Rotary vane vacuum pumps ( rotary vane pump for short ) is a mechanical pump seals . The working pressure range of 101325 ~ 1.33 × 10-2 (Pa) is a low vacuum . It may be used alone or as a pre- vacuum pump or other ultra high vacuum pump . It has been widely used in metallurgy , machinery, military , electronics, chemicals , light industry, petroleum and pharmaceutical production and research departments .
Rotary vane pumps can be sealed container in a dry gas , with gas ballast if the device can also be drawn in addition to a certain amount of condensable gases. But it is not suitable for high oxygen extraction , and corrosive to metal , to pump oil from a chemical reaction and gas containing dust particles .
Rotary vane vacuum pump technology is one of the most basic equipment to get the vacuum . Rotary vane pumps are mostly small and medium sized pump. There are two rotary vane pump single-stage and two-stage . The so-called dual-stage , that is, the structure will be two single -stage pump series. More dual -stage , in order to obtain a higher vacuum.
Rotary vane pump inlet pressure pumping speed and the relationship as follows: in the inlet pressure of 1333Pa, 1.33Pa and 1.33 × 10-1 (Pa) , the values of its pumping speed of not less than 95% of the nominal pump pumping speed , 50% and 20% .
Rotary vane pumps by the pump , rotor, rotary vane , end caps, springs and other components . Eccentrically mounted in the cavity of a rotary vane pump rotor , rotor cylindrical pump cavity surface tangent ( there is a small gap between the two ) , the rotor slot with a spring with two rotary vane . Rotates, the centrifugal force and the spring tension against the inner wall to the top vane is kept in contact with the pump chamber , the rotor spin- driven rotary slide along the inner wall of the pump chamber .
Two of the rotor vane pump chamber and the two end caps into a crescent-shaped space surrounded divided into A, B, C three parts, when the rotor rotates in the arrow direction , the volume of the intake port is connected to the space A gradually increasing , is in the process of breathing . The volume of space communicating with the exhaust port C is gradually reduced , and is in the exhaust process . The volume of the space B is gradually reduced centered , is in the compression process. Since the volume of the space A is gradually increased ( i.e., expansion ) , the gas pressure decreases, the outside air inlet of the pump pressure is greater than the pressure in the space A , and thus the gas inhalation. When isolated from the space A and the intake port , i.e., the space to position B , the gas starts to be compressed , the volume is gradually reduced, and finally connected to an exhaust port . When a gas is compressed more than the exhaust pressure , the exhaust valve is open compressed gas , the gas passes through the reservoir tank exhaust to the atmosphere. The continuous operation of the pump, to achieve continuous pumping. If the exhaust gas into another level ( low vacuum level ) , pumped by a low vacuum level through the airway, and then the low vacuum stage compression back into the atmosphere , which form a two-stage pump . Then the compression ratio of the two total borne , thereby increasing the ultimate degree of vacuum.
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