【 Weak current College 】 compressor maintenance of refrigeration oil use---Power By 【 China power house network 】

Compressor as HVAC refrigeration industry of core and cost the most expensive parts, its performance and maintenance has always been our industry personnel and users are most concerned about. The author has been engaged in research and development of the compressor, the compressor in the use, maintenance, including the use of frozen oil express personal opinions, and I hope to help the vast number of peers. A, compressors and refrigeration oil match 1, in respect of the use of refrigerant compressors for refrigeration oil requirements for matching. Including the environmentally friendly refrigerant R134a, matching is a synthetic ester R22 refrigerant oil; while waiting for non-environmentally friendly refrigerant matching is mineral frozen oil. 2. in respect of the use of working on the compressor refrigeration oil requirements for matching. Air conditioning compressors match is at 40 ° c in kinematic viscosity range 30-50 of frozen oil; freezing, refrigeration compressors match is at 40 ° c in kinematic viscosity range 20-40 of frozen oil; high temperature of screw compressors match is at 40 ° c range of kinematic viscosity at 100 above freezing oil; refrigerator compressor matching is at 40 ° c in kinematic viscosity range 20-40 of frozen oil; 3, various types of compressors for refrigeration oil matching table (see table 1) and the world famous brand compressor and refrigeration oil matching table (see table 2) (by Ningbo Kei refrigeration industry co., Ltd.)

Second, the compressor used frozen oil skills 1, frozen oil usage. Refrigeration oil capacity to control the whole refrigeration system is installed, try post runs, from the compressor as liquid mirror on frozen oil back to the location of the oil should be at the centre line as liquid mirror. The oil is too high can cause refrigerant was too diluted, resulting in low productivity of the refrigeration; return oil too low can cause the frozen oil lubrication, heat insulation, seals, and so the performance decrease. So when the installation of the unit's pipeline is long, and should be appropriate to add matching of refrigeration oils. 2. refrigeration oil replacement. Compressor should be kept in a clean, orderly working conditions. For best operation, security, and compressor service life, maintenance and periodic inspection including frozen oil replacement. Refrigeration oil replaced with clean filters, in the new compressor runs continuously after 100-200 hours, for the first time, a year later to the replacement. Of course, replaced refrigeration oil we have to follow the State's requirements for waste oils, otherwise it will cause insecurity and pollution. 3. synthetic ester use frozen oil. When using environmentally friendly refrigerants, refrigeration compressor synthetic ester oil, only such oil can guarantee and refrigerant good mixed sex. But the need is that frozen synthetic ester oil has strong Hygroscopicity. This installation of refrigeration system engineers and operations staff on equipment cleanness and dryness in processing makes much higher. Refrigeration system safe operating conditions is the residual humidity < 100ppm. Residual humidity > 100ppm could cause damage to the entire system. 4. each mineral mix of frozen oil. Different brand frozen oil at the same time is the viscosity can be mixed. Manufacturers in this respect the test. According to Germany has more than 70-year history of the compressor manufacturer blog compressor test results indicate that the DEA, MO-BIL FUCHS, ICI and LUBIL frozen oil with the same and real time with the same viscosity can be mixed. As standard refrigeration oil, FUCHS DEA Reniso SP 46 pre note in Bock compressors. It can be for example LUBIL frozen oil blend 4GS.

3. compressor oil problems for example

1, high paraffin content. When the compressor working temperature is reduced to a value, the freezing precipitation paraffin oil begins to freeze oil become cloudy. Frozen precipitation paraffin oil, the equivalent is the accumulation of excess, the throttle valve to throttle valve plug or may accumulate in the evaporator surface heat transfer performance, impact.
The following figure is LUBIL3GS frozen oil and a frozen oil on paraffin content comparison chart
2. pour point is too high. Refrigeration oil cooling under the conditions of the experiment to stop flow of temperature is called the pour point. In refrigeration systems, heat-exchange equipment and piping, usually at low temperatures, while the pipe wall or less oil film appear, how oil pour point is too high can affect the flow of the refrigerant, increase the flow, affecting heat transfer efficiency. In General, for refrigeration equipment, the lower their pour point should be better. In the refrigeration system design time, frozen oil pour point must be less than the system minimum evaporation temperature 5 ° c.
The following figure is LUBIL3GS frozen oil and a frozen oil on the pour point of comparison chart
3. chemical stability. Pure freeze oil chemical stability, oxidation, corrosion of metal will not. However, when frozen oil contains refrigerant or moisture will produce corrosive effect, oil oxidation produces acidic compounds, corrosion of metal. When refrigeration oils at high temperatures, coke, if this substance attached to the valve plate, will affect the normal operation of the valve plate, while at the same time can cause blockage of the filter and throttle valve. Therefore you must use a chemical stability and oxidation resistance are good refrigeration oil. Figure 5, 6-freezing oil chemical stability of low carbon issues caused by the product. (4), mechanical impurities and moisture content exceeded. If frozen oil containing water, will increase oil chemical change, caused by the oil deterioration, corrosion of the metal, while the throttle valve or expansion valve Department causing the blockage. The lubricating oil containing impurities, exacerbate moving parts wear, friction surface quickly clog filters and throttle valve or expansion valve, refrigeration lubricants should not contain mechanical impurities. IV. selection of refrigerating oil 1, watch brand. Refrigeration oil in the compressor factories factory are prefabricated in future maintenance as long as the choice of original prefabricated refrigeration oil is foolproof, but in practice the compressor factory for precast oil price is very expensive. Our maintenance staff to reduce costs, choose alternative refrigeration oil. Quality in the market and the price is guaranteed to receive the products mainly include SUNISO, LU-BIL etc. brand. 2, see color. For refrigeration oil of quality problems in the simplest way is to look at the oil productsColor. Mineral oil for normal freezing is transparent ming, if slightly turbid or color is deep in the impurities that oil and paraffin content is high. Ester synthesis frozen oil normal color is transparent with Ming Huang, a mineral oil on the deep, the higher the kinematic viscosity of the color is darker, when reached 220 viscosity, color performance-Ming Huang with red. These insights have anomalies would welcome comments and suggestions of our colleagues and friends. Table 1: table 2: