Refrigerator and cold trap
First Claim
1. A cold trap including a refrigerator, a trap vessel arranged between the refrigerator and a vacuum vessel, and a cold panel arranged in the trap vessel and cooled by the refrigerator to trap gas molecules, the cold trap comprising a vibration sensor configured to detect a vibration in the cold trap,the refrigerator comprising:
- a case;
a piston capable of reciprocally moving in the case so as to compress and expand a working medium;
a dynamic vibration absorber attached outside the case and configured to reduce the vibration when the piston is driven; and
a driving frequency adjustment unit configured to adjust a driving frequency of the piston to increase a vibration reduction effect of the dynamic vibration absorber based on a signal from the vibration sensor,wherein the driving frequency adjustment unit comprises;
a bandpass filter configured to process the signal from the vibration sensor;
an arithmetic processor configured to output a control signal to reduce the vibration based on the signal processed by the bandpass filter; and
a driving unit configured to drive the piston at the driving frequency corresponding to the control signal from the arithmetic processor.
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Accused Products
Abstract
This invention provides a cold trap using a Stirling refrigerator. A refrigerator includes a drive piston configured to drive a free piston so as to reciprocally move a working medium between a heat dissipation portion and a heat absorption portion, a vibration sensor configured to measure a vibration of a case, a dynamic vibration absorber configured to reduce the vibration of the case when the drive piston is driven, and a frequency adjustment device configured to adjust a driving frequency to reduce the vibration of the case when the drive piston is driven in a state in which the case is connected to a vacuum device.
15 Citations
4 Claims
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1. A cold trap including a refrigerator, a trap vessel arranged between the refrigerator and a vacuum vessel, and a cold panel arranged in the trap vessel and cooled by the refrigerator to trap gas molecules, the cold trap comprising a vibration sensor configured to detect a vibration in the cold trap,
the refrigerator comprising: -
a case; a piston capable of reciprocally moving in the case so as to compress and expand a working medium; a dynamic vibration absorber attached outside the case and configured to reduce the vibration when the piston is driven; and a driving frequency adjustment unit configured to adjust a driving frequency of the piston to increase a vibration reduction effect of the dynamic vibration absorber based on a signal from the vibration sensor, wherein the driving frequency adjustment unit comprises; a bandpass filter configured to process the signal from the vibration sensor; an arithmetic processor configured to output a control signal to reduce the vibration based on the signal processed by the bandpass filter; and a driving unit configured to drive the piston at the driving frequency corresponding to the control signal from the arithmetic processor. - View Dependent Claims (2, 3, 4)
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Specification