CN212538458U - Neon gas liquefying device - Google Patents
Neon gas liquefying device Download PDFInfo
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- CN212538458U CN212538458U CN202020951146.5U CN202020951146U CN212538458U CN 212538458 U CN212538458 U CN 212538458U CN 202020951146 U CN202020951146 U CN 202020951146U CN 212538458 U CN212538458 U CN 212538458U
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Abstract
The utility model relates to a neon liquefaction technical field discloses a neon liquefaction device. The neon liquefaction device includes: a secondary refrigerator having a primary cold head and a secondary cold head; the primary heat exchanger is connected with the primary cold head, and the primary cold head provides cold energy for the primary heat exchanger; the air inlet pipe is used for conveying external neon to the first-stage heat exchanger for precooling to a set temperature; the condenser is connected with the secondary cold head, and the secondary cold head provides cold energy for the condenser; the gas pipe is communicated with the gas inlet pipe and is used for conveying the precooled neon to the condenser, and the precooled neon is cooled to the boiling point temperature through the condenser and is liquefied into liquid neon; a dewar for storing said liquid neon; and the infusion tube is connected with the condenser and the dewar tank and is used for conveying the liquid neon to the dewar tank. The utility model discloses can effectual cooling neon, increase neon's liquefaction rate.
Description
Technical Field
The utility model relates to a neon liquefaction technical field especially relates to a neon liquefaction device.
Background
Refrigerant is required in many research works, such as measurement of hall coefficient of high purity substances at low temperatures, cooling of lyocell, cooling of computational control elements, and in the acquisition of high and ultra-high vacuum. In the past, liquid hydrogen is used as a refrigerant, and the liquid hydrogen explodes due to careless use, so that serious accidents are caused. Neon (Ne) is a colorless, odorless, non-flammable noble gas. The liquid neon can obtain the use temperature in the range of 24-43K, so the liquid neon can be used for replacing the liquid hydrogen. The latent heat of vaporization of liquid neon is very large, 3.3 times that of liquid hydrogen, i.e., when the same volume of liquid is vaporized, the cold energy obtained from liquid neon is 2.3 times more than that obtained from liquid hydrogen. Research work with liquid neon can be performed in a conventional dewar without additional liquid nitrogen protection, with continuous operating times several times greater than liquid hydrogen. And because neon is inert, neon liquefaction and its use in cooling systems is very safe.
At present, neon liquefaction equipment is less, and the neon liquefaction device that is comparatively close adopts stirling cycle refrigerator's neon liquefaction equipment, and this flow adopts bipolar backheat formula refrigerator to do the cold source, uses the automatic liquid neon of discharging of low temperature solenoid valve, and the low temperature solenoid valve can produce the cold loss problem, and whether its design is correct directly influences liquid neon and can in time discharge.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the embodiment of the utility model provides a neon liquefaction device is proposed, can effectual cooling neon, increase the liquefaction rate of neon.
According to the utility model discloses neon liquefaction device, include:
a secondary refrigerator having a primary cold head and a secondary cold head;
the primary heat exchanger is connected with the primary cold head, and the primary cold head provides cold energy for the primary heat exchanger;
the air inlet pipe is used for conveying external neon to the first-stage heat exchanger for precooling to a set temperature;
the condenser is connected with the secondary cold head, and the secondary cold head provides cold energy for the condenser;
the gas pipe is communicated with the gas inlet pipe and is used for conveying the precooled neon to the condenser, and the precooled neon is cooled to the boiling point temperature through the condenser and is liquefied into liquid neon;
a dewar for storing said liquid neon;
and the infusion tube is connected with the condenser and the dewar tank and is used for conveying the liquid neon to the dewar tank.
According to the utility model discloses an embodiment still includes temperature regulating device, temperature regulating device locates second grade cold head department is used for control the temperature of second grade cold head is between boiling temperature and triple point temperature.
According to an embodiment of the present invention, the temperature control device is any one of a heating wire, a heating sheet, or a heating rod.
According to the utility model discloses an embodiment still includes the vacuum cover, one-level cold head, second grade cold head, one-level heat exchanger, intake pipe, condenser and gas-supply pipe all locate in the vacuum cover.
According to the utility model discloses an embodiment still includes the radiation screen, the radiation screen is located in the vacuum chamber, one-level cold head, second grade cold head, one-level heat exchanger, condenser and gas-supply pipe are all located in the radiation screen.
According to the utility model discloses an embodiment, be constructed with annular fin in the one-level heat exchanger, form the runner of restraint gas flow direction between annular fin.
According to the utility model discloses an embodiment, be constructed with a plurality of radiating fin in the condenser.
According to the utility model discloses an embodiment, intake pipe, one-level cold junction, one-level heat exchanger, gas-supply pipe, second grade cold junction, condenser, transfer line and dewar jar set gradually from last to down according to the neon flow direction.
According to the utility model discloses an embodiment, the secondary refrigerator still includes the refrigerator body, the refrigerator body is installed the top of vacuum cover, the refrigerator body the one-level cold head and the secondary cold head connects gradually.
Compared with the prior art, the utility model discloses an above-mentioned technical scheme has following beneficial effect at least:
the neon gas liquefying device provided by the embodiment of the utility model makes full use of the primary and secondary cold quantities of the secondary refrigerator, and the heat exchange area in the primary heat exchanger is large enough, so that the primary cold quantity of the refrigerator can effectively cool the neon gas, and the neon gas is fully precooled to a set temperature, such as about 60K, thereby reducing the load of the secondary cold head and increasing the liquefaction rate of neon; the neon gas is liquefied by directly using the refrigerating machine as a cold source under normal pressure.
Furthermore, because the boiling point temperature of neon gas is close to the temperature of a triple point under normal pressure, a temperature control device is added at the secondary cold head of the refrigerator, for example, a heating plate is placed, and the temperature of the secondary cold head is accurately controlled between the boiling point temperature and the temperature of the triple point, so that the neon gas can be liquefied, and can not be solidified.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a neon gas liquefaction device according to an embodiment of the present invention;
fig. 2 is an axial sectional view of a primary heat exchanger in a neon gas liquefaction device according to an embodiment of the present invention.
Reference numerals:
1. a refrigerator body; 2. an air inlet pipe; 3. a first-stage cold head; 4. a primary heat exchanger; 41. an annular fin; 5. a gas delivery pipe; 6. a second-stage cold head; 7. a condenser; 8. a radiation screen; 9. a vacuum hood; 10. a transfusion tube; 11. a dewar tank.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
As shown in fig. 1, for the neon liquefaction device provided by the embodiment of the present invention, the embodiment is mainly applicable to a small neon liquefaction device, and mainly comprises a secondary refrigerator, a primary heat exchanger 4, an air inlet pipe 2, a condenser 7, an air delivery pipe 5, a dewar tank 11 and an infusion tube 10.
Specifically, the two-stage refrigerator is provided with a first-stage cold head 3 and a second-stage cold head 6, the lowest refrigerating temperature of the second-stage cold head 6 is below 20K (Kelvin), and enough cold energy is provided for liquefied neon under normal pressure. The cold head is a part for the refrigerator to provide cold energy to the outside in a centralized way and can be used as a part for the refrigerator to output the cold energy to the outside; one-level cold head and second grade cold head have a temperature gradient, assume that one-level cold head temperature is 60K, and second grade cold head temperature can be less than one-level cold head, and the temperature that is equivalent to the second grade cold head has reduced some again on the basis of one-level cold head temperature, and the difference of two cold heads lies in the temperature difference.
Because neon has the characteristics of high viscosity, high density, low thermal conductivity, large latent heat of vaporization and the like, in the heat transfer process, the cold energy utilization aspect of the refrigerating machine in the prior art is not perfect, the embodiment fully utilizes the primary and secondary cold energy of the secondary refrigerating machine by arranging the secondary refrigerating machine, precools neon by utilizing the primary cold energy, and cools the precooled neon to the boiling point by utilizing the secondary cold energy, thereby providing reliable guarantee for the smooth liquefaction of neon into neon liquid.
The primary heat exchanger 4 is connected with the primary cold head 3, the primary cold head 3 provides cold for the primary heat exchanger 4, and the primary heat exchanger 4 is cooled to about 60K.
The gas inlet pipe 2 conveys the external neon to the first-stage heat exchanger 4 for precooling, mainly takes away sensible heat of the neon, and precools the neon to a set temperature of 60K for example.
The condenser 7 is connected with the secondary cold head 6, the secondary cold head 6 provides cold for the condenser 7, and the temperature is controlled to be about 25K.
Wherein, gas-supply pipe 5 with intake pipe 2 intercommunication for carry the neon after the precooling to condenser 7, through condenser 7 is cooled down to boiling point temperature by 60K with the neon after the precooling to further take away the phase transition latent heat of neon, successfully liquefy neon into liquid neon.
Wherein, Dewar jar 11 is used for storing the liquid neon, has good heat preservation performance.
Wherein, transfer line 10 connect condenser 7 with dewar jar 11 for will pass through the liquid neon that condenser 7 formed after the cooling carries to dewar jar 11.
According to the utility model discloses an embodiment, neon liquefaction device still includes temperature regulating device, temperature regulating device locates second grade cold head 6 department is used for control the temperature of second grade cold head 6 is between boiling point temperature and triple point temperature, controls second grade cold head 6 temperature promptly between 24.4K-27.17K.
Because the boiling point temperature of neon gas is close to the temperature of a three-phase point under normal pressure, the temperature control device is added at the second-stage cold head 6 of the refrigerator, if a heating plate is placed, the temperature of the second-stage cold head 6 is accurately controlled between the boiling point temperature and the temperature of the three-phase point, so that the neon gas can be liquefied, and the neon gas cannot be solidified.
According to the utility model discloses an embodiment, temperature regulating device is any one of heater strip (not shown in the figure), heating plate or heating rod, and further, heater strip, heating plate or heating rod are connected to electrical control equipment, by electrical control equipment control heating temperature, realize accurate accuse temperature.
According to the utility model discloses an embodiment, neon liquefaction device still includes vacuum hood 9, one-level cold head 3, second grade cold head 6, one-level heat exchanger 4, intake pipe 2, condenser 7 and gas-supply pipe 5 all locate in the vacuum hood 9. The vacuum cover 9 provides a vacuum environment for the above parts, and the refrigeration performance of the secondary refrigerator is ensured to the maximum extent.
According to the utility model discloses an embodiment, neon liquefaction device still includes radiation screen 8, radiation screen 8 is located in the vacuum chamber 9, one-level cold head 3, second grade cold head 6, one-level heat exchanger 4, condenser 7 and gas-supply pipe 5 all locate in radiation screen 8, radiation screen 8 is provided cold volume by the one-level cold head 3 of second grade refrigerator, can effectively reduce radiation heat leakage.
According to the utility model discloses an embodiment, as shown in FIG. 2, the cyclic annular fin 41 has been constructed in one-level heat exchanger 4, form the runner of restraint gas flow direction between cyclic annular fin 41, the runner that cyclic annular fin 41 produced has the effect of restraint gas flow direction, the direction that the arrow head is shown in FIG. 2 is gas flow direction, make the neon air current in with the abundant heat transfer of one-level heat exchanger 4 wall, through the flow of upper and lower direction, purified the air current, mixed trace impurity (like nitrogen gas) solidifies as the solid in the in-process of progressively cooling in the gas, leave over in this one-level heat exchanger 4 bottom, can not follow the air current and continue on operating on next step down. That is, the ring-shaped fins 41 not only can provide enough heat exchange area for precooling neon, but also can play a role in purifying neon.
According to the utility model discloses an embodiment, a plurality of radiating fin have been constructed in the condenser 7 to guarantee sufficient heat transfer area, do not have special requirement to radiating fin's shape.
According to the utility model discloses an embodiment, intake pipe 2, one-level cold head 3, one-level heat exchanger 4, gas-supply pipe 5, second grade cold head 6, condenser 7, transfer line 10 and dewar jar 11 set gradually from last to down according to the neon flow direction, and the circulation route is short, and cold volume loss is little.
According to the utility model discloses an embodiment, the secondary refrigerator still includes refrigerator body 1, refrigerator body 1 is installed the top of vacuum hood 9, refrigerator body 1 the one-level cold head 3 and secondary cold head 6 connects gradually, plays the fixed action to refrigerator body 1 through vacuum hood 9, plays the installation fixed action to one-level cold head 3 and secondary cold head 6 by refrigerator body 1.
In one embodiment, the process of liquefaction of neon is substantially as follows: neon enters a first-stage heat exchanger 4 through an air inlet pipe 2 for precooling, precooled 60K gas is conveyed to a condenser 7 through an air conveying pipe 5 for further cooling, the 60K gas is cooled to the boiling point temperature and is converted into liquid neon, and the liquid neon is conveyed to a Dewar tank 11 through a liquid conveying pipe 10 for storage and use.
The embodiment of the utility model makes full use of the primary and secondary cold quantities of the secondary refrigerator, and the heat exchange area in the primary heat exchanger 4 is large enough, so that the primary cold quantity of the refrigerator can effectively cool neon, and the neon can be fully precooled to a set temperature, such as about 60K, thereby reducing the load of the secondary cold head 6 and increasing the liquefaction rate of neon; the neon gas is liquefied by directly using the refrigerating machine as a cold source under normal pressure.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A neon gas liquefaction device, comprising:
a secondary refrigerator having a primary cold head and a secondary cold head;
the primary heat exchanger is connected with the primary cold head, and the primary cold head provides cold energy for the primary heat exchanger;
the air inlet pipe is used for conveying external neon to the first-stage heat exchanger for precooling to a set temperature;
the condenser is connected with the secondary cold head, and the secondary cold head provides cold energy for the condenser;
the gas pipe is communicated with the gas inlet pipe and is used for conveying the precooled neon to the condenser, and the precooled neon is cooled to the boiling point temperature through the condenser and is liquefied into liquid neon;
a dewar for storing said liquid neon;
and the infusion tube is connected with the condenser and the dewar tank and is used for conveying the liquid neon to the dewar tank.
2. The neon liquefaction device of claim 1, further comprising a temperature control device disposed at said secondary cold head for controlling the temperature of said secondary cold head between a boiling point temperature and a triple point temperature.
3. The neon gas liquefaction device of claim 2, wherein the temperature control device is any one of a heating wire, a heating sheet or a heating rod.
4. The neon liquefaction device of claim 1, further comprising a vacuum hood, wherein the primary cold head, the secondary cold head, the primary heat exchanger, the inlet duct, the condenser and the gas delivery duct are all disposed in the vacuum hood.
5. The neon liquefaction device of claim 4, further comprising a radiation screen, wherein the radiation screen is disposed within the vacuum enclosure, and the primary cold head, the secondary cold head, the primary heat exchanger, the condenser, and the gas delivery conduit are disposed in the radiation screen.
6. The neon gas liquefaction device of claim 1, wherein said primary heat exchanger is internally configured with annular fins defining flow passages therebetween that restrict the direction of gas flow.
7. The neon liquefaction device of claim 1, wherein a plurality of heat dissipating fins are configured within said condenser.
8. The neon liquefaction device of claim 1, wherein the inlet tube, the primary cold head, the primary heat exchanger, the gas delivery tube, the secondary cold head, the condenser, the liquid delivery tube and the dewar are arranged in sequence from top to bottom according to the neon flow direction.
9. The neon gas liquefaction device of claim 4, wherein said secondary refrigerator further comprises a refrigerator body mounted on top of said vacuum enclosure, said refrigerator body, said primary cold head and said secondary cold head being connected in series.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020951146.5U CN212538458U (en) | 2020-05-29 | 2020-05-29 | Neon gas liquefying device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020951146.5U CN212538458U (en) | 2020-05-29 | 2020-05-29 | Neon gas liquefying device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115388615A (en) * | 2022-04-19 | 2022-11-25 | 北京师范大学 | Argon liquefaction system |
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- 2020-05-29 CN CN202020951146.5U patent/CN212538458U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115388615A (en) * | 2022-04-19 | 2022-11-25 | 北京师范大学 | Argon liquefaction system |
| CN115388615B (en) * | 2022-04-19 | 2023-11-24 | 北京师范大学 | Argon liquefaction system |
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