Flywheel energy storage unit base and mounting method thereof

Abstract

The invention provides a flywheel energy storage unit base and a mounting method thereof, and belongs to the technical field of flywheel energy storage. The first anti-vibration pad is connected with the energy storage unit, the second anti-vibration pad is connected with the mounting surface, the buffer block is arranged between the first anti-vibration pad and the second anti-vibration pad, one side of the buffer block is fixedly connected with the first anti-vibration pad, and the other side of the buffer block is fixedly connected with the second anti-vibration pad; the first anti-vibration pad and the second anti-vibration pad are rubber anti-vibration pads, serve as damping layers of the energy storage unit and the mounting face, have the capacity of absorbing vibration and reducing impact and meanwhile reduce direct contact between equipment and the hard surface, and therefore the influence of vibration on the equipment can be reduced while the structural stability is kept.

Description

Technical Field

[0001] The present invention relates to the technical field of flywheel energy storage, and more particularly to a base for a flywheel energy storage unit and an installation method thereof. Background Art

[0002] Flywheel energy storage technology is a physical energy storage method that stores energy through a high-speed rotating flywheel rotor. During energy storage, electrical energy is converted by a power converter and then drives an electric motor to operate. The electric motor drives the flywheel to accelerate and rotate, and the flywheel stores energy in the form of kinetic energy. During energy release, the flywheel drives the electric motor to generate electricity, completing the process of converting mechanical kinetic energy into electrical energy. In order to reduce frictional losses during the rotation of the flywheel, magnetic bearings are usually used in flywheel energy storage systems. Magnetic bearings are divided into passive magnetic bearings (PMB) and active magnetic bearings (AMB). Passive magnetic bearings, such as high-temperature superconducting magnetic bearings, use the diamagnetism of superconductors to generate repulsive forces to suspend the flywheel. Active magnetic bearings are electromagnetic suspension systems that achieve stable suspension of the rotor through sensors, control systems, and power amplifiers. The flywheel requires a stable environment during suspension to avoid external interference.

[0003] Therefore, there is an urgent need for a base that can better buffer the flywheel energy storage unit and avoid external interference. Summary of the Invention

[0004] In view of this, the present invention utilizes a composite base structure to stably control the magnetic bearing, without being disturbed by external vibrations, ensuring that the flywheel rotor always rotates at the central position and eliminating the risk of flywheel runaway caused by external vibrations.

[0005] The technical solution of the present invention is realized as follows: A base for a flywheel energy storage unit includes a first shock pad and a second shock pad. The first shock pad is connected to the energy storage unit, and the second shock pad is connected to the installation surface. It further includes a buffer block disposed between the first shock pad and the second shock pad. One side of the buffer block is fixedly connected to the first shock pad, and the other side of the buffer block is fixedly connected to the second shock pad.

[0006] Based on the above technical solution, preferably, the buffer block includes a first connecting plate, a second connecting plate, and a buffer body. The first connecting plate is disposed on one side of the buffer body, and the second connecting plate is disposed on the other side of the buffer body.

[0007] Based on the above technical solution, preferably, the first connecting plate is fixedly connected to the first shock pad, and the second connecting plate is fixedly connected to the second shock pad.

[0008] Based on the above technical solution, preferably, a plurality of first sealing plates are disposed on the side of the first connecting plate connected to the buffer body, and all of the plurality of first sealing plates are embedded in the buffer block.

[0009] Based on the above technical solutions, preferably, on one side of the second connecting plate connected to the buffer body, a plurality of second sealing plates are provided, and the plurality of them are all embedded in the buffer block.

[0010] Based on the above technical solutions, preferably, the buffer block further includes a lead core, the lead core is embedded in the buffer body, and the lead core is arranged between the first connecting plate and the second connecting plate.

[0011] Based on the above technical solutions, preferably, the buffer block further includes reinforcing sheets, there are a plurality of the reinforcing sheets, and the plurality of reinforcing sheets are all embedded in the buffer body.

[0012] Based on the above technical solutions, preferably, the plurality of reinforcing sheets are evenly distributed on both sides of the lead core.

[0013] Based on the above technical solutions, preferably, the plurality of reinforcing sheets are all arranged parallel to the first connecting plate and the second connecting plate.

[0014] Based on the above technical solutions, preferably, the energy storage unit is connected to an energy storage base, the bolt sequentially passes through the energy storage base, the first shock pad and the first connecting plate, and a first nut is arranged at the other end of the bolt; a stud is further included, one end of the stud is fixedly arranged in the installation surface, and the other end of the stud sequentially passes through the second shock pad and the second connecting plate and then is matched with a second nut.

[0015] Another technical solution of the present invention is realized as follows: An installation method for the base of a flywheel energy storage unit, a buffer fixing hole is opened at the central position of the buffer body, the lead core is located at one end of the buffer fixing hole, and pressure is applied to the lead core and it is vertically pressed into the buffer fixing hole.

[0016] Based on the above technical solutions, preferably, the buffer body is formed by bonding and laminating a plurality of rubber plates, and after uniformly adding reinforcing sheets in the middle, it is vulcanized and formed; the weight calculation formula of the rubber plate is: ×D

[0017] Where:

[0018] RSW = weight of rubber plate (pounds), L = length of rubber plate (inches), W = width of rubber plate (inches), T = thickness of rubber plate (inches), D = density of rubber plate (pounds per cubic foot).

[0019] Based on the above technical solutions, preferably, for the calculation of the horizontal stiffness of the buffer body, the following formula can be used:

[0020]

[0021] Where: KH1 and K H2 are the shear stiffnesses of the rubber layers in different parts respectively;

[0022] G is the shear modulus of the rubber; A 1 and A 2 are the areas of the rubber layers in different parts;

[0023] t r1 and t r2 are the thicknesses of the rubber layers in different parts; n is the number of shear units.

[0024] Vertical stiffness calculation model of the buffer body (43):

[0025]

[0026] Where: K v is the vertical stiffness of the bearing;

[0027] E c1b and E c2b are the modified compressive elastic moduli of the external and internal rubber layers respectively;

[0028] A 1 and A 2 are the areas of the external and internal rubber layers;

[0029] T r1 and T r2 are the total thicknesses of the external and internal rubber layers.

[0030] Mechanical property requirements:

[0031] Ultimate compressive strength R U (MPa): ≥70.

[0032] Measured compressive elastic modulus E 1 (MPa): E ± G×20%.

[0033] Measured shear elastic modulus G 1 (MPa): G ± G×15%.

[0034] Measured shear elastic modulus G after aging 2 (MPa): G + G×15%.

[0035] Physical property requirements of the rubber material:

[0036] Hardness (IRHD): 60 ± 5.

[0037] Tensile strength (MPa): ≥17 (neoprene), ≥18 (natural rubber).

[0038] Elongation at break (%) : ≥400 (neoprene), ≥450 (natural rubber).

[0039] The flywheel energy storage unit base of the present invention has the following beneficial effects compared with the prior art:

[0040] (1) The first shock pad and the second shock pad are rubber shock pads. As the shock-absorbing layer between the energy storage unit and the installation surface, they have the ability to absorb vibration and reduce impact, and at the same time reduce the direct contact between the equipment and the hard surface. This can reduce the impact of vibration on the equipment while maintaining structural stability. Rubber has sufficient vertical stiffness to bear the vertical load and has good elasticity. Rubber also has a large shear deformation ability to meet the horizontal displacement of the upper structure. The first shock pad and the second shock pad are made of natural rubber, which has good elasticity and wear resistance and can also provide good vibration absorption effect;

[0041] (2) The device provides sufficient strength and stability for the energy storage unit and can absorb vibration at the same time. It can also effectively resist the influence of seismic waves. It can reduce the influence of shaking during earthquakes or use on the energy storage unit, protect the energy storage unit from damage and ensure its operating stability, and increase the reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0043] Figure 1 It is a cross-sectional view of a flywheel energy storage unit base of the present invention;

[0044] Figure 2 For the present invention Figure 1 structural schematic diagram. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0046] Such as Figure 1 and 2As shown in the figure, a base for a flywheel energy storage unit includes a first shock pad 21 and a second shock pad 22. The first shock pad 21 is connected to the energy storage unit 1, and the second shock pad 22 is connected to the installation surface 3. It also includes a buffer block 4, which is arranged between the first shock pad 21 and the second shock pad 22. One side of the buffer block 4 is fixedly connected to the first shock pad 21, and the other side of the buffer block 4 is fixedly connected to the second shock pad 22. The first shock pad 21 and the second shock pad 22 are rubber shock pads, serving as shock-absorbing layers between the energy storage unit 1 and the installation surface 3, having the ability to absorb vibrations and reduce impacts while also reducing the direct contact between the equipment and the hard surface. This can reduce the impact of vibrations on the equipment while maintaining structural stability. Rubber has sufficient vertical stiffness to bear vertical loads and has good elasticity. Rubber also has a large shear deformation ability to meet the horizontal displacement of the upper structure. The first shock pad 21 and the second shock pad 22 are made of natural rubber, which has good elasticity and wear resistance and can also provide good vibration absorption effects. The thickness of the first shock pad 21 and the second shock pad 22 is generally between 10 mm and 25 mm to absorb vibrations and reduce noise. The buffer block 4 further dampens the flywheel energy storage unit between the first shock pad 21 and the second shock pad 22. The installation surface 3 can be the ground or a concrete surface.

[0047] The first shock pad 21 serves as a shock-absorbing layer connecting the energy storage unit 1 and the buffer block 4, which can reduce the impact of vibrations on the energy storage unit 1 while maintaining structural stability. The first shock pad 21 has sufficient vertical stiffness to bear vertical loads, has good elasticity, and also has a large shear deformation to meet the horizontal displacement of the upper structure; the second shock pad 22 serves as a shock-absorbing layer connecting the installation surface 3 and the buffer block 4, which can reduce the impact of vibrations on the equipment while maintaining structural stability. The second shock pad 22 has sufficient vertical stiffness to bear vertical loads, has good elasticity, and also has a large shear deformation to meet the horizontal displacement of the upper structure.

[0048] It provides sufficient strength and stability for the energy storage unit 1, can absorb vibrations at the same time, and can also effectively resist the influence of seismic waves. It can reduce the impact of shaking during earthquakes or in the process of use on the energy storage unit 1, protect the energy storage unit 1 from damage and ensure its operating stability, and increase the reliability of the equipment.

[0049] The buffer block 4 includes a first connecting plate 41, a second connecting plate 42 and a buffer body 43. The first connecting plate 41 is arranged on one side of the buffer body 43, and the second connecting plate 42 is arranged on the other side of the buffer body 43. The buffer body 43 is formed by laminating multiple layers of rubber. This structure enables the buffer body 43 to bear the gravity and horizontal force of the structure in the vertical direction. The first connecting plate 41 and the second connecting plate 42 are plate-like objects with load-bearing capacity such as steel plates or concrete plates. Since steel plates have stronger load-bearing and compressive capacities and are convenient for connection use, steel plates are preferably used.

[0050] The first connecting plate 41 is fixedly connected to the first shock pad 21, and the second connecting plate 42 is fixedly connected to the second shock pad 22.

[0051] On one side of the first connecting plate 41 connected to the buffer body 43, there are provided a plurality of first sealing plates 411, and the plurality of first sealing plates 411 are all embedded in the buffer block 43. In order to increase the connection strength between the first connecting plate 41 and the buffer body 43, the first sealing plates 411 integrally formed with the first connecting plate 41 are selected, and the first sealing plates 411 are embedded in the buffer block 43, so that the connection is more firm and the horizontal force is prevented from causing the first connecting plate 41 and the buffer body 43 to move.

[0052] On one side of the second connecting plate 42 connected to the buffer body 43, there are provided a plurality of second sealing plates 421, and the plurality of second sealing plates 421 are all embedded in the buffer block 43. In order to increase the connection strength between the second connecting plate 42 and the buffer body 43, the second sealing plates 421 integrally formed with the second connecting plate 42 are selected, and the second sealing plates 421 are embedded in the buffer block 43, so that the connection is more firm and the horizontal force is prevented from causing the second connecting plate 42 and the buffer body 43 to move.

[0053] The buffer block 4 further includes a lead core 44. The lead core 44 is embedded in the buffer body 43, and the lead core 44 is arranged between the first connecting plate 41 and the second connecting plate 42. The lead core 44 is vertically pressed into the center of the buffer block 4. The lead core 44 utilizes its elasto-plastic properties to dissipate the energy of the vibration during the earthquake motion. The diameter of the lead core 44 can be adjusted according to needs to change the absorption and energy dissipation capacity of the buffer block 4.

[0054] The lead core 44 is formed by pressing the lead core 44 into the center of the buffer body 43. After the lead core 44 is pressed in, it is integrated with the buffer body 43. At this time, the buffer body 43 is an integral type seismic isolation device of a damping mechanism composed of a rubber stable restoration device and a lead energy absorption device. Rubber, as an elastic body, has insufficient energy dissipation. Therefore, a lead core 44 is added to the buffer body 43 to provide a certain amount of damping, so that the seismic force of the lower structure is redistributed, and the displacement of the seismic isolation layer is not very large, having a good seismic isolation effect; the lead core 44 is simplified to an ideal elastoplastic material, and a bilinear isotropic hardening model is used, with a tangent modulus of 0 MPa. It can reduce the horizontal seismic action and at the same time bear a large vertical load. Rubber, as an elastic body, has insufficient energy dissipation. Therefore, a lead core 44 is added to the buffer body 43 composed of rubber to provide a certain amount of damping, so that the seismic force of the lower structure is redistributed, and the displacement of the seismic isolation layer is not very large, and it can deform to absorb energy during an earthquake and quickly return to its original state after the earthquake, having a good seismic isolation effect

[0055] The buffer block 4 further includes reinforcing sheets 45. There are several of the reinforcing sheets 45, and several of the reinforcing sheets 45 are all embedded in the buffer body 43. The reinforcing sheet 45 is a layered object with a certain structural strength. It is arranged in the layered buffer block 4. The reinforcing sheet 45 can be a structure such as a wooden board or a steel plate, and preferably a steel plate.

[0056] Several of the reinforcing sheets 45 are evenly distributed on both sides of the lead core 44. The pressure-bearing capacity on both sides of the lead core 44 is more uniform, and the effect is better. Several of the reinforcing sheets 45 are all arranged parallel to the first connecting plate 41 and the second connecting plate 42. The parallel reinforcing sheets 45 have a more uniform load-bearing capacity and a better shock-absorbing effect.

[0057] The energy storage unit 1 is connected to an energy storage base 11. The bolts sequentially pass through the energy storage base 11, the first shock pad 21 and the first connecting plate 41, and a first nut is arranged at the other end of the bolt; a stud is also included. One end of the stud is fixedly arranged in the installation surface 3, and the other end of the stud sequentially passes through the second shock pad 22 and the second connecting plate 42 and then is provided with a second nut in cooperation. As shown in the figure, the bolt and the first nut firmly fix the energy storage base 11, the first shock pad 21 and the first connecting plate 41, and the stud and the second nut firmly fix the second shock pad 22 and the second connecting plate 42. The buffer body 43 is filled with the lead core 44 and several of the reinforcing sheets 45 by rubber heat-sealing to increase the compressive strength of the buffer body 43.

[0058] A buffer fixing hole 431 is opened at the central position of the buffer body 43. The lead core 44 is located at one end of the buffer fixing hole 431, and pressure is applied to the lead core 44 and it is vertically pressed into the buffer fixing hole 431.

[0059] The buffer body 43 is formed by laminating a number of rubber plates 432 and vulcanizing them after uniformly adding reinforcing sheets 45 in the middle; the weight calculation formula of the rubber plate 432 is:

[0060] Where:

[0061] RSW = weight of the rubber plate (pounds), L = length of the rubber plate (inches), W = width of the rubber plate (inches), T = thickness of the rubber plate (inches), D = density of the rubber plate (pounds per cubic foot).

[0062] The horizontal stiffness of the buffer body 43 can be calculated using the following formula:

[0063]

[0064] K H0 = nK h0

[0065] Where: K H1 and K H2 are the shear stiffnesses of the rubber layers in different parts respectively;

[0066] G is the shear modulus of the rubber; A 1 and A 2 are the areas of the rubber layers in different parts;

[0067] t r1 and t r2 are the thicknesses of the rubber layers in different parts; n is the number of shear units.

[0068] Vertical stiffness calculation model of the buffer body 43:

[0069]

[0070] Where: K v is the vertical stiffness of the bearing;

[0071] E c1b and E c2b are the modified compression elastic moduli of the external and internal rubber layers respectively;

[0072] A 1 and A 2 are the areas of the external and internal rubber layers;

[0073] T r1 and T r2 are the total thicknesses of the external and internal rubber layers.

[0074] Mechanical property requirements:

[0075] Ultimate compressive strength R U (MPa): ≥ 70.

[0076] Measured compressive elastic modulus E 1 (MPa): E ± G × 20%.

[0077] Measured shear elastic modulus G 1 (MPa): G ± G × 15%.

[0078] Measured shear elastic modulus G after aging 2 (MPa): G + G × 15%.

[0079] Physical property requirements for rubber materials:

[0080] Hardness (IRHD): 60 ± 5.

[0081] Tensile strength (MPa): ≥17 (neoprene), ≥18 (natural rubber).

[0082] Elongation at break (%): ≥400 (neoprene), ≥450 (natural rubber).

[0083] The rubber content of the buffer body (43) is greater than or equal to 55% of the rubber mass.

[0084] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flywheel energy storage unit base, comprising a first shock-absorbing pad (21) and a second shock-absorbing pad (22), wherein the first shock-absorbing pad (21) is connected to the energy storage unit (1), and the second shock-absorbing pad (22) is connected to a mounting surface (3), characterized in that: It also comprises a buffer block (4), the buffer block (4) being arranged between the first shock-absorbing pad (21) and the second shock-absorbing pad (22), one side of the buffer block (4) being fixedly connected to the first shock-absorbing pad (21), and the other side of the buffer block (4) being fixedly connected to the second shock-absorbing pad (22).

2. A flywheel energy storage unit base as claimed in claim 1, characterized in that: The buffer block (4) comprises a first connecting plate (41), a second connecting plate (42) and a buffer body (43); the first connecting plate (41) is arranged on one side of the buffer body (43), and the second connecting plate (42) is arranged on the other side of the buffer body (43).

3. A flywheel energy storage unit base as claimed in claim 2, characterized in that: The first connecting plate (41) is fixedly connected to the first shock-absorbing pad (21), and the second connecting plate (42) is fixedly connected to the second shock-absorbing pad (22).

4. A flywheel energy storage unit base as claimed in claim 2, characterized in that: A plurality of first sealing plates (411) are provided on one side where the first connecting plate (41) is connected to the buffer body (43), and the plurality of first sealing plates (411) are all embedded in the buffer block (43); a plurality of second sealing plates (421) are provided on one side where the second connecting plate (42) is connected to the buffer body (43), and the plurality of second sealing plates (421) are all embedded in the buffer block (43).

5. A flywheel energy storage unit base as claimed in claim 2, characterized in that: The buffer block (4) further comprises a lead core (44), wherein the lead core (44) is embedded in the buffer body (43), and the lead core (44) is arranged between the first connecting plate (41) and the second connecting plate (42).

6. A flywheel energy storage unit base as claimed in claim 5, characterized in that: The buffer block (4) further comprises a reinforcing sheet (45), wherein the reinforcing sheet (45) comprises a plurality of reinforcing sheets (45), and the plurality of reinforcing sheets (45) are all embedded in the buffer body (43); the plurality of reinforcing sheets (45) are evenly distributed and arranged on both sides of the lead core (44); and the plurality of reinforcing sheets (45) are all arranged parallel to the first connecting plate (41) and the second connecting plate (42).

7. A flywheel energy storage unit base as claimed in claim 2, characterized in that: The energy storage unit (1) is connected to an energy storage base (11), the bolts sequentially pass through the energy storage base (11), the first shockproof pad (21) and the first connecting plate (41), and the other end of the bolts is matched with a first nut; and further comprises a stud, one end of which is fixedly arranged in the mounting surface (3), and the other end of the stud sequentially passes through the second shockproof pad (22) and the second connecting plate (42), and is matched with a second nut.

8. A method for installing a flywheel energy storage unit base, comprising a flywheel energy storage unit base according to any one of claims 1 to 7, characterized in that: A buffer fixing hole (431) is provided at the center of the buffer body (43), and the lead core (44) is located at one end of the buffer fixing hole (431). Pressure is applied to the lead core (44) to vertically press it into the buffer fixing hole (431).

9. A method for installing a flywheel energy storage unit base as claimed in claim 8, characterized in that: The buffer body (43) comprises a plurality of rubber plates (432) which are laminated and formed, and a reinforcing sheet (45) is uniformly added in the middle and then vulcanized and formed; the weight of the rubber plates (432) is calculated by the following formula: in: RSW = rubber sheet weight (pounds), L = rubber sheet length (inches), W = rubber sheet width (inches), T = rubber sheet thickness (inches), D = rubber sheet density (pounds / cubic foot).

10. A method for installing a flywheel energy storage unit base according to claim 9, characterized in that: The horizontal stiffness of the buffer body (43) can be calculated using the following formula: K H0 =nK h0 Where: K H1 and K H2 are the shear stiffness of the rubber layer in different parts respectively; G is the shear modulus of rubber; A1 and A2 are the areas of the rubber layer in different parts; t r1 and t r2 is the thickness of the rubber layer in different parts; n is the number of shear units. Calculation model of vertical stiffness of buffer body (43): Where: K v is the vertical stiffness of the support; E c1b and E c2b are the corrected compressive elastic modulus of the outer and inner rubber layers, respectively; A1 and A2 are the areas of the outer and inner rubber layers; T r1 and T r2 It is the total thickness of the outer and inner rubber layers. Mechanical performance requirements: Ultimate compressive strength R U (MPa):≥70. Measured compressive elastic modulus E1 (MPa): E±G×20%. Measured shear modulus G1 (MPa): G±G×15%. The measured shear elastic modulus after aging G2 (MPa): G+G×15%. Physical properties requirements of rubber materials: Hardness (IRHD): 60±5. Tensile strength (MPa): ≥17 (chloroprene rubber), ≥18 (natural rubber). Elongation at break (%): ≥400 (chloroprene rubber), ≥450 (natural rubber).

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