A kind of sleeve shaft counter-rotating experimental device

Abstract

The application discloses a sleeve shaft counter-rotation experimental device, and relates to the technical field of electric suspension, which comprises a first rotating shaft, a first driving mechanism, a second rotating shaft and a second driving mechanism. The first rotating shaft is connected with a first rotating disc. The first driving mechanism is connected with the first rotating shaft and is used for driving the first rotating shaft and the first rotating disc to rotate. The second rotating shaft is nested on the first rotating shaft and is connected with a second rotating disc. The second rotating disc is arranged opposite to the first rotating disc. The second driving mechanism is connected with the second rotating shaft and is used for driving the second rotating shaft and the second rotating disc to rotate. The sleeve shaft counter-rotation experimental device can realize permanent magnet electric suspension performance test in a compact and high relative speed mode in a limited laboratory space.

Description

Technical Field

[0001] This application relates to the field of electric levitation technology, and in particular to a sleeve-shaft counter-rotation experimental device. Background Technology

[0002] When conducting high-speed performance tests of permanent magnet electric levitation, in order to obtain a relative speed of 500 to 600, a scheme of two components rotating in opposite directions is usually adopted to increase the relative rotation speed by multiple times, thereby verifying the physical law that the higher the speed, the greater the levitation force and the smaller the resistance.

[0003] Given the experimental principles described above, achieving high-speed operation with a single rotating disk presents two challenges: firstly, the disk's rotational speed is extremely high; secondly, the disk's diameter is very large. Both of these conditions place high demands on the power and safety of the drive equipment. Therefore, the current common approach is to use a dual-disc counter-rotating configuration, where two independent shafts are arranged vertically or horizontally, each driven by a separate drive system, but in opposite directions. Because two independent drive systems are required, two motors, two sets of bearing housings, and corresponding support frames are needed, effectively doubling the axial / radial space required.

[0004] Therefore, how to conduct permanent magnet electric levitation performance tests in a compact and high relative speed manner within a limited laboratory space is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide a rotating shaft test apparatus that enables permanent magnet electric levitation performance testing in a compact and high relative speed manner within a limited laboratory space.

[0006] To achieve the above objectives, this application provides a sleeve-shaft counter-rotation experimental apparatus, comprising:

[0007] The first rotating shaft is connected to the first rotating disk;

[0008] The first drive mechanism is connected to the first rotating shaft and is used to drive the first rotating shaft and the first rotating disk to rotate.

[0009] The second rotating shaft is nested on the first rotating shaft and connected to the second rotating disk, which is positioned opposite to the first rotating disk;

[0010] The second drive mechanism is connected to the second rotating shaft and is used to drive the second rotating shaft and the second rotating disk to rotate.

[0011] In some embodiments, the sleeve shaft counter-rotation experimental device further includes a first support mechanism, a second support mechanism, and a third support mechanism. The first support mechanism, the second support mechanism, and the third support mechanism are arranged sequentially along the direction close to the first drive mechanism. The first support mechanism is used to support the end of the first rotating shaft away from the first drive mechanism, the second support mechanism is used to support the end of the second rotating shaft close to the second rotating disk, and the third support mechanism is used to support the end of the first rotating shaft close to the first drive mechanism and the end of the second rotating shaft away from the second rotating disk.

[0012] In some embodiments, the first support mechanism includes:

[0013] The first bearing housing is used to connect the frame;

[0014] The first bearing assembly is built into the first bearing housing and connected to the end of the first rotating shaft away from the first drive mechanism;

[0015] The first bearing cover is located on the first bearing housing.

[0016] In some embodiments, the first bearing assembly includes:

[0017] A first deep groove ball bearing with a dust cover is used to decouple the movement of a first rotating shaft relative to a first bearing housing.

[0018] A one-way thrust ball bearing is disposed between a first deep groove ball bearing and a first bearing cap, used to support a first rotating shaft and decouple the movement of the first rotating shaft relative to the first bearing housing.

[0019] In some embodiments, the second support mechanism includes:

[0020] The second bearing housing is used to connect the frame;

[0021] The second bearing assembly is built into the second bearing housing and connected to the end of the second rotating shaft near the second rotating disk;

[0022] The second bearing cover is located on the second bearing housing.

[0023] In some embodiments, the second bearing assembly includes:

[0024] A thrust ball bearing is used to support the second rotating shaft and decouple the movement of the second rotating shaft relative to the second bearing housing.

[0025] A single-row deep groove ball bearing, located between the thrust ball bearing and the second bearing cap, is used to decouple the movement of the second rotating shaft relative to the second bearing housing.

[0026] In some embodiments, the third support mechanism includes:

[0027] The third bearing housing is used to connect the frame;

[0028] The third bearing assembly is built into the third bearing housing and is connected to the end of the first rotating shaft near the first drive mechanism and the end of the second rotating shaft away from the second rotating disk.

[0029] The third bearing cover is located at one end of the third bearing housing near the second support mechanism;

[0030] The fourth bearing cover is located at the end of the third bearing housing away from the second support mechanism.

[0031] In some embodiments, the third bearing assembly includes:

[0032] The second deep groove ball bearing is used to decouple the movement of the second rotating shaft relative to the third bearing housing;

[0033] A pair of angular contact ball bearings, located between the second deep groove ball bearing and the fourth bearing cap, are used to decouple the movement of the first rotating shaft relative to the third bearing housing.

[0034] In some embodiments, the second drive mechanism includes:

[0035] The first transmission wheel is mounted on the second rotating shaft;

[0036] The second transmission wheel is connected to the first transmission wheel, and the axis of rotation of the second transmission wheel is parallel to the axis of rotation of the first transmission wheel.

[0037] The second driving component is connected to the second transmission wheel and is used to drive the second transmission wheel to rotate, so that the first transmission wheel and the second rotating shaft rotate.

[0038] In some embodiments, the sleeve-shaft counter-rotation experimental apparatus further includes a rotary seal disposed between the first rotating shaft and the second rotating shaft, for forming a vacuum sealing cavity between the first rotating shaft and the second rotating shaft.

[0039] Compared to the aforementioned background technology, the rotating test apparatus provided in this application includes a first rotating shaft, a first driving mechanism, a second rotating shaft, and a second driving mechanism. The first rotating shaft is connected to a first rotating disk; the first driving mechanism is connected to the first rotating shaft and drives the first rotating shaft and the first rotating disk to rotate; the second rotating shaft is nested on the first rotating shaft and connected to the second rotating disk, the second rotating disk being positioned opposite to the first rotating disk; the second driving mechanism is connected to the second rotating shaft and drives the second rotating shaft and the second rotating disk to rotate.

[0040] The advantages of this counter-rotating experimental device with its rotating shafts include: By using two separate drive mechanisms to drive the dual rotating disks in a counter-rotating manner, higher relative speeds can be achieved with a relatively small disk radius, and higher standards of experimental performance can be met. Furthermore, by directly mounting the second rotating shaft onto the outer wall of the first rotating shaft, with both shafts sharing the same geometric centerline, the lateral / longitudinal span required by traditional left-right / up-down dual-axis designs is eliminated. This reduces the overall size from dual-axis to single-axis, minimizing space requirements and achieving a highly compact design. This allows for a more compact structural design within limited experimental spaces, making it particularly suitable for limited laboratory spaces. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0042] Figure 1 This is a front view of the shaft-rotation experimental apparatus in the embodiments of this application.

[0043] Figure 2 This is a top view of the shaft-rotation experimental apparatus in the embodiments of this application.

[0044] Figure 3 for Figure 1 A sectional view of DD.

[0045] Figure 4 for Figure 3 A magnified view of part A in the middle.

[0046] Figure 5 for Figure 3 A magnified view of part B in the middle.

[0047] Figure 6 for Figure 3 A magnified view of part C in the middle.

[0048] in:

[0049] 10 - First rotation axis;

[0050] 20 - First rotating disk; 21 - Spline base;

[0051] 30-First drive mechanism, 31-First drive component, 32-Coupling;

[0052] 40 - Second rotation axis;

[0053] 50 - Second rotating disk;

[0054] 60 - Second drive mechanism; 61 - First transmission wheel; 62 - Second transmission wheel; 63 - Second drive component;

[0055] 70-First support mechanism, 71-First bearing housing, 72-First bearing assembly, 721-First deep groove ball bearing, 722-One-way thrust ball bearing, 73-First bearing cover;

[0056] 80-Second support mechanism, 81-Second bearing housing, 82-Second bearing assembly, 821-Thrust ball bearing, 822-Single row deep groove ball bearing, 83-Second bearing cap;

[0057] 90-Third support mechanism, 91-Third bearing housing, 92-Third bearing assembly, 921-Second deep groove ball bearing, 922-Angular contact ball bearing, 93-Third bearing cover, 94-Fourth bearing cover. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0060] It should be noted that the directional terms such as "upper end," "lower end," "left side," and "right side" mentioned below are defined based on the accompanying drawings in the instruction manual.

[0061] Please refer to Figures 1 to 6 , Figure 1 This is a front view of the shaft-rotation experimental apparatus in the embodiments of this application. Figure 2 This is a top view of the shaft-rotation experimental apparatus in the embodiments of this application. Figure 3 for Figure 1 A sectional view of DD. Figure 4 for Figure 3 A magnified view of part A in the middle. Figure 5 for Figure 3 A magnified view of part B in the middle. Figure 6 for Figure 3 A magnified view of part C in the middle.

[0062] The sleeve-shaft counter-rotation experimental device provided in this application embodiment includes a first rotating shaft 10, a first driving mechanism 30, a second rotating shaft 40, and a second driving mechanism 60.

[0063] The first rotating shaft 10 is connected to the first rotating disk 20; the first driving mechanism 30 is connected to the first rotating shaft 10 and is used to drive the first rotating shaft 10 and the first rotating disk 20 to rotate; the second rotating shaft 40 is nested on the first rotating shaft 10 and connected to the second rotating disk 50, the second rotating disk 50 being arranged opposite to the first rotating disk 20; the second driving mechanism 60 is connected to the second rotating shaft 40 and is used to drive the second rotating shaft 40 and the second rotating disk 50 to rotate.

[0064] The first rotating disk 20 can be a permanent magnet disk, which has mounting holes for installing permanent magnets with different parameters. The mounting holes are arranged in a ring matrix, and each mounting hole contains a detachable permanent magnet fixing module that can accommodate permanent magnets of different sizes. Specifically, the permanent magnet disk is made of aluminum and has grooves and fixing bolt holes with different spacings on its outer side, which can be used to install permanent magnet arrays of different sizes and parameters. By replacing permanent magnet arrays with different parameters, the influence of permanent magnets of different sizes and parameters on the electromagnetic force of the system can be simulated in the experiment. The second rotating disk 50 is an induction disk, which is made of a non-ferromagnetic benign conductor. The induction disk and the track material of the permanent magnet electric levitation system are the same, generally made of aluminum. The rotating benign conductor cuts the magnetic lines of force released by the permanent magnet disk, which can induce eddy currents inside the induction disk. The interaction between the eddy currents and the permanent magnet material will generate electromagnetic force (also known as levitation force).

[0065] With this configuration, this application drives the dual rotating disks through two separate drive mechanisms, employing a counter-rotating form. This allows for higher relative speeds and more stringent experimental requirements to be achieved within a relatively small disk radius design. Furthermore, the second rotating shaft 40 is directly fitted onto the outer wall of the first rotating shaft 10, with both shafts sharing the same geometric centerline. This eliminates the need for the lateral / longitudinal span required by traditional left-right / up-down dual-axis designs, reducing the overall size from dual-axis to single-axis, minimizing space requirements, and achieving a highly compact design. This enables a more compact structural design within limited experimental spaces, making it particularly suitable for limited laboratory spaces.

[0066] In some embodiments, the first drive mechanism 30 includes a first drive member 31 and a coupling 32. Specifically, the first drive member 31 is a first drive motor. The output shaft of the first drive motor is connected to one end of the coupling 32, and the other end of the coupling 32 is connected to a first rotating shaft 10 (which is an inner shaft). The first rotating shaft 10 is equipped with a splined shaft and is connected to the first rotating disk 20 through a splined seat 21, thereby completing the drive form.

[0067] In some embodiments, the second drive mechanism 60 includes a first drive wheel 61, a second drive wheel 62, and a second drive member 63. The first drive wheel 61 is mounted on the second rotating shaft 40, and the second drive wheel 62 is connected to the first drive wheel 61 via a synchronous belt (e.g., the axis of rotation of the second drive wheel 62 is parallel to the axis of rotation of the first drive wheel 61). The second drive member 63 is connected to the second drive wheel 62 and drives the second drive wheel 62 to rotate, thereby causing the first drive wheel 61 and the second rotating shaft 40 to rotate.

[0068] Specifically, the second driving component 63 is a second driving motor, the first transmission wheel 61 is a hollow shaft pulley, the second transmission wheel 62 is a driving pulley, the output shaft of the side-mounted second driving motor is connected to the driving pulley, and the driving pulley drives the hollow shaft pulley sleeved on the second rotating shaft 40 (which is the outer shaft) through a synchronous belt drive. The hollow shaft pulley is fixed to the second rotating shaft 40 and directly drives the outer hollow shaft. The outer hollow shaft is connected to the lower rotating disk (second rotating disk 50), thereby driving the second rotating disk 50 to rotate.

[0069] In this way, the main structure consists of two drive motors that drive two nested drive shafts via direct drive through couplings and synchronous belt transmission, respectively. The two drive shafts are connected to two sets of rotating disks, one above the other. By designing the driving direction of the two drive motors, the two rotating disks can rotate in opposite directions to achieve a higher relative speed.

[0070] In some embodiments, the sleeve shaft counter-rotation experimental device further includes a first support mechanism 70, a second support mechanism 80, and a third support mechanism 90. The first support mechanism 70, the second support mechanism 80, and the third support mechanism 90 are arranged sequentially along the direction close to the first drive mechanism 30. The first support mechanism 70 is used to support the end of the first rotating shaft 10 away from the first drive mechanism 30, the second support mechanism 80 is used to support the end of the second rotating shaft 40 close to the second rotating disk 50, and the third support mechanism 90 is used to support the end of the first rotating shaft 10 close to the first drive mechanism 30 and the end of the second rotating shaft 40 away from the second rotating disk 50.

[0071] The three auxiliary structures—first support mechanism 70, second support mechanism 80, and third support mechanism 90—are generally similar, mainly consisting of three categories: bearing housing, bearing cap, and various bearing combinations. The structures of the first support mechanism 70, second support mechanism 80, and third support mechanism 90 are described in detail below:

[0072] The first support mechanism 70 includes a first bearing housing 71, a first bearing assembly 72, and a first bearing cover 73. The first bearing housing 71 is used to connect the frame; the first bearing assembly 72 is built into the first bearing housing 71 and connected to the end of the first rotating shaft 10 away from the first drive mechanism 30; the first bearing cover 73 is disposed on the first bearing housing 71.

[0073] The first bearing assembly 72 includes a first deep groove ball bearing 721 with a dust cover and a one-way thrust ball bearing 722. The first deep groove ball bearing 721 is used to decouple the movement of the first rotating shaft 10 relative to the first bearing housing 71. The one-way thrust ball bearing 722 is disposed between the first deep groove ball bearing 721 and the first bearing cover 73. The one-way thrust ball bearing 722 is used to bear the weight of the first rotating shaft 10 and the connected accessories, and to decouple the movement of the first rotating shaft 10 relative to the first bearing housing 71.

[0074] It should be noted that decoupling refers to separating the motions / forces that would otherwise interfere with each other, allowing each to assume only its own degree of freedom. In other words, the first rotating shaft 10 achieves independent operation relative to the first bearing housing 71 through bearings.

[0075] The second support mechanism 80 includes a second bearing seat 81, a second bearing assembly 82, and a second bearing cover 83. The second bearing seat 81 is used to connect the frame; the second bearing assembly 82 is built into the second bearing seat 81 and connected to one end of the second rotating shaft 40 near the second rotating disk 50; the second bearing cover 83 is disposed on the second bearing seat 81.

[0076] The second bearing assembly 82 includes a thrust ball bearing 821 and a single-row deep groove ball bearing 822. The thrust ball bearing 821 is used to carry the second rotating shaft 40 and decouple the movement of the second rotating shaft 40 relative to the second bearing housing 81; the single-row deep groove ball bearing 822 is disposed between the thrust ball bearing 821 and the second bearing cap 83 and is used to decouple the movement of the second rotating shaft 40 relative to the second bearing housing 81.

[0077] The third support mechanism 90 includes a third bearing housing 91, a third bearing assembly 92, a third bearing cover 93, and a fourth bearing cover 94. The third bearing housing 91 is used to connect the frame; the third bearing assembly 92 is built into the third bearing housing 91 and is connected to the end of the first rotating shaft 10 near the first drive mechanism 30 and the end of the second rotating shaft 40 away from the second rotating disk 50; the third bearing cover 93 is located at the end of the third bearing housing 91 near the second support mechanism 80; and the fourth bearing cover 94 is located at the end of the third bearing housing 91 away from the second support mechanism 80.

[0078] The third bearing assembly 92 includes a second deep groove ball bearing 921 and a pair of angular contact ball bearings 922. The second deep groove ball bearing 921 is used to decouple the movement of the second rotating shaft 40 relative to the third bearing housing 91; the pair of angular contact ball bearings 922 are disposed between the second deep groove ball bearing 921 and the fourth bearing cap 94, and are used to decouple the movement of the first rotating shaft 10 relative to the third bearing housing 91.

[0079] It can be seen that the above auxiliary structures are mainly divided into three categories: bearing housings, bearing caps, and various bearing combinations. Among them:

[0080] Bearing housing: There are three bearing housings distributed from top to bottom. The bearing housing is designed to fix the structure to different frames. Bolt holes are evenly distributed around the perimeter of the bearing housing. Through the bolt holes, it can be connected to the frame or other fixed structures to achieve the purpose of fixing the test structure.

[0081] Bearing caps: Bearing caps are shown in all three sets of partial views from top to bottom. Their main functions are to prevent external dust and for aesthetic purposes.

[0082] Various types of bearings: mainly serve to decouple rotating parts and transmit vertical gravity.

[0083] In some embodiments, the sleeve-shaft counter-rotation experimental device further includes a rotary seal disposed between the first rotating shaft 10 and the second rotating shaft 40, for forming a vacuum sealing cavity between the first rotating shaft 10 and the second rotating shaft 40.

[0084] For example, a rotary seal installed between the first rotating shaft 10 and the second rotating shaft 40 can employ magnetic fluid sealing technology. A sealing ring with a magnet is mounted on the second rotating shaft 40, and a magnetic field generator is positioned on the corresponding stationary frame or on the first rotating shaft 10. Magnetic fluid fills the gap between them, forming a contactless dynamic sealing liquid film. Simultaneously, a metal sheath can be added to the outside to prevent magnetic fluid leakage and ensure a vacuum environment. This design allows the seal to maintain a vacuum seal cavity with low friction and high reliability even under high-speed reverse rotation, reducing air resistance interference, featuring a compact structure and maintenance-free operation, thus improving experimental accuracy and safety.

[0085] In summary, the sleeve-shaft counter-rotation experimental apparatus of this application has the following advantages:

[0086] 1. By using a nested design of two drive shafts, the structure is compact and the two sets of drive shafts work independently without interfering with each other, achieving a more compact and perfect structural design within the effective use of space.

[0087] 2. By driving the dual rotating disks with two separate drive motors in a counter-rotating manner, higher relative speeds can be achieved with a relatively small disk radius design, thus fulfilling experimental requirements to a higher standard.

[0088] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0089] The foregoing has provided a detailed description of the shaft-rotation experimental apparatus provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A device for experimental counter-rotation of a sleeve shaft, characterized in that, include: The first rotating shaft is connected to the first rotating disk; A first driving mechanism is connected to the first rotating shaft and is used to drive the first rotating shaft and the first rotating disk to rotate. A second rotating shaft is nested within the first rotating shaft and connected to a second rotating disk, the second rotating disk being positioned opposite to the first rotating disk; The second drive mechanism is connected to the second rotating shaft and is used to drive the second rotating shaft and the second rotating disk to rotate.

2. The sleeve-shaft counter-rotation experimental apparatus as described in claim 1, characterized in that, The sleeve shaft counter-rotation experimental device further includes a first support mechanism, a second support mechanism, and a third support mechanism. The first support mechanism, the second support mechanism, and the third support mechanism are arranged sequentially along the direction close to the first drive mechanism. The first support mechanism is used to support the end of the first rotating shaft away from the first drive mechanism. The second support mechanism is used to support the end of the second rotating shaft close to the second rotating disk. The third support mechanism is used to support the end of the first rotating shaft close to the first drive mechanism and the end of the second rotating shaft away from the second rotating disk.

3. The sleeve-shaft counter-rotation experimental apparatus as described in claim 2, characterized in that, The first support mechanism includes: The first bearing housing is used to connect the frame; The first bearing assembly is built into the first bearing housing and connected to the end of the first rotating shaft away from the first drive mechanism; The first bearing cover is disposed on the first bearing seat.

4. The sleeve-shaft counter-rotation experimental apparatus as described in claim 3, characterized in that, The first bearing assembly includes: A first deep groove ball bearing with a dust cover, the first deep groove ball bearing being used to decouple the movement of the first rotating shaft relative to the first bearing housing; A one-way thrust ball bearing is disposed between the first deep groove ball bearing and the first bearing cap, for bearing the first rotating shaft and decoupling the movement of the first rotating shaft relative to the first bearing housing.

5. The sleeve-shaft counter-rotation experimental apparatus as described in claim 2, characterized in that, The second support mechanism includes: The second bearing housing is used to connect the frame; The second bearing assembly is built into the second bearing housing and connected to one end of the second rotating shaft near the second rotating disk; The second bearing cover is disposed on the second bearing housing.

6. The sleeve-shaft counter-rotation experimental apparatus as described in claim 5, characterized in that, The second bearing assembly includes: A thrust ball bearing is used to support the second rotating shaft and decouple the movement of the second rotating shaft relative to the second bearing housing; A single-row deep groove ball bearing is disposed between the thrust ball bearing and the second bearing cap to decouple the movement of the second rotating shaft relative to the second bearing housing.

7. The sleeve-shaft counter-rotation experimental apparatus as described in claim 2, characterized in that, The third support mechanism includes: The third bearing housing is used to connect the frame; The third bearing assembly is built into the third bearing housing and is connected to the end of the first rotating shaft near the first drive mechanism and the end of the second rotating shaft away from the second rotating disk. The third bearing cover is located at one end of the third bearing seat near the second support mechanism; The fourth bearing cover is located at the end of the third bearing seat away from the second support mechanism.

8. The sleeve-shaft counter-rotation experimental apparatus as described in claim 7, characterized in that, The third bearing assembly includes: A second deep groove ball bearing is used to decouple the movement of the second rotating shaft relative to the third bearing housing; A pair of angular contact ball bearings are disposed between the second deep groove ball bearing and the fourth bearing cap to decouple the movement of the first rotating shaft relative to the third bearing housing.

9. The sleeve-shaft counter-rotation experimental apparatus as described in any one of claims 1-8, characterized in that, The second drive mechanism includes: The first transmission wheel is mounted on the second rotating shaft; The second transmission wheel is connected to the first transmission wheel in a transmission connection, and the rotation axis of the second transmission wheel is parallel to the rotation axis of the first transmission wheel; The second driving component is connected to the second transmission wheel and is used to drive the second transmission wheel to rotate, so that the first transmission wheel and the second rotating shaft rotate.

10. The experimental apparatus for counter-rotation of the sleeve shaft as described in any one of claims 1-8, characterized in that, The sleeve-shaft counter-rotation experimental device further includes a rotary seal disposed between the first rotating shaft and the second rotating shaft, for forming a vacuum sealing cavity between the first rotating shaft and the second rotating shaft.

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