Piston structure for excitation fuse and excitation fuse

Abstract

The utility model belongs to the field of circuit protection, and relates to a piston structure for an excitation fuse and the excitation fuse, and the piston structure comprises a sleeve part, a sealing part and an impact part which are integrally formed and connected in sequence. The sleeve part is used for improving the airflow direction of high-pressure gas released by an electronic igniter of the excitation fuse; a sealing structure is arranged on the outer side surface of the sealing part and is used for sealing a gap between the contact surfaces of the piston structure and the excitation fuse shell; and the impact part is used for cutting off a conductive piece on the excitation fuse. The piston is integrally formed, motion guidance is formed for high-pressure gas released by the electronic igniter through the sleeve part, the power of the piston is improved, and the opening condition of the high-pressure gas release end of the electronic igniter is restrained.

Description

Technical Field

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

[0002] As a circuit protection device, the excitation fuse generally includes a housing, an electronic igniter, a piston, and a conductive part. The conductive part can be connected in series with the protection circuit. The electronic igniter is used to release high-pressure gas as high-pressure gas to drive the piston to move, provide kinetic energy for the piston, and cut off the conductive part through the kinetic energy of the piston, so that the conductive part is disconnected, thereby disconnecting the protection circuit and realizing circuit protection.

[0003] As an important part of the product, the piston's main function is to seal the high-pressure gas so that all the high-pressure gas acts on the piston and transmits kinetic energy through the piston.

[0004] The sealing requirement for high-pressure gas is that the higher the sealing, the better, but the more sufficient the kinetic energy is, the more beneficial it is to the performance of the product. For example, if the impact speed is too fast, the greater the impact force, the greater the test on the strength of the shell. For example, the faster the impact speed, the shorter the time difference, the shorter the time left for the arc-extinguishing fuse, and the energy absorbed by the arc-extinguishing fuse is limited, resulting in the fracture of the conductive part connected in parallel with it to bear a relatively large arc energy. For example, at the beginning of the detonation, the volume of the explosion cavity is too small, resulting in a sharp increase in the instantaneous detonation pressure, causing the upper shell of the explosion chamber to bear huge pressure, which forms a sharp test on the strength of the shell. For example, when the sealing of the sealed chamber is relatively poor, insufficient power leads to insufficient power; for this reason, the structure of the piston plays a vital role in improving these properties. For example, Chinese Patent 2023206796724 discloses a circuit protection device with an exhaust structure and a piston structure in an excitation fuse. Summary of the invention

[0005] The purpose of the present invention is to provide a piston structure for an excitation fuse and an excitation fuse, which mainly improves the kinetic energy transmitted by the piston from aspects such as energy absorption and energy consumption, and eddy current improves the direction of air flow. On the one hand, the breaking performance of the product is improved, and on the other hand, the requirement for the shell strength is reduced.

[0006] To achieve the above-mentioned purpose, the technical solution provided by the present invention is a piston structure for an excitation fuse, the piston structure comprising a sleeve part, a sealing part and an impact part which are integrally formed and connected in sequence; the sleeve part is provided at one end of the sealing part, and the impact part is provided at the other end; the sleeve part is used to improve the airflow direction of the high-pressure gas released by the electronic igniter of the excitation fuse; the outer side surface of the sealing part is provided with a sealing structure, and the sealing structure is used to seal the gap between the piston structure and the contact surface of the excitation fuse shell; the impact part is used to cut off the conductive part on the excitation fuse.

[0007] Preferably, the outer diameter of the sleeve portion is smaller than or equal to the outer diameter of the sealing portion.

[0008] Preferably, the sealing structure is one of the following structures:

[0009] The sealing part is in a truncated cone structure to form the sealing structure, one end of the sealing part is fixedly connected to the impact part, the sleeve part is fixedly arranged on the table of the truncated cone structure of the sealing part, the outer diameter of the sleeve part is smaller than the maximum outer diameter of the sealing part, and the outer diameter of one end of the sealing part connected to the sleeve part is larger than the outer diameter of the other end connected to the impact part; or,

[0010] The sealing structure is formed by a lip-tongue structure which is arranged on the sealing part and extends in a direction away from the impact part and is inclined outward on the outer periphery of the end face of the sleeve part; one end of the sealing part is fixedly connected to the impact part, and the end face of the other end of the sealing part is connected to the sleeve part; the outer diameter of the end of the sealing part connected to the impact part is smaller than the outer diameter of the end of the sealing part connected to the sleeve; or,

[0011] At least one circle of ridges is arranged along the circumferential direction on the outer side surface of the sealing portion to form the sealing structure; or,

[0012] At least one circle of grooves is circumferentially arranged on the outer side surface of the sealing portion, and a sealing member is arranged in the groove to form the sealing structure.

[0013] Preferably, when the sealing structure is a lip and tongue structure, the sleeve portion is arranged at the end surface edge of the sealing portion, and the sleeve portion is integrally connected with the lip and tongue structure; the maximum outer diameter of the sleeve portion is equal to the outer diameter of the sealing portion.

[0014] Preferably, the open end of the sleeve portion is a sawtooth structure.

[0015] Preferably, a chamfer inclined toward the center of the sleeve portion is provided on the opening end of the sleeve portion.

[0016] Preferably, the impact part includes a blade body and a blade edge, the blade body and the end surface of the sealing part are integrally formed, and the sealing part and the blade body part have a T-shaped structure; the blade edge is integrally formed on the end surface of the blade body away from the sealing part.

[0017] Preferably, a notch is provided in the length direction of the end surface of the blade body away from the sealing portion, and a convex ridge penetrating the length of the bottom of the notch is provided at the bottom of the notch to form the blade.

[0018] Preferably, a side of the convex edge facing the opening end of the notch is an inclined surface, a plane or a V-shaped structure.

[0019] Preferably, limiting protrusions for limiting the initial position of the piston are respectively arranged on the two outer side surfaces of the blade in the length direction and close to the blade.

[0020] The present invention also provides an excitation fuse, comprising the above-mentioned piston structure. In an initial state, the open end of the sleeve portion of the piston structure contacts the electronic ignition tube of the excitation fuse.

[0021] Preferably, the chamfer provided on the open end of the sleeve portion matches the inclined surface on the electronic ignition tube.

[0022] The piston structure and excitation fuse of the present invention can improve the movement direction of the high-pressure gas through the sleeve part, thereby improving the power of the piston, and can restrict the opening state of the detonation end of the electronic igniter, playing the role of absorbing energy to protect the excitation fuse shell. When the sleeve part completely wraps the high-pressure gas release end of the electronic igniter, the outer side surface of the release end of the electronic igniter can be interference-fitted with the inner wall of the sleeve part, serving as a redundant constraint on the vertical displacement of the electronic igniter.

[0023] The sealing structure is integrally formed on the piston body, so no additional sealing parts are required, thereby reducing the number of parts and assembly processes.

[0024] A notch is provided at the impact part of the piston. When the piston disconnects the conductive part, the notch can be arranged across the width of the conductive part. When the conductive part is cut off, the conductive part is accommodated in the notch to avoid the conductive part being offset during cutting and causing force dispersion. A convex ridge is provided in the notch as a cutting edge. Since the convex ridge has a small area, the impact force can be more concentrated when cutting the conductive part, making it easier to cut the conductive part. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the matching structure of the electronic igniter and the piston, where: Figure 1 a is the electronic igniter located outside the opening end of the sleeve. Figure 1b is the sleeve part that half-wraps the high-pressure gas release end of the electronic igniter. Figure 1 c is the sleeve part which completely wraps the high pressure gas release end of the electronic igniter.

[0026] Figure 2a It is a schematic diagram of a piston structure in which the opening end of the sleeve portion is a serrated structure.

[0027] Figure 2b It is a schematic diagram of the piston structure in which the open end of the sleeve portion is a complete structure.

[0028] Figure 3 It is a schematic diagram of the structure of the integrally formed sealing structure on the piston, wherein: Figure 3 a is the lip and tongue structure, Figure 3 b is the sealing ridge structure, Figure 3 c Cone-shaped table structure.

[0029] Figure 4 It is a structural schematic diagram of a sealing structure separately provided on a piston.

[0030] Figure 5 This is a schematic diagram of a structure in which a notch is provided in the impact part of the piston.

[0031] Figure 6 yes Figure 5 Schematic diagram of the convex ridge structure, wherein, Figure 6 The convex edge of a is a bevel structure. Figure 6 The ridge of b is a V-shaped structure. Figure 6 The ridges of c are planar structures.

[0032] Figure 7 It is a schematic diagram showing that the blade of the impact portion of the piston is a planar structure.

[0033] Figure 8 This is a structural diagram of the piston when used in an excitation fuse.

[0034] Marking Description:

[0035] Piston 1, sleeve part 11, vertical ridge 110, groove 111, sealing part 12, lip and tongue structure 121, sealing ridge 122, frustum structure 123, seal 124, impact part 13, blade 131, blade 132, notch 1321, boss structure 1322, ridge 1323, limiting bump 1324, electronic igniter 2, high pressure gas release end 21, excitation fuse housing 3. DETAILED DESCRIPTION

[0036] The piston structure for an excitation fuse of the present invention comprises a sleeve portion, a sealing portion and an impact portion which are integrally formed and connected in sequence; the sleeve portion is provided at one end of the sealing portion, and the impact portion is provided at the other end; the sleeve portion is used to improve the airflow direction of the high-pressure gas released by the electronic igniter of the excitation fuse; the outer side surface of the sealing portion is provided with a sealing structure, and the sealing structure is used to seal the gap between the piston structure and the contact surface of the excitation fuse shell; the impact portion is used to cut off the conductive part on the excitation fuse.

[0037] Below, preferred embodiments are given and described in detail with reference to the drawings.

[0038] See also Figure 1 The piston 1 is made of insulating material and consists of three parts: a sleeve part 11, a sealing part 12, and an impact part 13. The sleeve part 11, the sealing part 12 and the impact part 13 are integrally formed. The sleeve part 11 and the impact part 13 are respectively located at opposite ends of the sealing part 12. The outer diameter of the sleeve part 11 is less than or equal to the maximum outer diameter of the sealing part 12, and the sleeve part 11 is located in the central area of ​​the sealing part 12 to ensure that when the electronic igniter 2 initially releases the high-pressure gas, the exploded high-pressure gas first acts on the central area of ​​the piston to ensure that the piston can be smoothly displaced. The outer diameter of the end of the sealing part connected to the impact part is smaller than the outer diameter of the end of the sealing part connected to the sleeve.

[0039] The sleeve portion 11 is a hollow annular structure. When the piston is used in the excitation fuse, the opening end of the sleeve portion 11 is arranged toward the high-pressure gas release end of the electronic igniter 2. The height of the sleeve portion 11 is determined by the relationship between the high-pressure gas release end 21 of the electronic igniter 2 of the excitation fuse and the sleeve portion 11. Figure 1 a. When the high-pressure gas release end 21 of the electronic igniter 2 is located outside the open end of the sleeve part 11, the height of the sleeve part 11 is very small, and the high-pressure gas released by the electronic igniter 2 can immediately act on the entire end surface of the sealing part of the piston. For electronic igniters of the same specification, the driving force in this case is relatively small. When the high-pressure gas release end 21 of the electronic igniter 2 is located in the sleeve part 11, but the sleeve part 11 does not contact the electronic igniter 2, the sleeve part 11 half-wraps the high-pressure gas release end of the electronic igniter, see Figure 1 b. In this case, the direction of the high-pressure gas flow can be improved by adjusting the position of the high-pressure gas release end of the electronic igniter in the sleeve portion 11. When the high-pressure gas release end 21 of the electronic igniter 2 is located in the sleeve portion 11, the sleeve portion 11 contacts the electronic igniter 2 to form a sleeve portion 11 that fully wraps the high-pressure gas release end of the electronic igniter. Figure 1c. The end surface of the open end of the sleeve portion 11 is in contact with the electronic igniter 2 to support the electronic igniter 2. A circle of vertical ridges 110 is formed on the periphery of the end surface of the sealing portion 12 where the sleeve portion 11 is located, or the vertical ridges 110 may not be provided.

[0040] The sleeve part can improve the airflow direction of the high-pressure gas released by the electronic igniter, thereby improving the power of the piston, and can restrict the opening of the ignition end of the electronic igniter, playing the role of absorbing energy to protect the excitation fuse shell. Figure 1 c structural relationship, it also plays the role of supporting the electronic igniter.

[0041] When the high-pressure gas release end of the electronic igniter 2 is located outside the sleeve part 11, when the high-pressure gas released by the electronic igniter 2 is initially released, the volume between the electronic igniter 2 and the end face of the sealing part 12 is the largest, and the pressure of the high-pressure gas is instantly reduced the most after the release. In addition, the high-pressure gas acts on the end face of the sealing part 12 of the entire piston, and the force relative to the piston is also the smallest.

[0042] When the sleeve part 11 half-wraps or fully wraps one end of the high-pressure gas release of the electronic igniter 2, the high-pressure gas released by the electronic igniter 2 can all act on the end face of the sealing part 12 in the sleeve part 11, reducing the spatial volume after the high-pressure gas is released, reducing the force-bearing area, increasing the force on the piston, and improving the kinetic energy of the piston; at the same time, due to the existence of the sleeve part 11, when the high-pressure gas released by the electronic igniter 2 first impacts the sleeve part 11, a part of the impact energy can be absorbed by the sleeve part 11, which plays a certain protective role on the shell of the excitation fuse.

[0043] When the sleeve portion 11 completely wraps around the high-pressure gas release end of the electronic igniter, the sleeve portion supports the electronic igniter and can serve as a redundant constraint on the vertical displacement of the electronic igniter.

[0044] When the sleeve portion 11 is half-wrapped to release the high pressure gas of the electronic igniter 2, the end wall of the open end of the sleeve portion 11 is set to a sawtooth structure, see Figure 2a That is, grooves 111 are arranged at intervals on the end wall of the opening of the sleeve part 11. When the electronic igniter 2 releases high-pressure gas, a part of the high-pressure gas can escape from the outside of the sleeve part 11 from the grooves 111, and then act on the end surface of the sealing part 12 on the outer peripheral side of the sleeve part 11.

[0045] When the sleeve portion 11 fully encloses the high pressure gas release end of the electronic igniter 2, see Figure 2b The sleeve portion 11 is a complete structure, and no groove or the like is provided on the end wall to allow the high pressure gas to escape from the sleeve portion.

[0046] The outer side of the sealing part 12 generally matches the inner wall of the chamber accommodating the piston in the excitation fuse housing. A sealing structure is provided on the outer side of the sealing part 12. The sealing structure can be in various structural forms. Figure 3 The sealing portion 12 is integrally formed with a sealing structure (see Figure 3 a. Figure 3 b), or, by changing the sealing portion 12 itself to form a sealing structure (see Figure 3 c).

[0047] See also Figure 3 a. The outer periphery of the end face of the sleeve part 11 is provided on the sealing part 12, extending toward the electronic igniter side in the direction where the sleeve part 11 protrudes from the sealing part 12 and tilting outward to form a lip-and-tongue structure 121, and the lip-and-tongue structure 121 protrudes from the outer side of the sealing part 12. When the piston 1 is installed in the housing of the electronic igniter fuse, the lip-and-tongue structure 121 is interference-fitted with the inner wall of the excitation fuse housing, and the lip-and-tongue structure 121 is squeezed by the inner wall of the housing to produce elastic deformation, thereby achieving the seal between the piston and the electronic igniter housing. In other embodiments, the sleeve part 11 is provided around the edge of the end face of the sealing part 12, and the sleeve part 11 is integrally connected with the lip-and-tongue structure at the edge of the end face of the sealing part 12. At this time, the lip-and-tongue structure serves as a part of the sealing part 12. In this case, the outer diameter of the sleeve part is equal to the maximum outer diameter of the sealing part, that is, the maximum outer diameter at the lip-and-tongue structure. When the piston is used, the lip and tongue structure at the connection between the sleeve part 11 and the sealing part 12 is squeezed by the inner wall of the shell of the electronic igniter fuse and elastically deforms, thereby achieving sealing between the piston and the shell of the electronic igniter.

[0048] See also Figure 3 b. On the outer surface of the sealing portion 12, at least one circle of sealing ridges 122 are arranged at intervals along the circumferential direction to form a sealing structure. When the piston 1 is installed in the excitation fuse housing, the sealing ridges 122 are interference-fitted with the inner wall of the housing to form a sealing structure, thereby achieving sealing between the piston and the inner wall of the excitation fuse housing.

[0049] See also Figure 3 c. The outer shape of the sealing part 12 is a truncated cone structure 123, and the outer diameter of the end of the sealing part 12 connected to the sleeve part is larger than the outer diameter of the end of the sealing part 12 connected to the impact part. When the piston 1 is installed in the excitation fuse housing, the end with a larger outer diameter of the truncated cone structure 123 of the sealing part 12 forms an interference fit with the inner wall of the excitation fuse housing to form a sealing structure, thereby achieving a seal between the piston and the inner wall of the excitation fuse housing, and the end with a smaller outer diameter forms a tight fit or a small gap fit with the inner wall of the excitation fuse housing.

[0050] See also Figure 4The sealing structure of the sealing part 12 can also be an independent sealing member. A circle of annular grooves is provided on the outer side surface of the sealing part 12 in the circumferential direction, and a circle of sealing members 124 is arranged in the annular groove. The sealing members 124 protrude from the outer side surface of the sealing part 12 to form a sealing structure. The sealing member can be an elastic sealing ring. When the piston 1 is installed in the excitation fuse housing, the sealing member 124 of the sealing part 12 is interference fit with the inner wall of the excitation fuse housing, and the sealing member 124 is squeezed to produce elastic deformation, thereby achieving sealing between the piston and the inner wall of the excitation fuse housing.

[0051] Impact part 13, see Figure 5 , including a blade body 131 and a blade 132. The blade body 131 is integrally formed with the end face of the sealing portion 12, and the blade 132 is integrally formed on the end face of the blade body 131 away from the sealing portion 12. The sealing portion 12 and the blade body 131 are in a T-shaped structure, that is, the thickness of the blade body 131 is less than the outer diameter of the end where the sealing portion 12 is connected to the impact portion. In order to save materials, reduce costs and piston weight, the thickness of the blade body 131 is sufficient to not break after cutting the conductive part. The length of the blade body 131 is greater than the width of the conductive part of the excitation fuse. The length of the blade 132 is greater than the width of the conductive part of the excitation fuse, so that the blade 132 can disconnect the conductive part from the width direction of the conductive part.

[0052] A notch 1321 is provided in the length direction of the end face of the blade 131 away from the sealing portion 12, and passes through the thickness of the blade 131. The length of the notch 1321 is slightly larger than the width of the conductive member of the excitation fuse. Boss structures 1322 are formed at the ends of the blade 131 on both sides of the length direction of the notch 1321. A ridge 1323 is provided at the bottom of the notch 1321 along the length direction of the blade as the blade 132, which is used to cut the conductive member. The ridge 1323 can be in various structural forms, see Figure 6 a, the ridge 1323 is a slope structure, see Figure 6 b, the ridge 1323 is a V-shaped structure, see Figure 6 c. The ridge 1323 is a planar structure. The blade is set as a ridge structure to reduce the effective area and make the stress more concentrated.

[0053] Limiting protrusions 1324 are respectively arranged on the two outer sides of the blade body 131 along the length direction of the blade body and near the blade edge. When the piston 1 is installed, the limiting protrusions 1324 can cooperate with the excitation fuse housing to fix the initial position of the piston 1. When the piston is impacted, the piston 1 will be disconnected from the limiting protrusions 1324, and then the conductive member will be displaced and cut off.

[0054] In other embodiments, see Figure 7The end face of the blade 131 away from the sealing portion 12 is a planar structure without a notch. The end face of the planar structure is the blade 132. The thickness and length of the blade 132 can be the same as or less than the thickness and length of the blade.

[0055] See also Figure 8 When the piston 1 is used in the excitation fuse, the electronic igniter 2 and the piston 1 are sequentially arranged in the cavity of the excitation fuse housing 3. The electronic igniter 2 is fixedly arranged in the excitation fuse housing 3, and the signal receiving end of the electronic igniter 2 can be connected to the outside of the excitation fuse housing 3. The opening end of the sleeve part of the piston 1 is provided with a chamfer inclined toward the center direction of the sleeve part. When the sleeve part 11 of the piston 1 contacts the electronic igniter 2, the chamfer of the opening end of the sleeve part of the piston 1 contacts the inclined surface of the electronic igniter 2, supporting the formation of the electronic igniter 2, and forming a full-wrapped state through the excitation fuse housing and the sleeve part of the piston, forming a full-directional limit on the electronic ignition tube, preventing the product from being unreliable due to external shaking during use; at the same time, the full-wrapped state also improves the airflow direction after the ignition tube is actuated. A gap is reserved between the end face of the sealing part of the piston 1 and the high-pressure gas release end of the electronic igniter 2. The high-pressure gas release end 21 of the electronic igniter 2 is fully wrapped by the sleeve part 11, so that the high-pressure gas released by the electronic igniter 2 is located in the sleeve part, ensuring that the released high-pressure gas maintains a certain high pressure, providing sufficient driving force for the piston 1, thereby improving the utilization rate of the high-pressure gas. The sealing structure is a lip-tongue structure. When the piston 1 is installed in the excitation fuse housing 3, the lip-tongue structure is elastically deformed by extrusion, forming an interference fit with the inner wall of the excitation fuse housing 3, and sealing the contact gap between the excitation fuse housing 3 and the piston 1.

Claims

1. A piston structure for an excitation fuse, characterized in that: The piston structure includes a sleeve part, a sealing part and an impact part which are integrally formed and connected in sequence; the sleeve part is arranged at one end of the sealing part, and the impact part is arranged at the other end; the sleeve part is used to improve the airflow direction of the high-pressure gas released by the electronic igniter of the excitation fuse; the outer side surface of the sealing part is provided with a sealing structure, and the sealing structure is used to seal the gap between the piston structure and the contact surface of the excitation fuse shell; the impact part is used to cut off the conductive part on the excitation fuse.

2. The piston structure for an excitation fuse according to claim 1, characterized in that: An outer diameter of the sleeve portion is smaller than or equal to an outer diameter of the sealing portion.

3. The piston structure for an excitation fuse according to claim 1, characterized in that: The sealing structure is one of the following structures: The sealing part is in a truncated cone structure to form the sealing structure, one end of the sealing part is fixedly connected to the impact part, the sleeve part is fixedly arranged on the table of the truncated cone structure of the sealing part, the outer diameter of the sleeve part is smaller than the maximum outer diameter of the sealing part, and the outer diameter of one end of the sealing part connected to the sleeve part is larger than the outer diameter of the other end connected to the impact part; or, The sealing structure is formed by a lip-tongue structure which is arranged on the sealing part and extends in a direction away from the impact part and is inclined outward on the outer periphery of the end face of the sleeve part; one end of the sealing part is fixedly connected to the impact part, and the end face of the other end of the sealing part is connected to the sleeve part; the outer diameter of the end of the sealing part connected to the impact part is smaller than the outer diameter of the end of the sealing part connected to the sleeve; or, At least one circle of ridges is arranged along the circumferential direction on the outer side surface of the sealing portion to form the sealing structure; or, At least one circle of grooves is circumferentially arranged on the outer side surface of the sealing portion, and a sealing member is arranged in the groove to form the sealing structure.

4. The piston structure for an excitation fuse according to claim 3, characterized in that: When the sealing structure is a lip-and-tongue structure, the sleeve portion is arranged at the end surface edge of the sealing portion, and the sleeve portion is integrally connected with the lip-and-tongue structure; the maximum outer diameter of the sleeve portion is equal to the outer diameter of the sealing portion.

5. The piston structure for an excitation fuse according to claim 1, characterized in that: The opening end of the sleeve part is a sawtooth structure.

6. The piston structure for an excitation fuse according to claim 1, characterized in that: The opening end of the sleeve portion is provided with a chamfer inclined toward the center direction of the sleeve portion.

7. The piston structure for an excitation fuse according to any one of claims 1 to 6, characterized in that: The impact part includes a blade body and a blade edge, the blade body and the end surface of the sealing part are integrally formed, and the sealing part and the blade body part have a T-shaped structure; the blade edge is integrally formed on the end surface of the blade body away from the sealing part.

8. The piston structure for an excitation fuse according to claim 7, characterized in that: A notch is provided in the length direction of the end surface of the blade body away from the sealing portion, and a convex ridge penetrating the length of the bottom of the notch is provided at the bottom of the notch to form the blade.

9. The piston structure for an excitation fuse according to claim 8, characterized in that: The side of the convex edge facing the opening end of the notch is an inclined surface, a plane or a V-shaped structure.

10. The piston structure for an excitation fuse according to claim 9, characterized in that: Limiting protrusions for limiting the initial position of the piston are respectively arranged on the two outer side surfaces of the blade in the length direction and close to the blade.

11. An excitation fuse, characterized in that: The piston structure according to any one of claims 1 to 10, wherein in an initial state, an open end of a sleeve portion of the piston structure contacts an electronic ignition tube of the excitation fuse.

12. The excitation fuse according to claim 11, characterized in that: The chamfer arranged on the open end of the sleeve portion matches the inclined surface on the electronic ignition tube.

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