Thin film capacitor for welding machine

Abstract

The utility model relates to the technical field of thin-film capacitors, in particular to a thin-film capacitor for a welding machine, which is simple in installation structure, reduces process difficulty, improves firmness and vibration resistance, comprises a shell and a capacitor core body arranged in the shell, and is characterized in that the shell is a plastic shell, and two installation pins are integrally formed on the outer wall of the shell; electrodes are welded on the two end faces of the capacitor core body, one end of the shell is provided with a plastic sealing cover, the inner side face of the plastic sealing cover is provided with a positioning column abutting against one end of the capacitor core body, and a positioning piece abutting against the other end of the capacitor core body is arranged in the shell. The housing is filled with a potting material, the potting material is used as a sealing surface of the other end of the housing, and the two electrodes respectively extend out of the potting material and the plastic sealing cover.

Description

Technical Field

[0001] The utility model relates to the technical field of film capacitors, in particular to a film capacitor for welding machines. Background Art

[0002] Film capacitors encapsulated with Mylar tape are often used in welding applications due to their low cost. However, Mylar tape itself lacks flame retardancy, is resistant to temperature fluctuations, and has a poor sealing structure, making it susceptible to moisture penetration. This results in a short capacitor lifespan and fails to meet customer needs.

[0003] The existing Mylar tape packaging structure requires double-sided potting, and its process operation is relatively cumbersome; usually customers will require additional mounting brackets for easy installation, such as Figure 1 As shown, both ends of the capacitor are supported on mounting brackets, which further increases the difficulty of the process. The mounting brackets are fixed with potting compound, which also has relatively poor firmness and vibration resistance. Summary of the Invention

[0004] In order to solve the above problems, the utility model provides a film capacitor for a welding machine, which has a simple installation structure, reduces process difficulty, and improves firmness and vibration resistance.

[0005] The technical solution is as follows: a film capacitor for a welding machine, comprising a shell and a capacitor core arranged in the shell, characterized in that the shell is a plastic shell and the outer wall is integrally formed with two mounting pins, electrodes are welded to both end faces of the capacitor core, a plastic sealing cover is provided at one end of the shell, a positioning column is provided on the inner side of the plastic sealing cover for pressing against one end of the capacitor core, a positioning piece is provided in the shell for pressing against the other end of the capacitor core, the shell is filled with potting material and the potting material serves as the sealing surface of the other end of the shell, and the two electrodes extend out of the potting material and the plastic sealing cover respectively.

[0006] It is further characterized in that the positioning piece is a cross-shaped plate, and a through hole is opened in the center of the cross-shaped plate to cooperate with the electrode;

[0007] The inner wall of the shell is provided with a clamping plate that cooperates with the positioning piece;

[0008] The inner wall of the shell is provided with reinforcing ribs.

[0009] After adopting the utility model, a plastic shell and a plastic sealing cover are used for packaging, and the process assembly and potting only requires single-sided potting, and the capacitor core is positioned by a positioning piece, the process operation is convenient, the plastic shell and the mounting pin are designed as an integrated unit, the mounting structure is simple, the installation is more secure, and the vibration resistance effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the prior art structure;

[0011] Figure 2 This is a schematic diagram of the structure of the utility model;

[0012] Figure 3 This is a schematic diagram of the interior of the utility model;

[0013] Figure 4 It is a schematic diagram of the capacitor core and positioning piece;

[0014] Figure 5 This is a schematic diagram of the arrangement of the positioning piece in the housing. DETAILED DESCRIPTION

[0015] See Figures 2 to 5 As shown, a film capacitor for a welding machine includes a shell 1 and a capacitor core 2 arranged in the shell 1. The shell 1 is a plastic shell and has two mounting pins 3 integrally formed on the outer wall. It is made of high-temperature resistant materials such as PBT or PPS. Mounting holes are provided on the mounting pins 3. Electrodes 4 are welded to both end surfaces of the capacitor core 2. A plastic sealing cover 5 is provided at one end of the shell 1. A positioning column 6 is provided on the inner side surface of the plastic sealing cover 5 to abut against one end of the capacitor core 1. A positioning piece 7 is provided in the shell 1 to abut against the other end of the capacitor core 2. The positioning piece 7 is a cross-shaped plate. A through hole is provided in the center of the cross-shaped plate to cooperate with the electrode 3.

[0016] The housing 1 is filled with a potting material 8 which serves as a sealing surface at the other end of the housing. The two electrodes 4 extend out of the potting material 8 and the plastic sealing cover 5 respectively, which facilitates subsequent wiring.

[0017] The inner wall of the housing 1 is provided with reinforcing ribs 9, which can effectively improve the strength of the capacitor, prevent the housing from being deformed, and improve the adhesion of the potting material.

[0018] The inner wall of the housing 1 is provided with a clamping plate 10 that cooperates with the positioning piece 7 , and the clamping plate 10 cooperates with the end of the reinforcing rib 9 to form a clamping groove in which the positioning piece 7 can be clamped and fixed.

Claims

1. A film capacitor for a welding machine, comprising a housing and a capacitor core disposed in the housing, characterized in that: The shell is a plastic shell and has two mounting pins integrally formed on the outer wall. Electrodes are welded to both end faces of the capacitor core. A plastic sealing cover is provided at one end of the shell. A positioning column is provided on the inner side of the plastic sealing cover to press against one end of the capacitor core. A positioning piece is provided inside the shell to press against the other end of the capacitor core. The shell is filled with potting material and the potting material serves as the sealing surface of the other end of the shell. The two electrodes extend out of the potting material and the plastic sealing cover respectively.

2. A film capacitor for a welding machine according to claim 1, characterized in that: The positioning piece is a cross-shaped plate, and a through hole matching the electrode is opened at the center of the cross-shaped plate.

3. The film capacitor for welding machine according to claim 1, characterized in that: The inner wall of the shell is provided with a clamping plate matched with the positioning piece.

4. The film capacitor for welding machine according to claim 1, characterized in that: The inner wall of the shell is provided with reinforcing ribs.

Images