2X-4 rotary vane vacuum pump

1、 Structure and principle of 2X rotary vane vacuum pump:

2X-4 rotary vane vacuum pumpRotors 3 and 7 are tangent to high vacuum chamber 1 and low vacuum chamber 6. Rotors 3 and 7 rotate in the direction of the arrows, driving the rotating blades that slide in the rotor slots to rotate. Due to the action of spring 9 and centrifugal force, the outer end of the rotating blades slides tightly against the inner surface of the high and low vacuum chambers, separating the moon shaped space formed by the rotor and the high and low vacuum chambers from the intake nozzle 2 to the exhaust valve 5 and from the exhaust pipe 4 to the exhaust valve 10, forming two or three volumes with periodic size changes. When the rotating blade vacuum pump continues to rotate in the position shown in the figure, the volumes of A and C gradually increase, and the extracted volume gas enters the pump through the intake nozzle. At the same time, the volumes of B and D gradually decrease, and the pressure increases. Then, the exhaust valve is opened. Valves 5 and 10 discharge the gas outside the vacuum chamber. The gas passes through the oil surface and is released into the atmosphere. Because the oil floods the exhaust valve, it can prevent the gas from returning to the vacuum chamber. When the pumping pressure is high, the valves of both the high and low vacuum chambers exhaust, equivalent to a single-stage pump. When the vacuum degree is high, all the gas enters the vacuum chamber and is then discharged through exhaust valve 10. At this time, the two-stage series connection enters the operation of the two-stage pump.

2X-4 rotary vane vacuum pumpWhen the extracted gas contains a high amount of vapor gas, when the gas is compressed and the partial pressure of its vapor exceeds the saturation pressure of the vapor at the pump temperature, the vapor is compressed into a liquid, which cannot be discharged by the rotary vane vacuum pump and is mixed in the vacuum oil, greatly reducing the performance of the pump. If an appropriate amount of air is added, so that the partial pressure of the steam when compressed is also lower than the saturation pressure of the pump temperature, the steam can be discharged from the pump before turning into a liquid. Therefore, pumps above 2X-4 in this series are equipped with gas injection valves that can accommodate a certain amount of gas.

2、 Performance parameters of 2X rotary vane vacuum pump：

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