A new type of hydraulic shaft thrust suspension flywheel energy storage device

Abstract

The utility model relates to a novel hydraulic pressure axle thrust suspension flywheel energy storage device, it includes: main shaft, flywheel rotor, suspension pressure round bowl body, pressure increasing cylinder body, pressure increasing cavity, annular thrust bearing, annular liquid storage tank, hydraulic pump, vacuum seal jar, vacuum cavity, vacuum pump, support end sealing ring combination, power generation motor, pressure increasing cavity sealing ring, motor end sealing ring combination etc. The utility model patent compares the air suspension flywheel energy storage device and the magnetic suspension flywheel energy storage device, it simple and stable structure, the cost is lower.

Description

Technical Field

[0001] This utility model relates to the field of flywheel energy storage technology, specifically to hydraulic shaft thrust bearing technology. Background Technology

[0002] In the field of flywheel energy storage technology, magnetic levitation technology is widely used due to its high efficiency, but its complex structure and high cost limit its widespread application. Air-levitated flywheel energy storage devices significantly reduce costs compared to magnetic levitation flywheel energy storage devices, but their structure remains relatively complex. This invention simplifies the structure further by directly using a liquid as the levitation medium. Although efficiency is slightly reduced, the overall structure is simpler and more stable. Summary of the Invention

[0003] The purpose of this utility model embodiment is to provide a novel hydraulic shaft thrust levitation flywheel energy storage device, which aims to solve the problems of high cost of magnetic levitation flywheel energy storage devices and relatively complex structure of air levitation flywheel energy storage devices.

[0004] This utility model embodiment is implemented as follows: A novel hydraulic shaft thrust suspended flywheel energy storage device, characterized in that it includes a main shaft, a flywheel rotor, a suspended pressure-bearing cylindrical body, a booster cylinder, a booster chamber, an annular thrust bearing, an annular liquid storage tank, a hydraulic pump, a vacuum sealing cylinder, a vacuum chamber, a vacuum pump, a support end sealing ring assembly, a generator motor, a booster chamber sealing ring, and a motor end sealing ring assembly; the upper end of the main shaft is mounted on the upper cylinder body of the vacuum sealing cylinder via a bearing and is connected to the shaft of the generator motor, while the lower end is connected to the flywheel rotor via a key structure. The main shaft and the flywheel rotor drive each other, the main shaft can radially fix the flywheel rotor, and the flywheel rotor can move axially relative to the main shaft; the lower end of the flywheel rotor is connected to the suspended pressure-bearing cylindrical body. The suspended pressure-bearing cylindrical bowl rotates with the flywheel rotor; simultaneously, the flywheel rotor is laminated onto the annular thrust bearing at the bottom of the vacuum-sealed cylinder, without connection; the annular thrust bearing is installed on the annular support at the bottom of the vacuum-sealed cylinder, providing static support for the flywheel rotor; the suspended pressure-bearing cylindrical bowl is an inverted cylindrical bowl, its upper end connected to the flywheel rotor, and its open lower end nested on the outer side of the upper end of the booster cylinder body, without connection; the booster cylinder body is a cylindrical cylinder with an open upper end, and its lower bottom is fixedly installed on a concrete or steel plate base; the nested installation of the suspended pressure-bearing cylindrical bowl and the booster cylinder body forms a relatively sealed space inside, namely the booster chamber, which is filled with high-pressure liquid during operation; due to the suspended pressure-bearing cylindrical bowl... The bowl and the booster cylinder are nested together without connection. A ring-shaped gap is formed at the contact surface between the suspended pressure-bearing bowl and the booster cylinder. High-pressure liquid in the booster chamber can be ejected through this gap. High-pressure liquid must be continuously replenished to maintain pressure balance within the booster chamber. A booster chamber sealing ring is installed between the contact surfaces of the suspended pressure-bearing bowl and the booster cylinder, further reducing the gap and decreasing the velocity of the liquid jet through the gap. The annular storage tank is a hollow annular groove. The hollow portion of the annular storage tank can be nested on the outer side of the lower end of the booster cylinder to collect the liquid ejected from the booster chamber for recycling. The hydraulic pump is installed on the annular... At the bottom of the storage tank, its outlet conduit is inserted into the pressurization chamber to inject high-pressure liquid into the chamber. The generator motor is installed on the outer side of the upper cylinder body of the vacuum sealing cylinder, and the rotor of the generator motor is coaxially connected to the main shaft, and mutual transmission is achieved through the main shaft and the flywheel rotor. The vacuum sealing cylinder is a cylindrical structure with good sealing performance. The bottom is fixedly installed on a concrete or steel plate base by a bracket. It has an opening at both the upper and lower ends. The upper opening is the motor port, used to connect the main shaft to the motor shaft, and the lower opening is the support port, used for the flywheel rotor to pass through the vacuum sealing cylinder body and seek gravity support downward. The support port sealing ring assembly is a sealing ring assembly composed of multiple sets of sealing rings, which is used to seal the lower opening of the vacuum sealing cylinder.The motor end sealing ring assembly is used to seal the upper opening of the vacuum sealing cylinder, preventing the evaporation of lubricating oil inside the generator motor and maintaining a high vacuum level in the vacuum chamber.

[0005] The suspended pressure-bearing cylindrical bowl, the booster cylinder, the booster chamber sealing ring, the hydraulic pump, the annular liquid storage tank, and the liquid used as the suspension medium together form a hydraulic shaft thrust bearing system.

[0006] Furthermore, the generator motor is a bidirectional motor that combines the functions of an electric motor and a generator.

[0007] Furthermore, the medium used for suspending and bearing pressure within the pressurization chamber is either water or lubricating oil.

[0008] In summary, this utility model has the following beneficial effects: This utility model first achieves dynamic sealing of the pressurization chamber through liquid slit throttling, and directly replaces the gas with liquid as the medium for suspension and pressure bearing, making the suspension structure simpler and more stable. Attached Figure Description

[0009] Figure 1 A schematic diagram of a hydraulic shaft thrust-driven suspended flywheel energy storage device; Figure 2 This is a schematic diagram of a circular liquid storage tank. Figure 3 This is a partial structural diagram of a hydraulic shaft thrust bearing system.

[0010] In the diagram: 1-Main shaft, 2-Flywheel rotor, 3-Suspension pressure-bearing cylindrical bowl, 4-Pressure booster cylinder, 5-Pressure booster chamber, 6-Annular thrust bearing, 7-Annular liquid storage tank, 8-Hydraulic pump, 9-Vacuum sealing cylinder, 10-Vacuum chamber, 11-Vacuum pump, 12-Support end sealing ring assembly, 13-Generator motor, 14-Pressure booster chamber sealing ring, 15-Motor end sealing ring assembly. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. The specific implementation of the present utility model will be described in detail below with reference to specific embodiments. Example

[0012] like Figure 1 and Figure 2As shown: A novel hydraulic shaft thrust suspension flywheel energy storage device, characterized in that it includes a main shaft 1, a flywheel rotor 2, a suspension pressure-bearing cylindrical body 3, a pressure-boosting cylinder 4, a pressure-boosting chamber 5, an annular thrust bearing 6, an annular liquid storage tank 7, a hydraulic pump 8, a vacuum sealing cylinder 9, a vacuum chamber 10, a vacuum pump 11, a support end sealing ring assembly 12, a generator motor 13, a pressure-boosting chamber sealing ring 14, and a motor end sealing ring assembly 15; the upper end of the main shaft 1 is mounted on the upper cylinder body of the vacuum sealing cylinder 9 via a bearing and is connected to the shaft of the generator motor 13, and the lower end is connected to the flywheel rotor 2 via a key structure. The main shaft 1 and the flywheel rotor 2 drive each other, the main shaft 1 can radially fix the flywheel rotor 2, and the flywheel rotor 2 can move axially relative to the main shaft 1; the flywheel rotor 2. The lower end is connected to the suspended pressure-bearing cylindrical bowl 3, which rotates with the flywheel rotor 2. Simultaneously, the flywheel rotor 2 is laminated onto the annular thrust bearing 6 at the bottom of the vacuum sealing cylinder 9, without connection. The annular thrust bearing 6 is installed on an annular support at the bottom of the vacuum sealing cylinder 9, providing static support for the flywheel rotor 2. The suspended pressure-bearing cylindrical bowl 3 is an inverted cylindrical bowl, its upper end connected to the flywheel rotor 2, and its open lower end nested on the outer side of the upper end of the pressure-boosting cylinder 4, without connection. The pressure-boosting cylinder 4 is an open cylindrical cylinder, its lower bottom fixedly installed on a concrete or steel plate base. The nested installation of the suspended pressure-bearing cylindrical bowl 3 and the pressure-boosting cylinder 4 forms a relatively sealed space inside, i.e., a pressure-boosting chamber. 5. During operation, the pressurization chamber 5 is filled with high-pressure liquid. Due to the nested installation of the suspended pressure-bearing cylindrical bowl 3 and the pressurization cylinder 4 without connection, an annular gap is formed at the contact surface of the suspended pressure-bearing cylindrical bowl 3 and the pressurization cylinder 4. The high-pressure liquid in the pressurization chamber 5 can be ejected through the annular gap. High-pressure liquid must be continuously replenished into the pressurization chamber 5 to maintain the liquid pressure balance within the pressurization chamber 5. The pressurization chamber sealing ring 14 is installed between the contact surfaces of the suspended pressure-bearing cylindrical bowl 3 and the pressurization cylinder 4. The pressurization chamber sealing ring 14 further reduces the contact gap between the suspended pressure-bearing cylindrical bowl 3 and the pressurization cylinder 4, reducing the liquid jet velocity through the gap. The annular liquid storage tank 7 is a hollow annular groove. The hollow part of the annular liquid storage tank 7 can be nested and installed outside the lower end of the pressurization cylinder 4. The side is used to collect the liquid ejected from the pressurization chamber 5 for recycling; the hydraulic pump 8 is installed at the bottom of the annular liquid storage tank 7, and its outlet pipe is inserted into the pressurization chamber 5 to inject high-pressure liquid into the pressurization chamber 5; the generator motor 13 is installed on the outer side of the upper cylinder body of the vacuum sealing cylinder 9, and the rotor of the generator motor 13 is coaxially connected to the main shaft 1, and mutual transmission is achieved through the main shaft 1 and the flywheel rotor 2; the vacuum sealing cylinder 9 is a cylindrical structure with good sealing performance, and the bottom is fixedly installed on a concrete or steel plate base by a bracket. It has an opening at both the upper and lower ends. The upper opening is the motor port, which is used to connect the main shaft 1 to the motor shaft, and the lower opening is the support port, which is used for the flywheel rotor 2 to pass through the cylinder body of the vacuum sealing cylinder 9 to seek gravity support downward;The support port sealing ring assembly 12 is a sealing ring assembly composed of multiple sealing rings, used to seal the lower opening of the vacuum sealing cylinder 9; the motor end sealing ring assembly 15 is used to seal the upper opening of the vacuum sealing cylinder 9, to prevent the evaporation of lubricating oil in the generator motor 13, and to maintain the high vacuum level of the vacuum chamber 10.

[0013] The suspended pressure-bearing cylindrical bowl 3, the booster cylinder 4, the booster chamber sealing ring 14, the hydraulic pump 8, the annular liquid storage tank 7, and the liquid used as the suspension medium together form a hydraulic shaft thrust bearing system.

[0014] Furthermore, the generator motor 13 is a bidirectional motor that combines the functions of an electric motor and a generator.

[0015] Furthermore, the medium used for suspending and bearing pressure in the pressurization chamber 5 is one of liquids such as water or lubricating oil.

[0016] Its main working principle is as follows: When energy storage is needed, the generator motor 13 drives the flywheel rotor 2 to rotate through the main shaft 1, continuously accelerating the flywheel rotor 2 until it reaches the critical speed it can withstand. At this point, electrical energy is converted into kinetic energy and stored. When power generation is needed, the rotational inertia of the flywheel rotor 2 drives the generator motor 13 to generate electricity through the main shaft 1 until the speed of the flywheel rotor 2 drops to zero. At this point, kinetic energy is converted into electrical energy again.

[0017] The workflow is: Before operation, start the hydraulic pump 8 to increase the liquid pressure in the booster chamber 5. When the pressure increases to a certain critical value, its upward thrust will push the suspended pressure-bearing cylindrical body 3 and the flywheel rotor 2 upward along the axis. The flywheel rotor 2 and the suspended pressure-bearing cylindrical body 3 gradually separate from the annular thrust bearing 6 and suspend. The hydraulic pump 8 continues to run to maintain the liquid pressure in the booster chamber 5.

[0018] Step 1: Start vacuum pump 11 to evacuate vacuum chamber 10 to a high vacuum state.

[0019] Step 2: Start the motor function of generator motor 13 to accelerate flywheel rotor 2. The speed of flywheel rotor 2 is controlled as needed to be below the critical speed that flywheel rotor 2 can withstand. This process completes the charging process, and electrical energy is converted into kinetic energy and stored.

[0020] The flywheel rotor 2 is connected to the suspended pressure-bearing cylindrical bowl 3 and rotates at high speed. It has no actual physical connection with the booster cylinder 4. At this time, the high-speed rotating flywheel rotor 2 and the suspended pressure-bearing cylindrical bowl 3 are suspended above the high-pressure liquid in the booster chamber 5.

[0021] Step 3: Start the generator function of generator motor 13. The flywheel rotor 2 uses its rotational inertia to drive the generator rotor of generator motor 13 to rotate, continuously completing the power output. This process completes the power generation process, and kinetic energy is converted into electrical energy and output.

[0022] We will now illustrate this with two more specific examples.

[0023] Example 1: The flywheel rotor is a cylinder made of high-strength steel with a mass of 100t, a density of 7.8t / m³, a radius of 2m, and a height of 1.02m. The calculated surface area of ​​the cylinder is 37.93㎡. Assuming the maximum operating speed of the flywheel rotor is 25r / s, the calculated maximum linear velocity of the flywheel rotor is 314m / s. Assuming the maximum working pressure of the pressurization chamber is 50MPa, calculations show that to maintain the suspension of the suspended pressure-bearing cylindrical bowl, the internal diameter of the suspended pressure-bearing cylindrical bowl is designed to be 0.158m, and the radius is 0.079m. The calculated maximum rotational linear velocity of the inner wall of the suspended pressure-bearing cylindrical bowl is 12.4m / s. Assuming the liquid used for suspension and pressure bearing in the pressurization chamber is water, and the viscosity of water is η=1.0×10^-3 Pa·s. The gap width between the lower inner wall of the suspended pressure-bearing cylindrical bowl and the upper outer wall of the booster cylinder is set to 10 μm, and the contact length between the lower inner wall of the suspended pressure-bearing cylindrical bowl and the upper outer wall of the booster cylinder is set to 0.1 m.

[0024] If the charging and discharging cycle is 24 hours, we will evaluate the value of this utility model by calculating its working efficiency.

[0025] 1. First calculate the kinetic energy of the rotor. The kinetic energy of the cylindrical rotor is Ek = ½Iω² = ¼mv² = ¼ * 100000 * 314 * 314 ≈ 2.465 * 10^10 J ≈ 685 kW.h.

[0026] 2. Calculate the power consumption over 24 hours of charging and discharging. The power consumption mainly comes from three aspects: ① the viscous resistance of the inner wall of the cylinder when the suspended pressure-bearing cylindrical body rotates, which causes power consumption; ② the power consumption required to maintain the high pressure of the pressurization chamber and replenish the high pressure liquid; ③ the power consumption generated by the viscous resistance of the liquid at the contact surface between the inner wall of the lower end of the suspended pressure-bearing cylindrical body and the outer wall of the upper end of the pressurization cylinder when the rotor rotates.

[0027] (1) Calculate the power consumption caused by the viscous resistance of the inner wall of the suspended pressure-bearing cylindrical bowl. Assume the water boundary layer thickness is 0.001m (the distance the velocity changes from the surface of the cylinder to zero), and take h=0.001; assume the top of the inner wall of the suspended pressure-bearing cylindrical vessel is a hemispherical dome with an area A=2πr²=2*3.14*0.079²≈0.5㎡; velocity v=12.4m / s.

[0028] Substituting the formula for viscous resistance, Fviscous = μAv / h, into the calculation: Fviscous = 0.001 × 0.5 × 12.4 / 0.001 = 6.4 N, power consumption = 6.4 * 12.4 = 79.36 W. 24-hour power consumption = 79.36 * 24 = 1904.64 Wh ≈ 1.9 kW·h.

[0029] (2) Calculate the power consumption required to maintain the high pressure in the pressurization chamber and replenish the high pressure liquid. First, calculate the energy required to replenish 1 cubic meter of liquid under a pressure of 50 MPa: W=P*V=50MPa*1m³=5*10^7J≈13.89kw.h.

[0030] The width of the slit between the lower inner wall of the suspended pressure-bearing cylindrical body and the upper outer wall of the booster cylinder is approximately 0.158 * 3.14 = 0.5 m, the height of the slit is 0.00001 m, and the length of the slit is 0.1 m. Using the parallel plate flow formula under laminar flow conditions, the average flow velocity of the liquid flowing out of the booster chamber through the slit is calculated to be 4.16 m / s.

[0031] The volume of water ejected through the gap between the lower inner wall of the suspended pressure-bearing cylindrical body and the upper outer wall of the booster cylinder within 24 hours is approximately 1.8 m³ (0.5 * 0.00001 m * 4.16 * 3600 * 24). The power consumption required to maintain the high pressure in the booster chamber and replenish the high-pressure liquid is approximately 25 kWh (13.89 * 1.8).

[0032] (3) Calculate the power consumption generated by the liquid viscous resistance at the contact surface between the inner wall of the lower end of the suspended pressure-bearing cylindrical body and the outer wall of the upper end of the booster cylinder. The contact area between the lower inner wall of the floating pressure bowl and the upper outer wall of the booster cylinder is A = 0.158 * 3.14 * 0.1 ≈ 0.05 m². Since the gap width is 0.00001 m, h = 0.00001 is taken when calculating the velocity gradient.

[0033] Viscous resistance Fviscous = 1.0 × 10^-3 × 0.05 × 12.4 / 0.00001 ≈ 62 N, viscous power consumption in 24 hours W = 62 * 12.4 * 24 ≈ 1.845 * 10^5 w.h = 18.45 kw.h.

[0034] Total: Maximum total power consumption over 24-hour charge-discharge cycle = 1.9 + 25 + 18.45 = 45.35 kWh, which accounts for approximately 6.6% of the total energy storage of 685 kWh. That is, the 24-hour charge-discharge efficiency is 93.4% (since the flywheel rotor in this case operates in a vacuum environment, the viscous power consumption of the rotor is not considered in this calculation).

[0035] Example 2: The flywheel rotor is a cylinder made of high-strength steel with a mass of 4000t, a density of 7.8t / m³, and a radius of 5m. Calculations show its height is 6.53m and its surface area is 362㎡. Assuming the flywheel rotor's maximum operating speed is 10r / s, the calculated maximum linear velocity is 314m / s. Assuming the maximum working pressure of the pressurization chamber is 50MPa, calculations show that to maintain the suspension of the pressure-bearing cylindrical container, the internal diameter is designed to be 1m and the radius 0.5m. The calculated maximum rotational linear velocity of the inner wall of the cylinder is 31.4m / s. Assuming the liquid used for suspension and pressure bearing in the pressurization chamber is water, and the viscosity of water is η = 1.0 × 10⁻³ Pa·s. The gap width between the lower inner wall of the suspended pressure-bearing cylindrical bowl and the upper outer wall of the booster cylinder is set to 10 μm, and the contact length between the lower inner wall of the suspended pressure-bearing cylindrical bowl and the upper outer wall of the booster cylinder is set to 0.05 m.

[0036] If the charge-discharge cycle is 24 hours, we will evaluate the value of this utility model by calculating its working efficiency.

[0037] 1. First calculate the kinetic energy of the rotor. The kinetic energy of the cylinder is Ek = ½Iω² = ¼mv² = ¼ * 4000000 * 314 * 314 ≈ 9.86 * 10^10 J ≈ 27389 kw.h.

[0038] 2. Calculate the power consumption over 24 hours of charging and discharging. The power consumption mainly comes from three aspects: ① the viscous resistance of the inner wall of the cylinder when the suspended pressure-bearing cylindrical body rotates, which causes power consumption; ② the power consumption required to maintain the high pressure of the pressurization chamber and replenish the high pressure liquid; ③ the power consumption generated by the viscous resistance of the liquid at the contact surface between the inner wall of the lower end of the suspended pressure-bearing cylindrical body and the outer wall of the upper end of the pressurization cylinder when the rotor rotates.

[0039] (1) Calculate the power consumption caused by the viscous resistance of the inner wall of the suspended pressure-bearing cylindrical bowl. Assuming a boundary layer thickness of 0.001m (the distance the velocity changes from the surface of the cylinder to zero), h=0.001, and the top of the inner wall of the suspended pressure-bearing cylindrical vessel is a hemispherical dome with an area A=2πr²=2*3.14*0.5²=1.57㎡; velocity v=31.4m / s.

[0040] Viscous resistance Fviscous = 0.001 × 1.57 × 31.4 / 0.001 ≈ 49.3 N, power consumption = 49.3 * 31.4 ≈ 1548 W, 24-hour power consumption = 1548 * 24 = 37152 W.h ≈ 37.15 kWh.

[0041] (2) Calculate the power consumption required to maintain the high pressure in the pressurization chamber and replenish the high pressure liquid. The width of the slit between the lower inner wall of the suspended pressure-bearing cylindrical body and the upper outer wall of the booster cylinder is 1 * 3.14 = 3.14 m, the height of the slit is 0.00001 m, and the length of the slit is 0.05 m. Using the parallel plate flow formula under laminar flow conditions, the average flow velocity of the liquid flowing out of the booster chamber through the slit is calculated to be 8.33 m / s.

[0042] The volume of water ejected through the gap between the lower inner wall of the suspended pressure-bearing cylindrical body and the upper outer wall of the booster cylinder within 24 hours is approximately 22.6 m³ (3.14 * 0.00001 m * 8.33 * 3600 * 24). The power consumption required to maintain the high pressure in the booster chamber and replenish the high-pressure liquid is approximately 313.9 kWh (13.89 * 22.6).

[0043] (3) Calculate the power consumption generated by the liquid viscous resistance at the contact surface between the inner wall of the lower end of the suspended pressure-bearing cylindrical body and the outer wall of the upper end of the booster cylinder. The contact area between the lower inner wall of the floating pressure-bearing cylindrical bowl and the upper outer wall of the booster cylinder is A = 1 * 3.14 * 0.05 = 0.157 m², the gap width is 0.00001 m, and we take h = 0.00001.

[0044] Viscous resistance Fviscous = 1.0 × 10^-3 × 0.157 × 31.4 / 0.00001 ≈ 493 N, viscous power consumption in 24 hours W = 493 * 31.4 * 24 ≈ 3.72 * 10^5 W.h = 372 kW.h.

[0045] The maximum total power consumption during a 24-hour charge-discharge cycle is 37.15 + 313.9 + 372 = 723.05 kWh, which accounts for approximately 2.6% of the total energy storage of 27389 kWh. The 24-hour charge-discharge efficiency is 97.4%.

[0046] Experimental data from Examples 1 and 2 show that, under the same conditions, the greater the rotor mass, the smaller the rotational speed required to maintain the same linear velocity, and thus the higher the efficiency of this invention.

[0047] We further compare this utility model patent with a flywheel energy storage device that uses a common deep groove ball bearing. Assuming that the inner diameter of the deep groove ball bearing and the inner diameter of the suspended pressure-bearing cylindrical bowl are both 1m, the linear velocity of the bearing when the flywheel rotor rotates is also 31.4m. Assuming that the bearing adopts good rolling lubrication conditions and the rolling friction efficiency is 0.001, the rotational resistance of the bearing = 4000 * 9800 * 0.001 = 39200N, the power consumption of the bearing = 39200 * 31.4 ≈ 1.23 * 10^6 W, and the power consumption in 24 hours is 1.23 * 10^6 * 24 ≈ 2.95 * 10^7 W * h = 29500 kW * h. This power consumption is sufficient to exhaust all the stored energy.

[0048] To increase the service life of the pressure-bearing cylindrical bowl, a replaceable inner liner can be added to the inner wall at the lower end of the pressure-bearing cylindrical bowl so that it can be replaced in time after wear.

[0049] This invention is very suitable for distribution and storage applications in daily regulation scenarios such as photovoltaic and wind power generation. At the same time, this invention can also be widely used in other application scenarios such as subways, high-speed railways, and power grid frequency regulation, and has a very broad application prospect.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel hydraulic shaft thrust-driven suspended flywheel energy storage device, characterized in that: The system includes a main shaft (1), a flywheel rotor (2), a suspended pressure-bearing cylindrical bowl (3), a booster cylinder (4), a booster chamber (5), an annular thrust bearing (6), an annular liquid storage tank (7), a hydraulic pump (8), a vacuum sealing cylinder (9), a vacuum chamber (10), a vacuum pump (11), a support end sealing ring assembly (12), a generator motor (13), a booster chamber sealing ring (14), and a motor end sealing ring assembly (15). The upper end of the main shaft (1) is mounted on the upper cylinder of the vacuum sealing cylinder (9) via a bearing and is connected to the shaft of the generator motor (13). The lower end is connected to the flywheel rotor (2) via a key structure. The main shaft (1) and the flywheel rotor (2) drive each other. The main shaft (1) can radially fix the flywheel rotor (2). The flywheel rotor (2) can move axially relative to the main shaft (1); the lower end of the flywheel rotor (2) is connected to the suspended pressure-bearing cylindrical bowl (3), and the suspended pressure-bearing cylindrical bowl (3) rotates with the flywheel rotor (2); at the same time, the flywheel rotor (2) is laminated on the annular thrust bearing (6) at the bottom of the vacuum sealing cylinder (9), without connection; the annular thrust bearing (6) is installed on the annular support at the bottom of the vacuum sealing cylinder (9), and the annular thrust bearing (6) provides static support for the flywheel rotor (2); the suspended pressure-bearing cylindrical bowl (3) is an inverted cylindrical bowl, the upper end of which is connected to the flywheel rotor (2), and the lower end of the opening is nested on the outer side of the upper end of the booster cylinder (4), without connection; the booster cylinder (4) is a cylindrical cylinder with an opening at the upper end, and the lower bottom of the booster cylinder (4) is fixed. The suspended pressure-bearing cylindrical bowl (3) and the pressure-boosting cylinder (4) are nested together to form a relatively sealed space, namely the pressure-boosting chamber (5), which is filled with high-pressure liquid during operation. Due to the nested installation of the suspended pressure-bearing cylindrical bowl (3) and the pressure-boosting cylinder (4), there is no connection between them. A ring-shaped gap is formed on the mating surface of the suspended pressure-bearing cylindrical bowl (3) and the pressure-boosting cylinder (4). The high-pressure liquid in the pressure-boosting chamber (5) can be ejected through the ring-shaped gap. High-pressure liquid must be continuously added to the pressure-boosting chamber (5) to maintain the liquid pressure balance in the pressure-boosting chamber (5). The pressure-boosting chamber sealing ring (14) is installed between the mating surfaces of the suspended pressure-bearing cylindrical bowl (3) and the pressure-boosting cylinder (4). Further reduce the gap between the suspended pressure-bearing cylindrical bowl (3) and the booster cylinder (4) to reduce the liquid jet velocity through the gap; the annular storage tank (7) is a hollow annular tank, and the hollow part of the annular storage tank (7) can be nested and installed on the outer side of the lower end of the booster cylinder (4) to collect the liquid ejected from the booster chamber (5) for recycling; the hydraulic pump (8) is installed at the bottom of the annular storage tank (7), and its outlet pipe is inserted into the booster chamber (5) to inject high-pressure liquid into the booster chamber (5); the generator motor (13) is installed on the outer side of the upper cylinder of the vacuum sealing cylinder (9), and the rotor of the generator motor (13) is coaxially connected with the main shaft (1) and mutually driven by the main shaft (1) and the flywheel rotor (2);The vacuum sealing cylinder (9) is a sealed cylindrical structure. Its bottom is fixed to a concrete or steel plate base via a bracket. It has an opening at both the top and bottom. The top opening is the motor port, used to connect the main shaft (1) to the motor shaft. The bottom opening is the support port, used for the flywheel rotor (2) to pass through the vacuum sealing cylinder (9) and seek gravity support downwards. The support port sealing ring assembly (12) is a sealing ring assembly composed of multiple sets of sealing rings, used to seal the bottom opening of the vacuum sealing cylinder (9). The motor end sealing ring assembly (15) is used to seal the top opening of the vacuum sealing cylinder (9), preventing the evaporation of lubricating oil from the generator motor (13) and maintaining a high vacuum in the vacuum chamber (10).

2. The novel hydraulic shaft thrust suspended flywheel energy storage device according to claim 1, characterized in that: The suspended pressure-bearing cylindrical bowl (3), the booster cylinder (4), the booster chamber sealing ring (14), the hydraulic pump (8), the annular liquid storage tank (7), and the liquid used for the suspension medium together form a hydraulic shaft thrust bearing system.

3. The novel hydraulic shaft thrust suspended flywheel energy storage device according to claim 2, characterized in that: The generator motor (13) is a bidirectional motor that combines a motor and a generator.

4. The novel hydraulic shaft thrust suspended flywheel energy storage device according to claim 3, characterized in that: The medium used for suspending and bearing pressure in the pressurization chamber (5) is either water or lubricating oil.

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