CN113489232A - Flywheel structure and flywheel energy storage system - Google Patents
Flywheel structure and flywheel energy storage system Download PDFInfo
- Publication number
- CN113489232A CN113489232A CN202110868168.4A CN202110868168A CN113489232A CN 113489232 A CN113489232 A CN 113489232A CN 202110868168 A CN202110868168 A CN 202110868168A CN 113489232 A CN113489232 A CN 113489232A
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- Prior art keywords
- mandrel
- flywheel
- groove
- wheel disc
- energy storage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/02—Additional mass for increasing inertia, e.g. flywheels
- H02K7/025—Additional mass for increasing inertia, e.g. flywheels for power storage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention relates to the technical field of flywheel energy storage systems, and provides a flywheel structure and an energy storage system, wherein the flywheel structure comprises a mandrel, wherein a groove is formed in the mandrel, and the groove is formed along the circumferential direction of the mandrel; and the wheel disc is sleeved on the mandrel, wherein the position of the wheel disc and the position of the groove are staggered along the extension direction of the mandrel. According to the flywheel structure provided by the invention, the groove is formed in the mandrel, the diameter of the mandrel is smaller than that of the wheel disc, when the flywheel rotates at a certain speed, the linear speed of the mandrel is smaller, the local stress of the groove on the mandrel can be reduced, and the mandrel is prevented from being fatigue-damaged due to overlarge local stress; meanwhile, the wheel disc is not required to be provided with the groove, so that the wheel disc is prevented from being subjected to fatigue damage, the integral strength of the flywheel is improved, and the service life of the flywheel is prolonged.
Description
Technical Field
The invention relates to the technical field of flywheel energy storage systems, in particular to a flywheel structure and a flywheel energy storage system.
Background
The flywheel energy storage system is an energy storage device for converting mechanical energy and electrical energy. The system adopts a physical method to store energy, and realizes the mutual conversion and storage between electric energy and mechanical kinetic energy of a high-speed running flywheel through an electric/power generation mutual-inverse type bidirectional motor.
Because the mass of each part of any object can be different, the mass unevenness can affect the stability of the object rotation under static state and low-speed rotation, and the higher the rotating speed, the larger the vibration can be. In order to ensure stable operation of the flywheel operating at high speed, the flywheel needs to be subjected to dynamic balance treatment. At present, the commonly adopted method is to arrange a groove on the disc surface of the wheel disc and then arrange a dynamic balance block at the corresponding position in the groove according to actual needs so as to ensure that the quality of each part of the wheel disc is more uniform. However, in the running process of the flywheel, the linear velocity of the wheel disc is high, so that the local stress at the groove on the wheel disc is too high, the wheel disc is easy to be damaged by fatigue, and even cracks can be caused on the wheel disc in severe cases.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem that the flywheel in the prior art needs to be subjected to dynamic balance treatment, and a groove needs to be formed in a wheel disc, so that the wheel disc is easy to fatigue damage due to overlarge local stress at the groove on the wheel disc, and even cracks can be generated on the wheel disc in case of serious conditions, thereby providing a flywheel structure and a flywheel energy storage system.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a flywheel structure comprises a mandrel, wherein a groove is formed in the mandrel and is formed in the circumferential direction of the mandrel; and the wheel disc is sleeved on the mandrel, wherein the position of the wheel disc and the position of the groove are staggered along the extension direction of the mandrel.
Furthermore, a convex part is arranged on the side wall of the mandrel, is arranged along the circumferential direction of the mandrel and is suitable for bearing a wheel disc of the flywheel; the groove is arranged on the side wall of the convex part.
Further, the groove is a dovetail groove, and the opening of the groove is gradually reduced along the axial direction far away from the mandrel.
Further, the wheel disc comprises a plurality of wheel discs which are nested.
Furthermore, the material of the wheel disc of the inner ring is glass or carbon fiber; the wheel disc of the outer ring is made of glass or carbon fiber; the middle wheel disc is made of a mixture of carbon fibers and glass.
Further, the end face of the mandrel is in a regular hexagon shape.
Further, the radius of the circumscribed circle of the mandrel is L, the radius of the inscribed circle of the mandrel is M, the deformation amount of the wheel disc at the limit rotating speed is H, and L-M is larger than or equal to 2H.
Furthermore, the flywheel energy storage system also comprises a shell, wherein an operation hole is formed in the shell, and a sealing cover is arranged at the operation hole; the groove is aligned with the operation hole, and the dynamic balance block is suitable for being installed in the groove through the operation hole.
Further, the operation hole is provided on a side wall of the housing; the groove is arranged on the side wall of the mandrel.
The technical scheme of the invention has the following advantages:
according to the flywheel structure provided by the invention, the groove is formed in the mandrel, the diameter of the mandrel is smaller than that of the wheel disc, when the flywheel rotates at a certain speed, the linear speed of the mandrel is smaller, the local stress of the groove on the mandrel can be reduced, and the mandrel is prevented from being damaged due to fatigue; meanwhile, the wheel disc is not required to be provided with the groove, so that the wheel disc is prevented from being subjected to fatigue damage, the integral strength of the flywheel is improved, and the service life of the flywheel is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a front view of a flywheel construction in one embodiment of the invention;
FIG. 2 is a schematic diagram of a groove in a flywheel structure according to an embodiment of the present invention;
FIG. 3 is a top view of a flywheel construction in one embodiment of the invention;
fig. 4 is a schematic structural diagram of a flywheel energy storage system according to an embodiment of the invention.
Description of reference numerals:
1. a mandrel; 2. A wheel disc; 3. A convex portion;
4. a groove; 5. An operation hole; 6. A sealing cover;
7. a housing.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
FIG. 1 is a front view of a flywheel construction in one embodiment of the invention; as shown in fig. 1, the present embodiment provides a flywheel structure, which includes a mandrel 1, a groove 4 is disposed on the mandrel 1, and the groove 4 is disposed along a circumferential direction of the mandrel 1; the wheel disc 2 is sleeved on the mandrel 1, wherein the positions of the wheel disc 2 and the groove 4 are staggered along the extending direction of the mandrel 1.
Specifically, the groove 4 on the mandrel 1 may be an annular groove 4, and the groove 4 may be provided on a side wall of the mandrel 1 or an end surface of the mandrel 1. When the groove 4 is arranged on the side wall of the mandrel 1, the groove 4 can be arranged close to the bottom end of the mandrel 1, so that the groove 4 can not be shielded after the mandrel 1 is sleeved with the wheel disc 2.
According to the flywheel structure provided by the invention, the groove 4 is formed in the mandrel 1, the diameter of the mandrel 1 is smaller than that of the wheel disc 2, when the flywheel rotates at a certain speed, the linear speed of the mandrel 1 is smaller, the local stress of the groove 4 in the mandrel 1 can be reduced, and the mandrel 1 is prevented from being fatigue damaged; meanwhile, the grooves 4 do not need to be formed in the wheel disc 2, fatigue damage to the wheel disc 2 is avoided, the overall strength of the flywheel is improved, and the service life of the flywheel is prolonged.
In the embodiment, the side wall of the mandrel 1 is provided with the convex part 3, and the convex part 3 is arranged along the circumferential direction of the mandrel 1 and is suitable for bearing the wheel disc 2 of the flywheel; the grooves 4 are provided on the side walls of the projections 3. Wherein, the convex part 3 can be arranged near the bottom of the mandrel 1, and the convex part 3 is arranged for a whole circle along the circumferential direction of the mandrel 1. During machining, the convex portion 3 may be machined on the mandrel 1 by cutting. During the use, 2 covers of rim plate are established behind dabber 1, and the lower wall face of rim plate 2 can contact with the top surface of convex part 3, and convex part 3 can play certain supporting role to rim plate 2, prevents that rim plate 2 from weighing down. Meanwhile, the convex part 3 can also play a role in axial positioning, and is favorable for improving the installation precision of the mandrel 1.
FIG. 2 is a schematic diagram of a groove in a flywheel structure according to an embodiment of the present invention; as shown in fig. 2, in the present embodiment, the groove 4 is a dovetail groove, and the opening of the groove 4 is gradually reduced in the direction away from the axis of the mandrel 1. So set up, can make the dynamic balance piece more inseparable with being connected of recess 4, prevent that the dynamic balance piece from droing in the recess 4. Wherein, in order to reduce the stress concentration, the included angle position of the groove 4 can be chamfered.
FIG. 3 is a top view of a flywheel construction in one embodiment of the invention; as shown in fig. 3, in the present embodiment, the wheel disc 2 includes a plurality of wheel discs 2, and the plurality of wheel discs 2 are nested. Wherein the number of nested discs 2 can be set as desired. For example, the number of the roulette plate 2 is three.
In this embodiment, the wheel disc 2 of the inner ring is made of glass; the wheel disc 2 of the outer ring is made of carbon fiber; the material of the middle wheel disc 2 is a mixture of carbon fiber and glass. Wherein, the wheel disc 2 of the inner ring is the wheel disc 2 which is directly sleeved on the mandrel 1. So set up, the combined material quality is lighter on the one hand, and on the other hand combined material's circumference intensity is bigger, can bear bigger circumference stress, consequently makes the flywheel can reach higher rotational speed, is favorable to improving the energy storage density of flywheel. The wheel disc 2 of the inner ring can also be made of carbon fiber; the material of the outer ring wheel 2 may be glass.
In this embodiment, the end surface of the mandrel 1 is a regular hexagon. Due to the material difference between the wheel disc 2 made of composite material and the mandrel 1 made of alloy steel, the elastic modulus of the two parts is different. The elastic modulus of the central mandrel 1 is large, when the flywheel rotates at a high speed, the deformation amount of the wheel disc 2 is larger than that of the mandrel 1 due to the centrifugal force, and finally, the mandrel 1 is separated from the wheel disc 2, so that torque cannot be normally transmitted. At this moment, the end face of the mandrel 1 is designed into a regular hexagon from an original circle, when the mandrel 1 rotates, the vertex angle of the regular hexagon is easy to deform, and the mandrel 1 and the wheel disc 2 can be kept in a contact state after the deformation quantity is increased, so that torque can be normally transmitted. Wherein, the wheel disc 2 directly contacted with the mandrel 1 is the wheel disc 2 of the inner ring. In this case, the mounting hole of the wheel disc 2 for connecting to the spindle 1 should also be regular hexagonal. The end surface shape of the mandrel 1 is not limited to a regular hexagon, and may be other regular polygons.
In the embodiment, the radius of the circumscribed circle of the mandrel 1 is L, the radius of the inscribed circle of the mandrel 1 is M, the deformation amount of the wheel disc 2 at the limit rotating speed is H, and L-M is larger than or equal to 2H. Wherein, H is the deformation of the wheel disc 2 of the inner ring at the limit rotating speed. When the difference between L and M is too small, the amount of deformation of the spindle 1 is too small, and the spindle 1 and the wheel disc 2 cannot be kept in contact with each other. Therefore, on the premise of not influencing the use of the mandrel 1, the difference value between L and M is increased, so that the separation prevention effect is improved.
In this embodiment, the rotation speed of the mandrel 1 may range from 6000rpm to 15000 rpm. Wherein the radius of the mandrel 1 may be determined in dependence of the linear speed of the mandrel 1 not exceeding 400m/s and the radius of the disc 2 may be determined in dependence of the linear speed of the disc 2 not exceeding 600 m/s.
Fig. 4 is a schematic structural diagram of a flywheel energy storage system according to an embodiment of the present invention, and as shown in fig. 4, the present application further provides a flywheel energy storage system, which includes a housing 7, an operation hole 5 is formed on the housing 7, and a sealing cover 6 is disposed at the operation hole 5; the groove 4 is arranged in alignment with the operation hole 5, and is suitable for installing the dynamic balance block in the groove 4 through the operation hole 5. Wherein the position of the operation hole 5 can be determined according to the position of the groove 4. Since the inside of the housing 7 needs to be maintained in a vacuum state during the operation of the flywheel, after the dynamic balance weight is mounted in the recess 4, the sealing cover 6 outside the operation hole 5 needs to be covered, and then the air inside the housing 7 needs to be evacuated. Wherein, the shape and the size of the sealing cover 6 can be matched with the shape and the size of the operation hole 5. Wherein, the dynamic balance block can be bonded or welded in the groove 4 on the mandrel 1. So set up, when carrying out dynamic balance to the flywheel, need not to hang out whole flywheel from energy storage system's casing 7 with lifting device, carry out the installation of dynamic balance piece again. The operation can be simplified, the maintenance difficulty is reduced, and the maintenance efficiency is improved.
In this embodiment, the operation hole 5 is provided on a side wall of the housing 7, and correspondingly, the groove 4 is provided on a side wall of the mandrel 1.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A flywheel construction, comprising,
the core shaft is provided with a groove, and the groove is arranged along the circumferential direction of the core shaft;
and the wheel disc is sleeved on the mandrel, wherein the position of the wheel disc and the position of the groove are staggered along the extension direction of the mandrel.
2. The flywheel construction of claim 1,
the side wall of the mandrel is provided with a convex part which is arranged along the circumferential direction of the mandrel and is suitable for bearing a wheel disc of the flywheel;
the groove is arranged on the side wall of the convex part.
3. The flywheel construction of claim 1,
the groove is a dovetail groove, and the opening of the groove is gradually reduced along the axial direction far away from the mandrel.
4. The flywheel construction of claim 1,
the wheel disc comprises a plurality of wheel discs which are nested.
5. The flywheel construction of claim 4,
the wheel disc of the inner ring is made of glass or carbon fiber;
the wheel disc of the outer ring is made of glass or carbon fiber;
the middle wheel disc is made of a mixture of carbon fibers and glass.
6. The flywheel construction of claim 1,
the end surface of the mandrel is in a regular hexagon shape.
7. The flywheel construction of claim 6,
the radius of the circumscribed circle of the mandrel is L, the radius of the inscribed circle of the mandrel is M, the deformation quantity of the wheel disc at the limit rotating speed is H, and L-M is larger than or equal to 2H.
8. A flywheel energy storage system comprising a flywheel arrangement as claimed in any one of claims 1 to 7.
9. The flywheel energy storage system of claim 8, further comprising,
the device comprises a shell, a handle and a sealing cover, wherein the shell is provided with an operation hole;
the groove is aligned with the operation hole, and the dynamic balance block is suitable for being installed in the groove through the operation hole.
10. The flywheel energy storage system of claim 9,
the operation hole is arranged on the side wall of the shell;
the groove is arranged on the side wall of the mandrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110868168.4A CN113489232A (en) | 2021-07-29 | 2021-07-29 | Flywheel structure and flywheel energy storage system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110868168.4A CN113489232A (en) | 2021-07-29 | 2021-07-29 | Flywheel structure and flywheel energy storage system |
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| Publication Number | Publication Date |
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| CN113489232A true CN113489232A (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110868168.4A Pending CN113489232A (en) | 2021-07-29 | 2021-07-29 | Flywheel structure and flywheel energy storage system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421706A (en) * | 2022-04-01 | 2022-04-29 | 华驰动能(北京)科技有限公司 | Flywheel energy storage device capable of automatically balancing in vacuum environment |
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Application publication date: 20211008 |