人工衛星搭載用単段スターリング冷凍機の性能向上と効率改善検討

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  • Improvement of cooling capacity and efficiency of single stage Stirling cryocooler for space use.

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<p>Since 1987 Sumitomo Heavy Industries, Ltd. (SHI) has been developing Stirling cryocooler (STC) and Joule Thomson cryocoolers for onboard satellites which have a limited power capacity and space. Thus, the cryocooler for this purpose is required to have a low power consumption (high efficiency), a compact size and a light weight. Also, high reliability is required since the cryocooler must continuously operate in space for more than 10 years without trouble. A single stage STC has been developed by SHI that have been installed for the observation sensors and heat shield cooling such as the Earth Observation Satellite “Sikisai”, the Scientific Satellite “Suzaku”, “Kaguya”, “Akatsuki”, “Hitomi” [1], has a weight of 4.1 to 4.5 Kg and a cooling capacity of 2.2 W at 77 K with a maximum electrical input power of 50 W. However, when it is necessary to increase the cooling capacity due to the increase in the heat generation amount of the device, this cryocooler cannot be dealt with adequately. In this report, by improving the motor efficiency of the compressor, the maximum electrical input power was doubled (about 100 W) without greatly changing the size of the compressor, and the cooling performance was increased thus the efficiency was improved. In addition, a pulse tube expander was manufactured with the aim of reducing vibrations to the object to be cooled, connected to a high-efficiency compressor, and the cooling performance was measured.</p>

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