阅读说明：本技术 燃烧器火盖及应用该火盖的燃气灶具 (Burner fire cover and gas cooker using same ) 是由 吴丽波 于 2019-09-17 设计创作，主要内容包括：本发明涉及一种燃烧器火盖及应用该火盖的燃烧器灶具,其中火盖包括有呈环形的火盖本体,所述火盖本体底部具有混气腔,在火盖本体的顶部开设有沿其径向贯穿的传火槽,传火槽与混气腔相流体连通,其特征在于：所述传火槽内设有分隔件,该分隔件沿传火槽长度方向延伸并将传火槽内分隔成两个区域,分隔件上设有通孔,且所述传火槽内的两个区域通过分隔件上的所述通孔相流体连通。本发明通过设置分隔件,将传火槽内分成两个区域,且两个区域之间还通过通孔相连通,如此两个区域既互为一体又互相独立,能够彼此稳焰,以使得传火稳定、可靠。(The invention relates to a burner fire cover and a burner cooker using the same, wherein the fire cover comprises an annular fire cover body, the bottom of the fire cover body is provided with a gas mixing cavity, the top of the fire cover body is provided with a fire transfer groove which penetrates along the radial direction of the fire cover body, and the fire transfer groove is in fluid communication with the gas mixing cavity, and the burner is characterized in that: the fire transmission groove is internally provided with a separator, the separator extends along the length direction of the fire transmission groove and divides the interior of the fire transmission groove into two areas, the separator is provided with a through hole, and the two areas in the fire transmission groove are in fluid communication with each other through the through hole on the separator. The fire transfer groove is divided into two areas by the partition piece, and the two areas are communicated through the through hole, so that the two areas are integrated and independent with each other, and can stabilize flames mutually, and fire transfer is stable and reliable.)

1. The utility model provides a combustor fire lid, is including being annular fire lid body (1), fire lid body (1) bottom has gas mixing chamber (11) pass fire groove (2) along its radial run-through is seted up at the top of fire lid body (1), pass fire groove (2) and gas mixing chamber (11) fluid intercommunication, its characterized in that: the fire transfer groove (2) is internally provided with a separating piece (3a,3b), the separating piece (3a,3b) extends along the length direction of the fire transfer groove (2) and divides the interior of the fire transfer groove (2) into two areas, the separating piece (3a,3b) is provided with a through hole (31a,31b), and the two areas in the fire transfer groove (2) are in fluid communication through the through hole (31a,31b) on the separating piece (3a,3 b).

2. The burner fire cover of claim 1, wherein: the fire transfer groove (2) is a cylindrical hole with a radial seam (2a) at the top, the separator (3a) is in a hollow cylinder shape, the axes of the separator and the separator are parallel or overlapped, and the side wall of the separator (3a) is provided with the through hole (31a) penetrating through the wall thickness of the separator.

3. The burner fire cover of claim 2, wherein: the fire cover comprises a fire cover body (1), and is characterized in that a strip-shaped groove (4) used for communicating a gas mixing cavity (11) with a fire transfer groove (2) is formed in the fire cover body (1), the strip-shaped groove (4) is located below the fire transfer groove (2) and extends along the length direction of the fire transfer groove (2), and the strip-shaped groove (4) is communicated with the gas mixing cavity (11) and a partition piece (3a) simultaneously.

4. The burner fire cover of claim 3, wherein: the end part of the strip-shaped groove (4) positioned at the outer side of the fire cover body (1) is expanded to form an expanded part (41), and the expanded part (41) can be communicated with the inner peripheral area and the outer peripheral area of the separating piece (3a) at the same time.

5. The burner fire cover of claim 1, wherein: the separator (3b) is vertically arranged in a plate shape, and the through hole (31b) penetrates through the wall thickness of the separator (3 b).

6. The burner fire cover of claim 5, wherein: the fire cover comprises a fire cover body (1), and is characterized in that communication holes (5) used for communicating a gas mixing cavity (11) with a fire transfer groove (2) are formed in the fire cover body (1), at least two communication holes (5) are arranged at intervals along the length direction of the fire transfer groove (2), one end of each communication hole (5) is communicated with the gas mixing cavity (11), and the other end of each communication hole is communicated with the fire transfer groove (2).

7. The burner fire cover according to any one of claims 1 to 6, wherein: pass fire groove (2) top lid and be equipped with apron (7) and have the interval between the two, apron (7) link to each other with separating parts (3a,3b) in passing fire groove (2).

8. The burner fire cover of claim 7, wherein: the fire cap body (1) comprises an annular top wall (12), an inner annular wall (13) and an outer annular wall (14), wherein the inner and outer side edges of the annular top wall (12) respectively extend vertically or obliquely downwards to form the inner annular wall (13) and the outer annular wall (14), the annular top wall (12), the inner annular wall (13) and the outer annular wall (14) are surrounded to form the air mixing cavity (11), a boss (15) radially extends towards the center of the fire cap body (1) along the inner edge of the annular top wall (12), the fire transmission groove (2) is arranged at the top of the boss (15) and the fire cap body (1) and radially penetrates through the boss (15) and the fire cap body (1), and the side wall surface (151) of the boss (15) inclines towards the direction far away from the fire transmission groove (2) from top to bottom.

9. The burner fire cover of claim 8, wherein: the top wall surface (152) of the boss (15) inclines from top to bottom towards the direction far away from the fire transfer groove (2).

10. A gas cooker to which the burner fire cover of any one of claims 1 to 9 is applied, characterized in that: this cooking utensils still includes inner ring fire lid (8), fire lid body (1) encloses to be established in inner ring fire lid (8) outside and form annular channel (81) between the two, be equipped with ignition needle (9) in annular channel (81), discharge electrode (91) of ignition needle (9) have at least two to at least wherein two discharge electrode point to respectively pass inner ring fire hole (82) of fire groove (2) and inner ring fire lid (8).

Technical Field

The invention belongs to the field of gas cookers, and particularly relates to a burner fire cover and a gas cooker applying the same.

Background

The fire transfer structure of the existing burner on the market is mainly that flame of an inner ring is transferred to a fire hole of an outer ring through a fire transfer groove so as to ignite outer ring fire; in the transmission process, because the inner ring and the outer ring are of independent structures, a fire transmission groove needs to be arranged for transmitting fire.

The outer ring fire cover of the existing gas burner generally adopts an open fire transfer groove structure, such as fire transfer groove structures disclosed in patents of Chinese invention patent with application number 201610930412.4 (publication number CN106642118A), burner fire cover of gas cooker, Chinese utility model patent with patent number 200920202204.8 (publication number CN201555225U), and Chinese utility model patent with patent number 201420411586.6 (publication number CN204006006U), burner fire cover with stable fire transfer, etc.

The open type fire transfer slot has the following defects: the first and the second open type fire transfer grooves are easy to block, namely soup flowing down from the bottom of a pan is easy to flow into the fire transfer grooves, and the fire transfer performance is influenced after the soup is blocked, which is also the main reason for the blockage maintenance of the current fire transfer grooves; secondly, the open fire transmission groove has high requirements on the air door of the stove, and after the air door is opened to a large extent, too much air can cause too high air speed, so that flame is separated or flame is released during combustion.

Aiming at the problem, the fire transfer structure and the gas stove disclosed in the Chinese utility model patent with the application number of ZL201821019791.2 (with the publication number of CN208431767U) comprise an outer fire cover and a fire transfer cover; the outer fire cover is provided with a fire leading groove and a connecting hole; the fire transfer cover is convexly provided with a connecting bulge, the fire transfer cover is arranged at the notch of the fire ignition groove and shields the fire ignition groove, and the connecting bulge extends into the connecting hole; the fire transfer cover and the groove wall and the bottom wall of the ignition groove form a fire transfer channel, the fire transfer channel penetrates through the outer fire cover, one end of the fire transfer channel is an ignition inlet, and the other end of the fire transfer channel is an ignition outlet.

This pass fire structure prevents through passing fire lid that the priming groove is blockked up, but passes the setting of fire lid and also can produce adverse effect to secondary air's entering to pass and not set up the flame stabilizing structure in the fire passageway, the flame stabilizing effect is not good.

Disclosure of Invention

The first technical problem to be solved by the invention is to provide a burner fire cover with a fire transfer groove capable of stabilizing flame to stabilize fire transfer, aiming at the current situation of the prior art.

The second technical problem to be solved by the present invention is to provide a burner fire cover with a hidden fire transfer groove and capable of further improving the flame stabilizing effect, in view of the current situation of the prior art.

The third technical problem to be solved by the invention is to provide a gas cooker applying the burner fire cover, which can prevent the ignition needle from being polluted and incapable of igniting, aiming at the current situation of the prior art.

In order to solve the first technical problem, the technical scheme adopted by the invention is as follows: the utility model provides a combustor fire lid, is including being annular fire lid body, fire lid body bottom has the chamber of mixing gas, the top of fire lid body is seted up along its radial fire groove that passes through, fire groove and the chamber of mixing gas fluid intercommunication, its characterized in that: the fire transmission groove is internally provided with a separator, the separator extends along the length direction of the fire transmission groove and separates the interior of the fire transmission groove into two areas, the separator is provided with a through hole, and the two areas in the fire transmission groove are in fluid communication with each other through the through hole on the separator.

In order to further improve the flame stabilizing effect, the first structural form of the separator is as follows: the fire transfer groove is a cylindrical hole with a radial seam at the top, the separator is in a hollow cylinder shape, the axes of the fire transfer groove and the separator are parallel or overlapped, and the side wall of the separator is provided with the through hole penetrating through the wall thickness of the separator. According to the structural form of the partition, secondary air is continuously involved at the port at the inner side of the fire transfer groove to mix small fire (the small fire burnt from the through hole) which supplements combustion of the partition abdominal wall, the secondary air is continuously involved at the outer side of the air entering the fire transfer groove, or the air entering the lower part of the dense through hole is discharged around the upper part of the circle, and the secondary air is continuously involved, and the secondary air is matched with the fire discharging mode of the dense through hole, so that the combustion is sufficient and the combustion is stable.

In order to enable mixed gas to smoothly enter the separating piece, a strip-shaped groove used for communicating the mixed gas cavity with the fire transfer groove is formed in the fire cover body, the strip-shaped groove is located below the fire transfer groove and extends along the length direction of the fire transfer groove, and the strip-shaped groove is communicated with the mixed gas cavity and the separating piece simultaneously.

In order to improve the fire transmission speed, the end part of the strip-shaped groove, which is positioned at the outer side of the fire cover body, is expanded to form an expanded part, the expanded part can be communicated with the inner surrounding area and the outer surrounding area of the separating piece at the same time, so that the expanded part can supply air to the inner surrounding area surrounded by the separating piece and also can supply air to the area (namely the outer surrounding area) outside the separating piece in the fire transmission groove, and the expanded part is arranged near the outer side of the fire cover body, so that the fire near the outer end in the fire transmission groove is slightly larger to be quickly transmitted to the main fire hole on the fire cover body.

In order to further improve the flame stabilizing effect, the second structural form of the separator is as follows: the separator is in a plate shape vertically arranged, and the through hole penetrates through the wall thickness of the separator. Thus, the two sides of the separator are integrated and independent, the small holes stabilize flame, and the effect is optimal.

In order to enable mixed gas to smoothly enter the fire transfer groove, the fire cover body is provided with at least two communication holes for communicating the mixed gas cavity with the fire transfer groove, the communication holes are arranged at intervals along the length direction of the fire transfer groove, one end of each communication hole is communicated with the mixed gas cavity, and the other end of each communication hole is communicated with the fire transfer groove.

In order to further improve the flame stabilizing effect, the inner side part of the fire cover body is provided with an inclined hole which is inclined upwards from outside to inside, an air inlet of the inclined hole, which is adjacent to the air mixing cavity, is communicated with the air mixing cavity, and an air outlet of the inclined hole, which is far away from the air mixing cavity, is arranged below an inner side port of the fire transfer groove. The inclined hole can ensure that the fire that the inner ring transmitted to the outer ring can be all spread out, and the fire spreading time is shorter, and the inclined hole itself also can play the effect of steady flame to the flame burning in the stable fire spreading groove, and then make the fire spreading more stable, reliable.

In order to solve the second technical problem, the invention adopts the following technical scheme: pass fire groove top lid and be equipped with the apron and have the interval between the two, the apron links to each other with the separator that passes in the fire groove.

In order to further prevent soup from entering the fire transfer groove to cause the blockage of the fire transfer groove, the fire cover body comprises an annular top wall, an inner annular wall and an outer annular wall, the inner annular wall and the outer annular wall are formed by respectively vertically or obliquely and downwardly extending the inner side edge and the outer side edge of the annular top wall, the inner annular wall and the outer annular wall are surrounded to form the air mixing cavity, the annular top wall radially extends towards the center of the fire cover body to form a boss, the fire transfer groove is arranged at the top of the boss and the fire cover body and radially penetrates through the boss and the fire cover body, and the side wall surface of the boss inclines towards the direction far away from the fire. The side wall surface of the boss is obliquely arranged, and soup can flow downwards along the side wall surface of the boss and is far away from the fire transfer groove.

In order to further prevent the soup from entering the fire transfer groove to cause the fire transfer groove to be blocked, the top wall surface of the boss inclines towards the direction far away from the fire transfer groove from top to bottom. Even so the hot water has fallen on the top of boss, because of its roof face slope sets up, also can flow downwards along the roof face, then flows downwards along the lateral wall face of boss and keeps away from the fire transfer groove.

In order to solve the third technical problem, the technical scheme adopted by the invention is as follows: a gas cooking appliance applying the burner fire cover is characterized in that: the stove further comprises an inner ring fire cover, the fire cover body is arranged on the outer side of the inner ring fire cover in an enclosing mode, an annular channel is formed between the inner ring fire cover and the fire cover body, an ignition needle is arranged in the annular channel, at least two discharge electrodes of the ignition needle are arranged, and at least two discharge electrodes point to the inner ring fire holes of the fire transmission groove and the inner ring fire cover respectively.

Compared with the prior art, the invention has the advantages that: 1. according to the invention, the fire transfer groove is divided into two areas by the partition, and the two areas are communicated through the through hole, so that the two areas are integrated and independent with each other, and can stabilize flames to ensure stable and reliable fire transfer; 2. according to the invention, the cover plate is arranged above the fire transfer groove, a gap is formed between the cover plate and the fire transfer groove, secondary air can enter the fire transfer groove from an opening of the fire transfer groove and can also enter the fire transfer groove from the gap, so that the entering of the secondary air is not influenced, and the flame is fully combusted; the arrangement of the separating pieces can supplement secondary air on two sides to ensure sufficient supply of the secondary air, and fire comes out on two sides, so that the fire transfer performance is better; in addition, the fire transfer groove is arranged in a hidden manner due to the arrangement of the cover plate, so that a good flame stabilizing effect can be achieved on the flame at the fire transfer groove, namely, the fire transfer is very stable under the condition that the opening degree of the air door is large, the applicability of the air door is greatly enhanced, the full combustion of the flame can be promoted due to the increase of the opening degree of the air door, the combustion efficiency of the flame is improved, and the smoke discharged by combustion is reduced; in addition, the cover plate also reduces the probability of plugging the fire transfer groove caused by the fact that soup enters the fire transfer groove; 3. the discharge electrodes of the ignition needle are at least two, so that at least two sides of the ignition needle can be ignited, and even if one discharge electrode is polluted, the ignition can not be normally ignited and does not generate sparks, other discharge electrodes can also normally work, so that the ignition needle can be reliably ignited.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 in another direction;

FIG. 3 is a cross-sectional view of FIG. 2;

FIG. 4 is a bottom view of FIG. 3;

FIG. 5 is an enlarged view of FIG. 2 at A;

FIG. 6 is an enlarged view of FIG. 3 at B;

FIG. 7 is an enlarged view at C of FIG. 4;

FIG. 8 is a schematic structural view of example 2 of the present invention;

FIG. 9 is a bottom view of FIG. 8;

FIG. 10 is an enlarged view of FIG. 8 at D;

FIG. 11 is an enlarged view at E of FIG. 9;

FIG. 12 is a cross-sectional view of FIG. 8;

FIG. 13 is an enlarged view at F of FIG. 12;

FIG. 14 is an enlarged view at G of FIG. 12;

FIG. 15 is a schematic structural view of example 3 of the present invention;

fig. 16 is an enlarged view of fig. 15 at H.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

Example 1

As shown in fig. 1 to 7, the burner fire cover of the preferred embodiment includes a ring-shaped fire cover body 1, a fire transfer groove 2 disposed on the top of the fire cover body 1, a partition 3a disposed in the fire transfer groove 2, and a cover plate 7 disposed above the fire transfer groove 2. In this embodiment, four fire transfer grooves 2 are distributed on the top of the fire cover body 1 along the fire cover body 1 in a central symmetry manner, each fire transfer groove 2 corresponds to one cover plate 7 and one separating member 3a, and one fire transfer groove 2 is taken as an example for description hereinafter. Herein, "inner" means close to the center of the fire lid body 1, and "outer" means away from the center of the fire lid body 1.

As shown in fig. 1 to 4, the fire lid body 1 includes an annular top wall 12, and an inner annular wall 13 and an outer annular wall 14, which are respectively formed by vertically or obliquely extending downward inner and outer side edges of the annular top wall 12, the inner annular wall 13 and the outer annular wall 14 surround to form a gas mixing cavity 11 located at the bottom of the fire lid body 1, and the outer annular wall 14 is provided with a plurality of main fire holes 16 along the circumferential direction.

As shown in fig. 3, a boss 15 is formed to extend radially from the inner edge of the annular top wall 12 toward the center of the fire lid body 1, the bottom of the boss 15 is located on the inner annular wall 13, and the fire transfer groove 2 is formed at the top of the boss 15 and the fire lid body 1 and radially penetrates through the boss 15 and the fire lid body 1 to communicate the inside and the outside of the fire lid body 1.

As shown in fig. 3, 5 and 6, the partition 3a extends along the length direction of the fire transfer slot 2 and divides the interior of the fire transfer slot 2 into two regions, the partition 3a is provided with a through hole 31a, and the two regions in the fire transfer slot 2 are in fluid communication through the through hole 31a of the partition 3 a.

In this embodiment, the fire transfer groove 2 is a cylindrical hole with a radial slit 2a at the top, the partition member 3a is in a hollow cylinder shape, the axes of the two are parallel or coincident, preferably coincident, so that the partition member 3a and the fire transfer groove 2 are concentric, and the opposite side walls of the partition member 3a are provided with through holes 31a penetrating the wall thickness of the partition member, in this embodiment, the through holes 31a are arranged on the two side walls of the partition member 3a corresponding to the width direction of the fire transfer groove 2, and the partition member 3a is connected with the bottom wall of the fire transfer groove 2 through the first connecting strip 33 a.

The structural form of the partition 3a enables the ports at the inner side of the fire transfer groove 2 to be continuously involved with secondary air to mix and supplement small fire (small fire burning from the through hole 31a) burning on the abdominal wall of the partition 3a, the air enters from the inner side of the fire transfer groove 2 and goes out of fire, or the air enters from the lower part of the dense through hole 31a and goes out of fire around the upper part of a circle, so that the secondary air is continuously involved, and the secondary air is matched with the fire going mode of the dense through hole 31a, so that the combustion is sufficient and the combustion is stable.

As shown in fig. 4 and 7, the fire transfer groove 2 is in fluid communication with the gas mixing chamber 11, in this embodiment, a strip-shaped groove 4 for communicating the gas mixing chamber 11 with the fire transfer groove 2 is formed in the fire lid body 1, so that the mixed gas can smoothly enter the partition 3a, the strip-shaped groove 4 is located below the fire transfer groove 2 and extends along the length direction of the fire transfer groove 2, and the drawing groove 4 is simultaneously communicated with the gas mixing chamber 11 and the partition 3a, that is, the strip-shaped groove 4 is located between the gas mixing chamber 11 and the partition 3 a.

As shown in fig. 7, the end of the strip-shaped groove 4 located outside the fire lid body 1 is enlarged to form an enlarged portion 41, the enlarged portion 41 can communicate with both the inner peripheral area and the outer peripheral area of the partitioning member 3a, so that the enlarged portion 41 can supply air to both the inner peripheral area surrounded by the partitioning member 3a and the area outside the partitioning member 3a (i.e., the outer peripheral area) in the fire chute 2, and the enlarged portion 41 is provided adjacent to the outside of the fire lid body 1 so that the fire in the fire chute 2 adjacent to the outer end is slightly enlarged to be rapidly delivered to the main fire holes 16 in the fire lid body 1. The partition 3a mentioned above partitions the inside of the fire chute 2 into two regions, an "inner peripheral region" and an "outer peripheral region".

The inner side part of the fire cover body 1 is provided with an inclined hole 6a which is inclined upwards from outside to inside, an air inlet 61a of the inclined hole 6a, which is adjacent to the air mixing cavity 11, is communicated with the strip-shaped groove 4, and further communicated with the air mixing cavity 11, and an air outlet 62a of the inclined hole 6a, which is far away from the air mixing cavity 11, is arranged below an inner side port of the fire transfer groove 2. The inclined hole 6a can ensure that the fire that the inner ring transmitted to the outer ring can be all spread out, and spread the fire for a short time, and inclined hole 6a itself also can play the effect of steady flame moreover to the flame burning in the stable fire transmission groove 2, and then make to spread the fire more stable, reliable.

As shown in fig. 5 and 6, the partition 3a is provided with a second connecting bar 34a extending from the radial slit 2a to the fire transfer groove 2, and the second connecting bar 34a is connected to the cover plate 7 so that the fire transfer groove 2 is spaced apart from the cover plate 7. The cover plate 7 and the fire transfer groove 2 are spaced, and secondary air can enter the fire transfer groove 2 from the spacing without influencing the entrance of the secondary air, so that flame can be fully combusted, the secondary air can be supplemented from two sides, and the fire transfer performance is better; in addition, the fire transfer groove 2 is arranged in a hidden manner due to the arrangement of the cover plate 7, so that a good flame stabilizing effect can be achieved on the flame at the fire transfer groove 2, namely, the fire transfer is very stable under the condition that the opening degree of the air door is large, the applicability of the air door is greatly enhanced, the sufficient combustion of the flame can be promoted due to the increase of the opening degree of the air door, the combustion efficiency of the flame is improved, and the smoke discharged by combustion is reduced; in addition, the cover plate 7 also reduces the probability that the fire transfer groove 2 is blocked when soup enters the fire transfer groove 2.

In addition, the side wall surface 151 of the boss 15 is inclined from the top to the bottom in the direction away from the fire transfer groove 2, and the top wall surface 152 of the boss 15 is also inclined from the top to the top in the direction away from the fire transfer groove 2. Thus, even if the soup falls on the top of the boss 15, the soup flows down along the top wall surface 152 due to the inclined top wall surface 152, and then flows down along the side wall surface 151 of the boss 15 to be away from the fire-transfer groove 2.

Example 2

As shown in fig. 8 to 14, example 2 differs from example 1 in that: the structure of the partition 3b is different from that of the fire transfer groove 2, and the partition 3b of the present embodiment is plate-shaped, and the longitudinal section of the fire transfer groove 2 is C-shaped.

In this embodiment, the partition member 3b is vertically disposed in a plate shape, and the upper end of the partition member extends out of the fire transfer groove 2 to be connected with the cover plate 7, so that the fire transfer groove 2 is divided into two regions by the partition member 3b along the width direction thereof, the two regions are respectively located at two sides of the partition member 3b, and the through hole 31b penetrates through the wall thickness of the partition member 3 b. Therefore, the two sides of the separating piece 3b are mutually integrated and independent, the small holes (namely the through holes 31b) stabilize flame, the effect is optimal, the fire transfer is more smooth and is not influenced by the large opening and the small opening of the air doors, secondary air can be supplemented on two sides, fire is discharged on two sides, and the fire transfer performance is better.

In addition, the fire cover body 1 is provided with at least two communication holes 5 for communicating the gas mixing cavity 11 and the fire transfer groove 2, the communication holes 5 are arranged at intervals along the length direction of the fire transfer groove 2, one end of each communication hole 5 is communicated with the gas mixing cavity 11, and the other end is communicated with the fire transfer groove 2, so that the gas mixture can smoothly enter the fire transfer groove 2. In this embodiment, two communication holes 5 are provided, one is vertically arranged, and the other is obliquely arranged from top to bottom, and the air inlet 61b of the oblique hole 6b adjacent to the air mixing chamber 11 is communicated with the obliquely arranged communication hole 5.

Example 3

Embodiment 3 is a gas cooker to which the fire cover of embodiment 2 is applied:

as shown in fig. 15 and 16, the cooker further comprises a base 0 and an inner ring fire cover 8, the fire cover body 1 is enclosed outside the inner ring fire cover 8 and forms an annular channel 81 between the inner ring fire cover and the inner ring fire cover, an ignition needle 9 is arranged in the annular channel 81, two discharge electrodes 91 of the ignition needle 9 are provided, and the two discharge electrodes 91 are respectively directed to the inner ring fire hole 82 and the fire transfer groove 2 of the inner ring fire cover 8, so that even if one discharge electrode 91 is polluted and can not work, the other discharge electrode can work to ignite.

The fire cover body 1, the inner ring fire cover 8 and the ignition needle 9 are all disposed on the base 0, which is the prior art and will not be described herein.