With suitable viscosity vacuum pump oil demand, the rapid start at low temperature can make the vacuum pump, vacuum pump oil at high temperature can have good sealing, within the pump vacuum pump oil has low temperature rise. It does not contain light volatile components and reduces the oil return rate of vacuum pump during operation.
2. Saturated vapor pressure of vacuum pump oil
Saturation vapor pressure is one of the key indexes of vacuum pump oil. In a closed container with constant temperature, the pressure is called saturation vapor pressure when the vapor-liquid two phases reach dynamic equilibrium.
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The saturated vapor pressure of the oil should be as low as possible. At the highest operating temperature of the pump, the saturated vapor pressure should be low enough and lower than the limit pressure of vacuum pump rules. Under the condition of 60 ℃ temperature to reach at least six. 5 x 10-5 kPa (for every temperature 20 ℃, saturated vapor pressure falling about an order of magnitude).
3. Ultimate total pressure and ultimate partial pressure of vacuum pump oil
Ultimate total pressure: the total pressure produced by all substances (gases) of the vacuum pump is measured by pyranimeter or thermocouple vacuum meter. At present, foreign countries pay attention to the test indicators of total pressure.
Limit partial pressure: the limit partial air pressure of the pump measured by the mercury tight vacuum gauge (MCT), the partial pressure of the double-stage rotary vane pump should be no more than 6 * 10-5kpa. Limit total pressure and limit pressure difference request is not more than an order of magnitude. The greater the difference between the two, the more volatile components the vacuum pump oil contains and the worse the properties of the oil.
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