Fire distribution structure and burner thereof

Abstract

The fire distribution structure comprises a fire distributor, the fire distributor comprises an outer ring gas cavity with an upward opening, a gas inlet is formed in the cavity bottom face of the outer ring gas cavity, a first gradual change face and a second gradual change face are formed on the cavity bottom face of the outer ring gas cavity, and the first gradual change face and the second gradual change face are arranged in the outer ring gas cavity. The second gradual change face is located on the radial inner side of the first gradual change face, and the first gradual change face and the second gradual change face both extend in the clockwise direction from the fuel gas inlet and rise gradually. According to the fire distribution structure, the gas outlet pressure at the gas inlet can be reduced, and the phenomenon that flames are not uniform due to the fact that the local flow speed is too high is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of gas stove technology, and in particular to a flame distribution structure and its burner. Background Technology

[0002] The existing one-button stir-fry burner has a central ring flame cap diameter greater than 40mm. The flame is emitted from the side of the central ring flame cap at a certain angle. The high-temperature area of ​​the flame is within an 80mm diameter range of the bottom of the wok, which easily results in a low temperature in the center of the wok. When the heat of the central ring flame is increased by 10%, although the central ring flame lengthens, the flame change is not significant, and the high-temperature area of ​​the wok will extend further outward to an area within a 90mm diameter range of the bottom, which is not conducive to the needs of fast stir-frying.

[0003] In addition, when the outer ring mixed gas is ejected from the distributor of the existing burner, the gas pressure at the gas inlet of the distributor is too high, which causes the gas velocity in the vicinity to be too fast, resulting in unstable and uneven flame and high CO content in the gas. Summary of the Invention

[0004] This invention aims to at least partially solve one of the problems existing in the prior art. To this end, this invention proposes a flame distribution structure that can reduce the outlet pressure at the gas inlet and effectively improve the phenomenon of uneven flame caused by excessively high local flow velocity. This invention also provides a burner.

[0005] According to the above-mentioned fire distribution structure, it is achieved through the following technical solution:

[0006] A flame distribution structure includes a flame distributor, the flame distributor comprising: an upwardly opening outer annular gas chamber, a gas inlet formed on the bottom surface of the outer annular gas chamber, a first gradient surface and a second gradient surface formed on the bottom surface of the outer annular gas chamber, the second gradient surface being located radially inside the first gradient surface, both the first gradient surface and the second gradient surface extending clockwise from the gas inlet and gradually rising upwards.

[0007] In some embodiments, the width of the first gradient surface in the radial direction gradually increases from the gas inlet in a clockwise direction, and the width of the second gradient surface in the radial direction gradually decreases from the gas inlet in a clockwise direction; and / or the second gradient surface extends radially inward from the first gradient surface and is arranged to be inclined or curved upward.

[0008] In some embodiments, the arc length of the first gradient surface is greater than the arc length of the second gradient surface; the arc length of the second gradient surface is greater than the circumference of the inner wall of the outer annular air cavity, and less than the circumference of the inner wall of the outer annular air cavity.

[0009] In some embodiments, an arcuate surface is provided between the higher end of the first gradient surface and the gas inlet, the arcuate surface gradually rising from the gas inlet toward the higher end of the first gradient surface and upward, and / or the arcuate surface gradually rising radially from the outside in and upward.

[0010] In some embodiments, the fire distributor further includes a middle annular air chamber with openings at both the upper and lower ends and a direct jet chamber with openings at both the upper and lower ends. The middle annular air chamber is disposed between the outer annular air chamber and the direct jet chamber, and a secondary air passage is formed between the middle annular air chamber and the outer annular air chamber.

[0011] In some embodiments, a plurality of external connecting ribs arranged at intervals in the circumferential direction are connected between the outer surface of the inner cavity wall of the outer annular air cavity and the outer surface of the outer cavity wall of the middle annular air cavity; and a plurality of internal connecting ribs arranged at intervals in the circumferential direction are connected between the outer surface of the side cavity wall of the direct jet chamber and the inner surface of the outer cavity wall of the middle annular air cavity.

[0012] In some embodiments, a radial groove that is arranged in the radial direction and opens downward is recessed at the bottom of the outer connecting rib.

[0013] In some embodiments, an inwardly extending positioning block is provided on the inner surface of the outer wall of the middle annular air cavity, and / or two outwardly extending protrusions are provided on the outer surface of the outer wall of the middle annular air cavity, with a positioning notch formed between the two protrusions.

[0014] In some embodiments, a baffle plate is also included, which is detachably installed in the outer annular gas chamber and located directly above the gas inlet, and the baffle plate is provided with a plurality of gas equalization holes.

[0015] The burner provided above is achieved through the following technical solution:

[0016] A burner includes: a burner head structure having an upwardly opening outer mixing chamber, a middle mixing chamber, and a direct injection mixing chamber, wherein the outer mixing chamber is disposed outside the middle mixing chamber, and the direct injection mixing chamber is disposed inside the middle mixing chamber; a flame distribution structure as described above, installed on the top of the burner head structure, the flame distribution structure having an outer annular gas chamber, a middle annular gas chamber, and a direct injection chamber, wherein the outer annular gas chamber is connected to the outer mixing chamber through a gas inlet, the middle annular gas chamber is connected to the middle mixing chamber, and the direct injection chamber is connected to the direct injection mixing chamber; and a flame cap structure including an outer annular flame cap and a middle annular flame cap, wherein the outer annular flame cap is disposed on the top of the outer annular gas chamber, and the middle annular flame cap is disposed on the top of the middle mixing chamber and the top of the direct injection mixing chamber, respectively.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] 1. The flame distribution structure of this utility model provides a first gradient surface and a second gradient surface on the bottom surface of the outer annular gas chamber of the flame distributor. Both the first gradient surface and the second gradient surface extend clockwise from the gas inlet and gradually rise upwards, which helps to reduce the gas outlet pressure at the gas inlet and effectively improves the phenomenon of uneven flame caused by excessive local flow velocity.

[0019] 2. By adding a baffle plate above the gas inlet to the outer ring gas chamber of the flame spreader, and distributing multiple equalization holes evenly on the baffle plate, the outer ring mixed gas is prevented from being directly ejected upward from the gas inlet. Most of the gas flows clockwise along the baffle plate, and a small portion of the gas flows upward through the equalization holes on the baffle plate. This portion of the gas is slowed down by the holes in the baffle plate, reducing the gas flow velocity and preventing the flame of the outer ring flame at the corresponding gas inlet from being too long. Attached Figure Description

[0020] Figure 1 This is an exploded view of the fire distribution structure in an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the fire separation structure in an embodiment of this utility model;

[0022] Figure 3 This is a cross-sectional view of the fire separation structure in an embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the flame divider in an embodiment of this utility model;

[0024] Figure 5 This is a structural schematic diagram of the fire distributor from another angle in an embodiment of this utility model;

[0025] Figure 6 This is a schematic diagram of the structure of the gas stove in an embodiment of this utility model;

[0026] Figure 7 This is an exploded view of the burner in an embodiment of this utility model;

[0027] Figure 8 This is a cross-sectional view of the burner in an embodiment of the present invention. Figure 1 ;

[0028] Figure 9 This is a cross-sectional view of the burner in an embodiment of the present invention. Figure 2 .

[0029] In the diagram: 1-furnace head structure, 11-furnace head body, 111-external mixing chamber, 112-intermediate mixing chamber, 113-direct injection mixing chamber, 12-external ejector tube, 13-intermediate ejector tube, 14-direct injection ejector.

[0030] 2-Distributor, 21-Outer ring gas chamber, 211-Gas inlet, 212-First gradient surface, 213-Second gradient surface, 214-Arc-shaped surface, 22-Middle ring gas chamber, 221-Inner connecting rib, 222-Positioning block, 23-Direct jet chamber, 24-Secondary air passage, 241-Outer connecting rib, 242-Radial groove, 243-Protrusion, 244-Positioning notch, 25-Fixing seat, 26-Positioning rib; 3-Baffle plate, 31-Gas equalization hole, 32-Connecting arm, 331-First notch, 332-Second notch, 34-Positioning hole;

[0031] 4-Outer ring flame cap, 41-Outer ring chamber, 411-Outer ring flame hole; 5-Flame cap body, 51-Middle ring chamber, 52-Upper chamber, 53-Direct jet chamber; 6-Direct jet flame cap;

[0032] 7-Plug valve, 712-Outer ring outlet, 722-Middle ring air passage, 723-Stir-fry air passage, 74-Solenoid valve, 751-Outer ring air pipe, 752-Middle ring air pipe, 753-Stir-fry air pipe;

[0033] 8-Ignition assembly. Detailed Implementation

[0034] The following embodiments illustrate the present invention, but the present invention is not limited to these embodiments. Modifications to the specific implementation of the present invention or equivalent substitutions for some technical features, without departing from the spirit of the present invention, should all be covered within the scope of the technical solution claimed by the present invention.

[0035] Example 1

[0036] refer to Figure 1-5 This embodiment provides a flame distribution structure, including a flame distributor 2. The flame distributor 2 includes an outer annular gas chamber 21 with an upward opening, a middle annular gas chamber 22 with openings at both the upper and lower ends, and a direct jet chamber 23 with openings at both the upper and lower ends. The direct jet chamber 23 is located in the inner ring of the middle annular gas chamber 22, and the outer annular gas chamber 21 is located around the middle annular gas chamber 22. A secondary air channel 24 is formed between the middle annular gas chamber 22 and the outer annular gas chamber 21 to allow secondary air to pass through, thereby enabling the secondary air required for combustion of the middle annular gas chamber to be supplemented through the secondary air channel 24.

[0037] A gas inlet 211 is provided on the bottom surface of the outer annular gas cavity 21. A first gradient surface 212 and a second gradient surface 213 are formed on the bottom surface of the outer annular gas cavity 21. The second gradient surface 213 is located radially inside the first gradient surface 212. Both the first gradient surface 212 and the second gradient surface 213 extend clockwise from the gas inlet 211 and gradually rise, so that the outer annular gas cavity 21 is a gently sloping gradient channel. Correspondingly, the outlet of the gas inlet 211 has a flared structure, which helps to increase the volume of the outlet of the gas inlet 211, reduce the gas pressure at the gas inlet 211, and effectively improve the phenomenon of uneven flame caused by excessive local flow velocity.

[0038] refer to Figure 3-5 Furthermore, the width of the first gradient surface 212 in the radial direction gradually increases from the gas inlet 211 in a clockwise direction, and the width of the second gradient surface 213 in the radial direction gradually decreases from the gas inlet 211 in a clockwise direction; and / or the second gradient surface 213 extends radially from the first gradient surface 212 and is arranged with an upward inclination or curvature, so that the second gradient surface 213 is arranged with a lower radial outer end and a higher radial inner end, which is beneficial for guiding the airflow upward. In this embodiment, the arc length of the first gradient surface 212 is greater than the arc length of the second gradient surface 213; the arc length of the second gradient surface 213 is greater than 1 / 2 the circumference of the inner wall of the outer annular gas cavity 21, and less than the circumference of the inner wall of the outer annular gas cavity 21.

[0039] An arc-shaped surface 214 is provided between the higher end of the first gradient surface 212 and the gas inlet 211, that is, an arc-shaped surface 214 is provided at the right end of the gas inlet 211 in a clockwise direction. The arc-shaped surface 214 gradually rises from the gas inlet 211 towards the higher end of the first gradient surface 212, that is, the arc-shaped surface 214 extends from the gas inlet 211 in a counterclockwise direction and gradually rises upward, and / or the arc-shaped surface 214 gradually rises from the outside to the inside and upward in the radial direction. Thus, by cooperating with the first and second gradient surfaces, the volume at the outlet of the gas inlet 211 is further increased, which is more conducive to reducing the outlet gas pressure at the gas inlet 211.

[0040] refer to Figure 4-5 Multiple external connecting ribs 241, spaced apart in the circumferential direction, connect the outer surface of the inner wall of the outer annular air chamber 21 to the outer surface of the outer wall of the middle annular air chamber 22. These external connecting ribs 241 divide the secondary air passage 24 into multiple parts, thereby reliably connecting the outer annular air chamber 21 and the middle annular air chamber 22 into one unit. Similarly, multiple internal connecting ribs 221, spaced apart in the circumferential direction, connect the outer surface of the side wall of the direct jet chamber 23 to the inner surface of the outer wall of the middle annular air chamber 22, ensuring a reliable connection between the direct jet chamber 23 and the middle annular air chamber 22. A radially recessed groove 242, arranged in the radial direction and opening downwards, is provided at the bottom of the external connecting ribs 241 to save material.

[0041] refer to Figure 2-4 A positioning block 222 extending inward is provided on the upper end of the inner surface of the inner wall of the middle ring gas chamber 22. The positioning block 222 is located above the inner connecting rib 221 and is used to pre-position the middle ring burner cap of the burner; and / or two protrusions 243 extending outward are provided on the outer surface of the inner wall of the middle ring gas chamber 22. A positioning notch 244 is formed between the two protrusions 243. The positioning notch 244 is used for the ignition assembly 8 in the burner to pass through vertically.

[0042] Example 2

[0043] refer to Figure 1-3 The difference between this embodiment and embodiment 1 is that it also includes a baffle plate 3. The baffle plate 3 is detachably installed in the outer ring gas chamber 21 and located directly above the gas inlet 211. The baffle plate 3 is provided with multiple gas equalization holes 31 to prevent the outer ring mixed gas from being directly ejected upward from the gas inlet 211. Most of the gas flows clockwise along the baffle plate 3, and a small part of the gas flows upward through the gas equalization holes 31 on the baffle plate 3. This part of the gas is slowed down by the holes of the baffle plate, and the gas flow rate is reduced, preventing the flame of the outer ring fire at the corresponding gas inlet from being too long. In addition, the gas equalization holes 31 on the baffle plate 3 can play a role in equalizing the gas, and the baffle plate 3, to a certain extent, prevents the combustion heat from radiating downward to the burner structure through the gas inlet 211, which helps to reduce the temperature rise of the burner structure.

[0044] Specifically, the two opposite ends of the baffle plate 3 in the radial direction abut against the inner and outer walls of the outer annular gas chamber 21, respectively, to reliably limit the baffle plate in the radial direction. The baffle plate 3 is covered with equalizing holes. Two fixing seats 25 are protruding from the inner surface of the outer wall of the outer annular gas chamber 21, respectively located on opposite sides of the gas inlet 211. Connecting arms 31 extending along the length direction are protruding from opposite ends of the baffle plate 3, and the connecting arms 31 are detachably connected to the corresponding fixing seats 25 by fasteners (e.g., screws). Furthermore, a support platform (not shown in the figure) is protruding from the inner wall of the outer annular gas chamber 21, which abuts against the radially inner end of the bottom of the baffle plate 3.

[0045] A positioning structure is provided between the radial outer end of the baffle plate 3 and the outer wall of the outer annular air cavity 21. The positioning structure includes a positioning rib 26 and a positioning hole 34. The positioning rib 26 extending toward the baffle plate 3 is integrally formed on the inner surface of the outer wall of the outer annular air cavity 21. The positioning hole 34 is recessed at the radial outer end of the positioning rib 26 corresponding to the position of the positioning rib. The positioning hole 34 cooperates with the positioning rib 26 to pre-position the baffle plate 3 and prevent the baffle plate 3 from shifting in the circumferential direction.

[0046] refer to Figure 1-2 A first notch 331 and a second notch 332 are provided at opposite ends along the length of the baffle 3. The size of the first notch 331 is smaller than that of the second notch 332. Both the first notch 331 and the second notch 332 are used to allow the outer ring gas to pass upward.

[0047] Example 3

[0048] refer to Figure 6-9 This embodiment of a burner includes a burner head structure 1, a burner cap structure, and a flame distribution structure as described in Embodiment 1 or 2. The burner head structure 1 includes a burner head body 11, an ejector assembly, and a direct injection ejector 14. The burner head body 11 of the burner head structure 1 has an upward-opening outer mixing chamber 111, an upward-opening intermediate mixing chamber 112, an upward-opening direct injection mixing chamber 113, and a transversely arranged gas receiving channel 1131. The outer mixing chamber 111 is located outside the intermediate mixing chamber 112 and is arranged side by side with the intermediate mixing chamber 112 in the same direction with the intermediate mixing chamber 112 at intervals, so that the outer mixing chamber 111 is eccentrically arranged. Compared with the annular outer mixing chamber of the existing burner head, the burner head structure of this embodiment has a smaller overall size in the radial direction, and its outer mixing chamber 111 does not have the resistance loss caused by the turning flow channel, which is beneficial to the primary air coefficient of the outer ring flame and improves the mixing effect of the outer ring fuel gas and air.

[0049] The direct injection mixing chamber 113 is located within the intermediate mixing chamber 112. One end of the gas inlet channel 1131 extends outward to the outer wall of the burner body 11, while the other end extends inward into the intermediate mixing chamber 112 and connects with the direct injection mixing chamber 113. When the direct injection mixed gas flows upward from the direct injection mixing chamber 113 and is ignited on the middle ring flame cap of the burner, a direct injection flame or a stir-fry flame is formed, thus adding a flame column and increasing the firepower by about 10%. This further increases the center temperature of the pan, speeds up the stir-frying process, and effectively enhances the visibility of the stir-fry flame. The ejector assembly is detachably installed on the burner body 11 and includes an outer ejector tube 12 and a middle ejector tube 13 arranged in the same direction and side by side. The outer ejector tube 12 is connected to the outer mixing chamber 111, and the middle ejector tube 13 is connected to the intermediate mixing chamber 112. The direct injection ejector 14 is detachably installed on the air inlet end of the air inlet channel 1131, so that the primary air injection of the direct injection fire is independent of the intermediate ring fire, which is beneficial to improving the stability of the direct injection fire.

[0050] The flame distribution structure is installed on top of the burner head structure 1. The flame distribution structure includes an outer annular gas chamber 21, a middle annular gas chamber 22, and a direct injection chamber 23. The outer annular gas chamber 21 is connected to the outer mixing chamber 111 through the gas inlet 211, the middle annular gas chamber 22 is connected to the middle mixing chamber 112, and the direct injection chamber 23 is connected to the direct injection mixing chamber 113. The burner structure includes an outer annular burner cover 4 and a middle annular burner cover (not shown in the figure). The outer annular burner cover 4 is installed on top of the outer annular gas chamber 21, and the middle annular burner cover is installed on top of the middle mixing chamber 112 and the direct injection mixing chamber 113, respectively.

[0051] When the outer ring gas flows out from the outer ring outlet 712 of the stopcock valve 7, it passes through the outer ring gas pipe 751, the outer injector pipe 12 and the outer mixing chamber 111 of the burner structure 1, and the outer ring gas chamber 21 of the flame distributor 2, and finally flows out from the outer flame cap 4 and is ignited, forming an outer ring flame. See [link to documentation]. Figure 6-8 When the central ring gas flows out from the gas supply channel of the stopcock valve 7, it is divided into two parts. One part passes sequentially through the central ring gas channel 722, the central ring gas pipe 752, the central injector pipe 13 and the central mixing chamber 112 of the burner head structure 1, and the central ring gas chamber 22 of the flame distributor 2. Finally, it flows out from the central ring flame cap and is ignited to form a central ring flame. See [link to relevant documentation]. Figure 6-8 The other part passes sequentially through the stir-fry gas duct 723, the stir-fry gas pipe 753, the direct injection ejector 14 and the direct injection mixing chamber 113 of the burner structure 1, and the direct injection gas chamber 23 of the burner distributor 2, finally flowing upward from the central ring burner cap and being ignited to form a direct injection flame, i.e., a stir-fry flame. See [link to relevant documentation]. Figure 6-9 A solenoid valve 74 is provided on the stir-fry air passage 723 of the stopcock valve 7. The solenoid valve 74 is used to control the opening and closing of the stir-fry air passage 723.

[0052] It is evident that when the gas stove activates the one-touch high-heat function, an additional flame column is added to the center of the top of the middle ring burner cap, increasing the heat by approximately 10%. This further raises the center temperature of the pan, accelerating the cooking process and enhancing the visibility and stability of the high-heat function. Furthermore, because the outer ring gas chamber 21 of the burner 2 features a gently sloping, gradually changing channel, it helps increase the volume at the outlet of the gas inlet 211, reducing the outlet pressure and effectively mitigating the uneven flame caused by excessively high local flow rates.

[0053] refer to Figure 7-9 The outer flame cap 4 has a downward-opening outer annular gas chamber 41. Multiple outer annular flame holes 411 are provided on the outer side wall or top of the outer flame cap 4. The outer annular flame holes 411 are connected to the outer annular gas chamber 21 of the distributor 2 through the outer annular gas chamber 41. The middle annular flame cap includes a flame cap body 5 and a direct-injection flame cap 6. The flame cap body 5 has a middle annular gas chamber 51, a direct-injection chamber 53, and a main flame hole group (not shown in the figure). The main flame hole group is connected to the middle annular gas chamber 22 of the distributor 2 through the middle annular gas chamber 51. The lower end of the direct-injection chamber 53 is connected to the direct-injection chamber 23 of the distributor 2. The direct-injection flame cap 6 is installed on the top of the flame cap body 5 and has densely distributed top flame holes. The direct-injection flame cap 6 can be connected only to the direct-injection chamber 53; alternatively, it can be connected to both the middle annular gas chamber 51 and the direct-injection chamber 53. In this embodiment, the direct injection burner cap 6 is connected to the central ring gas chamber 51 and the direct injection chamber 53 respectively. This way, even when the gas stove is not activated for stir-frying, a dense small flame can be formed on the top of the central ring burner cap (i.e., the direct injection burner cap 6), which solves the problem of low pot temperature due to no flame at the top when the burner is not activated for stir-frying.

[0054] Specifically, an upper gas chamber 52 with an upward opening is recessed at the top of the burner cap body 5. The upper gas chamber 52 is connected to the outer ring gas chamber 51 and the direct injection chamber 53. The direct injection burner cap 6 covers the upper gas chamber 52 and the direct injection chamber 53 respectively. This allows the top of the middle ring burner cap to form a dense ring of small flames even when the gas stove is not turned on for stir-frying. Secondly, when the top flame hole directly above the direct injection chamber 53 is blocked, the gas in the direct injection chamber 53 flows to the upper gas chamber 52, preventing the gas from flowing back into the gas stove from the direct injection ejector 14 after the central direct injection flame is blocked, thus preventing a hazard.

[0055] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A fire-distribution structure, characterized in that, Includes a fire distributor (2), said fire distributor (2) comprising: An upward-opening outer annular gas cavity (21) has a gas inlet (211) on its bottom surface. A first gradient surface (212) and a second gradient surface (213) are formed on the bottom surface of the outer annular gas cavity (21). The second gradient surface (213) is located radially inside the first gradient surface (212). Both the first gradient surface (212) and the second gradient surface (213) extend clockwise from the gas inlet (211) and gradually rise upward.

2. The fire distribution structure according to claim 1, characterized in that, The width of the first gradient surface (212) in the radial direction gradually increases from the gas inlet (211) in the clockwise direction, and the width of the second gradient surface (213) in the radial direction gradually decreases from the gas inlet (211) in the clockwise direction; and / or the second gradient surface (213) extends radially inward from the first gradient surface (212) and is arranged to be inclined or curved upward.

3. The fire distribution structure according to claim 2, characterized in that, The arc length of the first gradient surface (212) is greater than the arc length of the second gradient surface (213); the arc length of the second gradient surface (213) is greater than 1 / 2 of the circumference of the inner wall of the outer annular air cavity (21), and less than the circumference of the inner wall of the outer annular air cavity (21).

4. The fire distribution structure according to claim 1, characterized in that, An arc-shaped surface (214) is provided between the higher end of the first gradient surface (212) and the gas inlet (211). The arc-shaped surface (214) gradually rises from the gas inlet (211) towards the higher end of the first gradient surface (212) and upwards, and / or the arc-shaped surface (214) gradually rises from the outside to the inside and upwards in the radial direction.

5. The fire distribution structure according to claim 1, characterized in that, The fire distributor (2) further includes a middle ring air chamber (22) with openings at both the upper and lower ends and a direct jet chamber (23) with openings at both the upper and lower ends. The middle ring air chamber (22) is disposed between the outer ring air chamber (21) and the direct jet chamber (23), and a secondary air passage (24) is formed between the middle ring air chamber (22) and the outer ring air chamber (21).

6. The fire distribution structure according to claim 5, characterized in that, A plurality of external connecting ribs (241) are arranged at intervals along the circumferential direction between the outer surface of the inner cavity wall of the outer ring air chamber (21) and the outer surface of the outer cavity wall of the middle ring air chamber (22); a plurality of internal connecting ribs (221) are arranged at intervals along the circumferential direction between the outer surface of the side cavity wall of the direct jet chamber (23) and the inner surface of the outer cavity wall of the middle ring air chamber (22).

7. A fire distribution structure according to claim 6, characterized in that, A radial groove (242) is recessed at the bottom of the outer connecting rib (241) and is arranged in the radial direction and opens downward.

8. A fire distribution structure according to claim 5, characterized in that, An inwardly extending positioning block (222) is provided on the inner surface of the outer wall of the middle ring air cavity (22), and / or two outwardly extending protrusions (243) are provided on the outer surface of the outer wall of the middle ring air cavity (22), and a positioning notch (244) is formed between the two protrusions (243).

9. A fire distribution structure according to any one of claims 1-8, characterized in that, It also includes a baffle plate (3), which is detachably installed in the outer annular gas chamber (21) and located directly above the gas inlet (211). Multiple gas equalization holes (31) are provided on the baffle plate (3).

10. A burner, characterized in that, include: The burner head structure (1) is provided with an upward-opening outer mixing chamber (111), a middle mixing chamber (112) and a direct injection mixing chamber (113). The outer mixing chamber (111) is located outside the middle mixing chamber (112), and the direct injection mixing chamber (113) is located inside the middle mixing chamber (112). A flame distribution structure as described in any one of claims 1-9 is installed on the top of the burner head structure (1). The flame distribution structure is provided with an outer annular gas chamber (21), a middle annular gas chamber (22), and a direct injection chamber (23). The outer annular gas chamber (21) is connected to the outer mixing chamber (111) through a gas inlet (211). The middle annular gas chamber (22) is connected to the middle mixing chamber (112). The direct injection chamber (23) is connected to the direct injection mixing chamber (113). The flame cap structure includes an outer ring flame cap (4) and a middle ring flame cap. The outer ring flame cap (4) is placed on top of the outer ring gas chamber (21), and the middle ring flame cap is placed on top of the middle mixing chamber (112) and the direct injection mixing chamber (113), respectively.

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