Abstract: A refrigeration system includes a refrigerator having a compression portion having a compression cylinder and a compression piston moving slidably in the cylinder, a first heat excahnger, a regenerator and a second heat exchanger. An expansion portion has an expansion cylinder and an expansion piston moving slidably in the cylinder. A drive device drives the compression piston via a first rod and the expansion piston via a second rod. The compression cylinder includes a first large diameter portion where the compression piston is slidably moved and a first small diameter portion where the first rod is slidably moved, and the expansion cylinder includes a second large diameter portion where the expansion piston is slidably moved and a second small diameter portion where the second rod is slidably moved.

Abstract: A refrigeration system includes a refrigerator having a compression portion having a cylinder and a piston moving slidably in the cylinder, a first heat exchanger, a regenerator, a second heat exchanger, and an expansion portion having a bellows and a head formed integrally with the bellows. The piston is driven via a first rod and the head via a second rod. The cylinder has a large diameter portion where the piston is slidably moved and a small diameter portion where the rod is slidably moved.

Abstract: Reciprocating type compressor which includes a cylinder having an inner bore, a piston reciprocating in the inner bore, an inter cooler adjacent a compression space which is formed in the inner bore by the piston and an operational gas passage and a refrigerant passage arranged in heat-exchanging relationship. An inlet valve is located adjacent to the compression space for controlling the introduction of operational gas in response to an intake stroke of the piston, and an outlet valve is arranged adjacent to the inter cooler so as to discharge the operational gas via the inter cooler in response to a discharge stroke of the piston. The refrigerant passage is ring-shaped and defines a longitudinal axis coinciding with an axial center of the inner bore. The operational gas passage includes a plurality of conduits for conducting operational gas from the compression space. The conduits include inlet ends disposed opposite the compression space and outlet ends disposed opposite the outlet valve.

Abstract: The invention relates to a heat exchanger, particularly a counter-flow heat exchanger for use in a Joule-Thomson refrigerator. The heat exchanger includes a casing having at least one pipe disposed therein which defines a first flow passage for conducting a first fluid. A second flow passage is provided between the pipe and the casing for conducting a second fluid in heat transfer relationship with the first fluid. A plurality of wire nets are provided along each of the two flow passages to facilitate heat transfer between the two respective fluids.

Abstract: The maximum pressure of a working medium is reduced to or below the critical pressure of the working medium, or the critical pressure of the working medium is selected to lie between the maximum and minimum pressures of the working medium in a refrigerating machine having a compressor, a radiator, a heat exchanger, and an expander which are in successive communication, and the working medium is liquified partly or wholly in the heat exchanger and/or the expander.