Excitation source sealing structure of excitation fuse

Abstract

The utility model belongs to the field of electric power control and electric automobiles, and particularly relates to an excitation source sealing structure of an excitation fuse, which comprises a shell with an accommodating cavity, an electronic igniter, a protective sleeve and a piston, a through hole for forming a limiting structure is formed in the top of the shell, and the electronic igniter is arranged in the limiting structure in an assembly self-sustaining mode; the protective sleeve is positioned in the shell to support the electronic igniter; the piston is positioned in the accommodating cavity or the protective sleeve; a first sealing structure is arranged on the contact face of the junction of the electronic igniter, the shell and the protective sleeve, and the protective sleeve supports and fixes the first sealing structure. The electronic igniter is simple in structure, the base is completely or partially replaced by the shell, the electronic igniter is installed and supported in cooperation with the protective sleeve, the assembly procedure is simplified, and the production cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of power control and electric vehicles, and relates to an excitation fuse with an excitation source for circuit protection, in particular to an excitation source sealing structure of the excitation fuse. Background Art

[0002] At present, the excitation source, that is, the power source, used in the excitation fuse is a micro gas generator. The micro gas generator includes an electric igniter and a base structure. The electronic igniter is sealed and installed through the base structure, so that its installation and sealing performance are relatively high, and the level of dangerous goods judgment is relatively low. Its disadvantage is that the current base structure is made of aluminum, which is relatively expensive. When it is used in an excitation fuse, the excitation source is arranged at a through hole opened on the shell, and the electric igniter is partially located at the through hole. The electric igniter is pressed and fixed by the base structure, and sealed, such as the excitation source structure in a dual-port excitation fuse disclosed in Chinese Patent 202122844896X.

[0003] However, the base material of this type of excitation source structure is aluminum, which is expensive. Moreover, when used in some other excitation fuses, a pressing plate may be required for further pressing and fixing, resulting in more assembly parts and more assembly processes. Summary of the invention

[0004] The purpose of the present invention is to provide an excitation source sealing structure for an excitation source fuse, in which a base is fully or partially integrally formed on a shell, and cooperates with a protective cover to support and seal an electronic igniter, thereby reducing the number of parts, reducing production costs, and improving product safety performance.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the present invention is an excitation source sealing structure of an excitation fuse, comprising a shell, an electronic igniter, a protective sleeve and a piston; a containing cavity is provided on the shell, a through hole connected to the containing cavity is provided on the top of the shell, a limiting structure is integrally formed in the through hole, the electronic igniter is located in the limiting structure in an assembled self-sustaining manner, and a gas release end of the electronic igniter is located in the containing cavity;

[0006] The protective cover is located in the accommodating cavity, one end of the protective cover is located at the periphery of the gas release end of the electronic igniter, and contacts the top of the shell and the outer peripheral surface of the electronic igniter located in the accommodating cavity to form support for the electronic igniter;

[0007] The piston is located in the accommodating cavity or in the protective sleeve, and the piston is in sealing contact with the inner wall of the accommodating cavity or the protective sleeve; when the piston is located in the accommodating cavity, the protective sleeve is located between the piston and one end surface of the driving force released by the electronic igniter;

[0008] A first sealing structure is arranged between the end of one end of the contact surface between the electronic igniter and the shell in the accommodating cavity and the protective sleeve, and the protective sleeve supports and fixes the first sealing structure.

[0009] Preferably, when the piston is located in the protective sleeve, at least one second sealing structure is provided between the contact surface of the protective sleeve and the housing, and the second sealing structure is arranged at intervals on the periphery of the first sealing structure.

[0010] Preferably, the second sealing structure is formed by arranging a soft sealing member on the contact surface between the protective sleeve and the shell, or by interference fit between the shell and the protective sleeve.

[0011] Preferably, the end of the protective cover facing the top of the shell is a closed end, and a through hole is provided at the closed end for the gas release end of the electronic igniter to pass through, and the through hole through which the gas release end of the electronic igniter passes through the protective cover is located in the protective cover; in the accommodating cavity, a circle of limiting grooves is formed between the outer side surface of the electronic igniter and the top of the shell, and a limiting ridge is provided on the end surface of the closed end of the protective cover corresponding to the limiting groove, and the limiting ridge is spaced apart from the through hole of the closed end of the protective cover; the limiting ridge of the protective cover is nested in the limiting groove between the electronic igniter and the top of the shell, and the limiting ridge is combined with the shell to form a protective and supportive positioning for the outer side surface of the electronic igniter; the first sealing structure is provided in the adjacent area of ​​the electronic igniter, the shell and the protective cover at the contact surface of the nested limiting ridge and the limiting groove, and the second sealing structure is provided between the contact surface of the limiting groove and the limiting ridge that is not in contact with the electronic igniter.

[0012] Preferably, when at least one group of nested limiting grooves and limiting ridges are respectively arranged between the contact surfaces of the top of the shell away from the electronic igniter and the closed end of the protective cover, the second sealing structure is only arranged between at least one group of contact surfaces of the limiting grooves and the limiting ridges between the top of the shell and the closed end of the protective cover; or, the second sealing structure is arranged between the contact surfaces of each group of nested limiting grooves and the limiting ridges.

[0013] Preferably, the end of the protective cover facing the top of the shell is a closed end, and a through hole is opened at the closed end for the gas release end of the electronic igniter to pass through, the through hole through which the gas release end of the electronic igniter passes through the protective cover is located in the protective cover, and the end face of the closed end of the protective cover on the outer peripheral side of the through hole is combined with the shell to form a enclosure and support for the electronic igniter; in the accommodating cavity, at least one circle of limiting grooves are arranged at intervals on the top of the shell at the outer periphery of the electronic igniter, and the limiting grooves are arranged at intervals with the outer periphery of the electronic igniter; the limiting ridge is arranged on the end face of the closed end of the protective cover corresponding to the limiting groove, the limiting ridge of the protective cover is nested in the limiting groove, and the second sealing structure is arranged between the contact surface of the limiting groove and the limiting ridge.

[0014] Preferably, the protective cover is integrally formed on the end surface of the piston facing the electronic igniter, and one end of the protective cover facing the electronic igniter is penetrated through the outer periphery of the electronic igniter part in the accommodating cavity, and rests against the end where the electronic igniter contacts the top of the shell, thereby providing support for the first sealing structure; the piston is in sealing contact with the accommodating cavity of the shell.

[0015] Preferably, an annular limiting edge with a certain elasticity is formed at the edge of the end face of the piston facing the electronic igniter and extends toward the electronic igniter, and the end of the annular limiting edge facing the electronic igniter is inclined toward the inner wall of the accommodating cavity of the shell, and the maximum outer diameter of the annular limiting edge is larger than the inner diameter of the accommodating cavity in contact with it; when the piston is placed in the accommodating cavity, the end of the annular limiting edge retracts under the pressure of the inner wall of the accommodating cavity, so that the piston is in sealing contact with the accommodating cavity of the shell.

[0016] Preferably, the first sealing structure is a soft sealing component.

[0017] Preferably, the second sealing structure is a soft sealing member provided between the contact surface of the limiting groove and the limiting ridge, or the second sealing structure is formed by interference fit between the limiting groove and the limiting ridge.

[0018] The present invention realizes installation support for the electronic igniter by integrally forming the entire base or part of the base on the shell, and cooperates with the protective cover structure to form a complete base. The first sealing structure is formed by arranging a seal between the contact surfaces of the electronic igniter, the shell and the protective cover to avoid gas leakage from the contact surface between the shell and the electronic igniter to the outside of the shell, resulting in insufficient piston power. At the same time, by integrally forming the base or part of the base on the shell, when the base is partially formed, another part of the base is integrally formed on the protective cover, and the installation support for the electronic igniter is realized by the shell, or the combination of the shell and the protective cover, which reduces the number of parts, simplifies the assembly process, and reduces the production cost of the excitation fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the cooperation of a shell, an electronic igniter and a protective cover, wherein the base is completely integrally formed on the shell.

[0020] Figure 2 This is another structural schematic diagram of the shell, electronic igniter and protective cover. The base is partially integrally formed on the shell, and partially formed on the protective cover.

[0021] Figure 3 It is a schematic diagram of the structure of the shell, the electronic igniter and the protective cover. The base is partially formed on the shell and partially formed on the protective cover.

[0022] Figure 4 It is a schematic diagram of the structure of the shell, electronic igniter and piston, and the base is completely integrally formed on the shell.

[0023] Reference numerals:

[0024] Shell 1, electronic igniter 2, protective sleeve 3, piston 4, accommodating cavity 11, through hole 12, limiting structure 13, first sealing structure 20, second sealing structure 21, limiting rib 31, limiting rib 32, limiting rib 33, annular limiting edge 41. DETAILED DESCRIPTION

[0025] The excitation source sealing structure of the excitation fuse of the present invention comprises a shell, an electronic igniter, a protective sleeve and a piston; a housing cavity is provided on the shell, a through hole connected to the housing cavity is provided on the top of the shell, a limiting structure is integrally formed in the through hole, the electronic igniter is located in the limiting structure in an assembled self-sustaining manner, and a gas release end of the electronic igniter is located in the housing cavity;

[0026] The protective cover is located in the accommodating cavity, one end of the protective cover is located at the periphery of the gas release end of the electronic igniter, and contacts the top of the shell and the peripheral surface of the electronic igniter located in the accommodating cavity to form support for the electronic igniter;

[0027] The piston is located in the accommodating cavity or in the protective sleeve, and the piston is in sealing contact with the inner wall of the accommodating cavity or the protective sleeve; when the piston is located in the accommodating cavity, the protective sleeve is located between the piston and an end surface of the driving force released by the electronic igniter;

[0028] A first sealing structure is arranged between the end of one end of the contact surface between the electronic igniter and the shell in the accommodating cavity and the protective sleeve, and the protective sleeve supports and fixes the first sealing structure.

[0029] When the piston is located in the protective sleeve, at least one second sealing structure is arranged between the contact surface of the protective sleeve and the housing, and the second sealing structure is arranged at intervals on the periphery of the first sealing structure.

[0030] The first sealing structure is a sealing member made of soft material, and the sealing member is located between the contact surfaces of the electronic igniter, the housing and the protective cover. The second sealing structure is a soft sealing member arranged between the contact surfaces of the housing and the protective cover, or an interference fit structure is formed between the contact surfaces of the housing and the protective cover.

[0031] The seal is made of soft material, such as rubber.

[0032] With respect to the above technical solution, preferred embodiments are now given for specific description.

[0033] The excitation source sealing structure of the excitation fuse is shown in Figure 1 , including a shell 1, an electronic igniter 2, and a protective cover 3. Among them, a housing cavity 11 for the installation and displacement of the piston is opened in the shell 1, and a through hole 12 is opened on the top of the shell 1, and the through hole 12 connects the cavity inside the shell 1 and the outside. A limiting structure 13 for serving as a base of the electronic igniter is integrally formed on the outer periphery of the through hole 12 on the shell 1. The electronic igniter 2 is assembled in the limiting structure 13 of the through hole 12 in a self-sustaining manner. The self-sustaining manner is a tight fitting manner. The electronic igniter 2 is installed and sealed by the limiting structure 13 to prevent the electronic igniter 2 from flying out of the shell 1 when it is impacted, causing a safety hazard. At the top of the housing cavity 11 of the shell 1, on the outer periphery of the through hole 12, a circle of limiting grooves are opened at a certain distance.

[0034] The protective cover 3 has a closed end at one end facing the electronic igniter 2 and an open end at the other end away from the electronic igniter 2. A through hole is provided at the position of the closed end of the protective cover 3 corresponding to the through hole 12 of the shell for the gas release end of the electronic igniter 2 to pass through. The gas release end of the electronic igniter 2 passes through the through hole on the closed end of the protective cover 3. The through hole on the protective cover 3 opens at one end toward the top of the shell 1 to form a trumpet-shaped structure to support the electronic igniter 2. A first sealing structure 20 is provided in the accommodating cavity 11 and at the end of the contact surface between the electronic igniter 2 and the shell 1. The end surface of the closed end of the protective cover 3 contacts the top of the shell 1 on the outer side of the electronic igniter 2 to form a support and positioning for the first sealing structure 20. The contact surface between the electronic igniter 2 and the through hole of the shell 1 is sealed by the first sealing structure 20 to prevent the high-pressure gas serving as the driving force from leaking to the outside of the shell, resulting in insufficient power for the driving piston. When the protective cover 3 is in tight contact with the first sealing structure 20, the first sealing structure simultaneously seals the contact surfaces between the housing, the electronic igniter, and the protective cover to achieve all-round sealing. The first sealing structure 20 is a seal made of soft material, such as a sealing rubber ring. The closed end of the protective cover 3 is combined with the end surface portion outside the through hole for the electronic igniter to pass through and the electronic igniter passing through the through hole to form a final end closed structure of the protective cover 3. Therefore, except for the open end of the protective cover 3 and the through hole through which the electronic igniter passes, the protective cover 3 is in contact with the inner wall of the accommodating cavity 11 of the housing 1. When the electronic igniter releases high-pressure gas, the protective cover 3 can withstand the impact force to achieve protection of the housing 1.

[0035] A circle of limiting ridges 31 is arranged at the end surface of the closed end of the protective sleeve 3 corresponding to the limiting groove of the housing 1, and the limiting ridges 31 are inserted into the limiting groove in an interference manner to form the second sealing structure 21. In other embodiments, the limiting ridges 31 may not be inserted into the limiting groove in an interference manner, but a sealing member is arranged between the contact surface of the limiting ridges 31 and the limiting groove of the housing to form the second sealing structure 21. Figure 1 In the embodiment, a seal is provided between the contacting outer side surfaces of the limiting ridge 31 and the limiting groove to form a second sealing structure 21. The seal is made of a soft material, such as rubber. The second sealing structure 21 seals the contact surface between the protective sleeve 3 and the housing 1 to prevent the gas released by the electronic igniter from leaking from the contact surface between the housing 1 and the protective sleeve 3, thereby affecting the displacement of the piston.

[0036] The first sealing structure 20 and the second sealing structure 21 can well achieve sealing between the housing and the electronic igniter, and between the housing and the protective cover to prevent gas leakage. In other embodiments, the first sealing structure 20 alone can also achieve sealing between the housing and the electronic igniter.

[0037] Another embodiment of the present invention, see Figure 2A limiting structure 13 is integrally provided at one end of the through hole 12 of the shell 1 toward the protective cover. The limiting structure 13 replaces part of the base of the electronic igniter 2. The electronic igniter 2 is assembled at the limiting structure 13 of the through hole 12 in a self-sustaining manner. The top of the accommodating cavity 11 is an arc-shaped gradually shrinking variable cross-section structure. Therefore, a limiting groove is formed between the electronic igniter 2 and the top of the accommodating cavity 11 of the shell 1. A first sealing structure 20 is provided at the end of the contact surface between the electronic igniter 2 and the shell 1 in the limiting groove.

[0038] The protective cover 3 is closed at one end and open at the other end. A through hole is provided at the closed end of the protective cover 3 for the gas release end of the electronic igniter 2 to pass through. Corresponding to the limiting groove between the electronic igniter 2 and the top of the accommodating cavity 11 of the shell, a circle of limiting ribs 32 is integrally formed on the end face of the outer peripheral side of the through hole of the protective cover 3. The limiting ribs 32 of the protective cover 3 and the end face of the protective cover 3 between the through hole are in a trumpet-shaped structure. The limiting ribs 32 of the protective cover and the end face of the trumpet-shaped structure replace part of the base, and cooperate with the limiting structure 13 of the shell to form a complete base.

[0039] The through hole at the closed end of the protective cover 3 is sleeved on the periphery of the gas release end of the electronic igniter 2, so that the gas release end of the electronic igniter 2 is located inside the protective cover 3. The limiting rib 32 of the protective cover 3 is nested in the limiting groove formed between the electronic igniter 2 and the top of the accommodating cavity 11, so that the limiting rib 32 surrounds the outer surface of the electronic igniter 2 located in the accommodating cavity 11, and the electronic igniter 2 is supported by the trumpet-shaped end surface between the limiting rib 32 and the through hole of the protective cover 3. The limiting structure 13 of the shell and the limiting rib 32 of the protective cover 3 are combined with the replacement base to form a enclosure and support for the electronic igniter 2.

[0040] A second sealing structure 21 is provided between the contact surface of the limiting ridge 32 and the limiting groove. The second sealing structure 21 can be formed by interference fit between the contact surface of the limiting ridge 32 and the limiting groove, or a sealing member can be provided between the contact side surface of the limiting ridge 32 and the limiting groove away from the electronic igniter 2 to form the second sealing structure 21.

[0041] Another embodiment of the present invention, see Figure 3 ,exist Figure 2 On the basis of this, a circle of limiting grooves are arranged at intervals on the top of the accommodating cavity 11 of the shell 1, away from the limiting groove of the electronic igniter 2. Correspondingly, a corresponding limiting ridge 33 is arranged on the end face of the closed end of the protective cover 3, and the limiting ridge 33 is nested in the limiting groove.

[0042] The limiting ridge 32 in contact with the electronic igniter 2 is tightly matched with the corresponding limiting groove, and no second sealing structure is provided.

[0043] The limiting ridge 33 and the corresponding limiting groove are fitted in an interference fit manner to form the second sealing structure 21 , or a sealing member is provided between the contact surfaces of the limiting ridge 33 and the corresponding limiting groove to form the second sealing structure 21 .

[0044] Another embodiment of the present invention, see Figure 4 A through hole 12 is provided on the top of the housing 1, and a limiting structure 13 is formed around the through hole 12. The limiting structure 13 directly replaces the base of the electronic igniter 2. The electronic igniter 2 is assembled in the limiting structure 13 in a self-supporting manner. A first sealing structure 20 is provided in the accommodating cavity 11 at the end of the contact surface between the electronic igniter 2 and the housing 1.

[0045] The protective sleeve 3 is integrally formed on the end surface of the piston 4 facing the electronic igniter 2, and the end surface of the protective sleeve 3 facing the electronic igniter 2 is set as an inclined surface. The end edge of the piston 4 facing the electronic igniter 2 extends toward the electronic igniter 2 to form an annular limiting edge 41, and the end of the annular limiting edge 41 facing the electronic igniter is inclined outward to form an outward-turned lip-tongue structure, which has a certain elasticity, and the outer diameter of the lip-tongue structure of the annular limiting edge is greater than the inner diameter of the accommodating cavity 11 in contact with it.

[0046] When the piston 3 is installed in the accommodating cavity 11, the end surface of the protective sleeve 3 integrally formed on the piston 3, which is arranged as an inclined surface, abuts against the electronic igniter 2 and contacts the first sealing structure 20, respectively supporting the first sealing structure 20 and the electronic igniter 2. The protective sleeve 3 on the piston 4 presses the first sealing structure 20 to achieve sealing between the electronic igniter 2, the housing 1, and the protective sleeve 3.

[0047] The lip-tongue structure of the annular limiting edge 41 on the piston 4 is interference-fitted with the inner wall of the accommodating cavity 11 , and deforms under the pressure of the inner wall of the accommodating cavity 11 , forming a sealed contact between the contact surfaces of the piston 4 and the housing 1 .

[0048] In other embodiments, the piston 4 may not be provided with an annular limiting edge, and a circle of sealing members may be provided on the periphery of the contact surface between the piston 4 and the accommodating cavity 11 to achieve sealed contact between the contact surfaces of the piston and the housing 1 .

[0049] Above Figures 1 to 3 In the embodiment, the piston is arranged in the protective sleeve, and the contact surfaces of the piston and the protective sleeve are in sealed contact, and the sealed contact can be achieved by arranging a sealing member on the outer periphery of the piston.

[0050] The above-mentioned sealing members are all made of soft materials, such as rubber sealing rings.

[0051] In the present invention, the first sealing structure is necessary, and the second sealing structure can be set as needed. This is because the gas release end of the electronic igniter is located in the protective sleeve, and the released gas is located in the protective sleeve, and acts on the force-bearing end face of the piston for the first time to drive the piston to move. If the first sealing structure is not set, the gas released by the electronic igniter leaks to the outside of the shell through the gap between the contact surface of the electronic igniter and the shell, causing the gas pressure in the shell to drop instantly, which will cause insufficient power of the piston and affect the normal operation of the piston. If the second sealing structure is not set, since the piston and the shell, or the piston and the protective sleeve are in sealed contact, the space between the piston and the top of the shell is limited, and the gap between the protective sleeve and the contact surface of the shell is very small. Therefore, even if the second sealing structure is not set, the gas pressure reduction is within a reasonable range and will not affect the displacement of the piston.

[0052] Through the above-mentioned embodiments, the base of the electronic igniter is completely or partially integrally formed on the shell to form an installation limit for the electronic igniter. A part of the base can also be integrally formed on the protective cover in the form of a limiting convex ridge, and the protective cover is combined with the shell to form a complete base structure. The shell and the protective cover of the above-mentioned embodiments are integrally injection molded with plastic material, and the aluminum material of the base is replaced by plastic material, which also reduces the number of parts, reduces the assembly process, and reduces the production cost of the product.

[0053] The first sealing structure and the second sealing structure are arranged to prevent gas leakage of the electronic igniter, thereby improving the working safety performance and working reliability of the fuse.

Claims

1. An excitation source sealing structure of an excitation fuse, characterized in that: It includes a housing, an electronic igniter, a protective sleeve and a piston; The shell is provided with a receiving cavity, a through hole communicating with the receiving cavity is provided on the top of the shell, a limiting structure is integrally formed in the through hole, the electronic igniter is located in the limiting structure in an assembled self-sustaining manner, and a gas release end of the electronic igniter is located in the receiving cavity; The protective cover is located in the accommodating cavity, one end of the protective cover is located at the periphery of the gas release end of the electronic igniter, and contacts the top of the shell and the outer peripheral surface of the electronic igniter located in the accommodating cavity to form support for the electronic igniter; The piston is located in the accommodating cavity or in the protective sleeve, and the piston is in sealing contact with the inner wall of the accommodating cavity or the protective sleeve; when the piston is located in the accommodating cavity, the protective sleeve is located between the piston and one end surface of the driving force released by the electronic igniter; A first sealing structure is arranged between the end of one end of the contact surface between the electronic igniter and the shell in the accommodating cavity and the protective sleeve, and the protective sleeve supports and fixes the first sealing structure.

2. The excitation source sealing structure according to claim 1, characterized in that: When the piston is located in the protective sleeve, at least one second sealing structure is arranged between the contact surface of the protective sleeve and the housing, and the second sealing structure is arranged at intervals on the outer periphery of the first sealing structure.

3. The excitation source sealing structure according to claim 2, characterized in that: The second sealing structure is formed by arranging a soft sealing member on the contact surface between the protective sleeve and the shell, or by interference fit between the shell and the protective sleeve.

4. The excitation source sealing structure according to claim 3, characterized in that: One end of the protective cover facing the top of the shell is a closed end, and a through hole is provided at the closed end for the gas release end of the electronic igniter to pass through, and the through hole through which the gas release end of the electronic igniter passes through the protective cover is located in the protective cover; in the accommodating cavity, a circle of limiting grooves is formed between the outer side surface of the electronic igniter and the top of the shell, and a limiting ridge is provided on the end surface of the closed end of the protective cover corresponding to the limiting groove, and the limiting ridge is spaced apart from the through hole at the closed end of the protective cover; the limiting ridge of the protective cover is nested in the limiting groove between the electronic igniter and the top of the shell, and the limiting ridge is combined with the shell to form a protective and supportive positioning for the outer side surface of the electronic igniter; the first sealing structure is provided in the adjacent area of ​​the electronic igniter, the shell and the protective cover at the contact surface of the nested limiting ridge and the limiting groove, and the second sealing structure is provided between the contact surface of the limiting groove and the limiting ridge that is not in contact with the electronic igniter.

5. The excitation source sealing structure according to claim 4, characterized in that: When at least one set of nested limiting grooves and limiting ridges are respectively arranged between the contact surfaces of the top of the shell away from the electronic igniter and the closed end of the protective cover, the second sealing structure is only arranged between at least one set of contact surfaces of the limiting grooves and the limiting ridges between the top of the shell and the closed end of the protective cover; or, the second sealing structure is arranged between the contact surfaces of each set of nested limiting grooves and the limiting ridges.

6. The excitation source sealing structure according to claim 3, characterized in that: One end of the protective cover facing the top of the shell is a closed end, and a through hole is opened at the closed end for the gas release end of the electronic igniter to pass through, and the through hole through which the gas release end of the electronic igniter passes through the protective cover is located in the protective cover, and the end face of the closed end of the protective cover on the outer peripheral side of the through hole is combined with the shell to form a enclosure and support for the electronic igniter; in the accommodating cavity, at least one circle of limiting grooves are arranged at intervals on the top of the shell at the outer periphery of the electronic igniter, and the limiting grooves are arranged at intervals with the outer periphery of the electronic igniter; a limiting ridge is arranged on the end face of the closed end of the protective cover corresponding to the limiting groove, and the limiting ridge of the protective cover is nested in the limiting groove, and the second sealing structure is arranged between the contact surface of the limiting groove and the limiting ridge.

7. The excitation source sealing structure according to claim 1, characterized in that: The protective cover is integrally formed on the end surface of the piston facing the electronic igniter, and one end of the protective cover facing the electronic igniter is penetrated through the outer periphery of the electronic igniter part in the accommodating cavity, and abuts against the end where the electronic igniter contacts the top of the shell, thereby providing support for the first sealing structure; the piston is in sealing contact with the accommodating cavity of the shell.

8. The excitation source sealing structure according to claim 7, characterized in that: An annular limiting edge with a certain elasticity is formed at the edge of the end face of the piston facing the electronic igniter and extends toward the electronic igniter. The end of the annular limiting edge facing the electronic igniter is inclined toward the inner wall of the accommodating cavity of the shell, and the maximum outer diameter of the annular limiting edge is larger than the inner diameter of the accommodating cavity in contact with it. When the piston is placed in the accommodating cavity, the end of the annular limiting edge retracts under the pressure of the inner wall of the accommodating cavity, so that the piston is in sealing contact with the accommodating cavity of the shell.

9. The excitation source sealing structure according to any one of claims 1 to 8, characterized in that: The first sealing structure is a soft sealing component.

10. The excitation source sealing structure according to any one of claims 4 to 6, characterized in that: The second sealing structure is a soft sealing member arranged between the contact surface of the limiting groove and the limiting ridge, or the second sealing structure is formed by interference fit between the limiting groove and the limiting ridge.

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