# US 5,345,770 A · Low-temperature regenerative type refrigerator

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- Number: US 5,345,770 A
- Document ID: US5345770A
- Status: Granted
- Kind: A
- Application number: 08/006,483
- Filed: 1993-01-21
- Granted: 1994-09-13
- Earliest claimed: 1992-01-29
- Assignees: Mitsubishi Denki Kabushiki Kaisha
- Inventors: Takashi Inaguchi
- Web page: https://patentgrep.com/patent/US5345770A

## CPC

- F25B 9/14: characterised by the cycle used, e.g. Stirling cycle
- F25B 2309/003: characterised by construction or composition of the regenerator
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS

## Abstract

Disclosed is a low-temperature regenerative type refrigerator installed in a low temperature environment, in which a cooling water flow rate controller for adjusting the flow rate of cooling water automatically in accordance with the temperature of gas fed to an expansion unit from a compressor, is provided in a water cooling type cooler for cooling the compressor, to keep the temperature of the gas discharged from the compressor high to the extent of not deteriorating the function of a seal due to shrinkage or not causing convection or deflecting flow in a regenerator, whereby it is made possible to prevent the deterioration in the cooling efficiency of the regenerator which is caused by a lowering of the ambient temperature in the refrigerator installed place, and hence possible to prevent the deterioration of the refrigerating capacity as the entire refrigerator.

## Claims

### Claim 1

A low-temperature regenerative type refrigerator comprising:
an expansion unit having a cylinder, a displacer for forming an expansion space within said cylinder, said displacer being disposed within the cylinder so as to be slidable reciprocatively through a seal, and a regenerator for heat exchange of gas which is fed into and discharged from said expansion space;
a compressor for compressing the gas discharged from said expansion unit and feeding the compressed gas to the expansion unit;
a heater for heating the gas fed to said expansion unit from said compressor; and
a heater controller for controlling the quantity of heat of said heater in accordance with the temperature of the gas fed to said expansion unit from said compressor.