Low temperature cooling equipment by taking refrigerator as cold source

Abstract

The invention discloses low temperature cooling equipment by taking a refrigerator as a cold source. The low temperature cooling equipment comprises a hood body provided with a vacuum cavity, a refrigerator and a liquid helium pond, a superfluid helium pond and a sample container arranged in the vacuum cavity. A condenser is arranged on a secondary cold head; the superfluid helium pond is locatedin a position below the liquid helium pond; an accommodating cavity of the liquid helium pond communicates to an accommodating cavity of the superfluid helium pond through a throttling pipeline; the sample container is located in a position below the superfluid helium pond, and the sample container is attached and fixed to the bottom surface of the superfluid helium pond; the equipment also comprises a main air inlet pipeline and a gas circulating pipeline; one end of the main air inlet pipeline is connected to helium supply equipment while the other end of the main air inlet pipeline is connected to the accommodating cavity of the liquid helium pond in a communicating manner; and one end of the gas circulating pipeline communicates to the accommodating cavity of an accommodating cavity ofthe superfluid helium pond while the other end of the gas circulating pipeline is connected to the main air inlet pipeline in a communicating manner. The low temperature cooling equipment disclosed by the invention can acquire 1.8K superfluid helium quickly by means of constant temperature high purity helium, is short in precooling time of a cooled sample and is convenient to cool a device needing an extremely low temperature quickly.

Description

technical field [0001] The invention relates to the technical field of cryogenic cooling. More specifically, it relates to a low-temperature cooling device using a refrigerator as a cold source. Background technique [0002] In high-precision instruments such as photon detectors and infrared detectors, the detection signal is weak after all, and it is very easy to be affected by surrounding interference. With the development of high and new technologies such as aerospace and information technology, the requirements for the accuracy of detectors in the technical field are increasing day by day, and higher requirements are put forward for the elimination of noise interference. The lower the temperature, the less radiation the object emits, so when the detector is in a lower ambient temperature, the surrounding environment will have less interference and the measurement accuracy will be higher. When superconducting magnets are cooled, because superfluid helium has lower visco...

AI Technical Summary

Problems solved by technology

Due to the introduction of the refrigerator, the vibration of the sample is inevitable, which has brought great interference to the operation of the cooled precision instrument

Secondly, the refrigerator cools helium at room temperature to generate 4.2K liquid helium. It is necessary to pre-cool the helium circulation pipeline first, and this process takes a long time.

Finally, in order to eliminate the vibration caused by the refrigerator, the sample and the refrigerator need to be in contact with each other as little as possible, which makes it difficult to cool the sample

Images