CN104700976B - Cryostat and its manufacture method, cooling means, magnetic resonance system - Google Patents
Cryostat and its manufacture method, cooling means, magnetic resonance system Download PDFInfo
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- CN104700976B CN104700976B CN201510054244.2A CN201510054244A CN104700976B CN 104700976 B CN104700976 B CN 104700976B CN 201510054244 A CN201510054244 A CN 201510054244A CN 104700976 B CN104700976 B CN 104700976B
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- siphunculus
- conduit
- tank body
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/381—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
- G01R33/3815—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets with superconducting coils, e.g. power supply therefor
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Abstract
The cryostat that the present invention provides, tank body including the first housing and for accommodating cooling medium, described first shell body is located at the outside of described tank body, it is the first cavity between described first housing and tank body, described cryostat also includes siphunculus, conduit, described conduit connects described siphunculus and described tank body, and described siphunculus is fixed on the first housing, and the section tubular wall of siphunculus is the corresponding ingredient of described first housing.Compared with prior art, the cryostat that the technical program provides, wherein screen layer has single heat exchange cavity；During magnet pre-cooling, by injecting the cooling medium such as liquid helium or liquid nitrogen toward in this cavity, screen layer temperature-fall period can be dramatically speeded up, save pre-cooling cost；During magnet long-distance transport, by the cooling medium such as injection liquid nitrogen toward in screen layer cavity；Or the cold helium that will evaporate in liquid helium tank, it is passed through screen layer cavity, the temperature-rise period of screen layer can be slowed down, extend haulage time.
Description
Technical field
The present invention relates to magnetic resonance arts, more particularly, to a kind of magnetic resonance system cryostat and its manufacture method,
Cooling means.
Background technology
In mr imaging technique, traditional superconducting magnet cools down superconducting coil with liquid helium, due to the gasification of liquid helium
Latent heat very little, therefore need to leak the cryostat of hot very little to contain liquid helium, to reduce the loss of liquid helium.Fig. 1 is traditional superconduction
Magnet cryostat structure, liquid helium 1 is contained in internal layer liquid helium tank 2, is disposed with the thermal shield 3 of radioprotective outside liquid helium tank 2,
Liquid helium tank 2 and screen layer 3 pass through suspension 6 and are lifted on outer layer vacuum cylinder 4.Screen layer 3 and liquid helium tank 2 are connected respectively to refrigeration machine
5 one-level 7 (temperature is 50K) and two grade of 8 (temperature is 4.2K) refrigeration extremely go up.
Because the Temperature Distribution of screen layer 3 directly affects it, heat is leaked to the radiation of internal layer liquid helium tank 2, during system pre-cooling, screen
Cover layer 3 and should be decreased as quickly as possible 50K；During normal work, temperature should be as low as possible everywhere for screen layer；And magnet travel position
Under, because refrigeration machine 5 cannot work, at this moment then should ensure that screen layer temperature must not raise too fast.
But in fact, leak heat, the suspension 6 of screen layer 3 and outer vacuum cylinder 4 to reduce the outside conduction of heat to screen layer 3
Generally slim-lined construction, it is also restricted with the heat-conducting area of refrigeration machine 5, when which results in magnet pre-cooling, screen layer 3 cold
But the refrigeration pole 7 that refrigeration machine can only be relied on cools down, and the general all very littles of this grade of refrigeration work consumption are so that pre- cold efficiency is very low, pre-cooling
Time is long, and the liquid helium of needs is many, high cost.
And during magnet transport, because refrigeration machine 5 quits work, the refrigeration pole 7 originally playing refrigeration can become heat conduction
" bridge ", so that screen layer temperature rises rapidly, it significantly increases to the radiation of liquid helium tank 2, accelerates the volatilization of liquid helium, limits
Haulage time and distance.
In normal operating conditions, screen layer 3 away from refrigeration pole 7 side (lower right in Fig. 1), temperature can substantially surpass
Cross the temperature (50K) of refrigeration pole 7, this also can increase the heat radiation to liquid helium tank 2, " zero evaporation " performance of impact system simultaneously.
As shown in Fig. 2 US 4721934B illustrates a kind of method of common reduction screen layer 3 temperature, that is, in screen layer
3 outer layer is wound around the good copper pipe 9 of heat conduction for one week, significantly can be added by injection cold medium (as liquid nitrogen or liquid helium) into copper pipe 9
The cooling precooling process of fast screen layer 3；Simultaneously in transport, the cold helium of evaporation inside liquid helium tank can be passed through copper pipe, slow down
Refrigeration machine 5 quit work during screen layer 3 temperature-rise period, extend magnet haulage time.But the refrigeration that this scheme will obtain
Effect, need to arrange the copper pipe of complexity, and the thermal contact conductance that the heat exchange between copper pipe 9 and screen layer 3 simultaneously mainly passes through both is complete
Become, heat exchange area is little, efficiency is often subject to process conditions.Therefore, it is necessary to propose a kind of in hgher efficiency low of screen layer pre-cooling
Warm keeper.
Content of the invention
In order to solve the problems, such as that in prior art, magnetic resonance system screen layer precooling effect is poor, the invention provides a kind of screen
Cover layer pre-cooling cryostat in hgher efficiency.
A kind of cryostat, the tank body including the first housing and for accommodating cooling medium, described first shell position
It is the first cavity between the outside of described tank body, described first housing and tank body, described cryostat also includes siphunculus, leads
Pipe, described conduit connects described siphunculus and described tank body, and described siphunculus is fixed on the first housing, and the section tubular wall of siphunculus is institute
State the corresponding ingredient of the first housing.
Preferably, described siphunculus at least part-structure is located at the lower section of the horizontal central plane of described first housing.
Preferably, described cryostat also includes the second housing, and described second shell body is located at the outside of the first housing, and
It is the second cavity between described first housing, the second housing.
Preferably, described siphunculus is located between described first cavity and the second cavity.
Preferably, described tank body is provided with through hole, described siphunculus is arranged in described through hole, and the two ends of siphunculus and the
One housings close is fixed.
Preferably, described conduit includes the first conduit, and one end of described first conduit is connected with described tank interior, described
The other end of the first conduit connects with inside described siphunculus.
Preferably, described conduit also includes the second conduit, and one end of described second conduit connects with inside described siphunculus, institute
State the second conduit other end and described cryostat ft connection.
Preferably, the diameter with diameter greater than conduit of described siphunculus.
Preferably, also include refrigeration machine, position more than tank body cooling medium liquid level for the described refrigeration machine and tank interior
Connection.
Preferably, it is provided with heat exchanger fin in described siphunculus.
Preferably, described tank body is provided with multiple through holes, in each through hole, is provided with siphunculus, all described siphunculus connections
Form an intercommunication space.
Preferably, the two ends in the intercommunication space that described siphunculus is constituted pass through described conduit respectively with described tank body and described low
Warm keeper ft connection.
Present invention also offers a kind of cryostat, described cryostat includes the tank for accommodating cooling medium
Body, middle shield and outer layer vacuum cylinder, are vacuum chamber between described outer layer vacuum cylinder and described tank body, described intershield
Layer is located between described tank body and described outer layer vacuum cylinder, and described cryostat also includes siphunculus, conduit, described conduit and institute
State siphunculus, tank body connection, described siphunculus is fixed on the first housing, and the section tubular wall of siphunculus is the respective sets of described first housing
Become part.
Preferably, described conduit includes the first conduit, the second conduit, one end of described first conduit and described tank interior
Connection, the other end of described first conduit connects with inside described siphunculus；Inside one end of described second conduit and described siphunculus
Connection, the other end of described second conduit and described cryostat ft connection.
Present invention also offers a kind of magnetic resonance system, described magnetic resonance system is using the low temperature guarantor described in any of the above-described
Holder, described magnetic resonance system also includes：Be arranged at the superconducting coil in cryostat, described superconducting coil be used for providing into
The main field of row nuclear magnetic resonance；
Gradient system, is used for being produced as magnetic resonance signal carrying out sterically defined gradient magnetic；Radio system, for launching
Radio-frequency pulse and reception magnetic resonance signal；Control system, for controlling described gradient system and radio system to carry out magnetic altogether
Shake scanning.
The present invention also provides a kind of manufacture method of cryostat, and described cryostat includes the first housing and use
In the tank body accommodating cooling medium, described first housing body is located at the outside of described tank body, and described cryostat also includes leading to
Pipe, conduit, described siphunculus includes siphunculus body and siphunculus side plate, and described conduit is connected with described siphunculus and tank body, described tank
Body includes front head, rear head, inner barrel and outer cylinder body it is characterised in that comprising the following steps：
Through hole is arranged on tank body, described through hole is located between described outer cylinder body, or is located at described front head and rear envelope
Between head, or it is located between described outer cylinder body and described end socket；
Two ports are arranged on described first housing position corresponding with described through hole two ends, described port is first shell
Body end mouth；
Described siphunculus body pass through described first shell ends mouth, be arranged in described through hole, close described siphunculus body with
Described first shell ends mouth；
Close described siphunculus with described siphunculus side plate；
Connect described tank body, siphunculus with described conduit.
Preferably, described conduit includes the first conduit and the second conduit；Described conduit connects tank body, siphunculus and low temperature
Step outside keeper specifically includes：
With one end of described first conduit, through described first housing and tank body, connect with described tank interior, the other end
Through described siphunculus side plate, connect with inside siphunculus；
One end of described second conduit passes through described siphunculus side plate, connects with inside siphunculus, and the other end is protected with described low temperature
Holder ft connection.
The present invention also provides a kind of manufacture method of cryostat, and described cryostat includes the first housing and use
In accommodate cooling medium tank body, described first shell body be located at described tank body outside, described cryostat also include siphunculus,
Conduit, described siphunculus includes siphunculus body and siphunculus side plate, and described conduit is connected with described siphunculus and tank body, described tank body bag
Include front head, rear head, inner barrel and outer cylinder body it is characterised in that step includes：
Through hole is arranged on tank body, described through hole is located between described outer cylinder body, or is located at described front head and rear envelope
Between head, or it is located between described outer cylinder body and end socket；
Two ports are arranged on described first housing position corresponding with described through hole two ends, described port is first shell
Body end mouth；
Close described siphunculus body and described siphunculus side plate obtains the siphunculus of sealing, described siphunculus is passed through described first shell
Body end mouth, is arranged in described through hole, closes described siphunculus and described first shell ends mouth；
Connect described tank body, siphunculus with described conduit.
Present invention also offers a kind of cooling means of cryostat, described cryostat include the first housing and
For accommodating the tank body of cooling medium, described first shell body is located at the outside of described tank body, between described first housing and tank body
For vacuum chamber, described low-temperature (low temperature) vessel also includes siphunculus, conduit, and the section tubular wall of described siphunculus with the appropriate section of the first housing is
Sharing structure, described cooling medium is successively along conduit, siphunculus conveying, and injects in tank body.
Present invention also offers a kind of cooling means of cryostat, described cryostat include the first housing and
For accommodating the tank body of cooling medium, described first housing body is located at the outside of described tank body, described first housing and tank body it
Between be vacuum chamber, described cryostat also includes siphunculus, conduit, and described conduit connects siphunculus and tank body, the pipe of described siphunculus
Wall and first shell body phase merge, and described conduit, siphunculus form the cooling path for cooling down the first housing, make cooling medium along cold
But during the transmission of path, with the first housing directly contact.
Compared with prior art, the cryostat that the technical program provides, wherein screen layer has single heat exchange
Cavity；During magnet pre-cooling, by injecting the cooling medium such as liquid helium or liquid nitrogen toward in this cavity, screen layer can be dramatically speeded up and lowered the temperature
Journey, saves pre-cooling cost；During magnet long-distance transport, by the cooling medium such as injection liquid nitrogen toward in screen layer cavity；Or by tank body
The cold helium inside evaporating, is passed through screen layer cavity, can slow down the temperature-rise period of screen layer, extends haulage time.
Brief description
Fig. 1 is the structural representation of cryostat in prior art；
Fig. 2 is the structural representation of middle shield heat sink in prior art；
Fig. 3 is the vertical section structure schematic diagram of cryostat provided in an embodiment of the present invention and superconducting coil；
Fig. 4 is the schematic cross section that low temperature provided in an embodiment of the present invention keeps；
Fig. 5 is cryostat tank body through hole set-up mode schematic diagram provided in an embodiment of the present invention；
Fig. 6 is cryostat tank body through hole set-up mode schematic diagram provided in an embodiment of the present invention；
The cryostat structural representation that Fig. 7 provides for another embodiment of the present invention；
Fig. 8 is magnetic resonance system figure provided in an embodiment of the present invention；
Fig. 9 is the manufacture method flow chart of cryostat provided in an embodiment of the present invention；
Figure 10 is the manufacture method flow chart of cryostat provided in an embodiment of the present invention.
Specific embodiment
Elaborate a lot of details in order to fully understand the present invention in the following description.But the present invention can be with
Much it is different from alternate manner described here to implement, those skilled in the art can be in the situation without prejudice to intension of the present invention
Under do similar popularization, therefore the present invention is not embodied as being limited by following public.Secondly, the present invention is carried out using schematic diagram
Describe in detail, when describing the embodiment of the present invention in detail, for purposes of illustration only, described schematic diagram is example, its here should not limit this
The scope of invention protection.
As stated in the Background Art, the cryostat in magnetic resonance system, in system pre-cooling, screen layer should be as far as possible
Be reduced to 50K soon, prior art using carrying out pre-cooling by the way of screen layer surface layout copper pipe, between copper pipe and screen layer
Heat exchange mainly completed by both thermal contact conductances, heat exchange area is little, and efficiency is often subject to process conditions, and will obtain
Good refrigeration, need to arrange the copper pipe of complexity.The invention provides a kind of cryostat, coolant is directly connect with screen layer
Touch and carry out heat exchange hence it is evident that improve the effect of pre-cooling.
As shown in figure 3, cryostat 30 is traditional multilamellar cylindrical drum, including outer layer vacuum cylinder 301, described outer layer is true
Empty cylinder 301 is the second housing, middle shield 302, and described middle shield 302 is the first housing, and internal layer tank body 303 is described
Internal layer tank body 303 is the tank body for accommodating cooling medium.Described internal layer tank body 303 is internally provided with superconducting coil, and institute
State superconducting coil to be soaked by coolant.Coolant the most frequently used at present is liquid helium and liquid nitrogen.In traditional superconducting magnet, described super
Loop includes being arranged in the raised external shield coil 304 in two ends and the interior loop 305 near tank body endoporus, described external shield
The diameter of coil 304 is typically much larger than interior loop 305, therefore has between two external shield coils 304 in internal layer liquid helium tank 303
Larger cavity.
As shown in figure 4, arranging through hole 306 on described internal layer tank body 303, described through hole 306 passes through described internal layer tank body
303 empty cavity position.The tube wall of described through hole 306 is a part for described internal layer tank body 303.
Described cryostat also includes siphunculus 307, and described siphunculus 307 is arranged in described through hole 306, and siphunculus 307
Two ends fix with the closing of described middle shield 302, the tube wall of therefore described siphunculus 307 is described middle shield 302
A part.In one embodiment, in the described siphunculus 307 at least level of middle shield 302 described in part-structure position
The lower section in heart face.The shape of described siphunculus 307 is not limited to the shape of in figure, can for bending pipe, increase coolant with
Between screen layer heat exchange area.
Described outer layer vacuum cylinder 301 is vacuum chamber to internal layer tank body 303.Outer layer vacuum cylinder 301 and middle shield
It is the first cavity between 302, described middle shield 301 and described internal layer tank body 303 are the second cavity.In fact, it is described logical
It is located between described first cavity and described second cavity described in pipe 307 position.
As shown in figure 4, described cryostat 30 also includes the first conduit 308 and the second conduit 309.Described first leads
One end of pipe 308, the position more than internal layer tank body 303 cooling-liquid level, through middle shield 302 and internal layer tank body 303,
Connect with internal layer tank body 303 inside；The other end of described first conduit 308 passes through middle shield 302 and siphunculus 307 closing
Position connects with inside siphunculus.
One end of described second conduit 309, the position closed with described siphunculus 307 through described middle shield 302, with
Described siphunculus 307 is internal to be connected；The other end of described second conduit 309 passes through outer layer vacuum cylinder 301, with described cryostat
30 ft connection.
It should be noted that the present invention is arranged at the through hole of internal layer tank body and is arranged at siphunculus within through hole, do not limit
Quantity in embodiment, can have multiple through holes, and each through hole is provided with corresponding siphunculus, and described siphunculus communicates with each other,
Form an intercommunication space, conduit is connected with internal layer tank body and cryostat from the two ends in described intercommunication space respectively.One
Multiple siphunculus are set under a little applied environments or in a through hole.
The technical program is also not necessarily limited to the mode that above-mentioned through hole is horizontally set at internal layer tank body.As shown in figure 5, described through hole
Can also longitudinally disposed (internal layer tank body be by the end socket of in front and back both sides and inside and outside two and the both sides end socket of internal layer tank body between
Cylinder is constituted).If there being multiple through holes, as shown in figure 5, described through hole can be arranged in parallel, the opposing party's aspect, the setting of through hole
Mode needs to consider the position of reinforcement.Described through hole can also arrange and be obliquely installed within outside cylinder and cavity, such as
Shown in Fig. 6, cryostat has two through holes, and two through holes are arranged on the incline direction of outer cylinder body both sides.In other embodiment
In, described through hole setting can be arranged at end socket with one end, and the other end is arranged at cylinder.
Conduit in the technical program is not limited to as shown in Figure 4 two piece conduit, if having multiple through holes and siphunculus, can
To be that each siphunculus is equipped with conduit, form a single cooling circuit.But the quantity of conduit is many, except arrangement complexity
Outward, also add the heat radiation to screen layer, therefore quantity should be moderate.Because siphunculus and conduit work in vacuum environment,
Therefore its mechanical strength at least pressure of 1bar.
In order to increase the heat exchange area of middle shield 302 and coolant, as shown in 4 figures, the diameter of described siphunculus 307
General ratio is larger, more than the diameter of the first conduit 308 or the second conduit 309.As shown in fig. 7, in order to increase and screen layer
Heat exchange area, the present embodiment arranges heat exchanger fin 310 also inside described siphunculus 307.Described heat exchanger fin 310 is fixed on described logical
The inside cavity (remainder of described cryostat does not indicate, consistent with Fig. 4) of pipe 307, accelerates coolant and shielding
The heat exchange of layer.
As shown in figure 4, described cryostat 30, also include refrigeration machine 311, described refrigeration machine 311 is cold in internal layer tank body
But position more than liquid liquid level, through outer layer vacuum cylinder 301, middle shield 302 and internal layer tank body 303, with described internal layer tank
The inside connection of body 303.Described refrigeration machine 311 is arranged at the side of the above position of described internal layer tank body 303 cooling-liquid level.
With reference to Fig. 8, the invention provides magnetic resonance system, described magnetic resonance system is using above-mentioned cryostat 30.
Described magnetic resonance system also includes；It is arranged at the superconducting magnet 40 within described cryostat；Gradient system 41,
Carry out sterically defined gradient magnetic for being produced as magnetic resonance signal；Radio system 42, is used for making checked object magnetic occur altogether
Shake and accept magnetic resonance signal；Control system 43, for controlling described superconducting magnet 40, gradient system 41 and radio system
42 carry out magnetic resonance imaging.
With reference to Fig. 9, present invention also offers the manufacture method of cryostat.Described cryostat includes the first housing
And for accommodating the tank body of cooling medium, described first shell body is located at the outside of described tank body, described cryostat also wraps
Include siphunculus, conduit, described siphunculus includes siphunculus body and siphunculus side plate, described conduit and described siphunculus and tank body interconnecting part.
Described tank body includes front head, rear head, inner barrel and outer cylinder body.The manufacture method of described cryostat includes walking as follows
Suddenly：
Step S20, arranges through hole on tank body, and described through hole is located between tank body outer cylinder body or between end socket or seals
Between head and outer cylinder body.
As described above, described through hole can be arranged at the outer cylinder body of tank body it is also possible to be arranged at the both sides in front and back of tank body
End socket, outer cylinder body can also be arranged between end socket.Regardless of set-up mode, in order to coordinate the shape of outer cylinder body,
The through hole port being arranged at outer cylinder body is groove.
Step S21, arranges two ports, described port on described first housing position corresponding with described through hole two ends
For the first shell ends mouth.
Described first housing, near tank body, arranges two ports corresponding with through hole two ends on described first housing.
In one embodiment, the shape of described first shell ends mouth is consistent with the port shape of described through hole.Described two
The diameter of the cylindrical space that individual port is formed is less than the diameter of through hole.
Step S22, described siphunculus body passes through described first shell ends mouth, is arranged in described through hole, and closing is described logical
Tube body and described first shell ends mouth.
Step S23, closes described siphunculus with described siphunculus side plate.The tube wall of described siphunculus is of described shield
Point.
Step S24, connects described tank body, siphunculus with described conduit.
In one embodiment, described conduit includes the first conduit and the second conduit；Step S24 specifically includes：Described
One end of one conduit, through the first housing and tank body, is connected with tank interior, and the other end passes through in described siphunculus side plate and siphunculus
Portion connects；One end of described second conduit passes through described siphunculus side plate to connect with inside siphunculus, and the other end is kept with described low temperature
Device ft connection.
With reference to Figure 10, present invention also offers the manufacture method of another described cryostat, described cryostat bag
Include the first housing and the tank body for accommodating cooling medium, described first shell body is located at the outside of described tank body, described low temperature
Keeper also includes siphunculus, conduit, and described siphunculus includes siphunculus body and siphunculus side plate, described conduit and described siphunculus and tank
Body connects, and described tank body includes front head, rear head, inner barrel and outer cylinder body；Described concrete steps include：
Step S50, arranges through hole on tank body, and described through hole is located between described outer cylinder body or between end socket or outer
Between cylinder and end socket.
Step S51, arranges two ports, described port on described first housing position corresponding with described through hole two ends
For the first shell ends mouth；
Step S52, closes described siphunculus body and described siphunculus side plate obtains the siphunculus of sealing, and described siphunculus is passed through institute
State the first shell ends mouth, be arranged in described through hole, close described siphunculus and described first shell ends mouth.
The present embodiment is that with the difference of a upper embodiment, and the present embodiment closes siphunculus body and siphunculus side plate in advance
Obtain the siphunculus sealing；And in a upper embodiment, then be first by siphunculus body place with cylinder through hole in, then first with first
Housing port closed, reuses siphunculus side plate afterwards and closes the first shell ends mouth and siphunculus.It should be noted that step 50 sets
Put the first shell ends mouth and step 51 obtain closing siphunculus body and siphunculus side plate sequencing be not limited to above-mentioned.
Step S52, connects described tank body, siphunculus with described conduit.
In one embodiment, described conduit includes the first conduit, the second conduit, and described first conduit connects described tank body
With described siphunculus, the outside of the described second conduit described siphunculus of connection and described cryostat.
Present invention also offers a kind of cooling means of cryostat.Described cryostat include the first housing and
For accommodating the tank body of cooling medium, described first shell body is located at the outside of described tank body, between described first housing and tank body
For vacuum chamber.Described cryostat also includes siphunculus, conduit, and described conduit connects siphunculus and tank body, the tube wall of described siphunculus
Appropriate section with the screen layer of shield is sharing structure.Described conduit, siphunculus form the cooling road for cooling down shield
Footpath, when making the transmission of cooling medium edge cooling path, the screen layer directly contact with shield.Lead successively by edge for described cooling medium
Pipe, siphunculus conveying, and inject in tank body.
As shown in figure 4, during magnet pre-cooling, liquid nitrogen and liquid helium cold medium are successively injected to tank inner chamber by infusion port 24,
The liquid nitrogen of gasification or liquid helium still have relatively low temperature, by successively through the first conduit, siphunculus and the second conduit, take away heat simultaneously
Amount, overflows finally by mouth 25.The interior circulation of this cold medium can accelerate the rate of cooling of screen layer 3.Meanwhile, screen layer temperature
Reduction can reduce its radiation to tank body 2, further reduce pre-cooling when liquid nitrogen and liquid helium consumption.Also can directly lead to simultaneously
Cross mouth 24 and 25 and inject cold medium pre-cooling to chamber 19, such screen layer can faster be lowered the temperature.
In the same manner, during magnet long-distance transport, because refrigeration machine cannot work, the liquid helium in tank body understands slow evaporation, but temperature
Still relatively low.At this moment close magnet gas outlet, these cold helium will be with the same during pre-cooling, by the first conduit, siphunculus and second
Overflow after conduit.Compared to Conventional cryogenic keeper, this interior circulation can slow down the temperature ramp de of screen layer, reduces to liquid
The heat radiation of helium tank, and then reduce the evaporation of liquid helium, extend haulage time and distance.
For overlength distance transport, liquid nitrogen can be injected in advance in siphunculus, its temperature maintains 70K；Close the first conduit
The valve connecting with tank interior, then during magnet transport, the outside leakage heat to middle shield will initially evaporate the liquid nitrogen in siphunculus,
Middle shield rate of rise in temperature slows down, and haulage time extends further.
Under magnet normal operating conditions, close entrance 22 or outlet 25, in middle shield (siphunculus) cavity 19, helium follows
Ring terminates.In advance the condensate port of outlet 25 poles 8 cold with magnet two-stage system can also be connected.
Compared with prior art, the cryostat that the present invention provides has following Advantageous Effects：
First, wherein screen layer has single heat exchange cavity；During magnet pre-cooling, by injecting liquid helium toward in this cavity
Or the cooling medium such as liquid nitrogen, screen layer temperature-fall period can be dramatically speeded up, save pre-cooling cost；Second, during magnet long-distance transport, lead to
The cooling medium such as injection liquid nitrogen in passing screen layer cavity；Or by the cold helium evaporating in tank body, it is passed through screen layer cavity, can
Slow down the temperature-rise period of screen layer, extend haulage time；3rd, due to the tank body for accommodating cooling medium partial volume not
Need to fill cooling medium, in the case of ensureing refrigerant liquid level, decrease the usage amount of cooling medium；4th,
Through hole and the design of siphunculus, improve the mechanical strength of cryostat housing and tank body.Present invention also offers
The manufacture method of cryostat, cooling means and the magnetic resonance system using described cryostat.
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art, without departing from this
In the spirit and scope of invention, all can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
The scope limiting is defined.
Claims (5)
1. a kind of cryostat, including the tank body for accommodating cooling medium, middle shield and outer layer vacuum cylinder, described
Be vacuum chamber between outer layer vacuum cylinder and described tank body, described middle shield be located at described tank body and described outer layer vacuum cylinder it
Between it is characterised in that described cryostat also includes siphunculus, conduit, described conduit is connected with described siphunculus, tank body, described
Siphunculus is fixed on the first housing, and the section tubular wall of siphunculus is the corresponding ingredient of described first housing；
Described conduit includes the first conduit, the second conduit, and one end of described first conduit is connected with described tank interior, and described
The other end of one conduit connects with inside siphunculus；One end of described second conduit connects with inside described siphunculus, and described second leads
The other end of pipe and described cryostat ft connection.
2. a kind of magnetic resonance system is it is characterised in that include：
Cryostat, described cryostat includes the first housing and is used for accommodating the tank body of cooling medium, and described first
Housing is located at the outside of described tank body, is the first cavity it is characterised in that described low temperature is protected between described first housing and tank body
Holder also includes siphunculus, conduit, and described conduit connects described siphunculus and described tank body, and described siphunculus is fixed on the first housing, and
The section tubular wall of siphunculus is the corresponding ingredient of described first housing；
It is arranged at the superconducting coil in cryostat, for providing the main field carrying out nuclear magnetic resonance；
Gradient system, is used for being produced as magnetic resonance signal carrying out sterically defined gradient magnetic；Radio system, for launching radio frequency
Pulse and reception magnetic resonance signal；Control system, for controlling described gradient system and radio system to carry out magnetic resonance and sweep
Retouch.
3. a kind of manufacture method of cryostat, described cryostat includes the first housing and is used for accommodating cooling medium
Tank body, described first housing body is located at the outside of described tank body, and described cryostat also includes siphunculus, conduit, described logical
Pipe includes siphunculus body and siphunculus side plate, and described conduit is connected with described siphunculus and tank body, described tank body include front head, after
End socket, inner barrel and outer cylinder body are it is characterised in that the method comprising the steps of：
Through hole is arranged on tank body, described through hole is located between described outer cylinder body, or be located at described front head and rear head it
Between, or be located between described outer cylinder body and described end socket；
Two ports are arranged on described first housing position corresponding with described through hole two ends, described port is the first shell ends
Mouthful；
Described siphunculus body pass through described first shell ends mouth, be arranged in described through hole, close described siphunculus body with described
First shell ends mouth；
Close described siphunculus with described siphunculus side plate；
Connect described tank body, siphunculus with described conduit.
4. method as claimed in claim 3 is it is characterised in that described conduit includes the first conduit and the second conduit；Use conduit
Connection tank body, siphunculus and the step outside cryostat specifically include：
With one end of described first conduit, through described first housing and tank body, connect with described tank interior, described first leads
The other end of pipe passes through described siphunculus side plate, connects with inside siphunculus；
One end of described second conduit pass through described siphunculus side plate, with siphunculus inside connect, the other end of described second conduit and
Described cryostat ft connection.
5. a kind of manufacture method of cryostat, described cryostat includes the first housing and is used for accommodating cooling medium
Tank body, described first shell body is located at the outside of described tank body, and described cryostat also includes siphunculus, conduit, described siphunculus
Including siphunculus body and siphunculus side plate, described conduit is connected with described siphunculus and tank body, and described tank body includes front head, rear envelope
Head, inner barrel and outer cylinder body are it is characterised in that step includes：
Through hole is arranged on tank body, described through hole is located between described outer cylinder body, or be located at described front head and rear head it
Between, or be located between described outer cylinder body and end socket；
Two ports are arranged on described first housing position corresponding with described through hole two ends, described port is the first shell ends
Mouthful；
Close described siphunculus body and described siphunculus side plate obtains the siphunculus of sealing, described siphunculus is passed through described first shell ends
Mouthful, it is arranged in described through hole, close described siphunculus and described first shell ends mouth；
Connect described tank body, siphunculus with described conduit.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510054244.2A CN104700976B (en) | 2015-02-03 | 2015-02-03 | Cryostat and its manufacture method, cooling means, magnetic resonance system |
| CN201610873652.5A CN106504847B (en) | 2015-02-03 | 2015-02-03 | Cryostat and its cooling means |
| US15/310,441 US10670675B2 (en) | 2014-11-04 | 2015-09-30 | Displacer in magnetic resonance imaging system |
| GB1707398.2A GB2547581B (en) | 2014-11-04 | 2015-09-30 | Displacer in magnetic resonance imaging system |
| PCT/CN2015/091148 WO2016070695A1 (en) | 2014-11-04 | 2015-09-30 | Displacer in magnetic resonance imaging system |
| US15/448,884 US9835701B2 (en) | 2014-11-04 | 2017-03-29 | Displacer in magnetic resonance imaging system |
| US15/721,801 US10996298B2 (en) | 2014-11-04 | 2017-09-30 | Displacer in magnetic resonance imaging system |
| US16/888,875 US11573279B2 (en) | 2014-11-04 | 2020-06-01 | Displacer in magnetic resonance imaging system |
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| CN201510054244.2A CN104700976B (en) | 2015-02-03 | 2015-02-03 | Cryostat and its manufacture method, cooling means, magnetic resonance system |
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| CN201610873652.5A Division CN106504847B (en) | 2015-02-03 | 2015-02-03 | Cryostat and its cooling means |
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| CN201610873652.5A Active CN106504847B (en) | 2015-02-03 | 2015-02-03 | Cryostat and its cooling means |
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| GB2547581B (en) | 2014-11-04 | 2019-01-09 | Shenzhen United Imaging Healthcare Co Ltd | Displacer in magnetic resonance imaging system |
| CN104900370B (en) * | 2015-06-30 | 2017-03-29 | 奥泰医疗系统有限责任公司 | A kind of superconducting magnet liquid helium container comprising vacuum chamber |
| CN107068371A (en) * | 2017-04-28 | 2017-08-18 | 浙江宝威电气有限公司 | It is a kind of to reduce the transformer of loss |
| CN110529725A (en) * | 2018-05-23 | 2019-12-03 | 张家港中集圣达因特种装备有限公司 | Deep cooling medium storage-transport vessel |
| CN109143131B (en) * | 2018-08-06 | 2020-12-15 | 上海联影医疗科技股份有限公司 | Magnetic resonance imaging system and cryostat thereof |
| CN113782293B (en) * | 2020-06-09 | 2024-04-23 | 上海联影医疗科技股份有限公司 | Cryostat and magnetic resonance system |
| CN115371455B (en) * | 2022-07-21 | 2023-03-10 | 瑞燃(上海)环境工程技术有限公司 | Heat insulation structure and heat insulation method for liquid nitrogen heat exchange equipment |
| CN116313372B (en) * | 2023-05-23 | 2023-08-11 | 宁波健信超导科技股份有限公司 | Superconducting magnet and cooling system and method thereof |
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| CN101893692A (en) * | 2009-05-20 | 2010-11-24 | 西门子公司 | Field generator for magnetic and manufacture method thereof |
| CN102262952A (en) * | 2010-05-25 | 2011-11-30 | 三菱电机株式会社 | Conduction cooling superconducting magnet device |
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| GB2445574B (en) * | 2007-01-11 | 2008-12-17 | Siemens Magnet Technology Ltd | A cryostat for transporting cooled equipment at a cryogenic temperature |
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| CN101893692A (en) * | 2009-05-20 | 2010-11-24 | 西门子公司 | Field generator for magnetic and manufacture method thereof |
| CN102262952A (en) * | 2010-05-25 | 2011-11-30 | 三菱电机株式会社 | Conduction cooling superconducting magnet device |
| CN103975395A (en) * | 2011-12-01 | 2014-08-06 | 株式会社日立制作所 | Superconducting electromagnet device, cooling method therefor, and magnetic resonance imaging device |
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| CN104700976A (en) | 2015-06-10 |
| CN106504847B (en) | 2018-06-19 |
| CN106504847A (en) | 2017-03-15 |
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