A gas chromatograph with a gas filter structure

Abstract

The utility model discloses a gas chromatograph with gas filter structure, including gas chromatograph body and the gas filter component of setting at the air inlet of gas chromatograph body, the air inlet of gas chromatograph body is equipped with the air inlet pipe, the air inlet pipe's far away from the one end of gas chromatograph body detachable connection has the first connecting pipe, the gas filter component sets up at the one end of first connecting pipe far away from the air inlet pipe. The gas chromatograph with gas filter structure provided by the utility model can effectively solve the problems that the gas source needs to be closed first, the end cover or joint of filter structure is disassembled, the filter cartridge with dust accumulated inside is taken out and the overall work efficiency of laboratory is seriously affected when cleaning the gas chromatograph.

Description

Technical Field

[0001] This utility model relates to the field of gas chromatography technology, and in particular to a gas chromatograph with a gas filtration structure. Background Technology

[0002] Gas chromatographs are precision analytical instruments widely used in environmental monitoring, food safety, petrochemicals, and pharmaceutical analysis. Their working principle utilizes the difference in partition coefficients between the mobile and stationary phases of a sample, resulting in repeated partitioning between the two phases, thus separating the components and allowing them to enter the detector sequentially for qualitative and quantitative analysis. Existing gas chromatographs typically have a gas filter structure at the gas inlet, usually filled with adsorbents such as molecular sieves, silica gel, or activated carbon to adsorb and remove various impurities from the carrier gas. However, this traditional filter structure has a significant drawback in practical use: as the volume of gas processed accumulates, the adsorbent inside the filter gradually becomes saturated, and a large amount of captured dust and impurities accumulate on its surface and in the internal pores, causing increased gas path resistance, unstable gas flow, and ultimately affecting the performance of chromatographic analysis.

[0003] The existing operating procedure is as follows: staff need to first shut off the gas source, disassemble the end cap or connector of the filter structure, take out the filter cartridge that has accumulated dust inside, clean and dry it, and then reassemble it back into the gas path. However, the frequent disassembly and cleaning operations force the instrument to stop operating and wait for the gas purification system to be restored. For high-throughput laboratories that need to continuously analyze samples, each shutdown means a delay in the analysis task and a reduction in the effective utilization rate of the instrument, which seriously affects the overall work efficiency of the laboratory. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a gas chromatograph with a gas filtration structure, which can effectively solve the problems of having to shut off the gas source, disassemble the end cap or connector of the filter structure to remove the filter cartridge with accumulated dust during cleaning of the gas chromatograph, and seriously affect the overall working efficiency of the laboratory.

[0005] The technical solution provided by this utility model is as follows: A gas chromatograph with a gas filtration structure includes a gas chromatograph body and a gas filtration assembly disposed at the gas inlet of the gas chromatograph body. The gas chromatograph body is provided with an air inlet pipe at the air inlet, and a first connecting pipe is detachably connected to the end of the air inlet pipe away from the gas chromatograph body. The gas filter assembly is located at the end of the first connecting pipe away from the air inlet pipe. The first connecting pipe adopts a detachable design, so that if the gas filter assembly fails, it can be disassembled independently, making it convenient for staff to maintain it, which is a design redundancy.

[0006] Preferably, the gas filtration assembly includes a cylindrical body connected to the first connecting pipe. A movable disc is rotatably connected to the end of the cylinder away from the first connecting pipe. An internal gear ring is fixedly mounted on the movable disk, and a protective shell for covering the internal gear ring is detachably connected to the movable disk. A servo motor is mounted on the protective shell, and a drive gear for meshing with an internal gear ring is fixedly mounted on the output end of the servo motor. A mounting bracket for connecting to a servo motor base is fixedly installed on the cylinder body, and a gas filter cartridge is installed inside the cylinder body. An air guide tube for fixed connection with the movable disc is provided at the air inlet of the cylinder, and the air guide tube passes through the gas filter cylinder.

[0007] Compared to traditional filter components, the gas filter component of this application can clean the dust and particulate matter accumulated on the inner wall of the gas filter cartridge during equipment operation, preventing blockage of the gas filter cartridge. The rotating brush roller cleans in real time, ensuring the long-term efficient operation of the filter cartridge.

[0008] Preferably, a sealing gasket is provided at the connection between the air guide tube and the gas filter tube.

[0009] Preferably, a collar is fixedly installed on the side of the movable disc away from the air guide cylinder. A second connecting pipe is fitted onto the collar. The second connecting pipe is used to connect to an external gas guiding device. The second connecting pipe adopts a detachable design. If the gas filter component fails, it can be disassembled independently, which is convenient for staff to maintain it. This design is redundant.

[0010] Preferably, the air guide cylinder has several brush rollers arranged in a ring shape inside. The brush of the brush roller intersects with the inner wall of the gas filter cylinder.

[0011] Preferably, the brush roller is in the shape of a round rod, and the length of the brush roller is adapted to the length of the inner wall of the gas filter cylinder.

[0012] Preferably, the brush rollers are in six groups, and the brush rollers are evenly distributed in a ring along the inside of the air guide tube and cover the inner wall of the gas filter tube at 60°.

[0013] Preferably, a connecting rod is fixedly installed at one end of the brush roller near the air guide cylinder. One end of the connecting rod is fixedly connected to the outer surface of the air guide cylinder.

[0014] Preferably, an assembly box is inserted into the lower end of the cylinder. The lower end of the gas filter cartridge has a notch. The assembly box has an arc-shaped groove that matches the circumference of the gas filter cartridge. A dust collection box is movably connected to the assembly box.

[0015] Preferably, a handle is fixedly installed on the dust collection box.

[0016] This invention has the following advantages over the prior art: This utility model of a gas chromatograph with a gas filtration structure ensures that the gas entering the gas chromatograph is clean by setting a first connecting pipe and a gas filtration assembly. It also effectively solves the problem of having to shut off the gas source, disassemble the end cap or connector of the filter structure to remove the filter cartridge with accumulated dust during cleaning, which seriously affects the overall work efficiency of the laboratory. In the gas filtration assembly, the cylinder houses the gas filter cartridge, and a movable disc is connected to the gas guide tube and can rotate relative to the cylinder. A protective shell encloses an inner gear ring and a servo motor. The servo motor drives the gear to mesh with the inner gear ring, causing the movable disc and gas guide tube to rotate. A brush contacts and rubs against the inner wall of the gas filter cartridge, sweeping away the dust and particles accumulated on the inner wall of the gas filter cartridge, preventing blockage. The rotating brush roller cleans in real time, ensuring the filter cartridge operates efficiently for a long time. The assembly box at the lower end of the cylinder is fitted with a recess at the lower end of the gas filter cartridge via an arc groove. The dust swept by the brush roller falls into a dust collection box inside the assembly box, which can be pulled out by a handle for convenient cleaning of accumulated dust. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the gas chromatograph with a gas filtration structure in an embodiment of this utility model; Figure 2 This is a structural schematic diagram of the cross-sectional view of the cylinder in an embodiment of this utility model; Figure 3 This is a structural schematic diagram of the front cross-section of the cylinder in an embodiment of the present invention; Figure 4 This is a schematic diagram of the dust collection box in an embodiment of the present utility model.

[0019] Figure label: 1. Gas chromatograph body; 2. Inlet pipe; 3. First connecting pipe; 4. Gas filter assembly; 41. Cylinder; 42. Movable disc; 43. Protective shell; 44. Fixing frame; 45. Servo motor; 46. Internal gear ring; 47. Gas filter cartridge; 48. Gas guide tube; 481. Brush roller; 482. Connecting rod; 5. Second connecting pipe; 6. Assembly box; 61. Handle; 62. Dust collection box. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 1-4 As shown, this utility model embodiment provides a gas chromatograph with a gas filtration structure, including a gas chromatograph body 1 and a gas filter assembly 4 disposed at the gas inlet of the gas chromatograph body 1. The gas inlet of the gas chromatograph body 1 is provided with an inlet pipe 2. A first connecting pipe 3 is detachably connected to the end of the inlet pipe 2 away from the gas chromatograph body 1. The gas filter assembly 4 is disposed at the end of the first connecting pipe 3 away from the inlet pipe.

[0022] In this embodiment, the gas filter assembly 4 includes a cylinder 41 connected to the first connecting pipe 3. A movable disk 42 is rotatably connected to one end of the cylinder 41 away from the first connecting pipe 3. An internal gear ring 46 is fixedly installed on the movable disk 42. A protective shell 43 for shielding the internal gear ring 46 is detachably connected to the movable disk 42. A servo motor 45 is installed on the protective shell 43. A drive gear for meshing with the internal gear ring 46 is fixedly installed at the output end of the servo motor 45. A fixing bracket 44 for connecting to the base of the servo motor 45 is fixedly installed on the cylinder 41. A gas filter cylinder 47 is provided inside the cylinder 41. An air guide cylinder 48 for fixed connection with the movable disk 42 is provided at the air inlet of the cylinder 41. The air guide cylinder 48 and the gas filter cylinder 47 pass through each other.

[0023] In this embodiment, a sealing gasket is provided at the connection between the gas guide tube 48 and the gas filter tube 47 to ensure that the gas is filtered only through the gas filter tube 47. The sealing gasket is made of fluororubber, and the gas filter tube 47 is made of polytetrafluoroethylene filter element.

[0024] In this embodiment, a collar is fixedly installed on the side of the movable disc 42 away from the gas guide cylinder 48, and a second connecting pipe 5 is fitted onto the collar. More specifically, the collar on the movable disc 42 fits into the second connecting pipe 5 to achieve the introduction connection of unfiltered gas. When the movable disc 42 rotates, the collar rotates with it, and the second connecting pipe 5 maintains its connection with the movable disc 42 through the fitting structure, ensuring that the gas is stably introduced into the cylinder 41.

[0025] In this embodiment, a plurality of brush rollers 481 are arranged in a ring inside the air guide cylinder 48, and the brushes of the brush rollers 481 intersect with the inner wall of the gas filter cylinder 47. The brush rollers 481 are cylindrical rods, and their lengths are adapted to the length of the inner wall of the gas filter cylinder 47. There are six groups of brush rollers 481, which are evenly distributed in a ring inside the air guide cylinder 48 and cover the inner wall of the gas filter cylinder 47 at a 60° angle. The air guide cylinder 48 has a ring of brush rollers 481 inside. The air guide cylinder 48 is driven to rotate by the movable disc 42. The brush rollers 481 contact and rub against the inner wall of the gas filter cylinder 47, cleaning the dust and particles accumulated on the inner wall of the gas filter cylinder 47 and preventing blockage. The rotating brush rollers 481 clean in real time, ensuring the long-term efficient operation of the filter cylinder. The brush rollers 481 are made of nylon brushes with moderate hardness, which will not damage the inner wall of the gas filter cylinder 47. A single cleaning can remove more than 90% of the dust accumulated on the inner wall. The rotation speed of the air guide cylinder 48 is adjusted by the servo motor 45 to adapt to different dust accumulation levels. The cleaning process does not affect the normal filtration of gas.

[0026] In this embodiment, a connecting rod 482 is fixedly installed at one end of the brush roller 481 near the air guide cylinder 48, and one end of the connecting rod 482 is fixedly connected to the outer surface of the air guide cylinder 48. The brush roller 481 is fixedly connected to the outer surface of the air guide cylinder 48 through the connecting rod 482, and the connecting rod 482 provides radial support for the brush roller 481, ensuring that the brush roller 481 is stable in position during rotation cleaning and maintains a constant contact pressure with the inner wall of the gas filter cylinder 47.

[0027] In this embodiment, an assembly box 6 is inserted into the lower end of the cylinder 41, and a notch is provided at the lower end of the gas filter cylinder 47. An arc-shaped groove adapted to the circumference of the gas filter cylinder 47 is provided on the assembly box 6. A dust collection box 62 is movably connected to the assembly box 6, collecting accumulated dust for regular cleaning and ensuring the cleanliness of the equipment's interior. A handle 61 is fixedly installed on the dust collection box 62 for easy operation. The assembly box 6 at the lower end of the cylinder 41 is adapted to the notch at the lower end of the gas filter cylinder 47 via the arc-shaped groove. Dust swept by the brush roller 481 falls into the dust collection box 62 inside the assembly box 6. The dust collection box 62 can be pulled out using the handle 61 for convenient cleaning of accumulated dust.

[0028] In this embodiment, the gas chromatograph with a gas filtration structure is used. The gas chromatograph body 1 is the core detection unit. The gas inlet pipe 2 and the first connecting pipe 3 introduce gas. In the gas filtration assembly 4, the cylinder 41 houses the gas filter cylinder 47. The movable disk 42 is connected to the gas guide cylinder 48 and can rotate relative to the cylinder 41. The protective shell 43 encloses the inner gear ring 46 and the servo motor 45. The servo motor 45 drives the gear to mesh with the inner gear ring 46, which drives the movable disk 42 and the gas guide cylinder 48 to rotate. The brush contacts and rubs against the inner wall of the gas filter cylinder 47 to clean the dust and particles accumulated on the inner wall of the filter cylinder, preventing the filter cylinder from being blocked. The rotating brush roller 481 cleans in real time, ensuring that the filter cylinder works efficiently for a long time.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas chromatograph with a gas filtration structure, characterized in that, Includes the gas chromatograph body and a gas filter assembly located at the gas inlet of the gas chromatograph body. The gas chromatograph body is provided with an air inlet pipe at the air inlet, and a first connecting pipe is detachably connected to the end of the air inlet pipe away from the gas chromatograph body. The gas filter assembly is located at the end of the first connecting pipe furthest from the air inlet pipe.

2. The gas chromatograph with a gas filtration structure according to claim 1, characterized in that, The gas filtration assembly includes a cylindrical body connected to a first connecting pipe. A movable disc is rotatably connected to the end of the cylinder away from the first connecting pipe. An internal gear ring is fixedly mounted on the movable disk, and a protective shell for covering the internal gear ring is detachably connected to the movable disk. A servo motor is mounted on the protective shell, and a drive gear for meshing with an internal gear ring is fixedly mounted on the output end of the servo motor. A mounting bracket for connecting to a servo motor base is fixedly installed on the cylinder body, and a gas filter cartridge is installed inside the cylinder body. An air guide tube for fixed connection with the movable disc is provided at the air inlet of the cylinder, and the air guide tube passes through the gas filter cylinder.

3. The gas chromatograph with a gas filtration structure according to claim 2, characterized in that, A sealing gasket is provided at the connection between the air guide tube and the gas filter tube.

4. The gas chromatograph with a gas filtration structure according to claim 2, characterized in that, A collar is fixedly installed on the side of the movable disc away from the air guide cylinder. A second connecting pipe is fitted onto the collar.

5. The gas chromatograph with a gas filtration structure according to claim 2, characterized in that, The air guide cylinder has several brush rollers arranged in a ring inside. The brush of the brush roller intersects with the inner wall of the gas filter cylinder.

6. The gas chromatograph with a gas filtration structure according to claim 5, characterized in that, The brush roller is in the shape of a round rod, and its length is adapted to the length of the inner wall of the gas filter cylinder.

7. The gas chromatograph with a gas filtration structure according to claim 5, characterized in that, The brush rollers consist of six groups, which are evenly distributed in a ring along the inside of the air guide tube and cover the inner wall of the gas filter tube at a 60° angle.

8. The gas chromatograph with a gas filtration structure according to claim 5, characterized in that, A connecting rod is fixedly installed at one end of the brush roller near the air guide cylinder. One end of the connecting rod is fixedly connected to the outer surface of the air guide cylinder.

9. The gas chromatograph with a gas filtration structure according to any one of claims 2-8, characterized in that, An assembly box is inserted into the lower end of the cylinder. The lower end of the gas filter cartridge has a notch. The assembly box has an arc-shaped groove that matches the circumference of the gas filter cartridge. A dust collection box is movably connected to the assembly box.

10. The gas chromatograph with a gas filtration structure according to claim 9, characterized in that, A handle is fixedly installed on the dust collection box.

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