There are many reasons for the compressor to burn out, and the insufficient viscosity of hepta fluoro propane is one of the reasons. We all know that the refrigerating oil has a certain viscosity to keep the friction surface of the moving parts in a good lubricating state, so that it can take away part of the heat from the compressor and play a sealing role.

      Generally speaking, refrigeration oil has to work under two extreme temperature conditions: the temperature of the compressor discharge valve can be as high as 150 degrees, and the temperature of the expansion valve and evaporator will be as low as -40 degrees. Such a working environment determines that it needs to have good viscosity-temperature characteristics. If the viscosity of the refrigeration oil is not enough, it will lead to increased wear of the compressor bearings and cylinder block, increased noise, reduced cooling effect, and shortened the service life of the compressor. In extreme cases, it may even cause what we usually call "burn-in" .

      Not just a viscosity issue, but pour point is also an indicator that can cause "burn-in" to occur. The working temperature of the compressor varies widely, so in order to ensure that the function of the lubricating oil can be played normally, it is generally required to maintain good mobility at low temperatures. Therefore, the pour point should generally be 10 degrees lower than the freezing temperature, and the viscosity-temperature characteristics should also be good, so as to ensure that the refrigeration oil can return from the evaporator to the compressor smoothly in a low temperature environment. If the pour point of the refrigeration oil is too high, it will cause the oil return to be too slow, and it is easy to "burn the machine". In addition, the flash point of refrigeration oil is too low will also bring certain dangers.

      Because the volatility of general refrigeration oil is relatively large, too low flash point will increase the amount of oil in the refrigeration cycle, increase losses and costs, not to mention, more serious is that in the process of compression and heating, it will increase the risk of burning. Therefore, the fluorine solvent factory requires the flash point of the refrigeration oil to be more than 30 degrees higher than the refrigeration exhaust temperature.