JP7320642B2 - Wind power generation system for mobile body and mobile body provided with the same - Google Patents

Description

The present invention relates to a wind power generation system for mobile bodies and a mobile body having the same.

2. Description of the Related Art In recent years, electric vehicles that run using electricity as an energy source have attracted attention. While electric vehicles have advantages such as not emitting exhaust gas while driving, they have problems such as a shorter cruising range than gasoline vehicles and a charging time of several hours.

In order to solve such problems, it has been proposed to attach a small wind power generator to an electric vehicle and charge the electric vehicle while driving using the wind force received while the vehicle is running. As such a wind power generator for an electric vehicle, for example, Patent Document 1 proposes a wind power generator using an impeller in which a plurality of small blades are arranged side by side on the surface of a truncated conical drum. Further, for example, Patent Literature 2 proposes a wind turbine generator using a spiral impeller.

JP 2010-101275 A JP 2017-149168 A

However, the wind turbine generator described in Patent Literature 1 is intended to generate power during high-speed travel. The impeller of Patent Document 1 has small blades and the blades are arranged along the axial direction, so the conversion efficiency from wind power to rotational energy is not sufficient. There was a problem that it was difficult to obtain a sufficient rotation speed of the impeller, and as a result, a sufficient amount of power generation could not be obtained.

Further, the wind power generator described in Patent Document 2 uses a spiral impeller to improve the conversion efficiency from wind power to rotational energy, but the durability is not sufficient. For example, there is a problem that the impeller is easily damaged because the force that the impeller receives from the air current is extremely large during high-speed running.

The present invention has been made in view of the above problems. That is, an object of the present invention is to provide a wind power generation system for a moving body that has high conversion efficiency from wind power to rotational energy and high durability.

The gist of the present invention is as follows.

[1] Equipped with a wind tunnel, an impeller disposed in the wind tunnel and having a hub and a plurality of blades, and a generator that generates electricity by rotation of the impeller, the hub moving from the front end side to the rear end side Each of the plurality of blades has a substantially conical portion or substantially truncated conical portion with an increasing diameter, and each of the plurality of blades extends from near the front end portion to near the rear end portion of the hub with respect to the generatrix of the substantially conical portion or substantially truncated conical portion. A wind power generation system for a moving object, formed obliquely at a predetermined angle.

[2] The above-mentioned [1], wherein the blade has a substantially triangular shape, and is formed such that a portion corresponding to the oblique side of the substantially triangular shape is in contact with the side surface of the substantially conical portion or the substantially truncated conical portion. A wind power generation system for mobile objects.

[3] When the impeller is cut by an arbitrary plane perpendicular to the rotation axis of the impeller, the length of the blade in the cross section is the radius of the bottom surface of the substantially conical portion or substantially truncated conical portion and the substantially conical portion or The wind power generation system for a moving body according to the above [1] or [2], which is substantially equal to the difference from the radius of the cross section of the substantially truncated cone portion.

[4] The wind power generation system for a moving object according to any one of [1] to [3] above, wherein the predetermined angle is 25 to 45 degrees.

[5] When focusing on any one blade, the one blade is formed without going around the side surface of the substantially conical portion or substantially truncated conical portion. A wind power generation system for a moving object according to any one of the above.

[6] The wind tunnel is between the front end and the rear end of the wind tunnel, and the wind that has flowed in from the front end of the wind tunnel to a position corresponding to the vicinity of the rear end of the impeller is exhausted to the outside of the wind tunnel. The wind power generation system for a moving body according to any one of [1] to [5] above, having an opening of .

[7] A moving object comprising the wind power generation system for a moving object according to any one of [1] to [6] above.

According to the wind power generation system of the present invention, the impeller has a hub and a plurality of blades, and the hub has a substantially conical portion or substantially truncated conical portion whose diameter increases from the front end side to the rear end side. and each of the plurality of blades is obliquely formed at a predetermined angle with respect to the generatrix of the substantially conical portion or the substantially truncated conical portion from near the front end portion to near the rear end portion of the hub, The efficiency of conversion from wind power to rotational energy by the impeller is high, and it is possible to obtain a sufficient amount of power generation even while traveling at low speed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows an example of the wind power generation system concerning embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows an example of the wind power generation system concerning embodiment of this invention. 1 is a partial cross-sectional view showing an example of a wind power generation system according to an embodiment of the present invention; FIG. 1 is a schematic diagram showing an intake and an exhaust of a wind power generation system according to an embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows an example of the impeller concerning embodiment of this invention. It is a mimetic diagram showing an example of an impeller concerning an embodiment of the invention.

Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to the drawings and the embodiments. Moreover, the present invention is not limited to the preferred numerical values and configurations described below.

As used herein, the term “axial direction” refers to a direction parallel to the rotation axis of the impeller. Moreover, "radial direction" refers to a direction perpendicular to the rotation axis of the impeller.

[Wind power generation system]
FIG. 1 is a front view showing an example of a wind power generation system according to an embodiment of the invention. FIG. 2 is a side view showing an example of the wind power generation system according to the embodiment of the present invention, and is a view when the wind power generation system shown in FIG. 1 is viewed from the side. FIG. 3 is a partial cross-sectional view showing an example of the wind power generation system according to the embodiment of the present invention, and is a schematic diagram showing the internal structure of the wind tunnel in the wind power generation system shown in FIG.

The wind power generation system shown in FIGS. 1 to 3 includes a substantially cylindrical wind tunnel 1 and a pedestal 2 that supports the wind tunnel 1 . Further, inside the wind tunnel 1, an impeller 5 having a hub 3 and blades 4, a gearbox 7, an output shaft 8, a generator 9, and a control device 10 are provided. In FIG. 3, the gearbox 7, the output shaft 8, the generator 9, and the control device 10 do not show their specific structures, but simply show their arrangement.

The wind tunnel 1 concentrates the wind in its interior and increases the speed of the wind that has flowed into it, thereby improving the amount of power generation and power generation efficiency. In addition, the wind tunnel 1 has a role of protecting the impeller 5, the generator 9, and other elements arranged inside the wind tunnel 1. As shown in FIG.

As shown in FIGS. 2 and 3, the wind tunnel 1 preferably includes a substantially cylindrical wind tunnel front portion 1a, a wind tunnel connecting portion 1b, and a substantially cylindrical wind tunnel rear portion 1c. The wind tunnel front part 1a and the wind tunnel rear part 1c are arranged with a predetermined gap therebetween, and the wind tunnel front part 1a and the wind tunnel rear part 1c are connected by the wind tunnel connection part 1b so as to form an opening between them. there is

A front end portion of the wind tunnel front portion 1a is an intake port. The wind tunnel front part 1a converges the relative airflow generated by the movement of the moving object inside the wind tunnel front part 1a, and accelerates the airflow that has flowed inside. As a result, it becomes possible to apply sufficient wind power to the impeller 5 provided inside, and to improve the amount of power generation and power generation efficiency. From the viewpoint of enhancing the airflow convergence effect, as shown in FIG. 3, it is preferable that the inner diameter of the wind tunnel front portion 1a is gradually reduced in the vicinity of the front end portion of the wind tunnel front portion 1a.

The wind tunnel connecting portion 1b is not particularly limited as long as it connects the wind tunnel front portion 1a and the wind tunnel rear portion 1c so as to form an opening between them. The opening is for discharging the air flow, rain, etc. that flowed into the inside of the wind tunnel 1 to the outside of the wind tunnel 1 .

FIG. 4 is a schematic diagram showing the intake and exhaust of the wind power generation system according to the embodiment of the present invention. The wind power generation system according to the present embodiment can suck airflow from the front end portion of the wind tunnel front portion 1a into the inside of the wind tunnel front portion 1a, and exhaust at least part of the sucked airflow from the opening. Therefore, it is possible to suppress airflow turbulence that may occur behind the impeller 5 in the wind tunnel 1, and as a result, it is possible to improve the power generation amount and the power generation efficiency. In addition, it is possible to reduce the airflow that collides with the gearbox 7, the generator 9, and the like arranged behind the opening. It is possible to prevent damage to things.

In addition, by providing the opening, for example, rain and dust that have entered the inside of the wind tunnel front portion 1a can be discharged to the outside of the wind tunnel 1. It is possible to reduce the possibility that things arranged behind are damaged by rain, dust, or the like. As described above, since the airflow blows out of the wind tunnel 1 from the opening, there is little possibility that rain or dust will enter the inside of the wind tunnel 1 from the opening.

The opening is preferably located near the rear end of the impeller 5 . The blade 4 according to the present embodiment is configured such that the front end portion of the impeller 5 has a large wind receiving area, and the wind receiving area decreases toward the rear end portion of the impeller 5 . Therefore, the airflow has a large effect on the rotation of the impeller 5 at the front end of the impeller 5 , but the airflow has little effect on the rotation of the impeller 5 at the rear end of the impeller 5 . Since the opening is located near the rear end of the impeller 5, it is possible to apply sufficient rotational energy to the impeller 5 and prevent damage to objects arranged behind the opening. Become.

The width of the opening, that is, the distance between the rear end of the wind tunnel front portion 1a and the front end of the wind tunnel rear portion 1c should be such that at least a portion of the air flow that has flowed into the wind tunnel front portion 1a can be exhausted. , is not particularly restricted.

A gearbox 7, an output shaft 8, a generator 9, and a control device 10 are arranged inside the wind tunnel rear portion 1c. The wind tunnel rear part 1c has a role of protecting things arranged inside. The shape and size of the wind tunnel rear portion 1c are not particularly limited, and can be appropriately determined according to the shape and size of the generator 9. For example, they may be different from the wind tunnel front portion 1a.

A pedestal 2 supports the wind tunnel 1 . The shape and size of the pedestal 2 are not particularly limited, and can be appropriately determined according to the type and size of the moving body and the position of attachment to the moving body.

The impeller 5 is arranged such that the vicinity of the rear end portion of the impeller 5 is arranged at a position corresponding to the opening of the wind tunnel 1, and other portions are arranged inside the wind tunnel front portion 1a. The impeller 5 includes a hub 3, a plurality of blades 4, and a rotating shaft.

The hub 3 has a substantially conical portion or substantially truncated conical portion whose diameter increases from the front end side to the rear end side of the hub 3 . Since the diameter of the front end portion of the hub 3 is small, the radial length of the blades 4 can be increased in the vicinity of the front end portion of the hub 3 . Therefore, the airflow received by the blades 4 can be efficiently converted into rotational energy, and, for example, even when moving at a low speed (for example, about 10 km / h), it is possible to obtain a sufficient amount of power generation.

Further, since the diameter of the rear end portion of the hub 3 is large, the size of the diameter near the rear end portion of the hub 3 is several times the length of the blades 4 in the radial direction. Therefore, the impeller 5 according to the present embodiment has sufficient strength and durability, and is less likely to be damaged, for example, even if it is subjected to strong air currents when moving at high speed.

The diameter of the bottom surface of the substantially conical portion or the substantially truncated conical portion of the hub 3 is not particularly limited, but from the viewpoint of efficiently converting the airflow that has flowed into the wind tunnel front portion 1a into rotational energy, for example, the wind tunnel It is preferably substantially equal to the inner diameter of the front portion 1a.

The rotation axis is provided on a line segment connecting the apex of the substantially conical portion and the center of the bottom circle, or on a line segment connecting the center of the top circle and the center of the bottom circle of the substantially truncated conical portion. there is The rotating shaft may be formed integrally with the hub 3 or may be formed independently of the hub 3 and fitted to the hub 3 . The rotating shaft rotates in conjunction with the rotation of the impeller 5 , and the rotation is input to the gearbox 7 .

Each of the plurality of blades 4 is obliquely formed at a predetermined angle with respect to the generatrix of the substantially conical portion or substantially truncated conical portion from the vicinity of the front end portion to the vicinity of the rear end portion of the hub 3, and It has a diameter (blade diameter) close to the inner diameter of the wind tunnel front portion 1a. With such a configuration, the wind receiving area of the blades 4 is increased, and almost all the airflow flowing into the wind tunnel front portion 1a can be received by any one of the plurality of blades 4, so that the impeller is sufficiently It is possible to give sufficient rotational energy and obtain sufficient rotational speed.

Although the predetermined angle is not particularly limited, it is preferably 25 degrees or more, and preferably 40 degrees or less. If the predetermined angle is less than 25 degrees, for example, collision between the blades 4 and the airflow becomes difficult, and the rotation speed of the impeller may decrease. Further, if the predetermined angle exceeds 40 degrees, for example, after the blades 4 collide with the airflow, the airflow is likely to be turbulent, and there is a risk that the rotation speed of the impeller will decrease.

In addition, the blades 4 may be formed in a so-called spiral shape such that the side surfaces of the substantially conical portion or the substantially truncated conical portion are circulated one or more times. From the viewpoint of making it difficult for disturbance to occur, it is preferable to form the side surface of the substantially conical portion or the substantially truncated conical portion without making one round.

In the front view shown in FIG. 1, each of the plurality of blades 4 radially extends from the vicinity of the front end of the hub 3 (the side surface of the substantially frustoconical portion near the upper surface) to the vicinity of the inner wall of the wind tunnel 1 . Since the blades 4 have a sufficient length near the front end of the hub 3, the air flow that has flowed into the wind tunnel front portion 1a can be efficiently converted into rotational energy.

The impeller according to the present embodiment will be further described below with reference to FIGS. 5 and 6. FIG. FIG. 5 is a perspective view showing an example of an impeller according to an embodiment of the present invention; FIG. 6 is a schematic diagram showing an example of an impeller according to an embodiment of the present invention, in which a part of the impeller is simplified for easy understanding. Therefore, although there are some parts that are not consistent with FIG. 5, it is correct to interpret the parts that are not consistent according to FIG.

The impeller 5 shown in FIGS. 5 and 6 includes a hub 3 having a substantially frustoconical portion, a plurality of blades 4 and a rotating shaft 6 . The hub 3 shown in FIG. 6 is a schematic cross-section of the hub 3 cut by a plane including a line segment connecting the center of the circle on the top surface of the truncated cone portion and the center of the circle on the bottom surface. It is. Also, only two blades 4 facing each other are shown in a simplified manner, and the other blades 4 are omitted. More precisely, the upper blade 4 in FIG. 6 is located on the back side of the figure at the front end of the impeller 5 and on the front side of the figure at the rear end of the impeller 5 . 6 is located on the front side of the figure at the front end of the impeller 5, and is located on the back side of the figure at the rear end of the impeller 5. As shown in FIG. Regarding the hub 3, the plurality of blades 4, the impeller 5, and the rotating shaft 6 shown in FIGS. 5 and 6, the contents described above with reference to FIGS. Description is omitted.

As shown in FIG. 5, it is preferable that the length of the blades 4 in the radial direction is long near the front end of the hub 3 and short near the rear end of the hub 3, for example. Further, when the impeller 5 is cut by an arbitrary plane perpendicular to the rotation axis of the impeller 5, the length of the blade 4 in the cross section is approximately the radius of the bottom surface of the substantially conical portion or substantially truncated conical portion It is preferably substantially equal to the difference in cross-sectional radius of the conical portion or substantially truncated conical portion. With such a configuration, the conversion efficiency from wind power to rotational energy can be further increased, and for example, even when the moving body moves at a low speed, it becomes possible to obtain a sufficient amount of power generation. .

From the same point of view, the shape of the blades 4 is preferably, for example, a substantially triangular shape, and more preferably a substantially right-angled triangular shape. When the shape of the blades 4 is substantially triangular or substantially right-angled triangular, it is preferable to configure the impeller 5 so that the portion corresponding to the oblique side and the side surface of the substantially conical portion or substantially truncated conical portion are in contact with each other.

Since the diameter near the rear end portion of the hub 3 is large, the space through which the airflow passes in the impeller 5 becomes small near the rear end portion of the hub 3, and the pressure of the airflow increases. By guiding the airflow to the opening provided in the wind tunnel 1 with the pressure of the airflow increased, the exhaust from the opening can be efficiently performed, and the airflow is arranged inside the rear part 1c of the wind tunnel. It is possible to reduce the possibility of breakage.

Returning to the description of FIG. The gearbox 7 is arranged between the impeller 5 and the generator 9 . The speed increaser 7 increases the rotation speed input from the rotating shaft (input shaft) 6 of the impeller 5 and transmits it to the generator 9 via the output shaft 8 . By providing the speed increaser 7, it is possible to obtain sufficient power generation amount and power generation efficiency even when the moving speed of the moving body is slow and the rotation speed of the impeller is insufficient. The gearbox 7 is not particularly limited, and conventionally known gearboxes can be appropriately employed depending on the amount of power generation required or the type of the generator 9, for example.

The generator 9 converts rotational energy transmitted through the output shaft 8 into electrical energy. The generator is not particularly limited, and for example, conventionally known generators can be appropriately employed according to the type of storage battery provided in the mobile object. The generator 9 may be a DC generator or an AC generator. For example, when the generated current is stored in a storage battery, a DC generator or an AC generator equipped with a rectifier (eg, an alternator) is used. preferable.

The electrical energy obtained by the generator 9 is stored in a storage battery (not shown) provided in the mobile body. The storage battery is not particularly limited, and conventionally known batteries such as lithium ion batteries and lead storage batteries can be used as appropriate. Also, a so-called all-solid battery may be used. When the moving object has a storage battery as a power source, it is preferable that the power is stored in the storage battery as the power source.

The control device 10 is electrically connected to the generator 9 via a cable or the like (not shown). The control device 10 performs control when the electrical energy obtained by the generator 9 is stored in the storage battery. For example, when the storage battery is a lithium ion battery, the control device 10 controls the output voltage to the storage battery so that overcharging does not occur. Note that the control device 10 may not be provided when control of the output voltage to the storage battery is unnecessary, such as when the storage battery is a lead-acid battery. The control device 10 may be provided, for example, in the vicinity of the storage battery instead of inside the wind tunnel rear portion 1c.

[Moving body]
Next, a moving body according to an embodiment of the present invention will be explained. A mobile means, for example, an object that can move on land, sea, or air at a predetermined speed (for example, 10 km/h) or higher that enables wind power generation. Specific examples of mobile objects include bicycles, motorcycles, automobiles, ships, and unmanned aerial vehicles (for example, drones).

The power source of the moving body is not particularly limited, and may be human power, gasoline, electric power, etc., but electric power is preferable. For example, in the case of a mobile object powered by electric power stored in a storage battery, the electric power consumed by movement can be compensated for by the electric power generated by the wind power generation system, so the cruising range can be extended. Specific examples of mobile objects powered by electric power include electric bicycles, electric motorcycles, electric vehicles, and drones. Note that even if the power source of the moving body is not electric power, the generated electric power can be stored in a storage battery and used for other purposes, which is useful.

The installation position of the wind power generation system is not particularly limited as long as it can receive relative air currents generated by movement. The installation position of the wind power generation system may be inside or outside the moving body, and may be determined as appropriate according to the type and size of the moving body. If the mobile object is an electric vehicle, for example, the location where aero parts such as a spoiler are installed, the inside of the hood, and the like. When installed under the hood, for example, it generates electricity by the airflow that flows in from the front grille. Alternatively, a dedicated mounting space may be provided in the body of the electric vehicle, and it may be embedded in the body in such a manner that the airflow can flow into the intake port of the wind power generation system. From the viewpoint of reducing the possibility of breakage, it is preferable to arrange it in the bonnet or embed it in the body.

The number of wind power generation systems attached to the mobile body is not particularly limited, and may be determined as appropriate according to the amount of power generation required. The wind power generation system according to the above-described embodiment is much smaller and lighter than wind power generators installed in conventional wind power plants. Even when attached, the weight burden on the moving body is small.

REFERENCE SIGNS LIST 1 wind tunnel 1a wind tunnel front portion 1b wind tunnel connection portion 1c wind tunnel rear portion 2 pedestal 3 hub 4 blades 5 impeller 6 rotating shaft (input shaft)
7 gearbox 8 output shaft 9 generator 10 control device

Claims (7)

a substantially cylindrical wind tunnel;
an impeller disposed in a wind tunnel and having a hub and a plurality of blades;
and a generator that generates power by rotating the impeller,
the hub has a substantially conical portion or a substantially truncated conical portion whose diameter increases from the front end side to the rear end side;
the bottom diameter of the substantially conical portion or the substantially truncated conical portion of the hub is substantially equal to the inner diameter of the wind tunnel in which the hub is located ;
Each of the plurality of blades is obliquely formed at a predetermined angle with respect to the generatrix of the substantially conical portion or substantially truncated conical portion from near the front end portion to near the rear end portion of the hub,
A wind power generation system for mobile objects. The blade has a substantially triangular shape, and is formed so that a portion corresponding to the oblique side of the substantially triangular shape and the side surface of the substantially conical portion or substantially truncated conical portion are in contact,
The wind power generation system for a moving object according to claim 1. When the impeller is cut by an arbitrary plane perpendicular to the axis of rotation of the impeller, the length of the blade in the cross section is the radius of the bottom surface of the substantially conical portion or substantially truncated conical portion and the substantially conical portion or substantially truncated conical portion. approximately equal to the difference from the radius of the section of the cone,
The wind power generation system for a moving object according to claim 1 or 2. the predetermined angle is between 25 and 45 degrees;
A wind power generation system for a moving body according to any one of claims 1 to 3. When focusing on any one blade, the one blade is formed without making one turn around the side surface of the substantially conical portion or substantially truncated conical portion.
A wind power generation system for a moving body according to any one of claims 1 to 4. The wind tunnel has an opening between the front end and the rear end of the wind tunnel and at a position corresponding to the vicinity of the rear end of the impeller for discharging the wind that has flowed in from the front end of the wind tunnel to the outside of the wind tunnel. has a
A wind power generation system for a moving body according to any one of claims 1 to 5. A moving object comprising the wind power generation system for a moving object according to any one of claims 1 to 6.

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