Navigation

×

What do you know about dry (oil-free) screw vacuum pumps?The core technology of dry screw vacuum pump is a pair of precision machining spiral rotor, the suction and exhaust gas equipment generated by synchronous high-speed reverse rotation in the pump housing, it is an updated product of oil-sealed vacuum pump, which can remove a lot of water steam and a small amount of dust gas occasions.It is widely used in domestic pharmaceutical, chemical, semiconductor and other enterprises with high requirements for clean vacuum.The following Jiangsu Quantianxia intelligent Equipment Co., Ltd. will introduce the working principle and structural characteristics of the screw vacuum pump in detail.

• The working principle of dry screw vacuum pump

Dry screw vacuum pump inhales gas through the main and slave rotors meshing rotation to enlarge the closed space of the suction section. After the gas is sucked into the pump chamber, with the continuous operation of the pump, under the helical meshing rotation of the main and slave rotors, the closed space moves from the intake end to the exhaust end, and the pressure rises steadily without intermediate exhaust phenomenon.When the closed space is connected with the exhaust port, the gas in the exhaust channel recoils to the pump chamber, causing the gas pressure and temperature in the pump chamber to rise, and causing airflow noise;As the pump continues to operate, the volume of the enclosed space begins to gradually shrink, and the gas in the pump chamber is constantly discharged.

Dry screw vacuum pump features: the rotor structure is more complex, the precision requirements are higher, the rotor processing difficulty is higher, the processing time is longer;At the same time, the screw vacuum pump has low operating power, low noise and low operating temperature.

● Screw rotor

The screw rotor is made of high grade spherical graphite cast iron, precisely manufactured by special CNC equipment, and passed the accurate G1 dynamic balance test.

● Tooth wheel

The gear is one of the most important components on the screw vacuum pump, which can keep a fixed gap between the screw rotor and the rotor.This series of screw vacuum pump adopts high precision helical gear structure, meshing uniform, good stability, low noise.

● Shaft bearing

The fixed end bearings are double row angular contact ball bearings, and the extended end bearings are cylindrical roller bearings.These bearings are able to withstand high speed and high load operation while maintaining precise clearance with gears and rotors.

● Shaft seal

The sealing structure adopts labyrinth seal + inflatable seal + dry seal, which can completely block the passage between the lubricating oil chamber and the pump chamber to prevent the lubricating oil and the pumped gas from spreading and polluting each other.

● Lubricating oil

The gear of the vacuum pump is lubricated with lubricating oil, and the amount of lubricating oil should be added to the middle line of the oil mirror slightly, but it must not pass the oil mirror.If the amount of oil is too little, the amount of lubricating oil entering the flow cycle in the oil chamber is less, the bearing and gear are not effectively lubricated, and will be damaged by abnormal friction;At the same time, the flow of lubricating oil is less, and the gear and bearing can not be effectively cooled, which will affect the service life of the vacuum pump, and even failure.The oil chamber of the vacuum pump is equipped with a special cooling system to cool the lubricating oil.Therefore, when the pump maintenance, maintenance, please regularly check the amount of oil and oil pollution status, to decide whether to increase or replace the lubricating oil.