Back-condensing refrigerating system

Abstract

The invention discloses a back-condensing refrigerating system, and relates to the technical field of high-purity germanium spectrometers. The back-condensing refrigerating system comprises a tank body, a refrigerating assembly and a damping sealing assembly. The tank body comprises an inner container and an outer shell wrapping the inner container, liquid nitrogen is stored in the inner container, and a vacuum layer is arranged between the inner container and the outer shell. The refrigerating assembly comprises a mounting bottom plate and a refrigerating machine, the mounting bottom plate is fixedly connected with the outer shell and the refrigerating machine, and the refrigerating machine is inserted into the inner container. The damping sealing assembly comprises a first sealing gasket and a corrugated pipe, the first sealing gasket is arranged on the periphery of the refrigerating machine in a sleeving mode, the first sealing gasket is arranged between the mounting bottom plate and the tank body, the corrugated pipe is arranged on the periphery of the refrigerating machine in a sleeving mode, and the two ends of the corrugated pipe are fixed to the refrigerating machine and the mounting bottom plate correspondingly. According to the back-condensing refrigerating system, the temperature can be isolated, liquid nitrogen reduction caused by temperature conduction is reduced to a certain extent, and the sealing performance and stability of the whole back-condensing refrigerating system are improved.

Description

technical field [0001] The invention relates to the technical field of high-purity germanium spectrometers, in particular to a retrocondensation refrigeration system. Background technique [0002] The high-purity germanium spectrometer is an analytical instrument used in the field of earth science. The probe of the high-purity germanium spectrometer can measure the activity of radioisotope rays in marine samples (seawater, sediments, organisms). When in use, the probe needs to be refrigerated by a recondensation refrigeration system. Liquid nitrogen is installed in the recondensation refrigeration system, and the probe is inserted into the recondensation refrigeration system to contact with liquid nitrogen to achieve refrigeration. [0003] The existing condensing refrigeration system needs to meet the requirement of not adding liquid nitrogen for a long time, and adding liquid at one time can meet the use of more than one year. Therefore, it is necessary to use a refrigerat...

AI Technical Summary

Problems solved by technology

However, liquid nitrogen is extremely difficult to store. The tank storing liquid nitrogen can insulate the temperature through the vacuum layer between the inner tank and the outer shell to reduce the decrease of liquid nitrogen caused by temperature conduction to a certain extent. However, if the seal of the tank is not tight, the liquid After nitrogen turns into nitrogen gas, the internal pressure of the tank increases, and nitrogen gas easily leaks from the seal, causing liquid nitrogen to decrease

At the same time, due to the work of the refrigerator, there will be a certain vibration on the tank body, and the vibration will lead to the detection accuracy of the probe inserted into the tank body, which will have a negative impact on the work of the probe.

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