High-temperature superconducting maglev train

Abstract

The invention relates to a high-temperature superconducting maglev train which comprises a train body, permanent magnet rails and sleepers, the bottom of the train body is connected with a suspension frame through a central traction pin arranged in the middle and shock absorbers arranged at the two ends, suspension Dewares are arranged on the two sides of the bottom of the suspension frame respectively, and the suspension Dewares on the two sides are located over the corresponding permanent magnet rails respectively; a high-temperature superconducting block is arranged at the bottom of the inner side of the suspension Dewar, the high-temperature superconducting block is composed of a plurality of same high-temperature superconducting block units, and the sum of the width of a single horizontal magnetized permanent magnet and the width of a single vertical magnetized permanent magnet of the permanent magnet track is equal to the width of a single high-temperature superconducting block unit; and the seed crystal of each high-temperature superconducting block unit is positioned right above the center of the vertical magnetized permanent magnet of the permanent magnet track, so that the system can obtain suspension force equivalent to that of the large-size high-temperature superconducting block, the suspension bearing capacity of the high-temperature superconducting maglev train is effectively improved, the limitation of insufficient large-size high-temperature superconducting block batch preparation technology is avoided, and the production efficiency is improved. And meanwhile, the system cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic levitation trains, and in particular to a high-temperature superconducting magnetic levitation train. Background Art

[0002] Leveraging the diamagnetic and flux pinning properties of high-temperature superconducting materials in applied external fields, high-temperature superconducting maglev trains achieve self-stabilizing levitation and guidance, boasting advantages such as simple structure, energy conservation, and environmental friendliness, while also enabling ultra-high-speed operation. The core components of high-temperature superconducting maglev trains include high-temperature superconducting bulk materials and permanent magnet tracks. In large-scale applications, single-seed cylindrical superconducting bulk materials with a diameter of 30 mm and a thickness of 20 mm (from the Beijing Research Institute of Nonferrous Metals) and three-seed rectangular bulk materials with dimensions of 64 mm × 32 mm × 13 mm (from ATZ, Germany) have been put to practical use. From the first manned high-temperature superconducting maglev train, the Century, to the high-temperature superconducting maglev train in Brazil, to the high-temperature superconducting maglev engineering prototype rolled off the production line at Southwest Jiaotong University, larger HTS bulk materials have demonstrated improved levitation and load-bearing performance. However, due to limitations in the mass production technology for large-scale HTS bulk materials, bulk size has become a bottleneck in improving the levitation and load-bearing performance of high-temperature superconducting maglev trains. At present, based on the bipolar Halbach permanent magnet track, the literature (IEEE Trans. Appl. Supercond., 2015, 25 (1): 3600106) makes a 64mm × 32mm × 12mm three-seed YBa2Cu3O 7-x The levitation force density (levitation force per unit area) of the (YBCO) high-temperature superconducting bulk material at a field cooling height (FCH) of 30 mm and a working height (WH) of 10 mm reached 4.05 N / cm 2 . Summary of the Invention

[0003] In order to break through the bottleneck that the suspension bearing performance of high-temperature superconducting maglev trains is limited by the size of high-temperature superconducting blocks, the present invention provides a high-temperature superconducting maglev train, which can enable the system to obtain a suspension force equivalent to that of a whole large-sized high-temperature superconducting block, thereby improving the suspension bearing capacity of the high-temperature superconducting maglev train.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A high-temperature superconducting maglev train comprises a car body, a permanent magnet track and a sleeper. The permanent magnet track is located on both sides of the sleeper and is laid along the track. The bottom of the car body is connected to the suspension frame through a central traction pin arranged in the middle and shock absorbers arranged at both ends. A linear motor primary is arranged in the middle of the bottom of the suspension frame. Suspension dewars are respectively arranged on both sides of the bottom of the suspension frame. The suspension dewars on both sides are respectively located directly above the corresponding permanent magnet track. A linear motor secondary is laid along the middle of the track. The linear motor secondary is located at the bottom of the suspension frame. Directly below; a high-temperature superconducting block is arranged at the bottom inner side of the suspension dewar, and the high-temperature superconducting block is composed of multiple identical high-temperature superconducting block units. The sum of the width of a single horizontally magnetized permanent magnet and a single vertically magnetized permanent magnet of the permanent magnet track is equal to the width of a single high-temperature superconducting block unit, and the seed crystal of each high-temperature superconducting block unit is located directly above the center of the vertically magnetized permanent magnet of the permanent magnet track, so that the system obtains a suspension force equivalent to that of a whole large-sized high-temperature superconducting block, breaking through the bottleneck that the suspension bearing performance of the high-temperature superconducting maglev train is limited by the size of the high-temperature superconducting block.

[0005] Furthermore, a track support beam for supporting the permanent magnet track is provided on the sleeper.

[0006] Furthermore, rails are laid along both sides of the line, and support wheels and guide wheels are provided on both sides of the bottom of the suspension frame. The support wheels are rollingly connected to the top surface of the corresponding rails, and the guide wheels are rollingly connected to the outer side surface of the corresponding rails.

[0007] Furthermore, the support wheels and guide wheels are made of stainless steel or nylon.

[0008] Furthermore, the suspended dewar cools the high-temperature superconducting block by using a single refrigeration method such as injection of liquid nitrogen, low-pressure treatment, refrigerator refrigeration, or a combination of any two or more refrigeration methods.

[0009] Furthermore, the secondary of the linear motor is a single material or composite material metal conductive plate of aluminum, copper, iron, a single combination structure of permanent magnets, electromagnets, superconducting wire (block) magnets, or a combination structure of any two or more; the primary of the linear motor is a three-phase winding with an iron core or a hollow core.

[0010] Furthermore, the vehicle body and suspension frame are constructed using a single material selected from light aluminum alloy, carbon fiber plate (tube, cloth), and steel, or any two or more materials.

[0011] Furthermore, the shock absorber is a single structure of a mechanical shock absorber, an air shock absorber, an oil pressure shock absorber, a magnetic suspension shock absorber, or a combination structure of any two or more of them.

[0012] Furthermore, the sleepers are manufactured by using wooden sleepers, steel sleepers, prefabricated concrete or on-site casting.

[0013] Furthermore, the high temperature superconducting block is ReBa2Cu3O 7-x A single combination structure or a combination structure of any two or more superconducting materials with other superconducting materials, including bulk materials, tape stacks, wire (tape) coils, wherein Re is a rare earth element.

[0014] Furthermore, the permanent magnetic track is a single magnet combination structure of a permanent magnet, an electromagnet, a superconducting wire (belt) coil magnet, or a combination structure of any two or more.

[0015] Furthermore, when the permanent magnetic track is assembled using permanent magnets, its transverse structure is arranged according to a Halbach array.

[0016] The beneficial effects of the present invention are: The present invention implements a specific combination design of high-temperature superconducting bulk material units of limited size, enabling the system to obtain a suspension force equivalent to that of large-sized high-temperature superconducting bulk materials, effectively improving the suspension carrying capacity of the high-temperature superconducting maglev train, avoiding the limitations of insufficient batch preparation technology for large-sized high-temperature superconducting bulk materials, and at the same time reducing system costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic structural diagram of a high-temperature superconducting maglev train according to the present invention; Figure 2 This is a schematic diagram of the longitudinal cross-section structure of the high-temperature superconducting maglev train of the present invention; Figure 3 This is a schematic diagram of the structure of the three-pole Halbach permanent magnet track-high-temperature superconducting maglev system; Figure 4 Schematic diagram of the induced current distribution of the three-unit high-temperature superconducting block under the conditions of FCH30mm and WH5mm; Figure 5 Schematic diagram of the induced current distribution of the entire high-temperature superconducting block under the conditions of FCH30mm and WH5mm; Figure 6 The suspension force curves of the three units and the whole high-temperature superconductor block under FCH20mm conditions; Figure 7 The suspension force curves of the three units and the whole high-temperature superconductor block under FCH25mm conditions; Figure 8 The suspension force curves of the three units and the whole high-temperature superconductor block under FCH30mm conditions; Figure 9 The suspension force curves of the three units and the whole high-temperature superconductor block under FCH35mm conditions; Figure 10The suspension force curves of the three units and the whole high-temperature superconductor block under FCH40mm conditions; Figure 11 These are the suspension force curves of the three units and the entire high-temperature superconductor block under FCH60mm conditions. DETAILED DESCRIPTION

[0018] like Figure 1-11 As shown, a high-temperature superconducting maglev train of the present invention includes a car body 1, a permanent magnet track 7 and a sleeper 8. The permanent magnet track 7 is located on both sides of the sleeper 8 and laid along the track, wherein a track support beam 14 for supporting the permanent magnet track 7 is provided on the sleeper 8.

[0019] The bottom of the vehicle body 1 is connected to the suspension frame 4 through a central traction pin 2 arranged in the middle and shock absorbers 3 arranged at both ends. A linear motor primary 12 is arranged in the middle of the bottom of the suspension frame 4, and suspension dewars 5 are respectively arranged on both sides of the bottom of the suspension frame 4. The suspension dewars 5 on both sides are respectively located directly above the corresponding permanent magnet tracks 7; a linear motor secondary 13 is laid along the middle of the line, and the linear motor secondary 13 is located directly below the linear motor primary 12 at the bottom of the suspension frame 4.

[0020] Rails 11 are laid along both sides of the line, and support wheels 9 and guide wheels 10 are provided on both sides of the bottom of the suspension frame 4. The support wheels 9 are rollingly connected to the top surface of the corresponding rails 11, and the guide wheels 10 are rollingly connected to the outer side surface of the corresponding rails 11.

[0021] A high-temperature superconducting block 6 is located at the inner bottom of the levitation dewar 5. This block 6 is composed of multiple identical units. The sum of the widths of a single horizontally magnetized permanent magnet 16 and a single vertically magnetized permanent magnet 17 on the permanent magnet track 7 is equal to the width of a single unit of the high-temperature superconducting block 6. Furthermore, the seed crystal 15 of each unit of the high-temperature superconducting block 6 is located directly above the center of the vertically magnetized permanent magnet 17 on the permanent magnet track 7. This enables the system to achieve a levitation force equivalent to that of a single large-scale high-temperature superconducting block 6, breaking through the bottleneck of the high-temperature superconducting maglev train's levitation load-bearing performance being limited by the size of the high-temperature superconducting block 6. The levitation force density reaches 1.46N / cm2 under FCH20mm conditions. 2 @WH15mm and 4.71N / cm 2 @WH10mm, FCH25mm under the conditions of suspension force density reached 2.33N / cm 2 @WH15mm and 5.7N / cm 2 @WH10mm, FCH30mm conditions, the suspension force density reaches 2.87N / cm 2 @WH15mm and 6.33N / cm 2 @WH10mm, FCH35mm under the conditions of suspension force density reached 3.22N / cm 2@WH15mm and 6.75N / cm 2 @WH10mm, FCH40mm under the conditions of suspension force density reached 3.46N / cm 2 @WH15mm and 7.03N / cm 2 @WH10mm, FCH60mm under the conditions of suspension force density reached 3.87N / cm 2 @WH15mm and 7.53N / cm 2 @WH10mm, breaking through the bottleneck that the suspension bearing performance of high-temperature superconducting maglev train is limited by the size of high-temperature superconducting block 6.

[0022] Preferably, the high temperature superconducting block 6 unit is a single seed crystal square YBa2Cu3O with a size of 40mm×40mm×16mm. 7-x Block material.

[0023] Preferably, the cross-sectional structure of the permanent magnet combination arrangement structure of the permanent magnet track 7 is composed of 7 magnets whose magnetization directions are horizontally to the right, vertically upward, horizontally to the left, vertically downward, horizontally to the right, vertically upward, and horizontally to the left, arranged in a Halbach array.

[0024] Preferably, the suspension Dewar 5 cools the high-temperature superconducting block 6 by injecting liquid nitrogen.

[0025] Preferably, the secondary 13 of the linear motor is made of 5 mm thick industrial pure aluminum; the primary 12 of the linear motor is a single-layer full-pitch three-phase winding with an iron core.

[0026] Preferably, the vehicle body 1 and the suspension frame 4 are constructed using a single material or any two or more materials selected from light aluminum alloy, carbon fiber plate (tube, cloth), and steel.

[0027] Preferably, the shock absorber 3 is an air shock absorber.

[0028] Preferably, the sleeper 8 is made of steel sleeper.

[0029] Preferably, the support wheel 9 and the guide wheel 10 are ball bearings made of stainless steel.

[0030] The present invention achieves a suspension force equivalent to that of a large-sized high-temperature superconducting block 6 by specifically combining and designing high-temperature superconducting block 6 material units of a limited size, thereby effectively improving the suspension carrying capacity of a high-temperature superconducting maglev train, making up for the problem of insufficient batch production technology of large-sized high-temperature superconducting block 6 materials, and reducing system costs.

[0031] The above describes a specific embodiment of the present invention, but those skilled in the art should understand that this is only an example. Those skilled in the art can make various changes or modifications to this embodiment without departing from the principles and essence of the present invention, but these changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A high-temperature superconducting maglev train, comprising a car body, a permanent magnetic track and a sleeper, wherein the permanent magnetic track is located on both sides of the sleeper and laid along the track, characterized in that: The bottom of the vehicle body is connected to the suspension frame through a central traction pin arranged in the middle and shock absorbers arranged at both ends. A linear motor primary is arranged in the middle of the bottom of the suspension frame, and suspension dewars are arranged on both sides of the bottom of the suspension frame, and the suspension dewars on both sides are respectively located directly above the corresponding permanent magnet tracks; a linear motor secondary is laid along the middle of the line, and the linear motor secondary is located directly below the linear motor primary at the bottom of the suspension frame; a high-temperature superconducting block is arranged at the bottom of the inner side of the suspension dewar, and the high-temperature superconducting block is composed of multiple identical high-temperature superconducting block units, the sum of the width of a single horizontally magnetized permanent magnet and the width of a single vertically magnetized permanent magnet of the permanent magnet track is equal to the width of a single high-temperature superconducting block unit, and the seed crystal of each high-temperature superconducting block unit is located directly above the center of the vertically magnetized permanent magnet of the permanent magnet track.

2. A high temperature superconducting maglev train according to claim 1, characterized in that: The sleeper is provided with a track support beam for supporting the permanent magnetic track.

3. A high temperature superconducting maglev train according to claim 1, characterized in that: Rails are laid along both sides of the line, and support wheels and guide wheels are respectively provided on both sides of the bottom of the suspension frame. The support wheels are rollingly connected to the top surface of the corresponding rails, and the guide wheels are rollingly connected to the outer side surface of the corresponding rails.

4. A high temperature superconducting maglev train according to claim 3, characterized in that: The supporting wheel and the guide wheel are made of stainless steel or nylon.

5. A high temperature superconducting maglev train according to claim 1, characterized in that: The suspended dewar cools the high temperature superconducting block by a single refrigeration method such as injection of liquid nitrogen, low pressure treatment, refrigerator refrigeration, or a combination of any two or more refrigeration methods.

6. A high temperature superconducting maglev train according to claim 1, characterized in that: The secondary of the linear motor is a single material of aluminum, copper, iron or a composite material metal conductive plate, a permanent magnet, an electromagnet, a superconducting wire magnet or a combination of any two or more; the primary of the linear motor is a three-phase winding with an iron core or a hollow core.

7. A high temperature superconducting maglev train according to claim 1, characterized in that: The vehicle body and suspension frame are constructed of a single material selected from light aluminum alloy, carbon fiber plate, and steel, or any two or more materials.

8. A high temperature superconducting maglev train according to claim 1, characterized in that: The shock absorber is a single structure of a mechanical shock absorber, an air shock absorber, an oil pressure shock absorber, a magnetic suspension shock absorber, or a combination structure of any two or more of them.

9. A high temperature superconducting maglev train according to claim 1, characterized in that: The sleepers are manufactured by using wooden sleepers, steel sleepers, prefabricated concrete or on-site casting.

10. A high temperature superconducting maglev train according to claim 1, characterized in that: When the permanent magnetic track is assembled using permanent magnets, its transverse structure is arranged according to the Halbach array.

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