CN115881386A - Suspension type supporting mechanism of small conduction cooling superconducting magnet - Google Patents
Suspension type supporting mechanism of small conduction cooling superconducting magnet Download PDFInfo
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- CN115881386A CN115881386A CN202211683104.8A CN202211683104A CN115881386A CN 115881386 A CN115881386 A CN 115881386A CN 202211683104 A CN202211683104 A CN 202211683104A CN 115881386 A CN115881386 A CN 115881386A
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Abstract
The invention relates to a suspension type supporting mechanism of a small conduction cooling superconducting magnet, which comprises a cold mass supporting seat, a first low heat conduction pull rod, a joint supporting seat, a second low heat conduction pull rod and a normal temperature supporting seat, wherein the cold mass supporting seat is provided with a first heat conduction pull rod; the outer sides of the cold masses are uniformly provided with cold mass supporting seats, and first low-heat-conduction pull rod spherical surface connection is arranged in the cold mass supporting seats; a normal temperature supporting seat is fixed on the inner sides of the upper flange and the lower flange of the vacuum container, and a second low heat conduction pull rod is arranged in the normal temperature supporting seat in a spherical connection manner; the second low heat conduction pull rod penetrates through holes in the upper end plate and the lower end plate of the cold shield; the first low heat conduction pull rod and the second low heat conduction pull rod are connected together through a joint support seat; the joint supporting seat is connected with a heat conduction supporting belt; one end of the heat conduction supporting belt is fixedly connected to the joint supporting seat; the other end of the heat conduction supporting band is connected and fixed on the upper end plate or the lower end plate of the cold screen. The invention reduces the using amount of the pull rod supporting components, simplifies the internal structure of the superconducting magnet and reduces the heat leakage of a cooling system while fully realizing the supporting function.
Description
Technical Field
The invention relates to a supporting and mounting structure of a small conduction cooling superconducting magnet, and belongs to the technical field of superconducting magnets.
Background
The conduction cooling superconducting magnet adopts a refrigerator to directly cool the cooling mass of the superconducting coil, and the stable operation does not need the participation of refrigerants such as liquid helium and the like, so that the superconducting equipment is not limited by the shortage of helium resources, and the conduction cooling superconducting magnet becomes an important development direction of the superconducting magnet. Because there is no container for storing liquid helium, the total mass and volume of the cold mass of the superconducting coil are greatly reduced. The purely conduction cooled superconducting magnets are all small, limited by the cold mass temperature uniformity. Compared with a large and medium superconducting magnet, the superconducting magnet allows the suspended supporting structure in the superconducting magnet to be properly simplified.
In the laboratory research stage, most of conduction cooling superconducting magnets are in a form of being vertically placed in a room-temperature aperture. The suspension supports are primarily intended to support the weight of the cold mass itself, so suspension support systems are typically simplified to primarily vertical draw suspension. Design and experiment of a conduction cooling type low-temperature superconducting magnet system published in the 5 th (207 th overall) of the 2015 introduces the structural design of the conduction cooling type low-temperature superconducting magnet system, namely a suspension type supporting system is adopted.
However, with the increasing application range of the conduction cooling superconducting magnet in the medical field and the industrial field, factors such as long-distance transportation, earthquake, periodic movement of a magnetic medium in a room temperature hole along an axis and the like need to consider the stress safety problem of multiple degrees of freedom in the suspension type supporting system. Therefore, with reference to medium and large superconducting magnets, a suspension type supporting structure mainly based on axial constraint and having six-degree-of-freedom constraint capability is mostly adopted in the solution of the product-level superconducting magnet, and the cold shield and the cold mass are respectively supported. There are two independent sets of six-degree-of-freedom suspended support structures in such conduction-cooled superconducting magnets. However, the reliability is improved while the complexity of the internal structure of the magnet is increased, and the heat leakage of the cooling system is increased while the supporting structural member is increased.
Compared with a liquid helium soaking cooling superconducting magnet, the small conduction cooling superconducting magnet has lighter cold mass and cold shield, and is obviously restrained by excess if the same supporting form as the former is adopted.
Therefore, it is necessary to design the internal suspended support structure of the small conduction cooled superconducting magnet appropriately, so as to reduce the support heat leakage, increase the freedom of support constraint, improve the performance of the magnet system, and simplify the manufacturing process by reducing the complexity of the support.
Disclosure of Invention
The invention aims to provide a suspension type supporting mechanism of a small conduction cooling superconducting magnet, which aims to reduce the supporting heat leakage, increase the supporting constraint freedom degree, improve the performance of a magnet system and simplify the manufacturing process by reducing the supporting complexity.
In order to achieve the above object, the present invention provides a suspension type supporting mechanism for a small conduction cooling superconducting magnet, which comprises a cold mass supporting seat, a first low thermal conductive pull rod, a joint supporting seat, a second low thermal conductive pull rod and a normal temperature supporting seat;
the outer side of the cold mass is provided with an outer framework, two ends of the outer framework are provided with stainless steel rings, and more than 3 cold mass supporting seats are uniformly distributed on the stainless steel rings at the two ends;
a through hole is formed in the cold mass supporting seat, and the first low heat conduction pull rod penetrates through the through hole;
the first low heat conduction pull rod is arranged towards the other end of the cold mass along the axial direction of the cold mass, and meanwhile, the first low heat conduction pull rod is arranged outwards along the diameter direction of the cold mass;
the normal temperature supporting seats matched with the cold quality supporting seats in quantity and distribution direction are fixed on the inner sides of the upper flange and the lower flange of the vacuum container;
the normal temperature supporting seat is provided with a through hole, and a second low heat conduction pull rod penetrates through the through hole;
through holes are arranged on the upper end plate and the lower end plate of the cold shield; the second low heat conduction pull rod passes through the through hole without obstruction and is arranged towards the direction of the cold mass;
the first low heat conduction pull rod and the second low heat conduction pull rod are connected together through the joint support seat;
the joint supporting seat is connected with a heat conduction supporting belt;
one end of the heat conduction supporting belt is fixedly connected to the joint supporting seat;
and the other end of the heat conduction supporting belt is connected and fixed on the upper end plate or the lower end plate of the cold screen.
As a further improvement of the invention, two ends of the cold mass are provided with 4 cold mass supporting seats at each end; the cold mass supporting seats at each end are uniformly distributed, and the included angle between every two adjacent cold mass supporting seats is 90 degrees.
Furthermore, the first low heat conduction pull rod arranged at the upper end of the cold mass is adjacent to the first low heat conduction pull rod arranged at the lower end of the cold mass.
As a further improvement of the present invention, an included angle between an axis of the first low thermal conductive pull rod and a central axis of the cold mass is α, α =20 ° ± 5 °.
As a further improvement of the invention, the through holes arranged on the upper end plate and the lower end plate of the cold shield are round holes, and the inner diameter of each through hole is more than 10mm larger than the outer diameter of the second low heat conduction pull rod.
Further, the inner diameter of the through hole is 20mm larger than the outer diameter of the second low heat conduction pull rod.
As a further improvement of the present invention, the first low thermal conductive tie rod and the second low thermal conductive tie rod are double-headed screws;
the cold mass supporting seat and the normal temperature supporting seat are provided with through holes for a screw to pass through;
the joint supporting seat is of a hollow structure and comprises a shell, and an installation fixing cavity is arranged in the middle of the shell;
the mounting and fixing cavity is provided with an open window; through holes for the screw to pass through are formed in the two ends of the mounting and fixing cavity;
the first low-heat-conduction pull rod is connected with the cold mass supporting seat and the joint supporting seat through a screw and nut structure;
the second low heat conduction pull rod with the normal atmospheric temperature supporting seat, and with between the joint supporting seat, connect through screw nut structure.
Furthermore, the inner diameters of the cold mass supporting seat, the normal temperature supporting seat and the through hole formed in the joint supporting seat are 2-4 mm larger than the outer diameter of the threaded rod.
Furthermore, through holes are formed in the cold mass supporting seat, the normal temperature supporting seat and the joint supporting seat, and a concave spherical surface is arranged on one side close to the fixing side of the nut;
a spherical gasket is arranged on the screw rod penetrating through the through hole, and the spherical surface of the spherical gasket falls into the concave spherical surface;
the nut of the fixing screw rod is positioned on one side of the plane of the spherical gasket.
Furthermore, the root of the external thread of the screw is provided with 2 symmetrical flat surfaces to form a wrench clamping part.
As a further improvement of the invention, the cross section of the heat-conducting supporting belt is Z-shaped;
the other end of the heat conduction supporting belt is fixedly connected to an upper end plate or a lower end plate of the cold shield close to the joint supporting seat.
Further, the heat-conducting support belt is made of hard aluminum alloy.
Furthermore, a lug is arranged on the outer side of the shell of the joint supporting seat, and a supporting hole is formed in the lug;
the heat conduction supporting belt penetrates through the supporting belt hole through a fastening piece and is fixed on the convex sheet of the joint supporting seat.
The invention relates to a suspension type supporting mechanism of a small conduction cooling superconducting magnet, which takes a vacuum container as a fixed shell, fixes a normal temperature supporting seat on an upper flange and a lower flange of the shell, then sequentially connects a second low heat conduction pull rod, a joint supporting seat and a first low heat conduction pull rod, and finally connects the two ends of a cold mass through a cold mass supporting seat; the pull rod supporting components are rigid components, can better bear pulling force, and are respectively provided with 4 sets of pull rod supporting components along the upper end and the lower end of the cold mass, and the pull rod supporting components are obliquely and outwards arranged, so that the force of 3 degrees of freedom of the cold mass can be borne.
According to the suspension type supporting mechanism of the small conduction cooling superconducting magnet, the concave spherical surface is arranged at the through hole at the connecting part of the screw rod, and then the concave spherical surface is matched with the spherical surface gasket for fixing to form the spherical joint, so that the pull rod supporting assembly has a certain posture angle self-adaptive adjusting function.
Compared with the existing suspension type supporting structure, the suspension type supporting mechanism of the small conduction cooling superconducting magnet has the following advantages:
1. the first low heat conduction pull rod and the second low heat conduction pull rod are made of high-strength non-metal composite materials generally; the roots of the external threads of the screws at the two ends are provided with 2 symmetrical flat surfaces as wrench clamping parts, so that the pull rod can be fixed in an auxiliary manner in the process of screwing the nut, the defect that the strength of the external threads formed by a non-metal composite material is poorer than that of a metal material is overcome, and the whole pull rod supporting assembly is reliably connected;
the position of the parallel flat surface needs to be ensured to be exposed out of the through hole after assembly, so that a clamping tool is convenient to use for fixing in the process of screwing the nut, the nut is prevented from rotating along with screwing, and tightening is convenient to realize;
2. the cold shield is fixed in an auxiliary way through the heat conduction supporting belt of the Z-shaped structure; the heat conduction supporting belt is made of hard aluminum alloy materials, so that high-efficiency heat conduction can be realized, and the heat isolation of the joint supporting seat is realized by utilizing the cold shield temperature; meanwhile, the material has high strength and can play a role in supporting the cold shield; the Z-shaped structure design can automatically adapt to the strain caused by cold shrinkage;
3. for the conduction cooling superconducting magnet, the cold mass is connected with the secondary cold head of the helium refrigerator by adopting a flexible heat conduction belt, and the cold shield is also connected with the primary cold head of the helium refrigerator by adopting a flexible heat conduction belt, so that the suspension type supporting structure is allowed to displace a little under the action of external force. The connecting parts of the screw rods at the two ends of the first low heat conduction pull rod and the second low heat conduction pull rod, the cold mass supporting seat, the normal temperature supporting seat and the joint supporting seat are provided with ball joints formed by matching of concave spherical surfaces and spherical surface gaskets, so that the pull rod supporting assembly can bear impact from certain acceleration of each degree of freedom. For the joint support base, after the first low heat conduction pull rod and the second low heat conduction pull rod are installed in place, a gap of 2-5 mm is required to be reserved at the end parts of the two pull rods;
4. the spherical gasket is preferably made of brass material, and if the spherical gasket is made of stainless steel material, the spherical contact surface needs to be polished and passivated, so that the spherical joint component can exert a good self-adaptive adjustment effect and resist impact force;
5. according to the invention, 8 sets of pull rod support assemblies are preferably adopted, every 4 sets of pull rod support assemblies form a group, and the two groups of pull rods provide pull forces in opposite directions for the cold mass in the axis direction; the two sets of pull rod assemblies at the opposite side are staggered by a distance in the circumferential direction, and each set of pull rod assembly provides 2-3 degrees of freedom for constraint; meanwhile, the cold shield and the cold mass share one set of pull rod supporting assembly, and extra fixing pieces do not need to be added.
Compared with the conventional design, the suspension type supporting mechanism reduces the number of the pull rod supporting components by half; after the equipment is installed, the axial direction of the cold mass is the main bearing direction, and the support of the upper and lower 4 sets of pull rod support components is obtained; while during transportation of the device or during an earthquake, the flexible support structure can provide constraint for movement in all six degrees of freedom.
The superconducting magnet cooling system has the advantages that the internal structure of the superconducting magnet is simplified and the heat leakage of the superconducting magnet cooling system is reduced while the supporting function is fully realized.
Drawings
Fig. 1 is a schematic view of the overall application state of the suspended support mechanism of the small conduction-cooled superconducting magnet according to the present invention;
FIG. 2 is a half sectional view of FIG. 1
FIG. 3 is a schematic view of the overall structure of the cold mass (including the first low thermal conductivity tie bar) of FIG. 1;
FIG. 4 is a schematic view of the overall structure of the drawbar device;
FIG. 5 is a schematic view of the overall structure of the drawbar;
FIG. 6 is a cross-sectional view at the flat side of the pull rod;
FIG. 7 is a cross-sectional view of the joint support base;
fig. 8 is a sectional view showing a state of use of the joint support base.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The invention relates to a conduction cooling superconducting magnet with a vertically-arranged room-temperature bore, and an application state of a suspension type supporting mechanism of the small conduction cooling superconducting magnet is shown in fig. 1 and fig. 2.
The upper flange 11 of the vacuum container, the lower flange 12 of the vacuum container, the outer cylinder (hidden in the figure) of the vacuum container and the inner cylinder 15 of the vacuum container are connected together to form a chamber of the vacuum container. The upper flange 11 of the vacuum container is provided with a helium refrigerator which can output cold (reaching 4K to 269.15 ℃).
A cold shield is arranged in the cavity of the vacuum container, namely the cold shield is formed by connecting an upper cold shield end plate 21, a lower cold shield end plate 22, an outer cold shield cylinder (hidden in the figure) and an inner cold shield cylinder 24 together; the cold screen is a cold shielding chamber, wherein the upper end plate 21 of the cold screen is in flexible thermal connection with the primary cold head of the helium refrigerator.
The cold screen is provided with a target object to be fixed by the invention, and is used for conducting and cooling the cold mass 31 of the superconducting magnet, and the cold mass 31 is in contact with a secondary cold head of the helium refrigerator through a flexible cold conducting connecting part (hidden in the figure). The inner side of the cold mass 31 is a skeleton inner cylinder 34, on which a superconducting coil 312 is arranged, and the outer side is provided with an outer skeleton 311.
The suspended support mechanism for the small conduction cooling superconducting magnet is implemented by arranging cold mass support seats 32 on two ends (stainless steel rings) of the outer wall of an outer framework 311 of the cold mass 31, arranging through holes in the cold mass support seats 32, and penetrating first low heat conduction pull rods 33 into the through holes, wherein the first low heat conduction pull rods 33 are arranged along the central axis of the cold mass 31 toward the other end of the cold mass 31 (namely, the first low heat conduction pull rods 33 fixed on the cold mass support seats 32 positioned below are arranged upwards, and the first low heat conduction pull rods 33 fixed on the cold mass support seats 32 positioned above are arranged downwards), and meanwhile, the first low heat conduction pull rods 33 are arranged outwards along the horizontal direction of the cold mass 31. Referring to fig. 2 (the upper cold mass support base 32 and the support components such as the first low thermal conductivity pull rod 33 are hidden in the figure, and only the fixing plate 321 of the cold mass support base 32 is shown), a normal temperature support base 13 is arranged on the inner side of the vacuum container upper flange 11 (or the vacuum container lower flange 12), a through hole is arranged on the normal temperature support base 13, and the second low thermal conductivity pull rod 14 is arranged in the through hole; a through hole 23 is formed in the upper end plate 21 (or the lower end plate 22) of the cold shield, and the second low heat conduction pull rod 14 penetrates through the through hole 23 and enters the cavity of the cold shield; since the second low thermal conductive tie rod 14 passes through the through hole 23 in an inclined manner, when the through hole 23 is a circular hole, the diameter of the through hole 23 needs to be significantly larger than the outer diameter of the second low thermal conductive tie rod 14, more than 10mm, preferably 20mm; the end of the first low heat conduction pull rod 33 is connected with the end of the second low heat conduction pull rod 14 through a joint support seat 4. An included angle between the axis of the first low heat conduction pull rod 33 and the central axis of the cold mass 31 is α, α =20 ° ± 5 °, and α =18 ° in the figure, so that the first low heat conduction pull rod 33 can apply a vertical pulling force and also can apply a horizontal pulling force to the cold mass 31; when the angle alpha is too small, the horizontal component force borne by the pull rod supporting assembly is small and is not enough to resist the horizontal force of the cold mass 31; when the angle alpha is too large, the positions of the normal temperature supporting seat 13 on the upper flange and the lower flange of the vacuum container need to be arranged outwards, even exceed the range of the flanges of the vacuum container.
The length of the second low heat conduction pull rod 14 is shorter than that of the first low heat conduction pull rod 33, so that the joint support seat 4 is close to the cold shield end plate (the cold shield upper end plate 21 or the cold shield lower end plate 22) where the through hole 23 through which the second low heat conduction pull rod 14 connected with the joint support seat passes, and the joint support seat 4 is also connected with the heat conduction support band 5 and is connected to the close cold shield end plate. The cross section of the heat conduction supporting strip 5 is Z-shaped, namely a certain redundancy is left in the length direction of the heat conduction supporting strip 5. The heat conduction support band 5 is made of a material with good heat conductivity and good strength, such as a hard aluminum alloy; the heat conduction supporting band links together articulated support seat 4 and cold screen, utilizes the temperature of cold screen to realize carrying out the thermal insulation to articulated support seat 4 (and the first low heat conduction pull rod 33 of being connected with it, the low heat conduction pull rod 14 of second), and duralumin alloy intensity is better simultaneously, can support the cold screen, and "Z" shape can the extra that relevant part of automatic adaptation brought because of shrinkage meets an emergency again.
With further reference to fig. 3, two ends of the cold mass 31 are provided with 4 cold mass supporting seats 32, and 4 cold mass supporting seats 32 at each end are uniformly distributed on the outer wall of the end portion; 1 first low-heat-conduction pull rod 33 penetrates through each cold mass supporting seat 32, namely 4 sets of pull rod supporting components are arranged at the upper end of each cold mass 31 and connected with the lower flange 12 of the vacuum container, and 4 sets of pull rod supporting components are arranged at the lower end of each cold mass 31 and connected with the upper flange 11 of the vacuum container; the upper and lower sets of 4 tie-rod support assemblies are arranged crosswise to secure the cold mass 31 within the vacuum vessel chamber.
Theoretically, only 3 sets of pull rod supporting assemblies are needed on each side, positioning and fixing (three points determine a plane) can be realized, but a backup can be formed by adopting 4 sets of pull rod supporting assemblies; and 4 sets of pull rod supporting components are mutually separated by 90 degrees, so that the pull rod supporting components can fully bear the left and right stress and the front and back stress in the horizontal direction and then bear the upward or downward force together.
Further preferentially, the pull rod supporting component arranged at the upper end of the cold mass 31 and the pull rod supporting component arranged at the lower end of the cold mass 31 are arranged adjacent to each other, so that other surfaces on the cold mass 31 are vacated, and an electric connecting part, a high-cold-conducting flexible connecting part and the like are installed.
The cold quality supporting seat 32, the first low heat conduction pull rod 33, the joint supporting seat 4, the second low heat conduction pull rod 14 and the normal temperature supporting seat 13 are connected together to form a set of pull rod supporting assembly. Wherein, the cold mass support base 32 is fixed on the cold mass 31, and the normal temperature support base 13 is fixed on the upper and lower flanges of the vacuum container chamber. The cold mass supporting seat 32, the joint supporting seat 4 and the normal temperature supporting seat 13 are preferably made of stainless steel materials, and are convenient to process, weld and the like; the first low thermal conductive pull rod 33 and the second low thermal conductive pull rod 14 are preferably made of high-strength non-metallic composite materials, so that the heat insulation performance is good, and the cold loss is prevented.
Referring to fig. 4, the first low thermal conductivity pull rod 33, the joint support 4, and the second low thermal conductivity pull rod 14 are preferably located on the same axis. With further reference to fig. 5, the first low thermal conductivity pull rod 33, or the second low thermal conductivity pull rod 14, is a double-threaded screw with external threads 61 on both ends; the external thread 61 end of the pull rod is inserted into the through hole of the cold mass supporting seat 32, or the through hole of the normal temperature supporting seat 13, or the through hole of the joint supporting seat 4, and is adjusted and locked through the nut 73.
Further, at the root of the external thread 61 (i.e., inside of the tie rod), a flat surface 62 is provided; referring to fig. 6, in the axial direction of the drawbar, there are preferably 2 flat surfaces 62 symmetrical at the same position, thereby forming a grip for wrench operation; when the nut 73 is screwed by a wrench for adjustment and locking, the flat surface 62 close to the nut 73 is clamped by the wrench at the same time, so that the pull rod is prevented from rotating along with the pull rod; and because the pull rod is made of non-metal composite materials, the strength of the external thread 61 on the pull rod is poor, so that the flat surface 62 is clamped by a wrench, the stress condition of the pull rod during screwing can be improved, and the external thread 61 is protected.
The concrete structure of the joint support base 4 refers to fig. 7; the joint support seat 4 is a hollow structure and comprises a shell 41, and a mounting and fixing cavity 42 is arranged in the middle of the shell; the mounting and fixing cavity 42 is provided with an open window, and a fastener can be placed into the mounting and fixing cavity 42 from the outside and extend into a wrench for operation; two ends of the mounting and fixing cavity 42 are provided with pull rod holes 43, and the diameter of each pull rod hole 43 is 2-4 mm larger than the outer diameter of a pull rod (the first low heat conduction pull rod 33 or the second low heat conduction pull rod 14) which passes through the pull rod; the inner side of the pull rod hole 43 is processed to form a concave spherical surface 44. The shell 41 of the joint support 4 is externally provided with a protruding piece 45, and a support hole 46 is arranged in the protruding piece for installing the heat conduction support belt 5.
When the joint support base 4 is used, refer to fig. 8; the external thread 61 end of the pull rod (the first low thermal conductive pull rod 33 or the second low thermal conductive pull rod 14) is inserted into the pull rod hole 43, and the end part is located in the mounting and fixing cavity 42 and is sequentially sleeved with a spherical gasket 71, a spring gasket 72 and a lock nut 73, and the spherical surface of the spherical gasket 71 falls into the concave spherical surface 44; the lock nut 73 is tightened by a wrench to fix the tension rod on the joint support base 4. The spherical gasket 71 is preferably made of brass, and the posture angle can be adaptively adjusted in the concave spherical surface 44 due to the self-lubricating property of the brass; of course, the spherical washer 71 may be made of stainless steel, but the spherical contact surface needs to be polished and passivated.
The through holes on the cold mass supporting seat 32 and the normal temperature supporting seat 13 are also arranged according to the pull rod hole 43 on the joint supporting seat 4, and the outer side of the through holes is provided with a concave spherical surface; when the pull rod is used, the external thread 61 end of the outer end of the pull rod (the first low heat conduction pull rod 33 or the second low heat conduction pull rod 14) is inserted into the through hole, then sequentially penetrates through the spherical gasket 71, the spring gasket 72 and the locking nut 73 to be connected and fixed, and the pull rod is enabled to have the function of adjusting the posture angle along with self-adaptation through the matching of the spherical gasket 71 and the concave spherical surface.
Further, the protruding piece 45 is fixedly connected with the heat-conducting supporting strap 5, and a supporting strap mounting screw 74 passes through the supporting strap hole 46 on the protruding piece 45 and penetrates through the heat-conducting supporting strap 5, and then is screwed into the nut 75 to realize fixing; of course, the two can be directly connected by a rivet. The other end of the heat conduction supporting strip 5 is connected and fixed with a cold shield end plate (an upper cold shield end plate 21 or a lower cold shield end plate 22) through a fastener (a screw nut or a rivet).
The invention relates to a suspension type supporting mechanism of a small conduction cooling superconducting magnet, which takes a vacuum container as a fixed shell (consisting of an upper flange 11 of the vacuum container, a lower flange 12 of the vacuum container, an outer cylinder of the vacuum container and an inner cylinder 15 of the vacuum container), fixes a normal temperature supporting seat 13 on the upper flange and the lower flange of the shell, then sequentially connects a second low heat conduction pull rod 14, a joint supporting seat 4 and a first low heat conduction pull rod 33, and finally connects the two ends of a cold mass 31 through a cold mass supporting seat 32; the pull rod supporting components are rigid components, can better bear pulling force, and are respectively provided with 4 sets of pull rod supporting components at the upper end and the lower end of the cold mass 31, and the pull rod supporting components are also obliquely and outwards arranged, so that the force of the cold mass 31 in all directions can be borne. Joint support seat 4 still is equipped with lug 45, and then connects heat conduction support area 5, and finally fixed mutually with the upper and lower end plate of cold screen, and heat conduction support area 5 is the duralumin alloy material, can high-efficient heat conduction, utilizes cold screen temperature to realize cutting off to the heat of joint support seat 4, and material intensity is high simultaneously, can play the effect of supporting the cold screen, and "Z" shape structural design can adapt to the meeting an emergency that the shrinkage brought automatically again.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed, but is capable of various modifications and substitutions without departing from the spirit of the invention.
Claims (10)
1. The small suspension type supporting mechanism for the conduction cooling superconducting magnet is characterized by comprising a cold mass supporting seat, a first low heat conduction pull rod, a joint supporting seat, a second low heat conduction pull rod and a normal temperature supporting seat;
an outer framework is arranged on the outer side of the cold mass, stainless steel rings are arranged at two ends of the outer framework, and more than 3 cold mass supporting seats are uniformly distributed on the stainless steel rings at the two ends;
a through hole is formed in the cold mass supporting seat, and the first low heat conduction pull rod penetrates through the through hole;
the first low heat conduction pull rod is arranged towards the other end of the cold mass along the axial direction of the cold mass, and meanwhile, the first low heat conduction pull rod is arranged outwards along the diameter direction of the cold mass;
the normal temperature supporting seats matched with the cold quality supporting seats in quantity and distribution direction are fixed on the inner sides of the upper flange and the lower flange of the vacuum container;
the normal temperature supporting seat is provided with a through hole, and a second low heat conduction pull rod penetrates through the through hole;
through holes are arranged on the upper end plate and the lower end plate of the cold shield; the second low heat conduction pull rod passes through the through hole without obstruction and is arranged towards the direction of the cold mass;
the first low heat conduction pull rod and the second low heat conduction pull rod are connected together through the joint support seat;
the joint supporting seat is connected with a heat conduction supporting belt;
one end of the heat conduction supporting belt is fixedly connected to the joint supporting seat;
and the other end of the heat conduction supporting belt is connected and fixed on the upper end plate or the lower end plate of the cold screen.
2. A suspended support mechanism for a small conduction cooled superconducting magnet as claimed in claim 1 wherein there are 4 said cold mass support seats at each end of said cold mass; the cold mass supporting seats at each end are uniformly distributed, and the included angle between every two adjacent cold mass supporting seats is 90 degrees.
3. A suspended support mechanism for a small conduction cooled superconducting magnet as claimed in claim 2 wherein said first low thermal conductivity pull rod disposed at an upper end of said cold mass is disposed adjacent said first low thermal conductivity pull rod disposed at a lower end of said cold mass.
4. A suspended support mechanism for a small conduction cooled superconducting magnet as claimed in claim 3 wherein the angle between the axis of the first low thermal conductivity rod and the central axis of the cold mass is α, α =20 ° ± 5 °.
5. A suspended support mechanism for a small conduction cooled superconducting magnet as claimed in claim 1, wherein the through holes provided in the upper and lower end plates of the cold shield are circular holes, and the inner diameter of the through holes is greater than the outer diameter of the second low thermal conductive rods by 10mm or more.
6. The suspended support mechanism for a small conduction cooled superconducting magnet of claim 1, wherein the first and second low thermal conductivity pull rods are double-threaded screws;
through holes for the screw to pass through are formed in the cold mass supporting seat and the normal temperature supporting seat;
the joint supporting seat is of a hollow structure and comprises a shell, and an installation fixing cavity is arranged in the middle of the shell;
the mounting and fixing cavity is provided with an open window; through holes for the screw to pass through are formed in the two ends of the mounting and fixing cavity;
the first low-heat-conduction pull rod is connected with the cold mass supporting seat and the joint supporting seat through a screw and nut structure;
the second low heat conduction pull rod is connected with the normal temperature supporting seat and the joint supporting seat through a screw and nut structure 5.
7. The suspended support mechanism for a small conduction cooled superconducting magnet as claimed in claim 6, wherein the through holes provided in the cold mass support, the normal temperature support and the joint support have concave spherical surfaces on the side near the nut fixing;
a spherical gasket is also arranged on the screw rod penetrating through the through hole, and the spherical surface of the spherical gasket is arranged in the concave spherical surface;
and the nut of the 0 fixing screw is positioned on one side of the plane of the spherical gasket.
8. A suspended support mechanism for a small conduction cooled superconducting magnet as claimed in claim 6 wherein there are 2 flat surfaces symmetrically formed at the root of the external thread of the screw to form a wrench clamping portion.
9. A suspended support mechanism for a small conduction cooled superconducting magnet as claimed in claim 1 wherein the cross-section of the thermally conductive support straps is "Z" shaped;
and 5, the other end of the heat conduction supporting belt is fixedly connected to the upper end plate or the lower end plate of the cold screen close to the joint supporting seat.
10. The suspended support mechanism for a small conduction cooled superconducting magnet as claimed in claim 9, wherein the joint support seat is provided with a lug outside the shell, and the lug is provided with a support hole;
the heat conduction supporting belt penetrates through the supporting belt hole through a fastening piece and is fixed on the convex sheet of the joint supporting seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211683104.8A CN115881386A (en) | 2022-12-27 | 2022-12-27 | Suspension type supporting mechanism of small conduction cooling superconducting magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211683104.8A CN115881386A (en) | 2022-12-27 | 2022-12-27 | Suspension type supporting mechanism of small conduction cooling superconducting magnet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116153041A (en) * | 2023-04-17 | 2023-05-23 | 江西联创光电超导应用有限公司 | Pull rod emergency early warning system for superconducting magnet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116153041A (en) * | 2023-04-17 | 2023-05-23 | 江西联创光电超导应用有限公司 | Pull rod emergency early warning system for superconducting magnet |
| CN116153041B (en) * | 2023-04-17 | 2023-08-18 | 江西联创光电超导应用有限公司 | Pull rod emergency early warning system for superconducting magnet |
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