Flywheel protection device and magnetic suspension flywheel energy storage system

Abstract

The application provides a flywheel protection device and a magnetic suspension flywheel energy storage system, and belongs to the technical field of magnetic suspension energy storage. The flywheel protection device comprises a first protection bearing, an inner ring of the first protection bearing being connected with a rotor; a second protection bearing, an outer ring of the second protection bearing being connected with a shell; an outer ring of the first protection bearing being gap-fitted with an inner ring of the second protection bearing; a buffer ring, an outer wall of the buffer ring being connected with the inner ring of the second protection bearing; and an inner wall of the buffer ring being gap-fitted with the outer ring of the first protection bearing. When the magnetic suspension bearing cannot maintain a suspension state and suddenly fails, the buffer ring on the second protection bearing connected with the shell collides with the first protection bearing connected with the rotor, direct collision of the rotor and the protection bearing is avoided, the probability of damage of the rotor is reduced, and the service life of the flywheel is increased.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation energy storage technology, specifically to a flywheel protection device and a magnetic levitation flywheel energy storage system. Background Technology

[0002] A magnetic levitation flywheel energy storage system is a device that stores electrical energy as kinetic energy and generates electrical energy from the stored kinetic energy.

[0003] In a magnetic levitation energy storage system, a gap exists between the rotor and the protective bearing. During operation, the rotor rotates at high speed within this gap. If the rotor can maintain a centered position, the magnetic bearing can minimize losses and vibrations. However, in the event of severe flywheel eccentricity or power source interruption, the magnetic bearing may fail to maintain its levitation state and could suddenly malfunction, causing the flywheel rotor to collide with the protective bearing, potentially damaging system components. To minimize damage to system components due to malfunctions, rolling bearings are placed along the flywheel rotor axis as protective bearings. In the event of flywheel instability, the rotor rotates on the protective bearings, ensuring that critical system components are not damaged.

[0004] However, the protective bearings used in current magnetic levitation systems employ a single mechanical bearing structure. Direct impact of the rotor on the protective bearing can damage the internal structure of the device and reduce the lifespan of the flywheel. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the existing magnetic levitation system, which uses a single mechanical bearing structure for the protective bearing. Direct impact of the rotor on the protective bearing will damage the internal structure of the device and reduce the service life of the flywheel. Thus, a flywheel protection device is provided.

[0006] The present invention also provides a magnetic levitation flywheel energy storage system.

[0007] To solve the above-mentioned technical problems, the present invention provides a flywheel protection device, comprising:

[0008] The first protective bearing, the inner ring of the first protective bearing is connected to the rotor;

[0009] The second protective bearing has its outer ring connected to the housing; the outer ring of the first protective bearing and the inner ring of the second protective bearing are clearance-fitted.

[0010] As a preferred option, it also includes:

[0011] A buffer ring, the outer wall of which is connected to the inner ring of the second protective bearing; the inner wall of the buffer ring is clearance-fitted with the outer ring of the first protective bearing.

[0012] As a preferred embodiment, the buffer ring is made of high-strength spring steel.

[0013] As a preferred embodiment, the inner wall of the buffer ring is provided with a plurality of first protrusions at intervals; the outer wall of the buffer ring is provided with a plurality of second protrusions at intervals.

[0014] As a preferred embodiment, the number of the first boss and the number of the second boss are equal, and the first boss and the second boss are staggered.

[0015] As a preferred embodiment, the inner ring of the first protective bearing abuts against the top cover of the first protective bearing; the top cover of the first protective bearing is connected to the rotor by bolts.

[0016] As a preferred embodiment, the outer ring of the second protective bearing abuts against the top cover of the second protective bearing; the top cover of the second protective bearing is connected to the outer casing by bolts.

[0017] As a preferred option, it also includes:

[0018] A sealing ring is disposed between the top cover of the second protective bearing and the housing.

[0019] As a preferred embodiment, the second protective bearing and the buffer ring are connected by welding or interference fit.

[0020] The present invention also provides a magnetic levitation flywheel energy storage system, including the flywheel protection device described in any one of the above.

[0021] The technical solution of this invention has the following advantages:

[0022] 1. The flywheel protection device provided by the present invention includes: a first protective bearing and a second protective bearing; when the magnetic levitation bearing fails suddenly due to its inability to maintain levitation, it collides with the first protective bearing connected to the rotor and the second protective bearing connected to the outer casing, thereby avoiding direct impact between the rotor and the protective bearing, reducing the probability of rotor damage, and increasing the service life of the flywheel.

[0023] 2. The flywheel protection device provided by the present invention further includes: a buffer ring; which can further protect the rotor; and a first boss and a second boss are provided on the inner wall and outer wall of the buffer ring, the first boss and the second boss forming a beam structure, which can effectively buffer impact.

[0024] 3. The flywheel protection device provided by the present invention has a top cover of the first protective bearing pressing against the inner ring of the first protective bearing to prevent axial movement of the first protective bearing; the top cover of the first protective bearing and the rotor are connected together by bolts to ensure that the first protective bearing and the top cover of the first protective bearing will not fall off when the rotor rotates.

[0025] In summary, this invention proposes a flywheel protection device with fewer intermediate mechanisms, high reliability, the ability to withstand certain axial loads, and reduced destructive impact on the rotor in the event of an unexpected power outage in a magnetic levitation flywheel energy storage system. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a front view structural diagram of the flywheel protection device of the present invention.

[0028] Figure 2 for Figure 1 The diagram shows a cross-sectional view along the AA direction.

[0029] Figure 3 This is a schematic diagram of the buffer ring structure of the present invention.

[0030] Figure 4 This is a partial structural schematic diagram of the flywheel protection device of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. First protective bearing; 2. Second protective bearing; 3. Rotor; 4. Housing; 5. Buffer ring; 6. Top cover of the first protective bearing; 7. Top cover of the second protective bearing; 8. Sealing ring; 9. First boss; 10. Second boss. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "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 invention 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 invention.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Example 1

[0038] This embodiment provides a flywheel protection device, such as Figure 1 , 2 As shown, it includes: a first protective bearing 1 and a second protective bearing 2; the inner ring of the first protective bearing 1 is connected to the rotor 3; the outer ring of the second protective bearing 2 is connected to the housing 4; the outer ring of the first protective bearing 1 and the inner ring of the second protective bearing 2 are clearance-fitted.

[0039] When the magnetic levitation bearing fails suddenly due to its inability to maintain levitation, the first protective bearing 1 connected to the rotor 3 and the second protective bearing 2 connected to the outer casing 4 collide with each other, avoiding direct impact between the rotor 3 and the protective bearings, reducing the probability of damage to the rotor 3, and increasing the service life of the flywheel.

[0040] A buffer ring 5 is also provided between the first protective bearing 1 and the second protective bearing 2. The outer wall of the buffer ring 5 is connected to the inner ring of the second protective bearing 2. At the same time, the inner wall of the buffer ring 5 is in clearance fit with the outer ring of the first protective bearing 1. That is, the gap between the inner wall of the buffer ring 5 and the outer ring of the first protective bearing 1 is the radial working gap of the magnetic levitation system.

[0041] Furthermore, the buffer ring 5 is made of high-strength spring steel.

[0042] like Figure 3 As shown, multiple first protrusions 9 are spaced apart on the inner wall of the buffer ring 5, and multiple second protrusions 10 are spaced apart on the outer wall of the buffer ring 5; specifically, the number of first protrusions 9 and the number of second protrusions 10 are equal, and the first protrusions 9 and the second protrusions 10 are staggered.

[0043] The first protrusion 9 and the second protrusion 10 form a beam structure on the buffer ring 5, which can effectively mitigate impact.

[0044] The circumferential length B of the buffer ring 5 is determined by the axial working clearance of the magnetic bearing, the radius of the axial thrust disk, and the width of the first protective bearing 1.

[0045] Furthermore, the design rules for buffer ring 5 are as follows:

[0046]

[0047] Where m is the number of the first boss 9 and the second boss 10, b1 and b2 are the widths of the first boss 9 and the second boss 10 respectively, and d1 and d2 are the inner and outer diameters of the first boss 9 and the second boss 10 respectively.

[0048] like Figure 2 , 4 As shown, the inner ring of the first protective bearing 1 abuts against the top cover 6 of the first protective bearing, and the top cover 6 of the first protective bearing is connected to the rotor 3 by bolts; the top cover 6 of the first protective bearing presses against the inner ring of the first protective bearing 1 to prevent the first protective bearing 1 from moving axially, and the top cover 6 of the first protective bearing and the rotor 3 are connected together by bolts to ensure that the first protective bearing 1 and the top cover 6 of the first protective bearing will not fall off when the rotor 3 rotates.

[0049] The outer ring of the second protective bearing 2 abuts against the top cover 7 of the second protective bearing. The top cover 7 of the second protective bearing is connected to the outer shell 4 by bolts. Furthermore, a sealing ring 8 is provided between the top cover 7 of the second protective bearing and the outer shell 4.

[0050] The second protective bearing 2 and the buffer ring 5 are connected by welding or interference fit. When the axial working clearance of the magnetic bearing in the rotor 3 shaft system is greater than the radial working clearance of the magnetic bearing, the buffer ring 5 is welded to the inner ring of the second protective bearing 2. When the axial clearance of the magnetic bearing in the rotor 3 shaft system is less than the radial working clearance of the magnetic bearing, the rotor 3 and the first protective bearing 1 are installed by pressure fit.

[0051] Usage and Principles

[0052] When the flywheel system is operating normally, the first protective bearing 1 and its top cover 6 rotate with the flywheel, and there is a working gap between the first protective bearing 1 and the buffer ring 5. At this time, the first protective bearing 1 and the second protective bearing 2 are in a non-working state. When the magnetic bearing fails, the rotor 3 will oscillate violently with a small amplitude and rotate at high speed. The main task of the radial protective bearing is to bear the rotation of the rotor 3, radial impact, and part of the axial impact. When the magnetic bearing fails, the first protective bearing 1 collides with the buffer ring 5, and the buffer ring 5 drives the inner ring of the second protective bearing 2 to rotate.

[0053] This design prevents the rotor 3 from directly impacting the inner ring of the protective bearing, thus avoiding structural damage to the rotor 3 and the bearing. By setting up a buffer structure, the first protective bearing 1 and the second protective bearing 2 collide, ensuring the structural integrity of the rotor 3 itself. Furthermore, the first protective bearing 1 and the second protective bearing 2 are easy to replace.

[0054] Example 2

[0055] This embodiment provides a magnetic levitation flywheel energy storage system, including the flywheel protection device described in Embodiment 1.

[0056] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A flywheel protection device, characterized in that, include: The first protective bearing (1) has its inner ring connected to the rotor (3); The outer ring of the second protective bearing (2) is connected to the outer shell (4); the outer ring of the first protective bearing (1) and the inner ring of the second protective bearing (2) are in clearance fit. A buffer ring (5) is provided, the outer wall of which is connected to the inner ring of the second protective bearing (2); the inner wall of the buffer ring (5) is clearance-fitted with the outer ring of the first protective bearing (1). The inner wall of the buffer ring (5) is provided with a plurality of first protrusions (9) at intervals; the outer wall of the buffer ring (5) is provided with a plurality of second protrusions (10) at intervals. The number of the first protrusion (9) and the number of the second protrusion (10) are equal, and the first protrusion (9) and the second protrusion (10) are staggered. The inner ring of the first protective bearing (1) abuts against the top cover (6) of the first protective bearing; the top cover (6) of the first protective bearing is connected to the rotor (3) by bolts.

2. The flywheel protection device according to claim 1, characterized in that, The buffer ring (5) is made of high-strength spring steel.

3. The flywheel protection device according to claim 1, characterized in that, The outer ring of the second protective bearing (2) abuts against the top cover (7) of the second protective bearing; the top cover (7) of the second protective bearing is connected to the outer shell (4) by bolts.

4. The flywheel protection device according to claim 1, characterized in that, Also includes: A sealing ring (8) is disposed between the top cover (7) of the second protective bearing and the outer casing (4).

5. The flywheel protection device according to claim 1, characterized in that, The second protective bearing (2) and the buffer ring (5) are connected by welding or interference fit.

6. A magnetic levitation flywheel energy storage system, characterized in that, The flywheel protection device includes any one of claims 1-5.

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