MAIPT Machinery uses GM principle to manufacture some refrigeration equipment,

MAIPT Machinery uses GM principle to manufacture some refrigeration equipment, such as: manufacturing high and low temperature integrated machine, cold and hot integrated machine, screw refrigeration unit and industrial cold water crew and other equipment, the specific principle of GM refrigerator is explained as follows:      

The GM refrigerator is the Gifford-McMahon refrigerator (Gifford-McMahon refrigerator), which is based on the principle of adiabatic gas deflating refrigeration. Taking the ideal single-stage GM refrigerator as an example, its specific working principle is as follows:

Equal volume charging process: the intake valve is opened, the exhaust valve is closed, the high pressure gas from the compressor enters the hot chamber volume above the push piston and the regenerator, and the system pressure rises, so that the pressure of the regenerator and the hot chamber is balanced with the pressure of the high pressure gas storage tank.

Isobaric charging process: the intake valve remains open, the pushing piston moves up from the bottom of the cylinder, and the gas in the hot chamber is pushed out by the regenerator, and the gas is cooled in the regenerator and enters the cold chamber. At the same time, a part of the gas from the high-pressure gas storage tank is also cooled by the regenerator into the cold chamber, and the system pressure remains unchanged during this process.

Equal volume venting process (adiabatic process) : After the piston is moved to the top of the cylinder, the intake valve is closed, the exhaust valve is opened, and the high-pressure gas in the cold chamber is vented to the low-pressure gas storage tank. Due to the faster venting speed, the gas can be approximately regarded as an adiabatic process, and the gas is cooled in this process.

Isobaric degassing process: push the piston down, the remaining low temperature gas in the cold chamber is discharged by the heat exchanger, and the low temperature gas absorbs heat from the surrounding environment when discharged to achieve the refrigeration effect. Subsequently, the gas is reheated by the regenerator and enters the low-pressure gas storage tank to prepare for the next cycle, and the system pressure is maintained at low pressure during this process.

Through the continuous circulation of the above four processes, the GM refrigerator can continuously output cold volume from the heat exchanger of the cold chamber to achieve the purpose of refrigeration.