CN113346670A - Flywheel easy to dissipate heat and flywheel energy storage system - Google Patents
Flywheel easy to dissipate heat and flywheel energy storage system Download PDFInfo
- Publication number
- CN113346670A CN113346670A CN202110580825.5A CN202110580825A CN113346670A CN 113346670 A CN113346670 A CN 113346670A CN 202110580825 A CN202110580825 A CN 202110580825A CN 113346670 A CN113346670 A CN 113346670A
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- flywheel
- heat dissipation
- heat
- shaft
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/30—Flywheels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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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
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
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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)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention relates to an easy-heat-dissipation flywheel and a flywheel energy storage system, wherein the easy-heat-dissipation flywheel comprises a water jacket shell, a heat dissipation plate and a flywheel heat dissipation shaft; the heat dissipation plate is sleeved on the flywheel heat dissipation shaft and is spaced from a heat dissipation neck of the flywheel heat dissipation shaft by a preset distance; the heat dissipation plate is attached to the inner wall of the water jacket shell. According to the flywheel easy to dissipate heat, the heat dissipation plate is arranged near the flywheel heat dissipation shaft and is directly connected with the outer water jacket shell, the temperature of the heat dissipation plate is low, so that a large temperature difference is maintained between the flywheel heat dissipation shaft and the heat dissipation plate, the radiation thermal resistance can be greatly reduced according to the radiation heat dissipation principle, the heat dissipation radiation of the flywheel heat dissipation shaft to the heat dissipation plate is accelerated, and the purpose of reducing the temperature of the flywheel is achieved.
Description
Technical Field
The invention relates to the field of mechanical energy storage devices, in particular to an easily-radiating flywheel and a flywheel energy storage system.
Background
The regulation of the power grid is an important link in the power transmission project, when the energy provided by the power grid is higher than the energy required by a load, a flywheel system in the power grid works in a charging state, and a controller controls a motor to drive a flywheel to rotate so as to convert electric energy into mechanical energy for storage. When the energy provided by the power grid is lower than the requirement of the load, the flywheel works in a power generation state under the control of the controller, converts the mechanical energy into electric energy, and supplies the electric energy to the load after power conversion.
Because the interior of the flywheel energy storage system is in a vacuum environment, the flywheel bearing which runs at a high speed generates heat relatively high, if the temperature is too high, the service life of the bearing is rapidly reduced, even failure or burnout can be caused, and the temperature of the flywheel system influences the overall performance of the system, so that the heat dissipation problem of the flywheel supporting piece (bearing) plays a crucial role in ensuring the normal work of the energy storage flywheel system, at present, the heat dissipation of the flywheel bearing is realized by processing a shell into a spiral water channel, and fluid flows in the water channel by the consumption of electric energy of a compressor, thereby realizing the purpose of heat dissipation.
The bearing heating is mainly divided into outer ring raceway friction power consumption, inner ring raceway friction power consumption, ball stirring oil power consumption and inner ring flange guide friction power consumption, wherein the outer ring raceway friction power consumption only occupies a small part, and the inner ring raceway friction power consumption, the ball stirring oil power consumption and the inner ring flange guide friction power consumption are main heating sources. The existing flywheel energy storage supporting bearing realizes heat dissipation by taking away heat through shell water channel flowing, most of friction power consumption generated by an outer ring can be taken away by the structure, the bearing is in a vacuum environment, the conduction coefficient of lubricating grease is small, the heat of the inner ring is hardly transferred to the outer ring, the temperature of the inner ring is high, and the maximum rotating speed of a flywheel is limited.
Disclosure of Invention
In view of the above, it is desirable to provide a flywheel and a flywheel energy storage system with easy heat dissipation, which address at least one of the above-mentioned problems.
In a first aspect, the invention provides an easy-to-radiate flywheel, which comprises a water jacket shell, a radiating plate and a flywheel radiating shaft; the heat dissipation plate is sleeved on the flywheel heat dissipation shaft and is spaced from a heat dissipation neck of the flywheel heat dissipation shaft by a preset distance; the heat dissipation plate is attached to the inner wall of the water jacket shell.
In certain implementations of the first aspect, a cross-sectional shape of the heat dissipating neck along an axial direction of the flywheel heat dissipating shaft is stepped, and the heat dissipating plate is provided with a through hole, and the cross-sectional shape of the through hole along the axial direction of the through hole is stepped to match the heat dissipating neck.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, a ratio of a difference between radii of the heat dissipation plate and the flywheel heat dissipation shaft to the preset distance is not less than 5.
With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, a ratio of an orthographic area of the heat dissipation neck on the heat dissipation plate to a radial cross-sectional area of the flywheel heat dissipation shaft is greater than or equal to 10.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the heat dissipation plate is attached to the water jacket housing by fitting with a plurality of bolts.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, a material of the heat dissipation plate is one of aluminum, copper, and silver.
In a second aspect, the present application further provides a flywheel energy storage system, which includes a motor, a controller, a power electronic converter, and the flywheel with easy heat dissipation as described in the first invention of the present application.
The technical scheme provided by the embodiment of the invention has the following beneficial technical effects:
according to the flywheel easy to dissipate heat, the heat dissipation plate is arranged near the flywheel heat dissipation shaft and is directly connected with the outer water jacket shell, the temperature of the heat dissipation plate is low, so that a large temperature difference is maintained between the flywheel heat dissipation shaft and the heat dissipation plate, the radiation thermal resistance can be greatly reduced according to the radiation heat dissipation principle, the heat dissipation radiation of the flywheel heat dissipation shaft to the heat dissipation plate is accelerated, and the purpose of reducing the temperature of the flywheel is achieved.
Additional aspects and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic cross-sectional view of an easy-heat-dissipation flywheel according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of FIG. 1 at A in an embodiment of the present application;
FIG. 3 is a schematic perspective view of a flywheel heat dissipating shaft according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of FIG. 3 at B in an embodiment of the present application;
fig. 5 is a schematic perspective view of a heat dissipation plate according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Possible embodiments of the invention are given in the figures. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein by the accompanying drawings. The embodiments described by way of reference to the drawings are illustrative for the purpose of providing a more thorough understanding of the present disclosure and are not to be construed as limiting the present invention. Furthermore, if a detailed description of known technologies is not necessary for illustrating the features of the present invention, such technical details may be omitted.
It will be understood by those skilled in the relevant art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It is to be understood that the term "and/or" as used herein is intended to include all or any and all combinations of one or more of the associated listed items.
The technical solution of the present invention and how to solve the above technical problems will be described in detail with specific examples.
An embodiment of the first aspect of the present application provides an easy-heat-dissipation flywheel, as shown in fig. 1 and 2, including a water jacket housing 100, a heat dissipation plate 200, and a flywheel heat dissipation shaft 300; the heat dissipation plate 200 is sleeved on the flywheel heat dissipation shaft 300 and is spaced from the heat dissipation neck 310 of the flywheel heat dissipation shaft 300 by a preset distance; the heat dissipation plate 200 is attached to the inner wall of the water jacket housing 100. The heat dissipation plate 200 is made of a material having a large thermal emissivity, or the surface of the heat dissipation plate includes a coating layer having a high thermal emissivity. For example, carbon black is coated on the surface of the heat dissipating plate, or GJT series high-emissivity ceramic paint, HT series high-emissivity paint, or the like is used so that the surface emissivity becomes about 0.9, and the thickness of the coating layer may be about 0.2 mm.
According to the flywheel easy to dissipate heat, the heat dissipation plate 200 is arranged near the flywheel heat dissipation shaft 300, the heat dissipation plate 200 is directly connected with the outer water jacket shell 100, the temperature of the heat dissipation plate 200 is low, so that a large temperature difference is maintained between the flywheel heat dissipation shaft 300 and the heat dissipation plate 200, the radiation thermal resistance can be greatly reduced according to the radiation heat dissipation principle, the heat dissipation radiation of the flywheel heat dissipation shaft 300 to the heat dissipation plate 200 is accelerated, and the purpose of reducing the temperature is achieved.
Optionally, in some implementations of the embodiments of the first aspect of the present application, as shown in fig. 3 and 4, the cross-sectional shape of the heat dissipating neck 310 along the axial direction of the flywheel heat dissipating shaft 300 is a step shape, and the heat dissipating plate 200 is provided with a through hole, as shown in fig. 5, the cross-sectional shape of the through hole along the axial direction of the through hole is a step shape matching with the heat dissipating neck 310. In order to improve the heat exchange efficiency between the heat sink 200 and the flywheel heat sink shaft 300, the radiation area between the heat sink 200 and the flywheel heat sink shaft 300 needs to be increased as much as possible, and the through hole of the heat sink 200 is stepped, and accordingly the heat sink neck 310 on the flywheel heat sink shaft 300 is also stepped, so that the radiation area between the two can be increased to a greater extent.
Optionally, with reference to the embodiment of the first aspect and the foregoing implementation manners, in another implementation manner of the embodiment of the first aspect, a ratio of a difference between the radii of the heat dissipation plate and the flywheel heat dissipation shaft to the preset distance is not less than 5. Because the interior of the flywheel belongs to a vacuum environment, radiation is a main heat dissipation path, radiation can be equivalent to thermal radiation resistance, the smaller the thermal radiation resistance is, the stronger the heat dissipation capacity is, and therefore, according to the thermal radiation resistance principle, under the condition of a certain temperature difference, the direct relation exists between the thermal radiation resistance and the area and the radiation angle coefficient, namely, the larger the radiation angle coefficient is, the larger the radiation area is, the larger the denominator is, the smaller the radiation resistance is, and the radiation angle coefficient is directly related to the radiation area and the radiation distance. In some cases, considering that the flywheel shaft is heated to generate a large axial displacement of about 1mm, it is necessary to ensure that the flywheel shaft is not locked and can also exert the maximum heat dissipation performance, and it is necessary to have a better heat dissipation effect at an interval of about 1.3mm to 4mm, so that: the preset distance (the radius of the radiating plate surface minus the radius of the flywheel radiating shaft) is more than or equal to 5, and a good radiating effect can be obtained.
Furthermore, in order to avoid the contact between the flywheel heat dissipation shaft 300 and the heat dissipation plate 200, thereby generating heat due to friction, damaging the heat dissipation plate 200 and consuming more energy of the flywheel, the flywheel heat dissipation shaft 300 and the heat dissipation plate 200 need to be separated by a certain distance, and when the separation distance is 1.3 mm-4 mm, the heat dissipation shaft and the heat dissipation plate can not only ensure that the flywheel heat dissipation shaft and the heat dissipation plate have better heat radiation efficiency, but also avoid the contact between the flywheel heat dissipation shaft and the heat dissipation plate due to thermal expansion.
Optionally, in combination with the embodiments of the first aspect and the several specific implementations described above, in some implementations of the embodiments of the first aspect, a ratio of an orthographic projection area of the heat dissipating neck 310 on the heat dissipating plate 200 to a radial cross-sectional area of the flywheel heat dissipating shaft 300 is greater than or equal to 10. The purpose of setting up the heat dissipation neck 310 lies in expanding the heat radiation area between flywheel heat dissipation axle 300 and heat dissipation board 200, sets up the orthographic projection area of heat dissipation neck 310 on heat dissipation board 200 to more than 10 times of the cross-sectional area of flywheel heat dissipation axle 300, has set up a great heat dissipation neck 310 on flywheel heat dissipation axle 300 equivalently, combines aforementioned radiant efficiency analysis, and the scheme that this application adopted can obtain good radiating effect.
Alternatively, in still other implementations of the first aspect embodiment, the heat dissipation plate 200 is attached to the water jacket housing 100 by a plurality of bolts. The heat dissipation plate 200 is mounted on the water jacket shell 100 by using bolts, so that the heat dissipation plate 200 and the water jacket shell 100 can be sufficiently and firmly mounted with low cost, the bolts are used for locking, pretightening force is applied, the stress range of a matching surface reaches the tight and gapless mechanical property, and the heat on the heat dissipation plate 200 is ensured to be timely transmitted to the water jacket shell 100.
Optionally, with reference to the embodiment of the first aspect and the foregoing specific implementation manners, in some implementation manners of the embodiment of the first aspect, a material of the heat dissipation plate 200 is one of aluminum, copper, and silver. The aluminum material can be selected for manufacturing, so that the cost can be saved, and the heat dissipation plate 200 can have better heat dissipation efficiency, so that the heat collected from the flywheel heat dissipation shaft 300 can be dissipated to the water jacket shell 100 more quickly by the heat dissipation plate 200.
Embodiments of the second aspect of the present application further provide a flywheel energy storage system, which includes a motor, a controller, a power electronic converter, and the flywheel with easy heat dissipation as described in the first aspect of the present application. The flywheel energy storage system generally includes a flywheel body that rotates at high speed, a motor/generator, a controller, and a power electronics inverter, where the flywheel body and the motor/generator are supported by magnetic bearings and sealed within a vacuum device.
According to the flywheel energy storage system, the flywheel which is easy to dissipate heat is adopted, so that the heat dissipation efficiency is high, and the service life is longer.
It will be appreciated by those skilled in the art that, in the description of the present application, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (7)
1. A flywheel easy to dissipate heat is characterized by comprising a water jacket shell, a heat dissipation plate and a flywheel heat dissipation shaft; the heat dissipation plate is sleeved on the flywheel heat dissipation shaft and is spaced from a heat dissipation neck of the flywheel heat dissipation shaft by a preset distance;
the heat dissipation plate is attached to the inner wall of the water jacket shell.
2. The flywheel of claim 1, wherein the heat dissipating neck has a step-like cross section along the axial direction of the flywheel heat dissipating shaft, and the heat dissipating plate has a through hole having a step-like cross section along the axial direction of the through hole, the step-like cross section being matched with the heat dissipating neck.
3. The flywheel of claim 1, wherein the ratio of the difference between the radii of the heat dissipating plate and the flywheel heat dissipating shaft to the predetermined distance is not less than 5.
4. A flywheel dissipating heat easily according to claim 1, wherein the ratio of the orthographic area of the heat dissipating neck on the heat dissipating plate to the radial cross-sectional area of the flywheel heat dissipating shaft is greater than or equal to 10.
5. The flywheel of claim 1, wherein the heat sink is attached to the water jacket housing by a plurality of bolts.
6. The flywheel of claim 1, wherein the heat sink is made of one of aluminum, copper or silver.
7. A flywheel energy storage system comprising an electric machine, a controller, a power electronic converter and an easily heat dissipating flywheel as claimed in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110580825.5A CN113346670A (en) | 2021-05-26 | 2021-05-26 | Flywheel easy to dissipate heat and flywheel energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110580825.5A CN113346670A (en) | 2021-05-26 | 2021-05-26 | Flywheel easy to dissipate heat and flywheel energy storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113346670A true CN113346670A (en) | 2021-09-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110580825.5A Withdrawn CN113346670A (en) | 2021-05-26 | 2021-05-26 | Flywheel easy to dissipate heat and flywheel energy storage system |
Country Status (1)
| Country | Link |
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| CN (1) | CN113346670A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114400824A (en) * | 2022-02-09 | 2022-04-26 | 内蒙古工业大学 | Movable flywheel energy storage system |
| CN114448162A (en) * | 2022-04-06 | 2022-05-06 | 华驰动能(北京)科技有限公司 | Magnetic suspension energy storage flywheel with active heat dissipation function and energy storage equipment |
| CN115037092A (en) * | 2022-08-10 | 2022-09-09 | 华驰动能(北京)科技有限公司 | Energy storage flywheel and energy storage equipment with interior vacuum environment capable of dissipating heat |
-
2021
- 2021-05-26 CN CN202110580825.5A patent/CN113346670A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114400824A (en) * | 2022-02-09 | 2022-04-26 | 内蒙古工业大学 | Movable flywheel energy storage system |
| CN114448162A (en) * | 2022-04-06 | 2022-05-06 | 华驰动能(北京)科技有限公司 | Magnetic suspension energy storage flywheel with active heat dissipation function and energy storage equipment |
| CN114448162B (en) * | 2022-04-06 | 2022-06-07 | 华驰动能(北京)科技有限公司 | Magnetic suspension energy storage flywheel with active heat dissipation function and energy storage equipment |
| CN115037092A (en) * | 2022-08-10 | 2022-09-09 | 华驰动能(北京)科技有限公司 | Energy storage flywheel and energy storage equipment with interior vacuum environment capable of dissipating heat |
| CN115037092B (en) * | 2022-08-10 | 2022-10-28 | 华驰动能(北京)科技有限公司 | Energy storage flywheel and energy storage equipment with interior vacuum environment capable of dissipating heat |
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Application publication date: 20210903 |
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