Gas chromatography column head protection device

Abstract

The utility model relates to the technical field of chromatographic column heads, and discloses a gas chromatographic column head protection device which comprises a protection head, a shaft sleeve is connected to the inner wall of the protection head in a sliding mode, a sample injection pipe is installed on the inner wall of the side, away from the protection head, of the shaft sleeve in a threaded mode, and an installation ring is installed on the side, close to the sample injection pipe, of the shaft sleeve in a threaded mode. The side, close to the shaft sleeve, of the mounting ring abuts against a spring, the side, away from the mounting ring, of the spring abuts against a protection head, the mounting ring and the outer wall of the shaft sleeve are installed in a threaded mode, and therefore the spring can be replaced conveniently, and the mounting ring and the protection head can abut against the spring; and the shaft sleeve and the sample injection pipe are installed in a threaded mode, so that the interior of the protection head is convenient to clean, and the protection effect is further achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chromatographic column heads, in particular to a protection device for a gas chromatographic column head. Background Technique

[0002] The material of a gas chromatographic column is generally metal or capillary. Among them, the capillary column is widely used because of its good separation efficiency and easy connection with other instruments. However, the capillary column is brittle and easy to break during assembly.

[0003] In a patented document with the authorized publication number of CN207163996U, a chromatographic column head protection device is disclosed, which includes a protection head, a retaining ring, a bushing, and a compression spring; the protection head is of a hollow structure, and its front end has a conical surface. The bushing is fixed on the inlet of the mass spectrometer. The compression spring is sleeved outside the bushing. One end of the compression spring abuts against the end face of the bushing, and the other end abuts against the protection head. The retaining ring is fixedly arranged inside the protection head and is coaxial with the bushing. When the compression spring is compressed to a set position, the retaining ring is stuck in the groove of the bushing. At this time, the front end of the capillary column is flush with the front end of the protection head; the conical surface at the front end of the protection head is used to cooperate with the outer sleeve of the ion source and automatically center, so as to accurately position the length of the chromatographic column head extending into the mass spectrometer inlet; effectively protect the chromatographic column head during the installation process; simple operation and convenient use; ingenious design and low cost, with broad prospects for popularization and application.

[0004] When the above device is implemented, when the spring is used for a long time, the tension of the spring will change, resulting in a poor reset effect on the protection head. And the spring of this device is not easy to replace, so it may cause damage to the capillary column when installing the capillary column. Content of the Utility Model

[0005] The purpose of the utility model is to provide a protection device for a gas chromatographic column head, which solves the problem that when the above device is implemented, when the spring is used for a long time, the tension of the spring will change, resulting in a poor reset effect on the protection head. And the spring of this device is not easy to replace, so it may cause damage to the capillary column when installing the capillary column.

[0006] The embodiment of the present application provides a protection device for a gas chromatographic column head, which includes a protection head. A bushing is slidably connected to the inner wall of the protection head. A sampling tube is threadedly installed on the inner wall of the bushing away from the protection head. A mounting ring is threadedly installed on the side of the bushing close to the sampling tube. A spring abuts against the side of the mounting ring close to the bushing, and the side of the spring away from the mounting ring abuts against the protection head.

[0007] By adopting the above technical solution, the mounting ring is threadedly mounted on the outer wall of the bushing, so as to facilitate the replacement of the spring. Moreover, the mounting ring and the protective head can abut against the spring, and then the protective head can play a role of abutting and resetting when sliding on the outer wall of the bushing. The bushing is threadedly mounted on the sampling tube, which is convenient for cleaning the inside of the protective head and further plays a role of protection.

[0008] Optionally, a plurality of locking holes are provided on the conical surface of the protective head.

[0009] By adopting the above technical solution, the installation of the protective head and the ion source can be facilitated through the arrangement of the locking holes.

[0010] Optionally, a sealing ring is placed between the bushing and the sampling tube.

[0011] By adopting the above technical solution, the sealing ring can play a sealing role between the bushing and the sampling tube.

[0012] Optionally, a capillary column is slidably inserted through the inner walls of the protective head, the bushing and the sampling tube.

[0013] By adopting the above technical solution, the protective head, the bushing and the sampling tube can play a role of wrapping and protecting the capillary column.

[0014] Optionally, a sampling seat is fixedly connected to the outer wall of the sampling tube on the side far from the bushing.

[0015] By adopting the above technical solution, the sampling seat can play a role of fixing the sampling tube.

[0016] Optionally, a limiting ring is fixedly connected to the outer wall of the bushing located inside the protective head.

[0017] By adopting the above technical solution, the bushing can play a role of fixing the limiting ring, and the limiting ring can play a role of sliding limit for the protective head.

[0018] Optionally, a conical ring is fixedly connected to the inner wall of the bushing on one side of the limiting ring, and the side of the protective head away from the bushing is provided with a conical surface.

[0019] By adopting the above technical solution, the entry of the capillary column is facilitated by the contact between the conical ring and the inner conical surface of the protective head.

[0020] Compared with the prior art, the beneficial effects of the technical solution of the present application are as follows:

[0021] The technical solution of this application is installed by screwing the installation ring onto the outer wall of the bushing, which facilitates the replacement of the spring. Moreover, the installation ring and the protection head can abut against the spring, and then the protection head can play a role of abutting and resetting when sliding on the outer wall of the bushing. The bushing is threadedly installed with the sampling tube, which facilitates the cleaning inside the protection head and further plays a protective role. Brief Description of the Drawings

[0022] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, objectives, and advantages of the present utility model will become more apparent:

[0023] Figure 1 It is a front view schematic diagram of the gas chromatography column head protection device of the present utility model;

[0024] Figure 2 It is a partial front sectional view of the gas chromatography column head protection device of the present utility model;

[0025] Figure 3 It is the Figure 2 enlarged view of part A in the gas chromatography column head protection device of the present utility model;

[0026] Figure 4 It is the Figure 2 enlarged view of part B in the gas chromatography column head protection device of the present utility model.

[0027] In the figure: 1. Protection head; 2. Bushing; 3. Sampling tube; 4. Installation ring; 5. Spring; 6. Sealing ring; 7. Capillary column; 8. Locking hole; 9. Limiting ring; 10. Conical ring; 11. Sampling seat. Detailed Embodiment

[0028] Please refer to Figures 1-4 , the present utility model provides a technical solution: a gas chromatography column head protection device, including a protection head 1. The inner wall of the protection head 1 is slidably connected with a bushing 2. The inner wall of the bushing 2 on the side far from the protection head 1 is threadedly installed with a sampling tube 3. The side of the bushing 2 close to the sampling tube 3 is threadedly installed with an installation ring 4. The side of the installation ring 4 close to the bushing 2 abuts against a spring 5. The side of the spring 5 far from the installation ring 4 abuts against the protection head 1. The outer wall of the bushing 2 located inside the protection head 1 is fixedly connected with a limiting ring 9. The inner wall of the bushing 2 on the side of the limiting ring 9 is fixedly connected with a conical ring 10. The side of the protection head 1 far from the bushing 2 is provided with a conical surface.

[0029] In the technical solution of the present utility model, the mounting ring 4 is threadedly mounted on the outer wall of the bushing 2, so as to facilitate the replacement of the spring 5, and the mounting ring 4 and the protection head 1 can abut against the spring 5. Then, when the protection head 1 slides on the outer wall of the bushing 2, it can play a role of abutting and resetting. The bushing 2 is threadedly mounted on the sampling tube 3, which is convenient for cleaning the inside of the protection head 1 and further plays a protective role.

[0030] In addition, the bushing 2 can fix the limit ring 9, and the limit ring 9 can play a role of sliding limit for the protection head 1. By contacting the inner conical surface of the protection head 1 with the conical ring 10, it is convenient for the tube material to enter.

[0031] In the technical solution of the present utility model, as Figure 2 shown, a sealing ring 6 is placed between the bushing 2 and the sampling tube 3. The sealing ring 6 can play a sealing role between the bushing 2 and the sampling tube 3. A capillary column 7 slidably penetrates through the inner walls of the protection head 1, the bushing 2 and the sampling tube 3. The protection head 1, the bushing 2 and the sampling tube 3 can play a role of wrapping and protecting the capillary column 7. A sampling seat 11 is fixedly connected to the outer wall of the sampling tube 3 on the side far from the bushing 2. The sampling seat 11 can play a role of fixing the sampling tube 3.

[0032] In the technical solution of the present utility model, as Figure 1 shown, a plurality of groups of locking holes 8 are formed in the conical surface of the protection head 1. The arrangement of the locking holes 8 can facilitate the installation of the protection head 1 and the ion source.

[0033] During use, first, the mounting ring 4 can be threadedly mounted on the outer wall of the bushing 2, so as to facilitate the replacement of the spring 5. The mounting ring 4 and the protection head 1 can abut against the spring 5. Then, when the protection head 1 slides on the outer wall of the bushing 2, it can play a role of abutting and resetting. The bushing 2 is threadedly mounted on the sampling tube 3, which is convenient for cleaning the inside of the protection head 1 and further plays a protective role. The sealing ring 6 can play a sealing role between the bushing 2 and the sampling tube 3. The limit ring 9 can play a role of sliding limit for the protection head 1. The conical ring 10 contacts the inner conical surface of the protection head 1, which is convenient for the entry of the capillary column 7.

Claims

1. Gas chromatography column head protection device, characterized in that: It includes a protective head (1), the inner wall of the protective head (1) is slidably connected with a bushing (2), the inner wall of the side of the bushing (2) away from the protective head (1) is threadedly installed with a sampling tube (3), the side of the bushing (2) close to the sampling tube (3) is threadedly installed with a mounting ring (4), the side of the mounting ring (4) close to the bushing (2) abuts against a spring (5), and the side of the spring (5) away from the mounting ring (4) abuts against the protective head (1).

2. The gas chromatography column head protection device according to claim 1, characterized in that, A plurality of locking holes (8) are formed in the conical surface of the protective head (1).

3. The gas chromatography column head protection device according to claim 1, characterized in that, A sealing ring (6) is placed between the bushing (2) and the sampling tube (3).

4. The gas chromatography column head protection device according to claim 1, characterized in that, A capillary column (7) is slidably penetrated through the inner walls of the protective head (1), the bushing (2) and the sampling tube (3).

5. The gas chromatography column head protection device according to claim 1, characterized in that, The outer wall of the side of the sampling tube (3) away from the bushing (2) is fixedly connected with a sampling seat (11).

6. The gas chromatography column head protection device according to claim 1, wherein, A limiting ring (9) is fixedly connected to the outer wall of the bushing (2) located inside the protective head (1).

7. The gas chromatography column head protection device according to claim 6, characterized in that, A conical ring (10) is fixedly connected to the inner wall of the bushing (2) on one side of the limiting ring (9), and the side of the protective head (1) away from the bushing (2) is provided with a conical surface.

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