What Type Of Vacuum Pump Should I Choose?
Jun 29, 2019| First, the determination of the type of vacuum pump
The type of vacuum pump is mainly determined by the amount of air, vacuum or exhaust pressure required for operation.
When working with a vacuum pump, you need to pay attention to the following two aspects:
1. It is required to operate in the high efficiency zone as much as possible, that is, in the area of critical vacuum or critical exhaust pressure.
2. Avoid operating near maximum vacuum or maximum exhaust pressure. Operating in this area is not only extremely inefficient, but also unstable in operation 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 vacuum pump. Cavitation can cause damage to parts such as the vacuum pump body and the impeller, so that the vacuum pump cannot work.
According to the above principle, when the vacuum degree or gas pressure required by the vacuum pump is not high, it can be selected firstly in the single-stage vacuum pump. If the vacuum or exhaust pressure is high, the single-stage vacuum pump is often unable to meet, or the vacuum 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 can be used. Stage vacuum pump. If the vacuum is required to be above -710mmHg, an optional water ring-atmosphere vacuum pump or a water ring-Roots vacuum unit can be used as the vacuuming device.
If it is only used as a vacuum pump, it is better to use a single-acting vacuum pump. Because the single-acting vacuum 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 vacuum pump. Because the double-acting vacuum pump has a large gas volume, small volume, light weight, and the radial force can be automatically balanced, the shaft is not prone to fatigue fracture, and the service life of the vacuum pump is long.
Second, select the vacuum pump according to the amount of gas required by the system
After the initial selection of the type of vacuum pump, for the vacuum pump, the model of the vacuum pump is also selected according to the amount of gas required by the system.
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