Use for a long time of the roots vacuum pump, I don't know its principle -- actually

roots vacuum pump ( Called the roots vacuum pump) Vacuum water pump is rotating variables. It has evolved from the roots blower. According to the roots vacuum pump working range, it can be divided into straight exhaust environment of low vacuum roots vacuum pump, roots vacuum pump in the vacuum, Also known as mechanical booster pump) And high vacuum multistage roots vacuum pump.

to the function characteristic roots vacuum pump 1, in a very wide range of high pressure pumping speed;

2, quick start, can immediately work;

3, on pumping gas contained in the dust and water vapor is not sensitive;

4, rotor pump room without lubrication, oil free.

5, low vibration, dynamic balance of rotor is good condition, without the exhaust valve;

6, driving force is small, small mechanical friction loss;

7, compact structure, cover an area of an area small;

8, low operating and maintenance costs.

therefore, roots vacuum pump is widely used in metallurgical, petrochemical, paper, food and electronics industry.

working principle of the roots vacuum pump in the pump chamber, two '8' shape of the rotor s each other vertically mounted on a pair of parallel axis, a pair of gear transmission ratio is 1 belt running in the opposite synchronous rotation movement. Between the rotor and rotor, the rotor and the pump shell wall there is a certain gap between, in order to realize the high speed running. Due to internal compression vacuum pump, roots vacuum pump is not so compression ratio is usually very low, so in the high vacuum water pump and vacuum pump need backing pump. Roots limiting vacuum of vacuum pump is determined by the structure of the pump and the manufacturing accuracy and the ultimate vacuum pump before. In order to improve the limiting vacuum pump, can be used in series roots vacuum pump.

roots vacuum pump works similar to the roots blower. Due to the continuous rotation of the rotor, pumping the gas from the air inlet are drawn into the space between the rotor and the pump shell where v0, then discharge through the vent port. Because where v0 space completely closed after suction, so that no gas is compressed in the pump chamber and expansion. But when the top of the rotor over the edge of the vent and where v0 space and exhaust side connected, because the exhaust side of high pressure, part of the gas is returned to the space where v0, such pressure suddenly becomes higher. As the rotor continues to rotate, leave a gas pump.

roots vacuum pump rotor from 0 ° to 180 ° of the suction process. In 0 °, the lower rotor closed where v0 volume of gas from the pump inlet. When the rotating position to 45 °, connect to vent chamber. Due to high pressure of the exhaust side, back part of the gas. When go to 90 ° position, surrounded by the rotor will be returned with the gas in the gas emission together outside of the pump. At this point, the upper rotor also seal where v0 volume of gas from the pump inlet. As the rotor continues to reach 135 °, the rotor closed gas will be connected to the outlet, and repeat the process. With 0 ° 180 ° position location are the same.

the rotor in the spindle rotation a circle, a total of four where v0 volume of gas discharge.

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