WO2021019917A1

WO2021019917A1 - Vehicle-mounted wind-powered electricity generating device

Info

Publication number: WO2021019917A1
Application number: PCT/JP2020/022635
Authority: WO
Inventors: 浩威西野; 修平金原; 聡畑原; 智彰中野
Original assignee: ミネベアミツミ株式会社
Priority date: 2019-07-26
Filing date: 2020-06-09
Publication date: 2021-02-04
Also published as: JP2021023027A

Abstract

A vehicle-mounted wind-powered electricity generating device (1) which is mounted in a vehicle (100) to generate electricity using an airflow that arises when the vehicle travels is provided with a rotational force generating unit (10), an accommodating unit (20) which is provided in the vehicle (100) and which forms a space for rotatably accommodating the rotational force generating unit (10), and an electricity generating unit (30) which is connected to the rotational force generating unit (10), wherein: the rotational force generating unit (10) includes a shaft (11) which is rotatably supported in the accommodating unit (20), and at least one wind receiving machine (12) formed in such a way as to be subjected to the airflow and to transmit a rotational force to the shaft (11); the accommodating unit (20) includes an inflow port (21) which opens into a space (S) from a lower surface (101) of the vehicle, the lower surface (101) facing a travel surface (G) for the vehicle (100), and the space (S) being formed between the lower surface (101) and the and the travel surface (G); and such a configuration makes it possible to suppress the occurrence of variability in the rotational force of the wind receiving machine.

Description

In-vehicle wind power generator

The present invention relates to an in-vehicle wind power generator that is mounted on a vehicle and generates power by using the running wind when the vehicle is running.

Conventionally, an in-vehicle wind power generator that is mounted on a vehicle and generates power by using the running wind when the vehicle is running has been proposed (see, for example, Patent Document 1). In the wind power generator described in Patent Document 1, a wide pipe extends in the front-rear direction between two front wheels on the lower side of the front wheel axle of the automobile, and is inside the pipe from an inflow port that opens in front of the front of the automobile. The running wind can flow into the car. The running wind that has flowed into the pipe flows backward and hits the blade, which is a receiver, and pushes the blade to rotate the shaft. Then, the rotational force of the blade is transmitted to the dynamo connected to the shaft, and the dynamo generates electricity.

Japanese Unexamined Patent Publication No. 2001-180397

In a conventional in-vehicle wind power generator such as the wind power generator described in Patent Document 1, when the flow velocity of the airflow that hits each of the plurality of blades provided on the shaft varies, the plurality of blades transmit to each shaft. There is a variation between the rotational forces. Some of these rotational forces are smaller than the desired magnitude, in which case the total rotational force transmitted from the plurality of blades to the shaft is less than the desired magnitude, reducing the efficiency of power generation. ..

As described above, in the conventional in-vehicle wind power generation device, there was a case where efficient power generation could not be performed against the running wind. For this reason, in order to enable more efficient power generation with respect to the conventional in-vehicle wind power generation device, a structure capable of suppressing variation in the flow velocity of the airflow guided to the blade is provided. I was asked.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an in-vehicle wind power generator capable of suppressing variation in the flow velocity of an air flow guided to a wind receiver. ..

In order to achieve the above object, the in-vehicle wind power generation device according to the present invention is an in-vehicle wind power generation device mounted on a vehicle and generating power by using the running wind when the vehicle is running, and is a rotational force generating unit. A housing unit provided in the vehicle for forming a space for rotatably accommodating the rotational force generation unit and a power generation unit connected to the rotational force generation unit are provided, and the rotational force generation unit is the said. The accommodating portion has a shaft rotatably supported around an axis and at least one wind receiver formed to receive an air flow and transmit a rotational force to the shaft, and the accommodating portion has the vehicle. It is characterized by having an inflow port that opens into the space from the lower surface of the vehicle that faces the traveling surface and forms a space between the traveling surface and the vehicle.

In the in-vehicle wind power generator according to one aspect of the present invention, the accommodating portion is provided in the rear overhang portion of the vehicle, and the inflow port opens from the lower surface of the vehicle in the rear overhang portion. It is provided on the front side of the vehicle with respect to the rotational force generating portion.

In the in-vehicle wind power generator according to one aspect of the present invention, the accommodating portion is provided in the wheelbase portion of the vehicle, and the inflow port is opened from the lower surface of the vehicle in the wheelbase portion. , It is provided on the front side of the vehicle with respect to the rotational force generating portion.

In the in-vehicle wind power generator according to one aspect of the present invention, the longitudinal direction of the inflow port extends along the width direction orthogonal to the front-rear direction of the vehicle.

In the in-vehicle wind power generator according to one aspect of the present invention, the axis of the shaft extends along the longitudinal direction of the inflow port.

According to the in-vehicle wind power generator according to the present invention, it is possible to suppress the occurrence of variation in the rotational force of the receiver.

It is a figure which shows the side surface of the vehicle which mounted on the vehicle-mounted wind power generation device for showing the schematic structure of the vehicle-mounted wind power generation device which concerns on 1st Embodiment of this invention. It is a conceptual diagram of the vehicle equipped with the vehicle-mounted wind power generation device for showing the schematic configuration of the vehicle-mounted wind power generation device according to the first embodiment of the present invention. It is a figure for showing the schematic structure of the rotational force generation part in the vehicle-mounted wind power generation apparatus shown in FIG. It is a figure which shows the side surface of the vehicle which mounted the vehicle-mounted wind power generation device for showing the schematic structure of the vehicle-mounted wind power generation device which concerns on the 2nd Embodiment of this invention. It is a conceptual diagram of the vehicle equipped with the vehicle-mounted wind power generation device for showing the schematic configuration of the vehicle-mounted wind power generation device according to the second embodiment of the present invention.

Hereinafter, the in-vehicle wind power generation device according to the embodiment of the present invention will be described with reference to the drawings.

1 and 2 are views showing a vehicle equipped with the in-vehicle wind power generation device 1 for showing a schematic configuration of the in-vehicle wind power generation device 1 according to the first embodiment of the present invention. Is a side view of this vehicle, and FIG. 2 is a conceptual view of this vehicle as viewed from the rear. As shown in FIGS. 1 and 2, the in-vehicle wind power generation device (hereinafter, also referred to as a wind power generation device) 1 according to the first embodiment of the present invention is mounted on a vehicle, and the airflow during traveling of the vehicle ( It is a wind power generator that uses running wind) to generate electricity. In the present embodiment, the wind power generation device 1 is mounted on the automobile 100 as a vehicle. The vehicle on which the wind power generation device 1 is mounted is not limited to an automobile.

The wind power generation device 1 includes a rotational force generating unit 10, an accommodating unit 20 provided in the automobile 100 that forms a space for rotatably accommodating the rotational force generating unit 10, and a power generation unit connected to the rotational force generating unit 10. It is provided with a unit 30. The rotational force generating unit 10 includes a shaft 11 rotatably supported around the axis x in the accommodating unit 20, and at least one wind receiver 12 formed so as to receive an air flow and transmit the rotational force to the shaft 11. doing. The accommodating portion 20 has an inflow port 21 that opens into the space S from the lower surface 101 of the automobile that faces the traveling surface G of the automobile 100 and forms a space S with the traveling surface G. Hereinafter, the configuration of the wind power generation device 1 will be specifically described.

FIG. 3 is a diagram for showing a specific example of the rotational force generating unit 10. As shown in FIG. 3, the wind receiver 12 of the rotational force generating unit 10 is, for example, a cross flow fan, and the cross flow fan 12 is supported by the shaft 11 and extends in the axis x direction. Specifically, a plurality of impellers 13 extending in the axis x direction are fixed to the shaft 11 to form a cross flow fan 12. A plurality of cross flow fans 12 may be provided on the shaft 11 side by side in the axis x direction.

As shown in FIG. 1, the accommodating portion 20 is provided in the rear overhang portion 102 of the automobile 100. The inflow port 21 is opened from the lower surface 101 of the automobile 100 at the rear overhang portion 102, and is provided on the front side of the automobile 100 with respect to the rotational force generating portion 10. The rear overhang portion 102 is a portion of the vehicle body of the automobile 100 that is cantilevered and is supported so as to extend to the rear side of the rear wheel 103 of the automobile 100.

The accommodating portion 20 has a casing 22 that forms a space that can accommodate the cross flow fan 12. In the automobile 100, the cross flow fan 12 is rotatably supported around the axis x via the shaft 11 in the casing 22. Further, the axis x extends parallel to or substantially parallel to the width direction, which is a direction orthogonal to the front-rear direction (hereinafter, also simply referred to as the front-back direction) of the automobile 100. The axis x may extend at an angle with respect to the width direction of the automobile 100. The width direction of the automobile 100 is a direction that defines the width of the automobile 100.

Further, the accommodating portion 20 includes an inflow pipe portion 23 that forms an airflow passage between the casing 22 and the inflow port 21, and an outlet pipe portion that extends from the casing 22 and forms an airflow passage that opens to the rear of the automobile 100. It has 24 and. The inflow pipe portion 23 communicates with the inside of the casing 22, and in the casing 22 and the inflow pipe portion 23, the airflow flowing in from the inflow port 21 flows into the cross flow fan 12 so that the cross flow fan 12 rotates in a predetermined rotation direction. It is formed so that it can be sprayed on. Further, the casing 22 and the blowout pipe portion 24 are formed so as to blow out the airflow discharged from the rotating cross-flow fan 12 from the rear portion of the automobile 100.

The inflow pipe portion 23 has a shape such that an air flow is blown to the cross flow fan 12 over the entire width of the cross flow fan 12 in the axis x direction. For example, the width of the connection portion of the inflow pipe portion 23 with the casing 22 in the axis x direction is the same as or larger than the width of the cross flow fan 12 in the axis x direction. The inflow pipe portion 23 may be shaped so that the airflow is blown to the crossflow fan 12 at a part of the width of the crossflow fan 12 in the axis x direction.

The width of the inflow pipe portion 23 in the axis x direction is uniform in the extension direction of the inflow pipe portion 23. The extension direction of the inflow pipe portion 23 is a direction in which the inflow pipe portion 23 extends between the inflow port 21 and the connection portion between the inflow pipe portion 23 and the casing 22. The width of the inflow pipe portion 23 in the axis x direction does not have to be uniform in the extension direction of the inflow pipe portion 23. For example, the width of the inflow pipe portion 23 in the axis x direction may become smaller as it approaches the casing 22. Further, the width of the inflow pipe portion 23 in the front-rear direction of the automobile 100 is not uniform in the extending direction of the inflow pipe portion 23, and becomes smaller as it approaches the casing 22, for example. The width of the inflow pipe portion 23 in the front-rear direction may be uniform in the extending direction of the inflow pipe portion 23, or may be increased as it approaches the casing 22. Further, the shape of the cross section orthogonal to the extending direction of the inflow pipe portion 23 is, for example, a shape similar to or substantially similar to the shape of the inflow port 21. The shape of the cross section orthogonal to the extending direction of the inflow pipe portion 23 may be another shape. The shape of the inflow pipe portion 23 is preferably a shape that allows the air flow to flow inside the inflow pipe portion 23 at a uniform flow velocity.

As shown in FIG. 2, the inflow port 21 extends in the width direction of the automobile 100 and has a shape having a longitudinal direction L. The inflow port 21 is, for example, a rectangle or a substantially rectangular shape. The longitudinal direction L of the inflow port 21 extends along the axis x direction of the shaft 11. For example, the longitudinal direction L of the inflow port 21 extends parallel to or substantially parallel to the axis x direction of the shaft 11. The shape of the inflow port 21 is not limited to the above-mentioned shape, and may be another shape. Further, the longitudinal direction L of the inflow port 21 may be inclined with respect to the axis x.

As shown in FIGS. 2 and 3, the power generation unit 30 is connected to the shaft 11 holding the cross flow fan 12, and the rotational force of the shaft 11 is input. The power generation unit 30 is, for example, a generator such as an alternator or a dynamo, and can generate power by using the rotational force input from the shaft 11. The power generation unit 30 may be directly connected to the shaft 11 or may be connected via a transmission member such as a gear.

Next, the operation of the wind power generation device 1 having the above configuration will be described.

When the car 100 runs, a running wind is generated. The traveling wind is an air flow that flows along the automobile 100 toward the opposite side in the traveling direction. The traveling wind includes an air flow flowing along the lower surface 101 of the vehicle body and an air flow flowing along the upper surface 108 of the vehicle body. The airflow F flowing in from the front overhang portion 104 at the front portion of the vehicle body flows through the space S formed between the lower surface 101 of the wheelbase portion 105 and the ground G which is the traveling surface G, and the lower surface 101 of the wheelbase portion 105. And flows backward along the lower surface 101 of the rear overhang portion 102. A part of the airflow F flowing along the lower surface 101 of the rear overhang portion 102 flows into the inflow port 21 that opens into the space S from the lower surface 101 of the rear overhang portion 102. The airflow F flowing in from the inflow port 21 is guided by the inflow pipe portion 23 and the casing 22 and blown onto the impeller 13 which is a part of the cross flow fan 12, the cross flow fan 12 rotates, and the shaft 11 rotates. Since the shaft 11 is coupled to, for example, a rotor (not shown) of the power generation unit 30, the rotational force of the shaft 11 is transmitted to the rotor, the rotor rotates, and the power generation unit 30 generates power. The power generation unit 30 is electrically connected to, for example, the battery 106 mounted on the automobile 100, and the generated electricity is appropriately charged to the battery 106. The air blown to the cross-flow fan 12 is guided to the blow-out pipe portion 24 as the cross-flow fan 12 rotates, passes through the blow-out pipe portion 24, and flows from the air outlet 24a formed at the rear of the automobile 100 to the outside of the vehicle body. It is blown out.

Since a space S having a predetermined width is formed between the lower surface 101 of the automobile 100 and the ground G, the flow velocity of the airflow flowing through the lower surface 101 is faster than the flow velocity of the airflow flowing along the upper surface 108 of the vehicle body. The airflow F flowing rearward along the lower surface 101 is blown out of the vehicle body from the diffuser portion 107 arranged at the rear end of the rear overhang portion 102. Since the lower surface 101 of the wheelbase portion 105 and the rear overhang portion 102 has a structure that is flat, there is little variation in the flow velocity of the air flow F flowing along the lower surface 101 in the width direction, and the air flow F is It is blown out of the vehicle body without peeling from the lower surface 101 and the diffuser portion 107. Therefore, the flow velocity of the airflow F flowing along the lower surface 101 of the wheelbase portion 105 and the rear overhang portion 102 is higher than the flow velocity of the airflow flowing along the other outer surface of the vehicle body.

As described above, the airflow F flowing along the lower surface 101 of the wheelbase portion 105 and the rear overhang portion 102 is an airflow with little variation in the width direction of the automobile 100. Therefore, the airflow F flowing into the inflow port 21 from the lower surface 101 of the rear overhang portion 102 is also an airflow with little variation in the flow velocity in the width direction of the automobile 100. Therefore, the flow velocity of the airflow F in the inflow pipe portion 23 is made uniform in the axis x direction, the variation in the axis x direction is small, and the airflow F blown to the cross flow fan 12 is generated. It is possible to make the airflow with little variation in the axis x width direction of the flow velocity. Therefore, it is possible to suppress the variation of the force of the airflow F pushing the impeller 13 of the cross flow fan 12 in the axis x direction, and to push the impeller 13 uniformly with a desired force in the axis x direction. , The airflow F can be efficiently used for the rotation of the power generation unit 30. This makes it possible to efficiently generate electricity using the air flow F, which is a running wind.

Further, the airflow F flowing along the lower surface 101 of the wheelbase portion 105 and the rear overhang portion 102 becomes faster than the other running winds, so that the crossflow fan 12 can blow the airflow F having a high flow velocity. .. As a result, the cross flow fan 12 can be rotated at a higher speed, a stronger rotational force can be input to the power generation unit 30, and more efficient power generation can be performed using the air flow F which is a running wind. Can be.

It is easier to obtain a structure in which the lower surface of the vehicle body, especially the lower surface of the wheelbase, of an electric vehicle is entirely flattened as compared with a vehicle using an internal combustion engine as a prime mover. Further, since it is not necessary to provide a muffler for an electric vehicle, it is easy to obtain a structure in which the lower surface of the rear overhang portion is also completely flattened. Therefore, in the electric vehicle, the wind power generation device 1 can generate more efficient power generation, and the wind power generation device 1 can be more preferably used in the electric vehicle. Further, when the wind power generation device 1 is used for an electric vehicle, the power generation of the wind power generation device 1 can be used to replenish the electric power of the motor of the electric vehicle.

Further, when traveling on a flat road or a road capable of high-speed traveling, the wind power generation device 1 can generate more efficient power generation, and the wind power generation device 1 is capable of flat road or high-speed traveling. It can be used more preferably when traveling on a road.

As described above, according to the wind power generation device 1 according to the first embodiment of the present invention, it is possible to suppress the occurrence of variation in the flow velocity of the airflow F guided to the cross flow fan 12.

Next, the wind power generation device 2 according to the second embodiment of the present invention will be described. 4 and 5 are views showing a vehicle equipped with the in-vehicle wind power generation device 2 for showing a schematic configuration of the in-vehicle wind power generation device 2 according to the second embodiment of the present invention. Is a side view of this vehicle, and FIG. 5 is a conceptual view of this vehicle as viewed from the rear. The wind power generation device 2 is different from the wind power generation device 1 in the mounting positions of the rotational force generating unit 10, the accommodating unit 20, and the power generation unit 30 on the automobile 100. Hereinafter, with respect to the wind power generation device 2, the same components as those of the wind power generation device 1 according to the first embodiment of the present invention or the configurations having similar functions are designated by the same reference numerals and the description thereof will be omitted. And the different configurations will be explained.

As shown in FIG. 4, the wind power generation device 2 is provided in the wheelbase portion 105 of the automobile 100, and is provided, for example, in the rear portion of the wheelbase portion 105. Specifically, the accommodating portion 20 is provided in a portion on the rear side of the wheelbase portion 105, and the inflow port 21 is opened from the lower surface 101 of the automobile 100 in the wheelbase portion 105 to generate a rotational force. It is provided on the front side of the automobile 100 rather than the 10. The wheelbase portion 105 is a portion of the vehicle body of the automobile 100 between the rear wheels 103 and the front wheels 109. The outlet pipe portion 24 extending rearward from the casing 22 of the accommodating portion 20 extends beyond the rear wheels 103 to the outlet 24a at the rear of the automobile 100.

Next, the operation of the wind power generation device 2 having the above configuration will be described.

When the automobile 100 travels, a traveling wind is generated, and the airflow F flowing in from the front overhang portion 104 flows through the space S between the lower surface 101 and the traveling surface G, and is blown out from the diffuser portion 107 to the outside of the vehicle body. A part of the airflow F flowing along the lower surface 101 of the wheelbase portion 105 flows into the inflow port 21 that opens into the space S from the lower surface 101 of the wheelbase portion 105. The airflow F flowing in from the inflow port 21 is guided by the inflow pipe portion 23 and the casing 22 and blown onto the impeller 13 of a part of the cross flow fan 12, the cross flow fan 12 rotates, the shaft 11 rotates, and the shaft The rotational force of 11 is transmitted to the rotor, the rotor rotates, and the power generation unit 30 generates power.

As described above, the airflow F flowing along the lower surface 101 of the wheelbase portion 105 is an airflow with little variation in the flow velocity in the width direction of the automobile 100. Therefore, the airflow F flowing into the inflow port 21 from the lower surface 101 of the wheelbase portion 105 is also an airflow with little variation in the flow velocity in the width direction of the automobile 100. Therefore, in the wind power generation device 2 as well as the wind power generation device 1, the flow velocity of the airflow F in the inflow pipe portion 23 is made uniform in the axis x direction, and the variation in the axis x direction is reduced. Therefore, the airflow F blown to the cross flow fan 12 can be an airflow with little variation in the axis x width direction of the flow velocity. Therefore, it is possible to suppress the variation of the force of the airflow F pushing the impeller 13 of the cross flow fan 12 in the axis x direction, and to push the impeller 13 uniformly with a desired force in the axis x direction. , The airflow F can be efficiently used for the rotation of the power generation unit 30. This makes it possible to efficiently generate electricity using the air flow F, which is a running wind.

Further, the airflow F flowing along the lower surface 101 of the wheelbase portion 105 becomes faster than the other running winds. Therefore, in the wind power generation device 2 as well as the wind power generation device 1, the flow velocity is faster due to the cross flow fan 12. Airflow F can be blown. As a result, the cross flow fan 12 can be rotated at a higher speed, a stronger rotational force can be input to the power generation unit 30, and more efficient power generation can be performed using the air flow F which is a running wind. Can be.

As described above, according to the wind power generation device 2 according to the second embodiment of the present invention, it is possible to suppress the occurrence of variation in the flow velocity of the airflow F guided to the cross flow fan 12.

Similar to the wind power generation device 1, the wind power generation device 2 can also generate more efficient power generation in the electric vehicle, and the wind power generation device 2 can be more preferably used in the electric vehicle. Further, like the wind power generation device 1, the wind power generation device 2 can generate more efficient power when traveling on a flat road or a road capable of high-speed traveling, and the wind power generation device 2 is flat. It can be more preferably used when traveling on a road or a road capable of high-speed traveling.

Although the embodiment of the present invention has been described above, the present invention is not limited to the wind power generators 1 and 2 according to the embodiment of the present invention, and is included in the concept and claims of the present invention. Including all aspects. In addition, each configuration may be selectively combined as appropriate so as to achieve at least a part of the above-mentioned problems and effects. For example, the shape, material, arrangement, size, etc. of each configuration in the above embodiment can be appropriately changed depending on the specific usage mode of the present invention.

For example, the rotational force generating unit 10 assumes that the cross flow fan 12 is used as the wind receiver, but the wind fan is not limited to the cross flow fan 12. The receiver may be another fan such as a sirocco fan or a turbo fan, and may be any fan as long as it generates a rotational force for rotating the shaft 11 by blowing the airflow F flowing in from the inflow port 21.

Further, the wind power generation device according to the present invention may have a control device for controlling the amount of power generated by the power generation unit. As such a control device, for example, there is one that can control the rotation speed (rotational force) of the receiver. Specifically, as such a control device, there is a shutter capable of changing and controlling the opening area of the inflow port 21 according to the charging status of the battery 106 and the air volume of the airflow F blown to the cross flow fan 12. With this shutter, the amount of air flowing in from the inflow port 21 can be controlled according to the external environment and the vehicle speed, effective power generation can be performed, and the battery 106 can be efficiently charged. In addition, damage to the cross flow fan 12 can be prevented.

Further, in the wind power generation device 1, the inflow port 21 may open to the space S from the lower surface 101 of the wheelbase portion 105.

1,2 ... In-vehicle wind power generator, 10 ... Rotational force generator, 11 ... Shaft, 12 ... Blower, 13 ... Impeller, 20 ... Containment part, 21 ... Inflow port, 22 ... Casing, 23 ... Inflow pipe part, 24 ... Outlet pipe part, 24a ... Outlet, 30 ... Power generation part, 100 ... Automobile, 101 ... Bottom surface, 102 ... Rear overhang part, 103 ... Rear wheel, 104 ... Front overhang part, 105 ... Wheelbase part, 106 ... Battery, 107 ... Diffuser part, 108 ... Top surface, 109 ... Front wheel, F ... Airflow, G ... Running surface, L ... Longitudinal direction, S ... Space, x ... Axle

Claims

It is an in-vehicle wind power generator that is mounted on a vehicle and generates electricity by using the running wind when the vehicle is running.
Rotating force generator and
An accommodating portion provided in the vehicle that forms a space for rotatably accommodating the rotational force generating portion,
A power generation unit connected to the rotational force generating unit is provided.
The rotational force generating portion includes a shaft rotatably supported around an axis in the accommodating portion, and at least one wind receiver formed so as to receive an air flow and transmit the rotational force to the shaft. ,
The accommodating portion is characterized by having an inflow port that opens into the space from the lower surface of the vehicle that faces the traveling surface of the vehicle and forms a space between the accommodating portion and the traveling surface. Power generator.
The accommodating portion is provided in the rear overhang portion of the vehicle.
The vehicle-mounted wind power according to claim 1, wherein the inflow port is opened from the lower surface of the vehicle at the rear overhang portion and is provided on the front side of the vehicle with respect to the rotational force generating portion. Power generator.
The accommodating portion is provided on the wheelbase portion of the vehicle.
The vehicle-mounted wind power generation according to claim 1, wherein the inflow port is opened from the lower surface of the vehicle at the wheelbase portion and is provided on the front side of the vehicle with respect to the rotational force generating portion. apparatus.
The vehicle-mounted wind power generator according to any one of claims 1 to 3, wherein the longitudinal direction of the inflow port extends along a width direction orthogonal to the front-rear direction of the vehicle.
The vehicle-mounted wind power generator according to claim 4, wherein the axis of the shaft extends along the longitudinal direction of the inflow port.