On the Selection Method of Rotary Vane Vacuum Pump
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With the steady development of China’s annual economic growth, China’s vacuum equipment manufacturing industry has also obtained the corresponding development space. Different vacuum pumps are used in different ways, so the imported vacuum pump manufacturers and you talk about the selection method of rotary vane vacuum pump.
- The limiting pressure of the rotary vane vacuum pump shall meet the working pressure of the process. Generally, the limit pressure of the selected pump is about one order of magnitude lower than the process requirements.
- Each pump has a certain working pressure range, so the working point of the pump should be selected within this range, rather than allowing it to work under the allowable working pressure for a long time.
- Know the composition of the extracted gas, including no condensable steam, particle dust and corrosiveness. When selecting the rotary vane vacuum pump, it is necessary to know the gas composition and select the corresponding pump for the extracted gas. If the gas contains steam, particles and corrosive gas, auxiliary equipment, such as condenser, dust remover, etc., shall be installed on the air inlet pipeline of the pump.
- Principle and maintenance of rotary vane vacuum pump: rotary vane vacuum pump is a kind of variable volume mechanical vacuum pump which uses the rotary motion of rotor and the rotary vane which can slide in the rotor groove to obtain vacuum. When the working fluid is used to lubricate and fill the dead space of the pump cavity to separate the exhaust valve and the atmosphere, it is commonly known as the oil seal vane vacuum pump in each pump, and there are single-stage and double-stage. In the single-stage pump, the limit pressure and use of the pump are different because of the different structure and parameters. Their common features are simple structure, convenient use, starting from atmospheric pressure, direct discharge to the atmosphere, small eccentric mass and simple maintenance.
- The rotary vane vacuum pump can pump out the dry gas in the sealed container. If it is equipped with a gas ballast device, it can also pump out a certain amount of condensable gas. However, it is not suitable for pumping gases with high oxygen content, corrosive to metals, chemical reaction to pump oil and dust particles. Rotary vane vacuum pump is mainly composed of pump body, rotor, rotary vane, end cover, spring, etc. A rotor is installed eccentrically in the cavity of the vane pump, the outer circle of the rotor is tangent to the surface of the pump cavity (there is a very small gap between the two), and two discs with springs are installed in the rotor groove. During rotation, the centrifugal force and spring tension keep the top of the rotary vane in contact with the inner wall of the pump chamber, and the rotation of the rotor drives the rotary vane to slide along the inner wall of the pump chamber.
- When you choose the rotary vane vacuum pump, you should first understand whether your vacuum system has requirements for oil pollution.
