Capacitors need to be vacuum dried

Most of the production of high-performance capacitors must be vacuum-dried. Their function is to remove the air and moisture from the capacitor shells, electrodes and impregnants. It is generally heated or heated and vacuum dried. For some capacitor products, the temperature control accuracy required by the manufacturer is required to be as high as 0.5e. If the temperature control accuracy is lower than 2e, the performance of the product will drop greatly. For example, at higher accuracy, its withstand voltage can reach 700 to 1000V; when the temperature control accuracy is low, its withstand voltage becomes 250300V. Obviously, their production costs are the same, but different temperature control precisions are generated. The economic benefits vary greatly. Therefore, improving the precision of temperature control is the key to improving product quality and economic efficiency.

Because of the high requirements for temperature accuracy and uniformity, the higher heating requirements are put forward. Shanghai sewage pumps generally use electric heating and cooling water cooling methods. If direct heating is used, the uniformity of temperature control is more difficult to guarantee. Therefore, most of the indirect heating methods are used. Indirect heating methods first heat the intermediate heat transfer oil by the electric heating device, and then heat and dry the capacitors in the vacuum container through the heat transfer oil. Since the gas pressure in the vacuum state is very low (up to 10-1 Pa), the heat transfer oil mainly conducts heat transfer through heat radiation, and the effect of heat conduction through the gas is weak. PID control algorithm is one of the most widely used algorithms in production, with the advantages of simple algorithm, wide applicability and high reliability. Production must also consider factors such as cost, so the temperature control using PID controller, control the vacuum chamber temperature T1 can be single-loop PID control or dual-loop PID cascade control.

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