What’s in the Rotary Vane Vacuum Pump Design?
The basic design of a rotary vane vacuum pump involves an oil sealed rotary displacement mechanism fitted in a special housing. The rotary displacement mechanism is a rotor which is eccentrically attached to vanes. The rotor and the vane move opposite each other, creating a centrifugal force that forces in and forces out either air or fluids through a chamber.
How Does It Work?
The set-up of a rotary vane vacuum pump operates when the rotor and vanes turn, the air or gas flows into the suction chamber until a vacuum is created when the second vane closes the chamber. The gas in the chamber is then compressed until the outlet opens when the pressure in the chamber is greater than the atmospheric pressure. The outlet is oil sealed, which allows oil to seep in gradually as the gas is released.
Other Types of Pump Designs
There are other designs for a rotary vane vacuum pump. There is a two stage design, with the use of a gas ballast. The ballast has an opening which is connected to the sealed vacuum chamber. When the air is pushed into the chamber, the pressure achieved becomes sufficient to push the outlet valve open, even at low pressure levels. This is often used with low-temperature gases, to avoid condensation during the pumping compression operation.
Oil is of the Essence
Essential to the operation of a rotary vane vacuum pump is oil. This operating fluid serves a number of purposes. Not only does it serve as lubrication for the moving parts of the pump, it also fills the gaps between the outlet ballast as well as the inlet and outlet valves. The viscosity of the oil also acts as a sealant for the vanes and absorbs temperatures that hinder the movement of the gases throughout the pump.
Clearly, a rotary vane vacuum pump is a pressurized piece of equipment that is able to push gas through its chambers towards the outlet or release valve. Any problem that arises from any individual part needs to be corrected for the proper operation of the pump.