Being able to correctly grasp the maintenance and maintenance essentials of industrial chiller, and carrying out the necessary reasonable maintenance and maintenance of industrial chiller are an important factor in reducing the probability of failure of industrial chiller and increasing the service life of machinery, and how to properly maintain and maintain it Industrial chiller is also the main content and the topic around this chapter!
I. Chiller maintenance and repair
1 . Screw compressor Screw compressor is a very critical component in the unit. The quality of the compressor is directly related to the stability of the unit. If the compressor fails. As the installation accuracy of screw compressors is high, it is generally necessary to ask the factory for repairs.
2 . The cooling water of the condenser and evaporator cleaning water-cooled condenser is an open circulation circuit, and the tap water generally used is circulated through the cooling tower for reuse. When the content of calcium and magnesium salts in water is large, it is easy to decompose and deposit on the cooling water pipe to form scale, which affects heat transfer. Excessive scaling will also reduce the cross-section of the cooling water, reduce the amount of water, and increase the condensation pressure. Therefore, when the quality of the cooling water used is poor, the cooling water pipe is cleaned at least once a year to remove scale and other dirt in the pipe.
3． After replacing the lubricating oil unit for a long time, the oil quality of the lubricating oil becomes worse, and the impurities and moisture inside the oil increase. Therefore, the oil quality should be observed and inspected regularly. Once the problem is found, it should be replaced in time. The oil grade to be replaced must conform to the technical data.
4. Drying filter replacement is an important part to ensure the normal circulation of the refrigerant. Because water and refrigerant are incompatible with each other, if the system contains water, it will greatly affect the operating efficiency of the unit. Therefore, it is very important to keep the interior of the system dry. The filter element inside the drying filter must be replaced regularly.
5. Safety valve calibration The condenser and evaporator on the screw chiller are pressure vessels. According to regulations, a safety valve must be installed on the high-pressure side of the unit, that is, the condenser body. Once the unit is in an abnormal working environment, The safety valve can automatically relieve the pressure to prevent possible injury to the human body caused by the high pressure. Therefore, the regular verification of the safety valve is very important for the safety of the entire unit.
6. Refrigerant charge:
If there is no other special reason, the unit will not produce a large number of leaks. If due to improper use or after maintenance, a certain amount of refrigerant leaks. You need to add refrigerant again.
Second, the annual maintenance
1. Clean the condenser (cumulative operation once every six months). 2. Clean the cooling tower (water-cooled cumulative operation for cleaning once every three months). 3. Check the refrigeration oil and lubricating oil system, and replace and replenish if necessary. 4. Check and maintain the main engine circuit system. 5. Compressor motor coil insulation test. 6. Check if the drying filter is normal and if it is blocked, replace it if necessary. 7. Check the amount of refrigerant and replenish it in a timely manner. 8. Check and correct the high and low pressure switches. 9. Check and correct the thermostat. 10. Test run and total calibration, test whether the overheating is normal, and whether there is abnormal sound in each component.
Adhering to the correct application of the above-mentioned ten-point maintenance techniques for the maintenance of industrial chiller equipment will greatly extend the service life of mechanical equipment and reduce the frequency of mechanical failure!