Abstract: An expansion valve for a refrigerant circuit of a refrigeration apparatus is configured to depressurize a liquid refrigerant. The expansion valve includes a valve main body with a valve seat opening into a valve chest formed in the valve main body and a valve body movable relative to the valve chest in a reciprocating manner. An orifice is formed in the valve seat. The orifice has an orifice entrance with a smallest diameter, an orifice middle section widening in diameter along a direction of refrigerant outflow from the orifice entrance so as to form a first taper angle, and an orifice exit either widening in diameter or not in diameter along the direction of refrigerant outflow from the orifice middle section so as to form a second taper angle smaller than the first taper angle.

Abstract: Disclosed is a casing structure by which stiffness of a casing of a container refrigeration unit for cooling the interior of a container can be increased without affecting the arrangement, shape, and maintainability of devices accommodated in the casing. A container interior side of the external casing (12) which constitutes the casing (11) is provided with flanges (34) which extend vertically and which are located at both end portions of the external casing (12) along a dimension of the container width. Each of the flanges (34) has a rectangular cylindrical portion (34a) extending vertically along the external casing (12).

Abstract: Disclosed is a casing structure by which stiffness of a casing of a container refrigeration unit for cooling the interior of a container can be increased without affecting the arrangement, shape, and maintainability of devices accommodated in the casing. A container interior side of the external casing (12) which constitutes the casing (11) is provided with flanges (34) which extend vertically and which are located at both end portions of the external casing (12) along a dimension of the container width. Each of the flanges (34) has a rectangular cylindrical portion (34a) extending vertically along the external casing (12).

Abstract: The cryogenic refrigeration system of the present invention includes a JT refrigerator and a pre-cooling refrigerator. The JT refrigerator includes a JT valve, which is fully opened during a clog elimination operation, and a first switching valve, which is provided along a low pressure line of a JT circuit and is closed during the clog elimination operation. The cryogenic refrigeration system includes a PL pipe for collecting a helium gas from a helium tank into a buffer tank. The PL pipe includes a second switching valve and a third switching valve, which are opened during the clog elimination operation.

Abstract: The cryogenic refrigeration system of the present invention includes: a shield plate for preventing a radiant heat from entering a superconducting magnet; a helium refrigerator for generating a liquid helium, the helium refrigerator including a pre-cooling refrigerator for pre-cooling a helium gas; and a nitrogen refrigerator for cooling nitrogen in a nitrogen tank; and a controller, whereby when a vehicle is running, a low pressure side compressor and a high pressure side compressor are operated, and the helium refrigerator and the nitrogen refrigerator are operated, whereas when the vehicle is not running, the operation of the pre-cooling refrigerator of the helium refrigerator is stopped while the operation of the nitrogen refrigerator is continued.