Sample gas injection device of gas chromatograph

Abstract

The utility model discloses a gas chromatograph sample gas sampling device which comprises a gas chromatograph body, a box body is arranged at the top of the gas chromatograph body, an opening and closing assembly is arranged at the top of the box body, a quantitative sampling mechanism is arranged in the box body, and the quantitative sampling mechanism comprises a sampling assembly, a gas inlet assembly and a gas outlet assembly, comprising a filter box and a quantitative tank which are arranged on the inner wall of a box body, and the top of the filter box is fixedly connected with a sample injection pipe. According to the sample gas injection device of the gas chromatograph, the quantitative sample injection mechanism is arranged, the heights of a linkage plate, a sliding rod, a piston, a quantitative plate and a pointer are flexibly adjusted under the driving of a driving motor, and the gas inlet amount of sample gas extracted by a quantitative tank at a time can be intuitively known by matching the pointer with a scale plate; therefore, the quantitative sample injection effect is achieved, and the subsequent gas detection quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of gas chromatography technology, specifically to a sample gas injection device for a gas chromatograph. Background Technology

[0002] The reference patent, titled "Sample Gas Injection Device for Gas Chromatograph" (Authorization Announcement No.: CN22156823U, Authorization Announcement Date: 2024.08.09), includes an assembly base, multiple connecting arms, an assembly top, a gas chromatograph body, multiple gas canister placement assemblies, gas canisters, and a gas delivery assembly. One end of each connecting arm is circumferentially arrayed on the assembly base, and the bottom of the assembly top is fixedly connected to the other end of each connecting arm. The gas chromatograph body is mounted on the assembly base, and the multiple gas canister placement assemblies are circumferentially arrayed on the assembly top. The gas canisters are installed within the gas canister placement assemblies and are connected to the gas chromatograph body via the gas delivery assembly. This allows for the categorized storage of gases by setting up multiple gas canisters. Furthermore, the heating parameters can be adjusted according to the different stored gases, effectively improving practicality. The gas delivery assembly also facilitates the switching and delivery of different analyte gases, effectively improving detection efficiency.

[0003] Based on the above-mentioned document: When existing gas chromatographs detect sample gases, they generally deliver the sample gas into the gas chromatograph through a gas pump or by hand-held injection. This method cannot achieve precise control of the sample gas intake volume for each test. Therefore, in laboratories that need to perform multiple tests, errors in the sample gas intake volume can easily affect the final test results. To address this, the present invention provides a sample gas injection device for a gas chromatograph. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a sample gas injection device for a gas chromatograph, which solves the problem that existing sample gas injection devices for gas chromatographs cannot achieve precise control of the amount of sample gas injected each time.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a gas chromatograph sample gas injection device, comprising a gas chromatograph body, a housing on the top of the gas chromatograph body, an opening and closing assembly on the top of the housing, and a quantitative injection mechanism inside the housing, the quantitative injection mechanism comprising:

[0006] The sample injection assembly includes a filter box and a quantitative container installed on the inner wall of the chamber. The top of the filter box is fixedly connected to the sample injection tube. One side of the quantitative container is fixedly connected to the bottom of the quantitative container through a connecting tube. The bottom of the quantitative container is fixedly connected to the top of the gas chromatograph body through an air inlet tube. One-way valves are installed on the surface of the air inlet tube and the surface of the connecting tube. A piston is slidably connected inside the quantitative container. A sliding rod is fixedly connected to the top of the piston. The surface of the sliding rod is slidably connected to the inside of the chamber.

[0007] A metering component is disposed on the surface of the sliding rod;

[0008] The linkage component is located at the top of the sliding rod;

[0009] The drive assembly is located at the top of the enclosure.

[0010] Preferably, the metering component includes a metering plate mounted on the surface of a sliding rod and a scale plate mounted on one side of the housing. The surface of the metering plate is slidably connected to the interior of the housing, and a pointer is fixedly connected to one end of the metering plate.

[0011] Preferably, the linkage assembly includes a linkage block installed at the top of the sliding rod, a linkage plate is fixedly connected to one side of the linkage block, and a linkage groove is formed on the surface of the linkage plate.

[0012] Preferably, the drive assembly includes a fixed plate mounted on the top of the housing, a drive motor fixedly connected to the rear side of the fixed plate, a drive disk fixedly connected to one end of the output shaft of the drive motor via a coupling, a drive block fixedly connected to one side of the drive disk, and the surface of the drive block slidably connected to the inner surface of the linkage groove.

[0013] Preferably, the opening and closing assembly includes a limiting plate installed on the top of the housing. A sliding toothed plate is slidably connected inside the limiting plate. A limiting spring is fixedly connected to one side of the sliding toothed plate, and one end of the limiting spring is fixedly connected to the inner wall of the limiting plate. Control blocks are fixedly connected to both sides of the sliding toothed plate. The surface of the control blocks is slidably connected to the inside of the limiting plate. A pressure block is slidably connected inside the limiting plate. A return spring is installed on the surface of the pressure block, and one end of the return spring is fixedly connected to the inner wall of the limiting plate. A locking block is slidably connected inside the sliding toothed plate. The bottom end of the locking block is fixedly connected to the bottom of the inner cavity of the sliding toothed plate through a locking spring. A locking groove is formed at the top of the inner cavity of the sliding toothed plate. The inner surface of the locking groove engages with the surface of the locking block. The top of the sliding toothed plate rotates the opening and closing plate through a transmission assembly, and the surface of the opening and closing plate is in contact with the inner surface of the sample inlet tube.

[0014] Preferably, the transmission assembly includes a transmission rod rotatably mounted inside the sample inlet tube, one end of the transmission rod being fixedly connected to the interior of the opening and closing plate, and the other end of the transmission rod being fixedly connected to a transmission gear, the surface of which meshes with the top of the sliding tooth plate.

[0015] Beneficial effects

[0016] This invention provides a sample gas injection device for a gas chromatograph. Compared with the prior art, it has the following advantages:

[0017] 1. This gas chromatograph sample gas injection device, by starting the drive motor, drives the drive disk and drive block to rotate, causing the drive block to slide on the inner surface of the linkage groove. This, in turn, causes the linkage plate, sliding rod, and piston to slide upward synchronously. At this time, the gas pressure inside the quantitative tank changes, thereby extracting the gas to be detected from the gas storage tank through the connecting pipe, filter box, and injection pipe. The gas to be detected is filtered through the coarse filter element, fine filter element, and adsorption filter element in the filter box. Simultaneously, when the sliding rod slides, it drives the quantitative plate and pointer to slide synchronously. By observing the pointer and scale, the amount of gas to be detected entering the quantitative tank can be intuitively understood. By setting up a quantitative injection mechanism, driven by the drive motor, the height of the linkage plate, sliding rod, piston, quantitative plate, and pointer can be flexibly adjusted. Using the pointer in conjunction with the scale, the amount of sample gas extracted by the quantitative tank in a single operation can be intuitively understood, thereby achieving the effect of quantitative injection and improving the quality of subsequent gas detection.

[0018] 2. The sample gas injection device of this gas chromatograph uses a control block to drive a sliding toothed plate to slide inside a limiting plate. The sliding of the toothed plate causes the transmission gear, transmission rod, and opening / closing plate to rotate synchronously, thereby connecting the gas storage tank, injection tube, and filter box. When the toothed plate slides, the limiting spring is compressed, and the sliding of the toothed plate causes the locking block to move synchronously, allowing the locking block to slide into the locking groove. Under the influence of the elasticity of the locking spring, the locking block remains locked to the inner surface of the locking groove, thus keeping the opening / closing plate in an open / closed state. By setting up the opening / closing component, the injection tube can be freely opened and closed. When changing the gas storage tank, closing the injection tube can prevent the filter box from contacting external gas. After the gas storage tank is replaced, the injection tube can be quickly opened to connect the gas storage tank and the filter box, making the operation convenient. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the external structure of this utility model;

[0020] Figure 2 This is a three-dimensional structural diagram of the box body of this utility model;

[0021] Figure 3 This is a three-dimensional schematic diagram of the drive component of this utility model;

[0022] Figure 4 This is a cross-sectional view of the internal structure of the sample inlet tube of this utility model.

[0023] In the diagram: 1-Gas chromatograph body, 2-Box, 3-Opening and closing assembly, 31-Limiting plate, 32-Sliding toothed plate, 33-Limiting spring, 34-Control block, 35-Pressure block, 36-Reset spring, 37-Snap-fit ​​block, 38-Snap-fit ​​spring, 39-Snap-fit ​​groove, 310-Opening and closing plate, 4-Quantitative injection mechanism, 41-Injection assembly, 411-Filter box, 412-Quantitative container, 413-Injection tube, 414-Connecting tube, 415- Intake pipe, 416-One-way valve, 417-Piston, 418-Sliding rod, 42-Metering component, 421-Metering plate, 422-Scale plate, 423-Pointer, 43-Linkage component, 431-Linkage block, 432-Linkage plate, 433-Linkage groove, 44-Drive component, 441-Fixed plate, 442-Drive motor, 443-Drive disc, 444-Drive block, 5-Transmission component, 51-Transmission rod, 52-Transmission gear. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-4 This utility model provides a technical solution:

[0026] A gas chromatograph sample gas injection device includes a gas chromatograph body 1, a housing 2 on the top of the gas chromatograph body 1, an opening and closing assembly 3 on the top of the housing 2, and a quantitative injection mechanism 4 inside the housing 2. The quantitative injection mechanism 4 includes:

[0027] The sample injection assembly 41 includes a filter box 411 and a quantitative container 412 installed on the inner wall of the housing 2. The top of the filter box 411 is fixedly connected to the sample injection tube 413. One side of the quantitative container 412 is fixedly connected to the bottom of the quantitative container 412 through a connecting tube 414. The bottom of the quantitative container 412 is fixedly connected to the top of the gas chromatograph body 1 through an air inlet tube 415. One-way valves 416 are installed on the surface of the air inlet tube 415 and the surface of the connecting tube 414. A piston 417 is slidably connected inside the quantitative container 412. A sliding rod 418 is fixedly connected to the top of the piston 417. The surface of the sliding rod 418 is slidably connected to the inside of the housing 2.

[0028] The metering component 42 is disposed on the surface of the sliding rod 418;

[0029] Linkage component 43 is located at the top of sliding rod 418;

[0030] The drive assembly 44 is located on the top of the housing 2.

[0031] A gas chromatograph is a chromatographic analysis instrument that uses gas as the mobile phase. It is mainly used to analyze and separate the components in a mixture.

[0032] One end of the sample inlet tube 413 is connected to a gas storage tank;

[0033] The inner wall of the filter chamber 411 is equipped with coarse filter elements, fine filter elements, and adsorption filter elements from top to bottom. Using the coarse filter elements: First, the sample gas passes through a coarse filter element, such as a 40-50 μm filter membrane, to remove larger particles. Next, the gas passes through a fine filter element, which can be a 0.3-0.5 μm filter membrane or an ultrafine glass fiber filter membrane, to further remove fine particles. Then, the gas enters the adsorption filter element, which is filled with an adsorbent, such as 13X air separation molecular sieve, to remove harmful gases and moisture.

[0034] In this embodiment, the quantitative component 42 includes a quantitative plate 421 mounted on the surface of the sliding rod 418 and a scale plate 422 mounted on one side of the box 2. The surface of the quantitative plate 421 is slidably connected to the inside of the box 2, and a pointer 423 is fixedly connected to one end of the quantitative plate 421.

[0035] A groove is provided on one side of the housing 2, and the metering plate 421 slides on the inner surface of the groove; the pointer 423 is in contact with the surface of the scale plate 422.

[0036] In this embodiment, the linkage component 43 includes a linkage block 431 installed at the top of the sliding rod 418. A linkage plate 432 is fixedly connected to one side of the linkage block 431, and a linkage groove 433 is provided on the surface of the linkage plate 432.

[0037] In this embodiment, the drive assembly 44 includes a fixing plate 441 installed on the top of the housing 2. A drive motor 442 is fixedly connected to the rear side of the fixing plate 441. One end of the output shaft of the drive motor 442 is fixedly connected to a drive disk 443 through a coupling. A drive block 444 is fixedly connected to one side of the drive disk 443. The surface of the drive block 444 is slidably connected to the inner surface of the linkage groove 433.

[0038] The drive motor 442 is a three-phase asynchronous motor and is connected to an external circuit via wires.

[0039] By starting the drive motor 442, the drive disc 443 and drive block 444 are driven to rotate, causing the drive block 444 to slide on the inner surface of the linkage groove 433. This causes the linkage plate 432, sliding rod 418, and piston 417 to slide upwards synchronously. At this time, the gas pressure inside the metering tank 412 changes, thereby extracting the gas to be tested from the gas storage tank through the connecting pipe 414, filter box 411, and sample inlet pipe 413. The gas to be tested is filtered through the coarse filter element, fine filter element, and adsorption filter element in the filter box 411. Simultaneously, when the sliding rod 418 slides... This will cause the quantitative plate 421 and pointer 423 to slide synchronously. By observing the pointer 423 and the scale plate 422, the amount of gas to be detected in the quantitative container 412 can be intuitively understood. With the quantitative injection mechanism 4, the height of the linkage plate 432, sliding rod 418, piston 417, quantitative plate 421 and pointer 423 can be flexibly adjusted under the drive of the drive motor 442. By using the pointer 423 in conjunction with the scale plate 422, the amount of sample gas extracted by the quantitative container 412 in a single operation can be intuitively understood, thereby achieving the effect of quantitative injection and improving the quality of subsequent gas detection.

[0040] In this embodiment, the opening and closing assembly 3 includes a limiting plate 31 installed on the top of the housing 2. A sliding toothed plate 32 is slidably connected inside the limiting plate 31. A limiting spring 33 is fixedly connected to one side of the sliding toothed plate 32. One end of the limiting spring 33 is fixedly connected to the inner wall of the limiting plate 31. Control blocks 34 are fixedly connected to both sides of the sliding toothed plate 32. The surface of the control blocks 34 is slidably connected to the inside of the limiting plate 31. A pressure block 35 is slidably connected inside the limiting plate 31. A return spring 36 is installed on the surface of the pressure block 35. One end of the reset spring 36 is fixedly connected to the inner wall of the limiting plate 31. The sliding toothed plate 32 has a slidingly connected snap-fit ​​block 37. The bottom end of the snap-fit ​​block 37 is fixedly connected to the bottom of the inner cavity of the sliding toothed plate 32 through the snap-fit ​​spring 38. The top of the inner cavity of the sliding toothed plate 32 is provided with a snap-fit ​​groove 39. The inner surface of the snap-fit ​​groove 39 is snapped with the surface of the snap-fit ​​block 37. The top of the sliding toothed plate 32 causes the opening and closing plate 310 to rotate through the transmission component 5. The surface of the opening and closing plate 310 is in contact with the inner surface of the sample inlet tube 413.

[0041] When the limiting spring 33 is not affected by external force, it will keep the sliding tooth plate 32 in the reset state, and at this time the opening and closing plate 310 will keep the sample inlet tube 413 in the closed state.

[0042] When the snap-fit ​​spring 38 is not affected by external force, it will keep the snap-fit ​​block 37 in contact with the inner surface of the snap-fit ​​groove 39.

[0043] The bottom end of the pressure block 35 extends through into the snap-fit ​​groove 39. Pressing the pressure block 35 will compress the return spring 36, and at the same time, the bottom end of the pressure block 35 will push the snap-fit ​​block 37 out of the snap-fit ​​groove 39.

[0044] In this embodiment, the transmission assembly 5 includes a transmission rod 51 rotatably installed inside the sample inlet tube 413. One end of the transmission rod 51 is fixedly connected to the inside of the opening and closing plate 310, and the other end of the transmission rod 51 is fixedly connected to a transmission gear 52. The surface of the transmission gear 52 meshes with the top of the sliding toothed plate 32.

[0045] By actuating the control block 34, the sliding toothed plate 32 slides inside the limiting plate 31. The sliding of the sliding toothed plate 32 causes the transmission gear 52, transmission rod 51, and opening / closing plate 310 to rotate synchronously, thereby connecting the gas storage tank, sample inlet tube 413, and filter box 411. When the sliding toothed plate 32 slides, the limiting spring 33 is compressed. The sliding of the sliding toothed plate 32 causes the locking block 37 to move synchronously, thereby causing the locking block 37 to slide into the locking groove 39, and the locking spring... Under the influence of the elasticity of 38, the inner surface of the snap-fit ​​block 37 and the snap-fit ​​groove 39 are kept snapped together, so that the opening and closing plate 310 is always kept in the open and closed state. By setting the opening and closing component 3, the sample inlet tube 413 can be opened and closed freely. When replacing the gas storage tank, the sample inlet tube 413 can be closed to prevent the filter box 411 from contacting the external gas. After the gas storage tank is replaced, the sample inlet tube 413 can be quickly opened to connect the gas storage tank and the filter box 411. The operation process is convenient.

[0046] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0047] During operation, the sample inlet tube 413 is first connected to the gas storage tank on one side of the housing 2. Then, by moving the control block 34, the sliding toothed plate 32 slides inside the limiting plate 31. The sliding of the sliding toothed plate 32 causes the transmission gear 52, transmission rod 51, and opening / closing plate 310 to rotate synchronously, thereby connecting the gas storage tank, sample inlet tube 413, and filter box 411. When the sliding toothed plate 32 slides, the limiting spring 33 is compressed, and the sliding of the sliding toothed plate 32 causes the locking block 37 to move synchronously, thereby causing the locking block 37 to slide into the locking groove 39. Under the influence of the elasticity of the locking spring 38, the locking block 37 is locked to the inner surface of the locking groove 39, thus keeping the opening / closing plate 310 in the open / closed state. Then, the drive motor 442 is started to drive the drive disc 44. 3. The drive block 444 rotates, causing it to slide on the inner surface of the linkage groove 433. This causes the linkage plate 432, sliding rod 418, and piston 417 to slide upwards synchronously. At this time, the gas pressure inside the quantitative tank 412 changes, thereby extracting the gas to be tested from the gas storage tank through the connecting pipe 414, filter box 411, and sample inlet pipe 413. The gas to be tested is filtered through the coarse filter element, fine filter element, and adsorption filter element in the filter box 411. Simultaneously, when the sliding rod 418 slides, it will drive the quantitative plate 421 and pointer 423 to slide synchronously. By observing the pointer 423 and scale plate 422, the amount of gas to be tested entering the quantitative tank 412 can be intuitively understood, thereby achieving the effect of quantitative sample injection and improving the quality of subsequent detection.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas chromatograph sample gas injection device comprising a gas chromatograph body (1) characterised in that: The top of the gas chromatograph body (1) is provided with a box (2), the top of the box (2) is provided with an opening and closing assembly (3), the inside of the box (2) is provided with a quantitative sampling mechanism (4), the quantitative sampling mechanism (4) comprises: The sampling assembly (41) comprises a filter box (411) and a quantitative tank (412) installed on the inner wall of the box (2), the top of the filter box (411) is fixedly connected with a sampling pipe (413), one side of the quantitative tank (412) is fixedly communicated with the bottom of the quantitative tank (412) through a connecting pipe (414), the bottom of the quantitative tank (412) is fixedly connected with the top of the gas chromatograph body (1) through an air inlet pipe (415), the surface of the air inlet pipe (415) and the surface of the connecting pipe (414) are both provided with a one-way valve (416), the inside of the quantitative tank (412) is slidably connected with a piston (417), the top of the piston (417) is fixedly connected with a sliding rod (418), the surface of the sliding rod (418) is slidably connected with the inside of the box (2); The quantitative assembly (42) is arranged on the surface of the sliding rod (418); The linkage assembly (43) is arranged at the top end of the sliding rod (418); The driving assembly (44) is arranged at the top of the box (2).

2. A gas chromatograph sample gas injection device as defined in claim 1, wherein: The quantitative assembly (42) comprises a quantitative plate (421) installed on the surface of the sliding rod (418) and a scale plate (422) installed on one side of the box (2), the surface of the quantitative plate (421) is slidably connected with the inside of the box (2), and one end of the quantitative plate (421) is fixedly connected with a pointer (423).

3. A gas chromatograph sample gas injection device as defined in claim 1, wherein: The linkage assembly (43) comprises a linkage block (431) installed at the top end of the sliding rod (418), one side of the linkage block (431) is fixedly connected with a linkage plate (432), and the surface of the linkage plate (432) is provided with a linkage groove (433).

4. A gas chromatograph sample gas injection device as defined in claim 3, wherein: The driving assembly (44) comprises a fixed plate (441) installed at the top of the box (2), the rear side of the fixed plate (441) is fixedly connected with a driving motor (442), one end of the output shaft of the driving motor (442) is fixedly connected with a driving disc (443) through a shaft coupling, one side of the driving disc (443) is fixedly connected with a driving block (444), and the surface of the driving block (444) is slidably connected with the inner surface of the linkage groove (433).

5. A gas chromatograph sample gas injection device as defined in claim 1, wherein: The opening and closing assembly (3) includes a limiting plate (31) installed on the top of the box (2), the inside of the limiting plate (31) is slidably connected with a sliding tooth plate (32), one side of the sliding tooth plate (32) is fixedly connected with a limiting spring (33), one end of the limiting spring (33) is fixedly connected with the inner wall of the limiting plate (31), both sides of the sliding tooth plate (32) are fixedly connected with control blocks (34), the surface of the control block (34) is slidably connected with the inside of the limiting plate (31), the inside of the limiting plate (31) is slidably connected with a pressing block (35), the surface of the pressing block (35) is provided with a return spring (36), one end of the return spring (36) is fixedly connected with the inner wall of the limiting plate (31), the inside of the sliding tooth plate (32) is slidably connected with a clamping block (37), the bottom end of the clamping block (37) is fixedly connected with the bottom of the inner cavity of the sliding tooth plate (32) through a clamping spring (38), the top of the inner cavity of the sliding tooth plate (32) is provided with a clamping groove (39), the inner surface of the clamping groove (39) is clamped with the surface of the clamping block (37), the top of the sliding tooth plate (32) is rotated through a transmission assembly (5), the surface of the opening and closing plate (310) is attached to the inner surface of the sample inlet tube (413).

6. A gas chromatograph sample gas injection device as defined in claim 5, wherein: The transmission assembly (5) includes a transmission rod (51) rotatably installed in the inside of the sample inlet tube (413), one end of the transmission rod (51) is fixedly connected with the inside of the opening and closing plate (310), the other end of the transmission rod (51) is fixedly connected with a transmission gear (52), the surface of the transmission gear (52) is engaged with the top of the sliding tooth plate (32).

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