Double-channel low-temperature trapping and rapid heating device

Abstract

The invention discloses a double-channel low-temperature trapping and rapid heating device. The device comprises extension hoods, a cold well extension, a cold well polytetrafluoroethylene joint, cooling fin fixing frames, a cold well fixing frame, a semiconductor chilling plate, a cooling fin pressing plate, a cooling fin, cold well red copper, a heating frame, a cold well side plate and a trapping pipe. The cold well extension is fixedly mounted on sides of the two extension hoods; four cooling fin fixing frames are vertically and fixedly installed on the two sides of the inner walls of theextension hoods correspondingly; and the upper parts and the lower parts of the four radiating fin fixing frames are used for fixedly mounting the two radiating fins at the upper parts and the lower parts in the extension hoods. According to the invention, the novel dual-channel low-temperature trapping and rapid heating system is compact in structure; low-temperature trapping at the lowest temperature of -40 DEG C and rapid heating at the heating rate of about 3000 DEG C / min can be achieved, and no condensate water is separated out; the low-temperature trapping and rapid heating system can realize low-temperature trapping and rapid heating of the two trapping pipes at the same time; and the trapping pipe is convenient to replace without any tool.

Description

technical field [0001] The invention relates to the technical field of cryogenic traps, in particular to a dual-channel cryogenic trap and rapid heating device. Background technique [0002] Small-volume cryogenic traps are mainly used for the detection of volatile organic compounds VOCs: secondary thermal desorption instrument (thermal desorption), purge and trap instrument, automatic dynamic headspace sampler, existing cryogenic trap It is mainly refrigerated by an electronic refrigeration chip, the cooling power is limited, the actual temperature in the collection tube is higher than -10°C, only one collection tube can be installed, the seal between the collection tube and the cold chamber is not good, and it is easy to condense after long-term use Moisture in the air, the outflow of condensed water will pollute the machine and even cause electrical damage. The trap tube in the cryogenic trap needs to be heated up rapidly in the experiment to desorb the volatile organic ...

AI Technical Summary

Problems solved by technology

[0002] Small-volume cryogenic traps are mainly used for the detection of volatile organic compounds VOCs: secondary thermal desorption instrument (thermal desorption), purge and trap instrument, automatic dynamic headspace sampler, existing cryogenic trap It is mainly refrigerated by an electronic refrigeration chip, the cooling power is limited, the actual temperature in the collection tube is higher than -10°C, only one collection tube can be installed, the seal between the collection tube and the cold chamber is not good, and it is easy to condense after long-term use Moisture in the air, the outflow of condensed water will pollute the machine and even cause electrical damage

The trap tube in the cryogenic trap needs to be heated up rapidly in the experiment to desorb the volatile organic compounds VOCs trapped in the trap tube. The temperature control of the current equipment on the market is not accurate, and the temperature overshoot is easy to damage the adsorption filler in the trap tube.

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