Super-low-vibration helium cold accumulation system and control method thereof

Abstract

The invention relates to the technical field of low temperature, in particular to a super-low-vibration helium cold accumulation system. The system comprises a helium cavity, a refrigerator and a compressor connected with the refrigerator. The helium cavity is hollow, a chamber for containing helium is formed, one end of the helium cavity is connected with a cold end of the refrigerator, and the other end of the helium cavity is connected with a sample mounting seat. A sample to be tested is fixedly mounted on the sample mounting seat. Meanwhile, the invention discloses a control method of the system. The helium cavity is formed, after the refrigerator is shut down, the low-temperature helium in the helium cavity is used for providing cold capacity for the sample without influencing the temperature state of the cooled sample, a main vibration source disappears, vibration is greatly reduced, and the stability of the position of the cooled sample meets test requirements. Meanwhile, the common refrigerator is adopted in the system, and it is unnecessary to adopt a low-vibration refrigerator or a flexible heat transfer structure, so that cost is greatly reduced.

Description

technical field

[0001] The invention relates to the field of low temperature technology, in particular to an extremely low-vibration helium cold storage system and a control method thereof. Background technique

[0002] With the continuous development of science and technology, scientific research under extreme conditions (such as ultra-low temperature and extremely low vibration conditions) has attracted more and more attention from researchers. At present, there are mature 4KG-M refrigerators and pulse tube refrigerators on the market, which make it easier to cool the sample to 4.2K than using liquid helium. However, whether it is a G-M refrigerator or a pulse tube refrigerator, its own vibration All inevitably affect the position of the cooling sample. These vibrations generally come from four aspects: (1) vibration caused by the operation of the cold head motor of the refrigerator; (2) vibration caused by the reciprocating motion of the cold head cylinder of the refriger...

Examples

Embodiment 1

[0031] In Embodiment 1, preferably, the gas filling pipe 61 connected to the high-purity helium cylinder 66 passes through the pressure reducing valve 65, the flow meter 64, the pressure transmitter 63, and the safety valve 62, and then passes through the first connecting flange 23 to a On the heat exchanger of the stage cold head 21; the control unit 50 collects the information output by the flow meter 64 and the pressure transmitter 63 and controls the action of the safety valve 62 after processing. After the control unit 50 collects the information of the flow meter 64, it can conveniently collect the flow, and can activate the safety valve 62 when the flow is abnormal, so as to protect the system.

[0032] The present invention also provides a control method for an extremely low-vibration helium cold storage system, comprising the following steps: (A) placing the sample 42 to be tested on the sample mount 41; The helium in the chamber 10 is cooled until the temperature is ...

technical field

[0001] The invention relates to the field of low temperature technology, in particular to an extremely low-vibration helium cold storage system and a control method thereof. Background technique

[0002] With the continuous development of science and technology, scientific research under extreme conditions (such as ultra-low temperature and extremely low vibration conditions) has attracted more and more attention from researchers. At present, there are mature 4KG-M refrigerators and pulse tube refrigerators on the market, which make it easier to cool the sample to 4.2K than using liquid helium. However, whether it is a G-M refrigerator or a pulse tube refrigerator, its own vibration All inevitably affect the position of the cooling sample. These vibrations generally come from four aspects: (1) vibration caused by the operation of the cold head motor of the refrigerator; (2) vibration caused by the reciprocating motion of the cold head cylinder of the refriger...

Examples

Embodiment 1

[0031] In Embodiment 1, preferably, the gas filling pipe 61 connected to the high-purity helium cylinder 66 passes through the pressure reducing valve 65, the flow meter 64, the pressure transmitter 63, and the safety valve 62, and then passes through the first connecting flange 23 to a On the heat exchanger of the stage cold head 21; the control unit 50 collects the information output by the flow meter 64 and the pressure transmitter 63 and controls the action of the safety valve 62 after processing. After the control unit 50 collects the information of the flow meter 64, it can conveniently collect the flow, and can activate the safety valve 62 when the flow is abnormal, so as to protect the system.

[0032] The present invention also provides a control method for an extremely low-vibration helium cold storage system, comprising the following steps: (A) placing the sample 42 to be tested on the sample mount 41; The helium in the chamber 10 is cooled until the temperature is ...

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