end of the outer ring burner hole 210 forms a gas outlet on the outer wall surface of the outer burner cap 200.

[0062] In some embodiments, the number of outer ring flame holes 210 is multiple, and the gas outlets of the multiple outer ring flame holes 210 on the outer wall surface of the outer flame cover 200 are arranged in a circular pattern. That is, multiple gas outlets are arranged at intervals on the outer wall surface of the annular outer flame cover 200, and the distance between two adjacent gas outlets can be equal or unequal. In some embodiments, the cross-sectional shape of the outer ring flame holes 210 along the direction perpendicular to its central axis is circular, and the multiple outer ring flame holes 210 are arranged radially on the outer flame cover 200, which can expand the range of the outer ring flame and improve the heating effect. Of course, in other embodiments, the cross-sectional shape of the outer ring flame holes 210 along the direction perpendicular to its central axis can also be set to other shapes such as square or elliptical as needed.

[0063] Continue to refer to Figure 5 and Figure 7 As shown, the top surface of the outer ring portion 201 of the outer flame cap 200 is a slope, which slopes outward from bottom to top in the vertical direction. In order to ignite the gas released from the outer ring flame hole 210, a flame transfer structure 250 is provided on the outer ring portion 201 of the outer flame cap 200, and the outer ring flame is ignited by the middle ring flame through the flame transfer structure 250.

[0064] In some embodiments, such as Figure 6 As shown, the ignition structure 250 includes an ignition groove 252, which is located at the top of the outer ring portion 201 of the outer flame cap 200 and extends radially through the entire outer ring portion 201. In some embodiments, the ignition structure 250 further includes an ignition hole 251, which connects the ignition groove 252 and the outer ring groove 243 located inside the outer ring portion 201. The ignition hole 251 extends through the outer ring portion 201 of the outer flame cap 200 and communicates with the outer ring groove 243.

[0065] In some embodiments, the ignition hole 251 is a straight hole, and its central axis is inclined relative to the vertical direction. One end of the ignition hole 251 forms a ignition inlet on the outer wall surface of the outer ring portion 201, and the other end forms a ignition outlet on the inner wall surface of the outer ring groove 243. Further, there are multiple ignition holes 251 arranged radially on the outer flame cover 200, and the ignition inlets of the multiple ignition holes 251 are arranged in a circular pattern on the outer flame cover 200. It should be noted that the ignition groove 252 only needs to communicate with one of the ignition holes 251.

[0066] In some more specific embodiments, the cross-sectional shape of the flame-transmitting hole 251 along the direction perpendicular to its central axis is circular, and the diameter of the flame-transmitting hole 251 is smaller than the diameter of the outer ring flame hole 210, thereby serving as a fire-avoiding position for the pot rack footplate. Of course, in other embodiments, the cross-sectional shape of the flame-transmitting hole 251 along the direction perpendicular to its central axis can also be set to other shapes such as square or elliptical, depending on the requirements. In some more specific embodiments, the center position of the flame-transmitting inlet of the flame-transmitting hole 251 is lower than the center position of the gas outlet of the outer ring flame hole 210, thereby reducing the height of the flame in the fire-avoiding position, reducing the contact between the flame in the fire-avoiding position and the footplate, and thus reducing the generation of carbon monoxide (CO).

[0067] Continue to refer to Figure 5 and Figure 7 As shown, the outer flame cap 200 is also provided with an outer ring flame stabilizing groove 260, which is an annular groove formed on the annular side wall of the outer flame cap 200, and the annular groove is located below the gas outlet of the outer ring flame hole 210. Furthermore, the outer flame cap 200 is also provided with an outer ring flame stabilizing hole 270, which penetrates the outer ring portion 201 of the outer flame cap 200. One end of the outer ring flame stabilizing hole 270 forms a first flame stabilizing opening within the outer ring flame stabilizing groove 260, and the other end forms a second flame stabilizing opening on the inner wall of the outer ring groove 243.

[0068] In some embodiments, there are multiple outer ring flame stabilizing holes 270, which are radially arranged on the outer flame cap 200. The first flame stabilizing openings of the multiple outer ring flame stabilizing holes 270 are arranged in a circular pattern within the outer ring flame stabilizing groove 260, and the second flame stabilizing openings of the multiple outer ring flame stabilizing holes 270 are arranged in a circular pattern on the inner wall surface of the outer ring groove 243. The circumference of the second flame stabilizing openings of the multiple outer ring flame stabilizing holes 270 is located outside the circumference of the gas inlet of the multiple outer ring flame holes 210.

[0069] To achieve the assembly of the outer flame cap 200 and the air distribution plate 100, continue to refer to... Figure 4 and Figure 7 As shown, a central mounting protrusion 150 is provided on the inner wall surface of the insertion hole 130 of the air distribution plate 100. A first mounting hole 151 is provided on the mounting protrusion 150, and a second mounting hole 280 is provided on the bottom surface of the inner ring portion 203 of the outer flame cap 200. The first mounting hole 151 and the second mounting hole 280 are arranged opposite each other, and the connector is connected to the first mounting hole 151 and the second mounting hole 280.

[0070] In some embodiments, there are multiple mounting protrusions 150 arranged in a circle on the inner wall of the insertion hole 130. Each mounting protrusion 150 is provided with at least one first mounting hole 151. Correspondingly, multiple second mounting holes 280 are provided on the bottom surface of the inner ring portion 203 of the outer flame cover 200. The multiple second mounting holes 280 are arranged circumferentially around the through hole 220. The first mounting holes 151 and second mounting holes 280 arranged opposite each other are grouped together and connected by a connector. Optionally, the connector is a screw. In one embodiment of the present invention, there are four first mounting holes 151 and four second mounting holes 280. Of course, in other embodiments, the number of first mounting holes 151 and four second mounting holes 280 can be flexibly adjusted according to requirements.

[0071] To improve the assembly stability of the outer flame cap 200 and the gas distribution plate 100, the outer flame cap 200 is fastened onto the gas distribution plate 100. Specifically, the structure on the outer flame cap 200 located outside the outer annular groove 243 forms a downwardly protruding annular sidewall plate 209. The annular sidewall plate 209 is sleeved on the outside of the gas distribution plate 100, and the inner wall surface of the annular sidewall plate 209 abuts against the outer wall surface of the gas distribution plate 100.

[0072] Figure 8 This is a schematic diagram of the inner flame cap 300 of the burner 10 according to an embodiment of the present invention from a certain perspective. Figure 9 This is a structural schematic diagram of the inner flame cap 300 of the burner 10 according to an embodiment of the present invention from another perspective, as shown in Figure 8. Figure 9 As shown, the inner flame cover 300 is generally round, and the size of the inner flame cover 300 is approximately the same as the size of the inner ring portion 203 of the outer flame cover 200. Thus, after the inner flame cover 300 is placed on the outer flame cover 200, the inner flame cover 300 is basically directly opposite the inner ring portion 203 of the outer flame cover 200.

[0073] To improve the assembly precision of the inner flame cap 300 and the outer flame cap 200, continue to refer to... Figure 5 As shown, a positioning post 206 protrudes from the inner ring portion 203 of the outer flame cap 200, and a positioning hole (not shown in the figure) is provided on the inner flame cap 300. By inserting the positioning post 206 into the positioning hole, the positioning of the inner flame cap 300 and the outer flame cap 200 is achieved.

[0074] Specifically, as in 8 and Figure 9As shown, the inner burner cover 300 includes a cap 302 and a cover body 301, which are separately configured. The cover body 301 includes an air center channel pipe 303, an inner ring burner section 304, and a middle ring burner section 305, which are arranged sequentially from the inside to the outside. The cap 302 covers the top of the air center channel pipe 303 to prevent foreign objects from entering the burner 10. In some embodiments, the cap 302 is detachably connected to the top opening of the air center channel pipe 303 to adapt the burner 10 to an anti-dry-burning device.

[0075] The central air channel pipe 303 is used to connect with the air pipe 23 of the burner head 20 through the through hole 220 of the outer flame cap 200. Traditional burners typically have the burner head connected to the gas distribution plate, and the inner flame cap connected to the gas distribution plate. This results in numerous mating and sealing surfaces, poor concentricity between the inner flame cap and the burner head, and uneven gas flow in the inner flame holes. This invention provides a burner 10 with a central air channel pipe 303 on the inner flame cap 300, allowing direct connection between the central air channel pipe 303 and the air pipe 23 of the burner head 20. This reduces the number of mating and sealing surfaces between the burner 10 and the burner head 20, while also improving the concentricity between the inner flame cap 300 and the burner head 20, thus preventing uneven gas flow in the inner flame holes.

[0076] In some embodiments, a fourth annular stepped surface 311 is formed on the outer wall of the central air channel pipe 303. The air pipe 23 of the burner head 20 is sleeved on the outside of the central air channel pipe 303, and the top of the air pipe 23 abuts against the fourth annular stepped surface 311. The fourth annular stepped surface 311 has a limiting function, which can not only limit the assembly height of the inner flame cover 300, but also improve the assembly stability of the inner flame cover 300.

[0077] The inner ring burner 304 is positioned between the top of the central air channel pipe 303 and the top of the middle ring burner 305, forming a downward-opening, annular auxiliary gas chamber 306. The auxiliary gas chamber 306 is located above and communicates with the auxiliary gas passage 22, allowing gas flowing from the auxiliary gas passage 22 to enter the auxiliary gas chamber 306. An inner ring burner hole 307 is provided on the inner ring burner 304, through which gas entering the auxiliary gas chamber 306 flows out and is ignited to form an inner ring flame.

[0078] In some embodiments, the inner ring burner 304 has a conical structure, and multiple layers of inner ring burner holes 307 are provided on the inner ring burner 304 from top to bottom. Each layer of inner ring burner holes 307 includes multiple inner ring burner holes 307 arranged in a circle. The inner ring burner holes 307 included in adjacent layers of inner ring burner holes 307 can be staggered to improve the uniformity of the inner ring flame and ensure the structural strength of the inner burner cover 300. By providing multiple layers of inner ring burner holes 307, a larger total area of ​​inner ring burner holes 307 can be achieved. The larger total area of ​​inner ring burner holes 307 can accommodate a larger inner ring gas flow rate, thereby further increasing the heat load in the central area of ​​the burner 10 and improving thermal efficiency.

[0079] The central ring flame section 305 has a ring structure and is used to abut against the inner ring section 203 of the outer flame cap 200. In some embodiments, the width of the central ring flame section 305 in the radial direction of the inner flame cap 300 is equal to the width of the central ring flame section 305 in the radial direction of the outer flame cap 200. A central ring flame hole 308 is provided through the central ring flame section 305, and the central ring flame hole 308 communicates with the inner ring groove 241 of the outer flame cap 200.

[0080] In some embodiments, there are multiple central ring burner holes 308, which are radially arranged on the inner burner cap 300. The bottom end of each central ring burner hole 308 forms a gas inlet on the annular bottom surface of the central ring burner section 305, and the top end of each central ring burner hole 308 forms a gas outlet on the annular sidewall of the outer burner cap 200. The multiple gas outlets are arranged in a circular pattern on the annular sidewall of the outer burner cap 200. In some embodiments, the cross-sectional shape of the central ring burner hole 308 along the direction perpendicular to its central axis is circular. Of course, in other embodiments, the cross-sectional shape of the central ring burner hole 308 along the direction perpendicular to its central axis can also be a regular shape or an irregular shape such as a square hole or an oblong hole.

[0081] To achieve communication between the middle ring flame hole 308 and the inner ring groove 241 of the outer flame cover 200, refer to Figure 5 and Figure 7 As shown, a central ring flame distribution port 204 is provided through the outer burner cap 200, and the central ring flame distribution port 204 is connected to the inner ring groove 241. After the gas from the main gas passage 21 enters the outer ring distribution passage 400, it is split. A portion of the gas flows out from the outer ring flame port 210 and is ignited to form an outer ring flame, while the other portion flows through the central ring flame distribution port 204 into the inner burner cap 300, flows out from the central ring flame port 308, is ignited, and ultimately forms a central ring flame. Because the gas flow rate in the main gas passage 21 is relatively large, this distribution structure can provide more gas for the central ring flame, thereby increasing the heat load in the central region of the burner 10 and improving the thermal efficiency of the burner 10.

[0082] In some embodiments, there are multiple central ring flare distribution holes 204, with each inner ring groove 241 corresponding to multiple central ring flare distribution holes 204, and the multiple central ring flare distribution holes 204 are arranged in a circle on the outer flame cap 200. In some embodiments, the cross-section of the central ring flare distribution hole 204 is circular. Of course, in other embodiments, the cross-section of the central ring flare distribution hole 204 can be set to other regular or irregular shapes such as square or waist-shaped, depending on the requirements.

[0083] In some embodiments, continue to refer to Figure 5 As shown, a mixing ring groove 205 is provided on the top surface of the inner ring portion 203 of the outer burner cap 200. The mixing ring groove 205 is connected to the middle ring burner distribution hole 204. The gas passing through all the middle ring burner distribution holes 204 is collected in the mixing ring groove 205. The mixing ring groove 205 is also connected to the gas inlet formed on the annular bottom surface of the middle ring burner portion 305 at the bottom end of all the middle ring burner holes 308. In this way, the gas entering the mixing ring groove 205 can be discharged from the inner burner cap 300 through multiple middle ring burner holes 308.

[0084] Continue to refer to Figure 8 As shown, the inner burner cap 300 is also provided with a central ring flame stabilizing groove 309. The central ring flame stabilizing groove 309 is an annular groove formed on the annular side wall of the inner burner cap 300, and the annular groove is located below the gas exhaust port of the central ring burner hole 308. In addition, the inner burner cap 300 is also provided with a central ring flame stabilizing hole 310, which penetrates the central ring burner part 305 of the inner burner cap 300. One end of the central ring flame stabilizing hole 310 forms a third flame stabilizing opening in the central ring flame stabilizing groove 309, and the other end forms a fourth flame stabilizing opening on the bottom surface of the central ring burner part 305.

[0085] In some embodiments, there are multiple central ring flame stabilizing holes 310, which are radially arranged on the inner flame cap 300. The third flame stabilizing openings of the multiple central ring flame stabilizing holes 310 are arranged in a circular pattern within the central ring flame stabilizing groove 309, and the fourth flame stabilizing openings of the multiple central ring flame stabilizing holes 310 are arranged in a circular pattern on the bottom surface of the central ring flame section 305. The circumference of the multiple fourth flame stabilizing openings is located outside the circumference of the gas inlet of the multiple central ring flame holes 308.

[0086] In order to ignite the gas, the gas stove also includes an ignition needle (not shown in the picture). Continue reading... Figure 4 As shown, a first positioning groove 160 is also provided on the air distribution plate 100. The first positioning groove 160 is used to position the ignition needle. Specifically, the first positioning groove 160 is provided on the inner wall of any one of the first air channels 120. The first positioning groove 160 is an arc-shaped groove. The ignition needle is roughly cylindrical. The ignition needle passes through the first air channel 120 and part of the ignition needle abuts against the arc-shaped groove to complete the positioning.

[0087] The gas stove also includes a thermocouple (not shown in the figure). When heated, the thermocouple generates electrical energy, which keeps the control valve that controls the gas passage open, thus ensuring a continuous gas supply. (Continue to refer to...) Figure 4 As shown, a second positioning groove 170 is also provided on the air distribution plate 100, and the first positioning groove 160 is used to position the thermocouple. Specifically, the second positioning groove 170 can be provided on the inner wall surface of any of the first air channels 120. In some embodiments, the second positioning groove 170 and the first positioning groove 160 are formed on the inner wall surface of the same first air channel 120. In some embodiments, the second positioning groove 170 is an arc-shaped groove, and the thermocouple passes through the first air channel 120 with part of the thermocouple abutting against the arc-shaped groove to complete the positioning.

[0088] To ensure that burner 10 has good flame retention performance, continue to refer to Figure 5 As shown, an inner ring gas guide plate 208 and a flame-preserving gas chamber 207 are provided on the outer burner cap 200. The flame-preserving gas chamber 207 and the mixing ring groove 205 are located on the same circumference of the outer burner cap 200. A flame-preserving hole is provided on the inner burner cap 300, penetrating the middle ring burner section 305 of the inner burner cap 300. It should be noted that the structure of the flame-preserving hole and the middle ring burner hole 308 are not different, and both are located on the same annular surface of the inner burner cap 300. The only difference is their position on the inner burner cap 300, which results in the flame-preserving hole not communicating with the middle ring burner distribution hole 204, while the middle ring burner hole 308 is connected to the middle ring burner distribution hole 204.

[0089] The flame-preserving gas chamber 207 is connected to the auxiliary gas passage 22 and the flame-preserving hole. When the gas stove is in low flame mode, the main gas passage 21 is closed. Part of the gas entering the auxiliary gas chamber 306 from the auxiliary gas passage 22 is blocked by the inner ring gas guide plate 208 and then introduced into the flame-preserving gas chamber 207. The flame-preserving gas chamber 207 is connected to the flame-preserving hole, so that the gas can be burned through the flame-preserving hole in low flame mode and the flame can be detected by the thermocouple set near the flame-preserving hole, so that the thermocouple is always in working state, ensuring that the burner 10 has good flame-preserving characteristics in both high and low flame modes.

[0090] The burner 10 provided in this embodiment of the invention has the following advantages:

[0091] 1. The burner 10 increases the central fire heat load and improves the thermal efficiency of the burner 10 by providing a central ring fire distribution hole 204 in the outer fire cover 200 to distribute a portion of the gas in the outer ring distribution channel 400 to the central ring fire hole 308 in the inner fire cover 300.

[0092] 2. The burner 10 places the thermocouple between the middle ring flame hole 308 and the outer ring flame hole 210, and by setting the inner ring gas guide plate 208 and the flame-preserving gas chamber 207 on the outer flame cover 200, part of the inner ring gas during the low flame is introduced into the flame-preserving hole near the thermocouple, thereby ensuring that the burner 10 has good flame-preserving performance during the low flame.

[0093] 3. The outer ring gas distribution channel 400 of the burner 10 has a height greater than its width, which reduces the diameter of the burner 10 while ensuring that the area of ​​the secondary air channel 500 is sufficient. This makes the heat load more concentrated, which is conducive to improving thermal efficiency and ensuring sufficient secondary air supply.

[0094] 4. The burner 10 has a second gas distribution groove 240 on the outer flame cover 200, which makes the outer flame cover 200 take on the function of the gas distribution plate cover in the traditional burner. That is, the traditional gas distribution plate cover and the outer flame cover are designed as an integrated structure, which reduces the number of parts to be assembled and facilitates processing and assembly.

[0095] 5. The burner 10 has a unique feature that allows the inner flame cap 300 to be assembled with the burner head 20, so that the inner flame cap 300 and the burner head 20 can be inserted and matched, instead of the inner flame cap being assembled with the outer flame cap in traditional burners. The insertion and matching of the inner flame cap 300 and the burner head 20 can reduce the sealing surface and assembly surface, improve the concentricity of the inner flame cap 300 and the burner head 20, and because the burner 10 has a secondary air internal channel in the center, it can enhance the air supply to the inner ring flame and ensure complete combustion.

[0096] 6. The burner 10 reduces the flame height of the flame hole in the fire avoidance position by setting the center position of the flame hole 251 on the outer flame cover 200 to be lower than the center position of the outer ring flame hole 210, thereby preventing the flame from burning the foot plate and reducing the generation of smoke.

[0097] The present invention also provides a gas stove, which includes a burner 20 and the burner 10 mentioned above. By using the burner 10, the gas stove has the characteristics of small size, simple assembly, large central heat load, high thermal efficiency and excellent comprehensive performance.

[0098] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A burner, characterized by include: Gas distribution plate (100); An outer flame cover (200) is provided above the gas distribution plate (100), and the gas distribution plate (100) is provided with a first gas distribution groove (110). The outer flame cover (200) is provided with a second gas distribution groove (240). The first gas distribution groove (110) and the second gas distribution groove (240) are arranged opposite each other to form an outer ring gas distribution channel (400). The outer ring gas distribution channel (400) can be connected to the main gas passage (21) of the burner head (20). The outer flame cover (200) is provided with an outer ring flame hole (210) that is connected to one end of the outer ring gas distribution channel (400). The outer ring flame hole (210) forms a gas outlet on the outer wall surface of the outer flame cover (200). The outer flame cover (200) is also provided with a middle ring flame gas distribution hole (204) that is connected to the other end of the outer ring gas distribution channel (400). An inner flame cover (300) is provided on top of the outer flame cover (200). The inner flame cover (300) is provided with a middle ring flame hole (308) and an inner ring flame hole (307). The middle ring flame hole (308) is located outside the inner ring flame hole (307). The middle ring flame hole (308) is connected to the middle ring flame distribution hole (204). The inner ring flame hole (307) can be connected to the auxiliary gas passage (22) of the burner head (20). The outer flame cover (200) is also provided with a flame transmission structure (250). The flame transmission structure (250) is used to enable the flame of the middle ring fire generated at the middle ring fire hole (308) to ignite the gas at the outer ring fire hole (210) to form an outer ring fire. The flame transmission structure (250) includes a flame transmission hole (251). The diameter of the flame transmission hole (251) is smaller than the diameter of the outer ring fire hole (210). The flame transmission hole (251) penetrates the outer flame cover (200) and forms a flame transmission inlet on the outer wall surface of the outer flame cover (200). The center position of the flame transmission inlet is lower than the center position of the gas outlet to form a relief position for the pot rack foot piece.

2. The burner according to claim 1, characterized in that, The central ring flame hole (308) forms a gas exhaust port on the annular side wall of the inner flame cover (300); The inner flame cap (300) is provided with a middle ring flame stabilizing groove (309) and a middle ring flame stabilizing hole (310). The middle ring flame stabilizing groove (309) is provided on the annular side wall of the inner flame cap (300) and located below the gas outlet. The middle ring flame stabilizing groove (309) is connected to the middle ring flame distribution hole (204) through the middle ring flame stabilizing hole (310).

3. The burner according to claim 2, characterized in that, The outer flame cap (200) has a mixing ring groove (205) on its top surface facing the inner flame cap (300). The mixing ring groove (205) connects the middle ring flame distribution hole (204), the middle ring flame stabilizing hole (310), and the middle ring flame hole (308).

4. The burner according to claim 1, characterized in that, The first gas distribution groove (110) includes a first groove (111) and a second groove (112) that are interconnected. The second groove (112) is located outside the first groove (111) in the radial direction of the gas distribution plate (100). The width of the first groove (111) in the circumferential direction of the gas distribution plate (100) is smaller than the width of the second groove (112) in the circumferential direction of the gas distribution plate (100). Part of the gas flowing into the main gas passage (21) passes through the first groove (111) and enters the second groove (112). The outer flame cap (200) includes an outer ring portion (201), a connecting portion (202), and an inner ring portion (203) arranged sequentially from the outside to the inside. The second gas distribution groove (240) includes an inner ring groove (241) located on the inner ring portion (203), a connecting groove (242) located on the connecting portion (202), and an outer ring groove (243) located on the outer ring portion (201). The inner ring groove (241) is connected to the main gas passage (21) and the middle ring flame distribution hole (204). The connecting groove (242) is directly opposite to the first groove portion (111), and the outer ring groove (243) is directly opposite to the second groove portion (112).

5. The burner according to claim 4, characterized in that, The ignition structure (250) further includes an ignition groove (252), which is located at the top of the outer flame cover (200) and extends radially through the outer ring portion (201) of the outer flame cover (200). The ignition hole (251) connects the ignition groove (252) and the inner ring groove (241).

6. The burner according to claim 4, characterized in that, The outer flame cap (200) is also provided with an outer ring flame stabilizing groove (260) and an outer ring flame stabilizing hole (270). The outer ring flame stabilizing groove (260) is an annular groove formed on the annular side wall of the outer flame cap (200). The annular groove is located below the gas outlet. The outer ring flame stabilizing hole (270) penetrates the outer ring portion (201). One end of the outer ring flame stabilizing hole (270) forms a first flame stabilizing opening in the outer ring flame stabilizing groove (260), and the other end of the outer ring flame stabilizing hole (270) forms a second flame stabilizing opening on the inner wall of the inner ring groove (241).

7. The burner according to claim 1, characterized in that, The gas distribution plate (100) is provided with a first air passage (120), which penetrates the gas distribution plate (100) along the thickness of the gas distribution plate (100). The outer burner cap (200) is provided with a second air passage (230), which penetrates the outer burner cap (200) along the thickness direction of the outer burner cap (200). The first air passage (120) and the second air passage (230) are arranged opposite each other to form a secondary air passage (500). The secondary air passage (500) and the outer ring gas distribution passage (400) are spaced apart in the circumferential direction of the burner. The height of the outer annular gas distribution channel (400) in the vertical direction is greater than the width of the outer annular gas distribution channel (400) in the circumferential direction of the burner.

8. The burner according to claim 7, characterized in that, The inner flame cap (300) is provided with a flame-keeping hole, which penetrates the inner flame cap (300) along the thickness direction. The flame-keeping hole and the middle ring flame hole (308) are located on the same ring surface of the inner flame cap (300). The outer flame cap (200) is provided with a flame-preserving gas chamber (207) and an inner ring gas guide plate (208). The flame-preserving gas chamber (207) is connected to the auxiliary gas passage (22) and the flame-preserving hole. The inner ring gas guide plate (208) is used to guide the gas in the auxiliary gas passage (22) into the flame-preserving hole. The burner also includes a thermocouple, which is disposed through the secondary air passage (500) and at the flame-preserving hole.

9. A gas stove, characterized in that, The burner includes a burner head (20) and a burner according to any one of claims 1-8. The burner head (20) includes an air pipe (23), an inner furnace pipe (24), and an outer furnace pipe (25) arranged sequentially from the inside to the outside. The inner wall of the outer furnace pipe (25) and the outer wall of the inner furnace pipe (24) form a main gas passage (21). The outer wall of the air pipe (23) and the inner wall of the inner furnace pipe (24) form a secondary gas passage (22). The top ends of the air pipe (23), the inner furnace pipe (24), and the outer furnace pipe (25) are arranged sequentially from top to bottom. The gas distribution plate (100) is provided with an insertion hole (130) at its center, and the outer flame cover (200) is provided with a through hole (220) communicating with the insertion hole (130) at its center. The inner flame cover (300) includes a cover body (301) and a cap (302) that can be detachably connected. The cover body (301) includes an air center channel pipe (303). The cap (302) covers the top opening of the air center channel pipe (303). The air pipe (23) passes through the insertion hole (130) and the through hole (220) and is inserted into the air center channel pipe (303). The furnace inner pipe (24) passes through the insertion hole (130) and is inserted into the through hole (220). The furnace outer pipe (25) is inserted into the gas distribution plate (100).

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