Rotary vane pumpsĀ are positive-displacement pumps consisting of vanes mounted to a rotor that rotates inside of an oil-sealed cavity. These moving vanes transport volumes of gas through the system and out of an outflow.
Rotary Vane Pump Principles
TheĀ above diagramĀ illustrates the pump action. The rotary action of theĀ pump creates a hollow space in the chamber (1) which expands as the pump rotates. As the chamber expands, the pressure in the chamber decreases. As a result, gas is drawn into the chamber due to the difference in pressure between the chamber and the inletĀ (4) to the chamber. The inlet is the only place where gas can flow into the chamber.
Once the vane (3) moves past the inlet (4), it seals the inlet against the chamber (1) and the gas becomes trapped between the two vanes (2 and 3). The chamber (1) then begins to decrease in volume as the rotor revolves toward the exhaust port (5), compressing the gas. The pressure of the compressed gas becomes greater than atmospheric pressure. When the vane (2) moves past the exhaust port (5) the compressed gas in the chamber is forced out through the exhaust port. This expansion/compression cycle constitutes one complete cycle of the pump. This cycle is repeated as the vane (2) passes the intake port and seals it against the atmosphere. Two pump cycles are performed during each revolution of the pump rotor.
As this type of pump requires oil in the system regular oil changesĀ are required for optimal performance.Ā A common pump feature to assist with this is a sight glass which allows easy viewing of the oil level and facilitates deciding when it needs changing.
Two pump stages (2 and 1) are arranged in series in order to improve the end pressure and the pumping speed at lower pressures. The intake takes place in the first stage (1), the compression and the outlet in the second stage (2).
These pumps are able to achieve a higher compression ratio giving much lower vacuums than diaphragm pumps, so are often used in more demanding applications such as freeze drying, degassing, vacuum ovens and concentrators.
Benefits
TheĀ CRVpro rangeĀ of Rotary Vane Vacuum Pumps provides an extensive selection of pump sizes (tables below) with the following benefits:
High reliability for stable operation and long product lifespan
Can you give me another information from that vacuum pump, like the lower pressure that vacuum can work because I need vacuum with lower pressure for my research. Then, how much it is? Thank you very much!
Hi Giovanni,
Thanks for your comment on our blog, for more options of vacuum pumps and pricing please email export@camlab.co.uk
Kind regards
Emma
Camlab Tech Support
Rotary vane pumps are positive-displacement pumps consisting of vanes mounted to a rotor that rotates inside of an oil-sealed cavity. These moving vanes transport volumes of gas through the system and out of an outflow. Thanks for this amazing information.
Thanks for sharing such a great information.. It really helpful to me.. I always search to read the quality content and finally i found this in you post. keep it up!
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TheĀ above diagramĀ illustrates the pump action. The rotary action of theĀ pump creates a hollow space in the chamber (1) which expands as the pump rotates. As the chamber expands, the pressure in the chamber decreases. As a result, gas is drawn into the chamber due to the difference in pressure between the chamber and the inletĀ (4) to the chamber. The inlet is the only place where gas can flow into the chamber.
Once the vane (3) moves past the inlet (4), it seals the inlet against the chamber (1) and the gas becomes trapped between the two vanes (2 and 3). The chamber (1) then begins to decrease in volume as the rotor revolves toward the exhaust port (5), compressing the gas. The pressure of the compressed gas becomes greater than atmospheric pressure. When the vane (2) moves past the exhaust port (5) the compressed gas in the chamber is forced out through the exhaust port. This expansion/compression cycle constitutes one complete cycle of the pump. This cycle is repeated as the vane (2) passes the intake port and seals it against the atmosphere. Two pump cycles are performed during each revolution of the pump rotor.
As this type of pump requires oil in the system regular oil changesĀ are required for optimal performance.Ā A common pump feature to assist with this is a sight glass which allows easy viewing of the oil level and facilitates deciding when it needs changing.
Two pump stages (2 and 1) are arranged in series in order to improve the end pressure and the pumping speed at lower pressures. The intake takes place in the first stage (1), the compression and the outlet in the second stage (2).
These pumps are able to achieve a higher compression ratio giving much lower vacuums than diaphragm pumps, so are often used in more demanding applications such as freeze drying, degassing, vacuum ovens and concentrators.
