Compressor oil return there are two ways: one is the oil separator oil return, the other is the return pipe oil return.
Oil separator installed in the compressor exhaust line, generally can be separated from 50-95% of the running oil, back to the oil effect is good, fast, greatly reducing the amount of oil into the system pipeline, thus effectively extending the time of operation without oil return.
Piping particularly long cold storage refrigeration system, full liquid ice system and very low temperature freeze-drying equipment, etc., after the start-up of more than ten minutes or even dozens of minutes after the return oil or oil back to the very small amount of the situation is not uncommon, the poorly designed system will be the compressor oil pressure is too low and the shutdown of the problem. This kind of refrigeration system installation of high-efficiency oil separator can greatly extend the compressor no oil return operation time, so that the compressor safely through the crisis stage of no oil return after the start. The lubricating oil that is not separated out will enter the system and flow with the refrigerant in the tube, forming an oil cycle. The lubricating oil enters the evaporator.
On the one hand, because of the low temperature solubility is small, part of the lubricating oil from the refrigerant to separate out; on the other hand, the temperature is low viscosity, the separated lubricating oil is easy to adhere to the inner wall of the tube, the flow is more difficult. The lower the evaporation temperature, the more difficult to return to the oil. This requires evaporation piping design and return air piping design and construction must be conducive to the return of oil, the common practice is to use the descending piping design, and to ensure that a larger air velocity.
Post time: Jan-10-2024