A kind of film capacitor core vacuum heat treatment method

Abstract

The invention discloses a vacuum heat treatment method for a film capacitor core, which comprises the following steps: coating the film capacitor core with insulating high-temperature-resistant rubber rings near the two ends; placing the film capacitor core in a core tank and passing through the tank The lid is sealed; the core tank is evacuated by a vacuum pump; the core tank is placed in an oven with air in it; the temperature rise program of the oven is set, and then the oven is started to perform heat treatment according to the preset temperature; after the oven heat treatment program is completed , Take out the film capacitor core, remove the rubber ring, and complete the vacuum heat treatment of the film capacitor core. The present invention significantly improves the local heating uniformity of each part of the core of the film capacitor, and the shrinkage of the capacitor is consistent, the air gap and internal stress of the capacitor are improved, the voltage resistance and charge and discharge capacity of the capacitor are significantly improved, and the service life of the capacitor is improved. The vacuum pump used for vacuuming has low power and low noise, which is beneficial to energy saving and noise reduction.

Description

technical field [0001] The invention relates to a processing method for a film capacitor core, in particular to a vacuum heat treatment method for a film capacitor core. Background technique [0002] With the development of modern science and technology, the replacement cycle of electronics, home appliances, communications and other industries is getting shorter and shorter. With its good electrical performance and high reliability, metallized film capacitors have become indispensable electronic components to promote the upgrading of the above industries, and are widely used in aviation, aerospace, weaponry and other military fields. In recent years, with the further development of digitization, informatization, and network construction, the country’s increased investment in power grid construction, electrified railway construction, energy-saving lighting, hybrid vehicles, etc., and the upgrading of consumer electronics products, film capacitors, especially The application ...

AI Technical Summary

Problems solved by technology

[0005] 1. The air in the vacuum oven is thin and there is no air convection. The oven mainly relies on radiation heating to raise the temperature. The temperature difference between different positions in the oven is large, and the capacitor core is directly stacked in the vacuum cavity. Different parts of the capacitor core are heated unevenly. The shrinkage is inconsistent, and there are air gaps and stresses inside the product, which increases the air gap and internal stress of the product, reduces the withstand voltage capability and charge and discharge capacity of the capacitor, and reduces the service life of the capacitor

[0006] 2. The cavity of the oven is too large, the power of the vacuum pump required is large, the production noise is large, the degree of vacuum is relatively difficult to achieve, the efficiency is not high and the energy consumption is large

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