CN-122015416-A - Vibration reduction and heat insulation type low-temperature control system

CN122015416ACN 122015416 ACN122015416 ACN 122015416ACN-122015416-A

Abstract

The application discloses a vibration reduction and heat insulation type low-temperature control temperature system, which relates to the technical field of low-temperature control temperature tests, wherein a refrigerating unit comprises a lower cavity wall and a cold head, the lower installation part of the lower cavity wall through which the refrigerating unit passes is connected with an external structure, a first-stage cold head of the cold head is provided with a cold head flange, the lower cavity wall and the cold head flange are connected through a first flexible corrugated pipe and jointly define a lower cavity heat insulation space surrounding the first-stage cold head and a second-stage cold head, a first heat exchanger connected with the second-stage cold head is arranged in the lower cavity heat insulation space, a gaseous refrigerant enters the lower cavity heat insulation space through an input pipeline, the gaseous refrigerant in the lower cavity heat insulation space exchanges heat with the second-stage cold head through the first heat exchanger and is converted into a liquid refrigerant, and the liquid refrigerant flows through a load and exchanges heat with the load and then enters an output pipeline. The system can effectively isolate high-frequency vibration impact energy generated by the cold head in the running process, and protects a plurality of heat insulation components, loads and samples to be tested on the periphery of the cold head.

Inventors

CAI XUDONG
SONG JIANTANG
SHI XINMIN
CAO ZHIQIANG
FU DAPENG
HUANG JIXIN
ZHANG XUEYING

Assignees

致真精密仪器(杭州)有限公司

Dates

Publication Date: 20260512
Application Date: 20260120

Claims (10)

1. A vibration damping and insulating low temperature control system, comprising: A load; an input pipeline; An output line; the refrigerating unit comprises a lower cavity wall and a cold head, wherein the lower cavity wall is provided with a lower installation part, the refrigerating unit is connected to an external structure through the lower installation part, the cold head comprises a first-stage cold head and a second-stage cold head, the first-stage cold head is provided with a cold head flange, the lower cavity wall and the cold head flange are connected through a first flexible corrugated pipe and jointly define a lower cavity heat insulation space surrounding the first-stage cold head and the second-stage cold head, a first heat exchanger connected with the second-stage cold head is arranged in the lower cavity heat insulation space, and a gaseous refrigerant enters the lower cavity heat insulation space through an input pipeline so as to isolate vibration generated by the cold head on the lower installation part by utilizing flexible deformation of the first flexible corrugated pipe; The gaseous refrigerant in the lower cavity heat insulation space exchanges heat with the second-stage cold head through the first heat exchanger and is converted into liquid refrigerant, and the liquid refrigerant flows through the load and exchanges heat with the load and then enters the output pipeline.
2. The vibration-damping and heat-insulating type low-temperature control system according to claim 1, further comprising a bracket connected to the upper side of the cold head through at least one of a damper, an elastic member, and an upper elastic buffer structure, or rigidly connected to the upper side of the cold head.
3. The vibration-damping and heat-insulating low-temperature control system according to claim 2, wherein the upper elastic buffer structure comprises a suspension mounting part and a lower connecting part positioned below the suspension mounting part, the suspension mounting part and the lower connecting part are connected through an elastic body, the primary cold head is fixedly connected with the lower connecting part, and the suspension mounting part is connected with the bracket.
4. The vibration reduction and insulation type low temperature control system according to claim 3, wherein the elastic body is a second flexible corrugated pipe, the suspension installation part, the second flexible corrugated pipe and the lower connection part together define an upper cavity buffer space, and a positive pressure environment is formed in the upper cavity buffer space through a gaseous refrigerant, so that vibration impact energy generated by the cold head on the suspension installation part is isolated by using compressibility of the gaseous refrigerant and flexible deformation of the second flexible corrugated pipe.
5. The vibration-damping and heat-insulating type low-temperature control system according to claim 4, wherein the lower chamber heat-insulating space and the upper chamber buffer space are communicated through an air flow passage to achieve pressure balance.
6. The vibration reduction and heat insulation type low-temperature control system according to claim 1, wherein a second heat exchanger is arranged between the lower cavity wall and the primary cold head, and the second heat exchanger is a non-contact heat exchanger.
7. The vibration reduction and heat insulation type low temperature control system according to claim 1, wherein the load comprises a third heat exchanger, a first cold screen and a refrigerant pipeline which is communicated with the third heat exchanger and the first cold screen, the first cold screen is used for supporting the third heat exchanger at intervals through a first heat insulation structure, the third heat exchanger is communicated with the first heat exchanger, the first cold screen is communicated with the output pipeline, so that liquid refrigerant discharged through the first heat exchanger firstly passes through the third heat exchanger to release cold energy, then enters the first cold screen through the refrigerant pipeline to release cold energy, and finally is output through the output pipeline.
8. The vibration-damping and heat-insulating low-temperature control system according to claim 7, further comprising a sealing wall and a second cold screen, wherein the sealing wall is connected and matched with the lower mounting part to form a temperature control cavity capable of vacuumizing, the temperature control cavity surrounds the load and the lower cavity wall, the second cold screen is arranged in the temperature control cavity, the second cold screen is connected and matched with the lower cavity wall and is arranged around the load, the inner wall of the second cold screen supports the first cold screen at intervals through a second heat-insulating structure, and the inner wall of the temperature control cavity supports the second cold screen at intervals through a third heat-insulating structure.
9. The vibration-damping and heat-insulating low-temperature control system according to claim 7, wherein a non-contact heat exchanger is arranged between the secondary cold head and the lower cavity wall.
10. The vibration-damping and heat-insulating type low-temperature control system according to any one of claims 1 to 9, wherein the input pipe is connected to the output pipe through a circulation pump capable of re-pumping the refrigerant flowing through the load into the input pipe; The vibration reduction and heat insulation type low-temperature control system further comprises an air storage tank, wherein the air storage tank can supplement the refrigerant to the input pipeline or reflux the refrigerant output by the output pipeline.

Description

Vibration reduction and heat insulation type low-temperature control system Technical Field The application relates to the technical field of low-temperature control testing, in particular to a vibration reduction and heat insulation type low-temperature control system. Background In the technical fields of scientific research, material testing, semiconductor technology, superconducting materials and the like, it is important to accurately measure the physical properties (such as electricity, magnetism and optical characteristics) of a sample in a low-temperature (such as liquid helium temperature zone 4K) and variable-temperature environment. Such tests typically employ a fixedly mounted coldhead to provide coldness to a load upon which a sample is placed. However, there are a number of disadvantages to existing low temperature control systems of this type. On the one hand, during the refrigeration process, the cold head can generate vibration impact (such as the movement of a compressor piston and the expansion and contraction movement of the cold head), and because the cold head is generally rigidly connected to an external structure or related supporting components, the vibration impact energy can be directly transmitted to the installation structure of the whole system and the surrounding environment, which not only can influence the stability and the service life of the system, but also can interfere the load or the tested sample which is sensitive to vibration, thereby causing the deviation of the detection result. For example, in some situations where detection is performed by using a high-precision optical path, vibration exceeding a defined threshold may change the optical path or displace a sample, which affects the accuracy of detection, and for example, in a system where load refrigeration is implemented by using a refrigerant through heat exchange of a cold head, high-frequency vibration impact easily causes loosening of a connection part of a refrigerant pipeline, increases the risk of leakage of the refrigerant, and simultaneously causes turbulence and pulse of the refrigerant in the pipeline, which affects the conveying stability and heat exchange efficiency of the refrigerant. Therefore, there is room for improvement in vibration reduction and the like of the conventional low temperature control system, and there is an urgent need for a low temperature control system capable of effectively solving the above-mentioned problems. Disclosure of Invention The invention aims to provide a vibration reduction and heat insulation type low-temperature control system, which overcomes the defects of the existing low-temperature control system in vibration reduction and the like, reduces the influence of vibration on the system and a tested sample, and improves the reliability and applicability of the whole system. The technical scheme adopted by the application is as follows: The utility model provides a damping heat-insulating type low temperature control temperature system, includes load, input pipeline, output pipeline and refrigerating unit, refrigerating unit includes cavity wall and cold head down, cavity wall is equipped with down the installation department, refrigerating unit passes through down the installation department is connected in outer structure, the cold head includes one-level cold head and second grade cold head, one-level cold head is equipped with the cold head flange, cavity wall down with the cold head flange passes through first flexible bellows and jointly defines the lower chamber thermal insulation space who surrounds one-level cold head and second grade cold head, be equipped with in the lower chamber thermal insulation space and connect the first heat exchanger of second grade cold head, gaseous refrigerant gets into through the input pipeline the cavity thermal insulation space to utilize the flexible deformation of first flexible bellows is isolated the cold head is to the vibration that lower installation department produced, gaseous refrigerant in the cavity thermal insulation space is through first heat exchanger with second grade cold head heat transfer and change into liquid refrigerant, liquid refrigerant flows through the load and with the load gets into after the heat transfer. In this technical scheme, novel damping function has been given to the gaseous refrigerant that is only used for heat transfer refrigeration traditionally, has realized a thing dual-purpose, connect the cold head flange of lower chamber wall and one-level cold head through first flexible bellows and form the heat-proof space of lower chamber, first flexible bellows keeps apart cold head and lower chamber wall, first flexible bellows constitutes the intermediate part of cold head down chamber wall transmission vibration, thereby the vibration is transmitted to the lower chamber wall to isolated cold head, show the vibration that reduces and transmit external structure and environment, the