Integrated liquid nitrogen purifier

Abstract

This invention relates to the field of liquid nitrogen purification and discloses an integrated liquid nitrogen purification device, including a PSA nitrogen generator truck. The PSA nitrogen generator truck is equipped with a filter tank, and a first adsorption tower and a second adsorption tower are connected to the filter tank. A quick-release device is fixedly installed on the top of the first and second adsorption towers. This invention allows observation of the internal pressure changes of the first adsorption tower via a pressure gauge inside the quick-release device. The top protrusion is sealed and disassembled using limiting and sealing components, facilitating pressure relief and disassembly of the first adsorption tower. This prevents liquefied gas inside the carbon molecular sieve from increasing the internal pressure of the first adsorption tower, which could cause the cover plate to be blown off by pressure during disassembly. The state of the limiting component is adjusted via a connecting component to achieve the sealing and disassembly functions of the sealing component.

Description

Technical Field

[0001] This invention relates to the field of liquid nitrogen purification devices, and more specifically, to an integrated liquid nitrogen purification device. Background Technology

[0002] Integrated liquid nitrogen purification units are compact devices that combine liquid nitrogen evaporation, impurity adsorption, and cold energy recovery into a single unit. Utilizing the low-temperature properties released during the vaporization of liquid nitrogen, they simultaneously remove moisture, oil mist, and particulate matter from the airflow, directly outputting high-purity nitrogen. This seamless design simplifies traditional purification processes and is particularly suitable for applications requiring high nitrogen quality but with limited space. Expanding our thinking further, we encounter the more mainstream PSA nitrogen generator—the Pressure Swing Adsorption (PSA) nitrogen generator. While also using air as a feedstock, it does not rely on an external liquid nitrogen supply. Instead, it uses carbon molecular sieves to selectively adsorb oxygen under pressure and desorb and regenerate under normal pressure, achieving continuous separation of nitrogen and oxygen. From liquid nitrogen purification to on-site PSA nitrogen generation, although the pathways differ, both are driving a shift towards more flexible and economical nitrogen utilization methods.

[0003] The adsorption tower of a PSA nitrogen generator contains a molecular sieve. During nitrogen production, air is filtered through the molecular sieve inside the adsorption tower. However, as the molecular sieve is used for a long time, its ability to adsorb oxygen and other impurities gradually decreases, requiring replacement. The adsorption tower is mainly sealed with bolts, making replacement cumbersome. Furthermore, even after depressurization, liquid may remain inside the molecular sieve. This liquid can turn into gas after further depressurization, increasing the pressure. If the adsorption tower is opened, the internal pressure can push open the top cover, potentially causing injury to workers. Summary of the Invention

[0004] This invention provides an integrated liquid nitrogen purification device, which solves the technical problem in related technologies where subsequent replacement is required. The internal seal of the adsorption tower is mainly tightened with bolts, which is quite troublesome during replacement. Furthermore, when depressurizing the adsorption tower, even after depressurization is completed, the liquid inside the molecular sieve may still turn into gas after subsequent depressurization, causing the gas pressure to increase. When the adsorption tower is opened, the internal gas pressure pushes up the top cover, causing injury to the staff.

[0005] This invention provides an integrated liquid nitrogen purification device, including a PSA nitrogen generator vehicle. The PSA nitrogen generator vehicle is equipped with a filter tank, and a first adsorption tower and a second adsorption tower are connected to the filter tank. A quick-release device is fixedly installed on the top of the first and second adsorption towers. Carbon molecular sieves that adsorb oxygen molecules and other gas molecules are disposed inside the first and second adsorption towers. The quick-release device is used to depressurize the first and second adsorption towers. The quick-release device includes a pressure gauge, a pressure relief component, a connector, an adjusting component, a limiting component, a sealing component, and a squeezing component. A top protrusion is provided on the top of the first adsorption tower. A pressure gauge and a pressure relief component are disposed on the upper part of the top protrusion. A connector is fixedly installed on the bottom of the pressure gauge. A sealing component is disposed on the outside of the connector. Limiting components are symmetrically disposed on the bottom of the top protrusion. A squeezing component is disposed on the bottom of the sealing component. An adjusting component is disposed on the top of the top protrusion.

[0006] As a further optimization of the present invention, the sealing element includes a second fixing block fixedly installed on the bottom of the top protrusion and symmetrically arranged, a sealing protrusion being rotatably installed at the end of the second fixing block, and a sealing plate being fixedly installed on the side of the sealing protrusion.

[0007] As a further optimization of the present invention, the connector includes a first connecting column fixedly installed on the top of the sealing plate, a valve channel is provided inside the first connecting column, a pressure gauge is connected to the top of the valve channel, and a compression rotating column is movably installed inside the first connecting column.

[0008] As a further optimization of the present invention, the pressure relief component includes a pressure relief valve handle fixedly installed at the lower part of the pressure gauge, and the pressure relief valve handle is provided with a squeezing protrusion, which rotates to squeeze the squeezing rotating column.

[0009] As a further optimization of the present invention, the limiting member includes a first fixing block fixedly installed symmetrically arranged at the bottom of the top protrusion, a limiting protrusion rotatably installed at the end of the first fixing block, a limiting semicircular block fixedly installed on the side of the limiting protrusion, and a limiting groove provided inside the limiting semicircular block.

[0010] As a further optimization of the present invention, the adjusting component includes a gear ring rotatably mounted on the top of a top protrusion, a first gear symmetrically arranged rotatably mounted on the top of the top protrusion, a gear column fixedly mounted on the bottom of the first gear, a slide rail fixedly mounted on the upper inner wall of the first adsorption tower, a slider slidably mounted on the outside of the slide rail, the slider being threadedly mounted to the gear column, a first adjusting block rotatably mounted on the slider, a pull rod fixedly mounted on the outside of the first adjusting block, a second adjusting block fixedly mounted on the end of the pull rod, a T-shaped block rotatably mounted on the outside of the second adjusting block, and the T-shaped block being fixedly mounted on the bottom of the limiting semicircular block.

[0011] As a further optimization of the present invention, the extrusion member includes a third gear fixedly installed at the bottom of the extrusion rotating column, a fourth gear rotatably installed at the bottom center of the first connecting column, a rotating block fixedly installed at the bottom of the fourth gear, extrusion connecting columns rotatably installed at both ends of the rotating block, a first sliding plate rotatably installed at the end of the extrusion connecting column, an extrusion block fixedly installed at the bottom of the sealing plate, and the first sliding plate sliding inside the extrusion block.

[0012] As a further optimization of the present invention, the interior of the extrusion rotating column is provided with a coaxial telescopic rotating spiral mechanism, which causes the extrusion rotating column to descend and drive the third gear to rotate.

[0013] As a further optimization of the present invention, the first sliding plate and the limiting groove are at the same height, so that the first sliding plate slides inside the limiting groove.

[0014] As a further optimization of the present invention, the two first gears mesh with the gear ring.

[0015] The beneficial effects of this invention are as follows: The integrated liquid nitrogen purification device of this invention allows for observation of pressure changes inside the first adsorption tower via a pressure gauge inside the quick-release device. The top protrusion is sealed and disassembled using limiting and sealing components, facilitating pressure relief and disassembly of the first adsorption tower. This prevents liquefied gas inside the carbon molecular sieve from increasing the internal pressure of the first adsorption tower, thus avoiding the problem of the cover being blown off by pressure during disassembly. The state of the limiting component is adjusted via a connecting component to achieve the sealing and disassembly functions of the sealing component. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall shape of the device of the present invention; Figure 2 This is a schematic diagram of the overall device installation of the present invention; Figure 3 This is a schematic diagram of the quick-release device of the present invention. Figure 4 This is a schematic diagram of the quick-release device connection of the present invention; Figure 5 This is a schematic diagram of the internal structure of the quick-release device of the present invention; Figure 6 This is a schematic diagram of the transmission structure of the quick-release device of the present invention; Figure 7 This is a schematic diagram of the internal structure of the limiting member and the sealing member of the present invention; Figure 8 This is a schematic diagram of the internal structure of the extrusion part of the present invention; Figure 9 This is a schematic diagram of the internal structure of the adjusting component of the present invention; Figure 10 A schematic diagram of the internal structure of the connector of the present invention.

[0017] In the picture: 1. PSA nitrogen generator truck; 11. Filter canister; 12. First adsorption tower; 121. Top protrusion; 13. Second adsorption tower; 2. Quick-release device; 21. Pressure gauge; 22. Pressure relief component; 221. Pressure relief valve handle; 222. Extrusion protrusion; 23. Connecting component; 231. First connecting column; 232. Valve passage; 233. Extrusion rotating column; 24. Adjusting component; 241. Gear ring; 242. First gear; 243. Gear column; 244. Slide rail; 245. Slider; 246. First adjusting block; 247. Pull rod; 248. Second adjusting block 249. Block; 25. T-shaped block; 25. Limiting component; 251. First fixing block; 252. Limiting protrusion; 253. Limiting semicircular block; 254. Limiting groove; 26. Sealing component; 261. Second fixing block; 262. Sealing protrusion; 263. Sealing plate; 27. Extrusion component; 271. Third gear; 272. Fourth gear; 273. Rotating block; 274. Extrusion connecting column; 275. First sliding plate; 276. Extrusion block. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] like Figures 1 to 3As shown in the figure, an integrated liquid nitrogen purification device according to an embodiment of the present invention includes a PSA nitrogen generating vehicle 1. The PSA nitrogen generating vehicle 1 is equipped with a filter tank 11. A first adsorption tower 12 and a second adsorption tower 13 are connected to the filter tank 11. A quick-release device 2 is fixedly installed on the top of the first adsorption tower 12 and the second adsorption tower 13. The interior of the first adsorption tower 12 and the second adsorption tower 13 is provided with a carbon molecular sieve that can adsorb oxygen and other impurities. The quick-release device 2 is used to depressurize the first adsorption tower 12 and the second adsorption tower 13. like Figures 4 to 7 As shown, the quick-release device 2 includes a pressure gauge 21, a pressure relief component 22, a connector 23, an adjusting component 24, a limiting component 25, a sealing component 26, and a squeezing component 27. The top of the first adsorption tower 12 is provided with a top protrusion 121. The pressure gauge 21 and the pressure relief component 22 are provided on the upper part of the top protrusion 121. The connector 23 is fixedly installed at the bottom of the pressure gauge 21. The sealing component 26 is provided on the outside of the connector 23. The limiting component 25 is symmetrically provided at the bottom of the top protrusion 121. The squeezing component 27 is provided at the bottom of the sealing component 26. The adjusting component 24 is provided at the top of the top protrusion 121.

[0020] It should be noted that when the first adsorption tower 12 and the second adsorption tower 13 filter nitrogen, the carbon molecular sieve filters gases other than nitrogen by continuously changing the gas pressure inside the first adsorption tower 12 and the second adsorption tower 13. However, with prolonged use, the performance of the carbon molecular sieve deteriorates, requiring replacement. During replacement, the gas pressure inside the first adsorption tower 12 and the second adsorption tower 13 needs to be released. After the release, residual gas may remain inside the carbon molecular sieve. After depressurization, the vaporized gas from the carbon molecular sieve will generate pressure again, resulting in a relatively high gas pressure inside the first adsorption tower 12 and the second adsorption tower 13. If only the first... Removing the top covers of adsorption towers 12 and 13 could potentially cause internal pressure to push the covers up, potentially injuring workers. To address this, quick-release devices 2 are installed at the top of the first and second adsorption towers 12 and 13. A pressure gauge 21 monitors the internal pressure of the first and second adsorption towers 12 and 13. Adjusting the pressure relief component 22 releases the locking mechanism 27 from the limiting component 25. Then, a motor drives the adjusting component 24 to rotate, thus adjusting the limiting component 25 and releasing it from the locking mechanism 26. When there is no internal pressure in the first adsorption tower 12, the sealing component 26 automatically releases itself under gravity. Rotating the adjustment component 24 opens the seal 26, facilitating the replacement of the carbon molecular sieve inside the first adsorption tower 12. Once replacement is complete, rotating the adjustment component 24 again will bring the seal 26 into contact with the bottom of the top protrusion 121 on the top of the first adsorption tower 12 until the seal 26 is fully in contact with the bottom of the top protrusion 121, sealing the top. Then, rotating the pressure relief component 22 closes the valve below the pressure gauge 21, allowing the squeezing component 27 to limit the position of the limiting component 25, thus completing the replacement of the carbon molecular sieve and the sealing process. The pressure relief component 22 and the limiting component 25 are interlocked; opening the valve releases the interlock. Finally, adjusting the adjustment component 24 opens the seal 26, preventing the seal from becoming too tight. When the seal 26 fails to seal the top of the first adsorption tower 12, the pressure relief component 22 closes. This prevents the seal 26 from being positioned above the top protrusion 121, which could lead to incomplete pressure relief inside the first adsorption tower 12 and potential injury to personnel. This device uses a pressure gauge 21 inside the quick-release device 2 to observe changes in the internal pressure of the first adsorption tower 12. The top protrusion 121 is sealed and disassembled using the limiting component 25 and the seal 26, facilitating pressure relief and disassembly of the first adsorption tower 12. This prevents liquefied gas inside the carbon molecular sieve from increasing the internal pressure of the first adsorption tower 12, which could cause the cover to be blown off by pressure during disassembly. The state of the limiting component 25 is adjusted via the connecting component 23.This enables the sealing and disassembly of seal 26.

[0021] like Figures 5 to 7 As shown, the sealing element 26 includes a second fixing block 261 that is fixedly installed on the bottom of the top protrusion 121 and symmetrically arranged. A sealing protrusion 262 is rotatably installed on the end of the second fixing block 261, and a sealing plate 263 is fixedly installed on the side of the sealing protrusion 262.

[0022] It should be noted that the sealing element 26 includes a second fixing block 261 symmetrically arranged at the bottom of the top protrusion 121. A sealing protrusion 262 is rotatably mounted on the end of the second fixing block 261, and a sealing plate 263 is fixedly mounted on the side of the sealing protrusion 262. The second fixing block 261 is rotatably connected to the sealing protrusion 262, and the sealing plate 263 is located at the lower part of the top protrusion 121. Therefore, even if there is air pressure inside the first adsorption tower 12 during disassembly, the sealing plate 263 will not be blown away by the staff during disassembly, thus preventing injury to the staff.

[0023] like Figures 8 to 10 As shown, the connector 23 includes a first connecting post 231 fixedly installed on the top of the sealing plate 263. A valve channel 232 is provided inside the first connecting post 231. A pressure gauge 21 is connected to the top of the valve channel 232. A compression rotating post 233 is movably installed inside the first connecting post 231.

[0024] It should be noted that the connector 23 includes a first connecting post 231 fixedly installed on the top of the sealing plate 263. The first connecting post 231 has a valve channel 232 inside. A pressure gauge 21 is connected to the top of the valve channel 232. A compression rotating post 233 is movably installed inside the first connecting post 231. When the compression rotating post 233 is compressed, it can drive the third gear 271 to rotate. The pressure gauge 21 is installed on the top of the valve channel 232. A valve is installed inside the pressure gauge 21. The lower valve of the pressure gauge 21 can be adjusted through the pressure relief component 22, thereby achieving the purpose of sealing and pressure relief.

[0025] like Figure 10 As shown, the pressure relief component 22 includes a pressure relief valve handle 221 fixedly installed at the lower part of the pressure gauge 21. The pressure relief valve handle 221 is provided with a squeezing protrusion 222, which rotates to squeeze the squeezing rotating column 233.

[0026] It should be noted that the pressure relief component 22 includes a pressure relief valve handle 221 fixedly installed at the lower part of the pressure gauge 21. The pressure relief valve handle 221 is provided with a squeezing protrusion 222. The squeezing protrusion 222 rotates to squeeze the squeezing rotating column 233. When the pressure relief valve handle 221 is rotated, the squeezing protrusion 222 rotates, which can squeeze the squeezing rotating column 233, thereby realizing the locking effect of the squeezing component 27 on the limiting component 25.

[0027] like Figures 7 to 8 As shown, the limiting member 25 includes a first fixing block 251 symmetrically arranged at the bottom of the top protrusion 121, a limiting protrusion 252 is rotatably installed at the end of the first fixing block 251, a limiting semicircular block 253 is fixedly installed on the side of the limiting protrusion 252, and a limiting groove 254 is provided inside the limiting semicircular block 253.

[0028] It should be noted that the side of the limiting semicircular block 253 is connected to the adjusting member 24, so the adjusting member 24 can adjust the rotation angle of the limiting semicircular block 253. The limiting groove 254 engages with the extrusion member 27, which can interlock the two limiting semicircular blocks 253, thereby enabling the sealing member 26 to seal the top of the first adsorption tower 12.

[0029] like Figure 9 As shown, the adjusting component 24 includes a gear ring 241 rotatably mounted on the top of the top protrusion 121, a first gear 242 symmetrically arranged rotatably mounted on the top of the top protrusion 121, a gear column 243 fixedly mounted on the bottom of the first gear 242, a slide rail 244 fixedly mounted on the upper inner wall of the first adsorption tower 12, a slider 245 slidably mounted on the outside of the slide rail 244, the slider 245 being threadedly mounted to the gear column 243, a first adjusting block 246 rotatably mounted on the slider 245, a pull rod 247 fixedly mounted on the outside of the first adjusting block 246, a second adjusting block 248 fixedly mounted on the end of the pull rod 247, a T-shaped block 249 rotatably mounted on the outside of the second adjusting block 248, and the T-shaped block 249 fixedly mounted on the bottom of the limiting semicircular block 253.

[0030] It should be noted that the rotation of the gear ring 241 can drive the first gear 242 and the gear column 243 to rotate, and the rotation of the gear column 243 can drive the slider 245 to rise and fall. The rise and fall of the slider 245 is used to adjust the position of the T-block 249, thereby driving the limiting semicircular block 253 to rotate around the end of the first fixed block 251, relieving the squeezing effect on the sealing plate 263, and realizing the function of adjusting the sealing and pressure relief of the sealing plate 263.

[0031] like Figures 8 to 10As shown, the extrusion member 27 includes a third gear 271 fixedly installed at the bottom of the extrusion rotating column 233, a fourth gear 272 rotatably installed at the bottom center of the first connecting column 231, a rotating block 273 fixedly installed at the bottom of the fourth gear 272, extrusion connecting columns 274 rotatably installed at both ends of the rotating block 273, a first sliding plate 275 rotatably installed at the end of the extrusion connecting column 274, and an extrusion block 276 fixedly installed at the bottom of the sealing plate 263. The first sliding plate 275 slides inside the extrusion block 276.

[0032] It should be noted that the downward movement of the extrusion rotating column 233 drives the third gear 271 to rotate, which in turn drives the fourth gear 272 and the rotating block 273 to rotate. The rotation of the rotating block 273 causes the extrusion connecting column 274 and the first slide plate 275 to move closer to the center of the fourth gear 272, thereby releasing the locking effect of the first slide plate 275 on the limiting semicircular block 253.

[0033] like Figure 10 As shown, the extrusion rotating column 233 is provided with a coaxial telescopic rotating spiral mechanism inside, which causes the extrusion rotating column 233 to descend and drive the third gear 271 to rotate.

[0034] It should be noted that the extrusion rotating column 233 is equipped with a coaxial telescopic rotating spiral mechanism, which causes the extrusion rotating column 233 to descend and drive the third gear 271 to rotate. Thus, when the extrusion protrusion 222 pushes up the extrusion rotating column 233, it can drive the third gear 271 to rotate.

[0035] like Figures 8 to 9 As shown, the first sliding plate 275 and the limiting groove 254 are at the same height, so that the first sliding plate 275 slides inside the limiting groove 254.

[0036] It should be noted that the first sliding plate 275 is at the same height as the limiting groove 254, so that the first sliding plate 275 slides inside the limiting groove 254, and the first sliding plate 275 extends out and slides inside the limiting groove 254 to limit the limiting semicircular block 253.

[0037] like Figures 6 to 9 As shown, the two first gears 242 mesh with the gear ring 241.

[0038] It should be noted that the two first gears 242 mesh with the gear ring 241, so that the rotation of the gear ring 241 can drive the two limiting semicircular blocks 253 to release the locking effect on the sealing plate 263.

[0039] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the embodiments described above, all of which are within the protection scope of the present invention.

Claims

1. An integrated liquid nitrogen purification device, comprising a PSA nitrogen generator (1), characterized in that: The PSA nitrogen generator (1) is equipped with a filter barrel (11), and a first adsorption tower (12) and a second adsorption tower (13) are connected to the filter barrel (11). A quick-release device (2) is fixedly installed on the top of the first adsorption tower (12) and the second adsorption tower (13). The interior of the first adsorption tower (12) and the second adsorption tower (13) is equipped with a carbon molecular sieve that adsorbs oxygen molecules and other gas molecules. The quick-release device (2) is used to depressurize the first adsorption tower (12) and the second adsorption tower (13). The quick-release device (2) includes a pressure gauge (21), a pressure relief component (22), a connector (23), an adjusting component (24), a limiting component (25), a sealing component (26), and a squeezing component (27). The top of the first adsorption tower (12) is provided with a top protrusion (121). The pressure gauge (21) and the pressure relief component (22) are provided on the upper part of the top protrusion (121). The connector (23) is fixedly installed at the bottom of the pressure gauge (21). The sealing component (26) is provided on the outside of the connector (23). The limiting component (25) is symmetrically provided at the bottom of the top protrusion (121). The squeezing component (27) is provided at the bottom of the sealing component (26). The adjusting component (24) is provided at the top of the top protrusion (121).

2. The integrated liquid nitrogen purification device according to claim 1, characterized in that: The sealing element (26) includes a second fixing block (261) fixedly installed on the bottom of the top protrusion (121) and symmetrically arranged. A sealing protrusion (262) is rotatably installed at the end of the second fixing block (261), and a sealing plate (263) is fixedly installed on the side of the sealing protrusion (262).

3. The integrated liquid nitrogen purification device according to claim 2, characterized in that: The connector (23) includes a first connecting post (231) fixedly installed on the top of the sealing plate (263). A valve channel (232) is provided inside the first connecting post (231). A pressure gauge (21) is connected to the top of the valve channel (232). A compression rotating post (233) is movably installed inside the first connecting post (231).

4. The integrated liquid nitrogen purification device according to claim 3, characterized in that: The pressure relief component (22) includes a pressure relief valve handle (221) fixedly installed at the lower part of the pressure gauge (21). The pressure relief valve handle (221) is provided with a squeezing protrusion (222), which rotates to squeeze the squeezing rotating column (233).

5. The integrated liquid nitrogen purification device according to claim 4, characterized in that: The limiting member (25) includes a first fixing block (251) fixedly installed on the bottom of the top protrusion (121) and symmetrically arranged. A limiting protrusion (252) is rotatably installed at the end of the first fixing block (251). A limiting semicircular block (253) is fixedly installed on the side of the limiting protrusion (252). A limiting groove (254) is provided inside the limiting semicircular block (253).

6. The integrated liquid nitrogen purification device according to claim 5, characterized in that: The adjusting component (24) includes a gear ring (241) rotatably mounted on the top of a top protrusion (121), a first gear (242) symmetrically arranged rotatably mounted on the top of the top protrusion (121), a gear column (243) fixedly mounted on the bottom of the first gear (242), a slide rail (244) fixedly mounted on the upper inner wall of the first adsorption tower (12), a slider (245) slidably mounted on the outside of the slide rail (244), the slider (245) being threadedly mounted to the gear column (243), a first adjusting block (246) rotatably mounted on the slider (245), a pull rod (247) fixedly mounted on the outside of the first adjusting block (246), a second adjusting block (248) fixedly mounted on the end of the pull rod (247), a T-shaped block (249) rotatably mounted on the outside of the second adjusting block (248), and the T-shaped block (249) fixedly mounted on the bottom of the limiting semicircular block (253).

7. The integrated liquid nitrogen purification device according to claim 6, characterized in that: The extrusion component (27) includes a third gear (271) fixedly installed at the bottom of the extrusion rotating column (233), a fourth gear (272) rotatably installed at the bottom center of the first connecting column (231), a rotating block (273) fixedly installed at the bottom of the fourth gear (272), extrusion connecting columns (274) rotatably installed at both ends of the rotating block (273), a first sliding plate (275) rotatably installed at the end of the extrusion connecting column (274), and an extrusion block (276) fixedly installed at the bottom of the sealing plate (263). The first sliding plate (275) slides inside the extrusion block (276).

8. The integrated liquid nitrogen purification device according to claim 7, characterized in that: The extrusion rotating column (233) is equipped with a coaxial telescopic rotating spiral mechanism inside, which causes the extrusion rotating column (233) to descend and drive the third gear (271) to rotate.

9. An integrated liquid nitrogen purification device according to claim 8, characterized in that: The first sliding plate (275) is at the same height as the limiting groove (254), so that the first sliding plate (275) slides inside the limiting groove (254).

10. An integrated liquid nitrogen purification device according to claim 9, characterized in that: The two first gears (242) mesh with the gear ring (241).

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