Wheel hub and flywheel energy storage device

Abstract

The present invention discloses a wheel hub and a flywheel energy storage device. The wheel hub includes a hub body made of carbon fiber and comprising a mounting portion and an expansion portion connected to each other. In a projection plane orthogonal to the axial direction of the hub body, the projection of the mounting portion is located within the expansion portion. The expansion portion is suitable for mounting an energy storage ring, while the mounting portion is suitable for mounting a power generation assembly. When the wheel hub rotates, the expansion portion expands to increase the radial deformation of the expansion portion in the hub body. The expansion of the expansion portion also limits the axial deformation of the mounting portion in the hub body, thereby reducing the range of movement of the power generation assembly in the mounting portion. The wheel hub has the advantages of simple structure and high safety performance.

Description

Technical Field

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

[0002] Flywheel energy storage is the storage and release of electrical energy by increasing and decreasing the rotational speed of a composite flywheel. When there is excess electrical energy, the rotational speed of the composite flywheel is increased by an electric motor, thereby storing the electrical energy in the composite flywheel as kinetic energy. When there is insufficient electrical energy, the rotational speed of the composite flywheel is reduced to drive the generator, converting the kinetic energy stored in the composite flywheel into electrical energy.

[0003] In related technologies, the elastic modulus of carbon fiber composite materials and metal materials is significantly different, which leads to easy interface 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 one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a wheel hub with a simple structure that is not easily separated from the carbon fiber composite material.

[0006] The embodiments of the present invention provide a flywheel energy storage device with a simple structure, high energy storage density and strong safety performance.

[0007] The wheel hub according to an embodiment of the present invention includes: a wheel hub body, which is made of a composite material and includes a mounting portion and an expansion portion connected to each other, and in a projection plane orthogonal to the axial direction of the wheel 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 wheel hub rotates, the expansion portion expands to increase the deformation of the expansion portion in the radial direction of the wheel hub body, and the expansion of the expansion portion limits the deformation of the mounting portion in the axial direction of the wheel hub body to reduce the movement range of the external device in the mounting portion.

[0008] The wheel hub of the embodiment of the present invention can expand outward synchronously with the energy storage ring during high-speed rotation through the expansion part, thereby preventing the energy storage ring from separating from the wheel hub. The deformation of the mounting part is small, and a mounting base can be provided for external devices to ensure the normal operation of the external devices. The wheel hub body is made of carbon fiber material, which reduces the weight of the wheel hub body and improves 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 both ends of the mounting part and connected to the two ends of the mounting part, the energy storage ring is arranged outside the hub body and the inner circumference of the energy storage ring is in contact with the first expansion part and the second expansion part. When the hub rotates, the first expansion part and the second expansion part both expand to increase the radial deformation of the first expansion part and the second expansion part in the hub body, and the first expansion part and the second expansion part cooperate to limit the axial deformation of the mounting part in the hub body to reduce the movement range of the external device in the mounting part.

[0010] In some embodiments, 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, the cross-sectional area of ​​the inner circumference of the second section gradually increases in a direction away from the mounting portion, and the cross-sectional area of ​​the 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, 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 a direction away from the mounting portion, and the cross-sectional area of ​​the outer circumference of the fourth section is constant in a direction away from the mounting portion, and the energy storage ring is provided 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, 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 by 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.

[0012] In some embodiments, each of the hub units includes a first sublayer, a second sublayer and multiple third sublayers, the multiple first sublayers are arranged in sequence along the radial direction of the hub body, the first sublayer and the second sublayer are arranged between two adjacent first sublayers, the winding directions of the multiple third sublayers are orthogonal to the axial direction of the hub body, the winding direction of the first sublayer intersects with the winding direction of the third sublayer at a first angle, the winding direction of the second sublayer intersects with the winding direction of the third sublayer at a second angle, and in a projection plane orthogonal to the radial direction of the hub body, the first angle and the second angle are equal in size and the first angle and the second angle are symmetrically arranged with respect to the radial direction of the hub body.

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

[0014] In some embodiments, the power generation component includes: a support shaft, the support shaft is passed through the wheel hub and the outer circumference of the support shaft and the inner circumference of the mounting portion of the wheel hub are spaced apart to form a mounting cavity; a stator assembly, the stator assembly is provided on the support shaft and is located in the mounting cavity; a rotor assembly, the rotor assembly is provided in the inner circumference of the mounting portion of the wheel hub and is connected to the mounting portion so that the rotor assembly rotates synchronously with the wheel hub, the rotor assembly is located in the mounting cavity and the rotor assembly and the stator assembly are relatively spaced apart along the radial direction of the wheel hub.

[0015] In some embodiments, the support shaft is provided with a through hole that penetrates the support shaft along its axial direction, and the through hole is suitable for passing a cooling medium or a wire.

[0016] In some embodiments, the flywheel energy storage device also 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 arranged in the mounting cavity and passed through 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 is arranged adjacent to one end of the support shaft, the support shaft and the protrusion are arranged relative to each other in the up and down directions, and the axial magnetic bearing is arranged 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 extension direction of the inner circumferential surface 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 circumferential surface of the hub body intersects with the radial direction at a fourth angle, and the third angle and the fourth angle are equal. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 22 is a schematic structural diagram of a wheel hub according to an embodiment of the present invention.

[0020] Figure 3 Schematic diagram of the winding of the hub according to an embodiment of the present invention.

[0021] Figure 4 Schematic diagram of the structure of the energy storage ring of the flywheel energy storage device according to an embodiment of the present invention.

[0022] 100. Flywheel energy storage device;

[0023] 1. Energy storage component; 2. Energy storage ring; 3. Power generation component; 31. Support shaft; 311. Through hole; 312. Protrusion; 32. Stator assembly; 33. Rotor assembly; 4. First radial magnetic bearing; 5. Second radial magnetic bearing; 6. Fixing ring; 7. Axial magnetic bearing; 8. Hub; 9. Hub body; 91. Mounting portion; 92. Expansion portion; 921. First expansion portion; 9211. First section; 9212. Second section; 922. Second expansion portion; 9221. Third section; 9222. Fourth section; 93. Hub unit; 931. First sublayer; 932. Second sublayer; 933. Third sublayer. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] The following describes a wheel hub according to an embodiment of the present invention with reference to the accompanying drawings.

[0026] like Figure 1-4 As shown, the hub 8 according to the embodiment of the present invention includes a hub body 9.

[0027] The hub body 9 is made of composite material and includes a mounting portion 91 and an expansion portion 92 connected to each other. Figure 2 The projection of the mounting portion 91 is located inside the expansion portion 92. The outside of the expansion portion 92 is suitable for mounting the energy storage ring 2. The inside of the mounting portion 91 is suitable for mounting an external device. When the hub 8 rotates, the expansion portion 92 expands to increase the radial direction of the expansion portion 92 in the hub body 9 (as shown in FIG. Figure 2 The expansion portion 92 expands to limit the deformation of the mounting portion 91 in the axial direction of the hub body 9 to reduce the range of movement of the external device in the mounting portion 91. Specifically, as Figure 2As shown, the hub body 9 can be annular and made of a composite material (for example, carbon fiber material) and the same material as the energy storage ring 2. The diameter of the expansion portion 92 is larger than the diameter of the mounting portion 91. The energy storage ring 2 is arranged on the outer peripheral side of the expansion portion 92 and is connected by adhesive. The external device (the external device can be a power generation component 3 and a magnetic bearing) is installed in the mounting portion 91, so that the mounting portion 91 and the expansion portion 92 provide a mounting base for the external device and the energy storage ring 2 respectively. When the hub 8 rotates at high speed, since the material of the hub body 9 is the same as that of the energy storage ring 2, the expansion portion 92 and the energy storage ring 2 expand outward synchronously, preventing the expansion portion 92 from separating from the energy storage ring 2, thereby increasing the service life of the energy storage ring 2. At the same time, the expansion portion 92 can limit the deformation of the mounting portion 91, thereby reducing the movement range of the external device in the mounting portion 91 and ensuring the working efficiency of the external device.

[0028] The hub 8 of the embodiment of the present invention can expand outward synchronously with the energy storage ring 2 during high-speed rotation through the expansion portion 92, thereby solving the problem of separation of the energy storage ring 2 and the hub 8 caused by large deformation of the energy storage ring 2 in the related art. The deformation of the mounting portion 91 is small, which can provide an installation basis for external devices and ensure the normal operation of the external devices. In addition, the hub body 9 is made of composite materials, which reduces the weight of the hub body 9 and improves the energy storage density of the flywheel rotor.

[0029] In some embodiments, the expansion portion 92 includes a first expansion portion 921 and a second expansion portion 922, the first expansion portion 921 and the second expansion portion 922 are respectively provided at both ends of the mounting portion 91 and connected to both ends of the mounting portion 91, the energy storage ring 2 is provided outside the hub body 9 and the inner circumference of the energy storage ring 2 is in contact with the first expansion portion 921 and the second expansion portion 922. When the hub 8 rotates, the first expansion portion 921 and the second expansion portion 922 both expand to increase the radial deformation of the first expansion portion 921 and the second expansion portion 922 in the hub body 9, and the first expansion portion 921 and the second expansion portion 922 cooperate to limit the axial deformation of the mounting portion 91 in the hub body 9 to reduce the movement range of the external device in the mounting portion 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 mounting part 91 and are connected to the upper and lower ends of the mounting part 91. The diameter of the first expansion part 921 and the diameter of the second expansion part 922 are both larger than the diameter of the mounting part 91. The energy storage ring 2 is arranged outside the hub body 9 and is bonded to the outer circumferential surfaces of the first expansion part 921 and the second expansion part 922 by adhesive, so that the energy storage ring 2 is installed on the first expansion part 921 and the second expansion part 922. When the hub 8 rotates at high speed, the first expansion part 921 and the second expansion part 922 are deformed 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 mounting part 91 to reduce the movement range of the external device in the mounting part 91 and ensure the working efficiency of the external device.

[0030] In some embodiments, the first expansion portion 921 includes a first section 9211 and a second section 9212 connected to each other, the two ends of the second section 9212 are respectively connected to one end of the mounting portion 91 and one end of the first section 9211, the cross-sectional area of ​​the inner circumference of the second section 9212 gradually increases in the direction away from the mounting portion 91, and the cross-sectional area of ​​the outer circumference of the first section 9211 is constant in the direction away from the mounting portion 91, the second expansion portion 922 includes a third section 9221 and a fourth section 9222 connected to each other, the two ends of the third section 9221 are respectively connected to the other end of the mounting portion 91 and one end of the fourth section 9222, the cross-sectional area of ​​the inner circumference of the third section 9221 gradually increases in the direction away from the mounting portion 91, and the cross-sectional area of ​​the outer circumference of the fourth section 9222 is constant in the direction away from the mounting portion 91, and the energy storage ring 2 is provided on the first section 9211 and the fourth section 9222.

[0031] Specifically, if Figure 2As shown, the outer circumference of the first section 9211 and the fourth section 9222 can be cylindrical with a constant cross-sectional area in the up-down direction, so that the first section 9211 and the fourth section 9222 provide stable radial support for the energy storage ring 2, which is convenient for 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 a trumpet-shaped cross-sectional area that gradually increases from bottom to top. The third section 9221 is provided between the fourth end and the mounting portion 91, and the upper and lower ends of the third section 9221 are respectively connected to the fourth end and the mounting portion 91. 1 is connected, and the third section 9221 is a trumpet-shaped cross-sectional area that gradually increases from top to bottom. Because the hub 8 and the energy storage ring 2 are made of the same material system, the thermal expansion coefficients and mechanical properties of the hub 8 and the energy storage ring 2 are consistent. 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 into one piece using a high-performance structural adhesive. Due to the identical materials and completely matched interface dimensions, they can achieve coordinated deformation when subjected to force, preventing separation between the hub 8 and the energy storage ring 2, avoiding local deformation mutations that affect dynamic balance, and ensuring energy storage efficiency.

[0032] When the hub 8 rotates at high speed, since the diameter of the expansion portion 92 is larger than the diameter 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 smaller than the centrifugal force on the expansion portion 92. Therefore, the deformation of the mounting portion 91 is also smaller than the deformation of the expansion portion 92. In addition, while the hub body 9 undergoes a large deformation in its radial direction, the hub body 9 also contracts in the axial direction. Due to the configuration of the second section 9212 and the third section 9221, the contraction force pushes the mounting portion 91 inward. The coordinated deformation of the second section 9212 and the third section 9221 keeps the radial displacement of the mounting portion 91 almost unchanged under high-speed rotation, thereby making the configuration of the hub body 9 more reasonable and improving the installation efficiency of the power generation assembly 3.

[0033] In some embodiments, the hub body 9 includes a plurality of hub units 93 sequentially arranged along the radial direction of the hub body 9. The hub unit 93 includes a plurality of sub-layers sequentially arranged along the radial direction of the hub body 9. Each sub-layer is wound with carbon fibers. 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 different. Specifically, Figure 3As shown, multiple hub units 93 are all annular and multiple hub units 93 are arranged in sequence along the inner and outer directions, and each hub 8 includes multiple sub-layers arranged in sequence along the inner and outer directions, each sub-layer is annular and formed by carbon fiber wrapped around a mold, and the winding angles of two adjacent sub-layers are different. Therefore, by changing the winding angle of the sub-layer, 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 torsion and bending stress. 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 resistance of the hub body 9 can be enhanced to withstand centrifugal force and radial load.

[0034] In some embodiments, each hub unit 93 includes a first sublayer 931, a second sublayer 932 and a plurality of third sublayers 933, the plurality of first sublayers 931 are sequentially arranged along the radial direction of the hub body 9, the first sublayer 931 and the second sublayer 932 are arranged between two adjacent first sublayers 931, the winding directions of the plurality of third sublayers 933 are orthogonal to the axial direction of the hub body 9, the winding direction of the first sublayer 931 intersects with the winding direction of the third sublayer 933 at a first angle, the winding direction of the second sublayer 932 intersects with the winding direction of the third sublayer 933 at a second angle, and in a projection plane orthogonal to the radial direction of the hub body 9, 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 9. Specifically, as Figure 3 As shown, each hub unit 93 includes a first sublayer 931, a second sublayer 932 and multiple third sublayers 933, and the multiple third sublayers 933 are all wound in sequence around the inward and outward directions, and the winding direction of the third sublayer 933 intersects with the axial direction of the hub body 9 at 90°, thereby improving the ability of the hub body 9 to resist centrifugal force and impact load in the radial direction through the third sublayer 933, the first sublayer 931 and the second sublayer 932 are located between the multiple third sublayers 933, the winding direction of the first sublayer 931 and the winding direction of the third sublayer 933 intersect at a first angle, the winding direction of the second sublayer 932 and the winding direction of the third sublayer 933 intersect at a second angle, the size of the first angle and the size of the second angle are equal and are both 15°-30°, and the first angle and the second angle are symmetrical about the inward and outward directions, thereby improving the ability of the hub unit 9 to resist centrifugal force and impact load in the axial direction through the first sublayer 931 or the second sublayer 932.

[0035] In some embodiments, the number of the first sub-layer 931 and the number of the second sub-layer 932 are both multiple, and the multiple first sub-layers 931 and the multiple second sub-layers 932 are alternately arranged one by one along the inner and outer directions, 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.

[0036] The flywheel energy storage device 100 according to the embodiment of the present invention includes an energy storage component 1 and a power generation component 3 .

[0037] The energy storage assembly 1 includes a hub 8 and an energy storage ring 2. The hub 8 is the hub 8 of any one of the above embodiments. 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 As shown, the energy storage assembly 1 is arranged in a shell and the shell 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 circumference of the hub 8. The energy storage ring 2 and the outer circumference of the hub 8 are bonded by adhesive.

[0038] The power generation component 3 is arranged in the mounting portion 91 of the wheel hub 8 and is connected to the wheel 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 component 3 drives the wheel hub 8 to rotate so that the electric energy generated by the power generation component 3 is stored in the energy storage component 1. In the energy release state, the energy storage component 1 drives the power generation component 3 to rotate so that the energy storage component 1 drives the power generation component 3 to generate electricity. Specifically, Figure 1 As shown, the power generation component 3 is arranged in the wheel hub 8 and the power generation component 3 is connected to the wheel hub 8. When the flywheel energy storage device 100 stores energy, the power generation component 3 drives the energy storage ring 2 to rotate through the wheel hub 8, converts the electrical energy of the power generation component 3 into 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 component 3 to rotate through the wheel hub 8, so that the power generation component 3 generates electricity, converts the kinetic energy of the energy storage ring 2 into electrical energy of the power generation component 3, and supplies power to external equipment through the power generation component 3.

[0039] The flywheel energy storage device 100 of the embodiment of the present invention is provided with a hub 8, which reduces the weight of the flywheel energy storage device 100, improves the energy storage density of the flywheel energy storage device 100, and avoids separation of the hub 8 and the energy storage ring 2, thereby increasing the safety performance of the flywheel energy storage device 100.

[0040] In some embodiments, the power generation assembly 3 includes a support shaft 31 , a stator assembly 32 , and a rotor assembly 33 .

[0041] The support shaft 31 is passed through the wheel hub 8 and the outer circumference of the support shaft 31 and the inner circumference of the mounting portion 91 of the wheel hub 8 are spaced apart to form a mounting cavity. Figure 1As shown, the support shaft 31 is a vertical shaft extending in the up-down direction. The support shaft 31 is passed through the wheel hub 8 and the outer circumference of the support shaft 31 and the inner circumference of the mounting portion 91 are spaced apart in the inner-outer direction to form a mounting cavity.

[0042] The stator assembly 32 is provided on the support shaft 31 and is located in the mounting cavity. Figure 1 As shown, the stator assembly 32 is mounted on the supporting shaft 31 and is located in the mounting cavity.

[0043] The rotor assembly 33 is arranged within the inner circumference of the mounting portion 91 of the hub 8 and is connected to the mounting portion 91 so that the rotor assembly 33 and the hub 8 rotate synchronously. The rotor assembly 33 is located in the mounting cavity and the rotor assembly 33 and the stator assembly 32 are arranged opposite to each other along the radial direction of the hub 8. Specifically, Figure 1 As shown, the rotor assembly 33 is sleeved on the outer circumferential surface of the stator assembly 32 and the outer circumferential surface of the rotor assembly 33 is connected to the inner circumferential surface of the mounting portion 91 by adhesive, so that the hub body 9 drives the rotor assembly 33 to rotate. Therefore, when the flywheel energy storage device 100 needs to store energy, the rotor assembly 33 is driven to rotate by supplying power to the power generation component 3, 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 component 3 generates electricity.

[0044] 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 .

[0045] The first radial magnetic bearing 4 and the second radial magnetic bearing 5 are both arranged in the installation cavity and pass through the support shaft 31, and the stator assembly 32 and the rotor assembly 33 are both arranged between the first radial magnetic bearing 4 and the second radial magnetic bearing 5. Specifically, Figure 1 As shown, the first radial magnetic bearing 4 and the second radial magnetic bearing 5 are both passed through the support shaft 31 and are both installed in the hub body 9. The first radial magnetic bearing 4 and the second radial magnetic bearing 5 are arranged relative to each other in the up and down directions, and the power generation component 3 is located between the first radial magnetic bearing 4 and the second radial magnetic bearing 5, so that the hub body 9 is radially positioned by the first radial magnetic bearing 4 and the second radial magnetic bearing 5, so that the hub body 9 can be rotatably passed through the support shaft 31.

[0046] One end of the support shaft 31 has a protrusion 312, the fixing ring 6 is arranged in the hub body 9 and adjacent to one end of the support shaft 31, the support shaft 31 and the protrusion 312 are arranged opposite to each other in the vertical direction, and the axial magnetic bearing 7 is arranged between the support shaft 31 and the protrusion 312. Specifically, as Figure 1As shown, the lower end of the support shaft 31 is provided with a protrusion 312 extending in the inward and outward directions, the fixing ring 6 is fixed on the inner circumferential surface of the lower end of the hub body 9, the protrusion 312 and the fixing ring 6 are arranged relative to each other in the up and down directions, a part of the axial magnetic bearing 7 is arranged in the lower end surface of the protrusion 312, and the other 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 can be rotatably passed through the support shaft 31.

[0047] It is worth noting that the first radial magnetic bearing 4 , the second radial magnetic bearing 5 and the axial magnetic bearing 7 all adopt Halbach structure magnetic bearings.

[0048] In some embodiments, the fixing ring 6 is a metal ring and the fixing ring 6 includes a first part, a second part and a third part that are connected. The first part and the third part are both 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 circumferential surface of the second part is a gradually decreasing trumpet shape. The fixing ring 6 is inserted into the lower end portion of the hub body 9, and the first part is inserted into the mounting portion 91, the second part is inserted into the third section 9221, and the third part is inserted into the fourth section 9222. The lower end face of the third part is spaced relative to the upper end face of the protrusion 312, and the axial magnetic bearing 7 is arranged between the third part and the protrusion 312. Thus, the fixing ring 6 provides an installation foundation for the axial magnetic bearing 7.

[0049] In some embodiments, the support shaft 31 is provided with a through hole 311 that passes through the support shaft 31 along its axial direction, and the through hole 311 is suitable for passing a cooling medium or a wire. Figure 1 As shown, the support shaft 31 has a through hole 311 that passes through the support shaft 31 in the up and down directions. When the flywheel rotates at high speed, the first radial magnetic bearing 4, the second radial magnetic bearing 5, the axial magnetic bearing 7, and the rotor assembly 33 will generate a large amount of heat. Cooling liquid or cold air can be introduced into the through hole 311 to cool the support shaft 31 and dissipate heat, thereby cooling the flywheel energy storage device 100. In addition, the through hole 311 can accommodate some power supply or signal lines to provide power transmission for the power generation component 3.

[0050] In some embodiments, in a projection plane orthogonal to the radial direction of the hub body 9, the extension direction of the inner circumference of the energy storage ring 2 intersects the radial direction of the hub body 9 at a third angle, and the extension direction of the outer circumference of the hub body 9 intersects the radial direction of the hub body 9 at a fourth angle, and the third angle and the fourth angle are equal. Specifically, Figure 1-Figure 4As shown, in order to ensure that the energy storage ring 2 can be smoothly ejected from the mold, the energy storage ring mold is set to a cone shape to reduce the demoulding resistance of the energy storage ring 2. The extension direction of the inner circumference of the energy storage ring 2 after demoulding intersects with the inner and outer directions to form a third angle b, and the extension direction of the outer circumference 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. Therefore, when the energy storage ring 2 is installed on the expansion part of the hub body 9, the inner circumference of the energy storage ring 2 and the outer circumference of the hub body 9 can be fitted together, which facilitates the installation of the energy storage ring 2 on the hub body 9 and improves the stability of the installation of the energy storage ring 2.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 therefore should not be understood as limiting the present invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0053] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0055] In the present invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction 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 can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0056] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify 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 being made of a composite material and comprising a mounting portion and an expansion portion connected to each other, wherein, in a projection plane orthogonal to the axial direction of the hub body, the projection of the mounting portion is located within the expansion portion, the outside of the expansion portion is suitable for mounting an energy storage ring, the hub body and the energy storage ring are made of the same material, and the inside of the mounting portion is suitable for mounting an external device, and when the hub rotates, the expansion portion expands to increase the amount of deformation of the expansion portion in the radial direction of the hub body, and the expansion of the expansion portion limits the amount of deformation of the mounting portion in the axial direction of the hub body to reduce the range of movement of the external device in the mounting portion; The expansion portion includes a first expansion portion and a second expansion portion, the first expansion portion and the second expansion portion are respectively provided at both ends of the mounting portion and connected to both ends of the mounting portion, the energy storage ring is provided 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 deformation of the first expansion portion and the second expansion portion in the radial direction of the wheel hub body, and the first expansion portion and the second expansion portion cooperate to limit the deformation of the mounting portion in the axial direction of the wheel hub body to reduce the movement range of the external device in the mounting portion; 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, the cross-sectional area of ​​the inner circumference of the second section gradually increases in a direction away from the mounting portion, and the cross-sectional area of ​​the 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, and 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.

2. The wheel hub according to claim 1, 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 sub-layer 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.

3. The wheel hub according to claim 2, characterized in that Each of the hub units includes 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 the 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.

4. A flywheel energy storage device, characterized in that: include: An energy storage assembly, the energy storage assembly comprising a hub and an energy storage ring, the hub being the hub according to any one of claims 1 to 3, the energy storage ring being arranged on the outer peripheral side of the expansion portion of the 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 electrical 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.

5. The flywheel energy storage device according to claim 4, characterized in that: The power generation component includes: A 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 arranged relative to each other along the radial direction of the hub.

6. The flywheel energy storage device according to claim 5, 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.

7. The flywheel energy storage device according to claim 5, 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 passed through 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 relative to each other in the up and down directions, and the axial magnetic bearing is arranged between the support shaft and the protrusion.

8. The flywheel energy storage device according to claim 5, characterized in that: In a projection plane orthogonal to the radial direction of the hub body, the extension direction of the inner circumferential surface 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 circumferential surface of the hub body intersects with its radial direction at a fourth angle, and the third angle and the fourth angle are equal.

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