Scope of application:
Roots Slide Valve Vacuum Unit has remarkable energy-saving effect. It has high vacuum degree and large pumping capacity in high vacuum interval. It can be widely used in vacuum impregnation and vacuum drying of transformers, wires, cables and capacitors in power industry. It is an ideal vacuum equipment for vacuum coating, vacuum smelting, vacuum heat treatment, vacuum oil filtration, freeze-drying and aviation simulation test. If a small amount of water vapor or dust is sucked, a filter device should be installed.
Structure and characteristics:
Roots sliding valve vacuum unit is a vacuum unit consisting of a common Roots pump as the main pump and a sliding valve vacuum pump as the front pump in series. By means of vacuum relay or electric contact pressure gauge, the automatic opening and closing and overload protection of sliding valve pump of Roots pump can be realized. The whole unit is installed on a rack, equipped with pipes, valves, electrical operation control box and cooling water pipe system. The unit is compact in structure and easy to use.
According to the size and limit pressure of the pumped vacuum system, the nominal pumping speed ratio between pumps of the vacuum unit is between 4:1 and 10:1. The former is more suitable for large vacuum system and long-term operation under low pressure inlet pressure or limit vacuum condition than the latter. In order to prevent the return of oil when the sliding valve pump stops, an electromagnetic inflatable valve is installed on the front inlet pipeline. Its action is linked with the motor of the front pump. When the sliding valve pump stops, it inflates gas into the pump mouth to ensure that the vacuum oil in the sliding valve pump returns to the oil tank, and to prevent the vacuum system from being polluted by the vacuum oil.