The working principle of the vacuum unit: a vacuum pump that pumps the gas by moving the gas in a synchronous and reverse rotation of a pair of leaf-shaped rotors in the pump chamber. The Roots vacuum unit is a mechanical vacuum pump with a pair of synchronous high-speed rotating sole-shaped rotors. This pump can not be pumped separately. The front stage needs to be equipped with an oil seal, a water ring, etc. The Roots pump works like the Roots blower. Due to the continuous rotation of the rotor, the pumped gas is drawn from the intake port into the space v0 between the rotor and the pump casing, and then discharged through the exhaust port.

Since the v0 space is fully closed after inhalation, the gas is not compressed and expanded in the pump chamber. However, when the top of the rotor turns over the edge of the exhaust port and the v0 space communicates with the exhaust side, since the gas pressure on the exhaust side is high, a part of the gas is returned to the space v0, so that the gas pressure suddenly increases. When the rotor continues to rotate, the gas exits the pump. The Roots pump is in the pump chamber, and two "8"-shaped rotors are mounted perpendicularly to each other on a pair of parallel shafts, and a pair of gear belts having a transmission ratio of 1 are rotated in synchronism with each other. Between the rotors, there is a certain gap between the rotor and the inner wall of the pump casing to achieve high speed operation.

Working characteristics of the vacuum unit: 1 The pumping speed is faster in the working pressure range; 2The vibration is small and the operation is stable; 3The friction is small, the high speed can be obtained without lubrication; 4The structure is simple and compact; 5 pairs of dust and water in the gas Vapor is not sensitive; 6 compression is relatively low, the effect of hydrogen pumping is poor; 7 rotor surface processing and inspection is more difficult; 8 quick start, low power consumption, low operating and maintenance costs.

Vacuum unit application: Roots vacuum unit is widely used in the matching of single crystal furnace and ingot furnace, as well as vacuum coating, vacuum drying, etc. in various applications such as coating, electrician, smelting, chemical, ceramic, aviation, laboratory, etc. Vacuum degassing, vacuum impregnation, vacuum brazing, vacuum heat treatment, vacuum concentration, vacuum reaction, high altitude simulation test, etc., it can not be used alone, it can be used with the front valve of the valve vacuum pump, screw vacuum pump, rotary vane vacuum pump, water ring vacuum pump, etc. The pump is used in a vacuum unit to obtain a good vacuum and high pumping efficiency.