Vacuum liquid refrigeration sampling device

A sampling device and liquid technology, applied in the field of direct research on the liquid surface in vacuum chambers, can solve the problems of damage to the sealing effect of the O-ring of the sealing part, complicated processing technology, inconvenient disassembly and cleaning, etc., to achieve convenient disassembly and good cooling. Effect

Inactive Publication Date: 2013-06-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[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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  • Vacuum liquid refrigeration sampling device
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Embodiment Construction

[0024] The invention is used for direct vacuum sampling of liquid samples, and the liquid samples are sprayed into the vacuum chamber 1 through the capillary 2 . Part of the liquid sprayed into the vacuum chamber 1 volatilizes into gas, and is discharged to the vacuum chamber through the molecular pump of the exhaust system 3, and most of the liquid enters the cold trap through the inverted tapered small hole 7 at the upper end of the cold trap 4. The area between the outlet of the capillary 2 and the upper end of the cold trap 4 is the liquid analysis area 5 .

[0025] Such as figure 1 As shown, one end of the metal freezing shaft 11 is directly inserted into the liquid nitrogen 10, and the other end is connected with the liquid freezing chamber 9 through threads. The low temperature of the liquid nitrogen is transmitted to the liquid freezing chamber 9 and the cold trap upper cover 6 through the freezing axis 11 . The cold trap upper cover 6 is connected with the liquid fr...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/42G01N1/36
Inventor 李海洋赵无垛王卫国曲丕丞陈文东
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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