Gas source filtering device of gas chromatograph

Abstract

The utility model belongs to the technical field of filtering devices, and particularly relates to a gas chromatograph gas source filtering device which comprises an L-shaped base, a mounting sliding seat is arranged at the top of the L-shaped base, a filtering device mounting seat is mounted at the top of the mounting sliding seat, and three groups of first sockets are mounted at the top of the filtering device mounting seat. A filtering device is inserted into the top of the first socket and comprises a second socket in inserted connection with the first socket, two groups of jacks penetrate through the top and the bottom of the second socket, a first sealing gasket is arranged at the inner bottom of the first socket, and an outer protection tube is mounted at the top of the second socket; the top of the second socket is provided with a first filter element slot and a second filter element slot, an airflow filtering and top sealing mechanism is inserted into the first filter element slot and the second filter element slot, and compared with the prior art, only the internal filter element needs to be replaced while the sealing effect is not affected, so that the replacement cost is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to filter device technical field, concretely relates to a gas chromatograph gas source filter device. BACKGROUND

[0002] Gas chromatograph (GC) is an important instrument widely used in the field of chemical analysis. It is based on chromatographic separation technology, separates the difference of distribution coefficient of each component in the mixture, and uses the detector to convert the concentration or mass of each component into an electrical signal, so as to realize the qualitative and quantitative analysis of the mixture.

[0003] In the use process of the gas chromatograph, the carrier gas and detection auxiliary gas transported from the gas source to the gas chromatograph need to be filtered, which is usually carried out by a filter. In the prior art, the gas source filter device of the gas chromatograph is a tubular integral type, including a drying tube, a deoxygenation tube, a dehydrocarbon tube and the like. The structure of these filter devices includes a fixed socket at the bottom, a threaded locking sleeve outside the socket for connecting with the mounting base, a transparent outer sleeve at the top of the fixed socket, a sealing plug at the top of the transparent outer sleeve, a filter element inside the outer sleeve and the like. Due to the integral fixed design, the entire device needs to be replaced when it is replaced, resulting in high replacement cost. SUMMARY

[0004] In view of the above problems, the purpose of the utility model is to provide a gas chromatograph gas source filter device, which, compared with the prior art, only needs to replace the internal filter element without affecting the sealing effect, thereby effectively reducing the replacement cost.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a gas chromatograph gas source filter device, comprising an L-shaped base, a mounting slide is arranged at the top of the L-shaped base, a filter device mounting seat is arranged at the top of the mounting slide, three groups of first sockets are arranged at the top of the filter device mounting seat, an air inlet pipe and an air outlet pipe are respectively arranged on the first sockets at both sides, and a middle conveying pipe is connected between the two adjacent groups of first sockets, one end of the air inlet pipe and the air outlet pipe penetrates through the side surface of the filter device mounting seat, a first external thread is arranged on the outer side of the first socket, a filter device is inserted and arranged at the top of the first socket, the filter device comprises a second socket which is insertedly connected with the first socket, two groups of insertion holes are arranged through the top and bottom of the second socket, a second external thread is arranged on the outer side of the second socket, a threaded locking sleeve is threadedly arranged on the outer side of the second external thread, a first sealing gasket is arranged on the inner bottom of the first socket, an outer protective tube is arranged on the top of the second socket, a first filter element insertion slot and a second filter element insertion slot are arranged on the top of the second socket, and an airflow filtering and top sealing mechanism is inserted into the first filter element insertion slot and the second filter element insertion slot.

[0006] The beneficial effects of the utility model are: the device is provided with three groups of filtering devices with excellent sealing performance, which can avoid gas leakage and pollution by external gas, and can filter the gas well; when the first filter element and the second filter element need to be replaced, the whole filtering device does not need to be replaced, only the threaded connection between the top cover and the outer protective pipe needs to be rotated to remove the top cover, the middle transfer bin, the first filter element and the second filter element from the inside of the outer protective pipe, the bolt is pulled out, the first filter element and the second filter element are removed, new first filter element and second filter element are installed, the first filter element and the second filter element are inserted into the first filter element slot and the second filter element slot, and the threaded connection between the top cover and the outer protective pipe is screwed tightly, compared with the prior art, the sealing effect is not affected, only the internal filter element needs to be replaced, and the replacement cost is effectively reduced.

[0007] In order to facilitate the replacement and maintenance of the filtering device mounting seat above the mounting slide:

[0008] As a further improvement of the above technical solution: the top of the L-shaped base is provided with an integrally formed mounting guide rail, the bottom of the mounting slide is provided with a guide groove, the mounting slide is slidably connected with the mounting guide rail through the guide groove, a threaded hole is penetratingly arranged between the outer side of the mounting slide and the guide groove, a locking bolt is screw-mounted in the inner side of the threaded hole, and one end of the locking bolt is connected with a knob.

[0009] The beneficial effects of the improvement are: the guide groove at the bottom of the mounting slide is slidably inserted into the mounting guide rail, the locking bolt is screw-connected with the threaded hole and is tightened by rotating the knob, so that the mounting slide and the mounting guide rail are locked, when the mounting slide needs to be disassembled, the mounting slide can be removed after the locking bolt is loosened, and the replacement and maintenance of the filtering device mounting seat above the mounting slide are facilitated.

[0010] As a further improvement of the above technical solution: a mounting hole is penetratingly arranged between the top and the bottom of the first socket, between the top surface and the inner top wall of the filtering device mounting seat, and between the front surface and the inner side wall of the filtering device mounting seat, an air inlet pipe and an air outlet pipe are respectively mounted in one mounting hole on the first socket on both sides, the air inlet pipe and the air outlet pipe pass through the mounting hole on the filtering device mounting seat, and an intermediate conveying pipe is connected between the mounting holes of the two groups of adjacent first sockets, and the intermediate conveying pipe also passes through the mounting hole on the filtering device mounting seat.

[0011] In order to firmly and tightly fix the second socket on the top of the first socket:

[0012] As a further improvement of the above technical solution: the top inner side of the threaded locking sleeve is provided with an integrally formed limiting ring.

[0013] The improved beneficial effect is that the limiting ring is used for limiting the threaded locking sleeve, and when the threaded locking sleeve is tightened, the limiting ring is tightly abutted with the top surface of the second socket, so that the second socket is firmly and tightly fixed on the top of the first socket.

[0014] In order to install the filter element:

[0015] As a further improvement of the above technical solution: the airflow filtering and top sealing mechanism comprises a transfer bin connected with the first filter element slot and the second filter element slot, a plug-in seat is arranged in the transfer bin, the bottom of the plug-in seat is connected with the first filter element and the second filter element, the top inside of the outer protective pipe is screw-mounted with a top cover, the bottom of the top cover is provided with a rotary mounting groove, a connecting block is rotatably mounted on the inside of the rotary mounting groove, the bottom of the connecting block is fixedly connected with the transfer bin, plug-in holes are arranged through the side surface of the transfer bin and the side surface of the plug-in seat, and a plug-in pin is arranged in the plug-in hole.

[0016] The improved beneficial effect is that the plug-in seat at the top of the first filter element and the second filter element is connected with the transfer bin, the plug-in holes on the transfer bin and the plug-in seat are aligned, and the transfer bin and the plug-in seat are fixed by using the plug-in pin, then the first filter element and the second filter element are respectively inserted into the first filter element slot and the second filter element slot, and the top cover is screw-connected with the outer protective pipe, in this process, the rotary mounting groove and the connecting block rotate relative to each other, which does not affect the rotation of the top cover and the action that the transfer bin continues to descend into the outer protective pipe along with the top cover, and the assembly of the device is completed by tightening the top cover, along with the tightening of the top cover, the bottom of the first filter element and the second filter element is tightly abutted with the third sealing pad, and the transfer bin is tightly abutted with the fourth sealing pad, which effectively improves the sealing effect.

[0017] In order to seal the joint between the inner support seat and the first filter element and the second filter element:

[0018] As a further improvement of the above technical solution: the inside of the first filter element slot and the second filter element slot is provided with an inner support seat, and the top of the inner support seat is provided with a third sealing pad.

[0019] The improved beneficial effect is that the third sealing pad is used for sealing the joint between the inner support seat and the first filter element and the second filter element.

[0020] In order to seal the joint between the first filter element slot, the second filter element slot and the transfer bin:

[0021] As a further improvement of the above technical solution: the top of the first filter element slot and the second filter element slot is provided with a fourth sealing pad.

[0022] The improved beneficial effect is that the fourth sealing pad is used for sealing the joint between the first filter element slot, the second filter element slot and the transfer bin.

[0023] In order to make the air flow into and out of the first filter cartridge slot and the second filter cartridge slot:

[0024] As a further improvement of the above technical solution: the inner part of the two groups of the socket is respectively fixed with an input pipe and an output pipe, and the bottom of the first filter cartridge slot and the second filter cartridge slot is respectively connected with the input pipe and the output pipe.

[0025] The beneficial effects of the improvement are that the input pipe and the output pipe are respectively used for air inflow into the first filter cartridge slot and air outflow from the second filter cartridge slot.

[0026] The parts not involved in the device are the same as or can be realized by the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a front isometric structure schematic view of the utility model;

[0028] Figure 2 It is a back isometric schematic view of the utility model;

[0029] Figure 3 It is a local section schematic view of the utility model;

[0030] Figure 4 It is a local side structure schematic view of the utility model;

[0031] Figure 5 It is a local section schematic view of the utility model;

[0032] Figure 6 It is a local isometric schematic view of the filter device in the utility model;

[0033] Figure 7 It is a mounting structure schematic view of the first filter cartridge and the second filter cartridge in the utility model;

[0034] Figure 8 It is an isometric mounting structure schematic view of the first filter cartridge and the second filter cartridge in the utility model;

[0035] Figure 9 It is a connection schematic view of the first socket and the second socket in the utility model;

[0036] In the diagram: 1. L-shaped base; 2. Mounting rail; 3. Mounting slide; 4. Guide groove; 5. Threaded hole; 6. Locking bolt; 7. Knob; 8. Filter device mounting base; 9. First socket; 10. Inlet pipe; 11. Intermediate conveying pipe; 12. Exhaust pipe; 13. First external thread; 14. Filter device; 15. Second socket; 16. Insertion hole; 17. Second external thread; 18. Threaded locking sleeve; 19. Limiting ring; 20. First sealing gasket; 21. Input pipe; 22. Output pipe; 23. Outer protective pipe; 24. First filter element slot; 25. Second filter element slot; 26. Inner support base; 27. First filter element; 28. Second filter element; 29. ​​Third sealing gasket; 30. Fourth sealing gasket; 31. Transfer chamber; 32. Top cover; 33. Rotating mounting groove; 34. Connecting block; 35. Insertion socket; 36. Pin. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0038] like Figures 1-9 As shown, a gas source filtration device for a gas chromatograph includes an L-shaped base 1. A mounting slide 3 is provided on the top of the L-shaped base 1. A filter device mounting base 8 is mounted on the top of the mounting slide 3. Three sets of first sockets 9 are mounted on the top of the filter device mounting base 8. An inlet pipe 10 and an exhaust pipe 12 are respectively mounted on the first sockets 9 on both sides. An intermediate delivery pipe 11 connects adjacent sets of first sockets 9. One end of the inlet pipe 10 and the exhaust pipe 12 extends through the side of the filter device mounting base 8. A first external thread 13 is provided on the outer side of the first socket 9. A filter device 14 is inserted and installed on the top of the first socket 9. The filter device 14 includes a second socket 15 that is inserted and connected to the first socket 9. Two sets of insertion holes 16 are passed through the top and bottom of the second socket 15. The second socket 15 has a second external thread 17 on its outer side. A threaded locking sleeve 18 is installed on the outer thread of the second external thread 17. A first sealing gasket 20 is provided at the inner bottom of the first socket 9. An outer protective tube 23 is installed at the top of the second socket 15. A first filter element slot 24 and a second filter element slot 25 are installed at the top of the second socket 15. An airflow filtration and top sealing mechanism is inserted inside the first filter element slot 24 and the second filter element slot 25.

[0039] The device avoids gas leakage and pollution by the external gas through the setting of three groups of filtering devices 14 with excellent sealing performance, and can well filter the gas. When the first filter element 27 and the second filter element 28 need to be replaced, the device also does not need to replace the entire filtering device 14, only needs to rotate the top cover 32 to remove the threaded connection between the top cover 32 and the outer protective pipe 23, and then the top cover 32, the intermediate transfer bin 31, the first filter element 27 and the second filter element 28 can be taken out from the inside of the outer protective pipe 23. The first filter element 27 and the second filter element 28 can be taken down by pulling out the bolt 36. After installing the new first filter element 27 and the second filter element 28, the first filter element 27 and the second filter element 28 are inserted into the first filter element slot 24 and the second filter element slot 25, and the top cover 32 is screwed and connected with the outer protective pipe 23. Compared with the prior art, the replacement cost is effectively reduced.

[0040] The top of the L-shaped base 1 is provided with an integrally formed mounting guide rail 2, the bottom of the mounting sliding seat 3 is provided with a guide groove 4, the mounting sliding seat 3 is slidably connected with the mounting guide rail 2 through the guide groove 4, a threaded hole 5 is provided between the outer side of the mounting sliding seat 3 and the guide groove 4, a locking bolt 6 is screw-mounted in the inner side of the threaded hole 5, and one end of the locking bolt 6 is connected with a knob 7.

[0041] The guide groove 4 at the bottom of the mounting sliding seat 3 is slidably inserted into the mounting guide rail 2, the locking bolt 6 is screw-connected with the threaded hole 5, and the locking bolt 6 is tightened by rotating the knob 7, so that the mounting sliding seat 3 is locked with the mounting guide rail 2. When the mounting sliding seat 3 needs to be disassembled, the mounting sliding seat 3 can be taken down after the locking bolt 6 is loosened, so that the replacement and maintenance of the filtering device mounting seat 8 above the mounting sliding seat 3 are facilitated.

[0042] Mounting holes are provided between the top and the bottom of the first socket 9, between the top surface and the inner top wall of the filtering device mounting seat 8, and between the front surface of the filtering device mounting seat 8 and the inner side wall of the filtering device mounting seat 8. An air inlet pipe 10 and an exhaust pipe 12 are respectively mounted in one mounting hole on the first socket 9 on both sides, the air inlet pipe 10 and the exhaust pipe 12 pass through the mounting holes in the filtering device mounting seat 8, and an intermediate conveying pipe 11 is connected between the mounting holes of the two adjacent groups of first sockets 9. The intermediate conveying pipe 11 also passes through the mounting holes in the filtering device mounting seat 8.

[0043] The top inner side of the threaded locking sleeve 18 is provided with an integrally formed limiting ring 19.

[0044] The limiting ring 19 is used for limiting the threaded locking sleeve 18. When the threaded locking sleeve 18 is tightened, the limiting ring 19 abuts against the top surface of the second socket 15, so that the second socket 15 is firmly and tightly fixed on the top of the first socket 9.

[0045] The air flow filtering and top closing mechanism comprises a transfer bin 31 connected with the first filter core slot 24 and the second filter core slot 25, a plug-in seat 35 is arranged in the transfer bin 31, the first filter core 27 and the second filter core 28 are connected to the bottom of the plug-in seat 35, a top cover 32 is threadedly arranged on the top inner side of the outer protection tube 23, a rotating installation groove 33 is arranged on the bottom of the top cover 32, a connecting block 34 is rotatably arranged on the inner side of the rotating installation groove 33, the bottom of the connecting block 34 is fixedly connected with the transfer bin 31, and the side of the transfer bin 31 and the side of the plug-in seat 35 are both provided with a bolt hole, and a bolt 36 is arranged in the bolt hole.

[0046] The plug-in seat 35 on the top of the first filter core 27 and the second filter core 28 is connected with the transfer bin 31, the bolt holes on the transfer bin 31 and the plug-in seat 35 are aligned, the transfer bin 31 and the plug-in seat 35 are fixed by the bolt 36, then the first filter core 27 and the second filter core 28 are respectively inserted into the first filter core slot 24 and the second filter core slot 25, and the top cover 32 is threadedly connected with the outer protection tube 23, in this process, the rotating installation groove 33 and the connecting block 34 are rotatable, which does not affect the rotation of the top cover 32 and the descending of the transfer bin 31 into the outer protection tube 23, the top cover 32 is tightened to complete the assembly of the device, with the tightening of the top cover 32, the bottom of the first filter core 27 and the second filter core 28 is tightly pressed against the third sealing pad 29, and the transfer bin 31 is tightly pressed against the fourth sealing pad 30, which effectively improves the sealing effect.

[0047] The first filter core slot 24 and the second filter core slot 25 are provided with an inner support seat 26, and the top of the inner support seat 26 is provided with a third sealing pad 29.

[0048] The third sealing pad 29 is used for sealing the joint between the inner support seat 26 and the first filter core 27 and the second filter core 28.

[0049] The top of the first filter core slot 24 and the second filter core slot 25 is provided with a fourth sealing pad 30.

[0050] The fourth sealing pad 30 is used for sealing the joint between the first filter core slot 24, the second filter core slot 25 and the transfer bin 31.

[0051] The inner sides of the two groups of plug holes 16 are respectively fixedly inserted with an input pipe 21 and an output pipe 22, and the bottoms of the first filter core slot 24 and the second filter core slot 25 are respectively connected with the input pipe 21 and the output pipe 22.

[0052] The input pipe 21 and the output pipe 22 are respectively used for air flow into the first filter core slot 24 and air flow out of the second filter core slot 25.

[0053] The utility model discloses a working principle and use flow: the device uses, the guide slot 4 of installing slide 3 bottom is inserted to the installation guide rail 2 to its back slide, and uses locking bolt 6 and screw hole 5 screw connection and passes through knob 7 rotation locking bolt 6 and is screwed tightly, to lock between installing slide 3 and installation guide rail 2, complete locking, install filter device 14 on the top of first socket 9, when installing, the second socket 15 is inserted between first socket 9 and connects, makes the top of air inlet pipe 10, intermediate delivery pipe 11, exhaust pipe 12 and second socket 15 on the jack 16 butt joint insertion, then can rotate screw locking sleeve 18, make screw locking sleeve 18 to first external thread 13, second external thread 17 carry out screw connection, screw locking sleeve 18 is screwed tightly to the top of limiting ring 19 and second socket 15 and is pressed tightly, to tightly fixed second socket 15 on the top of first socket 9, and make second socket 15 to first sealing pad 20 carry out pressure tightly, improve the contact close degree between first sealing pad 20 and second socket 15, and then improve the sealing property between first socket 9, second socket 15, then first filter core 27, second filter core 28 top's plug-in seat 35 and transfer warehouse 31 are inserted between connection, make transfer warehouse 31, plug-in seat 35 on the bolt hole alignment, and use the bolt 36 to fix between transfer warehouse 31, plug-in seat 35, then can first filter core 27, second filter core 28 are respectively with first filter core slot 24, second filter core slot 25 alignment insertion, and the top cover 32 and outer protection pipe 23 carry out screw connection, in this process, the mutual rotation between installation groove 33, connecting block 34 does not affect the rotation of top cover 32 and the action that transfer warehouse 31 continues to drop along with top cover 32 is screwed into outer protection pipe 23, and screwing top cover 32 can complete the assembly of the device, along with the screwing of top cover 32, first filter core 27, second filter core 28 bottom and third sealing pad 29 press tightly, and transfer warehouse 31 is pressed tightly between fourth sealing pad 30, effectively improve the sealing effect, when sending gas, the air inlet pipe 10 on the two groups of filter device mounting seat 8 on L-shaped base 1 is connected with the gas source pipeline of detection's carrier gas and auxiliary gas respectively, the exhaust pipe 12 on the two groups of filter device mounting seat 8 is connected with the carrier gas input pipeline and auxiliary gas input pipeline of gas chromatograph respectively, can start sending gas, the gas source delivery gas enters first filter core slot 24 in first filter device 14 through air inlet pipe 10, enters transfer warehouse 31 after filtering through first filter core 27 in first filter core slot 24, then enters second filter core slot 25 and carries out second filtering again through second filter core 28, then enters next group filter device 14 through intermediate delivery pipe 11, enters last group filter device 14 after passing through the same filtering process, completes the last filtering and is inputted into gas chromatograph through exhaust pipe 12, through the setting of three groups of filter devices 14 with excellent sealing property, avoid gas leakage and pollution by external gas, can filter gas well, when needing to replace first filter core 27, second filter core 28,The device also does not need to replace the whole filter device 14, only need to rotate the top cover 32 to remove the threaded connection between the top cover 32 and the outer protective tube 23, that is, the top cover 32 together with the transfer bin 31, the first filter element 27 and the second filter element 28 can be taken out from the inside of the outer protective tube 23, the bolt 36 is pulled out, the first filter element 27 and the second filter element 28 can be removed, after installing the new first filter element 27 and the second filter element 28, the first filter element 27 and the second filter element 28 are inserted into the first filter element slot 24 and the second filter element slot 25, and the threaded connection between the top cover 32 and the outer protective tube 23 is reconnected and tightened, compared with the prior art, the replacement cost is effectively reduced.

[0054] It should be noted that in this document, the terms "comprise", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such processes, methods, articles or devices.

[0055] The principle and implementation mode of the present application are described by applying specific examples in this document, and the above examples are only used to help understand the method and its core idea. The above description is only the preferred embodiment of the present application, it should be pointed out that due to the limited expression, there are infinite specific structures objectively, for ordinary skilled in the art, without departing from the principle of the present application, some improvements, decorations or changes can be made, the above technical features can also be combined in appropriate way, these improvements, decorations, changes or combinations, or without improvement, the concept and technical scheme of the present application are directly applied to other occasions, should be regarded as the protection scope of the present application.

Claims

1. A gas chromatograph gas supply filtration device, characterized by: The utility model provides a filter device, including L type base (1), the top of L type base (1) is equipped with the installation slide (3), the top of installation slide (3) is equipped with filter device mounting seat (8), the top of filter device mounting seat (8) is equipped with three groups of first socket (9), the first socket (9) on both sides is equipped with air inlet pipe (10) respectively, exhaust pipe (12), the adjacent two groups of first socket (9) between connecting have intermediate delivery pipe (11), air inlet pipe (10), exhaust pipe (12) one end penetrates out filter device mounting seat (8) side, the outside of first socket (9) is equipped with first external thread (13), the top of first socket (9) is inserted and is equipped with filter device (14), filter device (14) includes with the second socket (15) of first socket (9) insertion connection, the top and bottom of second socket (15) are penetrated two groups of jack (16), the outside of second socket (15) is equipped with second external thread (17), the outside of second external thread (17) is equipped with threaded locking sleeve (18), the inner bottom of first socket (9) is equipped with first sealing pad (20), the top of second socket (15) is equipped with outer protection pipe (23), the top of second socket (15) is equipped with first filter core slot (24), second filter core slot (25), the inside insertion of first filter core slot (24), second filter core slot (25) has airflow filtration and top closure mechanism.

2. A gas chromatograph gas supply filter apparatus as defined in claim 1, wherein: The top of L type base (1) is equipped with the integral mounting guide rail (2) of forming, the bottom of installation slide (3) is equipped with guide groove (4), installation slide (3) is connected through guide groove (4) with mounting guide rail (2) sliding, the outside of installation slide (3) and guide groove (4) are penetrated and are equipped with threaded hole (5), the inside screwing of threaded hole (5) is equipped with locking bolt (6), one end of locking bolt (6) is connected with knob (7).

3. The gas chromatograph gas supply filter of claim 1, wherein: The top and bottom of first socket (9), the top surface and inner top wall of filter device mounting seat (8), the front surface of filter device mounting seat (8) and the inner side wall of filter device mounting seat (8) are all penetrated and are equipped with mounting hole, the inside of one mounting hole on the first socket (9) on both sides is equipped with air inlet pipe (10), exhaust pipe (12) respectively, air inlet pipe (10), exhaust pipe (12) pass through the mounting hole on filter device mounting seat (8), the mounting hole between the adjacent two groups of first socket (9) is connected with intermediate delivery pipe (11), intermediate delivery pipe (11) also passes through the mounting hole on filter device mounting seat (8).

4. The gas chromatograph gas supply filter of claim 1, wherein: The top inside of threaded locking sleeve (18) is equipped with the integral limiting ring (19) of forming.

5. The gas chromatograph gas supply filter of claim 1, wherein: The air flow filtering and top closing mechanism comprises a transfer bin (31) insertedly connected with the first filter core insertion slot (24) and the second filter core insertion slot (25), an insertion socket (35) is installed inside the transfer bin (31), the bottom of the insertion socket (35) is connected with the first filter core (27) and the second filter core (28), the top inside of the outer protection pipe (23) is screwedly installed with a top cover (32), the bottom of the top cover (32) is provided with a rotary installation slot (33), the inside of the rotary installation slot (33) is rotatably installed with a connecting block (34), the bottom of the connecting block (34) is fixedly connected with the transfer bin (31), the side surface of the transfer bin (31) and the side surface of the insertion socket (35) are both provided with a bolt hole, and a bolt (36) is insertedly installed in the bolt hole.

6. A gas chromatograph gas supply filter as defined in claim 1, wherein: The inside of the first filter core insertion slot (24) and the second filter core insertion slot (25) is provided with an inner support seat (26), and the top of the inner support seat (26) is provided with a third sealing gasket (29).

7. A gas chromatograph gas supply filter as defined in claim 1, wherein: The top of the first filter core insertion slot (24) and the second filter core insertion slot (25) is provided with a fourth sealing gasket (30).

8. The gas chromatograph gas supply filter of claim 1, wherein: The inside of the two groups of insertion holes (16) is respectively fixedly inserted with an input pipe (21) and an output pipe (22), and the bottom of the first filter core insertion slot (24) and the second filter core insertion slot (25) is respectively connected with the input pipe (21) and the output pipe (22).

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