Daily maintenance of chillers and emergency treatment

Daily maintenance of chillers and emergency treatment

Chillers are widely used in all walks of life, but generally can be divided into water-cooled and air-cooled according to the type of refrigeration. The difference between the two in installation is that water-cooling needs to be incorporated into the cooling tower before use, while air-cooling is available. Moving without other assistance, but the air-cooled chiller only relies on the fan to dissipate heat. The requirements for the environment are ventilation, humidity, temperature not higher than 40°C, and air pH. In terms of price, water cooling is much lower than air cooling; technically, the energy efficiency ratio of water cooling is 300 to 500 K cal/h higher than air cooling.

　　 Nowadays, in the production process of modern industrial machinery, precise temperature control is the main factor that promotes productivity and product quality. Therefore, the market competitiveness of the manufacturing industry depends on air-cooled chillers to help reduce temperature, improve product quality, and increase profits. The editor reminds everyone that the air-cooled chiller should also pay attention to the method of use and daily maintenance, otherwise it will lead to a decline in production efficiency.

　　Oil heater: After the unit is stopped, the compressor oil heater will be switched on to prevent the refrigerant from condensing and dissolving into the lubricating oil, causing damage to the compressor. Do not cut off the power supply even during shutdown. If the main power supply must be cut off (for long-term maintenance or shutdown periods), the compressor suction, discharge and motor cooling overhaul shutoff valves should also be closed (clockwise);

　　Pay attention to the working conditions: press the display button, read the working pressure and temperature from the control center, and check whether these values are within the operating limits given in the microcomputer control center operation manual;

　　 Refrigerant charge: After the system is started or the energy level is changed, some bubbles can sometimes be seen in the sight glass. After a few minutes of stable operation, the bubbles will disappear, and the refrigerant liquid will be seen in the sight glass.

　　In addition to daily maintenance, the editor of okmarts.com reminds users to also pay attention to troubleshooting and rapid handling of emergencies.

　　 When the air-cooled chiller suddenly cuts off the cooling water accident and fails to deal with it in time, the emergency shutdown should be performed immediately when the safety valve is taken off. The shutdown procedure is carried out according to the shutdown procedure of the safety valve. First, the compressor should be cut off immediately. Close the liquid supply valve and the liquid supply valve on the sub-regulating station. Close the suction and discharge stop valves of the compressor (the two-stage compression system first closes the low-pressure suction and discharge stop valves, and then closes the high-pressure suction and discharge stop valves). Turn the handle of the manual energy regulating valve to the zero position. Find out the reason for the sudden cooling water cut, and make corresponding treatment.

When the chiller refrigerant cycle system, the liquid refrigerant in the evaporator absorbs heat from the water and begins to evaporate. A certain temperature difference is formed between the final refrigerant and the water. The liquid refrigerant is also completely evaporated and becomes gaseous and then sucked by the compressor. Compression, the gaseous refrigerant absorbs heat through the condenser, condenses into a liquid, is throttled by the thermal expansion valve, and becomes a low temperature and low pressure refrigerant to enter the evaporator, completing the refrigerant cycle process.