CN112271051A - Superconducting magnet low-temperature heat exchange device - Google Patents
Superconducting magnet low-temperature heat exchange device Download PDFInfo
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- CN112271051A CN112271051A CN202011264001.9A CN202011264001A CN112271051A CN 112271051 A CN112271051 A CN 112271051A CN 202011264001 A CN202011264001 A CN 202011264001A CN 112271051 A CN112271051 A CN 112271051A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/04—Cooling
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Abstract
The invention discloses a superconducting magnet low-temperature heat exchange device.A liquid storage container is communicated with a gas storage tank through a pipeline, and a gaseous heat-conducting medium is circulated between the liquid storage container and the gas storage tank through the pipeline; the refrigerator cools the heat-conducting medium through a low-temperature heat exchanger arranged in the liquid storage container, so that the heat-conducting medium is liquefied and falls into the liquid storage container, and the low-temperature heat exchanger exchanges heat with the heat-conducting medium, so that the heat-conducting medium is liquefied into liquid and is deposited at the bottom of the liquid storage container; the superconducting coil is placed in the low-temperature cold screen and is not contacted with a liquid heat-conducting medium, the heat-conducting medium is converted into low-temperature liquid through the low-temperature heat exchanger of the refrigerator, the liquid storage container is kept at low temperature, the superconducting coil is kept at low temperature through the heat-conducting line, and the superconducting coil does not need to be immersed in the liquid heat-conducting medium, so that the using amount of the liquid heat-conducting medium can be reduced.
Description
Technical Field
The invention relates to the technical field of superconducting equipment, in particular to a superconducting magnet low-temperature heat exchange device.
Background
At present, a container with liquid helium is widely used in the field of superconducting magnets, and a cooling mode of soaking liquid helium is adopted to provide a low-temperature environment required by an NbTi superconducting wire. Because the superconducting wire needs to be soaked in liquid helium, more low-temperature liquid is consumed in the process of cooling to steady-state operation; when liquid helium is added, the machine needs to be stopped, and the maintenance process is complicated; and the magnet has longer power failure and quench time when running.
For those skilled in the art, how to reduce the amount of liquid helium required for maintaining the superconducting cryogenic environment is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a superconducting magnet low-temperature heat exchange device, which enables a superconducting coil to keep low temperature in a heat conduction mode, reduces the consumption of liquid helium required by maintaining a superconducting low-temperature environment, and has the following specific scheme:
a superconducting magnet low-temperature heat exchange device comprises a liquid storage container, a gas storage tank, a low-temperature cold screen, a normal-temperature container and a refrigerator, wherein the liquid storage container and the gas storage tank are communicated through a pipeline;
the refrigerator cools heat-conducting media through a low-temperature heat exchanger arranged in the liquid storage container, so that the heat-conducting media are liquefied and fall into the liquid storage container;
a superconducting coil is arranged in the low-temperature cold screen, and heat is transferred between the superconducting coil and the liquid storage container through a heat conducting wire.
Optionally, the heat conducting line is connected with the bottom of the liquid storage container through a heat conducting flange; and radiating fins for increasing the heat exchange area are respectively arranged at the contact positions between the heat conduction flange and the liquid storage container.
Optionally, the thermal conductivity of the heat conducting flange is not lower than that of stainless steel; the liquid storage container and the heat conduction flange are welded and fixed.
Optionally, the heat conducting wire is a soft copper wire.
Optionally, an air supplement port is arranged on the air storage tank, and a heat conducting medium is supplemented into the air storage tank through the air supplement port.
Optionally, one or more of helium, nitrogen, argon and neon are stored in the liquid storage container and the gas storage tank.
Optionally, a heat exchange seat for conducting heat is arranged at a contact position of the low-temperature cold shield and the liquid storage container.
Optionally, the low-temperature cold shield and the normal-temperature container are of a boss structure with a small top and a large bottom, the superconducting coil is located at the large bottom of the lower portion of the low-temperature cold shield, and the liquid storage container is located at the small top of the upper portion of the low-temperature cold shield; the low-temperature cold screen is positioned at the large bottom of the lower part of the normal-temperature container, and the refrigerating machine is positioned at the small top of the upper part of the normal-temperature container.
The invention provides a superconducting magnet low-temperature heat exchange device, wherein a liquid storage container is communicated with a gas storage tank through a pipeline, and a gaseous heat-conducting medium is circulated between the liquid storage container and the gas storage tank through the pipeline; the refrigerator cools the heat-conducting medium through a low-temperature heat exchanger arranged in the liquid storage container, so that the heat-conducting medium is liquefied and falls into the liquid storage container, and the low-temperature heat exchanger exchanges heat with the heat-conducting medium, so that the heat-conducting medium is liquefied into liquid and is deposited at the bottom of the liquid storage container; the superconducting coil is placed in the low-temperature cold screen and is not contacted with a liquid heat-conducting medium, the heat-conducting medium is converted into low-temperature liquid through the low-temperature heat exchanger of the refrigerator, the liquid storage container is kept at low temperature, the superconducting coil is kept at low temperature through the heat-conducting line, and the superconducting coil does not need to be immersed in the liquid heat-conducting medium, so that the using amount of the liquid heat-conducting medium can be reduced.
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 the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a superconducting magnet cryogenic heat exchange device according to a specific embodiment of the present invention.
The figure includes:
the device comprises a liquid storage container 1, a gas storage tank 2, a pipeline 21, a gas supplementing opening 22, a low-temperature cold screen 3, a normal-temperature container 4, a refrigerator 5, a low-temperature heat exchanger 51, a heat exchange base 52, a superconducting coil 6, a heat conducting wire 7 and a heat conducting flange 71.
Detailed Description
The core of the invention is to provide a superconducting magnet low-temperature heat exchange device, which enables a superconducting coil to keep low temperature in a heat conduction mode and reduces the consumption of liquid helium required by maintaining a superconducting low-temperature environment.
In order to make those skilled in the art better understand the technical solution of the present invention, the superconducting magnet cryogenic heat exchange device of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of a superconducting magnet cryogenic heat exchange device according to a specific embodiment of the present invention; the superconducting magnet low-temperature heat exchange device comprises a liquid storage container 1, a gas storage tank 2, a low-temperature cold screen 3, a normal-temperature container 4, a refrigerator 5 and the like, wherein the low-temperature cold screen 3 can be a 50K cold screen, and the normal-temperature container 4 can be a 300K container; the liquid storage container 1 is used for storing liquid heat-conducting media, the gas storage tank 2 is used for storing gaseous heat-conducting media, different phase states exist when the temperature of the heat-conducting media changes, the liquid state is realized at low temperature, and the gaseous state is realized at high temperature.
The liquid storage container 1 is communicated with the air storage tank 2 through a pipeline 21, and when the heat-conducting medium is gaseous, the heat-conducting medium can flow between the liquid storage container 1 and the air storage tank 2 and enters the air storage tank 2 from the liquid storage container 1 or enters the liquid storage container 1 from the air storage tank 2.
The refrigerator 5 cools the heat-conducting medium through a low-temperature heat exchanger 51 arranged in the liquid storage container 1, so that the heat-conducting medium is liquefied and falls into the liquid storage container 1; mutual heat conduction is connected between refrigerator 5 and the cryogenic heat exchanger 51, and refrigerator 5 can produce cold volume, produces the heat exchange through cryogenic heat exchanger 51 and heat-conducting medium, cools off gaseous heat-conducting medium, and gaseous heat-conducting medium and cryogenic heat exchanger 51 produce the heat exchange after the temperature reduces and forms liquid, fall the bottom of stock solution container 1. The cryogenic heat exchanger 51 extends into the liquid storage container 1, the gaseous heat-conducting medium flows in from a gap between the cryogenic heat exchanger 51 and the liquid storage container 1, and the gaseous heat-conducting medium is liquefied from a gaseous state to a liquid state when heat exchange is generated through the cryogenic heat exchanger 51.
The liquid heat-conducting medium falls to the lower part of the liquid storage container 1, and when the liquid heat-conducting medium absorbs heat conducted by the liquid storage container 1, vaporization is generated, so that the heat can be rapidly conducted out, and the lower part of the liquid storage container 1 is kept in a low-temperature state.
A superconducting coil 6 is arranged in the low-temperature cold screen 3, the lower part of the liquid storage container 1 and the superconducting coil 6 are both positioned in the low-temperature cold screen 3, the low-temperature cold screen 3 plays a role in heat insulation, and the inner cavity of the low-temperature cold screen 3 keeps low temperature; heat is transferred between the superconducting coil 6 and the liquid storage container 1 through the heat conducting wire 7.
The low-temperature cold screen 3 and the liquid storage container 1 are both arranged in the normal-temperature container 4, the normal-temperature container 4 is used for keeping the internal structure to be insulated from the outside, and the outside of the normal-temperature container 4 is the room temperature. The pipeline 21 is led into the normal temperature container 4 from the outside, and exchanges heat after entering the liquid storage container 1 arranged in the normal temperature container 4, and the liquid is liquefied into a liquid state.
Be in the cold screen 3 of low temperature and the room temperature container 4 and be the vacuum that keeps, transfer the heat to stock solution container 1 through heat conduction line 7 during superconducting coil 6 produces the heat, heat conduction line 7 has good heat conduction effect, the bottom of stock solution container 1 has good heat conduction effect, can transfer the liquid heat-conducting medium of inside with the heat fast, heat-conducting medium vaporizes after absorbing the heat and rises for the gaseous state, receive the cold liquid that becomes again when reacing low temperature heat exchanger 51, how the circulation keeps dynamic balance.
Because the superconducting magnet low-temperature heat exchange device provided by the invention enables the superconducting coil 6 to keep low temperature in a heat transfer mode, the superconducting coil 6 does not need to be immersed in a liquid heat-conducting medium, and the heat-conducting medium and the superconducting coil 6 are kept isolated from each other, compared with the traditional cooling mode of immersing the superconducting coil in a medium, the superconducting magnet low-temperature heat exchange device can effectively reduce the using amount of the heat-conducting medium, the superconducting coil 6 can keep a low-temperature environment only by a small amount of the heat-conducting medium, the heat exchange efficiency in the cooling process is improved, and the cooling; because the heat-conducting medium is not in contact with the superconducting coil, the speed of replacing or supplementing the heat-conducting medium is higher, and the safe time that the magnet does not lose the power supply during running can be effectively prolonged.
On the basis of the scheme, the heat conducting wire 7 is connected with the bottom of the liquid storage container 1 through the heat conducting flange 71, the heat conducting wire 7 is connected to the heat conducting flange 71, the heat conducting wire 7 directly generates heat exchange with the heat conducting flange 71, and the heat conducting wire 7 can be welded on the heat conducting flange 71 to reduce contact thermal resistance; the contact position between the heat conduction flange 71 and the liquid storage container 1 is respectively provided with a heat radiation fin for increasing the heat exchange area, and as shown in fig. 1, the bottom surface of the liquid storage container 1 and the heat conduction flange 71 are respectively provided with a tooth-shaped staggered complementary structure, so that the heat conduction area is effectively increased relative to plane contact, and heat is more quickly conducted between the heat conduction flange 71 and the liquid storage container 1. The shapes of the heat transfer flange 71 and the heat sink provided on the liquid storage container 1 are not particularly limited as long as the heat exchange area can be increased.
Specifically, the heat conductivity coefficient of the heat conducting flange 71 in the invention is not lower than that of stainless steel, for example, the heat conducting flange can be made of copper and other materials, so that heat can be timely conducted out; the liquid storage container 1 and the heat conduction flange 71 are welded and fixed, and thermal contact resistance between the liquid storage container and the heat conduction flange is reduced.
The heat conducting wire 7 in the invention is preferably made of soft copper wire, and heat is conducted between the heat conducting flange 71 and the liquid storage container 1 through a plurality of soft copper wires.
Preferably, the air supplementing opening 22 is arranged on the air storage tank 2, gaseous heat-conducting medium is supplemented into the air storage tank 2 through the air supplementing opening 22, and the air supplementing opening 22 is of a tubular structure and is welded on the air storage tank 2.
On the basis of any one of the technical schemes and the mutual combination thereof, one or more of helium, nitrogen, argon and neon are stored in the liquid storage container 1 and the gas storage tank 2, namely the heat-conducting medium can be one or more of helium, nitrogen, argon and neon, if only one is a single-phase gas working medium, two or more are mixed gas working mediums; for the mixed gas working medium, different gases have different boiling points, the heat exchange effect of the gases in the phase change process is optimal, and the environment temperature of the superconducting coil 6 can be better controlled by adopting the gases with different boiling points, such as 77K-65K, 25K-30K, 4.2K-5.2K and the like.
As shown in figure 1, the heat exchange seat 52 for heat conduction is arranged at the contact position of the low-temperature cold shield 3 and the liquid storage container 1, and the heat exchange seat 52 is annularly arranged, so that the interface of the low-temperature cold shield 3 keeps low temperature, and the heat exchange between the inside and the outside of the low-temperature cold shield 3 is reduced.
Preferably, as shown in fig. 1, the low-temperature cold shield 3 and the normal-temperature container 4 in the invention are both of boss structures with small tops and large bottoms, the cross section is generally in a shape like a Chinese character 'tu', the superconducting coil 6 is positioned at the large bottom of the lower part of the low-temperature cold shield 3, the liquid storage container 1 is positioned at the small top of the upper part of the low-temperature cold shield 3, the gap space between the liquid storage container 1 and the low-temperature cold shield 3 is small, the gas is convenient for heat exchange when passing through, and the structure with large bottom and small top can reduce the volume of the whole inner cavity of the low-temperature cold shield 3; the low-temperature cold screen 3 is positioned at the large bottom of the lower part of the normal-temperature container 4, the refrigerator 5 is positioned at the small top of the upper part of the normal-temperature container 4, and the structure of the normal-temperature container 4 and the low-temperature cold screen 3 have similar effects.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The superconducting magnet low-temperature heat exchange device is characterized by comprising a liquid storage container (1), a gas storage tank (2), a low-temperature cold screen (3), a normal-temperature container (4) and a refrigerator (5), wherein the liquid storage container (1) is communicated with the gas storage tank (2) through a pipeline (21);
the refrigerator (5) cools heat-conducting medium through a low-temperature heat exchanger (51) arranged in the liquid storage container (1), so that the heat-conducting medium is liquefied and falls into the liquid storage container (1);
a superconducting coil (6) is arranged in the low-temperature cold shield (3), and heat is transferred between the superconducting coil (6) and the liquid storage container (1) through a heat conducting wire (7).
2. A superconducting magnet cryogenic heat exchange device according to claim 1, wherein the heat conducting wire (7) is connected with the bottom of the liquid storage container (1) through a heat conducting flange (71); and radiating fins for increasing the heat exchange area are respectively arranged at the contact positions between the heat conduction flange (71) and the liquid storage container (1).
3. A superconducting magnet cryothermal exchange apparatus according to claim 2, wherein the thermal conductivity of the heat conducting flange (71) is not less than stainless steel; the liquid storage container (1) and the heat conduction flange (71) are fixed in a welding mode.
4. A superconducting magnet cryothermal exchange device according to claim 3, wherein the thermally conductive wire (7) is a soft copper wire.
5. The superconducting magnet cryogenic heat exchange device according to claim 1, wherein an air supplement port (22) is arranged on the air storage tank (2), and a heat conducting medium is supplemented into the air storage tank (2) through the air supplement port (22).
6. A superconducting magnet cryothermal apparatus according to any of claims 1 to 5, wherein one or more of helium, nitrogen, argon and neon are stored in the liquid storage container (1) and the gas storage tank (2).
7. A superconducting magnet cryogenic heat exchange device according to claim 6, wherein a heat exchange seat (52) for heat conduction is arranged at the contact position of the cryogenic cold shield (3) and the liquid storage container (1).
8. The superconducting magnet cryogenic heat exchange device according to claim 6, wherein the cryogenic cold shield (3) and the normal temperature container (4) are of boss structures with small tops and large bottoms, the superconducting coil (6) is located at the large bottom of the lower portion of the cryogenic cold shield (3), and the liquid storage container (1) is located at the small top of the upper portion of the cryogenic cold shield (3); the low-temperature cold screen (3) is positioned at the bottom of the lower part of the normal-temperature container (4) and the refrigerator (5) is positioned at the top of the upper part of the normal-temperature container (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011264001.9A CN112271051A (en) | 2020-11-12 | 2020-11-12 | Superconducting magnet low-temperature heat exchange device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011264001.9A CN112271051A (en) | 2020-11-12 | 2020-11-12 | Superconducting magnet low-temperature heat exchange device |
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| CN112271051A true CN112271051A (en) | 2021-01-26 |
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| CN202011264001.9A Pending CN112271051A (en) | 2020-11-12 | 2020-11-12 | Superconducting magnet low-temperature heat exchange device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324345A (en) * | 2021-06-18 | 2021-08-31 | 中国科学院兰州化学物理研究所 | 1.5K ultralow temperature implementation system and method of liquid helium-free low-temperature system |
| CN113903541A (en) * | 2021-11-04 | 2022-01-07 | 中国原子能科学研究院 | Large high-temperature superconducting magnetic system based on small refrigerator and temperature control method |
| WO2024087532A1 (en) * | 2022-10-25 | 2024-05-02 | 南通中集能源装备有限公司 | Pressurization device for cryogenic container, and cryogenic container |
-
2020
- 2020-11-12 CN CN202011264001.9A patent/CN112271051A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324345A (en) * | 2021-06-18 | 2021-08-31 | 中国科学院兰州化学物理研究所 | 1.5K ultralow temperature implementation system and method of liquid helium-free low-temperature system |
| CN113903541A (en) * | 2021-11-04 | 2022-01-07 | 中国原子能科学研究院 | Large high-temperature superconducting magnetic system based on small refrigerator and temperature control method |
| CN113903541B (en) * | 2021-11-04 | 2022-06-28 | 中国原子能科学研究院 | Large high-temperature superconducting magnetic system based on small refrigerator and temperature control method |
| WO2024087532A1 (en) * | 2022-10-25 | 2024-05-02 | 南通中集能源装备有限公司 | Pressurization device for cryogenic container, and cryogenic container |
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Address after: 315300 No. 427, Gaoke Avenue, Cixi High-tech Industrial Development Zone, Ningbo City, Zhejiang Province Applicant after: Ningbo Jianxin Superconducting Technology Co.,Ltd. Address before: 315301 No.427, Gaoke Avenue, Cixi hi tech Industrial Development Zone, Ningbo City, Zhejiang Province Applicant before: NINGBO JANSEN NMR TECHNOLOGY Co.,Ltd. |