Sample injection needle positioning device, gas chromatograph and gas chromatograph-mass spectrometer

Abstract

The utility model provides a sample injection needle positioning device, a gas chromatograph and a gas chromatograph-mass spectrometer, belongs to the field of detection and analysis, and is used for solving the problem that the relative position of a sample injection needle and a sample injection port can only be judged by naked eyes when being debugged in the prior art. Comprising a positioner, a first sample inlet nut and a positioning column, the outer side wall of the positioner body is limited through the first blind hole formed in the first sample injection port nut, the outer side wall of the positioning column is limited through the inner side wall of the first positioning hole, and the hole bottom of the first positioning hole and the bottom of the positioning column are limited through the inner side wall of the first positioning hole. During debugging, debugging work can be completed only by placing the positioner in the first blind hole and placing the positioning column in the first positioning hole, and the situation that deviation is caused by judgment only through naked eyes, and consequently corresponding structures of a sample injection needle and a sample injection port collide is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of detection and analysis, and in particular relates to a syringe positioning device, a gas chromatograph, and a gas chromatography-mass spectrometry system. Background Technology

[0002] Gas chromatography-mass spectrometry (GC-MS) combines the high-efficiency separation capability of gas chromatography with the high-precision detection technology of mass spectrometry. It can perform separation, precise qualitative and quantitative analysis of complex mixtures and has a wide range of applications in environmental monitoring, food safety, medicine and life sciences, and analysis of unknown substances.

[0003] An autosampler is used when operating a gas chromatography-mass spectrometry (GC-MS) system. The autosampler's needle transfers the sample to be analyzed into the GC-MS system. Before sample transfer, the positions of the needle and the GC inlet need to be adjusted to ensure that the autosampler needle does not collide with the GC inlet when transferring the sample.

[0004] However, currently, when adjusting the position of the injection needle and the gas chromatograph's injection port, technicians can only rely on their experience and visual judgment to determine whether the injection vibrator is centered at the injection port. This adjustment method, relying solely on manual judgment, is prone to deviations, leading to collisions between the injection needle and the corresponding structure of the injection port during subsequent use, thus increasing the risk of the injection needle bending or breaking. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a syringe positioning device, a gas chromatograph, and a gas chromatography-mass spectrometry system to solve the problem that in the prior art, the relative position of the syringe and the injection port can only be determined by visual inspection.

[0006] To achieve the above and other related objectives, this utility model provides a needle positioning device, including a positioner, a first injection port nut, and a positioning post. The positioner includes a cylindrical positioner body with a first positioning hole and a first clearance hole. A clearance channel formed by the first positioning hole and the first clearance hole for the injection needle to pass through extends through the positioner body. The diameter of the first positioning hole is larger than the diameter of the first clearance hole. The center of the first injection port nut has a first through hole for the injection needle to pass through and a first blind hole for accommodating the positioner body. The diameter of the first blind hole is larger than the diameter of the first through hole. The diameter of the first blind hole is greater than or equal to the outer diameter of the positioner body. The center of the positioning post has a second clearance hole for the injection needle to pass through. The outer diameter of the positioning post is less than or equal to the inner diameter of the first positioning hole.

[0007] Optionally, the diameter of the first blind hole is equal to the outer diameter of the locator body.

[0008] Optionally, the outer diameter of the positioning pin is equal to the inner diameter of the first positioning hole.

[0009] Optionally, the positioner body also includes a first conical hole, the first positioning hole being located between the first conical hole and the first clearance hole, and the small end of the first conical hole being connected to the first positioning hole.

[0010] Optionally, it also includes a second inlet nut and a septum. A limiting step is provided on the inner sidewall of the first through hole. The septum is disposed in the first through hole, and its bottom abuts against the limiting step. A second through hole communicating with the first through hole is provided at the center of the septum. A third through hole communicating with the first through hole is provided at the center of the second inlet nut. The second inlet nut is detachably connected to the first inlet nut and is used to limit the septum in the first through hole. The positioner body also includes a second positioning hole for accommodating the second inlet nut. A first clearance hole is located between the first positioning hole and the second positioning hole, and the diameter of the second positioning hole is larger than the diameter of the first clearance hole.

[0011] Optionally, a mounting post coaxial with the first through hole is provided at the center of the bottom of the first blind hole, and the first through hole passes through the mounting post; a second blind hole is provided at the center of the connection end between the second injection port nut and the first injection port nut, the second blind hole and the third through hole are connected, and the inner wall of the second blind hole is detachably connected to the outer wall of the mounting post.

[0012] Optionally, the inner wall of the second blind hole is threaded to the outer wall of the mounting post.

[0013] Optionally, a connecting post protrudes from the end of the second injection port nut away from the first injection port nut; a second conical hole communicating with the third through hole is provided at the center of the connecting post, and the small end of the second conical hole is communicating with the third through hole.

[0014] On the other hand, a gas chromatograph is also provided, including an autosampler and an injection needle positioning device as described above; the positioning column is disposed on the autosampler; the first injection port nut is disposed on the injection port of the gas chromatograph, and the first through hole is connected to the injection port.

[0015] On the other hand, a gas chromatography-mass spectrometry (GC-MS) instrument is also provided, including a mass spectrometer and a gas chromatograph as described above.

[0016] As described above, the injection needle positioning device, gas chromatograph, and gas chromatography-mass spectrometry system of this utility model have at least the following beneficial effects: the outer wall of the positioning device body is limited by the first blind hole set on the first injection port nut, the outer wall of the positioning column is limited by the inner wall of the first positioning hole, and the bottom of the first positioning hole and the bottom of the positioning column are limited. Thus, when adjusting the relative position of the injection needle and the injection port, it is only necessary to place the positioning device in the first blind hole and the positioning column in the first positioning hole to complete the adjustment work, avoiding deviations caused by relying solely on visual judgment, which could lead to collisions between the corresponding structures of the injection needle and the injection port. Attached Figure Description

[0017] Figure 1 The diagram shown is an overall structural schematic of a sample injection needle positioning device according to this utility model.

[0018] Figure 2 The diagram shown is an exploded view of a sample injection needle positioning device according to this utility model.

[0019] Figure 3 The diagram shown is a cross-sectional view of the positioner of a sample injection needle positioning device according to this utility model.

[0020] Figure 4 The diagram shown is a cross-sectional view of the second inlet nut of a sample injection needle positioning device according to this utility model.

[0021] Component designation explanation:

[0022] 1. Positioner; 11. First positioning hole; 12. First clearance hole; 13. First conical hole; 14. Second positioning hole; 2. First injection port nut; 21. First through hole; 22. First blind hole; 23. Limiting step; 24. Mounting post; 3. Positioning post; 31. Second clearance hole; 4. Second injection port nut; 41. Third through hole; 42. Second blind hole; 43. Connecting post; 44. Second conical hole; 5. Septum; 51. Second through hole. Detailed Implementation

[0023] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0024] Please refer to all the accompanying drawings below. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0025] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0026] Please see Figure 1-3 This utility model provides a sample injection needle positioning device, including a positioner 1, a first sample injection port nut 2, and a positioning post 3;

[0027] The positioner 1 includes a cylindrical positioner 1 body with a first positioning hole 11 and a first clearance hole 12; the first injection port nut 2, the positioner 1 body, and the positioner column 3 can be made of high-temperature resistant and corrosion-resistant materials, such as aluminum alloy. The clearance channel formed by the first positioning hole 11 and the first clearance hole 12 passes through the positioner 1 body; the diameter of the first positioning hole 11 is larger than the diameter of the first clearance hole 12; the center of the first injection port nut 2 has a first through hole 21 for the injection needle to pass through and a first blind hole 22 for accommodating the positioner 1 body; the diameter of the first blind hole 22 is larger than the diameter of the first through hole 21; the diameter of the first blind hole 22 is greater than or equal to the outer diameter of the positioner 1 body; the center of the positioner column 3 has a second clearance hole 31 for the injection needle to pass through; the outer diameter of the positioner column 3 is less than or equal to the inner diameter of the first positioning hole 11. The first through hole 21 allows the injection needle to pass through, so that the injection needle can deliver the sample into the gas chromatograph 20. It should be understood that the connection between the first injection port nut 2 and the relevant structure of the injection port of the gas chromatograph 20 can be a threaded connection or a snap-fit ​​structure, and this embodiment does not limit this.

[0028] Preferably, the diameter of the first blind hole 22 is equal to the outer diameter of the locator 1 body, so that the inner sidewall of the first blind hole 22 abuts against the outer sidewall of the locator 1 body, thereby limiting the relative displacement between the two.

[0029] Please see Figure 2-4The injection needle positioning device provided in this embodiment also includes a second injection port nut 4 and a septum 5. A limiting step 23 is provided on the inner side wall of the first through hole 21. The septum 5 can be a flexible structure made of rubber or other materials. It is set in the first through hole 21 and its bottom abuts against the limiting step 23. A second through hole 51 communicating with the first through hole 21 is provided at the center of the septum 5. The second injection port nut 4 can be made of high temperature resistant and corrosion resistant materials, such as aluminum alloy. A third through hole 41 communicating with the first through hole 21 is provided at its center; the second inlet nut 4 is detachably connected to the first inlet nut 2. After the second inlet nut 4 is installed on the first inlet nut 2, the first through hole 21, the second through hole 51 and the third through hole 41 are coaxially arranged, and one end of the second inlet nut 4 abuts against the top of the septum 5 to limit the septum 5 in the first through hole 21; the positioner 1 body also includes a second positioning hole 14 for accommodating the second inlet nut 4, and a first clearance hole 12 is located between the first positioning hole 11 and the second positioning hole 14. The first clearance hole 12, the first positioning hole 11 and the second positioning hole 14 are connected, and the diameter of the second positioning hole 14 is larger than the diameter of the first clearance hole 12.

[0030] A mounting post 24, coaxial with the first through hole 21, is provided at the center of the bottom of the first blind hole 22, and the first through hole 21 passes through the mounting post 24; a second blind hole 42 is provided at the center of the connection end between the second injection port nut 4 and the first injection port nut 2, and the second blind hole 42 communicates with the third through hole 41. The inner wall of the second blind hole 42 is detachably connected to the outer wall of the mounting post 24. The inner wall of the second blind hole 42 and the outer wall of the mounting post 24 can be connected by a detachable structure such as a snap-fit. In this embodiment, the inner wall of the second blind hole 42 is provided with an internal thread, and the outer wall of the mounting post 24 can be provided with an external thread to achieve a threaded connection for easy disassembly.

[0031] A connecting post 43 protrudes from the end of the second injection port nut 4 away from the first injection port nut 2. A second tapered hole 44, communicating with the third through hole 41, is located at the center of the connecting post 43. The smaller end of the second tapered hole 44 communicates with the third through hole 41. The second tapered hole 44 enlarges the diameter of the third through hole 41 and guides the injection needle using its inclined sidewall, preventing the injection needle from breaking. It can be understood that after the second injection port nut 4 is installed on the first injection port nut 2, the second tapered hole 44, the third through hole 41, the second through hole 51, and the first through hole 21 are coaxially arranged, forming an injection channel for the injection needle to pass through.

[0032] After the second inlet nut 4 and the locator 1 are installed onto the first inlet nut 2, the end of the connecting post 43 away from the first inlet can extend into the first positioning hole 11. At this time, the end of the connecting post 43 away from the first inlet abuts against the end of the positioning post 3 to increase the contact area of ​​the end of the positioning post 3. More preferably, the end of the connecting post 43 away from the first inlet is flush with the bottom of the first positioning hole 11. At this time, the end of the connecting post 43, the positioning post 3, and the bottom of the first positioning hole 11 are all in abutment, further increasing the contact area of ​​the positioning post 3 and ensuring that the positioning post 3 will not move radially relative to the locator 1.

[0033] The second inlet nut 4 also includes a connecting section located between the outer wall of the second blind hole 42 and the connecting post 43. The first through hole 21 passes through the connecting section, and the diameter of the connecting section is larger than the outer diameter of the first through hole 21 and the connecting post 43. Its outer wall is provided with a structure for easy hand tightening. The diameter of the second positioning hole 14 is larger than the outer diameter of the second inlet nut 4, that is, larger than the outer diameter of the connecting section. The depth of the second positioning hole 14 can be greater than the distance from the end of the connecting section away from the first blind hole 22 to the bottom of the first blind hole 22 after the second inlet nut 4 is installed on the first inlet nut 2, thereby ensuring that the second positioning hole 14 can accommodate the second inlet nut 4. It also ensures that the connecting post 43 can pass through the clearance opening and be located in the second clearance hole 31 of the locator 1 body.

[0034] On the other hand, this utility model also provides a gas chromatograph, which includes an autosampler and a needle positioning device as described above. The autosampler is used to transfer the sample to be tested into the gas chromatograph. The autosampler may include a transfer mechanism, which can realize X, Y, and Z axis movement. The end of the transfer mechanism may be provided with a needle, a connecting rod, a connecting column, and a drive mechanism. The drive mechanism is disposed on the connecting rod, and the needle is disposed on the drive mechanism. The drive mechanism can be a belt drive mechanism or a screw drive mechanism, etc. This embodiment does not limit this. The drive mechanism is used to drive the needle to move along the axial direction of the connecting rod. The positioning column 3 is disposed at the end of the connecting rod, and the outer diameter of the positioning column 3 is less than or equal to the inner diameter of the first positioning hole 11. In use, the second clearance hole 31 and the first through hole 21, the second through hole 51 and the third through hole 41 are coaxially arranged. Preferably, the outer diameter of the positioning column 3 is equal to the inner diameter of the first positioning hole 11, and the diameter of the first blind hole 22 is equal to the outer diameter of the body of the positioner 1. In this way, during use, the positioning column 3 can be inserted into the first positioning hole 11 of the positioner 1. The positioning column 3 is limited by the inner wall and bottom of the first positioning hole 11. The automatic sampler is limited by the inner wall of the first blind hole 22 of the first injection port nut 2 and the outer wall of the positioner 1 body. As long as the injection needle can be inserted into the first clearance hole 12, it can be ensured that the injection needle can enter the injection port of the gas chromatograph, avoiding collision between the injection needle and the corresponding structure of the injection port.

[0035] Furthermore, a gas chromatography-mass spectrometry (GC-MS) instrument is also provided, comprising a mass spectrometer and the aforementioned gas chromatograph. An autosampler can also transfer samples to be detected into the mass spectrometer; this embodiment does not limit this capability.

[0036] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0037] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A sample introduction needle positioning device, characterized by: Includes a positioner, a first injection port nut, and a positioning post; The positioner includes a cylindrical positioner body having a first positioning hole and a first clearance hole; the clearance channel formed by the first positioning hole and the first clearance hole for the injection needle to pass through extends through the positioner body; the diameter of the first positioning hole is larger than the diameter of the first clearance hole. The first inlet nut has a first through hole for the injection needle to pass through and a first blind hole for accommodating the positioner body at its center; the diameter of the first blind hole is larger than the diameter of the first through hole; the diameter of the first blind hole is greater than or equal to the outer diameter of the positioner body. The positioning post has a second clearance hole at its center for the injection needle to pass through; the outer diameter of the positioning post is less than or equal to the inner diameter of the first positioning hole.

2. A sample injector positioning device according to claim 1, characterized in that: The diameter of the first blind hole is equal to the outer diameter of the locator body.

3. A sample injector positioning device according to claim 2, wherein: The outer diameter of the positioning post is equal to the inner diameter of the first positioning hole.

4. A sample injector positioning device according to any one of claims 1 to 3, wherein: The locator body also includes a first conical hole, which is located between the first conical hole and the first clearance hole, and the small end of the first conical hole is connected to the first positioning hole.

5. A sample injector positioning device according to claim 4, wherein: It also includes a second inlet nut and septum. A limiting step is provided on the inner sidewall of the first through hole, and the spacer is placed inside the first through hole with its bottom abutting against the limiting step; a second through hole communicating with the first through hole is provided at the center of the spacer. The second inlet nut has a third through hole at its center that communicates with the first through hole; the second inlet nut is detachably connected to the first inlet nut and is used to limit the septum within the first through hole. The positioner body also includes a second positioning hole for accommodating the second inlet nut, the first clearance hole is located between the first positioning hole and the second positioning hole, and the diameter of the second positioning hole is larger than the diameter of the first clearance hole.

6. A sample introduction needle positioning device according to claim 5, wherein: A mounting post coaxial with the first through hole is provided at the center of the bottom of the first blind hole, and the first through hole passes through the mounting post; A second blind hole is provided at the center of the connection end between the second injection port nut and the first injection port nut. The second blind hole communicates with the third through hole, and the inner wall of the second blind hole is detachably connected to the outer wall of the mounting column.

7. A sample injector positioning device according to claim 6, wherein: The inner wall of the second blind hole is threadedly connected to the outer wall of the mounting post.

8. A sample introduction needle positioning device according to claim 6, wherein: A connecting post protrudes from the end of the second inlet nut away from the first inlet nut; The center of the connecting column is provided with a second conical hole that communicates with the third through hole, and the small end of the second conical hole communicates with the third through hole.

9. A gas chromatograph characterized by, Includes an autosampler and a needle positioning device as described in any one of claims 1-8; The positioning column is disposed on the autosampler; the first injection port nut is disposed on the injection port of the gas chromatograph, and the first through hole is connected to the injection port.

10. A gas chromatograph-mass spectrometer comprising, Includes a mass spectrometer and a gas chromatograph as described in claim 9.

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