A high-temperature sample injection device for gas chromatograph and a gas chromatograph having the same

Abstract

The invention discloses a high-temperature sample injection device and a sealing device for a gas chromatograph, the sealing device comprising a sealing plate and a limiting block, the upper end surface of the sealing plate is provided with a guide groove, the end of the guide groove is penetrated with a drainage hole, a first magnetic block is provided on a side of the drainage hole away from the guide groove, and the limiting block can cooperate with the sealing plate; the first magnetic block can be embedded in the lower end opening of a transmission chamber through magnetic cooperation with the second magnetic block, at this time, the lower half of the transmission chamber forms a closed sealing chamber, when the first piston bar drives the rack to move downward, the second piston bar moves downward, and due to the effect of air pressure, the first magnetic block can be pushed out of the transmission chamber, so that the sealing plate is rotated to open, so that the reagent flows to the drainage hole through the guide groove and enters the reaction chamber, after the reagent injection is completed, the sealing plate is closed through the magnetic effect of the first magnetic block and the second magnetic block, which can effectively block the transfer of heat to the sample tube.

Description

Technical Field

[0001] The invention relates to the technical field of gas chromatographs, and in particular to a high-temperature sample injection device and a sealing device for a gas chromatograph. Background Art

[0002] Gas chromatograph is an instrument that uses chromatographic separation and detection technology to conduct qualitative and quantitative analysis of complex multi-component mixtures. It can usually be used to analyze organic matter in soil that is thermally stable and has a boiling point not exceeding 500°C, such as volatile organic matter, organochlorine, organophosphorus, polycyclic aromatic hydrocarbons, phthalates, etc.

[0003] In the prior art, when replacing the injection pad, it is necessary to adjust the tightness of the injection pad by visual observation or empirical judgment. The nut cannot be screwed too loosely or too tightly. If it is too loose, the diameter of the pinhole on the injection pad will be too large, resulting in poor air tightness of the injection device. If it is too tight, the pressure on the wall of the pinhole on the injection pad will be too high, making it difficult for the needle tip of the sampling needle to be inserted into the pinhole, and the injection pad will be easily damaged during insertion. However, the accuracy of visual observation or empirical judgment is not high.

[0004] In the chromatographic separation technology and detection technology in the prior art, high-temperature reactions are often accompanied, and a sealing device is required to organically resist the transfer of heat during the reaction to the sample transfer tube.

[0005] Therefore, it is necessary to provide a high-temperature sample injection device for a gas chromatograph and a gas chromatograph having the same to solve the above-mentioned technical problems. Summary of the invention

[0006] In order to solve the problems in the prior art that the high-temperature sample injection device of the gas chromatograph is inconvenient to replace the sample injection pad and the chromatographic separation technology and detection technology are often accompanied by high-temperature reactions, the present invention provides the following technical solutions:

[0007] A closing device comprises a sealing plate and a limiting block, wherein the upper end surface of the sealing plate is provided with a guide groove, the end of the guide groove is penetrated with a guide hole, a first magnetic block is provided on the side of the guide hole away from the guide groove, and the limiting block can cooperate with the sealing plate. Through the cooperation of the limiting block and the sealing plate, the first magnetic block and the second magnetic block can still have a magnetic connection after the sealing plate is opened.

[0008] Preferably, the guide groove is composed of a circular groove and a straight groove, and the circular groove is arranged in the middle of the upper end surface of the sealing plate. The circular groove can receive the reagent entering from the sample delivery tube, and the straight groove can transport the reagent into the drainage hole.

[0009] A high-temperature sample injection device for a gas chromatograph comprises the above-mentioned closing device, a sample tube, a nut threadedly mounted on the top of the sample tube, a needle guide tube fixedly mounted on the top of the nut, and a sample injection pad squeezed and fixed between the nut and the sample tube, wherein the sample injection pad is provided with a needle hole through the upper and lower walls, the needle guide tube is connected with the sample tube through the needle hole, an annular groove is provided on the bottom wall of the sample injection pad, an annular airbag is fixedly mounted on the top of the sample tube, the annular airbag is located in the annular groove, the annular airbag is connected to a display element through a connecting pipe, and the display element displays the pressure change of the inner cavity of the annular airbag through a pressure difference, the above-mentioned closing device is arranged on the lower end surface of the sample tube, and when replacing the sample injection pad, first screw the screw to close the sealing device. Remove the nut and take off the guide needle tube, then take off the discarded injection pad, then place the injection pad on the top of the sample tube, then place the guide needle tube on the injection pad, and finally screw on the nut. In the process of tightening the nut, the pressure of the nut on the injection pad gradually increases, so that the injection pad is compressed and deformed. At the same time, the injection pad is pressed on the annular airbag, so that the annular airbag is compressed and deformed, and the volume of the annular airbag is reduced, so that the pressure in the inner cavity of the annular airbag is increased, and the annular airbag is connected to the display element through the connecting tube, and the pressure in the annular airbag can be displayed by the display element, so that the pressure degree of the injection pad can be judged by the display element. Compared with visual observation and experience, replacing the injection pad is more convenient and more accurate.

[0010] Preferably, the display element includes a mounting seat, a transparent fixed tube and a colored droplet, the transparent fixed tube is fixedly mounted on the top of the mounting seat, a capillary is fixedly mounted in the inner cavity of the transparent fixed tube, a colored droplet is arranged in the inner cavity of the capillary, and the bottom end of the capillary is connected to the annular airbag through a connecting tube. When the pressure in the inner cavity of the annular airbag increases after being pressurized, the pressure below the colored droplet increases while the pressure above the colored droplet remains unchanged. Therefore, the pressure at the bottom of the colored droplet is greater than the pressure at the top of the colored droplet, causing the colored droplet to move upward, thereby increasing the pressure above the colored droplet until the pressure above the colored droplet is equal to the pressure below the colored droplet. In this way, the pressure in the inner cavity of the annular airbag can be judged by observing the position of the colored droplet, thereby indirectly judging the degree of compression of the injection pad. When using it for the first time, record the position of the colored droplet when the injection pad is in the best state. When replacing the same type of injection pad later, you only need to observe the position of the colored droplet while tightening the nut, and stop tightening the nut when the colored droplet moves to the recorded position.

[0011] Preferably, a heat-insulating ball is rotatably installed in the inner cavity of the sample tube, and two rotating shafts are symmetrically fixedly installed on the outer wall of the heat-insulating ball. The heat-insulating ball is rotatably installed in the sample tube through the two rotating shafts. A connecting hole is opened on the heat-insulating ball, and the aperture of the connecting hole is the same as the inner diameter of the sample tube. The heat-insulating ball can rotate longitudinally in the sample tube. When injecting samples, the heat-insulating ball rotates until the axis of the connecting hole is in a vertical state, so that the sample tube is connected to the needle guide tube through the connecting hole, so that the sampling needle can pass through the connecting hole to inject the sample liquid into the sample inlet gas path of the gas chromatograph. After the injection is completed, the heat-insulating ball rotates until the axis of the connecting hole is in a horizontal state, so that the ball wall of the heat-insulating ball closes the connecting hole. At this time, the heat-insulating ball plays a role of heat insulation and sealing, preventing the high-temperature airflow in the gas chromatograph from directly contacting the injection pad.

[0012] Preferably, a transmission chamber is provided in the cylinder wall of the sample transport cylinder, and a transmission mechanism is fixedly installed in the inner cavity of the transmission chamber, and the transmission mechanism comprises an inner air bag, an air delivery pipe, a piston cylinder, a first piston, a first piston rod, a rack and a gear, and the gear and the rack are both located in the transmission chamber, and the gear is fixedly installed at the end of the rotating shaft away from the heat insulation ball, the inner air bag is fixedly installed in the inner cavity of the annular air bag, and the piston cylinder is fixedly installed in the cylinder wall of the sample transport cylinder, the top of the piston cylinder is connected with the bottom end of the air delivery pipe, and the piston cylinder is connected with the inner air bag through the air delivery pipe, and the inner cavity of the piston cylinder is slidably installed with the first piston, and the bottom end of the first piston is fixedly installed with a first piston rod, and the bottom end of the first piston rod is fixedly installed with a rack, and the rack is meshingly connected with the gear, and the heat insulation ball can be controlled to rotate through the transmission mechanism. When the sampling needle needle passes through the sampling pad, since the diameter of the sampling needle needle is larger than the aperture of the needle hole, the aperture of the needle hole expands, and the needle hole expands. When the cam is inflated, the annular groove at the bottom of the sampling pad shrinks under pressure, and the wall of the annular groove presses on the annular airbag to compress the annular airbag. At the same time, the inner airbag in the inner cavity of the annular airbag shrinks due to the pressure of the annular airbag, and the gas in the inner airbag enters the piston cylinder through the air supply pipe, thereby pushing the first piston to move downward through the gas. When the first piston moves downward, the rack moves downward through the first piston rod, and the rack drives the gear to rotate when it moves downward. The gear drives the heat insulation ball to rotate through the rotating shaft. When the needle of the sampling needle is pulled out of the sampling pad, the inner diameter of the needle hole on the sampling pad shrinks, and the annular groove expands, so that the inner airbag in the annular airbag expands, and the gas in the piston cylinder enters the inner airbag, and the first piston moves upward. When the first piston moves upward, the rack moves upward through the first piston rod, and the rack drives the gear to rotate when it moves upward. The gear drives the heat insulation ball to rotate through the rotating shaft, so that when the sampling needle is inserted, the heat insulation ball automatically rotates to connect the sample tube with the needle guide tube, and when the sampling needle is pulled out, the heat insulation ball automatically rotates to separate the sample tube from the needle guide tube.

[0013] Preferably, the transmission chamber passes through the sample tube, the bottom end of the rack is fixedly mounted with a second piston rod 98, the bottom end of the second piston rod is fixedly mounted with a second piston, and the bottom end of the second piston is fixedly mounted with a second magnet. The first magnet can be embedded in the lower opening of the transmission chamber through magnetic cooperation with the second magnet, and the lower half of the transmission chamber forms a closed sealing chamber. When the first piston bar drives the rack to move downward, the second piston bar moves downward, and the first magnet can be pushed out of the transmission chamber due to the action of air pressure, so that the sealing plate can be rotated to open, so that the reagent flows through the guide groove to the drainage hole and enters the reaction chamber. After the reagent injection is completed, the sealing plate is closed through the magnetic action of the first magnet and the second magnet, which can effectively block the transfer of heat to the sample tube.

[0014] Preferably, the sealing plate covers the bottom of the through hole of the sample delivery tube, and the sealing plate is rotatably connected to the sample delivery tube. The sealing plate can be opened or closed by rotation according to the action of the piston or the action of magnetism.

[0015] Preferably, the first magnetic block can cooperate with the transmission chamber. The first magnetic block can be embedded in the lower opening of the transmission chamber through magnetic cooperation with the second magnetic block.

[0016] Preferably, the sealing plate is made of a heat-insulating material to effectively block the transfer of heat to the sample tube. In the high-temperature sample injection device for a gas chromatograph and the gas chromatograph having the same described in the present invention, the first magnetic block of the present invention can be embedded in the lower opening of the transmission chamber through magnetic cooperation with the second magnetic block. At this time, the lower half of the transmission chamber forms a closed sealing chamber, and the movement of the rack is organically coordinated with the second piston rod. When the first piston rod drives the rack to move downward, the second piston rod moves downward. Due to the effect of air pressure, the first magnetic block can be pushed out of the transmission chamber, so that the sealing plate is rotated to open, so that the reagent flows through the guide groove to the drainage hole and enters the reaction chamber. After the reagent injection is completed, the sealing plate is closed through the magnetic effect of the first magnetic block and the second magnetic block, which can effectively block the transfer of heat to the sample tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the main cross-sectional structure of the present invention;

[0020] Figure 3 The present invention Figure 2 A schematic diagram of the enlarged structure at point A;

[0021] Figure 4 The present invention Figure 2A schematic diagram of the enlarged structure at B;

[0022] Figure 5 The present invention Figure 2 A schematic diagram of the enlarged structure at C;

[0023] Figure 6 3D schematic diagram of the heat-insulating ball of the present invention;

[0024] Figure 7 is a schematic diagram of the three-dimensional structure of the heat-insulating ball of the present invention from another perspective;

[0025] Figure 8 It is a schematic diagram of the cross-sectional structure of the heat-insulating ball of the present invention;

[0026] Fig. 9 It is a schematic diagram of the cross-sectional structure of the heat-insulating ball of the present invention when the heat-expandable airbag is expanded;

[0027] Fig.10 It is a schematic diagram of the cross-sectional structure of the heat-insulating ball of the present invention when the heat-expandable airbag is not expanded;

[0028] Fig.11 The present invention Figure 2 A schematic diagram of the structure at D of FIG.

[0029] Fig.12 It is a top view schematic diagram of the sealing plate of the present invention.

[0030] In the figure: 1, sample delivery tube; 101, transmission chamber; 2, sample injection pad; 201, needle hole; 202, annular groove; 3, nut; 4, needle guide tube; 401, fixed flange; 5, annular airbag; 6, connecting tube; 7, display element; 71, mounting seat; 72, transparent fixed tube; 721, capillary; 73, colored droplet; 8, heat insulation ball; 801, rotating shaft; 802, connecting hole; 9, transmission mechanism; 91, inner airbag; 92 , air pipe; 93, piston cylinder; 94, first piston; 95, first piston rod; 96, rack; 97, gear; 98, second piston rod; 99, second piston; 910, second magnetic block 10, elastic film; 11, thermal insulation particles; 12, thermal expansion airbag; 13, heat conduction plate; 14, closing device; 1401, sealing plate; 1402, guide groove; 1403, drainage hole; 1404, first magnetic block; 1405, limit block. DETAILED DESCRIPTION

[0031] A sealing device includes a sealing plate 1401 and a limiting block 1405. The upper end surface of the sealing plate 1401 is provided with a guide groove 1402, and the end of the guide groove 1402 is penetrated with a guide hole 1403. The side of the guide hole 1403 away from the guide groove 1402 is provided with a first magnetic block 1404, and the limiting block 1405 can cooperate with the sealing plate 1401. Through the cooperation of the limiting block and the sealing plate, the first magnetic block and the second magnetic block can still have a magnetic connection after the sealing plate is opened.

[0032] Specifically, the guide groove 1402 is composed of a circular groove and a straight groove, and the circular groove is arranged in the middle of the upper end surface of the sealing plate 1401. The circular groove can receive the reagent entering from the sample delivery tube 1, and the straight groove can transport the reagent into the drainage hole.

[0033] A high-temperature sample injection device for a gas chromatograph comprises the sealing device 14, a sample tube 1, a nut 3 threadedly mounted on the top of the sample tube 1, a needle guide tube 4 fixedly mounted on the top of the nut 3, and a sample injection pad 2 squeezed and fixed between the nut 3 and the sample tube 1, wherein the sample injection pad 2 is provided with a needle hole 201 through the upper and lower walls, the needle guide tube 4 is connected to the sample tube 1 through the needle hole 201, an annular groove 202 is provided on the bottom wall of the sample injection pad 2, an annular airbag 5 is fixedly mounted on the top of the sample tube 1, the annular airbag 5 is located in the annular groove 202, the annular airbag 5 is connected to a display element 7 through a connecting tube 6, and the display element 7 displays the pressure change of the inner cavity of the annular airbag 5 through a pressure difference, the sealing device 14 is arranged on the lower end surface of the sample tube 1, and when the sample injection pad 2 is subjected to the pressure test, the sealing device 14 is provided on the lower end surface of the sample tube 1. When replacing, first unscrew the nut 3 and remove the guide needle tube 4, then remove the discarded sampling pad 2, then place the sampling pad 2 on the top of the sample tube 1, and then place the guide needle tube 4 on the sampling pad 2, and finally screw on the nut 3. In the process of tightening the nut 3, the pressure of the nut 3 on the sampling pad 2 gradually increases, so that the sampling pad 2 is compressed and deformed. At the same time, the sampling pad 2 is pressed on the annular airbag 5, so that the annular airbag 5 is compressed and deformed, and the volume of the annular airbag 5 is reduced, so that the pressure in the inner cavity of the annular airbag 5 is increased, and the annular airbag 5 is connected to the display element 7 through the connecting tube 6. The pressure in the annular airbag 5 can be displayed by the display element 7, so that the pressure degree of the sampling pad 2 can be judged by the display element 7. Compared with naked eye observation and experience judgment, replacing the sampling pad 2 is more convenient and more accurate.

[0034] Specifically, the display element 7 includes a mounting seat 71, a transparent fixed tube 72 and a colored droplet 73. The transparent fixed tube 72 is fixedly installed on the top of the mounting seat 71, and a capillary 721 is fixedly installed in the inner cavity of the transparent fixed tube 72. The inner cavity of the capillary 721 is provided with a colored droplet 73, and the bottom end of the capillary 721 is connected to the annular airbag 5 through a connecting tube 6. When the pressure in the inner cavity of the annular airbag 5 increases after being pressurized, since the pressure below the colored liquid droplet 73 increases, while the pressure above the colored liquid droplet 73 remains unchanged, the pressure at the bottom of the colored liquid droplet 73 is greater than the pressure at the top of the colored liquid droplet 73, causing the colored liquid droplet 73 to move upward, thereby increasing the pressure above the colored liquid droplet 73 until the pressure above the colored liquid droplet 73 is equal to the pressure below the colored liquid droplet 73. In this way, the pressure in the inner cavity of the annular airbag 5 can be judged by observing the position of the colored liquid droplet 73, thereby indirectly judging the degree of compression of the sampling pad 2. When using it for the first time, record the position of the colored liquid droplet 73 when the sampling pad 2 is in the best state. When replacing the same type of sampling pad 2 subsequently, you only need to observe the position of the colored liquid droplet 73 while tightening the nut 3, and stop tightening the nut 3 when the colored liquid droplet 73 moves to the recorded position.

[0035] Specifically, the inner cavity of the sample tube 1 is rotatably mounted with a heat-insulating ball 8, and the outer wall of the heat-insulating ball 8 is symmetrically fixedly mounted with two rotating shafts 801. The heat-insulating ball 8 is rotatably mounted in the sample tube 1 through the two rotating shafts 801. The heat-insulating ball 8 is provided with a connecting hole 802, and the aperture of the connecting hole 802 is the same as the inner diameter of the sample tube 1. The heat-insulating ball 8 can rotate longitudinally in the sample tube 1. When injecting samples, the heat-insulating ball 8 rotates until the axis of the connecting hole 802 is in a vertical state, so that the sample tube 1 is connected with the needle guide tube 4 through the connecting hole 802, so that the sampling needle can pass through the connecting hole 802 to inject the sample liquid into the sample inlet gas path of the gas chromatograph. After the injection is completed, the heat-insulating ball 8 rotates until the axis of the connecting hole 802 is in a horizontal state, so that the ball wall of the heat-insulating ball 8 closes the connecting hole 802. At this time, the heat-insulating ball 8 plays the role of heat insulation and sealing, preventing the high-temperature airflow in the gas chromatograph from directly contacting the injection pad 2.

[0036] Specifically, a transmission chamber 101 is opened in the wall of the sample delivery tube 1, and a transmission mechanism 9 is fixedly installed in the inner cavity of the transmission chamber 101. The transmission mechanism 9 includes an inner air bag 91, an air delivery pipe 92, a piston cylinder 93, a first piston 94, a first piston rod 95, a rack 96 and a gear 97. The gear 97 and the rack 96 are both located in the transmission chamber 101. The gear 97 is fixedly installed at one end of the rotating shaft 801 away from the insulation ball 8. The inner air bag 91 is fixedly installed in the inner cavity of the annular air bag 5. The piston cylinder 93 is fixedly installed in the wall of the sample delivery tube 1. The top of the piston cylinder 93 is connected to the bottom of the air delivery pipe 92, and the piston cylinder 93 is connected to the inner air bag 91 through the air delivery pipe 92. The inner cavity of the piston cylinder 93 is slidably mounted with a first piston 94, and the bottom end of the first piston 94 is fixedly mounted with a first piston rod 95. The bottom end of the first piston rod 95 is fixedly mounted with a rack 96, and the rack 96 is meshed and connected with a gear 97. The transmission mechanism 9 can control the heat insulation ball 8 to rotate. When the sampling needle needle passes through the sampling pad 2, since the diameter of the sampling needle needle is larger than the aperture of the needle hole 201, the aperture of the needle hole 201 expands and becomes larger, and the needle hole 20 When the annular groove 202 at the bottom of the sampling pad 2 expands, the annular groove 202 is compressed and contracted, and the wall of the annular groove 202 presses on the annular airbag 5 to compress the annular airbag 5. At the same time, the inner airbag 91 in the inner cavity of the annular airbag 5 is compressed by the pressure of the annular airbag 5, and the gas in the inner airbag 91 enters the piston cylinder 93 through the gas pipe 92, thereby pushing the first piston 94 to move downward. When the first piston 94 moves downward, it drives the rack 96 to move downward through the first piston rod 95. When the rack 96 moves downward, it drives the gear 97 to rotate. The gear 97 drives the heat insulation ball 8 to rotate through the rotating shaft 801. When the needle of the sampling needle is pulled out of the sampling pad 2 When the first piston 94 moves upward, it drives the rack 96 to move upward through the first piston rod 95. When the rack 96 moves upward, it drives the gear 97 to rotate. The gear 97 drives the heat-insulating ball 8 to rotate through the rotating shaft 801, so that when the injection needle is inserted, the heat-insulating ball 8 automatically rotates to connect the sample delivery tube 1 with the needle guide tube 4, and when the injection needle is pulled out, the heat-insulating ball 8 automatically rotates to separate the sample delivery tube 1 from the needle guide tube 4.

[0037] Specifically, the transmission chamber 101 passes through the sample tube 1, and the bottom end of the rack 96 is fixedly mounted with a second piston rod 98, the bottom end of the second piston rod 98 is fixedly mounted with a second piston 99, and the bottom end of the second piston 99 is fixedly mounted with a second magnetic block 910. The first magnetic block can be embedded in the lower opening of the transmission chamber 101 through magnetic cooperation with the second magnetic block. At this time, the lower half of the transmission chamber 101 forms a closed sealing chamber. When the first piston 94 drives the rack 96 to move downward, the second piston moves downward. Due to the effect of air pressure, the first magnetic block can be pushed out of the transmission chamber 101, so that the sealing plate is rotated to open, so that the reagent flows through the guide groove to the drainage hole and enters the reaction chamber. After the reagent injection is completed, the sealing plate is closed through the magnetic effect of the first magnetic block and the second magnetic block, which can effectively block the transfer of heat to the sample tube 1.

[0038] Specifically, the sealing plate 1401 covers the bottom of the through hole of the sample delivery tube 1, and the sealing plate 1401 is rotatably connected to the sample delivery tube 1. The sealing plate can be opened or closed by rotation according to the action of the piston or the action of magnetism.

[0039] Specifically, the first magnetic block 1404 can cooperate with the transmission chamber 101. The first magnetic block can be embedded in the lower opening of the transmission chamber 101 through magnetic cooperation with the second magnetic block.

[0040] Specifically, the sealing plate 1401 is made of a heat-insulating material to effectively block the transfer of heat to the sample tube 1 .

[0041] Specifically, a cavity is provided in the heat-insulating ball 8, and the cavity is separated from the communicating hole 802 by an elastic membrane 10, and the elastic membrane 10 is located at the opening of the communicating hole 802. A heat-expandable airbag 12 is provided in the cavity, and when the communicating hole 802 rotates to a horizontal state, the heat-expandable airbag 12 is located at the bottom of the inner cavity of the heat-insulating ball 8, and the inner cavity of the heat-expandable airbag 12 is filled with a gas with a high thermal expansion coefficient. The heat-expandable airbag 12 expands when heated and contracts when not heated. The cavity is filled with heat-insulating particles 11, and the heat-insulating particles 11 are made of heat-insulating materials, such as carbon. The particles of oxides and / or nitrides and / or borides can play a role in heat insulation. When the gas chromatograph analyzes the sample, the heat of the sample air inlet path acts on the bottom of the insulation ball 8, causing the heat expansion airbag 12 to expand due to the heat. After the heat expansion airbag 12 expands, the pressure in the inner cavity of the insulation ball 8 increases, causing the elastic membrane 10 to expand toward the connecting hole 802, and the insulation particles 11 enter the cavity formed after the elastic membrane 10 expands, which increases the number of insulation particles 11 at the opening of the connecting hole 802, thereby slowing down the heat transfer from the edge of the insulation ball 8 upward.

[0042] Specifically, two elastic membranes 10 are provided, and the two elastic membranes 10 are respectively located at the two openings of the connecting hole 802 . By providing two elastic membranes 10 , a part of the thermal insulation particles 11 can be transferred to the cavity formed by the deformation of the two elastic membranes 10 .

[0043] Specifically, a fixing flange 401 is provided at the bottom end of the guide needle cylinder 4, the top inner wall of the nut 3 is pressed on the fixing flange 401, and the bottom wall of the fixing flange 401 is pressed on the top wall of the sampling pad 2. The fixing flange 401 at the bottom of the guide needle cylinder 4 enables the nut 3 to fix the guide needle cylinder 4 above the sampling pad 2, and the fixing flange 401 can increase the area of ​​the bottom wall of the guide needle cylinder 4, so that the guide needle cylinder 4 is placed on the sampling pad 2 more stably, and the pressure on the sampling pad 2 can be increased, so as to better fix the sampling pad 2.

[0044] Specifically, when the axis line of the connecting hole 802 is in a horizontal state, a heat conducting plate 13 is fixedly installed on the bottom end of the heat insulating ball 8. The heat conducting plate 13 has a high thermal conductivity and its shape is adapted to the heat insulating ball 8. The heat conducting plate 13 can better transfer heat to the thermal expansion airbag 12, so that the thermal expansion airbag 12 heats up faster and expands faster, thereby enabling the elastic membrane 10 to deform faster, reducing the amount of heat transferred upward through the opening of the connecting hole 802 before the elastic membrane 10 is deformed.

[0045] The first magnetic block can be embedded in the lower opening of the transmission chamber 101 through magnetic cooperation with the second magnetic block. At this time, the lower half of the transmission chamber 101 forms a closed sealing chamber, and the movement of the rack 96 is organically coordinated with the second piston rod. When the first piston 94 drives the rack 96 to move downward, the second piston moves downward. Due to the effect of air pressure, the first magnetic block can be pushed out of the transmission chamber 101, so that the sealing plate can be rotated to open, so that the reagent flows through the guide groove to the drainage hole and enters the reaction chamber. After the reagent injection is completed, the sealing plate is closed through the magnetic effect of the first magnetic block and the second magnetic block, which can effectively block the transfer of heat to the sample tube 1.

Claims

1. A high temperature sample introduction device for a gas chromatograph, characterized in that: A sealing device is included, the sealing device includes a sealing plate and a limiting block, the upper end surface of the sealing plate is provided with a guide groove, the end of the guide groove is penetrated with a drainage hole, the drainage hole is provided with a first magnetic block on the side away from the guide groove, and the limiting block can cooperate with the sealing plate; The guide groove is composed of a circular groove and a straight groove, and the circular groove is arranged in the middle position of the upper end surface of the sealing plate; It also includes a sample delivery tube, a nut threadedly mounted on the top of the sample delivery tube, a needle guide tube fixedly mounted on the top of the nut, and a sample injection pad squeezed and fixed between the nut and the sample delivery tube, the sample injection pad having a needle hole formed through the upper and lower walls, the needle guide tube being connected to the sample delivery tube through the needle hole, an annular groove formed on the bottom wall of the sample injection pad, an annular airbag fixedly mounted on the top of the sample delivery tube, the annular airbag being located in the annular groove, the annular airbag being connected to a display element through a connecting tube, the display element displaying the pressure change of the inner cavity of the annular airbag through a pressure difference, and the sealing device being arranged on the lower end surface of the sample delivery tube; The inner cavity of the sample delivery tube is rotatably mounted with a heat-insulating ball, and the outer wall of the heat-insulating ball is symmetrically fixed with two rotating shafts. The heat-insulating ball is rotatably mounted in the sample delivery tube via the two rotating shafts. A connecting hole is provided on the heat-insulating ball, and the aperture of the connecting hole is the same as the inner diameter of the sample delivery tube; A transmission chamber is provided in the wall of the sample transport cylinder, and a transmission mechanism is fixedly installed in the inner cavity of the transmission chamber. The transmission mechanism includes an inner air bag, an air delivery pipe, a piston cylinder, a first piston, a first piston rod, a rack and a gear. The gear and the rack are both located in the transmission chamber. The gear is fixedly installed at the end of the rotating shaft away from the heat-insulating ball. The inner air bag is fixedly installed in the inner cavity of the annular air bag. The piston cylinder is fixedly installed in the wall of the sample transport cylinder. The top end of the piston cylinder is connected to the bottom end of the air delivery pipe. The piston cylinder is connected to the inner air bag through the air delivery pipe. The inner cavity of the piston cylinder is slidably installed with a first piston. The bottom end of the first piston is fixedly installed with a first piston rod. The bottom end of the first piston rod is fixedly installed with a rack, and the rack is meshingly connected with the gear. The transmission chamber passes through the sample transport cylinder, a second piston rod is fixedly mounted on the bottom end of the rack, a second piston is fixedly mounted on the bottom end of the second piston rod, and a second magnetic block is fixedly mounted on the bottom end of the second piston.

2. A high temperature sample introduction device for a gas chromatograph according to claim 1, characterized in that: The display element comprises a mounting seat, a transparent fixed tube and a colored droplet. The transparent fixed tube is fixedly mounted on the top of the mounting seat, a capillary is fixedly mounted in the inner cavity of the transparent fixed tube, a colored droplet is arranged in the inner cavity of the capillary, and the bottom end of the capillary is connected to the annular airbag through a connecting tube.

3. A high temperature sample introduction device for a gas chromatograph according to claim 2, characterized in that: The sealing plate covers the bottom of the through hole of the sample feeding tube, and the sealing plate is rotatably connected to the sample feeding tube.

4. A high temperature sample introduction device for a gas chromatograph according to claim 3, characterized in that: The first magnetic block cooperates with the transmission chamber.

5. A high temperature sample introduction device for a gas chromatograph according to claim 4, characterized in that: The sealing plate is made of heat-insulating material.

Images