Sealing of overflow valve of slide valve vacuum pump

The sealing degree of the exhaust valve directly affects the problem that the gas in the oil tank slightly higher than atmospheric pressure flows back to the pump cavity. If the valve is not closed tightly, it will seriously affect the vacuum degree of the vacuum pump. The main reason for the loose closing is that the valve plate is deformed, cracked, or the valve plate is not guided properly when it is bouncing, which causes the valve plate to stay.

If the exhaust valve is not closed in time, the vacuum degree of the pump will also be affected. For example, in order to reduce the power consumption and noise in high vacuum, when the composite exhaust valve combining the compression valve and the floating valve is used, the single-stage pump will not have problems generally. When the double-stage pump is used, because the pressure difference between the low true cavity and the oil tank is relatively small, especially when the rotating speed is high, the floating valve will not appear The phenomenon of timely closing affects the vacuum degree of the slide valve vacuum pump. If floating valve is used in the overflow valve of high true cavity of two-stage pump, the problem will be more prominent because the pressure difference between two sides is smaller.

The spring force of exhaust valve can be smaller on the premise of ensuring the valve tightness. If the pressing force is too large, the power consumption will be increased. In the past, the compression force of some imitated pump springs was up to 1.2x105pa. Through our repeated tests, it was found that 1.02 ~ 1.1x105pa was suitable, which not only reduced the power consumption, but also reduced the noise.

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