Hub and flywheel energy storage device

Abstract

The invention discloses a hub and a flywheel energy storage device.The hub comprises a hub body, the hub body is made of carbon fibers and comprises an installation part and an expansion part which are connected with each other, in a projection plane orthogonal to the axial direction of the hub body, the projection of the installation part is located in the expansion part, and an energy storage ring is suitable for being installed outside the expansion part; and when the hub rotates, the expansion part expands to increase the deformation amount of the expansion part in the radial direction of the hub body, and the expansion part expands to limit the deformation amount of the installation part in the axial direction of the hub body so as to reduce the moving range of the power generation assembly in the installation part. The hub has the advantages of being simple in structure, high in safety performance and the like.

Description

Technical Field

[0001] The present invention relates to the field of energy storage, and particularly to a hub and a flywheel energy storage device. Background Art

[0002] Flywheel energy storage realizes the storage and release of electric energy by increasing and decreasing the rotational speed of a composite flywheel. When there is an excess of electric energy, an electric motor is used to increase the rotational speed of the composite flywheel, thereby storing the electric energy in the form of kinetic energy in the composite flywheel. When the electric energy is insufficient, the rotational speed of the composite flywheel is decreased to drive a generator to work, converting the kinetic energy stored in the composite flywheel into electric energy.

[0003] In related technologies, the significant difference in the elastic modulus between carbon fiber composite materials and metal materials results in the easy interfacial separation between the carbon fiber ring and the metal hub in the energy storage flywheel, reducing the flywheel energy storage density and the safety of the flywheel energy storage device. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related technologies to some extent.

[0005] To this end, an embodiment of the present invention provides a hub with a simple structure and not easily separable from carbon fiber composite materials.

[0006] An embodiment of the present invention provides a flywheel energy storage device with a simple structure, high energy storage density, and strong safety performance.

[0007] The hub according to an embodiment of the present invention includes: a hub body made of a composite material and including an installation part and an expansion part connected to each other. In a projection plane orthogonal to the axial direction of the hub body, the projection of the installation part is located inside the expansion part. An energy storage ring is suitable for being installed outside the expansion part, and an external device is suitable for being installed inside the installation part. When the hub rotates, the expansion part expands to increase the deformation amount of the expansion part in the radial direction of the hub body, and the expansion of the expansion part restricts the deformation amount of the installation part in the axial direction of the hub body to reduce the movement range of the external device inside the installation part.

[0008] In the hub of the embodiment of the present invention, the expansion part can expand outward synchronously with the energy storage ring during high-speed rotation, preventing the energy storage ring from separating from the hub. Moreover, the deformation amount of the installation part is small, which can provide an installation basis for the external device to ensure the normal operation of the external device. The hub body is made of carbon fiber material, reducing the weight of the hub body and increasing the energy storage density of the flywheel rotor.

[0009] In some embodiments, the expansion part includes a first expansion part and a second expansion part. The first expansion part and the second expansion part are respectively arranged at two ends of the installation part and connected to the two ends of the installation part. The energy storage ring is arranged outside the hub body, and the inner circumferential surface of the energy storage ring is attached to the first expansion part and the second expansion part. When the hub rotates, both the first expansion part and the second expansion part expand to increase the deformation amount of the first expansion part and the second expansion part in the radial direction of the hub body, and the first expansion part and the second expansion part cooperate to limit the deformation amount of the installation part in the axial direction of the hub body to reduce the movement range of the external device in the installation part.

[0010] In some embodiments, the first expansion part includes a first section and a second section connected to each other. Two ends of the second section are respectively connected to one end of the installation part and one end of the first section. The cross-sectional area of the inner circumferential surface of the second section gradually increases in the direction away from the installation part, and the cross-sectional area of the outer circumferential surface of the first section is constant in the direction away from the installation part. The second expansion part includes a third section and a fourth section connected to each other. Two ends of the third section are respectively connected to the other end of the installation part and one end of the fourth section. The cross-sectional area of the inner circumferential surface of the third section gradually increases in the direction away from the installation part, and the cross-sectional area of the outer circumferential surface of the fourth section is constant in the direction away from the installation part. The energy storage ring is arranged on the first section and the fourth section.

[0011] In some embodiments, the hub body includes a plurality of hub units arranged in sequence along the radial direction of the hub body. Each hub unit includes a plurality of sub-layers arranged in sequence along the radial direction of the hub body. Each sub-layer is formed by winding carbon fiber. The winding angle of each sub-layer intersects with the axial direction of the hub body and forms an included angle, and the winding angles of two adjacent sub-layers are different.

[0012] In some embodiments, each hub unit includes a first sub-layer, a second sub-layer and a plurality of third sub-layers. The plurality of first sub-layers are arranged in sequence along the radial direction of the hub body. The first sub-layer and the second sub-layer are arranged between two adjacent first sub-layers. The winding directions of the plurality of third sub-layers are all orthogonal to the axial direction of the hub body. The winding direction of the first sub-layer intersects with the winding direction of the third sub-layer to form a first included angle, and the winding direction of the second sub-layer intersects with the winding direction of the third sub-layer to form a second included angle. In a projection plane orthogonal to the radial direction of the hub body, the first included angle and the second included angle are equal in size and the first included angle and the second included angle are symmetrically arranged with respect to the radial direction of the hub body.

[0013] The flywheel energy storage device according to an embodiment of the present invention includes: an energy storage component, the energy storage component includes a hub and an energy storage ring, the hub is the hub described in any one of the above embodiments, and the energy storage ring is provided on the outer peripheral side of the expansion part of the hub; a power generation component, the power generation component is provided in the installation part of the hub and is connected to the hub. The flywheel energy storage device has an energy storage state and an energy release state. In the energy storage state, the power generation component drives the hub to rotate so that the electric energy generated by the power generation component is stored in the energy storage component. In the energy release state, the energy storage component drives the power generation component to rotate so that the energy storage component drives the power generation component to generate electricity.

[0014] In some embodiments, the power generation component includes: a support shaft, the support shaft penetrates through the hub and the outer peripheral surface of the support shaft and the inner peripheral surface of the installation part of the hub are spaced apart to form an installation cavity; a stator component, the stator component is provided on the support shaft and is located in the installation cavity; a rotor component, the rotor component is provided in the inner peripheral surface of the installation part of the hub and is connected to the installation part so that the rotor component rotates synchronously with the hub. The rotor component is located in the installation cavity and the rotor component and the stator component are arranged at intervals relative to each other along the radial direction of the hub.

[0015] In some embodiments, a through hole axially penetrating the support shaft is provided on the support shaft, and the through hole is adapted to allow a cooling medium or a wire to pass through.

[0016] In some embodiments, the flywheel energy storage device further includes: a first radial magnetic bearing and a second radial magnetic bearing. The first radial magnetic bearing and the second radial magnetic bearing are both provided in the installation cavity and penetrate through the support shaft. The stator component and the rotor component are both provided between the first radial magnetic bearing and the second radial magnetic bearing; a fixing ring and an axial magnetic bearing. One end of the support shaft has a protrusion. The fixing ring is provided in the hub body and is arranged adjacent to one end of the support shaft. The support shaft and the protrusion are spaced apart from each other in the up and down direction. The axial magnetic bearing is provided between the support shaft and the protrusion.

[0017] In some embodiments, in a projection plane orthogonal to the radial direction of the hub body, the extending direction of the inner peripheral surface of the energy storage ring intersects with the radial direction of the hub body to form a third included angle, and the extending direction of the outer peripheral surface of the hub body intersects with its radial direction to form a fourth included angle. The third included angle and the fourth included angle are equal. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the flywheel energy storage device according to an embodiment of the present invention.

[0019] Figure 2It is a schematic structural diagram of a hub according to an embodiment of the present invention.

[0020] Figure 3 It is a winding schematic diagram of a hub according to an embodiment of the present invention.

[0021] Figure 4 It is a schematic structural diagram of an energy storage ring of a flywheel energy storage device according to an embodiment of the present invention.

[0022] 100. Flywheel energy storage device; 1. Energy storage component; 2. Energy storage ring; 3. Power generation component; 31. Support shaft; 311. Through hole; 312. Protrusion; 32. Stator component; 33. Rotor component; 4. First radial magnetic bearing; 5. Second radial magnetic bearing; 6. Fixed ring; 7. Axial magnetic bearing; 8. Hub; 9. Hub body; 91. Installation part; 92. Expansion part; 921. First expansion part; 9211. First section; 9212. Second section; 922. Second expansion part; 9221. Third section; 9222. Fourth section; 93. Hub unit; 931. First sub-layer; 932. Second sub-layer; 933. Third sub-layer. Detailed implementation manners

[0023] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0024] The hub according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0025] As Figures 1-4 shown, the hub 8 according to an embodiment of the present invention includes a hub body 9.

[0026] The hub body 9 is made of a composite material and includes an installation part 91 and an expansion part 92 connected to each other. In a projection plane orthogonal to the axial direction of the hub body 9 (such as the up and down direction shown), the projection of the installation part 91 is located inside the expansion part 92. The outside of the expansion part 92 is suitable for installing the energy storage ring 2, and the inside of the installation part 91 is suitable for installing an external device. When the hub 8 rotates, the expansion part 92 expands to increase the deformation amount of the expansion part 92 in the radial direction of the hub body 9 (such as the inside and outside direction shown), and the expansion of the expansion part 92 limits the deformation amount of the installation part 91 in the axial direction of the hub body 9 to reduce the movement range of the external device inside the installation part 91. Specifically, as Figure 2 shown, Figure 2 shown, Figure 2As shown, the hub body 9 can be annular and is made of a composite material (e.g., carbon fiber material) and has the same material as the energy storage ring 2. The diameter of the expansion part 92 is larger than that of the installation part 91. The energy storage ring 2 is arranged on the outer peripheral side of the expansion part 92 and is connected by an adhesive. An external device (the external device can be a power generation component 3 and a magnetic bearing) is installed in the installation part 91, so that the installation part 91 and the expansion part 92 respectively provide an installation basis for the external device and the energy storage ring 2. When the hub 8 rotates at a high speed, since the material of the hub body 9 is the same as that of the energy storage ring 2, the expansion part 92 and the energy storage ring 2 expand outward synchronously, preventing the separation of the expansion part 92 and the energy storage ring 2, and improving the service life of the energy storage ring 2. At the same time, the expansion part 92 can limit the deformation of the installation part 91, thereby reducing the movement range of the external device in the installation part 91 and ensuring the working efficiency of the external device.

[0027] In the hub 8 of the embodiment of the present invention, the expansion part 92 can expand outward synchronously with the energy storage ring 2 during high-speed rotation, solving the problem of separation between the energy storage ring 2 and the hub 8 caused by large deformation of the energy storage ring 2 in the related art. Moreover, the deformation amount of the installation part 91 is small, which can provide an installation basis for the external device and ensure the normal operation of the external device. In addition, the hub body 9 is made of a composite material, reducing the weight of the hub body 9 and increasing the energy storage density of the flywheel rotor.

[0028] In some embodiments, the expansion part 92 includes a first expansion part 921 and a second expansion part 922. The first expansion part 921 and the second expansion part 922 are respectively arranged at both ends of the installation part 91 and are connected to both ends of the installation part 91. The energy storage ring 2 is arranged outside the hub body 9, and the inner peripheral surface of the energy storage ring 2 is attached to the first expansion part 921 and the second expansion part 922. When the hub 8 rotates, both the first expansion part 921 and the second expansion part 922 expand to increase the deformation amount of the first expansion part 921 and the second expansion part 922 in the radial direction of the hub body 9, and the first expansion part 921 and the second expansion part 922 cooperate to limit the deformation amount of the installation part 91 in the axial direction of the hub body 9 to reduce the movement range of the external device in the installation part 91. Specifically, as Figure 2As shown, the first expansion part 921 and the second expansion part 922 are respectively arranged at the upper and lower ends of the installation part 91 and are connected to the upper and lower ends of the installation part 91. The diameters of the first expansion part 921 and the second expansion part 922 are both larger than the diameter of the installation part 91. The energy storage ring 2 is arranged outside the wheel hub body 9 and is adhesively bonded to the outer peripheral surfaces of the first expansion part 921 and the second expansion part 922, so that the energy storage ring 2 is installed on the first expansion part 921 and the second expansion part 922. When the wheel hub 8 rotates at a high speed, both the first expansion part 921 and the second expansion part 922 deform synchronously with the energy storage ring 2, ensuring the stability of the deformation of the energy storage ring 2. In addition, the first expansion part 921 and the second expansion part 922 can respectively limit the deformation of the installation part 91 to reduce the movement range of the external device in the installation part 91 and ensure the working efficiency of the external device.

[0029] In some embodiments, the first expansion part 921 includes a first section 9211 and a second section 9212 that are connected to each other. The two ends of the second section 9212 are respectively connected to one end of the installation part 91 and one end of the first section 9211. The cross-sectional area of the inner peripheral surface of the second section 9212 gradually increases in the direction away from the installation part 91, and the cross-sectional area of the outer peripheral surface of the first section 9211 is constant in the direction away from the installation part 91. The second expansion part 922 includes a third section 9221 and a fourth section 9222 that are connected to each other. The two ends of the third section 9221 are respectively connected to the other end of the installation part 91 and one end of the fourth section 9222. The cross-sectional area of the inner peripheral surface of the third section 9221 gradually increases in the direction away from the installation part 91, and the cross-sectional area of the outer peripheral surface of the fourth section 9222 is constant in the direction away from the installation part 91. The energy storage ring 2 is arranged on the first section 9211 and the fourth section 9222.

[0030] Specifically, as Figure 2As shown, the outer peripheral surfaces of the first section 9211 and the fourth section 9222 can be cylindrical with a constant cross-sectional area in the up and down direction, so that the first section 9211 and the fourth section 9222 provide stable radial support for the energy storage ring 2, facilitating the assembly and bonding of the energy storage ring 2. The second section 9212 is provided between the first section 9211 and the mounting portion 91, and the upper and lower ends of the second section 9212 are respectively connected to the first section 9211 and the mounting portion 91. The second section 9212 is in the shape of a horn with a gradually increasing cross-sectional area from bottom to top. The third section 9221 is provided between the fourth section and the mounting portion 91, and the upper and lower ends of the third section 9221 are respectively connected to the fourth section and the mounting portion 91. The third section 9221 is in the shape of a horn with a gradually increasing cross-sectional area from top to bottom. Since the hub 8 and the energy storage ring 2 adopt the same material system, the thermal expansion coefficients and mechanical properties of the hub 8 and the energy storage ring 2 are the same. Therefore, in the bonding area between the energy storage ring 2 and the hub 8 (the bonding area is the first section 9211 and the fourth section 9222), the hub 8 and the energy storage ring 2 are firmly bonded together by a high-performance structural adhesive. Due to the same material and the completely matching interface dimensions, they can achieve coordinated deformation when stressed, preventing the hub 8 and the energy storage ring 2 from peeling off, avoiding local deformation mutations from affecting the dynamic balance, and ensuring the energy storage efficiency.

[0031] When the hub 8 rotates at a high speed, since the diameter of the expansion portion 92 is larger than that of the mounting portion 91 and the centrifugal force on the hub 8 is proportional to the square of the radius, the centrifugal force on the mounting portion 91 is less than that on the expansion portion 92. Therefore, the deformation amount of the mounting portion 91 is also less than that of the expansion portion 92. In addition, while the hub body 9 undergoes large deformation in its radial direction, the hub body 9 will also contract axially. Due to the settings of the second section 9212 and the third section 9221, the contraction force will push the mounting portion 91 inward. The coordinated deformation of the second section 9212 and the third section 9221 makes the radial displacement of the mounting portion 91 hardly change under high-speed rotation, thus making the setting of the hub body 9 more reasonable and improving the installation efficiency of the power generation assembly 3.

[0032] In some embodiments, the hub body 9 includes a plurality of hub units 93 arranged in sequence along the radial direction of the hub body 9. The hub unit 93 includes a plurality of sub-layers arranged in sequence along the radial direction of the hub body 9. Each sub-layer is formed by winding carbon fiber. The winding angle of each sub-layer forms an angle with the axial direction of the hub body 9, and the winding angles of two adjacent sub-layers are not equal. Specifically, as Figure 3As shown, multiple hub units 93 are all annular and the multiple hub units 93 are arranged in sequence in the inner-outer direction. Each hub 8 includes multiple sub-layers arranged in sequence in the inner-outer direction. Each sub-layer is an annular shape formed by winding carbon fiber around a mold, and the winding angles of two adjacent sub-layers are different. Thus, by changing the winding angle of the sub-layers, the strength and stiffness of the hub body 9 in different directions can be improved. When the angle between the winding angle of the sub-layer and the radial direction of the hub body 9 is 30° - 45°, the radial strength and stiffness of the hub body 9 can be enhanced to resist torsional and bending stresses. When the angle between the winding angle of the sub-layer and the radial direction of the hub body 9 is 45° - 60°, the axial strength and compressive capacity of the hub body 9 can be enhanced to bear centrifugal force and radial load.

[0033] In some embodiments, each hub unit 93 includes a first sub-layer 931, a second sub-layer 932, and multiple third sub-layers 933. The multiple first sub-layers 931 are arranged in sequence in the radial direction of the hub body 9. The first sub-layer 931 and the second sub-layer 932 are arranged between two adjacent first sub-layers 931. The winding directions of the multiple third sub-layers 933 are all orthogonal to the axial direction of the hub body 9. The winding direction of the first sub-layer 931 intersects with the winding direction of the third sub-layer 933 to form a first angle, and the winding direction of the second sub-layer 932 intersects with the winding direction of the third sub-layer 933 to form a second angle. In the projection plane orthogonal to the radial direction of the hub body 9, the magnitudes of the first angle and the second angle are equal and the first angle and the second angle are symmetrically arranged with respect to the radial direction of the hub body 9. Specifically, as Figure 3 shown, each hub unit 93 includes a first sub-layer 931, a second sub-layer 932, and multiple third sub-layers 933. The multiple third sub-layers 933 are all wound in sequence in the inner-outer direction and the winding direction of the third sub-layer 933 intersects with the axial direction of the hub body 9 at 90°. Thus, the ability of the hub body 9 to resist centrifugal force and impact load in the radial direction is improved by the third sub-layer 933. The first sub-layer 931 and the second sub-layer 932 are located between the multiple third sub-layers 933. The winding direction of the first sub-layer 931 intersects with the winding direction of the third sub-layer 933 to form a first angle, and the winding direction of the second sub-layer 932 intersects with the winding direction of the third sub-layer 933 to form a second angle. The magnitudes of the first angle and the second angle are equal and are both 15° - 30°. The first angle and the second angle are symmetric with respect to the inner-outer direction. Thus, the ability of the hub unit 93 to resist centrifugal force and impact load in the axial direction is improved by the first sub-layer 931 or the second sub-layer 932.

[0034] In some embodiments, the number of the first sub-layers 931 and the second sub-layers 932 is plural, and the plural first sub-layers 931 and the plural second sub-layers 932 are alternately arranged one by one in the inner-outer direction, and at least one first sub-layer 931 or second sub-layer 932 is arranged between two adjacent third sub-layers 933, thereby improving the ability of the hub unit 93 to resist centrifugal force and impact load in the axial direction.

[0035] The flywheel energy storage device 100 according to the embodiment of the present invention includes an energy storage assembly 1 and a power generation assembly 3.

[0036] The energy storage assembly 1 includes a hub 8 and an energy storage ring 2. The hub 8 is the hub 8 in any one of the above embodiments, and the energy storage ring 2 is arranged on the outer peripheral side of the expansion portion 92 of the hub 8. Specifically, as Figure 1 shown, the energy storage assembly 1 is arranged in a housing and the housing has a vacuum chamber. The hub 8 is rotatably arranged in the vacuum chamber. The energy storage ring 2 is a carbon fiber composite ring and is sleeved on the outer peripheral surface of the hub 8. The energy storage ring 2 is bonded to the outer peripheral surface of the hub 8 through an adhesive.

[0037] The power generation assembly 3 is arranged in the installation portion 91 of the hub 8 and is connected to the hub 8. The flywheel energy storage device 100 has an energy storage state and an energy release state. In the energy storage state, the power generation assembly 3 drives the hub 8 to rotate so that the electric energy generated by the power generation assembly 3 is stored in the energy storage assembly 1. In the energy release state, the energy storage assembly 1 drives the power generation assembly 3 to rotate so that the energy storage assembly 1 drives the power generation assembly 3 to generate electricity. Specifically, as Figure 1 shown, the power generation assembly 3 is arranged in the hub 8 and the power generation assembly 3 is connected to the hub 8. When the flywheel energy storage device 100 stores energy, the power generation assembly 3 drives the energy storage ring 2 to rotate through the hub 8, converts the electric energy of the power generation assembly 3 into the kinetic energy of the energy storage ring 2 and stores it in the energy storage ring 2. When the flywheel device releases energy, the energy storage ring 2 drives the power generation assembly 3 to rotate through the hub 8, so that the power generation assembly 3 generates electricity, converts the kinetic energy of the energy storage ring 2 into the electric energy of the power generation assembly 3, and supplies power to external devices through the power generation assembly 3.

[0038] For the flywheel energy storage device 100 according to the embodiment of the present invention, by arranging the hub 8, the weight of the flywheel energy storage device 100 is reduced, the energy storage density of the flywheel energy storage device 100 is improved, and the separation between the hub 8 and the energy storage ring 2 is avoided, thereby increasing the safety performance of the flywheel energy storage device 100.

[0039] In some embodiments, the power generation assembly 3 includes a support shaft 31, a stator assembly 32 and a rotor assembly 33.

[0040] The support shaft 31 penetrates through the hub 8 and the outer peripheral surface of the support shaft 31 and the inner peripheral surface of the installation portion 91 of the hub 8 are spaced apart to form an installation cavity. Specifically, as Figure 1As shown, the support shaft 31 is a vertical shaft extending in the up and down direction. The support shaft 31 is inserted into the hub 8, and the outer peripheral surface of the support shaft 31 and the inner peripheral surface of the mounting portion 91 are spaced apart in the inner and outer direction to form a mounting cavity.

[0041] The stator assembly 32 is provided on the support shaft 31 and is located within the mounting cavity. Specifically, as Figure 1 shown, the stator assembly 32 is mounted on the support shaft 31 and is located within the mounting cavity.

[0042] The rotor assembly 33 is provided within the inner peripheral surface of the mounting portion 91 of the hub 8 and is connected to the mounting portion 91 so that the rotor assembly 33 rotates synchronously with the hub 8. The rotor assembly 33 is located within the mounting cavity, and the rotor assembly 33 and the stator assembly 32 are arranged at a radial interval relative to each other along the hub 8. Specifically, as Figure 1 shown, the rotor assembly 33 is sleeved on the outer peripheral surface of the stator assembly 32, and the outer peripheral surface of the rotor assembly 33 is connected to the inner peripheral surface of the mounting portion 91 by adhesive, so that the hub body 9 drives the rotor assembly 33 to rotate. Thus, when the flywheel energy storage device 100 needs to store energy, power is supplied to the power generation assembly 3 to drive the rotor assembly 33 to rotate, and the rotor assembly 33 drives the hub 8 to rotate to convert electrical energy into kinetic energy and store it in the energy storage ring 2. When the flywheel energy storage device 100 needs to release energy, the energy storage ring 2 drives the rotor assembly 33 to rotate so that the power generation assembly 3 generates electricity.

[0043] In some embodiments, the flywheel energy storage device 100 further includes a first radial magnetic bearing 4, a second radial magnetic bearing 5, a fixing ring 6, and an axial magnetic bearing 7.

[0044] Both the first radial magnetic bearing 4 and the second radial magnetic bearing 5 are provided within the mounting cavity and are inserted through the support shaft 31. Both the stator assembly 32 and the rotor assembly 33 are provided between the first radial magnetic bearing 4 and the second radial magnetic bearing 5. Specifically, as Figure 1 shown, both the first radial magnetic bearing 4 and the second radial magnetic bearing 5 are inserted through the support shaft 31 and are both mounted within the hub body 9. The first radial magnetic bearing 4 and the second radial magnetic bearing 5 are arranged at an interval relative to each other in the up and down direction. The power generation assembly 3 is located between the first radial magnetic bearing 4 and the second radial magnetic bearing 5, so as to radially position the hub body 9 through the first radial magnetic bearing 4 and the second radial magnetic bearing 5, such that the hub body 9 is rotatably inserted through the support shaft 31.

[0045] One end of the support shaft 31 has a protrusion 312. The fixing ring 6 is provided within the hub body 9 and is arranged adjacent to one end of the support shaft 31. The support shaft 31 and the protrusion 312 are arranged at an interval relative to each other in the up and down direction. The axial magnetic bearing 7 is provided between the support shaft 31 and the protrusion 312. Specifically, as Figure 1As shown, a protrusion 312 extending in the inner and outer direction is provided at the lower end of the support shaft 31. The fixing ring 6 is fixed to the inner circumferential surface of the lower end portion of the hub body 9. The protrusion 312 and the fixing ring 6 are arranged opposite to each other at an interval in the up and down direction. A part of the axial magnetic bearing 7 is arranged in the lower end surface of the protrusion 312, and another part of the axial magnetic bearing 7 is arranged in the lower end surface of the protrusion 312. The hub body 9 is axially supported by the axial magnetic bearing 7, so that the hub body 9 is rotatably sleeved on the support shaft 31.

[0046] It should be noted that the first radial magnetic bearing 4, the second radial magnetic bearing 5 and the axial magnetic bearing 7 all adopt magnetic bearings with Halbach structure.

[0047] In some embodiments, the fixing ring 6 is a metal ring and the fixing ring 6 includes a connected first part, a second part and a third part. Both the first part and the third part are cylindrical. The diameter of the first part is equal to the diameter of the mounting portion 91, and the diameter of the third part is equal to the diameter of the expansion portion 92. The second part is located between the first part and the third part, and the upper and lower ends of the second part are respectively connected to the first part and the second part. The cross-sectional area of the outer peripheral surface of the second part is a flared shape that gradually decreases. The fixing ring 6 is sleeved on the lower end portion of the hub body 9, and the first part is sleeved in the mounting portion 91, the second part is sleeved in the third section 9221, and the third part is sleeved in the fourth section 9222. The lower end surface of the third part is arranged opposite to the upper end surface of the protrusion 312 at an interval, and the axial magnetic bearing 7 is arranged between the third part and the protrusion 312. Thus, the fixing ring 6 provides an installation basis for the axial magnetic bearing 7.

[0048] In some embodiments, a through hole 311 axially penetrating the support shaft 31 is provided on the support shaft 31. The through hole 311 is adapted to allow a cooling medium or a wire to pass through. Specifically, as Figure 1 shown, the support shaft 31 has a through hole 311 axially penetrating the support shaft 31. Since a large amount of heat is generated by the first radial magnetic bearing 4, the second radial magnetic bearing 5, the axial magnetic bearing 7, and the rotor assembly 33 when the flywheel rotates at a high speed, a coolant or cold air can be passed through the through hole 311 to cool and dissipate heat from the support shaft 31, thereby cooling the flywheel energy storage device 100. In addition, the through hole 311 can accommodate part of the power supply or signal line to provide power transmission for the power generation assembly 3.

[0049] In some embodiments, in the projection plane orthogonal to the radial direction of the hub body 9, the extending direction of the inner circumferential surface of the energy storage ring 2 intersects with the radial direction of the hub body 9 to form a third included angle, and the extending direction of the outer circumferential surface of the hub body 9 intersects with its radial direction to form a fourth included angle. The third included angle and the fourth included angle are equal. Specifically, as Figures 1-4As shown, in order to ensure that the energy storage ring 2 can be smoothly removed from the mold, the energy storage ring mold is set to be conical to reduce the demolding resistance of the energy storage ring 2. The extending direction of the inner peripheral surface of the demolded energy storage ring 2 intersects with the inner and outer directions to form a third angle b, and the extending direction of the outer peripheral surface of the hub body 9 intersects with the inner and outer directions to form a fourth angle a. The third angle and the fourth angle are equal. Thus, when the energy storage ring 2 is installed on the expansion part of the hub body 9, the inner peripheral surface of the energy storage ring 2 can be made to fit the outer peripheral surface of the hub body 9, facilitating the installation of the energy storage ring 2 on the hub body 9 and improving the installation stability of the energy storage ring 2.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0051] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "join", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly defined or limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0054] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0055] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A wheel hub, characterized in that: include: A hub body, the hub body is made of a composite material and includes a mounting portion and an expansion portion which are connected to each other, and in a projection plane orthogonal to the axial direction of the hub body, the projection of the mounting portion is located inside the expansion portion, the outside of the expansion portion is suitable for installing an energy storage ring, and the inside of the mounting portion is suitable for installing an external device, when the hub rotates, the expansion portion expands to increase the radial deformation of the expansion portion in the hub body, and the expansion of the expansion portion limits the axial deformation of the mounting portion in the hub body to reduce the movement range of the external device in the mounting portion.

2. The wheel hub according to claim 1, characterized in that: The expansion portion includes a first expansion portion and a second expansion portion, the first expansion portion and the second expansion portion are respectively arranged at two ends of the mounting portion and connected to the two ends of the mounting portion, the energy storage ring is arranged outside the wheel hub body and the inner circumference of the energy storage ring is in contact with the first expansion portion and the second expansion portion, when the wheel hub rotates, the first expansion portion and the second expansion portion both expand to increase the radial deformation of the first expansion portion and the second expansion portion in the wheel hub body, and the first expansion portion and the second expansion portion cooperate to limit the axial deformation of the mounting portion in the wheel hub body to reduce the movement range of the external device in the mounting portion.

3. The wheel hub according to claim 2, characterized in that: The first expansion portion includes a first section and a second section connected to each other, two ends of the second section are respectively connected to one end of the mounting portion and one end of the first section, a cross-sectional area of ​​an inner circumference of the second section gradually increases in a direction away from the mounting portion, and a cross-sectional area of ​​an outer circumference of the first section is constant in a direction away from the mounting portion, The second expansion portion includes a third section and a fourth section connected to each other, the two ends of the third section are respectively connected to the other end of the mounting portion and one end of the fourth section, the cross-sectional area of ​​the inner circumference of the third section gradually increases in the direction away from the mounting portion, the cross-sectional area of ​​the outer circumference of the fourth section is constant in the direction away from the mounting portion, and the energy storage ring is arranged on the first section and the fourth section.

4. The wheel hub according to claim 2, characterized in that: The hub body includes a plurality of hub units arranged in sequence along the radial direction of the hub body, and the hub unit includes a plurality of sub-layers arranged in sequence along the radial direction of the hub body, each of the sub-layers is wound with carbon fiber, and the winding angle of each sub-layer intersects with the axial direction of the hub body and forms an angle, and the winding angles of two adjacent sub-layers are different.

5. The wheel hub according to claim 4, characterized in that: Each of the hub units comprises a first sublayer, a second sublayer and a plurality of third sublayers, wherein the plurality of first sublayers are sequentially arranged along the radial direction of the hub body, and the first sublayer and the second sublayer are arranged between two adjacent first sublayers. The winding directions of the multiple third sub-layers are all orthogonal to the axial direction of the hub body, the winding direction of the first sub-layer intersects with the winding direction of the third sub-layer at a first angle, and the winding direction of the second sub-layer intersects with the winding direction of the third sub-layer at a second angle. In a radial projection plane orthogonal to the hub body, the first angle and the second angle are equal in size and are symmetrically arranged with respect to the radial direction of the hub body.

6. A flywheel energy storage device, characterized in that: include: An energy storage assembly, the energy storage assembly comprising a wheel hub and an energy storage ring, the wheel hub being the wheel hub described in any one of claims 1 to 5, the energy storage ring being arranged on the outer peripheral side of the expansion portion of the wheel hub; A power generation component is arranged in the mounting portion of the wheel hub and is connected to the wheel hub. The flywheel energy storage device has an energy storage state and an energy release state. In the energy storage state, the power generation component drives the wheel hub to rotate so that the electric energy generated by the power generation component is stored in the energy storage component. In the energy release state, the energy storage component drives the power generation component to rotate so that the energy storage component drives the power generation component to generate electricity.

7. The flywheel energy storage device according to claim 6, characterized in that: The power generation assembly comprises: A support shaft, wherein the support shaft is inserted into the wheel hub and an outer circumferential surface of the support shaft and an inner circumferential surface of the mounting portion of the wheel hub are spaced apart to form a mounting cavity; a stator assembly, the stator assembly being disposed on the support shaft and located in the mounting cavity; A rotor assembly is arranged within the inner circumferential surface of the mounting portion of the hub and is connected to the mounting portion so that the rotor assembly and the hub rotate synchronously. The rotor assembly is located in the mounting cavity and the rotor assembly and the stator assembly are relatively arranged with a radial spacing along the hub.

8. The flywheel energy storage device according to claim 7, characterized in that: The support shaft is provided with a through hole which penetrates the support shaft along its axial direction, and the through hole is suitable for passing a cooling medium or a wire.

9. The flywheel energy storage device according to claim 7, characterized in that: Also includes: a first radial magnetic bearing and a second radial magnetic bearing, wherein the first radial magnetic bearing and the second radial magnetic bearing are both arranged in the mounting cavity and penetrated on the support shaft, and the stator assembly and the rotor assembly are both arranged between the first radial magnetic bearing and the second radial magnetic bearing; A fixing ring and an axial magnetic bearing, one end of the support shaft has a protrusion, the fixing ring is arranged in the hub body and adjacent to one end of the support shaft, the support shaft and the protrusion are arranged opposite to each other in the up and down directions, and the axial magnetic bearing is arranged between the support shaft and the protrusion.

10. The flywheel energy storage device according to claim 7, characterized in that: In a projection plane orthogonal to the radial direction of the hub body, the extension direction of the inner circumference of the energy storage ring intersects with the radial direction of the hub body at a third angle, and the extension direction of the outer circumference of the hub body intersects with the radial direction at a fourth angle, and the third angle is equal to the fourth angle.

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