Working principle of the rotary vane vacuum pump -

rotary vane vacuum pump ( Known as the rotary vane vacuum pump) Is a mechanical vacuum pump oil seal. Its working pressure range is 101325 ~ 1. 33 × 10- 2 ( Pa) Is a kind of low vacuum pump. It can be used alone, also can be used as a high vacuum pump or other ultrahigh vacuum pump of the pump. It has been widely used in metallurgy, machinery, military, electronics, chemical industry, light industry, oil and medicine production and scientific research departments.

rotary vane vacuum pumps can remove dry gas in the sealed container, if installed air device, you can remove a certain amount of condensable gases. However, it does not apply to remove oxygen content is too high, corrosive to metal, to pump oil chemical reactivity and gas containing dust.

rotary vane vacuum pump is one of the most basic vacuum acquisition equipment of vacuum technology. Rotary vane vacuum pumps are mainly small and medium-sized pump. Rotary vane vacuum pump, which has two kinds of single stage and double stage. Two stage refers to the two single pump in series connection. In general, it can be divided into two stages to achieve higher vacuum degree. Rotary vane vacuum pump of the relationship between pumping speed and inlet pressure are as follows: in the inlet pressure is 1333 Pa, 1. 33 Pa and 1. 33 × 10- 1 ( Pa) When the pumping speed value shall not be lower than 95% of the rated speed of pump, 50% and 20%.

rotary vane vacuum pump is mainly composed of pump body, rotor, vane, plate, springs, etc. Rotor eccentricity to install in the cavity of rotary-vane vacuum pump, the inner surface of the outer periphery of the rotor and the pump chamber tangent ( A small gap between) And the two rotor blade is installed in the rotor slot. Rotates, the top of the rotary vane by centrifugal force and the spring tension to keep contact with the pump chamber wall, the rotation of the rotor drives the rotary vane along the wall slip pump chamber of the pump.

as shown, two rotary vane rotor, pump room and two end cover of crescent-shaped space is divided into three parts A, B and C. When the rotor rotates along the direction of the arrow, and suction connected space A volume increase gradually, and in the suction process. And vent connected space C volume decreases, and in the exhaust process. Center of space, the size of B has gradually reduced and in the compression process. Because of the space of A volume increase gradually, The inflation) , so the gas pressure is reduced, and the external gas pressure at the entrance to water pump than the pressure in the space of A strong, so the gas is inhaled.

when space A isolated from inspiratory mouth, which arrived at the location of the space B, gas begins to be compressed, volume decreases, finally connect to vent. When compressed gas than exhaust pressure, the exhaust valve be pushed away, compressed gas, gas emissions to the atmosphere through the fuel tank of oil. The continuous operation of the pump to achieve the purpose of continuous pumping. If the exhaust passage through the air and move to another level ( Low vacuum) Level, the low vacuum sucking it, then the low vacuum stage compression side by side in the atmosphere, which constitutes the two stage pump. At this point, the total score for the two stage, thus increasing the ultimate vacuum.

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