An energy storage device

Abstract

The present invention discloses an energy storage device that utilizes the flow inertia of a fluid in an elongated spiral tube to realize the dynamic characteristics of an inertial volume. At the same time, a structural form in which a rotating motor and a magnetic speed increaser are coupled is adopted to realize an "increase speed and energy feeding" working mode. In the "increase speed and energy feeding" mode, a magnetic speed increaser is provided to increase the rotation speed of the rotating motor. When the input shaft of the magnetic speed increaser rotates, the input disk is driven to rotate. The bolts on the intermediate disk cause the magnetization direction to continuously change, thereby driving the output disk to rotate at an increase speed. The increase speed ratio is 1:4, which can improve the recovery efficiency of vibration energy. The energy storage device described in the present invention can realize complex system impedance output, is less affected by nonlinear factors, and has excellent dynamic performance. It can effectively save installation space and realize vibration energy recovery.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering vibration isolation, and particularly relates to an energy storage device. Background Art

[0002] As an assembly that bears the weight of the vehicle body and buffers the impact of road irregularities, the quality of the suspension significantly impacts the vehicle's driving performance. To overcome the performance bottleneck of the traditional mechanical vibration isolation system (mass-spring-damper) and address the single-terminal problem of the mass element, the inertia chamber was developed. The resulting novel mechanical vibration isolation network (inertia chamber-spring-damper) has demonstrated significant potential for vibration isolation and has been proven in numerous vibration isolation applications.

[0003] In domestic and international research, a variety of high-performance ISD network vibration isolation structures have been proposed and their effective vibration isolation advantages have been verified. According to the new electromechanical similarity theory, an inertia capacitor corresponds to a capacitive element in an electrical network. Currently, the more common inertia capacitor implementations include ball screw, rack and pinion, and hydraulic pump types. Nonlinear factors such as backlash and friction significantly affect their practical performance. Fluid inertia capacitors utilize the inertial effect generated by fluid passing through a slender spiral tube to achieve the dynamic characteristics of the inertia capacitor. Due to its simple structure, the inertia capacitor and damping coupling can be designed as an integrated device, making it widely adopted. However, more complex mechanical network structures are difficult to integrate into a single structure. With the accelerated advancement of vehicle electrification and energy conservation, new energy vehicles have become a research hotspot in the automotive engineering field. How to achieve energy recovery during driving in new energy vehicles while effectively improving the vibration isolation performance of the suspension system has become a core technology for new energy vehicle chassis. Summary of the Invention

[0004] The purpose of the present invention is to provide an energy storage device to solve the problems faced in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: an energy storage device, comprising a hydraulic cylinder and a power generation device;

[0006] Among them, the hydraulic cylinder includes a hydraulic cylinder upper end surface 2, a hydraulic cylinder housing 4, a piston rod 6, an auxiliary plate 7, a hydraulic cylinder piston 28, an upper working chamber 29 of the hydraulic cylinder, and a lower working chamber 5 of the hydraulic cylinder; the hydraulic cylinder piston 28 and the piston rod 6 are fixedly connected, dividing the hydraulic cylinder into an upper working chamber 29 of the hydraulic cylinder and a lower working chamber 5 of the hydraulic cylinder; the spiral tube 3 is spirally arranged on the outside of the hydraulic cylinder housing 5, the upper end of the spiral tube 3 is connected to the upper working chamber 29 of the hydraulic cylinder, and the lower end of the spiral tube 3 is connected to the lower working chamber 5 of the hydraulic cylinder; the auxiliary plate 7 is located below the lower end of the spiral tube 3, and the auxiliary plate 7 is welded to the hydraulic cylinder housing 4 as a whole; wherein, the lower end of the piston rod 6 is fixedly connected to the lead screw 25, the lead screw 25 extends out of the hydraulic cylinder and extends into the power generation device, and the lead screw nut 27 matched with the lead screw 25 is installed at the lower end of the hydraulic cylinder through the lead screw nut mounting bolt 26;

[0007] The power generation device further includes a power generation device housing 11 and a rotating motor. A rotating motor housing 14 is provided inside the power generation device housing 11 and the rotating motor housing 14 is fixed to the inner wall of the power generation device housing 11.

[0008] The power generation device further includes a magnet speed increaser 13; the magnet speed increaser 13 is arranged in the power generation device housing 11;

[0009] The magnet speed increaser 13 is connected between the lead screw 25 and the rotating motor.

[0010] Furthermore, the magnet speed increaser 13 includes a magnet speed increaser input shaft 12, an input disc 13A, an auxiliary shaft 13B, an input disc magnet 13C, an input disc bearing 13D, a bolt 13E, an output disc 13F, an intermediate disc 13G, an output disc bearing 13H, and an output disc magnet 13I;

[0011] Among them, the magnetic speed increaser input shaft 12 is fixedly connected to the input disc 13A, and the input disc 13A is installed on the auxiliary shaft 13B through the input disc bearing 13D. M input disc magnets 13C are evenly arranged on the input disc 13A along the circumferential direction, and the positive and negative poles of the magnets are staggered; an intermediate disc 13G is provided below the input disc 13A, and the intermediate disc 13G is fixed in the power generation device housing 11. The auxiliary shaft 13B passes through the center hole of the intermediate disc 13G, and the auxiliary shaft 13B and the intermediate disc 13G are interference fit; M bolts 13E are evenly arranged on the intermediate disc 13G along the circumferential direction; an output disc 13F is provided below the intermediate disc 13G, and the output disc 13F is installed on the auxiliary shaft 13B through the output disc bearing 13H. N output disc magnets 13I are evenly arranged on the output disc 13F along the circumferential direction, and the positive and negative poles of the magnets are staggered.

[0012] Furthermore, M and N are both natural numbers greater than 1, and M>N.

[0013] Furthermore, the lead screw 25 is connected to the magnet speed increaser input shaft 12 through a coupling 10 .

[0014] Furthermore, the spiral tube 3, the upper working chamber 29 of the hydraulic cylinder, and the lower working chamber 5 of the hydraulic cylinder are filled with incompressible hydraulic oil. The hydraulic oil flows back and forth through the upper working chamber 29 of the hydraulic cylinder, the upper port of the spiral tube 3, the lower port of the spiral tube 3, and the lower working chamber 5 of the hydraulic cylinder under the action of thrust. The flow of the fluid in the spiral tube 3 forms an inertia container.

[0015] Furthermore, an upper lifting lug 1 is fixedly connected to the upper end surface 2 of the hydraulic cylinder, and the upper lifting lug 1 is connected to the upper end point of the vibration isolation system; a lower lifting lug 17 is fixedly installed on the lower part of the power generation device housing 11, and the lower lifting lug 17 is connected to the lower end point of the vibration isolation system.

[0016] Furthermore, a dust cover 8 is fixedly installed between the hydraulic cylinder and the power generation device, and the lead screw nut 27 and the lead screw 25 are both located inside the dust cover 8.

[0017] Furthermore, a rotating motor rotor shaft 20 is provided inside the rotating motor housing 14, and a rotating motor center rotor 19 is provided around the rotating motor rotor shaft 20, and the rotating motor center rotor 19 is fixed on the rotating motor rotor shaft 20, and the rotating motor stator 15 is fixed on the rotating motor housing 14; the rotating motor upper end cover bearing 22 and the rotating motor lower end cover bearing 18 are respectively mounted on the upper end cover 21 and the lower end cover 16 of the rotating motor housing 14 in cooperation with the rotating motor rotor shaft 20; the rotating motor rotor shaft 20 and the rotating motor center rotor 19 can rotate within the rotating motor housing 14.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention utilizes the flow inertia of the fluid in the slender spiral tube to realize the dynamic characteristics of the inertial capacity, and at the same time adopts a structural form in which the rotating motor and the magnet speed increaser are coupled, which can realize the "speed-increasing energy feeding" working mode. In the "speed-increasing energy feeding" mode, the rotation speed of the rotating motor is increased by setting a magnet speed increaser. When the input shaft of the magnet speed increaser rotates, it can drive the input disk to rotate. Since the bolts on the intermediate disk cause the magnetization direction to change continuously, the output disk is driven to rotate at a speed-increasing ratio of 1:4, which can improve the recovery efficiency of vibration energy. The energy storage device described in the present invention can realize complex system impedance output, is less affected by nonlinear factors, and has excellent dynamic performance, can effectively save installation space and realize vibration energy recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and examples.

[0020] Figure 1 It is a structural diagram of an energy storage device.

[0021] Figure 2 It is a schematic diagram of the magnet speed increaser structure.

[0022] Figure 3 It is a structural diagram of another position of the magnet speed increaser.

[0023] Description of reference numerals:

[0024] 1-upper lifting ear, 2-upper end face of hydraulic cylinder, 3-spiral tube, 4-hydraulic cylinder housing, 5-lower working chamber of hydraulic cylinder, 6-piston rod, 7-auxiliary plate, 8-dust cover, 9-angular contact ball bearing, 10-coupling, 11-generator housing, 12-magnet speed increaser input shaft, 13-magnet speed increaser, 13A-input disc, 13B-auxiliary disc, 13C-input disc magnet, 13D-input disc bearing, 13E-bolt, 13F-output disc, 13G-intermediate disc, 13H-output disc shaft Bearing, 13I-output disk magnet, 14-rotating motor housing, 15-rotating motor stator, 16-rotating motor lower end cover, 17-lower lifting ear, 18-rotating motor lower end cover bearing, 19-rotating motor center rotor, 20-rotating motor rotor shaft, 21-rotating motor upper end cover, 22-rotating motor upper end cover bearing, 23-end cover, 24-flange mounting bolts, 25-screw, 26-screw nut mounting bolts, 27-screw nut, 28-hydraulic cylinder piston, 29-hydraulic cylinder upper working chamber. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1 The present invention is further described with reference to specific embodiments. It should be noted that the technical solution and design principle of the present invention are described in detail below with only one optimized technical solution, but the protection scope of the present invention is not limited thereto.

[0026] like Figure 1As shown, an energy storage device includes a hydraulic cylinder and a power generation device. The hydraulic cylinder includes an upper end surface 2, a hydraulic cylinder housing 4, a piston rod 6, an auxiliary plate 7, a hydraulic cylinder piston 28, an upper working chamber 29, and a lower working chamber 5. An upper lifting lug 1 is fixedly connected (e.g., welded) to the upper end surface 2 of the hydraulic cylinder. The upper lifting lug 1 is connected to the upper end of the vibration isolation system. The hydraulic cylinder piston 28 and the piston rod 6 are fixedly connected, dividing the hydraulic cylinder into an upper working chamber 29 and a lower working chamber 5. A spiral tube 3 is spirally disposed on the exterior of the hydraulic cylinder housing 4. The upper end of the spiral tube 3 communicates with the upper working chamber 29, and the lower end of the spiral tube 3 communicates with the lower working chamber 5. The spiral tube 3, the upper working chamber 29, and the lower working chamber 5 are filled with incompressible hydraulic oil. The hydraulic oil, under the action of thrust, reciprocates through the upper working chamber 29, the upper end of the spiral tube 3, the lower end of the spiral tube 3, and the lower working chamber 5. The flow of fluid in the spiral tube 3 forms an inertia vessel. The auxiliary plate 7 is located below the lower end of the spiral tube 3 , and the auxiliary plate 7 is welded to the hydraulic cylinder housing 4 as a whole.

[0027] The generator includes a generator housing 11, a magnetic speed increaser 13, and a rotating electric machine. The magnetic speed increaser 13 and rotating electric machine are housed within the generator housing 11. A lower lug 17 is fixedly mounted (e.g., welded) to the lower portion of the generator housing 11 and connects to the lower endpoint of the vibration isolation system.

[0028] The lower end of the piston rod 6 is fixedly connected to a lead screw 25. The lead screw 25 extends out of the hydraulic cylinder and into the generator. A lead screw nut 27, which mates with the lead screw 25, is mounted on the lower end of the hydraulic cylinder via lead screw nut mounting bolts 26. A dust cover 8 is fixedly mounted between the hydraulic cylinder and the generator. The lead screw nut 27 and lead screw 25 are both located inside the dust cover 8. Flange mounting bolts 24 secure an end cap 23 to the upper end of the generator housing 11. An angular contact ball bearing 9 is mounted inside the end cap 23, and the lead screw 25 is mounted within the angular contact ball bearing 9.

[0029] Among them, such as Figure 2 、 Figure 3 As shown, the magnet speed increaser 13 includes a magnet speed increaser input shaft 12, an input disc 13A, an auxiliary shaft 13B, an input disc magnet 13C, an input disc bearing 13D, bolts 13E, an output disc 13F, an intermediate disc 13G, an output disc bearing 13H, and an output disc magnet 13I.

[0030] The lead screw 25 is connected to the magnet speed increaser input shaft 12 via a coupling 10. The magnet speed increaser input shaft 12 is fixedly connected to an input disc 13A, which is mounted on an auxiliary shaft 13B via an input disc bearing 13D. M input disc magnets 13C are evenly distributed along the circumference of the input disc 13A, with the positive and negative poles of the magnets alternating. Below the input disc 13A is an intermediate disc 13G, which is fixed to the generator housing 11. An auxiliary shaft 13B passes through the center hole of the intermediate disc 13G, forming an interference fit between the auxiliary shaft 13B and the intermediate disc 13G. M bolts 13E are evenly distributed along the circumference of the intermediate disc 13G. Below the intermediate disc 13G is an output disc 13F, which is mounted on the auxiliary shaft 13B via an output disc bearing 13H. N output disc magnets 13I are evenly distributed along the circumference of the output disc 13F, with the positive and negative poles alternating.

[0031] Among them, M and N are both natural numbers greater than 1, and M>N.

[0032] A rotating electrical machine housing 14 is also located within the generator housing 11 and is secured to the inner wall of the generator housing 11. A rotating electrical machine rotor shaft 20 is located within the rotating electrical machine housing 14. A rotating electrical machine center rotor 19 is positioned around the rotating electrical machine rotor shaft 20 and secured to the rotating electrical machine rotor shaft 20. The rotating electrical machine stator 15 is secured to the rotating electrical machine housing 14. The rotating electrical machine upper end cap bearing 22 and the rotating electrical machine lower end cap bearing 18 are mounted on the upper end cap 21 and lower end cap 16 of the rotating electrical machine housing 14, respectively, in conjunction with the rotating electrical machine rotor shaft 20. The rotating electrical machine rotor shaft 20 and the rotating electrical machine center rotor 19 are capable of rotational movement within the rotating electrical machine housing 14.

[0033] The rotating motor rotor shaft 20 is fixedly connected to the output disc 13F. When the magnet speed increaser input shaft 12 rotates, it can drive the input disc 13A to rotate. The input disc 13A is evenly provided with M input disc magnets 13C with positive and negative poles arranged in an alternating manner along the circumference. The output disc 13F is evenly provided with N output disc magnets 13I with positive and negative poles arranged in an alternating manner along the circumference. Because the bolts 13E on the intermediate disc 13G cause the magnetization direction to continuously change, a mutual repulsive force will be generated between the input disc magnets 13C and the output disc magnets 13I, thereby driving the output disc 13F to rotate at an increased speed. The speed increase ratio of the input disc 13A to the output disc 13F is N:M.

[0034] By analyzing the working principle of the hydraulic cylinder, we can know that:

[0035] When the piston rod produces an up and down displacement x, according to the principle of volume conservation, we can get:

[0036]

[0037] Where: θ is the corresponding angle of fluid entering the spiral tube, h is the pitch of the spiral tube, r4 is the spiral radius of the spiral tube, S1 is the effective cross-sectional area in the hydraulic cylinder; S2 is the effective cross-sectional area of ​​the spiral tube, where:

[0038] S1=π(r2 2 -r1 2 ) (2)

[0039] Where: r1 is the radius of the piston rod; r2 is the inner radius of the hydraulic cylinder.

[0040] S2=πr3 2 (3)

[0041] Where: r3 is the radius of the spiral tube.

[0042] The moment of inertia J generated by the fluid rotating in the spiral tube is:

[0043] J=mr4 2 (4)

[0044] Where: m is the mass of the fluid in the spiral tube.

[0045] m=ρS2l (5)

[0046] Where: l is the length of the spiral tube; ρ is the fluid density.

[0047] According to the law of conservation of energy, we can get:

[0048]

[0049] Combining equations (1) to (6), we can get the inertia coefficient b of the fluid inertia container:

[0050]

[0051] Assume that parameter p is the lead of the screw and v is the relative speed between the upper and lower lugs. Then the angular velocity of the screw is ω e (unit: rad / s) can be expressed as:

[0052]

[0053] As the input shaft of the magnet speed increaser rotates, the input disc is driven to rotate. The bolts on the intermediate disc cause the magnetization direction to change continuously, thereby driving the output disc to rotate at an increased speed. The speed increase ratio is N:M.

[0054] At this time, the induced electromotive force generated by the rotating motor is:

[0055]

[0056] Where V e is the induced electromotive force generated by the rotating motor; K e is the electromotive force constant of the rotating motor.

[0057] Assuming that the external circuit of the rotating motor forms a closed loop, the parameter I e Represents the loop current, parameter K t is the torque constant of the rotating motor, then the electromagnetic torque T e It can be expressed as:

[0058] T e =K t I e (10)

[0059] Furthermore, the induced electromotive force V e Current I e Perform Laplace transform to obtain the induced electromotive force V under Laplace transform e (s), current I e (s), then the relationship between them can be expressed as:

[0060]

[0061] Where R e is the equivalent internal resistance of the rotating motor, L e is the inductance of the rotating motor, Z e (s) is the impedance expression of the external circuit of the rotating motor, and s is a pull-type variable.

[0062] The electromagnetic torque generated by the rotating motor is converted into an axial force F b It can be expressed as:

[0063]

[0064] F b (s) is the electromagnetic torque generated by the rotating motor converted into the axial force F b is the Laplace transform of , and v(s) is the Laplace transform of the relative velocity v between the upper and lower lugs.

[0065] Therefore, the expression of the electromagnetic damping force F generated by the energy storage device proposed in the present invention can be obtained as follows:

[0066]

[0067] F(s) is the Laplace transform of the electromagnetic damping force F generated by the energy storage device. It can be seen that by changing the external circuit impedance Z of the rotating motor e (s) can realize the change of the damping force of the device, greatly broadening the range of complex network impedance that can be achieved, and can effectively improve the vibration isolation performance of the device.

[0068] The energy storage device proposed in this invention can implement a "speed-up and energy-feedback" operating mode: a magnetic speed-up gearbox is provided to increase the speed of the rotating motor. When the input shaft of the magnetic speed-up gearbox rotates, it drives the input disc to rotate. Bolts on the intermediate disc continuously change the magnetization direction, thereby driving the output disc to rotate at a speed-up ratio of N:M, which can improve the efficiency of vibration energy recovery. Furthermore, when the rotating motor is in the energy-feeding state, the relative motion between the upper and lower lifting lugs is used to put the rotating motor into the power generation state. The generated terminal voltage can be connected to an external energy recovery circuit to recover the system's vibration energy for energy input to other control systems.

[0069] The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essence of the invention shall fall within the scope of protection of the present invention.

Claims

1. An energy storage device comprising a hydraulic cylinder and a power generation device; wherein: The hydraulic cylinder comprises an upper end surface (2) of the hydraulic cylinder, a hydraulic cylinder housing (4), a piston rod (6), an auxiliary plate (7), a hydraulic cylinder piston (28), an upper working chamber (29) of the hydraulic cylinder, and a lower working chamber (5) of the hydraulic cylinder; the hydraulic cylinder piston (28) and the piston rod (6) are fixedly connected, and the hydraulic cylinder is divided into an upper working chamber (29) of the hydraulic cylinder and a lower working chamber (5) of the hydraulic cylinder; a spiral tube (3) is spirally arranged on the outside of the hydraulic cylinder housing (4), an upper end of the spiral tube (3) is communicated with the upper working chamber (29) of the hydraulic cylinder, and a lower end of the spiral tube (3) is communicated with the lower working chamber (5) of the hydraulic cylinder; the auxiliary plate (7) is located at the spiral tube. The hydraulic cylinder housing (4) is welded to the lower end of the piston rod (6), wherein the lower end of the piston rod (6) is fixedly connected to the lead screw (25), the lead screw (25) extends out of the hydraulic cylinder and extends into the generator, and the lead screw nut (27) matched with the lead screw (25) is installed on the lower end of the hydraulic cylinder through the lead screw nut mounting bolt (26); the generator further comprises a generator housing (11) and a rotary motor, the generator housing (11) is provided with a rotary motor housing (14), and the rotary motor housing (14) is fixed to the inner wall of the generator housing (11); characterized in that, The power generation device further comprises a magnet speed increaser (13); the magnet speed increaser (13) is arranged in the power generation device housing (11); the magnet speed increaser (13) is connected between the lead screw (25) and the rotating motor; wherein the magnet speed increaser (13) comprises a magnet speed increaser input shaft (12), an input disc (13A), an auxiliary shaft (13B), an input disc magnet (13C), an input disc bearing (13D), a bolt (13E), an output disc (13F), an intermediate disc (13G), an output disc bearing (13H), and an output disc magnet (13I); The magnet speed increaser input shaft (12) is fixedly connected to the input disc (13A), the input disc (13A) is mounted on the auxiliary shaft (13B) via an input disc bearing (13D), and M input disc magnets (13C) are evenly arranged along the circumferential direction on the input disc (13A), and the positive and negative poles of the magnets are staggered; an intermediate disc (13G) is arranged below the input disc (13A), and the intermediate disc (13G) is fixed in the power generation device housing (11), and the auxiliary shaft (13B) passes through the intermediate disc. The center hole of the disk (13G) is formed, and the auxiliary shaft (13B) and the intermediate disk (13G) are interference-fitted; M bolts (13E) are evenly arranged on the intermediate disk (13G) along the circumferential direction; an output disk (13F) is arranged below the intermediate disk (13G), and the output disk (13F) is mounted on the auxiliary shaft (13B) through an output disk bearing (13H); N output disk magnets (13I) are evenly arranged on the output disk (13F) along the circumferential direction, and the positive and negative poles of the magnets are staggered; The spiral tube (3), the upper working chamber (29) of the hydraulic cylinder, and the lower working chamber (5) of the hydraulic cylinder are filled with incompressible hydraulic oil. The hydraulic oil is subjected to thrust and reciprocates through the upper working chamber (29) of the hydraulic cylinder, the upper port of the spiral tube (3), the lower port of the spiral tube (3), and the lower working chamber (5) of the hydraulic cylinder. The flow of the fluid in the spiral tube (3) forms an inertia container.

2. An energy storage device according to claim 1, characterized in that: in, Both M and N are natural numbers greater than 1, and M>N.

3. An energy storage device according to claim 2, characterized in that: The lead screw (25) is connected to the magnet speed increaser input shaft (12) via a coupling (10).

4. An energy storage device according to any one of claims 1 to 3, characterized in that: An upper lifting lug (1) is fixedly connected to the upper end surface (2) of the hydraulic cylinder, and the upper lifting lug (1) is connected to the upper end point of the vibration isolation system; a lower lifting lug (17) is fixedly installed on the lower part of the power generation device housing (11), and the lower lifting lug (17) is connected to the lower end point of the vibration isolation system.

5. An energy storage device according to any one of claims 1 to 3, characterized in that: A dust cover (8) is fixedly installed between the hydraulic cylinder and the power generation device, and the lead screw nut (27) and the lead screw (25) are both located inside the dust cover (8).

6. An energy storage device according to any one of claims 1 to 3, characterized in that: A rotating motor rotor shaft (20) is provided inside the rotating motor housing (14), a rotating motor center rotor (19) is provided around the rotating motor rotor shaft (20), the rotating motor center rotor (19) is fixed on the rotating motor rotor shaft (20), and the rotating motor stator (15) is fixed on the rotating motor housing (14); the rotating motor upper end cover bearing (22) and the rotating motor lower end cover bearing (18) are respectively matched with the rotating motor rotor shaft (20) and mounted on the upper end cover (21) and the lower end cover (16) of the rotating motor housing (14); the rotating motor rotor shaft (20) and the rotating motor center rotor (19) can perform rotational motion in the rotating motor housing (14).

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