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How to choose a liquid ring vacuum pump？
The type of liquid ring vacuum pump is mainly determined by the amount of gas, vacuum or exhaust pressure required for operation.
When the pump is working, you need to pay attention to the following two aspects:
1. As far as possible, it is required to operate in the high efficiency zone, that is, in the region of critical vacuum or critical exhaust pressure.
2. Avoid operating near large vacuum or large exhaust pressure. Operating in this area is not only extremely inefficient, but also unstable and prone to vibration and noise. For vacuum pumps with a high degree of vacuum, cavitation often occurs in this area, and the obvious sign of this phenomenon is noise and vibration in the pump. Cavitation can cause damage to parts such as the pump body and impeller, so that the pump cannot work.
According to the above principle, when the vacuum or gas pressure required by the pump is not high, it can be selected firstly in the single-stage pump. If the degree of vacuum or exhaust pressure is high, the single-stage pump is often unable to meet, or the pump is required to have a large volume at a higher vacuum, that is, the performance curve is required to be flat at a higher vacuum, and two are optional. Stage pump. If the vacuum is required to be above -710 mmHg, an optional water ring-atmosphere pump or a water ring-Roots vacuum unit is used as the vacuuming device.
If it is only used as a vacuum pump, it is better to use a single-acting pump. Because the single-acting pump is simple in construction, easy to manufacture and maintain, and has good cavitation resistance under high vacuum conditions.
If only a large volume compressor is used, it is more suitable to use a double acting pump. Because the double-acting pump has a large gas volume, small volume, light weight, the radial force can be automatically balanced, the shaft is not prone to fatigue fracture, and the service life of the pump is long.
After selecting the type of pump initially selected by the vacuum pump, for the vacuum pump, the model of the pump should be selected according to the amount of gas required by the system.
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