The sign of the normal operation of the refrigeration unit 1. There is no knocking sound in the piston refrigeration compressor, the compressor is operating normally, the expansion valve opening is adjusted properly, and there is only compressor suction and exhaust sound during operation, and no knocking or other abnormal sounds are produced.
2.The temperature of each friction part of the compressor is normal, and there is no heat shock. The friction parts of the compressor, the bearings and the journal are in good contact, and the lubrication is normal, and no shock heat exceeding 30°C or higher than the ambient temperature is generated. 3. The oil level of the crankcase is in the normal position. The normal oil level of the crankcase of the general compressor should be in the middle of the sight glass. If it is two oil mirrors, the normal oil level should be on the center horizontal line of the upper oil mirror, but the minimum should not be lower than the center horizontal line of the lower oil mirror or no oil level can be seen. In addition, the oil should not foam during the operation of the compressor. 4. The oil pressure is normal. Compressors using pressure lubrication require a lubricating oil pressure of 0.1 to 0.15Mpa or 1 to 1.5kgf/cm2. If the compressor is equipped with a hydraulic unloading energy adjustment device, the lubricating oil pressure is required to be 0.15 to Within 0.3Mpa (0.15～0.3kgf/cm2).
Before , a friend asked the Refrigeration Encyclopedia public number, what harm does the oil pressure be too low or too high? Answer here. Too low oil pressure will cause dry friction on the surface of each friction part or unload an energy adjustment mechanism to act slowly; too high oil pressure will not only damage the oil pump shaft, keys and transmission parts, but will also cause too much oil between the friction surfaces, Increase frictional resistance. At the same time, more lubricating oil enters the refrigeration system, resulting in a reduction in the heat exchange effect of the heat exchange equipment and an increase in the oil consumption of the compressor. In addition, the oil temperature in the crankcase should not exceed 70°C or below 5°C. If the oil temperature is too high or too high, it will affect the oil pump's oil absorption and lubrication effect. 5. There is no frost on the compressor. During the operation of the refrigeration system, the frost on the compressor return line should be a normal phenomenon, but when the operation is poor or the expansion valve is not adjusted properly, it will often cause frost on the compressor cylinder wall and the body. In severe cases, it may cause compressor "liquid strike".
6. The auxiliary equipment of the refrigeration system is in a normal working state, the expansion valve is properly opened; the fans and motors are running smoothly; the water pump of the water circulation system is running normally, and there is no abnormal noise; there is no serious water leakage in the water circulation pipeline and each connection; more important What is necessary is that there is no refrigerant leakage in the connecting pipelines of all equipment in the refrigeration system. 7.All pressure and temperature indications of the refrigeration system are correct, and the pressure gauge and temperature gauge pointers are stable; the high and low oil pressure controllers are adjusted properly, and they can play an automatic control and safety protection role within the required pressure value range. 8. The liquid level of the refrigerant in the liquid reservoir meets the requirements. When the refrigeration system is working normally, the liquid level of the liquid reservoir should be at the 1/3~2/3 position of the sight glass. The outlet temperature of the condenser is stable, and the temperature difference between the inlet and outlet water is preferably in the range of 8 to 12°C. 9. When the refrigeration system is working normally, its condensing pressure and condensing temperature, evaporating pressure and evaporating temperature are in a corresponding relationship. The condensing pressure and temperature depend on the cooling water temperature and water supply. For example, the gauge pressure of R22 refrigerant condensing pressure is 1.3Mpa---1.6Mpa, and the maximum is not more than 1.9Mpa (19kgf/cm2).
