Low-thermal-resistance film capacitor
The design of an all-metal casing and insulating limiting components solves the problem of low heat dissipation efficiency of film capacitors, achieving efficient heat dissipation and stable installation. It is suitable for fields such as electronics, home appliances, communications, power, electrified railways, hybrid vehicles and wind power generation.
Patent Information
- Application Number
- CN202421269226.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-06-04
AI Technical Summary
Existing film capacitors, due to their plastic casing, have high thermal resistance and low heat dissipation efficiency, which limits their application environment and requires additional insulation structures.
The all-metal housing design, combined with insulating limiters, ensures accurate core positioning and facilitates heat dissipation through the gap between the metal housing and the core. The end caps are also made of metal to improve heat dissipation efficiency.
It significantly improves the heat dissipation efficiency of capacitors, eliminates the limitation of insulation structure on the installation environment, achieves more efficient heat dissipation, and ensures stable installation of the core through limiting components.
Smart Images
Figure CN223471500U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of capacitors, in particular to a low thermal resistance film capacitor. Background Art
[0002] Film capacitors use metal foil as electrodes, overlapping them with plastic films such as polyethylene, polypropylene, polystyrene, or polycarbonate, and then winding them into a cylindrical structure. Film capacitors are non-polar, have high insulation impedance, excellent frequency characteristics (wide frequency response), and very low dielectric loss. Therefore, film capacitors are widely used in electronics, home appliances, communications, power, electrified railways, hybrid vehicles, wind power generation, solar power generation, and other industries.
[0003] Existing film capacitors usually use plastic shells, which have high thermal resistance and are not conducive to the heat dissipation of the capacitor core. Utility Model Content
[0004] In order to solve the technical problems existing in the background technology, the utility model proposes a low thermal resistance film capacitor.
[0005] The utility model provides a low thermal resistance film capacitor, comprising a metal shell, a core and an end cover. The metal shell has a filling space for accommodating the core, the end cover is fixedly mounted on the top opening of the metal shell and has a notch for the pins on the core to pass through.
[0006] Preferably, the bottom end of the end cap has a protrusion that can enter into the filling space.
[0007] Preferably, the notch is clearance-matched with the pin passing through the core.
[0008] Preferably, the end cover is made of metal.
[0009] Preferably, the inner wall of the metal shell has a plurality of first limiting members extending in the radial direction thereof and made of insulating material, and the plurality of first limiting members are arranged in a circular array with the vertical center line of the metal shell as the center.
[0010] Preferably, the horizontal distance between the outer end of the first limiting member and the vertical center line of the metal shell is smaller than the radius of the core.
[0011] Preferably, the bottom end of the metal shell further has a second limiting member for supporting the bottom wall of the core, and the second limiting member is made of insulating material.
[0012] The capacitor provided by the utility model improves the heat dissipation efficiency of the capacitor through the metal shell, and the capacitor provided by the utility model is not limited by the installation environment, and the metal shell and the metal installation environment are not isolated by setting an additional insulating structure, the end cover is also made of metal material, so that the entire capacitor shell is made of metal material, thereby greatly improving the heat dissipation efficiency of the capacitor, and the first limiting piece and the second limiting piece are arranged on the metal shell, so that the core can be positioned and installed conveniently. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 A low-thermal-resistance film capacitor is provided in the utility model, and the front structure profile schematic view is shown in the figure.
[0014] Figure 2 A low-thermal-resistance film capacitor is provided in the utility model, and the top view profile schematic view is shown in the figure. DETAILED DESCRIPTION
[0015] REFERENCE Figure 1 The utility model provides a kind of low-thermal-resistance film capacitor, including metal shell 1, core 2, end cover 3, metal shell 1 has the filling space for accommodating core 2 in, end cover 3 is fixedly installed in metal shell 1 top opening, and notch 31 is set on end cover 3, and the pin on core 2 is passed.
[0016] The capacitor in the utility model adopts metal shell 1, improves the heat dissipation efficiency of the capacitor, and the filling space between metal shell 1 and core 2 can avoid the electrification of metal shell 1 and limit the assembly environment of capacitor.
[0017] In the above embodiment, end cover 3 can adopt metal or non-metal material, but part of filling glue is left in notch 31 after being extruded by the protruding part on end cover 3, and the filling glue around pin can fix pin and isolate end cover 3 and pin, so as to further improve the heat dissipation efficiency of capacitor, and the end cover 3 in the utility model is preferably made of metal material, so that the capacitor shell in the utility model is made of full metal material, thereby greatly improving its heat dissipation efficiency.
[0018] It needs to be further explained that, for the convenience of installing and limiting core 2, the inner wall of metal shell 1 is provided with a plurality of first limiting pieces 4 of insulating material extending along the radial direction thereof, and specific reference is made to Figure 2 A plurality of first limiting pieces 4 are arranged in annular array with the vertical center line of metal shell 1 as center, and when core 2 is placed into metal shell 1, a plurality of first limiting pieces 4 can limit core 2 in the radial direction of metal shell 1.
[0019] And the horizontal distance between the outer end of the first limiting member 4 and the vertical center line of the metal shell 1 is less than the radius of the core 2, when the core 2 is inserted into the filling space, due to the friction between the core 2 and the first limiting member 4, the friction can limit the core 2 in the vertical direction, avoid the filling glue to change the distance between the core 2 and the end cover 3 when filling.
[0020] In the above embodiment, in order to avoid the core 2 from contacting the bottom wall of the metal shell 1, the bottom end of the metal shell 1 is also provided with a second limiting member 5 for supporting the bottom wall of the core 2, and the second limiting member 5 is made of insulating material.
[0021] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.
Claims
1. A low thermal resistance thin film capacitor characterized by, The utility model relates to a metal shell (1), core (2), end cover (3), metal shell (1) have for accommodating the filling space of core (2) in, end cover (3) fixed mounting is on metal shell (1) top opening, and end cover (3) on set up the notch (31) of the pin on core (2) passes through, and the notch (31) with the clearance cooperation of the pin on core (2) passes through, end cover (3) adopts metal material.
2. The low thermal resistance film capacitor of claim 1, wherein The bottom end of the end cover (3) has a protruding part that can enter the filling space.
3. The low thermal resistance film capacitor of claim 1, wherein The inner wall of the metal shell (1) has a plurality of first limiting members (4) extending radially therefrom and made of insulating material, and the plurality of first limiting members (4) are arranged in a ring array with the vertical centerline of the metal shell (1) as the center.
4. The low thermal resistance film capacitor of claim 3, wherein The horizontal distance between the outer end of the first limiting member (4) and the vertical centerline of the metal shell (1) is less than the radius of the core (2).
5. The low thermal resistance film capacitor of claim 1, wherein The bottom end of the metal shell (1) also has a second limiting member (5) for supporting the bottom wall of the core (2), and the second limiting member (5) is made of insulating material.