Dry-type explosion-proof capacitor

Abstract

The utility model discloses a dry-type explosion-proof capacitor, comprising a housing which is provided with an accommodation cavity with an opening at one end, and the accommodation cavity is filled with a soft filling material so as to realize fixation and insulation of other components in the accommodation cavity; the explosion-proof cover can cover the opening to seal the containing cavity, the explosion-proof cover can deform when the air pressure in the containing cavity rises, and when the deformation reaches the maximum, the cover face of the explosion-proof cover is separated from the explosion-proof block; the capacitor core group is arranged in the accommodating cavity; and the binding posts are inserted into the explosion-proof cover and are partially positioned in the accommodating cavity, and the end part, positioned in the accommodating cavity, of each binding post is electrically connected with one end surface of the capacitor core group. According to the technical scheme of the embodiment of the utility model, the explosion-proof performance of the capacitor can be ensured while different installation requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a dry-type explosion-proof capacitor. Background Art

[0002] Explosion-proof function is a very important performance of capacitors, especially for capacitors with large volume and large capacity. Once such capacitors explode, the energy generated and the damage caused are extremely great. Therefore, whether the explosion-proof function of the capacitor is reliable is very important. In the current technical scheme, capacitors with explosion-proof function are usually oil-type explosion-proof film capacitors, which achieve explosion-proof function by setting overpressure protection devices. However, the internal filling material of oil-type explosion-proof film capacitors is insulating oil, which has the characteristics of high fluidity. This requires oil-type explosion-proof capacitors to be installed in a fixed manner. Other installation methods will cause the internal insulating oil to fail to completely isolate the internal core from the air, causing the electrical performance at the exposed position to deteriorate and accelerate the failure of the capacitor. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, the purpose of the utility model is to provide a dry explosion-proof capacitor to ensure the explosion-proof performance of the capacitor while meeting different installation requirements.

[0004] To achieve the above object, the embodiment of the utility model provides a dry explosion-proof capacitor, comprising:

[0005] A housing having a receiving cavity with one end open, wherein the receiving cavity is filled with a soft filler to achieve fixation and insulation of other components in the receiving cavity;

[0006] An explosion-proof cover, which can be covered at the opening to close the accommodating cavity, the explosion-proof cover includes a cover surface and an explosion-proof block connected to each other, the explosion-proof block is coaxially arranged with the cover surface and is located on a side of the cover surface close to the accommodating cavity; the explosion-proof cover can be deformed when the air pressure in the accommodating cavity increases, and when the deformation reaches the maximum, the explosion-proof welding point is pulled off to separate the cover surface of the explosion-proof cover from the explosion-proof block;

[0007] A capacitor core group, which is arranged in the accommodating cavity;

[0008] The terminal is inserted on the explosion-proof cover and partially located in the accommodating cavity, and the end of each terminal located in the accommodating cavity is electrically connected to an end surface of the capacitor core group.

[0009] According to the dry-type explosion-proof capacitor of the embodiment of the utility model, the shell has a receiving cavity with an opening at one end, the explosion-proof cover can be covered on the opening to close the receiving cavity, the capacitor core group is arranged in the receiving cavity, the terminal is inserted on the explosion-proof cover and partially located in the receiving cavity, and the ends of the terminal are respectively electrically connected to one end face of the capacitor core group. In addition, the receiving cavity is filled with soft filler to achieve the fixation and insulation of other components in the receiving cavity. Therefore, compared with insulating oil, the setting of soft filler can overcome the limitation that the oil-type explosion-proof film capacitor can only be installed vertically with the lead end facing upward, and can meet various installation requirements. In addition, the explosion-proof cover can be deformed when the air pressure in the receiving cavity increases, and when the deformation reaches the maximum, the explosion-proof welding point is pulled off to separate the cover surface of the explosion-proof cover from the explosion-proof block, so as to avoid the situation that the continuous generation of gas inside the capacitor causes excessive pressure and then explosion, thereby ensuring the explosion-proof performance of the capacitor.

[0010] In addition, the dry-type explosion-proof capacitor proposed in the above embodiment of the utility model may also have the following additional technical features:

[0011] Optionally, the terminal is electrically connected to the end surface of the capacitor core group through a lead wire, and the lead wire includes a conductive wire and an insulating layer wrapped around the conductive wire.

[0012] Optionally, both ends of the capacitor core group are sleeved with an insulating sleeve.

[0013] Optionally, an insulating film is provided on the inner wall of the shell.

[0014] Optionally, a fixing portion is provided on the inner side wall of the shell, and the fixing portion protrudes from the inner side wall of the shell to fix the capacitor core group.

[0015] Optionally, the capacitor core group includes at least one core, the core includes a core rod and a film wound around the outer circumference of the core rod, and end surfaces are provided at both ends of the core for power supply connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a schematic structural diagram of a dry-type explosion-proof capacitor according to an embodiment of the utility model.

[0017] Explanation of reference numerals: housing 100 , soft filling material 110 , fixing portion 120 , explosion-proof cover 200 , cover surface 210 , explosion-proof block 220 , explosion-proof welding point 230 , capacitor core assembly 300 , terminal 400 , lead wire 410 , insulating sleeve 310 , insulating film 320 . DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0020] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] Please refer to Figure 1 An embodiment of the utility model provides a dry-type explosion-proof capacitor, including a housing 100 , an explosion-proof cover 200 , a capacitor core group 300 and a terminal 400 .

[0022] Among them, the shell 100 can be of any shape, such as a cube, a cylinder, an irregular shape, etc. The shell 100 can be made of metal, and it has a receiving cavity with an opening at one end for placing other components. After the other components are placed, the soft filler 110 can be filled into the receiving cavity to achieve the fixation and insulation of other components. In one example, the soft filler 110 can be mixed and cured by different proportions. The material categories are polyurethane and silicone. The utility model does not specifically limit its type, and the Shore hardness of the soft filler 110 is ≤30A. It should be understood that by filling the soft filler 110, the electrical performance failure and leakage risk of the non-vertical installation of the oil-type explosion-proof capacitor can be avoided, the flexibility of its installation method can be ensured, and the explosion-proof effect of the dry capacitor can be ensured. At the same time, the soft filler 110 will not have the swelling effect of the insulating oil of the oil-type explosion-proof film capacitor on the internal core, and has good flame retardancy and insulation.

[0023] The explosion-proof cover 200 can be covered at the opening to seal the accommodating chamber. In addition, the explosion-proof cover 200 can be deformed when the air pressure in the accommodating chamber increases, and when the deformation reaches the maximum, the explosion-proof welding point 230 between the terminal 400 and the explosion-proof block 220 is pulled off, so that the terminal 400 is separated from the explosion-proof block 220, thereby preventing the explosion caused by excessive air pressure in the accommodating chamber.

[0024] The capacitor core group 300 is disposed in the accommodating cavity. In one example, the capacitor core group 300 includes at least one core, each core includes a core rod and a film wound around the outer periphery of the core rod, and gold-sprayed end surfaces are disposed at both ends of the core for power supply connection.

[0025] The terminal 400 can be of any shape or quantity, such as bolt type, welding piece type, irregular shape, etc. The terminal 400 is inserted on the explosion-proof cover 200 and is partially located in the accommodating cavity, and the end of each terminal 400 located in the accommodating cavity is electrically connected to an end face of the capacitor core group 300, and the end of the terminal 400 located outside the housing 100 is used for wiring. In one example, the part of the terminal 400 located outside the housing 100 is sleeved with an insulating seat, and the insulating seat is arranged close to the explosion-proof cover 200, thereby increasing the creepage distance between the terminals 400 to ensure the safety of the capacitor when in use.

[0026] In one embodiment of the present invention, the explosion-proof cover 200 includes a cover surface 210 and an explosion-proof block 220 connected to each other, and the terminal 400 sequentially passes through the cover surface 210 and the explosion-proof block 220 to extend into the accommodating cavity. The explosion-proof block 220 is coaxially arranged with the cover surface 210, and the explosion-proof block 220 is located on the side of the cover surface 210 close to the accommodating cavity, thereby ensuring that the cover surface 210 can accurately follow the change of air pressure in the accommodating cavity and produce corresponding deformation, and when the deformation reaches the maximum, the explosion-proof welding point 230 is pulled off, so that the cover surface 210 is separated from the explosion-proof block 220, ensuring that its explosion-proof function is normally realized.

[0027] In one embodiment of the utility model, the terminal 400 is electrically connected to the end surface of the capacitor core group 300 through the lead 410. At this time, the connection between the terminal 400 and the lead 410 is the explosion-proof welding point 230. Through the setting of the lead 410, while ensuring the stability of the electrical connection between the terminal 400 and the capacitor core group 300, a certain relative displacement space can be provided between the terminal 400 and the capacitor core group 300, thereby avoiding the rigid connection between the terminal 400 and the capacitor core group 300, thereby affecting the separation between the terminal 400 and the explosion-proof block 220. In one example, the lead 410 includes a conductive wire and an insulating layer wrapped around the outside of the conductive wire to prevent leakage.

[0028] In one embodiment of the utility model, both ends of the capacitor core group 300 are provided with an insulating sleeve 310, which can prevent the voltage resistance performance of the capacitor from being affected due to the close distance between the end face of the capacitor core group 300 and the shell 100, and ensure the voltage resistance of the capacitor without increasing the volume and mass of the capacitor.

[0029] In one embodiment of the utility model, an insulating film 320 is provided on the inner wall of the shell 100. Through the setting of the insulating film 320, the pressure resistance performance between the shell 100 and the capacitor core group 300 can be guaranteed, and the gap between the inner wall of the shell 100 and the insulating film 320 can be used as an air guide channel.

[0030] In one embodiment of the present invention, the inner wall of the housing 100 is provided with a fixing portion 120, and the fixing portion 120 protrudes from the inner wall of the housing 100 to fix the capacitor core group 300, thereby preventing the capacitor core group 300 from axially moving in the housing 100, thereby affecting the safety and pressure resistance of the capacitor. In one example, the fixing portion 120 can be formed by pressing inward from the outside of the housing 100 so that the inner wall at the corresponding position protrudes from the accommodating cavity.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0034] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A dry explosion-proof capacitor, characterized in that: include: A housing having a receiving cavity with one end open, wherein the receiving cavity is filled with a soft filler to achieve fixation and insulation of the components in the receiving cavity; An explosion-proof cover, which can be covered at the opening to close the accommodating cavity, the explosion-proof cover includes a cover surface and an explosion-proof block connected to each other, the explosion-proof block is coaxially arranged with the cover surface and is located on a side of the cover surface close to the accommodating cavity; the explosion-proof cover can be deformed when the air pressure in the accommodating cavity increases, and when the deformation reaches the maximum, the explosion-proof welding point is pulled off to separate the cover surface of the explosion-proof cover from the explosion-proof block; A capacitor core group, which is arranged in the accommodating cavity; The terminal is inserted on the explosion-proof cover and partially located in the accommodating cavity, and the end of each terminal located in the accommodating cavity is electrically connected to an end surface of the capacitor core group.

2. The capacitor according to claim 1, characterized in that The terminal is electrically connected to the end surface of the capacitor core group through a lead wire, and the lead wire includes a conductive wire and an insulating layer wrapped around the conductive wire.

3. The capacitor according to claim 1, characterized in that Both ends of the capacitor core group are sleeved with an insulating sleeve.

4. The capacitor according to claim 1, characterized in that The inner wall of the shell is sleeved with an insulating film.

5. The capacitor according to claim 1, characterized in that The inner side wall of the shell is provided with a fixing portion, and the fixing portion protrudes from the inner side wall of the shell to fix the capacitor core group.

6. The capacitor according to any one of claims 1 to 5, characterized in that: The capacitor core group includes at least one core, and the core includes a core rod and a film wound around the outer circumference of the core rod. End surfaces are arranged at both ends of the core for power supply connection.

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