Aisin Seiki Kabushiki Kaisha

Central Japan Railway Company

Mitsubishi Denki Kabushiki Kaisha

Railway Technical Research Institute

Hideo Mita

Hideo Misawa

Yoshihira Shiroshita

Kiyoshi Ishibashi

Takayuki Furusawa

Akiyoshi Hirano

Katsunobu Kanda

Motohiro Igarasi

Ken Nagashima

Yoshihiro Jizo

Toshiyuki Amano

Tetsuya Gotou

Toshiki Herai

Yujiro Ukai

Tetuya Gotou

Naoto Kurita

A cooling apparatus comprises a pulse tube refrigerator (A) having a pressure source (), a cold reservoir (), a condenser (), a pulse tube (), a radiator (), and a phase adjuster (); and a low-temperature container having a liquid reservoir () fixed to a vacuum tank () through heat-insulating support members () and (). The condenser () is fixed to a cold end () of the cold reservoir (), and is disposed in a gas phase portion () of the liquid reservoir (). A hot end of the pulse tube () is fixed to the vacuum tank () and is disposed in such a manner that a cold end () of the pulse tube () is located lower than the hot end and is located in a liquid phase portion () of the liquid reservoir (). The cold end () of the pulse tube () is disposed outside the liquid reservoir () but within the vacuum tank (), and the cold end () of the pulse tube () and the condenser () communicate with each other through piping ().

Cooling device

A pulse tube refrigerating machine, comprising a pulse tube () connected to a regenerator () and having a hot end part () being heated, in which a cooling device (), for cooling the hot side tube wall () of the pulse tube by cooling medium lower in temperature than the hot side tube wall of the pulse tube, cools the hot side tube wall () of the pulse tube by coolant flowing from the pressure source () of the pulse tube refrigerating machine into the regenerator ().

Pulse tube refrigerating machine

A cooling system includes a cold-accumulating refrigerator, and a cooling circuit. The cold-accumulating refrigerator includes a cold accumulator. The cooling circuit includes a heat exchanger. The heat exchanger is thermally brought into contact with a portion of the cold accumulator whose temperature is varied from a high temperature to a low temperature by a working medium flowing therein. Thus, it is possible to utilize cold produced by the working medium flowing in the cold accumulator in one cycle (e.g., from a high temperature to a low temperature, and from a low temperature to a high temperature), thereby remarkably enhancing the cooling system in terms of cooling efficiency.

Cooling system

A cooling system includes a cold-accumulating refrigerator, and a cooling circuit. The cold-accumulating refrigerator includes a regenerator. The cooling circuit includes a main circuit, and a branched circuit. The main circuit includes a counterflow heat exchanger. The branched circuit is branched from an upstream portion of the main circuit, and joined to a downstream portion thereof, thereby reducing one of the flows of a refrigerant, flowing in a high-pressure-side passage and a low-pressure-side passage which are disposed in the counterflow heat exchanger, with respect to the other one of the flows. Moreover, the branched circuit includes a heat exchanger, and the heat exchanger is thermally brought into contact with a portion of the regenerator whose temperature is varied from a high temperature to a low temperature by another refrigerant flowing therein. Thus, the cooling efficiency of the cooling system is remarkably improved synergetically by the cooling resulting from the flow-difference in the counterflow heat exchanger, and by the extra cooling stemming from the thermal-contact at the regenerator.

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.

Refrigeration system

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.

A refrigerator includes a working space which is in fluid communication with a vessel of the volume-variable type with a capillary acting as a flow resistance. Each time change of the average cycle pressure in the working space is occurs, the volume of the vessel is varied so as to cancel the pressure-change. Thus, the average cycle pressure in the working space may be kept at a set value.

Refrigerator

A refrigerating system of this invention includes at least one expansion chamber, at least one cryogenic accumulator, conduits connecting the expansion chamber and the cryogenic accumulator, and a substance to be cooled disposed between the expansion chamber and the cryogenic accumulator and in contact with one of conduits. It is a feature of this invention that a bypass conduit is disposed in parallel with one of the conduits in contact with the substance to be cooled. Thus, even when the substance to be cooled is placed away from one of the expansion chambers and one of the cryogenic accumulators, the refrigerating system of this invention can efficiently produce an extremely cold temperature of 40.degree. K. or less, and cool the substance to be cooled to a much lower temperature.

Refrigerating system

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.

Growing community of inventors

Okazaki, Japan

Hideo Mita