Inner fire cover and combustor thereof

Abstract

The utility model discloses an inner fire cover which is provided with a central through hole and a gas mixing cavity with a downward opening, a plurality of fire holes are formed in the inner side wall of the inner fire cover, and the two opposite ends of each fire hole are communicated with the central through hole and the gas mixing cavity respectively. The outer side wall of the inner fire cover is provided with an inner groove which is sunken towards the interior of the inner fire cover and is provided with a downward opening, the inner groove side wall, close to the gas mixing cavity, of the inner groove is provided with a plurality of ignition holes, and the ignition holes are communicated with the inner groove and the gas mixing cavity respectively. The inner fire cover is simple in structure, the sealing face of the inner fire cover is concave inwards, the ignition needle assembly can be hidden conveniently, and the anti-overflow effect is achieved. The utility model further discloses a burner.

Description

Technical Field

[0001] The utility model relates to the technical field of stoves, in particular to an inner fire cover and a burner thereof. Background Art

[0002] At present, the head of the ignition needle sensor needle of the gas stoves on the market often has no cover on the top. When the soup overflows from the pot while the user is cooking, or the user accidentally soaks the bottom of the pot while washing the pot, the water will drip along the outer contour of the pot onto the ignition sensor needle, causing abnormal discharge during the next ignition.

[0003] Some gas stoves hide the ignition sensor needle under the inner fire cover or its brim to increase the anti-overflow function. However, there are the following limitations: when the inner ring fire cover is too close to the outer ring fire cover, there is no space to add a brim; for the liquid tray of the enameled process, there is a risk of porcelain explosion if the holes are punched too close. Summary of the invention

[0004] The utility model aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the utility model provides an inner fire cover with a simple structure. By making the sealing surface of the inner fire cover concave, the ignition needle assembly is conveniently hidden to achieve an anti-overflow effect. The utility model also provides a burner.

[0005] According to the above-mentioned inner fire cover, it is realized by the following technical solution:

[0006] An inner fire cover, the inner fire cover has a central through hole and a gas mixing chamber opening downward, a plurality of fire holes are arranged on the inner side wall of the inner fire cover, and the opposite ends of the fire holes are respectively connected with the central through hole and the gas mixing chamber; an inner groove which is recessed inwardly and opening downward is arranged on the outer side wall of the inner fire cover, and a plurality of ignition holes are arranged on the inner groove side wall close to the gas mixing chamber, and the ignition holes are respectively connected with the inner groove and the gas mixing chamber.

[0007] In some embodiments, the diameter of the inner groove gradually increases from the inside to the outside along the radial direction.

[0008] In some embodiments, a fire transmission part is provided on the top of the inner fire cover, the fire transmission part is connected to the fire hole arranged close thereto, and the radial outer end of the fire transmission part is connected to the inner groove, and the radial inner end is connected to or arranged close to the center through hole.

[0009] In some embodiments, the top of the inner fire cover is an arc-shaped surface that bends from the inside to the outside and downward, or the top of the inner fire cover is an inclined surface that slopes from the inside to the outside and downward.

[0010] In some embodiments, the central through hole includes a flared section whose diameter gradually increases from bottom to top, and the fire hole is arranged at the upper end of the flared section.

[0011] In some embodiments, the central through hole further includes a vertical section, wherein the vertical section is disposed below the flared section and communicates with the flared section.

[0012] In some embodiments, the inner fire cover includes a fire cover body and a flame stabilizing ring having a central through hole, the fire cover body is covered outside the flame stabilizing ring, the fire cover body and the flame stabilizing ring are combined to form the gas mixing chamber, a fire hole is formed on the flame stabilizing ring or between the flame stabilizing ring and the top plate of the fire cover body, and the inner groove and the ignition hole are provided on the side plate of the fire cover body.

[0013] In some embodiments, a downwardly extending limiting portion is fixedly provided at the bottom of the top plate of the fire cover body, and the limiting portion is located at the periphery of the upper end of the flame stabilizing ring and abuts against the flame stabilizing ring.

[0014] In some embodiments, opposite ends of the limiting portion are respectively connected to radial inner ends of the inner groove.

[0015] In some embodiments, a flange extending outward is fixedly provided on the upper end of the side wall of the flame stabilizing ring, and the flange is respectively abutted against the limiting portion and the inner groove side wall of the inner groove close to the gas mixing chamber.

[0016] In some embodiments, the inner fire cover includes a side panel, a top panel and a flame stabilizing ring having a central through hole, and a top panel extending outward is integrally formed at the upper periphery of the flame stabilizing ring, and the side panel is arranged at the periphery of the flame stabilizing ring and is located below the top panel, and the gas mixing chamber is formed by the side panel, the flame stabilizing ring and the top panel, a fire hole is provided on the flame stabilizing ring, and the inner groove and the ignition hole are provided on the side panel.

[0017] According to the burner provided above, it is realized by the following technical solution:

[0018] A burner comprises: a burner head, wherein the burner head is provided with an inner air cavity, an inner ring air cavity and an outer air cavity, wherein the inner ring air cavity is located between the inner air cavity and the outer air cavity; an inner fire cover as described above, wherein the inner fire cover is arranged on the top of the inner ring air cavity, the air mixing cavity is connected with the inner ring air cavity, and the central through hole is connected with the inner air cavity; and an ignition needle assembly, wherein at least a part of the ignition needle assembly is installed in the outer air cavity, and the head of the ignition needle assembly extends into the inner groove.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] 1. The inner fire cover of the utility model is provided with an inner groove which is concave inwardly on the outer side wall of the inner fire cover, and an ignition hole is provided on the sealing surface of the inner groove. The inner groove is connected with the gas mixing chamber of the inner fire cover through the ignition hole. The structure is simple, and the sealing surface of the inner fire cover is concave, which is convenient for hiding the ignition needle assembly, achieving an anti-overflow effect, and preventing boiling water from overflowing the pot or pot washing water from sliding down and wetting the needle to cause poor ignition;

[0021] 2. By designing the inner fire cover to include a split fire cover body and a flame stabilizing ring, the fire cover body and the flame stabilizing ring together enclose a downward-opening gas mixing chamber, the inner groove and the ignition hole are arranged on the fire cover body, and the fire hole is arranged on the flame stabilizing ring or between the fire cover body and the flame stabilizing ring, it is effectively avoided that the inner groove is cut through when processing the fire hole and the sealing surface of the inner fire cover is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the inner fire cover in Example 1 of the utility model. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of the inner fire cover in Example 1 of the utility model. Figure 2 ;

[0024] Figure 3 It is a cross-sectional view of the inner fire cover in Embodiment 1 of the present utility model;

[0025] Figure 4 It is an exploded view of the inner fire cover in Embodiment 1 of the present utility model;

[0026] Figure 5 It is a structural schematic diagram of the fire cover body in Embodiment 1 of the present utility model;

[0027] Figure 6 It is a schematic diagram of the structure of the burner in Example 3 of the utility model;

[0028] Figure 7 is a cross-sectional view of a burner in Embodiment 3 of the present utility model;

[0029] Figure 8 It is a top view of the burner head and ignition needle assembly in Example 3 of the utility model.

[0030] In the figure: 1-inner fire cover, 101-central through hole, 1011-expanding section, 1012-vertical section, 102-gas mixing chamber, 103-fire hole, 104-inner groove, 105-ignition hole, 106-fire transmission part, 107-limiting step, 11-fire cover body, 111-top plate, 112-side plate, 113-limiting part, 12-flame stabilizing ring, 121-flange;

[0031] 2-burner head, 21-inner air cavity, 211-transverse secondary air channel, 22-inner ring air cavity, 23-outer air cavity, 231-vertical secondary air channel, 232-partition, 24-outer ring air outlet cavity, 25-air vent, 26-support part; 3-ignition assembly; 4-outer fire cover assembly, 41-outer ring air chamber. DETAILED DESCRIPTION

[0032] The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific implementation of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed for protection in the present invention.

[0033] Example 1

[0034] refer to Figure 1-3 The present embodiment provides an inner fire cover, and the inner fire cover 1 is preferably a split fire cover, which includes a fire cover body 11 and a flame stabilizing ring 12 with a central through hole 101. In the present embodiment, the fire cover body 11 includes a top plate 111 and a side plate 112 connected in a "T" shape. During installation, the fire cover body 11 is covered outside the flame stabilizing ring 12, and the top plate 111 of the fire cover body 11 is abutted against or sealed against the top of the flame stabilizing ring 12. The fire cover body 11 and the flame stabilizing ring 12 together enclose a mixing chamber 102 opening downward, and the mixing chamber 102 is located outside the central through hole 101. At this time, the flame stabilizing ring 12 constitutes the inner side wall of the inner fire cover 1 (that is, the inner annular wall of the mixing chamber 102), the side plate 112 of the fire cover body 11 constitutes the outer side wall of the inner fire cover 1 (that is, the outer annular wall of the mixing chamber 102), the top plate 111 of the fire cover body 11 constitutes the top of the inner fire cover 1, and the top plate 111 of the fire cover body 11 partially constitutes the top cavity wall of the mixing chamber 102.

[0035] A plurality of fire holes 103 arranged at intervals in the circumferential direction are provided on the inner side wall of the inner fire cover 1, that is, a plurality of fire holes 103 arranged at intervals in the circumferential direction are formed on the flame stabilizing ring 12 or between the flame stabilizing ring 12 and the top plate 111 of the fire cover body 11, and the opposite ends of the fire holes 103 are respectively connected to the central through hole 101 and the gas mixing chamber 102. Further, the fire holes 103 can be circular fire holes, or fire grooves or cut grooves. In this embodiment, the fire holes 103 are taken as fire grooves as an example. The fire grooves are arranged on the flame stabilizing ring 12 along the radial direction and tilted toward the circumferential direction. The upper end of the fire grooves can cut through or not switch the top of the flame stabilizing ring 12. When the upper end of the fire grooves cuts through the top of the flame stabilizing ring 12, the top plate 111 of the fire cover body 11 covers the opening of the upper end of the fire grooves. Since the fire grooves are arranged along the radial direction and tilted toward the circumferential direction, the fire grooves constitute swirl fire holes. When the gas flows through the fire grooves (i.e., swirl fire holes) and ignites at the fire grooves, swirl fire is formed.

[0036] An inner groove 104 which is recessed inwardly and open downwardly is provided on the outer side wall of the inner fire cover 1, that is, an inner groove 104 which is recessed inwardly and open downwardly is provided on the side plate 112 of the fire cover body 11, and a plurality of ignition holes 105 are provided on the inner groove side wall of the inner groove 104 close to the mixing chamber 102, and the ignition holes 105 are respectively connected with the inner groove 104 and the mixing chamber 102.

[0037] It can be seen that by providing an inner groove 104 that is recessed toward the inside and opens downward on the outer side wall of the inner fire cover 1 (i.e., the side plate 112 of the fire cover body 11), the sealing surface of the inner fire cover is concave, which is convenient for hiding the ignition needle assembly, achieving an anti-overflow effect, and preventing boiling water from overflowing the pot or pot washing water from sliding down and wetting the needle, resulting in poor ignition. In addition, by providing the fire hole 103 on the inner side wall of the inner fire cover 1, that is, providing the fire hole 103 on the flame stabilizing ring 12 or between the fire cover body 11 and the flame stabilizing ring 12, it is effectively avoided that the inner groove 104 is cut through when processing the fire hole to damage the sealing surface of the inner fire cover, thereby avoiding fire leakage of the burner.

[0038] refer to Figure 1-5 Furthermore, the diameter of the inner groove 104 gradually increases from the inside to the outside in the radial direction, so that the inner groove 104 has a flared structure, which makes it easier for the head of the ignition needle assembly to extend into the inner groove 104 and guide the airflow flowing out of the ignition hole 105.

[0039] refer to Figure 1-4 Furthermore, a fire transmission part 106 is provided on the top of the inner fire cover 1, that is, a fire transmission part 106 arranged in the radial direction is provided on the top plate 111 of the fire cover body 11, and the fire transmission part 106 is connected to the fire hole 103 arranged near it, and the radial outer end of the fire transmission part 106 is connected to the inner groove 104, and the radial inner end is connected to the central through hole 101 or arranged close to it, so that through the fire transmission part 106, it is convenient to conduct the flame ignited by the ignition needle assembly at the inner groove 104 inwardly in the radial direction to the fire hole 103 at the inner side wall of the inner fire cover 1, thereby igniting the gas ejected from the fire hole 103 to the central through hole 101, forming an inner ring fire. In this embodiment, the fire transmission part 106 is a fire transmission groove arranged in the radial direction. Of course, the fire transmission part 106 can also be designed to be composed of a plurality of fire transmission holes arranged at intervals in the radial direction.

[0040] Furthermore, the top of the inner fire cover 1 is an arcuate surface that bends from the inside to the outside and downward, or the top of the inner fire cover is an inclined surface that tilts from the inside to the outside and downward. In this way, the top plate 111 of the fire cover body 11 is an arcuate surface or an inclined surface, which is not only convenient for guiding the flame to the radial inside of the inner fire cover 1, but also convenient for guiding the water dripping to the top of the inner fire cover 1 (the top plate 111 of the fire cover body 11) to the radial outside of the inner fire cover 1.

[0041] refer to Figure 2-3Furthermore, a limiting step 107 is provided on the hole wall of the central through hole 101, and the limiting step 107 is used to provide limiting and sealing when the inner fire cover 1 is installed on the burner head. In this embodiment, the central through hole 101 includes a flaring section 1011 whose diameter gradually increases from bottom to top, and the fire hole 103 is arranged at the upper end of the flaring section 1011. In this way, through the flaring section 1011, it is convenient to guide the inner ring fire ignited from the fire hole 103 to spread upward and outward, which is conducive to increasing the range of the inner ring fire power. In addition, when the fire hole 103 constitutes a rotating fire hole, the rotating fire effect can be effectively improved by cooperating with the rotating fire hole and the flaring section 1011.

[0042] The central through hole 101 further includes a vertical section 1012 , which is disposed below the flared section 1011 and communicates with the flared section 1011 . The limiting step 107 can be disposed on the vertical section 1012 or between the vertical section 1012 and the flared section 1011 .

[0043] refer to Figure 3-5 Furthermore, a downwardly extending stopper 113 is integrally formed at the bottom of the top plate 111 of the fire cover body 11. The stopper 113 is located at the outer periphery of the upper end of the flame stabilizing ring 12 and abuts against the flame stabilizing ring 12. In this way, the stopper 113 can provide stopper and positioning for the flame stabilizing ring 12. In this embodiment, the opposite ends of the stopper 113 are integrally formed with the radial inner ends of the inner groove 104, respectively. In addition, an outwardly extending flange 121 is integrally formed at the upper peripheral edge of the side wall of the flame stabilizing ring 12, and the flange 121 abuts against the stopper 113 and the inner groove side wall of the inner groove 104 close to the gas mixing chamber 102, respectively.

[0044] Example 2

[0045] The difference between this embodiment and the first embodiment is that the inner fire cover 1 is formed in a different manner. In this embodiment, the inner fire cover 1 includes a side plate 112, a top plate 111 and a flame stabilizing ring 12 having a central through hole 101, and the side plate 112 is designed as a separate part from the top plate 111 and the flame stabilizing ring 12. The top plate 111 extending outward is integrally formed at the upper end periphery of the flame stabilizing ring 12, that is, the top plate 111 and the flame stabilizing ring 12 are designed as an integrated whole, and the two are enclosed to form a "T" shape or an umbrella shape.

[0046] During installation, the side plate 112 is arranged outside the flame stabilizing ring 12 and below the top plate 111. The top of the side plate 112 is abutted against or sealed against the bottom of the top plate 111. At this time, the gas mixing chamber 102 is formed by the side plate 112, the flame stabilizing ring 12 and the top plate 111. A fire hole 103 is provided on the flame stabilizing ring 12, and a fire transmission part 106 is provided on the top plate 111 of the flame stabilizing ring 12; an inner groove 104 and an ignition hole 105 are provided on the side plate 112. At this time, the upper end of the inner groove 104 can be closed or opened. When the upper end of the inner groove 104 is opened to form a top opening, the top plate 111 of the flame stabilizing ring 12 is configured to cover the top opening of the inner groove 104.

[0047] It can be seen that by integrating the top plate 111 on the flame stabilizing ring 12 and designing the side plate 112 separately from the top plate 111 and the flame stabilizing ring 12, the sealing surface of the inner fire cover 1 is concave, which is convenient for hiding the needle of the ignition needle assembly and achieving an anti-overflow effect. Secondly, it can avoid cutting through the inner groove when processing the fire hole and damaging the sealing surface of the inner fire cover. In addition, in order to facilitate the installation of the top plate 111 on the top plate 112 of the flame stabilizing ring 12, a mounting portion can be provided at the position of the bottom of the top plate 112 corresponding to the side plate 111, and the upper end of the top plate 111 is abutted or sealed against the mounting portion at the bottom of the side plate 111.

[0048] Example 3

[0049] refer to Figure 6-8 This embodiment provides a burner, comprising a burner head 2, an inner fire cover as described in Embodiment 1 or 2, an ignition needle assembly 3 and an outer fire cover assembly 4. The burner head 2 is provided with an inner air cavity 21, an inner ring air cavity 22, an outer air cavity 23 and at least one outer ring air outlet cavity 24, the inner ring air cavity 22 is located between the inner air cavity 21 and the outer air cavity 23, and at least one outer ring air outlet cavity 24 is arranged outside the outer air cavity 23.

[0050] The inner fire cover 1 is covered on the top of the inner ring air cavity 22, the mixing cavity 102 is connected to the inner ring air cavity 22, and the central through hole 101 is connected to the inner air cavity 21. The outer fire cover assembly 4 is covered on the top of at least one outer ring air outlet cavity 24, and the outer ring air chamber 41 of the outer fire cover assembly 4 is connected to at least one outer ring air outlet cavity 24. At least part of the ignition needle assembly 3 is installed in the outer air cavity 23, and the head of the ignition needle assembly 3 extends into the inner groove 104, so that the head of the ignition needle assembly 3 is shielded by the inner groove 104 of the inner fire cover 1, so as to achieve the anti-overflow function, prevent boiling water from overflowing the pot or pot washing water from sliding down and wetting the needle head, resulting in poor ignition.

[0051] Furthermore, a transverse secondary air channel 211 is provided on the side wall of the inner air cavity 21 and runs transversely through the inner ring air cavity 22. The inner air cavity 21 is connected with the outer air cavity 23 through the transverse secondary air channel 211. Of course, an air replenishment inlet for secondary air to pass through can also be provided at the bottom of the inner air cavity 21. The inner air cavity 21 is connected with the atmosphere at the bottom of the burner head 1 through the air replenishment inlet. In this way, secondary air can be replenished to the inner air cavity 21 through the transverse secondary air channel 211 or the air replenishment inlet, so that the inner ring fire can burn more fully.

[0052] A plurality of vertical secondary air channels 231 are provided at intervals at the bottom of the outer air cavity 23. The outer air cavity 23 is connected to the atmosphere at the bottom of the burner head 1 through the vertical secondary air channels 231 to replenish the secondary air from the bottom to the top. A partition 232 is formed between adjacent vertical secondary air channels 231, one of which is arranged corresponding to the inner groove 104 of the inner fire cover 1, and the ignition needle assembly 4 is mounted on the partition.

[0053] In this embodiment, the number of the outer ring air outlet cavities 24 is two, and of course, it can also be one or more than two. Each outer ring air outlet cavity 24 is connected to the outer ring air chamber of the outer fire cover assembly 4. A vent 25 is formed between adjacent outer ring air outlet cavities 24, which is located below the outer fire cover assembly 4 and is used for secondary air to pass through. The outer air cavity 23 is connected to the atmosphere outside the side wall of the burner head 1 through the vent 25 to achieve the secondary air replenishment from the side to the inside. In addition, an upwardly extending support portion 26 is integrally formed on the burner head 1, and the upper end of the support portion 26 is abutted or matched with the bottom of the outer fire cover assembly 4, which is used to provide support and positioning for the outer fire cover assembly 4, so that the outer fire cover assembly 4 can be more firmly and reliably installed on the burner head 1.

[0054] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An inner fire cover, characterized in that: The inner fire cover has a central through hole (101) and a gas mixing chamber (102) opening downward, and a plurality of fire holes (103) are provided on the inner side wall of the inner fire cover, and opposite ends of the fire holes (103) are respectively connected to the central through hole (101) and the gas mixing chamber (102); An inner groove (104) which is recessed inward and open downward is provided on the outer side wall of the inner fire cover, and a plurality of ignition holes (105) are provided on the inner groove side wall of the inner groove (104) close to the gas mixing chamber (102). The ignition holes (105) are respectively connected to the inner groove (104) and the gas mixing chamber (102).

2. An inner fire cover according to claim 1, characterized in that: The diameter of the inner groove (104) gradually increases from the inside to the outside along the radial direction.

3. An inner fire cover according to claim 1, characterized in that: A fire transmission part (106) is provided on the top of the inner fire cover, and the fire transmission part (106) is connected to the fire hole (103) arranged close thereto, and the radial outer end of the fire transmission part (106) is connected to the inner groove (104), and the radial inner end is connected to or arranged close to the central through hole (101).

4. The inner fire cover according to claim 1, characterized in that: The top of the inner fire cover is an arc-shaped surface that bends from the inside to the outside and downward, or the top of the inner fire cover is an inclined surface that slopes from the inside to the outside and downward.

5. The inner fire cover according to claim 1, characterized in that: The central through hole (101) comprises a flared section (1011) whose diameter gradually increases from bottom to top, and the fire hole (103) is arranged at the upper end of the flared section (1011).

6. An inner fire cover according to claim 5, characterized in that: The central through hole (101) further comprises a vertical section (1012), wherein the vertical section (1012) is arranged below the flared section (1011) and is in communication with the flared section (1011).

7. An inner fire cover according to any one of claims 1 to 6, characterized in that: The inner fire cover comprises a fire cover body (11) and a flame stabilizing ring (12) having a central through hole (101); the fire cover body (11) is covered outside the flame stabilizing ring (12); the fire cover body (11) and the flame stabilizing ring (12) are combined to form the gas mixing chamber (102); a fire hole (103) is formed on the flame stabilizing ring (12) or between the flame stabilizing ring (12) and the top plate (111) of the fire cover body (11); and the inner groove (104) and the ignition hole (105) are provided on the side plate (112) of the fire cover body (11).

8. An inner fire cover according to claim 7, characterized in that: A limiting portion (113) extending downward is fixedly provided at the bottom of the top plate (111) of the fire cover body (11); the limiting portion (113) is located at the periphery of the upper end of the flame stabilizing ring (12) and abuts against the flame stabilizing ring (12).

9. An inner fire cover according to claim 8, characterized in that: The opposite ends of the limiting portion (113) are respectively connected to the radial inner ends of the inner groove (104).

10. The inner fire cover according to claim 8, characterized in that: A flange (121) extending outward is fixedly provided at the upper end of the side wall of the flame stabilizing ring (12), and the flange (121) is respectively in contact with the limiting portion (113) and the inner groove side wall of the inner groove (104) close to the gas mixing chamber (102).

11. An inner fire cover according to any one of claims 1 to 6, characterized in that: The inner fire cover comprises a side plate (112), a top plate (111) and a flame stabilizing ring (12) having a central through hole (101); a top plate (111) extending outward is integrally formed on the upper periphery of the flame stabilizing ring (12); the side plate (112) is arranged at the periphery of the flame stabilizing ring (12) and is located below the top plate (111); the gas mixing chamber (102) is formed by the side plate (112), the flame stabilizing ring (12) and the top plate (111); a fire hole (103) is provided on the flame stabilizing ring (12); and the inner groove (104) and the ignition hole (105) are provided on the side plate (112).

12. A burner, characterized in that: include: A furnace head (2), the furnace head (2) being provided with an inner air cavity (21), an inner ring air cavity (22) and an outer air cavity (23), the inner ring air cavity (22) being located between the inner air cavity (21) and the outer air cavity (23); An inner fire cover according to any one of claims 1 to 11, wherein the inner fire cover is arranged on the top of the inner ring air cavity (22), the gas mixing cavity (102) is connected to the inner ring air cavity (22), and the central through hole (101) is connected to the inner air cavity (21); and An ignition needle assembly (3), at least a portion of which is installed in the outer air cavity (23), and a head of the ignition needle assembly (3) extends into the inner groove (104).

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