CN115199705A - Multifunctional energy storage flywheel system with damped energy recovery and online modal monitoring - Google Patents

Abstract

The invention relates to a multifunctional energy storage flywheel system with damping energy recovery and online modal monitoring, which comprises: the top of the shell is provided with a bearing end cover, and the bottom in the shell is provided with a base; the mandrel penetrates into the shell, the flywheel is arranged in the middle of the mandrel, the top of the mandrel is movably connected with the bearing end cover, and the bottom of the mandrel penetrates through the base and extends to the outside of the bottom of the shell to form an extending part; the upper auxiliary bearing is arranged at the top of the mandrel and used for supporting the rotation of the flywheel; the permanent magnet bearing is positioned below the upper auxiliary bearing and arranged between the upper end surface of the mandrel and the shell; the repulsion Halbach circular ring array magnetic suspension device is arranged between the base and the mandrel, provides axial force for the flywheel and is matched with the permanent magnet bearing to enable the flywheel to complete suspension; the lower auxiliary bearing is arranged between the bottom of the shell and the mandrel and used for supporting the rotation of the flywheel. The invention can be applied to the field of energy storage flywheels.

Description

Multifunctional energy storage flywheel system with damped energy recovery and online modal monitoring

technical field

The invention relates to the technical field of an energy storage flywheel, in particular to a multifunctional energy storage flywheel system with damping energy recovery and online mode monitoring.

Background technique

The flywheel energy storage system is an energy storage device for electromechanical energy conversion, which breaks through the limitations of chemical batteries and realizes energy storage by physical methods. Through the motor/generator reciprocal bidirectional motor, the mutual conversion and storage between electrical energy and the mechanical kinetic energy of the high-speed flywheel has the advantages of high energy storage density, high power, high efficiency, long life, and no pollution. It can be widely used in Aerospace, power grid frequency modulation, uninterruptible power supply, locomotive traction, military (high-power electromagnetic gun, torpedo) and many other aspects.

The flywheel energy storage system is mainly composed of rotor system, bearing system and motor/generator, power converter and auxiliary operation system (including cooling system, vacuum system and state detection system). In order to store enough energy, the flywheel rotor is generally designed as a large inertia revolving body structure. Since the geometric center of the flywheel and the center of mass cannot be completely coincident, when the flywheel rotates at a high speed, vibration will inevitably occur, and the severe vibration and impact force will Direct damage to the bearing can lead to system damage in severe cases. In addition to the bearing system, an effective damping system is also required to damp vibration and control stability.

Due to the large mass and moment of inertia of the energy storage flywheel, the high rotational speed, the obvious gyroscopic effect, and the overcritical problem, traditional rolling bearings and hydrodynamic bearings are difficult to meet the requirements of high speed and heavy load and low friction loss. Generally, the magnetic suspension bearing is used to unload most of the weight of the flywheel, and then it is used with the mechanical protection bearing. Magnetic suspension bearings are mainly divided into two categories, active magnetic bearings and passive magnetic bearings. Active magnetic bearings mainly refer to electromagnetic bearings, and passive magnetic bearings mainly refer to permanent magnet bearings. Electromagnetic bearing uses controlled electromagnetic force to realize non-contact support of stator and rotor. It has the advantages of high speed, no wear, no need for lubrication system, low power consumption, and built-in online vibration monitoring function. It is suitable for high-speed rotor systems. However, for the flywheel system with high inertia and low speed, the advantages of electromagnetic bearings are difficult to exert, and the cost is high. The gyroscopic effect of low-speed and high-inertia flywheels is significant, the control of electromagnetic bearings is difficult, and it is easy to cause dynamic instability of the shaft system, which will directly damage the mechanical protection. Bearings and even the whole machine.

In order to reduce the windage loss as much as possible, the flywheel rotor operates in a vacuum environment, and uses a high-efficiency permanent magnet synchronous motor and converter to realize the rapid conversion of flywheel mechanical energy and electrical energy. The flywheel system realizes the charge-discharge cycle through frequent acceleration and deceleration. Therefore, it is also very important for the smooth operation of the flywheel to frequently cross the critical speed and accurately and timely grasp the modal characteristics of the flywheel rotor system.

SUMMARY OF THE INVENTION

Aiming at the bearing problems of the flywheel energy storage system during operation, the online monitoring of flywheel modal characteristics, as well as the problems of flywheel vibration control and energy recovery, the purpose of the present invention is to provide a multi-functional system with damping energy recovery and online modal monitoring. The energy storage flywheel system can support the movement of the rotor, reduce frictional resistance, reduce loss, damping the vibration of the flywheel, recover this part of the vibration energy, and obtain the modal characteristics of the flywheel shaft system in time.

In order to achieve the above purpose, the present invention adopts the following technical scheme: a multifunctional energy storage flywheel system with damping energy recovery and online modal monitoring, which comprises: a casing, the top of which is provided with a bearing end cover, which is located at the inner bottom of the casing A base is provided; a mandrel is passed through the casing, a flywheel is arranged in the middle of the mandrel, the top of the mandrel is movably connected with the bearing end cover, and the bottom of the mandrel passes through the base extending to the outside of the bottom of the casing to form an extension; an upper auxiliary bearing, arranged on the top of the mandrel, for supporting the rotation of the flywheel; a permanent magnet bearing, located below the upper auxiliary bearing, arranged in Between the upper end face of the mandrel and the shell, it is used to provide axial force for the flywheel; the repulsion type Halbach circular array magnetic levitation device is arranged between the base and the mandrel and is the flywheel An axial force is provided to complete the suspension of the flywheel in cooperation with the permanent magnet bearing; a lower auxiliary bearing is arranged between the bottom of the casing and the mandrel to support the rotation of the flywheel.

Further, the outer ring of the upper auxiliary bearing is arranged on the inner wall surface of the housing, the inner ring of the upper auxiliary bearing is fitted with the mandrel, and the upper auxiliary bearing is formed by the upper shoulder of the mandrel to locate.

Further, the permanent magnet bearing includes an upper permanent magnet, an axial displacement sensor probe and a lower permanent magnet;

The upper permanent magnet is inlaid on the inner wall surface of the casing, the lower permanent magnet is inlaid on the upper end surface of the mandrel, and the polarity of the upper permanent magnet is opposite to that of the lower permanent magnet, Each permanent magnet is arranged in an annular shape, and the annular ring is concentric with the mandrel;

The axial displacement sensor probe is arranged between the upper permanent magnet and the lower permanent magnet, and is used to measure the dynamic and static gaps of the permanent magnet bearing in real time to ensure that the gap is within a preset range.

Further, the repulsion type Halbach ring array magnetic suspension device includes a support sleeve, an upper Halbach ring array and a lower Halbach ring array;

The support sleeve is arranged on the lower shoulder of the mandrel, the upper Halbach ring array is arranged on the support sleeve, the lower Halbach ring array is arranged on the base, and the upper Halbach ring array is arranged on the base. The ring array and the lower Halbach ring array are formed by sequentially arranging and gluing a plurality of small torus to form a unilateral magnetic field;

In addition, the upper Halbach ring array and the lower Halbach ring array are symmetrically arranged, fit with clearance, and repel each other, so as to provide axial force to the flywheel.

Further, in the outer casing, a set of electromagnetic vibration exciters for monitoring the modal characteristics of the flywheel are respectively provided on the upper and lower parts of the flywheel, and the electromagnetic vibration exciters are installed in a non-contact manner with the mandrel;

The electromagnetic vibrator includes an E-type iron core, an excitation coil and a force measuring coil; the excitation coil and the force-measuring coil are wound in the upper groove and the lower groove of the E-type iron core respectively; the excitation coil The flywheel is excited to obtain its mode, and the force measuring coil is used to monitor the force output of the electromagnetic vibrator.

Further, a damping device is provided on the outer side of the bottom of the casing;

The damping device includes a damping device housing, and a cooling device, a damping body casing, an O-ring, a permanent magnet, a damping body, a bearing seat, a ball bearing and a squeeze oil film arranged in the damping device housing;

The damping device casing is arranged on the outer side of the bottom of the casing, the damping body casing is arranged in the damping device casing, and the cooling device is arranged between the damping device casing and the damping body casing;

The damping body is installed in a clearance fit with the damping body casing, and the O-ring is provided at the upper and lower parts of the clearance. The O-ring adopts a structure for centering the journal, and the O-ring forming a sealed environment with the damping body and the damping body shell to form the squeeze oil film;

A tile-shaped slot is opened on the outer circular surface of the damping body, and the tile-shaped permanent magnet is embedded in the tile-shaped slot;

The bearing seat is installed in cooperation with the inner circular surface of the damping body, and is located in the middle part of the damping device casing; the lower end of the extension part of the mandrel is circumferentially provided with the ball bearing, The bearing seat is fitted with the installation.

Further, the damping body shell adopts a hollow structure, and a coil is arranged in the hollow core, and the coil interacts with the permanent magnet to generate an induced voltage; The sealing groove of the O-ring is arranged, and an oil outlet hole and an oil inlet hole are respectively arranged on both sides of the damping body casing.

Further, the cooling device includes a casing, a water inlet, a water outlet and a spiral pipe; the casing is a cylindrical structure, and the top and bottom of the casing are respectively provided with the water inlet and the water outlet, and the spiral pipe It is arranged in the casing, and one end of the spiral tube is communicated with the water inlet, and the other end of the spiral tube is communicated with the water outlet.

Further, on the upper part of the casing, a motor/generator integrated machine is arranged on the mandrel below the permanent magnet bearing.

Further, an upper radial displacement sensor and a lower radial displacement sensor are respectively arranged at the upper auxiliary bearing and the lower auxiliary bearing; an axial displacement sensor is arranged at the lower part of the mandrel; through the axial displacement The sensor, the upper radial displacement sensor and the lower radial displacement sensor sense the vibration state of the flywheel.

The present invention has the following advantages due to taking the above technical solutions:

1. The flywheel rotor support system of the present invention adopts a variety of bearings, which are mixed together to make the flywheel suspend and reduce friction loss as much as possible.

2. The present invention is provided with an online monitoring device for the modal characteristics of the flywheel, which can obtain the modal characteristics of the flywheel shaft system in time.

3. The present invention is provided with a damping device, which can reduce the vibration of the flywheel.

4. The present invention is provided with an energy recovery device, which can recover and utilize part of the vibration energy of the flywheel.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the multifunctional energy storage flywheel system in the embodiment of the present invention;

2 is a schematic structural diagram of an electromagnetic vibrator in an embodiment of the present invention;

3 is a top view of an electromagnetic excitation device in an embodiment of the present invention;

Fig. 4 is the schematic diagram of the structure of the permanent magnet bearing in the embodiment of the present invention;

5 is a schematic structural diagram of a repulsion type Halbach ring array magnetic suspension device in an embodiment of the present invention;

Fig. 6 is the arrangement schematic diagram of the repulsive force type Halbach ring array in the radial direction section in the example of the present invention;

7 is a schematic structural diagram of a damping device in an embodiment of the present invention;

8 is a schematic structural diagram of a damping body in an embodiment of the present invention;

9 is a schematic structural diagram of a damping body shell in an embodiment of the present invention;

10 is a schematic diagram of a cooling device in an embodiment of the present invention;

FIG. 11 is a schematic diagram of a built-in helical tube of a cooling device in an embodiment of the present invention.

Reference number:

1-flywheel; 2-electromagnetic vibration exciter; 3-motor/generator; 4-upper radial displacement sensor; 5-permanent magnet bearing; 6-upper auxiliary bearing; 7-washer; 8-axial displacement sensor ;9-bearing end cover;10-bolt;11-housing;12-supporting sleeve;13-upper Halbach ring array;14-lower Halbach ring array;15-base;16-lower radial displacement sensor;17- Lower auxiliary bearing; 18-mandrel; 19-damping device; 21-E type iron core; 22-excitation coil; 23-force coil; 51-upper permanent magnet; 52-axial displacement sensor probe; 53-lower permanent magnet ;190-damping device housing;191-cooling device;192-damping body shell;193-coil;194-O-ring;195-permanent magnet;196-damping body;197-bearing seat;198-ball bearing;199 - Squeeze oil film; 1911 - water inlet; 1912 - water outlet; 1913 - spiral tube; 1921 - sealing groove; 1922 - oil outlet; 1923 - oil inlet.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of the present invention.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

The multifunctional energy storage flywheel system with damping energy recovery and on-line modal monitoring provided by the present invention is a new unloading structure of magnetic suspension bearing. New damping devices and functional devices with energy recovery are also designed. It can support the movement of the rotor, reduce the frictional resistance, reduce the loss, damping the vibration of the flywheel, recover this part of the vibration energy, and obtain the modal characteristics of the flywheel shaft system in time. Because the permanent magnet bearing is usually composed of a pair or more magnetic rings arranged radially or axially, it has the advantages of large unloading force, low energy consumption, no power supply and simple structure. The invention mixes the permanent magnet bearing and the mechanical bearing, can integrate the advantages of the two, and is suitable for a flywheel energy storage system with low cost and large inertia.

In one embodiment of the present invention, a multifunctional energy storage flywheel system with damping energy recovery and on-line modal monitoring is provided. In this embodiment, as shown in Figure 1, the system includes:

The casing 11 is provided with a bearing end cover 9 at the top, and a base 15 is located at the bottom of the casing 11;

The mandrel 18 is arranged in the casing 11, the flywheel 1 is arranged in the middle of the mandrel 18, the top of the mandrel 18 is movably connected with the bearing end cover 9, and the bottom of the mandrel 18 extends through the base 15 to the outside of the bottom of the casing 11, forming an extension;

The upper auxiliary bearing 6 is arranged on the top of the mandrel 18 to support the rotation of the flywheel 1;

The permanent magnet bearing 5, located below the upper auxiliary bearing 6, is arranged between the upper end face of the mandrel 18 and the casing 11, and is used to provide an axial force for the flywheel 1;

The repulsion type Halbach ring array magnetic levitation device is arranged between the base 15 and the mandrel 18, provides axial force for the flywheel 1, and cooperates with the permanent magnet bearing 5 to complete the suspension of the flywheel 1;

The lower auxiliary bearing 17 is arranged between the bottom 15 of the housing 11 and the core shaft 18 , and is used to support the rotation of the flywheel 1 .

In the above embodiment, the upper auxiliary bearing 6 is mounted on the top end of the mandrel 18 . The outer ring of the upper auxiliary bearing 6 is arranged on the inner wall surface of the housing 11 , the inner ring of the upper auxiliary bearing 6 is fitted with the mandrel 18 , and the upper auxiliary bearing 6 is positioned by the upper shoulder of the mandrel 18 .

Specifically, after the upper auxiliary bearing 6 is placed in a predetermined position, the gasket 7 is placed, and then the bearing end cover 9 is covered, and is connected with the housing 11 by bolts 10. This structure can make installation and maintenance more convenient. An upper auxiliary bearing 6 and a lower auxiliary bearing 17 are respectively installed on the upper and lower ends of the flywheel mandrel 18 to support the flywheel 1 to rotate. In this embodiment, both the upper auxiliary bearing 6 and the lower auxiliary bearing 17 use rolling bearings.

In the above-mentioned embodiment, a set of electromagnetic exciters 2 for monitoring the modal characteristics of the flywheel are respectively provided in the casing 11 at the upper and lower parts of the flywheel 1 .

As shown in FIG. 2, the electromagnetic exciter 2 includes an E-type iron core 21, an excitation coil 22 and a force-measuring coil 23; the excitation coil 22 and the force-measuring coil 23 are wound in the upper groove and the lower groove of the E-type iron core 21 respectively. The excitation coil 22 excites the flywheel 1 to obtain its mode, and the force measuring coil 23 is used to monitor the force output of the electromagnetic vibrator 2 .

In this embodiment, each group of electromagnetic vibration exciters 2 is formed by using four electromagnetic vibration exciters arranged at 90°, as shown in FIG. Modal properties.

Preferably, the upper end of the mandrel 18 is provided with four non-contact vibration exciters placed at an orthogonal angle of 90 degrees, which can excite the static or rotating flywheel 1 and monitor the shafting mode in real time.

When in use, the electromagnetic force can be generated by passing a current to the exciting coil 22, and the electromagnetic exciter 2 can directly use the electromagnetic force as the exciting force to excite the flywheel shaft system to obtain its mode, and can also use the electromagnetic force as the exciting force to excite the flywheel shaft. It is in a static state or in a state of different rotational speeds to obtain its modal changes and understand the working state of the shaft system; and the force measuring coil 23 is used to monitor the magnitude of the force output of the exciter 2. Through detection and adjustment, excitation can be avoided. Excessive vibration force will deform and move the measured object and affect the output of the exciter.

In the above embodiment, as shown in FIG. 4 , the permanent magnet bearing 5 includes an upper permanent magnet 51 , an axial displacement sensor probe 52 and a lower permanent magnet 53 . The upper permanent magnet 51 is embedded on the inner wall surface of the housing 11, the lower permanent magnet 53 is embedded on the upper end surface of the mandrel 18, and the polarity of the upper permanent magnet 51 is opposite to that of the lower permanent magnet 53. For example, the upper permanent magnet 51 The N pole of the upper permanent magnet 53 is opposite to the S pole of the lower permanent magnet 53, and the S pole of the upper permanent magnet 51 is opposite to the N pole of the lower permanent magnet 53. When in use, the flywheel 1 is provided with an axial force through the attraction of opposite poles, so that the flywheel 1 Suspended. Each permanent magnet is arranged in a circular ring, and the ring is concentric with the mandrel 18, which are multiple groups of concentric rings with different diameters, and the outer surfaces of the permanent magnets on the adjacent concentric rings have opposite polarities. It is made of tin-iron-boron rare earth permanent magnet material, and has an anti-oxidation layer on the surface to prevent the permanent magnet from being oxidized, and at the same time, it can also prevent the brittle permanent magnet from breaking and flying out.

The axial displacement sensor probe 52 is arranged between the upper permanent magnet 51 and the lower permanent magnet 53, and is used to measure the dynamic and static gaps of the permanent magnet bearing 5 in real time to ensure that the gap is within a preset range. If the gap is too large, the unloading force will be reduced, and the unloading effect will be poor; if the gap is too small, the unloading force will be too large, and collision is easy to occur, or after the wheel body is heated, it will expand, causing the gap to be too small and rubbing, which will damage the shaft system.

In the above embodiment, as shown in FIG. 5 , the repulsion type Halbach ring array magnetic suspension device includes a support sleeve 12 , an upper Halbach ring array 13 and a lower Halbach ring array 14 . The support sleeve 12 is arranged on the lower shoulder of the mandrel 18, the upper Halbach ring array 13 is arranged on the support sleeve 12, the lower Halbach ring array 14 is arranged on the base 15, the upper Halbach ring array 13 and the lower Halbach ring The arrays 14 are formed of a plurality of small circular bodies arranged and bonded in sequence to form a unilateral magnetic field. In addition, the upper Halbach ring array 13 and the lower Halbach ring array 14 are symmetrically arranged, fit with clearance and repel each other, and provide axial force to the flywheel 1 .

As shown in Figure 6, it is a schematic diagram of the arrangement of the repulsion type Halbach ring array along the radial direction. The direction of the arrow represents the magnetization direction. According to a certain arrangement rule, the radial arrangement is combined together, and the arranged permanent magnet structure will eventually form The unilateral magnetic field with large magnetic force, by setting up and down two sets of Halbach ring arrays, clearance fit and mutual repulsion, provides axial force to the flywheel to make it levitate; the axial force and The axial force provided by the permanent magnet bearing 5 together makes the flywheel rotor levitate.

In the above embodiment, the damping device 19 is provided on the outer side of the bottom of the casing 11 . When the flywheel 1 rotates at high speed due to the incomplete coincidence of the mass center and the geometric center, and vibration occurs, the vibration can be reduced by the damping device 19 provided at the bottom of the flywheel energy storage system. As shown in FIG. 7 , the damping device 19 includes a damping device housing 190 , and a cooling device 191 , a damping body housing 192 , an O-ring 194 , a permanent magnet 195 , a damping body 196 , and a bearing seat arranged in the damping device housing 190 197, ball bearing 198 and squeeze oil film 199.

The damping device housing 190 is arranged on the outer side of the bottom of the housing 11 , the damping device housing 190 is provided with a damping body housing 192 , and a cooling device 191 is arranged between the damping device housing 190 and the damping body housing 192 ;

The damping body 196 is installed in clearance fit with the damping body shell 192. The upper and lower parts of the clearance are provided with O-rings 194. The O-rings 194 adopt the structure of centering the journal, and the O-rings 194 and the damping body 196, The damping body casing 192 constitutes a sealed environment and forms a squeeze oil film 199; meanwhile, the O-ring 194 can also bear a large axial load.

A tile-shaped groove is formed on the outer circular surface of the damping body 196, and the tile-shaped permanent magnet 195 is embedded in the tile-shaped groove; using this surface embedded structure, a 4-pole rotor is formed. The structure has inverse saliency, and the related stamping involved in the surface embedded structure is not too complicated, so it has a simple structure, low cost, and is easier to manufacture than the embedded structure, as shown in Figure 8.

The bearing seat 197 is installed with the inner circular surface of the damping body 196 and is located in the middle of the damping device housing 190 ;

In the above-mentioned embodiment, as shown in FIG. 9 , the damping body casing 192 adopts a hollow structure, and a coil 193 is arranged in the hollow core. The coil 193 interacts with the permanent magnet 195 to generate an induced voltage; the upper part of the inner wall surface of the damping body casing 192 and The lower part is respectively provided with a sealing groove 1921 for accommodating the O-ring 194 , and an oil outlet hole 1922 and an oil inlet hole 1923 are respectively provided on both sides of the damper housing 192 . The oil pressure of the damping oil is controlled through the oil inlet hole 1923 and the oil outlet hole 1922 provided on the damper housing 192; at the same time, the flywheel is sensed by the axial displacement sensor 8, the upper radial displacement sensor 4, and the lower radial displacement sensor 16. According to the vibration state, the oil pressure of the squeeze oil film can be changed to adjust the shock absorption effect of the damping oil.

When in use, when the flywheel 1 is running, the vibration of the flywheel rotor will be transmitted to the ball bearing 198 through the mandrel 18, and then to the bearing seat 197, and then to the damping body 196, by squeezing the oil film 199, the O-ring 1904 and the magnet. 195. The interaction of the coil 193 can achieve the effect of reducing vibration.

In the above embodiment, as shown in FIGS. 10 and 11 , the cooling device 191 includes a casing, a water inlet 1911 , a water outlet 1912 and a spiral tube 1913 . The casing is a cylindrical structure with a water inlet 1911 and a water outlet 1912 at the top and bottom respectively. The water outlet 1912 communicates. In use, circulating water flows from the water inlet 1911 and the water outlet 1912 to cool the heat generated by the ball bearing 198 and the bearing seat 197, the damping oil and the recovery coil in the damping device through heat transfer.

In the above embodiment, the damping device 19 is further provided with an energy recovery device. In the damping device 19, through the interaction of the permanent magnet 195 and the coil 193, an induced voltage is generated, and this energy can be reused by the energy recovery device. When in use, the energy recovery device can reduce the vibration of the mandrel 18, dissipate heat from the lower bearing, and recover the vibration energy, thereby improving the energy efficiency of the system.

In the above embodiment, on the upper part of the casing 11 , the motor/generator 3 is provided on the mandrel 18 below the permanent magnet bearing 5 .

In the above embodiment, the upper radial displacement sensor 4 and the lower radial displacement sensor 16 are respectively arranged at the upper auxiliary bearing 6 and the lower auxiliary bearing 17; the axial displacement sensor 8 is arranged at the lower part of the mandrel 18; The displacement sensor 8 , the upper radial displacement sensor 4 and the lower radial displacement sensor 16 sense the vibration state of the flywheel 1 .

To sum up, for the bearing support system for the energy storage of the flywheel in the present invention, a variety of bearings are used to mix and work together to suspend the flywheel and reduce friction as much as possible. At the bottom of the flywheel, there is a repulsive Halbach ring array magnetic levitation device. By combining the magnets in a radial or parallel arrangement according to a certain arrangement rule, the arranged permanent magnet structure will eventually form a unilateral with great magnetic force. Magnetic field, by setting up and down two sets of Halbach ring arrays, clearance fit and mutual repulsion, provide axial force to the flywheel to make it levitate. There is an axial permanent magnet bearing for unloading, which is composed of a permanent magnet embedded in the casing and a permanent magnet embedded in the upper end face of the flywheel rotor, and the N pole is opposite to the S pole. Axial force, cooperate with Halbach ring array magnetic suspension device to provide axial force to complete the suspension of the flywheel. An upper rolling bearing and a lower rolling bearing are respectively installed on the upper and lower ends of the flywheel rotating body to support the flywheel to rotate, and the utility model has the advantages of simple structure and low cost.

A set of electromagnetic vibration exciters are arranged on the upper and lower sides of the flywheel. The electromagnetic vibration exciter can directly use the electromagnetic force as the exciting force, and can understand the mode of the flywheel shaft system by exciting the shaft system of the flywheel rotor. The traditional design needs to test the modal characteristics before the flywheel rotor is installed. Generally, it is hit with a force hammer to excite the inherent mode of the rotor and measure it. Hammer knocking is easy to cause mechanical damage to the rotor surface, and the modal characteristics of the flywheel before the bearing is installed are quite different from the structural modal after assembly, resulting in inaccurate modal measurement of the flywheel knocking. The electromagnetic excitation device of the present invention can perform non-contact excitation on the rotor of the flywheel. The flywheel is in a static or rotating state, and the modal frequency of the entire shaft system can be excited non-contact, and the gyro effect and bearing characteristics can be considered in real time for the shaft system. Compared with the traditional modal measurement, the influence caused by the modal has the technical advantages of online, real-time and accurate.

For the vibration of the flywheel when it rotates at a high speed, the vibration is reduced by setting a damping device at the bottom of the flywheel energy storage system. The damper adopts oil damping, and the damping body in the damper is installed with a permanent magnet, and the outer casing of the damper is installed. A coil is arranged in the coil for interacting with the magnet damping body. At the same time, a squeeze oil film is arranged in the damper, which has shock absorption and stabilization effects on the flywheel energy storage system. The shock absorption effect can also be adjusted by changing the oil pressure and oil temperature of the squeeze oil film, and the damping oil can also dissipate heat from the damper.

When the vibration of the energy storage flywheel is reduced by the damping device, the present invention also sets an energy recovery device in the damping device to recover and utilize this part of the vibration energy. In the damper, a magnet and a coil are arranged, and the magnet and the coil will interact during damping and generate an induced voltage, which plays the role of energy recovery.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A multifunctional energy storage flywheel system with damping energy recovery and online modal monitoring, comprising:

the bearing device comprises a shell (11), a bearing end cover (9) is arranged at the top of the shell, and a base (15) is arranged at the bottom in the shell (11);

the mandrel (18) penetrates through the shell (11), the flywheel (1) is arranged in the middle of the mandrel (18), the top of the mandrel (18) is movably connected with the bearing end cover (9), and the bottom of the mandrel (18) penetrates through the base (15) and extends to the outside of the bottom of the shell (11) to form an extending part;

the upper auxiliary bearing (6) is arranged at the top of the mandrel (18) and is used for supporting the rotation of the flywheel (1);

the permanent magnet bearing (5) is positioned below the upper auxiliary bearing (6), is arranged between the upper end surface of the mandrel (18) and the shell (11), and is used for providing axial force for the flywheel (1);

the repulsion Halbach circular ring array magnetic suspension device is arranged between the base (15) and the mandrel (18), provides axial force for the flywheel (1), and is matched with the permanent magnet bearing (5) to enable the flywheel (1) to complete suspension;

a lower auxiliary bearing (17) disposed between the bottom of the housing (11) and the spindle (18) for supporting rotation of the flywheel (1).

2. The multifunctional energy storage flywheel system with damped energy recovery and online modal monitoring as claimed in claim 1, characterized in that the outer ring of the upper auxiliary bearing (6) is arranged on the inner wall surface of the housing (11), the inner ring of the upper auxiliary bearing (6) is installed with the spindle (18) in a matching manner, and the upper auxiliary bearing (6) is positioned by the upper shoulder of the spindle (18).

3. The multifunctional energy storage flywheel system with damped energy recovery and online modal monitoring according to claim 1, characterized in that the permanent magnet bearing (5) comprises an upper permanent magnet (51), an axial displacement sensor probe (52) and a lower permanent magnet (53);

the upper permanent magnet (51) is embedded in the inner wall surface of the shell (11), the lower permanent magnet (53) is embedded in the upper end surface of the mandrel (18), the polarity of the upper permanent magnet (51) is opposite to that of the lower permanent magnet (53), the permanent magnets are arranged in a circular ring shape, and the circular ring is concentric with the mandrel (18);

the axial displacement sensor probe (52) is arranged between the upper permanent magnet (51) and the lower permanent magnet (53) and is used for measuring the dynamic and static gaps of the permanent magnet bearing (5) in real time to ensure that the gaps are within a preset range.

4. The multifunctional energy-storing flywheel system with damped energy recovery and online modal monitoring as claimed in claim 1, wherein the repulsive Halbach circular ring array magnetic levitation device comprises a support sleeve (12), an upper Halbach circular ring array (13) and a lower Halbach circular ring array (14);

the support sleeve (12) is arranged on a lower shaft shoulder of the mandrel (18), the upper Halbach circular ring array (13) is arranged on the support sleeve (12), the lower Halbach circular ring array (14) is arranged on the base (15), and the upper Halbach circular ring array (13) and the lower Halbach circular ring array (14) are formed by sequentially arranging and bonding a plurality of small circular rings to form a single-side magnetic field;

and the upper Halbach circular ring array (13) and the lower Halbach circular ring array (14) are symmetrically arranged, are in clearance fit and mutually repel, and provide axial force for the flywheel (1).

5. The multifunctional energy storage flywheel system with damping energy recovery and online modal monitoring as claimed in claim 1, characterized in that, a set of electromagnetic exciters (2) for monitoring the modal characteristics of the flywheel are respectively arranged in the upper part and the lower part of the flywheel (1) in the housing (11), and the electromagnetic exciters (2) are installed with the mandrel (18) in a non-contact way;

the electromagnetic vibration exciter (2) comprises an E-shaped iron core (21), an exciting coil (22) and a force measuring coil (23); the excitation coil (22) and the force measuring coil (23) are respectively wound in an upper groove and a lower groove of the E-shaped iron core (21); the excitation coil (22) excites the flywheel (1) to obtain the mode of the flywheel, and the force measuring coil (23) is used for monitoring the force output of the electromagnetic vibration exciter (2).

6. The multifunctional energy storage flywheel system with damped energy recovery and online modal monitoring as claimed in claim 1, characterized in that a damping device (19) is provided outside the bottom of the housing (11);

the damping device (19) comprises a damping device shell (190), and a cooling device (191), a damping body shell (192), an O-shaped ring (194), a permanent magnet (195), a damping body (196), a bearing seat (197), a ball bearing (198) and an extrusion oil film (199) which are arranged in the damping device shell (190);

the damping device shell (190) is arranged on the outer side of the bottom of the shell (11), the damping body shell (192) is arranged in the damping device shell (190), and the cooling device (191) is arranged between the damping device shell (190) and the damping body shell (192);

the damping body (196) is installed in a clearance fit mode with the damping body shell (192), the O-shaped ring (194) is arranged on the upper portion and the lower portion of the clearance, the O-shaped ring (194) adopts a structure centering on a shaft neck, and the O-shaped ring (194), the damping body (196) and the damping body shell (192) form a sealing environment to form the squeeze oil film (199);

a tile-shaped groove is formed in the outer circular surface of the damping body (196), and a tile-shaped permanent magnet (195) is embedded in the tile-shaped groove;

the bearing seat (197) is matched with the inner circular surface of the damping body (196) and is positioned in the middle of the damping device shell (190); the ball bearing (198) is arranged on the lower end of the extending portion of the mandrel (18) in the circumferential direction, and the ball bearing (198) is installed in a matched mode with the bearing seat (197).

7. The multifunctional energy storage flywheel system with damped energy recovery and online modal monitoring as set forth in claim 6, characterized in that the damping body housing (192) is of a hollow structure, a coil (193) is arranged in the hollow structure, and the coil (193) interacts with the permanent magnet (195) to generate an induced voltage; the upper part and the lower part of the inner wall surface of the damping body shell (192) are respectively provided with a sealing groove (1921) for containing the O-shaped ring (194), and an oil outlet (1922) and an oil inlet (1923) are respectively arranged on two sides of the damping body shell (192).

8. The multifunctional energy storing flywheel system with damped energy recovery and online mode monitoring as claimed in claim 6, characterized in that the cooling device (191) comprises a housing, a water inlet (1911), a water outlet (1912) and a spiral (1913); the shell is of a cylindrical structure, the water inlet (1911) and the water outlet (1912) are formed in the top and the bottom of the shell respectively, the spiral pipe (1913) is arranged in the shell, one end of the spiral pipe (1913) is communicated with the water inlet (1911), and the other end of the spiral pipe (1913) is communicated with the water outlet (1912).

9. The multifunctional energy storage flywheel system with damping energy recovery and online modal monitoring as claimed in claim 1, characterized in that an all-in-one motor/generator (3) is arranged on the mandrel (18) below the permanent magnet bearing (5) at the upper part of the housing (11).

10. The multifunctional energy storage flywheel system with damped energy recovery and online modal monitoring as claimed in claim 1, characterized in that an upper radial displacement sensor (4), a lower radial displacement sensor (16) are provided at the upper auxiliary bearing (6) and the lower auxiliary bearing (17), respectively; an axial displacement sensor (8) is arranged at the lower part of the mandrel (18); and sensing the vibration state of the flywheel (1) through the axial displacement sensor (8), the upper radial displacement sensor (4) and the lower radial displacement sensor (16).

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