Fixing assembly of high-temperature superconducting magnetic fluid propulsion refrigerating device
By combining epoxy tie rods and titanium alloy tie rods, the fixing components of the high-temperature superconducting magnetohydrodynamic propulsion cooling device were optimized, solving the problems of contradiction between mechanical strength and thermal conduction, insufficient thermal management, and poor system integration, and achieving the effect of low thermal conductivity and high mechanical reliability.
Patent Information
- Application Number
- CN202511711660.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-20
- Publication Date
- 2026-02-13
AI Technical Summary
Existing high-temperature superconducting magnetohydrodynamic propulsion and cooling devices suffer from defects in their stationary components, such as the contradiction between mechanical strength and heat conduction, insufficient thermal management, inadequate material and structural optimization, and poor system integration, resulting in high energy consumption and poor stability during operation.
The design employs a combination of multiple epoxy tie rods and titanium alloy tie rods. The epoxy tie rods bear the axial compressive force, while the titanium alloy tie rods bear the axial tensile force. The tie rods are hinged to the refrigeration unit via their bases, and thermal management is achieved through the use of epoxy tie rod heat sinks. This creates a symmetrical inclined tie-suspension structure, optimizing material distribution and connection methods.
It achieves high mechanical strength and low thermal conductivity, reduces heat transfer from room temperature to low temperature, meets the requirements of mechanical reliability and electromagnetic force resistance, and at the same time reduces operating energy consumption and allows for precise management of low temperature thermal stress.
Smart Images
Figure CN121520780A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of high-temperature superconducting magnet cooling technology, specifically, it relates to a fixed component of a high-temperature superconducting magnetohydrodynamic propulsion cooling device. Background Technology
[0002] Magnetohydrodynamic (MHD) propulsion is an advanced ship propulsion technology that utilizes the interaction between a strong magnetic field and an electric field generated by a superconducting magnet to generate thrust from seawater. Among these technologies, high-temperature superconducting (HTS) materials, such as REBCO (yttrium barium copper oxide) tapes, exhibit great application potential due to their high critical temperature (typically in the liquid nitrogen temperature range, above 77K), which can significantly reduce the operating and maintenance costs of superconducting magnets.
[0003] High-temperature superconducting magnetohydrodynamic (MHD) propulsion is an advanced propulsion method widely used in shipbuilding, aerospace, and other fields. Its core component, the high-temperature MHD storage device, needs to operate in extremely low-temperature environments, typically cooled by a refrigeration unit (such as a Dewar). In this system, a fixing component connects the high-temperature MHD storage device to the outer Dewar of the refrigeration unit to counteract the enormous electromagnetic forces generated during operation, while ensuring effective thermal management, reducing heat transfer from room temperature to the cryogenic temperature, thereby lowering energy consumption and improving system reliability.
[0004] In existing technologies, the stationary components of high-temperature superconducting magnetohydrodynamic propulsion cooling devices typically employ a single material or a simple structural design, such as using metal tie rods (e.g., stainless steel or aluminum alloy) for connection. However, this design suffers from the following drawbacks: (1) The contradiction between mechanical strength and thermal conductivity: Although metal tie rods have high mechanical strength and can withstand certain tensile or compressive loads, their thermal conductivity is high, resulting in a large heat leakage from room temperature to the low temperature end, which increases the cooling load and operating energy consumption. At the same time, under extremely low temperature conditions, the thermal shrinkage rate of metal materials is high, which can easily cause thermal stress concentration, which may lead to loosening or damage of connecting parts and affect the stability of the system.
[0005] (2) Inadequate thermal management: Existing fixed components often lack effective thermal management measures, such as the absence of a dedicated heat sink structure, making it impossible to precisely control low-temperature thermal stress. This may lead to local overheating or cold spots, affecting the performance of the superconducting magnetohydrodynamic fluid, or even causing malfunctions.
[0006] (3) Insufficient material and structural optimization: In the existing technology, the distribution and hinge method of the tie rods are relatively simple and have not been optimized according to the type of force (such as tension or compression). For example, the tie rods are usually arranged vertically or horizontally, which cannot effectively distinguish the components that bear tensile and compressive forces, resulting in low material utilization and bulky structure. In addition, the hinge method may use rigid connection, which is difficult to adapt to the dimensional changes caused by thermal expansion and contraction, increasing the assembly difficulty and risk.
[0007] (4) Poor system integration: High-temperature superconducting magnetohydrodynamic storage devices are usually integrated with components such as magnet cold shields and Dewars, but existing fixing components do not fully consider the collaborative design of these components, resulting in poor thermal isolation or reduced mechanical reliability. For example, the connection point between the tie rod and the Dewar may be located in a critical area of heat leakage, further aggravating the heat conduction problem.
[0008] Therefore, there is an urgent need in this field for a new type of fixing component that can simultaneously meet the requirements of high mechanical strength, low thermal conductivity, precise thermal stress management, and efficient system integration. Summary of the Invention
[0009] To address the shortcomings of existing technologies, the purpose of this invention is to provide a fixed component for a high-temperature superconducting magnetohydrodynamic propulsion cooling device.
[0010] The fixing assembly of the high-temperature superconducting magnetohydrodynamic propulsion and cooling device provided by the present invention includes: a plurality of epoxy tie rods and a plurality of titanium alloy tie rods; One end of the epoxy tie rod is connected to the end of the high-temperature superconducting magnetohydrodynamic storage device, and the other end of the epoxy tie rod is connected to the outer Dewar of the refrigeration device; One end of the titanium alloy rod is connected to the end of the high-temperature superconducting magnetohydrodynamic storage device, and the other end of the titanium alloy rod is connected to the outer Dewar of the refrigeration device. The two ends of the epoxy tie rod are connected to the outer Dewar hinge of the high-temperature superconducting magnetofluid storage device and the refrigeration device through the tie rod base; The two ends of the titanium alloy tie rod are connected to the outer Dewar hinge of the high-temperature superconducting magnetohydrodynamic storage device and the refrigeration device through the tie rod base; The multiple epoxy tie rods are uniformly subjected to axial compressive force, and the multiple titanium alloy tie rods are uniformly subjected to axial tensile force.
[0011] Preferably, the rod base of the high-temperature superconducting magnetohydrodynamic storage device includes: a titanium alloy rod base and an epoxy rod base, wherein the titanium alloy rod and the epoxy rod are respectively hinged to the titanium alloy rod base and the epoxy rod base; When the high-temperature superconducting magnetofluid storage device is placed horizontally, the titanium alloy tie rod base is distributed on the upper half of the end face of the high-temperature superconducting magnetofluid storage device, and the epoxy tie rod base is distributed on the lower half of the end face of the high-temperature superconducting magnetofluid storage device. The titanium alloy tie rod base and the epoxy tie rod base are respectively distributed symmetrically to correspond to multiple epoxy tie rods and multiple titanium alloy tie rods.
[0012] Preferably, the epoxy tie rod is hinged to the inner wall of the outer Dewar of the refrigeration device via a diagonal tie base; The epoxy tie rod is connected to the epoxy tie rod base and the inclined tie base at both ends to form a symmetrical inclined tie rod structure, which enables the epoxy tie rod to withstand axial compressive force.
[0013] Preferably, the titanium alloy tie rod is hinged to the side circumferential surface of the outer Dewar of the refrigeration device via a titanium alloy tie rod tailstock; One end of the titanium alloy tie rod penetrates the side circumference of the outer Dewar of the refrigeration device and is then fixed by the titanium alloy tie rod tail seat; the two ends of the titanium alloy tie rod are respectively connected to the titanium alloy tie rod base and the titanium alloy tie rod tail seat to form a vertical hoisting structure, so that the titanium alloy tie rod can withstand axial tensile force.
[0014] Preferably, a heat sink is provided on the side of the epoxy tie rod near the outer Dewar layer of the refrigeration device, and the heat sink is used for thermal management of the epoxy tie rod.
[0015] Preferably, the epoxy tie rod is formed by impregnating glass fiber or carbon fiber with epoxy resin and then curing it; the epoxy tie rod base is secured by a locking pin. The snap ring cylindrical pin assembly is hinged to the epoxy tie rod.
[0016] Preferably, the high-temperature superconducting magnetohydrodynamic storage device is a magnetic liquid nitrogen cylinder; The magnetic liquid nitrogen cylinder includes: an inner liquid nitrogen cylinder and an outer liquid nitrogen cylinder arranged coaxially, and two liquid nitrogen cylinder sealing plates; a circular through hole is opened in the center of the liquid nitrogen cylinder sealing plate, and after assembly, the circular through holes on the two liquid nitrogen cylinder sealing plates are respectively connected to the two ends of the inner liquid nitrogen cylinder, and the outer circumference of the two liquid nitrogen cylinder sealing plates are respectively connected to the two ends of the outer liquid nitrogen cylinder. The magnetic liquid nitrogen cylinder sealing plate has threaded holes and positioning holes, and the pull rod base is fixed by the cooperation of the threaded holes and positioning holes.
[0017] Preferably, it further includes: a magnet cooling screen; The magnet cold screen includes: a cold screen inner cylinder and a cold screen outer cylinder arranged coaxially, and cold screen cover plates located at both ends of the magnet cold screen, wherein the cold screen inner cylinder passes through the center of the liquid nitrogen cylinder inner cylinder; The cold screen inner cylinder, cold screen outer cylinder, and cold screen cover plate, when combined, surround the high-temperature superconducting magnetofluid.
[0018] Preferably, the outer Dewar of the refrigeration device is a magnetic Dewar; The magnet Dewar includes: a Dewar inner cylinder and a Dewar outer cylinder arranged coaxially, and two Dewar end caps; the Dewar inner cylinder passes through the center of the cold screen inner cylinder, and the Dewar inner cylinder, Dewar outer cylinder and Dewar end caps, when combined, surround the magnet cold screen; The titanium alloy tie rod tailstock is mounted on the outer cylinder of the Dewar, and the inclined tie base is mounted on the inner wall of the outer cylinder of the Dewar; The titanium alloy tie rod penetrates the outer cylinder of the Dewar and connects to the titanium alloy tie rod tailstock.
[0019] Preferably, coil rods are provided on both end faces of the high-temperature superconducting magnetofluid, and the high-temperature superconducting magnetofluid is connected to the outer cylinder of the liquid nitrogen cylinder through the coil rods.
[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention utilizes the high strength, high rigidity, and extremely low thermal conductivity of titanium alloy tie rods and titanium alloy tie rod connectors to withstand enormous mechanical loads, while minimizing heat conduction from room temperature to low temperature; it also meets the requirements for mechanical reliability and resistance to enormous electromagnetic forces. 2. This invention utilizes epoxy tie rod heat sink components, taking advantage of the extremely high specific strength, near-zero thermal shrinkage rate, and low thermal conductivity of composite materials to meet the needs of reducing operating energy consumption and finely managing low-temperature thermal stress. Attached Figure Description
[0021] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram showing the installation position of the fixed component of the present invention; Figure 2 This is a schematic diagram showing the position of the pull rod base of the present invention; Figure 3 This is a schematic diagram of the mounting structure of the fixed component according to an embodiment of the present invention; Figure 4 This is a schematic diagram showing the details of the epoxy tie rod connection of the present invention; Figure 5 This is a schematic diagram of the overall structure of the refrigeration device according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure of the Dewar protrusion in an embodiment of the present invention; Figure 7 This is a structural diagram of the conduction refrigeration of the dual refrigeration device according to an embodiment of the present invention; Figure 8 This is a partial schematic diagram of the magnet Dewar of the present invention.
[0022] The diagram shows: Detailed Implementation
[0023] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.
[0024] like Figure 1 As shown, this embodiment of the invention provides a fixing component for a high-temperature superconducting magnetohydrodynamic propulsion refrigeration device, used to reliably fix the multi-layer structure of the high-temperature superconducting magnetohydrodynamic propulsion refrigeration device; the fixing component of the high-temperature superconducting magnetohydrodynamic propulsion refrigeration device includes: an epoxy tie rod 5 and a titanium alloy tie rod 6; One end of the epoxy tie rod 5 is fixed to the end of the high-temperature superconducting magnetohydrodynamic (MHD) storage device, and the other end is connected to the inner wall of the outer Dewar of the refrigeration device via a corresponding tie rod base. Specifically, the tie rod base is welded to the inner wall of the outer Dewar of the refrigeration device. One end of the titanium alloy tie rod 6 is fixed to the end of the high-temperature superconducting MHD storage device, and the other end is fixed to the outer Dewar of the refrigeration device. Further, the epoxy tie rod 5 and the titanium alloy tie rod 6 are hinged to the end of the high-temperature superconducting MHD storage device and the inner wall of the outer Dewar of the refrigeration device via tie rod bases. Specifically, as shown... Figures 1 to 3 As shown, the pull rod base on the end face of a single high-temperature superconducting magnetofluid storage device includes: multiple titanium alloy pull rod bases 61 and multiple epoxy pull rod bases 51; when the high-temperature superconducting magnetofluid storage device is placed horizontally, the multiple titanium alloy pull rod bases 61 and the multiple epoxy pull rod bases 51 are evenly distributed on the upper and lower halves of the end face of the high-temperature superconducting magnetofluid storage device, respectively; in a more specific embodiment, the high-temperature superconducting magnetofluid is fixed inside the high-temperature superconducting magnetofluid storage device by two sets of four coil pull rods 66, and the epoxy pull rod bases 51 are secured by locking pins. The retaining ring cylindrical pin kit is hinged to the epoxy tie rod 5; in a preferred embodiment, the coil tie rod 66 is made of titanium alloy. The 8×27H retaining ring cylindrical pin kit, used in liquid nitrogen-cooled superconducting coil devices, mainly consists of cylindrical pins with an 8mm diameter, an overall length of 27mm, and H-shaped heads (flat or grooved H-shaped heads). The matching elastic retaining ring is also 8mm in diameter, with an inner diameter slightly smaller than the cylindrical pin to achieve pre-tightening. The kit is typically made of 304 stainless steel with a hardness of approximately 40~45HRC, possessing good corrosion resistance and sufficient mechanical strength. It can operate stably within a temperature range of –40°C to +200°C, meeting the structural connection requirements between the cryogenic side (approximately 77K) and the ambient temperature side. Dimensional tolerances conform to GB / T5783 standards, with a diameter error of approximately ±0.02mm and a length error of approximately ±0.1mm. The surface is often chrome-plated or polished to prevent rust and corrosion. The cylindrical pin is hinged to the tie rod base through a threaded hole or positioning hole, and the snap ring provides axial elastic preload, so that the four-point symmetrical lower end diagonal pull and upper end hoisting structure can evenly distribute the compression or tensile load of the superconducting coil during liquid nitrogen cooling. This ensures high strength and low heat conduction, and achieves reliable hinge and coaxiality maintenance. The overall assembly is simple and suitable for superconducting magnet support systems with high mechanical load and precise positioning.
[0025] Furthermore, such as Figure 4 As shown, the tie rod base installed on the inner wall of the outer Dewar of the refrigeration device includes: inclined tie bases 52 welded to both ends of the inner wall of the outer Dewar of the refrigeration device; the epoxy tie rod 5 is connected to the epoxy tie rod base 51 and the inclined tie base 52 at both ends to form a symmetrical inclined tie rod structure, so that the inclined epoxy tie rod 5 can withstand axial compressive force. In addition, the portion of the epoxy tie rod 5 near the outer Dewar of the refrigeration device is provided with a tie rod heat sink 53, which realizes the thermal management of the epoxy tie rod 5; the epoxy tie rod 5 is usually made of glass fiber or carbon fiber impregnated with epoxy resin and then cured.
[0026] The device forms symmetrical force chains at both ends of different levels, with the load evenly distributed across eight supports. This significantly reduces the axial stress in individual members and improves the overall structural stiffness. Similar to the "multiple cables sharing the load" principle of cable-stayed bridges, this effectively reduces bending moments within the beam and lowers material usage. Furthermore, the symmetrical cable-stayed design... The hoisting assembly forms a closed mechanical loop, enabling the structure to mutually restrain itself when subjected to electromagnetic forces, thermal expansion, or external impacts, preventing unilateral displacement or torsion, and improving the system's vibration and sway resistance. The lower diagonal tie rod is made of composite materials (thermally conductive glass fiber / carbon fiber is also an option). The epoxy resin has an extremely low coefficient of thermal expansion; the upper titanium alloy lifting rod also has very low thermal conductivity. The symmetrical layout allows heat flow to cancel each other out on both sides, reducing the thermal bridging effect from room temperature to the low-temperature end and helping to maintain the low-temperature environment of the refrigeration unit. Furthermore, the above structural design provides redundant safety; the four-point symmetry means that even if one of the tie rods or lifting rods fails partially, the remaining three can still bear most of the load, maintaining structural stability and preventing overall instability due to single-point failure. In addition, the symmetrical hinged base allows each rod to be positioned in one of the four predetermined symmetrical positions during assembly, allowing installation errors to cancel each other out, ensuring the coaxiality of the magnet and the Dewar, and simplifying on-site commissioning and subsequent maintenance. In short, the upper pull and lower support form a statically determinate or ultrastatically indeterminate stable spatial structure, firmly fixing the high-temperature superconducting magnetohydrodynamic storage device in the center, resisting forces from all directions (gravity, electromagnetic force, vibration, etc.), ensuring its precise positioning and mechanical integrity during operation.
[0027] A titanium alloy tie rod end seat 62 is provided on the side circumferential surface of the outer Dewar of the refrigeration device. One end of the titanium alloy tie rod 6 penetrates the side circumferential surface of the outer Dewar of the refrigeration device and is fixed by the titanium alloy tie rod end seat 62. The two ends of the titanium alloy tie rod 6 are connected to the titanium alloy tie rod base 61 and the titanium alloy tie rod end seat 62 respectively to form a vertical hoisting structure. The titanium alloy tie rod 6 bears the axial tensile force.
[0028] The titanium alloy upper rod and the epoxy tie rod at the lower rod will experience relative displacement during cooling due to their different rates of thermal contraction. The hinged connection (rather than a rigid connection) at both ends provides the necessary degrees of freedom for this differential thermal contraction, allowing the components to rotate slightly during thermal expansion and contraction, thereby releasing internal thermal stress and preventing structural damage.
[0029] The working principle of this invention is as follows: the titanium alloy tie rod 6, based on its high strength, high stiffness, and extremely low thermal conductivity, can withstand enormous mechanical loads and electromagnetic forces while suppressing thermal deformation, ensuring structural mechanical reliability and minimizing heat conduction from room temperature to low temperatures. Meanwhile, the epoxy tie rod 5, based on its extremely high specific strength, near-zero thermal shrinkage, and extremely low thermal conductivity, aims to reduce system operating energy consumption (cooling power consumption) and integrates components such as heat sinks to precisely manage low-temperature thermal stress.
[0030] like Figures 1 to 8As shown, in a more specific embodiment 1, the fixing component provided by the present invention is a dual-cooling device for high-temperature superconducting magnetohydrodynamic propulsion. This dual-cooling device includes: a magnetic liquid nitrogen cylinder 1 serving as a storage device for the high-temperature superconducting magnetohydrodynamic fluid; a superconducting magnet coil 3 serving as the high-temperature superconducting magnetohydrodynamic fluid; and a magnetic Dewar 2 serving as the outer Dewar of the cooling device. Multiple tie rod bases are installed on each end face of the magnetic liquid nitrogen cylinder 1, including two titanium alloy tie rod bases 61 and two epoxy tie rod bases 51. Positionally, the two titanium alloy tie rod bases 61 are located in the upper-middle part after the magnetic liquid nitrogen cylinder 1 is installed, and the two epoxy tie rod bases 51 are located in the lower-middle part. The titanium alloy tie rods 6 and 5 are hinged to their corresponding titanium alloy tie rod bases 61 and epoxy tie rod bases 51, respectively. A base for hinged connection with the tie rod is also provided on the inner wall of the outer cylinder 21 of the magnet Dewar 2. After the liquid nitrogen cylinder 1 of the magnet is fixed, the epoxy tie rod 5 bears the axial compressive force and the titanium alloy tie rod 6 bears the axial tensile force. Specifically, a slanted base 52 for hinged connection with the epoxy tie rod 5 is provided on the inner wall of the outer cylinder 21 of the magnet Dewar 2, and a titanium alloy tie rod tail seat 62 is provided on the outer cylinder 21 of the magnet Dewar 2. The titanium alloy tie rod 6 is fixed by the titanium alloy tie rod tail seat 62 after penetrating the outer cylinder 21 of the magnet Dewar 2.
[0031] More specifically, magnetic liquid nitrogen cylinder sealing plates 11 are provided on both end faces of the magnetic liquid nitrogen cylinder 1. Threaded holes 7 and positioning holes 8 are provided on the magnetic liquid nitrogen cylinder sealing plates 11 at the mounting positions of the pull rod base. The pull rod base (titanium alloy pull rod base 61 and epoxy pull rod base 51) is fixed by fasteners in cooperation with the threaded holes 7 and positioning holes 8.
[0032] Inside the magnet Dewar 2, a magnet cold shield 4 is also installed. The magnet cold shield 4 has a cylindrical structure and is located between the magnet Dewar 2 and the liquid nitrogen cylinder 1, which is surrounded by the magnet cold shield 4. The function of the magnet cold shield 4 is to directly reduce radiation conduction. The cold shield provides an optically opaque thermal barrier for the superconducting magnet coil 3, protecting it from the influence of high-temperature components such as the vacuum chamber and the Dewar. The installation method of the magnet cold shield 4 is as follows. Figure 3 As shown, one end of the titanium alloy tie rod 6 is connected to the titanium alloy tie rod base 61 on the magnetic liquid nitrogen cylinder sealing plate 11, and the other end passes through the magnetic cold screen 4 and is connected to the magnetic Dewar 2 through the titanium alloy tie rod tail seat 62, ensuring that the overall connection of the magnet and the magnetic liquid nitrogen cylinder 1 system components is stable. The magnetic cold screen 4 is fixed by bolts and other fasteners on the upper surface of the cold screen fixing seat 41 and the lower surface of the cold screen fixing seat 42, and then limited and fixed by the cold screen support epoxy nut 43, thereby further limiting and fixing the magnetic cold screen 4 through the titanium alloy tie rod 6.
[0033] The superconducting magnet coil 3 is installed inside the liquid nitrogen cylinder 1. Specifically, the liquid nitrogen cylinder 1 includes a liquid nitrogen inner cylinder 12, a liquid nitrogen outer cylinder 13, and liquid nitrogen cylinder sealing plates 11 located at both ends of the liquid nitrogen cylinder 1, which are arranged coaxially. A circular through hole is opened in the center of the liquid nitrogen cylinder sealing plate 11. After assembly, the circular through holes on the two liquid nitrogen cylinder sealing plates 11 are respectively connected to the two ends of the liquid nitrogen inner cylinder 12, and the outer circumference of the two liquid nitrogen cylinder sealing plates 11 is respectively connected to the two ends of the liquid nitrogen outer cylinder 13.
[0034] The superconducting magnet coil 3 is modularly assembled in series to form a high-temperature superconducting magnet, which is then installed horizontally. The specific installation steps are as follows: First, the inner cylinder 12 of the liquid nitrogen cylinder passes through the center of the high-temperature superconducting magnetofluid. Then, the high-temperature superconducting magnetofluid with the inner cylinder 12 of the liquid nitrogen cylinder is placed inside the outer cylinder 13 of the liquid nitrogen cylinder. Two coil pull rods 66 are set on each of the two end faces of the high-temperature superconducting magnetofluid. The high-temperature superconducting magnetofluid is connected to the outer cylinder 13 of the liquid nitrogen cylinder through the above four titanium alloy pull rods 66. Finally, the liquid nitrogen cylinder sealing plate 11 is assembled.
[0035] The magnet cold screen 4 includes a cold screen inner cylinder 44 and a cold screen outer cylinder 46 arranged coaxially, and a cold screen cover plate 45 located at both ends of the magnet cold screen 4; the cold screen inner cylinder 44 passes through the center of the liquid nitrogen cylinder inner cylinder 12, and the cold screen inner cylinder 44, the cold screen outer cylinder 46 and the cold screen cover plate 45 are combined to surround the high temperature superconducting magnetofluid.
[0036] The magnet Dewar 2 includes an inner Dewar cylinder 21, an outer Dewar cylinder 22, and a Dewar end cap 23. The inner Dewar cylinder 21 passes through the center of the inner cylinder 44 of the cold screen. The inner Dewar cylinder 21, the outer Dewar cylinder 22, and the Dewar end cap 23, when combined, surround the magnet cold screen 4.
[0037] A detachable connection port is provided on the high-temperature superconducting magnetofluid. The detachable connection port is electrically connected to the superconducting magnet coil 3 of the high-temperature superconducting magnetofluid through a lead wire for experimental testing.
[0038] In a more preferred embodiment, inner and outer reinforcing rings are respectively provided at the weld joints between the inner cylinder 44, the outer cylinder 46, and the end caps 45 of the cold screen to enhance sealing and insulation effects. The epoxy tie rod 5 and the titanium alloy tie rod 6 pass through the magnet cold screen 4 by drilling holes in the outer cylinder 46 and the end caps 45.
[0039] The outer cylinder 22 of the magnet Dewar 2 extends outward to form a Dewar protrusion 9 with an approximately cuboid internal space. A conductive cooling system is mounted on the Dewar protrusion 9. Specifically, as... Figure 6As shown, the Dewar protrusion 9 includes a Dewar mounting side plate 91 and a Dewar mounting top plate 92. A cold head mounting flange is provided on the Dewar mounting top plate 92. The conductive refrigerator 100 is mounted on the cold head mounting flange. The cold head of the conductive refrigerator 100 is located inside the Dewar protrusion 9. The cold head is connected to the high-temperature superconducting component in sequence through a primary heat conduction component and a secondary heat conduction component to achieve heat exchange.
[0040] like Figure 7 As shown, the conductive cooling system uses a GM refrigerator. The secondary conductive cooling assembly includes a secondary cold head 101, which is positioned near the center of the high-temperature superconducting magnetofluid. Multiple secondary conductive plates 102 are arranged on both sides of the secondary cold head 101 along the directions of the two ends of the high-temperature superconducting magnetofluid. One secondary conductive plate 102 is fixedly connected to the secondary cold head 101, and adjacent secondary conductive plates 102 are connected by a flexible connection assembly 103. The main body of the secondary conductive plate 102 is made of oxygen-free copper, and the flexible connection assembly 103 is composed of multiple layers of thin copper foil. The flexible connection design is for better heat dissipation and increased conductive cooling efficiency.
[0041] The secondary cooling plate 102 and the flexible connection assembly 103 are connected to the magnet cooling plate 108 on the superconducting magnet coil 3 by screws, thereby achieving the purpose of the GM refrigerator cooling the superconducting magnet coil 3.
[0042] At both ends of the high-temperature superconducting magnetofluid and the two ends of the magnetic liquid nitrogen cylinder 1, four magnetic liquid nitrogen cylinder heat sinks 104 and magnetic heat sinks are designed, symmetrically distributed at both ends. Their function is to conduct heat generated by the components out of the device through thermal conductivity and dissipate it into the surrounding environment, which is beneficial for uniform cooling; such as Figure 8 As shown, the two magnet liquid nitrogen cylinder heat sinks 104 are connected by copper wire soldering to assist in cooling, which helps to uniformly cool the high-temperature superconducting magnet and the magnet liquid nitrogen cylinder 1. This design is for cooling under full load of 10 superconducting magnet coils 3. Depending on different working conditions, the number of superconducting magnet coils 3 can be matched from 1 to 10, and the cooling time will be greatly reduced compared to full load.
[0043] A window is provided on the circumferential sidewall of the magnet liquid nitrogen cylinder 1 and the magnet cooling screen 4. The window is used to connect the conductive cooling system to the superconducting magnet coil 3. In order to reduce the evaporation of liquid nitrogen from the window and improve the heat preservation effect inside the magnet liquid nitrogen cylinder 1, a liquid nitrogen cylinder cooling screen 105 is further provided between the conductive cooling system and the window. The liquid nitrogen cylinder cooling screen 105 is a protruding part of the outer cylinder 46 of the cooling screen, which can play a role in conducting cold and also prevent liquid nitrogen from evaporating.
[0044] A vacuum port 106 is installed on the end face of the magnet Dewar 2. Vacuuming is performed before experiments or work, which further improves the heat preservation effect of the magnet liquid nitrogen cylinder 1 and reduces heat transfer.
[0045] A liquid nitrogen pouring port 107 is also provided on the top plate 92 of the Dewar installation. The liquid nitrogen pouring port 107 is connected to the inside of the liquid nitrogen cylinder through a pipe to realize the filling of liquid nitrogen.
[0046] For Example 1, the installation method of installing the superconducting magnet coil 3 into the magnet liquid nitrogen cylinder 1 includes: Step S1: The superconducting magnet coil 3 is modularly connected in series to form a high-temperature superconducting magnetofluid; Step S2: Pass the inner cylinder 12 of the liquid nitrogen cylinder 1 through the center of the high-temperature superconducting magnetohydrodynamic fluid; Step S3: The outer cylinder 13 of the liquid nitrogen cylinder 1 of the magnet liquid nitrogen cylinder 1 is sleeved on the outside of the high temperature superconducting magnetofluid, and the outer cylinder 13 of the liquid nitrogen cylinder containing the high temperature superconducting magnetofluid is placed horizontally as a whole; Step S4: Connect one end of the coil rod 66 to the high-temperature superconducting magnetofluid and the other end of the coil rod 66 to the outer cylinder 13 of the liquid nitrogen cylinder to fix the high-temperature superconducting magnetofluid in the magnet liquid nitrogen cylinder 1. Step S5: Weld the liquid nitrogen cylinder sealing plates 11 on both ends of the magnetic liquid nitrogen cylinder 1 to the inner liquid nitrogen cylinder 12 and the outer liquid nitrogen cylinder 13 of the magnetic liquid nitrogen cylinder 1.
[0047] It should be noted that in the accompanying drawings of this invention, Figure 1 , Figure 5 This is the front view of the entire refrigeration unit after installation. Figure 4 , Figure 8 From a top-down perspective, and combining the two perspectives mentioned above, it can be seen that the epoxy tie rod 5 and the aluminum alloy tie rod 6 are installed at an angle and are not absolutely perpendicular to the plane where the overall refrigeration unit is placed.
[0048] Furthermore, in a more specific embodiment, the implementation principle of the present invention is as follows: In a refrigeration system for high-temperature superconducting magnetohydrodynamic propulsion, the core support structure consists of several epoxy tie rods 5 and several titanium alloy tie rods 6. One end of each epoxy tie rod 5 is hinged to the end of the high-temperature superconducting magnetohydrodynamic storage device 1 via a connector such as a snap ring cylindrical pin kit (including snap pin), and connected to the epoxy tie rod base 51 located in the lower half of that end; the other end is hinged to the inner wall of the outer Dewar 2 of the refrigeration device via a slanted base 52, forming a symmetrical slanted tie rod structure, so that the epoxy tie rod mainly bears the axial compressive force during operation. To achieve thermal management, a dedicated tie rod heat sink 53 is provided on the side of the epoxy tie rod near the inner wall of the Dewar, which conducts the small amount of heat generated by the tie rod through the heat sink, reducing the thermal load at the low temperature end while actively monitoring and automatically adjusting micro-thermal changes. The epoxy tie rod body is made of glass fiber or carbon fiber impregnated with epoxy resin and then cured, possessing both high specific strength, low coefficient of thermal expansion, and extremely low thermal conductivity.
[0049] The titanium alloy tie rod 6 is hinged to the titanium alloy tie rod base 61 in the upper part of the high-temperature superconducting magnetohydrodynamic storage device. Its other end penetrates the side circumference of the outer Dewar 2 of the refrigeration device and is fixed to the outer cylinder 22 of the Dewar by the titanium alloy tie rod tailstock 62, forming a vertical suspension structure that primarily bears axial tensile force during operation. The titanium alloy material can incorporate rust-resistant and heat-resistant materials, possessing high strength, low thermal conductivity, and excellent corrosion resistance, and can maintain mechanical rigidity in a liquid nitrogen cryogenic environment.
[0050] The high-temperature superconducting magnetofluid storage device is itself a liquid nitrogen cylinder 1, which consists of a coaxially arranged inner liquid nitrogen cylinder 12 and outer cylinder 13, as well as two sealing plates 11. The sealing plates 11 have a circular through hole at their center, connecting the two ends of the inner liquid nitrogen cylinder to the outer cylinder; they also have threaded holes 7 and positioning holes 8 for fixing to the epoxy tie rod base 51 and titanium alloy tie rod base 61 respectively, ensuring that the tie rods maintain a symmetrical distribution under different working postures. To further reduce the magnet's thermal load, a magnet cooling screen 4 is fitted outside the liquid nitrogen cylinder. The cooling screen consists of an inner cylinder 44, an outer cylinder 46, and cooling screen cover plates 45 at both ends. The inner cooling screen cylinder passes through the center of the inner liquid nitrogen cylinder, completely surrounding the high-temperature superconducting magnetofluid.
[0051] The outer Dewar 2 adopts a magnetic Dewar structure, also coaxially assembled with an inner cylinder 21, an outer cylinder 22, and an end cap 23. The inner cylinder of the Dewar passes through the inner cylinder of the cold shield, achieving secondary vacuum insulation of the cold shield. The titanium alloy pull rod tailstock 62 is fixed on the outer cylinder 22 of the Dewar, and the inclined pull base 52 is embedded in the inner wall of the outer cylinder of the Dewar to achieve the inclined pull connection of the epoxy pull rod. Each of the two end faces of the high-temperature superconducting magnetohydrodynamic body is provided with a coil pull rod 66, which reliably connects the magnetohydrodynamic fluid to the outer cylinder 13 of the liquid nitrogen cylinder through the coil pull rod, forming a complete magnetohydrodynamic propulsion circuit.
[0052] After assembly, the epoxy tie rod is responsible for bearing the compressive load from the refrigeration unit and managing the heat through the heat sink, while the titanium alloy tie rod bears the tensile load from the electromagnetic force of the magnet. The two are symmetrically distributed at the upper and lower ends, forming a four-point symmetrical diagonal tie-suspension combination, which achieves the technical effects of high-strength support, low heat conduction and balanced thermal stress, and meets the reliable operation requirements of the high-temperature superconducting magnetohydrodynamic propulsion refrigeration unit in the cryogenic environment of liquid nitrogen.
[0053] In summary, the present invention provides a fixing assembly for a high-temperature superconducting magnetohydrodynamic propulsion refrigeration device, comprising: an epoxy tie rod 5, a titanium alloy tie rod 6, an epoxy tie rod base 51, a slanted tie base 52, a titanium alloy tie rod base 61, and a titanium alloy tie rod tailstock 62. The two ends of the epoxy tie rod 5 are respectively connected to the epoxy tie rod base 51 on the end face of the high-temperature superconducting magnetohydrodynamic storage device and the slanted tie base 52 welded to the inner wall of the outer Dewar of the refrigeration device, forming a symmetrical slanted tie rod structure. One end of the titanium alloy tie rod 6 is connected to the titanium alloy tie rod base 61 on the end face of the high-temperature superconducting magnetohydrodynamic storage device, and the other end penetrates the side circumferential surface of the magnet Dewar 2 and is fixed by the titanium alloy tie rod tailstock 62 provided on the side circumferential surface of the outer Dewar of the refrigeration device, forming a vertical hoisting structure. The above fixing assembly can simultaneously meet the requirements of mechanical reliability, resistance to huge electromagnetic forces, reduction of room temperature heat conduction, prevention of thermal deformation, refined management of low-temperature thermal stress, and reduction of operating energy consumption.
[0054] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0055] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.
Claims
1. A fixed assembly for a high-temperature superconducting magnetohydrodynamic propulsion cooling device, characterized in that, include: Multiple epoxy tie rods (5) and multiple titanium alloy tie rods (6); One end of the epoxy tie rod (5) is connected to the end of the high-temperature superconducting magnetohydrodynamic storage device, and the other end of the epoxy tie rod (5) is connected to the outer Dewar of the refrigeration device; One end of the titanium alloy rod (6) is connected to the end of the high-temperature superconducting magnetohydrodynamic storage device, and the other end of the titanium alloy rod (6) is connected to the outer Dewar of the refrigeration device; The two ends of the epoxy tie rod (5) are connected to the outer Dewar hinge of the high temperature superconducting magnetohydrodynamic storage device and the refrigeration device through the tie rod base; The two ends of the titanium alloy tie rod (6) are connected to the outer Dewar hinge of the high temperature superconducting magnetohydrodynamic storage device and the refrigeration device through the tie rod base; The plurality of epoxy tie rods (5) are uniformly subjected to axial compressive force, and the plurality of titanium alloy tie rods (6) are uniformly subjected to axial tensile force.
2. The fixing assembly of the high-temperature superconducting magnetohydrodynamic propulsion cooling device according to claim 1, characterized in that, The pull rod base of the high-temperature superconducting magnetohydrodynamic storage device includes a titanium alloy pull rod base (61) and an epoxy pull rod base (51), wherein the titanium alloy pull rod (6) and the epoxy pull rod (5) are respectively hinged to the titanium alloy pull rod base (61) and the epoxy pull rod base (51); When the high-temperature superconducting magnetofluid storage device is placed horizontally, the titanium alloy tie rod base (61) is distributed on the upper half of the end face of the high-temperature superconducting magnetofluid storage device, and the epoxy tie rod base (51) is distributed on the lower half of the end face of the high-temperature superconducting magnetofluid storage device. The titanium alloy tie rod base (61) and the epoxy tie rod base (51) are respectively distributed symmetrically to the multiple epoxy tie rods (5) and the multiple titanium alloy tie rods (6).
3. The fixing assembly of the high-temperature superconducting magnetohydrodynamic propulsion cooling device according to claim 2, characterized in that, The epoxy tie rod (5) is hinged to the inner wall of the outer Dewar of the refrigeration device via the inclined base (52); The two ends of the epoxy tie rod (5) are connected to the epoxy tie rod base (51) and the inclined tie base (52) respectively to form a symmetrical inclined tie rod structure, so that the epoxy tie rod (5) can bear axial compressive force.
4. The fixing assembly of the high-temperature superconducting magnetohydrodynamic propulsion cooling device according to claim 3, characterized in that, The titanium alloy tie rod (6) is hinged to the side circumferential surface of the outer Dewar of the refrigeration device via the titanium alloy tie rod tailstock (62); One end of the titanium alloy tie rod (6) penetrates the side circumference of the outer Dewar of the refrigeration device and is fixed by the titanium alloy tie rod tail seat (62); the two ends of the titanium alloy tie rod (6) are respectively connected to the titanium alloy tie rod base (61) and the titanium alloy tie rod tail seat (62) to form a vertical hoisting structure, so that the titanium alloy tie rod (6) can bear axial tensile force.
5. The fixing assembly of the high-temperature superconducting magnetohydrodynamic propulsion cooling device according to claim 1, characterized in that, The epoxy tie rod (5) is provided with a tie rod heat sink (53) on the side near the outer Dewar of the refrigeration device, and the tie rod heat sink (53) is used for the thermal management of the epoxy tie rod (5).
6. The fixing assembly of the high-temperature superconducting magnetohydrodynamic propulsion cooling device according to claim 2, characterized in that, The epoxy tie rod (5) is formed by impregnating glass fiber or carbon fiber with epoxy resin and then curing it; the epoxy tie rod base (51) is secured by a locking pin. The snap ring cylindrical pin assembly is hinged to the epoxy tie rod (5).
7. The fixing assembly of the high-temperature superconducting magnetohydrodynamic propulsion cooling device according to claim 4, characterized in that, The high-temperature superconducting magnetohydrodynamic storage device is a magnetic liquid nitrogen cylinder (1). The magnetic liquid nitrogen cylinder (1) includes: a liquid nitrogen inner cylinder (12) and a liquid nitrogen outer cylinder (13) arranged coaxially, and two liquid nitrogen cylinder sealing plates (11); a circular through hole is opened in the center of the liquid nitrogen cylinder sealing plate (11), and after assembly, the circular through holes on the two liquid nitrogen cylinder sealing plates (11) are respectively connected to the two ends of the liquid nitrogen inner cylinder (12), and the outer circumference of the two liquid nitrogen cylinder sealing plates (11) are respectively connected to the two ends of the liquid nitrogen outer cylinder (13); A threaded hole (7) and a positioning hole (8) are provided on the magnetic liquid nitrogen cylinder sealing plate (11), and the pull rod base is fixed by the cooperation of the threaded hole (7) and the positioning hole (8).
8. The fixing assembly of the high-temperature superconducting magnetohydrodynamic propulsion cooling device according to claim 7, characterized in that, Also includes: Magnetic cooling screen (4); The magnet cold screen (4) includes: a cold screen inner cylinder (44) and a cold screen outer cylinder (46) arranged coaxially, and cold screen cover plates (45) located at both ends of the magnet cold screen (4). The cold screen inner cylinder (44) passes through the center of the liquid nitrogen cylinder inner cylinder (12). The cold screen inner cylinder (44), cold screen outer cylinder (46), and cold screen cover plate (45) are combined to surround the high-temperature superconducting magnetofluid.
9. The stationary assembly of the high-temperature superconducting magnetohydrodynamic propulsion cooling device according to claim 8, characterized in that, The outer Dewar of the refrigeration device is a magnetic Dewar (2). The magnet Dewar (2) includes: a Dewar inner cylinder (21) and a Dewar outer cylinder (22) arranged coaxially, and two Dewar end caps (23); the Dewar inner cylinder (21) passes through the center of the cold screen inner cylinder (44), and the Dewar inner cylinder (21), the Dewar outer cylinder (22) and the Dewar end caps (23) together surround the magnet cold screen (4); The titanium alloy pull rod tailstock (62) is mounted on the outer cylinder (22) of the Dewar, and the inclined pull base (52) is mounted on the inner wall of the outer cylinder (22); The titanium alloy tie rod (6) penetrates the Dewar outer cylinder (22) and is connected to the titanium alloy tie rod tailstock (62).
10. The fixing assembly of the high-temperature superconducting magnetohydrodynamic propulsion cooling device according to claim 9, characterized in that, Coil rods (66) are provided on both end faces of the high-temperature superconducting magnetofluid, and the high-temperature superconducting magnetofluid is connected to the outer cylinder (13) of the liquid nitrogen cylinder through the coil rods (66).