Explosion-proof dry capacitor

Abstract

This invention discloses an explosion-proof dry-type capacitor, comprising a shell with a core cavity and an opening; the opening extends through the core cavity; a cell assembly including a cell element and a positioning sleeve, the cell element being installed within the positioning sleeve so that the positioning sleeve covers the outer periphery of the cell element; a filling gap exists between the outer peripheral wall of the cell element and the inner peripheral wall of the positioning sleeve; the filling gap is filled with a potting material layer; the positioning sleeve passes through the opening into the core cavity and is connected to the shell; a cover plate assembly sealingly covers the opening; and a wiring assembly including terminals and leads; the terminals are disposed on the cover plate assembly; one end of the lead is electrically connected to the cell element, and the other end of the lead is electrically connected to the terminal. In this invention, after the cell element is assembled into the positioning sleeve, it is fixed to the positioning sleeve with a potting material layer, and then the positioning sleeve is assembled into the shell. This forms a multi-layered protection on the outside of the cell element, reducing the possibility of shell cracking.

Description

Technical Field

[0001] This invention relates to the field of capacitor technology, and more particularly to an explosion-proof dry capacitor. Background Technology

[0002] Dry-type capacitors are a type of capacitor without liquid electrolyte or oil, unlike oil-immersed or wet-type electrolytic capacitors. They are widely used in the power and electronics fields due to their safety, maintenance-free operation, and long lifespan. They typically include power dry-type film capacitors and electronic dry-type capacitors. Taking power dry-type film capacitors as an example, they use metallized polypropylene film as the core dielectric, often filled with epoxy resin or inert gas; the casing is mostly aluminum, housing the core components.

[0003] In dry-type capacitors, during assembly, the cell components are usually assembled into the capacitor casing. Positioning sleeves are set at the top and bottom of the cell assembly and positioned with the capacitor casing. Then, sealing gas or potting compound is filled into the capacitor casing to seal the cell components.

[0004] In related technologies, if sealing is achieved by filling with sealing gas, there will be assembly gaps between the upper and lower positioning sleeves and the battery cell, casing, and leads. External moisture can be drawn into the interior through these gaps, leading to a decrease in the insulation performance of the capacitor and its failure due to moisture.

[0005] If potting compound is used for encapsulation, after assembly into the housing, the part of the battery cell between the upper and lower positioning sleeves is a layer of potting compound. After use, the battery cell expands due to overheating and applies pressure to the layer of potting compound, which in turn squeezes the housing structure, causing the housing to crack and potentially leading to a fire or explosion. Summary of the Invention

[0006] In order to overcome at least one of the defects of the prior art, the present invention provides an explosion-proof dry capacitor in which the battery cell is assembled into the positioning sleeve and fixed with a layer of potting material. The positioning sleeve is then assembled into the outer shell, thus forming a multi-layer protection on the outside of the battery cell to reduce the possibility of the outer shell cracking.

[0007] The technical solution adopted by this invention to solve its problem is: An explosion-proof dry capacitor includes, The outer casing has a core cavity and an opening; the opening extends through the core cavity. A battery cell assembly includes a battery cell element and a positioning sleeve. The battery cell element is installed inside the positioning sleeve so that the positioning sleeve covers the outer periphery of the battery cell element. There is a filling gap between the outer peripheral wall of the battery cell element and the inner peripheral wall of the positioning sleeve. The filling gap is filled with a potting material layer. The positioning sleeve passes through the opening into the core cavity and is connected to the outer shell. A cover assembly that seals over the opening; A wiring assembly includes a terminal block and a lead wire; the terminal block is disposed on the cover plate assembly; one end of the lead wire is electrically connected to the battery cell element, and the other end of the lead wire is electrically connected to the terminal block.

[0008] As an optional implementation, the outer peripheral wall of the positioning sleeve is provided with a protruding structure, which is used to abut against the inner peripheral wall of the core cavity after the positioning sleeve passes through the core cavity, so that the positioning sleeve and the inner peripheral wall of the core cavity form an exhaust gap.

[0009] As an optional implementation, the protruding structure includes a plurality of protruding ribs, which are spaced apart in the circumferential direction of the positioning sleeve; the plurality of protruding ribs abut against the inner peripheral wall of the core cavity so that the exhaust gap is formed between two adjacent protruding ribs.

[0010] As an optional implementation, the outer wall of the protruding rib is provided with a first guide slope and a second guide slope; the first guide slope and the second guide slope are connected at an angle in the circumferential direction of the positioning sleeve.

[0011] As an optional implementation, the protruding rib extends along the axial direction of the positioning sleeve; the top end of the protruding rib extends out of the top end of the positioning sleeve and is formed as a positioning protrusion, which is used to bend toward the core element to abut against the top surface of the core element.

[0012] As an optional implementation, the bottom end of the protruding rib extends toward the bottom end face of the positioning sleeve and abuts against the bottom wall of the core cavity.

[0013] As an optional implementation, the core element is provided with a through slot; the lead wire passes through the through slot and extends out from the bottom end of the core element to be electrically connected to the core element.

[0014] As an optional implementation, the bottom wall of the positioning sleeve is provided with a positioning ring, the positioning ring is provided with an outlet notch, the positioning ring corresponds to the wire through groove, so as to guide the lead wire out through the outlet notch.

[0015] As an optional implementation, the outer shell includes a main shell segment and an open shell segment, wherein the core cavity is disposed within the main shell segment; the open shell segment is connected to the top end of the main shell segment and surrounds it to form the opening; the open shell segment and the main shell segment are connected by a bent segment.

[0016] As an optional implementation, the cover plate assembly includes a cover plate and a terminal support for the wiring sleeve. The cover plate covers the opening and is sealed with an insulating sealant. The terminal support for the wiring sleeve is connected to the cover plate, and the wiring terminal is disposed inside the terminal support for the wiring sleeve. The end of the lead wire connected to the wiring end is provided with an explosion-proof structure.

[0017] In summary, the present invention has the following technical effects: 1. A potting material layer is provided between the positioning sleeve and the core component. That is, the potting material layer covers the outer periphery of the core component, and the positioning sleeve covers the outside of the potting material layer. During use, if the core component expands due to overheating or other reasons, it will directly squeeze the potting material layer. The potting material layer can absorb the pressure itself, or it will squeeze the positioning sleeve, rather than directly squeezing the outer shell structure. Therefore, the core component has a potting material layer, a positioning sleeve, and an outer shell, forming a three-layer protection, which improves the service life of the capacitor.

[0018] 2. Even if the potting material layer expands due to the core component, the expansion force will only cause cracking of the positioning sleeve. The gas discharged from the core component inside the positioning sleeve will also be discharged to the outer shell, rather than being discharged directly. Therefore, it can reduce the possibility of fire or explosion caused by overheating of the core component, thus achieving explosion protection. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the explosion-proof dry capacitor of the present invention; Figure 2 This is a cross-sectional view of the explosion-proof dry capacitor of the present invention; Figure 3 This is a schematic diagram of the internal structure of the explosion-proof dry capacitor of the present invention; Figure 4 This is a schematic diagram of the structure of the casing of the explosion-proof dry capacitor of the present invention; Figure 5This is a schematic diagram of the positioning sleeve of the explosion-proof dry capacitor of the present invention; Figure 6 This is a schematic diagram of the positioning sleeve of the explosion-proof dry capacitor of the present invention from another perspective.

[0021] The meanings of the reference numerals in the attached drawings are as follows: 10, outer shell; 101, main shell segment; 102, open shell segment; 103, bent segment; 11, core cavity; 12, opening; 20, cover plate assembly; 21, cover plate; 22, terminal support; 31, lead wire; 32, terminal block; 40, core element; 41, through-hole; 50, positioning sleeve; 51, positioning protrusion; 52, protruding rib; 521, first guide slope; 522, second guide slope; 53, positioning ring; 531, lead-out notch. Detailed Implementation

[0022] 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.

[0023] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0024] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0025] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0026] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0027] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0028] See Figures 1-6 This invention discloses an explosion-proof dry capacitor, including a housing 10, a cell assembly, a cover plate assembly 20, and a wiring assembly. The housing 10 is provided with a core cavity 11 and an opening 12, with the opening 12 extending into the core cavity 11. The cell assembly is assembled into the core cavity 11 through the opening 12. The wiring assembly can be electrically connected to the cell assembly, and the cover plate assembly 20 can cover the opening 12 to seal the cell assembly inside the core cavity 11.

[0029] Specifically, the battery cell assembly includes a battery cell element and a positioning sleeve 50. The battery cell element is installed inside the positioning sleeve 50. After the battery cell element is assembled into the positioning sleeve 50, the positioning sleeve 50 covers the outer periphery of the battery cell element, and there is a filling gap between the outer peripheral wall of the battery cell element and the inner peripheral wall of the positioning sleeve 50. The filling gap is filled with a potting material layer. After the battery cell assembly is assembled, the positioning sleeve 50 can be inserted into the core cavity 11 through the opening 12 and connected to the outer shell 10.

[0030] In addition, the wiring assembly includes a terminal block 32 and a lead wire 31. The terminal block 32 is disposed on the cover plate assembly 20, and one end of the lead wire 31 is electrically connected to the battery cell element, while the other end of the lead wire 31 is electrically connected to the terminal block 32.

[0031] Based on the above structure, when using the explosion-proof dry capacitor of the present invention, the core element and the lead wire 31 can be assembled. The core element 40 has a wiring end that leads out from the lead wire 31. The core element 40 is assembled to the positioning sleeve 50, so that the positioning sleeve 50 can cover the outer periphery of the core element 40. Then, potting is performed. By filling the filling gap between the outer peripheral wall of the core element 40 and the inner peripheral wall of the positioning sleeve 50 with potting material, a potting material layer is formed that can connect the core element 40 and the positioning sleeve 50. At the same time, it can also achieve electrical insulation, waterproofing and moisture-proofing, and shock and impact resistance on the outside of the core element 40.

[0032] Then, the positioning sleeve 50 and the core element 40 are assembled together to fit the opening 12 into the core cavity 11 of the housing 10, and the positioning sleeve 50 is connected and fixed to the housing 10. Then, the cover plate assembly 20 is sealed to the opening 12, so that the wiring end of the core element 40 is electrically connected to the wiring terminal 32 on the cover plate 21, thus completing the assembly of the capacitor.

[0033] In this embodiment, a potting material layer is provided between the positioning sleeve 50 and the core element 40. That is, the potting material layer covers the outer periphery of the core element 40, and the positioning sleeve 50 covers the outside of the potting material layer. During use, if the core element 40 expands due to overheating or other reasons, it will directly squeeze the potting material layer. The potting material layer can absorb the pressure itself, or it will squeeze the positioning sleeve 50, rather than directly squeezing the outer shell 10 structure. Therefore, the core element 40 has a potting material layer, a positioning sleeve 50, and an outer shell 10, forming a three-layer protection, which improves the service life of the capacitor.

[0034] Even if the potting material layer expands due to the core element 40, the expansion force will cause the positioning sleeve 50 to crack. The gas discharged from the positioning sleeve 50 by the core element 40 will be discharged to the outer shell 10 instead of being discharged directly. Therefore, the risk of fire or explosion of the core element 40 due to overheating can be reduced, thereby achieving explosion protection.

[0035] It should be noted that the potting material layer used to fill the gap between the core element 40 and the positioning sleeve 50 in this embodiment can be formed by epoxy resin potting compound, polyurethane potting compound, silicone potting compound, etc.

[0036] As an optional implementation, a protruding structure is provided on the outer peripheral wall of the positioning sleeve 50. After the positioning sleeve 50 passes through the core cavity 11, the outer peripheral wall of the positioning sleeve 50 abuts against the inner peripheral wall of the core cavity 11 with the protruding structure, so that the positioning sleeve 50 and the inner peripheral wall of the core cavity 11 form an exhaust gap.

[0037] During use, the core element 40 will release combustible gas due to electrolysis, which may cause bulging of the core element 40. The potting material layer is easily cracked. Under high internal pressure, the positioning sleeve 50 may crack. The released combustible gas will enter the exhaust gap reserved between the positioning sleeve 50 and the core cavity 11 of the outer shell 10. This can effectively reduce the situation where the released gas causes the internal pressure to be too high and the outer shell 10 to crack.

[0038] As an optional implementation, the protruding structure includes a plurality of protruding ribs 52, and the plurality of protruding ribs 52 are spaced apart in the circumferential direction of the positioning sleeve 50. The plurality of protruding ribs 52 abut against the inner peripheral wall of the core cavity 11 so that an exhaust gap is formed between two adjacent protruding ribs 52.

[0039] After the positioning sleeve 50 is assembled into the core cavity 11, multiple protruding ribs 52 can form multiple venting gaps in the circumferential direction of the positioning sleeve 50. Since the location of the crack in the positioning sleeve 50 due to overheating inside the core element 40 is uncertain, if multiple venting gaps are not set in the circumferential direction, the gas will not be able to be discharged in time, resulting in local high pressure inside the outer shell 10 and cracking of the outer shell 10.

[0040] In addition, multiple exhaust gaps are reserved between the positioning sleeve 50 and the outer shell 10. These multiple exhaust gaps are distributed in the circumferential direction, so the gas discharged due to the cracking of the positioning sleeve 50 can be evenly distributed, thus making the harmful gas inside the outer shell 10 evenly distributed and preventing the occurrence of local high pressure inside.

[0041] It should also be noted that the above-mentioned protruding structure can also be a protruding point or a protruding block, so that an exhaust gap can be formed after the positioning sleeve 50 and the outer shell 10 are assembled.

[0042] Alternatively, a groove structure could be provided on the outer peripheral wall of the positioning sleeve 50 to form an exhaust gap after the positioning sleeve 50 is assembled into the core cavity 11. However, this would result in the positioning sleeve 50 being thinner at the corresponding location of the groove structure, making it prone to cracking. Therefore, in this embodiment, a protruding structure is provided on the outer peripheral wall of the positioning sleeve 50, which, after abutting against the inner wall of the core cavity 11, not only forms an exhaust gap but also strengthens the thickness of the positioning sleeve 50, reducing the likelihood of cracking.

[0043] As an optional implementation, the outer wall of the protruding rib 52 is provided with a first guide slope 521 and a second guide slope 522. The first guide slope 521 and the second guide slope 522 are connected at an angle in the circumferential direction of the positioning sleeve 50. The first guide slope 521 and the second guide slope 522 are respectively provided on both sides of the protruding rib 52. The first guide slope 521 and the second guide slope 522 connect the protruding rib 52 and the outer peripheral wall of the positioning sleeve 50 with slopes. After the protruding rib 52 abuts against the inner wall of the core cavity 11, the exhaust gap formed is located on both sides of the protruding rib 52. Then the gas pressure generated by the gas entering the exhaust gap can be applied to the corresponding first guide slope 521 or second guide slope 522. The slope can decompose the force and reduce the direct application of the gas pressure of the exhaust gap to the positioning sleeve 50 or the outer shell 10, thereby effectively reducing the cracking of the positioning sleeve 50 or the outer shell 10.

[0044] As an optional implementation, the protruding rib 52 extends along the axial direction of the positioning sleeve 50, and the top end of the protruding rib 52 extends beyond the top end of the positioning sleeve 50. The portion of the protruding rib 52 extending beyond the top end of the positioning sleeve 50 can be formed as a positioning protrusion 51. After the core element 40 is assembled into the positioning sleeve 50, the positioning protrusion 51 can be bent toward the core element 40 to abut against the top surface of the core element 40. In this way, the positioning protrusion 51 can form a limit on the top surface of the core element 40, so the core element 40 can be encapsulated in the positioning sleeve 50, making the assembly structure of the core element 40 more stable.

[0045] As an optional implementation, the bottom end of the protruding rib 52 extends toward the bottom end face of the positioning sleeve 50 and abuts against the bottom wall of the core cavity 11. With this structure, after the positioning sleeve 50 is assembled into the core cavity 11, the bottom wall of the positioning sleeve 50 abuts against the bottom wall of the core cavity 11 with the protruding rib 52. The resulting exhaust gap can extend from the side of the positioning sleeve 50 to the bottom, forming a larger exhaust area. This allows the positioning sleeve 50 to exhaust more evenly when it cracks, thereby reducing local high pressure inside the outer shell 10.

[0046] As an optional implementation, for the connection between the lead wire 31 and the core element 40, a through groove 41 can be provided in the core element 40, and the through groove 41 can extend from the top end of the core element 40 to the bottom end of the core element 40. The lead wire 31 is passed through the through groove 41 and extends out from the bottom end of the core element 40 to be electrically connected to the core element 40. In this way, when the lead wire 31 is assembled with the core element 40, the lead wire 31 can be passed through the through groove 41, avoiding the potting material layer between the core element 40 and the positioning sleeve 50. One end of the lead wire 31 extends out from the top end of the through groove 41 and is used to make an electrical connection with the terminal 32 on the cover plate 21, while the other end of the lead wire 31 can extend out from the bottom end of the through groove 41 and make an electrical connection with the electrode segment of the battery cell element.

[0047] Since the outer periphery of the battery cell is covered with a potting material layer, the electrode clearance from the potting material layer can be set at the top or bottom of the battery cell. Two leads 31 are provided, which are used to electrically connect to the two ends of the core element 40 respectively.

[0048] As an optional implementation structure, a positioning ring 53 can also be provided on the bottom wall of the positioning sleeve 50, and the positioning ring 53 is provided with a lead-out notch 531. The positioning ring 53 corresponds to the wire-passing groove 41 to guide the lead wire 31 out through the lead-out notch 531. In this way, the end of the lead wire 31 guided from the wire-passing groove 41 to the bottom can be positioned by the positioning ring 53, and guided by the lead-out notch 531 to be electrically connected to the bottom electrode of the core element 40. In this way, the positioning ring 53 and the lead-out notch 531 can position and guide the lead wire 31, making the wiring of the lead wire 31 more stable.

[0049] As an optional implementation, the outer shell 10 may also include a main shell segment 101 and an open shell segment 102. A core cavity 11 is provided inside the main shell segment 101. The open shell segment 102 is connected to the top of the main shell segment 101 and surrounds it to form an opening 12. The open shell segment 102 and the main shell segment 101 are connected by a bent segment 103.

[0050] It should be noted that the outer shell 10 can be made of aluminum. When the outer shell 10 is formed, since the core cavity 11 is provided in the main body section, the core element 40 is assembled to the main body shell section 101 for positioning and installation. The open shell section 102 can be surrounded at the top of the main body shell section 101 to form a separate opening 12 structure, so that the position of the opening 12 is at a certain distance from the core cavity 11, reducing the interference of the assembly of the cover plate assembly 20 on the core element 40 and the potting material layer in the core cavity 11.

[0051] Specifically, since the positioning sleeve 50 is assembled around the outer periphery of the core component 40 and then inserted into the main body shell section 101 together, after assembly, the bent section 103 between the main body shell section 101 and the open shell section 102 limits the positioning sleeve 40 above, preventing the core component 40 from shaking inside after the positioning sleeve 50 is assembled.

[0052] The open shell section 102 and the main shell section 101 are connected by an arc transition structure or a sloping transition structure of a bending section 103. When gas is discharged from inside the main shell section 101, the bending section effectively disperses the stress at the connection between the main shell section 101 and the open shell section 102. Even if the stress is too great, the bending section can also provide a buffer transition section, avoiding cracking of the outer shell 10 caused by stress concentration, thereby protecting the integrity of the potting material layer and reducing the failure of the potting material layer.

[0053] Furthermore, after the gas is discharged, it enters the space enclosed by the open shell section, providing a buffer space to prevent direct bursting and explosion.

[0054] Of course, the main shell segment 101, the open shell segment 102 and the bending segment 103 mentioned above can be formed by integral molding, so that the shell 10 formed is integral and is not easy to crack.

[0055] As an optional implementation, the cover plate assembly 20 includes a cover plate 21 and a terminal support member 22. The cover plate 21 is used to cover the opening 12. After the cover plate 21 and the opening 12 are covered, they are sealed with an insulating sealant to seal the connection between the capacitor housing and the cover plate, so that the interior remains in an insulating and sealed state.

[0056] The terminal support 22 is connected to the cover plate 21, and the terminal 32 is disposed inside the terminal support 22. In some implementation structures, the terminal support can be a terminal sleeve, terminal post, or terminal block, etc., which can support the terminal after assembly with it.

[0057] Specifically, holes can be provided on the cover plate 21 for the lead wire 31 of the core element 40 to pass through and electrically connect to the terminal 32. The terminal 32 is positioned and assembled by the terminal support 22. Based on the structure of the terminal support 22 as a terminal sleeve, the terminal sleeve can position and assemble the terminal 32, support the terminal and play a protective role, preventing the terminal 32 from being exposed and scratched, so that the wiring position structure is stable and the capacitor wiring is stable in use.

[0058] More specifically, an explosion-proof structure can be provided at the end of the lead 31, and the end of the lead with the explosion-proof structure is electrically connected to the terminal block. The explosion-proof structure can be an explosion-proof notch, a easily broken metal sheet, or a weak solder joint. In this way, when the internal high pressure or temperature is abnormal, the circuit can be quickly cut off by the explosion-proof structure to achieve explosion protection.

[0059] The technical means disclosed in this invention 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 principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. An explosion-proof dry-type capacitor, characterized in that, include, The outer casing has a core cavity and an opening; the opening extends through the core cavity. A battery cell assembly includes a battery cell element and a positioning sleeve. The battery cell element is installed inside the positioning sleeve so that the positioning sleeve covers the outer periphery of the battery cell element. There is a filling gap between the outer peripheral wall of the battery cell element and the inner peripheral wall of the positioning sleeve. The filling gap is filled with a potting material layer. The positioning sleeve passes through the opening into the core cavity and is connected to the outer shell. A cover assembly that seals over the opening; A wiring assembly includes a terminal block and a lead wire; the terminal block is disposed on the cover plate assembly; one end of the lead wire is electrically connected to the battery cell element, and the other end of the lead wire is electrically connected to the terminal block.

2. The explosion-proof dry-type capacitor according to claim 1, characterized in that, The outer peripheral wall of the positioning sleeve is provided with a protruding structure, which is used to abut against the inner peripheral wall of the core cavity after the positioning sleeve passes through the core cavity, so that the positioning sleeve and the inner peripheral wall of the core cavity form an exhaust gap.

3. The explosion-proof dry capacitor according to claim 2, characterized in that, The protruding structure includes multiple protruding ribs, which are spaced apart in the circumferential direction of the positioning sleeve; the multiple protruding ribs abut against the inner peripheral wall of the core cavity so that the exhaust gap is formed between two adjacent protruding ribs.

4. The explosion-proof dry capacitor according to claim 3, characterized in that, The outer wall of the protruding rib is provided with a first guide slope and a second guide slope; the first guide slope and the second guide slope are connected at an angle in the circumferential direction of the positioning sleeve.

5. The explosion-proof dry capacitor according to claim 3, characterized in that, The protruding rib extends along the axial direction of the positioning sleeve; the top end of the protruding rib extends out of the top end of the positioning sleeve and forms a positioning protrusion, which is used to bend toward the core element to abut against the top surface of the core element.

6. The explosion-proof dry capacitor according to claim 3, characterized in that, The bottom end of the protruding rib extends toward the bottom end face of the positioning sleeve and abuts against the bottom wall of the core cavity.

7. The explosion-proof dry-type capacitor according to any one of claims 1-6, characterized in that, The core element has a through slot for threading; the lead wire passes through the through slot and extends out from the bottom of the core element to be electrically connected to the core element.

8. The explosion-proof dry-type capacitor according to claim 7, characterized in that, The bottom wall of the positioning sleeve is provided with a positioning ring, and the positioning ring is provided with an outlet notch. The positioning ring corresponds to the wire through groove to guide the lead wire out through the outlet notch.

9. The explosion-proof dry-type capacitor according to any one of claims 1-6, characterized in that, The outer shell includes a main shell segment and an open shell segment. The core cavity is provided inside the main shell segment. The open shell segment is connected to the top of the main shell segment and surrounds it to form the opening. The open shell segment and the main shell segment are connected by a bent segment.

10. The explosion-proof dry-type capacitor according to any one of claims 1-6, characterized in that, The cover plate assembly includes a cover plate and a terminal support member. The cover plate covers the opening and is sealed with an insulating sealant. The terminal support member is connected to the cover plate, and the wiring terminal is disposed inside the terminal support member. The end of the lead wire connected to the wiring terminal is provided with an explosion-proof structure.

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