CN201749756U - Refrigeration system used for superconducting magnets - Google Patents
Refrigeration system used for superconducting magnets Download PDFInfo
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- CN201749756U CN201749756U CN2010202411532U CN201020241153U CN201749756U CN 201749756 U CN201749756 U CN 201749756U CN 2010202411532 U CN2010202411532 U CN 2010202411532U CN 201020241153 U CN201020241153 U CN 201020241153U CN 201749756 U CN201749756 U CN 201749756U
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- convex platform
- heat exchanger
- cold head
- refrigerating system
- side pipe
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Abstract
The utility model discloses a refrigeration system used for superconducting magnets, which comprises a heat exchanger, a side pipe arranged on the heat exchanger, and a cold head arranged in the side pipe, wherein a lower lug boss is arranged on the cold head, a clearance is formed between the lower lug boss and the heat exchanger, and the clearance allows coolant material in the refrigeration system, which evaporates after being heated, to pass through. The refrigeration system can run in case of current failure of a refrigeration system during transportation and the like, refrigeration can be achieved without additional refrigeration facilities, the manufacturing cost is reduced, the refrigeration system is simpler and more convenient to operate, and the refrigeration effect is good.
Description
Technical field
The utility model relates to a kind of refrigerating system that is used for superconducting magnet, in particular, relates to a kind ofly in the outage transportation, is used for the refrigerating system of superconducting magnet.
Background technology
Superconductor is owing to the zero resistance characteristic under its ultralow temperature obtains using more and more widely, and common purposes comprises transmission of electricity and makes large-scale magnet etc. at present.But,, superconductor need be cooled to extremely low temperature in order to enter superconducting state.In MR imaging apparatus, just used superconducting magnet system, be immersed in as in the cooling agents such as liquid helium by the electromagnet that coil is constituted, to reach the needed ultralow temperature of superconduction (4.2K).Disturb for the heat that reduces outer bound pair liquid helium, usually a heat radiation screening and vacuum (-tight) housing can be set outside the container that holds liquid helium and electromagnet.But, owing to can not stop heat conduction fully on the structure, thereby cooling agent can absorb the extraneous heat that imports into by evaporation, thereby keeps stable superconduction environment.Existing MR imaging apparatus in order to reduce the evaporation of cooling agent, can be provided with cold head and compressor in the course of the work usually, and heat radiation screening is cooled off.
In the transportation of MR imaging apparatus, because entire equipment is in off-position, can't power to cold head, thereby can't freeze to heat radiation screening, cause the temperature of heat radiation screening to raise, correspondingly raise by the thermal radiation of heat radiation screening to container, thereby the evaporation capacity that causes cooling agent increases, the expensive cooling agent of loss makes the equipment cost of transportation increase.In very long sea-freight, this problem is particularly evident.For example, according to statistics, in about one month marine transportation, nearly 1000～1500 liters of liquid heliums evaporation.
In order to solve this technical problem, Chinese patent application 200810170315.5 has been put down in writing a kind of cryostat, comprise that one remains on the cryogen vessel in the outer vacuum container, described cryogen vessel is provided with an emission path that allows refrigerant gas to overflow from described cryogen vessel, described cryostat comprises that further one is inserted in the thermal radiation between described cryogen vessel and the described outer vacuum container, described emission path is configured so that guide the refrigerant gas of effusion by a pipeline, and described pipeline forms the part of thermal radiation; Described pipeline is the connecting tube that comprises at least one hole and at least two flanges, and described thermal radiation is made of at least two sections, and each first and second section is attached on the respective flanges of described connecting tube.In transit, refrigerant evaporates and when escaping from above-mentioned hole, it absorbs heat from pipeline makes the heat radiation screening cooling again.
Though such scheme can reduce the temperature of heat radiation screening to a certain extent in transportation, still there is the possibility of further simplifying in its structure more complicated.
The utility model content
The purpose of this utility model provides a kind of refrigerating system that is used for superconducting magnet, this refrigerating system can not operate when superconducting magnet is switched on work, especially in transportation, operate, realize cooling, to reduce loss as the liquid coolant of costlinesses such as helium to heat radiation screening.
Another purpose of the present utility model provides a kind of refrigerating system that is used for superconducting magnet, and it need not to be provided with extra device, can realize the cooling to heat radiation screening, and manufacturing cost reduces, and operates more easyly, and refrigeration is better.
The utility model provides the refrigerating system that is used for superconducting magnet, comprise a heat exchanger, a side pipe and a cold head that is arranged in the side pipe that is arranged on the heat exchanger, wherein cold head is provided with a lower convex platform, can produce a gap between lower convex platform and the heat exchanger, but passed by the cooling agent of thermal evaporation in this gap heating/refrigerating system.
Another schematic execution mode in the refrigerating system that is used for superconducting magnet, also be provided with a convex platform on the cold head, also be provided with a flange on the side pipe, described convex platform is connected via a plurality of bolts with described flange, and convex platform can separate with flange under the drive of these bolts, and then forms the described gap between lower convex platform and the heat exchanger.
At the another kind of schematically execution mode of the refrigerating system that is used for superconducting magnet, heat exchanger can be a copper billet, and side pipe then can be made by stainless steel material.
At also a kind of schematic execution mode of the refrigerating system that is used for superconducting magnet, the cooling agent in the refrigerating system is liquid helium, and in this case, when the gap between lower convex platform and the heat exchanger was 3～10mm, refrigeration was especially good.
The refrigerating system that the utility model provides, forming 3～10mm gap that supplies the gas after cooling agent (particularly liquid helium) evaporates to pass between cold head and the heat exchanger, gas is when passing this gap, the sensible heat characteristic of utilizing self is by the heat in the shielding of heat exchanger (particularly copper billet) absorptive thermal radiation, reduce the heat that imports on cooling agent and the superconducting magnet indirectly, finally reduced the evaporation capacity of cooling agent.
According to above-mentioned refrigerating system, the state when only needing with respect to cold head energising work (this moment, cold head and heat exchanger were close together) upwards promotes certain distance with cold head, and cold head is separated with heat exchanger, just can form above-mentioned gap.This refrigerating system that is used for superconducting magnet that the utility model provides need not to take extra refrigeration measure (tube connector and hole etc. for example are set) on heat radiation screening, can reach refrigeration, has reduced manufacturing cost, has simplified operating process.
In addition, in the refrigerating system that the utility model provides, cold head is installed in the side pipe of being made by stainless steel material, side pipe and cold head utilize bolt simply to be connected and fixed again, make whole operation more easy.
Description of drawings
The following drawings is only done the utility model and is schematically illustrated and explain, does not limit scope of the present utility model, wherein:
Fig. 1 is the structural representation horse stable according to the refrigerating system that is used for superconducting magnet of a kind of exemplary embodiment of the utility model;
Fig. 2 is the partial schematic sectional view of the refrigerating system that is used for superconducting magnet shown in Figure 1; With
Fig. 3 is the partial schematic sectional view of another state of refrigerating system that is used for superconducting magnet shown in Figure 1.
Embodiment
Understand for technical characterictic, purpose and effect to utility model have more clearly, now contrast description of drawings embodiment of the present utility model, identical label is represented identical part in each figure.In this article, " one " not only represents " only this ", also can represent the situation of " more than ".In this article, " on ", D score etc. only is used to represent the position relation between the relevant portion, and non-limiting their absolute position.Hereinafter the refrigerating system that is used for superconducting magnet of the present utility model is described with reference to Fig. 1, Fig. 2 and Fig. 3, wherein Fig. 1 is the structural representation according to the refrigerating system that is used for superconducting magnet of a kind of exemplary embodiment of the utility model, and Fig. 2 and Fig. 3 are the partial schematic sectional view of the refrigerating system that is used for superconducting magnet shown in Figure 1.
As shown in the figure, have as cooling agents such as liquid helium 24 in the container 20, superconducting magnet 22 is immersed in the cooling agent 24, though schematically shown two superconducting magnets 22 among the figure, its number can be decided according to actual conditions, also can be one or more than two.Container 20 peripheries are imported in the container 20 from the external world to stop heat round heat radiation screening 30 and vacuum (-tight) housing 40.A heat exchanger 112 is set on heat radiation screening 30, side pipe 114 is arranged on the heat exchanger 112, be provided with a cold head 116 in the side pipe 114, cold head 116 is provided with a lower convex platform 117, under the operating state of cold head 116, the lower convex platform 117 of cold head 116 is seated on the heat exchanger 112 and closely contacts (referring to Fig. 3) with it.When cold head 116 is in off-position, cold head 116 is liftable, form a gap 113 between the lower convex platform 117 of cold head 116 and heat exchanger on the other side 112, (being specially in the container 20) cooling agent that is subjected to thermal evaporation in the refrigerating system can pass in the gap 113 thus along direction shown in the arrow among Fig. 2.
In exemplary embodiment shown in Figure 2, also be provided with a convex platform 118 on the cold head 116, also have a flange 119 on the side pipe 114, bolt 115 connects the convex platform 118 of cold head 116 and the flange 119 of side pipe 114, though only schematically showed a bolt on the figure, but in real work,, often to arrange a plurality of bolts in order to satisfy requirement of engineering.
As shown in Figure 3, when cold head 116 is in running order, screw bolt 115, the convex platform 118 of cold head 116 is pressed on the flange 119 of side pipe 114, like this, cold head 116 just is fastened in the side pipe 114 by above-mentioned.Simultaneously, the lower convex platform 117 of cold head 116 is resisted against on the heat exchanger 112, does not have gap 113, guarantees cold head 116 energy operate as normal, with heat of cooling emission shield 30.
When cold head 116 is not switched on, rotating bolt 115, with cold head 116 lifting one segment distance upwards, by bolt 115 convex platform 118 of cold head 116 is fixed with the flange 119 maintenance certain distances of side pipe 114 more subsequently, thereby the lower convex platform 117 that drives cold head 116 has also left heat exchanger 112, but the gap 113 that the cooling agent that is subjected to thermal evaporation in the formation heating/refrigerating system passes through, as shown in Figure 2.Bolt 115 can be connected with convex platform 118, thereby driving convex platform 118 separates with flange 119, for example, bolt 115 with the perpendicular plane of cold head moving direction on have a projection, a plurality of projection or a circle projection (not shown), described projection is stuck in the convex platform 118 or is stuck in convex platform 118 belows, when bolt 115 moves up (the top here, below please refer to Fig. 2), drive convex platform 118 by projection and move upward, and separate with flange 119.
A kind of schematic mode that below only provides cold head 116 to lift, it will be appreciated by those skilled in the art that, also can select other any suitable modes for use, realize of the separation of the lower convex platform 117 of cold head 116, can form gap 113 equally with respect to heat exchanger 112.
Like this, in transportation, when the liquid coolant in the container 20 (referring to Fig. 1) evaporated, the coolant gas that evaporation forms will flow along the direction of arrow indication among Fig. 2.Along with gas passes gap 113, the GAS ABSORPTION of the heat exchanger 112 of flowing through the heat on the heat radiation screening 30, cause gas self temperature to raise, and heat of cooling radiation shield 30.At this moment, the heat that enters container 20 from heat radiation screening 30 also reduces thereupon, has reduced the evaporation capacity of cooling agent.Specifically, in transportation, the cooling agent of evaporation can pass through gap 113 and the service tower 50 between side pipe 114, lower convex platform 117 and the heat exchanger 112, flow to relief valve 70 (referring to Fig. 1) along pipeline 60.
Because stainless steel has toughness and corrosion resistance preferably, therefore in a kind of schematic execution mode, side pipe 114 preferably can be made by stainless steel material.
In addition, in order to guarantee good thermal conductivity, in a kind of schematic execution mode, heat exchanger 112 can be made by copper billet, and makes it and heat radiation screening 30 abundant thermo-contacts.
Experimental results show that, adopting liquid helium is in the refrigerating system of superconducting magnet of cooling agent, if cold head is in non operating state, when the lower convex platform 117 of cold head 116 and the gap between the heat exchanger 112 113 are 3～10mm, the circulation of balance helium and outer hot importing into well, make refrigerating system play one's part to the full, reach good refrigeration.
In sum, adopt refrigerating system of the present utility model, need not to take special refrigeration measure, only needing provides gap 113 between the lower convex platform 117 of cold head 116 and heat exchanger 112, cooling agent for evaporation passes and get final product, has therefore reduced the cost of design and manufacturing, is simpler and more convenient to operate.
In addition, gap 113 can utilize bolt 115 to drive upwards lifting certain distance and forming of cold heads 116, need not to use other optional equipments, and is also more easy in the operation.
Above listed a series of detailed description only is specifying at feasibility embodiment of the present utility model; they are not usefulness-limiting protection range of the present utility model, allly do not break away from equivalent embodiment or the change that the utility model skill spirit done and all should be included within the protection range of the present utility model.
Claims (7)
1. a refrigerating system that is used for superconducting magnet comprises: a heat exchanger, a side pipe and a cold head that is arranged in the described side pipe that is arranged on the described heat exchanger;
It is characterized in that described cold head is provided with a lower convex platform, can produce a gap between this lower convex platform and the described heat exchanger, this gap is passed for the cooling agent that evaporates in the described refrigerating system.
2. refrigerating system as claimed in claim 1 is characterized in that,
Also be provided with a convex platform on the described cold head;
Described side pipe is provided with a flange;
Described convex platform is connected via a plurality of bolts with described flange, and described convex platform can separate with described flange, and then forms the described gap between described lower convex platform and the described heat exchanger.
3. refrigerating system as claimed in claim 2 is characterized in that, described bolt and described convex platform are connected, and separates with described flange to drive described convex platform.
4. as claim 2 or 3 described refrigerating systems, it is characterized in that described convex platform keeps certain distance to fix by bolt with described flange when separating.
5. refrigerating system as claimed in claim 1 is characterized in that described heat exchanger is a copper billet.
6. refrigerating system as claimed in claim 1 is characterized in that described side pipe is made by stainless steel material.
7. refrigerating system as claimed in claim 1 is characterized in that, described gap is 3～10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202411532U CN201749756U (en) | 2010-06-29 | 2010-06-29 | Refrigeration system used for superconducting magnets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202411532U CN201749756U (en) | 2010-06-29 | 2010-06-29 | Refrigeration system used for superconducting magnets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201749756U true CN201749756U (en) | 2011-02-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202411532U Expired - Fee Related CN201749756U (en) | 2010-06-29 | 2010-06-29 | Refrigeration system used for superconducting magnets |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201749756U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108022711A (en) * | 2018-01-02 | 2018-05-11 | 中国科学院电工研究所 | A kind of intelligence is without liquid helium magnetic resonance whole body imaging superconducting magnet system |
| CN108291949A (en) * | 2015-11-25 | 2018-07-17 | 皇家飞利浦有限公司 | Magnetic resonance imaging (MRI) equipment and the cryostat for MRI machine |
-
2010
- 2010-06-29 CN CN2010202411532U patent/CN201749756U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108291949A (en) * | 2015-11-25 | 2018-07-17 | 皇家飞利浦有限公司 | Magnetic resonance imaging (MRI) equipment and the cryostat for MRI machine |
| CN108022711A (en) * | 2018-01-02 | 2018-05-11 | 中国科学院电工研究所 | A kind of intelligence is without liquid helium magnetic resonance whole body imaging superconducting magnet system |
| US11802924B2 (en) | 2018-01-02 | 2023-10-31 | Institute Of Electrical Engineering, Chinese Academy Of Sciences | Magnetic resonance imaging superconducting magnet system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SIEMENS (SHENZHEN) MAGNETIC RESONANCE CO., LTD. Free format text: FORMER NAME: SIEMENS MINDIT (SHENZHEN) MAGNETIC RESONANCE LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518057 two SIEMENS magnetic resonance garden, central high tech Zone, Guangdong, Shenzhen Patentee after: Siemens (Shenzhen) Magnetic Resonance Ltd. Address before: 518057 two SIEMENS magnetic resonance garden, central high tech Zone, Guangdong, Shenzhen Patentee before: Siemens Mindit (Shenzhen) Magnetic Resonance Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110216 Termination date: 20170629 |