The role of vacuum pump in the vacuum field is to extract gas molecules from the vacuum container, reduce the pressure of the gas in the vacuum container, and make it reach the required vacuum degree. With the rapid development of the application of vacuum industry, many manufacturers have developed many kinds of vacuum pump, its pumping rate from a few tenths of a liter per second to hundreds of thousands of liters per second, millions of liters. Generally speaking, there is a wide range from atmospheric pressure to extremely high vacuum, and so far no vacuum system can cover this range. Sometimes in order to meet the requirements of different product process indicators, working efficiency and equipment working life, different vacuum sections need to choose different vacuum system configuration.
Micro vacuum pump and gas sampling pump are often used in the field of medical instruments and instruments, with the flow rate below 20L/min. There are many kinds of micro vacuum air pumps, common rotary vane pumps, plunger pumps, film pumps and so on. In order to achieve the best configuration, the following points should be considered when selecting the micro vacuum air pump:
1. Determine the working vacuum range. Each industry has its own suitable vacuum range, the industry must first determine the vacuum required. For the gas sampling pump, if the gas itself has a certain negative pressure, then the vacuum parameters must also be considered.
2, determine the ultimate vacuum degree. Check the limit vacuum of vacuum pump system on the basis of determining the vacuum degree required by the industry, because the limit vacuum degree determines the best vacuum degree of vacuum pump. In general, the ultimate vacuum of the system is 20% lower than the operating vacuum of the system and 50% lower than the ultimate vacuum of the front stage pump. Instrument commonly used micro vacuum air pump vacuum degree can reach 10kPa.
3, determine the type, nature and pumping gas. If the delivery of high temperature, corrosive gas needs special diaphragm pump. The structure principle of each miniature vacuum pump is different. Some miniature vacuum pumps need to use lubrication and sealing liquid, which may react with the gas transported. Some may produce wear and tear, and also have to consider the pollution problem of the gas pumped. Micro diaphragm pump movement mechanism and transmission medium completely isolated, with no pollution medium, no leakage outstanding advantages, but the pumping volume is not as rotary vane vacuum pump.
To sum up, the cost performance of micro pump and sampling pump. Pump price is closely related to performance. The production of high vacuum, large flow, good reliability, long life of micro pumps, manufacturers need to have advanced fluid technology and rich experience, high-quality materials, high-precision machining and assembly, but also through long-term experiments, strict inspection selection. High technical indicators will lead to a substantial increase in pump costs. The higher the vacuum, the higher the pumping rate, the longer the life of the vacuum pump price is more expensive, so the choice of vacuum pump must be based on the actual situation of the instrument to choose!