Furnace end structure and burner thereof

Abstract

The furnace end structure comprises a furnace end body, the furnace end body is provided with an outer gas mixing cavity, a middle gas mixing cavity, a direct injection gas mixing cavity and a gas receiving channel, the outer gas mixing cavity and the middle gas mixing cavity are arranged side by side at intervals, the direct injection gas mixing cavity is arranged in the middle gas mixing cavity, and the gas receiving channel is communicated with the outer gas mixing cavity. One end of the gas receiving channel extends outwards to the outside of the outer side wall of the furnace end body, and the other end of the gas receiving channel extends inwards into the middle gas mixing cavity and communicates with the direct injection gas mixing cavity; the injection assembly is detachably installed on the furnace end body and comprises an outer injection pipe and a middle injection pipe which are arranged side by side in a spaced mode, the outer injection pipe communicates with the outer gas mixing cavity, and the middle injection pipe communicates with the middle gas mixing cavity; and the direct injection ejector is detachably mounted on the gas receiving channel. According to the furnace end structure, the primary air coefficient of outer ring fire can be increased, and the dominance and the stability of direct spraying fire can be improved.

Description

Technical Field

[0001] This utility model relates to the field of gas stove technology, and in particular to a burner 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, existing burners typically have a turning flow channel on the outer ring mixing chamber, which will generate resistance loss, affect the primary air coefficient of the outer ring fire, and reduce the mixing effect of the outer ring gas and air. 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 burner structure that can both improve the primary air coefficient of the outer ring fire and enhance the visibility and stability of the direct injection fire. This invention also provides a burner.

[0005] The burner head structure provided above is achieved through the following technical solution:

[0006] A burner head structure includes: a burner head body having an upward-opening outer mixing chamber, a middle mixing chamber, a direct injection mixing chamber, and a gas receiving channel; the outer mixing chamber and the middle mixing chamber are arranged side-by-side with spacing between them; the direct injection mixing chamber is disposed within the middle mixing chamber; one end of the gas receiving channel extends outward to the outer side wall of the burner head body, and the other end extends inward into the middle mixing chamber and communicates with the direct injection mixing chamber; an ejector assembly detachably mounted on the burner head body, and including an outer ejector tube and a middle ejector tube arranged side-by-side with spacing between them; the outer ejector tube communicating with the outer mixing chamber, and the middle ejector tube communicating with the middle mixing chamber; and a direct injection ejector detachably mounted on the gas inlet end of the gas receiving channel.

[0007] In some embodiments, one end of the direct injection ejector is sealed to the air inlet end of the air inlet channel, and the other end is provided with at least one air hole for primary air to pass through.

[0008] In some embodiments, the direct injection ejector has an outwardly extending head protruding from one end away from the furnace head body, and / or at least one annular groove is recessed in the middle of the outer side wall of the direct injection ejector.

[0009] In some embodiments, the bottom of the direct injection mixing chamber and the air receiving channel are both higher than the bottom surface of the intermediate mixing chamber.

[0010] In some embodiments, a downward-opening air-proof hole is provided at the bottom of the direct injection mixing chamber.

[0011] In some embodiments, an outer head mixing chamber and a middle head mixing chamber are provided at the lower end of the burner body, opening toward the ejector assembly. The outer head mixing chamber is located at the bottom of the outer mixing chamber, and the outer ejector tube is connected to the outer mixing chamber through the outer head mixing chamber. The middle head mixing chamber is located at the bottom of the middle mixing chamber, and the middle ejector tube is connected to the middle mixing chamber through the middle head mixing chamber.

[0012] In some embodiments, a vertical connecting portion is provided between the outer head mixing chamber and the middle head mixing chamber, and a horizontal connecting portion is provided between the upper end of the outer mixing chamber and the upper end of the middle mixing chamber.

[0013] In some embodiments, an outwardly extending lug is provided on the upper end of the outer side wall of the outer air mixing chamber and the upper end of the outer side wall of the middle air mixing chamber; an outwardly extending mounting boss is provided on the upper end of the outer side wall of the middle air mixing chamber, or an mounting boss extending toward the middle air mixing chamber is provided on the upper end of the outer side wall of the outer air mixing chamber.

[0014] The burner provided above is achieved through the following technical solution:

[0015] A burner includes: a burner head structure as described above; and a flame cap structure, the flame cap structure including an outer ring flame cap and a middle ring flame cap, the outer ring flame cap covering the top of the outer mixing chamber, and the middle ring flame cap covering the top of the middle mixing chamber and the top of the direct injection mixing chamber respectively.

[0016] In some embodiments, a flame distributor is also included, which is disposed between the burner head structure and the flame cap structure. The flame distributor has an outer ring gas chamber, a middle ring gas chamber, and a direct injection chamber. The middle ring gas chamber is located between the outer ring gas chamber and the direct injection chamber. A gas inlet is provided at the bottom of the outer ring gas chamber corresponding to the position of the outer mixing chamber. The outer ring gas chamber is connected to the outer mixing chamber through the gas inlet. The middle ring gas chamber is connected to the middle mixing chamber. The direct injection chamber is connected to the direct injection mixing chamber. The outer ring flame cap is disposed on the top of the outer ring gas chamber, and the middle ring flame cap is disposed on the top of the middle ring gas chamber and the top of the direct injection chamber, respectively.

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

[0018] 1. The burner head structure of this utility model, by setting the outer mixing chamber outside the middle mixing chamber and arranging them parallel and spaced apart, and connecting the outer ejector pipe to the outer mixing chamber, allows the mixture of outer ring combustion gas and air to flow directly upward along the outer mixing chamber after flowing out from the outer ejector pipe. Compared with the existing annular outer mixing chamber of the burner head, there is no resistance loss caused by the turning flow channel, which is beneficial to the primary air coefficient of the outer ring fire and improves the mixing effect of outer ring combustion gas and air.

[0019] 2. By setting the direct injection mixing chamber inside the intermediate mixing chamber, and connecting the intermediate mixing chamber to the intermediate ejector tube, and connecting the direct injection mixing chamber to the direct injection ejector through the air inlet channel, the primary air injection of the intermediate ring fire and the direct injection fire is made independent of each other, which is beneficial to improving the visibility and stability of the direct injection fire. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the burner head structure in an embodiment of this utility model;

[0021] Figure 2 This is an exploded view of the furnace head structure in an embodiment of this utility model;

[0022] Figure 3 This is a cross-sectional view of the burner head structure in an embodiment of this utility model. Figure 1 ;

[0023] Figure 4 This is a cross-sectional view of the burner head structure in an embodiment of this utility model. Figure 2 ;

[0024] Figure 5 This is a schematic diagram of the structure of the gas stove in an embodiment of this utility model;

[0025] Figure 6 This is an exploded view of the burner in an embodiment of this utility model;

[0026] Figure 7 This is a cross-sectional view of the burner in an embodiment of the present invention. Figure 1 ;

[0027] Figure 8 This is a cross-sectional view of the burner in an embodiment of the present invention. Figure 2 .

[0028] In the diagram: 1-furnace head structure, 11-furnace head body, 111-outer mixing chamber, 1112-outer head mixing chamber, 112-middle mixing chamber, 1121-middle head mixing chamber, 113-direct injection mixing chamber, 1131-gas inlet channel, 1132-avoiding hole, 1141-vertical connection part, 1142-lateral connection part, 115-lug, 116-mounting boss, 12-outer ejector tube, 13-middle ejector tube, 14-direct injection ejector, 141-air hole, 142-head, 143-annular groove;

[0029] 2-Distributor, 21-Outer ring gas chamber, 211-Gas inlet, 22-Middle ring gas chamber, 23-Direct jet chamber, 24-Secondary air passage; 3-Baffle plate, 31-Gas equalization hole;

[0030] 4-Outer ring flame cap, 41-Outer ring gas chamber, 411-Outer ring flame hole; 5-Flame cap body, 51-Middle ring gas chamber, 511-Upper large flame hole, 512-Upper small flame hole, 513-Lower large flame hole, 514-Ignition hole, 52-Upper gas chamber, 521-Direct injection flame hole, 53-Direct injection chamber, 531-Pressure relief hole, 541-Liquid storage tank, 542-Guide channel, 55-Cap brim; 6-Direct injection flame cap, 61-Top flame hole;

[0031] 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;

[0032] 8-Ignition assembly. Detailed Implementation

[0033] 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.

[0034] Example 1

[0035] refer to Figure 1-4 This embodiment provides a burner structure 1, which includes a burner body 11, an ejector assembly, and a direct injection ejector 14. The burner body 11 is provided with 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, the burner 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 fire and improves the mixing effect of the outer ring gas and air.

[0036] 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.

[0037] refer to Figure 1-4 Specifically, the direct injection ejector 14 is arranged at a certain angle to the center of the burner head body 11, and the direct injection ejector 14 is arranged higher than the ejector assembly. One end of the direct injection ejector 14 is sealed to the air inlet end of the gas inlet channel 1131, and the other end is provided with at least one air hole 141 for primary air to pass through. In this embodiment, there are two air holes 141, but there can also be three or four. A head 142 protrudes outwardly at the end of the direct injection ejector 14 away from the burner head body 11, and / or at least one annular groove 143 is recessed in the middle of the outer side wall of the direct injection ejector 14. The annular groove 143 is designed between the air hole 141 and the gas inlet channel 1131.

[0038] refer to Figure 2-4 Specifically, the bottom of the direct injection mixing chamber 113 and the gas inlet channel 1131 are both higher than the bottom surface of the intermediate mixing chamber 112. An airflow channel exists between the bottom of the direct injection mixing chamber 113 and the bottom surface of the intermediate mixing chamber 112, and this airflow channel is connected to the intermediate ejector tube 13. This avoids the direct injection mixing chamber 113 affecting the air intake of the intermediate mixing chamber 112. In this embodiment, a downward-opening clearance hole 1132 is recessed at the bottom of the direct injection mixing chamber 113. The clearance hole 1132 is an arc-shaped hole with a higher center and lower ends, facilitating rapid demolding during the manufacturing of the furnace head body 11, allowing the central ring mixed gas to pass through the bottom of the direct injection mixing chamber 113 and quickly fill the entire intermediate mixing chamber 112.

[0039] The lower end of the burner head body 11 is provided with an outer head mixing chamber 1112 and a middle head mixing chamber 1121 that open towards the ejector assembly. The outer head mixing chamber 1112 is located at the bottom of the outer mixing chamber 111, and the gas outlet end of the outer ejector tube 12 is inserted into the outer head mixing chamber 1112, and the outer ejector tube 12 is connected to the outer mixing chamber 111 through the outer head mixing chamber 1112. The middle head mixing chamber 1121 is located at the bottom of the middle mixing chamber 112, and the gas outlet end of the middle ejector tube 13 is inserted into the middle head mixing chamber 1121, and the middle ejector tube 13 is connected to the middle mixing chamber 112 through the middle head mixing chamber 1121.

[0040] refer to Figure 1-2 A vertical connecting portion 1141 is provided between the outer mixing chamber 1112 and the middle mixing chamber 1121. The vertical connecting portion 1141 is used to strengthen the burner body 11 and also to detachably connect the ejector assembly. A horizontal connecting portion 1142 is provided between the upper end of the outer mixing chamber 111 and the upper end of the middle mixing chamber 112. The horizontal connecting portion 1142 is used to strengthen the burner body 11 and also to reliably support the liquid collection tray of the gas stove. Thus, through the cooperation of the vertical connecting portion 1141 and the horizontal connecting portion 1142, the outer mixing chamber 111 and the middle mixing chamber 112 are firmly and reliably connected as one unit.

[0041] Both the outer wall of the outer mixing chamber 111 and the outer wall of the middle mixing chamber 112 have outwardly extending lugs 115, which are used for detachably connecting the liquid collection tray or panel of the gas stove. The outer wall of the middle mixing chamber 112 has an outwardly extending mounting boss 116, which is used to fix the ignition assembly 8. Alternatively, the outer wall of the outer mixing chamber 111 can have a mounting boss 116 extending towards the middle ring gas chamber 22.

[0042] Example 2

[0043] refer to Figure 5-8 This embodiment of a burner includes a flame cap structure and a burner head structure as described in Embodiment 1. The flame cap structure includes an outer ring flame cap 4 and a middle ring flame cap. The outer ring flame cap 4 is disposed on the top of the outer mixing chamber 111, and the middle ring flame cap is disposed on the top of the middle mixing chamber 112 and the top of the direct injection mixing chamber 113, respectively.

[0044] 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 of the burner head structure 1, and the outer mixing chamber 111, and finally flows out from the outer burner cap 4 and is ignited, forming an outer ring flame. See [link to documentation]. Figure 5 and Figure 7When 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 of the burner head structure 1, and the central mixing chamber 112, and finally flows out from the central ring burner cap and is ignited to form a central ring flame. See [link to relevant documentation]. Figure 5 and Figure 7 The other part passes sequentially through the stir-fry gas duct 723, the stir-fry gas pipe 753, the direct injection ejector 14 of the burner structure 1, and the direct injection mixing chamber 113, finally flowing upward from the central ring burner cap and being ignited, forming a direct injection flame, i.e., a stir-fry flame. See [link to relevant documentation]. Figure 5 and Figure 8 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.

[0045] It is evident that when the gas stove activates the one-touch high-heat flame, 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 flame. Furthermore, since the outer mixing chamber 111 on the burner head structure 1 does not suffer from resistance losses due to bends in the flow path, it improves the uniformity of the mixing of gas and air in the outer ring. The separate design of a direct injection ejector 14 on the burner head structure 1 further enhances the stability of the direct injection flame.

[0046] refer to Figure 5-8 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 mixing chamber 111 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 mixing chamber 112 through the middle annular gas chamber 51. The lower end of the direct injection chamber 53 is connected to the direct injection mixing chamber 113. 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.

[0047] 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.

[0048] Example 3

[0049] refer to Figure 5-8 The difference between this embodiment and Embodiment 2 is that the burner also includes a flame distributor 3, which is located between the burner head structure 1 and the burner cap structure. The flame distributor 2 has an outer ring gas chamber 21, a middle ring gas chamber 22, and a direct injection chamber 23 arranged coaxially. The middle ring gas chamber 22 is located between the outer ring gas chamber 21 and the direct injection chamber 23. A gas inlet 211 is provided at the bottom of the outer ring gas chamber 21 at the position corresponding to the outer mixing chamber 111. The outer ring gas chamber 21 is connected to the outer mixing chamber 111 through the gas inlet 211. The middle ring 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 outer ring burner 4 has its outer ring chamber 41 connected to the upper end of the outer ring chamber 21. The middle ring burner 4 is connected to both the middle ring chamber 22 and the direct jet chamber 23. Specifically, the middle ring chamber 51 of the middle ring burner is connected to the upper end of the middle ring chamber 22, and the direct jet chamber 52 of the middle ring burner is connected to the upper end of the direct jet chamber 23. Furthermore, the burner 2 is also equipped with a secondary air passage 24, which is located between the middle ring chamber 22 and the outer ring chamber 21 to provide secondary air for combustion in the middle ring burner.

[0050] refer to Figure 6-7 Furthermore, the gas stove also includes a baffle plate 3, which is located above the gas inlet 211 and connected to the burner 2 or the outer ring burner cap 4. Multiple gas equalization holes 31 are provided on the baffle plate 3 to improve the uneven flame phenomenon caused by the local excessive flow velocity of the outer ring gas when it is sprayed out from the side of the burner.

[0051] 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 stove head structure, characterized in that, include: The burner body (11) is provided with an upward-opening outer mixing chamber (111), a middle mixing chamber (112), a direct injection mixing chamber (113), and a gas receiving channel (1131). The outer mixing chamber (111) and the middle mixing chamber (112) are arranged side by side at intervals. The direct injection mixing chamber (113) is located in the middle mixing chamber (112). One end of the gas receiving channel (1131) extends outward to the outer side wall of the burner body (11), and the other end extends inward into the middle mixing chamber (112) and communicates with the direct injection mixing chamber (113). An ejector assembly, detachably mounted on the burner head body (11), includes an outer ejector tube (12) and a middle ejector tube (13) arranged side-by-side at intervals. The outer ejector tube (12) is connected to the outer mixing chamber (111), and the middle ejector tube (13) is connected to the middle mixing chamber (112). The direct injection ejector (14) is detachably installed on the air inlet end of the air inlet channel (1131).

2. The burner head structure according to claim 1, characterized in that, One end of the direct injection ejector (14) is sealed to the air inlet end of the air inlet channel (1131), and the other end is provided with at least one air hole (141) for primary air to pass through.

3. A burner head structure according to claim 1 or 2, characterized in that, The direct injection ejector (14) has an outwardly extending head (142) protruding at one end away from the furnace head body (11), and / or at least one annular groove (143) is recessed in the middle of the outer side wall of the direct injection ejector (14).

4. The burner head structure according to claim 1, characterized in that, The bottom of the direct injection mixing chamber (113) and the air receiving channel (1131) are both higher than the bottom surface of the intermediate mixing chamber (112).

5. A burner head structure according to claim 4, characterized in that, A downward-opening air-proof hole (1132) is provided at the bottom of the direct injection mixing chamber (113).

6. A burner head structure according to claim 1 or 4, characterized in that, The lower end of the burner body (11) is provided with an outer head mixing chamber (1112) and a middle head mixing chamber (1121) that open toward the ejector assembly. The outer head mixing chamber (1112) is located at the bottom of the outer mixing chamber (111), and the outer ejector tube (12) is connected to the outer mixing chamber (111) through the outer head mixing chamber (1112). The middle head mixing chamber (1121) is located at the bottom of the middle mixing chamber (112), and the middle ejector tube (13) is connected to the middle mixing chamber (112) through the middle head mixing chamber (1121).

7. A burner head structure according to claim 6, characterized in that, A vertical connecting part (1141) is provided between the outer head mixing chamber (1112) and the middle head mixing chamber (1121), and a horizontal connecting part (1142) is provided between the upper end of the outer mixing chamber (111) and the upper end of the middle mixing chamber (112).

8. A burner head structure according to claim 1, characterized in that, The flame divider (2) is provided with a middle ring gas chamber (22), and an outwardly extending lug (115) is provided on the upper end of the outer side wall of the outer mixing chamber (111) and the upper end of the outer side wall of the middle mixing chamber (112); an outwardly extending mounting boss (116) is provided on the upper end of the outer side wall of the middle mixing chamber (112), or an outwardly extending mounting boss (116) is provided on the upper end of the outer side wall of the outer mixing chamber (111) in the direction of the middle ring gas chamber (22).

9. A burner, characterized in that, include: A furnace head structure as described in any one of claims 1-8; as well as 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 mixing chamber (111), and the middle ring flame cap is placed on top of the middle mixing chamber (112) and the direct injection mixing chamber (113), respectively.

10. A burner according to claim 9, characterized in that, It also includes a flame divider (2), which is disposed between the burner head structure and the burner cap structure. The flame divider (2) is provided with an outer ring gas chamber (21), a middle ring gas chamber (22) and a direct injection chamber (23). The middle ring gas chamber (22) is located between the outer ring gas chamber (21) and the direct injection chamber (23). A gas inlet (211) is provided at the bottom of the outer ring gas chamber (21) corresponding to the position of the outer mixing chamber (111). The outer ring gas chamber (21) is connected to the outer mixing chamber (111) through the gas inlet (211). The middle ring 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 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 ring gas chamber (22) and the direct jet chamber (23), respectively.

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