A cabin-piercing adiabatic compression mechanism applied to an ultra-high vacuum cryogenic refrigeration system

Abstract

The invention discloses a cabin-piercing adiabatic compression mechanism applied to an ultra-high vacuum low-temperature refrigeration system, which includes an operating handwheel, a screw, a knife-edge flange, a bellows, a spring, and a heat-insulating column; the front of the screw is equipped with an operating handwheel, The middle part is installed in the threaded hole in the center of the knife-edge flange through threaded connection, the rear part is sleeved with a bellows, and the rear end of the screw is connected to the rear joint II of the bellows; the front end of the bellows is fixed on the knife-edge flange, and the rear end is provided with a spring. A thermal insulation column movable along the axial direction is arranged at the rear end of the spring; turning the operating hand wheel drives the screw to move back and forth, and the bellows is compressed or extended. The present invention enables the operator to change the length of the screw extending into the vacuum chamber by rotating the handwheel to obtain different pressures for the heat insulation components, and to realize the compression of the low-temperature devices moving in the ultra-high vacuum chamber without causing excessive pressure in the chamber. The high-vacuum environment is destroyed; ceramic materials with low thermal conductivity are selected to make heat-insulating columns to achieve a certain heat-insulating effect.

Description

technical field [0001] The invention belongs to the technical field of ultra-high vacuum application, and relates to a cabin adiabatic pressing mechanism applied to an ultra-high vacuum low-temperature refrigeration system. Background technique [0002] In the ultra-high vacuum cryogenic refrigeration system, it is often necessary to press and fix low-temperature devices of different shapes and sizes, and it is usually necessary to apply a certain pressure to the devices through the penetration compression mechanism. However, the conventional vacuum penetration structure often has three aspects. Problems: First, the extra leak rate, material vacuum outgassing and other factors brought about by the piercing structure cause the system vacuum to be destroyed to a certain extent, which affects the maintenance of the ultra-high vacuum environment; The heat source is conducted to the low-temperature device, making it difficult for the device temperature to maintain the target low ...

AI Technical Summary

Problems solved by technology

[0002] In the ultra-high vacuum low-temperature refrigeration system, it is often necessary to compress and fix cryogenic devices of different shapes and sizes. Usually, a certain pressure must be given to the devices through the cabin compression mechanism, but the conventional vacuum cabin structure often has three aspects. Problems: First, factors such as additional leakage rate and material vacuum degassing caused by the penetration structure will damage the vacuum degree of the system to a certain extent, which will affect the maintenance of the ultra-high vacuum environment; The heat source is transmitted to the low-temperature device, which makes it difficult to maintain the target low temperature of the device; the third is that the penetrating mechanism will not be in close contact with the low-temperature device due to thermal expansion and contraction and vibration

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