Flywheel rotor and flywheel energy storage battery

Abstract

The invention provides a flywheel rotor and a flywheel energy storage battery, the flywheel rotor comprises a body, a matching hole is formed in the middle of the body, and the matching hole is used for being matched with a flywheel shaft; a weight reduction groove is formed in each of the two opposite sides of the matching hole of the body, and the weight reduction grooves are arranged around the radial and circumferential directions of the body; wherein a carbon fiber layer is wound on the periphery of the body. According to the flywheel rotor, the two sides of the matching hole are respectively provided with one annular weight reduction groove, so that the weight of the rotor is reduced, and meanwhile, the carbon fiber layer is wound on the outer side of the body, so that the structural strength of the rotor is ensured; by reducing the weight of the rotor, the bearing friction and the wind resistance loss can be reduced, so that the system efficiency is improved, the input energy can be effectively converted into the available output energy with the minimum loss, and meanwhile, the lightweight rotor can reach a higher rotating speed under the same input energy, so that more kinetic energy can be stored; and the requirement of instantaneous high power is met.

Description

Technical Field

[0001] The present invention relates to the technical field of flywheel energy storage for new energy vehicles, and particularly relates to a flywheel rotor and a flywheel energy storage battery. Background Art

[0002] A flywheel energy storage system is a physical energy storage method based on the conversion of rotational mechanical energy into electrical energy, and is composed of a flywheel, bearings, a motor / generator, a control system, etc. The flywheel converts mechanical energy into electrical energy through the motor / generator for storage, and at the same time, the control system can achieve control of the flywheel speed and charge and discharge control of the battery, etc.

[0003] Currently, in the field of new energy vehicles, higher requirements are put forward for the high energy recovery efficiency and instantaneous high power of the battery, while the traditional rotor structure cannot meet the requirements of high energy recovery efficiency and instantaneous high power.

[0004] Based on this, the inventors of the present application propose a flywheel rotor and a flywheel energy storage battery in order to solve one or more of the above technical problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect that the rotor in the prior art cannot meet the requirements of high energy recovery efficiency and instantaneous high power, and to provide a flywheel rotor and a flywheel energy storage battery.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a flywheel rotor, comprising:

[0008] A body, with a mating hole opened in the middle, and the mating hole is used for mating with a flywheel shaft;

[0009] On each side of the mating hole of the body, a weight-reducing groove is opened, and the weight-reducing grooves are arranged in a circumferential and radial direction around the body; wherein,

[0010] A carbon fiber layer is wound around the outer periphery of the body.

[0011] According to an embodiment of the present invention, the two weight-reducing grooves are respectively close to the mating hole along the radial direction of the body, and the two weight-reducing grooves are symmetrically arranged with the axis of the mating hole as the reference.

[0012] According to an embodiment of the present invention, a hollowed-out cavity is circumferentially arranged around the mating hole inside the body;

[0013] The hollowed-out cavity is communicated with the mating hole.

[0014] The present invention also proposes a flywheel energy storage battery, comprising:

[0015] The fuselage, having a receiving cavity;

[0016] It further includes a flywheel shaft, a motor rotor, a motor stator, and the flywheel rotor as described above, which are arranged in the receiving cavity; wherein,

[0017] The flywheel shaft is rotatably engaged with the fuselage at both ends;

[0018] The flywheel rotor and the motor rotor are respectively sleeved on the flywheel shaft, and the motor stator is sleeved outside the flywheel rotor and installed on the fuselage.

[0019] According to an embodiment of the present invention, a top cover is provided on the top of the fuselage, and a bottom cover is provided on the bottom of the fuselage. The top cover and the bottom cover are respectively threadedly connected to the fuselage, and the top cover and the bottom cover are used to seal the receiving cavity.

[0020] According to an embodiment of the present invention, a first bearing is provided inside the top cover, and one end of the flywheel shaft is rotatably engaged with the first bearing;

[0021] A second bearing is provided inside the bottom cover, and one end of the flywheel shaft is rotatably engaged with the second bearing.

[0022] According to an embodiment of the present invention, a magnetic bearing upper bracket, a first permanent magnetic bearing outer ring, and a first permanent magnetic bearing inner ring are provided on one side of the first bearing facing the second bearing; the first permanent magnetic bearing inner ring is sleeved outside the flywheel shaft, the first permanent magnetic bearing outer ring is sleeved on the first permanent magnetic bearing inner ring and installed on the magnetic bearing upper bracket, and one end of the magnetic bearing upper bracket is installed on the fuselage;

[0023] A magnetic bearing lower bracket, a second permanent magnetic bearing outer ring, and a second permanent magnetic bearing inner ring are provided on one side of the second bearing facing the first bearing; the second permanent magnetic bearing inner ring is sleeved outside the flywheel shaft, the second permanent magnetic bearing outer ring is sleeved on the second permanent magnetic bearing inner ring and installed on the magnetic bearing lower bracket, and one end of the magnetic bearing lower bracket is installed on the fuselage.

[0024] According to an embodiment of the present invention, the magnetic bearing upper bracket and the magnetic bearing lower bracket are respectively connected to the fuselage through threaded connectors.

[0025] According to an embodiment of the present invention, a support frame is provided outside the motor stator, and the support frame is connected to the fuselage through a threaded connector;

[0026] The motor stator is installed on the support frame, and the motor rotor is welded to the flywheel shaft.

[0027] According to an embodiment of the present invention, an electromagnetic bearing is further provided between the flywheel rotor and the support frame;

[0028] The material of the electromagnetic bearing is neodymium iron boron.

[0029] The positive and progressive effects of the present invention are as follows:

[0030] For the flywheel rotor of the present invention, an annular weight reduction groove is provided on each side of the fitting hole, thereby reducing the weight of the rotor. At the same time, a carbon fiber layer is wound around the outer side of the body, thereby ensuring the structural strength of the rotor itself.

[0031] By reducing the weight of the rotor, the present invention can reduce bearing friction and wind resistance loss, thereby improving the system efficiency. It can effectively convert the input energy into available output energy with minimal loss. At the same time, the lightweight rotor can reach a higher rotational speed under the same input energy, thereby storing more kinetic energy and meeting the demand for instantaneous high power. Description of the Drawings

[0032] The above and other features, properties, and advantages of the present invention will become more apparent from the following description in conjunction with the drawings and embodiments, wherein:

[0033] Figure 1 is a schematic structural diagram of the flywheel rotor of the present invention;

[0034] Figure 2 is a schematic structural diagram of the flywheel energy storage battery of the present invention;

[0035] Figure 3 is a partial schematic structural diagram of the flywheel energy storage battery of the present invention.

[0036] 1. Body; 11. Fitting hole; 12. Weight reduction groove; 13. Carbon fiber layer; 14. Hollow cavity;

[0037] 2. Flywheel shaft;

[0038] 3. Body; 31. Accommodating cavity; 32. Top cover; 321. First bearing; 322. Upper bracket of magnetic bearing; 323. Outer ring of first permanent magnetic bearing; 324. Inner ring of first permanent magnetic bearing; 33. Bottom cover; 331. Second bearing; 332. Lower bracket of magnetic bearing; 333. Outer ring of second permanent magnetic bearing; 334. Inner ring of second permanent magnetic bearing;

[0039] 4. Motor rotor;

[0040] 5. Motor stator; 51. Support frame;

[0041] 6. Electromagnetic bearing. Detailed Embodiments

[0042] The present invention will be further described below in conjunction with specific embodiments and the accompanying drawings. More details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention is obviously capable of being implemented in many other ways different from this description. Those skilled in the art can make similar generalizations and deductions according to the actual application situation without departing from the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0044] Please refer to Figure 1 , the present invention provides a flywheel rotor, including a body 1. A mating hole 11 is provided in the middle of the body 1 for mating with a flywheel shaft 2; a weight reduction groove 12 is provided on each of the two opposite sides of the mating hole 11 in the body 1, and the weight reduction grooves 12 are arranged circumferentially around the radial direction of the body 1; wherein, a carbon fiber layer 13 is wound around the outer periphery of the body 1.

[0045] That is to say, the traditional flywheel rotor is generally cylindrical in shape and has an excessive self-weight, thus unable to meet the requirements for high energy recovery efficiency and instantaneous high power in new energy vehicles.

[0046] Based on this, the present invention provides a weight reduction groove 12 on each of the two sides of the mating hole 11, thereby reducing the weight of the body 1, and then using a lighter body 1 to reduce bearing friction and wind resistance loss. In this way, it is beneficial to meet the high energy recovery efficiency and can improve the system efficiency.

[0047] That is to say, the lightweight rotor can reach a higher rotational speed under the same input energy. Under the condition of high-speed operation, the high rotational speed can store more kinetic energy, and thus can meet the demand for instantaneous high power.

[0048] Based on this, the present invention further winds a carbon fiber layer 13 around the outer periphery of the body 1 to meet the requirements for the structural strength of the body 1 itself.

[0049] Specifically, it can be wound circumferentially around the outer peripheral side of the body 1, which is used not only to resist the circumferential stress generated by centrifugal force but also to improve the structural strength of the body 1.

[0050] In one embodiment, the two weight reduction grooves 12 are respectively arranged close to the mating hole 11 along the radial direction of the body 1, and the two weight reduction grooves 12 are symmetrically arranged with the axis of the mating hole 11 as the reference.

[0051] It can be seen that symmetrically arranging the weight reduction grooves 12 can ensure uniform mass distribution of the body 1 and avoid vibration caused by asymmetry during high-speed rotation.

[0052] Please continue to refer to Figure 1 , a hollowed-out chamber 14 is circumferentially arranged around the mating hole 11 inside the body 1; the hollowed-out chamber 14 is communicated with the mating hole 11.

[0053] It can be seen that the material in the middle of the body 1 contributes less to the moment of inertia. After hollowing out, redundant mass can be removed, making the body 1 itself lighter. The body 1 is also easier to accelerate or decelerate, which is beneficial to improving the response speed of the body 1.

[0054] Specifically, the hollowed-out chamber 14 can also be annular, and the specific dimensions can be adjusted according to actual needs and are not limited here.

[0055] Furthermore, the hollowed-out chamber 14 is coaxially arranged with the mating hole 11 and axially arranged in the middle of the mating hole 11 along the axis of the mating hole 11.

[0056] When the body 1 rotates at high speed, centrifugal force will generate huge tensile stress inside the body 1. The setting of the hollowed-out chamber 14 avoids stress superposition by reducing the material in the central area, allows higher rotational speeds without breaking, and improves the service life of the body 1.

[0057] That is to say, by reducing the weight of the rotor in the present invention, bearing friction and wind resistance loss can be reduced, thereby improving the system efficiency.

[0058] Moreover, the input energy can be effectively converted into available output energy with minimal loss. At the same time, the lightweight rotor can reach a higher rotational speed under the same input energy, so more kinetic energy can be stored to meet the demand for instantaneous high power.

[0059] Please refer to Figure 2 , the present invention also proposes a flywheel energy storage battery, including a body 3. The body 3 has a receiving cavity 31. Inside the receiving cavity 31 of the body 3, a flywheel shaft 2, a motor rotor 4, a motor stator 5 and the flywheel rotor as above are provided.

[0060] Among them, both ends of the flywheel shaft 2 are rotatably matched with the body 3. The flywheel rotor and the motor rotor 4 are respectively sleeved on the flywheel shaft 2. The motor stator 5 is sleeved outside the flywheel rotor and is installed at the other end on the body 3.

[0061] It should be noted that a top cover 32 is provided at the top of the body 3, and a bottom cover 33 is provided at the bottom of the body 3. The top cover 32 and the bottom cover 33 are respectively threadedly connected to the body 3. The top cover 32 and the bottom cover 33 are used to seal the receiving cavity 31.

[0062] It can be seen that a flange is provided circumferentially at the top of the fuselage 3, and the top cover 32 is connected to the flange by at least two threaded connectors; similarly, a flange is also provided at the bottom of the fuselage 3, and the bottom cover 33 is connected to the flange by at least two threaded connectors. The setting of the flange facilitates the connection of the fuselage 3 with the top cover 32 and the bottom cover 33 through the threaded connectors.

[0063] The number of threaded connectors installed between the fuselage 3 and the top cover 32 and between the fuselage 3 and the bottom cover 33 can be two, three, four, etc., which can be determined according to actual needs and are not limited herein.

[0064] It can be seen that a first bearing 321 is provided inside the top cover 32, and one end of the flywheel shaft 2 is rotationally engaged with the first bearing 321; a second bearing 331 is provided inside the bottom cover 33, and one end of the flywheel shaft 2 is rotationally engaged with the second bearing 331.

[0065] The first bearing 321 and the second bearing 331 are respectively thrust bearings, and the first bearing 321 and the second bearing 331 respectively support both ends of the flywheel shaft 2.

[0066] Furthermore, a magnetic bearing upper bracket 322, a first permanent magnetic bearing outer ring 323, and a first permanent magnetic bearing inner ring 324 are provided on the side of the first bearing 321 facing the second bearing 331; the first permanent magnetic bearing inner ring 324 is sleeved outside the flywheel shaft 2, the first permanent magnetic bearing outer ring 323 is sleeved on the first permanent magnetic bearing inner ring 324 and installed on the magnetic bearing upper bracket 322, and one end of the magnetic bearing upper bracket 322 is installed on the fuselage 3.

[0067] A magnetic bearing lower bracket 332, a second permanent magnetic bearing outer ring 333, and a second permanent magnetic bearing inner ring 334 are provided on the side of the second bearing 331 facing the first bearing 321; the second permanent magnetic bearing inner ring 334 is sleeved outside the flywheel shaft 2, the second permanent magnetic bearing outer ring 333 is sleeved on the second permanent magnetic bearing inner ring 334 and installed on the magnetic bearing lower bracket 332, and one end of the magnetic bearing lower bracket 332 is installed on the fuselage 3.

[0068] It can be seen that a set of permanent magnetic bearings is provided on each side of the flywheel shaft 2 to ensure the stable suspension and efficient operation of the flywheel rotor.

[0069] That is to say, the present invention adopts a hybrid bearing configuration to solve the limitations of permanent magnetic bearings in the axial direction and at the same time take into account radial support.

[0070] Specifically, the permanent magnetic bearing provides radial suspension through the repulsive force or attractive force of the permanent magnet, but its axial bearing capacity is weak and it is difficult to independently cope with the axial dynamic load during high-speed rotation.

[0071] The thrust bearings on both sides of the permanent magnetic bearing are used to axially position the flywheel rotor, and thus the rotor can be prevented from shifting or colliding due to the axial force of the flywheel rotor.

[0072] When the flywheel rotates at high speed, the gyroscopic effect will cause axial swing and vibration of the flywheel rotor. The first bearing 321 and the second bearing 331 are symmetrically arranged at both ends of the flywheel rotor, and can cooperate with the two permanent magnet bearings to form axial damping to suppress vibration. Moreover, when external acceleration or impact may cause the flywheel shaft 2 to deviate, the first bearing 321 and the second bearing 331 can respond quickly to keep the flywheel rotor centered.

[0073] Please refer to Figure 2 and Figure 3 , the upper magnetic bearing bracket 322 and the lower magnetic bearing bracket 332 are respectively connected to the fuselage 3 through threaded connectors.

[0074] It should be noted that the upper magnetic bearing bracket 322 and the lower magnetic bearing bracket 332 are integrally annular, and three or four threaded connectors can be arranged along their circumferences to connect the upper magnetic bearing bracket 322 and the lower magnetic bearing bracket 332 to the fuselage 3. The specific number of threaded connectors is not limited here.

[0075] In one embodiment, a support frame 51 is provided outside the motor stator 5. The support frame 51 is connected to the fuselage 3 through threaded connectors; the motor stator 5 is installed on the support frame 51, and the motor rotor 4 is welded to the flywheel shaft 2.

[0076] The support frame 51 can be integrally annular, and can be connected to the fuselage 3 through three or four threaded connectors circumferentially. The specific number is not limited here.

[0077] In one embodiment, an electromagnetic bearing 6 is further provided between the flywheel rotor and the support frame 51; the electromagnetic bearing 6 is made of neodymium iron boron.

[0078] It can be seen that the flywheel rotor of the present invention is welded to the flywheel shaft 2, thereby meeting the rigidity requirements of the overall flywheel structure, avoiding loosening, fretting or mass asymmetry of mechanical connections, and being beneficial to improving the structural integrity and dynamic balance stability of the rotor system.

[0079] The electromagnetic bearing 6 is used to provide non-contact suspension, eliminate mechanical friction, achieve ultra-high speed and zero wear operation, and can meet the rapid response requirements of high-frequency charge and discharge.

[0080] It can be seen that because the flywheel rotor is welded to the flywheel shaft 2, although its rigidity can be improved, the vibration of the flywheel rotor caused by mass imbalance, external impact or gyroscopic effect cannot be eliminated. Therefore, the present invention further adopts the electromagnetic bearing 6, and by dynamically adjusting the electromagnetic force of the electromagnetic bearing 6, the vibration can be actively suppressed, and the disturbance influence of external acceleration and bumps on the system can be reduced.

[0081] Please continue to refer to Figure 3, the flywheel energy storage battery provided by the present invention can ensure the sealing performance of the accommodating cavity 31 by means of the cooperation between the body 3, the top cover 32 and the bottom cover 33. At the same time, the upper, middle and lower parts inside the body 3 are respectively provided with a magnetic bearing upper support 322, a support frame 51 and a magnetic bearing lower support 332, thereby improving the strength and reliability of the overall structure of the body 3.

[0082] Specifically, the body 3, the top cover 32 and the bottom cover 33 are respectively made of stainless steel and fiberglass composite materials, thus having sufficient mechanical strength to withstand the influence of external collisions, vibrations and other factors, and ensuring the safe and stable operation of the flywheel energy storage battery.

[0083] Moreover, a detachable connection method is adopted between the body 3 and the top cover 32 and the bottom cover 33, which is convenient for maintenance personnel to overhaul and maintain the inside thereof, and avoids unnecessary damage to the equipment during the maintenance process.

[0084] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0085] The present application uses specific terms to describe the embodiments of the present application. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification is not necessarily the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the present application can be combined appropriately.

[0086] Although the present invention is disclosed above with preferred embodiments, it is not used to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A flywheel rotor, characterized in that: include: The main body has a matching hole in the middle, and the matching hole is used to match with the flywheel shaft; The body is provided with a weight-reducing groove on opposite sides of the matching hole, and the weight-reducing groove is arranged radially and circumferentially around the body; wherein, A carbon fiber layer is wound around the outer periphery of the body.

2. The flywheel rotor according to claim 1, characterized in that: The two weight-reducing grooves are respectively arranged close to the matching hole along the radial direction of the main body, and the two weight-reducing grooves are symmetrically arranged with the axis of the matching hole as a reference.

3. The flywheel rotor according to claim 1, characterized in that: A hollow cavity is circumferentially arranged in the body around the matching hole; The hollow chamber is communicated with the matching hole.

4. A flywheel energy storage battery, characterized in that: include: A body having a receiving cavity; It also includes a flywheel shaft, a motor rotor, a motor stator and a flywheel rotor as claimed in any one of claims 1 to 3, which are arranged in the accommodating cavity; wherein, A flywheel shaft, both ends of which are respectively rotatably matched with the fuselage; The flywheel rotor and the motor rotor are respectively sleeved on the flywheel shaft, and the motor stator is sleeved on the outer side of the flywheel rotor and installed on the fuselage.

5. The flywheel energy storage battery according to claim 4, characterized in that: A top cover is provided on the top of the fuselage, and a bottom cover is provided on the bottom of the fuselage. The top cover and the bottom cover are respectively threadedly connected to the fuselage, and the top cover and the bottom cover are used to seal the accommodating cavity.

6. The flywheel energy storage battery according to claim 5, characterized in that: A first bearing is disposed on the inner side of the top cover, and one end of the flywheel shaft is rotatably matched with the first bearing; A second bearing is disposed on the inner side of the bottom cover, and one end of the flywheel shaft is rotatably matched with the second bearing.

7. The flywheel energy storage battery according to claim 6, characterized in that: A magnetic bearing upper bracket, a first permanent magnetic bearing outer ring and a first permanent magnetic bearing inner ring are provided on the side of the first bearing facing the second bearing; the first permanent magnetic bearing inner ring is sleeved on the outside of the flywheel shaft, the first permanent magnetic bearing outer ring is sleeved on the first permanent magnetic bearing inner ring and installed on the magnetic bearing upper bracket, and one end of the magnetic bearing upper bracket is installed on the fuselage; The second bearing is provided with a magnetic bearing lower bracket, a second permanent magnetic bearing outer ring and a second permanent magnetic bearing inner ring on the side facing the first bearing; the second permanent magnetic bearing inner ring is sleeved on the outside of the flywheel shaft, the second permanent magnetic bearing outer ring is sleeved on the second permanent magnetic bearing inner ring and installed on the magnetic bearing lower bracket, and one end of the magnetic bearing lower bracket is installed on the fuselage.

8. The flywheel energy storage battery according to claim 7, characterized in that: The magnetic bearing upper bracket and the magnetic bearing lower bracket are connected to the fuselage through threaded connectors respectively.

9. The flywheel energy storage battery according to claim 4, characterized in that: A support frame is provided on the outside of the motor stator, and the support frame is connected to the fuselage through a threaded connector; The motor stator is mounted on the support frame, and the motor rotor is welded to the flywheel shaft.

10. The flywheel energy storage battery according to claim 9, characterized in that: An electromagnetic bearing is also provided between the flywheel rotor and the support frame; The electromagnetic bearing is made of neodymium iron boron.

Images