Wind energy storage device and power plant

Abstract

The application provides a wind energy storage device and a power station. The wind energy storage device comprises a wind blade, a shell, a driving shaft, a driven shaft, a flywheel, a generator and a vacuum container. The shell has a mounting cavity. The driving shaft is rotatably arranged on the shell. A first end of the driving shaft is located outside the shell and connected with the wind blade so that the wind blade can drive the driving shaft to rotate. The driven shaft is rotatably arranged in the mounting cavity. The second end of the driving shaft and the driven shaft are both connected with a transmission device located in the mounting cavity. The driving shaft can drive the driven shaft to rotate through the transmission device. The flywheel is located in the mounting cavity and arranged on the driven shaft so that the flywheel can rotate with the driven shaft. The generator is connected with the driven shaft so that the driven shaft can drive the generator to generate electricity. The vacuum container has a vacuum cavity, and the flywheel is located in the vacuum cavity. Therefore, the wind energy storage device has the advantages of simple structure, low cost and small energy loss.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a wind energy storage device and a power station. BACKGROUND

[0002] With the increasing proportion of fluctuating and random power sources such as wind power and photovoltaic power, the importance of energy storage devices that can provide controllable and flexible resources for power grids is increasingly highlighted. Current energy storage technologies are diverse. According to the maturity of the technology, they can be divided into pumped storage and new energy storage. According to the use characteristics, they can be divided into power type and energy type. Flywheel energy storage is a device that converts electrical energy and flywheel kinetic energy. When there is excess power, the motor converts electrical energy into flywheel kinetic energy. When there is a power shortage, the generator converts kinetic energy into electrical energy. The flywheel energy storage device in the related art has high cost and high energy loss in the energy conversion process. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art. To this end, embodiments of the present application propose a wind energy storage device and a power station.

[0004] The wind energy storage device according to an embodiment of the present application comprises:

[0005] a fan blade;

[0006] a housing having a mounting cavity, the fan blade being located outside the housing;

[0007] a driving shaft rotatably arranged on the housing, a first end of the driving shaft being located outside the housing and connected to the fan blade so that the fan blade can drive the driving shaft to rotate, a second end of the driving shaft extending into the mounting cavity;

[0008] a driven shaft rotatably arranged in the mounting cavity, the second end of the driving shaft and the driven shaft being connected to a transmission device located in the mounting cavity, the driving shaft being able to drive the driven shaft to rotate through the transmission device;

[0009] a flywheel located in the mounting cavity, the flywheel being arranged on the driven shaft so that the flywheel can rotate with the driven shaft;

[0010] a generator connected to the driven shaft so that the driven shaft can drive the generator to generate electricity;

[0011] a vacuum container having a vacuum cavity, the flywheel being located in the vacuum cavity.

[0012] Therefore, the wind energy storage device according to an embodiment of the present application has the advantages of simple structure, low cost and low energy loss.

[0013] In some embodiments, the driving shaft is rotatably arranged on the housing through a first bearing;

[0014] The driven shaft is rotatably arranged on the housing through a second bearing.

[0015] In some embodiments, the first bearing and the second bearing are both magnetic suspension bearings;

[0016] The number of each of the first bearing and the second bearing is at least one.

[0017] In some embodiments, two ends of the driven shaft are respectively connected with a second bearing, and the transmission device, the flywheel and the generator are located between the two second bearings in the axial direction of the driven shaft.

[0018] The wind power energy storage device of the embodiments of the present application comprises

[0019] A first clutch, the driving shaft comprises a first segment and a second segment, the first segment and the second segment are connected through the first clutch, the fan blade is arranged on the first segment, and the second segment is connected with the transmission device;

[0020] A second clutch, the driven shaft comprises a third segment and a fourth segment, the third segment and the fourth segment are connected through the second clutch, the third segment is connected with the transmission device, the flywheel is arranged on the third segment, and the fourth segment is connected with the generator.

[0021] In some embodiments, at least one of the first bearing, the second bearing, the transmission device and the generator is located in the vacuum cavity.

[0022] In some embodiments, the vacuum cavity comprises a plurality of sub-cavities, the flywheel is located in a sub-cavity, and at least one of the first bearing, the second bearing, the transmission device and the generator is located in a corresponding sub-cavity.

[0023] In some embodiments, the housing constitutes the vacuum container, and the inner wall surface of the housing constitutes the wall surface of the vacuum cavity.

[0024] In some embodiments, the transmission device is a speed increaser.

[0025] The present application also provides a power station, comprising: a wind power energy storage device and a motor, the wind power energy storage device is the wind power energy storage device described above, and the motor is connected with the driving shaft or the driven shaft of the wind power energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1is a schematic view of a wind energy storage device according to an embodiment of the present application.

[0027] Reference signs:

[0028] a wind energy storage device 100;

[0029] a wind blade 1;

[0030] a housing 2, a mounting cavity 21;

[0031] a driving shaft 3, a first section 301, a second section 302, a first end 31, a second end 32, a first bearing 33, a first clutch 34;

[0032] a driven shaft 4, a third section 401, a fourth section 402, a second bearing 41, a second clutch 42;

[0033] a flywheel 5;

[0034] a generator 6;

[0035] a transmission device 7. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0037] A wind energy storage device 100 according to an embodiment of the present application is described below with reference to the accompanying drawings. As shown in Figure 1 the wind energy storage device 100 according to an embodiment of the present application includes a wind blade 1, a housing 2, a driving shaft 3, a driven shaft 4, a flywheel 5, a generator 6 and a vacuum container.

[0038] The housing 2 has a mounting cavity 21, and the wind blade 1 is located outside the housing 2. The driving shaft 3 is rotatably arranged on the housing 2, the first end 31 of the driving shaft 3 is located outside the housing 2 and connected with the wind blade 1 so that the wind blade 1 can drive the driving shaft 3 to rotate, and the second end 32 of the driving shaft 3 extends into the mounting cavity 21. The driven shaft 4 is rotatably arranged in the mounting cavity 21, and the second end 32 of the driving shaft 3 and the driven shaft 4 are both connected with a transmission device located in the mounting cavity 21, so that the driving shaft 3 can drive the driven shaft 4 to rotate through the transmission device.

[0039] The flywheel 5 is located in the mounting cavity 21, and the flywheel 5 is arranged on the driven shaft 4 so that the flywheel 5 can rotate with the driven shaft 4. The generator 6 is connected with the driven shaft 4 so that the driven shaft 4 can drive the generator 6 to generate electricity. The vacuum container has a vacuum cavity, and the flywheel 5 is located in the vacuum cavity.

[0040] The wind blade 1 of the wind energy storage device 100 according to the embodiment of the present application is driven by external wind force to rotate the driving shaft 3, the driving shaft 3 drives the driven shaft 4 through the transmission device to rotate the flywheel 5 and drive the generator 6 to generate electricity, and the excess energy can be stored by the rotating flywheel 5. When the rotating speed of the wind blade 1 is reduced, the flywheel 5 drives the generator 6 to generate electricity. The wind energy storage device 100 according to the embodiment of the present application has simple structure and low manufacturing cost.

[0041] The wind energy storage device 100 according to the embodiment of the present application is provided with a vacuum container, and the flywheel 5 is located in the vacuum cavity of the vacuum container. Thus, the flywheel 5 can be subjected to smaller resistance during rotation, thereby reducing the energy loss during rotation of the flywheel 5 to improve the energy storage efficiency and the amount of electricity generated.

[0042] Therefore, the wind energy storage device 100 according to the embodiment of the present application has the advantages of simple structure, low cost and small energy loss.

[0043] As shown in Figure 1 , the wind energy storage device 100 according to the embodiment of the present application comprises a wind blade 1, a housing 2, a driving shaft 3, a driven shaft 4, a first clutch 34, a second clutch 42, a flywheel 5, a generator 6 and a vacuum container.

[0044] The housing 2 has a mounting cavity 21, and the wind blade 1 is located outside the housing 2. For example, the wind blade 1 is located on the upper side of the housing 2.

[0045] The driving shaft 3 is rotatably arranged on the housing 2, the first end 31 of the driving shaft 3 is located outside the housing 2 and connected with the wind blade 1 so that the wind blade 1 can drive the driving shaft 3 to rotate, and the second end 32 of the driving shaft 3 extends into the mounting cavity 21. For example, the axial direction of the driving shaft 3 is the up-down direction, the first end 31 is located above the second end 32, and the up-down direction is indicated by the arrow in the figure.

[0046] As shown in Figure 1 , in some embodiments, the driving shaft comprises a first segment 301 and a second segment 302, the first segment 301 and the second segment 302 are connected through the first clutch 34, the wind blade 1 is arranged on the first segment 301, and the second segment 302 is connected with the transmission device. Thus, when the first clutch 34 is in the disengaged / engaged state, the first segment 301 and the second segment 302 will be disconnected / connected. When the rotating speed of the wind blade 1 is low or stopped, the first clutch 34 is in the disengaged state, so that the first segment 301 and the second segment 302 can be disconnected, thereby preventing the wind blade 1 from consuming the energy of the flywheel 5. For example, the first segment 301 is located above the second segment 302.

[0047] As shown in Figure 1As shown, the driven shaft 4 is rotatably disposed within the mounting cavity 21. Both the second end 32 of the driving shaft 3 and the driven shaft 4 are connected to a transmission device located within the mounting cavity 21. The driving shaft 3 can drive the driven shaft 4 to rotate via the transmission device. The axial direction of the driven shaft 4 is consistent with the axial direction of the driving shaft 3. For example, the axial direction of the driven shaft 4 is vertical.

[0048] The flywheel 5 is located inside the mounting cavity 21 and is mounted on the driven shaft 4 so that the flywheel 5 can rotate with the driven shaft 4. The generator 6 is connected to the driven shaft 4 so that the driven shaft 4 can drive the generator 6 to generate electricity. For example, the flywheel 5 is located above the generator 6, and the driven shaft 4, flywheel 5, and generator 6 are coaxially arranged.

[0049] In some embodiments, the transmission device is a speed increaser. This increases the rotational speed of the driven shaft 4, thereby facilitating power generation.

[0050] like Figure 1 As shown, in some embodiments, the driven shaft includes a third section 401 and a fourth section 402, which are connected by a second clutch 42. The third section 401 is connected to a transmission device, a flywheel is mounted on the third section 401, and the fourth section 402 is connected to a generator. Thus, when the second clutch 42 is in a disengaged / engaged state, the third section 401 and the fourth section 402 will be disengaged / engaged. This allows the second clutch 42 to be disengaged when power generation is not required, disconnecting the third section 401 and the fourth section 402, so that the flywheel 5 does not drive the generator 6 to generate electricity when it rotates. When power generation is required, the second clutch 42 is engaged, connecting the third section 401 and the fourth section 402, thereby driving the generator 6 to generate electricity. For example, the third section 401 is located above the fourth section 402, and both the first clutch 34 and the second clutch 42 are electromagnetic clutches.

[0051] like Figure 1 As shown, in some embodiments, the drive shaft 3 is rotatably mounted on the housing 2 via a first bearing 33, and the driven shaft 4 is rotatably mounted on the housing 2 via a second bearing 41. Both the first bearing 33 and the second bearing 41 are magnetic levitation bearings, thereby reducing energy loss when the drive shaft 3 and the driven shaft 4 rotate.

[0052] The number of each of the first bearing 33 and the second bearing 41 shall be at least one. The number of the first bearing 33 and the number of the second bearing 41 may be set as needed.

[0053] Specifically, the first bearing 33 is arranged in the mounting cavity 21, and the driving shaft 3 is connected with the rotor inside the first bearing 33. The two ends of the driven shaft 4 are respectively connected with a second bearing 41, and the transmission device 7, the flywheel 5 and the generator 6 are arranged between the two second bearings 41 in the axial direction of the driven shaft 4. For example, the first section 301 is connected with the rotor inside the first bearing 33, and the upper and lower ends of the driven shaft 4 are respectively connected with a second bearing 41, and the transmission device 7, the flywheel 5 and the generator 6 are arranged between the two second bearings 41 in the upper and lower directions.

[0054] The vacuum container has a vacuum cavity, and the flywheel 5 is arranged in the vacuum cavity. Thus, the energy loss of the flywheel 5 during rotation can be reduced.

[0055] In some embodiments, at least one of the first bearing 33, the second bearing 41, the transmission device and the generator 6 is arranged in the vacuum cavity. Thus, the energy loss of the corresponding one of the first bearing 33, the second bearing 41, the transmission device and the generator 6 can be reduced.

[0056] In some embodiments, the vacuum cavity includes a plurality of sub-cavities, the flywheel 5 is arranged in one sub-cavity, and at least one of the first bearing 33, the second bearing 41, the transmission device and the generator 6 is arranged in a corresponding sub-cavity. Specifically, the plurality of sub-cavities are arranged in a spaced manner. Thus, the devices in the mounting cavity 21 can be arranged in separate sub-cavities as needed, so as to facilitate the arrangement of the vacuum container. For example, the transmission device and the flywheel 5 are arranged in two sub-cavities.

[0057] In some embodiments, the shell 2 constitutes the vacuum container, and the inner wall surface of the shell 2 constitutes the wall surface of the vacuum cavity. That is, the first bearing 33, the second bearing 41, the transmission device and the generator 6 are all arranged in the vacuum cavity, so that the wind power energy storage device 100 has a smaller loss.

[0058] The wind blade 1, the flywheel 5 and the generator 6 of the wind power energy storage device 100 according to the embodiments of the present application are connected through electromagnetic clutches, and three energy transmission processes of the wind blade 1 and the flywheel 5, the flywheel 5 and the generator 6, and the wind blade 1, the flywheel 5 and the generator 6 can be realized. That is, when the first clutch 34 and the second clutch 42 are both in the disengaged state, the rotating flywheel 5 can store energy, the flywheel 5 stores energy, the rotational inertia of the generator 6 is increased, the impact of wind power change on the power grid frequency is greatly reduced, and the power grid is more friendly.

[0059] When the first clutch 34 is in the engaged state, the wind blade 1 can drive the flywheel 5 to rotate. When the first clutch 34 is in the engaged state, the flywheel 5 can drive the generator 6 to generate electricity. Thus, the use mode of the wind power energy storage device 100 according to the embodiments of the present application is more flexible, which is more conducive to meeting the peak regulation and frequency regulation demand of the power grid and improving the utilization rate of wind energy.

[0060] The application further provides a power station comprising the wind energy storage device 100 and a motor, the motor being connected to the driving shaft 3 or the driven shaft 4 of the wind energy storage device 100. For example, the motor is connected to the third section 401 of the driven shaft 4 of the wind energy storage device 100.

[0061] When the power is abundant, the second clutch 42 is in the disengaged state, and the third section 401 and the fourth section 402 are disconnected. After the first clutch 34 is disconnected, the wind blade 1 drives the flywheel 5 to rotate, so that the energy is stored in the flywheel 5, that is, the wind energy is converted into the kinetic energy of the flywheel 5. Alternatively, the power of the power station is consumed to drive the flywheel 5 to rotate, so that the electric energy of the power station is converted into the kinetic energy of the flywheel 5.

[0062] When the power is insufficient, the second clutch 42 is in the engaged state, so that the flywheel 5 drives the generator 6 to generate power. Thus, the power grid of the embodiment of the application can meet the demand of peak shaving and frequency modulation.

[0063] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0064] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0065] In the application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or in communication with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0066] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0067] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the terms "first", "second", "third", etc. are used herein merely as identifiers for different elements, regions, or layers, and are not intended to be taken literally, unless otherwise specified.

[0068] Although the above-mentioned embodiments have been shown and described, it is to be understood that these embodiments are exemplary only, and are not to be taken as limiting the scope of the present application, and that changes, modifications, substitutions and variations can be made to the above-mentioned embodiments by those skilled in the art without departing from the scope of the present application.

Claims

1. A wind power energy storage device, characterized in that, include: Wind blades; A housing having a mounting cavity, wherein the fan blade is located on the outside of the housing; A drive shaft is rotatably mounted on the housing. The first end of the drive shaft is located outside the housing and connected to the fan blade so that the fan blade can drive the drive shaft to rotate. The second end of the drive shaft extends into the mounting cavity. The driven shaft is rotatably disposed in the mounting cavity. The second end of the driving shaft and the driven shaft are both connected to a transmission device located in the mounting cavity. The driving shaft can drive the driven shaft to rotate through the transmission device. A flywheel is located within the mounting cavity and is mounted on the driven shaft so that the flywheel can rotate with the driven shaft. A generator, wherein the generator is connected to the driven shaft so that the driven shaft can drive the generator to generate electricity; A vacuum container having a vacuum chamber, wherein the flywheel is located within the vacuum chamber; The drive shaft is rotatably mounted on the housing via a first bearing; The driven shaft is rotatably mounted on the housing via a second bearing; The first clutch, the drive shaft includes a first section and a second section, the first section and the second section are connected by the first clutch, the fan blade is disposed on the first section, and the second section is connected to the transmission device; The second clutch, the driven shaft includes a third section and a fourth section, the third section and the fourth section are connected by the second clutch, the third section is connected to the transmission device, the flywheel is disposed on the third section, and the fourth section is connected to the generator; Both the first clutch and the second clutch are electromagnetic clutches.

2. The wind power energy storage device according to claim 1, characterized in that, Both the first bearing and the second bearing are magnetic levitation bearings; The number of each of the first bearing and the second bearing is at least one.

3. The wind power energy storage device according to claim 1, characterized in that, The driven shaft is connected to a second bearing at each end, and the transmission device, the flywheel and the generator are located axially between the two second bearings on the driven shaft.

4. The wind power energy storage device according to claim 3, characterized in that, At least one of the first bearing, the second bearing, the transmission device, and the generator is located inside the vacuum chamber.

5. The wind power energy storage device according to claim 4, characterized in that, The vacuum chamber includes multiple sub-cavities, with the flywheel located in one of the sub-cavities, and at least one of the first bearing, the second bearing, the transmission device, and the generator located in a corresponding sub-cavity.

6. The wind power energy storage device according to claim 4, characterized in that, The shell constitutes the vacuum container, and the inner wall surface of the shell constitutes the wall surface of the vacuum cavity.

7. The wind power energy storage device according to any one of claims 1-6, characterized in that, The transmission device is a speed increaser.

8. A power station, characterized in that, include: A wind energy storage device, wherein the wind energy storage device is the wind energy storage device according to any one of claims 1-7; An electric motor is connected to the drive shaft or driven shaft of the wind power energy storage device.

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