【 Weak current College 】 refrigeration oil function, classification, and refrigeration equipment to the requirements of the frozen oil

1. What is frozen oil?
For refrigeration compressor lubrication of all moving parts in the oil, known as frozen oil, also known as the lubricating oil. In accordance with the standards of the Ministry of petrochemical industry, at present, China's production of refrigeration oil has 13, 18, 25, 30, and enterprise standard 40, five brands of refrigeration oils. Of these, the compressor lubricating oil has 13, 18 and 25, three. R12 compressor General selection R22 compressor, 18, 25, the General selection.

2. the functions of the frozen oil?
Compressor, refrigeration oil lubricated, sealing and cooling as well as four energy regulation.
(1) lubricating oil in the compressor refrigeration operates in lubrication to reduce friction and wear of compressor operation, thus lengthens the service life of the compressor.
(2) sealed refrigerant oil in the compressor have airproof effect in the compressor cylinder piston and in between, the rotation of the bearing reaches between sealed to prevent leakage of refrigerant.
(3) cooling refrigeration oil in the compressor room lubrication of all moving parts, you can take the course of the heat generated, so that the moving parts to maintain a lower temperature, thus increasing the efficiency of the compressor and the use of reliability.
(4) energy for energy regulation with adjusting mechanism of refrigeration compressors, refrigeration oil oil as an energy adjustment of mechanical power.

3. What is POE and PAG refrigeration oil?
For the protection of the ozone layer, international air-conditioning refrigerant are restricted, there are a variety of alternative refrigerants, refrigeration oil is changed. Alternative refrigerants for air conditioners for R134a, R410a, R407c/its alternative using PAG, POE.
POE is PolyolEster, also known as polyester oil, it is a kind of synthesis of alkyl class oil. PAG is the abbreviation of PolyalkyleneGlycol, is a synthesis of (b) second alcohol lubricants. Where POE oil is not only good for HFC refrigerants system, can also be used for hydrocarbon refrigerant. PAG oil is available HFC class, hydrocarbons and ammonia as a refrigerant in the refrigeration system.

4. refrigeration equipment to freeze oil what requirements?
Due to the use of occasions and different refrigerants, refrigeration equipment on frozen oil selection. On frozen oil requires the following:
(1) viscosity oil viscosity oil characteristics of frozen in one of the important parameters, use a different refrigerants to corresponding select different refrigeration oil. If frozen oil viscosity is too large to cause the mechanical friction power, friction heat and starting torque increase. Conversely, if the viscosity is too small, you will make the moving parts cannot achieve the desired oil film to achieve proper lubrication and cooling effect.
(2) cloud point refrigeration oil cloud point refers to the temperature down to a numeric value, the freezing precipitation paraffin oil begins, so that when the lubricating oil to opacity. Refrigeration devices frozen oil cloud point should be lower than the refrigerant evaporating temperature, or can cause blockage or affecting heat transfer of throttle.
(3) the freezing point of frozen oil cooling under the conditions of the experiment to stop flow of freezing point temperature is called. Refrigeration equipment for freezing point of frozen oil should lower the better (such as R22 of compressor, refrigeration oil should be at-55 ° c below), otherwise it will affect the flow of the refrigerant, increase the flow resistance, causing the heat effect bad consequences.
(4) Flash-freezing oil flash point is the lubricating oil heated to its steam and the flame of the fire occurred when contacting your temperature. Refrigeration devices Flash-freezing oil must be less than the high discharge temperature 15-30 ° c above, so as not to cause combustion of lubricating oil and coke.
(5) other antioxidants such as chemical stability and resistance, moisture and mechanical impurities and insulation performance.