Ultralow-temperature gas chromatography cold trap structure

Abstract

The utility model belongs to the field of cold trap equipment, and particularly relates to an ultralow-temperature gas chromatography cold trap structure which comprises a gas chromatograph, a cold trap groove is formed in the top of the gas chromatograph, valve bodies are detachably installed on the inner walls of the two sides of the cold trap groove respectively, valve mechanisms are arranged on the two valve bodies respectively, and the valve mechanisms are arranged on the two valve bodies respectively. The same cold trap pipe is arranged on the sides, close to each other, of the two valve bodies, a connecting mechanism is arranged between the valve body located on the left side and the cold trap pipe, and a feeder is arranged at the top of the gas chromatograph. According to the utility model, the inlet and outlet air quantity can be accurately controlled, so that the cooling effect in the cold trap equipment can be maximized, the final separation effect is improved, meanwhile, the inside of the cold trap equipment can be conveniently cleaned and the filter element can be conveniently replaced by the arranged dismounting mechanism, and the practicability of the equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of cold trap equipment technology, and in particular to an ultra-low temperature gas chromatography cold trap structure. Background Technology

[0002] The ultra-low temperature gas chromatography cold trap structure is a key component in a gas chromatography analysis system used for low-temperature collection and focusing of samples. It typically consists of a cooling element, a cold trap cavity, gas inlet and outlet, and insulation components. Based on the principle of cryogenic freezing, it utilizes the low-temperature environment to rapidly cool and condense the target analyte in the gas phase, transforming it from a gaseous state to a liquid or solid state, thereby achieving the collection of the target analyte and its separation from other gases. Ultra-low temperature conditions are generally achieved by using cryogenic media such as liquid nitrogen or dry ice, or by using specialized refrigeration equipment, so that the internal temperature of the cold trap can be low enough to cause the components in the sample to condense sequentially at different temperatures, achieving separation and enrichment.

[0003] When using a cold trap mechanism, as the usage time increases, the amount of impurities remaining inside will increase, thus affecting the final detection results. However, most current cold trap mechanisms are integrated and difficult to disassemble or open. Replacing the internal filter element also requires tools such as tweezers, which is quite inconvenient. Utility Model Content

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A cold trap structure for ultra-low temperature gas chromatography includes a gas chromatograph, the top of which has a cold trap groove. Valve bodies can be detachably installed on both inner walls of the cold trap groove, and each valve body is equipped with a valve mechanism. The same cold trap tube is provided on the side of the two valve bodies that are close to each other, and a connecting mechanism is provided between the valve body on the left side and the cold trap tube.

[0006] Specifically, the gas chromatograph is equipped with a feeder at the top, which facilitates the feeder to transport materials into the gas chromatograph.

[0007] Specifically, the connection mechanism includes a fixed threaded seat, a threaded ring, and a connecting threaded seat. The fixed threaded seat is fixedly sleeved on the outside of the cold trap tube, and a threaded ring is threaded on the fixed threaded seat. A connecting threaded seat is fixedly installed on one side of the valve body on the left side. The connecting threaded seat is adapted to the threaded ring, and the connecting threaded seat and the fixed threaded seat are connected by the threaded ring, which facilitates installation and disassembly.

[0008] Specifically, a sealing ring is fixedly installed on one side of the connecting threaded seat, and a sealing groove is provided on one side of the threaded ring. The sealing groove is adapted to the sealing ring to help prevent gas leakage.

[0009] Specifically, a filter element is detachably installed on one side of the connecting threaded seat, and a refrigeration pipe is provided inside the cold trap tube. The filter element is slidably installed inside the refrigeration pipe, which facilitates the replacement of the filter element.

[0010] Specifically, the gas chromatograph has a refrigeration tank at the top, which is connected to the cold trap tank. A micro-refrigerator is fixedly installed on the bottom inner wall of the refrigeration tank. The inlet and outlet of the micro-refrigerator are detachably connected to the two ends of the refrigeration tube, which facilitates the delivery of cooling gas and disassembly and assembly.

[0011] Specifically, the valve mechanism includes a valve sleeve, a drive assembly, a threaded rod, a valve core, a valve seat, two guide metal blocks, and a guide groove. The valve sleeve is fixedly installed through the valve body. A drive groove is provided on the inner side of the valve sleeve. A drive assembly is provided on the inner side of the drive groove. A threaded rod is provided at the bottom of the drive assembly. A valve core is fixedly installed at the bottom end of the threaded rod. Two guide metal blocks are fixedly installed on the outer side of the valve core. A valve seat is fixedly installed on the inner side of the valve body. A guide groove is provided on the top of the valve seat. The two guide metal blocks are slidably installed in the corresponding guide grooves. A valve needle hole is provided on the bottom inner wall of the guide groove. The valve core is adapted to the valve needle hole to facilitate valve closure.

[0012] Specifically, the drive assembly includes a servo motor and a threaded sleeve. The servo motor is fixedly installed on the bottom inner wall of the drive groove, and the threaded sleeve is fixedly sleeved on the output shaft of the servo motor. The threaded sleeve is rotatably installed on the inner side of the valve sleeve, and the threaded sleeve is threadedly connected to the threaded rod, so as to facilitate the movement of the threaded rod by driving the threaded sleeve.

[0013] Compared with the prior art, the advantages of this utility model are as follows: the valve mechanism can precisely control the amount of air entering and exiting, thereby maximizing the cooling effect inside the cold trap device and improving the final separation effect. At the same time, the disassembly mechanism can facilitate the cleaning of the inside of the cold trap device and the replacement of the filter element, increasing the practicality of the device. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of an ultra-low temperature gas chromatography cold trap structure proposed in this utility model;

[0015] Figure 2 This is a three-dimensional structural cross-sectional schematic diagram of a cold trap structure for ultra-low temperature gas chromatography proposed in this utility model.

[0016] Figure 3 This is a three-dimensional structural disassembly diagram of the cold trap mechanism of an ultra-low temperature gas chromatography cold trap structure proposed in this utility model.

[0017] Figure 4 This is a three-dimensional structural disassembly diagram of the connector of the ultra-low temperature gas chromatography cold trap structure proposed in this utility model;

[0018] Figure 5 This is a three-dimensional cross-sectional view of the valve mechanism of an ultra-low temperature gas chromatography cold trap structure proposed in this utility model.

[0019] Figure 6 This is a three-dimensional structural disassembly diagram of the valve mechanism of an ultra-low temperature gas chromatography cold trap structure proposed in this utility model.

[0020] In the diagram: 1. Gas chromatograph; 2. Feeder; 3. Cold trap tank; 4. Valve body; 5. Cold trap tube; 6. Fixed threaded seat; 7. Threaded ring; 8. Connecting threaded seat; 9. Sealing ring; 10. Filter element; 11. Refrigeration pipe; 12. Miniature refrigerator; 13. Valve sleeve; 14. Servo motor; 15. Threaded sleeve; 16. Threaded rod; 17. Valve core; 18. Valve seat; 19. Guide block; 20. Guide groove. Detailed Implementation

[0021] Reference Figure 1-6 A cold trap structure for ultra-low temperature gas chromatography includes a gas chromatograph 1, a cold trap trough 3 on the top of the gas chromatograph 1, valve bodies 4 that can be detachably installed on both inner walls of the cold trap trough 3, and valve mechanisms on both valve bodies 4; the same cold trap tube 5 is provided on the side of the two valve bodies 4 that are close to each other, and a connecting mechanism is provided between the valve body 4 on the left and the cold trap tube 5.

[0022] In this embodiment, a feeder 2 is provided on the top of the gas chromatograph 1, which facilitates the feeder 2 to transport materials into the gas chromatograph 1.

[0023] In this embodiment, the connecting mechanism includes a fixed threaded seat 6, a threaded ring 7, and a connecting threaded seat 8. The fixed threaded seat 6 is fixedly sleeved on the outside of the cold trap tube 5, and the threaded ring 7 is threadedly sleeved on the fixed threaded seat 6. The connecting threaded seat 8 is fixedly installed on one side of the valve body 4 on the left side. The connecting threaded seat 8 is adapted to the threaded ring 7, and the connecting threaded seat 8 and the fixed threaded seat 6 are connected by the threaded ring 7, which facilitates installation and disassembly.

[0024] In this embodiment, a sealing ring 9 is fixedly installed on one side of the connecting threaded seat 8, and a sealing groove is provided on one side of the threaded ring 7. The sealing groove is adapted to the sealing ring 9, which helps to prevent gas leakage.

[0025] In this embodiment, a filter element 10 is detachably installed on one side of the connecting threaded seat 8, and a cooling pipe 11 is provided inside the cold trap tube 5. The filter element 10 is slidably installed inside the cooling pipe 11, which facilitates the replacement of the filter element 10.

[0026] In this embodiment, a cooling tank is provided on the top of the gas chromatograph 1. The cooling tank is connected to the cold trap tank 3. A micro-cooler 12 is fixedly installed on the bottom inner wall of the cooling tank. The inlet and outlet of the micro-cooler 12 are detachably connected to the two ends of the cooling pipe 11, which facilitates the delivery of cooling gas and disassembly and assembly.

[0027] In this embodiment, the valve mechanism includes a valve sleeve 13, a drive assembly, a threaded rod 16, a valve core 17, a valve seat 18, two guide metal blocks 19, and a guide groove 20. The valve sleeve 13 is fixedly installed through the valve body 4. A drive groove is provided on the inner side of the valve sleeve 13. A drive assembly is provided on the inner side of the drive groove. A threaded rod 16 is provided at the bottom of the drive assembly. The valve core 17 is fixedly installed at the bottom end of the threaded rod 16. Two guide metal blocks 19 are fixedly installed on the outer side of the valve core 17. A valve seat 18 is fixedly installed on the inner side of the valve body 4. A guide groove 20 is provided on the top of the valve seat 18. The two guide metal blocks 19 are slidably installed in the corresponding guide grooves 20. A valve needle hole is provided on the bottom inner wall of the guide groove 20. The valve core 17 is adapted to the valve needle hole to facilitate valve closure.

[0028] In this embodiment, the drive assembly includes a servo motor 14 and a threaded sleeve 15. The servo motor 14 is fixedly installed on the bottom inner wall of the drive groove, and the threaded sleeve 15 is fixedly sleeved on the output shaft of the servo motor 14. The threaded sleeve 15 is rotatably installed on the inner side of the valve sleeve 13. The threaded sleeve 15 is threadedly connected to the threaded rod 16, which facilitates the movement of the threaded rod 16 by the threaded sleeve 15.

[0029] Working Principle: During operation, the operator starts the gas chromatograph via the control panel, and simultaneously, the feeder 2 adds material into the equipment. Then, the operator starts two servo motors 14 via the control panel, thus activating the cold trap. The two servo motors 14 drive the corresponding threaded sleeves 15 to rotate, which in turn drives the corresponding threaded rods 16 to rotate. However, valve cores 17 are fixedly installed at the bottom of each of the two threaded rods 16, and two guide metal blocks 19 are fixedly installed on the outer side of each valve core 17. These guide metal blocks 19 are slidably installed in the guide grooves of the corresponding valve seats 18. Therefore, the two threaded rods 16 cannot rotate. Consequently, the rotation of the two threaded sleeves 15 causes the corresponding threaded rods 16 to move, and the movement of the two threaded rods 16 causes the corresponding valve cores 17 to move upwards. At this point, the two valve cores 17... Because the gas is away from the corresponding valve seat 18, it can enter the cold trap tube 5 through the valve body 4. When the equipment is started, the micro-cooler 12 is also started. The micro-cooler 12 generates cooling gas that circulates through the cooling pipe 11, cooling and condensing the gas in the cold trap tube 5. The gas then passes through the filter element 10, which intercepts the condensed impurities. When the filter element 10 needs to be replaced after prolonged use, the operator stops the machine through the control panel. Then, the operator first separates the micro-cooler 12 and the cooling pipe 11. After disassembling the cold trap equipment, the operator manually rotates the threaded ring 7 counterclockwise. The threaded ring 7 moves to the right when rotated counterclockwise, moving away from the connecting threaded seat 8, thus completing the disassembly. The operator can then clean the cold trap tube 5 and disassemble and replace the filter element 10.

[0030] The technological advancements of this invention compared to existing technologies are: it can precisely control the volume of air entering and exiting, thereby maximizing the cooling effect inside the cold trap device and improving the final separation effect. At the same time, the disassembly mechanism allows for convenient cleaning of the inside of the cold trap device and replacement of the filter element 10, increasing the practicality of the device.

Claims

1. An ultra-low temperature gas chromatography cold trap structure, characterized by, Including gas chromatograph (1), the top of gas chromatograph (1) is provided with cold trap groove (3), the both sides of cold trap groove (3) are provided with valve body (4), and the both sides of two valve bodies (4) are provided with valve mechanism; The side of two valve bodies (4) is provided with the same cold trap pipe (5), and the left valve body (4) and the cold trap pipe (5) are provided with connecting mechanism.

2. An ultra-low temperature gas chromatography cold trap structure according to claim 1, wherein, The top of gas chromatograph (1) is provided with feeder (2).

3. An ultra-low temperature gas chromatography cold trap structure according to claim 1, wherein, The connecting mechanism includes fixed threaded seat (6), threaded ring (7) and connecting threaded seat (8), the outside of cold trap pipe (5) is fixedly provided with fixed threaded seat (6), the threaded ring (7) is threadedly provided on the fixed threaded seat (6), and the side of left valve body (4) is fixedly provided with connecting threaded seat (8), the connecting threaded seat (8) is matched with threaded ring (7), and the connecting threaded seat (8) and fixed threaded seat (6) are connected through threaded ring (7).

4. An ultra-low temperature gas chromatography cold trap structure according to claim 3, wherein, The side of connecting threaded seat (8) is fixedly provided with sealing rubber ring (9), one side of threaded ring (7) is provided with sealing groove, and the sealing groove is matched with sealing rubber ring (9).

5. An ultra-low temperature gas chromatography cold trap structure according to claim 4, wherein, The side of connecting threaded seat (8) is detachably provided with filter element (10), the inside of cold trap pipe (5) is provided with refrigeration pipe (11), and the filter element (10) is slidingly installed on the inside of refrigeration pipe (11).

6. An ultra-low temperature gas chromatography cold trap structure according to claim 5, wherein, The top of gas chromatograph (1) is provided with refrigeration groove, the refrigeration groove is communicated with cold trap groove (3), the bottom inner wall of refrigeration groove is fixedly provided with micro-refrigerator (12), and the inlet and outlet of micro-refrigerator (12) are detachably connected with the two ends of refrigeration pipe (11).

7. An ultra-low temperature gas chromatography cold trap structure according to claim 1, wherein, The valve mechanism includes valve sleeve (13), driving assembly, threaded rod (16), valve core (17), valve seat (18), two guide metal blocks (19) and guide groove (20), the valve sleeve (13) is fixedly penetrated through valve body (4), the inside of valve sleeve (13) is provided with driving groove, the inside of driving groove is provided with driving assembly, the bottom of driving assembly is provided with threaded rod (16), the bottom end of threaded rod (16) is fixedly provided with valve core (17), the outside of valve core (17) is fixedly provided with two guide metal blocks (19), the inside of valve body (4) is fixedly provided with valve seat (18), the top of valve seat (18) is provided with guide groove (20), two guide metal blocks (19) are slidingly installed in corresponding guide grooves (20), the bottom inner wall of guide groove (20) is provided with valve needle hole, and the valve core (17) is matched with valve needle hole.

8. An ultra-low temperature gas chromatography cold trap structure according to claim 7, wherein, The driving assembly includes servo motor (14) and threaded sleeve (15), the bottom inner wall of driving groove is fixedly provided with servo motor (14), the output shaft of servo motor (14) is fixedly provided with threaded sleeve (15), the threaded sleeve (15) is rotatably installed on the inside of valve sleeve (13), and the threaded sleeve (15) is threadedly connected with threaded rod (16).

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