Analysis of water ring vacuum pump _ how to choose

the so-called water ring vacuum pump is a kind of coarse vacuum pump, it can achieve 2000 ~ 4000 limiting vacuum of pa and pa 270 ~ 670 series of atmospheric pressure syringe. Water ring pump can also be used as a compressor, called water ring compressor, it is the pressure range of 1 to 2 x 105 Pa low-pressure compressor.

use water ring vacuum pump

the advantages of simple structure, manufacturing precision is not high, easy to processing. Compact structure, high the revolutions of the pump, usually can be directly connected to the motor, without the need for speed reducer. Therefore, under the condition of the structure of small size, can obtain large displacement, and cover an area of an area small. Compressed gas is basically isothermal, namely, the temperature of the compressed gas process changed little.

no metal friction surface due to the water ring vacuum pump cavity, so without lubrication pump, and the wear is small. Both fixed and rotating components component between the sealing can be done directly through the water seal. Suction uniform, stable and reliable running, simple operation, easy maintenance.

a, the determination of water ring vacuum pump type

the type of water ring vacuum pumps mainly depends on the quantity of air required for the operation, the exhaust pressure or vacuum.

the water ring vacuum pump, please pay attention to the following two aspects:

1. Requirements as far as possible in high efficient area operation, that is, within the scope of the critical vacuum or critical exhaust pressure.

2。 Avoid near the maximum vacuum or exhaust pressure operation. Operating efficiency is extremely low, not only in the area and the operation is not stable, easy to produce vibration and noise. For high vacuum degree of vacuum pump, often occur in this area and cavitation phenomenon, the phenomenon of clear signs is the noise and vibration in the pump. Cavitation can damage the pump body and impeller parts, so that the pump will not work.

according to the above principle, when the vacuum or air pressure needed to pump is not high, can be the first choice in the single pump. If vacuum or exhaust pressure high, generally do not meet the requirements of single pump, or demand under high vacuum pump has a larger volume, that is to say, the performance curve for at higher must keep flat under the vacuum degree of vacuum, two of which are optional. Pump. Vacuum degree above - if requirements Ring - 710 MMHG, you can use water Atmospheric pressure pumps or water ring Roots vacuum units as vacuum units.

if only be used for the vacuum pump, using single pump is the best. Because of single pump has simple structure, easy to manufacture and maintain, and under the condition of high vacuum has good resistance to cavitation. If only use large capacity compressor, double-acting pump is more suitable for use. Because the double-acting pump gas quantity is big, small volume, light weight, and the radial force can be automatically balance, so the shaft is not easy to appear fatigue fracture, and long service life of pump.

two, according to the quantity of gas required for the system of water ring vacuum pump

after the initial choice pump type for vacuum pump, also according to the quantity of gas required for the system to choose the pump type. About vacuum pump pumping speed selection and extraction time calculation, please refer to the formula of vacuum.