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Cold storage system composition control and operation process

Cold storage system composition control and operation process 1. Composition of small cold storage system As shown in the figure, the figure is a refrigeration device composed of a cold storage, mainly including: refrigeration compressor, chiller, thermal expansion valve, solenoid valve, pressure relay, time relay, temperature relay, differential pressure relay, defrost terminal, Sight liquid mirror (dry and wet mirror), oil separator, gas-liquid separator. Second, the refrigeration system principle of the cold storage: 　　The refrigerant flows to the thermal expansion valve TE through the DX drying filter, and the shut-off valve BM is installed in front of the drying filter DX, which can easily replace the drying filter. In front of each thermal expansion valve TE, there is a solenoid valve EVR, which is controlled by a temperature controller (currently used in electronic thermostats) KP61. The temperature controller switches the solenoid valve according to the temperature at the temperature sensing package F. The suction line from the evaporator of the cryogenic storage is equipped with a check valve NRV. This valve can prevent the refrigerant from flowing back to the evaporator of the cryogenic storage during the stoppage of the compressor. 　　The suction line from the evaporator of the high-temperature store is equipped with an evaporating pressure regulator KVP, which can keep the evaporating pressure fixed at 810 ℃ below the required temperature of the refrigerator compartment. The pressure controller KP15 is a high and low pressure combined controller, which can prevent the compressor suction pressure from being too low or the discharge pressure from being too high, thus protecting the refrigeration device. 　　 3. Supporting facilities 　　 Cold storage door is equipped with anti-condensation heating wire (central or separate power supply, voltage 24V), this facility can effectively ensure that the cold storage door is not frozen and condensed. The combined cold storage is generally equipped with a pressure balance window. This facility can effectively prevent the pressure in the storage from increasing and causing the slab to burst. According to the user's requirements, the warehouse door air curtain machine is installed. This facility can reduce the convection of the air inside and outside when the warehouse door is opened, and reduce the loss of cooling capacity. 　　 Fourth, the functional description of the refrigeration system 　　 (1) The refrigeration system is an automatic control system. When the temperature drops to the set value, the temperature controller and the solenoid valve are closed, the system liquid supply stops, and the pressure on the low-pressure side of the system decreases. When the pressure drops to the set value, the pressure controller operates, and the compressor control power supply and the cooling fan control power supply are cut off. , The refrigeration system stops working. Functional description of refrigeration system (2) Turn on automatically. After the storage temperature rises back to the set value, the temperature controller acts, the solenoid valve is electrically turned on to supply liquid, and the pressure in the low-pressure side of the refrigeration system rises. When the pressure rises to the set system, the pressure controller acts, and the compressor and cooler The control power is turned on and the refrigeration system starts to operate. 　　 (3) Other functions of pressure controller. In addition to the above functions, the pressure relay can also protect the system when the pressure on the high and low pressure sides of the system is too high. (4) Function of differential pressure controller. The oil pressure gauge of the differential pressure relay can reflect the lubricant (refrigerating oil) supply state of the compressor. The pressure difference is the difference between the discharge oil pressure of the oil pump and the suction pressure. Under normal conditions, the difference should be greater than 1.5kg/cm2 (pressure Table value); When the pressure value is less than 1.5kg/cm2, the differential pressure controller automatically stops within 60s of operation to avoid the compressor running under poor lubrication. 　　 (5) "Electronic protection" function. When the compressor is a semi-hermetic compressor, the motor coil is set on the low pressure side. Under normal circumstances, the heat generated by the coil operation is cooled by the low-pressure working gas. When the heat of the coil is increased due to some reason and the cooling is not good, the heat of the coil will increase cumulatively, and in severe cases, the coil will be burned. "Electronic protection" can effectively ensure that the motor runs under normal temperature rise. (6) The function of the water flow relay. The water flow relay ensures that the water-cooled unit operates in the presence of water. If the cooling water does not flow in the pipe or the water flow is insufficient, the water flow relay is off and the compressor cannot run. 　　 (7) The crankshaft heating wire is installed in the compressor crankcase. When the compressor works, the heating tube stops working; when the compressor stops working, the heating tube works. The crankshaft heating wire raises the temperature in the crankcase, evaporates the working fluid in the mixed liquid into gas, thus ensuring the purity of the freezing oil and the liquid level of the freezing oil. When the compressor is running, it guarantees the moving parts Good lubrication between.

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