Reverse knife edge pipe type helium-4 supercurrent suppressor

Abstract

The invention is applicable to the technical field of ultralow-temperature dilution refrigerators, and provides a reverse knife edge pipe type helium-4 supercurrent suppressor. The reverse knife edgepipe type helium-4 supercurrent suppressor comprises a forward knife edge pipe, a reverse knife edge pipe and a reverse knife edge pipe separation plate, wherein the forward knife edge pipe communicates with a distillation chamber; the forward knife edge pipe and the distillation chamber are connected through a forward knife edge pipe separation plate; the distillation chamber communicates with asuction pipeline through a sealing pipeline; and the reverse knife edge pipe separation plate is connected with the reverse knife edge pipe. The reverse knife edge pipe type helium-4 supercurrent suppressor provided by the invention has the advantages that the effect of inhibiting the climbing over flowing of helium-4 superflow liquid is ingeniously achieved; the heat leakage loss is reduced; thedilution refrigerators can work more reliably and stably; the refrigerating capacity is improved; the helium-3 consumption is reduced; the energy loss is reduced; and the economical benefits are obvious.

Description

technical field [0001] The invention belongs to the technical field of ultra-low temperature dilution refrigerators, in particular to a reverse knife-edge tube type helium-4 superfluid suppressor. It also involves many fields such as low temperature physics and ultra-low temperature technology, low temperature physics experiment technology, dilution refrigerator, fluid dynamics, thermodynamics and heat transfer. Background technique [0002] Under normal atmospheric pressure, when the temperature drops below 2.17K, the helium-4 liquid will appear superfluid (this phenomenon is the characteristic of helium four superfluid), and there is helium-4 superfluid in the distillation chamber of the dilution refrigerator The liquid, helium-4 superfluid, would crawl up the side walls of the distillation chamber. Through experiments, it is found that this flow is almost a "crawling flow" without viscous consumption. Its characteristic is that the specific heat of helium-4 superfluid a...

AI Technical Summary

Problems solved by technology

According to empirical data, when the content of helium-4 in the reflux mixture in the dilution refrigerator exceeds 10%, the dilution refrigerator will not work properly.

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