JZJLG type Roots screw pump vacuum unit

The JZJLG Roots Screw Pump Vacuum Unit is a complete set of high vacuum acquisition equipment with ZJ or ZJP Roots vacuum pump as the main pump or intermediate pump, and VPS screw vacuum pump as the front-end pump. Its structure is compact and easy to operate. In addition to the main pump, front stage pump, or intermediate pump, the unit also includes accessories such as connecting pipes, stainless steel corrugated pipes, electric contact pressure gauges, and electrical control boxes. Generally, Roots vacuum pumps and screw vacuum pumps are installed on the same frame (except for large units), as detailed in the "Unit Dimensions" section.

At present, the Roots pumps used on the unit are ordinary ZJ or ZJP Roots pumps. However, ZJ or ZJP Roots pumps can only be started after the vacuum system is pumped to the allowable starting pressure of the Roots pump by the preceding pump. Therefore, it is generally necessary to install an electric contact pressure gauge at the inlet of the unit, which can be used to control the start and stop of the Roots pump. After the current VPS screw pump is started, pre pumping of the system begins. When the system pressure (i.e. the pressure at the inlet of the Roots pump) reaches the set pressure that allows the Roots pump to start (i.e. the pressure value indicated by the green needle of the electric contact pressure gauge), the Roots pump can start working. If the inlet pressure of the Roots pump is higher than the value indicated by the green needle on the electric contact pressure gauge due to special circumstances when all pumps in the unit are in normal working condition, the Roots pump will immediately stop automatically. This can achieve automatic overload protection of the Roots pump, thereby avoiding overloading and overheating of the unit that may cause faults.

The front stage pump used in this model of Roots screw pump vacuum unit is a Korean imported equal pitch screw vacuum pump. This product is at the current level of similar products, mainly characterized by low vibration, low noise, high pumping efficiency, and reliable operation under high pressure. Due to the many advantages of the vacuum pump mentioned above, it ensures that the unit has good pumping efficiency.