Roots Liquid Ring Vacuum Unit Working Principle

It is more advantageous for Roots liquid-ring vacuum unit to choose liquid-ring vacuum pump as the front pump than other vacuum pumps. It overcomes the limitation pressure difference of single liquid-ring vacuum pump (the unit's limitation pressure is much higher than that of water-ring pump), and has the disadvantage of low pumping rate under a certain pressure. At the same time, it retains the advantages of Roots pump that can work quickly and has a larger pumping rate. Especially, it can suit 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 when the vacuum system does not allow oil pollution. When equipped with explosion-proof motors and electrical appliances and in compliance with the corresponding safety rules, flammable and explosive gases can also be removed. Therefore, Roots pump-liquid ring vacuum pump unit is 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 light textile industry; high-altitude simulation test and other vacuum pumping systems.

Roots vacuum pump (mechanical booster pump) used in higher vacuum can not directly discharge the atmosphere. For example, the pressure difference between the suction and exhaust ports of Roots vacuum pump will be too large, which will overload the Roots vacuum pump. If the motor power of Roots vacuum pump is simply increased, the tiny gap between the rotors of Roots vacuum pump will be overheated and soon become stuck due to thermal expansion. The clearance between the rotors of Roots vacuum pump must be guaranteed in order to ensure that Roots vacuum pump can reach a higher vacuum. Therefore, the Roots vacuum pump must be equipped with a front-stage pump when it is used. When the pressure in the system is pumped to a certain range by the front-stage pump, the Roots vacuum pump can be started again, so that the overload of the Roots vacuum pump can be avoided. Front-stage pumps can choose water (liquid) ring vacuum pump, rotary vane vacuum pump, slide valve vacuum pump, reciprocating vacuum pump and other vacuum pumps that can directly discharge the atmosphere.

In general, it is more advantageous for Roots vacuum unit to choose liquid ring vacuum pump as the front pump than other vacuum pumps, mainly because it can extract a large amount of condensable vapor, especially when the mechanical vacuum pump of gas-ballast oil seal has insufficient capacity to remove condensable vapor, or the solvent used can deteriorate the performance of the pump oil, or when the vacuum system does not allow oil pollution. For obvious.

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