Compact excitation fuse structure

Abstract

The utility model belongs to the field of electric power control and electric automobiles, and particularly relates to a compact excitation fuse structure which comprises a shell, an electronic ignition device, a piston structure and a busbar, the busbar is arranged at one end of the shell in a penetrating mode, and the piston structure and the electronic ignition device are located in the shell on the same side of the busbar; the electronic ignition device is located beside the displacement path of the piston structure. The piston structure comprises a piston rod, a clamping end and a driving end, the clamping end and the driving end are located at the two ends of the piston rod, the clamping end is clamped and fixed to the portion, needing to be disconnected, of the busbar, the end face, facing the busbar and located on the peripheral face of the piston rod, of the driving end serves as a stress face, and high-pressure gas released by the electronic ignition device directly acts on the stress face of the piston structure or acts on a horizontal moving part. And the piston structure is driven to displace, and the busbar is snapped from the to-be-broken part of the busbar. According to the excitation fuse structure, the structure form that the busbar is arranged at the bottom of the shell is met, the electronic ignition device and the piston structure are arranged on the same side of the busbar, the structure is more compact, and the space utilization rate is increased.

Description

Technical Field

[0001] This invention belongs to the field of power control and electric vehicles, and specifically relates to an excitation fuse structure for circuit protection that mechanically disconnects the main circuit. Background Technology

[0002] As a protective device for circuit systems, an excitation fuse mainly consists of an electronic ignition device, a piston, a busbar, and an arc-extinguishing fusible element connected in parallel to the busbar. Typically, the electronic ignition device and piston are located sequentially on the same side of the busbar, with the piston positioned between the electronic ignition device and the busbar, and the arc-extinguishing fusible element on the other side. The high-pressure gas generated by the explosion of the electronic ignition device drives the piston to move towards the busbar. The kinetic energy from the piston's linear displacement cuts off the busbar, and then the arc-extinguishing fusible element. Because the driving force generated by the electronic ignition device is in the same direction as the piston's movement, after the busbar is disconnected, the piston needs to continue moving a certain distance to maintain sufficient insulation distance between the disconnected part of the busbar and the main body, while also reducing the piston's kinetic energy. Because the electronic ignition device, piston, busbar, and arc-extinguishing fusible element are arranged sequentially in the piston's displacement direction, and sufficient linear displacement space for the piston, sufficient insulation distance after the busbar is disconnected, and displacement space required for the arc-extinguishing fusible element to disconnect are required, the existing excitation fuses on the market have a relatively large structural volume. Summary of the Invention

[0003] The purpose of this invention is to provide a compact excitation fuse structure. By changing the direction of the driving force generated by the electronic ignition device, the thrust of the driving piston structure to disconnect the busbar is changed to the pulling force of the driving piston structure to disconnect the busbar, thus breaking the busbar. This makes the piston structure, electronic ignition device, etc., all located on the same side of the busbar, making the excitation fuse structure more compact.

[0004] To achieve the above objectives, the present invention provides a compact excitation fuse structure, comprising a housing with a cavity, an electronic ignition device, a piston structure, and a busbar. The busbar passes through one end of the housing, with both ends of the busbar located outside the housing. The piston structure and the electronic ignition device are respectively located in the cavity within the housing on the same side of the busbar. The electronic ignition device is located on the side wall of the housing beside the displacement path of the piston structure, and one end of the electronic ignition device that releases high-pressure gas is located in the cavity of the housing. The piston structure includes a piston rod and clamping ends and driving ends located at both ends of the piston rod. The clamping ends clamp and fix the part of the busbar to be disconnected. A space is reserved in the cavity of the housing for the driving end and the clamping end to... The displacement space of the holding end; the end face of the driving end facing the clamping end and located on the outer periphery of the piston rod serves as the force-bearing surface; when the electronic ignition device releases high-pressure gas, the high-pressure gas acts directly on the force-bearing surface of the driving end, or the high-pressure gas acts on the force-bearing surface through a horizontal moving member, driving the piston structure to displace away from the busbar, pulling off the busbar from the part that needs to be disconnected; when the high-pressure gas acts directly on the force-bearing surface of the driving end, the cavity where the force-bearing surface is located is connected to the cavity where the high-pressure gas release end of the electronic ignition device is located and forms a sealed cavity; when the high-pressure gas acts on the force-bearing surface through the horizontal moving member, the cavity between the horizontal moving member and the electronic ignition device is connected and forms a sealed cavity.

[0005] Preferably, the horizontal moving component is located between the piston structure and the electronic ignition device, and the displacement direction of the horizontal moving component is perpendicular to the displacement direction of the piston structure; the horizontal moving component and the force-bearing surface are engaged with an inclined structure; the electronic ignition device releases high-pressure gas to drive the horizontal moving component to linear displacement, and the horizontal moving component drives the piston structure to linear displacement away from the busbar through the engaged inclined structure.

[0006] Preferably, the end face of the piston structure facing the clamping end is configured as a first inclined surface as the force-bearing surface, and the end of the horizontal moving member facing the driving end is provided with a second inclined surface that cooperates with the first inclined surface. A U-shaped groove is provided at the end of the horizontal moving member facing the piston structure. When the first inclined surface and the second inclined surface cooperate, the piston rod is located in the U-shaped groove, and the U-shaped groove can be displaced relative to the piston rod. When the horizontal moving member is displaced, the second inclined surface acts on the first inclined surface, driving the piston structure to displace.

[0007] Preferably, support blocks are provided in the cavities of the housing on opposite sides of the piston structure to support the horizontal moving part that is displaced into the cavity where the piston structure is located.

[0008] Preferably, an elastic and insulating seal is provided between the part of the busbar to be disconnected and the end of the housing where it is located. The seal is positioned directly opposite the part of the busbar to be disconnected and is fixedly mounted on the part of the busbar to be disconnected. When the piston structure is displaced, causing the part of the busbar to be disconnected to break off from the busbar body and move away from the busbar body, the seal is simultaneously displaced and locked onto the break point on the busbar, thus insulating the break point.

[0009] Preferably, the sealing element has a frustum structure.

[0010] Preferably, the sealing element is an elastic C-shaped strip structure, with several grooves and protrusions spaced apart along its length on the end face away from the busbar. The strip-shaped sealing element is perpendicular to the busbar. When the sealing element is displaced and locked at the break, the grooves and protrusions of the sealing element coincide.

[0011] Preferably, an arc-extinguishing device is provided between the driving end of the piston structure and the housing end away from the busbar. The arc-extinguishing device includes an arc-extinguishing chamber and a melt. A displacement channel is provided in the displacement direction of the piston structure in the arc-extinguishing chamber. An arc-extinguishing medium is filled in the arc-extinguishing chamber outside the displacement channel. The melt passes through the arc-extinguishing medium and through the displacement channel. The two ends of the melt are electrically connected to the busbar portions located on opposite sides of the clamping end of the piston structure, so that the melt is connected in parallel on the busbar. A melt disconnecting device is fixedly provided on the end face of the driving end of the piston structure facing the arc-extinguishing device. The melt disconnecting device is provided corresponding to the displacement channel. When the piston structure is displaced, the melt disconnecting device is displaced along the displacement channel. When the busbar is disconnected, the melt disconnecting device disconnects the melt.

[0012] Preferably, the clamping end of the piston structure is integrally injection molded with the busbar.

[0013] Preferably, when the high-pressure gas released by the electronic ignition device directly acts on the force-bearing surface of the drive end, the cavities between the drive end, the clamping end, and the high-pressure gas release end of the electronic ignition device are interconnected and form a sealed cavity; the force-bearing surface of the drive end located on the outer periphery of the piston rod is larger than the area of ​​the end face of the clamping end located on the outer periphery of the piston rod facing the drive end, and satisfies the condition that when the high-pressure gas released by the electronic ignition device acts on the end face of the drive end and the end face of the clamping end respectively, the high-pressure gas drives the piston structure to move away from the busbar, disconnecting the busbar.

[0014] Preferably, the end of the piston rod furthest from the drive end replaces the clamping end and clamps the part of the busbar that needs to be disconnected.

[0015] The excitation fuse structure of the present invention satisfies the structural form of the busbar being arranged at the bottom of the housing, and the electronic ignition device, piston structure and arc extinguishing device are all arranged on the same side of the busbar, making the structure more compact and increasing space utilization.

[0016] By cooperating with the inclined surface of the piston structure through the horizontal moving parts, the thrust is converted into the piston's pulling force, reducing the space requirement at the bottom of the housing.

[0017] The arc-extinguishing device is positioned at the end of the casing away from the busbar, ensuring that the arc extinguishing device is far from the busbar break point and does not interfere with each other. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure.

[0019] Figure 2 This is a schematic diagram of the main view structure.

[0020] Figure 3 This is a schematic diagram of the piston structure and the horizontal moving parts in the initial position.

[0021] Figure 4 This is a schematic diagram of the piston structure and the horizontal moving parts at the termination position.

[0022] Figure 5 This is a schematic diagram showing the structural relationship between the piston structure and the busbar, which are integrally injection molded.

[0023] Figure 6 This is a schematic diagram of the horizontal moving parts.

[0024] Figure 7 This is a schematic diagram of a sealing component with a frustum-shaped structure.

[0025] Figure 8 This is a schematic diagram of a C-shaped strip-shaped sealing component.

[0026] Figure 9 This is a schematic diagram of the frustum-shaped seal and piston structure in the initial position.

[0027] Figure 10 This is a schematic diagram of the frustum-shaped seal and piston structure at the termination position.

[0028] Figure 11 This is a schematic diagram of the structure between the C-shaped strip-shaped seal, the piston structure, and the housing in the initial position.

[0029] Figure 12 This is a schematic diagram of the C-shaped strip-shaped seal and piston structure in the initial position.

[0030] Figure 13 This is a schematic diagram of the C-shaped strip-shaped seal and piston structure when in the termination position.

[0031] Figure 14 This is a schematic diagram of a piston structure that only includes the piston structure.

[0032] Figure label:

[0033] Housing 100, busbar 101, horizontal moving part 102, piston structure 103, electronic ignition device 104, piston rod 105, drive end 106, clamping end 107, first inclined surface structure 108, melt disconnection device 109, second inclined surface structure 110, U-shaped groove structure 111, support block 112, sealing element 113, arc extinguishing device 114, groove structure 115, piston structure 116, clamping end 117, drive end 118, force-bearing surface 119. Detailed Implementation

[0034] This invention discloses a compact excitation fuse structure, comprising a housing with a cavity, an electronic ignition device, a piston structure, and a busbar. The busbar passes through one end of the housing, with both ends located outside the housing. The piston structure and the electronic ignition device are respectively located in cavities within the housing on the same side of the busbar. The electronic ignition device is located on the sidewall of the housing beside the displacement path of the piston structure, with one end of the electronic ignition device releasing high-pressure gas located in the cavity of the housing. The piston structure includes a piston rod and clamping ends and driving ends located at both ends of the piston rod. The clamping ends are clamped and fixed to the portion of the busbar to be disconnected. Displacement space is reserved within the cavity of the housing for the displacement of the driving end and the clamping ends. The drive end face facing the clamping end and located on the outer periphery of the piston rod serves as the force-bearing surface. When the electronic ignition device releases high-pressure gas, the high-pressure gas acts directly on the force-bearing surface of the drive end, or the high-pressure gas acts on the force-bearing surface through a horizontal moving part, driving the piston structure to move away from the busbar and pulling off the busbar from the part that needs to be disconnected. When the high-pressure gas acts directly on the force-bearing surface of the drive end, the cavity where the force-bearing surface is located is connected to the cavity where the high-pressure gas is released from the electronic ignition device, forming a sealed cavity. When the high-pressure gas acts on the force-bearing surface through a horizontal moving part, the cavity between the horizontal moving part and the electronic ignition device is connected, forming a sealed cavity.

[0035] The following describes preferred embodiments in detail with reference to the accompanying drawings. The directional terms used are for reference only and do not constitute a limitation on the technical solution of this invention.

[0036] The excitation fuse structure of the present invention is shown in the figure. Figures 1 to 13 The device includes a housing, within which are housed a busbar, an electronic ignition device, a piston structure, and an arc-extinguishing device. The sub-ignition device, piston structure, and arc-extinguishing device are all located on the same side of the housing as the busbar. Wherein:

[0037] The housing 100 is made of insulating material and contains a vertical cavity, a horizontal cavity, a sealing element housing cavity, and an arc-extinguishing device housing cavity. The sealing element housing cavity and the arc-extinguishing device housing cavity are located at opposite ends of the housing 100. The vertical cavity and the horizontal cavity are located between the sealing element housing cavity and the arc-extinguishing device housing cavity, respectively. The vertical cavity is located on one side of the horizontal cavity. The vertical cavity and the horizontal cavity are interconnected, but the vertical cavity is isolated from the arc-extinguishing device housing cavity.

[0038] Busbar 101, made of conductive material, is installed at the bottom of the housing 100 and passes through the vertical cavity within the housing 100. The two ends of busbar 101 located outside the housing 100 serve as terminals. A gap is maintained between busbar 101 and the bottom of the housing 100 to form a sealing cavity. The portion of busbar 101 located within the vertical cavity is the disconnectable portion. Notches are formed on opposite sides of the busbar 101 within the vertical cavity to facilitate clamping by the piston structure. To facilitate disconnection of the disconnectable portion, a mechanically weak point is provided at the disconnectable portion, such as a hollow structure, a thinned structure, or a groove structure. For ease of installation, the housing 100 can be divided into several interconnected parts.

[0039] Piston structure 103, see Figure 3 and Figure 4 In the vertical cavity of the housing 100 located on one side of the busbar 101, the piston structure 103 moves linearly along the vertical cavity under the drive of an external force. A horizontal moving component 102 is disposed in a horizontal cavity within the housing 100, and the horizontal moving component 102 is in sealed contact with the horizontal cavity. The horizontal moving component 102 and the piston structure 103 are configured to cooperate via an inclined surface structure. Under the action of a driving force, the horizontal moving component 102 moves linearly along the horizontal cavity. An electronic ignition device 104 is disposed on the side wall of the housing at the end of the horizontal cavity away from the vertical cavity. The high-pressure gas release end of the electronic ignition device 104 is located in the horizontal cavity within the housing 100, placing the horizontal moving component 102 between the electronic ignition device 104 and the piston structure 103. The signal receiving end of the electronic ignition device 104 is located outside the housing 100, and can receive external trigger signals for activation. The electronic ignition device 104 operates according to the received trigger signal, releasing high-pressure gas. The high-pressure gas drives the horizontal moving part 102 to move towards the piston structure 103. Through the matching inclined structure, the horizontal moving part 102 drives the piston structure 103 to move linearly.

[0040] Piston structure 103, see Figure 5 The material is engineering plastic, such as PA66, or other insulating materials. The piston structure 103 includes a piston rod 105, and a drive end 106 and a clamping end 107 located at both ends of the piston rod 105 and integrally formed with the piston rod 105.

[0041] The clamping end 107 clamps the part of the busbar 101 that needs to be disconnected. For example, a U-shaped groove is provided at the clamping end 107, and the part of the busbar that needs to be disconnected is located in the U-shaped groove of the clamping end 107, thus clamping the part of the busbar that needs to be disconnected. The clamping end 107 and the part of the busbar that needs to be disconnected are integrally injection molded, or the part of the busbar that needs to be disconnected is fixed to the clamping end 107 by a fastener, which can be a pin.

[0042] The driving end 106 protrudes beyond the outer periphery of the piston rod 105 at one end facing the clamping end 107, and the end face of the driving end 106 facing the clamping end 107 is configured as a first inclined surface structure 108 as a force-bearing surface. The inclination angle of the first inclined surface structure 108, i.e., the angle between the first inclined surface structure and the horizontal plane, is preferably 30° to 60°, with 45° being preferable. A melt-cutting device 109 is provided at the end of the driving end 106 away from the piston rod 105. The melt-cutting device 109 includes two cutters arranged parallel to each other on the driving end 106. The cross-section of the piston rod 105 is preferably a slotted cross-section structure or an elliptical cross-section structure.

[0043] An arc-extinguishing device 114 is housed in an arc-extinguishing device receiving cavity at the top of a housing 100 located away from the busbar 101. This receiving cavity is adjacent to and insulated from a vertical cavity. The arc-extinguishing device includes a sealed arc-extinguishing chamber filled with an arc-extinguishing medium. A displacement channel is provided within the arc-extinguishing chamber, separated from the arc-extinguishing medium. A molten element passes through the arc-extinguishing medium and the displacement channel. Both ends of the molten element pass through the outer side of the housing 100 of the piston structure's displacement path and are electrically connected to the busbar 101, thus connecting the molten element in parallel to the busbar 101. The two ends of the molten element connected to the busbar are located on the outer sides of the portion of the busbar to be disconnected. When the busbar 101 is disconnected from the portion to be disconnected, the current flowing through the busbar 101 flows through the molten element. The resistance of the molten element is much greater than the resistance of the busbar 101; under normal operating conditions, the current flowing through the molten element is negligible. Two cutters of the melt disconnecting device pass through the vertical cavity and enter the receiving cavity of the arc extinguishing device. In the initial position, the free ends of the cutters extend into the displacement channel. When the piston structure 103 moves, the melt disconnecting device 109 moves along the displacement channel, disconnecting the melt. The arc extinguishing device 114 can be manufactured as a separate independent component, which facilitates installation and reduces the number of parts. In this embodiment, an arc extinguishing device is provided. In some embodiments, when the arc generated by the busbar disconnection is small and can be directly extinguished by the air medium, an arc extinguishing device may not be required.

[0044] Horizontal moving part 102, see Figure 6The material is engineering plastic or metal, with engineering plastic being PA66, POM, or others. The end of the horizontal moving component 102 facing the piston structure 103 is configured as a second inclined surface structure 110, the inclination angle of the second inclined surface structure 110 being complementary to the inclination angle of the first inclined surface structure 108. A U-shaped groove structure 111 is formed at the position of the horizontal moving component 102 corresponding to the piston rod 105, the U-shaped groove structure 111 penetrating one end face of the second inclined surface structure 110. The end of the horizontal moving component 102 facing the electronic ignition device 104 achieves a tight seal with the inner wall of the horizontal cavity. Guide protrusions are provided on opposite sides of the horizontal moving component 102, and guide grooves are provided at corresponding positions on opposite sides of the inner wall of the horizontal cavity. The guide protrusions of the horizontal moving component 102 are slidably disposed in the guide grooves, ensuring that the horizontal moving component 102 can make linear displacement along the guide grooves. Of course, the horizontal moving part 102 may not have a guide ridge. This can be achieved by designing the horizontal cavity and the external structure of the horizontal moving part 102. The external structure only needs to be able to limit the rotation of the horizontal moving part; for example, its cross-section cannot be circular. In the initial position, the U-shaped groove of the horizontal moving part 102 is located on the opposite outer sides of the piston rod 105 of the piston structure 103. The first inclined surface structure 108 is fitted onto the second inclined surface structure 110, forming a large contact area, reducing the pressure at the mating inclined surface, and relying on the support of the support block of the bottom shell, when the horizontal moving part moves linearly, it pushes the piston structure to move away from the mother row.

[0045] To ensure the horizontal position of the horizontal moving part 102, support blocks 112 are respectively provided on the housing 100 on both sides of the piston structure in the vertical cavity of the housing 100 to support the horizontal displacement of the horizontal moving part in the vertical cavity.

[0046] A resilient sealing element 113 is provided in the cavity between the busbar 101 and the bottom end of the housing, see reference. Figures 7 to 13In this embodiment, the busbar 101 has a U-shaped structure forming a groove structure 115. The bottom of the groove structure 115 is the part of the busbar that needs to be disconnected. A sealing cavity for accommodating the sealing element 113 is formed between the groove structure 115 and the bottom end of the housing. This structure of the busbar 101 saves internal space of the housing and makes the part of the busbar that needs to be disconnected and the two ends of the busbar 101 not on the same plane. During assembly, it can better prevent relative displacement between the busbar 101 and the housing 100. The sealing element 113 is positioned directly opposite the part of the busbar that needs to be disconnected. The sealing element 113 is fixedly connected to the clamping end 107 of the piston structure 103 and the conductive part that needs to be disconnected, for example, by screws. The seal 113 can move with the piston structure 103. After the busbar is disconnected, the seal 113 will move to the break point of the busbar to form a good seal, interrupting the electric arc at the break point and improving the insulation performance at the break point. Therefore, the seal 113 is made of an elastic insulating material. The structure of the seal 113 is preferably a frustum-shaped or C-shaped strip structure, and the material is preferably engineering plastic (PA66 or others) or rubber.

[0047] See Figure 7 When the seal 113 is a frustum structure, its material is engineering plastic. The maximum outer diameter of the frustum structure is greater than the maximum distance of the break formed on the busbar after the part of the busbar that needs to be disconnected is separated from the busbar.

[0048] See Figure 8 When the seal 113 is a C-shaped strip structure, it is made of highly elastic rubber. Several C-shaped grooves are spaced apart along the length of the seal 113 on the end face facing the bottom of the housing, with a protrusion formed between adjacent C-shaped grooves. The width of the seal 113 is slightly larger than the break formed by the motherboard. When the seal 113 is lifted and locked into the break formed by the motherboard by the piston structure, the C-shaped strip structure of the seal 113 undergoes elastic deformation. The C-shaped grooves and protrusions overlap; that is, after elastic deformation, the protrusions are squeezed into the C-shaped grooves, forming a good sealing effect.

[0049] In the above embodiments, the electronic ignition device, piston structure, horizontal moving part, and arc extinguishing device are all located in the housing on the same side of the busbar, making the structure more compact.

[0050] Working principle:

[0051] During normal operation, current flows through the busbar.

[0052] When the electronic ignition device operates according to the received trigger signal, it releases high-pressure gas as a driving force. The high-pressure gas drives the horizontal moving part 102 to move horizontally. Under the action of the inclined structure's resistance displacement, it pushes the piston structure 103 to move away from the busbar 101, so that the piston structure 103, along with the part of the busbar to be disconnected, breaks off from the busbar 101, forming a break on the busbar 101. The piston structure 103 drives the sealing element 113 to move towards the break position of the busbar 101 and positions the sealing element 113 between the break points of the busbar, forming a good seal and blocking the electric arc at the break point. At the same time, when the busbar is disconnected, the current flows through the molten metal 114. The piston structure 103 drives the molten metal disconnection device to move along the displacement channel of the arc extinguishing device, disconnecting the molten metal, extinguishing the arc, and completely disconnecting the main circuit.

[0053] In the above embodiment, the piston structure uses a piston structure and a horizontal moving part to cooperate with an inclined plane to convert the horizontal force into a vertical force, driving the piston structure to break the busbar and realize the busbar disconnection.

[0054] In other embodiments, the horizontal moving component can be removed, and the system can be implemented solely by the piston structure. In this case, the vertical cavity and the horizontal cavity are connected and form a sealed cavity. When relying solely on the piston structure, the piston structure is slightly modified; see [link to documentation]. Figure 14 The piston structure 116 is disposed in a vertical cavity. The clamping end 117 and the driving end 118 of the piston structure 116 are in sealed contact with the vertical cavity of the housing 100. The end of the driving end 118 facing the clamping end 117 is configured as a planar structure on the outer periphery of the piston rod 105 as a force-bearing surface 119. The area of ​​the end face of the clamping end 117 on the outer periphery of the piston rod 105 is smaller than the area of ​​the force-bearing surface 119, so that the force acting on the force-bearing surface 119 is greater than the force acting on the end face of the clamping end 117, ensuring that the piston structure displaces away from the busbar under the action of the force, breaking the busbar; or, the area of ​​the end face of the clamping end 117 on the outer periphery of the piston rod 105 is zero, and one end of the piston rod 105 is directly used to replace the driving end. This allows the high-pressure gas to act directly on the force-bearing surface 119, making the force acting on the clamping end zero.

[0055] The high-pressure gas released by the electronic ignition device 104 can enter the vertical cavity through the horizontal cavity, and then act on the force-bearing surface of the drive end, driving the piston structure 116 to move away from the busbar 101. The clamping end carries the part of the busbar that needs to be disconnected from the busbar and away from the busbar body, forming an insulating distance between it and the busbar body. At the same time, it drives the sealing element to move, so that the sealing element is located in the busbar break, forming a good seal at the break and blocking the electric arc at the break.

[0056] To meet the requirement of high-pressure gas driving piston displacement, the area of ​​the force-bearing surface protruding from the outer circumference of the piston rod at the driving end needs to be large enough so that the force applied to the force-bearing surface is sufficient to drive the piston displacement. In addition, the area of ​​the end face of the clamping end located on the outer circumference of the piston rod should be very small, or the end of the piston rod facing the motherboard should be directly used as the clamping end to avoid high-pressure gas acting on the clamping end, forming a reverse force, and affecting the displacement of the piston structure.

Claims

1. A compact excitation fuse structure, characterized in that, The device includes a housing with cavities, an electronic ignition device, a piston structure, and a busbar. The busbar passes through one end of the housing, with both ends located outside the housing. The piston structure and the electronic ignition device are located in the cavities within the housing on the same side of the busbar. The electronic ignition device is located on the sidewall of the housing beside the displacement path of the piston structure, with one end of the electronic ignition device releasing high-pressure gas located in the cavity of the housing. The piston structure includes a piston rod and clamping ends and driving ends located at both ends of the piston rod. The clamping ends are clamped and fixed to the part of the busbar that needs to be disconnected. Displacement space is reserved in the cavity of the housing for the driving end and the clamping ends to move. The drive end face facing the clamping end and located on the outer periphery of the piston rod serves as the force-bearing surface. When the electronic ignition device releases high-pressure gas, the high-pressure gas acts directly on the force-bearing surface of the drive end, or the high-pressure gas acts on the force-bearing surface through a horizontal moving member, driving the piston structure to displace away from the busbar, pulling off the busbar from the part that needs to be disconnected. When the high-pressure gas acts directly on the force-bearing surface of the drive end, the cavity where the force-bearing surface is located communicates with the cavity where the high-pressure gas release end of the electronic ignition device is located and forms a sealed cavity. When the high-pressure gas acts on the force-bearing surface through the horizontal moving member, the cavity between the horizontal moving member and the electronic ignition device communicates and forms a sealed cavity.

2. The excitation fuse structure according to claim 1, characterized in that, The horizontal moving component is located between the piston structure and the electronic ignition device, and the displacement direction of the horizontal moving component is perpendicular to the displacement direction of the piston structure; the horizontal moving component and the force-bearing surface are engaged with an inclined structure; the electronic ignition device releases high-pressure gas to drive the horizontal moving component to linear displacement, and the horizontal moving component drives the piston structure to linear displacement away from the busbar through the engaged inclined structure.

3. The excitation fuse structure according to claim 2, characterized in that, The driving end of the piston structure facing the clamping end is configured as a first inclined surface as the force-bearing surface. The end of the horizontal moving member facing the driving end is provided with a second inclined surface that cooperates with the first inclined surface. A U-shaped groove is provided at the end of the horizontal moving member facing the piston structure. When the first inclined surface and the second inclined surface cooperate, the piston rod is located in the U-shaped groove, and the U-shaped groove can be displaced relative to the piston rod. When the horizontal moving member is displaced, the second inclined surface acts on the first inclined surface, driving the piston structure to displace.

4. The excitation fuse structure according to claim 3, characterized in that, Support blocks are provided in the cavities of the housing on opposite sides of the piston structure to support the horizontal moving part that is displaced into the cavity where the piston structure is located.

5. The excitation fuse structure according to claim 1, characterized in that, An elastic and insulating seal is provided between the part of the busbar to be disconnected and the end of the housing where it is located. The seal is positioned directly opposite the part of the busbar to be disconnected and is fixedly mounted on the part of the busbar to be disconnected. When the piston structure is displaced, causing the part of the busbar to be disconnected to break off from the busbar body and move away from the busbar body, the seal is simultaneously displaced and locked onto the break point on the busbar, thus insulating the break point.

6. The excitation fuse structure according to claim 5, characterized in that, The sealing element has a frustum structure.

7. The excitation fuse structure according to claim 5, characterized in that, The sealing element is a C-shaped strip structure with elasticity. Several grooves and protrusions are provided at intervals along its length on the end face away from the busbar. The strip-shaped sealing element is arranged perpendicular to the busbar. When the sealing element is displaced and stuck at the break, the grooves and protrusions of the sealing element coincide.

8. The excitation fuse structure according to claim 1, characterized in that, An arc-extinguishing device is provided between the driving end of the piston structure and the end of the housing away from the busbar. The arc-extinguishing device includes an arc-extinguishing chamber and a molten material. A displacement channel is provided in the displacement direction of the piston structure in the arc-extinguishing chamber. An arc-extinguishing medium is filled in the arc-extinguishing chamber outside the displacement channel. The molten material passes through the arc-extinguishing medium and through the displacement channel. The two ends of the molten material are electrically connected to the busbar portions located on opposite sides of the clamping end of the piston structure, so that the molten material is connected in parallel on the busbar. A molten material disconnecting device is fixedly provided on the end face of the driving end of the piston structure facing the arc-extinguishing device. The molten material disconnecting device is provided corresponding to the displacement channel. When the piston structure is displaced, the molten material disconnecting device is displaced along the displacement channel. When the busbar is disconnected, the molten material disconnecting device disconnects the molten material.

9. The excitation fuse structure according to claim 1, characterized in that, The clamping end of the piston structure is integrally injection molded with the busbar.

10. The excitation fuse structure according to any one of claims 1, 5 to 9, characterized in that, When the high-pressure gas released by the electronic ignition device directly acts on the force-bearing surface of the drive end, the cavities between the drive end, the clamping end, and the high-pressure gas release end of the electronic ignition device are interconnected and form a sealed cavity. The force-bearing surface of the driving end located on the outer periphery of the piston rod is larger than the area of ​​the end face of the clamping end located on the outer periphery of the piston rod facing the driving end, and satisfies the condition that when the high-pressure gas released by the electronic ignition device acts on the end face of the driving end and the end face of the clamping end respectively, the high-pressure gas drives the piston structure to move away from the busbar and disconnect the busbar.

11. The excitation fuse structure according to claim 10, characterized in that, The end of the piston rod furthest from the drive end replaces the clamping end and clamps the part of the busbar that needs to be disconnected.

Images