1. The role of lubricating oil 
Cooling effect 
As a coolant, it can effectively control the temperature rise caused by the compression exotherm;
b) Lubrication 
As a lubricant, it forms a lubricant film between the rotors;
c) sealing effect 
As a sealant, it fills the leakage gap between the rotor and the housing and between the rotor and the rotor.
d) noise reduction 
The injected oil is a viscous fluid that absorbs and dampens sound energy and sound waves. Generally, the noise can be reduced by 10 to 20 dB (A) after injection.  
2. Viscosity 
It is an indicator of the oiliness and fluidity of oil. Common viscosity indicators are dynamic viscosity and kinematic viscosity.
3. Dynamic viscosity 
There are two oil layers each with an area of 1 cm2 and a distance of 1 cm. When one of the oil layers moves relative to the other oil layer at a speed of 1 cm/s, the resistance is the dynamic viscosity. The unit is Pa•s, commonly used in mPa•s (centipoise).
4. Kinematic viscosity 
At the same temperature, the ratio of the dynamic viscosity of a liquid to its density is called the kinematic viscosity. Unit m2/s, commonly used unit mm2/s (centimeter cSt).
5. Freezing point 
The maximum temperature at which the oil stops flowing under the specified cooling conditions. It is an important quality indicator for the low temperature fluidity of lubricating oils.  
Both the pour point and the pour point are indicators of the low temperature fluidity of the oil. There is no principle difference between the two, but the measurement method is slightly different. Generally, the pour point is higher than the freezing point of 2-3 °C.
6. Pour point 
Both the pour point and the pour point are indicators of the low temperature fluidity of the oil. There is no principle difference between the two, but the measurement method is slightly different. Generally, the pour point is higher than the freezing point of 2-3 °C.
7. Flash point 
Heating the oil under the specified experimental conditions to raise the temperature, some of which evaporate or decompose to produce a flammable gas. When it is raised to a certain temperature and mixed with air, the lowest temperature at which a flash can occur when it comes into contact with the flame is called Flash point.
8. Antifoaming properties 
It refers to the performance of the foaming volume when the air is introduced into the oil or when stirring, and the speed of defoaming. In actual use, the lubricating oil is mixed into the oil due to the effects of oscillation, agitation, etc., so that the formation of bubbles causes the fluidity of the lubricating oil to deteriorate, the lubricating performance is deteriorated, and even the gas resistance affects the oil supply, so that the machine parts Unlubricated, worn or even sintered
9. Demulsibility  
The anti-emulsification property of oil refers to the property of preventing oil emulsification, or emulsification at one time, but can be rapidly decomposed by standing oil water.
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