Study on Vacuum Drying and Pressure Impregnation Process and Equipment of Vacuum Power Capacitor Cai Haitao, Shao Lidong (Hangzhou Institute of Technology, Hangzhou, Zhejiang The core element is pressed into the capacitor case, and vacuum pressure impregnation is performed in another vacuum pressure impregnation tank. Integral vacuum drying and vacuum pressure impregnation process combine the above two processes into one integrated heating, vacuum drying and vacuum pressure impregnation in the same vacuum tank.This article describes the research and equipment of this process. The development.
In the production process of a power capacitor, according to a conventional process, after the core element is wound, vacuum predrying is first performed in a vacuum drying tank, and then the core element is press-fitted into the capacitor case, and then in another. The vacuum tank is vacuum-dried and the capacitor oil is vacuum impregnated. After the tank is out, it is pressurized and replenished.
Whether or not the traditional power capacitor production process can be improved, the above-mentioned several processes are merged, and integrated vacuum vacuum drying and vacuum pressure impregnation in the same vacuum tank have been beneficially explored and succeeded. The relevant contents are described below.
1 Research of the process According to the traditional production process of power capacitors, the power capacitor is made of aluminum foil, capacitor paper and polyester film and the core is crimped and flattened, and a plurality of cores are press-fitted and connected to form a core component. After vacuum pre-drying, the core components are charged into the capacitor case, and then vacuum drying and capacitor oil impregnation are performed. After the impregnation, in order to prevent the low temperature shrinkage, the oil is pressurized and reliably sealed, and finally the product is refined. Vacuum pre-drying needs to be heated to 110° C. for about 24-48 hours, and vacuum drying is required for heating to 80*C. In the entire production process of power capacitors, vacuum drying impregnation is the most important and critical process, and the process time is lengthy. Difficulty in product quality control is relatively large. Its equipment is also the most important and critical. Currently, many enterprises with behind-the-process equipment are still adopting the traditional “group soaking type†vacuum drying impregnation. Vacuum drying is performed in the tank of the vacuum tank. When the vacuum drying is completed and the impregnation is completed, the capacitor oil is directly poured into the tank truck so that the oil passes over the capacitor and the entire capacitor is When the device is immersed in oil for vacuum impregnation, the impurities and contaminants on the capacitor shell can easily contaminate the capacitor oil in the process of “vacuum soakingâ€, affecting the product quality due to the importance of the vacuum drying impregnation process, along with the product Intensified quality awareness, in the past 10 years, various manufacturers in the domestic power capacitor industry have conducted a lot of useful explorations. Some manufacturers have switched from traditional “group soaking†to “single pumpingâ€, and “Double pumping, single pumping, development, vacuum pumping system separates the vacuum pumping of each capacitor. After vacuum drying is completed, each capacitor is individually vacuum-impregnated into a vacuum heating tank in a drying room. Vacuum extraction The system not only vacuums each capacitor individually, but also vacuums the vacuum heating tank. After the drying is completed, each capacitor is vacuum impregnated separately in the vacuum heating tank for nearly a decade. The power capacitor is in vacuum. Tests and discussions on issues such as the heat transfer mechanism during the drying process and the variation of the core temperature during vacuum drying have also been reported. 31. We have also done some useful experiments and explorations in this regard. We have accumulated a lot of experience and data. According to our experiments, we have improved the production process of traditional power capacitors. Vacuum pre-drying vacuum drying vacuum impregnation pressure Several processes such as impregnation are merged, integrated vacuum vacuum drying and vacuum pressure impregnation are performed in the same vacuum tank, and PLC industrial controllers are used to automatically control the parameters such as temperature, vacuum degree, pressure, and time, and the success is achieved. The specific process is as follows: put the qualified core components into the capacitor body, connect the wires, seal and weld the shell, reserve a thin-walled copper tube interface for each capacitor, and discharge multiple capacitors neatly. On the process flat car, the process flat car has a capacitor oil impregnation tank and a vacuum suction oil injection pipe system. The stainless steel hose on the pipe system and the thin wall copper pipe of the capacitor are connected to one another, and the process flat car is pushed into vacuum. Heating tank and fixed connection is reliable; then vacuum drying vacuum impregnation and pressure impregnation are started, the whole process is about 12å±®140h, automatically controlled by PLC; After the cans are out, the thin-walled copper tubes of each capacitor are sealed and pinched by hydraulic clamps on the process car. Finally, the product is aged and tested, and the actual operation for a period of time shows that the integrated vacuum drying and the vacuum pressure impregnation Compared with the traditional process, the process shortens the process time by about 30%, reduces the human influence factors in the production process of the power capacitor, and improves the stability of the product quality and performance. In the test, we also use the “single pumping and injection method†respectively. Compared with the "double pumping and single injection" model, the "single pumping and single injection" heat transfer effect is better than the "double pumping and single injection", so the process time is slightly shorter but "single pumping and single injection" "The process has a negative atmospheric pressure on the capacitor case, so the strength of the case must be checked and the housing must be vacuum leaked beforehand, otherwise the process cannot be guaranteed."
2 The development of the equipment We designed the first fully automatic equipment in the country in the 1990s. After a long period of operation, we accumulated a large amount of process data and equipment operating data, which provided us with many real and useful experiences for our current work. In the process of equipment development, we also have some relevant information and books | 6 integrated vacuum drying and vacuum pressure impregnation The main performance indicators of the original equipment: low vacuum process vacuum degree: 3 ~ 6 3 Conclusion The traditional power capacitor production process Improvements were made, several processes were combined into a one-piece vacuum drying and vacuum pressure impregnation new process, and an integrated vacuum drying and vacuum pressure impregnation equipment was developed for this purpose. Both were successful and achieved the desired results.
After tests and actual operation for a period of time, the integrated vacuum drying and vacuum pressure impregnation process has shortened the process time by about 3% compared with the conventional process, which reduces the human influence factors of the power capacitor production process and improves the product quality. Performance stability.
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