CN109256254B - Container connection structure and superconducting magnet system thereof - Google Patents
Container connection structure and superconducting magnet system thereof Download PDFInfo
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- CN109256254B CN109256254B CN201811204272.8A CN201811204272A CN109256254B CN 109256254 B CN109256254 B CN 109256254B CN 201811204272 A CN201811204272 A CN 201811204272A CN 109256254 B CN109256254 B CN 109256254B
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/04—Cooling
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Abstract
The invention relates to the technical field of medical instruments, in particular to a container connecting structure and a superconducting magnet system thereof. A container connecting structure is used for connecting a low-temperature container and a refrigerator with each other, and comprises a connecting block and a connecting part, wherein the connecting block is arranged on the low-temperature container, and the connecting part is arranged on the refrigerator; the connecting structure further comprises a connecting unit, the connecting unit comprises a positioning block, the positioning block is arranged on the connecting block, a connecting groove is formed in the connecting part, and the positioning block is clamped in the connecting groove so that the inner wall of the connecting block is tightly attached to the outer wall of the connecting part; or, the locating piece is located on the connecting portion, the connecting groove has been seted up on the connecting block, the locating piece card is gone into in the connecting groove to make and closely laminate between connecting block inner wall and the connecting portion outer wall. The invention also provides a superconducting magnet system comprising the vessel connection structure.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a container connecting structure and a superconducting magnet system thereof.
Background
A superconducting magnet generally includes a superconducting coil and a cryogenic vessel containing the superconducting coil, the cryogenic vessel containing a cooling medium that bathes the superconducting coil so that the superconducting coil is in a cryogenic operating environment. Common cooling media are liquid helium and the like. Due to the heat conduction and radiation from the interior of the cryogenic container to the outside, heat continues to enter the interior of the cryogenic container, causing the expensive cooling medium to evaporate. Conventionally, in order to solve the problem of evaporation of a cooling medium, a cryogenic refrigerator is generally installed on the cryogenic container, and the interior of the cryogenic container is cooled by the cryogenic refrigerator to take away excess heat, reduce volatilization of liquid helium, and keep the superconducting coil in a low-temperature operating environment.
However, the thermal resistance between the existing low-temperature container and the low-temperature refrigerator is large, and the heat transfer efficiency is low, that is, the refrigeration efficiency of the low-temperature refrigerator is poor, so that the residual heat in the low-temperature container cannot be taken away in time, the consumption of cooling medium is greatly increased, and the cost for maintaining the low-temperature environment is increased.
Disclosure of Invention
In view of the above, it is desirable to provide a container connection structure having low thermal resistance and high heat transfer efficiency, and a superconducting magnet system having the same.
In order to achieve the purpose, the invention adopts the following technical scheme:
a container connecting structure is used for connecting a low-temperature container and a refrigerator with each other, and comprises a connecting block and a connecting part, wherein the connecting block is arranged on the low-temperature container, and the connecting part is arranged on the refrigerator;
the connecting structure further comprises a connecting unit, the connecting unit comprises a positioning block, the positioning block is arranged on the connecting block, a connecting groove is formed in the connecting part, and the positioning block is clamped in the connecting groove so that the inner wall of the connecting block is tightly attached to the outer wall of the connecting part; or, the locating piece is located on the connecting portion, the connecting groove has been seted up on the connecting block, the locating piece card is gone into in the connecting groove to make and closely laminate between connecting block inner wall and the connecting portion outer wall.
In this application, through setting up the coupling unit, work as the locating piece card is gone into when in the spread groove, through the coupling unit makes the connecting block with closely laminate between the connecting portion, in order to reduce the connecting block with thermal resistance between the connecting portion improves the refrigeration efficiency of refrigerator reduces cooling medium's consumption, reduces the cost of maintaining low temperature environment.
In one embodiment, a first inclined plane is arranged on the positioning block, a second inclined plane is arranged in the connecting groove, and after the positioning block is clamped in the connecting groove, the first inclined plane and the second inclined plane are matched with each other, so that the inner wall of the connecting block is tightly attached to the outer wall of the connecting part.
In one embodiment, the connecting portion or the connecting block is provided with a stopping portion, the stopping portion covers the connecting groove along a circumferential portion of the connecting portion or the connecting block, a locking groove and an introduction groove are formed between the stopping portion and an inner wall of the connecting groove in a surrounding manner, the introduction groove is used for guiding the positioning block to enter the locking groove, and the second inclined surface is located in the locking groove.
In one embodiment, the first inclined plane is obliquely arranged relative to the central axis of the refrigerator, the angle of inclination of the first inclined plane relative to the central axis perpendicular to the refrigerator is theta, and 0 degrees < theta <45 degrees; the second inclined plane is obliquely arranged relative to the central axis of the refrigerator, and the inclination angle of the second inclined plane relative to the central axis perpendicular to the refrigerator is equal to the inclination angle of the first inclined plane relative to the central axis perpendicular to the refrigerator.
In one embodiment, the angle of inclination θ,5 ° ≦ θ ≦ 30 °.
In one embodiment, the number of the connecting units is multiple, and the connecting units are distributed on the connecting part along the circumferential direction of the connecting part; or, a plurality of the connecting units are distributed on the connecting block along the circumferential direction of the connecting block.
In one embodiment, the connecting block is provided with a connecting hole, the connecting part is installed in the connecting hole, the aperture of the connecting hole decreases progressively along the direction L, and the outer diameter of the connecting part decreases progressively along the direction L.
In one embodiment, the coupling structure further comprises a locking unit for locking the refrigerator to the cryogenic container.
In one embodiment, the locking unit comprises a first locking part, a second locking part and a locking member, the first locking part is arranged on the low-temperature container, the second locking part is arranged on the refrigerator, and the first locking part and the second locking part are in locking connection through the locking member.
The invention also provides the following technical scheme:
a superconducting magnet system comprises a superconducting coil, a low-temperature container and a refrigerator, wherein a cooling medium is contained in the low-temperature container, the superconducting coil is soaked in the cooling medium, the refrigerator is installed on the low-temperature container through a container connecting structure, the container connecting structure comprises a connecting block and a connecting part, the connecting block is arranged on the low-temperature container, the connecting part is arranged on the refrigerator, the connecting structure further comprises a connecting unit, the connecting unit comprises a positioning block, the positioning block is arranged on the connecting block, a connecting groove is formed in the connecting part, and the positioning block is clamped into the connecting groove so that the inner wall of the connecting block is tightly attached to the outer wall of the connecting part; or, the locating piece is located on the connecting portion, the connecting groove has been seted up on the connecting block, the locating piece card is gone into in the connecting groove to make and closely laminate between connecting block inner wall and the connecting portion outer wall.
Compared with the prior art, connection structure and superconducting magnet system thereof is through setting up the linkage unit, works as the locating piece card is gone into when in the spread groove, through the linkage unit makes the connecting block with closely laminate between the connecting portion, in order to reduce the connecting block with thermal resistance between the connecting portion improves the refrigeration efficiency of refrigerator reduces the consumption of cooling medium, reduces the cost of maintaining low temperature environment.
Drawings
FIG. 1 is a schematic diagram of a superconducting magnet system according to the present invention;
FIG. 2 is a schematic structural diagram of a cryogenic container according to the present invention;
FIG. 3 is a schematic structural diagram of a refrigerator according to the present invention;
FIG. 4 is an enlarged view taken at A of FIG. 1 according to the present invention;
FIG. 5 is an enlarged view at B of FIG. 4 in accordance with the present invention;
FIG. 6 is a schematic structural view of the connection portion and the connection block according to the present invention in an assembled state;
FIG. 7 is an enlarged view at C of FIG. 6 in accordance with the present invention;
FIG. 8 is a schematic view of a container connecting block according to the present invention;
FIG. 9 is a schematic structural view of a container connecting portion according to the present invention;
FIG. 10 is a force analysis graph between a first slope and a second slope according to the present invention;
fig. 11 is an enlarged view of the invention at D in fig. 1.
In the drawing, the superconducting magnet system 100, the superconducting coil 10, the cryogenic container 20, the inner container 21, the liquid helium reflow port 211, the outer container 22, the mounting portion 22a, the mounting hole 221, the first mounting hole 221a, the second mounting hole 221b, the positioning step 221c, the shielding layer 23, the refrigerator 30, the refrigeration stage 30a, the first-stage refrigeration stage 31, the second refrigeration stage 32, the first end 30b of the refrigerator, the second end 30c of the refrigerator, the container connection structure 40, the connection block 41, the connection hole 41a, the connection portion 42, the connection groove 421, the second inclined surface 421a, the introduction groove 421b, the locking groove 421c, the stopper portion 422, the connection unit 43, the positioning block 431, the first inclined surface 431a, the locking unit 44, the first locking portion 441, the second locking portion 442, and the locking member 443 are illustrated.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the present invention provides a superconducting magnet system 100, which is applied to a Magnetic Resonance Imaging (MRI) apparatus, wherein the superconducting magnet system 100 is configured to generate a superconducting Magnetic field to cooperate with a gradient coil or the like to perform MRI.
The superconducting magnet system 100 includes a superconducting coil 10, a cryogenic container 20, and a refrigerator 30, wherein the superconducting coil 10 is accommodated in the cryogenic container 20, a cooling medium is accommodated in the cryogenic container 20 to soak the superconducting coil 10, so that the superconducting coil 10 is in a cryogenic operating environment, the cooling medium may be liquid helium (the temperature of the liquid helium is 4.2k (kelvin)), and the refrigerator 30 is connected to the cryogenic container 20 to cool the inside of the cryogenic container 20 and operate the superconducting coil 10 in the inner container 21 in a cryogenic environment.
The low-temperature container 20 is substantially cylindrical, the low-temperature container 20 includes an inner container 21, an outer container 22 and a shielding layer 23, the inner container 21 is accommodated in the outer container 22, the inner container 21 is filled with a cooling medium, the superconducting coil 10 is accommodated in the inner container 21, the shielding layer 23 is located between the inner container 21 and the outer container 22, and the shielding layer 23 is used for shielding or reducing the heat from the outside to be transmitted into the inner container 21.
Preferably, the inner container 21 and the outer container 22 are both cylindrical, and the central axis of the inner container 21 is overlapped with the central axis of the outer container 22, but of course, in other embodiments, the central axis of the inner container 21 and the central axis of the outer container 22 may not be overlapped.
The inner container 21 is provided with a liquid helium return port 211, the liquid helium return port 211 is communicated with the inside of the inner container 21, and the gasified helium gas is changed into liquid helium through refrigeration of the refrigerator 30 and returns to the inside of the inner container 21 through the liquid helium return port 211.
The outer container 22 is provided with a mounting part 22a, the mounting part 22a is provided with a mounting hole 221, the mounting hole 221 is communicated with the inside of the inner container 21 through the liquid helium reflux port 211, and the refrigerator 30 is mounted on the outer container 22 through the mounting hole 221.
As shown in fig. 3, the refrigerator 30 is provided with at least two refrigeration stages 30a, the two refrigeration stages are a first refrigeration stage 31 and a second refrigeration stage 32, the first refrigeration stage 31 is connected to the shielding layer 23, the temperature of the first refrigeration stage 31 is approximately 50k (kelvin), and the first refrigeration stage 31 is used for maintaining the shielding layer 23 in a low-temperature environment; the second refrigeration stage 32 is connected to the inner container 10, the temperature of the second refrigeration stage 32 is approximately 4.2k (kelvin), and the second refrigeration stage 32 is configured to maintain the temperature in the inner container 10 in a cryogenic environment, so that the superconducting coil 10 is stably in a cryogenic superconducting operating environment.
Further, the refrigerator 30 is made of a copper or copper alloy material, and it is understood that the copper or copper alloy has good ductility, high thermal conductivity, high electrical conductivity, and low electrical resistivity. Of course, in other embodiments, the refrigerator 30 may be made of other metal materials as long as the metal has the advantages of good thermal conductivity, low resistivity, and the like. Preferably, the material of the refrigerator 30 is oxygen-free copper, i.e., copper with a purity of greater than 99.95%. The oxygen-free copper has no hydrogen embrittlement and has good corrosion resistance and low temperature properties, and can maintain good physical properties even in an ultra-low temperature environment in the low temperature container 110.
The refrigerator 30 has a first end 30b and a second end 30c that are oppositely disposed. As shown in fig. 2, the mounting hole 221 includes a first mounting hole 221a and a second mounting hole 221b that communicate with each other, the first mounting hole 221a communicates with the outside, the second mounting hole 221b communicates with the inside of the inner container 21 through the liquid helium recirculation port 211, and the second mounting hole 221b has a smaller hole diameter than the first mounting hole 221a, i.e., it can be understood that a positioning step 221c is formed between the second mounting hole 221b and the first mounting hole 221 a. The first end 30b of the refrigerator 30 is inserted into the first mounting hole 221a and extends into the second mounting hole 221b, the first end 30b of the refrigerator 30 is a second refrigeration stage 32, the second end 30c of the refrigerator 30 is located outside the first mounting hole 221a and connected to the refrigeration device, and the first refrigeration stage 31 is located between the first end 30b and the second end 30 c.
A container connecting structure 40 is arranged between the second refrigerating stage 32 of the refrigerator 30 and the inner wall of the first mounting hole 221a, and the container connecting structure 40 is used for connecting the first refrigerating stage 31 and the shielding layer 23, so that the container connecting structure 40 is used for conducting the cold energy of the first refrigerating stage 31 to the shielding layer 23 and the shielding layer 23 for heat exchange, and the refrigeration of the shielding layer 23 is realized.
As shown in fig. 1 and 4, the container connecting structure 40 includes a connecting block 41 and a connecting portion 42, the connecting block 41 is fixedly disposed on the positioning step 221c in the mounting hole 221 and connected to the shielding layer 23, a connecting hole 41a is formed in the connecting block 41, the connecting hole 41a, the first mounting hole 221a and the second mounting hole 221b are communicated with each other, and the connecting portion 42 is disposed on the refrigerator 30 and located at the first refrigeration stage 31. When the refrigerator 30 is inserted into the second mounting hole 221b, the connecting portion 42 and the connecting block 41 cooperate to connect the shielding layer 23 and the refrigerator 30.
Further, the material of the connecting block 41 is the same as the material of the refrigerator 30, and the connecting block 41 is also manufactured by processing oxygen-free copper.
In one embodiment, the connecting block 41 is connected to the mounting hole 221 by welding. Preferably, the connecting block 41 is welded in the mounting hole 221 by means of vacuum brazing. Of course, in other embodiments, the connecting block 41 may be mounted in the mounting hole 221 by other methods, such as interference fit.
In another embodiment, the connecting block 41 can be connected with the mounting portion 22a as an integral structure, so as to facilitate the processing, manufacturing and assembling of the mounting portion 22 a; the connecting portion 42 is formed as an integrated structure with the refrigerator 30 to facilitate the processing, manufacturing and assembling of the refrigerator 30.
Further, the aperture of the connecting hole 41a decreases in sequence from the outside of the cryogenic container 20 to the inside of the cryogenic container 20 along the central axis of the refrigerator 30, that is, in sequence from the first mounting hole 221a to the second mounting hole 221 b; the connecting portion 42 is cylindrical, the outer diameter of the connecting portion 42 is along the central axis of the refrigerator 30, the direction from the outside of the low-temperature container 20 to the inside of the low-temperature container 30 decreases progressively in sequence, that is, the direction from the first end 30b to the second end 30c of the refrigerator 30 decreases progressively in sequence, so that when the connecting portion 42 is installed in the connecting hole 41a, the connecting area between the connecting portion 42 and the connecting hole 41a can be increased, that is, the matching area between the connecting portion 42 and the connecting block 41 is increased, the thermal resistance between the connecting portion 42 and the connecting block 41 is further reduced, and the refrigeration efficiency of the refrigerator 30 is improved.
Preferably, the connecting hole 41a is circular truncated cone-shaped, that is, the inner diameter of the connecting hole 41a decreases in a linear manner; the connecting portion 42 is circular truncated cone-shaped, that is, the outer diameter of the connecting portion 42 is decreased in a linear manner. Of course, in other embodiments, the connection holes 41a and the connection parts 42 may have other shapes as long as the connection area between the connection parts 42 and the connection blocks 41 can be increased to improve the cooling effect of the refrigerator 30.
Further, as shown in fig. 4 to 6, the container connecting structure 40 further includes a connecting unit 43, the connecting unit 43 is disposed between the connecting block 41 and the connecting portion 42, and the connecting block 41 is further connected to the connecting portion 42 through the connecting unit 43, so that the outer wall of the connecting portion 42 and the inner wall of the connecting block 41 are attached more tightly, the matching area between the connecting portion 42 and the connecting block 41 is increased, the thermal resistance between the connecting portion 42 and the connecting block 41 is reduced, and the refrigerating efficiency of the refrigerator 30 is improved.
Alternatively, the number of the connecting units 43 is plural, and the plural connecting units 43 are distributed between the connecting part 42 and the connecting block 41 along the circumferential direction of the connecting part 42. Further, a plurality of the connection units 43 are distributed on the connection portion 42 along the circumferential direction of the connection portion 42; alternatively, the plurality of connection units 43 are distributed on the hole wall of the connection hole 41a along the circumferential direction of the connection hole 41 a.
Specifically, in the present embodiment, the number of the connection units 43 is 5, and 5 connection units 43 are uniformly distributed between the connection portion 42 and the connection block 41 at intervals in the circumferential direction of the connection portion 42. Of course, in other embodiments, the number of the connection units 43 may be 4, 6 or other numbers, and the specific number may be set according to actual situations and requirements.
Further, as shown in fig. 7 and 8, the connection unit 43 includes a positioning block 431 disposed on an inner wall of the connection block 41, the outer wall of the connection portion 42 is provided with a connection groove 421, and when the connection portion 42 is connected to the connection hole 41a, the positioning block 431 is clamped into the connection groove 421, so that the connection between the connection portion 42 and the connection block 41 is achieved, and meanwhile, the connection area between the connection portion 42 and the connection block 41 is increased, so as to improve the refrigeration efficiency of the refrigerator 30.
Of course, in other embodiments, the positioning block 431 may be disposed on an outer wall of the connection portion 42, in this case, the connection groove 421 is disposed on the connection block 41, and when the connection portion 42 is connected to the connection hole 41a, the positioning block 431 is clamped into the connection groove 421, which may also increase the connection area between the connection portion 42 and the connection block 41.
Preferably, the cross section of the positioning block 431 is substantially trapezoidal, but in other embodiments, the cross section of the positioning block 431 may have other shapes, such as square, irregular, and the like.
Further, the positioning block 431 may be connected to the connecting block 41 or the connecting portion 42 by bonding, welding, or integrally molding. Preferably, in this embodiment, the positioning block 431 is integrally formed with the connecting block 41 or the link 42.
Further, be equipped with first inclined plane 431a on the locating piece 431, have second inclined plane 421a in the connecting groove 421, work as locating piece 431 card is gone into in the connecting groove 421, first inclined plane 431a with second inclined plane 421a interact, so that connecting block 41 inner wall with closely laminate between the connecting portion 42 outer wall. With reference to fig. 7, the connecting groove 421 includes an introduction groove 421b and a locking groove 421c, the introduction groove 421b is communicated with the locking groove 421c, the introduction groove 421b has an opening, the locking groove 421c has the second inclined surface 421a therein, when the refrigerator 30 is installed, the positioning block 431 is first aligned with the introduction groove 421b, after the positioning block 431 is located in the introduction groove 421b, the refrigerator 30 is rotated to accommodate the positioning block 431 in the locking groove 421c, and the first inclined surface 431a of the positioning block 431 is matched, pressed and tightly attached to the second inclined surface 421a in the locking groove 421 c.
Further, a stopping portion 422 is provided on the connecting portion 42, the stopping portion 422 covers the connecting groove 421 along a circumferential portion of the connecting portion 42, so that a portion of the connecting groove 421 covered by the stopping portion 422 surrounds the inner wall of the connecting groove 421 to form the locking groove 421c, and the second inclined surface 421a is located on an inner surface of the stopping portion 422, that is, a surface located inside the locking groove 421 c; the uncovered portion of the connection groove 421 forms the introduction groove 421b having an opening.
The first inclined surface 431a is a straight surface, where a central axis of the refrigerator 30 is defined as X, a direction from the first installation hole 221a to the second installation hole 221b is an L direction (see fig. 2 or fig. 3), the first inclined surface 431a is inclined with respect to the central axis of the refrigerator 30, and an end of the first inclined surface 431a close to the second installation hole 221b is lower than an end of the first inclined surface 431a close to the first installation hole 221a in the L direction. Of course, in other embodiments, an end of the first inclined surface 431a close to the second mounting hole 221b may be higher than an end of the first inclined surface 431a close to the first mounting hole 221a in the L direction.
Referring to fig. 10, an axis Y is defined, the axis Y is perpendicular to the axis X, and an included angle between the first inclined surface 431a and the axis Y is θ, that is, an inclination angle θ of the first inclined surface 431a, 0 ° < θ <45 °; similarly, the second inclined surface 421a is also a straight surface, the second inclined surface 421a is disposed in an inclined manner relative to the central axis of the refrigerator 30, the inclined direction of the second inclined surface 421a is L, and one end of the second inclined surface 421a close to the second mounting hole 221b is higher than one end of the second inclined surface 421a close to the first mounting hole 221a in the L direction, but of course, one end of the second inclined surface 421a close to the second mounting hole 221b is lower than one end of the second inclined surface 421a close to the first mounting hole 221a in the L direction. When the first inclined plane 431a and the second inclined plane 421a are mutually matched, the highest point of the second inclined plane 421a is matched with the lowest point of the first inclined plane 431a, and the lowest point of the second inclined plane 421a is matched with the highest point of the first inclined plane 431 a. An included angle between the second inclined surface 421a and the axis Y is equal to an included angle between the first inclined surface 431a and the axis Y, so that the second inclined surface 421a and the first inclined surface 431a are matched with each other in the L direction, and the inner wall of the connecting block 41 is tightly attached to the outer wall of the connecting portion 42.
In other embodiments, the first inclined surface 431a and the second inclined surface 421a may be both curved surfaces or profiled surfaces; of course, the first inclined surface 431a and the second inclined surface 421a may be matched and tightly attached to each other.
Further, when the positioning block 431 is engaged with the connecting groove 421, as shown in fig. 10, the first inclined surface 431a has a pressure F perpendicular to the second inclined surface 421a with respect to the second inclined surface 421a, and as is apparent from the inclined surface acceptance analysis, the pressure F is divided into an axial component F1 and a horizontal component F2, where the axial direction is the same direction as the direction L and the horizontal direction is the same direction as the axis Y.
It can be understood that F1 makes the connecting portion 42 have a tendency to move toward the connecting block 41, so that the connecting portion 42 and the connecting block 41 are tightly fitted, and at the same time, F1 has a pre-tightening effect, so that the connecting portion 42 is not axially displaced, and the connection is more reliable; f2 is generated by the internal extrusion of the connecting block 41, so that no additional external force is generated on the wall of the mounting hole 221; and according to the slope component force calculation formula: f1 ═ F cos θ, F2 ═ F sin θ; as can be seen from the equation of 0 ° < θ <45 °, F1 is (1-0.71) times F, and F2 is (0.09-0.5) times F, it can be understood that F1 is much larger than F2, so that F2 is negligible compared to F1, and thus, the force acting on the inner wall of the mounting hole 221 can be reduced while ensuring sufficient axial force component to make the first inclined surface 431a and the second inclined surface 421a fit tightly.
Further, the inclination angle theta is more than or equal to 5 degrees and less than or equal to 30 degrees. And according to the slope component force calculation formula: f1 ═ F cos θ, F2 ═ F sin θ; from 5 ° ≦ θ ≦ 30 °, F1 ≦ F was (0.99-0.87) times and F2 ≦ F was (0.09-0.5) times.
In the present embodiment, when θ is 10 ° (sin θ is 0.17 and cos θ is 0.98), F1 is 0.98F and F2 is 0.17F, it is preferable to reduce the force acting on the inner wall of the mounting hole 221 while ensuring sufficient axial force component to make the first inclined surface 431a and the second inclined surface 421a adhere to each other. Of course, in other embodiments, the θ may take on other values in the range of 0 ° -45 °, such as 5 °, 7 °, 8.5 °, 9 °, 11.5 °, 13 °, 15 °, 18 °, 20 °, 25 °, 32 °, or 35 °, and so on.
Further, as shown in fig. 1 and 11, the container connecting structure 40 further includes a locking unit 44, and the locking unit 44 is configured to lock the refrigerator 30 to the mounting portion 22 a.
Specifically, the locking unit 44 includes a first locking portion 441, a second locking portion 442, and a locking member 443, the first locking portion 441 is disposed on the mounting portion 22a, the second locking portion 442 is disposed on the refrigerator 30, and the first locking portion 441 and the second locking portion 442 are lockingly connected by the locking member 443.
Preferably, the first locking portion 441 is a flange, the second locking portion 442 is a flange, and the locking member 443 is a fastener such as a bolt or a screw. Of course, in other embodiments, the locking unit 44 may have other structures, for example, the locking unit 44 may have a riveting structure, a locking structure, or a pin connection structure.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A container connecting structure for interconnecting a cryogenic container and a refrigerator, characterized in that: the connecting structure comprises a connecting block and a connecting part, the connecting block is arranged on the low-temperature container, and the connecting part is arranged on the refrigerator;
the connecting structure further comprises a connecting unit, the connecting unit comprises a positioning block, the positioning block is arranged on the connecting block, a connecting groove is formed in the connecting part, and the positioning block is clamped in the connecting groove so that the inner wall of the connecting block is tightly attached to the outer wall of the connecting part; or the positioning block is arranged on the connecting part, a connecting groove is formed in the connecting block, and the positioning block is clamped in the connecting groove so that the inner wall of the connecting block is tightly attached to the outer wall of the connecting part;
the positioning block is provided with a first inclined surface, a second inclined surface is arranged in the connecting groove, and after the positioning block is clamped in the connecting groove, the first inclined surface and the second inclined surface are matched with each other so that the inner wall of the connecting block is tightly attached to the outer wall of the connecting part;
the connecting part or the connecting block is provided with a stopping part, the stopping part covers the connecting groove along the circumferential part of the connecting part or the connecting block, a locking groove and an introduction groove are formed between the stopping part and the inner wall of the connecting groove in a surrounding manner, the introduction groove is used for guiding the positioning block to enter the locking groove, and the second inclined surface is positioned in the locking groove;
when the refrigerator is installed, the positioning block is aligned to the guide-in groove, after the positioning block is positioned in the guide-in groove, the refrigerator is rotated to enable the positioning block to be accommodated in the locking groove, and the first inclined surface of the positioning block and the second inclined surface in the locking groove are matched with each other, extruded and tightly attached.
2. The container connecting structure according to claim 1, wherein the first inclined surface is disposed obliquely to a central axis of the refrigerator, and an inclination angle of the first inclined surface to a direction perpendicular to the central axis of the refrigerator is θ, 0 ° < θ <45 °; the second inclined plane is obliquely arranged relative to the central axis of the refrigerator, and the inclination angle of the second inclined plane relative to the central axis perpendicular to the refrigerator is equal to the inclination angle of the first inclined plane relative to the central axis perpendicular to the refrigerator.
3. The container connecting structure according to claim 2, wherein the inclination angle θ,5 ° ≦ θ ≦ 30 °.
4. The container connecting structure according to claim 1, wherein the number of the connecting units is plural, and the plural connecting units are distributed on the connecting portion along a circumferential direction of the connecting portion; or, a plurality of the connecting units are distributed on the connecting block along the circumferential direction of the connecting block.
5. The container connecting structure according to claim 1, wherein the connecting block is provided with a connecting hole, the connecting portion is mounted in the connecting hole, the hole diameters of the connecting hole decrease in sequence along the direction L, and the outer diameters of the connecting portion decrease in sequence along the direction L.
6. The container connecting structure according to claim 1, further comprising a locking unit for locking the refrigerator to the cryogenic container.
7. The container connecting structure according to claim 6, wherein the locking unit includes a first locking portion, a second locking portion, and a locking member, the first locking portion is provided on the cryogenic container, the second locking portion is provided on the refrigerator, and the first locking portion and the second locking portion are lockingly connected by the locking member.
8. The container connecting structure according to claim 1, wherein the low-temperature container includes an outer container, a mounting portion is provided on the outer container, and the connecting block is connected to the mounting portion as an integral structure.
9. The container connecting structure according to claim 5, wherein the aperture of the connecting hole decreases in order from the outside of the cryogenic container to the inside of the cryogenic container along the central axis of the refrigerator.
10. A superconducting magnet system comprises a superconducting coil, a cryogenic container and a refrigerator, wherein a cooling medium is contained in the cryogenic container, the superconducting coil is soaked in the cooling medium, the refrigerator is installed on the cryogenic container through a container connecting structure, and the superconducting magnet system is characterized in that:
the container connecting structure comprises a connecting block and a connecting part, the connecting block is arranged on the low-temperature container, the connecting part is arranged on the refrigerator, the connecting structure further comprises a connecting unit, the connecting unit comprises a positioning block, the positioning block is arranged on the connecting block, a connecting groove is formed in the connecting part, and the positioning block is clamped in the connecting groove so that the inner wall of the connecting block is tightly attached to the outer wall of the connecting part; or the positioning block is arranged on the connecting part, a connecting groove is formed in the connecting block, and the positioning block is clamped in the connecting groove so that the inner wall of the connecting block is tightly attached to the outer wall of the connecting part;
the positioning block is provided with a first inclined surface, a second inclined surface is arranged in the connecting groove, and after the positioning block is clamped in the connecting groove, the first inclined surface and the second inclined surface are matched with each other so that the inner wall of the connecting block is tightly attached to the outer wall of the connecting part;
the connecting part or the connecting block is provided with a stopping part, the stopping part covers the connecting groove along the circumferential part of the connecting part or the connecting block, a locking groove and an introduction groove are formed between the stopping part and the inner wall of the connecting groove in a surrounding manner, the introduction groove is used for guiding the positioning block to enter the locking groove, and the second inclined surface is positioned in the locking groove;
when the refrigerator is installed, the positioning block is aligned to the guide-in groove, after the positioning block is positioned in the guide-in groove, the refrigerator is rotated to enable the positioning block to be accommodated in the locking groove, and the first inclined surface of the positioning block and the second inclined surface in the locking groove are matched with each other, extruded and tightly attached.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1961178A (en) * | 2004-05-25 | 2007-05-09 | 西门子磁体技术有限公司 | Refrigerator interface for cryostat |
| CN202813865U (en) * | 2012-07-10 | 2013-03-20 | 上海联影医疗科技有限公司 | Refrigerator cold head installing structure for magnetic resonance superconducting magnet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3134321B2 (en) * | 1991-02-20 | 2001-02-13 | 株式会社日立製作所 | Superconducting conductor |
| CN103000404B (en) * | 2011-09-15 | 2016-09-14 | 西门子公司 | A kind of pipe axle and a kind of switching device including this pipe axle |
| CN103090715B (en) * | 2011-10-31 | 2016-05-11 | 西门子(深圳)磁共振有限公司 | Termal conductor module and manufacture method thereof, refrigeration system, MR imaging apparatus |
| CN206546753U (en) * | 2017-03-23 | 2017-10-10 | 杭州图锐科技有限公司 | A kind of refrigeration machine for superconducting magnet is jacket structured |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1961178A (en) * | 2004-05-25 | 2007-05-09 | 西门子磁体技术有限公司 | Refrigerator interface for cryostat |
| CN202813865U (en) * | 2012-07-10 | 2013-03-20 | 上海联影医疗科技有限公司 | Refrigerator cold head installing structure for magnetic resonance superconducting magnet |
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