Filtering, throttling and evaporating integrated device for liquid helium temperature zone

Abstract

The invention discloses a filtering, throttling and evaporating integrated device for a liquid helium temperature zone. The filtering, throttling and evaporating integrated device for the liquid helium temperature zone comprises a filtering unit, a throttling unit and an evaporation unit. The filtering unit is used for filtering solid impurity particles before throttling and preventing the solid particles from blocking small throttling holes in a throttling orifice plate. In the throttling unit, a throttling flange is used for fixing a throttling orifice plate to a throttling base, a sealing silver ring is arranged on one side of the throttling orifice plate, the sealing silver ring deforms under the action of a fastening screw, so that the sealing effect is achieved. An evaporator inner core in the evaporation unit is a multi-layer silk screen or a porous medium, so that the heat exchange efficiency of the evaporation unit can be effectively improved; an evaporator shell can be machined into various appearance structures, so that coupling with connectors such as a detector and a cold chain is facilitated. The filtering, throttling and evaporating integrated device for the liquid helium temperature zone has the advantages that the filtering unit, the throttling unit and the evaporation unit are integrated, the structure is compact, the problem that the throttling orifice plate of the throttling refrigerating machine in the liquid helium temperature zone is blocked is effectively solved, and the operation stability of the throttling refrigerating machine in the liquid helium temperature zone is improved.

Description

Technical field: [0001] The invention belongs to the field of cryogenic refrigeration, and specifically relates to a device integrating filtration, throttling and evaporation in a liquid helium temperature zone. Background technique: [0002] The working temperature of space detectors such as quantum superconducting interference devices in space detectors, space far-infrared detectors, millimeter wave and submillimeter wave detectors, and cosmic background detection is in the liquid helium temperature zone or even the mK temperature zone, where the mK temperature zone Refrigeration requires a liquid helium temperature zone refrigerator to pre-cool it. Pre-cooled Joule-Thomson (JT) throttling refrigeration is a high-reliability deep-low temperature refrigeration method. Compared with traditional low-temperature refrigeration methods, it eliminates mechanical moving parts at the cold end and is based on the JT throttling refrigeration effect. Refrigeration, in order to reach ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a device with simple and compact structure, high reliability, high heat exchange efficiency, which is convenient for coupling with the detector and integrates filtration, throttling and evaporation, which solves the problem of complicated throttling and evaporation unit devices in the existing cryogenic refrigeration system. Not compact, low reliability, low heat transfer efficiency, etc.

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