Emergency protection structure for balanced magnetic suspension rotor

Abstract

This utility model relates to the field of magnetic levitation rotor technology and discloses an emergency protection structure for a balanced magnetic levitation rotor. It includes an axial rotor with a rotor blade mounted on it, and a locking pin fixedly connected to the axial rotor. It also includes a protective bearing assembly coaxially mounted on the axial rotor. This protective bearing assembly provides support to the axial rotor when the magnetic levitation buoyancy disappears due to equipment start-up, shutdown, or malfunction, preventing equipment damage and improving system reliability. In this utility model, the protective bearing assembly and locking pin, along with their interaction with the axial rotor, achieve precise support in emergency situations. When the magnetic levitation buoyancy is not stably established during equipment start-up or shutdown, or when a sudden malfunction in the magnetic levitation system causes the buoyancy to disappear, the protective bearing assemblies at both ends of the axial rotor can immediately provide mechanical support to the axial rotor, preventing rigid collisions between the axial rotor and the stator and effectively protecting the axial rotor.

Description

Technical Field

[0001] This utility model relates to the field of magnetic levitation rotor technology, and in particular to an emergency protection structure for a balanced magnetic levitation rotor. Background Technology

[0002] In the field of high-speed rotation in modern aircraft, magnetic levitation technology has become a core technology to replace traditional rolling and sliding bearings due to its significant advantages such as no mechanical contact, extremely low friction loss, high upper speed limit, and low operating noise. Among them, balanced magnetic levitation rotors, with their characteristics of actively controlling the rotor's dynamic balance through magnetic fields, adapting to higher speeds, and having strong anti-interference capabilities, have further broadened the application scenarios of magnetic levitation technology in high-precision and high-reliability equipment. In addition to low-altitude aircraft, magnetic levitation rotors are also used in high-precision rotating equipment in the industrial field, such as small high-speed centrifugal separation equipment and rotating platforms for precision testing. In these types of equipment, the non-contact characteristics of magnetic levitation rotors can avoid rotational accuracy deviations caused by mechanical friction.

[0003] Currently available magnetic levitation rotors generally lack emergency protection components. During the start-up and shutdown phases, when the magnetic levitation buoyancy has not been stably established or when the magnetic levitation system suddenly malfunctions and the buoyancy disappears, the high-speed rotating rotor loses all suspension support and will fall rapidly or deviate violently under its own gravity and inertia, resulting in a high-speed rigid collision with the stator or fixed parts of the equipment. The rotor lacks effective support and is prone to collision with the stator, causing damage to the components.

[0004] To address this issue, an emergency protection structure for a balanced magnetic levitation rotor is proposed. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides an emergency protection structure for a balanced magnetic levitation rotor, which aims to improve the problem that existing magnetic levitation rotors generally do not have emergency protection components.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The system includes an axial rotor, on which a rotor blade is provided, and a snap-fit ​​post is fixedly connected to the axial rotor; and also includes:

[0008] The protective bearing assembly is coaxially mounted on the axial rotor to provide support for the axial rotor when the magnetic levitation force is lost due to equipment start-up, shutdown, or failure, thus preventing equipment damage and improving system reliability.

[0009] As a further description of the above technical solution:

[0010] The number of protective bearing assemblies is two, respectively set at both ends of the axial rotor to provide double support. The protective bearing assembly includes an inner bearing ring, which is sleeved on the outside of the axial rotor. Movable balls are movably embedded on the outer surface of the inner bearing ring. An outer bearing ring is sleeved on the outside of the inner bearing ring. Multiple movable balls are slidably connected inside the outer bearing ring. The top and bottom of the outer bearing ring are sealed between the outer bearing ring and the inner bearing ring by sealing elements.

[0011] As a further description of the above technical solution:

[0012] The sealing element includes a sealing cover, which is fixedly installed on the outer ring of the bearing. The movable ball is slidably connected to the inner side of the sealing cover. The inner side of the sealing cover has a circular groove for the movable ball to roll inside the sealing cover.

[0013] As a further description of the above technical solution:

[0014] The top and bottom of the inner ring of the bearing are movably inlaid with support balls, and the inner side of the sealing cover is provided with a small circular groove for the support balls to slide and connect.

[0015] As a further description of the above technical solution:

[0016] The sealing cap and the outer ring of the bearing can be fixedly installed or fixedly connected according to the application equipment.

[0017] As a further description of the above technical solution:

[0018] There are two snap-fit ​​pins, which are fixedly connected to both ends of the axial rotor, and the snap-fit ​​pins are integrally formed with the axial rotor.

[0019] As a further description of the above technical solution:

[0020] The rotor is fixedly mounted on the axial rotor and rotates at the same speed as the axial rotor. The rotor is made of lightweight carbon fiber material.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, by protecting the bearing assembly and the snap-fit ​​column and cooperating with the axial rotor, precise support is achieved in emergency working conditions. When the magnetic levitation buoyancy is not stably established during the equipment start-up and shutdown phase, or when the magnetic levitation system suddenly fails and the buoyancy disappears, the protective bearing assembly at both ends of the axial rotor can immediately provide mechanical support for the axial rotor, avoid rigid collision between the axial rotor and the stator, and effectively protect the axial rotor.

[0023] 2. In this utility model, the supporting balls slide with the small ring groove, achieving a double ball support effect with the protective bearing assembly. This reduces frictional loss during emergency support and improves the coaxiality of the axial rotor rotation. At the same time, the seal can effectively prevent external dust and impurities from entering between the outer and inner rings of the bearing, extending the service life of the protective bearing assembly. Combined with the double-ended protective bearing assembly, it forms double protection and further optimizes the emergency support effect. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of an emergency protection structure for a balanced magnetic levitation rotor proposed in this utility model;

[0025] Figure 2 This is an exploded structural diagram of the axial rotor and protective bearing assembly of an emergency protection structure for a balanced magnetic levitation rotor proposed in this utility model.

[0026] Figure 3 This is a three-dimensional structural diagram of the snap-fit ​​post of an emergency protection structure for a balanced magnetic levitation rotor proposed in this utility model;

[0027] Figure 4 This is a three-dimensional exploded view of the protective bearing assembly of an emergency protection structure for a balanced magnetic levitation rotor proposed in this utility model.

[0028] Legend: 1. Axial rotor; 2. Rotor; 3. Snap-fit ​​pin; 4. Protective bearing assembly; 41. Inner bearing ring; 42. Moving ball; 43. Outer bearing ring; 44. Seal; 441. Sealing cap; 442. Equal circular groove; 5. Support ball; 6. Small circular groove. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Reference Figure 1-4 The present invention provides an embodiment of an emergency protection structure for a balanced magnetic levitation rotor, comprising an axial rotor 1, a rotor 2 disposed on the axial rotor 1, a snap-fit ​​post 3 fixedly connected to the axial rotor 1, and further comprising a protective bearing assembly 4, which is coaxially disposed on the axial rotor 1 and is used to provide support for the axial rotor 1 when the magnetic levitation buoyancy is lost due to equipment start-up, shutdown or failure, thereby preventing equipment damage and improving system reliability.

[0031] Specifically, under normal operating conditions, the balanced magnetic levitation rotor 2 uses information from sensor components to adjust the current of an external motor through the radial and axial magnetic levitation bearings to generate a stable electromagnetic force, keeping the axial rotor 1 in a non-contact levitation state. At this time, the rotor 2 rotates at the same speed as the axial rotor 1. This solution is used for emergency use after the axial rotor 1 loses its magnetic levitation force. There are two protective bearing assemblies 4, which are symmetrically arranged at both ends of the axial rotor 1. Through the double support structure, a full-stroke protection is formed to ensure that the rotor is subjected to balanced force in emergency conditions. The locking column 3 plays a role in applying the weight of the axial rotor 1 to the inner ring 41 of the bearing after it falls, so that the inner ring 41 can convert the high-speed rotating axial rotor 1 from a levitation rotation state to a mechanical rotation state, so that the high-speed rotating axial rotor 1 can smoothly transition to a stop state through the protective bearing assembly 4.

[0032] Reference Figure 2-4 There are two protective bearing assemblies 4, which are respectively set at both ends of the axial rotor 1 to provide double support. The protective bearing assembly 4 includes an inner bearing ring 41, which is sleeved on the outside of the axial rotor 1. Movable balls 42 are movably embedded on the outer surface of the inner bearing ring 41. An outer bearing ring 43 is sleeved on the outside of the inner bearing ring 41. Multiple movable balls 42 are slidably connected inside the outer bearing ring 43. The top and bottom of the outer bearing ring 43 are sealed between the outer bearing ring 43 and the inner bearing ring 41 by a seal 44.

[0033] Specifically, the two protective bearing assemblies 4 are symmetrically distributed along the central axis of the axial rotor 1. The inner bearing ring 41 is made of high-strength alloy steel and is placed on the outer circumferential surface at both ends of the axial rotor 1. The retaining pin 3 is placed on the upper part of the inner bearing ring 41 to ensure that after the buoyancy of the axial rotor 1 disappears, it can fall onto the inner bearing ring 41 through the retaining pin 3 at the first moment, which is converted into mechanical rotation and supports it. A ring of evenly distributed ball mounting grooves is opened on the outer surface of the inner bearing ring 41. A movable ball 42 is embedded in each ball mounting groove, and the outer part of the movable ball 42 protrudes from the outer surface of the inner bearing ring 41. Correspondingly, the outer bearing ring 43 is made of corrosion-resistant alloy material, and its inner wall is provided with an annular raceway adapted to the movable ball 42. The part of the movable ball 42 that protrudes from the inner bearing ring 41 is precisely embedded in the annular raceway to form a rolling fit, so that the inner bearing ring 41 can rotate flexibly relative to the outer bearing ring 43. At the same time, the radial force transmitted by the axial rotor 1 is dispersed through the movable ball 42.

[0034] Reference Figure 2-4The seal 44 includes a sealing cover 441, which is fixedly installed on the outer ring 43 of the bearing. The movable ball 42 is slidably connected to the inner side of the sealing cover 441. The inner side of the sealing cover 441 is provided with a circular rolling groove 442 for the movable ball 42 to roll on the inner side of the sealing cover 441.

[0035] Specifically, the sealing cover 441 is made of a corrosion-resistant alloy of the same material as the bearing outer ring 43, and has an annular disc structure. Its outer diameter matches the outer diameter of the bearing outer ring 43, and its inner diameter is slightly larger than the inner diameter of the bearing inner ring 41, but still covers two-thirds of the bearing inner ring 41, ensuring that the sealing cover 441 does not interfere with the bearing inner ring 41 after installation. The sealing cover 441 is fixed to the top and bottom end faces of the bearing outer ring 43 by circumferentially evenly distributed fastening bolts. The bolt holes avoid the annular raceway of the bearing outer ring 43 to avoid damaging the support structure. The inner side of the sealing cover 441, facing the movable ball 42, is precisely... A circular groove 442 is formed by machining. The diameter of the circular groove 442 is adapted to the diameter of the movable ball 42, and the center trajectory of the groove is coaxial with the center trajectory of the annular raceway on the inner wall of the outer ring 43 of the bearing. This allows the movable ball 42 to be embedded in the annular raceway of the outer ring 43 of the bearing on its outer side when rolling, while its two side edges are attached to the circular groove 442 of the sealing cover 441. This not only achieves all-round positioning of the movable ball 42 and prevents it from falling out between the inner ring 41 and the outer ring 43 of the bearing, but also reduces the frictional loss between the sealing cover 441 and the movable ball 42 through rolling cooperation, ensuring the stable operation of the bearing assembly 4 during emergency support.

[0036] Reference Figure 2-4 The top and bottom of the inner ring 41 of the bearing are movably inlaid with support balls 5, and the inner side of the sealing cover 441 is provided with a small circular groove 6 for sliding connection of the support balls 5.

[0037] Specifically, a ring of support ball 5 mounting grooves is circumferentially formed on both the top and bottom end faces of the bearing inner ring 41. Each support ball 5 is embedded in one mounting groove, and the end face of the support ball 5 protrudes from the end face of the bearing inner ring 41 to ensure effective contact with the sealing cover 441. The diameter of the small ring groove 6 is precisely matched with the diameter of the support ball 5, and the groove depth is slightly greater than the height of the support ball 5 protruding from the end face of the bearing inner ring 41, so that the part of the support ball 5 protruding from the bearing inner ring 41 is precisely embedded in the small ring groove 6 to form a sliding fit. When the axial rotor 1 experiences axial displacement under emergency conditions, the support ball 5 will roll along the small ring groove 6, replacing the axial displacement with rolling friction. Rigid contact not only restricts the axial movement of the inner ring 41 of the bearing, but also disperses the axial force, preventing uneven force distribution caused by axial displacement when the movable ball 42 bears the radial force alone. At the same time, the cooperation between the support ball 5 and the small ring groove 6 further improves the coaxiality of the inner ring 41 and the outer ring 43 of the bearing, reducing the radial runout when the axial rotor 1 rotates. Together with the movable ball 42 and the equal circular groove 442, it forms a dual limiting support structure in the radial and axial directions, which greatly enhances the support stability of the protective bearing assembly 4 under emergency conditions. Combined with the sealing effect of the sealing cover 441, it ensures that the support ball 5 is in a clean and lubricated environment for a long time, avoiding the impact of impurities on the protective effect.

[0038] Reference Figure 2-4 The sealing cover 441 and the bearing outer ring 43 can be fixedly installed or fixedly connected according to the application equipment.

[0039] Specifically, the connection method between the sealing cover 441 and the bearing outer ring 43 can be flexibly adapted to meet the needs of different application scenarios. In equipment that requires regular maintenance in the industrial field, bolt fixing is preferred. The sealing cover 441 has 6 through holes evenly opened around its circumference, and the bearing outer ring 43 has threaded holes at corresponding positions. The connection is made by passing an internal hex bolt through the through holes and fastening it to the threaded holes. This method is easy to disassemble, and the sealing cover 441 can be opened regularly to check the wear of the moving ball 42 and the supporting ball 5 as well as the internal lubrication status, making maintenance very convenient.

[0040] In equipment such as low-altitude aircraft where there are higher requirements for structural compactness and vibration resistance, welding can also be used for fixing. After the connection surface of the sealing cover 441 and the bearing outer ring 43 is ground, it is continuously welded in the circumferential direction by argon arc welding to form a gapless seal. Welding can completely prevent the intrusion of external impurities and has extremely high connection strength, making it suitable for long-term operation without disassembly and maintenance. However, it is necessary to ensure the coaxiality of the sealing cover 441 and the bearing outer ring 43 before welding to avoid welding deformation affecting the rolling trajectory of the balls.

[0041] Reference Figure 2-4 There are two snap-fit ​​posts 3, which are fixedly connected to both ends of the axial rotor 1 respectively. The snap-fit ​​posts 3 and the axial rotor 1 are integrally formed.

[0042] Specifically, the snap-fit ​​post 3 and the axial rotor 1 are integrally formed without any splicing gaps, which can avoid the risk of fracture caused by stress concentration in traditional welding or bolt connection methods, greatly improve the structural strength at both ends of the axial rotor 1, and can stably withstand the axial lift generated by the high-speed rotation of the rotor 2, as well as the impact force transmitted by the bearing assembly 4 in emergency conditions.

[0043] Reference Figure 2-4 The rotor 2 is fixedly installed on the axial rotor 1 and rotates at the same speed as the axial rotor 1. The rotor 2 is made of lightweight carbon fiber material to ensure stability at high speeds.

[0044] Specifically, rotor 2 is made of T700 grade carbon fiber composite material through compression molding, which can withstand centrifugal force and airflow impact at high speeds of 8000-12000 r / min, ensuring that rotor 2 deformation is controlled within 0.1 mm, avoiding flutter or structural failure due to insufficient material rigidity. The surface of rotor 2 is also treated with epoxy wear-resistant coating, which not only improves surface smoothness and reduces airflow friction loss, but also enhances resistance to rain and sand erosion, making it suitable for the complex environment of low-altitude flight. Through the above design, relying on the lightweight and high-strength characteristics of carbon fiber material and precise structural design, stable lift output and structural integrity are maintained at high speeds, while not interfering with the suspension control and emergency functions of the magnetic levitation system's protection components.

[0045] Working principle: When entering the emergency phase, covering both equipment start-up and sudden failure scenarios, the protective bearing assembly 4 and the locking post 3 immediately activate the protection mechanism. When the equipment starts up or stops, the magnetic levitation buoyancy has not reached the stable threshold. The locking post 3 of the axial rotor 1 is integrally formed with the axial rotor 1 and first fits against the inner bearing ring 41 of the protective bearing assembly 4, transferring the weight and rotational load of the axial rotor 1 to the inner bearing ring 41. The inner bearing ring 41, through the rolling engagement of the outer surface movable balls 42 with the raceway of the outer bearing ring 43 and the equal circular groove 442, and the sliding of the top / bottom support balls 5 along the small ring groove 6 of the sealing cover 441, disperses the radial and axial forces with a double ball structure, replacing rigid contact with rolling friction. The contact provides temporary centering support for the axial rotor 1 to prevent it from impacting the stator until the buoyancy stabilizes and the axial rotor 1 comes to a smooth stop. If a sudden failure of the magnetic levitation system causes the buoyancy to disappear, the locking column 3 quickly transfers the impact load of the axial rotor 1 to the inner ring 41 of the bearing. The moving ball 42 and the supporting ball 5 immediately receive and buffer the force value. At the same time, after the sensor of the balanced magnetic levitation rotor 2 detects the abnormal displacement of the axial rotor 1, it transmits the fault signal to the controller, triggers the emergency stop procedure, cuts off the power and starts the brake, shortens the dangerous period of high-speed rotation of the rotor, and avoids damage to the components due to collision. This achieves the effect of emergency protection for the axial rotor 1 when the balanced magnetic levitation rotor 2 starts and stops or when a sudden failure occurs.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An emergency protection structure for a balanced magnetic levitation rotor, comprising an axial rotor (1) on which a rotor (2) is disposed, characterized in that: The axial rotor (1) is fixedly connected to a snap-fit ​​post (3), and also includes; The protective bearing assembly (4) is coaxially mounted on the axial rotor (1) to provide support for the axial rotor (1) when the magnetic levitation force disappears due to equipment start-up, shutdown or failure, thereby preventing equipment damage and improving system reliability.

2. The emergency protection structure for a balanced magnetic levitation rotor according to claim 1, characterized in that: The number of the protective bearing assemblies (4) is two, which are respectively set at both ends of the axial rotor (1) to provide double support. The protective bearing assembly (4) includes an inner bearing ring (41), which is sleeved on the outside of the axial rotor (1). The outer surface of the inner bearing ring (41) is movably inlaid with movable balls (42). The outer side of the inner bearing ring (41) is sleeved with an outer bearing ring (43). Multiple movable balls (42) are slidably connected inside the outer bearing ring (43). The top and bottom of the outer bearing ring (43) are sealed between the outer bearing ring (43) and the inner bearing ring (41) by a seal (44).

3. The emergency protection structure for a balanced magnetic levitation rotor according to claim 2, characterized in that: The sealing element (44) includes a sealing cover (441), which is fixedly installed on the outer ring (43) of the bearing. The movable ball (42) is slidably connected to the inner side of the sealing cover (441). The inner side of the sealing cover (441) is provided with a circular rolling groove (442) for the movable ball (42) to roll on the inner side of the sealing cover (441).

4. The emergency protection structure for a balanced magnetic levitation rotor according to claim 3, characterized in that: The top and bottom of the inner ring (41) of the bearing are movably inlaid with supporting balls (5), and the inner side of the sealing cover (441) is provided with a small ring groove (6) for the supporting balls (5) to slide and connect.

5. The emergency protection structure for a balanced magnetic levitation rotor according to claim 4, characterized in that: The sealing cap (441) and the bearing outer ring (43) can be fixedly installed or fixedly connected according to the application equipment.

6. The emergency protection structure for a magnetic levitation rotor according to claim 1, characterized in that: There are two snap-fit ​​pins (3), which are fixedly connected to both ends of the axial rotor (1) respectively. The snap-fit ​​pins (3) and the axial rotor (1) are integrally formed.

7. The emergency protection structure for a magnetic levitation rotor according to claim 1, characterized in that: The rotor (2) is fixedly mounted on the axial rotor (1) and rotates at the same speed as the axial rotor (1). The rotor (2) is made of lightweight carbon fiber material.

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