A high-insulation solid-state capacitor

Abstract

The utility model relates to solid capacitor technical field, and disclose a kind of high insulation solid-state capacitor, shell is used to place three-phase capacitor core, shell is placed with insulating film and located in insulating film and the resin insulating cover shell wrapped in the outside surface of three-phase capacitor core, the insulation between three-phase capacitor core and shell is realized by insulating film and resin insulating cover shell;Face cover bottom is equipped with the insulating block inserted into the inside of shell top end, and the wiring port of the connecting line of cooperation capacitor core is embedded on insulating block and face cover and connected.The utility model adopts insulating film, resin insulating cover shell, environmental protection resin grouting material multiple insulation and oxygenless sealing design to improve pressure resistance, avoid breakdown and partial discharge, prolong service life.Insulating layer in the inside of shell port and insulating glue form double insulation barrier, insulate the risk of leakage of metal shell and internal element.

Description

Technical Field

[0001] This utility model belongs to the field of solid-state capacitor technology, and specifically relates to a high-insulation solid-state capacitor. Background Technology

[0002] As electronic devices develop towards higher frequencies, higher voltages, and smaller sizes, solid-state capacitors, as key energy storage components, have seen their insulation performance, reliability, and service life become core factors restricting equipment performance. In fields such as power systems, new energy vehicles, and industrial control, capacitors need to operate stably for extended periods under complex conditions such as high voltage, strong vibration, and humidity, thus placing higher demands on insulation structure, protection design, and environmental adaptability.

[0003] Traditional solid-state capacitors often rely on single materials or simple encapsulation structures for insulation design, making it difficult to meet the insulation strength requirements of high-voltage scenarios. For example, relying solely on a shell or a single insulating material (such as ordinary plastic film) to isolate the core from the casing results in insufficient dielectric strength, making them prone to leakage or breakdown under high-voltage conditions. The lack of effective insulation between the terminals and the casing can lead to malfunctions due to poor contact or short circuits. Furthermore, residual air in the internal cavity and insufficient sealing performance can easily cause core oxidation, moisture absorption, or partial discharge, leading to breakdown and shortening service life. In addition, disordered wiring arrangement can easily cause tangling and short circuits, and inaccurate positioning during assembly can result in poor contact. Existing products have complex assembly processes and poor maintainability, failing to meet the demands of mass production and high-reliability applications.

[0004] Therefore, there is an urgent need for a solid-state capacitor structure design that features multiple insulation protections, high sealing performance, and long lifespan. Utility Model Content

[0005] The present invention aims to solve the technical problems of capacitors in the prior art, such as the single insulation system and insufficient sealing performance, which lead to easy leakage and breakdown under high voltage, easy oxidation and moisture absorption of the core, and complex structural assembly.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A high-insulation solid capacitor, comprising:

[0008] The outer casing is used to house the three-phase capacitor core. Inside the outer casing is an insulating film and a resin insulating sleeve located inside the insulating film and wrapped around the outer side of the three-phase capacitor core. The insulating film and the resin insulating sleeve achieve insulation between the three-phase capacitor core and the outer casing.

[0009] The cover has an insulating block at its bottom that inserts into the inside of the top of the outer casing. The insulating block and the cover are embedded with wiring ports that connect to the connecting wires on the capacitor core.

[0010] Preferably, the insulating film is a PT film that is attached to the inner wall surface of the outer casing.

[0011] Preferably, environmentally friendly resin potting material is injected into the gap between the outer shell and the insulating film and resin insulating sleeve to fill the cavity between the outer shell and the insulating film and resin insulating sleeve, so as to completely remove the air in the cavity, protect the capacitor core in an oxygen-free state, avoid oxidation of the capacitor core and contact with moisture, so that the capacitor is less likely to break down or partially discharge during charging, thus improving the service life of the capacitor.

[0012] Preferably, the resin insulating housing includes a plug-in housing with three plug-in holes for positioning and plugging in the three-phase capacitor core, a front cover plate and a rear cover plate for encapsulating the three-phase capacitor core inside the plug-in housing from two sides of the plug-in housing.

[0013] Preferably, the front cover plate and the rear cover plate are respectively provided with staggered placement grooves that are designed to guide the placement of the connecting wires on the three-phase capacitor core.

[0014] Preferably, the plug-in housing is provided with several plug-in slots, and the front cover plate and the rear cover plate are provided with plug-in posts that correspond to the plug-in slots for plug-in insertion.

[0015] Preferably, an insulating layer is formed on the inside of the top port of the housing, located between the housing and the cover.

[0016] Preferably, the front and rear ends of the cover are provided with threaded grooves, and the outer shell is provided with mounting holes that correspond to the threaded grooves. The outer shell and the cover are fixed together by screws that pass through the mounting holes and are screwed into the threaded grooves.

[0017] Preferably, the faceplate and the outer shell are also bonded together with insulating adhesive.

[0018] Compared with the prior art, the technical effects and advantages of this utility model are:

[0019] This high-insulation solid-state capacitor achieves both mechanical fixation and insulation protection through a composite connection between the outer casing and the faceplate: an insulating block at the bottom of the faceplate is inserted into the inner side of the top of the outer casing, which both isolates the wiring ports from the outer casing to prevent short circuits and fixes the faceplate position to prevent vibration displacement; the insulating layer inside the outer casing ports and insulating adhesive form a double insulation barrier, isolating the metal casing from the risk of leakage between the internal components and filling gaps to prevent moisture. The combination of screws and insulating adhesive provides strong mechanical strength while the adhesive buffers vibration and prevents metal-to-metal leakage, ensuring structural stability and insulation reliability, making it suitable for high-voltage applications.

[0020] The capacitor's internal structure employs a triple protection system: an insulating film, a resin insulating shell, and environmentally friendly resin potting compound. The PT film adheres tightly to the inner wall of the outer shell, isolating the shell from the core with high dielectric strength. Its high-temperature resistance and anti-aging properties ensure long-term insulation. The resin shell positions and protects the core through the insertion holes, preventing damage from external forces and breakage from pulling on connecting wires. The cavity between the outer shell, the insulating film, and the shell is filled with environmentally friendly resin potting compound, completely eliminating air and creating an oxygen-free, sealed environment. This prevents core oxidation and moisture intrusion. Simultaneously, the resin material conducts heat, buffers vibration, and eliminates the risk of partial discharge and breakdown caused by air in the cavity, significantly improving the capacitor's withstand voltage and service life.

[0021] The plug-in slots of the housing mate with the plug-in posts of the front and rear covers, allowing for quick and easy positioning and installation without tools, thus improving assembly efficiency. The staggered placement slots on the front and rear covers guide the orderly arrangement of connecting wires, reducing the risk of short circuits and facilitating wire location during maintenance. This structure, combined with the insulating film and potting compound, achieves sealing, dust and moisture protection through filling the plug-in gaps, simplifies the manufacturing process with its modular design, and uses environmentally friendly materials that meet green production requirements. This allows the capacitor to withstand complex operating conditions such as high temperatures and humidity, combining reliability with wide applicability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is an exploded view of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the outer shell of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the faceplate of this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the capacitor core of this utility model;

[0027] Figure 6 This is an exploded view of the resin insulating sleeve of this utility model.

[0028] In the diagram: 1. Outer shell; 2. Capacitor core; 3. Insulating film; 4. Resin insulating sleeve; 41. Plug-in hole; 42. Plug-in shell; 43. Front cover plate; 44. Rear cover plate; 45. Placement slot; 46. Plug-in slot; 47. Plug-in post; 5. Face cover; 6. Insulating block; 7. Connecting wire; 8. Wiring port; 9. Threaded groove; 10. Mounting hole; 11. Screw. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] The following combination Figures 1 to 6 This application will be described in further detail.

[0031] This application discloses a high-insulation solid capacitor, including a housing 1 and a cover 5. The housing 1 is used to house a three-phase capacitor core 2. The bottom of the cover 5 has an insulating block 6 that inserts into the inner side of the top of the housing 1. The insulating block 6 and the cover 5 have a wiring port 8 embedded therein, which is connected to the connecting wire 7 on the capacitor core 2. An insulating layer is formed between the housing 1 and the cover 5 by coating the inner side of the top port of the housing 1. The front and rear ends of the cover 5 are respectively provided with threaded grooves 9. The housing 1 has mounting holes 10 that correspond to the threaded grooves 9. The housing 1 and the cover 5 are fixed together by screws 11 that pass through the mounting holes 10 and are screwed into the threaded grooves 9. The cover 5 and the housing 1 are also bonded together with insulating adhesive.

[0032] The insulating block 6 is embedded in the bottom of the cover 5, and the wiring port 8 is precisely connected to the connecting wire 7 of the capacitor core 2 to avoid poor contact caused by loose wiring. At the same time, the insulating block 6 isolates the wiring port 8 from the outer casing 1 to prevent short circuits. The insulating block 6 is inserted into the inner side of the top of the outer casing 1 to fix the position of the cover 5 and prevent the cover 5 from shifting due to vibration or other factors, which would affect the connection of internal components.

[0033] An insulating layer and insulating adhesive are applied to the inside of the port of the outer casing 1 to form double insulation protection, creating an additional insulating barrier between the outer casing 1 and the cover 5. This prevents leakage between the outer casing 1 (metal material) and the cover 5 or internal components, making it particularly suitable for high-voltage applications and improving insulation performance. The insulating layer can fill the tiny gaps at the connection between the outer casing 1 and the cover 5, reducing moisture intrusion and preventing internal components from being damaged by moisture.

[0034] Screw 11 passes through mounting hole 10 and is screwed into threaded groove 9 of cover 5, providing a secure mechanical fixation and preventing separation of housing 1 from cover 5. Insulating adhesive further enhances the seal while avoiding the risk of leakage caused by direct contact between metal screw 11 and housing 1 and cover 5. After the adhesive cures, it can buffer vibration, reduce the probability of screw 11 loosening, and extend the life of the capacitor.

[0035] An insulating film 3 and a resin insulating sleeve 4 located inside the insulating film 3 and wrapped around the outer side of the three-phase capacitor core 2 are placed inside the outer casing 1. The insulating film 3 and the resin insulating sleeve 4 achieve insulation between the three-phase capacitor core 2 and the outer casing 1. Environmentally friendly resin potting material is injected into the gap between the outer casing 1 and the insulating film 3 and the resin insulating sleeve 4 to fill the cavity between the outer casing 1 and the insulating film 3 and the resin insulating sleeve 4, so as to completely remove the air in the cavity and protect the capacitor core 2 in an oxygen-free state, avoid oxidation of the capacitor core 2 and contact with moisture, so that the capacitor is less likely to break down or partially discharge during charging, thereby improving the service life of the capacitor.

[0036] The insulating film 3 and the resin insulating shell 4 form double insulation. The insulating film 3 is made of PT film (polyethylene terephthalate film). The PT film has high dielectric strength, which can effectively isolate the shell 1 from the internal core, prevent breakdown, adapt to the temperature rise during capacitor operation, is not easy to age, and is resistant to oil and chemical corrosion, ensuring long-term insulation performance. It is tightly attached to the inner wall of the shell 1, reducing gaps and improving insulation reliability.

[0037] A resin insulating sleeve 4, composed of a plug-in housing 42, a front cover 43, and a rear cover 44, encloses the three-phase capacitor core 2 to prevent damage from external pressure or impact. Three plug-in holes 41 are matched to the shape of the core to ensure a fixed installation position and prevent displacement that could lead to breakage of the connecting wires 7. Environmentally friendly resin filler is used to fill the gaps.

[0038] By eliminating air, isolating oxidation and moisture, and filling the cavity between the outer shell 1, the insulating film 3, and the resin sleeve, an oxygen-free and sealed environment is created to prevent oxidation and rust of the core's metal components, while also preventing moisture intrusion that could lead to a decrease in insulation performance. The resin material can conduct heat generated during core operation, reducing temperature rise; after curing, it forms an elastic buffer layer, reducing the impact of vibration on the core. Eliminating air in the cavity (air is easily ionized, leading to partial discharge) prevents partial discharge or breakdown during charging, improving the capacitor's withstand voltage and lifespan.

[0039] The insulating film 3 is a PT film placed against the inner wall of the outer shell 1. The resin insulating shell 4 includes a plug-in shell 42 with three plug-in holes 41 for positioning and insertion of the three-phase capacitor core 2, a front cover plate 43 and a rear cover plate 44 that encapsulate the three-phase capacitor core 2 inside the plug-in shell 42 from two sides. The front cover plate 43 and the rear cover plate 44 are respectively provided with staggered placement grooves 45 that guide the connecting wires 7 on the three-phase capacitor core 2. The plug-in shell 42 is provided with a plurality of plug-in slots 46, and the front cover plate 43 and the rear cover plate 44 are provided with plug-in posts 47 that correspond to the plug-in slots 46 one by one.

[0040] The staggered placement slots 45 on the front cover plate 43 and rear cover plate 44 guide the orderly arrangement of the connecting wires 7, reducing contact between wires and lowering the risk of short circuits. The clearly defined wire channel design makes installation of the connecting wires 7 more convenient, allowing for quick positioning of the lines during later maintenance and improving assembly efficiency. The plug-in posts 47 correspond one-to-one with the plug-in slots 46, allowing for initial fixation of the front and rear cover plates 44 and the plug-in shell 42 without additional tools, followed by sealing with glue or other methods, further improving assembly efficiency. The plug-in structure reduces gaps, and with the addition of resin potting compound, further sealing prevents dust and moisture from entering the shell, protecting the core.

[0041] This high-insulation solid-state capacitor features a multi-layer insulation design (insulating layer, PT film, resin casing, and potting compound) that significantly reduces the risk of leakage and breakdown, making it suitable for high-voltage and high-reliability applications. An oxygen-free sealed environment, anti-aging materials, and vibration-damping design reduce core oxidation, moisture damage, and mechanical injury, extending the capacitor's lifespan. The modular structure (plug-in housing 42, cover plate, insulating film 3) facilitates production and assembly, while staggered wiring channels and plug-in design improve manufacturing efficiency and provide convenience for later maintenance. The environmentally friendly resin potting compound meets green production requirements, and the overall design is adaptable to complex operating conditions such as high temperature and humidity, making it suitable for a wide range of applications.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-insulation solid-state capacitor, characterized in that, include: The outer shell (1) is used to place the three-phase capacitor core (2). An insulating film (3) and a resin insulating sleeve (4) located inside the insulating film (3) and wrapped around the outer side of the three-phase capacitor core (2) are placed inside the outer shell (1). The insulation between the three-phase capacitor core (2) and the outer shell (1) is achieved through the insulating film (3) and the resin insulating sleeve (4). The cover (5) has an insulating block (6) at its bottom that is inserted into the inner side of the top of the outer shell (1). The insulating block (6) and the cover (5) are embedded with wiring ports (8) that are connected to the connecting wires (7) on the capacitor core (2).

2. The high-insulation solid-state capacitor according to claim 1, characterized in that: The insulating film (3) is a PT film placed on the inner wall surface of the outer shell (1).

3. A high-insulation solid-state capacitor according to claim 1, characterized in that: Environmentally friendly resin injection material is injected into the gap between the outer shell (1) and the insulating film (3) and the resin insulating sleeve (4) to fill the cavity between the outer shell (1) and the insulating film (3) and the resin insulating sleeve (4).

4. A high-insulation solid-state capacitor according to claim 1, characterized in that: The resin insulating housing (4) includes a plug-in housing (42) with three plug-in holes (41) for positioning the three-phase capacitor core (2), a front cover plate (43) and a rear cover plate (44) that encapsulate the three-phase capacitor core (2) inside the plug-in housing (42) from two sides.

5. A high-insulation solid-state capacitor according to claim 4, characterized in that: The front cover plate (43) and the rear cover plate (44) are respectively provided with placement slots (45) that are staggered and designed to guide the placement of the connecting wires (7) on the three-phase capacitor core (2).

6. A high-insulation solid-state capacitor according to claim 4, characterized in that: The plug-in housing (42) is provided with several plug-in slots (46), and the front cover plate (43) and the rear cover plate (44) are provided with plug-in posts (47) that are matched and plugged into the plug-in slots (46) one by one.

7. A high-insulation solid-state capacitor according to claim 1, characterized in that: An insulating layer is formed on the inside of the top port of the outer casing (1) between the outer casing (1) and the faceplate (5).

8. A high-insulation solid-state capacitor according to claim 1, characterized in that: The front and rear ends of the cover (5) are respectively provided with threaded grooves (9), and the outer shell (1) is provided with mounting holes (10) that are matched with the threaded grooves (9). The outer shell (1) and the cover (5) are fixed together by screws (11) that pass through the mounting holes (10) and are screwed into the threaded grooves (9).

9. A high-insulation solid-state capacitor according to claim 1, characterized in that: The faceplate (5) and the outer shell (1) are also bonded together with insulating adhesive.

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