How to judge whether the refrigeration equipment is in normal working condition

How to judge whether the refrigeration equipment is in normal working condition

The relevant valves and equipment in the system are in their proper state. The compressor suction and discharge valves, the inlet and outlet valves of the oil separator, and the inlet and outlet valves of the condenser and accumulator are all in the correct opening position; the throttle valve opening degree Appropriate; all fans and motors run smoothly; the water pump of the water circulation system operates normally without abnormal sound; there is no serious water leakage in the water circulation pipeline and its connections; in the cold storage with cooling piping or cold storage air cooler, the exhaust pipe or air cooler The coils are evenly covered with "dry frost"; the joints of the Freon refrigeration system should not leak oil (oil leakage indicates refrigerant leakage), and the valves and connections of the ammonia system should not have obvious ammonia leakage.

　　 Condensing pressure and condensing temperature, evaporating pressure and evaporating temperature correspond to each other. Evaporating temperature and pressure depend on the required refrigeration temperature. During operation, the evaporating pressure should be similar to the suction pressure of the compressor. The condensation temperature and pressure depend on the temperature of the cooling medium and its flow. In general, for refrigeration compressors of the national standard series, the maximum condensing pressure of R22 and R717 does not exceed 1.8MPa (gauge pressure). During operation, the condensing pressure is close to the compressor discharge pressure and accumulator pressure. If not, it is abnormal.

　　 The water pressure of the cooling water of the horizontal shell and tube condenser should be above 0.12MPa, and a certain inlet water temperature and water volume must be guaranteed; while the air-cooled condenser should maintain a certain inlet air temperature, air volume and wind speed on the windward side. Touch the shell of the horizontal shell and tube condenser with your hands, you should feel the upper part is hot and the lower part is cold. The temperature difference between the inlet and outlet water of the vertical condenser is about 2 to 4°C, and that of the horizontal condenser is about 4 to 6°C.

　　 The level of refrigerant in the accumulator meets the requirements. The liquid level of the accumulator should be at the position of 1/3～2/3 of the liquid level indicator during normal operation.

　　The automatic oil return pipe of the oil separator with automatic oil return is used when it is cold and hot. Generally, the heating and cooling cycle is about 1h. The filter and solenoid valve coil on the liquid pipeline of the refrigeration system should be warm, and there should be no obvious temperature difference before and after, and there should be no frost and condensation, otherwise it will be blocked.

　　 The throttle valve body is frosted or evenly condensed, and no thick frost is allowed at the inlet. When the refrigerant liquid passes through the throttle valve, only a dull small sound can be heard.

　　 The protection devices on the equipment, such as safety valves, bypass valves, etc., should be opened and closed flexibly, and the control devices, such as pressure controllers, differential pressure controllers, temperature controllers, etc., should have correct setting values ​​and operate normally. The pointer of the pressure gauge should be relatively stable and flexible. The thermometer indication is correct.