1、 water ring vacuum pump example
The example of water ring vacuum pump is mainly determined by the required volume and vacuum degree.
When selecting the water ring vacuum pump, it is necessary to pay attention to the following two aspects:
1. Try to operate in the high efficiency area, that is, the area with critical vacuum degree or critical exhaust pressure.
2. It should be spared that it is operating at the maximum vacuum or exhaust pressure. Running in this area, not only the effect is very low, and things are not stable, it is difficult to have vibration and music. For vacuum pumps with high vacuum degree, when they are operating in this area, they will often have cavitation phenomenon, which is marked by music and vibration in the pump. Cavitation will lead to the damage of pump body, impeller and other parts, so that the vacuum pump can not work.
According to the above criteria, when the vacuum required by the vacuum pump is not high, it is preferred to pull out the single-stage pump. If the vacuum degree is about high exhaust pressure, the single-stage pump is not always satisfied. In general, the requesting pump is in a high vacuum degree and still has a large amount of space. That is to say, the requesting function curve is relatively flat when the vacuum degree is high, so whether to choose the two-stage pump. If the vacuum degree is above – 710mmhg, do you choose water ring – air pump or water ring – roots vacuum unit as vacuum pumping assembly.
If it is only used as a vacuum pump, it is better to use a single inductive pump. Because of its simple structure, simple creation and protection, and high cavitation resistance under high vacuum. If it is only used for large-scale compressor application, the single acting pump is selected and the comparison is consistent. Because of the large volume, small volume and light weight of the single induction pump, the radial force can be actively balanced, the shaft has no simple fatigue fracture, and the application life of the pump is long.
2. Select the vacuum pump according to the air volume required by the system
At the beginning of the selection of the water ring vacuum pump example, to deal with the vacuum pump, but also according to the air system required to select the water ring vacuum pump model. For the selection of pumping speed of vacuum pump and the debate of pumping time, please refer to the debate formula of vacuum contest.