CN104252943A - Method for wrapping thermal radiation shielding component by using multi-layer heat insulator, multi-layer heat insulator manufacturing body and superconducting magnet comprising multi-layer heat insulator manufacturing body - Google Patents
Method for wrapping thermal radiation shielding component by using multi-layer heat insulator, multi-layer heat insulator manufacturing body and superconducting magnet comprising multi-layer heat insulator manufacturing body Download PDFInfo
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- CN104252943A CN104252943A CN201310269793.2A CN201310269793A CN104252943A CN 104252943 A CN104252943 A CN 104252943A CN 201310269793 A CN201310269793 A CN 201310269793A CN 104252943 A CN104252943 A CN 104252943A
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Abstract
The invention provides a method for wrapping a thermal radiation shielding component by using a multi-layer heat insulator. The method is characterized by dividing the thermal radiation shielding component into a plurality of basic shape units; for each basic shape unit, cutting the planar multi-layer heat insulator, so that the multi-layer heat insulator can wrap the outer surface of the basic shape unit in a sticking way, wherein for the basic shape unit which cannot be unfolded into a plane, according to a preset curve surface and plane mapping rule, cutting the planar multi-layer heat insulator, so that the spliced heat insulator can be substantially stuck to the corresponding basic shape unit; splicing the cut planar multi-layer heat insulator, and wrapping the multi-layer heat insulator on the surface of the thermal radiation shielding component. The invention also provides a multi-layer heat insulator manufacturing body manufactured by the method and a superconducting magnet comprising the multi-layer heat insulator manufacturing body.
Description
Technical field
The present invention relates to mr imaging technique field, relate to the method by multilayer thermal insulation parcel thermal radiation in superconducting magnet particularly.
Background technology
The method described in this part can be implemented, but may not be by the method conceived in advance or carry out.Therefore, unless otherwise specified herein, otherwise the method described in this part for the claim in the application, being not prior art and not being recognized as prior art by being included in this part.In addition, all embodiments of the present invention need not solve whole (or even any one) in the problem proposed in this part.
In prior art, need by the device of cryogenic refrigeration, as the superconducting coil of the superconducting magnet in magnetic resonance imaging (magnetic resonance imaging MRI) equipment, usually be placed in a cryogen vessel (cryogen vessel), cold-producing medium is helium normally, superconducting coil, cold-producing medium and some other parts being in cold-producing medium warm area are referred to as cold matter (cold mass), cryogen vessel is placed on again in an outer vacuum chamber (vacuum vessel), vacuum is pumped in space between vacuum chamber and cryogen vessel, for cryogen vessel provides effective thermal insulation.Owing to not having resistance in the solenoid of cooling, therefore this coil can produce and keep high-intensity magnetic field.To cause superconducting coil no longer superconduction because temperature rises to certain value, thus resistance raises, resistance raises and produces heat again, and therefore causes the further rising of temperature, therefore temperature must be remained in predetermined low temperature range.Because the temperature difference outside vacuum chamber and between cryogen vessel inside is larger, make between vacuum chamber and cryogen vessel, to there is larger radiant heat, in order to reduce the radiant heat between vacuum chamber and cryogen vessel, a kind of thermal radiation (Thermal shield) is set usually between vacuum chamber and cryogen vessel, is also called cold screen.Fig. 1 shows superconducting magnet agent structure schematic diagram, comprises vacuum chamber 102, thermal radiation 104, cryogen vessel 106 from outside to inside successively, and the inside is normal temperature region 108, is usually located at this region by the object scanned.In the outside of thermal radiation, usually adopt flexible multilayer thermal insulation to wrap up, with blocking radiant heat better, thus reach good low temperature effect of heat insulation.
Traditional thermal radiation is the cylinder of hollow, comprises the face-flange at urceolus (outer cylinder) and inner core (inner cylinder) and two ends, but in order to make thermal radiation more lightly compact, can adopt spinning flange.Spinning flange is curved-surface structure, and its bearing capacity is strong, therefore can reduce wall thickness, thus make thermal radiation weight saving.Meanwhile, under the prerequisite that two ends spacing is certain, curved-surface structure can allow magnet seem compacter.And usually producing the coil in magnetic field near inner core, this TS structure also can be ignored overall system performance impact.But, the flange of this shape, bring difficulty to the parcel of multilayer thermal insulation, still adopt traditional packaging method can not fit well with thermal radiation outer surface, and cause space between vacuum chamber and thermal radiation to be wasted or multilayer thermal insulation is extruded.But we know, any space is all of great value, and meanwhile, each layer heat-insulating property when loose of multilayer thermal insulation is best, and can reduce its heat-insulating property after its some local extruding.
Summary of the invention
According to an aspect of the present invention, a kind of method using multilayer thermal insulation to wrap up thermal radiation is provided, it is characterized in that: thermal radiation is divided into some basic configuration unit; For each basic configuration unit, outer surface more snugly can wrap up basic configuration unit is cut out to the multilayer thermal insulation of plane, wherein, for the basic configuration unit that cannot expand into plane, according to the mapping ruler of predetermined curved surface and plane, the multilayer thermal insulation of plane is cut out, to make the basic configuration unit corresponding to the rear basic laminating of its splicing; The multilayer thermal insulation of the plane after all cutting out is spliced, makes it be wrapped in the surface of thermal radiation.
According to one embodiment of present invention, wherein at least one basic configuration unit is that one section of line rotates and the face of formation around an axle.
According to one embodiment of present invention, wherein said line is curve.
According to one embodiment of present invention, wherein said line is straight line and is not parallel to described axle.
According to one embodiment of present invention, at least one described basic configuration unit, the multilayer thermal insulation of plane is cut into uniform zigzag fashion.
According to one embodiment of present invention, wherein for each tooth of zigzag fashion, the length that its total height equals described line adds adjustment height, and it on, the width of the tooth that any point is corresponding equals this girth around the curve of described axle rotation gained and adds adjustment width divided by the number of the tooth of cut out zigzag fashion.
According to one embodiment of present invention, wherein this adjustment height and width depend on thickness and/or the flexibility of multilayer thermal insulation, and/or this adjustment width depends on the number of the tooth of zigzag fashion.
According to one embodiment of present invention, at least one described basic configuration unit, the multilayer thermal insulation of plane is cut into spiral helicine rectangular.
According to one embodiment of present invention, at least one described basic configuration unit, the multilayer thermal insulation of plane is cut into fan annular.
According to one embodiment of present invention, can take to combine the mode of cutting out or independently cut out to cut out for the multilayer thermal insulation of some basic configuration unit to plane.
According to one embodiment of present invention, can wrap up again after the multilayer thermal insulation layering after cutting out, and be staggered in the stitching portion of be divided into every one deck.
According to a further aspect in the invention, providing a kind of multilayer thermal insulation for wrapping up thermal radiation to make body, it is characterized in that, adopt any one method above-mentioned to make.
According to another aspect of the invention, a kind of superconducting magnet is provided, comprises thermal radiation, and above-mentioned multilayer thermal insulation makes body.
Accompanying drawing explanation
In order to more thoroughly understand content of the present disclosure, below with reference to following description carried out by reference to the accompanying drawings, in the accompanying drawings:
Fig. 1 shows superconducting magnet agent structure schematic diagram;
Fig. 2 a shows the schematic diagram of the traditional thermal radiation adopting face-flange;
Fig. 2 b shows the schematic diagram of the thermal radiation adopting spinning flange;
Fig. 3 a shows and wraps up the schematic diagram after adopting the multilayer thermal insulation of traditional thermal radiation of face-flange to make body expansion;
Fig. 3 b shows parcel according to the present invention and adopts the multilayer thermal insulation of the thermal radiation of spinning flange to make the latter part of schematic diagram of body expansion;
Fig. 4 shows parcel according to the present invention and adopts the multilayer thermal insulation of the thermal radiation of spinning flange to make body to launch latter part of detailed schematic;
Fig. 5 shows parcel according to the present invention and adopts the multilayer thermal insulation of the thermal radiation of spinning flange to make body expansion another schematic diagram latter part of;
Fig. 6 shows parcel according to the present invention and adopts the multilayer thermal insulation of the thermal radiation of spinning flange to make body expansion another schematic diagram latter part of;
Fig. 7 shows the flow chart adopting the multilayer thermal insulation of the thermal radiation of spinning flange according to the making parcel of the embodiment of the present invention.
Embodiment
Describe in detail below with reference to the accompanying drawings and be used for realizing specific embodiments of the invention.But should be understood that, the present invention is not limited to following specific embodiment.
Fig. 2 a shows the schematic diagram of the traditional thermal radiation adopting face-flange, comprises stereogram and main orthographic drawing.Tradition thermal radiation comprises the face-flange at urceolus, inner core and two ends, is the periphery of a hollow.The all deployable rectangle for plane of urceolus and inner core (may be maybe square), wherein a length of side is the circumference of urceolus or inner core, and another length of side is the height of urceolus or inner core.The face-flange at two ends is two equal annulars.
Fig. 3 a shows and wraps up the schematic diagram after adopting the multilayer thermal insulation of traditional thermal radiation of face-flange to make body expansion.Multilayer thermal insulation for wrapping up inner core, urceolus and face-flange can be cut into corresponding shape, consider the thickness of multilayer thermal insulation, shape after cutting out is more bigger than the shape after thermal radiation unfolded surface, namely certain adjustment width is reserved, thermal radiation can be wrapped completely.After this adhesive tape or alternate manner welded seams place is adopted.
Fig. 2 b shows the schematic diagram of the thermal radiation adopting spinning flange.This thermal radiation comprises the spinning flange at urceolus, inner core and two ends, equally also hollow.The all deployable rectangle for plane of urceolus and inner core (may be maybe square), wherein a length of side is the circumference of urceolus or inner core, and another length of side is that cylinder is high.But the shape of spinning flange is the part of the curve such as circle, parabola, ellipse or the more complicated curve surfaces of revolution that pivots and formed normally, can not expand into plane.Practice remains removes parcel by the method described by similar reference diagram 3a, such as the multilayer thermal insulation proper extension of urceolus and inner core will be wrapped up, can engage with the multilayer thermal insulation of toroidal, or the multilayer thermal insulation annulus of parcel flange is done wider, to wrap up spinning flange and to engage with the multilayer thermal insulation of parcel urceolus and inner core, but the outer surface of equal like this thermal radiation of can not fitting, makes the multilayer thermal insulation after making make body volume and is obviously greater than thermal radiation.
Fig. 3 b shows parcel according to the present invention and adopts the multilayer thermal insulation of the thermal radiation of spinning flange to make the latter part of schematic diagram of body expansion.Figure right side is the front view of the thermal radiation adopting spinning flange, left side be for the urceolus of this thermal radiation and the spinning flange at two ends carry out wrapping up cut out after the schematic diagram of planar multilayer heat guard.Preferably, the multilayer thermal insulation united that the spinning flange for urceolus and two ends carries out wrapping up is cut out, and it is advantageous that and can reduce seam.Alternatively, the multilayer thermal insulation that the spinning flange for urceolus and two ends carries out wrapping up is cut out independently, is then stitched together with adhesive tape or alternate manner, it is advantageous that the multilayer thermal insulation material that effectively can utilize small size, thus saves material.As can be seen from Fig. 3 b, in left hand view, in bottom width X ', the rectangular long X of zigzag fashion and right part of flg, the pass of cylindrical diameter D is:
X′＝X＝π*D+n*Δ1 (1)(1)
In left hand view, in rectangular wide Y and right part of flg, the pass of cylindrical high H is:
Y＝H+Δ2 (2)
Wherein Δ 1 and Δ 2 are adjustment nargin, and it depends on thickness and/or the flexibility of multilayer thermal insulation, and Δ 1 can also depend on the number etc. of the tooth of zigzag fashion.Urceolus carries out wrapping up by the multilayer thermal insulation after cutting out with this, splice after, the outer surface of spinning flange of being fitted by zigzag fashion, blend compounds band or alternate manner engage adjacent tooth, thus urceolus and two spinning flange entirety are wrapped up.The number n of tooth chooses, mainly based on several some consideration lower: the thickness of flange size, multilayer thermal insulation, the complexity etc. of making.It is the balance between stickiness and cost of manufacture.In one embodiment, outer barrel diameter D is 1700mm, inner diameter of steel flue 870mm, the vertical section of spinning flange is an oval part, and wherein oval major axis and the ratio of minor axis are 2, the multilayer thermal insulation material adopted is that two-sided metallized film and low heat conduction wall alternately superpose formation, totally 40 layers, its thickness is 1.5cm, n value is 16, the span of Δ 1 can be 17-33mm, sawtooth height 570mm.
Different according to magnet sizes, the diameter of TS urceolus may but be not limited to change between 500mm ~ 2000mm.Multilayer insulant adopts two-sided metallized film and low heat conduction wall alternately to superpose formation usually, and common multilayer heat insulation is made up of 20 ~ 50 layers of such combination, and density controls usually at 28 ~ 32 layers/centimetre.According to diameter and the machining accuracy of cylindrical shell, and the number of plies of multilayer heat insulation, the span of Δ 1 and Δ 2, by difference, for measuring 5% ~ 10% of length, such as in the above embodiments, can reserve 5% ~ 10% of π * D or H value usually.
Fig. 4 shows parcel according to the present invention and adopts the multilayer thermal insulation of the thermal radiation of spinning flange to make body to launch latter part of detailed schematic.It is the detail view of each tooth in Fig. 3 b.Due to the shape normally part of the curve such as circle, parabola, ellipse or the more complicated curve surfaces of revolution that pivots and formed of spinning flange, as seen from the figure, described a part of length of a curve that the total height of tooth equals to pivot to be formed spinning flange adds adjustment nargin Δ 3, this length can be measured and obtain, and also can calculate according to the formula of homologous thread and call parameter.The width w of the tooth that on it, any point is corresponding equals this rotates the curve of the gained number n of girth c divided by the tooth of cut out zigzag fashion around described axle, add adjustment nargin Δ 4, this adjustment nargin depends on the thickness of multilayer thermal insulation, flexibility and/or sawtooth quantity n etc.Their relation can be formulated as:
w＝c÷n+Δ4 (3)
Wherein
c＝2πd (4)
Wherein d is the distance of this point to axle, and this parameter can calculate according to the position relationship of curve shape and curve and axle and obtain.
In one embodiment, the shape of the spinning flange surfaces of revolution that to be one section of curve on ellipse rotate around major axis or the minor axis of ellipse and formed, alternatively, the shape of spinning flange is the surfaces of revolution of one section of curve on ellipse around the axle rotation and formation that are parallel to oval major axis or minor axis.In another embodiment, the shape of spinning flange is the surfaces of revolution that one section of curve on circle is formed around diameter of a circle rotation, alternatively, the shape of spinning flange be circle on one section of curve around this circle institute planar other straight lines rotation and formation the surfaces of revolution.In yet another embodiment, the shape of spinning flange is the surfaces of revolution that one section of curve on parabola is formed around this parabolical axis rotation, alternatively, to be one section of curve on parabola rotate around this Curves axle planar the shape of spinning flange and the surfaces of revolution that formed.In a further embodiment, the shape of spinning flange is the surfaces of revolution that other curve in plane is formed around the axle rotation in this plane.No matter be any curve, can according to width and the height calculating tooth above with reference to the method shown in figure 4.
In embodiment above, described curve and/or described axle are limited in a plane by we is to simplify flange arrangement, reducing the complexity calculated, in fact, the present invention for curve not planar and curve and the situation of axle not in a plane be also feasible, can with to conform to and akin Mathematical Modeling removes segmentation curve or its curved surface formed, to calculate the relevant parameter of the multilayer thermal insulation of parcel flange according to the method shown in reference diagram in the application 4.
Fig. 5 shows parcel according to the present invention and adopts the multilayer thermal insulation of the thermal radiation of spinning flange to make body expansion another schematic diagram latter part of.Shown in this Fig go out mode of a cutting out example just adopting the rectangular form of helical form to cut out, its from inside to outside each circular arc be roughly concentric circles, the excessive line between each concentric circles has randomness.Certainly, also can adopt the circular arc of non-concentric to cut out, rectangular can wide also can the width adopting change etc.The helical form that illustrated plane is cut out is rectangular is suitable for the spinning flange wrapping up shallow mouth, so-called shallow mouth, and the bent curvature of a curve that namely meaning rotates around the axle in plane and formed in the plane of the surfaces of revolution is less.Wherein, rectangular width needs to weigh between stickiness and the amount of seam.Limit adjacent after engaging rectangular winding flange with adhesive tape or other modes, makes the multilayer thermal insulation made make body and roughly to fit the outer surface of flange.The seam that this parcel mode produces in some cases may be less, thus reduce labour and the time cost of assembling.
Fig. 6 shows parcel according to the present invention and adopts the multilayer thermal insulation of the thermal radiation of spinning flange to make body expansion another schematic diagram latter part of.The fan annular that illustrated plane is cut out is suitable for wrapping up the side of the frustum of a cone.Correspondingly, the side that the parameters such as the radian of ring and ring width depend on the frustum of a cone is fanned.Compared with directly wrapping up with traditional planar multilayer heat guard, this parcel mode of cutting the garment according to the figure makes multilayer thermal insulation make body more to fit the outer surface of thermal radiation, advantageously save multilayer thermal insulation material, also have compressed the volume after parcel.
Fig. 7 shows the flow chart adopting the multilayer thermal insulation of the thermal radiation of spinning flange according to the making parcel of the embodiment of the present invention.First the basic configuration unit that thermal radiation can be divided into is determined in a step 702.As shown in Figure 7, inner core and the equal corresponding rectangle of urceolus, spinning flange corresponding rotation face, this surfaces of revolution can be any one surfaces of revolution mentioned above, can be associated specific to the fundamental curve such as ellipse, circle, parabola.If the surfaces of revolution that two kinds of curves rotate after connecting, then can be divided into the surfaces of revolution corresponding respectively with two kinds of curves further, also namely be divided into two basic configuration unit further.Cutting out of multilayer thermal insulation in subsequent step is served in the determination of elementary cell, more specifically, is for the ease of calculating the size of cutting out.
Secondly in step 704, for each basic configuration unit, the outer surface snugly can wrap up basic configuration unit is cut out to the multilayer thermal insulation of plane.
For these basic configuration unit of cylinder, the conical surface and tangent surface, be can to extend distortion through continuous print, curved surface gauffer not occurring and fits with plane with tearing.Their feature has same section along a straight edge line, is the envelope surface of one-parameter family of planes.On these curved surfaces Gaussian curvature be a little zero.For this class basic configuration unit, the multilayer thermal insulation of plane is correspondingly cut out into size is to should of basic configuration unit of plane, alternatively, consider for such as making full use of leftover pieces or being convenient to the unified reasons such as multilayer thermal insulation of cutting out, preferably, the multilayer thermal insulation of multiple uniform sizes specification can be used, alternatively, the multilayer thermal insulation of multiple odd dimensions can be used, corresponding basic configuration unit can be fitted after splicing.The mode of specifically cutting out is described with reference to figure 3a, Fig. 6 above by way of example and not limitation.
And for expanding into the basic configuration unit of plane, the such as surface etc. of ellipsoidal surface, ball, according to the mapping ruler of predetermined curved surface and plane, the multilayer thermal insulation of plane is cut out, with the basic configuration unit that basic laminating after making its splicing is corresponding.
The mapping ruler of described predetermined curved surface and plane, be such as uniform zigzag fashion or spiral helicine rectangular by the surface mapping of ellipsoidal surface, ball, the mode of specifically cutting out is described with reference to figure 3b, Fig. 4 and Fig. 5 above by way of example and not limitation.Preferably, described zigzag fashion or helical form rectangular as a whole; Alternatively, described zigzag fashion or helical form rectangular be the splicing of several more junior units.
Preferably, combining for being suitable for the some basic configuration unit cut out, the multilayer thermal insulation of the different piece of cover heating radiation-screening part integrally can be cut out, can seam be reduced when wrapping up thermal radiation like this.
Then in step 706, the multilayer thermal insulation of the plane after all cutting out spliced, make it be wrapped in the surface of thermal radiation, the mode of splicing can be use adhesive tape, also can use other modes.Like this, multilayer thermal insulation is made body and has just been made.
Preferably, multilayer thermal insulation is carried out layering, be divided into more than 2 groups or 2 groups, the joint often between group is staggered.Good insulation effect can be reached like this, avoid thermal radiation to pass gap that seam crossing may exist and weaken insulation effect.
Although describe specific embodiments of the invention by reference to the accompanying drawings above-mentioned, those skilled in the art without departing from the spirit and scope of the present invention, can carry out various change, amendment and equivalent substitution to the present invention.These change, amendment and equivalent substitution all mean and fall within spirit and scope that the claim of enclosing limits.
Claims (13)
1. use multilayer thermal insulation to wrap up a method for thermal radiation, it is characterized in that:
Thermal radiation is divided into some basic configuration unit;
For each basic configuration unit, outer surface more snugly can wrap up basic configuration unit is cut out to the multilayer thermal insulation of plane, wherein, for the basic configuration unit that cannot expand into plane, according to the mapping ruler of predetermined curved surface and plane, the multilayer thermal insulation of plane is cut out, to make the basic configuration unit corresponding to the rear basic laminating of its splicing;
The multilayer thermal insulation of the plane after all cutting out is spliced, makes it be wrapped in the surface of thermal radiation.
2. the method using multilayer thermal insulation parcel thermal radiation as claimed in claim 1, wherein at least one basic configuration unit is that one section of line rotates and the face of formation around an axle.
3. the method using multilayer thermal insulation parcel thermal radiation as claimed in claim 2, wherein said line is curve.
4. the method using multilayer thermal insulation parcel thermal radiation as claimed in claim 2, wherein said line is straight line and is not parallel to described axle.
5. the method using multilayer thermal insulation parcel thermal radiation as claimed in claim 3, at least one described basic configuration unit, according to described mapping ruler, is cut into uniform zigzag fashion by the multilayer thermal insulation of plane.
6. the method using multilayer thermal insulation parcel thermal radiation as claimed in claim 5, wherein for each tooth of zigzag fashion, the length that its total height equals described line adds adjustment height, and it on, the width of the tooth that any point is corresponding equals this girth around the curve of described axle rotation gained and adds adjustment width divided by the number of the tooth of cut out zigzag fashion.
7. the method using multilayer thermal insulation parcel thermal radiation as claimed in claim 6, wherein said adjustment height and adjustment width depend on multilayer heat insulation body thickness and/or flexibility, and/or described adjustment width depends on the number of the tooth of the zigzag fashion of multilayer thermal insulation.
8. the method using multilayer thermal insulation parcel thermal radiation as claimed in claim 3, at least one described basic configuration unit, according to described mapping ruler, is cut into spiral helicine rectangular by the multilayer thermal insulation of plane.
9. the method using multilayer thermal insulation parcel thermal radiation as claimed in claim 4, at least one described basic configuration unit, is cut into fan annular by the multilayer thermal insulation of plane.
10. the method using multilayer thermal insulation parcel thermal radiation as claimed in claim 1, can take to combine the mode of cutting out or independently cut out and cut out for the multilayer thermal insulation of some basic configuration unit to plane.
11. methods using as claimed in claim 1 multilayer thermal insulation parcel thermal radiation, wherein wrap up after the multilayer thermal insulation layering after cutting out again, and are staggered in the stitching portion of be divided into every one deck.
Make body for the multilayer thermal insulation of wrapping up thermal radiation, it is characterized in that for 12. 1 kinds, adopt the method in claim 1-11 in arbitrary claim to make.
13. 1 kinds of superconducting magnets, comprise thermal radiation, and the multilayer thermal insulation as claim 11 makes body.
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| CN201310269793.2A CN104252943A (en) | 2013-06-28 | 2013-06-28 | Method for wrapping thermal radiation shielding component by using multi-layer heat insulator, multi-layer heat insulator manufacturing body and superconducting magnet comprising multi-layer heat insulator manufacturing body |
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| CN201310269793.2A CN104252943A (en) | 2013-06-28 | 2013-06-28 | Method for wrapping thermal radiation shielding component by using multi-layer heat insulator, multi-layer heat insulator manufacturing body and superconducting magnet comprising multi-layer heat insulator manufacturing body |
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Cited By (2)
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| CN105823996A (en) * | 2015-01-08 | 2016-08-03 | 西门子(深圳)磁共振有限公司 | Thermal radiation screen for superconducting magnet, superconducting magnet and magnetic resonance imaging device |
| CN109239429A (en) * | 2018-09-28 | 2019-01-18 | 上海联影医疗科技有限公司 | Shielding construction, vacuum tank and its magnetic resonance imaging system of superconducting magnet |
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Application publication date: 20141231 |