A visual gas sampling system for a gas chromatograph

Abstract

The utility model discloses a kind of visual gas sampling systems of gas chromatograph, specifically related to gas chromatograph technical field, including the air inlet pipe on gas chromatograph, the air inlet pipe rear end is equipped with adapter pipe, and air inlet pipe is communicated with adapter pipe by connecting piece;The connecting piece includes the assembling pipe of the air inlet pipe rear end, the through hole of multiple annular array distribution is opened in the assembling pipe front side, and the through hole rear end opening extends to the outside of assembling pipe rear end. The utility model is displaced by rotating and adjusting ring thread connection of air inlet pipe, adjusting ring drives the displacement of swing connection's ring plate, ring plate drives movable plate to drive swing connection's linkage plate to move back, linkage plate again promotes the displacement of clamping plate to the inside of clamping groove along the through hole bevel, by the clamping of clamping plate and clamping groove, adapter pipe is fixed, so one step can be completed to the multi-party fixing of adapter pipe, improve operation convenience and clamping efficiency.

Description

Technical Field

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

[0002] Gas chromatographs are instruments of paramount importance in the field of chemical analysis. Based on the differences in the partition coefficients of different substances between the stationary and mobile phases, they achieve the separation and analysis of components in complex mixtures. They play an irreplaceable and crucial role in numerous scientific research and industrial production fields. The gas inlet system is one of the key components of a gas chromatograph, its main function being to accurately, stably, and appropriately introduce the gas sample to be analyzed into the chromatographic column.

[0003] As shown in the prior art of CN218331394U, this prior art uses a reinforced assembly, which includes a fixed plate, a rotating shaft, a rotating plate, a protrusion, a locking block, a locking groove, and a spring. When the operator needs to connect the suction pipe to the air pipe for suction, they only need to pull the protrusion outward, causing the protrusion to drive the rotating plate to rotate on the rotating shaft. During the rotation, the spring is compressed and deformed until the rotating plate is rotated to a position perpendicular to the suction pipe. This operation is performed on both the upper and lower sets of rotating plates. Then, the suction pipe is connected to the air pipe. At this time, the pulled protrusion is loosened, and the spring's own restoring force pushes the rotating plate back to its original position, causing the rotating plate to drive the locking block to engage with the locking groove on the outer wall of the air pipe to form a fixed position. At this time, the two sets of rotating plates engage the air pipe, ensuring that the suction pipe and air pipe will not fall off during the suction process. Through this design, the suction pipe and air pipe connection will not be broken by external force, improving the air intake efficiency. However, the connection method between the air pipe and the suction pipe in the prior art is rather cumbersome. After the air inlet pipe and the suction pipe are connected, fasteners are still required for fixed assembly, which increases the number of operation steps. In addition, the two sets of rotating plates cannot operate synchronously, which also affects the operation efficiency. Therefore, the ease of operation of this technical solution is affected. Utility Model Content

[0004] To overcome the aforementioned deficiencies of the prior art, this utility model provides a visual gas injection system for a gas chromatograph. By rotating an adjusting ring threadedly connected to the inlet pipe, the adjusting ring moves the movable ring plate, which in turn drives a moving plate to move the movable linkage plate backward. The linkage plate then pushes a clamping plate along the inclined surface of the through hole into the groove. The connecting tube is fixed by the engagement of the clamping plate and the groove. In this way, the connecting tube can be fixed from multiple directions in one step, improving the convenience of operation and the clamping efficiency, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a visual gas injection system for a gas chromatograph, comprising an inlet pipe installed on the gas chromatograph, wherein a connecting pipe is provided at the rear end of the inlet pipe, and the inlet pipe is connected to the connecting pipe through a connector;

[0006] The connector includes an assembly tube installed at the rear end of the intake pipe. The front side of the assembly tube has multiple through holes arranged in a ring array. The rear end opening of the through holes extends to the outside of the rear end of the assembly tube. A slot is provided inside the connecting tube on one side corresponding to the through hole. A retaining plate is provided inside the rear end of the through hole. A fixing hole is provided on the front side of the retaining plate. A fixing post is installed inside the fixing hole. A linkage plate is provided outside the fixing post. A movable plate is rotatably connected to the front end of the linkage plate.

[0007] The air intake pipe has an annular groove on its outside, and an adjustment component for driving the moving plate to shift inside the annular groove.

[0008] In a preferred embodiment, the adjusting member includes an annular plate disposed in an annular groove, and the front end of the movable plate passes through the air intake pipe and is fixed together with the rear side of the annular plate. A movable hole is provided on the rear end of the air intake pipe corresponding to the side of the movable plate, and the movable plate is disposed inside the movable hole.

[0009] The front side of the ring plate is provided with an adjusting ring that is rotatably connected, and the adjusting ring is sleeved on the outside of the air intake pipe.

[0010] In a preferred embodiment, the inner wall of the adjusting ring is machined with an internal thread, and the outer side of the ring groove corresponding to the internal thread is machined with an external thread, and the adjusting ring is threadedly connected to the ring groove.

[0011] In a preferred embodiment, a fixed ring plate is installed on the front side of the ring plate, and a fixed ring groove is provided on the rear side of the adjusting ring. The rear end of the fixed ring plate extends into the fixed ring groove, and the cross-section of the fixed ring plate and the cross-section of the fixed ring groove are both T-shaped.

[0012] In a preferred embodiment, the top of the air intake pipe has an installation hole, and a filter screen extending into the air intake pipe is installed inside the installation hole. An installation plate is installed on the top of the filter screen, and the installation plate is fixed to the air intake pipe by bolts.

[0013] In a preferred embodiment, a thermal mass flow meter is provided on the front side of the mounting plate. The thermal mass flow meter is installed on the top of the air inlet pipe, and the detection end of the thermal mass flow meter passes through the air inlet pipe and extends into the interior of the air inlet pipe.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] 1. By rotating the adjusting ring connected to the intake pipe, the adjusting ring moves the movable ring plate, which in turn moves the moving plate and the movable linkage plate backward. The linkage plate then pushes the clamping plate along the inclined surface of the through hole into the groove. The connecting pipe is fixed by the engagement of the clamping plate and the groove. In this way, the connecting pipe can be fixed in multiple ways in one step, which improves the convenience of operation and the clamping efficiency.

[0016] 2. The gas is filtered through a filter screen, which facilitates the delivery of clean air into the gas chromatograph. The filter screen is connected to the air inlet pipe by bolts on the mounting plate, which allows for easy disassembly and assembly via threaded connection.

[0017] 3. By using a thermal mass flow meter to detect the gas flow rate in the inlet pipe and displaying the real-time dynamic flow rate, operators can gain a comprehensive and real-time view of the gas injection process and the continuous changes in flow rate, promptly detect various problems such as blockage and abnormal flow, greatly improve the accuracy and reliability of injection, and significantly reduce the probability of injection failure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a side sectional view of the connecting pipe of this utility model;

[0020] Figure 3 This is a side sectional view of the air intake pipe of this utility model;

[0021] Figure 4 This is a side sectional view of the through hole of this utility model;

[0022] Figure 5 This is a side sectional view of the adjusting ring of this utility model;

[0023] Figure 6 This is an exploded view of the card plate of this utility model.

[0024] The attached diagram is labeled as follows: 1. Inlet pipe; 2. Connecting pipe; 3. Assembly pipe; 4. Through hole; 5. Slot; 6. Card plate; 7. Fixing hole; 8. Fixing column; 9. Linkage plate; 10. Moving plate; 11. Ring groove; 12. Ring plate; 13. Moving hole; 14. Adjusting ring; 15. Internal thread; 16. External thread; 17. Fixed ring plate; 18. Fixed ring groove; 19. Mounting hole; 20. Filter screen; 21. Mounting plate; 22. Thermal mass flow meter. Detailed Implementation

[0025] 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.

[0026] Refer to the instruction manual appendix Figure 1-6 This utility model provides a visual gas injection system for a gas chromatograph, including an inlet pipe 1 installed on the gas chromatograph. The inlet pipe 1 has a connecting pipe 2 at its rear end, and the inlet pipe 1 is connected to the connecting pipe 2 through a connector. The connector includes an assembly pipe 3 installed at the rear end of the inlet pipe 1. The assembly pipe 3 has multiple through holes 4 arranged in a ring array on its front side. The rear end opening of the through holes 4 extends to the outside of the rear end of the assembly pipe 3. A slot 5 is provided inside the connecting pipe 2 on one side corresponding to the through holes 4. A retaining plate 6 is provided inside the rear end of the through holes 4. A fixing hole 7 is provided on the front side of the retaining plate 6. A fixing post 8 is installed inside the fixing hole 7. A linkage plate 9 is provided outside the fixing post 8. A moving plate 10 is rotatably connected to the front end of the linkage plate 9. An annular groove 11 is provided outside the inlet pipe 1. An adjusting component for driving the moving plate 10 to move is provided inside the annular groove 11.

[0027] When the gas is delivered to the gas chromatograph through the inlet pipe 1, the operator needs to connect the inlet pipe 1 with the connecting pipe 2. Because the moving plate 10, the linkage plate 9, and the clamping plate 6 are movably connected, the operator can operate the adjusting component to drive the moving plate 10 to move backward. The adjusting component includes an annular plate 12 located in the annular groove 11, and the front end of the moving plate 10 passes through the inlet pipe 1 and is fixed to the rear side of the annular plate 12. The rear end of the inlet pipe 1 has a moving hole 13 on one side corresponding to the moving plate 10, and the moving plate 10 is located inside the moving hole 13. The front side of the annular plate 12 has a rotatably connected adjusting ring 14, which is sleeved on the outside of the inlet pipe 1, thereby allowing the adjusting ring 14 to drive the annular plate 12 to move backward.

[0028] In this design, a fixed ring plate 17 is installed on the front side of the ring plate 12, and a fixed ring groove 18 is provided on the rear side of the adjusting ring 14. The rear end of the fixed ring plate 17 extends into the fixed ring groove 18, and the cross-sections of the fixed ring plate 17 and the fixed ring groove 18 are both T-shaped. This allows the ring plate 12 to be movably connected to the adjusting ring 14 through the engagement of the fixed ring plate 17 and the fixed ring groove 18, preventing the ring plate 12 from rotating with the adjusting ring 14. This avoids any movement obstruction between the ring plate 12 and the adjusting ring 14. As the ring plate 12 moves backward with the adjusting ring 14, the ring plate 12 can move backward along with the moving plate 10. The moving plate 10 then pushes the locking plate 6 backward through the movably connected linkage plate 9. The locking plate 6 folds along the inclined surface of the through hole 4 into the locking groove 5 inside the connecting pipe 2. The engagement of the locking plate 6 and the locking groove 5 engages the connecting pipe 2, thereby ensuring the tightness of the connection between the connecting pipe 2 and the intake pipe 1.

[0029] When disassembling the connecting tube 2, the adjusting ring 14 drives the ring plate 12 to move forward, and the ring plate 12 then drives the movable linkage plate 9 and the locking plate 6 to move backward through the moving plate 10, and separates the locking plate 6 from the locking groove 5, thereby making it easy to remove the unrestricted connecting tube 2.

[0030] At the same time, such as Figure 4 and 5 As shown, to ensure the engagement stability of the card plate 6 and the card slot 5, the moving plate 10 needs to be limited. Therefore, an internal thread 15 is machined on the inner wall of the adjusting ring 14, and an external thread 16 is machined on the outer side of the ring groove 11 corresponding to the internal thread 15. The adjusting ring 14 is threadedly connected to the ring groove 11. By setting the internal thread 15 on the adjusting ring 14 and the external thread 16 on the ring groove 11, the adjusting ring 14 is threadedly connected to the ring groove 11. Thus, while rotating and shifting the adjusting ring 14, the stability of the adjusting ring 14 can be effectively ensured, thereby avoiding the situation where the adjusting ring 14 becomes loose and causes the moving plate 10 to shift.

[0031] like Figure 3 and 4 As shown, after the connection pipe 2 and the inlet pipe 1 are assembled, the gas is transported through the connection pipe 2 to the inside of the inlet pipe 1, and then through the inlet pipe 1 to the inside of the gas chromatograph. In order to avoid impurities in the gas from contaminating the gas chromatograph, the impurities in the gas need to be filtered. Therefore, an installation hole 19 is provided at the top of the inlet pipe 1, and a filter screen 20 extending into the inlet pipe 1 is installed inside the installation hole 19. An installation plate 21 is installed at the top of the filter screen 20, and the installation plate 21 is fixed to the inlet pipe 1 by bolts.

[0032] The filter screen 20 is assembled into the air inlet pipe 1 through the mounting hole 19 using bolts on the mounting plate 21. This allows the filter screen 20 to filter the gas, facilitating the delivery of clean air to the gas chromatograph. Simultaneously, to intuitively understand the air intake status of the air inlet pipe 1, it is necessary to understand its delivery status. Therefore, a thermal mass flow meter 22 is installed on the front side of the mounting plate 21. The thermal mass flow meter 22 is installed at the top of the air inlet pipe 1, and its detection end penetrates through the air inlet pipe 1 and extends into its interior. The thermal mass flow meter 22 detects the gas flow rate within the air inlet pipe 1. Because the thermal mass flow meter 22 measures flow rate by detecting the heat exchange rate between the heating element and the surrounding gas, the sensor directly senses the gas flow state, and its response speed is typically fast, on the order of milliseconds, thus meeting the needs of real-time monitoring. This allows operators to gain a comprehensive and real-time view of the gas injection process and the continuous changes in flow rate through real-time dynamic visualization, enabling them to promptly detect various problems such as blockages and abnormal flow rates, greatly improving the accuracy and reliability of injection and significantly reducing the probability of injection failure.

[0033] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A visual gas injection system for a gas chromatograph, comprising an inlet tube (1) installed on the gas chromatograph, characterized in that: The intake pipe (1) is provided with a connecting pipe (2) at its rear end, and the intake pipe (1) is connected to the connecting pipe (2) through a connector; The connector includes an assembly tube (3) installed at the rear end of the intake pipe (1). The front side of the assembly tube (3) has multiple through holes (4) arranged in a ring array. The rear end opening of the through holes (4) extends to the outside of the rear end of the assembly tube (3). A slot (5) is provided inside the connecting tube (2) on one side corresponding to the through hole (4). A retaining plate (6) is provided inside the rear end of the through hole (4). A fixing hole (7) is provided on the front side of the retaining plate (6). A fixing post (8) is installed inside the fixing hole (7). A linkage plate (9) is provided outside the fixing post (8). A movable plate (10) is rotatably connected to the front end of the linkage plate (9). The air intake pipe (1) has an annular groove (11) on its outside, and the annular groove (11) has an adjusting component inside for driving the moving plate (10) to shift.

2. The visual gas injection system for a gas chromatograph according to claim 1, characterized in that: The adjusting component includes an annular plate (12) disposed in the annular groove (11), and the front end of the movable plate (10) passes through the air intake pipe (1) and is fixed together with the rear side of the annular plate (12). The rear end of the air intake pipe (1) is provided with a movable hole (13) on one side corresponding to the movable plate (10), and the movable plate (10) is disposed inside the movable hole (13). The front side of the ring plate (12) is provided with an adjusting ring (14) that is rotatably connected, and the adjusting ring (14) is sleeved on the outside of the air intake pipe (1).

3. The visual gas injection system for a gas chromatograph according to claim 2, characterized in that: The inner wall of the adjusting ring (14) is machined with an internal thread (15), and the outer side of the ring groove (11) corresponding to the internal thread (15) is machined with an external thread (16). The adjusting ring (14) is threadedly connected to the ring groove (11).

4. A visual gas injection system for a gas chromatograph according to claim 2, characterized in that: A fixed ring plate (17) is installed on the front side of the ring plate (12), and a fixed ring groove (18) is opened on the rear side of the adjusting ring (14). The rear end of the fixed ring plate (17) extends into the fixed ring groove (18), and the cross-section of the fixed ring plate (17) and the cross-section of the fixed ring groove (18) are both T-shaped.

5. A visual gas injection system for a gas chromatograph according to claim 1, characterized in that: The top of the air intake pipe (1) is provided with an installation hole (19), and a filter screen (20) extending into the air intake pipe (1) is installed inside the installation hole (19). An installation plate (21) is installed on the top of the filter screen (20), and the installation plate (21) is fixed to the air intake pipe (1) by bolts.

6. A visual gas injection system for a gas chromatograph according to claim 5, characterized in that: A thermal mass flow meter (22) is provided on the front side of the mounting plate (21). The thermal mass flow meter (22) is installed on the top of the air inlet pipe (1), and the detection end of the thermal mass flow meter (22) passes through the air inlet pipe (1) and extends into the interior of the air inlet pipe (1).

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