The working principle of rotary vane vacuum pump

Rotary vane vacuum pump is mainly composed of the stator, rotor, rotary, cover, spring and other parts.Its structure is the use of eccentric loading in rotor stator cavity (cylindrical rotor and the stator’s inner surface tangent the gap between the two is very small) and rotor slot against sliding by spring tension and centrifugal force on the inner wall of the stator, the two pieces of rotary vane, when the rotor rotates, always slide along the lining of the stator.

Two rotary vane rotor, stator inner cavity and cover the crescent space surrounded by is divided into A, B, C three parts, as the rotor rotates, the mines with inspiratory mouth space A continually increases, the volume of A space, reduce the pressure constantly, when A space inside the pressure is less than the pressure of the pump container, according to the principle of balance of gas pressure, the gas is pumped continues to be draw in suction chamber A, is in the process of suction.B cavity volume of the space is gradually reduced, the pressure increases continually, is in the process of compression.Interlinked with vent space volume decreases, and further C C pressure further increase of the space, when gas pressure is greater than the exhaust pressure, pushed open the discharge valve, the compressed gas is pumped gas continuously through the fuel tank in the reservoir and discharge into the atmosphere, in the process of the continuous operation of the pump, continuously carrying on the suction, compression, exhaust process, so as to achieve the purpose of continuous extraction.

Exhaust valve in the oil in order to prevent the air into the pump, the oil clearance on the pump body, oil hole and the exhaust valve into the pump chamber, make all the surface for the movement of the pump cavity is covered in oil, formed the suction chamber and exhaust cavity seal, oil is full of all harmful space at the same time, in order to eliminate them to limit the effects of vacuum.

Roots pump including the pump body;Rotary vane;The rotor;Spring;Exhaust valve

Double stage rotary vane vacuum pump working principle diagram Advanced exhaust valve, channels, low exhaust valve

two stage rotary vane vacuum pump is composed of two studios, two rooms series, before and after the same constant speed rotation, Ⅰ chamber is low vacuum level, Ⅱ chamber is high vacuum level, gas is pumped by the air inlet into the Ⅱ chamber, when entering higher gas pressure, gas compression by Ⅱ chamber, the pressure increases rapidly, the compressed gas not only from a senior exhaust valve, and through the wall of the channel, into the Ⅰ chamber, in Ⅰ chamber is compressed, low exhaust valve discharge;When into the Ⅱ chamber gas pressure is low, although Ⅱ chamber of compression, also push not to open advanced exhaust valve discharge, gas into the Ⅰ chamber wall in all the channels, via Ⅰ chamber to compression, from a lower exhaust valve discharge, so the double rotary vane vacuum pump is higher than the limit of single-stage rotary vane vacuum pump vacuum.

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