A gas chromatograph with convenient sample injection

Abstract

The utility model discloses a gas chromatograph convenient to sample, including chromatograph, sampling needle and sampler, the sampling port of chromatograph is equipped with the scale line for the installation sampler of alignment, and the sampler is used to assist the use sampling needle, and the sampler includes the pressing plate and the bottom plate, and the pressing plate is equipped with the limiting component for installing sampling needle, and the bottom plate is equipped with the locating cylinder for guiding when sampling needle stabs into the sampling port, and the pressing plate is equipped with the elastic component for the elastic component of sampling needle pulling out the sampling port of counter -thrust between the bottom plate. The utility model discloses through the sampler to assist the use sampling needle, not only can maintain sampling needle stab into the sampling port of gas chromatograph, the vertical state of its needle head, and further guarantee the smooth and convenient of sampling process, and after sampling is completed, still can through the elastic force of elastic component to counter -thrust sampling needle to pull it away from the sampling port in time to the needle head stagnation possibly caused sample diffusion is avoided.

Description

Technical Field

[0001] This utility model relates to the field of gas chromatograph sample introduction technology, and in particular to a gas chromatograph with convenient sample introduction. Background Technology

[0002] Gas chromatography is an instrument that uses chromatographic separation and detection techniques to perform qualitative and quantitative analysis of complex mixtures of multiple components. It is typically used to analyze thermally stable organic compounds in soil with boiling points not exceeding 500 degrees Celsius, such as volatile organic compounds, organochlorines, organophosphorus compounds, polycyclic aromatic hydrocarbons, and phthalates.

[0003] The injection process in a gas chromatograph is crucial to the accuracy, reproducibility, and sensitivity of analytical results. However, some users, for cost reasons, do not equip their gas chromatographs with an autosampler and instead use manual injection. Manual injection, however, is subject to the operator's skill level and is prone to error. For example, the sample needle (syringe) may bend due to the insertion angle and visual errors, leading to poor injection. This is especially true if the injection port screw is tightened too much, as the needle may expand due to increased room temperature, making it difficult to insert smoothly. Furthermore, inaccurate alignment may damage the needle by piercing a metal part near the injection port, further complicating the injection process.

[0004] A search revealed that Chinese utility model patent CN204989121U discloses a gas chromatograph injector, comprising an injector body and a retainer. The retainer is fixed to one end face of the injector body, and a suction cup device is provided on the retainer. Three suction cup bodies arranged in a triangle are located at one end of the suction cup device, and a vacuum pressure valve is connected to each suction cup body. The vacuum pressure valve is built into the suction cup device. A push rod is provided at the rear end of the injector body, and a needle is connected to the push rod. This application uses suction cups to fix the injector to the gas chromatograph, making the injection process more stable. However, to avoid the needle tip lingering at the injection port and causing sample diffusion, gas chromatograph injection often requires rapid insertion, injection, and withdrawal. This device, after fixing the injector, makes it difficult to withdraw it quickly, thus causing inconvenience in the injection process. Utility Model Content

[0005] In view of the above-mentioned prior art, the present invention provides a gas chromatograph with convenient sample injection, and the main technical problem to be solved is how to facilitate sample injection in a gas chromatograph.

[0006] To achieve the above objectives, the technical solution of this utility model embodiment is implemented as follows:

[0007] A gas chromatograph with convenient sample injection includes a chromatograph, an injection needle, and an injector. The injection port of the chromatograph is provided with a mark for aligning and installing the injector. The injector is used to assist in the use of the injection needle. The injector includes a pressure plate and a base plate. The pressure plate is provided with a limiting component for installing the injection needle. The base plate is provided with a positioning cylinder for guiding the injection needle when it is inserted into the injection port. An elastic component is provided between the pressure plate and the base plate for reversing the injection needle and pulling it out of the injection port.

[0008] Furthermore, the elastic component includes several positioning rods and guide cylinders, with the number of positioning rods and guide cylinders being the same and corresponding one-to-one.

[0009] Furthermore, the guide cylinder is sleeved outside the top end of the positioning rod, and a spring is fixedly connected between the top end of the positioning rod and the inner wall of the top end of the guide cylinder.

[0010] Furthermore, a circular opening adapted to the syringe barrel of the injection needle is provided in the middle of the pressure plate, and several guide tubes are fixedly connected at equal intervals to the outer side of the bottom end of the pressure plate.

[0011] Furthermore, a circular through hole is provided in the middle of the base plate, the positioning cylinder is fixedly connected to the base plate at the circular through hole, and several positioning rods are fixedly connected at equal intervals to the outer top of the base plate.

[0012] Furthermore, a support plate is fixedly connected to the bottom of several guide tubes. A through groove is opened in the middle of the plate body, and the diameter of the through groove is smaller than the diameter of the syringe of the injection needle.

[0013] Furthermore, the limiting assembly includes several connecting rods rotatably connected to the outer side of the top of the pressure plate, with a pressure plate fixedly connected to the top of the connecting rod, and a torsion spring fixedly connected between the connecting rod and the pressure plate.

[0014] Furthermore, several suction cups are fixedly connected at equal intervals on the outer bottom end of the base plate, and the base plate is adapted to the marking line.

[0015] Furthermore, the pressure plate has several rubber protrusions fixedly connected at equal intervals at the circular opening.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. This device assists the use of the injection needle through the injector. It not only maintains the vertical position of the injection needle when it is inserted into the injection port of the gas chromatograph, thus ensuring a smooth and convenient injection process, but also allows the injection needle to be pushed back by the elastic force of the elastic component after the injection is completed, so as to pull it out of the injection port in time, thereby avoiding sample diffusion that may be caused by needle retention. In addition, the positioning cylinder can always provide support during the needle's entry and exit from the injection port to prevent the needle from bending and causing injection obstruction. Therefore, this device can facilitate the injection operation of the gas chromatograph.

[0018] 2. By installing a suction cup under the base plate, the injector can be fixed to the cover plate outside the gas chromatograph injection port, so as to ensure that the injector and the injection port are in a relatively static state. Then, the injection needle can be operated with the injector, which can ensure the stability and smoothness of the injection process.

[0019] 3. By setting several rubber protrusions on the inner side of the pressure plate, the protrusions can not only further limit the injection needle, but also provide a padding effect, thus ensuring the stability and safety of the injection needle, and further facilitating the injection operation of the gas chromatograph. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a gas chromatograph with convenient sample injection according to Embodiment 1 of this application;

[0021] Figure 2 This is a schematic diagram of the structure of a gas chromatograph with convenient sample injection according to Embodiment 1 of this application;

[0022] Figure 3 This is a schematic diagram of the structure of a gas chromatograph with convenient sample injection according to Embodiment 1 of this application;

[0023] Figure 4 This is a schematic diagram of the structure of a gas chromatograph with convenient sample injection according to Embodiment 1 of this application;

[0024] Figure 5 This is a schematic diagram of the structure of a gas chromatograph with convenient sample introduction according to Embodiment 2 of this application.

[0025] Explanation of icon numbers:

[0026] 1. Chromatograph 2. Injector 3. Pressure plate 301. Base plate 302. Marking 4. Positioning cylinder 5. Positioning rod 6. Support plate 7. Guide cylinder 8. Pressure plate 9. Connecting rod 10. Torsion spring 11. Spring 12. Suction cup 13. Protrusion 14. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the utility model.

[0028] Example 1

[0029] See attached document Figure 1-4This application provides a gas chromatograph with convenient sample injection, including a chromatograph 1, an injection needle 2, and an injector 3. The injection port of the chromatograph 1 is provided with a mark 4 for aligning and installing the injector 3. The injector 3 is used to assist in the use of the injection needle 2. The injector 3 includes a pressure plate 301 and a base plate 302. The pressure plate 301 is provided with a limiting component for installing the injection needle 2. The base plate 302 is provided with a positioning cylinder 5 for guiding the injection needle 2 when it is inserted into the injection port. An elastic component is provided between the pressure plate 301 and the base plate 302 for pushing the injection needle 2 out of the injection port.

[0030] Preferably, a number of suction cups 13 are fixedly connected at equal intervals on the outer side of the bottom end of the base plate 302, and the base plate 302 is compatible with the marking line 4.

[0031] When using a gas chromatograph, the injector 3 can be placed at the injection port of the chromatograph 1, and the base plate 302 can be positioned according to the mark 4 so that the positioning cylinder 5 and the injection port are on the same axis. Then, press the base plate 302, and the injector 3 can be fixed by the suction cup 13.

[0032] Preferably, the limiting assembly includes several connecting rods 10 rotatably connected to the outer side of the top end of the pressure plate 301. A pressure plate 9 is fixedly connected to the top end of each connecting rod 10, and a torsion spring 11 is fixedly connected between the connecting rod 10 and the pressure plate 301. The pressure plate 9 is fan-shaped, and multiple pressure plates 9 can be combined to form an annular plate-like component, which can be used to push the injection needle 2 downward.

[0033] Preferably, a support plate 7 is fixedly connected to the bottom of several guide cylinders 8. A through groove is opened in the middle of the plate body of the support plate 7. The diameter of the through groove is smaller than the diameter of the syringe of the injection needle 2, and the diameter of the through groove is larger than the diameter of the needle tip of the injection needle 2. Therefore, it can ensure that the needle tip can pass through, while the syringe will abut against its top. In this way, the support plate 7 supports the syringe so that it can be pushed upward after the injection needle finishes injecting the sample, ensuring that the needle tip can be quickly pulled out from the injection port of the chromatograph 1.

[0034] Then, after turning the two connecting rods 10 outward to separate the two pressure plates 9, the injection needle 2 can be inserted from the inside of the pressure plate 301 until the syringe of the injection needle 2 is against the support plate 7 and the needle tip is inserted into the positioning cylinder 5. After that, the connecting rods 10 can be released, and the elastic force of the torsion spring 11 can be used to turn the connecting rods 10 in the opposite direction to return to their original state. Therefore, the two pressure plates 9 can be used to cover the injection needle 2.

[0035] After the injection needle 2 is installed, the pressure plate 301 can be pressed down while holding the connecting rod 10. The connecting rod 10 can then press the injection needle 2 through the pressure plate 9, causing the needle tip to pass through the positioning cylinder 5 and be inserted into the injection port. After that, the injection needle 2 can be operated to push the gas sample into the chromatograph 1.

[0036] Preferably, the elastic component includes a plurality of positioning rods 6 and guide cylinders 8, wherein the number of positioning rods 6 and guide cylinders 8 are the same and correspond one-to-one.

[0037] Preferably, the guide cylinder 8 is sleeved on the outside of the top end of the positioning rod 6, and a spring 12 is fixedly connected between the top end of the positioning rod 6 and the inner wall of the top end of the guide cylinder 8. The spring 12 is a compression spring.

[0038] After the injection is completed, the connecting rod 10 can be released. At this time, the spring 12 can push the guide cylinder 8 to rise through its own elasticity. The guide cylinder 8 can then lift the injection needle 2 through the support plate 7, so that the needle tip can be pulled out of the injection port in time. Then the chromatograph 1 can be started to analyze the gas sample.

[0039] Preferably, a circular opening adapted to the syringe of the injection needle 2 is provided in the middle of the plate body of the pressure plate 301, and several guide cylinders 8 are fixedly connected at equal intervals to the outer side of the bottom end of the pressure plate 301.

[0040] Preferably, a circular through hole is provided in the middle of the base plate 302, the positioning cylinder 5 is fixedly connected to the base plate 302 at the circular through hole, and several positioning rods 6 are fixedly connected at equal intervals to the outer side of the top of the base plate 302.

[0041] During the pressing and lowering and pushing upward processes of the injection needle 2, the positioning rod 6 and guide cylinder 8 can play a guiding role, so that the lifting and lowering process of the injection needle 2 can be carried out in the vertical direction, thereby ensuring the vertical lifting and lowering of its needle tip. In addition, during the process of the needle tip entering and exiting the injection port of the chromatograph 1, the positioning cylinder 5 can always provide guidance and support for the needle tip, thereby preventing it from bending and causing poor injection.

[0042] Example 2

[0043] See attached document Figure 5 This application provides a gas chromatograph with convenient sample injection. Compared with Example 1, in order to further facilitate the sample injection operation of the gas chromatograph, the pressure plate 301 has several rubber protrusions 14 fixedly connected at equal intervals at the circular opening.

[0044] When the injection needle 2 is inserted through the pressure plate 301 and installed onto the injector 3, the protrusion 14 of the rubber material can not only further limit the injection needle 2, but also provide a padding effect, thus further facilitating the injection operation of the gas chromatograph.

[0045] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. The protection scope of this utility model shall be determined by the protection scope of the claims.

Claims

1. A gas chromatograph with convenient sample injection, comprising a chromatograph (1), an injection needle (2), and an injector (3), characterized in that, The chromatograph (1) has a marking (4) at the injection port for aligning and installing the injector (3). The injector (3) is used to assist in the use of the injection needle (2). The injector (3) includes a pressure plate (301) and a base plate (302). The pressure plate (301) is provided with a limiting component for installing the injection needle (2). The base plate (302) is provided with a positioning cylinder (5) for guiding the injection needle (2) when it is inserted into the injection port. An elastic component is provided between the pressure plate (301) and the base plate (302) for pushing the injection needle (2) out of the injection port.

2. The gas chromatograph with convenient sample introduction according to claim 1, characterized in that, The elastic component includes several positioning rods (6) and guide cylinders (8), and the number of positioning rods (6) and guide cylinders (8) are the same and correspond one-to-one.

3. A gas chromatograph with convenient sample introduction according to claim 2, characterized in that, The guide cylinder (8) is sleeved on the outside of the top end of the positioning rod (6), and a spring (12) is fixedly connected between the top end of the positioning rod (6) and the inner wall of the top end of the guide cylinder (8).

4. A gas chromatograph with convenient sample introduction according to claim 2, characterized in that, The pressure plate (301) has a circular opening in the middle of the plate body that is compatible with the syringe of the injection needle (2), and several guide cylinders (8) are fixedly connected at equal intervals to the outer side of the bottom end of the pressure plate (301).

5. A gas chromatograph with convenient sample introduction according to claim 2, characterized in that, A circular through hole is provided in the middle of the base plate (302), and the positioning cylinder (5) is fixedly connected to the base plate (302) at the circular through hole. Several positioning rods (6) are fixedly connected at equal intervals to the outer side of the top of the base plate (302).

6. A gas chromatograph with convenient sample introduction according to claim 2, characterized in that, A support plate (7) is fixedly connected to the bottom of several guide cylinders (8). A through groove is provided in the middle of the plate body of the support plate (7). The diameter of the through groove is smaller than the diameter of the syringe of the injection needle (2).

7. A gas chromatograph with convenient sample introduction according to claim 1, characterized in that, The limiting assembly includes several connecting rods (10) rotatably connected to the outer side of the top of the pressure plate (301). A pressure plate (9) is fixedly connected to the top of each connecting rod (10). A torsion spring (11) is fixedly connected between the connecting rod (10) and the pressure plate (301).

8. A gas chromatograph with convenient sample introduction according to claim 1, characterized in that, Several suction cups (13) are fixedly connected at equal intervals on the outer side of the bottom end of the base plate (302), and the base plate (302) is adapted to the marking line (4).

9. A gas chromatograph with convenient sample introduction according to claim 4, characterized in that, The pressure plate (301) has several rubber material protrusions (14) fixedly connected at equal intervals at the circular opening.

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