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Refrigeration compressor refrigeration oil viscosity selection principles
each kind of frozen oil viscosity with temperature rise and have varying degrees of decline, in the refrigeration compressor should choose small oil viscosity with temperature changes.
in order to ensure the reliability of the refrigeration compressor, durability and use of economy, select the correct lubricating oil in the lubrication system is very important. Viscosity is the main performance parameters of lubricating oil, it will determine the sliding bearing of the bearing capacity of the medium oil film, the friction power consumption and the sealing surface sealing ability. High viscosity lubricating oil bearing capacity is big, easy to maintain fluid lubrication, but high temperature carbon tendency, the flow resistance is also big, increase the friction of the compressor power consumption and the starting resistance. Low viscosity lubricating oil flow resistance is small, less friction heat, but not easy to form oil film, oil seal effect is poor.
refrigerant effect on oil viscositysome refrigerant and lubricant intermiscibility is very good, in these systems, lubricating oil viscosity changes with the change of temperature with different. When the pressure in the crankcase is constant at low temperature, refrigerant levels in the lubricating oil with temperature rising and falling, the change of viscosity of lubricating oil is not only is a lubricating oil viscosity-temperature itself changes, the content changes of refrigerant has great effect on its viscosity; At high temperature, little refrigerant dissolved in lubricating oil and its viscosity is close to the viscosity of the lubricating oil itself changes.
modern high-speed compressor crankcase higher temperature ( ≥55℃) , so in the long run of the machine, you can ignore caused by dissolved with refrigerant in lubricating oil. But when the compressor shut down for a long time, crankcase pressure rise and the temperature down to ambient temperature, some refrigerants infiltration amount will increase significantly in the oil, it will lead to the oil viscosity is greatly reduced, bring after restart the adverse impact. Some solubility refrigerants, dissolved in the oil - 20% 30% when, can make the oil viscosity reduced by half, so, for this kind of refrigerant compressor can be used lubricating oil of high viscosity.
refrigeration compressor with frozen oil viscosity choice refrigeration compressor type refrigerant evaporation temperature, viscosity (℃ apply 40℃） , was/s piston type ammonia - 46 - more than 35 48 - The following 22-35 46 r12, More than 40 56 r22 - The following 32 enclosed R12-40 The following 10-40 32R22- 22 - more than 40 Inclined plate R12 air conditioning, air conditioning 56-68 Rotary screw type ammonia - 100 50 the following 56 r12100r2256 rotor type R12 32 - general air conditioning 68 r2232 - 32 (100 centrifugal R11 general air conditioning Turbine oil) Other freon 56 chloride methane 56if you are looking for frozen oil selection and doubt, welcome to consult us, unified national hotline: free of charge.
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