阅读说明：本技术 气相色谱仪液体进样系统 (Liquid sample introduction system of gas chromatograph ) 是由 郭廷富 于 2020-06-17 设计创作，主要内容包括：本发明公开一种气相色谱仪液体进样系统,涉及气相色谱仪进样系统技术领域,包括：相连通的液体定量进样装置和液体气化装置,使用过程中液体定量进样装置向液体气化装置定量输送液体,液体气化装置将液体定量进样装置输送的定量液体气化,并将气化后的气体输送至色谱柱进行分析。通过设置该气相色谱仪液体进样系统,气相色谱仪能够对液体样品进行分析。(The invention discloses a liquid sample introduction system of a gas chromatograph, which relates to the technical field of sample introduction systems of gas chromatographs and comprises the following components: the liquid quantitative sampling device quantitatively conveys liquid to the liquid gasification device in the using process, the liquid gasification device gasifies the quantitative liquid conveyed by the liquid quantitative sampling device and conveys the gasified gas to the chromatographic column for analysis. Through setting up this gas chromatograph liquid sampling system, gas chromatograph can carry out the analysis to liquid sample.)

1. A gas chromatograph liquid sampling system, its characterized in that includes:

liquid ration sampling device, it includes power device, valve body, valve rod, valve clack, valve head and ration ring, the inside of valve body is provided with and link up the chamber that link up of valve body top and bottom, the valve clack rotationally set up in link up the intracavity, the one end of valve rod certainly the valve body bottom stretches into link up the intracavity and with the valve clack transmission is connected, the other end of valve rod with the power device transmission is connected, power device is used for the drive the valve rod rotates, the valve clack is kept away from the one end circumference of valve rod has set gradually first intercommunication groove, second intercommunication groove and third intercommunication groove, the valve head set up in the top of valve body, follow on the valve head the circumference of valve head has set gradually introduction passageway, carrier gas passageway, first ration ring passageway, emptying passageway, sampling passageway and second ration ring passageway, the ration ring the both ends respectively with first ration ring passageway and the second ration ring passageway links to each other The sampling channel is communicated with a liquid sample, the carrier gas channel is communicated with a carrier gas source, the emptying channel is communicated with the outside air, the sampling channel is communicated with the first quantitative ring channel through the first communicating groove in a first state, the sampling channel is communicated with the carrier gas channel through the second communicating groove, the second quantitative ring channel is communicated with the emptying channel through the third communicating groove, the first quantitative ring channel is communicated with the sampling channel through the first communicating groove in a second state, the carrier gas channel is communicated with the second quantitative ring channel through the second communicating groove, and the emptying channel is communicated with the sampling channel through the third communicating groove;

liquid gasification equipment, it includes heat preservation shell, advances kind interface, gasification nest of tubes, play kind interface, reposition of redundant personnel interface and heating device, the inside heating chamber that is provided with of heat preservation shell, heating device set up in the heating chamber, gasification nest of tubes runs through heat preservation shell's top and bottom, just gasification nest of tubes runs through the heating chamber, gasification nest of tubes includes from interior to exterior nested first gasification pipe and the second gasification pipe that sets up, just first gasification pipe with be formed with the clearance layer between the second gasification pipe, the top of first gasification pipe with the bottom of advancing kind interface is linked together, the bottom of first gasification pipe is higher than the bottom of second gasification pipe, the bottom of second gasification pipe with the top of going out kind interface is linked together, the top shutoff of clearance layer, reposition of redundant personnel interface set up on the lateral wall of second gasification pipe and with the clearance layer is linked together, the top of appearance interface is linked together with kind passageway, the bottom of going out appearance interface is linked together with the chromatographic column.

2. The liquid sample introduction system for gas chromatograph according to claim 1, wherein the valve body comprises a first connector, a second connector and a valve seat, the first connector is provided with a first through hole penetrating through the top end and the bottom end of the first connector, the second connector is provided with a second through hole penetrating through the top end and the bottom end of the second connector, the valve seat is provided with a third through hole penetrating through the top end and the bottom end of the valve seat, the first through hole, the second through hole and the third through hole are coaxial and sequentially communicated from top to bottom to form the through cavity, the valve head is arranged at the top end of the first connector, the valve head bottom end and one of the top end of the first connector are provided with a first positioning boss, the other one of the first through hole, the second through hole and the third through hole are provided with a first positioning groove, the first positioning boss is mounted in the first positioning groove, and one of the first connector bottom end and the top end of the second connector is provided with a, The other one is provided with a second positioning groove, the second positioning boss is arranged in the second positioning groove, one of the bottom end of the second connector and the top end of the valve seat is provided with a third positioning boss, the other one is provided with a third positioning groove, the third positioning boss is arranged in the third positioning groove, the valve head, the first connector and the second connector are detachably connected, and the first connector, the second connector and the valve seat are detachably connected.

3. The gas chromatograph liquid sampling system of claim 2, further comprising a spring, a bearing, and a threaded sleeve, wherein the spring and the bearing are disposed in the through cavity, the spring and the bearing are sequentially sleeved on the valve rod from top to bottom, the third through hole comprises a large hole and a small hole which are coaxial and sequentially communicated from top to bottom, the large hole is communicated with the second through hole, the threaded sleeve is in threaded connection with an inner side wall of the small hole, a positioning flange is disposed on the valve rod, a top end of the spring abuts against a bottom end of the positioning flange, and a bottom end of the bearing is supported on a top end of the threaded sleeve.

4. The gas chromatograph liquid sample injection system of claim 3, wherein the spring is a belleville spring.

5. The gas chromatograph liquid sample injection system of claim 2, wherein the valve head, the first connector, and the second connector are connected by a first screw, and wherein the first connector, the second connector, and the valve seat are connected by a second screw.

6. The liquid sample injection system of gas chromatograph according to claim 1, further comprising a plurality of positioning pins, wherein a plurality of upper half pin holes are disposed at a bottom end of the valve flap, a plurality of lower half pin holes are disposed at a top end of the valve rod, one positioning pin corresponds to one upper half pin hole and one lower half pin hole, and one positioning pin is installed in one upper half pin hole at one end and installed in one lower half pin hole at the other end.

7. The gas chromatograph liquid sample injection system of claim 1, wherein the heating device is a heater rod.

8. The gas chromatograph liquid sample injection system of claim 1, wherein the motive device is a rotary cylinder.

Technical Field

The invention relates to the technical field of gas chromatograph sample introduction systems, in particular to a gas chromatograph liquid sample introduction system.

Background

Gas chromatographs on the existing market are based on gas analysis, use classical gas injection valves, and the gas injection valves can relatively easily ensure that a gas sample of 1ml is basically delivered to a separation detection system of the gas chromatograph every time, and are mainly applied to detection of atmospheric pollution, industrial waste gas emission and the like. For the analysis of liquid primary products, finished products and waste liquid in the chemical industry, the analysis of liquid samples is difficult due to the lack of a liquid gasification sample injection device.

Therefore, how to enable the gas chromatograph to analyze the liquid sample becomes a problem to be solved by those skilled in the art.

Disclosure of Invention

In order to solve the technical problems, the invention provides a liquid sample introduction system of a gas chromatograph, so that the gas chromatograph can analyze a liquid sample.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides a liquid sample introduction system of a gas chromatograph, which comprises: liquid ration sampling device, it includes power device, valve body, valve rod, valve clack, valve head and ration ring, the inside of valve body is provided with and link up the chamber that link up of valve body top and bottom, the valve clack rotationally set up in link up the intracavity, the one end of valve rod certainly the valve body bottom stretches into link up the intracavity and with the valve clack transmission is connected, the other end of valve rod with the power device transmission is connected, power device is used for the drive the valve rod rotates, the valve clack is kept away from the one end circumference of valve rod has set gradually first intercommunication groove, second intercommunication groove and third intercommunication groove, the valve head set up in the top of valve body, follow on the valve head the circumference of valve head has set gradually introduction passageway, carrier gas passageway, first ration ring passageway, emptying passageway, sampling passageway and second ration ring passageway, the ration ring the both ends respectively with first ration ring passageway and the second ration ring passageway links to each other The sampling channel is communicated with a liquid sample, the carrier gas channel is communicated with a carrier gas source, the emptying channel is communicated with the outside air, the sampling channel is communicated with the first quantitative ring channel through the first communicating groove in a first state, the sampling channel is communicated with the carrier gas channel through the second communicating groove, the second quantitative ring channel is communicated with the emptying channel through the third communicating groove, the first quantitative ring channel is communicated with the sampling channel through the first communicating groove in a second state, the carrier gas channel is communicated with the second quantitative ring channel through the second communicating groove, and the emptying channel is communicated with the sampling channel through the third communicating groove; liquid gasification equipment, it includes heat preservation shell, advances kind interface, gasification nest of tubes, play kind interface, reposition of redundant personnel interface and heating device, the inside heating chamber that is provided with of heat preservation shell, heating device set up in the heating chamber, gasification nest of tubes runs through heat preservation shell's top and bottom, just gasification nest of tubes runs through the heating chamber, gasification nest of tubes includes from interior to exterior nested first gasification pipe and the second gasification pipe that sets up, just first gasification pipe with be formed with the clearance layer between the second gasification pipe, the top of first gasification pipe with the bottom of advancing kind interface is linked together, the bottom of first gasification pipe is higher than the bottom of second gasification pipe, the bottom of second gasification pipe with the top of going out kind interface is linked together, the top shutoff of clearance layer, reposition of redundant personnel interface set up on the lateral wall of second gasification pipe and with the clearance layer is linked together, the top of appearance interface is linked together with kind passageway, the bottom of going out appearance interface is linked together with the chromatographic column.

Preferably, the valve body includes by last to first connector, second connector and the disk seat that sets gradually, first connector is provided with the first through-hole that link up its top and bottom, the second connector is provided with the second through-hole that runs through its top and bottom, the disk seat is provided with the third through-hole that runs through its top and bottom, first through-hole second through-hole and third through-hole are coaxial and from top to bottom communicate in proper order and form the through cavity, the valve head set up in the top of first connector, valve head bottom with one of first connector top is provided with first location boss, and another is provided with first positioning groove, first location boss install in first positioning groove, one of first connector bottom with one of second connector top is provided with second location boss, The other one is provided with a second positioning groove, the second positioning boss is arranged in the second positioning groove, one of the bottom end of the second connector and the top end of the valve seat is provided with a third positioning boss, the other one is provided with a third positioning groove, the third positioning boss is arranged in the third positioning groove, the valve head, the first connector and the second connector are detachably connected, and the first connector, the second connector and the valve seat are detachably connected.

Preferably, gas chromatograph liquid sampling system still includes spring, bearing and thread bush, the spring with the bearing all set up in link up the intracavity, just the spring with the bearing from top to bottom overlaps in proper order and locates on the valve rod, the third through-hole includes coaxial and from top to bottom big hole and the aperture that communicates in proper order, the big hole with the second through-hole communicates, the thread bush with inside wall threaded connection of aperture, be provided with the location flange on the valve rod, the top of spring with the bottom of location flange offsets, the bottom of bearing support in the top of thread bush.

Preferably, the spring is a belleville spring.

Preferably, the valve head, the first connecting body and the second connecting body are connected by a first screw, and the first connecting body, the second connecting body and the valve seat are connected by a second screw.

Preferably, the gas chromatograph liquid sampling system still includes a plurality of locating pins, the bottom of valve clack is provided with a plurality of first pinholes, the top of valve rod is provided with a plurality of second pinholes, one the locating pin corresponds one first pinhole and one second pinhole, one the one end of locating pin is installed in one first pinhole, the other end is installed in one second pinhole.

Preferably, the heating device is a heating rod.

Preferably, the power device is a rotary cylinder.

Compared with the prior art, the invention has the following technical effects:

the invention provides a liquid sample introduction system of a gas chromatograph, which comprises: the liquid quantitative sampling device comprises a power device, a valve body, a valve rod, a valve clack, a valve head and a quantitative ring, wherein a through cavity which penetrates through the top end and the bottom end of the valve body is arranged inside the valve body, the valve clack is rotatably arranged in the through cavity, one end of the valve rod extends into the through cavity from the bottom end of the valve body and is in transmission connection with the valve clack, the other end of the valve rod is in transmission connection with the power device, the power device is used for driving the valve rod to rotate, a first connecting groove, a second connecting groove and a third connecting groove are sequentially arranged at the circumferential direction of one end, away from the valve rod, of the valve clack, the valve head is arranged at the top end of the valve body, a sampling channel, a carrier gas channel, a first quantitative ring channel, an emptying channel, a sampling channel and a second quantitative ring channel are sequentially, the carrier gas channel is communicated with a carrier gas source, the emptying channel is communicated with the outside air, the sampling channel is communicated with the first quantitative ring channel through a first communicating groove in a first state, the sample feeding channel is communicated with the carrier gas channel through a second communicating groove, the second quantitative ring channel is communicated with the emptying channel through a third communicating groove, the first quantitative ring channel is communicated with the sample feeding channel through the first communicating groove in a second state, the carrier gas channel is communicated with the second quantitative ring channel through the second communicating groove, and the emptying channel is communicated with the sampling channel through the third communicating groove; the liquid gasification device comprises a heat-insulating shell, a sample inlet interface, a gasification pipe group, a sample outlet interface, a flow dividing interface and a heating device, wherein a heating cavity is arranged in the heat-insulating shell, the heating device is arranged in the heating cavity, the gasification pipe group penetrates through the top end and the bottom end of the heat-insulating shell, and the gasification tube group penetrates through the heating cavity and comprises a first gasification tube and a second gasification tube which are nested from inside to outside, and a gap layer is formed between the first gasification tube and the second gasification tube, the top end of the first gasification tube is communicated with the bottom end of the sample inlet interface, the bottom end of the first gasification tube is higher than the bottom end of the second gasification tube, the bottom end of the second gasification tube is communicated with the top end of the sample outlet interface, the top end of the gap layer is blocked, the shunt interface is arranged on the side wall of the second gasification tube and is communicated with the gap layer, the top end of the sample inlet interface is communicated with the sample inlet channel, and the bottom end of the sample outlet interface is communicated with the chromatographic column.

In the specific use process, the liquid quantitative sampling device quantitatively conveys liquid to the liquid gasification device, the liquid gasification device gasifies the quantitative liquid conveyed by the liquid quantitative sampling device, and conveys the gasified gas to the chromatographic column for analysis. This gas chromatograph liquid sampling system has overcome the defect that current gas chromatograph can not detect liquid sample, and through addding this gas chromatograph liquid sampling system, gas chromatograph can carry out the analysis to liquid sample.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a liquid sample injection system of a gas chromatograph provided in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a quantitative liquid sample injection device provided in an embodiment of the present invention;

FIG. 3 is a schematic view of a sampling state of the quantitative liquid sampling device according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of a sample introduction state of the quantitative liquid sample introduction device according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a liquid vaporizing apparatus provided in an embodiment of the present invention.

Description of reference numerals: 1. a valve stem; 2. a valve flap; 3. a valve head; 4. a first connecting groove; 5. a second communicating groove; 6. a third communicating groove; 7. a sample introduction channel; 8. a carrier gas channel; 9. a first dosing ring channel; 10. emptying the channel; 11. a sampling channel; 12. a second dosing ring channel; 13. a heat-insulating shell; 14. a sample introduction interface; 15. a sample outlet interface; 16. a shunt interface; 17. a heating cavity; 18. a first gasification pipe; 19. a second vaporizing tube; 20. a gap layer; 21. a first connecting body; 22. a second connector; 23. a valve seat; 24. a first positioning boss; 25. a second positioning boss; 26. a third positioning boss; 27. a spring; 28. a bearing; 29. a threaded sleeve; 30. a positioning flange; 31. positioning pins; 32. a dosing ring; 33. a liquid quantitative sample introduction device; 34. a liquid vaporizing device.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a liquid sample introduction system of a gas chromatograph, so that the gas chromatograph can analyze a liquid sample.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1 to fig. 5, the present embodiment provides a liquid sample injection system for a gas chromatograph, including: the liquid quantitative sampling device 33, the liquid quantitative sampling device 33 includes a power device, a valve body, a valve rod 1, a valve flap 2, a valve head 3 and a quantitative ring 32, a through cavity through the top end and the bottom end of the valve body is arranged inside the valve body, the valve flap 2 is rotatably arranged in the through cavity, one end of the valve rod 1 extends into the through cavity from the bottom end of the valve body and is in transmission connection with the valve flap 2, the other end of the valve rod 1 is in transmission connection with the power device, the power device is used for driving the valve rod 1 to rotate, a first communicating groove 4, a second communicating groove 5 and a third communicating groove 6 are sequentially arranged at one end of the valve flap 2 far away from the valve rod 1 in the circumferential direction, the valve head 3 is arranged at the top end of the valve body, a sampling channel 7, a carrier gas channel 8, a first quantitative ring channel 9, a vent channel 10, a sampling channel 11 and a second quantitative ring channel 12 are sequentially arranged on the, the sampling channel 7 is communicated with a liquid sample, the carrier gas channel 8 is communicated with a carrier gas source, the carrier gas source is used for conveying carrier gas into the carrier gas channel 8, the emptying channel 10 is communicated with the outside air, in a first state (sampling state), the sampling channel 11 is communicated with the first quantitative ring channel 9 through the first communicating groove 4, the sampling channel 7 is communicated with the carrier gas channel 8 through the second communicating groove 5, the second quantitative ring channel 12 is communicated with the emptying channel 10 through the third communicating groove 6, in a second state (sampling state), the first quantitative ring channel 9 is communicated with the sampling channel 7 through the first communicating groove 4, the carrier gas channel 8 is communicated with the second quantitative ring channel 12 through the second communicating groove 5, and the emptying channel 10 is communicated with the sampling channel 11 through the third communicating groove 6; the liquid gasification device 34 comprises a heat preservation shell 13, a sample inlet interface 14, a gasification tube group, a sample outlet interface 15, a shunt interface 16 and a heating device, wherein a heating cavity 17 is arranged in the heat preservation shell 13, the heating device is arranged in the heating cavity 17, the gasification tube group penetrates through the top end and the bottom end of the heat preservation shell 13 and penetrates through the heating cavity 17, the gasification tube group comprises a first gasification tube 18 and a second gasification tube 19 which are nested from inside to outside, a gap layer 20 is formed between the first gasification tube 18 and the second gasification tube 19, the top end of the first gasification tube 18 is communicated with the bottom end of the sample inlet interface 14, the bottom end of the first gasification tube 18 is higher than the bottom end of the second gasification tube 19, the bottom end of the second gasification tube 19 is communicated with the top end of the sample outlet interface 15, the top end of the gap layer 20 is blocked, the shunt interface 16 is arranged on the side wall of the second gasification tube 19 and is, the top end of the sample inlet interface 14 is communicated with the sample inlet channel 7, and the bottom end of the sample outlet interface 15 is communicated with the chromatographic column. It is prior art how to block the top end of the gap layer 20, for example, a blocking plate is provided, and the top end of the gap layer 20 is flush with the top end of the second gasification pipe 19, and the bottom end of the gap layer 20 is flush with the bottom end of the first gasification pipe 18. This gas chromatograph liquid sampling system has overcome the defect that current gas chromatograph can not detect liquid sample, and through addding this gas chromatograph liquid sampling system, gas chromatograph can carry out the analysis to liquid sample.

This gas chromatograph liquid sampling system during operation, under the sampling state, sampling channel 11 is linked together through first communicating groove 4 and first quantitative ring channel 9, and sampling channel 7 is linked together through second communicating groove 5 and carrier gas passageway 8, and second quantitative ring channel 12 is linked together through third communicating groove 6 and unloading passageway 10, and the passageway that forms this moment is: liquid sample → the sampling channel 11 → the first connecting channel 4 → the first quantitative ring channel 9 → the second quantitative ring channel 12 → the third connecting channel 6 → the vent channel 10. When the quantitative ring 32 is filled with the liquid sample to be measured, the sampling stage is finished; after the sampling phase, power device drive valve rod 1 rotates, valve rod 1 drives valve clack 2 synchronous rotation, rotate to first quantitative ring channel 9 when valve clack 2 and be linked together through first communicating groove 4 and sampling channel 7, carrier gas passageway 8 is linked together through second communicating groove 5 and second quantitative ring channel 12, when unloading passageway 10 is linked together through third communicating groove 6 and sampling channel 11, gas chromatograph liquid sampling system switches to the appearance state of advancing, the passageway that forms this moment is: the carrier gas source → the carrier gas channel 8 → the second communicating groove 5 → the second quantitative ring channel 12 → the first quantitative ring channel 9 → the first communicating groove 4 → the sample introduction channel 7. The liquid sample to be measured filled in the quantitative ring 32 enters the sample inlet 14 of the liquid vaporizing device 34 under the driving of the carrier gas, and enters the first vaporizing tube 18 from the sample inlet 14, at this time, under the action of the heating device, the heating cavity 17 is in a high temperature state, the first vaporizing tube 18 penetrates through the heating cavity 17, the part of the first vaporizing tube 18 located in the heating cavity 17 is also in the high temperature state, the liquid sample is vaporized instantaneously in the process of passing through the part, the volume of the sample is expanded after being vaporized, a part of the expanded gas enters the chromatographic column from the sample outlet 15, and the other part of the expanded gas enters the gap layer 20 from the bottom end of the first vaporizing tube 18, rises along the gap layer 20, rises from the shunt interface 16, and is discharged from the shunt interface 16.

In this embodiment, as shown in fig. 2, the valve body comprises a first connecting body 21, a second connecting body 22 and a valve seat 23, which are sequentially arranged from top to bottom, the first connecting body 21 is provided with a first through hole penetrating through the top end and the bottom end of the first connecting body, the second connecting body 22 is provided with a second through hole penetrating through the top end and the bottom end of the second connecting body, the valve seat 23 is provided with a third through hole penetrating through the top end and the bottom end of the valve seat, the first through hole, the second through hole and the third through hole are coaxial and sequentially communicated from top to bottom to form a through cavity, the valve head 3 is arranged at the top end of the first connecting body 21, one of the bottom end of the valve head 3 and the top end of the first connecting body 21 is provided with a first positioning boss 24, the other is provided with a first positioning groove, the first positioning boss 24 is installed in the first positioning groove, one of the bottom end of the first, the second location boss 25 sets up in the second positioning groove, and one of the bottom of second connector 22 and the top of disk seat 23 is provided with third location boss 26, and the other is provided with third positioning groove, and third location boss 26 sets up in third positioning groove, and valve head 3, first connector 21 and second connector 22 three can dismantle the connection, and first connector 21, second connector 22 and disk seat 23 three can dismantle the connection. So set up, device easy dismounting. In addition, in this embodiment, specifically, the bottom end of the valve head 3 is provided with a first positioning boss 24, the top end of the first connecting body 21 is provided with a first positioning groove, the bottom end of the first connecting body 21 is provided with a second positioning boss 25, the top end of the second connecting body 22 is provided with a second positioning groove, the bottom end of the second connecting body 22 is provided with a third positioning groove, and the top end of the valve body is provided with a third positioning boss 26.

In this embodiment, as shown in fig. 2, the liquid sample injection system of the gas chromatograph further includes a spring 27, a bearing 28 and a threaded sleeve 29, the spring 27 and the bearing 28 are both disposed in the through cavity, and the spring 27 and the bearing 28 are sequentially sleeved on the valve rod 1 from top to bottom, the third through hole includes a large hole and a small hole which are coaxial and sequentially communicated from top to bottom, the large hole is communicated with the second through hole, the threaded sleeve 29 is in threaded connection with an inner side wall of the small hole, a positioning flange 30 is disposed on the valve rod 1, a top end of the spring 27 abuts against a bottom end of the positioning flange 30, and a bottom end of the bearing 28 is supported at a top. The valve rod 1 has good rotation stability by arranging the bearing 28.

In the present embodiment, the spring 27 is a belleville spring 27.

In this embodiment, in order to make the device more convenient to assemble and disassemble, the valve head 3, the first connector 21 and the second connector 22 are connected by a first screw, and the first connector 21, the second connector 22 and the valve seat 23 are connected by a second screw.

In this embodiment, as shown in fig. 1, the liquid sample injection system of the gas chromatograph further includes a plurality of positioning pins 31, the bottom end of the valve flap 2 is provided with a plurality of upper half pin holes, the top end of the valve rod 1 is provided with a plurality of lower half pin holes, one positioning pin 31 corresponds to one upper half pin hole and one lower half pin hole, one end of one positioning pin 31 is installed in one upper half pin hole, and the other end is installed in one lower half pin hole. So set up, the device dismouting is more convenient.

In this embodiment, the heating device is a heating rod.

In this embodiment, the power device is a rotary cylinder.

It should be noted that the heating device is not limited to a heating rod, and any device capable of heating may be used; the power device is not limited to a rotary cylinder, and any device capable of driving the valve rod 1 to rotate can be used; the sample inlet interface 14, the sample outlet interface 15 and the shunt interface 16 are all hollow cylindrical structures with two open ends; the quantitative ring 32 belongs to the prior art, the detailed structure is not repeated, the sample injection amount of the sample injection ring is determined according to the gas amount that the chromatographic column can detect, in this embodiment, the quantitative ring 32 specifically selects the 1uL quantitative ring, but not only is limited to selecting the 1uL quantitative ring, the top end of the sample injection interface 14 is communicated with the sample injection channel 7 through the 1/16 stainless steel tube, the liquid quantitative sample injection device 33 switches 1uL of liquid sample each time to cut into the first gasification tube 18, 1uL of liquid sample is instantly gasified after entering the first gasification tube 18, and enters the chromatographic column along the first gasification tube 18 to realize separation.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.