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US 7,121,116 B2Granted
Method and device for producing oxygen
AssigneeFuji Electric Co., Ltd.
InventorsTomoyoshi Kamoshita, Mikihiko Matsuda, Keishi Ohshima
Life of this patent
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Abstract
A oxygen-production device includes a pulse-tube cryocooler for cooling air to liquefy oxygen, and a main container for obtaining and retaining liquefied oxygen. The main container has a heat regenerator, a cold head, and a pulse tube of the pulse-tube cryocooler therein. A temperature sensor measures a temperature of the liquefied oxygen, and a control device controls an output of the pulse-tube cryocooler according to the temperature measured by the temperature sensor.
Claims15
A method for producing oxygen, comprising the steps of:
- cooling air to a temperature less than a liquefaction temperature of oxygen and higher than a liquefaction temperature of argon with a cryocooler to obtain liquefied oxygen,
- measuring a temperature of the liquefied oxygen, and controlling an output of the cryocooler to maintain the temperature at a predetermined value, and
- separating the liquefied oxygen from nitrogen and the argon in gas phases, or from the argon in a gas phase.
A oxygen-production device for producing oxygen, comprising:
- a pulse-tube cryocooler for cooling atmospheric air to liquefy the oxygen, said pulse-tube cryocooler having a heat regenerator, a cold head, and a pulse tube;
- a main container for obtaining and retaining liquefied oxygen having an air inlet, an output port for the liquefied oxygen, and an outlet for residual gases other than the liquefied oxygen, said main container retaining the heat regenerator, the cold head and the pulse tube therein;
- a temperature sensor for measuring a temperature of the liquefied oxygen;
- and
- a control device electrically connected to the temperature sensor for controlling an output of the pulse-tube cryocooler according to the temperature measured by the temperature sensor.
2 more elements
Dependencies are inferred from the claim text.