Pyrotechnic cutout

Abstract

The utility model relates to pyrotechnic cutout technical field, especially a pyrotechnic cutout. The pyrotechnic cutout includes casing, drive arrangement, melt and cut structure, the inside of casing forms the stroke cavity, the movable cavity and at least one arc extinguishing cavity that are linked together, at least part of melt is located in arc extinguishing cavity and is worn and is equipped with movable cavity, cut structure passes through stroke cavity under the push of drive arrangement, moves to the terminal point in movable cavity, the casing extends to arc extinguishing cavity and forms at least one locating post, and locating post is equipped with cut structure outside, and melt has at least one set of locating through hole, and locating through hole is located in arc extinguishing cavity, locating through hole is sleeved on locating post, and is used for transverse pull cut melt in the movement process of cut structure. Through above setting, can effectively improve the breaking capacity and arc extinguishing capacity of pyrotechnic cutout.

Description

Technical Field

[0001] This utility model relates to the field of circuit protection technology, and in particular to a smoke cut-off device. Background Technology

[0002] While pyrotechnic fuses are widely used in circuit protection, their working principle primarily involves using a gas generator to produce thrust and push a piston structure to cut off the main circuit electrodes, thus achieving protection. However, they still have shortcomings in certain performance parameters. Especially in fields such as new energy vehicles and energy storage systems, the requirements for circuit protection equipment are increasingly stringent due to the rapid development of power electronics technology.

[0003] Currently, existing pyrotechnic fuses still utilize parallel fusible elements to achieve breaking under high current and high voltage conditions. However, the generation of an electric arc is unavoidable during the melting process of the fusible element, especially under high current and high voltage conditions. The traditional method of filling the arc-extinguishing cavity with an arc-extinguishing medium cannot guarantee that the break point is accurately located in the arc-extinguishing cavity, resulting in insufficient arc-extinguishing capability. Utility Model Content

[0004] This invention provides a piston structure and a pyrotechnic cutter, which can solve at least one problem in the background art to optimize the design and improve the performance of the pyrotechnic cutter.

[0005] This utility model provides a fireworks cutter, including: a housing, a driving device, a molten element, and a cutting structure;

[0006] The shell has a connected travel cavity, a movable cavity, and at least one arc-extinguishing cavity inside; at least a portion of the molten material is located in the arc-extinguishing cavity and passes through the movable cavity; the cutting structure passes through the travel cavity under the push of the driving device and moves to the endpoint in the movable cavity;

[0007] The shell extends into the arc-extinguishing cavity to form at least one positioning post. The positioning post is located on the outside of the cutting structure. The melt has at least one set of positioning through holes, which are located in the arc-extinguishing cavity. The positioning through holes are sleeved on the positioning post and are used to laterally pull the melt apart during the movement of the cutting structure.

[0008] In some embodiments, the positioning post has a conical column structure; the positioning through hole is elongated, and the positioning post abuts against the side wall of the positioning through hole away from the cutting structure.

[0009] In some embodiments, the melt has a plurality of weak sections spaced apart, the weak sections including positioning through holes and melting weak sections, both of which are located in the arc extinguishing cavity.

[0010] In some embodiments, the housing has at least one isolation baffle extending into the arc-extinguishing cavity; the weak section of the fusion break includes a plurality of first pre-fusion break holes near the end of the isolation baffle and a plurality of second pre-fusion break holes away from the end of the isolation baffle; the transverse cross-sectional area along the width direction between adjacent first pre-fusion break holes is smaller than the transverse cross-sectional area along the width direction between adjacent second pre-fusion break holes.

[0011] In some embodiments, a main circuit electrode is further included, the melt is connected in parallel with the main circuit electrode, and the main circuit electrode is provided with at least one weak break section; the cutting structure includes a piston structure and a melt pusher, the driving device drives the piston structure to cut off the weak break section of the main circuit electrode to form a fracture; the melt pusher drives the melt to move; a reinforcing structure is provided in the housing, the reinforcing structure includes at least one of an inner plate, an inner sleeve, and a pressure plate embedded in the housing.

[0012] In some embodiments, the positioning through hole has an outward protrusion in the middle.

[0013] In some embodiments, the melt pusher includes a support extending axially toward the piston structure and a fixing portion connected to the support, the fixing portion having at least one protrusion on the side facing the melt, and the melt also having a slot located in the movable cavity and cooperating with the protrusion; the protrusion is sleeved in the slot.

[0014] In some embodiments, a slit is provided between the fixing part and the movable cavity, the width of which is less than or equal to 2.5 times the thickness of the melt.

[0015] In some embodiments, the bottom of the active cavity is provided with a limiting structure, the protruding ridges on both sides of the bottom of the melt pusher overlap the limiting structure, and the depth of the active cavity is at least 3.0 mm.

[0016] In some embodiments, the piston structure includes a first part and a second part connected to the first part. The first part is a columnar structure extending axially and has a non-circular radial cross-sectional shape. The first part has a groove on its end face away from the second part for receiving gas impact, and the axial extension direction of the groove is consistent with the axial direction of the first part. The second part has a piston cutter formed at its end away from the first part, and the end face of the piston cutter has a convex structure.

[0017] The pyrotechnic cutter provided by this utility model has a design that connects the positioning post in the arc-extinguishing chamber with the positioning through hole of the molten material. This design allows the cutting structure to apply a lateral tensile force to the molten material during movement under the fixing action of the positioning post and the molten material, so as to accurately ensure that the cut of the molten material is located in the arc-extinguishing chamber, thereby significantly improving the cutting ability and arc-extinguishing ability of the pyrotechnic cutter.

[0018] Other features and beneficial effects of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing this invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 An exploded perspective view of a fireworks cutter provided in an embodiment of this utility model;

[0021] Figure 2 A 3D view of the main circuit electrodes;

[0022] Figure 3 A three-dimensional view of the melt pusher;

[0023] Figure 4 A cross-sectional view of a pyrotechnic cutter provided in an embodiment of this utility model;

[0024] Figure 5 for Figure 4 A magnified view of part A in the image;

[0025] Figure 6 This is a partial cross-sectional view of a fireworks cutter provided in an embodiment of the present invention;

[0026] Figure 7 A partial bottom perspective view of a fireworks cutter provided in an embodiment of this utility model;

[0027] Figure 8 A partial exploded perspective view of a fireworks cutter provided in an embodiment of this utility model;

[0028] Figure 9 A three-dimensional view of the melt;

[0029] Figure 10 A three-dimensional diagram of the piston structure;

[0030] Figure 11This is a front view of the piston structure;

[0031] Figure 12 This is a top view of the piston structure.

[0032] Figure label:

[0033] 10. Piston structure; 11. First part; 11a. Sealing groove; 12. Second part; 12a. Piston cutter; 12b. Support leg; 12c. Limiting block; 12d. Boss; 12f. Reinforcing rib; 13. Groove; 20. Shell; 20a. Stroke cavity; 20b. Moving cavity; 201b. Slit; 201c. Limiting part; 20c. Arc extinguishing cavity; 201c. First region; 202c. Second region; 20d. First gap; 20e. Second gap; 20f. Positioning post; 21. Upper shell; 22. Middle shell; 23. Cover shell; 24. Lower shell; 2 5. Isolation baffle; 26. Inner sleeve; 27. Inner plate; 28. Pressure plate; 30. Drive device; 40. Main circuit electrode; 40a. Disconnect weak section; 40b. Limiting hole; 40c. Limiting protrusion; 22a. Limiting support; 40c. Sealing structure; 50. Melt; 50a. Melt-breaking weak section; 501a. First pre-melting through hole; 502a. Second pre-melting through hole; 50b. Positioning through hole; 501b. Outer protrusion; 50c. Slot; 60. Sealing element; 70. Melt pushing element; 71. Support; 72. Fixing part; 73. Protruding column; 74. Protruding ridge. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The technical features designed in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0035] In the description of this utility model, it should be noted that all terms used in this utility model (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains, and should not be construed as limiting this utility model; it should be further understood that the terms used in this utility model should be understood to have the same meaning as those in the context of this specification and in the relevant field, and should not be understood in an idealized or overly formal sense, except as expressly defined in this utility model.

[0036] Example 1

[0037] Please see Figure 1 , Figure 4 This utility model provides a firework cutter, which includes at least: a housing 20, a driving device 30, a molten element 50, and a cutting structure.

[0038] The housing 20 may be made of a high-strength, pressure-resistant insulating material. Preferably, the housing 20 includes an upper housing 21, a middle housing 22, a cover housing 23, and a lower housing 24 that are detachably connected in sequence. The upper housing 21 and the middle housing 22 enclose each other, forming a travel cavity 20a inside. The cover housing 23 and the lower housing 24 enclose each other, forming a movable cavity 20b and an arc-extinguishing cavity 20c inside. The movable cavity 20b and the arc-extinguishing cavity 20c are provided with sealing components to prevent the arc-extinguishing medium from overflowing. The travel cavity 20a and the movable cavity 20b are connected. Preferably, the upper housing 21 and the middle housing 22, the middle housing 22 and the cover housing 23, and the cover housing 23 and the lower housing 24 can be aligned and fitted by corresponding limiting protrusions 40c or limiting grooves to facilitate assembly. Further, the housing 20 is provided with a reinforcing structure, which includes at least one of an inner plate 26, an inner sleeve 26, and a pressure plate 27 embedded in the housing 20. The reinforcing structure is preferably made of metal to enhance the strength of the shell 20 and effectively reduce the impact of high-pressure gas on the shell 20.

[0039] At least a portion of the melt 50 is located within the arc-extinguishing cavity 20c and passes through the movable cavity 20b; in this embodiment, the cutting structure passes through the stroke cavity 20a under the push of the driving device 30 and moves to the endpoint in the movable cavity 20b.

[0040] Further, please refer to Figure 6 , Figure 7 The housing 20 further includes at least one positioning post 20f extending into the arc-extinguishing cavity 20c. The positioning post 20f is located in the arc-extinguishing cavity 20c outside the cutting structure. In this case, a set of positioning posts 20f is provided on each side of the melt 50. The melt 50 has at least one set of positioning through holes 50b, which are located in the arc-extinguishing cavity 20c. The positioning through holes 50b are sleeved on the positioning posts 20f and are used to laterally pull the melt 50 apart during the movement of the cutting structure. Preferably, the positioning post 20f abuts against the side wall of the positioning through hole 50b away from the cutting structure, thereby ensuring that the fracture of the melt 50 is formed in the arc-extinguishing cavity 20c outside the movable cavity 20b. The positioning post 20f has a conical columnar structure, and the positioning through hole 50b is elongated.

[0041] In this embodiment, the positioning post 20f of the housing 20 and the positioning through hole 50b of the melt 50 cooperate to enable the cutting structure to apply a lateral pulling force to the melt 50 under the fixing action of the positioning post 20f and the melt 50 during the movement, which can ensure that the cutting is performed at the predetermined position (i.e., at the positioning through hole 50b in the arc extinguishing chamber 20c), which can significantly improve the cutting ability and arc extinguishing ability of the pyrotechnic cutter.

[0042] In practice, the positioning post 20f, which has a conical column structure, is positioned at the end of the positioning through hole 50b away from the melt pusher 70. This arrangement also results in a relatively large contact area between the positioning post 20f and the positioning through hole 50b, which helps to disperse the stress generated during the cutting process, prevents displacement or deformation of the melt 50 due to stress concentration during the cutting impact, and improves the stability and accuracy of the cutting process.

[0043] Meanwhile, the positioning post 20f of the conical column structure has a gradually changing shape along its axis, and its cross-section is adapted to the positioning through hole 50b. This can better guide the melt 50 into the predetermined position and achieve precise positioning. Moreover, its stable support can prevent the melt 50 from shaking or shifting before cutting. In addition, it helps to maintain the stable combustion of the electric arc during the cutting process, accelerates the cooling of the electric arc and energy dissipation, thereby improving the cutting effect.

[0044] Furthermore, the pyrotechnic cutter also includes a main circuit electrode 40, with the molten material 50 connected in parallel to the main circuit electrode 40. The main circuit electrode 40 is provided with at least one weak break section 40a. The cutting structure includes a piston structure 10 and a molten material pusher 70. The driving device 30 drives the piston structure 10 to cut off the weak break section 40a of the main circuit electrode 40 to form a break; the molten material pusher 70 drives the molten material 50 to move.

[0045] In this embodiment, the piston structure 10 moves in the stroke cavity 20a under the drive of the drive device 30 to disconnect the main circuit electrode 40.

[0046] In specific implementation, the axial direction of the stroke cavity 20a is consistent with the axial direction of the piston structure 10, and its cavity shape should be adapted to accommodate the piston structure 10. For example, if the maximum radial cross-section of the piston structure 10 is elliptical, then the radial cross-section of the stroke cavity 20a is also elliptical, and the sealing element 60 is provided at the contact position between the stroke cavity 20a and the piston structure 10 to prevent gas leakage. In this embodiment, the radial cross-sectional shape of the stroke cavity 20a includes, but is not limited to, an elliptical, racetrack-shaped, or composite circular arc shape.

[0047] Preferably, when the radial cross-sectional shape of the stroke cavity 20a is elliptical, the average wall thickness of the housing 20 along the major axis of the radial cross-section of the stroke cavity 20a is greater than the average wall thickness of the housing 20 along the minor axis of the radial cross-section of the stroke cavity 20a. For example, if the major axis dimension W1 of the piston structure 10 is 24mm and the minor axis dimension W2 is 16mm, then the wall thickness of the stroke cavity 20a along the major axis of the radial cross-section of the housing 20a can be designed to be 7mm, and the wall thickness of the stroke cavity 20a along the minor axis of the radial cross-section of the housing 20a can be designed to be 3mm. Compared with the traditional circular stroke cavity, this wall thickness limitation design can effectively achieve miniaturization and improve space utilization while ensuring structural strength.

[0048] The main circuit electrode 40 is inserted into the stroke cavity 20a of the housing 20, and the piston structure 10 is located in the stroke cavity 20a and on one side of the main circuit electrode 40. When the driving device 30 generates high-pressure gas, the piston structure 10 moves in the stroke cavity 20a to break the main circuit electrode 40, so that the main circuit electrode 40 forms at least one break.

[0049] In this embodiment, the preferred driving device 30 is an electric starter connected to an external circuit. When the electric starter is triggered, it generates instantaneous high-pressure gas through a chemical reaction inside. The high-pressure gas first fills the groove 13 of the piston structure 10 so that the energy is concentrated in the groove 13 rather than acting directly on the entire surface, thereby driving the piston structure 10 to move at a high speed. At the same time, the gas energy can be smoothly guided to the end face of the piston structure 10 facing the driving device 30 through the groove 13 design. This guiding effect allows the gas energy to be more effectively converted into the kinetic energy of the piston structure 10, rather than generating turbulence or energy dissipation inside the piston. This allows the piston structure 10 to move at high speed in the stroke cavity 20a to break the main circuit electrode 40, so that the main circuit electrode 40 forms at least one break, thereby cutting off the current flow in the main circuit circuit and effectively realizing the circuit protection function.

[0050] Optionally, please refer to Figure 2The main circuit electrode 40 is provided with at least one weak break section 40a. The driving device 30 drives the piston structure 10 to cut off the weak break section 40a of the main circuit electrode 40 to form a fracture. The structure of the weak break section 40a includes, but is not limited to, notches, through holes, and local thinning structures on the main circuit electrode 40, which are narrow-aperture designs with a reduced cross-sectional area along the width direction compared to other positions. The weak break section 40a is located on the main circuit electrode 40 within the stroke cavity 20a and is directly opposite the piston cutter 12a of the piston structure 10, so that when the piston structure 10 moves at high speed to the main circuit electrode 40, the piston cutter 12a can quickly cut off the weak break section 40a. In this embodiment, the weak break section 40a preferably includes a strip-shaped inverted V-shaped notch located in the middle and along the width direction of the main circuit electrode 40, and an elongated through hole located in the middle and along the length direction of the main circuit electrode 40. This design is more conducive to the main circuit electrode 40 bearing force, facilitating rapid cutting.

[0051] Furthermore, to effectively prevent the main circuit electrode 40 from shifting or tilting after being cut, thus affecting the overall structure, in this embodiment, the main circuit electrode 40 has a limiting structure that is limited and connected to the housing 20. The limiting structure can be at least one of one or more limiting holes 40b, limiting protrusions 40c, or limiting grooves. When the limiting structure is a limiting hole 40b, the limiting hole 40b is located inside the main circuit electrode 40, and the housing 20 extends a limiting support 22a. The limiting hole 40b of the main circuit electrode 40 is sleeved on the limiting support 22a to effectively achieve horizontal radial limiting. When the limiting structure is a limiting protrusion 40c or a limiting groove (not shown in the figure), the limiting protrusion 40c or the limiting groove is located on the side of the main circuit electrode 40. Similarly, the housing 20 has a matching limiting groove or limiting protrusion 40c located near the side of the main circuit electrode 40. The cooperation of these two structures effectively achieves horizontal radial limiting.

[0052] Optionally, the main circuit electrode 40 is provided with a sealing structure 40c on the sides of the opposite ends of the travel cavity 20a to prevent external moisture or impurities or internal air pressure from entering or leaving the opposite ends of the main circuit electrode 40 and affecting its function.

[0053] Please continue reading. Figure 4The melt pusher 70 is located in the movable cavity 20b; the melt 50 is connected in parallel with the main circuit electrode 40, and at least a portion of the melt 50 is located in the arc-extinguishing cavity 20c and passes through the movable cavity 20b; the support 71 of the melt pusher 70, driven by the support leg 12b of the piston structure 10, moves the melt 50 in the movable cavity 20b. When the melt 50 moves downward, the positioning pin 20f located at the positioning through hole 50b applies a force in the opposite direction to the melt 50 until the melt 50 is broken, ultimately cutting off the current. The arc-extinguishing cavity 20c is filled with an arc-extinguishing medium.

[0054] Specifically, when the drive device 30 triggers the generation of high-pressure gas to move the piston structure 10 to break the main circuit electrode 40, since the melt 50 is connected in parallel with the main circuit electrode 40, the current on the main circuit electrode 40 is transferred to the melt 50 to form a new circuit. Under high current flow conditions, because the melt 50 has a weak melting section 50a with a small diameter, it can generate a large amount of heat. At the moment the main circuit electrode 40 is broken, the melt 50 melts itself due to the excessive current, thus achieving circuit protection for high current flow. Under low current flow conditions, the heat generated by the melt 50 itself is insufficient to melt it. The positioning post 20f at the positioning through hole 50b and the melt pusher 70 work together to break the melt 50, thereby cutting off the circuit. Through the above design of the melt 50, the arc-extinguishing cavity 20c and the arc-extinguishing medium, the arc phenomenon generated when the main circuit electrode 40 is broken can be effectively avoided. At the same time, the arc generated by the melting of the melt 50 is absorbed in the arc-extinguishing cavity 20c, thereby effectively improving the breaking capacity and enhancing the performance reliability and safety of the device.

[0055] Further, please refer to Figure 3 The melt pusher 70 includes a support 71 extending axially toward the piston structure 10 and a fixing part 72 connected to the support 71. The fixing part 72 has at least one protrusion 73 on the side facing the melt 50. The melt 50 also has a slot 50c located in the movable cavity 20b and cooperating with the protrusion 73. The protrusion 73 is sleeved in the slot 50c, thereby fixing the melt 50 and facilitating the melt pusher 70 to drive the melt 50 to move, so that the melt pusher 70 can maintain a constant relative position with the melt 50 during movement. This design ensures the accuracy of the break-off operation, even under high current and high voltage conditions, ensuring that the positioning post 20f and the melt pusher 70 accurately act on the predetermined position on the melt 50. During assembly, the support body 71 of the melt pusher 70 corresponds to the support leg 12b of the piston structure 10, so that when the piston structure 10 moves, the support leg 12b pushes against the support body 71 to drive the melt pusher 70 to move, and then cooperates with the positioning column 20f to break the melt 50, ensuring that the break is formed in the arc extinguishing cavity 20c, thus ensuring the arc extinguishing effect.

[0056] In this embodiment, the total cross-sectional area of ​​the legs 12b of the piston structure 10 is preferably less than or equal to the total cross-sectional area of ​​the support body 71 of the melt pusher 70, with a preferred ratio of 0.9 to 1. This ensures precise engagement of the piston with the melt pusher 70, thereby propelling the melt pusher 70 to move. Specifically, when the piston structure 10 moves to the point of cutting off the main circuit electrode 40, the piston structure 10 drives the legs 12b to continue moving, causing the legs 12b to contact the support body 71 and thus propelling the entire melt pusher 70 to move synchronously, thereby cutting off the melt 50. Furthermore, the slot 50c of the melt 50 is fitted onto the protrusion 73 of the melt pusher 70, effectively restricting the position of the melt 50 while simultaneously driving the melt pusher 70 to push the melt 50. This ensures that the portion of the melt 50 located below the melt pusher 70 moves downwards under the guidance of the melt pusher 70, thereby applying a force to the melt 50 in a direction different from that applied to the melt 50 by the positioning post 20f.

[0057] In one implementation, please refer to Figure 8 The bottom of the movable cavity 20b is provided with a limiting part 201c, and the bottom sides of the melt pusher 70 are provided with protruding ribs 74, which overlap the limiting part 201c. Through the design of the protruding ribs 74 and the limiting part 201c, the movement distance of the melt pusher 70 can be effectively limited, further controlling the fracture surface of the melt 50 after it breaks in the arc-extinguishing cavity 20c, and avoiding excessive displacement of the melt 50 by the melt pusher 70, which would prevent the fracture surface from being accurately located in the arc-extinguishing cavity 20c.

[0058] Optionally, please refer to Figure 5 A slit 201b is provided between the fixed part 72 and the movable cavity 20b, and the width of the slit 201b is less than or equal to 2.5 times the thickness of the melt 50. This design effectively shortens the arc path and energy. Specifically, if the width of the slit 201b is too large, it will prolong the free path of the arc between the fracture surfaces, increasing the accumulation of arc energy and the risk of reignition. Therefore, this embodiment greatly shortens the arc path and reduces the accumulation of arc energy by limiting the width of the slit 201b, thereby reducing the risk of arc reignition.

[0059] During the melting and breaking of the molten metal 50, the generation of an electric arc is unavoidable, especially under high current and high voltage conditions. The traditional method of filling the arc-extinguishing cavity 20c with an arc-extinguishing medium still has insufficient arc-extinguishing capability. For the above issues, please refer to... Figure 6 In this embodiment, the internal structure of the arc-extinguishing cavity 20c is effectively improved to enhance the arc-extinguishing capability.

[0060] Specifically, the housing 20 has at least one isolation baffle 25 extending into the arc-extinguishing cavity 20c, which does not completely separate the arc-extinguishing cavity 20c. The design of the isolation baffle 25 not only increases the contact area between the arc and the arc-extinguishing medium, allowing the molten material 50 to bypass the isolation baffle 25 and thus extinguishing the arc more quickly, but also effectively extends and segments the arc path, effectively dividing the arc during its propagation around the isolation baffle 25, thereby further accelerating arc cooling and energy loss. Furthermore, while optimizing the spatial layout, it also helps reduce the risk of arc reignition.

[0061] The isolation barriers can be symmetrically or staggered along the melting path of the melt 50. For example, in this embodiment, the isolation barriers extend from the sidewalls (i.e., the upper and lower walls) of the self-extinguishing arc cavity 20c in the axial direction towards the center of the cavity. Of course, the isolation barriers 25 can also extend from the sidewalls (i.e., the left and right walls) of the self-extinguishing arc cavity 20c in the radial direction towards the center of the cavity. The specific positions and numbers can be reasonably set according to actual needs. For example, in low-voltage, low-current scenarios, there can be 1 to 2 isolation barriers 25, while in high-voltage, high-current scenarios, the number of isolation barriers 25 can be increased to 3 to 4. By further extending the arc path through multi-level segmentation, space can also be effectively saved.

[0062] The isolation barrier 25 is made of a material with high insulation, high temperature resistance and arc erosion resistance, and its shape includes but is not limited to strip-shaped flat plate, strip-shaped wavy, sawtooth, etc. The specific design is reasonably set according to actual needs, and this embodiment does not limit it.

[0063] Preferably, please refer to Figure 6 The arc-extinguishing cavity 20c has a first gap 20d and a second gap 20e formed on its sidewall. The end of the melt 50 extends from the first port to be connected in parallel with the main circuit electrode 40. The second gap 20e connects the arc-extinguishing cavity 20c and the movable cavity 20b. The melt 50 passes through the arc-extinguishing cavity 20c and the movable cavity 20b respectively via the second gap 20e. The isolation baffle 25 divides the arc-extinguishing cavity 20c into at least a first region 201c where the first gap 20d is located and a second region 202c where the second gap 20e is located. The first region 201c and the second region 202c are connected.

[0064] In specific implementation, the first gap 20d is used to draw out the molten material 50. The drawn-out molten material 50 can be connected in parallel with the main circuit electrode 40 via a connecting electrode, or it can be directly connected in parallel with the main circuit electrode 40. The first gap 20d is frustum-shaped. The second gap 20e is used to connect the arc-extinguishing chamber 20c and the active chamber 20b. To effectively prevent the arc from entering the active chamber 20b, in this embodiment, the second gap 20e should be adapted to the width of the molten material 50 to allow the molten material 50 to pass through and to prevent the arc-extinguishing medium in the arc-extinguishing chamber 20c from overflowing.

[0065] In this embodiment, the design of using the isolation baffle 25 to separate the area containing the first gap 20d and the area containing the second gap 20e is more conducive to the movement of the melt 50 within a limited space, extending the path of the arc during the cutting process. Simultaneously, it allows for better heat exchange between the arc and the surrounding medium as the arc propagates along the path, enabling the arc to be extinguished more quickly. Preferably, the end of the isolation baffle 25 extending into the arc-extinguishing cavity 20c is at a different horizontal height from the location of the second gap 20e, further improving the arc-extinguishing efficiency.

[0066] In some embodiments, please refer to Figure 9 The melt 50 is provided with several weak sections spaced apart. The weak sections include a positioning through hole 50b and a melting weak section 50a. Both the positioning through hole 50b and the melting weak section 50a are located in the arc extinguishing cavity 20c.

[0067] In practical implementation, the weak section can be a narrow-diameter design with a reduced cross-sectional area along the width of the melt 50, such as a circular through-hole, an elongated through-hole, a notch, or a locally thinned structure, compared to other locations. By designing the weak section within the arc-extinguishing cavity 20c, the arc-extinguishing effect can be effectively achieved when the melt 50 is cut off.

[0068] In an alternative implementation, please continue reading. Figure 9 The cross-sectional area along the width direction between adjacent weak fusion segments 50a (i.e., the narrow diameter of the weak segment) is smaller than the cross-sectional area along the width direction between adjacent positioning through holes 50b. The smaller the cross-sectional area of ​​the narrow diameter, the higher the current density through the narrow diameter, and the faster the heat accumulation.

[0069] This design allows the weak section 50a of the melt 50 to be accelerated and automatically melted under the action of current, while the positioning through hole 50b of the melt 50 is pulled apart under the action of the melt pusher 70 and the positioning post 20f, effectively realizing a multi-stage disconnection mechanism and improving the high breaking capacity of the pyrotechnic cutter.

[0070] In another alternative implementation, please refer to [link / reference needed]. Figure 9The weak section 50a includes a plurality of first pre-melting through holes 501a near the end of the isolation barrier 25 and a plurality of second pre-melting through holes 502a away from the end of the isolation barrier 25. The transverse cross-sectional area of ​​the narrow diameter between adjacent first pre-melting through holes 501a is smaller than that between adjacent second pre-melting through holes 502a. Furthermore, the number of first pre-melting through holes 501a is greater than the number of second pre-melting through holes 502a. Because the first pre-melting through holes 501a have a small transverse cross-sectional area, high current density, large heat generation, and rapid heat accumulation, their melting speed is fast, making them more likely to be melted preferentially. That is, the first pre-melting through holes 501a near the isolation barrier 25 are melted preferentially compared to the second pre-melting through holes 502a away from the isolation barrier 25. The disconnection time difference can be designed by adjusting the number and / or width of the narrow apertures, so that the arc is preferentially segmented under the action of the isolation barrier, achieving multi-stage arc extinguishing and further accelerating the extinguishing of the arc.

[0071] For better results, please continue reading. Figure 9 An external protrusion 501b is provided at the edge of the positioning through hole 50b. The narrow width of the external protrusion 501b is the smallest compared to other positions of the positioning through hole 50b, resulting in more concentrated stress and making it easier to break. By setting the external protrusion 501b, the location of the mechanical fracture can be more accurately determined, further ensuring that the fracture forms in the arc-extinguishing cavity 20c outside the movable cavity 20b, thus ensuring the arc-extinguishing effect.

[0072] Preferably, the depth of the active cavity 20b (i.e., the linear movement distance of the melt pusher 70 within the active cavity 20b) is greater than or equal to 3.0 mm. This limitation effectively ensures that when the positioning through hole 50b is broken by the melt pusher 70, its breakage position is located in the arc extinguishing cavity 20c.

[0073] Through the above design, the pyrotechnic cutter of the present invention significantly improves the breaking capacity and arc extinguishing capacity, especially performing well under high current and high voltage conditions, effectively protecting the safety of circuits and equipment.

[0074] It should be noted that, based on the above concept, and depending on the actual needs of the pyrotechnic cutter, those skilled in the art may also add other internal components to the pyrotechnic cutter, all of which fall within the protection scope of this utility model.

[0075] Example 2

[0076] Please see Figures 10-12 Based on Embodiment 1, this embodiment further improves the piston structure 10. Specifically, the piston structure 10 includes at least a first part 11 and a second part 12 connected to the first part 11.

[0077] The piston structure 10 is made of insulating material and includes a first part 11 and a second part 12 that are connected to each other. The first part 11 is a columnar structure with a non-circular cross-section. When the piston structure 10 is used in the pyrotechnic cutter, the groove 13 of the first part 11 is positioned towards the high-pressure gas release end of the drive device 30.

[0078] The first part 11 is an axially extending columnar structure with a non-circular radial cross-section. Compared to a traditional circular radial cross-section, it offers greater flexibility. Its non-circular design maintains compactness in spatially constrained directions (such as the longer width direction) while increasing the area in directions allowing extension (such as the shorter width direction), achieving local area optimization and improved energy harvesting efficiency. Specifically, the piston surface area of ​​a traditional circular radial cross-section is uniform, while the piston area of ​​a non-circular design varies. Therefore, when high-pressure gas pushes the piston, the non-circular piston, compared to a circular piston, exhibits several advantages. First, the dimensional difference between its longer and shorter widths allows for a more uneven force distribution. This uneven force distribution facilitates rapid gas expansion across the piston surface, filling a larger piston area and thus improving energy harvesting efficiency. Second, compared to the linear gas flow of a circular piston structure, the non-circular piston structure guides the high-pressure gas into a specific non-linear flow path. This path helps reduce turbulence and energy loss during gas flow, making it easier to achieve rapid energy filling and expansion, thereby improving energy harvesting efficiency.

[0079] Furthermore, due to the differences in cross-sectional shape and area of ​​the non-circular piston structure, different pressures will be formed in different areas when high-pressure gas acts on the piston structure. This pressure difference can generate additional driving force to propel the piston structure, enhancing its kinetic energy. Moreover, the pressure difference driving effect allows the non-circular piston structure to achieve greater kinetic energy conversion efficiency under the same gas pressure. Simultaneously, when the non-circular piston structure is applied to the same non-circular cross-section stroke cavity in a pyrotechnic switcher, compared to a circular piston structure applied to the same circular cross-section stroke cavity, its combined application allows the piston channel to become a larger non-circular cavity after the main circuit electrode is cut off. This facilitates the rapid release of residual gas pressure after the main circuit electrode is cut off, avoiding the risk of structural damage due to pressure accumulation, thereby improving the reliability and safety of the equipment.

[0080] Specifically, the radial cross-section of the first part 11 is a non-circular shape composed of an ellipse, a racetrack shape, or a composite circular arc. Taking an ellipse as an example, the lengths of its major and minor axes are designed according to energy conversion requirements. In this embodiment, the radial cross-section of the first part 11 is preferably elliptical. Compared with a circle, the elliptical design not only increases the area but also optimizes the gas flow path and kinetic energy conversion efficiency. In particular, the elliptical shape can generate a more uniform force distribution when the gas is pushed, reducing energy loss and improving kinetic energy release efficiency. Furthermore, when the piston structure 10 of the elliptical first part 11 is applied in the stroke cavity 20a of the pyrotechnic cutter, the stroke cavity 20a that matches the elliptical first part 11 is also an elliptical cylindrical cavity. Compared with a conventional cylindrical cavity, the elliptical cylindrical cavity can guide the high-pressure gas to form a spiral flow path and reduce turbulent energy loss, effectively improving gas filling efficiency compared to a cylindrical cavity.

[0081] For further information, please refer to [link / reference]. Figure 12 When the radial cross-section of the first portion 11 is elliptical, the ratio of the major axis dimension W1 to the minor axis dimension W2 of the first portion 11 is between 1.2:1 and 1.8:1 to ensure that the piston structure 10 can both guide the movement well and withstand the pressure of high-pressure gas. Specifically, if the ratio is too high, although the piston area can be further increased, its mechanical strength will decrease and it will be prone to deformation under high pressure. If the ratio is too low, although the structural stability will be enhanced, the energy harvesting efficiency will decrease. Therefore, this embodiment can effectively balance mechanical strength and energy harvesting efficiency through its ratio limitation. In particular, when the piston structure 10 is used in high-frequency vibration or thermal expansion applications (e.g., in thermal expansion pyrotechnic cutters), this ratio limitation allows for expansion margins in the minor axis, reducing frictional losses caused by thermal deformation. The ratio of the major axis dimension W1 to the minor axis dimension W2 can be 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, etc. For example, the major axis is 24mm and the minor axis is 16mm, with a ratio of 1.5:1.

[0082] At least one sealing groove 11a is provided on the outer peripheral surface of the first part 11 along the circumferential direction, and a sealing element 60 is fitted in the sealing groove 11a. When the piston structure 10 is installed in the pyrotechnic cutter, the sealing element 60 seals the contact surface between the outer peripheral surface of the piston structure 10 and the pyrotechnic cutter, so as to ensure that all the high-pressure gas released by the drive device 30 acts on the piston structure 10.

[0083] The first portion 11 has a recess 13 on its end face away from the second portion 12. The axial extension direction of the recess 13 is consistent with the axial direction of the first portion 11, and the radial cross-sectional shape of the recess 13 is circular. The recess 13 is used to collect high-pressure gas and convert it into the kinetic energy of the piston structure 10. The circular diameter D of the maximum radial cross-section of the recess 13 is smaller than the minor axis dimension W2. For example, if the minor axis dimension W2 is 16 mm, the circular diameter D is 10 mm.

[0084] In this embodiment, the radial cross-sectional diameter of the groove 13 preferably varies with the depth of the groove 13. That is, the radial cross-sectional diameter of the groove 13 is not completely constant (i.e., not cylindrical), but rather the radial cross-sectional diameter along the depth direction decreases (i.e., the axial cross-section is arc-shaped) or the radial cross-sectional diameter along the depth direction remains constant and then decreases (i.e., the axial cross-section is U-shaped), which is beneficial for guiding airflow.

[0085] In this embodiment, the ratio of the maximum radial cross-sectional area of ​​the first portion 11 to the maximum radial cross-sectional area of ​​the groove 13 is preferably between 3.5 and 4.0. More preferably, the ratio of the maximum radial cross-sectional area of ​​the first portion 11 to the maximum radial cross-sectional area of ​​the groove 13 is 3.84:1. Please refer to [link / reference]. Figure 4 The maximum radial cross-sectional area of ​​the first part 11 is S2, and the maximum radial cross-sectional area of ​​the groove 13 is S1.

[0086] The aforementioned area ratio design ensures that the elliptical piston can more effectively capture and concentrate energy when the drive device 30 triggers and generates high-pressure gas. The high-pressure gas first enters the recess 13. Because the area of ​​the ellipse is much larger than the area of ​​the recess 13, the gas can quickly fill and expand throughout the entire elliptical cavity as it propels the piston forward, thereby maximizing energy harvesting. Simultaneously, the piston structure 10 with this area ratio, applied to the stroke cavity 20a with a matching shape, also helps to quickly release residual gas pressure after the main electrode sheet is cut off, avoiding structural damage caused by pressure accumulation.

[0087] Its working principle is as follows: When the piston structure 10 is applied to the pyrotechnic cutter, the high-pressure gas generated by the drive device 30 first enters the groove 13. Since the maximum radial cross-sectional area of ​​the first part 11 is more than 3.5 times the maximum radial cross-sectional area of ​​the groove 13, the high-pressure gas rapidly fills and expands to the entire surface of the piston structure 10 facing the groove 13 under pressure, forming a pressure difference driving effect. The high-pressure gas can be more effectively captured and concentrated by the piston structure 10. This increases the effective force-bearing area of ​​the gas pushing the piston, thereby efficiently converting the gas into the kinetic energy of the piston, pushing the piston to move at high speed along the axial direction (the speed can reach more than 1.5 times that of a traditional circular piston design).

[0088] Further, please refer to Figure 11 The ratio of the axial depth d1 of the recess 13 to the axial height d2 of the first part 11 is between 1 / 3 and 1 / 2. In the design of the recess 13 and the piston structure 10, if the ratio is too small, there will be insufficient space for gas to accumulate in the recess 13, which may lead to insufficient kinetic energy and reduced breaking efficiency of the piston structure 10. If the ratio is too large, it will increase the frictional resistance of gas flow, which is not conducive to the effective collection of energy. Therefore, by limiting the ratio of the depth of the recess 13 to the height of the first part 11 and combining the area ratio of the two, this embodiment can improve the energy conversion efficiency of the piston structure 10 and reduce energy loss without changing the initial kinetic energy provided by the drive device 30. This ensures that the piston structure 10 obtains sufficient kinetic energy to quickly and efficiently cut off the main circuit electrode 40, while also effectively guaranteeing the mechanical strength of the structure.

[0089] Please continue reading. Figure 10 , Figure 11 The second part 12 is axially connected to the first part 11 and can be integrally formed. The second part 12 extends along the wider radial direction of the first part 11 to form a strip structure, and its width along the narrower radial direction of the first part 11 is smaller than the wider radial width of the first part 11. Taking the radial cross-section of the first part 11 as an example, the second part 12 extends along the major axis of the ellipse, and its width along the minor axis of the ellipse is smaller than the length of the major axis of the first part 11. This design can further save space effectively, allowing more of the kinetic energy of the high-pressure gas to be released within the space of the piston structure 10. More preferably, a boss 12d and / or a reinforcing rib 12f are also provided at the connection between the second part 12 and the first part 11 (i.e., at the abrupt change in the radial cross-section of the piston structure 10) to enhance the strength of the piston structure 10 and prevent stress damage to the abrupt cross-section caused by the piston structure 10 during high-pressure impact.

[0090] Please see Figure 11The second part 12 has a piston cutter 12a formed at one end away from the first part 11. The end face of the piston cutter 12a has a convex structure to perform the action of cutting off the main circuit electrode 40. The convex structure can be a V-shape, inverted trapezoid, inverted V-shape, or triangular structure with an impact blade surface. The shape and structure of the piston cutter 12a can be determined according to requirements. Furthermore, the second part 12 also has legs 12b located at both ends of the piston cutter 12a and extending axially away from the first part 11. The legs 12b protrude from the piston cutter 12a in the axial direction away from the first part 11 so that, when applied to the pyrotechnic cutter, they can push the melt pusher 70 to move within the movable cavity 20b. The legs 12b can be one or more designs, and their specific structure can be reasonably adjusted according to actual needs. Preferably, a limiting block 12c is also provided on the side of the second part 12. When the piston structure 10 is used in a pyrotechnic cutter, the design of the limiting block 12c can restrict the piston structure 10 to move only within the stroke chamber 20a.

[0091] To effectively illustrate the role and effect of the piston structure 10 in the pyrotechnic shut-off device, this embodiment conducts a multiphysics coupled simulation analysis experiment to verify the energy harvesting efficiency and pressure release stability of the piston structure 10. The simulation experiment uses the Navier-Stokes equations as a fluid dynamics model to analyze gas flow and employs an energy loss formula to analyze the energy harvesting status.

[0092] Specifically, the Navier-Stokes equations are: In the formula, ρ is the gas density, u is the velocity vector, p is the pressure, μ is the dynamic viscosity, and F is the volume force. Its boundary conditions include an inlet peak pressure of 1~2 MPa (triggered by drive device 30), an outlet free flow (ambient pressure 0 MPa), and a piston material of PPA (polyphthalamide). The energy loss formula is... In the formula, the energy loss (ΔE) during gas flow is related to the rate of change of the cross-sectional area of ​​the flow channel (S2 / S1), where S2 is the maximum radial cross-sectional area of ​​the first part 11 and S1 is the maximum radial cross-sectional area of ​​the groove 13. This represents the flow velocity of the high-pressure gas entering the groove 13, expressed in m / s. This energy loss formula can be used to minimize ΔE through S2 / S1, while simultaneously ensuring that the gas diffusion rate matches the pressure release rate.

[0093] Furthermore, the simulation experiments were conducted using ANSYS Fluent (CFD simulation), with an unstructured mesh, a boundary layer refinement of 3 layers, and a mesh quality > 0.8. The physical models employed were the k-ε turbulence model (high-speed airflow region, velocity > 100 m / s) and the laminar flow model (low-speed region, velocity < 50 m / s). Based on the above design, the simulation experiments utilized the elliptical piston structure designed in this embodiment to analyze the impact of the area ratio on performance under the same conditions through simulations of different area ratios. Specific simulation results are shown in the table below:

[0094]

[0095] As shown in the table above, when the ratio of the maximum radial cross-sectional area of ​​the first part 11 to the maximum radial cross-sectional area of ​​the groove 13 increases from 2.5:1 to 4.2:1, the energy conversion efficiency increases from 68.3% to 92.1%. Furthermore, when the ratio is 3.84:1, the energy conversion efficiency is 89.7%, the pressure release time is 13ms, and the structural stability rating is A+. Therefore, this ratio represents the optimal balance between energy conversion efficiency and stability. In addition, although energy conversion efficiency is also high (over 90%) when the ratio is greater than 3.84:1 (e.g., 4.0:1, 4.1:1, and 4.2:1), there are potential risks to structural stability at these ratios. In particular, when the ratio exceeds a critical point (e.g., above 4.0:1), the PPA material may experience creep risk under high pressure (stress > 50MPa), which could lead to a decrease in the performance of the pyrotechnic cutter or even failure. Therefore, although the energy conversion efficiency is higher at these ratios, they are not suitable as the optimal balance point due to structural stability limitations. In summary, a ratio of 3.84:1 achieves the optimal balance between energy conversion efficiency, pressure release time, and structural stability. Therefore, it is determined to be the A+ optimal balance point for pyrotechnic cut-off device design.

[0096] The data in the table above are based on ANSYS Fluent multiphysics coupling simulation, with mesh independence verification error <2% and physical model error <5%.

[0097] It should be noted that the structural stability ratings for piston structure 10 in the table are based on simulation characterization of the structure under various operating conditions. The rating criteria for this embodiment are as follows:

[0098] A- (Good Stability) indicates good structural stability in simulation experiments, but slight creep risk or deformation may exist under extreme conditions (such as when the area ratio is close to the critical point); A (Better Stability) indicates that the design exhibits excellent structural stability under various operating conditions, with creep risk and deformation within acceptable ranges; A+ (Optimal Stability) indicates that the design exhibits outstanding structural stability in simulation experiments, with extremely low creep risk and deformation, and also achieving an optimal balance in terms of energy conversion efficiency and pressure release time. This is the ideal state of the design, indicating that the design has achieved optimal solutions in multiple key performance indicators.

[0099] B- (Local stress concentration) indicates that there is a problem of local stress concentration in the design, which may increase the risk of structural damage or failure under high pressure. B (Slight deformation) indicates that the design exhibits slight deformation in simulation experiments. Although it does not affect the overall function, it may mean that the performance will be degraded in long-term use or under extreme conditions. B+ (Acceptable stability) indicates that the design exhibits acceptable structural stability overall, but may require additional monitoring and maintenance under certain specific conditions (such as high temperature, high pressure, etc.).

[0100] Meanwhile, this simulation experiment also uses a traditional circular piston to analyze the impact of area ratio on performance by simulating different area ratios under the same conditions. The specific simulation results are shown in the table below:

[0101]

[0102] As can be seen from the above, compared with the experimental results of the elliptical piston structure (i.e., the first part of the radial cross-section is elliptical), the performance parameters of the traditional circular piston structure (i.e., the first part of the radial cross-section is circular) are generally lower. Furthermore, as the ratio increases, the performance gap between the circular and elliptical piston structures gradually widens, which verifies the expected trend in the design of this embodiment.

[0103] In summary, the pyrotechnic cutter provided by this utility model, through optimized design of the isolation baffle, positioning post, and molten body structure, can extend the arc path within a limited space, accelerating arc cooling and energy dissipation. In particular, the precise positioning of the cutting edge significantly improves the pyrotechnic cutter's breaking and arc-extinguishing capabilities, exhibiting excellent performance under high current and high voltage conditions. This ensures the accuracy and stability of the cutting process, effectively protecting the circuit and equipment safety. Furthermore, through specific structural and parameter design of the piston structure, not only is the breaking capacity and response speed of the pyrotechnic cutter improved, but the reliability, safety, and service life of the pyrotechnics are also effectively enhanced, showing promising application prospects.

[0104] Furthermore, those skilled in the art should understand that although many problems exist in the prior art, each embodiment or technical solution of this utility model can be improved in only one or a few aspects, without necessarily solving all the technical problems listed in the prior art or background art simultaneously. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as a limitation on that claim.

[0105] Although this document frequently uses terms such as piston structure, first part, second part, groove, piston cutter, housing, upper shell, middle shell, lower shell, drive device, main circuit electrode, melt, seal, and melt pusher, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model. The terms "first," "second," etc. (if present), in the description, claims, and accompanying drawings of the embodiments of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fireworks cutter, characterized in that, include: Housing, drive unit, melt and cutting structure; The shell has interconnected travel cavities, movable cavities, and at least one arc-extinguishing cavity inside; At least a portion of the melt is located within the arc-extinguishing cavity and passes through the movable cavity; The cutting structure, driven by the drive device, passes through the stroke cavity and moves to the endpoint in the movable cavity; The shell extends into the arc-extinguishing cavity to form at least one positioning post. The positioning post is located on the outside of the cutting structure. The melt has at least one set of positioning through holes, which are located in the arc-extinguishing cavity. The positioning through holes are sleeved on the positioning post and are used to laterally pull the melt apart during the movement of the cutting structure.

2. The smoke cutter according to claim 1, characterized in that: The positioning post has a conical column structure; the positioning through hole is elongated, and the positioning post abuts against the side wall of the positioning through hole away from the cutting structure.

3. The smoke cutter according to claim 2, characterized in that: The melt has several weak sections spaced apart. The weak sections include positioning through holes and melting weak sections, both of which are located in the arc-extinguishing cavity.

4. The smoke cutter according to claim 3, characterized in that: The housing has at least one isolation baffle extending into the arc-extinguishing cavity; the weak section of the fuse includes a plurality of first pre-fusible through holes near the end of the isolation baffle and a plurality of second pre-fusible through holes away from the end of the isolation baffle; the transverse cross-sectional area along the width direction between adjacent first pre-fusible through holes is smaller than the transverse cross-sectional area along the width direction between adjacent second pre-fusible through holes.

5. The smoke cutter according to claim 2, characterized in that: The positioning through hole has an outward protrusion in the middle.

6. The smoke cutter according to claim 1, characterized in that: It also includes a main circuit electrode, the melt being connected in parallel with the main circuit electrode, the main circuit electrode having at least one weak break section; the cutting structure includes a piston structure and a melt pusher, the driving device driving the piston structure to cut off the weak break section of the main circuit electrode to form a fracture; the melt pusher driving the melt to move; the housing is provided with a reinforcing structure, the reinforcing structure including at least one of an inner plate, an inner sleeve, and a pressure plate embedded in the housing.

7. The smoke cutter according to claim 6, characterized in that: The melt pusher includes a support extending axially toward the piston structure and a fixing part connected to the support. The fixing part has at least one protrusion on the side facing the melt. The melt also has a slot located in the movable cavity and cooperating with the protrusion. The protrusion is sleeved in the slot.

8. The smoke cutter according to claim 7, characterized in that: There is a slit between the fixed part and the movable cavity, and the width of the slit is less than or equal to 2.5 times the thickness of the melt.

9. The smoke cutter according to claim 1, characterized in that: The bottom of the movable cavity is provided with a limiting part, and the bottom sides of the melt pusher are provided with protruding ridges, which overlap the limiting part. The depth of the movable cavity is at least 3.0 mm.

10. The smoke cutter according to claim 6, characterized in that: The piston structure includes a first part and a second part connected to the first part. The first part is a columnar structure extending along the axial direction, and its radial cross-sectional shape is non-circular. The first part has a groove for receiving gas impact on the end face away from the second part, and the axial extension direction of the groove is consistent with the axial direction of the first part. The second part has a piston cutter formed at the end away from the first part, and the end face of the piston cutter has a convex structure.

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