Cavitation phenomenon and solution of liquid ring vacuum pump Preventive measures and elimination methods of cavitation phenomenon Meanwell Waterproof Power Supply
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There are Blank : IP67 rated. Cable for I/O connection.
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The long-term operation of the liquid ring vacuum pump in the cavitation state will cause the noise and vibration of the pump to become large, and even damage the pump. Therefore, the liquid ring vacuum pump should be avoided in the cavitation state as much as possible. The following methods can be used:
1. Reducing the temperature of the working fluid Under the premise that the working point of the liquid ring vacuum pump is a fixed value, reducing the temperature of the working fluid can achieve the effect of preventing cavitation.
2. The vacuum pump is operated in a safe area to improve the accuracy of the selection. In the selection stage, when selecting the suction pressure of the liquid ring vacuum pump and the temperature of the working fluid, try to avoid the pressure range in which the liquid ring pump is prone to cavitation.
3. When the bubble generated during the cavitation protection pipeline or the one-way valve cavitation is ruptured during the compression process, the non-condensable gas with higher pressure is introduced from the outside to replenish the space due to bubble rupture in time, which can greatly Reduce the damage of the cavitation to the pump and reduce the noise and vibration caused by cavitation.
2BV and 2BE1 are provided with a cavitation protection interface. When the pump cavitation occurs, the cavitation protection interface from the exhaust side of the pump is filled with non-condensable gas to eliminate cavitation noise and greatly reduce the damage of the cavitation to the pump.
4. With the atmospheric ejector such as the liquid ring vacuum pump suction port equipped with an atmospheric ejector, the liquid ring pump is not prone to cavitation.
5. Use a liquid with a lower saturated vapor pressure as the working fluid.
6. The impeller and disc of the pump are made of materials with strong cavitation resistance.
Analysis of the reasons for the difficulty of vacuum pumping. 1) The gap between the two ends of the pump is not adjusted properly.
The bearings at both ends of the pump are double row tapered roller bearings. The two rows of double row tapered roller bearings are in contact with the outer ring and the outer ring is separated from the outer ring. There is a bearing clearance adjusting spacer between the two inner rings, that is, the original clearance of the bearing is controlled by the spacer between the two inner rings. Generally, the gap of the bearing is adjusted when it leaves the factory.
The bearing is assembled on the shaft, one of the two rows of inner rings is placed on the shoulder, and the other column is locked on the shaft by the locking back cap. After locking, the two inner rings and the spacer ring should be tightly connected together. As the shaft rotates together, the outer ring fits tightly with the bearing housing. If the thickness of the gap adjusting spacer is smaller than the original thickness, when the back cap is locked, the two inner rings and the outer ring are unconventionally pressed, so that the bearing is difficult to rotate or cannot be rotated.
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Some series are under medical standard, can use applied in medical field.
Some series is with PFC function, green and energy saving.
A : IP65 rated. Output voltage and constant current level can be adjusted through internal potential meter.
B : IP67 rated. Constant current level adjustable through output cable with 1~10Vdc or 10V PWM signal or resistance.
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