CN220959204U - Purification equipment - Google Patents

Abstract

The application discloses purification equipment, and relates to the technical field of helium purification. The purification equipment comprises a shell, a liquid nitrogen Dewar, a heat exchanger and a filter; liquid nitrogen Du Washe is disposed within the housing; the heat exchanger is arranged between the liquid nitrogen Dewar and the shell and comprises a first heat exchange channel and a second heat exchange channel; the filter set up in the liquid nitrogen Dewar, the input port of filter with the output intercommunication of first heat transfer passageway, the delivery outlet of filter with the input intercommunication of second heat transfer passageway. The purification equipment provided by the application can reduce the cold energy loss and reduce the energy consumption.

Description

Purification equipment

Technical Field

The application relates to the technical field of helium purification, in particular to purification equipment.

Background

In the ultra-low temperature field, the refrigeration capacity is usually obtained by liquid helium, which can be obtained by refrigerating helium by a helium refrigerator system. The helium refrigerator system has extremely high purity requirement on helium, and the impurity gas content is required to be less than or equal to 5ppm. When the helium refrigerator system is installed on site, dust is brought into pipelines between the skids, welding slag and other impurities are brought into the pipelines during welding, so that the whole system needs to be purified before the system starts to normally run, and the impurities are removed, and generally, the purification treatment is needed through a purification device.

However, when the existing purification device works, heat leakage is serious, the cold energy loss is more, and the energy consumption is larger.

Disclosure of utility model

The application provides a purifying device for reducing heat leakage in the process of purifying helium.

The present application provides a purification apparatus comprising:

a housing;

The liquid nitrogen Dewar is arranged in the shell;

the heat exchanger is arranged between the liquid nitrogen Dewar and the shell and comprises a first heat exchange channel and a second heat exchange channel;

The filter is arranged in the liquid nitrogen Dewar, an input port of the filter is communicated with an output end of the first heat exchange channel, and an output port of the filter is communicated with an input end of the second heat exchange channel.

Based on the technical scheme, in the use process, the heat exchanger can form a cold screen structure on the outer side of the liquid nitrogen dewar, so that the heat transfer path between the liquid nitrogen dewar and the external environment can be changed, the heat exchange between the liquid nitrogen dewar and the external environment is reduced, the cold energy loss of the liquid nitrogen dewar is greatly reduced, the cold energy loss of purification equipment can be reduced, and the energy consumption is reduced.

In some possible embodiments, the heat exchanger is wound in a helical configuration from a heat exchange tube, the heat exchanger comprising a first end and a second end, the first end having a diameter greater than a diameter of the second end;

The input end of the first heat exchange channel is close to the first end, and the output end of the first heat exchange channel is close to the second end;

the input end of the second heat exchange channel is close to the second end, and the output end of the second heat exchange channel is close to the first end;

The purification device comprises a heat preservation medium filled between the shell and the heat exchanger and between the heat exchanger and the liquid nitrogen Dewar.

In some possible embodiments, the liquid nitrogen dewar comprises a main tank portion and at least one communication tube, the housing comprising a housing body and at least one sleeve;

the main body tank part is arranged in the shell body, one end of the at least one communication pipe is communicated with the inside of the main body tank part, one end of the at least one communication pipe, which is far away from the main body tank part, penetrates through the shell body and protrudes relative to the shell body, and a gap exists between the communication pipe and the shell body;

The at least one sleeve is arranged on one side of the shell body, which is far away from the main tank part, and is sleeved on the peripheral side of the at least one communication pipe in a one-to-one correspondence and interval manner, and a linking ring is further arranged at one end of the sleeve, which is far away from the shell body, and is linked between the sleeve and the corresponding communication pipe.

In some possible embodiments, the filter comprises:

the input port and the output port of the filter are both arranged at the same end of the shell assembly;

The adsorption medium is filled in the shell component and is used for filtering impurity gas in the purification medium;

The filter assembly is used for filtering particle impurities in the purification media.

In some possible embodiments, the filter assembly comprises a first perforated plate, a filter sheet, and a second perforated plate, which are sequentially stacked.

In some possible embodiments, the filter further comprises a flow guide tube disposed in the housing assembly, one end of the flow guide tube being in communication with the input port, the other end of the flow guide tube extending away from the input port.

In some possible embodiments, the filter further comprises a fitting tube inserted into the housing assembly, the fitting tube comprising a closed end and an open end, the closed end being located in the housing assembly, the open end protruding relative to an end of the housing assembly remote from the input port, the fitting tube for inserting an electrical heating rod.

In some possible embodiments, the liquid nitrogen dewar comprises a main tank portion and a first communication tube;

One end of the first communication pipe is communicated with the inside of the main body tank part and is communicated with the opening end of the assembling pipe oppositely;

one end of the first communication pipe, which is far away from the main body tank part, penetrates through the shell and protrudes relative to the shell.

In some possible embodiments, 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;

the input port and the output port are arranged on the first end cover, and the second end cover is detachably connected with the shell main body.

In some possible embodiments, the purification apparatus further comprises a purification medium inlet pipe and a purification medium outlet pipe;

one end of the purification medium input pipe is communicated with the input end of the first heat exchange channel, and the other end of the purification medium input pipe is connected with a first self-sealing joint;

One end of the purification medium output pipe is communicated with the output end of the second heat exchange channel, and the other end of the purification medium output pipe is connected with a second self-sealing joint.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows a schematic diagram of the structure of a purification apparatus in some embodiments;

FIG. 2 is a schematic cross-sectional view of a purification apparatus in some embodiments;

FIG. 3 shows a schematic diagram of the structure of the piping within the purification apparatus in some embodiments;

FIG. 4 shows another schematic of the piping within the purification apparatus in some embodiments;

FIG. 5 illustrates a partial schematic view of a heat exchanger in some embodiments;

FIG. 6 is a schematic cross-sectional view of a liquid nitrogen Dewar and a filter in some embodiments;

FIG. 7 illustrates a schematic cross-sectional structure of a filter in some embodiments;

fig. 8 illustrates a schematic cross-sectional structure of a filter assembly in some embodiments.

Description of main reference numerals:

1000-purifying equipment;

100-a housing; 110-a housing body; 120-sleeve; 130-explosion-proof sheet; 140-adapter rings;

200-liquid nitrogen Dewar; 210-a main body tank portion; 220-communicating pipe; 221-a first communication pipe; 222-a second communication pipe; 223-a third communication pipe;

300-heat exchanger; 301-a first end; 302-a second end; 310-a first heat exchange channel; 320-a second heat exchange channel; 330-an inner tube; 340-an outer tube;

400-a filter; 410-a housing assembly; 411-a shell body; 412-first end cap; 4121-an input port; 4122-outlet; 413-a second end cap; 420-a filter assembly; 421-fixing base; 422-a first porous plate; 423-filter sheets; 424-a second porous plate; 430-a flow guide pipe; 440-fitting a pipe;

510-purification medium input tube; 511-a first self-sealing joint; 512-discharge valve; 520-purification medium output pipe; 521-a second self-sealing joint; 522-a purge valve; 523-a second pressure relief valve; 530-a first transfer tube; 531-a first pressure gauge; 532-a blow-down valve; 533-first pressure relief valve; 540-a second transfer tube; 541-a second pressure gauge; 542-evacuation valve; 551-first conduit; 552-a second conduit; 553-a third pipe; 554-fourth conduit;

600-bracket;

700-casters;

800-floating ball level gauge.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

In the description of the present 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

As shown in fig. 1, in an embodiment, a purifying apparatus 1000 is provided, which can be used for purifying a purifying medium, and can remove impurity gases such as water vapor, air, oil vapor, and the like in the purifying medium. Wherein the purification medium may be helium.

As shown in fig. 1 and 2, the purification apparatus 1000 may include a housing 100, a liquid nitrogen dewar 200, a heat exchanger 300, and a filter 400.

Wherein a liquid nitrogen dewar 200 is disposed within the housing 100 and is operable to provide a cryogenic environment.

Referring again to fig. 5 and 7, a heat exchanger 300 may be disposed between the liquid nitrogen dewar 200 and the housing 100. That is, heat exchanger 300 is located outside of liquid nitrogen dewar 200. In addition, the heat exchanger 300 may be configured with a first heat exchange channel 310 and a second heat exchange channel 320.

Filter 400 may be disposed within liquid nitrogen dewar 200. The output of the first heat exchange channel 310 may be in communication with an input 4121 of the filter 400, which may deliver the purification medium to be purified to the filter 400. The input end of the second heat exchange channel 320 may be in communication with the output port 4122 of the filter 400, and may be used to output the purified purification medium. The filter 400 may filter the purification medium to be purified to achieve the purification effect.

Referring again to fig. 3 and 4, in some embodiments, the output of the first heat exchange channel 310 may be in communication with the input 4121 of the filter 400 via a third conduit 553. The input end of the second heat exchange channel 320 may be in communication with the output port 4122 of the filter 400 via a fourth conduit 554.

In the working process, the input end of the first heat exchange channel 310 can be communicated with a purifying medium source to be purified, the purifying medium to be purified can be obtained, the purifying medium to be purified can be conveyed to the filter 400 through the first heat exchange channel 310, and the purifying medium to be purified can be filtered through the filter 400, so that the purifying effect is achieved. The purified purification medium may be output through the second heat exchange channel 320, and an output end of the second heat exchange channel 320 may be in communication with and may transfer the purified medium to a device receiving the purified purification medium.

In the embodiment, the heat exchanger 300 is located at the outer side of the liquid nitrogen dewar 200, and can be used as a cold shield structure, so as 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, greatly reduce the cold loss of the liquid nitrogen dewar 200, and reduce the cold loss of the purification equipment and reduce the energy consumption.

As shown in fig. 1 and 2, further, the housing 100 may include a housing body 110. The housing body 110 may have a tank-shaped structure, and a hollow structure inside. In some embodiments, the explosion-proof plate 130 is further disposed on the peripheral side of the housing body 110, so as to release pressure when the pipeline inside the purification apparatus 1000 leaks, and prevent the housing 100 from explosion due to pressure holding, so as to ensure the safety of surrounding operators.

In addition, the purifying apparatus 1000 further includes casters 700, which may be mounted on the ground-proximal side of the housing body 110, i.e., the side of the housing body 110 near the ground. Thus, the movement of the purification apparatus 1000 can be conveniently realized. Accordingly, the distal side of the housing body 110 may refer to a side away from the ground.

As shown in fig. 1-5, in some embodiments, the heat exchanger 300 may be wound from heat exchange tubes and present a helical configuration. In an embodiment, the heat exchanger 300 may include an inner tube 330 and an outer tube 340, and the outer tube 340 may be sleeved outside the inner tube 330 at intervals. The first heat exchange channel 310 may be formed inside the inner tube 330, and the second heat exchange channel 320 may be formed between the inner tube 330 and the outer tube 340.

In addition, the heat exchanger 300 further includes a first end 301 and a second end 302. The first end 301 may be disposed proximate to the proximal side of the housing body 110 and the second end 302 may be disposed proximate to the distal side of the housing body 110. In some embodiments, the diameter of the first end 301 may be greater than the diameter of the second end 302. Accordingly, the heat exchanger 300 may generally exhibit a tapered configuration.

In an embodiment, the input end of the first heat exchange channel 310 may be disposed proximate to the first end 301, and the output end of the first heat exchange channel 310 may be disposed proximate to the second end 302. The input end of the second heat exchange channel 320 may be disposed proximate the second end 302 and the output end of the second heat exchange channel 320 may be disposed proximate the first end 301. The output of the first heat exchange channel 310 may be in communication with the input 4121 of the filter 400 via a third conduit 553. The input of the second heat exchange channel 320 may be in communication with the output 4122 of the filter 400 via a fourth conduit 554.

In some embodiments, the purification apparatus 1000 further comprises a plurality of brackets 600 for supporting the heat exchanger 300. The plurality of brackets 600 may be fixedly installed inside the housing body 110 and circumferentially disposed around the liquid nitrogen dewar 200. The heat exchanger 300 may be inserted into the plurality of brackets 600, and may be maintained in a spiral shape by the limiting action of the brackets 600, and fixed in the housing body 110.

As shown in fig. 1, 3 and 4, the purification apparatus 1000 further includes a purification medium input pipe 510 and a purification medium output pipe 520. Both the purification medium input pipe 510 and the purification medium output pipe 520 may be installed at a remote side of the housing body 110. And one end of the purification medium input pipe 510 and one end of the purification medium output pipe 520 may extend to the inside of the housing body 110.

Wherein, the end of the purification medium input tube 510 near the interior of the housing body 110 can be communicated with the input end of the first heat exchange channel 310 in the heat exchanger 300 through the first pipeline 551. The other end of purification medium input tube 510 may be used to connect a source of purification medium to be purified. One end of the purification medium output pipe 520 near the inside of the housing body 110 may be connected to the output end of the second heat exchange channel 320 in the heat exchanger 300 through the second pipe 552. The other end of the purification medium outlet tube 520 may be used to connect to a device that receives the purified purification medium, such as a helium refrigerator.

In addition, a first self-sealing adapter 511 may be connected to an end of the purification medium input tube 510 remote from the interior of the housing body 110. The end of the purification medium delivery conduit 520 remote from the interior of the housing body 110 may be fitted with a second self-sealing adapter 521. Therefore, the corresponding pipeline can be conveniently and quickly assembled and disassembled.

In some embodiments, a drain valve 512 is also connected to the end of the purification medium inlet tube 510 proximate the first self-sealing connector 511. The purification medium output pipe 520 is also connected with a purge valve 522 and a second pressure relief valve 523 near one end of the second self-sealing joint 521. The second pressure release valve 523 can release pressure when the pressure is too high, so as to reduce the occurrence of safety accidents and improve the use safety of the purifying device 1000.

In some embodiments, purification apparatus 1000 further comprises a first pressure gauge 531 and a second pressure gauge 541. The first pressure gauge 531 may be connected to one end of the first transmission pipe 530 and protrudes from the remote side of the housing body 110. The end of the first transfer tube 530 remote from the first pressure gauge 531 may be connected to the end of the third conduit 553 proximate to the input port 4121 of the filter 400. In addition, a first pressure release valve 533 and a drain valve 532 are further connected to the end of the first transmission pipe 530 near the first pressure gauge 531. The first pressure release valve 533 can release pressure when the pressure is too high, so as to reduce the occurrence probability of safety accidents and improve the use safety of the purifying device 1000.

The second pressure gauge 541 may be connected to one end of the second transmission pipe 540 and protrudes from the remote side of the housing body 110. The end of the second transfer tube 540 remote from the second pressure gauge 541 may be connected to the end of the fourth tube 554 proximate to the output port 4122 of the filter 400. The second transfer tube 540 is also connected to an evacuation valve 542 at one end thereof adjacent to the second pressure gauge 541.

In an embodiment, the first pressure gauge 531 and the second pressure gauge 541 can detect the pressure of the purifying medium input pipe 510/output pipe, provide a reference for the operation state of the purifying apparatus 1000, and can determine the purity of the purifying medium according to the change speed of the pressure drop. In particular, when the pressure drop variation is large, it may be indicated that the purity of the purification medium is reduced and the filter assembly 420 requires an activation process.

In addition, the purification apparatus 1000 further includes a heat-insulating medium (not shown), which may be filled in the housing 100. Specifically, the heat preservation medium can be filled between the shell 100 and the heat exchanger 300, and between the heat exchanger 300 and the liquid nitrogen dewar 200, so that heat conduction can be reduced, and the loss of cold in the liquid nitrogen dewar 200 can be reduced.

As shown in fig. 1 and 6, the liquid nitrogen dewar 200 may include a main tank portion 210 and at least one communication tube 220. Wherein the main body can 210 may be located within the housing body 110. One end of the communication pipe 220 may extend into the housing body 110 and communicate with one end of the main tank 210 near the far side of the housing body 110. The other end of the communication pipe 220 may be convexly disposed with respect to the distal side of the housing body 110.

In some embodiments, liquid nitrogen dewar 200 may include three communicating tubes 220, namely a first communicating tube 221, a second communicating tube 222, and a third communicating tube 223. The first communication pipe 221, the second communication pipe 222, and the third communication pipe 223 are all connected to one end of the main body tank part 210 near the far side of the housing body 110, and one end of the first communication pipe 221, the second communication pipe 222, and the third communication pipe 223 far from the main body tank part 210 may be disposed through the far side of the housing body 110 and protrude.

In some embodiments, the first communication pipe 221 may provide for nitrogen to be input into the body tank 210. The second communication pipe 222 may be used to discharge liquid nitrogen and nitrogen gas in the main body tank part 210. In an embodiment, the purification apparatus 1000 further includes a floating ball level gauge 800, wherein a ball of the floating ball level gauge 800 may be located in the main body tank 210, and a stem of the floating ball level gauge 800 may be disposed through the third communicating pipe 223 and protrude with respect to an end of the third communicating pipe 223 away from the main body tank 210. During the use, operating personnel can observe the liquid nitrogen quantity in the liquid nitrogen dewar 200 through the floating ball liquid level meter 800, and the liquid nitrogen can be conveniently and timely supplemented when the liquid nitrogen is insufficient.

In an embodiment, the housing 100 further comprises three bushings 120. The three sleeves 120 may be convexly disposed at a distal side of the housing body 110 and communicate with an interior of the housing body 110. In addition, the three sleeves 120 may be sleeved on the circumferential sides of the three communication pipes 220 in a one-to-one correspondence. In the embodiment, the connection manner of the three connection pipes 220 and the corresponding sleeves 120 may be the same, and the first connection pipe 221 will be described in detail below.

The sleeve 120 is sleeved on the circumference of the first communication pipe 221 at intervals, i.e. a gap is provided between the first communication pipe 221 and the sleeve 120. In addition, the first communication pipe 221 may protrude with respect to an end of the sleeve 120 remote from the housing body 110. In an embodiment, an end of the sleeve 120 far away from the housing body 110 is further provided with a connection ring 140, and the connection ring 140 can be connected between the sleeve 120 and the outer sidewall of the first communication pipe 221, and can also provide corresponding support for the first communication pipe 221, so as to improve the installation stability of the liquid nitrogen dewar 200.

In the embodiment, by providing the sleeve 120 on the shell 100, the heat transmission path between the communicating tube 220 and the shell 100 can be prolonged by the heat transmission connection between the communicating tube 220 and the shell body 110 through the sleeve 120, and the cooling loss of the liquid nitrogen dewar 200 can be reduced.

In other embodiments, liquid nitrogen dewar 200 may also be provided with one or two equal numbers of communication tubes 220.

As shown in fig. 7, filter 400 may include a housing assembly 410, an adsorption media (not shown), and a filter assembly 420.

Wherein the housing assembly 410 may comprise a housing body 411, a first end cap 412 and a second end cap 413. The housing body 411 may have a substantially tubular structure. The first end cap 412 may be fixedly connected to an end of the housing body 411 near the proximal side of the housing body 110 by a threaded connection, welding, bonding, or interference fit, that is, the first end cap 412 is disposed at the bottom of the housing body 411. The second end cap 413 may be detachably coupled to an end of the housing main body 411 near the distal side of the housing body 110 by a screw coupling manner, i.e., the second end cap 413 is coupled to the top of the housing main body 411. It will be appreciated that the first end cap 412 is in sealing connection with the housing body 411 and the second end cap 413 is in sealing connection with the housing body 411, for example, by a gasket or the like.

The adsorption media may be filled in the housing assembly 410. When the adsorption media needs to be replaced, the second end cover 413 can be opened to replace the adsorption media.

In some embodiments, the adsorption media may be activated carbon. The adsorption medium can adsorb impurity gases such as water vapor, air, oil vapor and the like in the purification medium, and filter the purification medium.

In other embodiments, the adsorption media may also be selected from molecular sieves and the like.

Referring again to fig. 4, in an embodiment, the first end cap 412 may be provided with an input port 4121 and an output port 4122 that are disposed in parallel. Wherein the input port 4121 may be in communication with an end of the third conduit 553 remote from the output end of the first heat exchange channel 310. The output port 4122 may be in communication with an end of the fourth conduit 554 remote from the input end of the second heat exchange channel 320.

In an embodiment, the input port 4121 and the output port 4122 are each configured with a filter assembly 420, and the filter assembly 420 may be located on a side of the first end cap 412 adjacent to the second end cap 413. In use, the filter assembly 420 can filter the passing purification medium to remove impurities such as dust particles in the purification medium. In the embodiment, the structure of the two filter assemblies 420 may be similar, and the filter assemblies 420 at the position of the input port 4121 will be described in detail below as an example.

Referring again to fig. 8, in some embodiments, the filter assembly 420 may include a first porous plate 422, a filter 423, a second porous plate 424, and a fixing seat 421 having a stepped tubular structure. One end of the fixing seat 421 can be inserted into the input port 4121 in a sealing manner, and is connected to one end of the third pipeline 553 away from the output end of the first heat exchange channel 310.

The other end of the fixing seat 421 may be located in the housing assembly 410 and may serve as a carrier for the first porous plate 422, the filter 423, and the second porous plate 424. In an embodiment, the first porous plate 422, the filter 423, and the second porous plate 424 may be sequentially stacked and installed in the fixing seat 421, and the first porous plate 422 may be disposed near the third pipeline 553. When the purification medium passes through the filter assembly 420, dust particles and the like in the purification medium can be filtered by the filter 423, so that the cleanliness of the purification medium is improved. In some embodiments, the filter 423 may be wool felt.

As shown in fig. 7, in some embodiments, the filter assembly 420 further includes a draft tube 430. One end of the draft tube 430 may be fixedly mounted to the filter assembly 420 proximate the input port 4121 and may be in communication with the input port 4121. The other end of the guide tube 430 may extend in a direction approaching the second end cover 413 with a gap left between the guide tube and the second end cover 413. In the use process, the flow guiding tube 430 can guide the purification medium entering the filter assembly 420, so that the purification medium can fully pass through the adsorption medium, and the purification effect is improved.

Referring again to fig. 6, in some embodiments, the filter assembly 420 further includes a mounting tube 440. The mounting tube 440 may include a closed end and an open end. Wherein, the end of the fitting tube 440 near the open end may be fixed to the second end cover 413 by bonding, welding or screwing, etc., and protrudes with respect to the side of the second end cover 413 far from the first end cover 412. In an embodiment, the open end of the fitting tube 440 may be in opposite communication with the first communication tube 221 of the liquid nitrogen dewar 200. The closed end of the mounting tube 440 may be inserted within the housing assembly 410 and extend in a direction toward the first end cap 412.

When the adsorption medium needs to be heated and activated, an electric heating rod can be inserted into the assembly pipe 440 through the first communication pipe 221, so that heat generated by the electric heating rod is transferred to the adsorption medium through the assembly pipe 440, and the adsorption medium is heated and activated.

In an embodiment, after the purification medium is subjected to heat exchange by the heat exchanger 300, the temperature can be reduced to about 100K, at this time, the water vapor in the medium and the air with a higher liquefaction point are removed, and impurities such as dust in the purification medium can be removed by the filter 400. The purification medium enters the filter 400, and the temperature of the purification medium is further reduced after the filter 400 is soaked in liquid nitrogen, so that the purification medium can be further purified by utilizing the strong low-temperature adsorptivity of the activated carbon, the use requirement is met, and impurities are removed in the filter 400. After the purification medium is output from the filter 400, it can enter the heat exchanger 300 from the input end of the second heat exchanging channel 320, and the additional cold energy can be returned to the purification medium to be purified through the heat exchanger 300. Accordingly, the temperature of the heat exchanger 300 near the second end 302 will be lower than the temperature of the first end 301. That is, the temperature of the heat exchanger 300 is approximately represented as being high up and low down.

In an 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 housing 100 may be relatively thick near the second end 302 of the heat exchanger 300. In operation, the lower part of the heat exchanger 300 is close to normal temperature, the upper part of the heat exchanger 300 is close to a liquid nitrogen temperature zone (-196 ℃), and the conical structure can ensure that the thickness of an upper heat preservation medium is thicker than that of a lower heat preservation medium on the premise of unchanged diameter of the shell 100, so that the thickness of the low-temperature heat preservation medium is realized, the thickness of the high-temperature heat preservation medium is thinner, the limited space is reasonably utilized, the heat leakage is reduced to the maximum extent, and the energy consumption is reduced.

When the purification apparatus 1000 is used, the following operations may be performed:

(1) Liquid nitrogen is added to the liquid nitrogen Dewar 200 for pre-chilling, wherein the initial liquid nitrogen addition may be about 25L. Specifically, nitrogen gas with lower temperature can be firstly filled into the liquid nitrogen Dewar 200, and then liquid nitrogen is slowly filled, so that tearing damage caused by temperature change can be prevented when the liquid nitrogen Dewar 200 is directly filled with liquid nitrogen. In addition, the first communication pipe 221 and the second communication pipe 222 can be observed, and when the air outlet is uniform and slow, and the two self-sealing joints are not frozen any more, the purification device 1000 can be shown to reach equilibrium stability.

(2) The purifying medium input pipe 510 and the purifying medium output pipe 520 are connected to the purifying medium pipeline, the purifying medium to be purified can enter the purifying device 1000 through the purifying medium input pipe 510, and the purified purifying medium can be output to the purifying device 1000 through the purifying medium output pipe 520.

(3) In the process of purifying the purification medium, the liquid level condition of the liquid nitrogen in the liquid nitrogen Dewar 200 can be observed through the floating ball liquid level meter 800, and the liquid nitrogen can be timely supplemented.

(4) When the use is completed, the purification medium inlet pipe 510 and the purification medium outlet pipe 520 are disconnected from the purification medium pipe, and the first self-sealing joint 511 and the second self-sealing joint 521 can realize a self-sealing function. The remaining liquid nitrogen in liquid nitrogen dewar 200 may be purged with hot nitrogen or vented to a safe location.

In actual operation, when filling liquid nitrogen into the liquid nitrogen dewar 200, the operator needs to wear gloves and goggles in the whole process to make protective measures, and the purifying device 1000 should be protected from rolling, moving, damage and the like. Meanwhile, the surrounding electrical equipment and the like should be subjected to moisture-proof measures.

When the adsorption medium in the purification apparatus 1000 or the filter 400 is saturated for the first time, the purification capability of the purification apparatus 1000 cannot be satisfied, the following operations may be performed:

(1) The first 511 and second 521 self-sealing connectors are disconnected from the purification media line.

(2) The electric heating rod is inserted into the fitting tube 440 of the filter 400 through the first communication tube 221 and connected to a power line.

(3) The blowdown valve 532 is opened to bleed or recover the dirty helium gas from the interior of the purification apparatus 1000.

(4) The purge valve 522 is connected to a hot nitrogen source to purge the internal piping of the purification apparatus 1000 with hot nitrogen, wherein the temperature of the hot nitrogen can be controlled at 100 ℃ and the pressure is 2bara or less. In addition, nitrogen may be vented from vent valve 512. During this period, the electric heating rod can be turned on, and the adsorption medium can be heated by the electric heating rod, so that the purging time can be shortened. It will be appreciated that after the purification apparatus 1000 is used, the internal piping (such as the heat exchanger 300 and the filter 400) of the purification apparatus 1000 is in a low temperature environment, and the temperature of the discharged nitrogen gas is relatively low at the initial stage of purging, so that the temperature of the discharged gas can be detected at the position of the discharge valve 512, and the operation can be stopped when the temperature reaches the normal temperature.

(5) After purging, the evacuation valve 542 is connected to a vacuum pump to perform a vacuum pumping operation on the internal pipeline of the purification apparatus 1000, and the vacuum degree of the internal pipeline of the purification apparatus 1000 is detected by a vacuum gauge matched with the vacuum pump, so that the vacuum degree is less than 10 Pa. During this time, the electric heating rod may be turned on once every a period of time to heat the adsorption medium in the filter 400, so as to improve the activation efficiency of the adsorption medium. The on time of the electric heating rod is generally not more than one hour, so that the sealing gasket and other structures in the filter 400 are ensured not to be melted at high temperature.

(6) The evacuation valve 542 is closed, the purge valve 522 is opened, and the purge valve 522 is connected to a high purity helium source, and the purification apparatus 1000 is filled with high purity helium gas to normal pressure, and then the purge valve 522 is closed.

(7) The evacuation valve 542 is opened, and evacuation replacement is performed. The vacuum degree of the pipeline inside the purification equipment 1000 is detected by a vacuum gauge matched with a vacuum pump, and the vacuum degree is smaller than 10 Pa. During this time, the electric heating rod may be turned on once every a period of time to heat the adsorption medium in the filter 400, so as to improve the activation efficiency of the adsorption medium. The first time of the electric heating rod is about one hour, so that the temperature of the activated carbon is ensured not to exceed 100 ℃. The turn-on time of the subsequent electric heating rod is flexibly determined according to the length of the interval time, and the interval is usually about half an hour.

(8) Repeating the step (6) and the step (7) twice to finish the replacement.

When the adsorption medium in the filter 400 needs to be replaced, the following operations may be performed:

(1) The second end cap 413 of the filter 400 may be opened by a wrench or the like.

(2) The filter 400 is inverted and the adsorption media can be poured out.

(3) The filter 400 is placed in the front.

(4) The filter 400 may be filled with new adsorption media through a funnel.

(5) The second end cap 413 is attached to the housing body 411 of the filter 400.

In addition, when the adsorption medium is replaced for the first time, the second end cover 413 can be cooled tightly with the shell main body 411 after liquid nitrogen precooling, so that the sealing effect is improved.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. A purification apparatus, comprising:

a housing;

The liquid nitrogen Dewar is arranged in the shell;

the heat exchanger is arranged between the liquid nitrogen Dewar and the shell and comprises a first heat exchange channel and a second heat exchange channel;

The filter is arranged in the liquid nitrogen Dewar, an input port of the filter is communicated with an output end of the first heat exchange channel, and an output port of the filter is communicated with an input end of the second heat exchange channel.

2. The purification apparatus of claim 1, wherein the heat exchanger is wound from a heat exchange tube in a helical configuration, the heat exchanger comprising a first end and a second end, the first end having a diameter greater than a diameter of the second end;

The input end of the first heat exchange channel is close to the first end, and the output end of the first heat exchange channel is close to the second end;

the input end of the second heat exchange channel is close to the second end, and the output end of the second heat exchange channel is close to the first end;

The purification device comprises a heat preservation medium filled between the shell and the heat exchanger and between the heat exchanger and the liquid nitrogen Dewar.

3. The purification apparatus of claim 1 or 2, wherein the liquid nitrogen dewar comprises a main tank portion and at least one communication tube, the housing comprising a housing body and at least one sleeve;

the main body tank part is arranged in the shell body, one end of the at least one communication pipe is communicated with the inside of the main body tank part, one end of the at least one communication pipe, which is far away from the main body tank part, penetrates through the shell body and protrudes relative to the shell body, and a gap exists between the communication pipe and the shell body;

The at least one sleeve is arranged on one side of the shell body, which is far away from the main tank part, and is sleeved on the peripheral side of the at least one communication pipe in a one-to-one correspondence and interval manner, and a linking ring is further arranged at one end of the sleeve, which is far away from the shell body, and is linked between the sleeve and the corresponding communication pipe.

4. The purification apparatus of claim 1, wherein the filter comprises:

the input port and the output port of the filter are both arranged at the same end of the shell assembly;

The adsorption medium is filled in the shell component and is used for filtering impurity gas in the purification medium;

The filter assembly is used for filtering particle impurities in the purification media.

5. The purification apparatus of claim 4, wherein the filter assembly comprises a first perforated plate, a filter sheet, and a second perforated plate stacked in sequence.

6. The purification apparatus of claim 4 or 5, wherein the filter further comprises a draft tube disposed in the housing assembly, one end of the draft tube being in communication with the input port, the other end of the draft tube extending in a direction away from the input port.

7. The purification apparatus of claim 4 or 5, wherein the filter further comprises a fitting tube inserted into the housing assembly, the fitting tube comprising a closed end and an open end, the closed end being located in the housing assembly, the open end protruding relative to an end of the housing assembly remote from the input port, the fitting tube for inserting an electrical heating rod.

8. The purification apparatus of claim 7, wherein the liquid nitrogen dewar comprises a main tank portion and a first communication tube;

One end of the first communication pipe is communicated with the inside of the main body tank part and is communicated with the opening end of the assembling pipe oppositely;

one end of the first communication pipe, which is far away from the main body tank part, penetrates through the shell and protrudes relative to the shell.

9. The purification apparatus of claim 4 or 5, wherein the housing assembly comprises 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;

the input port and the output port are arranged on the first end cover, and the second end cover is detachably connected with the shell main body.

10. The purification apparatus of claim 1, further comprising a purification medium inlet pipe and a purification medium outlet pipe;

one end of the purification medium input pipe is communicated with the input end of the first heat exchange channel, and the other end of the purification medium input pipe is connected with a first self-sealing joint;

One end of the purification medium output pipe is communicated with the output end of the second heat exchange channel, and the other end of the purification medium output pipe is connected with a second self-sealing joint.