CRYOGENIC REFRIGERATOR AND CONTROL METHOD THEREFOR
First Claim
1. A cryogenic refrigerator which generates a cryogenic temperature by compressing a working gas in a closed loop and expanding the compressed working gas, the cryogenic refrigerator comprising:
- a bypass line which allows a high-pressure portion and a low-pressure portion in the closed loop to communicate with each other;
a gas storage tank which is located midway in the bypass line and has pressure regulation valves on the high-pressure side and the low-pressure side, respectively; and
a pressure control unit which controls the pressure regulation valves,wherein the pressure control unit controls the pressure regulation valves so that the pressure in the gas storage tank is equal to the pressure in the closed loop at room temperature and in a stopped state and controls the pressure regulation valves so that the pressure in the high-pressure portion is equal to a predetermined pressure in an operating state in which a cryogenic temperature is generated.
1 Assignment
0 Petitions
Accused Products
Abstract
A cryogenic refrigerator (10) which generates a cryogenic temperature by compressing and expanding a working gas in a closed loop (11). The cryogenic refrigerator comprises a bypass line (22) allowing a high-pressure portion and a low-pressure portion to communicate with each other, a gas storage tank (24) located midway in the bypass line and having pressure regulation valves (23a, 23b) on the high-pressure side and the low-pressure side, respectively, and a pressure control unit (26) controlling the pressure regulation valves. The pressure control unit (26) controls the pressure regulation valves (23a, 23b) so that the pressure in the gas storage tank (24) is equal to the pressure in the closed loop at room temperature and in a stopped state and so that the pressure in the gas storage tank (24) is between the pressures in the high-pressure portion and in the low-pressure portion and is close to the pressure in the low-pressure portion in an operating state.
59 Citations
7 Claims
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1. A cryogenic refrigerator which generates a cryogenic temperature by compressing a working gas in a closed loop and expanding the compressed working gas, the cryogenic refrigerator comprising:
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a bypass line which allows a high-pressure portion and a low-pressure portion in the closed loop to communicate with each other; a gas storage tank which is located midway in the bypass line and has pressure regulation valves on the high-pressure side and the low-pressure side, respectively; and a pressure control unit which controls the pressure regulation valves, wherein the pressure control unit controls the pressure regulation valves so that the pressure in the gas storage tank is equal to the pressure in the closed loop at room temperature and in a stopped state and controls the pressure regulation valves so that the pressure in the high-pressure portion is equal to a predetermined pressure in an operating state in which a cryogenic temperature is generated. - View Dependent Claims (2, 3, 4, 5)
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6. A control method for a cryogenic refrigerator which generates a cryogenic temperature by compressing a working gas in a closed loop and expanding the compressed working gas, the control method comprising:
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providing the cryogenic refrigerator with a bypass line which allows a high-pressure portion and a low-pressure portion in the closed loop to communicate with each other and a gas storage tank which is located midway in the bypass line and has pressure regulation valves on the high-pressure side and the low-pressure side, respectively; and controlling the pressure regulation valves so that the pressure in the gas storage tank is equal to the pressure in the closed loop at room temperature and in a stopped state and controlling the pressure regulation valves so that the pressure in the high-pressure portion is equal to a predetermined pressure in an operating state in which a cryogenic temperature is generated. - View Dependent Claims (7)
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Specification