An injection device for a gas chromatograph

Abstract

This utility model discloses a sample injection device for a gas chromatograph, specifically relating to the field of gas chromatograph detection technology. It includes a housing, a sample tray mounted on the upper part of the housing, and an injection arm assembly. The surface of the sample tray has multiple sample placement slots arranged in a circumferential array. One sample placement slot contains a solvent rinsing bottle, another contains an empty bottle, and the remaining slots each contain a sample bottle. This utility model, by incorporating a transparent isolation ring, a transparent barrier cylinder, an inner baffle ring, and an outer baffle ring, can isolate and protect the sample bottles, solvent rinsing bottles, and empty bottles on the sample tray, preventing interference with the movement of the sampling needle and the rotation of the sample tray. It also prevents dust intrusion, thus improving detection accuracy. Furthermore, it includes a control mechanism with rotating, lifting, and fixing components, allowing adjustment of the transparent isolation ring position to accommodate sample bottles of different heights, and facilitating disassembly and cleaning, thereby improving cleanliness.

Description

Technical Field

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

[0002] Gas chromatographs (GCs), as highly efficient component separation and detection devices, are widely used in chemical, environmental, food, and pharmaceutical fields. Their core function is to separate the components in a sample using a chromatographic column, and then perform quantitative and qualitative analysis using a detector. The injection device, a key component of the GC, plays a crucial role in accurately and cleanly introducing the sample into the chromatographic system. Its performance directly determines the accuracy, repeatability, and stability of the detection results. The injection device mainly includes an autosampler sample tray driven by a stepper motor or DC motor, used to store a large number of samples; and a column-shaped core component on the GC containing a lifting mechanism to move the sampling needle, called the autosampler injection arm assembly. This assembly is the key execution unit responsible for "accurate sample delivery" in the automated injection system and must work in conjunction with the autosampler sample tray to complete the automated injection process.

[0003] Gas chromatographs operate rapidly and are highly efficient at picking up and delivering numerous samples from the sample tray in the injection device. However, when the sampling execution component is sampling one sample vial, the remaining vials, though stationary, are constantly exposed to the laboratory air. On one hand, dust particles, suspended fibers, and other impurities in the laboratory air will settle onto the surface of the vial's membrane with the airflow, and some tiny impurities may even seep into the vial through the membrane's tiny pores. On the other hand, the movement of the sampling needle may generate airflow disturbances, accelerating the diffusion and adhesion of airborne impurities to the unsampled vials. Since gas chromatographs have extremely high detection precision and stringent requirements for sample purity, this can affect the accuracy of the detection data. Currently, some existing sampling devices are equipped with simple dust covers that completely cover the multi-station sample storage components. However, these dust covers need to be opened and closed frequently when adding samples or for maintenance, and the air inside the cover still circulates with the outside. This makes it impossible to achieve real-time and accurate sealing of unsampled vials. Some other technologies attempt to set a sliding shield on the top of the sample vial, but the movement of the shield can easily interfere with the movement trajectory of the sampling needle, leading to sampling failure. Furthermore, these technologies cannot be adapted to sample vials of different sizes, resulting in poor versatility.

[0004] In summary, in order to ensure the sample loading and delivery efficiency of the gas chromatograph's sample tray while meeting the instrument's stringent requirements for sample purity to ensure detection accuracy, it is necessary to address the issues of exposed and contaminated film at the mouth of unsampled vials during sampling, insufficient sealing of existing dustproof solutions, susceptibility to interference, and poor versatility. The goal is to achieve real-time and precise sealing of unsampled vials to prevent impurities from affecting the accuracy of detection data. Utility Model Content

[0005] The present invention provides a sample injection device for a gas chromatograph, which aims to solve the problems of: failure to detect contamination of the sample bottle opening membrane during sampling, insufficient sealing of existing dustproof solutions, easy interference, and poor versatility.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sample injection device for a gas chromatograph, comprising a housing, a sample tray mounted on the upper end of the housing, and an injection arm assembly. The surface of the sample tray is provided with multiple sample placement slots arranged in a circumferential array. One sample placement slot contains a solvent rinsing bottle, another sample placement slot contains an empty bottle, and the remaining sample placement slots each contain a sample bottle. A transparent isolation ring is provided on the upper side of the sample bottle, solvent rinsing bottle, and empty bottle. A through hole is provided on the surface of the transparent isolation ring, and a transparent barrier cylinder is fixedly connected to the upper end of the through hole. An inner retaining ring and an outer retaining ring are fixedly connected to the inner and outer sides of the bottom of the transparent isolation ring, respectively. A connecting handle is fixedly connected to one side of the transparent isolation ring. A control mechanism is installed on the housing, which is used to drive the transparent isolation ring to move along a predetermined trajectory.

[0007] In a preferred embodiment, the control mechanism includes a rotating component mounted on the upper end of the housing, a lifting component mounted on the output end of the rotating component, and a fixed component fixedly connected to the output end of the lifting component. The rotating component drives the transparent isolation ring to rotate through the lifting component and the fixed component, the lifting component drives the transparent isolation ring to move up and down through the fixed component, and the fixed component is used to fix the transparent isolation ring.

[0008] In a preferred embodiment, the rotating assembly includes a rotary motor fixedly connected to the housing and a mounting plate fixedly connected to the output end of the rotary motor, wherein the rotary motor is used to drive the mounting plate to rotate.

[0009] In a preferred embodiment, the lifting assembly includes a lifting cylinder fixedly connected to the mounting plate and a mounting base fixedly connected to the output end of the lifting cylinder. The lifting cylinder is used to drive the mounting base to perform lifting movements.

[0010] In a preferred embodiment, the fixing assembly includes a mounting shell fixedly connected to the mounting base, a threaded rod threaded through the upper end of the mounting shell, a clamping plate rotatably connected to the bottom of the threaded rod, and a knob fixedly connected to the top of the threaded rod, with one end of the connecting handle inserted between the clamping plate and the bottom side of the mounting shell.

[0011] In a preferred embodiment, the bottom of the clamping plate is fixedly connected with a plurality of pins, and one side of the connecting handle is provided with a plurality of insertion holes for the pins to be inserted, and the bottom of the mounting shell is provided with a plurality of insertion holes for the pins to be inserted.

[0012] In a preferred embodiment, a plurality of support columns are fixedly connected to the upper end of the box, a support tray is fixedly connected to the upper end of the support columns, and a sealing disc is rotatably connected to the upper end of the support tray.

[0013] In a preferred embodiment, a second through hole is provided on the surface of the sealing disc, an isolation cover is fixedly connected to the upper end of the second through hole, and a sealing ring is fixedly connected to the outer bottom of the sealing disc, with a notch provided on one side of the sealing ring.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention utilizes a transparent isolation ring, a transparent barrier cylinder, an inner baffle ring, and an outer baffle ring. The transparent isolation ring provides sealed protection for the sample bottles, solvent rinsing bottles, and empty bottles placed on the sample tray, while the transparent barrier cylinder provides sampling isolation and protection for the sampling needle in the injection arm assembly. This design does not affect the sample tray's rotation sampling operation or interfere with the movement trajectory of the sampling needle, thus isolating and protecting each sample and preventing dust from adhering and entering, thereby improving the accuracy of the test data.

[0016] This invention uses a control mechanism to operate the transparent isolation ring. The control mechanism consists of a rotating component, a lifting component, and a fixing component. The rotating and lifting components can work together to adjust the position of the transparent isolation ring to accommodate sample bottles of different heights. The fixing component allows for easy disassembly and assembly of the transparent isolation ring, enabling effective cleaning before reassembly and improving the cleanliness of the transparent isolation ring.

[0017] This invention, by setting up a support tray, a sealing plate, and an isolation cover, can work with the control mechanism to quickly store and protect the transparent isolation ring and transparent barrier cylinder, preventing them from being exposed to air for too long and thus avoiding dust accumulation, thereby reducing sample contamination during use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0019] Figure 2 This is a partial three-dimensional structural diagram of the present invention.

[0020] Figure 3 This is a partial disassembly diagram of the present invention.

[0021] Figure 4 This is a schematic diagram of the connection structure between the transparent isolation ring and the control mechanism of this utility model.

[0022] Figure 5 This is a schematic diagram of the bottom structure of the transparent isolation ring of this utility model.

[0023] Figure 6 This is a three-dimensional structural diagram of the mounting shell of this utility model.

[0024] Figure 7 This is a three-dimensional structural diagram of the clamping plate of this utility model.

[0025] Figure 8 This is a schematic diagram of the connection structure between the support tray and the sealing disc of this utility model. Figure 1 .

[0026] Figure 9 This is a schematic diagram of the connection structure between the support tray and the sealing disc of this utility model. Figure 2 .

[0027] The attached figures are labeled as follows: 1. Box body; 2. Sample tray; 3. Sample inlet arm assembly; 4. Sample placement slot; 5. Sample bottle; 6. Solvent rinsing bottle; 7. Empty bottle; 801. Rotary motor; 802. Mounting plate; 803. Lifting cylinder; 804. Mounting base; 805. Mounting shell; 806. Threaded rod; 807. Pressure plate; 808. Knob; 9. Transparent isolation ring; 10. Transparent barrier cylinder; 11. Inner retaining ring; 12. Outer retaining ring; 13. Through hole one; 14. Connecting handle; 15. Support column; 16. Support tray; 17. Sealing plate; 18. Through hole two; 19. Isolation cover; 20. Sealing ring; 21. Insertion post; 22. Insertion hole one; 23. Insertion hole two. Detailed Implementation

[0028] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0029] Refer to the instruction manual appendix Figures 1 to 9 A sample injection device for a gas chromatograph includes a housing 1, a sample tray 2 mounted on the upper end of the housing 1, and an injection arm assembly 3. The surface of the sample tray 2 has multiple sample placement slots 4 arranged in a circumferential array. One sample placement slot 4 contains a solvent rinsing bottle 6, another sample placement slot 4 contains an empty bottle 7, and the remaining sample placement slots 4 each contain a sample bottle 5. A transparent isolation ring 9 is provided on the upper side of the sample bottle 5, the solvent rinsing bottle 6, and the empty bottle 7. A through hole 13 is provided on the surface of the transparent isolation ring 9. A transparent barrier cylinder 10 is fixedly connected to the upper end of the through hole 13. An inner retaining ring 11 and an outer retaining ring 12 are fixedly connected to the inner and outer sides of the bottom of the transparent isolation ring 9, respectively. A connecting handle 14 is fixedly connected to one side of the transparent isolation ring 9. A control mechanism is installed on the housing 1 to drive the transparent isolation ring 9 to move along a predetermined trajectory.

[0030] It should be noted that when the control mechanism moves the transparent isolation ring 9 directly above the sample tray 2, the transparent barrier cylinder 10 on the transparent isolation ring 9 is also exactly on the movement trajectory of the sampling needle in the injection arm assembly 3. The sampling needle can pass through the transparent barrier cylinder 10 and the through hole 13 on the transparent isolation ring 9 to continue moving downwards to carry out the sample delivery process. The sample bottle 5, solvent rinsing bottle 6, and empty bottle 7 are supporting facilities used by conventional gas chromatographs. The sample bottle 5 is used to store each sample, the solvent rinsing bottle 6 is used to clean the sampling needle, and the empty bottle 7 is used to empty the sample in the sampling needle.

[0031] Refer to the instruction manual appendix Figure 2 and Figure 4 The control mechanism includes a rotating component installed on the upper end of the housing 1, a lifting component installed on the output end of the rotating component, and a fixed component fixedly connected to the output end of the lifting component. The rotating component drives the transparent isolation ring 9 to rotate through the lifting component and the fixed component. The lifting component drives the transparent isolation ring 9 to move up and down through the fixed component. The fixed component is used to fix the transparent isolation ring 9.

[0032] It should be noted that the fixing component facilitates the installation and removal of the transparent isolation ring 9, the lifting component is used to adjust the position of the transparent isolation ring 9 by lifting, and the rotating component is used to adjust the position of the transparent isolation ring 9 by rotating.

[0033] Refer to the instruction manual appendix Figure 4 The rotating assembly includes a rotary motor 801 fixedly connected to the housing 1 and a mounting plate 802 fixedly connected to the output end of the rotary motor 801. The rotary motor 801 is used to drive the mounting plate 802 to rotate.

[0034] It should be noted that starting the rotary motor 801 drives the mounting plate 802 to rotate, which in turn drives the transparent isolation ring 9 to rotate.

[0035] Refer to the instruction manual appendix Figure 4 The lifting assembly includes a lifting cylinder 803 fixedly connected to the mounting plate 802 and a mounting base 804 fixedly connected to the output end of the lifting cylinder 803. The lifting cylinder 803 is used to drive the mounting base 804 to perform lifting movements.

[0036] It should be noted that starting the lifting cylinder 803 drives the mounting base 804 to move up and down, which in turn drives the transparent isolation ring 9 to move up and down.

[0037] Refer to the instruction manual appendix Figure 4The fixing assembly includes a mounting shell 805 fixedly connected to the mounting base 804, a threaded rod 806 threadedly connected to the upper end of the mounting shell 805, a clamping plate 807 rotatably connected to the bottom of the threaded rod 806, and a knob 808 fixedly connected to the top of the threaded rod 806. One end of the connecting handle 14 is inserted between the clamping plate 807 and the bottom side of the mounting shell 805.

[0038] It should be noted that when one side of the connecting handle 14 is inserted into the bottom of the inner side of the mounting housing 805, the knob 808 is turned to drive the threaded rod 806 to rotate. The threaded rod 806 pushes the clamping plate 807 downward to squeeze and fix the connecting handle 14, thereby fixing the transparent isolation ring 9.

[0039] Refer to the instruction manual appendix Figures 5 to 7 The bottom of the clamping plate 807 is fixedly connected with multiple plugs 21, and the side of the connecting handle 14 is provided with multiple insertion holes 22 for the plugs 21 to be inserted. The bottom of the mounting shell 805 is provided with multiple insertion holes 23 for the plugs 21 to be inserted.

[0040] It should be noted that this embodiment is based on the additional technology of the fixing component. All the components of the original fixing component can be retained, while multiple insertion posts 21 are added to the bottom of the clamping plate 807, and a matching insertion hole 22 is opened on the connecting handle 14, and a matching insertion hole 23 is opened on the bottom of the mounting shell 805. In this way, when the clamping plate 807 presses the connecting handle 14, the insertion posts 21 are inserted into the insertion holes 22 and 23, which further locks and reinforces the connecting handle 14 and improves the fixing effect of the transparent isolation ring 9.

[0041] Refer to the instruction manual appendix Figure 8 Multiple support columns 15 are fixedly connected to the upper end of the housing 1, and a support tray 16 is fixedly connected to the upper end of the support column 15. A sealing disc 17 is rotatably connected to the upper end of the support tray 16.

[0042] It should be noted that when the gas chromatograph is not in use, i.e. in its initial state, the transparent isolation ring 9 can be moved onto the support tray 16 using the control mechanism, and then the sealing plate 17 can be rotated down to isolate and protect the transparent isolation ring 9.

[0043] Refer to the instruction manual appendix Figure 9 The surface of the sealing disc 17 has a through hole 18, and an isolation cover 19 is fixedly connected to the upper end of the through hole 18. A sealing ring 20 is fixedly connected to the bottom outer side of the sealing disc 17, and a notch is opened on one side of the sealing ring 20.

[0044] It should be noted that the isolation cover 19 covers the transparent barrier cylinder 10 to provide auxiliary isolation and protection, and the sealing ring 20 strengthens the isolation and protection of the transparent isolation ring 9. The position of the notch is to allow the connecting handle 14 to pass through.

[0045] Another embodiment based on the sealing ring 20 design: The main structure and notch design of the original sealing ring 20 can be retained, while the material and cross-sectional structure of the sealing ring 20 are optimized: Firstly, for different laboratory temperature and humidity environments, the sealing ring 20 can be made of two suitable materials: Nitrile rubber is used in normal environments, with a temperature resistance range of 40℃ to 120℃, suitable for most laboratory scenarios; perfluoroelastomer rubber is used in high-temperature and high-humidity environments, with a temperature resistance range of -20℃ to 260℃ and excellent resistance to water vapor penetration; Secondly, in The bottom of the sealing ring 20 is provided with 3-4 annular protrusions along the circumferential direction. The cross-section of the annular protrusions is semi-circular with a radius of 0.5-1mm. The annular protrusions and the sealing ring 20 are integrally formed. With this design, when the sealing disc 17 covers the support tray 16, the annular protrusions can fit tightly against the surface of the support tray 16 through elastic deformation, increasing the sealing contact area and reducing gaps. At the same time, the selection of different materials can improve the adaptability of the device in various environments, prevent the sealing ring 20 from aging and failing due to environmental factors, and extend its service life.

[0046] Working principle: Under normal conditions, the transparent isolation ring 9 and the transparent barrier cylinder 10 are housed within the protection of the support tray 16, the sealing plate 17, and the isolation cover 19. When using the gas chromatograph, first place each sample vial 5, solvent rinsing bottle 6, and empty bottle 7 into the sample placement slots 4 on the sample tray 2. Then, rotate and open the sealing plate 17. Using the control mechanism, first activate the lifting cylinder 803 in the lifting assembly to raise the mounting base 804, thereby raising the transparent isolation ring 9. Next, activate the rotary motor 801 in the rotating assembly to rotate the mounting plate 802, thereby driving the transparent isolation ring 9 to rotate to the position directly above the sample tray 2. The transparent isolation ring 9 is lowered to a position close to the top surface of the sample vial 5 by the lifting assembly, which isolates and protects the sample vials 5, solvent rinsing vials 6 and empty vials 7. At this time, the transparent barrier tube 10 on the transparent isolation ring 9 is also exactly on the movement trajectory of the sampling needle in the injection arm assembly 3, which isolates and protects the sampling needle without affecting its operation. After the device is used, the transparent isolation ring 9 and the transparent barrier tube 10 can be stored in the support tray 16, sealing plate 17 and isolation cover 19 for protection by the control mechanism. When the transparent isolation ring 9 is contaminated, it can be removed by the fixing assembly for cleaning and then reinstalled.

[0047] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. An injection device for a gas chromatograph, characterized in that: The device includes a housing (1), a sample tray (2) mounted on the upper part of the housing (1), and a sample inlet arm assembly (3). The surface of the sample tray (2) has multiple sample placement slots (4) arranged in a circumferential array. One sample placement slot (4) contains a solvent rinsing bottle (6), another sample placement slot (4) contains an empty bottle (7), and the remaining sample placement slots (4) each contain a sample bottle (5). The sample bottle (5), the solvent rinsing bottle (6), and the empty bottle (7) are all present in the sample tray (5). A transparent isolation ring (9) is provided on the upper side. A through hole (13) is provided on the surface of the transparent isolation ring (9). A transparent barrier cylinder (10) is fixedly connected to the upper end of the through hole (13). An inner retaining ring (11) and an outer retaining ring (12) are fixedly connected to the inner and outer sides of the bottom of the transparent isolation ring (9) respectively. A connecting handle (14) is fixedly connected to one side of the transparent isolation ring (9). A control mechanism is installed on the housing (1). The control mechanism is used to drive the transparent isolation ring (9) to move along a predetermined trajectory.

2. The sample injection device for a gas chromatograph according to claim 1, characterized in that: The control mechanism includes a rotating component installed on the upper end of the housing (1), a lifting component installed on the output end of the rotating component, and a fixed component fixedly connected to the output end of the lifting component. The rotating component drives the transparent isolation ring (9) to rotate through the lifting component and the fixed component. The lifting component drives the transparent isolation ring (9) to move up and down through the fixed component. The fixed component is used to fix the transparent isolation ring (9).

3. The sample introduction device for a gas chromatograph according to claim 2, characterized in that: The rotating assembly includes a rotary motor (801) fixedly connected to the housing (1) and a mounting plate (802) fixedly connected to the output end of the rotary motor (801). The rotary motor (801) is used to drive the mounting plate (802) to rotate.

4. The sample injection device for a gas chromatograph according to claim 3, characterized in that: The lifting assembly includes a lifting cylinder (803) fixedly connected to the mounting plate (802) and a mounting base (804) fixedly connected to the output end of the lifting cylinder (803). The lifting cylinder (803) is used to drive the mounting base (804) to perform lifting movements.

5. The sample injection device for a gas chromatograph according to claim 4, characterized in that: The fixing assembly includes a mounting shell (805) fixedly connected to the mounting base (804), a threaded rod (806) threaded through the upper end of the mounting shell (805), a clamping plate (807) rotatably connected to the bottom of the threaded rod (806), and a knob (808) fixedly connected to the top of the threaded rod (806). One end of the connecting handle (14) is inserted between the clamping plate (807) and the bottom side of the mounting shell (805).

6. The sample injection device for a gas chromatograph according to claim 5, characterized in that: The bottom of the clamping plate (807) is fixedly connected with multiple plugs (21), and the side of the connecting handle (14) is provided with multiple plug holes (22) for the plugs (21) to be inserted. The bottom of the mounting shell (805) is provided with multiple plug holes (23) for the plugs (21) to be inserted.

7. The sample injection device for a gas chromatograph according to claim 1, characterized in that: Multiple support columns (15) are fixedly connected to the upper end of the box (1), and a support tray (16) is fixedly connected to the upper end of the support column (15). A sealing plate (17) is rotatably connected to the upper end of the support tray (16).

8. The sample injection device for a gas chromatograph according to claim 7, characterized in that: The surface of the sealing disc (17) has a through hole two (18), and an isolation cover (19) is fixedly connected to the upper end of the through hole two (18). A sealing ring (20) is fixedly connected to the bottom outer side of the sealing disc (17), and a notch is opened on one side of the sealing ring (20).

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