Magnetic levitation flywheel energy storage device

Abstract

The present application belongs to the technical field of magnetic levitation energy storage equipment, and in particular, relates to a magnetic levitation flywheel energy storage device, which includes: a housing; a flywheel rotor; a magnetic bearing and a stator and rotor of a motor; an upper protection assembly, including an upper protection bearing and an upper conical member, the inner surface of the upper conical member having a cylindrical surface and a conical surface; a lower protection assembly, including a lower protection bearing and a lower conical member, the inner surface of the lower conical member having a cylindrical surface and a conical surface; a driver, which is electrically connected to the power supply structure of the magnetic levitation flywheel energy storage device; when power is cut off or the flywheel rotor is out of control, the driver drives the upper conical member to move to a second position, and the conical surfaces at both ends of the core shaft are respectively in contact with the conical surfaces of the upper conical member and the lower conical member. In the case of power cut off or the flywheel rotor is out of control, the driver drives the upper conical member to move from the first position to the second position, and the conical surfaces of the upper conical member and the lower conical member are respectively in contact with the conical surfaces at both ends of the core shaft, so that the flywheel rotor is re-centered and no eccentric rotation occurs.

Description

Technical Field

[0001] The present application belongs to the technical field of magnetic levitation energy storage equipment, and in particular, relates to a magnetic levitation flywheel energy storage device. Background Art

[0002] The magnetic levitation flywheel energy storage system is a device that stores electrical energy as kinetic energy and generates electrical energy from the stored kinetic energy. The magnetic levitation flywheel energy storage system has a wide range of applications, and can be used in mobile platforms such as automobiles and aerospace fields, and can also be used in fixed platforms such as UPS power supplies, solar energy and wind power generation systems.

[0003] In the magnetic levitation energy storage system, there is a gap between the rotor and the protective bearing. During the operation of the magnetic levitation bearing, the rotor rotates at high speed in the gap. If the rotor can always rotate in the center, the magnetic bearing can minimize the loss and vibration. However, if there is a serious flywheel eccentricity or the power source is interrupted, the magnetic levitation bearing may not be able to maintain the suspension state and may suddenly fail. The flywheel rotor collides with the protective bearing, which is very likely to damage the system components. In order to minimize the damage to the system components caused by faults, rolling bearings need to be placed along the axis of the flywheel rotor as protective bearings. In this way, when the flywheel loses stability, the rotor rotates on the protective bearing to ensure that the important components of the system are not damaged.

[0004] When a magnetic bearing fails, the rotor will fall onto the protective bearing and generate gyroscopic torque and extremely high unevenly distributed rotational torque on it. These two torques will not only shorten the life of the protective bearing, but also generate additional stress on the rotor, causing damage and fracture of the rotor. Although traditional protective bearings can help in emergencies, they cannot prevent the generation of uneven rotational torque and gyroscopic torque. Traditional protective bearings cannot fix the rotor in the center position when the magnetic energy storage system is not working, and the rotor leans on the protective bearing at an angle. During long-distance transportation, shaking is very likely to occur, causing damage to the rotor and protective bearing. Summary of the invention

[0005] The purpose of the present application is to provide a magnetic levitation flywheel energy storage device, which aims to solve the technical problem in the prior art that when a flywheel malfunctions or fails, the unevenly distributed rotational torque generated will shorten the life of the protective bearing and cause damage and fracture of the rotor.

[0006] To achieve the above purpose, the technical solution adopted in this application is: a magnetic levitation flywheel energy storage device, comprising:

[0007] shell;

[0008] A flywheel rotor is housed in the housing and includes a core shaft and a flywheel mounted on the core shaft;

[0009] A magnetic bearing and a stator and a rotor of a motor, wherein the magnetic bearing is sleeved outside the core shaft, the stator of the motor is fixed to the housing, the rotor of the motor is fixed to the core shaft, and the upper and lower ends of the core shaft respectively have conical surfaces;

[0010] An upper protection assembly connected to the housing, comprising an upper protection bearing and an upper conical member connected to the inner ring of the upper protection bearing, wherein the upper conical member is sleeved on the upper end of the core shaft and has an inner surface with a connected cylindrical surface and a conical surface;

[0011] A lower protection assembly connected to the housing, comprising a lower protection bearing and a lower cone connected to the inner ring of the lower protection bearing, wherein the lower cone is sleeved on the lower end of the mandrel and has an inner surface with a connected cylindrical surface and a conical surface;

[0012] A driver connected to the housing and electrically connected to a power supply structure of the magnetic levitation flywheel energy storage device;

[0013] Wherein, the driver can drive the upper cone to move back and forth between a first position and a second position. When the magnetic levitation flywheel energy storage device works normally, the upper protection assembly is located at the first position, and the upper and lower ends of the core shaft are respectively inclined against the cylindrical surfaces of the upper cone and the lower cone; when the magnetic levitation flywheel energy storage device is powered off or the flywheel rotor is out of control, the driver drives the upper cone to move downward from the first position to the second position, and the conical surfaces at the two ends of the core shaft are respectively in contact with the conical surfaces of the upper cone and the lower cone.

[0014] Furthermore, a displacement sensor is provided in the housing and is communicatively connected to the driver. The displacement sensor is used to detect the axial and radial offset status of the core shaft and send the detection information to the driver. The driver drives the upper cone to move to the second position when the displacement sensor detects that the axial and / or radial offset of the core shaft exceeds a preset value.

[0015] Furthermore, the driver includes a yoke assembly and an elastic member, and the yoke assembly is electrically connected to the power supply structure of the magnetic levitation flywheel energy storage device; when power is turned on, the yoke assembly compresses the elastic member, and the upper conical member is located at the first position; when power is turned off or the flywheel rotor is out of control, the elastic member pushes the upper conical member to move the upper conical member from the first position to the second position.

[0016] Furthermore, the elastic member is a spring, a spring sheet, a flexible buffer layer or a piston.

[0017] Furthermore, the yoke assembly includes an upper magnetic pole plate and a lower magnetic pole plate, and a receiving cavity is formed between the upper magnetic pole plate and the lower magnetic pole plate, and a coil is provided in the receiving cavity; when power is turned on, the elastic member is compressed between the upper magnetic pole plate and the lower magnetic pole plate, and the upper conical member is located in the first position; when power is turned off or the flywheel rotor is out of control, the elastic member pushes the lower magnetic pole plate, and then pushes the upper conical member to move to the second position.

[0018] Furthermore, the upper protection component also includes an upper support and an axial displacement slider coaxially arranged with the core shaft, the axial displacement slider is sleeved on the outside of the upper protection bearing, the upper support is connected to the outer shell, and the upper support is formed with a groove for accommodating the upper protection bearing, the upper conical member and the axial displacement slider. When the elastic member pushes the lower magnetic pole plate, the lower magnetic pole plate pushes the axial displacement slider to move downward in the axial direction in the groove, thereby driving the upper protection bearing and the upper conical member to move downward.

[0019] Furthermore, the upper end of the core shaft is provided with an upper protective sleeve, the outer surface of the upper protective sleeve is formed with a cylindrical surface and a conical surface respectively matching the cylindrical surface and conical surface of the upper conical part, and the lower end of the core shaft is provided with a lower protective sleeve, the outer surface of the lower protective sleeve is formed with a cylindrical surface and a conical surface respectively matching the cylindrical surface and conical surface of the lower conical part; when the upper conical part moves to the second position, there is a gap between the cylindrical surface of the upper conical part and the cylindrical surface of the upper protective sleeve, and there is a gap between the cylindrical surface of the lower conical part and the cylindrical surface of the lower protective sleeve.

[0020] Furthermore, the outer surface of the upper conical part is interference fit with the inner ring of the upper protective bearing, and the bottom end of the inner surface of the upper conical part forms a conical surface that gradually widens downward. The upper protective sleeve is interference fit with the core shaft, and the bottom end of the outer surface of the upper protective sleeve forms a conical surface that gradually widens downward. The bottom end of the upper conical part has a boss extending outward, and the lower end surface of the inner ring of the upper protective bearing abuts against the upper end surface of the boss.

[0021] Furthermore, the inner surface of the lower protective sleeve is interference fit with the core shaft, the upper end of the lower protective sleeve extends outward to form a boss, the outer surface of the lower protective sleeve is formed with a cylindrical surface near the bottom end, and a conical surface is formed between the outer surface of the lower protective sleeve and the lower surface of the boss; the outer surface of the lower conical part is interference fit with the inner ring of the lower protective bearing, the inner surface of the lower conical part is formed with a cylindrical surface, the top end of the inner surface of the lower conical part forms a conical surface gradually widening upward, and a shoulder extending outward is formed at the top end of the lower conical part, the lower end surface of the shoulder abuts against the upper end surface of the inner ring of the lower protective bearing, and there is a gap between the shoulder and the boss of the lower protective sleeve.

[0022] Furthermore, the magnetic levitation flywheel energy storage device also includes an axial-diameter integrated magnetic bearing sleeved on the upper end of the core shaft, and a radial magnetic bearing sleeved on the lower end of the core shaft.

[0023] The beneficial effects of the present application are as follows: the magnetic levitation flywheel energy storage device of the present application is provided with an upper protection component, a lower protection component and a driver. When the power is on and the flywheel rotor is working normally, the flywheel rotor can rotate around the geometric center axis of the device all the time; in the event of a power outage or the flywheel rotor is out of control, the driver drives the upper conical member to move from the first position to the second position, and the conical surfaces of the upper conical member and the lower conical member are respectively in contact with the conical surfaces at both ends of the core shaft, thereby locking the core shaft, re-centering the flywheel rotor, and preventing eccentric rotation, thereby preventing uneven rotational torque and gyroscopic torque from being generated between the core shaft and the protective bearing of the flywheel rotor, reducing collision damage to components, and increasing the life of the protective bearings at the upper and lower ends; at the same time, the magnetic levitation flywheel energy storage device is suitable for long-distance transportation, and the flywheel rotor will not shake in the outer casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A schematic diagram of the three-dimensional structure of a magnetic levitation flywheel energy storage device provided in an embodiment of the present application;

[0026] Figure 2 for Figure 1 A longitudinal sectional view of the magnetic levitation flywheel energy storage device shown;

[0027] Figure 3 for Figure 1 A longitudinal sectional view of the magnetic levitation flywheel energy storage device shown removed from the housing;

[0028] Figure 4 for Figure 2 A longitudinal sectional view of a component mounted on the upper end of a core shaft in the magnetic levitation flywheel energy storage device shown;

[0029] Figure 5 for Figure 2 A longitudinal sectional view of a component mounted on the lower end of a core shaft in the magnetic levitation flywheel energy storage device shown;

[0030] Figure 6 for Figure 1 An exploded schematic diagram of a magnetic levitation flywheel energy storage device is shown;

[0031] Figure 7 for Figure 2An exploded schematic diagram of the drive in the magnetic levitation flywheel energy storage device is shown.

[0032] Among them, the reference numerals in the figure are:

[0033] 100-housing; 200-flywheel rotor; 310-shaft-diameter integrated magnetic bearing; 320-radial magnetic bearing; 400-motor; 410-stator; 420-rotor; 500-upper protection assembly; 600-lower protection assembly; 700-driver; 800-displacement sensor; 810-upper displacement sensor; 820-lower displacement sensor; 110-middle housing; 120-bearing seat; 130-base; 140-fixed seat; 210-core shaft; 220-flywheel; 230-upper protection cover ;231-conical surface;240-lower protective sleeve;250-upper end cover;241-conical surface;510-upper protective bearing;520-upper conical member;530-axial displacement slider;540-upper support;541-groove;610-lower protective bearing;620-lower conical member;630-lower end cover;710-upper magnetic pole plate;711-annular groove;720-lower magnetic pole plate;730-coil;740-elastic member;741-wave spring;750-gasket;760-magnetic pole plate seat. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0035] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 a limitation on the present application.

[0036] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In this application, 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 connection; it can be a mechanical connection or an electrical connection; 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. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] like Figures 1 to 3 As shown, the magnetic levitation flywheel energy storage device provided in the embodiment of the present application includes a housing 100, a flywheel rotor 200, a magnetic bearing 300, a stator 410 and a rotor 420 of a motor 400, an upper protection assembly 500, a lower protection assembly 600 and a driver 700. The flywheel rotor 200 includes a core shaft 210 and a flywheel 220 fixed on the core shaft 210; the magnetic bearing, the stator 410 and the rotor 420 of the motor 400, the flywheel 220, the core shaft 210, the upper protection assembly 500, the lower protection assembly 600 and the driver 700 are coaxially arranged. The magnetic bearing 300 is sleeved outside the core shaft 210, the stator 410 of the motor 400 is fixed to the housing 100, the rotor 420 of the motor 400 is fixed to the core shaft 210, and the upper and lower ends of the core shaft 210 respectively have conical surfaces, which can be formed integrally on the outer surface of the core shaft 210, or formed by a protective member sleeved on the core shaft 210. The upper protection component 500 includes an upper protection bearing 510 and an upper conical component 520 connected to the inner ring of the upper protection bearing 510, the upper conical component 520 is sleeved on the upper end of the core shaft 210, and the upper conical component 520 has a connected cylindrical surface and a conical surface; the lower protection component 600 is fixed to the outer shell 100, and the lower protection component 600 includes a lower protection bearing 610 and a lower conical component 620 connected to the inner ring of the lower protection bearing 610, the lower conical component 620 is sleeved on the lower end of the core shaft 210, and the lower conical component 620 has a connected cylindrical surface and a conical surface.

[0039] The driver 700 is connected to the housing 100, and is electrically connected to the power supply structure of the magnetic suspension flywheel energy storage device, and both share a common power supply system. The driver 700 can drive the upper cone 520 to reciprocate between the first position and the second position.

[0040] Combined with reference Figure 2 , Figure 4 and Figure 5When the power is turned on and the magnetic suspension flywheel energy storage device is working normally, the upper cone 520 is located in the first position, the upper cone 520 is located in the non-working position, the upper end of the core shaft 210 leans obliquely on the cylindrical surface of the upper cone 520, and the lower end of the core shaft 210 leans obliquely on the cylindrical surface of the lower cone 620, and the conical surfaces of the upper cone 520 and the lower cone 620 have a gap with the conical surface of the core shaft 210. When the magnetic suspension flywheel energy storage device is ready to suspend, the driver 700 is powered on to drive the upper cone 520 to move to the non-working position, the upper and lower protection components 600 are separated from the flywheel rotor 200, and the magnetic suspension flywheel energy storage device can be calibrated, suspended and increased in speed at the normal position.

[0041] When the power is off, the driver 700 drives the upper cone member 520 to move from the first position to the second position, and the upper cone member 520 is in the working position. At this time, the conical surface of the upper cone member 520 contacts the conical surface of the upper end of the core shaft 210, and the conical surface of the lower cone member 620 contacts the conical surface of the lower end of the core shaft 210. The core shaft 210 is stably maintained on the geometric rotation axis of the entire device, which is suitable for long-distance transportation of the magnetic levitation flywheel energy storage device, and the flywheel rotor 200 will not shake in the housing 100.

[0042] That is to say, when the flywheel rotor 200 of the magnetic levitation flywheel energy storage device is greatly offset, the magnetic bearing 300 is about to fail, and the system suddenly loses power, the upper cone 520, under the action of the driver 700, quickly moves to the second position, so that the core shaft 210 contacts the upper and lower cones 620, and the core shaft 210 can be re-centered and rotated on the geometric rotation axis of the entire device, and can rotate until it stops. The flywheel rotor 200 rotates on the geometric rotation axis of the entire device, which can prevent the core shaft 210 of the flywheel rotor 200 from repeatedly shaking and colliding in the upper and lower protective bearings 610, prevent the uneven rotation torque and gyroscopic torque acting on the protective bearings, reduce the collision damage of parts, and increase the life of the protective bearings.

[0043] The magnetic levitation flywheel energy storage device provided in this embodiment is provided with an upper protection component 500, a lower protection component 600 and a driver 700. When powered on and working normally, the flywheel rotor 200 can rotate around the geometric center axis of the device all the time. When the power is off or the flywheel rotor 200 is out of control, the driver 700 drives the upper cone 520 to move from the first position to the second position, and the conical surfaces of the upper cone 520 and the lower cone 620 are respectively in contact with the conical surfaces at both ends of the core shaft 210, thereby locking the core shaft 210, so that the flywheel rotor 200 is re-centered and no eccentric rotation occurs, thereby preventing uneven rotation torque and gyroscopic torque from being generated between the core shaft 210 of the flywheel rotor 200 and the protective bearing, reducing collision damage to components and improving the service life of the protective bearings at the upper and lower ends. At the same time, the magnetic levitation flywheel energy storage device can be suitable for long-distance transportation, and the flywheel rotor 200 will not shake in the housing 100.

[0044] like Figure 1 , Figure 2 and Figure 6 As shown, the housing 100 includes a coaxially arranged middle shell 110, a bearing seat 120 and a base 130. The middle shell 110 is hollow inside, annular as a whole and open at both ends. The flywheel 220 is arranged roughly corresponding to the central position of the middle shell 110. The bearing seat 120 is connected to the upper end of the middle shell 110, and the base 130 is connected to the lower end of the middle shell 110. The bottom surface of the base 130 is connected to a fixing seat 140 through a fastener. The base 130 is provided with a plurality of fan-shaped holes arranged in an annular direction. The top surface of the fixing seat 140 is provided with a matching fan-shaped block at the position corresponding to each fan-shaped hole, and the fan-shaped block is adapted to be inserted into the fan-shaped hole. The cross-sectional area of ​​the fixing seat 140 is larger than the cross-sectional area of ​​the base 130. The fixing seat 140 is provided with a mounting hole so that the magnetic suspension flywheel energy storage device can be installed on an external device through a connector.

[0045] In one embodiment, a displacement sensor 800 is provided in the housing 100 and is connected to the driver 700. The displacement sensor 800 is used to detect the axial and radial displacement of the core shaft 210 and send the detection information to the driver 700. When the displacement sensor 800 detects that the axial and / or radial displacement of the core shaft 210 exceeds a preset value, the driver 700 drives the upper cone 520 to move to the second position. In this way, when the flywheel rotor 200 of the magnetic levitation flywheel energy storage device is greatly offset, or the magnetic bearing is about to fail and the system suddenly loses power, the displacement sensor 800 will send the detection information to the driver 700. At this time, the driver 700 drives the upper cone 520 to move axially downward to the second position, and the upper protective bearing 510 moves with the upper cone 520. The conical surfaces at the upper and lower ends lock the core shaft 210, so that the core shaft 210 is re-centered and rotates on the geometric rotation axis of the entire device, thereby preventing the core shaft 210 from repeatedly hitting the protective bearings at both ends.

[0046] In one embodiment, if Figure 2 , Figure 3 As shown, there are two displacement sensors 800, including an upper displacement sensor 810 and a lower displacement sensor 820. The upper displacement sensor 810 is fixed to the bearing seat 120, and the lower displacement sensor 820 is fixed to the base 130. Through the simultaneous detection of the upper and lower displacement sensors, the offset of the core shaft 210 can be detected more accurately to improve the reliability of the equipment operation. One end of the stator 410 of the motor 400 is connected to the lower displacement sensor 820 through an adapter to achieve relative fixation with the housing 100. The rotor 420 of the motor 400 is fixed to the bottom surface of the flywheel 220. The rotor 420 includes an inner rotor core and an outer rotor core. The stator 410 is inserted between the inner rotor core and the outer rotor core, and a magnetic gap is formed between the stator 410 and the inner rotor core and the outer rotor core.

[0047] In one embodiment, the driver 700 includes a yoke assembly, which is electrically connected to the power supply structure of the magnetic levitation flywheel energy storage device. When the power is off, the elastic member 740 stretches and the elastic member 740 abuts against the upper protection assembly 500. At this time, the conical surface of the upper conical member 520 abuts against the conical surface of the upper end of the core shaft 210, and the conical surface of the lower conical member 620 abuts against the conical surface of the lower end of the core shaft 210. The flywheel rotor 200 is fixed relative to the housing 100, and the flywheel rotor 200 does not shake.

[0048] In one embodiment, if Figure 4 , Figure 7 As shown, the yoke assembly includes an upper magnetic pole plate 710 and a lower magnetic pole plate 720, and an accommodating cavity is formed between the upper magnetic pole plate 710 and the lower magnetic pole plate 720, and a coil 730 is arranged in the accommodating cavity. When the coil 730 is energized, the two magnetic pole plates attract each other, and the distance between the two is reduced, and the moving magnetic pole plate compresses the elastic member 740; when the coil 730 is de-energized, the two magnetic pole plates are reset to the original position, at which time the elastic member 740 is against the upper protection component 500, and the upper conical positioning of the upper protection component 500 moves, and its conical surface contacts the conical surface of the upper end of the core shaft 210.

[0049] In one embodiment, if Figure 4 , Figure 6 and Figure 7 As shown, the bottom surface of the upper magnetic pole plate 710 is recessed to form an annular groove 711, and the lower magnetic pole plate 720 and the annular groove 711 form an accommodating cavity adapted to accommodate the coil 730; the inner sides of the upper magnetic pole plate 710 and the lower magnetic pole plate 720 are respectively formed with annular positioning steps, and the elastic member 740 adopts a multi-layer wave spring 741 stacked together, and the outer diameter of the wave spring 741 is adapted to the inner diameter of the upper magnetic pole plate 710, and a gasket 750 is placed on the wave spring 741 located at the top, and the gasket 750 is against the positioning step on the inner side of the upper magnetic pole plate 710, and the multi-layer wave spring 741 is located between the upper magnetic pole plate 710 and the lower magnetic pole plate 720.

[0050] In one embodiment, the elastic member 740 is a spring, a spring sheet, a flexible buffer layer or a piston. It is understandable that the elastic member 740 can also be other power devices with fast response characteristics. In one embodiment, the elastic member 740 is a wave spring 741 wound in multiple turns. The wave spring 741 is an elastic element with several peaks and valleys on a thin metal ring. It is suitable for applications where the load and deformation are not large and are restricted by a small installation space; Figure 4 , Figure 7 As shown, the elastic member 740 may also be a plurality of layers of wave springs 741 stacked together, and the wave spring 741 at the top is provided with a gasket 750 adapted to the inner positioning step of the upper magnetic pole plate 710 .

[0051] In one embodiment, if Figure 2 , Figure 4 As shown, the upper protection assembly 500 further includes an upper support 540 and an axial displacement slider 530 coaxially arranged with the core shaft 210, and the axial displacement slider 530 is sleeved outside the upper protection bearing 510. The upper support 540 is connected to the housing 100, and specifically, the upper support 540 is connected and fixed to the bearing seat 120 of the housing 100; a groove 541 for accommodating the upper protection bearing 510, the upper cone 520 and the axial displacement slider 530 is formed in the upper support 540. When the elastic member 740 pushes the lower magnetic pole plate 720, the lower magnetic pole plate 720 pushes the axial displacement slider 530 to move downward in the groove 541 along the axial direction, thereby driving the upper protection bearing 510 and the upper cone 520 to move downward.

[0052] like Figure 1 , Figure 3 and Figure 4 As shown, the driver 700 also includes a pole plate seat 760 , the periphery of the lower end of the pole plate seat 760 is connected and fixed to the upper support 540 , and the bottom surface of the pole plate seat 760 is provided with a receiving groove for accommodating the upper pole plate 710 and the lower pole plate 720 .

[0053] In one embodiment, if Figure 3 , Figure 4 As shown, the upper end of the core shaft 210 is sleeved with an upper protective sleeve 230, and the outer surface of the upper protective sleeve 230 is formed with a cylindrical surface and a conical surface that match the cylindrical surface and conical surface of the upper cone 520 respectively, and there is a gap between the cylindrical surface of the upper cone 520 and the cylindrical surface of the upper protective sleeve 230. The top of the upper protective sleeve 230 may be provided with an upper end cover 250, and the upper end cover 250 closes the opening at the top of the upper protective sleeve 230, so as to cover the exposed surface of the top of the core shaft 210 to prevent the entry of external dust or foreign matter.

[0054] like Figure 3 , Figure 5 As shown, the lower end of the mandrel 210 is sleeved with a lower protective sleeve 240, and the outer surface of the lower protective sleeve 240 is formed with a cylindrical surface and a conical surface that match the cylindrical surface and conical surface of the lower cone 620 respectively, and there is a gap between the cylindrical surface of the lower cone 620 and the cylindrical surface of the lower protective sleeve 240. The lower protective assembly 600 may also include a lower end cover 630, the lower end cover 630 is provided with a through hole for the lower end of the mandrel 210 to pass through, and the lower end cover 630 is connected and fixed to the bottom surface of the base 130; the base 130 is provided with a through hole for the lower protective sleeve 240 to pass through, and the outer ring of the lower protective bearing 610 is interference fit with the through hole wall of the base 130.

[0055] Specifically, Figure 4As shown, the outer surface of the upper conical member 520 is interference fit with the inner ring of the upper protective bearing 510, and the bottom end of the outer surface of the upper protective sleeve 230 is formed with a tapered surface 231 that gradually widens downwards. The length of the cylindrical surface of the inner surface of the upper conical member 520 is less than the length of the cylindrical surface of the outer surface of the upper protective sleeve 230. The bottom end of the inner surface of the upper conical member 520 is formed with a tapered surface that gradually widens downwards, and the inclination angle of the tapered surface matches the tapered surface 231 at the bottom end of the outer surface of the upper protective sleeve 230; the bottom end of the upper conical member 520 has a convex shoulder extending outward, and the lower end surface of the inner ring of the upper protective bearing 510 abuts against the convex shoulder. The upper end surface is positioned with the help of the boss; the upper protective sleeve 230 and the core shaft 210 are interference fit, and a shoulder is formed on the upper end of the core shaft 210, and the lower end surface of the upper protective sleeve 230 abuts against the shoulder, and is positioned with the help of the shoulder; the axial displacement slider 530 is interference fit with the outer ring of the upper protective bearing 510, and the axial displacement slider 530 can drive the upper protective bearing 510 and the upper cone 520 to move up and down in the upper support 540. The top end of the axial displacement slider 530 has an inwardly extending shoulder, and the lower end surface of the shoulder abuts against the upper end surface of the outer ring of the upper protective bearing 510, and is positioned with the help of the shoulder.

[0056] like Figure 5 As shown, the inner surface of the lower protective sleeve 240 is interference fit with the core shaft 210, the upper end of the lower protective sleeve 240 extends outward to form a convex shoulder, the outer surface of the lower protective sleeve 240 is formed with a cylindrical surface near the bottom end, and a conical surface 241 is formed between the outer surface of the lower protective sleeve 240 and the lower surface of the convex shoulder; the outer surface of the lower conical member 620 is interference fit with the inner ring of the lower protective bearing 610, and the inner surface of the lower conical member 620 is formed with a cylindrical surface, the length of which is less than the lower protective sleeve 240. The length of the cylindrical surface of the outer wall, the top end of the inner surface of the lower conical part 620 forms a conical surface that gradually widens upward, the inclination angle of the conical surface matches the inclination angle of the conical surface 241 of the lower protective sleeve 240, and a shoulder extending outward is formed at the top end of the lower conical part 620, the lower end face of the shoulder abuts against the upper end face of the inner ring of the lower protective bearing 610, there is a gap between the shoulder and the boss of the lower protective sleeve 240, and the lower end face of the outer ring of the lower protective bearing 610 abuts against the top face of the lower end cover 630.

[0057] In one embodiment, both the upper protection bearing 510 and the lower protection bearing 610 can be angular contact ball bearings, deep groove ball bearings or cylindrical roller bearings. Figure 3 As shown, the upper protective bearing 510 adopts an angular contact ball bearing, and the lower protective bearing 610 adopts a deep groove ball bearing.

[0058] In one embodiment, if Figure 2 , Figure 3As shown, the magnetic bearing 300 includes an axial-diameter integrated magnetic bearing 310 and a radial magnetic bearing 320 which are sleeved outside the core shaft 210. The axial-diameter integrated magnetic bearing 310 is close to the upper end of the core shaft 210, and the outer ring of the axial-diameter integrated magnetic bearing 310 is fixed to the bearing seat 120. The radial magnetic bearing 320 is close to the lower end of the core shaft 210. The setting of the two magnetic bearings can make the core shaft 210 in a suspended state when working.

[0059] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A magnetic levitation flywheel energy storage device, characterized in that: include: shell; A flywheel rotor comprises a core shaft and a flywheel mounted on the core shaft; A magnetic bearing and a stator and a rotor of a motor, wherein the magnetic bearing is sleeved outside the core shaft, the stator of the motor is fixed to the housing, the rotor of the motor is fixed to the core shaft, and the upper and lower ends of the core shaft respectively have conical surfaces; An upper protection assembly connected to the housing, comprising an upper protection bearing and an upper conical member connected to the inner ring of the upper protection bearing, wherein the upper conical member is sleeved on the upper end of the core shaft and has an inner surface with a connected cylindrical surface and a conical surface; A lower protection assembly connected to the housing, comprising a lower protection bearing and a lower cone connected to the inner ring of the lower protection bearing, wherein the lower cone is sleeved on the lower end of the mandrel and has an inner surface with a connected cylindrical surface and a conical surface; A driver connected to the housing and electrically connected to a power supply structure of the magnetic levitation flywheel energy storage device; Wherein, the driver can drive the upper cone to move back and forth between a first position and a second position. When the magnetic levitation flywheel energy storage device works normally, the upper protection assembly is located at the first position, and the upper and lower ends of the core shaft are respectively inclined against the cylindrical surfaces of the upper cone and the lower cone; when the magnetic levitation flywheel energy storage device is powered off or the flywheel rotor is out of control, the driver drives the upper cone to move downward from the first position to the second position, and the conical surfaces at the two ends of the core shaft are respectively in contact with the conical surfaces of the upper cone and the lower cone; the magnetic bearing, the stator and rotor of the motor, the flywheel, the core shaft, the upper protection assembly, the lower protection assembly and the driver are coaxially arranged.

2. The magnetic levitation flywheel energy storage device according to claim 1, characterized in that: A displacement sensor is provided in the housing and is communicatively connected to the driver. The displacement sensor is used to detect the axial and radial offset states of the core shaft and send the detection information to the driver. The driver drives the upper cone to move to the second position when the displacement sensor detects that the axial and / or radial offset of the core shaft exceeds a preset value.

3. The magnetic levitation flywheel energy storage device according to claim 1, characterized in that: The driver includes a yoke assembly and an elastic member, wherein the yoke assembly is electrically connected to the power supply structure of the magnetic levitation flywheel energy storage device; when power is on, the yoke assembly compresses the elastic member, and the upper conical member is located at the first position; when power is off or the flywheel rotor is out of control, the elastic member pushes the upper conical member, causing the upper conical member to move from the first position to the second position.

4. The magnetic levitation flywheel energy storage device according to claim 3 is characterized in that: The elastic member is a spring, a spring sheet, a flexible buffer layer or a piston.

5. The magnetic levitation flywheel energy storage device according to claim 3, characterized in that: The yoke assembly includes an upper magnetic pole plate and a lower magnetic pole plate, wherein a receiving cavity is formed between the upper magnetic pole plate and the lower magnetic pole plate, and a coil is arranged in the receiving cavity; when power is turned on, the elastic member is compressed between the upper magnetic pole plate and the lower magnetic pole plate, and the upper conical member is located at the first position; when power is turned off or the flywheel rotor is out of control, the elastic member pushes the lower magnetic pole plate, and then pushes the upper conical member to move to the second position.

6. The magnetic levitation flywheel energy storage device according to claim 5, characterized in that: The upper protection component also includes an upper support and an axial displacement slider coaxially arranged with the core shaft. The axial displacement slider is sleeved outside the upper protection bearing. The upper support is connected to the outer shell. The upper support is formed with a groove for accommodating the upper protection bearing, the upper cone and the axial displacement slider. When the elastic member pushes the lower magnetic pole plate, the lower magnetic pole plate pushes the axial displacement slider to move downward in the axial direction in the groove, thereby driving the upper protection bearing and the upper cone to move downward.

7. The magnetic levitation flywheel energy storage device according to any one of claims 1 to 6, characterized in that: The upper end of the core shaft is sleeved with an upper protective sleeve, and the outer surface of the upper protective sleeve is formed with a cylindrical surface and a conical surface respectively matching the cylindrical surface and conical surface of the upper cone part; the lower end of the core shaft is sleeved with a lower protective sleeve, and the outer surface of the lower protective sleeve is formed with a cylindrical surface and a conical surface respectively matching the cylindrical surface and conical surface of the lower cone part; when the upper cone part moves to the second position, there is a gap between the cylindrical surface of the upper cone part and the cylindrical surface of the upper protective sleeve, and there is a gap between the cylindrical surface of the lower cone part and the cylindrical surface of the lower protective sleeve.

8. The magnetic levitation flywheel energy storage device according to claim 7, characterized in that: The outer surface of the upper conical part is interference fit with the inner ring of the upper protective bearing, and the bottom end of the inner surface of the upper conical part forms a conical surface that gradually widens downward. The upper protective sleeve is interference fit with the core shaft, and the bottom end of the outer surface of the upper protective sleeve forms a conical surface that gradually widens downward. The bottom end of the upper conical part has a boss extending outward, and the lower end surface of the inner ring of the upper protective bearing abuts against the upper end surface of the boss.

9. The magnetic levitation flywheel energy storage device according to claim 7, characterized in that: The inner surface of the lower protective sleeve is interference fit with the core shaft, and the upper end of the lower protective sleeve extends outward to form a convex shoulder, and the outer surface of the lower protective sleeve is formed with a cylindrical surface near the bottom end, and a conical surface is formed between the outer surface of the lower protective sleeve and the lower surface of the convex shoulder; the outer surface of the lower conical part is interference fit with the inner ring of the lower protective bearing, and the inner surface of the lower conical part is formed with a cylindrical surface, and the top end of the inner surface of the lower conical part forms a conical surface gradually widening upward, and a shoulder extending outward is formed on the top end of the lower conical part, and the lower end surface of the shoulder abuts against the upper end surface of the inner ring of the lower protective bearing, and there is a gap between the shoulder and the convex shoulder of the lower protective sleeve.

10. The magnetic levitation flywheel energy storage device according to any one of claims 1 to 6, characterized in that: The magnetic suspension flywheel energy storage device also includes an axle-diameter integrated magnetic bearing sleeved on the upper end of the core shaft, and a radial magnetic bearing sleeved on the lower end of the core shaft.

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