Vacuum liquid refrigeration sampling device

Abstract

The invention discloses a vacuum liquid refrigeration sampling device. The device refrigerates liquid sprayed into a vacuum chamber through low temperature, and the situation that evaporation of the liquid breaks vacuum of the vacuum chamber is avoided. The device mainly comprises the vacuum chamber, a capillary pipe, an air exhaust system, a cold trap and a liquid analysis zone. After a liquid sample is sprayed into the vacuum chamber through the capillary pipe, the liquid sample moves downward to penetrate through a small hole in an upper cover of the cold trap and then enters a refrigerating chamber to be refrigerated. The vacuum liquid refrigeration sampling device has the advantages that under the vacuum condition, liquid jets can be directly analyzed. Meanwhile, the vacuum can be maintained 1*10-5Pa-1*10-2Pa, the cost is low and disassembly is convenient.

Description

technical field [0001] The invention mainly relates to the field of vacuum technology, especially a vacuum chamber which needs direct liquid and higher vacuum degree, and the direct research on the liquid surface. Background technique [0002] With the development of vacuum technology, it is more and more common to analyze and study gas or solid samples under vacuum conditions. When studying the surface properties of liquids under atmospheric pressure, there will always be interference from the air. Only in vacuum can the real surface properties of liquids be studied. However, the direct analysis of liquid samples faces many challenges, among which the maintenance of chamber pressure has always been a difficult problem. When analyzing gas samples and solid samples, the injection volume of gas is small, which has little effect on the pressure in the vacuum chamber; the vapor pressure of solid samples is small, and has little effect on the pressure in the vacuum chamber. Whe...

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Problems solved by technology

Although the former is feasible, this method requires many pumps and is expensive. Generally, cold traps are used to freeze the liquid beams.

[0003] However, due to the need to freeze liquid samples, the temperature of the cold trap is -20 to -100 degrees Celsius, which will greatly damage the sealing effect of the O-ring of the sealing part of the vacuum chamber.

If the cold trap is directly welded on the cavity of the vacuum chamber, although the influence of the low temperature of the cold trap on the seal can be solved, the processing technology is complicated, and it is very inconvenient to disassemble and clean

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