Energy storage flywheel

Abstract

An energy storage flywheel comprises a shell, a rotor, a stator and a bearing. The rotor is arranged in the shell and comprises a flywheel rotor, an upper-end radial magnetic bearing rotor, a motor rotor and a lower-end radial magnetic bearing rotor, and the flywheel rotor, the upper-end radial magnetic bearing rotor, the motor rotor and the lower-end radial magnetic bearing rotor are of an integrated structure; the stator is fixedly arranged on the shell; the bearing is arranged in a gap between the rotor and the shell; by increasing the mass of the rotor, the magnetic force generated between the bearing and the stator is increased, and the magnetic force between the stator and the rotor is also increased, so that the generated electric power is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to an energy storage flywheel. Background Art

[0002] As a new type of energy storage, energy storage flywheels are becoming more and more well-known and recognized by the market. The breadth and depth of applications are constantly accelerating, and the total power is gradually developing rapidly towards tens of megawatts and hundreds of megawatts, and the total storage capacity is also growing synchronously from hundreds of kilovolt-amperes to thousands of kilovolt-amperes. The solution adopted is to use multiple flywheels in parallel. The maximum power of a single flywheel on the market is 250 kilowatts, and the maximum storage energy is 50 kilovolt-amperes. To achieve the total power demand of tens of megawatts and hundreds of megawatts, the number of flywheels required to be connected in parallel is hundreds, which requires a large installation space and a low space energy density, increasing the intensity of construction and energy storage costs.

[0003] The flywheel rotor of conventional energy storage flywheels currently on the market has a small mass and generates relatively little electrical power. Utility Model Content

[0004] In order to solve the problem that the flywheel rotor of the existing conventional energy storage flywheel has a small mass and generates small electric power, the utility model provides an energy storage flywheel.

[0005] An energy storage flywheel, characterized in that it comprises a housing, a rotor, a stator and a bearing;

[0006] The shell is a hollow shell;

[0007] The rotor is arranged inside the housing, and there is a gap between the rotor and the housing;

[0008] The rotor comprises a flywheel rotor, an upper radial magnetic bearing rotor, a motor rotor and a lower radial magnetic bearing rotor, wherein the upper radial magnetic bearing rotor is sleeved on the outer side of the upper extension portion of the flywheel rotor; the motor rotor and the lower radial magnetic bearing rotor are both sleeved on the outer side of the downward extension portion of the flywheel rotor, and the motor rotor is above the lower radial magnetic bearing rotor;

[0009] The stator is fixedly arranged on the housing;

[0010] The bearing is disposed in a gap between the rotor and the housing;

[0011] The flywheel rotor, the upper radial magnetic bearing rotor, the motor rotor and the lower radial magnetic bearing rotor are coaxial and are an integrated structure. The mass of the rotor is more than ten tons and is a fully suspended type.

[0012] According to one aspect of the present application, the flywheel rotor is in the shape of a Chinese character 'zhong', the middle part of the flywheel rotor is cylindrical, and the shape of the outer shell corresponds to that of the flywheel rotor;

[0013] The flywheel rotor extends upward to form an upper extension part, and the upper extension part of the flywheel rotor is that the center of the upper surface of the middle part of the flywheel rotor extends upward to a preset distance;

[0014] The lower extension part of the flywheel rotor is that the center of the lower surface of the middle part of the flywheel rotor extends downward to a preset distance, and both the upper extension part and the lower extension part are cylindrical.

[0015] According to one aspect of the present application, the stator is arranged outside the rotor and has a preset distance from the outside of the rotor.

[0016] According to one aspect of the present application, a vacuum pumping port is provided in the middle of the outer shell, and the vacuum pumping port penetrates the outer shell.

[0017] According to one aspect of the present application, an electrode is provided at the upper part of the lower part of the outer shell, the electrode penetrates one side of the outer shell, and is connected to the stator.

[0018] According to one aspect of the present application, the bearing includes an upper mechanical protection bearing, an axial magnetic bearing, and a lower mechanical protection bearing. The upper mechanical protection bearing is arranged above the upper radial magnetic bearing rotor and has a preset distance from the upper radial magnetic bearing rotor; the lower mechanical protection bearing is arranged below the lower radial magnetic bearing rotor and has a preset distance from the lower radial magnetic bearing rotor; the axial magnetic bearing is fixedly arranged above the middle part of the flywheel rotor.

[0019] According to one aspect of the present application, the stator includes an upper radial magnetic bearing stator, a motor stator, and a lower radial magnetic bearing stator, and the input end of the electrode is connected to the output end of the electrode stator.

[0020] According to one aspect of the present application, the upper radial magnetic bearing formed by the upper radial magnetic bearing rotor and the upper radial magnetic bearing stator is a mechanical working bearing; the lower magnetic bearing formed by the lower radial magnetic bearing rotor and the lower mechanical protection bearing is a mechanical working bearing.

[0021] According to one aspect of the present application, the outer shell includes an upper sealing cover, an upper housing, an upper cover, a housing, a lower cover, a lower housing, and a lower sealing cover;

[0022] The lower surface of the upper end sealing cover abuts against the upper surface of the upper end shell, the lower surface of the upper end shell abuts against the upper surface of the upper end cover, the lower surface of the upper end cover abuts against the lower surface of the shell, the upper surface of the shell abuts against the upper surface of the lower end cover, the lower surface of the lower end cover abuts against the upper surface of the lower end shell, and the lower surface of the lower end shell abuts against the upper surface of the lower end sealing cover;

[0023] An opening is provided below the shell, and an inner wall of the opening is connected to the lower extension portion of the flywheel rotor.

[0024] The beneficial effects of the utility model are as follows: by increasing the mass of the rotor, which is more than ten tons, the magnetic force generated between the bearing and the stator is increased, and the magnetic force between the stator and the rotor is also increased, and the electric power generated by the utility model is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a specific structural schematic diagram of an energy storage flywheel of the utility model. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as a limitation on the present invention.

[0028] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "join", "hinge" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example 1

[0032] A storage energy flywheel comprises a shell 20, a rotor, a stator, a bearing, a vacuum port 7 and an electrode 11; the shell 20 comprises an upper sealing cover 1, an upper shell 3, an upper cover 5, a shell 8, a lower cover 10, a lower shell 16 and a lower sealing cover 15; the rotor comprises a flywheel rotor 9, an upper radial magnetic bearing rotor 19, a motor rotor 17 and a lower radial magnetic bearing rotor 18; the stator comprises an upper radial magnetic bearing stator 4, a motor stator 12 and a lower radial magnetic bearing stator 13; the bearing comprises an upper mechanical protection bearing 2, an axial magnetic bearing 6 and a lower mechanical protection bearing 14.

[0033] Among them, the upper sealing cover 1 and the lower sealing cover 15 are used to seal the two ends of the energy storage flywheel; the upper mechanical protection bearing 2 and the lower mechanical protection bearing 14 are used as an additional auxiliary protection for the radial magnetic bearing; the axial magnetic bearing 6, the upper radial magnetic bearing stator 4 and the lower radial magnetic bearing stator 13 are used to generate magnetic force by energizing together; the motor rotor 17, the lower radial magnetic bearing rotor 18 and the upper radial magnetic bearing rotor 19 are used to combine the rotor into an integrated rotor to enhance suspension; the electrode 11 is used to input electricity; the electrode stator 12 is used to generate induced electromotive force.

[0034] The rotor is arranged inside the housing 20. Figure 1 As shown, there is a gap between the rotor and the housing 20 .

[0035] The flywheel rotor 9 is a herringbone structure. Figure 1As shown, the middle part of the flywheel rotor 9 is cylindrical, the center of the circle above the middle part of the flywheel rotor 9 extends upward to a preset distance to form an upper extension; the center of the circle below the middle part of the flywheel rotor 9 extends downward to a preset distance to form a lower extension; so that the flywheel rotor 9 is a Chinese-shaped structure. The shape of the housing 20 corresponds to the shape of the flywheel rotor 9 and is also Chinese-shaped.

[0036] The upper end sealing cover 1 is arranged at the upper end of the upper extension of the flywheel rotor 9. Figure 1 As shown, the upper end sealing cover 1 is circular, and the upper end sealing cover 1 is fixedly arranged at the upper end of the upper extension of the flywheel rotor 9, and has a certain distance from the upper end of the upper extension of the flywheel rotor 9. The upper end sealing cover 1 ensures that the energy storage flywheel is continuously maintained in a vacuum state; the upper end housing 3 is arranged below the upper end sealing cover 1, as shown in FIG. Figure 1 As shown, the top of the upper shell 3 is in contact with the bottom of the upper sealing cover 1, and the upper shell 3 is a convex shape with upper and lower hollows. The upper shell 3 is arranged on the outer periphery of the upper extension portion of the flywheel rotor 9, and there is a certain distance between the inner periphery of the upper shell 3 and the upper extension portion of the flywheel rotor 9.

[0037] The upper end cover 5 is a hollow cylindrical shape. Figure 1 As shown, the upper surface of the upper end cover 5 abuts against the lower surface of the upper end shell 3, and the hollow structure of the upper end cover 5 communicates with the hollow structure of the upper end shell 3. The upper end cover 5 is arranged on the outer periphery of the lower part of the upper extension of the flywheel rotor 9, and the inner periphery of the upper end cover 5 is a certain distance from the upper extension of the flywheel rotor 9; the shell 8 is arranged below the upper end cover 5, as shown in FIG. Figure 1 As shown, the shell 8 is a hollow structure and is arranged on the outer periphery of the middle part of the flywheel rotor 9. There is a certain gap between the shell 8 and the middle part of the flywheel rotor 9, and an opening is opened at the bottom of the shell 8, and the opening is connected to the upper part of the lower extension part of the flywheel rotor 9.

[0038] The lower end cover 10 is arranged below the housing 8. Figure 1As shown, the upper surface of the lower end cover 10 abuts against the lower surface of the shell 8, the lower end cover 10 is a hollow cylindrical shape, the lower end cover 10 is arranged at the upper part of the lower extension of the flywheel rotor 9, and there is a gap between the lower end cover 10 and the lower extension of the flywheel rotor 9; the lower end shell 16 is arranged below the lower end cover 10, the lower end shell 16 is an inverted convex shape, and the lower end shell 16 is arranged on the outer periphery of the lower extension of the flywheel rotor 9, the upper surface of the lower end shell 16 abuts against the lower surface of the lower end cover 10, and there is a certain distance between the lower end shell 16 and the lower extension of the flywheel rotor 9; the lower end sealing cover 15 is fixedly arranged at the lower end of the lower extension of the flywheel rotor 9, as shown in FIG. Figure 1 As shown, the lower sealing cover 15 is circular and has the same size as the upper sealing cover 1 . The lower sealing cover 15 abuts against the lower shell 16 . The lower sealing cover 15 is at a certain distance from the lower end of the lower extension of the flywheel rotor 9 .

[0039] The upper mechanical protection bearing 2 is fixedly arranged at the upper part of the upper extension of the flywheel rotor 9 for additional auxiliary protection to ensure the stability of the integrated rotor. Figure 1 As shown, the upper mechanical protection bearing 2 is fixedly arranged at an upper position of the upper extension part of the flywheel rotor 9, and is a certain distance away from the upper end of the upper extension part of the flywheel rotor 9. The upper mechanical protection bearing 2 is fixedly arranged in the gap between the upper shell 3 and the flywheel rotor 9, and the inner peripheral side of the upper mechanical protection bearing 2 is connected to the outer peripheral side of the upper extension part of the flywheel rotor 9, and the outer peripheral side of the upper mechanical protection bearing 2 is connected to the inner peripheral side of the upper shell 3.

[0040] The upper radial magnetic bearing stator 4 is fixedly arranged at the middle and lower part of the upper housing 3, and the upper radial magnetic bearing stator 4 is used to generate magnetic force when energized. Figure 1 As shown, the upper radial magnetic bearing stator 4 is arranged below the upper mechanical protection bearing 2, and a groove is opened in the middle and lower part of the inner circumference of the upper shell 3 for placing the upper radial magnetic bearing stator 4, half of the upper radial magnetic bearing stator 4 is arranged inside the upper shell 3, and half of the upper radial magnetic bearing stator 4 is arranged in the gap between the upper shell 3 and the flywheel rotor 9; the upper radial magnetic bearing rotor 19 is arranged in the middle position of the upper extension part of the flywheel rotor 9, and is arranged corresponding to the upper radial magnetic bearing stator 4, as shown Figure 1As shown, at the same height as the upper radial magnetic bearing stator 4, the inner circumference of the upper radial magnetic bearing rotor 19 is connected to the outer circumference of the upper extension portion of the flywheel rotor 9, and the upper radial magnetic bearing rotor 19 is integrated with the flywheel rotor 9, and there is a certain gap between the outer circumference of the upper radial magnetic bearing rotor 19 and the inner circumference of the upper radial magnetic bearing stator 4.

[0041] The axial magnetic bearing 6 is fixedly arranged on the upper end cover 5. Figure 1 As shown, a groove is opened below the upper end cover 5 for fixing the axial magnetic bearing 6, half of the axial magnetic bearing 6 is arranged inside the upper end cover 5, and the other half of the axial magnetic bearing 6 is arranged in the gap between the upper end cover 5 and the flywheel rotor 9, and there is a certain gap between the axial magnetic bearing 6 and the flywheel rotor 9.

[0042] The vacuum port 7 is arranged in the middle part of the housing 8. Figure 1 As shown, the vacuum port 7 runs through the shell 8 and is used to extract the air in the shell to keep the energy storage flywheel in a vacuum state.

[0043] The motor stator 12 is fixedly arranged on the upper part of the lower end housing 16. Figure 1 As shown, a slot is provided in the inner upper part of the lower end housing 16, half of the motor stator 12 is arranged in the lower end housing 16, and half of the motor stator 12 is arranged in the gap between the lower end housing 16 and the flywheel rotor 9; the motor rotor 17 is arranged at the upper part of the lower extension of the flywheel rotor 9, and is arranged corresponding to the motor stator 12, as shown in FIG. Figure 1 As shown, and at the same horizontal height as the motor stator 12, the inner peripheral side of the motor rotor 17 is connected to the outer peripheral side of the lower part of the flywheel rotor 9, and there is a certain gap between the motor rotor 17 and the motor stator 12, and the motor stator 12 and the flywheel rotor 9 are integrated.

[0044] The electrode 11 is arranged on the upper part of the lower end shell 16. Figure 1 As shown, the electrode 11 passes through the lower end shell 16 , and the input end of the electrode 11 is connected to the output end of the motor stator 12 .

[0045] The lower radial magnetic bearing stator 13 is fixedly arranged in the middle of the lower housing 16. Figure 1As shown, a groove is provided in the inner middle part of the lower end shell 16, half of the lower end radial magnetic bearing stator 13 is arranged in the lower end shell 16, and the other half of the lower end radial magnetic bearing stator 13 is arranged in the gap between the lower end shell 16 and the flywheel rotor 9; the lower end radial magnetic bearing rotor 18 is arranged in the middle part of the lower extension part of the flywheel rotor 9, and is arranged corresponding to the lower end radial magnetic bearing stator 13, as shown in FIG. Figure 1 As shown, the lower radial magnetic bearing rotor 18 is at the same horizontal height as the lower radial magnetic bearing stator 13, and has a certain gap with the lower radial magnetic bearing stator 13. The inner circumference of the lower radial magnetic bearing rotor 18 is connected to the outer circumference of the flywheel rotor 9, and the lower radial magnetic bearing rotor 18 is integrated with the flywheel rotor 9.

[0046] The lower end mechanical protection bearing 14 is arranged at the lower extension of the flywheel rotor 9 and has a certain distance from the lower end of the lower extension of the flywheel rotor 9. Figure 1 As shown, the inner circumference of the lower end mechanical protection bearing 14 is connected to the outer circumference of the lower extension of the flywheel rotor 9 , and the outer circumference of the lower end mechanical protection bearing 14 is connected to the inner circumference of the lower end housing 16 .

[0047] Among them, the motor rotor 17, the lower radial magnetic bearing rotor 18, the upper radial magnetic bearing rotor 19 and the flywheel rotor 9 form an integrated rotor, so that the weight of the combined rotor reaches more than ten tons. Through such an arrangement, the power and storage energy of the energy storage flywheel can be increased; and the motor rotor 17, the lower radial magnetic bearing rotor 18, the upper radial magnetic bearing rotor 19 and the flywheel rotor 9 are formed into an integrated rotor for lifting and suspension through the axial magnetic bearing 401.

[0048] When the utility model is used: before starting the energy storage flywheel, firstly, the vacuum port 7 is used to make the interior of the shell composed of the upper sealing cover 1, the upper shell 3, the shell 8, the lower shell 16, and the lower sealing cover 15 reach a certain vacuum degree to meet the vacuum requirement of the motor rotor 17, the lower radial magnetic bearing rotor 18, the upper radial magnetic bearing rotor 19 and the flywheel rotor 9 to rotate as a whole; then the axial magnetic bearing 302, the upper radial magnetic bearing stator 4, and the lower radial magnetic bearing stator 13 are energized to generate magnetic force, and the axial magnetic bearing 6 connects the motor rotor 17, the lower radial magnetic bearing rotor 18 and the upper radial magnetic bearing The rotor 19 is combined with the flywheel rotor 9 to form an integrated rotor lifting suspension. The upper radial magnetic bearing stator 4 and the lower radial magnetic bearing stator 13 realize radial control of the integrated rotor through the magnetic force between the lower radial magnetic bearing rotor 18 and the upper radial magnetic bearing rotor 19. Finally, electricity is input to the motor stator 12 through the electrode 11, thereby driving the flywheel rotor 9 to rotate, driving the integrated rotor to rotate, and realizing energy storage of the energy storage flywheel. When the flywheel needs to output electricity, the electrode 11 stops inputting electricity to the motor stator 12, the flywheel rotor 9 slows down, the motor stator 12 generates an induced electromotive force, and outputs electricity to the outside through the electrode 11.

[0049] Example 2

[0050] The difference between this embodiment and Embodiment 1 is that the upper radial magnetic bearing composed of the upper radial magnetic bearing stator 4 and the upper radial magnetic bearing rotor 19 can be replaced by a mechanical working bearing; the lower magnetic bearing composed of the lower radial magnetic bearing rotor 18 and the lower mechanical protection bearing 14 can be replaced by a mechanical working bearing.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the scope disclosed by the present invention according to the technical solution and concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An energy storage flywheel, characterized in that: It includes a housing, a rotor, a stator and bearings; The housing is a hollow shell; The rotor is arranged inside the housing, and there is a gap between the rotor and the housing; The rotor includes a flywheel rotor, an upper radial magnetic bearing rotor, a motor rotor and a lower radial magnetic bearing rotor. The upper radial magnetic bearing rotor is sleeved outside the upper extension of the flywheel rotor; both the motor rotor and the lower radial magnetic bearing rotor are sleeved outside the downward extension of the flywheel rotor, and the motor rotor is above the lower radial magnetic bearing rotor; The stator is fixedly arranged on the housing; The bearings are arranged in the gap between the rotor and the housing; The flywheel rotor, the upper radial magnetic bearing rotor, the motor rotor and the lower radial magnetic bearing rotor are coaxial and of an integral structure. The mass of the rotor is more than ten tons and it is of a fully suspended type.

2. The energy storage flywheel according to claim 1, characterized in that: The flywheel rotor is in the shape of a Chinese character 'zhong'. The middle part of the flywheel rotor is cylindrical, and the shape of the housing corresponds to that of the flywheel rotor; The flywheel rotor extends upward to form an upper extension. The upper extension of the flywheel rotor extends upward from the center of the upper surface of the middle part of the flywheel rotor to a preset distance; The lower extension of the flywheel rotor extends downward from the center of the lower surface of the middle part of the flywheel rotor to a preset distance, and both the upper extension and the lower extension are cylindrical.

3. The energy storage flywheel according to claim 1, characterized in that: The stator is arranged outside the rotor and has a preset distance from the outside of the rotor.

4. The energy storage flywheel according to claim 1, characterized in that: A vacuum pumping port is opened in the middle of the housing, and the vacuum pumping port penetrates the housing.

5. The energy storage flywheel according to claim 1, characterized in that: An electrode is arranged at the upper part of the lower part of the housing. The electrode penetrates one side of the housing and is connected to the stator.

6. The energy storage flywheel according to claim 5, characterized in that: The bearings include an upper mechanical protection bearing, an axial magnetic bearing and a lower mechanical protection bearing. The upper mechanical protection bearing is arranged above the upper radial magnetic bearing rotor and has a preset distance from the upper radial magnetic bearing rotor; the lower mechanical protection bearing is arranged below the lower radial magnetic bearing rotor and has a preset distance from the lower radial magnetic bearing rotor; the axial magnetic bearing is fixedly arranged above the middle part of the flywheel rotor.

7. The energy storage flywheel according to claim 6, characterized in that: The stator includes an upper radial magnetic bearing stator, a motor stator and a lower radial magnetic bearing stator, and the input end of the electrode is connected to the output end of the electrode stator.

8. The energy storage flywheel according to claim 7, characterized in that: The upper radial magnetic bearing composed of the upper radial magnetic bearing rotor and the upper radial magnetic bearing stator is a mechanical working bearing; the lower magnetic bearing composed of the lower radial magnetic bearing rotor and the lower mechanical protection bearing is a mechanical working bearing.

9. The energy storage flywheel according to claim 8, characterized in that: The housing includes an upper sealing cover, an upper housing, an upper cover, a housing body, a lower cover, a lower housing and a lower sealing cover; The lower surface of the upper sealing cover abuts against the upper surface of the upper housing, the lower surface of the upper housing abuts against the upper surface of the upper cover, the lower surface of the upper cover abuts against the upper surface of the housing body, the upper surface of the housing body abuts against the upper surface of the lower cover, the lower surface of the lower cover abuts against the upper surface of the lower housing, and the lower surface of the lower housing abuts against the upper surface of the lower sealing cover; There is an opening below the housing body, and the inner wall of the opening is connected to the lower extension of the flywheel rotor.

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