An electric motor and generator separated flywheel energy storage device and system

Abstract

This invention discloses a flywheel energy storage device and system with separate electric and generator operation, belonging to the field of flywheel energy storage technology. It includes a vacuum housing, with a flywheel shaft rotatably connected to the inner cavity of the vacuum housing via a magnetic levitation bearing. A flywheel rotor is located at the bottom of the flywheel shaft, a generator rotor is located in the middle of the flywheel shaft, a generator stator is located in the middle of the inner cavity of the vacuum housing and outside the generator rotor, and a motor rotor is located at the top of the flywheel shaft. A motor stator is also located at the top of the inner cavity of the vacuum housing and outside the motor rotor. This invention, through the rotatable connection of the first and second outer shells with an annular plate, combined with the rolling contact design of the steel balls in the buffer assembly, achieves the effect of rotating the outer shell to dissipate force during external impacts. Simultaneously, through the synergistic buffering structure of the third damping spring and the damper, it absorbs impact energy and dampens vibrations, preventing damage to internal precision components.

Description

Technical Field

[0001] This invention relates to the field of flywheel energy storage technology, specifically to a flywheel energy storage device and system that separates electric power generation from electric power generation. Background Technology

[0002] Magnetic levitation flywheel energy storage devices, as a type of equipment that realizes the mutual conversion and storage of electrical and kinetic energy, have advantages such as high safety and reliability, long cycle life, and rapid charging and discharging capabilities. They are the best solution for the recovery and utilization of regenerative braking energy in urban rail transit systems such as subways and light rail. Magnetic levitation flywheel energy storage is a purely physical energy storage method, which aligns with my country's development needs for building "low-carbon, energy-saving, environmentally friendly, and green rail transit."

[0003] Existing magnetic levitation flywheel energy storage devices use a flywheel motor / generator integrated structure with two operating modes. In charging mode, the flywheel motor operates as a motor, driving the flywheel to rotate at high speed, converting externally input electrical energy into kinetic energy stored in the flywheel. In discharging mode, the motor operates as a generator, utilizing the inertia of the high-speed rotation of the flywheel to drive the rotor to rotate, converting the kinetic energy stored in the flywheel into electrical energy for output. However, the integrated structure limits the flywheel motor to operating in only one mode, making it impossible to achieve the efficient operation of absorbing braking energy while generating electricity.

[0004] Although the existing patent CN215772808U discloses a separate magnetic levitation flywheel energy storage device that can solve the above problems, its shell is a fixed integrated design. When subjected to external impacts (such as gravel impacts in rail transit scenarios or bumps during equipment handling), it cannot effectively dissipate the force, which can easily lead to shell deformation or cracking, thereby damaging the delicate internal magnetic levitation bearings and motor components. Therefore, this invention proposes a flywheel energy storage device and system that separates electric power generation from mechanical power generation. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A flywheel energy storage device with electric generator separation includes a vacuum housing. A flywheel shaft is rotatably connected to the inner cavity of the vacuum housing via a magnetic levitation bearing. A flywheel rotor is located at the bottom end of the flywheel shaft, and a generator rotor is located in the middle of the flywheel shaft. A generator stator is located in the middle of the inner cavity of the vacuum housing, outside the generator rotor. A motor rotor is located at the top end of the flywheel shaft, and a motor stator is located in the top end of the inner cavity of the vacuum housing, outside the motor rotor. Both ends of the vacuum housing are detachably connected to annular plates via a first connecting assembly. A first outer shell is rotatably connected to the outer side of the upper annular plate via a bearing, and a second outer shell is rotatably connected to the outer side of the lower annular plate via a bearing. The first and second outer shells are detachably connected together via a second connecting assembly. Several buffer components are provided between the first and second outer shells and the vacuum housing.

[0006] As a preferred embodiment of the flywheel energy storage device with electric power generation separation according to the present invention, the first connecting component includes: The first storage slot is provided on the inner side of the annular plate. The first positioning groove is provided on both sides of the vacuum housing. The first groove is provided on the annular plate located on one side of the first storage groove; The first guide groove is provided on the annular plate located outside the first receiving groove.

[0007] As a preferred embodiment of the flywheel energy storage device with electric power generation separation described in this invention, the first connecting component further includes: A first positioning rod is slidably connected in a first storage slot, and one end of the first positioning rod is inserted into the first positioning slot. The first guide rod is fixedly installed on the other end of the first positioning rod, and the first guide rod is slidably connected in the first guide groove; The first drive plate is fixedly installed on the side of the first positioning rod and is slidably connected in the first slide groove.

[0008] As a preferred embodiment of the flywheel energy storage device with electric power generation separation described in this invention, the first connecting component further includes: The first damping spring is sleeved on the first guide rod, and the two ends of the first damping spring are fixedly connected to the first positioning rod and the first storage groove, respectively. A first rubber ring is disposed on the inner surface of a first guide groove, and a first positioning rod can be inserted into the first rubber ring.

[0009] In a preferred embodiment of the flywheel energy storage device with electric power generation separation described in this invention, the second connecting component includes: The second storage slot is provided on the inner side of the top of the second outer shell. The second positioning groove is provided on the outer side of the bottom end of the first outer shell. The second groove is provided on the second outer shell located on one side of the second storage groove; The second guide groove is provided on the second outer shell located outside the second storage groove.

[0010] As a preferred embodiment of the flywheel energy storage device with electric power generation separation described in this invention, the second connecting component further includes: The second positioning rod is slidably connected in the second storage groove, and one end of the second positioning rod is inserted into the second positioning groove; The second guide rod is fixedly installed on the other end of the second positioning rod, and the second guide rod is slidably connected in the second guide groove; The second drive plate is fixedly installed on the side of the second positioning rod and is slidably connected in the second slide groove.

[0011] As a preferred embodiment of the flywheel energy storage device with electric power generation separation described in this invention, the second connecting component further includes: The second damping spring is sleeved on the second guide rod, and its two ends are fixedly connected to the second positioning rod and the second storage groove, respectively. The second rubber ring is disposed on the inner surface of the second guide groove, and the second positioning rod can be inserted into the second rubber ring.

[0012] As a preferred embodiment of the flywheel energy storage device with electric power generation separation described in this invention, the buffer assembly includes: Connecting plates: Several connecting plates are fixedly installed on the outer side of the vacuum housing; Telescopic rods, several telescopic rods are fixedly installed on the outer side of the connecting plate; A pressure plate is fixedly installed at one end of several of the telescopic rods; The third damping spring is sleeved on the telescopic rod, and its two ends are fixedly connected to the connecting plate and the pressure plate, respectively. A damper is fixedly installed between the connecting plate and the pressure plate.

[0013] As a preferred embodiment of the flywheel energy storage device with electric power generation separation described in this invention, the buffer assembly further includes: Spherical grooves: Several spherical grooves are provided on the outer side of the pressure plate; A steel ball is movably connected in a spherical groove and is in contact with the inner surfaces of the first and second outer shells.

[0014] A flywheel energy storage system with separate electric power generation and storage includes the aforementioned flywheel energy storage device with separate electric power generation and storage, an energy conversion unit, an intelligent control unit, and a grid interface module. The energy conversion unit includes a rectifier and an inverter connected to the flywheel energy storage device with separate electric power generation and storage. The intelligent control unit includes a driver, an intelligent controller, and a position and temperature sensor to realize charging and discharging mode switching, speed control, and status monitoring. The grid interface module is used for the system to interact with the external power grid.

[0015] Compared with existing technologies: 1. Through the rotational connection between the first and second outer shells and the annular plate, combined with the rolling contact design of the steel balls in the buffer assembly, the outer shells can rotate to relieve force when subjected to external impacts. At the same time, through the synergistic buffering structure of the third damping spring and the damper, the impact energy can be absorbed and vibration can be attenuated, thus preventing damage to the internal precision components. 2. Through the cooperation of the first positioning rod and the first positioning groove in the first connecting assembly and the pre-tightening design of the first damping spring, the ring plate and the vacuum shell can be quickly disassembled and connected stably. At the same time, through the symmetrical design of the second connecting assembly, the first shell and the second shell can be easily spliced ​​and disassembled, which greatly simplifies maintenance operations and reduces maintenance costs. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 For the present invention Figure 1 Enlarged schematic diagram of the structure at point B; Figure 4 This is a front view schematic diagram of the buffer component of the present invention; Figure 5 This is a top view of the first and second outer shells of the present invention; Figure 6 This is a top view of the annular plate of the present invention; Figure 7 This is a schematic diagram of the structure of the first positioning rod, the first guide rod, and the first drive plate of the present invention.

[0017] In the diagram: Vacuum housing 10, flywheel shaft 11, flywheel rotor 12, generator rotor 13, generator stator 14, motor rotor 15, motor stator 16, annular plate 20, first outer shell 21, second outer shell 22, first storage groove 30, first positioning groove 31, first sliding groove 32, first guide groove 33, first positioning rod 34, first guide rod 35, first drive plate 36, first damping spring 37, first rubber ring 38, second storage groove 40, second positioning groove 41, second sliding groove 42, second guide groove 43, second positioning rod 44, second guide rod 45, second drive plate 46, second damping spring 47, second rubber ring 48, connecting plate 50, telescopic rod 51, pressure plate 52, third damping spring 53, damper 54, spherical groove 55, steel ball 56. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0019] This invention provides a flywheel energy storage device that separates electric power generation from electricity generation. Please refer to [link / reference]. Figures 1-7 The system includes a vacuum housing 10, which is a hollow cylindrical structure that maintains a high vacuum environment to reduce air resistance and energy loss during flywheel rotation. A flywheel shaft 11 is rotatably connected to the inner cavity of the vacuum housing 10 via a magnetic levitation bearing. The magnetic levitation bearing is powered and controlled by a driver in an intelligent control unit, generating a magnetic field to levitate the flywheel shaft 11, achieving contactless rotation and significantly reducing mechanical friction loss. A flywheel rotor 12, made of high-strength carbon fiber composite material, is fixed to the bottom end of the flywheel shaft 11 via a key connection and stores kinetic energy. An interference fit is provided in the middle of the flywheel shaft 11. The generator rotor 13 is bolted to the middle of the inner cavity of the vacuum housing 10 and is located outside the generator rotor 13. The generator stator 14 is electrically connected to the inverter in the energy conversion unit and converts the kinetic energy of the flywheel rotor 12 into electrical energy through electromagnetic induction. The top end of the flywheel shaft 11 is interference-fitted with the motor rotor 15. The top end of the inner cavity of the vacuum housing 10 is bolted to the motor stator 16 located outside the motor rotor 15 and is electrically connected to the rectifier in the energy conversion unit. It is powered by DC power rectified by the rectifier from the external power grid and drives the motor rotor 15 to rotate the flywheel shaft 11 to store energy.

[0020] Both ends of the vacuum housing 10 are detachably connected to annular plates 20 via first connecting components. The annular plates 20 are made of aluminum alloy and serve as a transition between the vacuum housing 10 and the outer shell. The outer side of the upper annular plate 20 is rotatably connected to the first outer shell 21 via a deep groove ball bearing, and the outer side of the lower annular plate 20 is rotatably connected to the second outer shell 22 via a deep groove ball bearing. The first outer shell 21 and the second outer shell 22 are spliced ​​together to form a complete protective outer shell, which is made of wear-resistant stainless steel and can rotate around the annular plate 20. The first outer shell 21 and the second outer shell 22 are detachably connected together via a second connecting component, which facilitates the disassembly and maintenance of the outer shell. Several buffer components are evenly distributed between the first outer shell 21 and the second outer shell 22 and the vacuum housing 10 to absorb external impact energy.

[0021] The first connecting assembly includes a first storage groove 30, a first positioning groove 31, a first sliding groove 32, a first guide groove 33, a first positioning rod 34, a first guide rod 35, a first drive plate 36, a first damping spring 37, and a first rubber ring 38. The inner side of the annular plate 20 is evenly provided with a plurality of first receiving grooves 30 along the circumferential direction for receiving the first positioning rod 34; the two ends of the vacuum housing 10 are provided with a plurality of first positioning grooves 31 along the circumferential direction to cooperate with the first positioning rod 34 for positioning; the annular plate 20 located on one side of the first receiving groove 30 is provided with a first sliding groove 32 axially to provide sliding space for the first driving plate 36; the annular plate 20 located outside the first receiving groove 30 is provided with a first guide groove 33 radially to guide and limit the first guide rod 35; the first positioning rod 34 is slidably connected in the first receiving groove 30, and one end of the first positioning rod 34 is inserted into the first positioning groove 31, and the annular plate 20 and the vacuum housing 10 are fixed by the rod and groove cooperation; the first guide rod 35 is fixedly installed on the other end of the first positioning rod 34 by welding, and the first... A guide rod 35 is slidably connected in the first guide groove 33 to ensure that the first positioning rod 34 slides smoothly in the radial direction; the first drive plate 36 is fixedly installed on the side of the first positioning rod 34 by screws, and the first drive plate 36 is slidably connected in the first slide groove 32. The operator can control the extension and retraction of the first positioning rod 34 by moving the first drive plate 36. The first damping spring 37 is sleeved on the first guide rod 35, and the two ends of the first damping spring 37 are welded and fixed to the first positioning rod 34 and the first receiving groove 30 respectively, and is always in a pre-compressed state to provide continuous positioning pre-tightening force for the first positioning rod 34; the first rubber ring 38 is provided on the inner surface of the first guide groove 33 by interference fit, and the first positioning rod 34 can be inserted into the first rubber ring 38. The friction between the first rubber ring 38 and the first positioning rod 34 is greater than the elastic force of the first damping spring 37.

[0022] First connecting component operation process (vacuum housing and annular plate connection / disassembly): First, align the inner side of the annular plate 20 with the end of the vacuum housing 10, ensuring that the first receiving groove 30 on the annular plate 20 corresponds one-to-one with the first positioning groove 31 on the vacuum housing 10. Then, move the first drive plate 36 outward along the first sliding groove 32, causing the first positioning rod 34 to slide within the first receiving groove 30. At this time, the first guide rod 35 slides synchronously along the first guide groove 33, and the first damping spring 37 is compressed. After the annular plate 20 is in contact with the end of the vacuum housing 10, slowly release the first drive plate 36. The first damping spring 37 returns to its original position and pushes the first positioning rod 34 into the first positioning groove 31, completing the fixation of the annular plate and the vacuum housing. During the above process, the first positioning rod 34 can be inserted into the first rubber ring 38 to prevent the first positioning rod 34 from automatically returning to its original position.

[0023] The second connecting assembly includes a second storage groove 40, a second positioning groove 41, a second sliding groove 42, a second guide groove 43, a second positioning rod 44, a second guide rod 45, a second drive plate 46, a second damping spring 47, and a second rubber ring 48. The second outer shell 22 has several second storage slots 40 evenly distributed along the circumferential direction on the inner top side for storing the second positioning rod 44; the first outer shell 21 has several second positioning slots 41 correspondingly distributed along the circumferential direction on the outer bottom side, which cooperate with the second positioning rod 44 to achieve splicing and fixing of the first outer shell 21 and the second outer shell 22; the second outer shell 22 located on one side of the second storage slot 40 has a second sliding groove 42 axially distributed to provide sliding space for the second drive plate 46; the second outer shell 22 located outside the second storage slot 40 has a second guide groove 43 radially distributed to guide and limit the second guide rod 45; the second positioning rod 44 is slidably connected in the second storage slot 40, and one end of the second positioning rod 44 is inserted into the second positioning groove 41, achieving splicing and fixing of the first outer shell 21 and the second outer shell 22 through the rod-groove cooperation; the second guide rod 45 is fixedly installed on the second positioning rod 44 by welding. At the other end, the second guide rod 45 is slidably connected in the second guide groove 43 to ensure that the second positioning rod 44 slides smoothly in the radial direction; the second drive plate 46 is fixedly installed on the side of the second positioning rod 44 by screws, and the second drive plate 46 is slidably connected in the second slide groove 42. The operator can control the extension and retraction of the second positioning rod 44 by moving the second drive plate 46 to realize the quick disassembly and assembly of the outer shell; the second damping spring 47 is sleeved on the second guide rod 45, and the two ends of the second damping spring 47 are welded and fixed to the second positioning rod 44 and the second storage groove 40 respectively, and is always in a pre-compressed state to provide continuous splicing pre-tightening force for the second positioning rod 44; the second rubber ring 48 is provided on the inner surface of the second guide groove 43 by interference fit, and the second positioning rod 44 can be inserted into the second rubber ring 48. The friction between the second rubber ring 48 and the second positioning rod 44 is greater than the elastic force of the second damping spring 47.

[0024] Second connecting component operation process (first shell and second shell splicing / disassembly): Align the bottom of the first outer shell 21 with the top of the second outer shell 22, aligning the second positioning groove 41 on the first outer shell 21 with the second storage groove 40 on the second outer shell 22; move the second drive plate 46 outward along the second sliding groove 42, causing the second positioning rod 44 to retract into the second storage groove 40, and the second guide rod 45 to slide along the second guide groove 43, compressing the second damping spring 47; after the splicing surfaces of the first outer shell 21 and the second outer shell 22 are in contact, release the second drive plate 46, and the second damping spring 47 returns to its original position, pushing the second positioning rod 44 into the second positioning groove 41 to achieve splicing and fixing of the outer shells; during the above process, the second positioning rod 44 can be inserted into the second rubber ring 48 to prevent the second positioning rod 44 from automatically returning to its original position.

[0025] The buffer assembly includes a connecting plate 50, telescopic rods 51, a pressure plate 52, a third damping spring 53, a damper 54, a spherical groove 55, and a steel ball 56. Several connecting plates 50 are welded and fixedly installed on the outer side of the vacuum housing 10, serving as the mounting base for the buffer assembly. Several telescopic rods 51 are bolted and fixedly installed on the outer side of the connecting plates 50. The telescopic rods 51 have a multi-stage sleeve structure and can extend and retract axially. A set of pressure plates 52 are bolted to one end of several telescopic rods 51. The pressure plates 52 have an arc-shaped structure and are adapted to the inner surface of the housing. The third damping spring 53 is sleeved on the telescopic rods 51, and both ends of the third damping spring 53 are welded and fixed to the connecting plate 50 and the pressure plate 52 respectively, for absorbing impact energy and achieving reset. The damper 54 is bolted... Fixedly installed between the connecting plate 50 and the pressure plate 52, the damper 54 is a hydraulic structure that works in conjunction with the third damping spring 53 to quickly dampen vibrations and avoid resonance. The outer side of the pressure plate 52 has several spherical grooves 55 evenly distributed along its arc-shaped surface to accommodate steel balls 56. The steel balls 56 are movably embedded in the spherical grooves 55, and part of the spherical surface of the steel balls 56 protrudes from the surface of the pressure plate 52 and rolls in contact with the inner surfaces of the first outer shell 21 and the second outer shell 22, converting the sliding friction between the outer shell and the pressure plate 52 into rolling friction, reducing the resistance when the outer shell rotates, and ensuring that the outer shell can smoothly rotate and dissipate force during impact.

[0026] The working process of the buffer assembly (impact energy absorption): The buffer assembly has no active operating parts; its operation is automatically triggered by external impacts. When the first outer shell 21 or the second outer shell 22 is subjected to external impacts such as gravel impacts or vibrations, the outer shell rotates along the bearing on the outer side of the annular plate 20. The inner surface of the outer shell makes rolling contact with the steel ball 56. The steel ball 56 rotates in the spherical groove 55, converting sliding friction into rolling friction, reducing the rotational resistance of the outer shell, and achieving force relief in the impact direction. At the same time, the impact force is transmitted to the pressure plate 52 through the steel ball 56. The pressure plate 52 pushes the telescopic rod 51 to retract, and the third damping spring 53 sleeved on the telescopic rod 51 is compressed to absorb the impact energy. The damper 54, which is set synchronously, quickly attenuates the vibration of the pressure plate 52 to avoid resonance. When the impact force disappears, the third damping spring 53 resets and pushes the pressure plate 52 and the outer shell back to the initial position. The steel ball 56 rotates synchronously with the outer shell as it resets, completing one buffer cycle.

[0027] A flywheel energy storage system with separate electric motor generation and power generation includes the aforementioned flywheel energy storage device, energy conversion unit, intelligent control unit, and grid interface module. The energy conversion unit includes a rectifier electrically connected to the stator 16 of the electric motor in the flywheel energy storage device, and an inverter electrically connected to the stator 14 of the generator. The rectifier converts AC power from the external grid into DC power to supply the motor, and the inverter rectifies the AC power generated by the generator into DC power and then inverts it into AC power with the same frequency and phase as the grid. The intelligent control unit includes a driver, an intelligent controller, and a position and temperature sensor. The intelligent controller is a PLC controller powered by an external DC power supply. The position and temperature sensor collects parameters such as the flywheel shaft position and the temperature of each component in real time. Based on these parameters, the driver controls the magnetic field strength of the magnetic levitation bearing and the operating status of the motor, enabling switching between charging and discharging modes, precise speed control, and fault warning. The grid interface module connects to the external grid via a circuit breaker to enable safe energy interaction between the system and the external grid, including absorbing and storing grid energy and feeding back energy to the grid.

[0028] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A flywheel energy storage device with electric generator separation, comprising a vacuum housing (10), a flywheel shaft (11) rotatably connected to the inner cavity of the vacuum housing (10) via a magnetic levitation bearing, a flywheel rotor (12) at the bottom end of the flywheel shaft (11), a generator rotor (13) at the middle of the flywheel shaft (11), a generator stator (14) located outside the generator rotor (13) at the middle of the inner cavity of the vacuum housing (10), a motor rotor (15) at the top end of the flywheel shaft (11), and a motor stator (16) located outside the motor rotor (15) at the top end of the inner cavity of the vacuum housing (10), characterized in that, Both ends of the vacuum housing (10) are detachably connected to the annular plate (20) via the first connecting assembly. The outer side of the upper annular plate (20) is rotatably connected to the first outer shell (21) via a bearing, and the outer side of the lower annular plate (20) is rotatably connected to the second outer shell (22) via a bearing. The first outer shell (21) and the second outer shell (22) are detachably connected together via the second connecting assembly. Several buffer assemblies are provided between the first outer shell (21) and the second outer shell (22) and the vacuum housing (10).

2. The flywheel energy storage device with electric power generation separation according to claim 1, characterized in that, The first connecting component includes: a plurality of first storage grooves (30) are provided on the inner side of the annular plate (20), a plurality of first positioning grooves (31) are provided on both sides of the vacuum housing (10), a first sliding groove (32) is provided on the annular plate (20) located on one side of the first storage groove (30), and a first guide groove (33) is provided on the annular plate (20) located on the outer side of the first storage groove (30).

3. The flywheel energy storage device with electric power generation separation according to claim 2, characterized in that, The first connecting assembly further includes: a first positioning rod (34) slidably connected in the first storage groove (30), and one end of the first positioning rod (34) is inserted into the first positioning groove (31); a first guide rod (35) is fixedly installed on the other end of the first positioning rod (34), and the first guide rod (35) is slidably connected in the first guide groove (33); a first drive plate (36) is fixedly installed on the side of the first positioning rod (34), and the first drive plate (36) is slidably connected in the first slide groove (32).

4. The flywheel energy storage device with electric power generation separation according to claim 3, characterized in that, The first connecting assembly further includes: a first damping spring (37) sleeved on the first guide rod (35), and the two ends of the first damping spring (37) are fixedly connected to the first positioning rod (34) and the first receiving groove (30) respectively; a first rubber ring (38) is provided on the inner surface of the first guide groove (33), and the first positioning rod (34) can be inserted into the first rubber ring (38).

5. The flywheel energy storage device with electric power generation separation according to claim 1, characterized in that, The second connecting component includes: a plurality of second storage slots (40) are provided on the inner side of the top of the second housing (22); a plurality of second positioning slots (41) are provided on the outer side of the bottom of the first housing (21); a second sliding groove (42) is provided on the second housing (22) located on one side of the second storage slot (40); and a second guide groove (43) is provided on the second housing (22) located outside the second storage slot (40).

6. The flywheel energy storage device with electric power generation separation according to claim 5, characterized in that, The second connecting assembly further includes: a second positioning rod (44) slidably connected in the second storage groove (40), and one end of the second positioning rod (44) is inserted into the second positioning groove (41); a second guide rod (45) is fixedly installed on the other end of the second positioning rod (44), and the second guide rod (45) is slidably connected in the second guide groove (43); and a second drive plate (46) is fixedly installed on the side of the second positioning rod (44), and the second drive plate (46) is slidably connected in the second slide groove (42).

7. A flywheel energy storage device with electric power generation separation according to claim 6, characterized in that, The second connecting assembly further includes: a second damping spring (47) sleeved on the second guide rod (45), and the two ends of the second damping spring (47) are fixedly connected to the second positioning rod (44) and the second receiving groove (40) respectively; a second rubber ring (48) is provided on the inner surface of the second guide groove (43), and the second positioning rod (44) can be inserted into the second rubber ring (48).

8. The flywheel energy storage device with electric power generation separation according to claim 1, characterized in that, The buffer assembly includes: several connecting plates (50) fixedly installed on the outside of the vacuum housing (10); several telescopic rods (51) fixedly installed on the outside of the connecting plates (50); a set of pressure plates (52) fixedly installed at one end of the several telescopic rods (51); a third damping spring (53) sleeved on the telescopic rods (51); and the two ends of the third damping spring (53) fixedly connected to the connecting plate (50) and the pressure plate (52) respectively; and a damper (54) fixedly installed between the connecting plate (50) and the pressure plate (52).

9. A flywheel energy storage device with electric generator separation according to claim 8, characterized in that, The buffer assembly further includes: a plurality of spherical grooves (55) are provided on the outer side of the pressure plate (52), and steel balls (56) are movably connected in the spherical grooves (55), and the steel balls (56) are in contact with the inner surfaces of the first outer shell (21) and the second outer shell (22).

10. A flywheel energy storage system with separate electric power generation and discharge, characterized in that, The system includes a flywheel energy storage device with separate electric power generation as described in any one of claims 1-9, an energy conversion unit, an intelligent control unit, and a grid interface module; the energy conversion unit includes a rectifier and an inverter connected to the flywheel energy storage device with separate electric power generation; the intelligent control unit includes a driver, an intelligent controller, and a position and temperature sensor to realize charging and discharging mode switching, speed control, and status monitoring; the grid interface module is used for power interaction between the system and the external power grid.

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