Screw pump middle wall

A vacuum pump is a device used to extract gas or gas mixture from a closed system to generate high vacuum pressure. It is widely used in scientific research, industrial production and laboratories, such as semiconductor manufacturing, optical film coating, electron microscopy and vacuum furnaces.

The working principle of the vacuum pump is based on two key concepts: gas pressure and gas flow. First, the vacuum pump reduces the pressure in the chamber to below atmospheric pressure through a decompression system. Then, by further reducing the pressure, the gas is expelled from the system, resulting in a vacuum state. The key components of the vacuum pump are the rotor and the cavity. The rotor creates a vacuum area by rotating, creating gas flow in the cavity. The vacuum pump can also be realized by different mechanical or physical principles, such as rotary vane pumps, vortex pumps and centrifugal pumps, etc.

The performance indicators of a vacuum pump include pumping speed, ultimate pressure and pumping rate. Pumping speed refers to the amount of gas pumped per unit time, usually in liters/second or liters/minute. Ultimate pressure refers to the maximum pressure that a vacuum pump can produce, generally expressed in Pascals (Pa) or millibars (mbar). Pumping rate refers to the time it takes for a vacuum pump to pump the system from atmospheric pressure to a specific pressure.

Different types of vacuum pumps are suitable for different applications. Rotary vane pumps are one of the most common vacuum pumps, with high pumping speeds and stable performance, suitable for medium vacuum ranges. Scroll pumps generate gas flow with their high-speed rotating edges, suitable for high vacuum ranges. Centrifugal pumps, on the other hand, discharge gas out of the system through centrifugal force, suitable for low vacuum ranges near atmospheric pressure.

When using a vacuum pump, there are some key issues to pay attention to. First, the sealing performance of the pump is very important to ensure that gas does not leak back into the system. Second, the operating temperature of the pump and the choice of lubricating oil also have an important impact on performance and life. In addition, regular maintenance and maintenance of the vacuum pump is the key to maintaining its optimal performance.

All in all, a vacuum pump is an important piece of equipment used in vacuum applications in the production and research fields. Through the principle of decompression systems and gas flow, vacuum pumps are able to generate and maintain high vacuum pressures to meet various application needs. Choosing the appropriate vacuum pump type and paying attention to maintenance and maintenance will ensure its stable performance and long life.