Capillary tube sample injector connector connecting structure for gas chromatograph
By improving the connection structure of the capillary sampler joint, the combination of nuts, connectors and sealed graphite pads, the sample residue problem caused by large outer gap of the capillary sampler column is solved, and high sensitivity and stable detection effect is achieved.
Patent Information
- Application Number
- CN202422260228.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-14
AI Technical Summary
In existing gas chromatographs, the outer column gap of the capillary injector is large, resulting in sample residue affecting the detection results.
Using a combined structure of nuts, connectors, column screws and sealing graphite pads, the gap between the connector and the capillary column is shortened and sample residue is reduced through threaded connection and sealing design.
Effectively reduce sample residue, improve separation ability and resolution, improve detection sensitivity and reproducibility of detection results, and ensure process stability.
Smart Images
Figure CN223120870U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of gas chromatographs, and particularly to a capillary injector joint connection structure for a gas chromatograph. Background Art
[0002] A gas chromatograph uses gas as the mobile phase and utilizes the distribution difference of substances between the stationary phase and the mobile phase to qualitatively and quantitatively analyze complex mixtures of multiple components. The chromatographic column is a key component for achieving component separation.
[0003] Among various chromatographic columns, capillary columns are increasingly used in gas chromatographs because of their small inner wall area, large surface activity, relatively slow flow rate, long residence time of samples on the inner wall surface, which can greatly improve the separation ability and resolution. Moreover, the small sample loading capacity of capillary columns results in high detection sensitivity and good reproducibility. However, the commonly used capillary column installation structure has a large outer-column gap, which is prone to sample residue, especially when analyzing gas samples, resulting in the detection of impurity peaks or interference peaks.
[0004] When the capillary injector has a large outer-column gap and is prone to sample residue, which affects the test results, there is a problem of reducing the gap of the existing structure. In view of this, a capillary injector joint connection structure for a gas chromatograph is provided. Summary of the Utility Model
[0005] The main purpose of the utility model is to provide a capillary injector joint connection structure for a gas chromatograph, so as to solve the problem that in the related art, when the capillary injector has a large outer-column gap and is prone to sample residue, which affects the test results, there is a need to reduce the gap of the existing structure.
[0006] To achieve the above purpose, according to one aspect of the utility model, a capillary injector joint connection structure for a gas chromatograph is provided, including a nut, a connecting piece is arranged inside the nut, a column screw is arranged at the bottom of the connecting piece, a sealing graphite gasket is arranged between the column screw and the connecting piece, a capillary column of the capillary injector penetrates through the column screw, and one end of the capillary column sequentially penetrates through the sealing graphite gasket and the connecting piece;
[0007] Wherein, a screw hole is formed through the nut, and an installation groove a with an inner diameter larger than that of the screw hole is formed at the top of the nut.
[0008] As a preferred technical solution of the utility model, the connecting piece is integrally formed by a stud and a cone at the top of the stud, a cylinder is fixedly arranged at the top of the cone, a rectangular slot is formed at the center of the top of the cylinder, and the stud is threadedly connected with the inner wall of the installation groove a.
[0009] As a preferred technical solution of the present utility model, a connecting column is fixedly arranged at the bottom of the stud, and a conical groove is formed on the lower surface of the connecting column.
[0010] As a preferred technical solution of the present utility model, the upper end of the sealing graphite pad is of a conical structure, and the lower end is of a cylindrical shape.
[0011] As a preferred technical solution of the present utility model, an installation groove b is formed at the top of the stud screw. When the bottom of the connecting member is in close fit with the top of the stud screw, the bottom of the sealing graphite pad is inserted into the installation groove b, and the top of the sealing graphite pad is inserted into the conical groove.
[0012] As a preferred technical solution of the present utility model, the stud screw is in threaded connection with the inner wall of the screw hole.
[0013] As a preferred technical solution of the present utility model, a pointed columnar hole with an inner diameter larger than the outer diameter of the capillary column is formed on the lower surface of the stud screw, and a connecting hole for communicating the pointed columnar hole and the installation groove b is formed through the stud screw, and the connecting hole is used for inserting the capillary column.
[0014] Compared with the prior art, the present utility model has the following beneficial effects:
[0015] In the capillary injector joint connection structure for a gas chromatograph, by changing the connection method, the formation of the gap between the middle inner hole of the connecting member and the capillary column is shortened, so that the dead area outside the capillary column is effectively reduced, the influence of sample residue on the detection result is reduced, the separation ability and resolution are improved, the detection sensitivity is high and the reproducibility is good, and the stability of the process is also ensured. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the overall capillary injector joint connection structure in the preferred embodiment of the present utility model;
[0017] Figure 2 It is a schematic sectional view of the capillary injector joint connection structure in the preferred embodiment of the present utility model;
[0018] Figure 3 It is a schematic sectional view of the nut in the preferred embodiment of the present utility model;
[0019] Figure 4 It is a schematic sectional view of the nut and the connecting member in the preferred embodiment of the present utility model;
[0020] Figure 5 It is a schematic sectional view of the stud screw in the preferred embodiment of the present utility model.
[0021] Illustration:
[0022] 1. Nut; 11. Screw hole; 12. Installation groove a;
[0023] 2. Connector; 21. Cone; 22. Stud
[0024] 3. Sealing graphite gasket
[0025] 4. Column screw; 41. Mounting groove b; 42. Pointed columnar hole
[0026] 5. Capillary column Detailed implementation manners
[0027] To further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined utility model purpose, the following combines the accompanying drawings and preferred embodiments to detail the specific implementation manners, structures, features and their effects according to the present utility model as follows.
[0028] Please refer to Figures 1-5 As shown, the purpose of this embodiment is to provide a capillary injector joint connection structure for a gas chromatograph, including a nut 1. A connector 2 is arranged inside the nut 1. The connector 2 is integrally formed by a stud 22 and a cone 21 at the top of the stud 22. A cylinder is fixedly arranged at the top of the cone 21, and a rectangular slot is opened at the center of the top of the cylinder for the engagement and screwing of a screwdriver for fixation. A connecting column is fixedly arranged at the bottom of the stud 22, and a conical groove is opened on the lower surface of the connecting column.
[0029] A column screw 4 is arranged at the bottom of the connector 2. A sealing graphite gasket 3 is arranged between the column screw 4 and the connector 2. The upper end of the sealing graphite gasket 3 is a conical structure, and the lower end is a cylinder. An installation groove b41 is opened at the top of the column screw 4. When the bottom of the connector 2 is in close contact with the top of the column screw 4, the bottom of the sealing graphite gasket 3 is inserted into the installation groove b41, and the top of the sealing graphite gasket 3 is inserted into the conical groove. The sealing graphite gasket 3 has good sealing performance, high compressive strength and hardness, and a long service life.
[0030] A capillary column 5 of the capillary injector penetrates through the column screw 4. A pointed columnar hole 42 with an inner diameter larger than the outer diameter of the capillary column 5 is opened on the lower surface of the column screw 4, and there is a chamfer at the bottom of the pointed columnar hole 42. A connecting hole is opened through the column screw 4 to communicate the pointed columnar hole 42 and the installation groove b41 for the insertion of the capillary column 5. One end of the capillary column 5 sequentially penetrates through the sealing graphite gasket 3 and the connector 2 to combine all parts in a compact and orderly manner.
[0031] Among them, a threaded hole 11 is formed through the nut 1, and an installation groove a12 with an inner diameter larger than that of the threaded hole 11 is formed at the top of the nut 1. The stud 22 is threadedly connected to the inner wall of the installation groove a12, and the column screw 4 is threadedly connected to the inner wall of the threaded hole 11. The threaded connection structure is convenient for disassembly, occupies a small space and is closely arranged, so that the overall airtight performance of the device is improved, the process stability is ensured, and the influence of samples on the experimental results is reduced.
[0032] When the present utility model is specifically used, first place the connecting piece 2 into the nut 1 and screw it to the lower end of the capillary sampler, then pass the column screw 4 and the sealing graphite gasket 3 through the capillary column 5, and then through the inner hole of the fixed connecting piece 2, and finally tighten the column screw 4 so that the capillary column 5 extends about 6 mm above the upper end of the connecting piece 2.
[0033] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to form equivalent embodiments with equivalent changes, but as long as the technical content of the present utility model is not departed from, any brief modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.
Claims
1. A capillary injector joint connection structure for a gas chromatograph, characterized in that, It includes a nut (1), a connector (2) is arranged inside the nut (1), a stud screw (4) is arranged at the bottom of the connector (2), a sealing graphite gasket (3) is arranged between the stud screw (4) and the connector (2), a capillary column (5) of a capillary injector penetrates through the stud screw (4), and one end of the capillary column (5) penetrates through the sealing graphite gasket (3) and the connector (2) in sequence. Wherein, a threaded hole (11) is formed through the nut (1), and an installation groove a (12) with an inner diameter larger than that of the threaded hole (11) is formed at the top of the nut (1).
2. The capillary injector joint connection structure for a gas chromatograph according to claim 1, characterized in that, The connector (2) is integrally formed by a stud (22) and a cone (21) at the top of the stud (22). A cylinder is fixedly arranged at the top of the cone (21), and a rectangular slot is formed at the center of the top of the cylinder. The stud (22) is threadedly connected with the inner wall of the installation groove a (12).
3. The capillary injector joint connection structure for a gas chromatograph according to claim 2, characterized in that, A connecting column is fixedly arranged at the bottom of the stud (22), and a conical groove is formed on the lower surface of the connecting column.
4. The capillary injector joint connection structure for a gas chromatograph according to claim 1, characterized in that, The upper end of the sealing graphite gasket (3) is of a conical structure, and the lower end is a cylinder.
5. The capillary injector joint connection structure for a gas chromatograph according to claim 1, wherein An installation groove b (41) is formed at the top of the stud screw (4). When the bottom of the connector (2) is in close fit with the top of the stud screw (4), the bottom of the sealing graphite gasket (3) is inserted into the installation groove b (41), and the top of the sealing graphite gasket (3) is inserted into the conical groove.
6. The capillary injector joint connection structure for a gas chromatograph according to claim 1, characterized in that, The stud screw (4) is threadedly connected with the inner wall of the threaded hole (11).
7. The capillary injector joint connection structure for a gas chromatograph according to claim 5, characterized in that, A pointed columnar hole (42) with an inner diameter larger than the outer diameter of the capillary column (5) is formed on the lower surface of the stud screw (4), and a connecting hole communicating the pointed columnar hole (42) and the installation groove b (41) is formed through the stud screw (4). The connecting hole is used for inserting the capillary column (5).