A Mechanical Cryo-Trap Based on Moving Parts

Abstract

The invention discloses a mechanical low-temperature cold trap based on moving parts, including: a cold head; an elastic drying tube and an enrichment tube; Push the tube to the cold head and keep the drying tube and the enrichment tube in the first working position of this position, and when the cryogenic cold trap is in the high temperature mode, release the drying tube and the enrichment tube in the second working position; When the cryogenic cold trap is in the high temperature mode, there is a gap between the drying pipe, the enrichment pipe and the cold head. In the present invention, by setting the moving parts, the position of the drying tube and the enrichment tube relative to the cold head of the cryogenic cold trap can be changed in real time under different working modes, which reduces the heat leakage loss and the heat load of the refrigerator, and improves the energy efficiency of the cold head and the enrichment efficiency of the cryogenic cold trap.

Description

technical field [0001] The invention belongs to the technical field of low temperature cold trap design, in particular to a mechanical low temperature cold trap based on moving parts. Background technique [0002] In recent years, with the emphasis on air pollution control, especially urban smog control, the monitoring and control of subdivided pollutants such as volatile organic compounds (VOCs) have also been frequently put on the agenda. VOCs (volatile organic compounds) refer to organic compounds with a saturated vapor pressure greater than 70Pa at normal temperature and a boiling point below 260°C at normal pressure. However, the VOCs monitoring link is weak and the method system is not perfect, which affects the implementation of VOCs governance work and the effective supervision of governance facilities. Relevant experts suggest that in the near future, the country should further increase investment in research and development of detection and analysis equipment, and...

AI Technical Summary

Problems solved by technology

[0008] At present, cascade coke-soup refrigerators are generally chosen to provide ultra-low temperature cold sources for cryogenic traps, but this method has relatively large limitations.

First of all, the coke soup refrigerator has a high cooling efficiency in the general cold temperature zone, but this kind of refrigerator needs to obtain a lower cooling temperature through a multi-stage cascading method, resulting in low cooling efficiency, high energy consumption and large volume

Secondly, due to the large span of the refrigeration temperature range, it is often necessary to use composite refrigerants to obtain extremely low temperatures below -150°C. A slight leak of the composite refrigerant can cause the refrigerator to fail, which will undoubtedly increase the difficulty of operation.

[0009] In short, the -150°C low-temperature cold trap products on the market are currently scarce, and the existing products all use the self-cascading refrigeration method to provide the cold source, which is bulky, high energy consumption, and has major deficiencies.

[0010] In addition, the current structure of the cryogenic cold trap adopts a static mechanism, that is, no matter in the low temperature mode or in the high temperature mode, the distance and position of the drying tube and the enrichment tube relative to the cold head are unchanged. As a result, when the two modes work alternately, the energy consumption and heat leakage are large, and the cooling or heating efficiency is low

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