Energy storage flywheel and energy storage device with internal vacuum environment

Abstract

The application discloses an energy storage flywheel and an energy storage device with a vacuum environment inside, wherein the energy storage flywheel with the vacuum environment inside comprises a first shell, a second shell, a flywheel rotor and a motor assembly; the flywheel rotor is arranged in the first shell; the second shell is connected to the outside of the first shell and surrounds the first shell to form a first containing cavity; the motor assembly comprises a motor rotor and a motor stator; the motor rotor is arranged in the first shell and annularly arranged outside the flywheel rotor; the motor stator is arranged in the first containing cavity and annularly arranged outside the motor rotor; and the second shell is provided with a plurality of ventilation openings communicated with the first containing cavity. The motor stator and the flywheel rotor of the energy storage flywheel with the vacuum environment inside are arranged in different spaces, the heat transfer amount of the motor stator to the space where the flywheel rotor is arranged is reduced, the heat dissipation efficiency of the flywheel rotor is improved, no transmission member such as a magnetic coupling needs to be arranged, the energy storage flywheel is small in size, and the flywheel rotor has a fast response.

Description

Technical Field

[0001] This invention belongs to the field of energy storage equipment technology, specifically, it relates to an energy storage flywheel and energy storage equipment with an internal vacuum environment. Background Technology

[0002] Flywheel energy storage systems operate under special conditions of high vacuum. Since the heat generated by the motor cannot be dissipated through convection in the air, it can only rely on its own radiation or other special methods to dissipate heat.

[0003] In common energy storage flywheels, the motor and flywheel rotor are both located in the same space. Since the motor radiates a large amount of heat during operation, the internal temperature of the casing is high, making it difficult for the flywheel rotor to dissipate heat. To address the problem of low heat dissipation efficiency of the flywheel rotor due to motor heat dissipation, a split-layout energy storage flywheel has been proposed in related technologies. This involves arranging the motor and flywheel rotor separately to prevent the heat generated by the motor from being transferred to the space where the flywheel rotor is located. However, arranging the motor and flywheel rotor separately increases the volume of the energy storage flywheel. Furthermore, the motor needs to be driven to the flywheel rotor via a magnetic coupling, which increases the number of parts and increases the cost. In addition, the magnetic coupling transmission has a start-up delay, resulting in a slow response of the flywheel rotor and low performance of the energy storage flywheel. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose an energy storage flywheel with an internal vacuum environment. In this flywheel, the motor stator and flywheel rotor are arranged in different spaces, reducing heat transfer from the motor stator to the flywheel rotor space. This improves the heat dissipation efficiency of the flywheel rotor in a vacuum environment. Furthermore, compared to related technologies that arrange the motor assembly and flywheel rotor in different spaces, the motor rotor of this energy storage flywheel is still mounted on the flywheel rotor, and the position of the motor stator relative to the flywheel rotor remains unchanged. The motor assembly can directly drive the flywheel rotor to rotate, eliminating the need for transmission components such as magnetic couplings. This results in fewer components, a smaller flywheel size, faster flywheel rotor response, better performance, and lower cost.

[0005] An embodiment of the present invention also proposes an energy storage device.

[0006] The energy storage flywheel of this invention, which has an internal vacuum environment, includes: a first housing and a flywheel rotor, wherein the first housing is a vacuum and the flywheel rotor is disposed within the first housing; a second housing and a motor assembly, wherein the second housing is connected to the outside of the first housing and forms a first receiving cavity with the first housing; the motor assembly includes a motor rotor and a motor stator, wherein the motor rotor is disposed within the first housing and surrounds the outer peripheral surface of the flywheel rotor, and the motor stator is disposed within the first receiving cavity and surrounds the outer periphery of the motor rotor; the second housing has a plurality of ventilation openings communicating with the first receiving cavity.

[0007] The internal structure of this invention is a vacuum annular energy storage flywheel. A second housing is connected to the outside of a first housing and forms a first receiving cavity with the first housing. The second housing has a ventilation opening. The flywheel rotor is located inside the first housing, and the motor rotor is connected to the outer periphery of the flywheel rotor. The motor stator is located inside the first receiving cavity and surrounds the outer periphery of the motor rotor. Thus, the heat generated by the motor stator can be quickly dissipated to the outside through the ventilation opening. Compared with the motor stator and flywheel rotor being arranged in the same space, the heat transfer from the motor stator to the space where the flywheel rotor is located is reduced, thereby improving the heat dissipation efficiency of the flywheel rotor in a vacuum environment. Moreover, compared with the related technology where the motor assembly and flywheel rotor are arranged in different spaces, the motor rotor of the energy storage flywheel in this application is still located on the flywheel rotor, and the position of the motor stator relative to the flywheel rotor remains unchanged. The motor assembly can directly drive the flywheel rotor to rotate. The energy storage flywheel is small in size and does not require transmission components such as magnetic couplings. It has fewer parts, the flywheel rotor responds quickly, and the energy storage flywheel has good performance and low cost.

[0008] In some embodiments, the vent includes an upper vent and a lower vent, the upper vent and the lower vent being located on opposite sides of the motor stator along the length of the flywheel rotor.

[0009] In some embodiments, the inner circumferential surface of the motor stator and the outer circumferential surface of the first housing form a first airflow channel in the radial direction of the flywheel rotor.

[0010] In some embodiments, the first housing includes a main body and an outer casing, a portion of the flywheel rotor is located inside the main body, another portion of the flywheel rotor extends into the outer casing, the motor rotor is disposed inside the outer casing, and the outer casing is made of a non-magnetic composite material.

[0011] In some embodiments, the portion of the flywheel rotor located within the outer casing has a cavity extending along its length, and a portion of the outer casing fits into the cavity.

[0012] In some embodiments, a portion of the second housing fits within the cavity, and the outer wall surface of the portion of the second housing located within the cavity and the inner wall surface of the portion of the outer casing located within the cavity form a second airflow channel, the second airflow channel communicating with the first airflow channel.

[0013] In some embodiments, the portion of the second housing located within the cavity has an air duct extending along the length direction of the flywheel rotor, with openings at both ends of the air duct.

[0014] In some embodiments, the energy storage flywheel, which has a vacuum environment inside, further includes a fan, which is connected to the second housing and located at one end of the air duct away from the bottom wall of the cavity.

[0015] In some embodiments, the energy storage flywheel with an internal vacuum environment further includes a third housing, which is connected to the outside of the second housing and forms a second receiving cavity with the second housing. The end of the air duct away from the bottom wall of the cavity is connected to the second receiving cavity. The fan is disposed in the second receiving cavity, and a plurality of ventilation grilles connected to the second receiving cavity are provided on the outer peripheral surface of the third housing.

[0016] The energy storage device of this invention includes the energy storage flywheel with an internal vacuum environment as described in the above embodiments.

[0017] The energy storage device of this invention, by employing the aforementioned energy storage flywheel with an internal vacuum environment, exhibits good heat dissipation and excellent performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an energy storage flywheel with an internal vacuum environment according to an embodiment of the present invention.

[0019] Figure 2 This is a cross-sectional view of an energy storage flywheel with an internal vacuum environment according to an embodiment of the present invention.

[0020] Figure 3 This is a partially enlarged cross-sectional view of an energy storage flywheel with an internal vacuum environment according to an embodiment of the present invention.

[0021] Figure label:

[0022] First housing 1, body 11, outer casing 12, second housing 2, first airflow channel 21, second airflow channel 22, air duct 23, vent 24, third housing 3, flywheel rotor 4, motor rotor 5, silicon steel sheet 51, magnet 52, carbon fiber sleeve 53, motor stator 6, fan 7, axial magnetic bearing 8, radial magnetic bearing 9. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] like Figures 1-3 As shown, the energy storage flywheel with an internal vacuum environment in this embodiment of the invention includes a first housing 1, a flywheel rotor 4, a second housing 2, and a motor assembly.

[0025] like Figures 1-3 As shown, the first housing 1 is a vacuum inside and the flywheel rotor 4 is located inside the first housing 1. The second housing 2 is connected to the outside of the first housing 1 and forms a first receiving cavity with the first housing 1. The motor assembly includes a motor rotor 5 and a motor stator 6. The motor rotor 5 is located inside the first housing 1 and is arranged around the outer peripheral surface of the flywheel rotor 4. The motor stator 6 is located inside the first receiving cavity and surrounds the outer periphery of the motor rotor 5. The second housing 2 has a plurality of ventilation openings 24 that communicate with the first receiving cavity.

[0026] It is understandable that the motor stator 6 is located inside the second housing 2, and the heat generated by the motor stator 6 can be transferred to the outside through the second housing 2. Compared with the motor stator 6 and the flywheel rotor 4 being arranged in the same space, the heat transfer from the motor stator 6 to the space where the flywheel rotor 4 is located is reduced, thereby improving the heat dissipation efficiency of the flywheel rotor 4. In addition, the second housing 2 is provided with a vent 24, which can further utilize air for heat dissipation, allowing the motor stator 6 to quickly transfer heat to the outside, thereby reducing the temperature of the first receiving cavity, increasing the temperature difference between the inside and outside of the first housing 1, and further improving the heat dissipation efficiency of the flywheel rotor 4.

[0027] In this embodiment of the invention, the internal structure is a vacuum annular energy storage flywheel. A second housing 2 is connected to the outside of a first housing 1 and forms a first receiving cavity with the first housing 1. The second housing 2 has a ventilation opening 24. The flywheel rotor 4 is disposed inside the first housing 1. A motor rotor 5 is connected to the outer periphery of the flywheel rotor 4. A motor stator 6 is disposed within the first receiving cavity and surrounds the outer periphery of the motor rotor 5. Therefore, the heat generated by the motor stator 6 can be quickly dissipated to the outside through the ventilation opening 24. Compared to arranging the motor stator 6 and the flywheel rotor 4 in the same space, this design reduces the height of the motor stator 6. The heat transfer to the space where the flywheel rotor 4 is located can be improved, thereby increasing the heat dissipation efficiency of the flywheel rotor 4 in a vacuum environment. Compared with related technologies that arrange the motor assembly and the flywheel rotor 4 in different spaces, the motor rotor 5 of the energy storage flywheel in this application is still set on the flywheel rotor 4, and the position of the motor stator 6 relative to the flywheel rotor 4 remains unchanged. The motor assembly can directly drive the flywheel rotor 4 to rotate without the need for transmission components such as magnetic couplings. The number of parts is small, the size of the energy storage flywheel is small, the flywheel rotor 4 responds quickly, the energy storage flywheel has good performance, and the cost is low.

[0028] Optionally, such as Figures 1-3As shown, the motor rotor 5 includes a magnet 52 and a silicon steel sheet 51. The silicon steel sheet 51 is arranged around the outer periphery of the flywheel rotor 4, and a carbon fiber sleeve 53 is provided on the outer periphery of the silicon steel sheet 51. The magnet 52 is embedded in the silicon steel sheet 51.

[0029] Optionally, such as Figures 1-3 As shown, the ventilation opening 24 includes an upper ventilation opening and a lower ventilation opening, which are located on the motor stator 6 along the length of the flywheel rotor 4, respectively. Figures 1-3 The upper and lower vents can be considered as open ventilation channels, which facilitates high airflow within the second housing 2 and improves the heat dissipation efficiency of the motor stator 6.

[0030] Preferably, there can be multiple upper and lower vents. Multiple vents 24 can increase airflow and improve heat dissipation efficiency.

[0031] Preferably, such as Figures 1-3 As shown, multiple upper ventilation openings and multiple lower ventilation openings are arranged at intervals along the circumference of the second housing 2, which facilitates uniform heat dissipation at all positions of the motor stator 6, improves heat dissipation efficiency, and extends the service life of the motor assembly.

[0032] Optionally, such as Figures 1-3 As shown, the inner circumferential surface of the motor stator 6 and the outer circumferential surface of the first housing 1 form a first airflow channel 21 at a distance in the radial direction of the flywheel rotor 4. Therefore, the motor stator 6 does not contact the first housing 1, which can suppress heat transfer from the motor stator 6 to the first housing 1. Simultaneously, the airflow flowing along the first airflow channel 21 can directly exchange heat with the motor stator 6. The heat exchange area between the motor stator 6 and the airflow is large, resulting in high heat dissipation efficiency. Furthermore, the first airflow channel 21 can be combined with the upper and lower vents to form a circulating channel, allowing the airflow to flow rapidly along the circulating channel, further improving the heat dissipation effect.

[0033] Furthermore, such as Figures 1-3 As shown, the first housing 1 includes a main body and an outer casing 12. Part of the flywheel rotor 4 is located inside the main body, and another part of the flywheel rotor 4 extends into the outer casing 12. The motor rotor 5 is located inside the outer casing 12, which is made of ceramic material. It is understood that ceramic material is a non-magnetic material, which will not interfere with the magnetic field between the motor stator 6 and the motor rotor 5. Moreover, ceramic material has high structural strength and can be used for a long time.

[0034] Optionally, a heat-absorbing coating is provided on the inner side of the outer casing 12, which can further improve the heat radiation efficiency of the flywheel rotor 4 toward the outer casing 12.

[0035] Alternatively, the outer casing 12 can also be made of other non-magnetic materials, such as non-magnetic composite materials.

[0036] Optionally, the outer casing 12 and the main body 11 can be integrally formed.

[0037] Preferably, such as Figures 1-3 As shown, the portion of the flywheel rotor 4 located within the outer casing 12 has a cavity extending along its length, and a portion of the outer casing 12 fits within the cavity. It can be understood that by providing a cavity for the flywheel rotor 4 and having a portion of the outer casing 12 fit within the cavity, the heat transfer area of ​​the outer casing 12 available for the flywheel rotor 4 is increased, which helps to improve the heat dissipation efficiency of the flywheel rotor 4.

[0038] Furthermore, such as Figures 1-3 As shown, a portion of the second housing 2 fits within the cavity, and the outer wall surface of the portion of the second housing 2 located within the cavity and the inner wall surface of the portion of the outer casing 12 located within the cavity form a second airflow channel 22, which communicates with the first airflow channel 21. Specifically, as... Figures 1-3 As shown, the portion of the outer casing 12 opposite to the opening end of the cavity is spaced apart from the portion of the second casing 2 opposite to the opening end of the cavity. This space can connect the first airflow channel 21 and the second airflow channel 22.

[0039] Therefore, the airflow entering the first receiving cavity through the vent 24 can flow along the first airflow channel 21 and the second airflow channel 22. Both the first airflow channel 21 and the second airflow channel 22 directly exchange heat with the outer casing 12, resulting in a large heat exchange area. This facilitates the rapid removal of heat transferred from the flywheel rotor 4 toward the outer casing 12, increasing the temperature difference between the inside and outside of the outer casing 12 and improving the heat dissipation efficiency of the flywheel rotor 4.

[0040] Furthermore, such as Figures 1-3 As shown, the portion of the second housing 2 located within the cavity has an air duct 23 extending along the length of the flywheel rotor 4, with openings at both ends of the air duct 23. Thus, the air duct 23 communicates with the second airflow channel 22, and the first airflow channel 21, the second airflow channel 22, and the air duct 23 can form an airflow channel, increasing the length of the channel layout to further increase the heat exchange area between the second housing 2 and the air.

[0041] Furthermore, such as Figures 1-3 As shown, the energy storage flywheel also includes a fan 7, which is connected to the second housing 2 and located at one end of the air duct 23 away from the bottom wall of the cavity. Figures 1-3 (The upper end of the air duct 23). Thus, the fan 7 can provide suction at one end of the air duct 23 to increase the flow rate of air along the first airflow channel 21, the second airflow channel 22 and the air duct 23, thereby improving heat dissipation efficiency.

[0042] Furthermore, such as Figures 1-3As shown, the energy storage flywheel also includes a third housing 3, which is connected to the outside of the second housing 2 and forms a second receiving cavity with the second housing 2. One end of the air duct 23, away from the bottom wall of the cavity, communicates with the second receiving cavity. The fan 7 is located inside the second receiving cavity, and multiple ventilation grilles communicating with the second receiving cavity are provided on the outer circumferential surface of the third housing 3. Thus, the third housing 3 can protect and cover the fan 7, and the ventilation grilles can connect the air duct 23 to the outside.

[0043] Specifically, when the fan 7 is turned on, the external airflow flows into the second housing 2 through the vent 24, then enters the second airflow channel 22 along the first airflow channel 21, and then flows into the air duct 23 along the second airflow channel 22. The airflow in the air duct 23 flows into the third housing 3 through the top opening under the suction of the fan 7, and finally flows into the outside through the ventilation grille.

[0044] Furthermore, such as Figures 1-3 As shown, the energy storage flywheel also includes an axial magnetic bearing 8 and a radial magnetic bearing 9. Both the axial magnetic bearing 8 and the radial magnetic bearing 9 are disposed in the first housing 1. The axial magnetic bearing 8 is used to maintain the balance of the flywheel rotor 4 in the height direction. The radial magnetic bearing 9 includes two sets, and the two sets of radial magnetic bearing 9 are arranged at intervals in the height direction of the flywheel rotor 4. The two sets of radial magnetic bearing 9 are used to maintain the balance of the flywheel rotor 4 in the circumferential direction.

[0045] The energy storage device of this invention includes an energy storage flywheel with an internal vacuum environment as described in the above embodiments.

[0046] The energy storage device of this invention, by employing the aforementioned energy storage flywheel with an internal vacuum environment, exhibits good heat dissipation and excellent performance.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. An energy storage flywheel with an internal vacuum environment, characterized in that, include: A first housing and a flywheel rotor, wherein the interior of the first housing is a vacuum and the flywheel rotor is disposed inside the first housing; A second housing and a motor assembly are provided. The second housing is connected to the outside of the first housing and forms a first receiving cavity with the first housing. The motor assembly includes a motor rotor and a motor stator. The motor rotor is disposed inside the first housing and is arranged around the outer circumference of the flywheel rotor. The motor stator is disposed inside the first receiving cavity and surrounds the outer circumference of the motor rotor. The second housing has a plurality of ventilation openings communicating with the first receiving cavity. The ventilation openings include an upper ventilation opening and a lower ventilation opening. The upper ventilation opening and the lower ventilation opening are respectively located on both sides of the motor stator in the length direction of the flywheel rotor. The inner circumferential surface of the motor stator and the outer circumferential surface of the first housing form a first airflow channel in the radial direction of the flywheel rotor; the first housing includes a main body and an outer casing, a portion of the flywheel rotor is located inside the main body, another portion of the flywheel rotor extends into the outer casing, the motor rotor is disposed inside the outer casing, and the outer casing is made of non-magnetic composite material; the portion of the flywheel rotor located inside the outer casing has a cavity extending along its length direction, and a portion of the outer casing fits into the cavity; a portion of the second housing fits into the cavity, and the outer wall surface of the portion of the second housing located inside the cavity and the inner wall surface of the portion of the outer casing located inside the cavity form a second airflow channel, which communicates with the first airflow channel.

2. The energy storage flywheel with an internal vacuum environment as described in claim 1, characterized in that, The portion of the second housing located within the cavity has an air duct extending along the length of the flywheel rotor, with openings at both ends of the air duct.

3. The energy storage flywheel with an internal vacuum environment according to claim 2, characterized in that, It also includes a fan, which is connected to the second housing and located at one end of the air duct away from the bottom wall of the cavity.

4. The energy storage flywheel with an internal vacuum environment as described in claim 3, characterized in that, It also includes a third housing, which is connected to the outside of the second housing and forms a second receiving cavity with the second housing. One end of the air duct away from the bottom wall of the cavity is connected to the second receiving cavity. The fan is located in the second receiving cavity, and the outer peripheral surface of the third housing is provided with a plurality of ventilation grilles that are connected to the second receiving cavity.

5. An energy storage device, characterized in that, Includes an energy storage flywheel with an internal vacuum environment according to any one of claims 1-4.

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