Roots rotary vane unit is a pumping unit composed of Roots pump as the main pump, single-stage or double-stage rotary vane vacuum pump as the front pump. The unit has the characteristics of high vacuum and wide range of pumping speed. It is more suitable for pumping dry and clean gas. When there is a gas ballast device, the gas containing a small amount of water vapor can also be extracted. This series of units have been widely used in metallurgy, chemical industry, light industry, petroleum, medicine, printing and dyeing, electrical appliances, electric vacuum, semiconductor, food, atomic energy, textile and other industries. The following is an introduction to its performance characteristics:
1. Roots rotary vane unit is mainly pumped by Roots vacuum pump, single-stage or double-stage rotary vane pump is used as low and high vacuum acquisition equipment of front-stage pump. The whole unit is installed on a rack, equipped with pipes, valves and electrical operation control boxes, and also equipped with cooling water pipe system. The structure of the unit is compact and easy to use. The unit has high vacuum, low noise and sustainable operation.
2. The nominal pumping speed ratio between the pumps of Roots rotary vane unit is generally between 4:1 and 10:1. In order to prevent the front vane vacuum pump from shutting down and returning oil, an electromagnetic vent valve is installed on the front pipeline. Its action is connected with the motor of the front vane vacuum pump, thus ensuring the normal operation of the pump.
3. In order to improve the pumping performance of vacuum units, to achieve a higher limit vacuum and to improve the pumping speed characteristics at low inlet pressure, and to equip large vacuum units with small-sized front pole pumps, Roots rotary vane vacuum units can also be connected in series with two-stage Roots vacuum pumps to form three-stage units according to customer requirements.
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