CN218525460U

CN218525460U - Axial thin film capacitor

Info

Publication number: CN218525460U
Application number: CN202222652208.4U
Authority: CN
Inventors: 郑路; 李小龙; 刘文昌; 杨琪
Original assignee: Ningguo Yuhua Appliance Co ltd
Current assignee: Ningguo Yuhua Appliance Co ltd
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2023-02-24
Anticipated expiration: 2032-10-09

Abstract

The utility model discloses an axial film capacitor, including electric capacity core and plastic casing, the electric capacity core includes that the film rolls up the core and connects the electrode at film roll core both ends, and plastic casing has the cavity that can hold the film roll core, and plastic casing's one end is equipped with the communicating opening with the cavity to the one end relative with the opening is equipped with first extraction electrode mounting hole, is equipped with the epoxy encapsulation layer between the film roll core of electric capacity core and plastic casing's the cavity inner wall, and the electrode of electric capacity core one end passes first extraction electrode mounting hole. This axial film capacitor replaces the PET sticky tape through plastic casing, and the core can be followed the opening of plastic casing one end and packed into, and epoxy pours into through the open end again and encapsulates, can not appear the space between plastic casing and the electric capacity core, and not only convenient production still makes the leakproofness of electric capacity core good, can improve the humidity resistance of electric capacity core.

Description

Axial thin film capacitor

Technical Field

The utility model relates to a film capacitor technical field especially relates to an axial film capacitor.

Background

The axial capacitance refers to the capacitance of the leads of the two poles on the same axis. Generally, the wire is a non-inductive structure, and is wound by using a metallized polyester film as a dielectric/electrode, the wire is a tinned copper clad steel wire (or soft wire), the outer layer is wrapped by a polyester adhesive tape, and two ends are sealed by epoxy resin.

But the sealing performance of the PET tape and the epoxy resin bonding surface of the axial capacitor is poor, and pores are easy to appear when the PET tape is manufactured and wrapped, so that the core is poor in sealing performance, external moisture is easy to invade into the core, a metal layer of a film coating is oxidized, and the capacitance attenuation phenomenon is caused.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem who exists among the background art, the utility model provides an axial film capacitor.

The utility model provides an axial film capacitor, including electric capacity core and plastic casing, wherein:

the capacitor core comprises a film roll core and electrodes connected to two ends of the film roll core;

the plastic shell is provided with a cavity capable of accommodating the film roll core, one end of the plastic shell is provided with an opening communicated with the cavity, and the end opposite to the opening is provided with a first extraction electrode mounting hole;

an epoxy resin packaging layer is arranged between the film roll core of the capacitor core and the inner wall of the cavity of the plastic shell, and an electrode at one end of the capacitor core penetrates through the first lead-out electrode mounting hole.

Preferably, the inner wall of the cavity of the plastic shell opposite to the opening is provided with a positioning column.

Preferably, the capacitor further comprises an end cover plate, a second extraction electrode mounting hole is formed in the end cover plate, the edge of the end cover plate is matched with the opening of the plastic shell, and an electrode at one end of the capacitor core penetrates through the second extraction electrode mounting hole.

Preferably, the inner end of the end cover plate is provided with a connecting column, and the connecting column is embedded in the epoxy resin packaging layer.

Preferably, the cross-section of the plastic housing is a rounded rectangle.

Preferably, the plastic housing is circular in cross-section.

The utility model discloses an axial film capacitor replaces the PET sticky tape through plastic casing, and the core can be packed into from the opening of plastic casing one end, and epoxy encapsulates into through the open end of rethread, can not appear the space between plastic casing and the electric capacity core, and not only convenient production still makes the leakproofness of electric capacity core good, can improve the humidity resistance of electric capacity core.

Drawings

FIG. 1 is a perspective view of an axial thin film capacitor proposed in the example;

FIG. 2 is a perspective view of a capacitor core and a plastic case of the axial film capacitor in the embodiment;

fig. 3 is a sectional view of an axial thin film capacitor in an embodiment.

Detailed Description

Referring to fig. 1-3, an axial thin-film capacitor according to an embodiment of the present invention includes a capacitor core 1 and a plastic housing 2. The capacitor core 1 comprises a film roll core 11 and electrodes 12 connected to two ends of the film roll core 11, wherein the film material of the film roll core 11 is a metallized polyester film. The plastic case 2 has a cavity for receiving the film roll core 11, and one end of the plastic case 2 is provided with an opening 21 communicating with the cavity, and the end opposite to the opening 21 is provided with a first extraction electrode mounting hole 22. An epoxy resin packaging layer 3 is arranged between a film winding core 11 of the capacitor core 1 and the inner wall of the cavity of the plastic shell 2, and an electrode 12 at one end of the capacitor core 1 penetrates through a first lead-out electrode mounting hole 22.

When the axial thin-film capacitor is produced, the electrode 12 at one end of the capacitor core 1 can pass through the first lead-out electrode mounting hole 22, and then epoxy resin is poured into the opening 21 of the plastic shell 2 for encapsulation. Therefore, the axial thin-film capacitor is simple to produce, the capacitor core 1 is packaged through the plastic shell 2 and the epoxy resin, no gap can be formed between the plastic shell 2 and the capacitor core 1, the capacitor core 1 is good in sealing performance, and the moisture resistance of the capacitor core 1 is improved.

In the present embodiment, the inner wall of the cavity of the plastic housing 2 opposite to the opening 21 is provided with a positioning column 23. The main effect of reference column 23 is when packing into 2 inner chambers of plastic casing with electric capacity core 1, can make the film roll up and can reserve certain clearance between core 11 and the plastic casing 2, thereby make the epoxy who fills flow to and roll up core 11 with the film and encapsulate completely in the clearance, consequently can guarantee through reference column 23 when the encapsulation leakproofness is good, make things convenient for the production of electric capacity more, do benefit to improvement production efficiency.

The axial thin-film capacitor of the embodiment further comprises an end cover plate 4, a second extraction electrode mounting hole 41 is formed in the end cover plate 4, the edge of the end cover plate 4 is matched with the opening 21 of the plastic shell 2, and the electrode 12 at one end of the capacitor core 1 penetrates through the second extraction electrode mounting hole 41. According to the axial film capacitor with the end cover plate 4, the sealing performance can be further improved, and the epoxy resin packaging layer 3 can be prevented from being exposed to the outside and being easily damaged to cause sealing failure.

Furthermore, the inner end of the end cover plate 4 is also provided with a connecting column 42, and the connecting column 42 is embedded in the epoxy resin packaging layer 3. The connecting strength between the end cap plate 4 and the epoxy resin encapsulation layer 3 can be increased by the connecting posts 42.

The cross section of the plastic housing 2 of the axial film capacitor of the present embodiment is a rounded rectangle. In some other embodiments, the cross-section of the plastic housing 2 may also be circular.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. An axial film capacitor comprising a capacitor core (1) and a plastic housing (2), wherein:

the capacitor core (1) comprises a film roll core (11) and electrodes (12) connected to two ends of the film roll core (11);

the plastic shell (2) is provided with a cavity capable of containing the film winding core (11), one end of the plastic shell (2) is provided with an opening (21) communicated with the cavity, and the end opposite to the opening (21) is provided with a first extraction electrode mounting hole (22);

an epoxy resin packaging layer (3) is arranged between a film winding core (11) of the capacitor core (1) and the inner wall of the cavity of the plastic shell (2), and an electrode (12) at one end of the capacitor core (1) penetrates through the first lead-out electrode mounting hole (22).

2. Axial film capacitor according to claim 1, characterized in that the inner wall of the cavity of the plastic housing (2) opposite the opening (21) is provided with positioning studs (23).

3. The axial film capacitor as claimed in claim 1, further comprising an end cover plate (4), wherein the end cover plate (4) is provided with a second lead-out electrode mounting hole (41), the edge of the end cover plate (4) is fitted with the opening (21) of the plastic case (2), and the electrode (12) at one end of the capacitor core (1) passes through the second lead-out electrode mounting hole (41).

4. An axial film capacitor according to claim 3, wherein the inner end of the end cap plate (4) is provided with a connection post (42), the connection post (42) being embedded in the epoxy encapsulation layer (3).

5. An axial film capacitor according to any of claims 1-4, characterized in that the cross-section of the plastic housing (2) is rounded rectangular.

6. An axial film capacitor according to any of claims 1-4, characterized in that the cross-section of the plastic housing (2) is circular.