Vacuum Pump System

The water-ring vacuum unit is composed of Roots pump as the main pump and water-ring pump as the front pump in series. The water ring pump selected by the water ring vacuum unit is more advantageous than other vacuum pumps, because it not only overcomes the limit pressure difference of a single water ring pump (the limit pressure of the unit is much higher than the limit pressure of the water ring pump), but also has the disadvantage of low pumping rate under a certain pressure. At the same time, the Roots pump can work quickly and has a relatively large pumping speed. The advantage of rate. It can be adapted to extract a large amount of condensable steam, especially when the capacity of gas-ballast oil-seal mechanical vacuum pump to remove condensable steam is not enough, or the solvent used can deteriorate the performance of the pump oil, or the vacuum system does not allow oil pollution. If equipped with explosion-proof motor and electrical appliances and abide by the corresponding safety rules, it can also remove inflammable and explosive gases.

Therefore, the water ring pump unit can be widely used in vacuum distillation, vacuum evaporation, dehydration and crystallization in chemical industry, freeze-drying in food industry, vacuum drying in pharmaceutical industry, polyester chips in textile industry, high-altitude simulation test, etc.

Water ring vacuum units can be divided into the following types:

Water-ring pump: The main function of water-ring pump in the unit is to create the pre-vacuum required by Roots pump. Generally speaking, the limit vacuum of single-stage water-ring pump is not high, but the pre-vacuum required by Roots pump produced in our country is relatively high. Therefore, in fact, we generally do not use single-stage water-ring pump as the pre-pump of Roots pump, but use double-stage water-ring pump with lower limit pressure. As a front-stage pump, it can also reduce the limit pressure of the unit.vacuum-pump-for-vacuum-drying

The limit pressure of a pump and a water ring pump is 400 Pa, which can meet the general vacuum demand, but its scope of use will be limited. If two Roots pumps are connected in series and then combined with the water ring pump, the limit pressure of the unit can be greatly increased (up to 25 Pa). Therefore, in this type, it is common to see two Roots pumps in series and then use two-stage pumps as the front pump to form a unit. If higher limit pressure is needed, three Roots pumps can be combined with water ring pumps, and the limit pressure can reach 1 Pa.

If the three-stage water ring unit still can not meet the limit pressure, we can use the water ring pump parallel mechanical vacuum pump. This unit is mainly used for vacuum pumping systems which need to deal with a large amount of water vapor and have a long time and very high vacuum limit, such as vacuum drying.

If a large amount of water vapor is required to be treated in the vacuum system, the use of water ring pumps is more appropriate, but because its limit vacuum is not high, resulting in the lower limit vacuum of the whole unit (this is only relative). Although mechanical vacuum pumps with higher vacuum limit are needed as front-stage pumps in vacuum pumping systems requiring higher vacuum. The mechanical vacuum pump of air-ballast and the water ring pump can be connected in parallel as the front pump of the pump. In vacuum drying, the water ring pump is first pre-pumped, until its water vapor is greatly reduced, then the mechanical vacuum pump with air ballast is started and the water ring pump is cut off. If it takes a long time to complete the drying situation, the cooling water and power required are relatively small.roots-screw-dry-vacuum-system-for-chemical-distillation