The working principle and the structure of the roots vacuum pump characteristic _

roots vacuum pump is a kind of dual rotor displacement pump. room has two symmetrical rotor, the rotor has two leaves, trilobites and four leaf shape. Two rotor along with each other in the opposite direction, and the shaft end gear synchronous driving. The rotor do not contact with each other, and the rotor and the pump chamber wall also don't contact, and they usually exist between 0. 15 to 1. 0 mm clearance and pump chamber by the clearance seal.

as a result of the roots vacuum pump pump cavity without friction, the rotor can be high speed, generally is 1500 ~ 3000 r/min, do not need to use the lubricating oil, can realize oil-free cleaning process. The lubrication of the pump is limited to bearing and gear, as well as the dynamic seal. without reciprocating motion parts, so can achieve good dynamic balance. Therefore, roots vacuum pump running smoothly, high speed, small size, in order to obtain large pumping speed.

at present, most of the roots vacuum pump is horizontal structure at home and abroad. The air inlet of the pump is at the top, vent at the bottom. The horizontal structure has a low center of gravity and the good stability of high-speed operation. The two roots vacuum pump rotor through a pair of high precision gear relative synchronous rotation.

pump is mainly direct coupling, and large pump is belt driven. Motor and drive gear set in the sides of the rotor shaft is easy to install and remove. Drive shaft transmission torque, shaft with sufficient strength and rigidity, shaft and rotor firmly fixed. The roots vacuum pump seal is very important. Outside of the drive shaft axis, two rotor bearing and the pump chamber equipped with dynamic seal, pump room and each end cover is equipped with static seal.

in order to avoid the wrong operation of the roots vacuum pump, usually offer by-pass valve. According to the special needs of the roots vacuum pump, hydraulic gear box, bearings and other components separated from the pump cavity.

roots vacuum pump compression in the process of heat transfer to the rotor and the pump body. External rotor is difficult to transfer heat to the pump, and pump body heat loss to the surrounding atmosphere easily. Therefore, temperature difference between the rotor and the pump body. The rotor's thermal expansion. When the load increases, the pump rotor, the gap and get stuck. Therefore, there is a air-cooled roots vacuum pump, it USES the cooling of the gas or the atmosphere directly rotor cooling heat, reducing the temperature difference between the rotor and the pump shell, and improve the heat resistance of roots vacuum pump.

the air-cooled roots vacuum pump can be used for high pressure difference and high compression ratio. The pump has simple structure, the cooler and water pump outlet connection, easy maintenance and replacement. Due to the heat evenly, clearance between the rotor and the pump body can keep is very small, which is beneficial to improve the volumetric efficiency of the pump.

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