Vacuum pumps and compressors work in the same way, basic types and basic structures are basically the same, but they also have differences, mainly in the following aspects.

1, the difference between the impeller circumferential speed range

The peripheral speed of the impeller is mainly determined by the pressure difference between the suction chamber and the compression chamber. Since the suction pressure of the compressor is generally atmospheric pressure, and the discharge pressure of the vacuum pump is generally atmospheric pressure, the pressure difference of the compressor is large, and the required peripheral speed is also large.
Reasonable circumferential speed. The range of μ2 (m/s) is roughly as follows:
Compressor 18≤μ2≤24
Vacuum pump 14≤μ2≤17
The range of the optimal impeller circumferential speed (ie, the speed around the impeller near the efficiency drum height) is different:
Compressor μ2 excellent = 23-24 m / s vacuum pump μ excellent = 16 m / s or so can be seen that the same water ring pump, when used as a vacuum pump and when used as a compressor, the performance is different, the vacuum pump is changed to compression When the machine is used, it can only work economically if the speed is increased accordingly.

2, the structural difference of gas-water separator

The gas-water separator of the vacuum pump is flat-topped, the overflow pipe is a common water pipe, and the top of the gas-water separator of the compressor is spherical, and the overflow pipe is controlled by a float regulating valve to prevent the water level from being below the overflow pipe. The compressed gas escapes, reducing gas pressure and effective gas volume.

3, the optimal compression ratio range is different

The so-called optimal compression ratio, that is, the compression ratio at a higher efficiency. In general, the optimum compression ratio of a vacuum pump is higher than that of a compressor.

4, the difference in the size of the vent

At the same size, the venting port of the compressor is smaller than that of the vacuum pump.

5, the difference in shaft power

The same size of the water ring pump, the effective power when used as a compressor is larger than that of the vacuum pump, and the current peripheral speed of the impeller is generally selected according to the requirements of the vacuum pump, so that when used as a compressor, it is operated in an inefficient area. The required shaft power is even greater. Therefore, the power of the compressor is larger than that of the vacuum pump.

At present, the principle of one machine and two uses is adopted. The same water ring pump is used for vacuum pump or compressor, and is equipped with the same speed motor, and the size of the exhaust port does not change, only the power of the matching motor is selected. And the type of the gas-water stand is selected separately considering their differences.