Detailed analysis of three major systems of cryogenic cooling cycle device

The low temperature coolant circulation device (cooling water circulation machine) is a water cooling device that can provide constant temperature, constant current, constant pressure cooling water equipment. The working principle is to first inject a certain amount of water into the water tank, cool the water through the refrigeration system, and then send the low-temperature cooling water to the equipment to be cooled by the water pump. The chilled water will take away the heat and then the temperature will increase and then return to the water tank. To achieve the cooling effect. Cooling water temperature can be automatically adjusted according to requirements, long-term use can save water. Therefore, the cryogenic coolant circulation device is a standard energy-saving device.

The Industrial Low Temperature Coolant Circulation Unit Group consists of three systems: a water circulation system, a refrigerant circulation system, and an electrical automatic control system.

One water circulation system:

The water circulation system is a pump that draws water from the tank to a device that the user needs to cool. The chilled water brings the heat away and the temperature rises before returning to the freezing tank.

Two refrigerant circulation system:

The liquid refrigerant in the evaporator absorbs the heat in the water and begins to evaporate. The liquid refrigerant also completely evaporates into a gaseous state and is then inhaled and compressed by the compressor (pressure and temperature increase). The gaseous refrigerant passes through the condenser (air-cooled/water-cooled). Absorb heat and condense into liquid. After thermostatic expansion valve (or capillary tube) throttling, it becomes low-temperature and low-pressure refrigerant to enter the evaporator to complete the refrigerant cycle.

The basic composition of the refrigeration system Compressor: The compressor is the core component of the entire refrigeration system, and is also the source of refrigerant compression power. Its role is to convert the input electrical energy into mechanical energy, inhale, compress and transport the refrigerant vapor to drive the cycle.

Condenser: In the cooling process, the condenser functions to output thermal energy and condense the refrigerant. After the high-pressure superheated steam discharged from the refrigerant compressor enters the condenser, all the heat absorbed in the working process, including the heat absorbed from the evaporator and the refrigerant compressor and in the pipeline, is transferred to the surrounding medium (water or Air) away; refrigerant high pressure superheated steam recondenses into liquid.

Drying filter: In the refrigerating cycle, moisture and dirt must be prevented from entering. The source of moisture is mainly the trace amount of moisture contained in the newly added refrigerant and lubricating oil, or the moisture due to the air entering during the inspection of the system. If the moisture in the system is not eliminated, when the refrigerant passes through the throttle valve (thermoexpansion valve or capillary), the pressure and temperature will sometimes cause the water to freeze into ice, blocking the channel and affecting the normal operation of the refrigeration device. Therefore, a dry filter must be installed in the refrigeration system.

Throttle valve: The thermal expansion valve (or capillary tube) is installed in the refrigeration equipment between the dry filter and the evaporator. The temperature-sensing package of the thermal expansion valve is wrapped at the outlet of the evaporator. Its main function is to make high-pressure refrigerant liquid at room temperature reduce the pressure when passing through the thermal expansion valve, and turn into low-temperature and low-pressure refrigerant vapor (most of which is liquid and a small part of which is steam) to enter the evaporator and vaporize in the evaporator. Endothermic, and achieve the purpose of refrigeration cooling.

Evaporator: An evaporator is a heat exchanger that absorbs the heat of the cooled medium by means of evaporation (actually boiling) of the refrigerant liquid. Its function in the refrigeration system is to absorb heat. In order to ensure that the evaporation process can be carried out stably and permanently, the vaporized gas must be continuously withdrawn by the refrigeration compressor to maintain a certain evaporation pressure.

Refrigerant: Most industrial cryogenic coolant circulation devices used in modern industry use R22 or R407C as refrigerants. Refrigerant is a working fluid in a refrigeration system. Its main function is to carry heat, and to achieve heat absorption and heat release when the state changes.

Three electrical automatic control system:

The electrical automatic control system includes a power supply part (main circuit) and an automatic control part (control circuit). The main circuit part is the power supply to the compressor, fan, water pump, etc. through the contactor. The control circuit part includes the temperature controller, pressure protection, delayer, relay, overload protection and other combination to achieve automatic start and stop, protection and other functions according to the water temperature.