JZJ Roots Vacuum Pump-Mechanical Vacuum Pump Unit
This type of vacuum unit is a high vacuum acquisition equipment with Roots vacuum pump as the main pump and oil seal mechanical vacuum pump as the front pump. The whole unit is installed on a rack, equipped with pipes, valves and electrical control boxes. The structure of the unit is compact and easy to use.
As the main pump, there are ZJ type ordinary Roots vacuum pump and ZJB type Roots vacuum pump with bypass valve. The latter has better pumping performance than ZJ type Roots vacuum pump.
The front-stage pumps for this type of vacuum unit include two-stage rotary vane vacuum pump, single-stage rotary vane vacuum pump or sliding valve vacuum pump.
In order to improve the pumping performance of vacuum units, to achieve a higher limit vacuum, to improve the pumping speed characteristics at low inlet pressure and to equip large vacuum units with smaller specifications of the front pump, this type of vacuum unit also has three-stage units connected by two-stage Roots vacuum pump in series.
According to the size of the vacuum system and the gas state, the nominal pumping speed ratio between the pumps of the vacuum unit is generally between 4:1 and 10:1. The former is suitable for large vacuum system and long-term operation under low inlet pressure or limit vacuum.
This type of vacuum unit is suitable for pumping air and other non-condensable and non-corrosive gases. It is widely used in various vacuum systems requiring large pumping speed and high vacuum, such as vacuum smelting, kinetic energy vacuum acquisition in large-scale space simulation test, vacuum impregnation treatment of power capacitors, transformers, exhaust gas from fluorescent tube and automatic production line of bulbs. Vacuum flask continuous exhaust, pre-extraction in vacuum coating equipment, exhaust in magnesium reduction process, degassing in single crystal silicon refining process and so on.