Vacuum pump refers to the device or equipment that USES mechanical, physical, chemical or physicochemical methods to extract air from the pumped container to obtain vacuum. Generally speaking, vacuum pump is a device to improve, generate and maintain vacuum in a closed space by various methods. The function of vacuum pump is to remove gas molecules from vacuum chamber, reduce the pressure of gas in vacuum chamber and make it reach the required vacuum degree.

With the vacuum technology in the field of production and scientific research on the application of pressure range requirements more and more wide, most of the vacuum pumping system consists of several vacuum pumps to meet the requirements of production and scientific research process after the common pumping. Therefore, for the convenience of use and the need of various vacuum processes, various vacuum pumps are sometimes combined according to their performance requirements and used as vacuum units.

Water ring vacuum unit to roots pump as the main pump, the water ring pump for the front pump series and formed. Water ring vacuum unit is chosen as backing pump water ring pump, not only overcome the single water ring pump when using the limit pressure difference (unit limit pressure than the limit of water ring pump has greatly improved), a disadvantage of low extraction rate under certain pressure, and at the same time and keep the roots pump can work quickly, has the advantages of bigger extraction rate.

Therefore, the water ring pump can be widely used in the chemical industry in vacuum distillation, vacuum evaporation, dehydration and crystallization. Freeze drying in the food industry; Polyester chips of light textile industry; The high altitude simulation test and so on vacuum system is medium.

For the use effect of the vacuum unit we have been using, in addition to the design and material of the equipment, we should pay attention to the influence of external environment on it. These external factors can be summarized into the following aspects.

1. Steam pressure

The low steam pressure and pressure fluctuation have a great impact on the capacity of vacuum pump set, so the steam pressure should not be lower than the required working pressure, but the structure design of the equipment has been fixed, too much increase in steam pressure will not increase the pumping capacity and vacuum degree.

2. Cooling water

Cooling water plays an important role in multi-stage vacuum equipment. Condensed water can condense abundant steam. The partial pressure of water vapor in the discharge pressure is necessary to be higher than the corresponding full steam pressure.

3. the nozzle

The nozzle is an important part that affects the performance of vacuum equipment. The existing problems are: the nozzle is installed incorrectly, installed crooked, blocked, damaged, corrosion and leakage, so we should try to avoid.

4. environmental

The environment of the vacuum pump unit mainly refers to the pollution of the system by the pumped gas. In this process, some small particles, such as tiny oxidized powder skin, will be inhaled, and these small particles will accumulate and adhere to the pump body, reducing the flow conduction of the suction pipe, extending the pumping time, and decreasing the pumping energy of the pump.