Flywheel energy storage device and system

Abstract

The invention provides a flywheel energy storage device and system.The flywheel energy storage device comprises a shell, a flywheel, a liquid supply assembly and an air cushion protection assembly, the shell is provided with two protection cavities, and protection bearings are arranged in the protection cavities; the flywheel comprises a wheel disc and a rotating shaft which are connected, the two protection cavities are located at the two ends of the rotating shaft respectively, and the rotating shaft is connected with the protection bearing. The liquid supply assembly is provided with a liquid storage tank which is connected with the protection cavity; the air cushion protection assembly comprises multiple air bags and axial magnetic parts, the multiple air bags are arranged on the two axial sides of the wheel disc respectively, the axial magnetic parts and the air bags are arranged in a one-to-one correspondence mode, the axial magnetic parts are arranged in the air bags, the air bags have the inflation state and the deflation state, the air bags abut against the wheel disc in the inflation state, and the air bags abut against the wheel disc in the deflation state. A gap is arranged between the air bag and the wheel disc. According to the flywheel energy storage device and system disclosed by the invention, the vibration and collision risk of the flywheel can be remarkably reduced, and the stability and safety of operation are ensured.

Description

Technical Field

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

[0002] Flywheel energy storage is a device that converts electrical energy into mechanical kinetic energy and stores energy in a rotating flywheel by driving a motor to make the flywheel rotor reach a high-speed rotation state. During the operation of the flywheel energy storage device, the stability of the flywheel rotor is an important factor affecting the safety of the system. In the related art, flywheel energy storage devices generally use mechanical bearings as the support and protection structure of the flywheel rotor. However, for large-inertia and high-speed energy storage flywheels, the energy and impact force generated when they become unstable far exceed the bearing range of the mechanical bearings, and the response speed and accuracy of the mechanical bearings are limited, making it difficult to effectively intervene in the early stage of flywheel rotor instability, thereby failing to ensure the absolute safety of the flywheel energy storage device under extreme conditions. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0004] During the operation of the flywheel energy storage device, the flywheel rotor usually rotates at a very high speed and has a large moment of inertia, which makes it very easy to become unstable when subjected to external disturbances or internal faults. Once the flywheel rotor becomes unstable, the energy and impact force it generates will pose a serious threat to the entire flywheel energy storage device.

[0005] In the related art, although mechanical bearings can absorb or disperse the vibration and impact force generated by the flywheel rotor during normal operation to a certain extent, their protection capabilities are limited for large-inertia and high-speed energy storage flywheels.

[0006] Specifically, when the flywheel rotor loses stability under high-speed rotation, the energy and impact force it generates far exceed the bearing capacity of the mechanical bearing, which may cause damage to the mechanical bearing and even cause the flywheel rotor to disintegrate. In addition, the response speed and accuracy of the mechanical bearing are limited, making it difficult to effectively intervene in the early stage of the flywheel rotor's instability, thereby failing to prevent the flywheel rotor from further losing control in time. Therefore, in extreme cases, relying solely on the mechanical bearing protection structure cannot ensure the absolute safety of the flywheel energy storage device.

[0007] To this end, an embodiment of the present invention provides a flywheel energy storage device, which includes:

[0008] A housing, wherein the housing has two protection cavities, and a protection bearing is arranged in each of the protection cavities;

[0009] A flywheel, the flywheel comprising a wheel disc and a rotating shaft connected to each other, the two protection chambers are respectively located at two ends of the rotating shaft, and the rotating shaft is connected to the protection bearing;

[0010] A liquid supply component, wherein the liquid supply component has a liquid storage tank, the liquid storage tank is connected to the protection cavity, and the liquid storage tank is used to provide protection liquid to the protection cavity;

[0011] An air cushion protection component, the air cushion protection component includes an airbag and an axial magnetic component, a plurality of airbags are provided, and the plurality of airbags are respectively arranged on both axial sides of the wheel disc, the axial magnetic component is arranged one-to-one with the airbags, the axial magnetic component is arranged in the airbag, the airbag has an inflated state and a deflated state, in the inflated state, the airbag abuts against the wheel disc, and in the deflated state, a gap is provided between the airbag and the wheel disc.

[0012] In summary, the flywheel energy storage device provided by the embodiment of the present invention, through the cooperation between the liquid supply component and the air cushion protection component, effectively guarantees the efficient and stable operation of the flywheel in the energy storage and energy release stages. In particular, when the flywheel becomes unstable, the rapid response and coordinated work of the liquid supply component and the air cushion protection component can significantly reduce the vibration and collision risks of the flywheel, thereby protecting the stability and safety of the entire device.

[0013] In some embodiments, the protection cavity is configured as a vacuum cavity, the liquid supply assembly includes an air intake valve, an oil valve and a liquid supply pipe, the two ends of the liquid supply pipe are correspondingly connected to the liquid storage tank and the protection cavity, the oil valve is provided on the liquid supply pipe to control the on-off of the liquid supply pipe, and the air intake valve is provided on the liquid storage tank to control the air entering the liquid storage tank.

[0014] In some embodiments, the air cushion protection assembly further includes an air source, an air valve and an air supply pipe, the two ends of the air supply pipe are correspondingly connected to the air bag and the air source, the air valve is arranged on the air supply pipe, and the air valve is used to control the on and off of the air supply pipe;

[0015] And / or, the airbag has a contact surface, the contact surface is used to contact the wheel disc, and the contact surface is coated with grease;

[0016] And / or, two airbags are provided, the two airbags are arranged oppositely on two axial sides of the wheel disc, and the airbags are arranged in a ring shape.

[0017] In some embodiments, at least two groups of radial magnetic bearing assemblies are further included, and the radial magnetic bearing assemblies include a magnetic bearing rotor and a magnetic bearing stator. The magnetic bearing rotor is arranged on the rotating shaft, and the magnetic bearing stator is arranged on the housing.

[0018] In some embodiments, a plurality of phase-change heat absorbing elements are further included, wherein the phase-change heat absorbing elements are arranged on the shell, and the phase-change heat absorbing elements are arranged in a one-to-one correspondence with the protective bearing, the magnetic bearing stator and the airbag.

[0019] In some embodiments, an air flotation component is also included, and the air flotation component includes an air supply component. A groove is provided at the bottom of the rotating shaft, and the shell has a protrusion adapted to the groove. An air flotation cavity is provided between the protrusion and the side wall of the groove. The air supply component is connected to the air flotation cavity, and the air supply component is used to provide gas to the air flotation cavity to lift the rotating shaft.

[0020] In some embodiments, a shock absorbing assembly is also included, which includes a base, a top plate, and hydraulic supports and air supports located between the base and the top plate. The shell is arranged on the top plate, the base is placed on the work surface, and the hydraulic supports and the air supports are arranged alternately.

[0021] In some embodiments, an ultrasonic monitor is also included. The ultrasonic monitor is arranged on the shell and is used to monitor the safety status of the connection between the rotating shaft and the wheel disc.

[0022] In some embodiments, it also includes:

[0023] A vibration monitor, the vibration monitor is arranged on the housing, and the vibration monitor is used to monitor the running state of the flywheel;

[0024] And / or, it also includes a rotation speed monitor, which is arranged on the housing and is used to monitor the rotation speed of the flywheel.

[0025] In addition, an embodiment of the present invention further provides a flywheel energy storage system, which includes a flywheel controller and the flywheel energy storage device provided in the above embodiment, wherein the flywheel controller is connected to the flywheel energy storage device, and the flywheel controller is used to control the charge and discharge of the flywheel energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a flywheel energy storage device provided in one embodiment of the present invention.

[0027] Figure 2 yes Figure 1 A partial enlarged view of point A in the flywheel energy storage device shown.

[0028] Figure 3 yes Figure 1 A partial enlarged view of point B in the flywheel energy storage device shown.

[0029] Figure 4 yes Figure 1A partial enlarged view of the flywheel energy storage device at C shown in the figure

[0030] Figure 5 It is a structural schematic diagram of a shock absorbing assembly in a flywheel energy storage device provided in one embodiment of the present invention.

[0031] Reference numerals: 100, flywheel energy storage device;

[0032] 10. Shell; 11. Protection cavity; 12. Protection bearing; 13. Accommodation cavity; 14. First shell; 15. Second shell; 16. Triangular protrusion; 17. Phase change heat absorption element; 18. Protrusion; 19. Placement groove;

[0033] 20, flywheel; 21, wheel disc; 22, rotating shaft; 221, groove;

[0034] 30. Liquid supply assembly; 31. Liquid storage tank; 32. Air intake valve; 33. Oil valve; 34. Liquid supply pipe;

[0035] 40. air cushion protection assembly; 41. air bag; 411. abutment surface; 42. axial magnetic member; 43. air valve; 44. air supply pipe;

[0036] 51. Motor rotor; 52. Motor stator;

[0037] 60. radial magnetic bearing assembly; 61. magnetic bearing rotor; 62. magnetic bearing stator;

[0038] 70. air flotation assembly; 71. air flotation chamber; 72. air flotation tube; 73. air flotation valve;

[0039] 80. shock absorbing assembly; 81. base; 82. top plate; 83. hydraulic support; 84. air support;

[0040] 91. Ultrasonic monitor; 92. Vibration monitor; 93. Speed ​​monitor. DETAILED DESCRIPTION

[0041] 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.

[0042] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the embodiment of the present invention provides a flywheel energy storage device 100, which includes a housing 10, a flywheel 20, a liquid supply assembly 30 and an air cushion protection assembly 40, wherein the housing 10 has two protection cavities 11, and a protection bearing 12 is arranged in the protection cavity 11; the flywheel 20 includes a wheel disc 21 and a rotating shaft 22 connected to each other, and the two protection cavities 11 are respectively located at the two ends of the rotating shaft 22, and the rotating shaft 22 is connected to the protection bearing 12; the liquid supply assembly 30 has a liquid storage tank 31, and the liquid storage tank 31 is connected to the protection cavity 11 The liquid storage tank 31 is used to provide protection liquid to the protection cavity 11; the air cushion protection component 40 includes an airbag 41 and an axial magnetic part 42. There are multiple airbags 41. The multiple airbags 41 are respectively arranged on both sides of the axial direction of the wheel disc 21. The axial magnetic parts 42 are arranged one by one with the airbags 41. The axial magnetic parts 42 are arranged in the airbags 41. The airbags 41 have an inflated state and a deflated state. In the inflated state, the airbags 41 abut against the wheel disc 21. In the deflated state, a gap is provided between the airbags 41 and the wheel disc 21.

[0043] Specifically, the flywheel energy storage device 100 is an electromechanical energy conversion device. A motor rotor 51 is provided on the rotating shaft 22 of the flywheel 20, and a motor stator 52 matching the motor rotor 51 is provided on the housing 10, so that the flywheel energy storage device 100 has an energy storage stage and an energy release stage. In the energy storage stage, external electric energy drives the motor to run through the power converter, and the motor drives the flywheel 20 to accelerate the rotation, converting the electric energy into the mechanical kinetic energy of the flywheel 20 and storing it. In the energy release stage, the high-speed rotating flywheel 20 drives the motor to generate electricity, and the power converter outputs the current and voltage suitable for the load, thereby converting the mechanical kinetic energy into electric energy for release.

[0044] A accommodating chamber 13 is provided on the shell 10, and two protective chambers 11 are respectively located at the two ends of the accommodating chamber 13. A dynamic sealing assembly is provided between the cavity body of the protective chamber 11 and the cavity body of the accommodating chamber 13. The flywheel 20 and the motor rotor 51 are rotatably arranged in the accommodating chamber 13, and the protective bearing 12 has a supporting and positioning function for the flywheel 20, thereby ensuring the safety and stability of the flywheel 20 under long-term and high-load operation.

[0045] Optionally, the dynamic sealing component can be configured as a packing seal, an oil seal, etc. to adapt to different working conditions.

[0046] The liquid storage tank 31 in the liquid supply assembly 30 is connected to the protection cavity 11, and the protection liquid in the liquid storage tank 31 can enter the protection cavity 11 to protect the rotating shaft 22 and the protection bearing 12 of the flywheel 20. In particular, when the flywheel 20 is unstable, since the protection bearing 12 is immersed in the protection liquid in the protection cavity 11, the rotating shaft 22 of the flywheel 20 can be damped, reducing the collision of the rotating shaft 22 with the protection bearing 12 and the housing 10. Of course, the liquid supply assembly 30 can only operate when the flywheel 20 is unstable, that is, when the flywheel 20 is unstable, the protection liquid in the oil storage tank is transported to the protection cavity 11 to protect the flywheel 20 and the protection bearing 12.

[0047] The multiple airbags 41 in the air cushion protection assembly 40 are respectively located on both sides of the axial direction of the wheel disc 21. When the flywheel 20 is in normal operation, the airbags 41 are in a deflated state, and there is no gas filled in the airbags 41. The axial magnetic parts 42 are wrapped by the airbags 41, and the airbags 41 do not generate additional force on the flywheel 20. When the flywheel 20 is unstable, the airbags 41 will be filled with gas, and the airbags 41 will swell quickly, which can support the wheel disc 21 of the flywheel 20 and generate damping on the wheel disc 21, so that the flywheel 20 reduces vibration and obtains additional support and protection; and it can also generate interaction force with the flywheel 20 through the axial magnetic parts 42 inside it, further increasing the damping effect, thereby effectively suppressing the vibration and instability trend of the flywheel 20.

[0048] In summary, the flywheel energy storage device 100 provided in the embodiment of the present invention realizes effective protection of efficient and stable operation of the flywheel 20 in the energy storage and release stages through the mutual cooperation of the liquid supply component 30 and the air cushion protection component 40. In particular, when the flywheel 20 becomes unstable, the rapid response and coordinated work of the liquid supply component 30 and the air cushion protection component 40 can significantly reduce the vibration and collision risks of the flywheel 20, thereby protecting the stability and safety of the entire device.

[0049] In this embodiment, the shell 10 can be adapted to the shapes of the flywheel 20, the motor rotor 51, etc. The shell 10 can be divided into a first shell 14 located outside the protective cavity 11 and a second shell 15 located outside the accommodating cavity 13. A triangular protrusion 16 may be provided between the first shell 14 and the second shell 15. The triangular protrusion 16 protrudes toward the rotating shaft 22 to separate the accommodating cavity 13 and the protective cavity 11.

[0050] like Figure 2 As shown, in some embodiments, the protection chamber 11 can be set as a vacuum chamber, and the liquid supply assembly 30 includes an air intake valve 32, an oil valve 33 and a liquid supply pipe 34, and the two ends of the liquid supply pipe 34 are correspondingly connected to the oil storage tank and the protection chamber 11, the oil valve 33 is arranged on the liquid supply pipe 34 to control the on-off of the liquid supply pipe 34, and the air intake valve 32 is arranged on the oil storage tank to control the air entering the oil storage tank.

[0051] Specifically, the protective chamber 11 is set as a vacuum chamber, which can reduce the interaction between the flywheel 20 and the external environment during high-speed rotation, thereby reducing energy loss and friction loss. At the same time, the vacuum environment can also effectively isolate oxygen and moisture in the air to prevent them from corroding and damaging the flywheel 20 and the protective bearing 12.

[0052] The oil tank is used to store a certain amount of protection liquid, which can respond quickly and provide necessary lubrication and damping effects when the flywheel 20 is unstable. The oil valve 33 is installed on the liquid supply pipe 34 to accurately control the on-off state of the liquid supply pipe 34. When the flywheel 20 runs smoothly, the oil valve 33 remains closed to prevent the protection liquid from leaking into the protection chamber 11 without reason; when the flywheel 20 shows signs of instability, the oil valve 33 will respond quickly to the control signal and open, providing a channel for the protection liquid to enter the protection chamber 11.

[0053] When the flywheel 20 is unstable, the air inlet valve 32 and the oil valve 33 can be controlled to open synchronously. At this time, since the protection chamber 11 is a vacuum chamber, there is a significant pressure difference between it and the oil storage tank. Therefore, the protection liquid in the oil storage tank will quickly enter the protection chamber 11 through the liquid supply pipe 34 under the action of the pressure difference. This rapid response liquid supply mechanism can not only effectively reduce the vibration and collision risks caused by the instability of the flywheel 20, but also provide the flywheel 20 with necessary lubrication and damping protection, thereby ensuring the stability and safety of the entire flywheel energy storage device 100.

[0054] Furthermore, the protective liquid can be set as a lubricating liquid, which can provide necessary lubrication effect for the rotating shaft 22 and the protective bearing 12 during the rotation of the flywheel 20, thereby effectively reducing the vibration and collision risks of the flywheel 20.

[0055] Furthermore, the liquid supply assembly 30 may also include a protection liquid booster pump, which can speed up the efficiency of the protection liquid entering the protection chamber 11. When the flywheel 20 shows signs of instability, not only will the air intake valve 32 and the oil valve 33 be opened synchronously, but the protection liquid booster pump will also be started. Under the action of the protection liquid booster pump, the protection liquid in the oil storage tank will be rapidly pressurized and enter the protection chamber 11 at a higher speed and pressure through the liquid supply pipe 34.

[0056] like Figure 3 As shown, in some embodiments, the air cushion protection component 40 also includes an air source, an air valve 43 and an air supply pipe 44. The two ends of the air supply pipe 44 are correspondingly connected to the airbag 41 and the air source. The air valve 43 is arranged on the air supply pipe 44, and the air valve 43 is used to control the on and off of the air supply pipe 44.

[0057] Specifically, the gas source is responsible for providing a stable and continuous gas supply to the airbag 41. It can be an inert gas source such as compressed air or nitrogen to ensure that the airbag 41 will not be polluted or disturbed by the external environment during the inflation process. When the flywheel 20 runs smoothly, the air valve 43 remains closed to prevent the gas from leaking into the airbag 41 for no reason; and when the flywheel 20 shows signs of instability, the air valve 43 will quickly respond to the control signal and open, allowing the gas to quickly enter the airbag 41 through the air supply pipe 44. This design not only improves the response speed of the air cushion protection component 40, but also ensures that it plays the greatest protective role at critical moments.

[0058] Furthermore, the air cushion protection assembly 40 also includes a gas booster pump, which can quickly pressurize the gas in the gas source in a short time and accelerate it to push it into the airbag 41. When the flywheel energy storage device 100 detects that the flywheel 20 is at risk of instability, the system will immediately start the gas booster pump. Under the powerful effect of the gas booster pump, the gas in the gas source will be quickly pressurized and enter the airbag 41 through the gas supply pipe 44 at a higher speed and pressure.

[0059] Furthermore, a placement groove 19 is also provided on the shell 10 , and the placement groove 19 is used to position and place the airbag 41 .

[0060] In some embodiments, the airbag 41 has a contact surface 411, which is used to contact the wheel disc 21, and the contact surface 411 is coated with grease. When the flywheel 20 is unstable for some reason, the contact surface 411 can respond quickly and contact the wheel disc 21. The grease not only has a lubricating effect, which can reduce the friction coefficient between the contact surface 411 and the wheel disc 21, reduce wear and heat generation, but also provide a certain damping effect, further improving the buffering capacity of the air cushion.

[0061] In this embodiment, two airbags 41 are provided, and the two airbags 41 are relatively arranged on both sides of the axial direction of the wheel disc 21. That is to say, the airbags 41 are arranged corresponding to each other in the axial direction of the wheel disc 21 to ensure that when the airbags 41 are inflated or deflated, the force applied to the wheel disc 21 can be kept in a balanced state, thereby effectively avoiding the deflection or vibration of the wheel disc 21 caused by uneven force.

[0062] Furthermore, the airbag 41 can be set to be annular, and the axis of the annular airbag 41 coincides with the rotation axis of the shaft, so that when the airbag is inflated, it can apply a basically consistent force to each part of the wheel 21, ensuring uniform support throughout the entire circumference of the wheel.

[0063] like Figure 1As shown, in some embodiments, the flywheel energy storage device 100 also includes at least two groups of radial magnetic bearing assemblies 60, the radial magnetic bearing assembly 60 includes a magnetic bearing rotor 61 and a magnetic bearing stator 62, the magnetic bearing rotor 61 is arranged on the rotating shaft 22, and the magnetic bearing stator 62 is arranged on the housing 10. Among them, the magnetic bearing rotor 61 and the magnetic bearing stator 62 achieve contactless support and positioning through the interaction of precisely controlled electromagnetic fields. This non-contact support method greatly reduces friction and wear, and improves the operating efficiency and life of the flywheel energy storage device 100.

[0064] In this embodiment, the radial magnetic bearing assembly 60 is set to two groups, and the two groups of radial magnetic bearing assemblies 60 are divided into a first group and a second group. The first group of radial magnetic bearing assemblies 60 is located above the wheel disc 21 and between the protective bearing 12 and the motor rotor 51; the second group of radial magnetic bearing assemblies 60 is located below the wheel disc 21 and between the protective bearing 12 and the wheel disc 21.

[0065] It should be noted that the radial magnetic bearing assembly 60 and the protective bearing 12 play similar roles in the flywheel energy storage device 100, but their working principles and mechanisms are completely different. The radial magnetic bearing assembly 60 uses the interaction of electromagnetic fields to achieve contactless support and positioning, while the protective bearing 12 provides support through traditional mechanical contact. The organic combination of the two together constitutes an indestructible protective barrier in the flywheel energy storage device 100, ensuring the stable operation of the flywheel 20 under extreme working conditions.

[0066] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, the flywheel energy storage device 100 further includes a plurality of phase change heat absorbing elements 17, which are disposed on the housing 10. The phase change heat absorbing elements 17 are disposed in one-to-one correspondence with the protective bearing 12, the magnetic bearing stator 62 and the airbag 41, and can absorb and disperse heat more efficiently, thereby ensuring the stability and reliability of the flywheel energy storage device 100 during long-term operation.

[0067] Specifically, the phase change heat absorption element 17 is a material that can absorb, store and release a large amount of heat under specific conditions. It changes from solid to liquid at a specific temperature, absorbs a large amount of heat, and thus helps control the high temperature generated when the flywheel 20 rotor loses stability and prevents overheating. When the flywheel energy storage device 100 is under high load and long-term operation, key components such as the protective bearing 12, the magnetic bearing stator 62 and the airbag 41 will generate a certain amount of heat. If this heat is not dissipated in time, it will have an adverse effect on the performance and life of the flywheel energy storage device 100. The phase change heat absorption element 17 can utilize its own unique phase change characteristics to undergo a phase change after absorbing this heat, thereby effectively storing and dissipating this heat, ensuring that the flywheel energy storage device 100 operates within a stable operating temperature range.

[0068] When the flywheel 20 is unstable, a large amount of heat will be generated at the protective bearing 12, the magnetic bearing stator 62 and the airbag 41. If the heat cannot be dissipated in time, it will have an adverse effect on the performance and life of the flywheel energy storage device 100. The phase change heat absorption element 17 can absorb the heat and undergo phase change by virtue of its unique phase change characteristics, thereby effectively storing and dissipating the heat, so that the flywheel energy storage device 100 can operate within a stable operating temperature range, avoiding performance degradation and shortened life due to overheating.

[0069] In addition, the application scope of the phase change heat absorption element 17 is not limited to the key components on the housing 10, but can also be extended to the motor stator 52. When the flywheel 20 is unstable, the motor rotor 51 needs to be braked quickly, and a large amount of heat will be generated at the motor stator 52, and high temperature will be generated instantly. The phase change heat absorption element 17 can also be used to cool the motor stator 52 and the motor rotor 51 to ensure the stability and reliability of the motor during emergency braking.

[0070] Optionally, the phase change material element 17 may be provided in a patch-shaped, block-shaped or ring-shaped structure to be attached to the housing.

[0071] like Figure 4 As shown, in some embodiments, the flywheel energy storage device 100 also includes an air flotation component 70, the air flotation component 70 includes an air supply component, a groove 221 is provided at the bottom of the rotating shaft 22, the shell 10 has a protrusion 18 adapted to the groove 221, an air flotation cavity 71 is provided between the protrusion 18 and the side wall of the groove 221, and the air supply component is connected to the air flotation cavity 71, and the air supply component is used to provide gas to the air flotation cavity 71 to lift the rotating shaft 22.

[0072] When the flywheel 20 becomes unstable, the gas supply component will provide an appropriate amount of gas to the air flotation cavity 71, and the gas will diffuse rapidly in the air flotation cavity 71 to form a stable air film. As the gas is continuously injected, the air film will gradually thicken until the shaft 22 is completely lifted, thus achieving contactless support between the shaft 22 and the housing 10. In this process, the gas not only plays a supporting role, but also effectively takes away the heat generated by the shaft 22 during the rotation process through its flow characteristics, further improving the thermal management capability of the flywheel energy storage device 100.

[0073] Furthermore, the air flotation chamber 71 can be connected to the protective chamber 11, making full use of the lubrication and cooling properties of the protective liquid. It can not only effectively reduce the risk of direct contact between the rotating shaft 22 and the shell 10 due to insufficient gas film thickness, but also can take away the heat generated by the air flotation component 70 and the rotating shaft 22 during high-speed rotation through the circulation of the protective liquid, thereby further improving the thermal management capability of the flywheel energy storage device 100.

[0074] Furthermore, the air flotation assembly 70 further includes an air flotation valve 73 and an air flotation tube 72. The air flotation tube 72 connects the air supply component and the air flotation cavity 71. The air flotation valve 73 is arranged on the air flotation tube 72 to control the on-off of the air flotation tube 72 and control the gas in the air supply component to enter the air flotation cavity 71. In this embodiment, the air supply component can be set to be consistent with the gas source to reduce costs.

[0075] like Figure 5 As shown, in some embodiments, the flywheel energy storage device 100 also includes a shock absorbing assembly 80, which includes a base 81, a top plate 82, and a hydraulic support 83 and an air support 84 located between the base 81 and the top plate 82, the shell 10 is arranged on the top plate 82, the base 81 is arranged on the working surface, and the hydraulic support 83 and the air support 84 are arranged alternately.

[0076] Among them, the base 81, as the cornerstone of the entire shock absorbing assembly 80, is firmly installed on the working surface to ensure that the entire flywheel energy storage device 100 can be stably placed and operated. The top plate 82 is located above the base 81. It is the direct support surface of the housing 10 of the flywheel energy storage device 100, which can effectively disperse and reduce the vibration and impact force generated by the rotation of the flywheel 20. The hydraulic support 83 has good rigidity and can flexibly adjust the support strength according to the actual operating state of the flywheel 20, thereby achieving precise control of the operating stability of the flywheel 20. The air support 84 can effectively suppress the vibration amplitude of the flywheel 20 by regulating the pressure changes inside the air support 84, further reducing the vibration level of the entire device. This double-layer shock absorbing design combining air and hydraulic pressure not only ensures the smooth operation of the flywheel energy storage device 100 during the efficient energy storage and release process, but also significantly improves its adaptability and reliability under complex working conditions.

[0077] Furthermore, the housing 10 can be fixed to the top plate 82 by means of bolts or other structures. The hydraulic supports 83 and the air supports 84 are alternately arranged in a ring shape, thereby achieving a more balanced and comprehensive support for the overall device.

[0078] Optionally, the hydraulic support 83 can be set as a hydraulic cylinder, and the pressure of the internal hydraulic oil can be adjusted to achieve precise control of the support stiffness of the flywheel energy storage device 100. This design not only ensures the stability of the flywheel 20 when rotating at high speed, but also can respond quickly when encountering impact or vibration, providing necessary buffering and support, thereby effectively extending the service life of the flywheel 20 and its related components.

[0079] The air support 84 can be configured as an air spring or other components. The air spring, as a light and flexible support element, has excellent damping adjustment capability and good shock absorption effect. By filling an appropriate amount of air into the air spring, the vibration and impact force generated by the operation of the flywheel 20 can be effectively absorbed and dispersed, further reducing the vibration level of the entire device.

[0080] like Figure 1 As shown, in some embodiments, the flywheel energy storage device 100 also includes an ultrasonic monitor 91, which is arranged on the housing 10, and the ultrasonic monitor 91 is used to monitor the safety state of the connection between the rotating shaft 22 and the wheel disc 21. It can be understood that the rotating shaft 22 and the wheel disc 21 are the core components in the flywheel energy storage device 100, and the safety state of their connection is directly related to the operation stability and safety of the entire device. Therefore, monitoring the connection between the rotating shaft 22 and the wheel disc 21 can effectively and timely find out whether there are abnormal conditions such as looseness, wear or cracks in the connection, and can grasp the safety state of the connection between the rotating shaft 22 and the wheel disc 21 in real time to avoid the occurrence of safety accidents. In the present embodiment, the ultrasonic monitor is arranged on the housing and is located at the connection between the rotating shaft and the wheel disc to ensure that the ultrasonic monitor can monitor the safety state of the connection between the rotating shaft 22 and the wheel disc 21 in real time.

[0081] In addition, the ultrasonic monitor 91 can also be electrically connected to any one or more of the above-mentioned liquid supply component 30, air cushion protection component 40, air flotation component 70 and shock absorbing component 80. When the ultrasonic monitor 91 detects a safety problem at the connection between the rotating shaft 22 and the wheel disc 21, the corresponding components can be started in time to further reduce the possibility of safety accidents after the flywheel 20 becomes unstable, thereby ensuring the safety of the entire device.

[0082] like Figure 1As shown, in some embodiments, the flywheel energy storage device 100 further includes a vibration monitor 92, which is disposed on the housing 10 and is used to monitor the operating state of the flywheel 20. In other words, the vibration monitor 92 can capture the weak vibrations generated when the flywheel 20 is running, and convert them into electrical signals for transmission and processing. By analyzing these vibration signals, key information such as the stability of the speed of the flywheel 20, the health of the bearings, whether there is an unbalanced state, and potential hidden dangers of failure can be revealed.

[0083] Furthermore, the vibration monitor 92 can be electrically connected to any one or more of the above-mentioned liquid supply component 30, air cushion protection component 40, air flotation component 70 and shock absorption component 80, so that when the vibration monitor 92 detects that the operating state of the flywheel 20 is abnormal, it can quickly trigger the corresponding response mechanism and automatically start the relevant safety protection components, thereby minimizing the risk of safety accidents caused by failure of the flywheel 20.

[0084] For example, when the vibration monitor 92 detects that the flywheel 20 has problems such as imbalance or bearing wear, it will immediately send an alarm signal to the central control system. After receiving the signal, the central control system will quickly judge and decide whether to start any one or more of the above-mentioned liquid supply component 30, air cushion protection component 40, air flotation component 70 and shock absorption component 80 to deal with the current crisis according to the preset safety strategy.

[0085] like Figure 1 As shown, in some embodiments, the flywheel energy storage device 100 further includes a speed monitor 93, which is disposed on the housing 10. The speed monitor 93 is used to monitor the speed of the flywheel 20, so that the operator can compare the speed of the flywheel 20 with a preset speed range to evaluate whether the operating state of the flywheel 20 is within a normal range. In one embodiment of the present invention, the speed monitor 93, the vibration monitor 92, and the ultrasonic monitor 91 can be used in conjunction with each other to monitor the operating state of the flywheel 20 together.

[0086] In addition, the speed monitor 93 not only exists as an independent monitoring tool, but is also electrically connected to any one or more of the liquid supply component 30, the air cushion protection component 40, the air flotation component 70 and the shock absorbing component 80, so that when the speed monitor 93 detects that the speed of the flywheel 20 is abnormal, it can quickly trigger the corresponding response mechanism and automatically start the relevant protection components, thereby ensuring the safe operation of the flywheel energy storage device 100.

[0087] For example, when the speed monitor 93 detects that the speed of the flywheel 20 suddenly drops or fluctuates abnormally, it may immediately send an alarm signal to the central control system. After receiving this signal, the central control system will quickly judge and decide whether it is necessary to start the liquid supply component 30 to increase the flow of coolant to prevent the flywheel 20 from being damaged due to overheating according to the preset safety strategy; or whether it is necessary to activate the air cushion protection component 40 or the air flotation component 70 to add additional support or lubrication to ensure the stability of the flywheel 20 at unstable speeds; or whether it is necessary to adjust the damping characteristics of the shock absorbing component 80 to better absorb and disperse the vibration and impact force generated by the flywheel 20 at abnormal speeds.

[0088] In addition, it should be noted that in the flywheel energy storage device 100 provided in one embodiment of the present invention, the liquid supply component 30, the air cushion protection component 40, the air flotation component 70, the shock absorbing component 80, the radial magnetic bearing component 60 and the phase change heat absorption element 17, these key components can work together as a complete system, and can also be selectively combined according to actual needs to adapt to different application scenarios and performance requirements.

[0089] In this embodiment, the above-mentioned liquid supply assembly 30, air cushion protection assembly 40, air flotation assembly 70, shock absorption assembly 80, radial magnetic bearing assembly 60 and phase change heat absorption element 17 are all put into use, aiming to maximize the safety and stability of the flywheel energy storage device 100. Among them, the liquid supply assembly 30 ensures that the flywheel 20 is fully cooled and lubricated during operation to prevent overheating and wear; the air cushion protection assembly 40 and the air flotation assembly 70 provide additional support and buffering, reducing the vibration and impact that may be generated by the flywheel 20 when rotating at high speed; the shock absorption assembly 80 further absorbs and disperses these vibrations and impact forces, protecting the safety of surrounding structures and equipment; the radial magnetic bearing assembly 60 supports the flywheel 20 in a non-contact manner, reducing mechanical friction and wear, and improving the rotation accuracy and stability of the flywheel 20; and the phase change heat absorption element 17 utilizes the phase change characteristics of the material to absorb and store the heat generated during the operation of the flywheel 20, further enhancing the thermal management effect.

[0090] The coordinated work of these components can form an all-round safety protection network, which not only effectively reduces the vibration and impact force that may be generated by the flywheel 20 after instability, but also significantly reduces the probability of safety accidents. This comprehensive safety strategy not only improves the performance and reliability of the flywheel energy storage device 100, but also provides strong protection for its application in various complex and harsh working conditions.

[0091] In addition, an embodiment of the present invention further provides a flywheel energy storage system, which includes a flywheel controller and the flywheel energy storage device 100 provided in the above embodiment, the flywheel controller is connected to the flywheel energy storage device 100, and the flywheel controller is used to control the flywheel energy storage device 100 to charge and discharge.

[0092] It should be noted that the flywheel energy storage system provided in the embodiment of the present application has the same implementation principle and technical effects as those of the aforementioned embodiment of the flywheel energy storage device 100. For the sake of brief description, for parts not mentioned in the embodiment of the flywheel energy storage system, reference may be made to the corresponding contents in the aforementioned embodiment of the flywheel energy storage device 100.

[0093] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0094] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the 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.

[0095] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0096] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" 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", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0097] In the present invention, the terms "one embodiment", "some embodiments", etc. 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 one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0098] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A flywheel energy storage device, characterized in that: include: A housing, wherein the housing has two protection cavities, and a protection bearing is arranged in each of the protection cavities; A flywheel, the flywheel comprising a wheel disc and a rotating shaft connected to each other, the two protection chambers are respectively located at two ends of the rotating shaft, and the rotating shaft is connected to the protection bearing; A liquid supply component, wherein the liquid supply component has a liquid storage tank, the liquid storage tank is connected to the protection cavity, and the liquid storage tank is used to provide protection liquid to the protection cavity; An air cushion protection component, the air cushion protection component includes an airbag and an axial magnetic component, a plurality of airbags are provided, and the plurality of airbags are respectively arranged on both axial sides of the wheel disc, the axial magnetic component is arranged one-to-one with the airbags, the axial magnetic component is arranged in the airbag, the airbag has an inflated state and a deflated state, in the inflated state, the airbag abuts against the wheel disc, and in the deflated state, a gap is provided between the airbag and the wheel disc.

2. The flywheel energy storage device according to claim 1, characterized in that: The protection chamber is set as a vacuum chamber, and the liquid supply assembly includes an air intake valve, an oil valve and a liquid supply pipe. The two ends of the liquid supply pipe are correspondingly connected to the liquid storage tank and the protection chamber. The oil valve is arranged on the liquid supply pipe to control the on-off of the liquid supply pipe, and the air intake valve is arranged on the liquid storage tank to control the air entering the liquid storage tank.

3. The flywheel energy storage device according to claim 1, characterized in that: The air cushion protection assembly also includes an air source, an air valve and an air supply pipe, the two ends of the air supply pipe are correspondingly connected to the air bag and the air source, the air valve is arranged on the air supply pipe, and the air valve is used to control the on and off of the air supply pipe; And / or, the airbag has a contact surface, the contact surface is used to contact the wheel disc, and the contact surface is coated with grease; And / or, two airbags are provided, the two airbags are arranged oppositely on two axial sides of the wheel disc, and the airbags are arranged in a ring shape.

4. The flywheel energy storage device according to claim 1, characterized in that: It also includes at least two groups of radial magnetic bearing assemblies, wherein the radial magnetic bearing assemblies include a magnetic bearing rotor and a magnetic bearing stator. The magnetic bearing rotor is arranged on the rotating shaft, and the magnetic bearing stator is arranged on the housing.

5. The flywheel energy storage device according to claim 4, characterized in that: It also includes a plurality of phase-change heat absorbing elements, which are arranged on the shell, and the phase-change heat absorbing elements are arranged in a one-to-one correspondence with the protective bearing, the magnetic bearing stator and the airbag.

6. The flywheel energy storage device according to claim 1, characterized in that: It also includes an air flotation component, which includes an air supply component. A groove is provided at the bottom of the rotating shaft, and the shell has a protrusion that matches the groove. An air flotation cavity is provided between the protrusion and the side wall of the groove. The air supply component is connected to the air flotation cavity, and the air supply component is used to provide gas to the air flotation cavity to lift the rotating shaft.

7. The flywheel energy storage device according to claim 1, characterized in that: It also includes a shock-absorbing assembly, which includes a base, a top plate, and a hydraulic support and an air support located between the base and the top plate. The shell is arranged on the top plate, the base is placed on the work surface, and the hydraulic support and the air support are arranged alternately.

8. The flywheel energy storage device according to claim 7, characterized in that: It also includes an ultrasonic monitor, which is arranged on the shell and is used to monitor the safety status of the connection between the rotating shaft and the wheel disc.

9. The flywheel energy storage device according to claim 1, characterized in that: Also includes: A vibration monitor, the vibration monitor is arranged on the housing, and the vibration monitor is used to monitor the running state of the flywheel; And / or, it also includes a rotation speed monitor, which is arranged on the housing and is used to monitor the rotation speed of the flywheel.

10. A flywheel energy storage system, characterized in that: The invention comprises a flywheel controller and a flywheel energy storage device according to any one of claims 1 to 9, wherein the flywheel controller is connected to the flywheel energy storage device, and the flywheel controller is used to control the charge and discharge of the flywheel energy storage device.

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