A hydrogen or helium throttling liquefaction system using direct current flow from the cold and hot ends of the regenerative cryocoolers

A hydrogen or helium throttling liquefaction system using direct current (DC) flow from the cold and hot ends of the regenerative cryocoolers, characterized in that the system comprises a regenerative cryocooler module, a hot-end DC flow module, a cold-end DC flow module, a throttling liquefaction module, and a gas-phase circulation module;

• wherein the modules are interconnected to form a closed loop for the flow of hydrogen or helium working fluid;
• wherein the throttling liquefaction module comprises, connected in sequence through a low-temperature pipeline:
• a buffer chamber (14), the high-pressure channel of the recuperator (15), a throttle valve (16), and a liquid reservoir (17);
• the gas-phase circulation module comprises, connected in sequence through the refluxed pipeline (18), the low-pressure channel of the recuperator (15), the low-pressure channel of the heat exchange component (19), a control valve (20), and a small compression device (21);
• wherein the transfer tube (2) of the compressor in the regenerative cryocooler module has a bypass, which is connected to the hot-end DC flow module, the lower end of the cold-end heat exchanger of the regenerator in the regenerative cryocooler module has an opening, which is connected to the cold-end DC flow module;
• wherein the hot-end DC flow module leads out the high-temperature and high-pressure working fluid in the transfer tube (2), which is then cooled down by exchanging heat with the working fluid in the refluxed pipeline (18) inside the heat transfer component (19), and finally introduced into the buffer chamber (14), the cold-end DC flow module leads out the low-temperature and high-pressure working fluid from the cold-end heat exchanger (5) and introduces it into the buffer chamber (14);
• wherein the high-pressure and low-temperature working fluid mixed in the buffer chamber (14) is first passed through the recuperator (15) for heat exchange, then is throttled and liquefied through the throttle valve (16) before entering the liquid reservoir (17);
• the gaseous working fluid in the liquid reservoir (17) is separated and recycled through the refluxed pipeline (18), after passing through the recuperator (15), the heat transfer component (19), the control valve (20), and the small compression device (21), its cooling capacity is recovered and it is recompressed;
• finally, it returned to the low-pressure side of the compressor (1) in the regenerative cryocooler module to complete the cycle.