Multi-mode sampling device for chromatographic analysis instrument

Abstract

The invention discloses a multi-mode sample introduction device for a chromatographic analysis instrument, and relates to the technical field of chromatographic instrument equipment.The sample introduction device comprises four sample introduction rods, a stainless steel pipe, a heating assembly and a heating and refrigerating assembly, the sample introduction rods are located in the stainless steel pipe, and the heating assembly is located in the stainless steel pipe; the stainless steel tubes are respectively a gas concentration sample injection rod, a water quality concentration sample injection rod, a built-in liner tube sample injection rod and a solid concentration sample injection rod, and a self-locking assembly is arranged at the top end in the stainless steel tube and is used for fixing the sample injection rods.

Description

Technical Field

[0001] The invention relates to the technical field of chromatograph equipment, in particular to a multi-mode sample injection device for a chromatographic analysis instrument. Background Art

[0002] At present, there are relatively few samples that can be used for direct sampling in gas chromatography analysis. Most samples need to undergo certain pretreatments before sampling. Water, soil, low-concentration samples, etc. generally need to undergo headspace, purging, extraction, enrichment and concentration pretreatments before they can be analyzed on the machine. The pretreatment operations are cumbersome and time-consuming, and the pretreatment equipment is large in size and energy consumption, which is not suitable for on-site analysis and cannot meet the application needs of rapid detection of pollutants in complex on-site media. Summary of the invention

[0003] The object of the present invention is to provide a multi-mode sample injection device for a chromatographic analysis instrument to solve the problems raised in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multi-mode injection device for a chromatographic analysis instrument, the injection device comprising an injection rod, a stainless steel tube, a heating assembly and a heating and cooling assembly, the injection rod being located inside the stainless steel tube, and there are four types of injection rods, namely, a gas concentration injection rod, a water concentration injection rod, a built-in liner injection rod and a solid concentration injection rod, and a self-locking assembly is provided at the top end of the stainless steel tube, and the self-locking assembly is used to fix the injection rod.

[0005] The stainless steel tube is used to store the replaceable injection rod. The injection rod has multiple modes. The heating component is used to perform thermal processing on the sample in the stainless steel tube. The heating and cooling component is used to cooperate with the heating component to process the sample. Then, there are four types of injection rods, a gas concentration injection rod for gas sampling, enrichment and concentration, a water concentration injection rod for water sample concentration, a built-in liner injection rod for direct sampling of liquid and gas samples, and a solid concentration injection rod for concentrated sampling of granular samples such as soil and sediments. Each injection rod has a different structure, and the self-locking component is used to fix one end of the injection rod, so as to facilitate sampling between the detection end of the chromatographic analyzer and the injection rod.

[0006] Furthermore, the injection rod and the stainless steel tube are on the same central axis, a quick-release nut is provided at the top of the stainless steel tube, the self-locking assembly is located in the quick-release nut, a gas pipeline for septum purge gas is provided on the stainless steel tube, a gas circuit block is provided at the bottom of the stainless steel tube, the gas circuit block is located at the bottom of the insulation shell, and a two-position three-way solenoid valve is provided on the gas circuit block.

[0007] The top end of the stainless steel tube is the insertion end, and the bottom end of the stainless steel tube is the detection end. After the injection rod is placed in the stainless steel tube, it is tightened and sealed by a quick-release nut. The gas pipeline is used to allow gas to circulate and is connected to the internal space of the stainless steel tube. The gas circuit block is fixedly connected to the bottom end of the insulation shell. The two three-way solenoid valves on the gas circuit block are used to control the gas flow of the two valve ports. The three-way solenoid valve at the left end is used for emptying, and the solenoid valve at the right end is used for detecting gas.

[0008] Furthermore, an insulation shell is provided outside the stainless steel tube, and a heating component and a heating and cooling component are provided between the stainless steel tube and the insulation shell. The heating component is located on the side of the stainless steel tube close to the quick-release nut, and the heating and cooling component is located on the side of the stainless steel tube close to the gas path block. A partition layer is provided between the heating component and the heating and cooling component.

[0009] Its insulation shell can effectively prevent the temperature from dissipating, so that the temperature is concentrated on the stainless steel pipe, and the sample is processed. The heating component is used to provide thermal energy, and the heating and cooling component is used to condense the gas in the injection rod into liquid, so that the detection end can detect the sample. Then the insulation layer is made of the same material as the insulation shell, and the insulation layer is fixedly connected to the insulation layer. The insulation layer is used to prevent the heating component and the heating and cooling component from affecting each other. The heating and cooling component compresses the low-temperature and low-pressure gas into high-temperature and high-pressure gas through the compressor, providing enough energy to achieve refrigeration and heating. Then the condenser cools the high-temperature and high-pressure gas compressed by the compressor into liquid, releasing heat to the outside air, and finally the evaporator absorbs heat and transfers it to the cooled object. In the refrigeration mode, the refrigerant absorbs indoor heat and evaporates in the evaporator, and is then compressed by the compressor to increase its temperature and pressure. Release heat to the outside air in the condenser, return to liquid state, and finally reduce the pressure through the expansion valve and enter the evaporator again. Its compressor, condenser and evaporator are existing technologies.

[0010] Furthermore, the stainless steel pipe is provided with three sealing gaskets from top to bottom.

[0011] Its three sealing gaskets are located on the stainless steel tube, one at the top of the stainless steel tube close to the quick-release nut, and the remaining two are located at the bottom of the stainless steel tube close to the partition layer. Then gas pipelines are installed on the upper part of the sealing ring A and between the sealing rings B and C, which are used for the entry of chromatographic carrier gas and the exhaust of gas respectively.

[0012] Furthermore, the self-locking component includes an extrusion block and a connecting rod. The extrusion block is located at the bottom end of the quick-release nut, and the extrusion block is slidably connected to the quick-release nut. An extension rod is provided at the top of the extrusion block, and connecting rods are provided at both ends of the top of the extension rod. A limit plate is provided at the top of the extension rod, and a spring is provided at the top of the limit plate. One end of the spring is fixedly connected to the limit plate, and the other end of the spring is fixedly connected to the inner wall of the quick-release nut. One end of the connecting rod is rotatably connected to the extension rod, and an arc block is provided at the other end of the connecting rod. The arc block is fixedly connected to the connecting rod. A groove is provided at the bottom end of the quick-release nut, and the connecting rod body is slidably connected to the groove.

[0013] The self-locking component is used to fix one end of the injection rod. When the extrusion block is squeezed by one end of the injection rod, it will drive the extension rod to move, and the extension rod will drive the limit plate to move, and at the same time drive the connecting rod to move. The spring is used to return the limit plate to its original position without the influence of external force. The movement of the extension rod drives the connecting rod to move, and one end of the connecting rod is slidably connected to the groove, so that the movement of the connecting rod drives the movement of the arc block. There are two connecting rods and arc blocks. When the two arc blocks move, the arc blocks will mesh with each other to form a disc, and the disc cooperates with one end of the injection rod, so that the self-locking component works when the quick-release nut is tightened. When the quick-release nut is removed, the external force of the extrusion block will be relieved, and the extrusion block returns to its original position driven by the spring.

[0014] Furthermore, the gas concentration injection rod includes a gas filter, a water removal component A and an adsorption and desorption component A. The adsorption and desorption component A is located at the top of the gas circuit block, the gas filter is located at the top structure of the injection rod, the adsorption and desorption component A is located at the bottom structure of the injection rod, and the water removal component A is located between the gas filter and the adsorption and desorption component A.

[0015] The gas concentration injection rod is used for gas sampling, enrichment and concentration. From top to bottom, there are gas filter, water removal component A and adsorption desorption component A. The upper part of the injection rod is sealed with the middle stainless steel tube through sealing ring A. The bottom of the injection rod water removal component A is opened. After matching with the injector body, the opening is located between sealing ring B and sealing ring C. The bottom of the adsorption desorption component A is sealed with the gas path block. The adsorption desorption component A is filled with adsorption filler for adsorption and thermal analysis of organic matter. The adsorbent in the adsorption desorption component is generally a porous substance, such as activated carbon, silica gel, and alumina, which adsorbs the sample and then performs thermal analysis through the heating component.

[0016] Furthermore, the water concentration injection rod includes a liquid filter and an adsorption and desorption component B, the adsorption and desorption component B is located at the top of the gas path block, the liquid filter is located at the top structure of the injection rod, and the adsorption and desorption component B is located at the bottom structure of the injection rod.

[0017] The interior of the liquid concentration injection rod is composed of two parts, the upper part is a gas filter and the lower part is an adsorption and desorption component B. The upper part of the injection rod is sealed with the middle stainless steel tube through a sealing ring A, and the bottom of the adsorption and desorption component B is sealed with the gas path block. The adsorption and desorption component B is the same as the adsorption and desorption component A.

[0018] Furthermore, the built-in liner injection rod includes a rod body and a liner body, the rod body is located in the stainless steel tube, the liner body is located in the internal space of the rod body, and the liner body is fixedly connected to the rod body.

[0019] The built-in liner injection rod and its structure after installation are shown in the figure below. The injection rod is made of stainless steel as a whole, with a liner body installed inside. The upper part of the injection rod is sealed with the middle stainless steel tube through a sealing ring A, and the bottom is sealed with the gas path block.

[0020] Furthermore, the solid concentration injection rod includes an upper filter, a filling area, a lower filter, a connecting block, a water removal component B and an adsorption and desorption component C. The adsorption and desorption component C is located in the gas path block. The adsorption and desorption component is provided with a water removal component B at the top. A water absorption capillary is provided in the water removal component B. A connecting block is provided at the top of the water removal component B. A lower filter is provided at the top of the connecting block. A filling area is provided at the top of the lower filter. An upper filter is provided at the top of the filling area.

[0021] The sample rod is made of stainless steel as a whole and consists of six parts from top to bottom, namely the filter plate, the soil sample filling area, the filter plate bottom, the polytetrafluoroethylene connecting block, the water removal component B and the adsorption and desorption component C. The upper part of the injection rod is sealed with the middle stainless steel tube through the sealing ring A, and the bottom is sealed with the gas path block. The polytetrafluoroethylene connecting block is used for the connection and heat insulation of the upper and lower injection rods. The upper part of the injection rod is sealed with the middle stainless steel tube through the sealing ring A. The bottom position of the injection rod water removal component B is opened, and after matching with the injector body, the opening is located between the sealing ring B and the sealing ring C. The water removal component B is filled with a water absorption capillary. After refrigeration, the water in the sample is condensed on the capillary. The adsorption and desorption component C is the same as the adsorption and desorption component A.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, the test sample is placed in the injection rod, and no solvent needs to be added during the sample pretreatment process. The injection rod can be used repeatedly, and the sampling efficiency is improved.

[0024] 2. In the present invention, the sample pretreatment function is integrated with the sample injection function, the overall volume is small, the operation is simple, and it is convenient for staff to operate on site.

[0025] 3. The present invention is provided with a variety of injection rods, namely, a gas concentration injection rod, a water concentration injection rod, a built-in liner injection rod and a solid concentration injection rod, so that one injector can be suitable for the detection of a variety of media such as water, soil and gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the stainless steel tube of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the self-locking assembly of the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the gas concentration injection rod of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the water concentration injection rod of the present invention;

[0031] Figure 6 This is a schematic structural diagram of the built-in liner injection rod of the present invention;

[0032] Figure 7 It is a structural schematic diagram of the solid concentration injection rod of the present invention;

[0033] Figure 8 It is a structural schematic diagram of the gas circuit block of the present invention.

[0034] In the figure: 11, stainless steel pipe; 12, heating component; 13, heating and cooling component; 14, self-locking component; 141, extrusion block; 142, connecting rod; 143, extension rod; 144, limit plate; 145, spring; 15, quick-release nut; 151, groove; 16, gas path block; 17, insulation shell; 18, sealing gasket; 2, gas concentration injection rod; 21, gas filter; 22, water removal component A; 23, adsorption and desorption component A; 3, water concentration injection rod; 31, liquid filter; 32, adsorption and desorption component B; 4, built-in liner injection rod; 41, rod body; 42, liner body; 5, solid concentration injection rod; 51, on the filter; 52, filling area; 53, under the filter; 54, connecting block; 55, water removal component B; 56, adsorption and desorption component C. DETAILED DESCRIPTION

[0035] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0036] Example: Figures 1 to 8As shown, the present invention provides a technical solution for a multi-mode injection device for a chromatographic analysis instrument. The chromatographic analysis instrument is used to detect samples in the injection device. The injection device includes an injection rod, a stainless steel tube 11, a heating component 12 and a heating and cooling component 13. The injection rod is located inside the stainless steel tube 11. There are four types of injection rods, namely, a gas concentration injection rod 2, a water concentration injection rod 3, a built-in liner injection rod 4 and a solid concentration injection rod 5. A self-locking component 14 is provided at the top of the stainless steel tube 11, and the self-locking component 14 is used to fix the injection rod.

[0037] Specifically, the stainless steel tube 11 is used to store the replaceable injection rod, and the injection rod is provided with multiple modes. The heating component 12 is used to perform thermal processing on the sample in the stainless steel tube 11, and the heating and cooling component 13 is used to cooperate with the heating component 12 to process the sample. Then, there are four types of injection rods, a gas concentration injection rod 2 for gas sampling, enrichment and concentration, a water concentration injection rod 3 for water sample concentration, a built-in liner injection rod 4 for direct sampling of liquid and gas samples, and a solid concentration injection rod 5 for concentrated sampling of granular samples such as soil and sediments. Each injection rod has a different structure, and the self-locking component 14 is used to fix one end of the injection rod, so as to facilitate sampling between the detection end of the chromatographic analyzer and the injection rod.

[0038] like Figure 1 , Figure 2 As shown, the injection rod and the stainless steel tube 11 are on the same central axis, a quick-release nut 15 is provided at the top of the stainless steel tube 11, the self-locking assembly 14 is located in the quick-release nut 15, a gas pipeline for septum purge gas is provided on the stainless steel tube 11, and a gas circuit block 16 is provided at the bottom of the stainless steel tube 11. The gas circuit block 16 is located at the bottom of the insulation shell 17, and a two-position three-way solenoid valve is provided on the gas circuit block 16.

[0039] Specifically, the top end of the stainless steel tube 11 is the insertion end, and the bottom end of the stainless steel tube 11 is the detection end. After the injection rod is placed in the stainless steel tube 11, it is tightened and sealed by the quick-release nut 15. The gas pipeline is used to allow the gas to circulate and is connected to the internal space of the stainless steel tube 11. The gas circuit block 16 is fixedly connected to the bottom end of the insulation shell 17. The two three-way solenoid valves on the gas circuit block 16 are used to control the gas circulation of the two valve ports. The three-way solenoid valve at the left end is used for emptying, and the solenoid valve at the right end is used for detecting gas.

[0040] like Figure 1 , Figure 2 As shown, the stainless steel tube 11 is outer-coated with an insulation shell 17, and a heating component 12 and a heating and cooling component 13 are provided between the stainless steel tube 11 and the insulation shell 17. The heating component 12 is located on the side of the stainless steel tube 11 close to the quick-release nut 15, and the heating and cooling component 13 is located on the side of the stainless steel tube 11 close to the air circuit block 16, and a partition layer is provided between the heating component 12 and the heating and cooling component 13.

[0041] Specifically, the heat preservation shell 17 can effectively prevent the temperature from dissipating, so that the temperature is concentrated on the stainless steel tube 11, and the sample is processed. The heating component 12 is used to provide heat energy, and the heating and cooling component 13 is used to condense the gas in the injection rod into liquid, so that the detection end can detect the sample. Then the insulation layer is made of the same material as the heat preservation shell 17, and the insulation layer is fixedly connected to the heat preservation layer. The insulation layer is used to prevent the heating component 12 and the heating and cooling component 13 from affecting each other. The heating and cooling component 13 compresses the low-temperature and low-pressure gas into high-temperature and high-pressure gas through the compressor, providing enough energy to achieve refrigeration and heating. Then the condenser cools the high-temperature and high-pressure gas compressed by the compressor into liquid, releasing heat to the outside air, and finally the evaporator absorbs heat and transfers it to the cooled object. In the refrigeration mode, the refrigerant absorbs indoor heat and evaporates in the evaporator, and is then compressed by the compressor to increase its temperature and pressure. Release heat to the outside air in the condenser, return to liquid state, and finally reduce the pressure through the expansion valve and enter the evaporator again. The compressor, condenser and evaporator are prior art.

[0042] like Figure 2 As shown, the stainless steel pipe 11 is provided with three sealing gaskets 18 from top to bottom.

[0043] Specifically, three sealing gaskets 18 are located on the stainless steel tube 11, respectively located on the top of the stainless steel tube 11 close to the quick-release nut 15, and the remaining two are located on the bottom of the stainless steel tube 11 close to the partition layer. Then, gas pipelines are installed on the upper part of the sealing ring A and between the sealing rings B and C, which are used for the entry of chromatographic carrier gas and the exhaust of gas respectively.

[0044] like Figure 2 , Figure 3 As shown, the self-locking component 14 includes an extrusion block 141 and a connecting rod 142. The extrusion block 141 is located at the bottom end of the quick-release nut 15. The extrusion block 141 is slidably connected to the quick-release nut 15. An extension rod 143 is provided at the top of the extrusion block 141. Connecting rods 142 are provided at both ends of the top of the extension rod 143. A limiting plate 144 is provided at the top of the extension rod 143. A spring 145 is provided at the top of the limiting plate 144. One end of the spring 145 is fixedly connected to the limiting plate 144, and the other end of the spring 145 is fixedly connected to the inner wall of the quick-release nut 15. One end of the connecting rod 142 is rotatably connected to the extension rod 143. An arc block is provided at the other end of the connecting rod 142. The arc block is fixedly connected to the connecting rod 142. A groove 151 is provided at the bottom end of the quick-release nut 15, and the rod body 41 of the connecting rod 142 is slidably connected to the groove 151.

[0045] Specifically, the self-locking component 14 is used to fix one end of the injection rod. When the extrusion block 141 is squeezed by one end of the injection rod, it will drive the extension rod 143 to move, and the extension rod 143 will drive the limit plate 144 to move, and at the same time, it will also drive the connecting rod 142 to move. Under the influence of no external force, the spring 145 is used to make the limit plate 144 return to its original position. The movement of the extension rod 143 drives the connecting rod 142 to move, and one end of the connecting rod 142 is slidably connected to the groove 151, so that the movement of the connecting rod 142 drives the arc block to move. The connecting rod 142 and the arc block are provided with two. When the two arc blocks move, the arc blocks will mesh with each other to form a disc, and the disc will cooperate with one end of the injection rod, so that when the quick-release nut 15 is tightened, the self-locking component 14 works. When the quick-release nut 15 is disassembled, the external force of the extrusion block 141 will be unloaded, and the extrusion block 141 will return to its original position driven by the spring 145.

[0046] like Figure 4 As shown, the gas concentration injection rod 2 includes a gas filter 21, a water removal component A22 and an adsorption and desorption component A23. The adsorption and desorption component A23 is located at the top of the gas circuit block 16, the gas filter 21 is located at the top structure of the injection rod, the adsorption and desorption component A23 is located at the bottom structure of the injection rod, and the water removal component A22 is located between the gas filter 21 and the adsorption and desorption component A23.

[0047] Specifically, the gas concentration injection rod 2 is used for gas sampling, enrichment and concentration. From top to bottom, there are a gas filter 21, a water removal component A22 and an adsorption and desorption component A23. The upper part of the injection rod is sealed with the middle stainless steel tube 11 by a sealing ring A. The bottom of the injection rod water removal component A22 is opened, and after matching with the injector body, the opening is located between the sealing ring B and the sealing ring C. The bottom of the adsorption and desorption component A23 is sealed with the gas circuit block 16, and the adsorption and desorption component A23 is filled with adsorption filler for adsorption and thermal analysis of organic matter. The adsorbent in the adsorption and desorption component is generally a porous substance, such as activated carbon, silica gel, and alumina, which adsorbs the sample and then performs thermal analysis through a heating component.

[0048] like Figure 5 As shown, the water concentration injection rod 3 includes a liquid filter 31 and an adsorption and desorption component B32. The adsorption and desorption component B32 is located at the top of the gas circuit block 16, the liquid filter 31 is located at the top structure of the injection rod, and the adsorption and desorption component B32 is located at the bottom structure of the injection rod.

[0049] Specifically, the interior of the liquid concentration injection rod is composed of two parts, the upper part is the gas filter 21 and the lower part is the adsorption and desorption component B32. The upper part of the injection rod is sealed with the middle stainless steel tube 11 through the sealing ring A, and the bottom of the adsorption and desorption component B32 is sealed with the gas circuit block 16. The adsorption and desorption component B32 is the same as the adsorption and desorption component A23.

[0050] like Figure 6 As shown, the built-in liner injection rod 4 includes a rod body 41 and a liner body 42 . The rod body 41 is located in the stainless steel tube 11 , and the liner body 42 is located in the internal space of the rod body 41 . The liner body 42 is fixedly connected to the rod body 41 .

[0051] Specifically, the built-in liner injection rod 4 and its structure after installation are shown in the figure below. The injection rod is made of stainless steel as a whole, and a liner body 42 is installed inside. The upper part of the injection rod is sealed with the middle stainless steel tube 11 through a sealing ring A, and the bottom is sealed with the gas circuit block 16.

[0052] like Figure 7 , Figure 8 As shown, the solid concentration injection rod 5 includes an upper filter 51, a filling area 52, a lower filter 53, a connecting block 54, a water removal component B55 and an adsorption and desorption component C56. The adsorption and desorption component C56 is located at the gas circuit block 16. The adsorption and desorption component C56 is provided with a water removal component B55 at the top. The water removal component B55 is provided with a water absorption capillary. The top of the water removal component B55 is provided with a connecting block 54. The top of the connecting block 54 is provided with a lower filter 53. The top of the lower filter 53 is provided with a filling area 52. The top of the filling area 52 is provided with an upper filter 51.

[0053] Specifically, the sample rod is made of stainless steel as a whole, and consists of six parts from top to bottom, namely, the filter plate 51, the soil sample filling area 52, the filter plate bottom 53, the polytetrafluoroethylene connecting block 54, the water removal component B55 and the adsorption and desorption component C56. The upper part of the injection rod is sealed with the middle stainless steel tube 11 by a sealing ring A, and the bottom is sealed with the gas circuit block 16. The polytetrafluoroethylene connecting block 54 is used for the connection and heat insulation of the upper and lower injection rods. The upper part of the injection rod is sealed with the middle stainless steel tube 11 by a sealing ring A. The injection rod water removal component B55 has a hole at the bottom, and after matching with the sampler body, the hole is located between the sealing ring B and the sealing ring C. The water removal component B55 is filled with a water absorption capillary. After refrigeration, the water in the sample is condensed on the capillary. The adsorption and desorption component C56 is the same as the adsorption and desorption component A23.

[0054] Working principle: The injection port is composed of an injection port body and a replaceable injection rod. The four different injection tubes are gas concentration injection rod 2, water concentration injection rod 3, built-in liner injection rod 4 and solid concentration injection rod 5. They are set according to needs. The middle of the injection port body is a stainless steel tube 11 for installing the replaceable injection rod. The heating component 12 and the heating and cooling component 13 are thermally isolated by an insulation layer. The inner sides of the heating component 12 and the heating and cooling component 13 are close to the middle stainless steel tube 11, and the outer sides are wrapped with an insulation layer for insulation. A quick-release nut 15 is installed on the upper part of the middle stainless steel tube 11, and the quick-release nut 15 and the stainless steel tube 11 are sealed by a sealing gasket. A gas pipeline is installed on the quick-release nut 15 for gasket purge gas. Three sealing rings are installed from top to bottom on the middle stainless steel tube 11, namely sealing ring A, sealing ring B and sealing ring C. The three sealing rings are located between the injection rod and the stainless steel tube 11 for sealing. A gas circuit block 16 is installed at the lower part of the middle stainless steel tube 11, and the gas circuit block 16 is installed with solenoid valve A and solenoid valve B for controlling two gas lines.

[0055] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-mode sample injection device for a chromatographic analysis instrument, characterized in that: The injection device comprises an injection rod, a stainless steel tube (11), a heating component (12) and a heating and cooling component (13); the injection rod is located inside the stainless steel tube (11); there are four types of injection rods, namely a gas concentration injection rod (2), a water concentration injection rod (3), a built-in liner injection rod (4) and a solid concentration injection rod (5); a self-locking component (14) is provided at the top end of the stainless steel tube (11); the self-locking component (14) is used to fix the injection rod.

2. A multi-mode sample injection device for a chromatographic analysis instrument according to claim 1, characterized in that: The injection rod and the stainless steel tube (11) are located on the same central axis; a quick-release nut (15) is provided at the top of the stainless steel tube (11); the self-locking assembly (14) is located in the quick-release nut (15); a gas pipeline for septum purge gas is provided on the stainless steel tube (11); a gas circuit block (16) is provided at the bottom of the stainless steel tube (11); the gas circuit block (16) is located at the bottom of the heat-insulating shell (17); and a two-position three-way solenoid valve is provided on the gas circuit block (16).

3. A multi-mode sample injection device for a chromatographic analysis instrument according to claim 2, characterized in that: The stainless steel tube (11) is provided with an insulating shell (17) on its outer sleeve, a heating component (12) and a heating and cooling component (13) are provided between the stainless steel tube (11) and the insulating shell (17), the heating component (12) is located on a side of the stainless steel tube (11) close to the quick-release nut (15), the heating and cooling component (13) is located on a side of the stainless steel tube (11) close to the gas path block (16), and a partition layer is provided between the heating component (12) and the heating and cooling component (13).

4. The multi-mode sample injection device for a chromatographic analysis instrument according to claim 3, characterized in that: The stainless steel pipe (11) is provided with three sealing gaskets (18) from top to bottom.

5. The multi-mode sample injection device for a chromatographic analysis instrument according to claim 4, characterized in that: The self-locking assembly (14) comprises an extrusion block (141) and a connecting rod (142); the extrusion block (141) is located at the bottom end of the quick-release nut (15); the extrusion block (141) is slidably connected to the quick-release nut (15); an extension rod (143) is provided at the top end of the extrusion block (141); connecting rods (142) are provided at both ends of the top of the extension rod (143); a limit plate (144) is provided at the top end of the extension rod (143); a spring (145) is provided at the top end of the limit plate (144). One end of the spring (145) is fixedly connected to the limit plate (144), the other end of the spring (145) is fixedly connected to the inner wall of the quick-release nut (15), one end of the connecting rod (142) is rotatably connected to the extension rod (143), the other end of the connecting rod (142) is provided with an arc block, the arc block is fixedly connected to the connecting rod (142), a groove (151) is provided at the bottom end of the quick-release nut (15), and the connecting rod (142) rod body (41) is slidably connected to the groove (151).

6. The multi-mode sample injection device for a chromatographic analysis instrument according to claim 1, characterized in that: The gas concentration injection rod (2) comprises a gas filter (21), a water removal component A (22) and an adsorption and desorption component A (23), wherein the adsorption and desorption component A (23) is located at the top of the gas path block (16), the gas filter (21) is located at the top structure of the injection rod, the adsorption and desorption component A (23) is located at the bottom structure of the injection rod, and the water removal component A (22) is located between the gas filter (21) and the adsorption and desorption component A (23).

7. The multi-mode sample injection device for a chromatographic analysis instrument according to claim 1, characterized in that: The water concentration injection rod (3) comprises a liquid filter (31) and an adsorption and desorption component B (32), wherein the adsorption and desorption component B (32) is located at the top of the gas path block (16), the liquid filter (31) is located at the top structure of the injection rod, and the adsorption and desorption component B (32) is located at the bottom structure of the injection rod.

8. The multi-mode sample injection device for a chromatographic analysis instrument according to claim 1, characterized in that: The built-in liner injection rod (4) comprises a rod body (41) and a liner body (42); the rod body (41) is located in the stainless steel tube (11); the liner body (42) is located in the internal space of the rod body (41); and the liner body (42) is fixedly connected to the rod body (41).

9. The multi-mode sample injection device for a chromatographic analysis instrument according to claim 1, characterized in that: The solid concentration injection rod (5) comprises an upper filter (51), a filling area (52), a lower filter (53), a connecting block (54), a water removal component B (55) and an adsorption and desorption component C (56). The adsorption and desorption component C (56) is located on the gas path block (16). The top of the adsorption and desorption component C (56) is provided with a water removal component B (55). The water removal component B (55) is provided with a water absorption capillary. The top of the water removal component B (55) is provided with a connecting block (54). The top of the connecting block (54) is provided with a lower filter (53). The top of the lower filter (53) is provided with a filling area (52). The top of the filling area (52) is provided with an upper filter (51).

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