The function of the vacuum pump is to extract gas molecules from the vacuum chamber, reduce the pressure of the gas in the vacuum chamber, so as to achieve the required vacuum. Generally speaking, there is a large range from the atmosphere to the very high vacuum, and so far no vacuum system can cover this range. Therefore, in order to meet the technical specifications of different products, work efficiency and equipment life requirements, different vacuum sections need to choose different vacuum system configuration.
The absolute pressure of vacuum pump means absolute pressure, which is the real vacuum pressure generated by vacuum pump. Absolute vacuum is absolute vacuum pressure. Absolute pressure = local atmospheric pressure + surface pressure (relative pressure), the smaller the absolute pressure is, the closer to vacuum!
Limit vacuum indicates that there is no substance (including molecule, atom, etc.) in this state, which is only a state of existence in theory and is impossible to achieve; it is an important parameter of vacuum pump, is the characteristic value of the pumping capacity of reaction pump, is a value related to vacuum pump, different vacuum pumps can have Different limiting vacuum; it is a concept in theoretical research and an ideal vacuum state refined by excluding the influence of various practical factors. So they are two different descriptions of the vacuum degree of the vacuum pump.
Ultimate pressure of vacuum pump:
The partial pressure is the pressure of the non condensable gas in the gas. The total pressure refers to all gases in the gas.
The pressure of the pressure. In vacuum applications, partial pressure and total pressure have their own application areas. Study on the current vacuum pump
In the nuclear standard, if the total pressure is not specified, the limit pressure index is all partial pressure. 10-3 Torr = 1.33 * 10-1 PA slide valve pump and rotary vane pump can reach; now domestic and foreign rotary vane pump can be 6 * 10-2 Pa Avenue
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