Working principle of low-temperature coolant circulation device

The working principle of Shanghai Bilang cryogenic coolant circulation device.

The working principle of the low-temperature cooling fluid circulation device: The low-temperature cooling fluid circulation device (cooling water circulation machine) is a kind of water cooling equipment, which can provide constant temperature, constant flow and constant pressure cooling water equipment. Its working principle is to inject a certain amount of water into the internal water tank of the machine, 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. , To achieve the role of cooling. Cooling water temperature can be adjusted automatically according to requirements, long-term use can save water. Therefore, the low-temperature coolant circulation device is a standard energy-saving equipment.

Cooling principle of industrial low-temperature coolant circulation device

The industrial low-temperature coolant circulation device group includes three systems: a water circulation system, a refrigerant circulation system, and an electric appliance automatic control system.

One water circulation system:

The water circulation system is a device that Pumps water from the water tank to the user to be cooled. The chilled water takes the heat away and the temperature rises, and then returns to the chilled water tank.

Second 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 sucked and compressed by the compressor (pressure and temperature increase). The gaseous refrigerant passes through the condenser (air-cooled / water-cooled) Absorbing heat, condensing into liquid, throttling through thermal expansion valve (or capillary), and turning into low-temperature and low-pressure refrigerant into the evaporator to complete the refrigerant circulation process.

Basic composition of refrigeration system

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

Condenser: In the cooling process, the condenser plays the role of outputting heat energy and allowing the refrigerant to condense. After the high-pressure superheated vapor discharged from the refrigeration compressor enters the condenser, all the heat it absorbs during operation, including the heat absorbed from the evaporator and refrigeration compressor and the pipeline, is transferred to the surrounding medium (water or Air) takes away; refrigerant high-pressure superheated vapor re-condenses into a liquid.

Dry filter: It is necessary to prevent the entry of moisture and dirt in the refrigeration cycle. The source of moisture is mainly the trace moisture contained in the newly added refrigerant and lubricating oil, or the moisture caused by the air entering during the maintenance of the system. If the water in the system is not removed, when the refrigerant passes through the throttle valve (thermal expansion valve or capillary tube), the water may freeze into ice due to the drop in pressure and temperature, blocking the channel and affecting the normal operation of the refrigeration device. Therefore, a drying filter must be installed in the refrigeration system.

Throttle valve: The thermal expansion valve (or capillary) is installed between the drying filter and the evaporator in the refrigeration equipment. The thermal expansion valve's temperature package is wrapped at the outlet of the evaporator. Its main function is to make the high-pressure and normal-temperature refrigerant liquid throttle and depressurize when it flows through the thermal expansion valve, and become low-temperature and low-pressure refrigerant wet vapor (mostly liquid, small part of steam) enter the evaporator and vaporize in the evaporator It absorbs heat and achieves the purpose of cooling and cooling.

Evaporator: The evaporator is a heat exchange device that relies on the evaporation of refrigerant liquid (actually boiling) to absorb the heat of the cooled medium. Its function in the refrigeration system is to absorb heat. In order to ensure that the evaporation process can be carried out stably and lastingly, the refrigerant gas must be continuously pumped away 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 refrigerant. Refrigerant is the flowing working fluid in the refrigeration system. Its main function is to carry heat and realize heat absorption and heat release when the state changes.

Three electrical 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 thermostat, pressure protection, delay, relay, overload protection, etc. to achieve automatic start and stop according to water temperature, protection and other functions.

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