JP3158049U - Gas chromatograph - Google Patents

Abstract

A gas chromatograph that secures a column insertion length for a detector block and a sample vaporization chamber as specified. In order to regulate the column insertion length in the detector block 4 and the sample vaporization chamber, a locking portion 11 that contacts the tip of the column 1 is provided, and a conical recess 12 that expands toward the column insertion port. Form. In addition, the ferrule 2 that slides on the column 1 is provided with a conical convex portion 13 whose outer peripheral portion is reduced toward the front end and a conical concave portion 17 that is enlarged toward the front end, whereby the front end of the column 1 is damaged. Therefore, the mounting operation can be performed easily and accurately. [Selection] Figure 1

Description

  The present invention relates to a gas chromatograph used for sample analysis, and more particularly, to a gas chromatograph in which a column is provided in a sealing ferrule for connecting the detector and column of the gas chromatograph or the sample vaporizing chamber and the column.

  A gas chromatograph, a type of analyzer, continuously flows a carrier gas, which is a mobile phase, into a column packed with a stationary phase, and instantaneously introduces the mixed sample from the inlet of the column. A device that separates components from each other using a difference in adsorption speed (affinity) of each component with respect to the stationary phase and a difference in partition coefficient while moving through the column, and performs quantitative qualitative analysis (patent) Reference 1).

  A part of the gas chromatograph is constituted by the column, the sample vaporizing chamber and the detector block that are hermetically connected to both ends of the column. The mixed sample passes through the sample vaporization chamber or column together with the carrier gas, and is introduced into the detector through the detector block together with the detector gas introduced from the detector gas introduction path.

  FIG. 4 shows a detector block and a column connected to each other in the detector block as an example in order to explain a detector block and a sample vaporization chamber in a conventional gas chromatograph. By tightening the nut 3 screwed into the threaded portion 7N of the detector block 7, the conical convex portion 19 of the ferrule 6 penetrating the column 1 is pressed against the conical concave portion 18 of the detector block 7, thereby detecting The detector block 7 and the ferrule 6 and the ferrule 6 and the column 1 are connected, and as a result, the detector block 7 and the column 1 are hermetically connected.

  Therefore, the mixed sample passes through the sample vaporization chamber (not shown) as a continuous flow together with the carrier gas, passes through the column 1 and the detector gas introduced from the detector gas introduction path 23. 7 is introduced into a detector (not shown).

  When the column 1 is attached to a gas chromatograph, it is important to set the column insertion length for the detector block 7 and the sample vaporization chamber (not shown), which has an important influence on the sensitivity and accuracy of sample analysis.

  In the sample vaporizing chamber (not shown), the vaporized sample is introduced from the tip of the column 1, and the optimum column insertion length is set because the introduction amount or introduction timing differs depending on the position. Also in the detector block 7, since the detection sensitivity, the minimum detection amount, etc. are influenced by the position of the tip of the column 1, the optimum column insertion length is set similarly.

  Therefore, normally, the column insertion length is predetermined for the detector block 7 or the sample vaporizing chamber (not shown), and the value is described in an instruction manual of the gas chromatograph. The analyst checked the column insertion length one by one while applying a ruler such as a ruler when installing the column.

Japanese Patent Laid-Open No. 7-20112

  The analyst tightens the conical convex portion 19 of the ferrule 6 passed through the column 1 with the nut 3 while checking the column insertion length with respect to the detector block 7 and the sample vaporizing chamber (not shown) with a ruler or the like when installing the column. Then, the detector block 7 and the ferrule 6 and the ferrule 6 and the column 1 are fixed to each other by being pushed into the conical recess 18 of the detector block 7, and as a result, the detector block 7 and the column 1 are hermetically connected.

  However, since the column 1 and the ferrule 6 are in a sliding relationship with a minute gap, it is very difficult to tighten the nut 3 while maintaining the position of the column 1 and the ferrule 6 at the specified dimensions. After fixing, the column insertion length was once removed and the column insertion length was measured and confirmed. If the column insertion length was not secured, correction was necessary.

  In order to solve the above problems, the present invention provides a sample vaporization chamber for vaporizing an injected sample, a column inserted into the sample vaporization chamber and into which the vaporized sample is introduced, and the column is inserted into the column. The sample that has passed through the column elutes, and a detector block for mounting a detector for quantitative qualitative analysis of the sample, and a ferrule for hermetically connecting the sample vaporization chamber and the detector block to the inserted column In the gas chromatograph provided, the sample vaporizing chamber and the detector block are provided with locking portions for locking the column inserted into the sample vaporizing chamber and the detector block.

  When attaching the column to the detector block and the sample vaporization chamber according to the present invention, it is not necessary to check the column insertion length while applying a ruler such as a ruler. It is only necessary to tighten, and the operation can be performed easily and accurately.

It is a figure which shows the Example concerning this invention, and is the conceptual diagram which shows the part which seal-connects a detector block and a column in a cross section. It is a conceptual diagram which shows the structure of the gas chromatograph of this invention. It is a figure which shows the modified example concerning this invention, and is sectional drawing of the ferrule concerning this modified example. It is a conceptual diagram which shows the part which seals and connects the conventional detector block and a column in a cross section.

  In addition to the sample vaporization chamber and detector block, there is an internal locking section that regulates the column insertion length for the sample vaporization chamber and detector block to a predetermined optimum value, and it expands toward the column insertion port. A conical recess is formed. Further, with respect to the ferrule, the outer peripheral portion is reduced toward the end fitting into the conical concave portion of the sample vaporizing chamber and the detector block, and the conical convex portion and the inner peripheral portion are conical shapes expanding toward the end portion. A recess is formed.

  FIG. 2 is a conceptual diagram showing the configuration of a gas chromatograph according to the present invention. As shown in FIG. 2, the main components of the gas chromatograph are a sample vaporization chamber 14 into which a sample to be analyzed is injected, and a main body that causes the sample from the sample vaporization chamber 14 to flow together with a carrier gas and separates according to the components. And a connecting tool (ferrule) for connecting the column 1 between the sample vaporizing chamber 14 and the detector block 4 of the detector 16.

  The flow of analysis will be described with reference to FIG. 2. In the sample vaporization chamber 14, a small amount of sample is introduced into the carrier gas flow introduced from the carrier gas inlet 15 and passed through the gas passage 21 provided in the locking portion 22. Is injected. If the sample is a gas, the sample is left as it is; if it is a liquid sample, the sample heated to an appropriate temperature and vaporized in the gas state in the sample vaporization chamber 14 is carried to the carrier gas and provided in the locking portion 22. Each component is separated while passing through the column 1 through the small holes 20.

  The sample separated into each component elutes into the detector block 4 through the small hole 9 provided in the locking part 11 and is introduced from the detector gas introduction path 8 and is provided in the locking part 11. After joining the detector gas that has passed 10, it flows into the detector 16, where the component and amount of the sample are detected, and finally, it is released from the discharge path (not shown) to the atmosphere.

  Here, since the sample to be analyzed needs to be vaporized, the column 1 is generally stored in a thermostat (not shown). The sample vaporizing chamber 14 is housed in a thermostat (not shown) separate from the column 1 so that the sample is kept in a gaseous state and is not affected by ambient temperature changes.

  In relation to the configuration of the gas chromatograph of Example 1 shown in FIG. 2, FIG. 1 shows a portion where the detector block and the column are hermetically connected. In order to regulate the column insertion length with respect to the detector block 4, a locking portion 11 for locking the tip of the column 1 is provided, and a conical concave portion 12 that expands toward the column insertion port is provided in the detector block 4. Form. The hollow ferrule 2 that slides on the column 1 is provided with a conical convex portion 13 whose outer peripheral portion is reduced toward the tip and a conical concave portion 17 whose inner peripheral portion is enlarged toward the tip. In FIG. 2, parts denoted by the same reference numerals as in FIG. 1 are the same parts as in FIG.

  When the tip of the column 1 penetrating the ferrule 2 is lightly pressed against the locking portion 11 and the conical convex portion 13 of the ferrule 2 is pushed into the conical concave portion 12 of the detector block 4 while tightening the nut 3, the ferrule The two conical convex portions 13 are pressed and brought into close contact with the conical concave portion 12 of the detector block 4 so that the detector block 4 and the ferrule 2 are sealed. When the nut 3 is further pushed forward, the ferrule 2 is contracted in the radial direction by the reaction force generated by the pressing of the conical concavo-convex portions 12 and 13, and the column 1 and the ferrule 2 are fixedly sealed by the fixing portion B.

  When the nut 3 is further pushed forward, the ferrule 2 is slightly deformed with the fulcrum A as a fulcrum while the conical convex portion 13 of the ferrule 2 and the conical concave portion of the detector block 4 are maintained, and the fixing portion B is formed. It moves slightly in the direction away from the fulcrum A. Since the front end of the column 1 is also retracted from the locking portion 11 together with the movement of the fixing portion B, a minute gap is formed between the front end of the column 1 and the locking portion 11, and the column front end is not damaged. Is secured. Therefore, when the column is attached to the detector block 4 according to the present invention, the attaching operation can be performed easily and accurately.

  The engaging portion 11 is provided with a small hole 9 slightly smaller than the outer diameter of the column at a position coinciding with the gas passage 10 and the axis of the column 1. The sample gas that has passed through the column 1 passes through the small hole 9, and the detector gas introduced from the detector gas introduction passage 8 passes through the gas passage 10.

  The sample vaporizing chamber 14 has a sealed connection structure similar to that of the detector block 4. That is, the sample vaporizing chamber 14 is also structured to be hermetically connected to the column 1 and can be easily and accurately attached.

  Example 2 is shown in FIG. The second embodiment is a modification of the ferrule shape of the first embodiment. Except for this, the second embodiment is exactly the same as the first embodiment, and the functions are also exactly the same as the first embodiment. Therefore, only ferrule 5 is shown in FIG. However, the tightening force of the nut 3 for hermetically connecting the column 1 is larger in the ferrule 5 which is a solid shape than the hollow ferrule 2 which is easily deformed, but the ferrule 5 is less expensive to manufacture. And easy.

DESCRIPTION OF SYMBOLS 1 Column 2 Ferrule 3 Nut 4 Detector block 5 Ferrule 6 Ferrule 7 Detector block 8 Detector gas introduction path 9 Small hole 10 Gas passage 11 Locking part 12 Conical concave part 13 Conical convex part 14 Sample vaporization chamber 15 Carrier gas Inlet 16 Detector 17 Conical concave portion 18 Conical concave portion 19 Conical convex portion 20 Small hole 21 Gas passage 22 Locking portion 23 Detector gas introduction passage A Support point B Adhering portion 7N Screw portion

Claims (4)

  A sample vaporization chamber for vaporizing the injected sample, a column inserted into the sample vaporization chamber and into which the vaporized sample is introduced, a sample inserted through the column and passed through the column is eluted, and the In a gas chromatograph comprising a detector block for mounting a detector for quantitative qualitative analysis of a sample, and a ferrule for hermetically connecting the sample vaporization chamber and the detector block to the inserted column, the sample vaporization chamber and A gas chromatograph, wherein a locking portion for restricting a tip position of the column inserted into the detector block is provided in the sample vaporizing chamber and the detector block.   The sample vaporization chamber and the detector block forming a conical recess that expands toward the column insertion port are provided, and the ferrule has an outer peripheral portion that fits into the sample vaporization chamber and the conical recess of the detector block. The gas chromatograph according to claim 1, wherein a conical convex portion and an inner peripheral portion that are reduced toward the end portion are formed with a conical concave portion that is enlarged toward the end portion.   The gas chromatograph according to claim 1, wherein the locking portion is provided at a position that regulates an insertion length of the column with respect to the sample vaporizing chamber and the detector block to a predetermined value.   The gas chromatograph according to claim 1, 2 or 3, wherein a hole smaller than the outer diameter of the column is formed on a column axis of the locking portion.

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