A disconnect mechanism and method for a fuse

Abstract

The present application relates to switch contact operating mechanism, more particularly to the technical field of fuse, and disclose a kind of opening mechanism and opening method of fuse, including insulating sleeve, one end of the insulating sleeve is provided with protection part, the other end of the insulating sleeve is provided with reset part, both ends of the insulating sleeve are sleeved with positioning sheet, the positioning sheet on one end of the insulating sleeve is installed with disconnecting part, the positioning sheet on the other end of the insulating sleeve is installed with unlocking part, disconnecting part and unlocking part are connected with switch piece, support is installed on the disconnecting part, the protection part includes cylinder sleeve one, the cylinder sleeve one is fixedly connected in the inside of insulating sleeve, the inner wall of the cylinder sleeve one is slidably connected with inner cylinder, without additional heating and drying device, fuse is fused instantaneous high temperature is used for SF6 gas rapid drying, driving spring leaf directional bending unlocking switch piece, completely solve the problem of high temperature energy loss waste, improve energy utilization and simplify mechanism structure.

Description

Technical Field

[0001] This invention relates to switch contact operating mechanisms, and more specifically to the field of fuse technology, specifically to a fuse disconnection mechanism and disconnection method. Background Technology

[0002] In the fields of power system distribution protection and electrical equipment overload / short circuit protection, fuses, as core one-time protection components, play a crucial role in cutting off the circuit by melting the internal fuse wire when overload or short circuit faults occur, thus preventing damage to downstream equipment and safety accidents. The fuse disconnection structure is integrated inside the insulated gate bipolar transistor module for short circuit protection of power semiconductor modules. It belongs to the supporting structure of power electronic components and falls under the category of power electronic component manufacturing industry such as metal oxide semiconductor field-effect transistors, insulated gate bipolar transistor chips and modules.

[0003] Currently, fuses using SF6 gas arc extinguishing rely on the arc energy generated after the fuse melts to drive the arc extinguishing device and disconnect the circuit. However, such mechanisms do not effectively utilize the high temperature generated at the moment the fuse melts. A large amount of high-temperature energy is lost through heat dissipation, which not only wastes energy but may also cause temperature imbalance inside the fuse due to uneven heat dissipation, affecting the arc extinguishing performance of SF6 gas.

[0004] In existing fuse disconnection mechanisms, the reed is the core actuating component. Most reeds are directly installed inside the fuse, overlapping with the fuse wire and SF6 gas cavity. The high temperature generated by the fuse melting can easily cause uneven heating of the reed, making it impossible to achieve precise directional bending and affecting the operating accuracy of the disconnection mechanism. The long-term action of the internal high temperature environment on the reed can easily lead to metal fatigue and elasticity decay of the reed, shortening its service life, and even problems such as reed breakage and deformation failure, making it impossible to achieve reliable disconnection of the switch.

[0005] In addition, as an excellent arc-extinguishing medium, the arc-extinguishing performance of SF6 gas is closely related to the dryness of the gas. If SF6 gas contains moisture, it will reduce its insulation performance and arc-extinguishing efficiency, and may even produce corrosive gases under the high temperature of the electric arc, damaging the internal components of the fuse, reducing the sealing performance, and causing safety hazards.

[0006] In existing technologies, the drying of SF6 gas is mostly achieved by setting up additional desiccants or heating devices. Desiccants are prone to failure after long-term use and need to be replaced regularly, resulting in high maintenance costs. Additional heating devices have problems such as high energy consumption and slow response, and cannot quickly dry SF6 gas at the moment the fuse melts, making it difficult to match the coordinated requirements of millisecond-level arc extinguishing and disconnection. Summary of the Invention

[0007] (a) Technical problems to be solved

[0008] To address the shortcomings of existing technologies, this invention provides a fuse disconnection mechanism and disconnection method, which solves the problems of low high-temperature energy utilization rate of fuse melting, slow SF6 gas drying response, and low spring action accuracy in existing technologies, which lead to inaccurate switch disconnection timing and easy failure.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, the present invention provides the following technical solution: a fuse disconnection mechanism, comprising an insulating sleeve, a protective part at one end of the insulating sleeve, a reset part at the other end of the insulating sleeve, positioning plates at both ends of the insulating sleeve, a disconnection part installed on the positioning plate at one end of the insulating sleeve, an unlocking part installed on the positioning plate at the other end of the insulating sleeve, a switch connecting the disconnection part and the unlocking part, and a support installed on the disconnection part.

[0011] Preferably, the protective part includes a cylinder sleeve one, which is fixedly connected to the inside of an insulating sleeve. An inner cylinder is slidably connected to the inner wall of the cylinder sleeve one. A cylinder is fixedly connected to one end of the inner cylinder. A contact sleeve is provided inside the cylinder and is fixedly connected to the end of the inner cylinder. A piston is fixedly connected to the inner wall of the end of the cylinder. A cylinder sleeve two is fixedly connected to the inner wall of the insulating sleeve. A contact is fixedly connected to the inner wall of the cylinder sleeve two. The contact is inserted into the contact sleeve.

[0012] Preferably, the insulating sleeve is provided with a contact layer that is fixedly connected to the cylinder liner, and a heat-conducting layer is fixedly connected between the contact layer and the inner wall of the insulating sleeve. The cylinder is slidably connected to the inner wall of the contact layer and to the inner wall of the cylinder liner. One end of the insulating sleeve is provided with a connection terminal that is fixedly connected to the contact.

[0013] Preferably, the reset part includes a second connecting terminal, which is fixedly connected to the other end of the insulating sleeve. A reset plate is slidably connected to the inner wall of the insulating sleeve. A spring is elastically connected between the reset plate and the end of the cylinder sleeve away from the cylinder. A support arm is fixedly connected to the reset plate, and the support arm is also fixedly connected to the other end of the inner cylinder.

[0014] Preferably, a fuse is welded to the reset piece, and the fuse slides through the inner cylinder and passes through the inside of the contact sleeve to be welded to the contact.

[0015] Preferably, the disconnection part includes a bracket, which is fixedly connected to one of the positioning plates. The positioning plate has a through hole, and an mounting plate is fixedly connected to the inner wall of the positioning plate. A spring plate 1 and a spring plate 2 are threadedly connected to the mounting plate by bolts. The spring plate 1 and the spring plate 2 are welded together and fit against the inner wall of the through hole.

[0016] Preferably, the disconnection part further includes a heat insulation sheet, a heat-conducting sheet is fixedly connected between the heat insulation sheet and the first spring, a heat-conducting pipe is fixedly connected to the heat-conducting sheet through the heat insulation sheet, the heat-conducting pipe is fixedly connected through the insulating sleeve and fixedly connected to the heat-conducting layer, a second fuse is welded between the first spring and the end of the switch, a retaining sleeve is fixedly connected to the bracket, the retaining sleeve is snapped into the switch, and a hinge arm is hinged between the retaining sleeve and the first spring.

[0017] Preferably, the unlocking part includes a locking plate, which is an L-shaped structure. One end of the locking plate is fixedly sleeved on the end of the second connecting terminal. A support plate is fixedly connected between the inner walls of the other positioning piece and the support plate. A second spring is provided on the support plate. A pressure plate is elastically connected to the support plate through the second spring. A top rod is fixedly connected to the pressure plate. A slot is provided at the other end of the locking plate. The locking plate is inserted into the outer wall of the top rod through the slot and abuts against the pressure plate. A switch base is fixedly connected to the other positioning piece. The end of the top rod slides through the switch base.

[0018] Preferably, the other end of the switch is rotatably connected to the inner wall of the switch base and abuts against the through end of the top rod, the support is fixedly connected to the bracket, and the snap-fit ​​end of the switch and the sleeve is disposed on the support.

[0019] A method for disconnecting a fuse, according to the aforementioned fuse disconnecting mechanism, includes the following steps:

[0020] S1. The insulating sleeve connects to the conductive components through connection terminal one and connection terminal two to form a complete circuit loop. Fuse one is connected in series in the circuit through connection terminal two, reset piece and contact.

[0021] S2. When the fuse breaks, the spring overcomes the pressure of the reset plate and pushes the reset plate to slide on the inner wall of the insulating sleeve. The reset plate pulls the inner cylinder to slide on the inner wall of the cylinder sleeve through the support arm, and at the same time drives the cylinder to slide, causing the contact sleeve to separate from the contact. The piston compresses the SF gas in the cylinder to fill the separation area to extinguish the arc. When the fuse breaks, the instantaneous high temperature is transferred to the heat-conducting layer through the contact layer, and at the same time heats the inner wall of the insulating sleeve to keep the SF gas dry.

[0022] S3. The heat-conducting layer transfers temperature to spring 1 through heat-conducting pipe and heat-conducting sheet. The heat insulation sheet prevents the temperature from being lost quickly. The thermal expansion coefficient of spring 1 is greater than that of spring 2. Spring 1 deforms when heated and bends away from the through hole in the direction of spring 2. Spring 1 bends and pulls the sleeve through the hinge arm to deform and disengage from the end of the switch. Fuse 2 is heated and breaks due to the tension of spring 2.

[0023] S4. The reset plate synchronously pushes the second connecting terminal to slide, and the second connecting terminal drives the locking plate of the connection to move axially, causing the bayonet to move away from the pressure plate. The second spring overcomes the pressure of the pressure plate and drives the top rod to slide and lift the rotating end of the switch, causing the switch to rotate around the switch base as the axis, and then causing the switch to lift away from the support, thus completing the disconnection.

[0024] (III) Beneficial Effects

[0025] Compared with the prior art, the present invention provides a fuse disconnection mechanism and disconnection method, which has the following beneficial effects:

[0026] 1. The disconnection mechanism and disconnection method of this fuse do not require additional heating and drying devices. The instantaneous high temperature of the fuse melting is simultaneously used for rapid drying of SF6 gas and for driving the spring to bend in a directional manner to unlock the switch, which completely solves the problem of high temperature energy loss and waste, improves energy utilization and simplifies the mechanism structure.

[0027] 2. The tripping mechanism and tripping method of the fuse simultaneously complete the SF6 gas compression arc extinguishing and high-temperature heating drying after the fuse wire breaks, ensuring the dryness of SF6 gas and arc extinguishing performance, avoiding safety hazards such as reduced insulation capacity and generation of corrosive gases caused by moisture, and the drying response is synchronized with the arc extinguishing, matching the millisecond-level protection requirements.

[0028] 3. The tripping mechanism and tripping method of this fuse utilize the difference in thermal expansion coefficients between spring 1 and spring 2, combined with a heat insulation sheet to reduce heat loss and a heat-conducting sheet to achieve uniform heating, thereby achieving precise bending of the spring and stable unlocking of the ferrule through the hinge arm, thus solving the problems of uneven heating, deformation failure, and unreliable unlocking of the spring.

[0029] 4. The tripping mechanism and tripping method of this fuse use the breakage of fuse one as the total trigger signal to achieve millisecond-level precise linkage of initial tripping driven by the reset part, arc extinguishing and drying of the protection part, unlocking limit of the tripping part, and final tripping of the unlocking part. It is also equipped with triple protection of secondary tripping of fuse two, initial tripping of contact sleeve and contact, and complete tripping of switch components to prevent circuit reignition and improve tripping reliability.

[0030] 5. The disconnection mechanism and disconnection method of this fuse eliminate the need for additional desiccant, heating device, and electromagnetic drive mechanism. Through integrated linkage, it achieves the autonomous completion of the entire process of fuse triggering, arc extinguishing drying, directional unlocking, and complete disconnection, reducing manufacturing costs and maintenance difficulty, and adapting to the complex operating conditions of power protection.

[0031] 6. The tripping mechanism and tripping method of this fuse adopt mechanical energy storage drive, which has a fast response speed. It uses the energy storage release of spring one and spring two to achieve mechanical linkage drive, with no electrical drive delay. The action of each component is seamlessly connected. It is integrated into the insulated gate bipolar transistor module and used for short circuit protection of power semiconductor modules. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is an internal sectional view of the insulating sleeve of the present invention;

[0034] Figure 3 For the present invention Figure 2 Enlarged view of A in the middle;

[0035] Figure 4 For the present invention Figure 2 Enlarged view of B in the middle;

[0036] Figure 5 This is a diagram showing the mating of the second connecting terminal and the unlocking part of the present invention;

[0037] Figure 6 This is a schematic diagram of the unlocking part of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of the disconnection part of the present invention;

[0039] Figure 8 This is a diagram showing the fit between reed one and reed two of the present invention;

[0040] Figure 9 This is a diagram showing the fit between the switch and the disconnection part of the present invention.

[0041] In the diagram: 1. Insulating sleeve; 2. Protective part; 21. Cylinder liner one; 22. Inner cylinder; 23. Cylinder; 24. Contact sleeve; 25. Piston; 26. Cylinder liner two; 27. Contact; 28. Contact layer; 29. ​​Heat-conducting layer; 210. Connecting terminal one; 3. Reset part; 31. Connecting terminal two; 32. Reset piece; 33. Spring one; 34. Support arm; 35. Fuse one; 4. Positioning piece; 5. Break 51. Opening; 52. Bracket; 53. Through hole; 54. Mounting piece; 55. Spring 1; 56. Spring 2; 57. Insulation sheet; 58. Heat-conducting sheet; 59. Heat-conducting pipe; 50. Fuse 2; 510. Sleeve; 511. Hinge arm; 6. Unlocking part; 61. Locking plate; 62. Support plate; 63. Spring 2; 64. Pressure plate; 65. Top rod; 66. Switch base; 7. Switch component; 8. Support. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Please see Figure 1 - Figure 9 The present invention provides a fuse disconnection mechanism, including an insulating sleeve 1, a protective part 2 at one end of the insulating sleeve 1, a reset part 3 at the other end of the insulating sleeve 1, positioning pieces 4 at both ends of the insulating sleeve 1, a disconnection part 5 installed on the positioning piece 4 at one end of the insulating sleeve 1, an unlocking part 6 installed on the positioning piece 4 at the other end of the insulating sleeve 1, a switch 7 connecting the disconnection part 5 and the unlocking part 6, and a support 8 installed on the disconnection part 5.

[0044] In this invention, the protection unit 2, as a core functional component for fuse circuit conduction, arc extinguishing, high-temperature transmission, and SF6 drying, includes a cylinder sleeve 21, which is fixedly connected inside the insulating sleeve 1. An inner cylinder 22 is slidably connected to the inner wall of the cylinder sleeve 21. A cylinder 23 is fixedly connected to one end of the inner cylinder 22. A contact sleeve 24 is disposed inside the cylinder 23 and fixedly connected to the end of the inner cylinder 22. A piston 25 is fixedly connected to the inner wall of the end of the cylinder 23. A cylinder sleeve 26 is fixedly connected to the inner wall of the insulating sleeve 1. A contact 27 is fixedly connected to the inner wall of the cylinder sleeve 26, and the contact 27 is inserted into the contact sleeve 24. A contact is provided inside the insulating sleeve 1 that is fixedly connected to the cylinder sleeve 26. Layer 28 (Cu-TP2) has a heat-conducting layer 29 (graphene-modified epoxy thermally conductive adhesive) fixedly connected between the contact layer 28 and the inner wall of the insulating sleeve 1. Cylinder 23 is slidably connected to the inner wall of the contact layer 28 and the inner wall of cylinder sleeve 26. One end of the insulating sleeve 1 is provided with a connection terminal 210 fixedly connected to the contact 27. The circuit is connected and carried out. After the fuse melts, the contact sleeve 24 and the contact 27 quickly separate to break the initial circuit. The piston 25 compresses SF6 gas to extinguish the arc, receives the instantaneous high temperature of the fuse melting and transfers it to the heat-conducting layer 29. At the same time, it heats the inner wall of the insulating sleeve 1 to achieve rapid drying of SF6 gas, solving the problems of SF6 drying requiring additional devices and the disconnect between arc extinguishing and high temperature utilization.

[0045] In this embodiment, the reset unit 3 serves as the core triggering component for fuse breaking triggering, mechanical linkage driving, and circuit series connection. It includes a second connection terminal 31, which is fixedly connected to the other end of the insulating sleeve 1. A reset piece 32 is slidably connected to the inner wall of the insulating sleeve 1. A spring 33 is elastically connected between the reset piece 32 and the end of the cylinder sleeve 21 away from the cylinder 23. A support arm 34 is fixedly connected to the reset piece 32 and is also fixedly connected to the other end of the inner cylinder 22. A fuse 35 (lead-tin alloy fuse) is welded to the reset piece 32. The fuse 35 slides through the inner cylinder 22 and passes through the inside of the contact sleeve 24 and is welded to the contact 27. The series connection of the fuse 35 forms a fault breaking triggering node. After the fuse breaks, the energy stored by the spring 33 is released to drive the reset piece 32 to slide, thereby pulling the inner cylinder 22 and the cylinder 23 to separate the contact sleeve 24 and the contact 27. Simultaneously, the second connection terminal 31 is pushed to slide to trigger the unlocking unit 6 to move, thus solving the problems of slow triggering response of the disconnecting mechanism and disordered timing of multi-component linkage.

[0046] It is worth noting that the disconnecting part 5, as the core execution component for high-temperature directional drive of the fuse, unlocking of the ferrule 510, and secondary fuse protection, includes a bracket 51. The bracket 51 is fixedly connected to one of the positioning plates 4. The positioning plate 4 has a through hole 52. The inner wall of the positioning plate 4 is fixedly connected to a mounting plate 53. The mounting plate 53 is connected to a spring plate 1 54 (zinc-copper alloy Zn-Cu) and a spring plate 2 55 (Invar alloy Fe-Ni36) by bolt threads. The spring plate 1 54 and the spring plate 2 55 are welded together and fit against the inner wall of the through hole 52. The disconnecting part 5 also includes a heat insulation plate 56 (silica aerogel heat insulation plate). A heat-conducting plate 57 (T2 copper foil) is fixedly connected between the heat insulation plate 56 and the spring plate 1 54. The heat-conducting plate 57 is fixedly connected to the heat insulation plate 56 by the heat insulation plate 56. The heat-conducting pipe 58 (T2 seamless copper pipe) is fixedly inserted through the insulating sleeve 1 and fixedly connected to the heat-conducting layer 29. A fuse 59 (lead-tin alloy fuse) is welded between the end of the spring 54 and the switch 7. A ferrule 510 is fixedly connected to the bracket 51, and the ferrule 510 is snapped into the switch 7. A hinge arm 511 is hinged between the ferrule 510 and the spring 54. The heat-conducting pipe 58 and the heat-conducting plate 57 receive the high temperature transmitted by the protection part 2. The thermal expansion difference between the spring 54 and the spring 55 is used to achieve directional bending, pull the ferrule 510 to deform and disengage from the switch 7 to release the snap-fit ​​limit, and the fuse 59 is broken by heat and tension to achieve secondary melting protection. This eliminates the connection constraint between the switch 7 and the spring, and solves the problems of uneven heating of the spring, low directional bending accuracy, and unreliable unlocking action.

[0047] It is worth noting that the unlocking part 6, as the core finishing component for the final disconnection, mechanical limit unlocking, and linkage termination of the fuse switch 7, includes a locking plate 61. The locking plate 61 has an L-shaped structure. One end of the locking plate 61 is fixedly sleeved on the end of the connecting terminal 31. A support plate 62 is fixedly connected between the inner walls of the other positioning piece 4 and the support plate 62. A spring 63 is provided on the support plate 62. The support plate 62 is elastically connected to the pressure plate 64 through the spring 63. A push rod 65 is fixedly connected to the pressure plate 64. A bayonet is opened at the other end of the locking plate 61. The locking plate 61 is inserted into the outer wall of the push rod 65 through the bayonet and abuts against the pressure plate 64. The other positioning piece 4 is fixedly... A switch base 66 is fixedly connected, and the end of the push rod 65 slides through the switch base 66. The other end of the switch component 7 is rotatably connected to the inner wall of the switch base 66 and abuts against the through end of the push rod 65. The support 8 is fixedly connected to the bracket 51. The snap-fit ​​end of the switch component 7 and the sleeve 510 is set on the support 8. The locking plate 61 mechanically limits the pressure plate 64 and the push rod 65. After the reset part 3 is triggered, the limit is released. The energy stored in the spring 63 is released to drive the push rod 65 to lift the switch component 7 and push the switch component 7 to rotate around the switch base 66 to achieve complete disconnection. This solves the problems of only initial circuit disconnection without complete disconnection protection and switch component 7 being stuck during reset.

[0048] A method for disconnecting a fuse, according to the aforementioned fuse disconnecting mechanism, includes the following steps:

[0049] S1. The insulating sleeve 1 is connected to the conductive components through the first connection terminal 210 and the second connection terminal 31 to form a complete circuit loop. The first fuse 35 is connected in series in the circuit through the second connection terminal 31, the reset piece 32 and the contact 27.

[0050] S2. When the fuse breaks, the fuse 35 breaks, and the spring 33 overcomes the pressure of the reset piece 32 and pushes the reset piece 32 to slide on the inner wall of the insulating sleeve 1. The reset piece 32 pulls the inner cylinder 22 to slide on the inner wall of the cylinder sleeve 21 through the support arm 34, and at the same time drives the cylinder 23 to slide, causing the contact sleeve 24 to separate from the contact 27. The piston 25 compresses the SF6 gas in the cylinder 23 to fill the separation area to extinguish the arc. When the fuse breaks, the instantaneous high temperature is transferred to the heat-conducting layer 29 through the contact layer 28, and at the same time heats the inner wall of the insulating sleeve 1 to keep the SF6 gas dry.

[0051] S3, the heat-conducting layer 29 transfers heat to the first spring 54 through the heat-conducting pipe 58 and the heat-conducting sheet 57. The heat insulation sheet 56 prevents the rapid loss of heat. The coefficient of thermal expansion of the first spring 54 is greater than that of the second spring 55. The first spring 54 deforms when heated and bends away from the through hole 52 in the direction of the second spring 55. The bending of the first spring 54 pulls the sleeve 510 through the hinge arm 511 to deform and disengage from the end of the switch 7. The second fuse 59 breaks when heated and under the tension of the second spring 55.

[0052] S4 and reset plate 32 synchronously push the second connection terminal 31 to slide. The second connection terminal 31 drives the locking plate 61 to move axially, causing the bayonet to move away from the pressure plate 64. The second spring 63 overcomes the pressure of the pressure plate 64 and drives the top rod 65 to slide and lift the rotating end of the switch 7, causing the switch 7 to rotate around the switch base 66 as the axis, and then causing the switch 7 to lift away from the support 8, thus completing the disconnection.

[0053] Working principle: This device is integrated inside the insulated gate bipolar transistor module. The insulating sleeve 1 is connected to the external conductive components through the first connection terminal 210 and the second connection terminal 31 to form a complete circuit loop. The first fuse 35 is connected in series in the circuit and is the core trigger element for fault melting. The contact sleeve 24 and the contact 27 in the protection part 2 are interlocked to ensure circuit continuity. The first spring 33 in the reset part 3 is in a compressed and energy-storing state, and the second spring 63 in the unlocking part 6 is also compressed and energy-storing. The locking plate 61 is fitted onto the outer wall of the top rod 65 and abuts against the pressure plate 64 to restrict the movement of the top rod 65. The sleeve 510 in the disconnecting part 5 is tightly engaged with the switch 7, and the engaged end of the switch 7 is supported on the support 8. The first spring 54 and the second spring 55 are connected to the switch 7 through the second fuse 59. The entire mechanism is in a closed, ready-to-trigger state.

[0054] When an overload / short circuit fault occurs in the circuit, the fuse 35 breaks instantly, the spring 33 in the reset part 3 releases its stored energy, overcomes the pressure of the reset piece 32 and pushes it to slide on the inner wall of the insulating sleeve 1. The reset piece 32 pulls the inner cylinder 22 to slide on the inner wall of the cylinder sleeve 21 through the support arm 34, and at the same time drives the cylinder 23 to slide synchronously, directly causing the contact sleeve 24 to separate from the contact 27, completing the initial disconnection of the circuit.

[0055] When cylinder 23 slides, piston 25 at its end compresses SF6 gas inside cylinder 23. High-pressure SF6 gas quickly fills the separation area between contact sleeve 24 and contact 27, achieving rapid arc extinguishing. The instantaneous high temperature generated by the melting of fuse 35 is transferred to heat-conducting layer 29 through contact layer 28. Heat-conducting layer 29 transfers the high temperature to the inner wall of insulating sleeve 1, rapidly heating the internal SF6 gas, removing moisture and keeping it dry, thus ensuring the arc extinguishing and insulation performance of SF6.

[0056] The high temperature absorbed by the heat-conducting layer 29 is quickly transferred to the first spring 54 through the heat-conducting pipe 58 and the heat-conducting plate 57. The heat insulation plate 56 effectively prevents the rapid loss of temperature, ensuring that the first spring 54 is heated efficiently. Because the coefficient of thermal expansion of the first spring 54 is much greater than that of the second spring 55, the first spring 54 undergoes plastic deformation when heated, bending towards the second spring 55 and away from the through hole 52 of the positioning plate 4. The directional bending of the first spring 54 causes the sleeve 510 to deform through the hinge arm 511. The sleeve 510 quickly disengages from the snap-fit ​​end of the switch 7, releasing the snap-fit ​​limit on the switch 7. The second fuse 59 is heated by the high temperature and simultaneously breaks under the tension of the second spring 55, eliminating the connection constraint between the switch 7 and the first spring 54, preparing for the rotation and disconnection of the switch 7.

[0057] As the reset plate 32 slides, it simultaneously pushes the second connection terminal 31 to slide along the axial direction of the insulating sleeve 1. The second connection terminal 31 drives the L-shaped locking plate 61 fixedly sleeved at its end to move synchronously. After the locking plate 61 moves, its latch moves away from the pressure plate 64 and disengages from the outer wall of the top rod 65, releasing the contact limit between the pressure plate 64 and the top rod 65. The second spring 63 in the unlocking part 6 releases its stored energy, overcomes the pressure of the pressure plate 64, and pushes it to slide. The pressure plate 64 drives the top rod 65 to slide synchronously. The end of the top rod 65 lifts the rotating end of the switch 7. The switch 7 rotates around the switch base 66 as the axis. Its latching end quickly lifts up and moves away from the support 8, realizing the complete disconnection of the switch 7. Finally, the entire circuit is completely cut off, which is used for short circuit protection of the power semiconductor module.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A fuse tripping mechanism, comprising an insulating sleeve (1), characterized in that: One end of the insulating sleeve (1) is provided with a protective part (2), and the other end of the insulating sleeve (1) is provided with a reset part (3). Both ends of the insulating sleeve (1) are fitted with positioning pieces (4). A disconnection part (5) is installed on the positioning piece (4) at one end of the insulating sleeve (1), and an unlocking part (6) is installed on the positioning piece (4) at the other end of the insulating sleeve (1). A switch (7) is connected between the disconnection part (5) and the unlocking part (6), and a support (8) is installed on the disconnection part (5).

2. The fuse disconnection mechanism according to claim 1, characterized in that: The protective part (2) includes a cylinder sleeve (21), which is fixedly connected inside the insulating sleeve (1). An inner cylinder (22) is slidably connected to the inner wall of the cylinder sleeve (21). A cylinder (23) is fixedly connected to one end of the inner cylinder (22). A contact sleeve (24) is provided inside the cylinder (23) and the contact sleeve (24) is fixedly connected to the end of the inner cylinder (22). A piston (25) is fixedly connected to the inner wall of the end of the cylinder (23). A cylinder sleeve (26) is fixedly connected to the inner wall of the insulating sleeve (1). A contact (27) is fixedly connected to the inner wall of the cylinder sleeve (26). The contact (27) is inserted into the contact sleeve (24).

3. The fuse disconnection mechanism according to claim 2, characterized in that: The insulating sleeve (1) is provided with a contact layer (28) that is fixedly connected to the cylinder liner (26). A heat-conducting layer (29) is fixedly connected between the contact layer (28) and the inner wall of the insulating sleeve (1). The cylinder (23) is slidably connected to the inner wall of the contact layer (28) and to the inner wall of the cylinder liner (26). One end of the insulating sleeve (1) is provided with a connection terminal (210) that is fixedly connected to the contact (27).

4. The fuse disconnection mechanism according to claim 3, characterized in that: The reset part (3) includes a second connection terminal (31), which is fixedly connected to the other end of the insulating sleeve (1). A reset piece (32) is slidably connected to the inner wall of the insulating sleeve (1). A spring (33) is elastically connected between the reset piece (32) and the end of the cylinder sleeve (21) away from the cylinder (23). A support arm (34) is fixedly connected to the reset piece (32), and the support arm (34) is also fixedly connected to the other end of the inner cylinder (22).

5. The fuse disconnection mechanism according to claim 4, characterized in that: A fuse (35) is welded onto the reset piece (32). The fuse (35) slides through the inner cylinder (22) and passes through the inside of the contact sleeve (24) to weld to the contact (27).

6. The fuse disconnection mechanism according to claim 5, characterized in that: The disconnection part (5) includes a bracket (51), which is fixedly connected to one of the positioning pieces (4). The positioning piece (4) has a through hole (52). The inner wall of the positioning piece (4) is fixedly connected to an mounting piece (53). The mounting piece (53) is connected to a spring plate one (54) and a spring plate two (55) by bolt thread. The spring plate one (54) and the spring plate two (55) are welded together. The spring plate one (54) and the spring plate two (55) are attached to the inner wall of the through hole (52).

7. The fuse disconnection mechanism according to claim 6, characterized in that: The disconnection part (5) also includes a heat insulation sheet (56), a heat-conducting sheet (57) is fixedly connected between the heat insulation sheet (56) and the first spring (54), the heat-conducting sheet (57) is fixedly connected to a heat-conducting pipe (58) through the heat insulation sheet (56), the heat-conducting pipe (58) is fixedly connected through the insulating sleeve (1) and fixedly connected to the heat-conducting layer (29), a second fuse (59) is welded between the first spring (54) and the end of the switch (7), a retainer (510) is fixedly connected to the bracket (51), the retainer (510) is snapped into the switch (7), and a hinge arm (511) is hinged between the retainer (510) and the first spring (54).

8. The fuse disconnection mechanism according to claim 7, characterized in that: The unlocking part (6) includes a locking plate (61), which is an L-shaped structure. One end of the locking plate (61) is fixedly sleeved on the end of the connecting terminal (31). A support plate (62) is fixedly connected between the inner walls of the other positioning piece (4). A spring (63) is provided on the support plate (62). A pressure plate (64) is elastically connected to the support plate (62) through the spring (63). A top rod (65) is fixedly connected to the pressure plate (64). A bayonet is provided at the other end of the locking plate (61). The locking plate (61) is inserted into the outer wall of the top rod (65) through the bayonet and abuts against the pressure plate (64). A switch base (66) is fixedly connected to the other positioning piece (4). The end of the top rod (65) slides through the switch base (66).

9. The fuse disconnection mechanism according to claim 8, characterized in that: The other end of the switch (7) is rotatably connected to the inner wall of the switch base (66) and abuts against the through end of the top rod (65). The support (8) is fixedly connected to the bracket (51). The snap-fit ​​end of the switch (7) and the sleeve (510) is set on the support (8).

10. A method for disconnecting a fuse, wherein the fuse disconnecting mechanism according to claim 9 is characterized in that, Includes the following steps: S1. The insulating sleeve (1) is connected to the conductive components through the connecting terminal one (210) and the connecting terminal two (31) to form a complete circuit loop. The fuse one (35) is connected in series in the circuit through the connecting terminal two (31), the reset piece (32) and the contact (27). S2. When the fuse breaks, the first fuse (35) breaks, the first spring (33) overcomes the pressure of the reset piece (32) and pushes the reset piece (32) to slide on the inner wall of the insulating sleeve (1). The reset piece (32) pulls the inner cylinder (22) to slide on the inner wall of the cylinder sleeve (21) through the support arm (34), and at the same time drives the cylinder (23) to slide, causing the contact sleeve (24) to separate from the contact (27). The piston (25) compresses the SF6 gas in the cylinder (23) to fill the separation area to extinguish the arc. When the fuse breaks, the instantaneous high temperature is transferred to the heat-conducting layer (29) through the contact layer (28), and at the same time heats the inner wall of the insulating sleeve (1) to keep the SF6 gas dry. S3, the heat-conducting layer (29) transfers heat to the first spring (54) through the heat-conducting pipe (58) and the heat-conducting sheet (57). The heat insulation sheet (56) prevents the rapid loss of heat. The coefficient of thermal expansion of the first spring (54) is greater than that of the second spring (55). The first spring (54) deforms when heated and bends away from the through hole (52) in the direction of the second spring (55). The first spring (54) bends and pulls the sleeve (510) through the hinge arm (511) to deform and disengage from the end of the switch (7). The second fuse (59) is heated and breaks under the tension of the second spring (55). S4. The reset plate (32) synchronously pushes the second connecting terminal (31) to slide. The second connecting terminal (31) drives the locking plate (61) to move axially, causing the bayonet to move away from the pressure plate (64). The second spring (63) overcomes the pressure of the pressure plate (64) and drives the top rod (65) to slide and lift the rotating end of the switch (7), causing the switch (7) to rotate around the switch base (66) as the axis, thereby causing the switch (7) to lift away from the support (8) and complete the disconnection.

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