阅读说明：本技术 一种气相色谱进样装置及气相色谱仪 (Gas chromatography sampling device and gas chromatograph ) 是由 王红都 蔡红军 梅海 周建伟 于 2021-10-18 设计创作，主要内容包括：本发明涉及气体检测技术领域,尤其涉及一种气相色谱进样装置及气相色谱仪,该气相色谱进样装置包括进样筒、分流板、衬管、连接座、隔垫和密封盖,进样筒内部具有一端开口的腔室,进样筒底部具有色谱柱进气管,外壁上分流管、载气管和吹扫管；分流板设置在腔室的底部,衬管套设在腔室内,连接座螺接在进样筒的顶部开口处,隔垫与台阶孔相适应的套设在台阶孔内,密封盖螺接在进样筒开口端；其中,连接座底部具有连接爪,衬管底部具有连接腿,连接爪与衬管的外壁连接,连接腿与分流板的表面连接。在本发明中,在需要进行清洗或更换时,仅需拉动连接座,即可将衬管、分流板以及隔垫一起从进样筒中取出,提高了更换和清洁的便捷性。(The invention relates to the technical field of gas detection, in particular to a gas chromatography sample introduction device and a gas chromatograph, wherein the gas chromatography sample introduction device comprises a sample introduction cylinder, a flow distribution plate, a liner tube, a connecting seat, a spacer and a sealing cover, a cavity with an opening at one end is arranged in the sample introduction cylinder, a chromatographic column air inlet tube is arranged at the bottom of the sample introduction cylinder, and a flow distribution tube, a gas carrying tube and a purging tube are arranged on the outer wall of the sample introduction cylinder; the flow distribution plate is arranged at the bottom of the cavity, the lining pipe is sleeved in the cavity, the connecting seat is screwed at the opening at the top of the sample feeding cylinder, the spacer is sleeved in the step hole corresponding to the step hole, and the sealing cover is screwed at the opening end of the sample feeding cylinder; wherein, the connecting seat bottom has the connecting claw, and the bushing pipe bottom has the connection leg, and the outer wall connection of connecting claw and bushing pipe connects the leg and is connected with the surface of flow distribution plate. When the sampling tube needs to be cleaned or replaced, the liner tube, the flow distribution plate and the spacer can be taken out of the sampling tube together only by pulling the connecting seat, so that convenience in replacement and cleaning is improved.)

1. A gas chromatography sampling device, characterized by comprising:

the sampling device comprises a sampling cylinder, a cavity with an opening at one end is arranged in the sampling cylinder, a chromatographic column air inlet pipe communicated with the cavity is arranged at the bottom of the sampling cylinder, a flow dividing pipe communicated with the cavity is arranged on the outer wall of the sampling cylinder, which is close to the chromatographic column air inlet pipe, a gas carrying pipe communicated with the cavity is arranged on the outer wall of the sampling cylinder, which is far away from the chromatographic column air inlet pipe, and a purging pipe communicated with the cavity is arranged at the position, opposite to the gas carrying pipe, of the outer wall of the sampling cylinder;

the flow distribution plate is arranged at the bottom of the cavity and is provided with a straight hole in a penetrating manner along the thickness direction of the flow distribution plate, and the straight hole is communicated with the chromatographic air inlet pipe;

the liner tube is sleeved in the cavity, and an O-shaped sealing ring which is in contact with the inner wall of the sample injection cylinder is arranged on the outer wall of the liner tube at the position between the flow dividing tube and the gas carrier tube;

the connecting seat is in threaded connection with an opening at the top of the sample inlet cylinder, and a step hole communicated with the cavity is arranged on the connecting seat in a penetrating manner;

the spacer is sleeved in the step hole corresponding to the step hole;

the sealing cover is in threaded connection with the opening end of the sample injection cylinder and is in contact with the isolating pad, and a sample injection hole communicated with the isolating pad is formed in the sealing cover;

the connecting base bottom has the connecting claw, the bushing pipe bottom has the connecting leg, the connecting claw with the outer wall connection of bushing pipe, the connecting leg with the surface connection of flow distribution plate, the length of connecting claw and connecting leg satisfies the length requirement that the carrier gas got into and shunted.

2. The gas chromatography sampling device of claim 1, wherein the splitter plate has a connection platform towards one side of the liner tube, the connection platform sequentially comprises a connection base, a connection column and a guide limit platform, the connection leg bottom has a connection sleeve, and the connection sleeve passes through the guide limit platform and is fixed on the connection column.

3. The gas chromatography sample introduction device according to claim 2, wherein two sections of arc-shaped protruding strips are symmetrically arranged on the side wall of the flow distribution plate along the diameter direction, and the two arc-shaped protruding strips are respectively located in the direction of the side wall where the gas carrier pipe and the flow distribution pipe are located.

4. The gas chromatography sample introduction device according to claim 3, wherein the two arc-shaped protruding strips are arranged with a length center line of the linear hole as a symmetry axis, and when the flow distribution plate is not under pressure, the two arc-shaped protruding strips are in contact with the inner side wall of the sample introduction cylinder, and when the flow distribution plate is under pressure, the two arc-shaped protruding strips apply a reverse force towards the linear hole direction so as to reduce the linear hole area.

5. The gas chromatography sample introduction device according to claim 4, wherein the connection table is symmetrically distributed along two sides of the straight hole.

6. The gas chromatography sample introduction device according to claim 5, wherein a sealing ring plate is further arranged at the bottom of the flow distribution plate, the sealing ring plate is arranged to surround the straight hole, and the cross section of the sealing ring plate is arranged in an arc shape protruding outwards.

7. The gas chromatography sample introduction device according to claim 1, wherein the bottom of the connection claw is convexly arranged towards the inside, a clamping groove is formed in the outer side wall of the liner tube, and the bottom of the connection claw is clamped in the clamping groove.

8. The gas chromatography sample introduction device according to claim 7, wherein the clamping groove is arranged in a ring shape, and the distance between the outer wall of the connecting claw and the inner wall of the sample introduction cylinder is smaller than the depth of the protrusion at the bottom of the connecting claw extending into the clamping groove.

9. The gas chromatography sample introduction device according to claim 8, wherein a sealing structure is arranged between the connecting seat and the inner wall of the sample introduction cylinder and between the top of the sample introduction cylinder and the sealing cover.

10. A gas chromatograph comprising a gas chromatography sample introduction device according to any of claims 1 to 9, a chromatographic column connected at one end to the gas chromatography sample introduction device, and a gas detector connected to the other end of the chromatographic column.

Technical Field

The invention relates to the technical field of gas detection, in particular to a gas chromatography sample introduction device and a gas chromatograph.

Background

The gas chromatograph is an instrument for qualitatively and quantitatively analyzing multi-component complex mixture by using chromatographic separation technology and detection technology, and its working principle is that gas is used as carrier gas, when the sample is injected into sample injector by microinjector, the sample is carried by carrier gas and fed into chromatographic column, and under the action of flushing of carrier gas, the components are repeatedly distributed between two phases to make them be separated in the chromatographic column, then the components can be detected according to their physicochemical characteristics by means of detector connected with chromatographic column.

In the related art, a sample inlet of a gas chromatograph is the most prone to cause problems, firstly, the sealing performance of the sample inlet is good, otherwise, once a leakage problem occurs, when a carrier gas is a flammable and explosive gas such as hydrogen, a safety problem easily occurs, and air can enter a sample injection device to influence the accuracy of final detection, for example, oxygen can damage a stationary phase coating in a chromatographic column to influence the service life of the chromatographic column; secondly, the problem that the sample remained or blockked up still appears in the introduction port easily, like this, will influence the precision nature that detects greatly, and the method that often uses among the prior art is for often changing the sealed pad in the introduction port to guarantee the inside cleanness and the leakproofness of introduction port, nevertheless when changing sealed pad, need change spacer, bushing pipe, O type sealing washer and reposition of redundant personnel flat board in proper order, and the operation is comparatively loaded down with trivial details, influences detection efficiency.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the utility model provides a gas chromatography sampling device and gas chromatograph improves the convenience when introduction port sealing member changes.

In order to achieve the purpose, the invention adopts the technical scheme that:

in a first aspect, the present disclosure provides a gas chromatography sample injection device, including:

the sampling device comprises a sampling cylinder, a cavity with an opening at one end is arranged in the sampling cylinder, a chromatographic column air inlet pipe communicated with the cavity is arranged at the bottom of the sampling cylinder, a flow dividing pipe communicated with the cavity is arranged on the outer wall of the sampling cylinder, which is close to the chromatographic column air inlet pipe, a gas carrying pipe communicated with the cavity is arranged on the outer wall of the sampling cylinder, which is far away from the chromatographic column air inlet pipe, and a purging pipe communicated with the cavity is arranged at the position, opposite to the gas carrying pipe, of the outer wall of the sampling cylinder;

the flow distribution plate is arranged at the bottom of the cavity and is provided with a straight hole in a penetrating manner along the thickness direction of the flow distribution plate, and the straight hole is communicated with the chromatographic air inlet pipe;

the liner tube is sleeved in the cavity, and an O-shaped sealing ring which is in contact with the inner wall of the sample injection cylinder is arranged on the outer wall of the liner tube at the position between the flow dividing tube and the gas carrier tube;

the connecting seat is in threaded connection with an opening at the top of the sample inlet cylinder, and a step hole communicated with the cavity is arranged on the connecting seat in a penetrating manner;

the spacer is sleeved in the step hole corresponding to the step hole;

the sealing cover is in threaded connection with the opening end of the sample injection cylinder and is in contact with the isolating pad, and a sample injection hole communicated with the isolating pad is formed in the sealing cover;

the connecting base bottom has the connecting claw, the bushing pipe bottom has the connecting leg, the connecting claw with the outer wall connection of bushing pipe, the connecting leg with the surface connection of flow distribution plate, the length of connecting claw and connecting leg satisfies the length requirement that the carrier gas got into and shunted.

Further, the flow distribution plate orientation has the connection platform on the one side of bushing pipe, connect the platform including connecting base, spliced pole and the spacing platform of direction in proper order, connecting leg bottom has the adapter sleeve, the adapter sleeve passes the spacing platform after-fixing of direction is in on the spliced pole.

Furthermore, two sections of arc-shaped protruding strips are symmetrically arranged on the side wall of the flow distribution plate along the diameter direction, and the two arc-shaped protruding strips are respectively positioned in the direction of the side wall where the gas carrying pipe and the flow distribution pipe are positioned.

Further, two the protruding strip of arc with the length center line in a word hole sets up as the symmetry axis, and is in when the flow distribution plate does not receive pressure, two the protruding strip of arc with advance the inside wall contact of a kind section of thick bamboo, when the flow distribution plate receives pressure, two the protruding strip orientation of arc exerts the counter force in a word hole direction, in order to reduce a word hole area.

Furthermore, the connecting tables are symmetrically distributed along two sides of the straight hole.

Furthermore, the bottom of the flow distribution plate is also provided with a sealing ring plate, the sealing ring plate is wrapped around the straight hole, and the cross section of the sealing ring plate is arranged in an arc shape protruding outwards.

Furthermore, the bottom of the connecting claw is convexly arranged towards the inner side, a clamping groove is formed in the outer side wall of the liner tube, and the bottom of the connecting claw is clamped in the clamping groove.

Further, the draw-in groove sets up to the annular, the outer wall of connecting claw with the distance of advance a kind section of thick bamboo inner wall is less than the protruding degree of depth that stretches into in connecting claw bottom the draw-in groove.

Further, the connecting seat with all have seal structure between advancing a kind section of thick bamboo inner wall and advance a kind section of thick bamboo top with between the sealed lid.

In a second aspect, the present disclosure further provides a gas chromatograph including the gas chromatography sampling apparatus of the first aspect, a chromatographic column with one end connected to the gas chromatography sampling apparatus, and a gas detector connected to the other end of the chromatographic column.

The invention has the beneficial effects that: according to the invention, the bottom of the liner tube is connected with the splitter plate in an extending manner, the spacer is connected with the liner tube through the connecting claws at the bottom, and the spacer is embedded on the connecting seat, so that the liner tube, the splitter plate and the spacer can be taken out from the sample injection cylinder together by pulling the connecting seat when the splitter plate, the liner tube and the spacer are required to be cleaned or replaced.

Drawings

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

FIG. 1 is a cross-sectional view of a gas chromatography sample injection apparatus in an embodiment of the invention;

FIG. 2 is a schematic structural diagram of a sample introduction cartridge according to an embodiment of the present invention;

FIG. 3 is a schematic view of a connection structure of the connection seat, the lining tube and the splitter plate according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the exploded structure of FIG. 3 in an embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 in accordance with an embodiment of the present invention;

FIG. 6 is a schematic view of the structure of a diverter plate according to an embodiment of the present invention;

FIG. 7 is a sectional view taken along line B-B of FIG. 6 in accordance with an embodiment of the present invention;

FIG. 8 is an enlarged view of a portion of FIG. 4 at C in accordance with an embodiment of the present invention;

FIG. 9 is a schematic diagram of a gas chromatograph according to an embodiment of the present invention;

FIG. 10 is a diagram illustrating a spectrum detected in an example of the present invention.

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.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The sample introduction device for gas chromatography shown in fig. 1 to 8 comprises a sample introduction cylinder 10, a flow distribution plate 20, a liner tube 30, a connecting seat 40, a spacer 50 and a sealing cover 60, wherein,

a cavity with an opening at one end is arranged in the sample feeding cylinder 10, a chromatographic column air inlet pipe 11 communicated with the cavity is arranged at the bottom of the sample feeding cylinder 10, a shunt pipe 12 communicated with the cavity is arranged on the outer wall of the sample feeding cylinder 10 close to the chromatographic column air inlet pipe 11, a gas carrying pipe 13 communicated with the cavity is arranged on the outer wall of the sample feeding cylinder 10 far away from the chromatographic column air inlet pipe 11, and a purging pipe 14 communicated with the cavity is arranged at the position, opposite to the gas carrying pipe 13, of the outer wall of the sample feeding cylinder 10; it should be noted here that the carrier gas pipe 13 is connected to a gas source, and the gas inlet pressure of the carrier gas is controlled by a pressure controller, so as to ensure that the sample passes through the liner pipe 30 and the splitter plate 20 under the blowing of the carrier gas and then enters the chromatographic column connected to the bottom for separation; the shunt tube 12 is used for reducing samples entering the chromatographic column so as to prevent the samples from being accumulated too much and being incapable of detecting to obtain an accurate result, and the purging tube 14 is used for purging residual samples below the spacer 50 completely through communication with the carrier gas tube 13 so as to prevent the residual samples from influencing detection; it should be noted that valves are disposed on the purge pipe 14 and the shunt pipe 12, and the valves are opened and closed when necessary;

the flow distribution plate 20 is arranged at the bottom of the chamber, a straight hole 21 is arranged on the flow distribution plate 20 along the thickness direction of the flow distribution plate, and the straight hole 21 is communicated with the chromatographic air inlet pipe; the liner tube 30 is sleeved in the cavity, and an O-shaped sealing ring 31 which is contacted with the inner wall of the sample injection cylinder 10 is arranged on the outer wall of the liner tube 30 at the position between the shunt tube 12 and the gas carrier tube 13; in the embodiment of the present invention, a certain distance is left between the diversion plate 20 and the liner tube 30, and by the arrangement of the O-ring 31, a part of the gas blown from the liner tube 30 flows into the chromatographic column from the slotted hole 21, and another part flows into the space between the outside of the liner tube 30 and the chamber, and then flows out from the diversion tube 12;

the connecting base 40 is in threaded connection with the opening at the top of the sample inlet cylinder 10, and a step hole 41 communicated with the chamber is arranged on the connecting base 40 in a penetrating manner; the spacer 50 is sleeved in the step hole 41 in a manner of being matched with the step hole 41; the sealing cover 60 is screwed on the opening end of the sampling cylinder 10 and is contacted with the spacer 50, and the sealing cover 60 is provided with a sampling hole 61 communicated with the spacer 50; thus, when a sample is placed in liner 30, as shown in FIG. 9, the sample is pushed into liner 30 after penetrating spacer 50 with the needle of the syringe, vaporized by heating in liner 30 and then enters the column or shunt tube 12 along with the carrier gas;

as shown in fig. 3 and 4, connecting claws 42 are arranged at the bottom of connecting seat 40, connecting legs 32 are arranged at the bottom of lining tube 30, connecting claws 42 are connected with the outer wall of lining tube 30, connecting legs 32 are connected with the surface of flow distribution plate 20, and the length of connecting claws 42 and connecting legs 32 meets the length requirement of carrier gas entering and flow distribution. The requirement for the length of the carrier gas entering and shunting is met, namely that the connecting claws 42 and the connecting legs 32 are of a certain length, so that the entering carrier gas can be directly blown into the purging pipe 14, and the gas flowing out of the bottom of the liner pipe 30 can also flow out of the side face of the shunting plate 20, and therefore the smooth running of the test is ensured.

In the above embodiment, by extending the bottom of the lining tube 30 to connect with the splitter plate 20, and connecting the bottom to the lining tube 30 through the connecting claws 42, and by embedding the spacer 50 on the connecting seat 40, when the splitter plate 20, the lining tube 30 and the spacer 50 need to be cleaned or replaced, the lining tube 30, the splitter plate 20 and the spacer 50 can be taken out from the sample injection cylinder 10 together by pulling the connecting seat 40, which improves the convenience of replacing and cleaning the splitter plate 20, the lining tube 30 and the spacer 50 compared with the prior art.

On the basis of the above embodiments, as shown in fig. 5 to 7, in detail, regarding the connection structure of the liner 30 and the diverter plate 20, a connection table 22 is provided on a surface of the diverter plate 20 facing the liner 30, the connection table 22 sequentially includes a connection base 22a, a connection column 22b and a guide limiting table 22c, a connection sleeve 32a is provided at the bottom of the connection leg 32, and the connection sleeve 32a passes through the guide limiting table 22c and then is fixed on the connection column 22 b. The splitter plate 20 is made of elastic material due to the sealing function, so that the channel guide limiting table 22c can extend into the connecting sleeve 32a to realize fixation, and the splitter plate 20 can be conveniently detached and installed in the fixing mode, and the splitter plate 20 can be conveniently and accurately positioned when the splitter plate 20 is placed into the sample injection cylinder 10;

in the embodiment of the present invention, the splitter plate 20 can also achieve a cleaning function on the sample feeding barrel 10 when being removed, as shown in fig. 6 and fig. 1, two sections of arc-shaped protruding strips 23 are symmetrically arranged on the sidewall of the splitter plate 20 along the diameter direction, and the two arc-shaped protruding strips 23 are respectively located in the sidewall direction where the carrier gas pipe 13 and the splitter tube 12 are located. Thus, when the connecting seat 40 is taken down, the connecting seat 40 is connected with the liner tube 30, the liner tube 30 is connected with the shunt plate 20, so that the arc-shaped bulge on the shunt plate 20 is contacted with the inner side wall of the sample injection cylinder 10, the gas carrier tube 13, the purging tube 14 and the inner wall tube opening of the shunt tube 12 are cleaned, and blocked or residual substances are scraped completely; the cleaning efficiency is improved through the cleaning function when the splitter plate 20 is taken out, so that the working efficiency and the detection accuracy are improved;

in the specific splitting, the flow rate of the split tube 12 and the flow rate of the carrier gas are generally controlled, but the above-mentioned method of controlling the split ratio by the air flow is not accurate enough, so in the embodiment of the present invention, the adjustment of the air flow entering the chromatographic column is also realized by changing the inlet area of the linear hole 21, please refer to fig. 5 to 7, the two arc-shaped protruding strips 23 are arranged with the length center line of the linear hole 21 as the symmetry axis, and when the splitter plate 20 is not under pressure, the two arc-shaped protruding strips 23 contact the inner side wall of the sample injection cylinder 10, and when the splitter plate 20 is under pressure, the two arc-shaped protruding strips 23 apply a reverse force toward the linear hole 21 to reduce the area of the linear hole 21. Because when the thickness direction of the flow distribution plate 20 is stressed, the flow distribution plate 20 can be deformed transversely, and because the two house-type convex parts are arranged on the two sides of the straight hole 21, the two house-type convex parts can apply thrust to the side wall of the straight hole 21 when stressed, so that the orifice area of the straight hole 21 is reduced, and further the air inflow of the straight hole 21 is adjusted, and during specific adjustment, because the connecting seat 40 is screwed on the sample inlet cylinder 10, the pressure can be applied to the flow distribution plate 20 by virtue of the connecting claw 42 and the connecting leg 32 only by rotating the connecting seat 40 to descend.

In order to further enhance the force application effect on the flow divider 20, as shown in fig. 6, a plurality of connection stages 22 are symmetrically disposed along both sides of the linear hole 21. Similarly, a plurality of connecting legs 32 are correspondingly arranged, so that the force is uniformly applied to two sides of the straight hole 21, and the controllability of the deformation of the straight hole 21 can be improved.

In order to ensure the sealing performance of the flow distribution plate 20 when the flow distribution ratio is adjusted by the flow distribution plate 20, i.e. to prevent gas from flowing in from the side wall of the flow distribution plate 20, in the embodiment of the present invention, as shown in fig. 6 and 7, the bottom of the flow distribution plate 20 is further provided with a sealing ring plate 24, the sealing ring plate 24 is disposed to surround the linear hole 21, and the cross section of the sealing ring plate 24 is disposed in an arc shape protruding outwards. By this arrangement, the sealing ring plate 24 can be deformed in the height direction, that is, when the pressure is low, the sealing ring plate 24 is bent to the minimum extent and takes the shape as shown in fig. 7, and when the pressure is high, the sealing ring plate 24 is bent outward and takes the shape of a "C" in cross section, but the sealing performance with the bottom of the chamber can still be ensured. Through the arrangement, the splitter plate 20 not only can ensure the original sealing performance, but also can realize the functions of cleaning and adjusting the splitting ratio.

Regarding the connection structure of the connection seat 40 and the liner tube 30, as shown in fig. 3, 4 and 8, the bottom of the connection claw 42 is protruded toward the inner side, the outer side wall of the liner tube 30 has a catching groove 33, and the bottom of the connection claw 42 is caught in the catching groove 33. In the preferred embodiment of the present invention, the locking groove 33 is configured as a ring, and the distance between the outer wall of the connection claw 42 and the inner wall of the sample injection cylinder 10 is less than the depth of the protrusion at the bottom of the connection claw 42 extending into the locking groove 33. Thus, the connecting claws 42 can be always abutted against the clamping grooves 33, and even if the connecting seat 40 rotates, the claws can rotate in the annular clamping grooves 33, and the liner tube 30 cannot be influenced; after removal of the liner 30, separation from the liner 30 can be achieved by toggling the dogs.

As shown in fig. 1, in order to ensure the sealing performance between the connection seat 40 and the sample cylinder 10, sealing structures are provided between the connection seat 40 and the inner wall of the sample cylinder 10 and between the top of the sample cylinder 10 and the sealing cover 60. The sealing structure here refers to a sealing groove and a sealing ring, and of course, the sealing ring may be disposed on the sidewall of the connection seat 40, and may also be disposed at the top or bottom position. In the preferred embodiment of the present invention, the sealing ring is provided on the sidewall of the coupling socket 40, and as shown in fig. 3, a part of a flat surface is cut on the top sidewall of the coupling socket 40 to facilitate the removal or height adjustment of the coupling socket 40. The sealing cover 60 is in threaded connection with the outer wall of the sample injection cylinder 10 through threads, and anti-slip threads are further arranged on the side wall of the sealing cover 60 so as to be convenient to detach and install.

In another aspect, the embodiment of the present invention further provides a gas chromatograph as shown in fig. 9, which includes the above-mentioned gas chromatography sample injection device 100, a chromatographic column 200 with one end connected to the gas chromatography sample injection device 100, and a gas detector 300 connected to the other end of the chromatographic column 200. When the test is specifically carried out, firstly, after the pressure value and the temperature of the carrier gas are adjusted, the sample is injected through the injector to start purging, so that the sample enters the chromatographic column 200 and is detected, the power supply, the carrier gas valve and the like are closed after the temperature is reduced to be below 100 ℃ after the spectrogram is detected; in the embodiment of the invention, argon is used as carrier gas, the types and the contents of the gases in the sample are respectively measured, the gases containing helium, hydrogen, nitrogen, carbon monoxide and carbon dioxide are obtained through measurement, and the concentration of each component can be obtained from a map shown in figure 10;

it should be noted that the gas chromatograph further includes a heating furnace, a carrier gas supply unit, a controller for controlling the heating furnace and the carrier gas supply unit, and the like, which are all in the prior art and are not described herein again, but it should be noted that the gas chromatograph employing the gas chromatography sampling apparatus 100 that is convenient to disassemble and clean in the embodiment of the present invention falls within the protection scope of the present invention.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.