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US 11,333,409 B2Granted
Cryocooler, cryocooler diagnosis device, and cryocooler diagnosis method
AssigneeSumitomo Heavy Industries, Ltd.
InventorsYoji Mizuno, Kohei Shinohara
Life of this patent
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Abstract
There is provided a cryocooler including a cryocooler cylinder, a pressure switching valve that generates a periodic pressure fluctuation inside the cryocooler cylinder, and a sensor that measures a periodic deformation of the cryocooler cylinder, which is caused by the periodic pressure fluctuation inside the cryocooler cylinder.
Claims9
A cryocooler comprising:
- a cryocooler cylinder;
- a pressure switching valve that generates a periodic pressure fluctuation inside the cryocooler cylinder;
- a sensor that measures a periodic deformation of the cryocooler cylinder caused by the periodic pressure fluctuation inside the cryocooler cylinder, or measures the periodic pressure fluctuation inside the cryocooler cylinder;
- and
- a processor communicably connected to the sensor and configured to:
- receive measured waveform data indicating the periodic deformation or the periodic pressure fluctuation from the sensor, and to
- determine whether or not the cryocooler is degraded based on the measured waveform data, and
- wherein the processor is further configured to:
- calculate a reduced amount of a peak value of the measured waveform data from a preset reference peak value,
- compare the reduced amount of the peak value with a reduced amount threshold value, and
- determine that the cryocooler is degraded if the reduced amount of the peak value is greater than the reduced amount threshold value.
8 more elements
A cryocooler diagnosis device comprising:
- a sensor that measures a periodic deformation of a cryocooler cylinder of a cryocooler, wherein the periodic deformation is caused by a periodic pressure fluctuation inside the cryocooler cylinder, or measures a periodic pressure fluctuation inside a cryocooler cylinder of a cryocooler;
- and
- a processor communicably connected to the sensor and configured to:
- receive measured waveform data indicating the periodic deformation or the periodic pressure fluctuation from the sensor, and to
- determine whether or not the cryocooler is degraded based on the measured waveform data,
- wherein the processor is further configured to calculate a reduced amount of a peak value of the measured waveform data from a preset reference peak value, compare the reduced amount of the peak value with a reduced amount threshold value, and determine that the cryocooler is degraded if the reduced amount of the peak value is greater than the reduced amount threshold value.
3 more elements
A cryocooler diagnosis method comprising:
- measuring a periodic deformation of a cryocooler cylinder of a cryocooler, wherein the periodic deformation is caused by a periodic pressure fluctuation inside the cryocooler cylinder, or measuring a periodic pressure fluctuation inside a cryocooler cylinder of a cryocooler,
- acquiring measured waveform data indicating the periodic deformation or the periodic pressure fluctuation;
- and
- determining whether or not the cryocooler is degraded based on the measured waveform data,
- wherein the determining comprises calculating a reduced amount of a peak value of the measured waveform data from a preset reference peak value, comparing the reduced amount of the peak value with a reduced amount threshold value, and determining that the cryocooler is degraded if the reduced amount of the peak value is greater than the reduced amount threshold value.
2 more elements
Dependencies are inferred from the claim text.