Explosion-proof capacitor with insulation protection function
By setting an insulating block and elastic components at the bottom of the explosion-proof block, the problem of insufficient insulation protection of existing capacitors during the explosion-proof process is solved, achieving electrical and thermal isolation, and improving the safety and assembly efficiency of the capacitor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENG YE ELECTRIC CO LTD
- Filing Date
- 2025-05-21
- Publication Date
- 2026-05-08
AI Technical Summary
In the current process of explosion-proofing capacitors, there is no insulation protection between the explosion-proof solder joints and the internal core of the capacitor, which can easily lead to short circuits, thermal runaway, and physical impacts that could damage the core.
An insulating block is installed at the bottom of the explosion-proof block to separate the explosion-proof solder joints from the capacitor core, achieving electrical isolation. The design of elastic components and positioning blocks prevents the transmission of high temperatures and the effects of physical impacts.
This achieves insulation protection for the capacitor, blocks the transmission of high temperatures and physical impacts, prevents damage to the core, and improves assembly efficiency and safety.
Smart Images
Figure CN224217360U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of capacitor technology, specifically to an explosion-proof capacitor that provides insulation protection. Background Technology
[0002] This section provides only background information related to this application to enable those skilled in the art to understand this application more thoroughly and accurately, and it is not necessarily prior art.
[0003] When existing capacitors malfunction due to manufacturing processes, working environment, poor ventilation, or other factors, excessive gas may be generated inside. When the internal gas pressure becomes too high, the capacitor will bulge and explode. Current explosion-proof designs typically involve placing an explosion-proof block between the capacitor core and the cover plate. The capacitor's leads are fixed to the cover plate mounting base by a rivet, with the other end of the rivet passing through the explosion-proof block and welded to a metal plate mounted on it. Therefore, when the capacitor core experiences permanent breakdown, the generated gas and temperature will cause the internal gas pressure to rise. This pressure acts on the easily deformable cover plate, causing it to bulge upwards, eventually breaking the explosion-proof weld between the rivet and the metal plate, creating an open circuit inside the capacitor and achieving the explosion-proof effect.
[0004] However, in existing capacitors, since there is no insulating protection structure between the explosion-proof solder joints and the internal core of the capacitor, the following disadvantages are likely to occur: First, during the explosion-proof process, the two are prone to short circuit due to accidental conduction; Second, during the explosion-proof process, high temperature can easily be transferred from the explosion-proof solder joints to the core, thereby causing a thermal runaway chain reaction; Third, during the explosion-proof process, the physical impact generated by the second metal sheet can easily affect the core. Utility Model Content
[0005] To overcome the deficiencies described in the prior art, this utility model provides an explosion-proof capacitor that provides insulation protection. By setting an insulating block at the bottom of the explosion-proof block, the insulating block can separate the explosion-proof solder joint from the capacitor core, thereby achieving electrical isolation between the two and thus playing the role of insulation protection. In addition, the insulating block can also block the transmission of high temperature from the explosion-proof solder joint to the core and prevent the physical impact of the second metal sheet from affecting the core, thereby playing the role of thermal isolation and mechanical isolation.
[0006] The technical solution adopted by this utility model to solve its problem is:
[0007] An explosion-proof capacitor providing insulation protection includes:
[0008] Explosion-proof blocks are used to install inside the casing of capacitors;
[0009] A cover plate for sealing the opening of the capacitor's housing; the cover plate is located above the explosion-proof block;
[0010] An electrical connection assembly includes a first metal sheet disposed on the cover plate, a second metal sheet disposed on the explosion-proof block, and a conductive rod passing through the cover plate and the explosion-proof block respectively. One end of the conductive rod is welded and fixed to the first metal sheet, and the other end is welded and fixed to the second metal sheet to form an explosion-proof solder joint.
[0011] It also includes an insulating block disposed at the bottom of the explosion-proof block and located below the second metal sheet, the insulating block being used to separate the explosion-proof solder joint from the capacitor core.
[0012] Furthermore, the insulating block and the explosion-proof block are fixed together by riveting, screwing, or hot-melt methods.
[0013] Furthermore, the explosion-proof block is also provided with an elastic component corresponding to the electrical connection component. The elastic component includes an elastic element arranged vertically and a positioning block. The second metal sheet is installed at the bottom of the positioning block. The other end of the conductive rod passes through the explosion-proof block, the elastic element and the positioning block in sequence and is welded to the second metal sheet to form the explosion-proof weld point. The positioning block compresses the elastic element to store elastic potential energy.
[0014] Furthermore, a welding hole is provided in the middle of the second metal sheet for welding and fixing to the conductive rod, and the two ends of the second metal sheet are limited and fixed to the bottom of the positioning block.
[0015] Furthermore, the second metal sheet has limit holes at both ends, and the bottom of the positioning block has a limit post that engages with the limit hole. The second metal sheet engages with the limit post through the limit hole to achieve positioning and fixation.
[0016] Furthermore, the explosion-proof block has a groove with a bottom opening, and the elastic component is disposed within the groove, wherein:
[0017] The elastic element is an elastic ring, the upper end of which abuts against the top wall of the groove, and the lower end of which abuts against the top of the positioning block.
[0018] The positioning block is limited by the grooves on all four sides, and the positioning block can move up and down under the guidance of the grooves.
[0019] Furthermore, the bottom of the explosion-proof block is provided with two first side plates spaced apart along the front-to-back direction, and the bottom of the explosion-proof block is provided with two second side plates spaced apart along the left-to-right direction, and the groove is formed by the two first side plates and the two second side plates.
[0020] The front and rear outer side walls of the positioning block are respectively attached to the inner side walls of the two first side plates to achieve limiting, and the left and right outer side walls of the positioning block are respectively attached to the inner side walls of the two second side plates to achieve limiting.
[0021] Furthermore, a mounting base is provided on the side of the cover plate facing away from the explosion-proof block. The mounting base includes a mounting body and a top cover covering the mounting body. The top of the mounting body has a mounting groove for mounting the first metal sheet.
[0022] Furthermore, a base is provided on the side of the cover plate facing the explosion-proof block, and the first metal sheet, the mounting base, the cover plate, and the base are connected as a whole by fasteners.
[0023] Furthermore, the fastener is a hollow rivet, which passes through the first metal sheet, the mounting base, the cover plate, and the base from top to bottom, with its upper end riveted and fixed to the first metal sheet and its lower end riveted and fixed to the base; the conductive rod passes through the hollow rivet.
[0024] In summary, the explosion-proof capacitor provided by this utility model provides insulation protection by setting an insulating block at the bottom of the explosion-proof block. This insulating block can separate the explosion-proof solder joints from the capacitor core, thereby achieving electrical isolation between the two and thus playing the role of insulation protection. In addition, the insulating block can also block the transmission of high temperature from the explosion-proof solder joints to the core and prevent the physical impact of the second metal sheet from affecting the core, thereby playing the role of thermal isolation and mechanical isolation. Attached Figure Description
[0025] Figure 1 This is an explosion diagram of the explosion-proof capacitor of this utility model;
[0026] Figure 2 for Figure 1 An illustration of the explosion from another perspective;
[0027] Figure 3 This is a schematic diagram of the structure of the explosion-proof capacitor of this utility model;
[0028] Figure 4 for Figure 3 A structural diagram from another perspective;
[0029] Figure 5 for Figure 4 A schematic diagram of the structure after the insulating block is hidden;
[0030] Figure 6 This is a cross-sectional schematic diagram of the explosion-proof capacitor of this utility model.
[0031] The meanings of the reference numerals in the attached figures are as follows:
[0032] 1. Explosion-proof block; 101. First side plate; 102. Second side plate; 2. Cover plate; 3. First metal sheet; 4. Second metal sheet; 401. Welding hole; 402. Limiting hole; 5. Conductive rod; 6. Insulating block; 7. Rivet; 8. Elastic element; 9. Positioning block; 901. Limiting post; 10. Mounting base; 11. Top cover; 12. Fastener; 13. Base. Detailed Implementation
[0033] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.
[0034] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the module or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
[0036] See Figure 1-6 This utility model provides an explosion-proof capacitor for insulation protection, including a housing (not shown in the figure), a capacitor core disposed inside the housing, an explosion-proof block 1 disposed inside the housing and above the capacitor core, and a cover plate 2 sealingly covering the opening at the top of the housing and above the explosion-proof block 1. Additionally, it includes an electrical connection assembly, which includes a first metal plate 3 disposed on the cover plate 2, a second metal plate 4 disposed on the explosion-proof block 1, and a conductive rod 5 passing through the cover plate 2 and the explosion-proof block 1, with one end welded to the first metal plate 3 and the other end welded to the second metal plate 4 to form an explosion-proof solder joint.
[0037] This also includes an insulating block 6 located at the bottom of the explosion-proof block 1 and below the second metal sheet 4. The insulating block 6 separates the explosion-proof solder joints from the capacitor core. In this way, the insulating block 6 separates the explosion-proof solder joints from the capacitor core, thereby achieving electrical isolation between the two and providing insulation protection. In addition, the insulating block 6 can also block the transmission of high temperature from the explosion-proof solder joints to the core and prevent physical impact from affecting the core, thus providing both thermal and mechanical isolation.
[0038] In this embodiment, the insulating block 6 has a rectangular structure, and its four corners are riveted and fixed to the explosion-proof block 1 by rivets 7. Of course, in other embodiments, the insulating block 6 and the explosion-proof block 1 can also be fixed by a screw structure or by heat fusion (welding, etc.), and there are no restrictions here.
[0039] See Figure 1-2 as well as Figure 6 The explosion-proof block 1 is also provided with an elastic component corresponding to the electrical connection component. The elastic component includes an elastic element 8 arranged vertically and a positioning block 9. The second metal sheet 4 is installed at the bottom of the positioning block 9. The other end of the conductive rod 5 passes through the elastic element 8 and the positioning block 9 in sequence and is welded to the second metal sheet 4 to form an explosion-proof weld point. At this time, the positioning block 9 compresses the elastic element 8 to store elastic potential energy.
[0040] Specifically, the second metal sheet 4 has a welding hole 401 in the middle for welding and fixing to the conductive rod 5, and limit holes 402 are opened at both ends of the second metal sheet 4. The bottom of the positioning block 9 has a limit post 901 that engages with the limit hole 402. The second metal sheet 4 achieves limit fixing by engaging the limit hole 402 with the limit post 901.
[0041] Therefore, when the second metal piece 4 engages with the limiting post 901 on the positioning block 9 through the limiting hole 402 to achieve limiting and fixing, compared with the method of fixing with rivets, it not only reduces the use of rivet materials and lowers costs, but also makes assembly simpler and more convenient, and greatly improves assembly efficiency.
[0042] See Figure 2 as well as Figure 5-6 The explosion-proof block 1 has a groove with a bottom opening, and the elastic component is disposed in the groove; preferably, the elastic component 8 is an elastic ring, the upper end of the elastic ring abuts against the top wall of the groove, and the lower end of the elastic ring abuts against the top of the positioning block 9; the positioning block 9 is limited by the groove on all sides, and the positioning block 9 can move up and down under the guidance of the groove.
[0043] Specifically, the bottom of the explosion-proof block 1 has two first side plates 101 spaced apart along the front-to-back direction, and the bottom of the explosion-proof block 1 has two second side plates 102 spaced apart along the left-to-right direction. The two first side plates 101 and the two second side plates 102 form the aforementioned groove. The front and rear outer walls of the positioning block 9 are respectively attached to the inner walls of the two first side plates 101 to achieve limiting, and the left and right outer walls of the positioning block 9 are respectively attached to the inner walls of the two second side plates 102 to achieve limiting, so that the positioning block 9 can only move in the up-down direction under the limiting and guiding action of the groove.
[0044] In this embodiment, the electrical connection assembly is provided in three sets and arranged at intervals along the circumference. The number of the elastic components is consistent with the number of the electrical connection assemblies, and the number of the grooves is consistent with the number of the elastic components.
[0045] Therefore, based on the above structure, by placing the elastic element 8 and the positioning block 9 into the groove, and then passing the other end of the conductive rod 5 through the elastic element 8 and the positioning block 9 in sequence, the second metal plate 4 is then installed at the bottom of the positioning block 9, causing the positioning block 9 to compress the elastic element 8 to store elastic potential energy. Finally, the second metal plate 4 is welded and fixed to the conductive rod 5 to form an explosion-proof weld point. Thus, when the product is operating normally, i.e. in the non-explosion-proof state, if the explosion-proof weld point malfunctions and is in a state of near breakage, the elastic element 8 will release its elastic force, and through the positioning block 9, it will cause the second metal plate 4 to quickly separate from the conductive rod 5, thereby preventing discharge, arcing, and other phenomena from occurring at the weld point between the conductive rod 5 and the second metal plate 4. This provides multiple protective functions and effectively protects the product.
[0046] Therefore, when the positioning block 9 causes the second metal sheet 4 to separate quickly from the conductive rod 5, the insulating block 6 is provided below the second metal sheet 4. The insulating block 6 can block the second metal sheet 4 to prevent the physical impact it generates from affecting the internal core of the capacitor, thus playing a role in mechanical isolation.
[0047] During normal explosion-proof operation, when the capacitor cell undergoes permanent breakdown, the resulting gas and temperature will cause the internal pressure of the capacitor to rise. This pressure will act on the easily deformable cover plate 2, causing the cover plate 2 to bulge upwards. This will break the explosion-proof solder joint between the conductive rod 5 and the second metal sheet 4, resulting in an open circuit inside the capacitor, thus achieving the explosion-proof effect.
[0048] See also Figure 1-2 The cover plate 2, on the side facing away from the explosion-proof block 1, is also provided with a mounting base. The mounting base includes a mounting body 10 and a top cover 11 covering the mounting body 10. The top of the mounting body 10 has a mounting groove for mounting the first metal piece 3. In addition, the cover plate 2, on the side facing the explosion-proof block 1, is also provided with a base 13. The first metal piece 3, the mounting body 10, the cover plate 2, and the base 13 are connected as a whole by fasteners 12.
[0049] Specifically, the fastener 12 is a hollow rivet, which passes through the first metal plate 3, the mounting base 10, the cover plate 2, and the base 13 from top to bottom, with its upper end riveted and fixed to the first metal plate 3 and its lower end riveted and fixed to the base 13; the conductive rod 5 passes through the hollow rivet. Preferably, the conductive rod 5 is a copper rod.
[0050] In summary, the explosion-proof capacitor provided by this utility model provides insulation protection by setting an insulating block 6 at the bottom of the explosion-proof block 1. The insulating block 6 can separate the explosion-proof solder joint from the capacitor core, thereby achieving electrical isolation between the two and thus playing the role of insulation protection. In addition, the insulating block 6 can also block the transmission of high temperature from the explosion-proof solder joint to the core and prevent the second metal sheet 4 from affecting the core due to physical impact, thereby playing the role of thermal isolation and mechanical isolation.
[0051] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.
[0052] It should be understood that the terms "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the module or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0053] Furthermore, in the description of this utility model, "multiple" and "several" mean two or more, unless otherwise explicitly specified.
[0054] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.
Claims
1. An explosion-proof capacitor providing insulation protection, characterized in that, include: Explosion-proof blocks are used to install inside the casing of capacitors; A cover plate, used to seal the opening in the capacitor's casing; The cover plate is located above the explosion-proof block; An electrical connection assembly includes a first metal sheet disposed on the cover plate, a second metal sheet disposed on the explosion-proof block, and a conductive rod passing through the cover plate and the explosion-proof block respectively. One end of the conductive rod is welded and fixed to the first metal sheet, and the other end is welded and fixed to the second metal sheet to form an explosion-proof solder joint. It also includes an insulating block disposed at the bottom of the explosion-proof block and located below the second metal sheet, the insulating block being used to separate the explosion-proof solder joint from the capacitor core.
2. The explosion-proof capacitor providing insulation protection according to claim 1, characterized in that, The insulating block and the explosion-proof block are fixed together by riveting, screwing or hot-melting.
3. The explosion-proof capacitor providing insulation protection according to claim 1 or 2, characterized in that, The explosion-proof block is also provided with an elastic component corresponding to the electrical connection component. The elastic component includes an elastic element arranged vertically and a positioning block. The second metal sheet is installed at the bottom of the positioning block. The other end of the conductive rod passes through the explosion-proof block, the elastic element and the positioning block in sequence and is welded to the second metal sheet to form the explosion-proof weld point. The positioning block compresses the elastic element to store elastic potential energy.
4. The explosion-proof capacitor providing insulation protection according to claim 3, characterized in that, The second metal sheet has a welding hole in the middle for welding and fixing to the conductive rod, and the two ends of the second metal sheet are limited and fixed to the bottom of the positioning block.
5. The explosion-proof capacitor providing insulation protection according to claim 4, characterized in that, The second metal sheet has limit holes at both ends, and the bottom of the positioning block has a limit post that engages with the limit holes. The second metal sheet engages with the limit post through the limit holes to achieve positioning and fixation.
6. The explosion-proof capacitor providing insulation protection according to claim 3, characterized in that, The explosion-proof block has a groove with a bottom opening, and the elastic component is disposed within the groove, wherein: The elastic element is an elastic ring, the upper end of which abuts against the top wall of the groove, and the lower end of which abuts against the top of the positioning block. The positioning block is limited by the grooves on all four sides, and the positioning block can move up and down under the guidance of the grooves.
7. The explosion-proof capacitor providing insulation protection according to claim 6, characterized in that, The bottom of the explosion-proof block is provided with two first side plates spaced apart in the front-to-back direction, and the bottom of the explosion-proof block is provided with two second side plates spaced apart in the left-to-right direction. The groove is formed by the two first side plates and the two second side plates. The front and rear outer side walls of the positioning block are respectively attached to the inner side walls of the two first side plates to achieve limiting, and the left and right outer side walls of the positioning block are respectively attached to the inner side walls of the two second side plates to achieve limiting.
8. The explosion-proof capacitor providing insulation protection according to claim 1 or 2, characterized in that, The cover plate is also provided with a mounting base on the side facing away from the explosion-proof block. The mounting base includes a mounting body and a top cover covering the mounting body. The top of the mounting body is provided with a mounting groove for mounting the first metal sheet.
9. The explosion-proof capacitor providing insulation protection according to claim 8, characterized in that, The cover plate facing the explosion-proof block is also provided with a base, and the first metal sheet, the mounting base, the cover plate and the base are connected as one unit by fasteners.
10. The explosion-proof capacitor providing insulation protection according to claim 9, characterized in that, The fastener is a hollow rivet, which passes through the first metal sheet, the mounting base, the cover plate, and the base from top to bottom, with its upper end riveted and fixed to the first metal sheet and its lower end riveted and fixed to the base; the conductive rod passes through the hollow rivet.