JP6130965B1 - Fluid machine, power generator and pressure booster - Google Patents

Abstract

A fluid machine that can be used for efficient and stable hydropower generation is provided. A rotor 2 comprising a shaft 21 and a spiral blade 22 fixed to the outer peripheral surface of the shaft 21 is disposed in a cylinder 1 and is pivotally supported. The shaft 21 of the rotor 2 has a spiral blade attachment portion 211 whose diameter increases toward the lower side, and the spiral blade 22 is fixed to the outer peripheral surface of the spiral blade attachment portion 211. The spiral blade 22 has a shape in which the pitch (interval between the blades) becomes narrower downward. A fluid inlet 14 is provided at the upper end of the cylinder 1, and the lower end of the cylinder 1 is sealed. A discharge path 15 that connects the inside and the outside of the cylinder 1 is provided in the vicinity of the closed lower end of the cylinder 1. [Selection] Figure 1

Description

  The present invention relates to a fluid machine particularly suitable for hydroelectric power generation.

  As a technique of hydroelectric power generation, a technique is known in which a spiral turbine equipped with spiral blades is installed in a river channel, and the rotational force of the spiral turbine is converted into electric power by a generator (for example, Patent Document 1).

  Further, as a spiral turbine having such spiral blades, a spiral turbine in which the pitch of the spiral blades is set smaller on the outflow side of the water flow than on the inflow side is known (for example, Patent Document 2).

JP 2013-174198 A JP 2007-154862 A

  In a river, when a spiral turbine is installed in a water channel and hydroelectric power generation is performed by converting the rotational force of the spiral turbine into electric power using a generator, the water flow easily escapes from the spiral turbine, and the river's hydraulic power is sufficiently efficient. Difficult to convert to. In addition, there arises a problem that the amount of power generation greatly fluctuates according to the increase or decrease in the amount of water in the river.

  Therefore, an object of the present invention is to provide a fluid machine that includes a spiral blade and that can be used for efficient and stable hydroelectric power generation.

  In order to achieve the object, the present invention provides a fluid machine including a cylinder and a rotor arranged coaxially with the cylinder. Here, the rotor includes a shaft and one or a plurality of spiral blades fixed to the outer peripheral surface of the shaft. Further, assuming that one of the directions parallel to the cylinder and rotor axes is a first direction and a direction opposite to the first direction is a second direction, the shaft has a diameter closer to the second direction side. A larger portion is provided as a spiral blade attachment portion. The axial range of the spiral blade overlaps the axial range of the spiral blade mounting portion, and the pitch of the spiral blade is narrower toward the second direction side. In addition, the rotor is supported in such a manner that at least a portion of the spiral blade attachment portion and the spiral blade is accommodated in the cylinder, and is rotatably supported coaxially with the cylinder. And the inner peripheral surface of the cylinder are close to or in contact with each other. An inlet for supplying a fluid into the cylinder is provided at an end of the cylinder in the first direction, and a fluid from the cylinder is provided at an end of the cylinder in the second direction. A discharge path for discharging the liquid is provided.

Here, in such a fluid machine, the shape of the outer peripheral surface of the helical blade mounting portion of the shaft may be the same as the shape of the truncated cone or the outer peripheral surface of the cone.
Further, in the fluid machine as described above, the end of the cylinder on the second direction side is sealed, the surface forming the end on the second direction side of the space inside the cylinder, and the spiral blade The end on the second direction side is close to or abuts, and the discharge path is provided so as to communicate the position near the outer peripheral end of the spiral blade at the lower end of the spiral blade inside the cylinder and the outside of the cylinder. It is good as it is.

  Alternatively, in this case, the end of the spiral wing on the second direction side is convex in the second direction side, and the spiral winding when the first direction side is viewed from the second direction side It is good also as what has the shape curved convexly in the direction.

  According to such a fluid machine, since the size of the space between the cylinder and the rotor per one turn of the spiral blade decreases from the inlet toward the discharge path, the space is reduced from the inlet to the cylinder. The fluid can be efficiently increased in pressure and discharged from the discharge path. In addition, the size of the space between the cylinder and the rotor per turn of the spiral blade is made smaller toward the discharge path side by both the shape of the spiral blade attachment portion of the shaft and the pitch of the spiral blade. Changes in the diameter of the spiral wing mounting part per turn of the spiral wing become excessively large, changes in the pitch of the spiral wing per turn of the spiral wing become excessively large, and excessive turns of the spiral wing It is possible to suppress an increase in size, an excessive decrease in the pitch of the spiral blades, and an excessive increase in the diameter of the shaft, and it is possible to increase the pressure of the liquid in a compact fluid machine.

  In addition, the present invention also provides a power generation apparatus including the fluid machine as described above. Here, the fluid machine is installed with the first direction as an upper side and the second direction as a lower side, and the power generation apparatus supplies a water flow to the inlet of the fluid machine from above, and A water wheel that is rotated by a water flow discharged from a discharge path of a fluid machine, and a dynamo that converts the rotational energy of the water wheel into electric power.

  Here, in such a power generation device, the water guide device may be configured to form a spiral water channel whose axis is the vertical direction and supplies a water flow to the inflow port of the fluid machine.

  According to such a power generation device, since the outer peripheral end of the spiral blade of the fluid machine and the inner peripheral surface of the cylinder are close to or in contact with each other, the hydraulic power is prevented from escaping from the spiral blade, Efficient hydropower generation can be performed. In addition, since the fluid machine can be used in a state where the spiral blades and cylinders are installed vertically, it can be installed in a small installation space outside the river without any trouble.

In addition, the present invention also provides a pressure-intensifying device including a prime mover that rotates the shaft as a pressure-intensifying device including the fluid machine as described above.
The present invention also provides a pressure booster provided with two of the fluid machines described above. Here, assuming that one of the two fluid machines is a first fluid machine and the other is a second fluid machine, the cylinder of the first fluid machine and the cylinder of the second fluid machine are the first fluid machine. The shaft of the first fluid machine is integrated so that the end portion on the first direction side of the cylinder of the fluid machine is the end portion on the first direction side of the cylinder of the second fluid machine. And the shaft of the second fluid machine is such that the end portion on the first direction side of the shaft of the first fluid machine is the end portion on the first direction side of the shaft of the second fluid machine. Are integrated. The pressure intensifying device includes a prime mover that rotates the shaft of the integrated first fluid machine and the shaft of the second fluid machine.

  Further, the present invention provides a pressure intensifying device including two of the above-described fluid machines, wherein one of the two fluid machines is a first fluid machine and the other is a second fluid machine. And the cylinder of the second fluid machine are such that the end of the cylinder of the first fluid machine is on the second direction side of the cylinder of the second fluid machine. The shaft of the first fluid machine and the shaft of the second fluid machine are integrated so that the end portion on the second direction side of the shaft of the first fluid machine is the second. There is also provided a pressure increasing device integrated so as to be an end portion on the second direction side of the shaft of the fluid machine. However, the pressure increasing device includes a prime mover that rotates the shaft of the integrated first fluid machine and the shaft of the second fluid machine.

  As described above, according to the present invention, it is possible to provide a fluid machine including a spiral blade, which can be used for efficient and stable hydroelectric power generation.

It is a figure which shows the structure of the fluid machine which concerns on embodiment of this invention. It is a figure which shows the structure of the shaft of the fluid machine which concerns on embodiment of this invention. It is a figure which shows the structure of the spiral wing | blade of the fluid machine which concerns on embodiment of this invention. It is a figure which shows the structure of the lower part of the fluid machine which concerns on embodiment of this invention. It is a figure which shows the structure of the electric power generating apparatus using the fluid machine which concerns on embodiment of this invention. It is a figure which shows the other example of application of the fluid machine which concerns on embodiment of this invention. It is a figure which shows the other structural example of the fluid machine which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described.
First, the fluid machine according to the present embodiment will be described.
1a1a4 shows the configuration of the fluid machine.
Here, FIG. 1a1 represents the upper surface of the fluid machine, FIG. 1a2 represents the front surface of the fluid machine, FIG. 1a3 represents the lower surface of the fluid machine, and FIG. 1a4 represents the internal structure of the fluid machine.
As shown in the drawing, the fluid machine includes a hollow cylindrical cylinder 1 and a rotor 2 inserted into the cylinder 1.
An upper flange 11 is provided at the upper end of the cylinder 1, and a lower flange 12 is provided at the lower end of the cylinder 1.
The rotor 2 has an upper bearing 31 fixed to the upper flange 11 and a lower bearing fixed to the lower flange 12 so as to be rotatable in the cylinder 1 with the central axis of the cylinder 1 as a rotation axis. 32.

Next, as shown in FIG. 1 b, the rotor 2 includes a shaft 21 and a spiral blade 22 fixed to the outer peripheral surface of the shaft 21.
In this fluid machine, the direction indicated by the arrow in the drawing, which is the same as the winding direction of the spiral blade 22 as viewed from below, that is, the direction in which the spiral appears to be lowered by rotation, is defined as the standard rotational direction RD of the rotor 2. used.

  Here, the structure of the shaft 21 is shown in FIGS. 2a1a3. 2a1 shows the upper surface of the shaft 21, FIG. 2a2 shows the front surface of the shaft 21, and FIG. 2a3 shows the lower surface of the shaft 21.

As shown in the drawing, the shaft 21 includes a spiral blade attachment portion 211 whose diameter increases toward the bottom, a cylindrical upper supported portion 212 coaxial with the spiral blade attachment portion 211 above the spiral blade attachment portion 211, and a spiral blade. It consists of a spiral blade attachment portion 211 below the attachment portion 211 and a cylindrical lower bearing portion 213 that is coaxial.
Here, the outer peripheral surface of the spiral blade attachment portion 211 has the same shape as the outer peripheral surface of the truncated cone.

However, the spiral blade attachment portion 211 may have another shape in which the outer peripheral surface does not have the same shape as the outer peripheral surface of the truncated cone as long as the diameter or the cross-section increases toward the lower side.
Further, the combined portion of the upper supported portion 212 and the spiral blade attachment portion 211 may be conical, or the spiral blade attachment portion 211 may be conical without providing the upper supported portion 212. Then, as shown in FIG. 1 a 4, the upper supported portion 212 of the shaft 21 is supported by the upper bearing 31, and the lower supported portion 213 of the shaft 21 is supported by the lower bearing 32. In addition, the spiral blade 22 is coaxially fixed to the shaft 21 over the entire vertical range of the outer peripheral surface of the spiral blade attachment portion 211 of the shaft 21.

  The shaft 21 may be a hollow member as shown in FIGS. 2b1b3. 2b, FIG. 2b1 shows the upper surface of the shaft 21, FIG. 2b2 shows the front surface of the shaft 21, and FIG. 2b3 shows the lower surface of the shaft 21.

In this case, a weight 214 serving as a flywheel may be provided inside the shaft 21 at a position eccentric from the center of gravity of the shaft 21 in the horizontal direction.
Now, returning to FIG. 1, as shown in FIGS. 1 a 4 and 1 b, the spiral blades 22 of the rotor 2 have a shape in which the pitch (the axial interval between the blades) becomes narrower downward. Therefore, the angle of the spiral blade 22 with respect to the rotation axis becomes smaller as it goes upward.

  Here, as shown in an enlarged view of the upper portion of the rotor 2 in FIG. 3a, the rotor 2 includes four spiral blades 22 fixed in different phases by 90 degrees, and the four spiral blades 22 are It is fixed to the outer peripheral surface of the spiral blade attachment portion 211 of the shaft 21 in a quadruple spiral shape. However, the number of spiral blades 22 may be appropriately selected according to the application target of the fluid machine, and only one spiral blade 22 may be provided, or the phases may be fixed with a phase difference of 180 degrees as shown in FIG. 3b. Two spiral blades 22 may be provided.

  Next, the spiral blade 22 is inclined so as to advance upward as it advances from the inner peripheral side to the outer peripheral side with respect to the horizontal direction. That is, for example, as shown in FIG. 3c in a cross section of the rotor 2 having a plane including the central axis of the rotor 2 as a cut surface, the outer peripheral surface of the spiral blade mounting portion 211 of the shaft 21 of the spiral blade 22 as viewed in the cross section. The spiral blade 22 is inclined with respect to the horizontal direction so that the angle of the spiral blade 22 with respect to the angle is 90 degrees.

  Now, returning to FIG. 1, the vertical range in which the spiral blade 22 of the rotor 2 is disposed is accommodated in the cylinder 1, and the distance between the outer peripheral end of the spiral blade 22 and the inner peripheral surface of the cylinder 1 is small. It is set, and the space between the outer peripheral end of the spiral blade 22 and the inner peripheral surface of the cylinder 1 is substantially closed with respect to the liquid. When the influence of friction can be sufficiently reduced, the outer peripheral end of the spiral blade 22 and the inner peripheral surface of the cylinder 1 may be brought into contact with each other.

The lower end of the cylinder 1 is sealed by a lower flange 12, and an opening is provided as an inlet 14 at the upper end of the cylinder 1.
And the space | interval between the upper surface of the part inside the cylinder 1 of the lower flange 12 and the lower end of the spiral blade 22 is set small. When the influence of friction can be sufficiently reduced, the upper surface of the portion inside the cylinder 1 of the lower flange 12 and the lower end of the spiral blade 22 may be brought into contact with each other.

In addition, a discharge passage 15 that is a hole for horizontally connecting the inside and the outside of the cylinder 1 is provided at a position close to the upper surface of the inner portion of the cylinder 1 of the lower flange 12 of the cylinder 1.
Here, as shown in FIG. 4a for the structure of the lower part of the fluid machine and in FIG. 4b for the arrangement of the discharge path 15 as viewed from below, the discharge path 15 corresponds to the four spiral blades 22 at 90 degree intervals. One is provided.
In addition, the discharge path 15 does not necessarily need to be provided horizontally. That is, for example, the discharge path 15 may be provided so as to discharge a water flow downward.

  Further, as shown in FIGS. 4A and 4B, the shape of the lower end of each spiral blade 22 has a shape that is convex downward and convexly convex in the standard rotational direction RD of the rotor 2. By setting the shape of the lower end of each spiral blade 22 to such a shape, it is possible to suppress the occurrence of cavitation near the lower end of the spiral blade 22 and the discharge path 15.

The structure of the fluid machine according to the present embodiment has been described above.
According to such a fluid machine, when the rotor 2 is rotated in the standard rotation direction RD while the cylinder 1 is filled with the liquid, the liquid is sequentially pushed downward by the spiral blade 22. Here, as described above, the diameter of the spiral blade attachment portion 211 on which the spiral blade 22 of the shaft 21 of the rotor 2 is provided is larger toward the lower side, and the pitch of the spiral blade 22 is smaller toward the lower side. The size of the space between the cylinder 1 and the rotor 2 becomes smaller as it goes downward. The space between the outer peripheral end of the spiral blade 22 and the inner peripheral surface of the cylinder 1 is almost sealed against the liquid.

Accordingly, the liquid is sequentially pushed into a narrower space, and the pressure of the liquid increases as it proceeds downward. As a result, the increased liquid is discharged from the discharge passage 15 provided in the lower portion of the cylinder 1. Here, in the fluid machine according to the present embodiment, the spiral blade mounting portion is as described above. Since the size of the space between the cylinder 1 and the rotor 2 per turn of the spiral blade 22 is made smaller by both the shape of 211 and the pitch of the spiral blade 22, the spiral blade 22 The change in the diameter of the spiral blade attachment portion 211 per turn becomes excessively large, the change in the pitch of the spiral blade 22 per turn of the spiral blade 22 becomes excessively large, or the number of turns of the spiral blade 22 is excessive. It is possible to prevent the pitch of the spiral blades 22 from becoming excessively small, or the shaft 21 from excessively increasing in diameter. Therefore, the liquid pressure can be increased satisfactorily in a compact fluid machine.

  Further, the pressure of the liquid increases as it proceeds downward as described above, but the area of the spiral blade 22, that is, the pressure receiving area also decreases as it goes downward. Therefore, it is possible to prevent the pressure from interfering with the rotation of the rotor 2.

Hereinafter, a power generation apparatus using such a fluid machine will be described.
FIG. 5a shows the structure of the power generator.
As shown in the figure, the power generation device includes the fluid machine 50 described above, a water guide device 51, a turbine 52 such as a Pelton turbine, and a dynamo 53.
The fluid machine 50 is installed so that the rotation axis of the rotor 2 is vertical with the inlet 14 facing upward, and the water guide device 51 is connected to the upper part of the fluid machine 50.
The water guide device 51 has a structure including a fixed spiral blade in the tank, and forms a spiral water channel with the vertical direction as an axis. Then, water from a water source such as a river is supplied to the tank of the water guide device 51 from above, and the water supplied to the tank passes through the spiral water channel of the water guide device 51 and enters the inlet 14 of the fluid machine 50. Is injected into the cylinder 1.

  The water flow injected into the cylinder 1 fills the cylinder 1 with water and rotates the spiral blade 22 of the fluid machine 50 by the water pressure and its own weight, so that the water flow increased in pressure as described above is discharged from the discharge passage 15. Is done.

  Then, the water turbine 52 is rotated by the water flow increased in pressure by the fluid machine 50 and discharged from the discharge passage 15 of the fluid machine 50, and power is generated by the dynamo 53 connected to the water wheel 52.

Here, the spiral water channel of the water guiding device 51 is provided in order to efficiently transmit the force of the water flow to the spiral blade 22 on the upper part of the fluid machine 50.
In the above power generation device, the water guide device 51 may form a spiral water channel with a spiral tube, as shown in FIG. 5b.
Alternatively, as the water guiding device 51, a normal tank that drains the accumulated water to the inlet 14 of the fluid machine 50 without using a spiral water channel may be used.
In addition, the water turbine 52 is not provided integrally with the fluid machine 50 as shown in FIGS. 5A and 5B, but the water wheel 52 is provided outside the fluid machine 50, and the water flow discharged from the discharge passage 15 is guided to the water wheel 52. You may make it rotate.
According to such a power generation device, in the fluid machine 50, it is possible to suppress the hydraulic power from escaping outside the spiral blade 22 and perform efficient hydroelectric power generation. Further, after the cylinder 1 is filled with water, the amount of water flowing into the fluid machine 50 becomes constant, and the amount and pressure of the water flow discharged from the fluid machine 50 are also stabilized. Therefore, relatively stable power generation can be performed. Moreover, since the axial direction of the spiral blade 22 or the cylinder 1 which becomes the longitudinal direction of the fluid machine 50 is used as a vertical direction, it can be installed without any trouble in a small installation space outside the river.

Next, an application example of the fluid machine 50 other than the power generator will be described.
6a and 6b show an example in which the fluid machine 50 is applied to a fluid pressure intensifier.
First, the pressure intensifying device shown in FIG. 6a is configured to pressurize and discharge the fluid supplied from the tank 61 into the fluid machine 50 by rotating the rotor 2 by the motor 60 connected to the shaft 21 of the fluid machine 50. It is.

  Next, the pressure booster shown in FIG. 6b connects the fluid machine 50 to the tip of the hose 62, rotates the spiral blade 22 by the pressure of the pressurized fluid supplied from the hose 62 to the fluid machine 50, and The fluid is pressurized and discharged.

By the way, the fluid machine 50 shown by the above embodiment can also be connected and used.
That is, for example, when the fluid machine 50 is applied to a pressure booster, as shown in FIG. 7A, two rotor blades 2 except the upper supported portion 212 shown in FIG. The pressure increasing device is composed of a rotor 700 having a shape in which the upper ends of the same are connected coaxially, a cylinder 701 containing the rotor 700, and a motor 702. The rotor 700 is rotated by the motor 702 and provided in the center. The fluid supplied from the inflow port 703 into the cylinder 701 may be pressurized and discharged from the discharge ports 704 provided at both ends of the cylinder 1.

  Alternatively, as shown in FIG. 7b, two rotors 710 shown in FIG. 1b excluding the lower supported portion 213, and a rotor 710 having a shape in which the lower ends of the spiral blade attachment portions 211 are coaxially connected to each other. The cylinder 711 containing the rotor 710 and the motor 712 constitute a pressure increasing device. The rotor 710 is rotated by the motor 712, and the fluid supplied into the cylinder 711 from the inlets 713 provided at both ends of the cylinder 1 is supplied. You may make it discharge from the discharge port 714 provided in the center of the cylinder 1 under pressure.

  The embodiment of the present invention has been described above.

  DESCRIPTION OF SYMBOLS 1 ... Cylinder, 2 ... Rotor, 11 ... Upper flange, 12 ... Lower flange, 14 ... Inlet, 15 ... Discharge path, 21 ... Shaft, 22 ... Spiral blade, 31 ... Upper bearing, 32 ... Lower bearing, 50 ... Fluid Machine 51 ... Water guide device 52 ... Water wheel 53 ... Dynamo 60 ... Motor 62 ... Hose 211 ... Spiral blade mounting part 212 ... Upper bearing part 213 ... Lower bearing part 214 ... Weight 700 ... Rotor, 701 ... Cylinder, 702 ... Motor, 703 ... Inlet, 704 ... Discharge port, 710 ... Rotor, 711 ... Cylinder, 712 ... Motor, 713 ... Inlet, 714 ... Discharge port.

Claims (8)

A cylinder,
A rotor arranged coaxially with the cylinder;
The rotor includes a shaft and one or a plurality of spiral blades fixed to the outer peripheral surface of the shaft,
One of the directions parallel to the cylinder and rotor axes is defined as the first direction, and the direction opposite to the first direction is defined as the second direction. The shaft has a larger diameter toward the second direction. The part as a spiral wing mounting part,
The axial range of the spiral wing overlaps the axial range of the spiral wing mounting portion,
The pitch of the spiral blade is narrower toward the second direction side,
The rotor is pivotally supported so as to be rotatable coaxially with the cylinder in a form in which at least a portion of the spiral blade attachment portion and the spiral blade are accommodated in the cylinder.
The outer peripheral end of the spiral blade and the inner peripheral surface of the cylinder are close to or in contact with each other,
An inlet for supplying fluid into the cylinder is provided at the end of the cylinder in the first direction, and fluid is discharged from the cylinder at the end of the cylinder in the second direction. discharge passage is provided for,
The end of the cylinder on the second direction side is sealed,
The surface forming the end in the second direction of the space inside the cylinder and the end in the second direction of the spiral blade are close to or in contact with each other,
The discharge path is provided so as to communicate a position near the outer peripheral end of the spiral blade at the lower end of the spiral blade inside the cylinder and the outside of the cylinder,
The end of the spiral wing on the second direction side is convex in the second direction side and is curved in a convex shape in the spiral winding direction when the first direction side is viewed from the second direction side. A fluid machine characterized by comprising:
The fluid machine according to claim 1,
The fluid machine according to claim 1, wherein the shape of the outer peripheral surface of the helical blade mounting portion of the shaft is the same as that of the truncated cone or the outer peripheral surface of the cone.
A power generation device including a fluid machine,
The fluid machine is:
A cylinder,
A rotor arranged coaxially with the cylinder;
The rotor includes a shaft and one or a plurality of spiral blades fixed to the outer peripheral surface of the shaft,
One of the directions parallel to the cylinder and rotor axes is defined as the first direction, and the direction opposite to the first direction is defined as the second direction. The shaft has a larger diameter toward the second direction. The part as a spiral wing mounting part,
The axial range of the spiral wing overlaps the axial range of the spiral wing mounting portion,
The pitch of the spiral blade is narrower toward the second direction side,
The rotor is pivotally supported so as to be rotatable coaxially with the cylinder in a form in which at least a portion of the spiral blade attachment portion and the spiral blade are accommodated in the cylinder.
The outer peripheral end of the spiral blade and the inner peripheral surface of the cylinder are close to or in contact with each other,
An inlet for supplying fluid into the cylinder is provided at the end of the cylinder in the first direction, and fluid is discharged from the cylinder at the end of the cylinder in the second direction. A discharge path is provided, and
The fluid machine is installed with the first direction as an upper side and the second direction as a lower side,
The power generator
A water guide device for supplying a water flow from above to the inlet of the fluid machine;
A water wheel rotated by a water flow discharged from a discharge path of the fluid machine;
A dynamo for converting rotational energy of the water turbine into electric power.
The power generator according to claim 3,
The shape of the outer peripheral surface of the helical blade mounting portion of the shaft is the same as that of the truncated cone or the outer peripheral surface of the cone.
The power generator according to claim 3 or 4,
The end of the cylinder on the second direction side is sealed,
The surface forming the end in the second direction of the space inside the cylinder and the end in the second direction of the spiral blade are close to or in contact with each other,
The power generation apparatus according to claim 1, wherein the discharge path is provided so as to communicate a position near the outer peripheral end of the spiral blade at a lower end of the spiral blade inside the cylinder and the outside of the cylinder.
The power generation device according to claim 5,
The end of the spiral wing on the second direction side is convex in the second direction side and is curved in a convex shape in the spiral winding direction when the first direction side is viewed from the second direction side. A power generator characterized by comprising:
The power generation device according to claim 3, 4, 5, or 6,
The said water guide apparatus forms the spiral water channel which makes a vertical direction an axis | shaft which supplies a water flow to the said inflow port of the said fluid machine.
A pressure intensifying device comprising the fluid machine according to claim 1 or 2,
A pressure intensifying device comprising a prime mover for rotating the shaft.