A purification apparatus
By designing a purification device with an external heat exchanger and a built-in filter for liquid nitrogen Dewar in a helium refrigeration system, the problems of severe heat leakage and cold loss were solved, achieving reduced energy consumption and efficient purification of the purification medium.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 中科富海(中山)低温装备制造有限公司
- Filing Date
- 2023-09-07
- Publication Date
- 2026-06-12
AI Technical Summary
The existing purification equipment suffers from severe heat leakage in the helium refrigeration system, resulting in significant loss of cooling capacity and high energy consumption.
The design incorporates a heat exchanger and filter within the liquid nitrogen Dewar. The heat exchanger is located on the outside of the liquid nitrogen Dewar, forming a cold shield to reduce heat transfer between the liquid nitrogen Dewar and the outside environment. The filter contains an adsorption medium and a filtration assembly, which are used to remove impurity gases and particulate matter, respectively.
It significantly reduces the cold loss of liquid nitrogen Dewar, reduces energy consumption, and improves purification efficiency and the cleanliness of the purification medium.
Smart Images
Figure CN117053500B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of helium purification technology, and more particularly to a purification device. Background Technology
[0002] In the field of cryogenics, cooling is typically achieved using liquid helium, which is obtained by cooling helium gas using a helium cryostat system. The operation of this system requires extremely high purity helium, with impurity gas content required to be less than or equal to 5 ppm. During on-site installation, dust may be introduced into the skid-mounted piping, and welding slag and other impurities may be introduced during pipe welding. Therefore, the entire system needs to be purified to remove impurities before normal operation, typically using a purification device.
[0003] However, existing purification devices suffer from severe heat leakage and significant loss of cooling capacity during operation, resulting in high energy consumption. Summary of the Invention
[0004] This application provides a purification apparatus to reduce heat leakage during the purification of helium.
[0005] This application provides a purification apparatus, comprising:
[0006] shell;
[0007] A liquid nitrogen Dewar is disposed within the outer casing;
[0008] A heat exchanger is disposed between the liquid nitrogen Dewar and the outer shell, and the heat exchanger includes a first heat exchange channel and a second heat exchange channel;
[0009] A filter is installed inside the liquid nitrogen Dewar. The inlet of the filter is connected to the output end of the first heat exchange channel, and the output end of the filter is connected to the inlet of the second heat exchange channel.
[0010] Based on the above technical solutions, during use, the heat exchanger can form a cold shield structure on the outside of the liquid nitrogen Dewar, which can change the heat transfer path between the liquid nitrogen Dewar and the external environment, reduce the heat exchange between the liquid nitrogen Dewar and the external environment, and significantly reduce the cold loss of the liquid nitrogen Dewar, thereby reducing the loss of cold energy in the purification equipment and reducing energy consumption.
[0011] In some possible implementations, the heat exchanger is a spiral structure formed by winding heat exchange tubes, and the heat exchanger includes a first end and a second end, wherein the diameter of the first end is larger than the diameter of the second end.
[0012] The input end of the first heat exchange channel is located close to the first end, and the output end of the first heat exchange channel is located close to the second end;
[0013] The input end of the second heat exchange channel is located close to the second end, and the output end of the second heat exchange channel is located close to the first end;
[0014] The purification equipment includes a heat-insulating medium that fills the space between the outer shell and the heat exchanger, and between the heat exchanger and the liquid nitrogen Dewar.
[0015] In some possible implementations, the liquid nitrogen Dewar includes a main tank and at least one connecting pipe, and the outer shell includes an outer shell body and at least one set of pipes;
[0016] The main tank is disposed within the outer shell body. One end of the at least one connecting pipe is connected to the interior of the main tank. The end of the at least one connecting pipe away from the main tank passes through the outer shell body and protrudes relative to the outer shell body. There is a gap between the connecting pipe and the outer shell body.
[0017] The at least one sleeve is disposed on the side of the outer shell body away from the main tank portion. The at least one sleeve is fitted around the periphery of the at least one connecting pipe in a corresponding and spaced manner. A connecting ring is also provided at the end of the sleeve away from the outer shell body. The connecting ring is connected between the sleeve and the corresponding connecting pipe.
[0018] In some possible implementations, the filter includes:
[0019] The housing assembly has both the inlet and outlet of the filter located at the same end.
[0020] An adsorption medium is filled in the housing assembly, and the adsorption medium is used to filter impurity gases in the purification medium.
[0021] The filter assembly is provided at both the inlet and the outlet, and is used to filter particulate impurities in the purification medium.
[0022] In some possible implementations, the filter assembly includes a first porous plate, a filter sheet, and a second porous plate stacked sequentially.
[0023] In some possible implementations, the filter further includes a flow guide disposed in the housing assembly, one end of the flow guide communicating with the inlet and the other end of the flow guide extending away from the inlet.
[0024] In some possible implementations, the filter further includes an assembly tube inserted into the housing assembly, the assembly tube having a closed end and an open end, the closed end being located within the housing assembly, and the open end protruding relative to the end of the housing assembly furthest from the inlet, the assembly tube being used to insert an electric heating rod.
[0025] In some possible implementations, the liquid nitrogen Dewar includes a main tank and a first connecting pipe;
[0026] One end of the first connecting pipe is connected to the interior of the main tank and is connected to the open end of the assembly pipe.
[0027] The end of the first connecting pipe away from the main tank is inserted through the outer shell and protrudes relative to the outer shell.
[0028] In some possible implementations, the housing assembly includes a housing body, a first end cap, and a second end cap, the first end cap and the second end cap being disposed at opposite ends of the housing body;
[0029] The input port and the output port are located on the first end cover, and the second end cover is detachably connected to the shell body.
[0030] In some possible implementations, the purification device further includes a purification medium inlet tube and a purification medium outlet tube;
[0031] One end of the purification medium input pipe is connected to the input end of the first heat exchange channel, and the other end of the purification medium input pipe is connected to a first self-sealing joint.
[0032] One end of the purification medium output tube is connected to the output end of the second heat exchange channel, and the other end of the purification medium output tube is connected to a second self-sealing connector. Attached Figure Description
[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0034] Figure 1 Schematic diagrams of the purification equipment in some embodiments are shown;
[0035] Figure 2 A cross-sectional structural schematic diagram of the purification device is shown in some embodiments;
[0036] Figure 3Schematic diagrams of the internal piping of the purification equipment in some embodiments are shown;
[0037] Figure 4 Another schematic diagram of the internal piping of the purification device is shown in some embodiments;
[0038] Figure 5 Partial structural schematic diagrams of the heat exchanger in some embodiments are shown;
[0039] Figure 6 A cross-sectional structural diagram of the liquid nitrogen Dewar and filter is shown in some embodiments;
[0040] Figure 7 A cross-sectional structural schematic diagram of the filter in some embodiments is shown;
[0041] Figure 8 A cross-sectional structural schematic diagram of the filter component in some embodiments is shown.
[0042] Explanation of key component symbols:
[0043] 1000 - Purification equipment;
[0044] 100 - Outer shell; 110 - Outer shell body; 120 - Sleeve; 130 - Explosion-proof plate; 140 - Connecting ring;
[0045] 200 - Liquid nitrogen Dewar; 210 - Main tank section; 220 - Connecting pipe; 221 - First connecting pipe; 222 - Second connecting pipe; 223 - Third connecting pipe;
[0046] 300 - Heat exchanger; 301 - First end; 302 - Second end; 310 - First heat exchange channel; 320 - Second heat exchange channel; 330 - Inner tube; 340 - Outer tube;
[0047] 400 - Filter; 410 - Housing assembly; 411 - Housing body; 412 - First end cap; 4121 - Inlet; 4122 - Outlet; 413 - Second end cap; 420 - Filter assembly; 421 - Mounting base; 422 - First perforated plate; 423 - Filter disc; 424 - Second perforated plate; 430 - Guide tube; 440 - Assembly tube;
[0048] 510 - Purification medium inlet pipe; 511 - First self-sealing connector; 512 - Drain valve; 520 - Purification medium outlet pipe; 521 - Second self-sealing connector; 522 - Purge valve; 523 - Second pressure relief valve; 530 - First transmission pipe; 531 - First pressure gauge; 532 - Drain valve; 533 - First pressure relief valve; 540 - Second transmission pipe; 541 - Second pressure gauge; 542 - Vacuum valve; 551 - First pipeline; 552 - Second pipeline; 553 - Third pipeline; 554 - Fourth pipeline;
[0049] 600-Standard;
[0050] 700-caster;
[0051] 800-Float Level Gauge. Detailed Implementation
[0052] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0053] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0055] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0056] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0057] like Figure 1 As shown in the embodiment, a purification device 1000 is provided, which can be used to purify a purification medium and remove impurities such as water vapor, air, and oil vapor from the purification medium. The purification medium can be helium.
[0058] like Figure 1 and Figure 2 As shown, the purification device 1000 may include a housing 100, a liquid nitrogen dewar 200, a heat exchanger 300, and a filter 400.
[0059] The liquid nitrogen Dewar 200 is housed within the outer casing 100 and can be used to provide a cryogenic environment.
[0060] Combined again Figure 5 and Figure 7 The heat exchanger 300 can be disposed between the liquid nitrogen Dewar 200 and the outer shell 100. That is, the heat exchanger 300 is located outside the liquid nitrogen Dewar 200. In addition, the heat exchanger 300 can be configured with a first heat exchange channel 310 and a second heat exchange channel 320.
[0061] The filter 400 can be installed inside the liquid nitrogen Dewar 200. The output end of the first heat exchange channel 310 can be connected to the inlet 4121 of the filter 400, allowing the purification medium to be purified to be delivered to the filter 400. The input end of the second heat exchange channel 320 can be connected to the output 4122 of the filter 400, allowing the purified medium to be output. The filter 400 can filter the purification medium to achieve the purification effect.
[0062] Combined again Figure 3 and Figure 4 In some embodiments, the output end of the first heat exchange channel 310 and the inlet 4121 of the filter 400 can be connected via a third pipe 553. The input end of the second heat exchange channel 320 and the output 4122 of the filter 400 can be connected via a fourth pipe 554.
[0063] During operation, the input end of the first heat exchange channel 310 can be connected to the purification medium source to be purified, thereby obtaining the purification medium. The purification medium can then be conveyed to the filter 400 via the first heat exchange channel 310, where it is filtered to achieve purification. The purified medium can then be output through the second heat exchange channel 320, the output end of which can be connected to a device that receives the purified medium, allowing the purified medium to be delivered to that device.
[0064] In this embodiment, the heat exchanger 300 is located outside the liquid nitrogen Dewar 200 and can be used as a cold shield structure to change the heat transfer path between the liquid nitrogen Dewar 200 and the external environment, reduce the heat exchange between the liquid nitrogen Dewar 200 and the external environment, and significantly reduce the cold loss of the liquid nitrogen Dewar 200, thereby reducing the cold loss in the purification equipment and reducing energy consumption.
[0065] like Figure 1 and Figure 2 As shown, the outer casing 100 may further include an outer casing body 110. The outer casing body 110 may have a can-shaped structure with a hollow interior. In some embodiments, an explosion-proof plate 130 is also provided around the outer casing body 110 to release pressure and prevent the outer casing 100 from exploding due to pressure buildup, thus ensuring the safety of surrounding personnel, should a leak occur in the internal piping of the purification equipment 1000.
[0066] In addition, the purification device 1000 also includes casters 700, which can be installed on the near-ground side of the housing body 110, that is, the side of the housing body 110 closest to the ground. This allows for easy movement of the purification device 1000. Correspondingly, the far-ground side of the housing body 110 refers to the side furthest from the ground.
[0067] like Figures 1 to 5 As shown, in some embodiments, the heat exchanger 300 may be formed by winding heat exchange tubes and presenting a spiral structure. In the embodiments, the heat exchanger 300 may include an inner tube 330 and an outer tube 340, with the outer tube 340 being spaced apart from the outer side of the inner tube 330. A first heat exchange channel 310 may be formed inside the inner tube 330, and a second heat exchange channel 320 may be formed between the inner tube 330 and the outer tube 340.
[0068] Additionally, the heat exchanger 300 includes a first end 301 and a second end 302. The first end 301 may be disposed near the ground side of the housing body 110, and the second end 302 may be disposed near the far ground side of the housing body 110. In some embodiments, the diameter of the first end 301 may be larger than the diameter of the second end 302. Accordingly, the heat exchanger 300 may generally have a conical structure.
[0069] In this embodiment, the input end of the first heat exchange channel 310 can be located near the first end 301, and the output end of the first heat exchange channel 310 can be located near the second end 302. The input end of the second heat exchange channel 320 can be located near the second end 302, and the output end of the second heat exchange channel 320 can be located near the first end 301. The output end of the first heat exchange channel 310 can be connected to the input port 4121 of the filter 400 through a third pipe 553. The input end of the second heat exchange channel 320 can be connected to the output port 4122 of the filter 400 through a fourth pipe 554.
[0070] In some embodiments, the purification device 1000 further includes a plurality of supports 600 for supporting the heat exchanger 300. The plurality of supports 600 can be fixedly installed inside the housing body 110 and are arranged around the periphery of the liquid nitrogen Dewar 200. The heat exchanger 300 can be inserted into the plurality of supports 600 and can be kept in a spiral shape by the limiting effect of the supports 600 and fixed in the housing body 110.
[0071] like Figure 1 , Figure 3 and Figure 4 As shown, the purification device 1000 also includes a purification medium inlet pipe 510 and a purification medium outlet pipe 520. Both the purification medium inlet pipe 510 and the purification medium outlet pipe 520 can be installed on the far side of the housing body 110. Furthermore, one end of both the purification medium inlet pipe 510 and the purification medium outlet pipe 520 can extend into the interior of the housing body 110.
[0072] The purification medium inlet pipe 510, located near the interior of the outer casing 110, is connected to the inlet of the first heat exchange channel 310 in the heat exchanger 300 via a first pipe 551. The other end of the purification medium inlet pipe 510 can be used to connect to the source of the purification medium to be purified. The purification medium outlet pipe 520, located near the interior of the outer casing 110, is connected to the outlet of the second heat exchange channel 320 in the heat exchanger 300 via a second pipe 552. The other end of the purification medium outlet pipe 520 can be used to connect to a device for receiving the purified medium, such as a helium refrigerator.
[0073] Additionally, a first self-sealing connector 511 can be connected to the end of the purification medium inlet pipe 510 that is furthest from the interior of the outer casing 110. A second self-sealing connector 521 can be installed at the end of the purification medium outlet pipe 520 that is furthest from the interior of the outer casing 110. This allows for convenient and quick assembly and disassembly of the corresponding pipelines.
[0074] In some embodiments, a discharge valve 512 is also connected to the end of the purification medium inlet pipe 510 near the first self-sealing connector 511. A purge valve 522 and a second pressure relief valve 523 are also connected to the end of the purification medium outlet pipe 520 near the second self-sealing connector 521. The second pressure relief valve 523 can relieve pressure when it is too high, thereby reducing the occurrence of safety accidents and improving the safety of the purification equipment 1000.
[0075] In some embodiments, the purification device 1000 further includes a first pressure gauge 531 and a second pressure gauge 541. The first pressure gauge 531 is connected to one end of the first transmission pipe 530 and protrudes from the far side of the housing body 110. The end of the first transmission pipe 530 away from the first pressure gauge 531 is connected to the end of the third pipe 553 near the inlet 4121 of the filter 400. Additionally, the end of the first transmission pipe 530 near the first pressure gauge 531 is also connected to a first pressure relief valve 533 and a drain valve 532. The first pressure relief valve 533 can release pressure when it is too high, thereby reducing the probability of safety accidents and improving the safety of the purification device 1000.
[0076] The second pressure gauge 541 can be connected to one end of the second transmission pipe 540 and protrudes from the far side of the housing body 110. The end of the second transmission pipe 540 away from the second pressure gauge 541 can be connected to the end of the fourth pipe 554 near the output port 4122 of the filter 400. The end of the second transmission pipe 540 near the second pressure gauge 541 is also connected to a vacuum valve 542.
[0077] In this embodiment, the first pressure gauge 531 and the second pressure gauge 541 can detect the pressure of the purification medium input pipe 510 / output pipe, providing a reference for the operating status of the purification equipment 1000, and can determine the purity of the purification medium based on the rate of change of pressure drop. Specifically, when the pressure drop changes significantly, it indicates that the purity of the purification medium has decreased, and the filter component 420 needs to be activated.
[0078] In addition, the purification device 1000 also includes a heat insulation medium (not shown), which can be filled inside the outer shell 100. Specifically, the heat insulation medium can be filled between the outer shell 100 and the heat exchanger 300, and between the heat exchanger 300 and the liquid nitrogen Dewar 200, which can reduce heat conduction and reduce the loss of cold energy in the liquid nitrogen Dewar 200.
[0079] like Figure 1 and Figure 6As shown, the liquid nitrogen Dewar 200 may include a main tank portion 210 and at least one connecting pipe 220. The main tank portion 210 may be located within the outer casing 110. One end of the connecting pipe 220 may extend into the outer casing 110 and communicate with the end of the main tank portion 210 near the far side of the outer casing 110. The other end of the connecting pipe 220 may protrude relative to the far side of the outer casing 110.
[0080] In some embodiments, the liquid nitrogen Dewar 200 may include three connecting pipes 220, namely a first connecting pipe 221, a second connecting pipe 222, and a third connecting pipe 223. The first connecting pipe 221, the second connecting pipe 222, and the third connecting pipe 223 are all connected to the end of the main tank portion 210 near the ground side of the outer shell body 110, and the ends of the first connecting pipe 221, the second connecting pipe 222, and the third connecting pipe 223 away from the main tank portion 210 may pass through the ground side of the outer shell body 110 and protrude.
[0081] In some embodiments, the first connecting pipe 221 allows nitrogen to be input into the main tank 210. The second connecting pipe 222 allows liquid nitrogen and nitrogen gas to be discharged from the main tank 210. In an embodiment, the purification device 1000 also includes a float level gauge 800, the ball of which can be located inside the main tank 210, and the rod of which can be inserted through a third connecting pipe 223 and protrude from the end of the third connecting pipe 223 away from the main tank 210. During use, the operator can observe the amount of liquid nitrogen in the liquid nitrogen dewar 200 through the float level gauge 800, which allows for timely replenishment when the liquid nitrogen is insufficient.
[0082] In this embodiment, the outer casing 100 further includes three sleeves 120. The three sleeves 120 protrude from the far side of the outer casing body 110 and communicate with the interior of the outer casing body 110. Additionally, the three sleeves 120 can be correspondingly fitted onto the periphery of the three connecting pipes 220. In this embodiment, the connection method between the three connecting pipes 220 and their corresponding sleeves 120 can be the same; the following detailed description uses the first connecting pipe 221 as an example.
[0083] The sleeve 120 can be spaced around the periphery of the first connecting pipe 221, i.e., a gap is provided between the first connecting pipe 221 and the sleeve 120. Additionally, the first connecting pipe 221 can protrude from the end of the sleeve 120 away from the outer shell 110. In this embodiment, a connecting ring 140 is also provided at the end of the sleeve 120 away from the outer shell 110. The connecting ring 140 can connect between the sleeve 120 and the outer wall of the first connecting pipe 221, and can also provide corresponding support for the first connecting pipe 221, improving the installation stability of the liquid nitrogen Dewar 200.
[0084] In this embodiment, by providing a sleeve 120 on the outer shell 100, the connecting pipe 220 and the outer shell body 110 are thermally connected through the sleeve 120, which can extend the heat transfer path between the connecting pipe 220 and the outer shell 100 and reduce the cold loss of the liquid nitrogen Dewar 200.
[0085] In other embodiments, the liquid nitrogen Dewar 200 may also be provided with one or two equal numbers of connecting pipes 220.
[0086] like Figure 7 As shown, filter 400 may include housing assembly 410, adsorption medium (not shown) and filter assembly 420.
[0087] The housing assembly 410 may include a housing body 411, a first end cap 412, and a second end cap 413. The housing body 411 may generally be tubular. The first end cap 412 may be fixedly connected to the end of the housing body 411 near the ground side of the outer shell 110 by means of threaded connection, welding, bonding, or interference fit, that is, the first end cap 412 is located at the bottom of the housing body 411. The second end cap 413 may be detachably connected to the end of the housing body 411 near the ground side of the outer shell 110 by means of threaded connection, that is, the second end cap 413 is connected to the top of the housing body 411. It is understood that the first end cap 412 and the housing body 411, and the second end cap 413 and the housing body 411 are sealed connections, for example, a sealing effect may be achieved by means of a sealing gasket.
[0088] The adsorption medium can be filled into the housing assembly 410. When it is necessary to replace the adsorption medium, it can be replaced by opening the second end cover 413.
[0089] In some embodiments, activated carbon can be selected as the adsorption medium. The adsorption medium can adsorb impurity gases such as water vapor, air, and oil vapor in the purification medium, and filter the purification medium.
[0090] In other embodiments, the adsorption medium may also be a molecular sieve or other similar medium.
[0091] Combined again Figure 4 In this embodiment, the first end cap 412 may have an inlet 4121 and an outlet 4122 arranged side by side. The inlet 4121 may be connected to the end of the third pipe 553 away from the output end of the first heat exchange channel 310. The outlet 4122 may be connected to the end of the fourth pipe 554 away from the input end of the second heat exchange channel 320.
[0092] In this embodiment, filter components 420 are disposed at both the inlet 4121 and the outlet 4122, and the filter components 420 may be located on the side of the first end cap 412 near the second end cap 413. During use, the filter components 420 can filter the passing purification medium, removing impurities such as dust particles from the purification medium. In this embodiment, the structures of the two filter components 420 may be similar; the filter component 420 at the inlet 4121 will be described in detail below as an example.
[0093] Combined again Figure 8 In some embodiments, the filter assembly 420 may include a first porous plate 422, a filter sheet 423, a second porous plate 424, and a mounting base 421 with a stepped tubular structure. One end of the mounting base 421 may be sealed through the inlet 4121 and connected to the end of the third pipe 553 away from the output end of the first heat exchange channel 310.
[0094] The other end of the mounting base 421 can be located within the housing assembly 410 and can be used as a carrier for the first porous plate 422, the filter sheet 423, and the second porous plate 424. In the embodiment, the first porous plate 422, the filter sheet 423, and the second porous plate 424 can be stacked sequentially within the mounting base 421, and the first porous plate 422 can be positioned close to the third pipe 553. When the purification medium passes through the filtration assembly 420, the filter sheet 423 can filter dust particles and other contaminants in the purification medium, improving the cleanliness of the purification medium. In some embodiments, the filter sheet 423 can be made of wool felt.
[0095] like Figure 7 As shown, in some embodiments, the filter assembly 420 further includes a flow guide tube 430. One end of the flow guide tube 430 can be fixedly installed on the filter assembly 420 near the inlet 4121 and can communicate with the inlet 4121. The other end of the flow guide tube 430 can extend towards the second end cap 413, with a gap between it and the second end cap 413. During use, the flow guide tube 430 can guide the purification medium entering the filter assembly 420, allowing the purification medium to fully pass through the adsorption medium and improve the purification effect.
[0096] Combined again Figure 6 In some embodiments, the filter assembly 420 further includes an assembly tube 440. The assembly tube 440 may include a closed end and an open end. The end of the assembly tube 440 near the open end may be fixed to the second end cap 413 by means of adhesive bonding, welding, or threaded connection, and protrudes from the side of the second end cap 413 away from the first end cap 412. In some embodiments, the open end of the assembly tube 440 may be in communication with the first connecting pipe 221 of the liquid nitrogen Dewar 200. The closed end of the assembly tube 440 may be inserted into the housing assembly 410 and extend towards the first end cap 412.
[0097] When it is necessary to heat and activate the adsorption medium, an electric heating rod can be inserted into the assembly tube 440 through the first connecting tube 221, so that the heat generated by the electric heating rod can be transferred to the adsorption medium through the assembly tube 440 to heat and activate the adsorption medium.
[0098] In this embodiment, after heat exchange in heat exchanger 300, the temperature of the purification medium can be reduced to around 100K. At this point, water vapor and air with a high liquefaction point have been removed from the medium. Filter 400 removes impurities such as dust from the purification medium. The purification medium enters filter 400, which is immersed in liquid nitrogen. The temperature of the medium further decreases after passing through filter 400. Utilizing the strong low-temperature adsorption properties of activated carbon, the medium is further purified to meet usage requirements, and impurities are removed within filter 400. After the purification medium exits from filter 400, it can enter heat exchanger 300 from the input end of the second heat exchange channel 320. The accompanying cooling energy is returned to the purification medium through heat exchanger 300. Correspondingly, the temperature near the second end 302 of heat exchanger 300 is lower than the temperature at its first end 301. That is, the temperature of heat exchanger 300 generally exhibits a pattern of lower temperature at the top and higher temperature at the bottom.
[0099] In this embodiment, the diameter of the second end 302 of the heat exchanger 300 is smaller than the diameter of the first end 301. Correspondingly, the insulation medium between the heat exchanger 300 and the outer shell 100 can be relatively thicker near the second end 302 of the heat exchanger 300. During operation, the lower part of the heat exchanger 300 is close to room temperature, while the upper part is close to the liquid nitrogen temperature range (-196°C). The conical structure allows the insulation medium in the upper part to be thicker than that in the lower part, while maintaining the same diameter of the outer shell 100. This achieves a thicker insulation medium at low temperatures and a thinner insulation medium at high temperatures, making reasonable use of limited space, minimizing heat leakage, and reducing energy consumption.
[0100] When using purification equipment 1000, the following operations can be performed:
[0101] (1) Add liquid nitrogen to the liquid nitrogen Dewar 200 for pre-cooling preparation. The initial amount of liquid nitrogen added can be approximately 25L. Specifically, nitrogen gas at a lower temperature can be introduced into the liquid nitrogen Dewar 200 first, and then liquid nitrogen can be slowly introduced. This can prevent tearing damage to the liquid nitrogen Dewar 200 due to drastic temperature changes when liquid nitrogen is directly introduced. In addition, the first connecting pipe 221 and the second connecting pipe 222 can be observed. When the gas output is uniform and slow, and the two self-sealing joints no longer freeze, it indicates that the purification equipment 1000 has reached equilibrium and stability.
[0102] (2) Connect the purification medium inlet pipe 510 and the purification medium outlet pipe 520 to the purification medium pipeline. The purification medium to be purified can enter the purification equipment 1000 through the purification medium inlet pipe 510, and the purified medium can be output from the purification equipment 1000 through the purification medium outlet pipe 520.
[0103] (3) During the purification process of the purification medium, the liquid nitrogen level in the liquid nitrogen Dewar 200 can be observed through the float level gauge 800, and liquid nitrogen can be replenished in time.
[0104] (4) After use, the purification medium inlet pipe 510 and the purification medium outlet pipe 520 can be disconnected from the purification medium pipeline. The first self-sealing connector 511 and the second self-sealing connector 521 can achieve self-sealing function. The remaining liquid nitrogen in the liquid nitrogen Dewar 200 can be purged with hot nitrogen gas or discharged to a safe place.
[0105] In actual operation, operators must wear gloves and goggles at all times when filling the liquid nitrogen Dewar 200 with liquid nitrogen to ensure safety and prevent the purification equipment 1000 from rolling, moving, or being damaged. Simultaneously, surrounding electrical equipment should also be protected against moisture.
[0106] When the adsorption medium in purification device 1000 or filter 400 is saturated during initial use, and the purification capacity of purification device 1000 cannot meet the requirements, the following operations can be performed:
[0107] (1) Disconnect the first self-sealing connector 511 and the second self-sealing connector 521 from the purification medium pipeline.
[0108] (2) Insert the electric heating rod into the assembly tube 440 of the filter 400 through the first connecting tube 221 and connect the power cord.
[0109] (3) Open the drain valve 532 to release or recover the dirty helium gas inside the purification equipment 1000.
[0110] (4) Connect the purge valve 522 to a hot nitrogen source to purge the internal pipelines of the purification equipment 1000 with hot nitrogen. The temperature of the hot nitrogen can be controlled at 100℃ and the pressure less than or equal to 2 bara. Nitrogen can be discharged from the exhaust valve 512. During this period, an electric heating rod can be turned on to heat the adsorption medium, which can shorten the purge time. It is understood that after the purification equipment 1000 has been used, the internal pipelines (heat exchanger 300 and filter 400, etc.) of the purification equipment 1000 are in a low-temperature environment. In the initial stage of purge, the temperature of the discharged nitrogen will also be relatively low. The temperature of the gas discharged from the exhaust valve 512 can be detected, and the purging can be stopped when the temperature reaches room temperature.
[0111] (5) After the purging is completed, connect the evacuation valve 542 to the vacuum pump, perform a vacuum pumping operation on the internal pipeline of the purification device 1000, and detect the vacuum degree of the internal pipeline of the purification device 1000 through the vacuum gauge equipped with the vacuum pump, so that the vacuum degree is less than 10 Pa. During this period, the electric heating rod can be turned on at regular intervals to heat the adsorption medium in the filter 400 to improve the activation efficiency of the adsorption medium. The opening time of the electric heating rod generally does not exceed one hour to ensure that structures such as the gasket in the filter 400 will not be melted by high temperature.
[0112] (6) Close the evacuation valve 542, open the purge valve 522, and connect the purge valve 522 to a high-purity helium source to fill the purification device 1000 with high-purity helium gas to normal pressure, and then close the purge valve 522.
[0113] (7) Open the evacuation valve 542 for vacuum replacement. Detect the vacuum degree of the internal pipeline of the purification device 1000 through the vacuum gauge equipped with the vacuum pump, so that the vacuum degree is less than 10 Pa. During this period, the electric heating rod can be turned on at regular intervals to heat the adsorption medium in the filter 400 to improve the activation efficiency of the adsorption medium. The first opening time of the electric heating rod is generally about one hour to ensure that the temperature of the activated carbon does not exceed 100 degrees Celsius. The subsequent opening time of the electric heating rod is flexibly determined according to the length of the interval time, usually about half an hour.
[0114] (8) Repeat steps (6) and (7) twice to complete the replacement.
[0115] When it is necessary to replace the adsorption medium in the filter 400, the following operations can be carried out:
[0116] (1) The second end cover 413 of the filter 400 can be opened by tools such as a wrench.
[0117] (2) Invert the filter 400 to pour out the adsorption medium.
[0118] (3) Place the filter 400 upright.
[0119] (4) New adsorption medium can be filled into the filter 400 through a funnel.
[0120] (5) Install the second end cover 413 on the shell main body 411 of the filter 400.
[0121] In addition, when first used after replacing the adsorption medium, the second end cover 413 can be cold-tightened with the shell main body 411 after being pre-cooled by liquid nitrogen to improve the sealing effect.
[0122] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0123] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A purification device, characterized in that, include: shell; A liquid nitrogen Dewar is disposed within the outer casing; A heat exchanger, comprising heat exchange tubes wound in a spiral structure, is wound between the liquid nitrogen Dewar and the outer shell. The heat exchanger includes a first heat exchange channel and a second heat exchange channel. The heat exchanger has a first end and a second end, with the first end located near the ground side of the outer shell and the second end located near the far ground side of the outer shell. The diameter of the first end is larger than the diameter of the second end. The input end of the first heat exchange channel is located near the first end, and the output end of the first heat exchange channel is located near the second end. The input end of the second heat exchange channel is located near the second end, and the output end of the second heat exchange channel is located near the first end. A filter is installed inside the liquid nitrogen Dewar, with the filter's inlet connected to the output end of the first heat exchange channel and the filter's output end connected to the input end of the second heat exchange channel. The insulating medium is filled between the outer shell and the heat exchanger, and between the heat exchanger and the liquid nitrogen Dewar, with the upper insulating medium being thicker than the lower insulating medium.
2. The purification apparatus according to claim 1, characterized in that, The liquid nitrogen Dewar includes a main tank and at least one connecting pipe, and the outer shell includes an outer shell body and at least one set of pipes; The main tank is disposed within the outer shell body. One end of the at least one connecting pipe is connected to the interior of the main tank. The end of the at least one connecting pipe away from the main tank passes through the outer shell body and protrudes relative to the outer shell body. There is a gap between the connecting pipe and the outer shell body. The at least one sleeve is disposed on the side of the outer shell body away from the main tank portion. The at least one sleeve is fitted around the periphery of the at least one connecting pipe in a corresponding and spaced manner. A connecting ring is also provided at the end of the sleeve away from the outer shell body. The connecting ring is connected between the sleeve and the corresponding connecting pipe.
3. The purification apparatus according to claim 1, characterized in that, The filter includes: The housing assembly has both the inlet and outlet of the filter located at the same end. An adsorption medium is filled in the housing assembly, and the adsorption medium is used to filter impurity gases in the purification medium. The filter assembly is provided at both the inlet and the outlet, and is used to filter particulate impurities in the purification medium.
4. The purification apparatus according to claim 3, characterized in that, The filter assembly includes a first porous plate, a filter sheet, and a second porous plate stacked in sequence.
5. The purification apparatus according to claim 3 or 4, characterized in that, The filter also includes a flow guide tube disposed in the housing assembly, one end of which is connected to the inlet, and the other end of which extends away from the inlet.
6. The purification apparatus according to claim 3 or 4, characterized in that, The filter further includes an assembly tube inserted into the housing assembly. The assembly tube includes a closed end and an open end. The closed end is located in the housing assembly, and the open end protrudes from the end of the housing assembly away from the inlet. The assembly tube is used to insert an electric heating rod.
7. The purification apparatus according to claim 6, characterized in that, The liquid nitrogen Dewar includes a main tank and a first connecting pipe; One end of the first connecting pipe is connected to the interior of the main tank and is connected to the open end of the assembly pipe. The end of the first connecting pipe away from the main tank is inserted through the outer shell and protrudes relative to the outer shell.
8. The purification apparatus according to claim 3 or 4, characterized in that, The housing assembly includes a housing body, a first end cap, and a second end cap, which are respectively disposed at both ends of the housing body; The input port and the output port are located on the first end cover, and the second end cover is detachably connected to the shell body.
9. The purification apparatus according to claim 1, characterized in that, The purification equipment also includes a purification medium inlet pipe and a purification medium outlet pipe; One end of the purification medium input pipe is connected to the input end of the first heat exchange channel, and the other end of the purification medium input pipe is connected to a first self-sealing joint. One end of the purification medium output tube is connected to the output end of the second heat exchange channel, and the other end of the purification medium output tube is connected to a second self-sealing connector.