JP6026786B2 - Hydroelectric generator - Google Patents

Description

  The present invention relates to a convenient hydroelectric power generation apparatus that can be easily installed in a small water channel, a stream, or the like and can generate power efficiently.

  Problems to be considered in a hydroelectric power generation device in a small water channel are that the water channel is narrow, the amount of water is small, and that it is installed in an area with poor scaffolding. Patent Document 1 discloses a power generation device in which a water turbine is accommodated in a duct.

Japanese Patent Laid-Open No. 2000-9012

In Patent Document 1, a plurality of screws are fixed to a support shaft installed in a duct having a constant diameter. Since this screw causes cavitation and the flow of water is poor, the flow of water becomes difficult to flow in the duct, and the power generation efficiency is extremely poor.
At the same time, since the duct has the same diameter in the front and rear, the water flow becomes clogged toward the rear of the duct, and the water flow deteriorates.
The present invention provides a hydroelectric power generation device that is easy to install and that can efficiently rotate to generate power even in a small water channel and a small amount of water.

  The specific contents of the present invention are as follows.

(1) A trapezoidal duct with a larger outlet than the plan view inlet is formed on the base , and the horizontal axis rotor of the turbine is faced immediately after the inlet of the power generation channel inside, and provided outside. Transmission means is linked between the generator and the rotor shaft of the horizontal axis rotor, and the blades of the horizontal axis rotor have a reverse taper shape that gradually increases the chord length from the blade root to the blade tip, and from the maximum chord length portion to the blade tip. A hydroelectric generator that is configured to be inclined toward the front direction, and the flowing water hitting the inclined portion of the blade is discharged in an oblique centrifugal direction and discharged along the inner wall surface of the power generation channel.

(2) The hydroelectric generator according to (1), wherein the blade has a front surface in a maximum chord length portion having an inclination angle from a front edge to a rear edge in a rotation direction of 0 degrees to 6 degrees.

( 3 ) The water turbine includes a horizontal shaft rotor and a housing that supports the rotor shaft, and is suspended horizontally on a top plate of a duct via a support tube. The hydroelectric power generator according to any one of the above.

( 4 ) The hydroelectric power generator according to any one of (1) to (3), wherein a base in front of the side wall of the duct extends in a forward direction, and a projecting ridge is formed at a tip of the base. .

( 5 ) The hydroelectric generator according to any one of (1) to ( 4 ), wherein a rear portion of the side wall of the duct is set lower than a front portion.

( 6 ) The hydroelectric generator according to ( 5 ), wherein the turbine is provided with two rotor shafts in series inside a casing, and a rotor in which each blade rotates in the opposite direction before and after the rotor shaft. .

According to the present invention, the following effects can be obtained.

In the hydroelectric generator described in (1) above, since the power generation channel in the duct in which the water turbine is arranged has a small inlet and a large outlet, the flowing water is diffused toward the outlet, and the portion of the outlet Since the water pressure at the inlet becomes higher than that at the inlet and passes at a high speed due to the difference in water pressure, the rotor effectively rotates at a high speed and high power generation efficiency can be obtained.
Since the rear side of the side wall of the duct protrudes sideways, if this is arranged in the water channel, the rear side of the side wall of the duct plays a role of blocking the water flow, and pushes the water forward to overflow the inlet of the duct. .
The water flow that enters the duct and hits the blade rotates the blade, moves backward in the direction of rotation by its centrifugal force, and rotates the blade by its reaction, so its peripheral speed is faster than the flow velocity, effectively increasing the rotation efficiency. Increase. The outflowing water stream flows smoothly to the outlet along the widened side wall at the rear.

  In the hydroelectric power generation device described in (2) above, since the inclination angle of the front surface of the maximum chord length portion is smaller than 6 degrees, rotation resistance does not occur. However, since the cross section is an airfoil and lift is generated by rotation, it rotates at high speed.

The hydroelectric generator described in ( 3 ) above can be easily installed simply by sinking the duct to the bottom of the water channel because the water turbine is disposed in the duct.

In the hydroelectric generator described in ( 4 ) above, since the base extends forward from the side wall of the duct, if it is installed at the bottom of a water channel or the like, the water pressure is applied to the front base, so that it does not rise, The entire device can be fixed by mooring.

In the hydroelectric generator described in ( 5 ) above, the rear part of the side wall of the duct is set lower than the front part, so that the water flow flows to the rear part having a low height, and the dust flows to the rear part of the side wall. To do.

In the hydroelectric generator described in ( 6 ), the front and rear rotors arranged in front of and behind the casing of the water turbine are rotated in opposite directions in the duct, so that a strong torque is applied to the generator. At the same time, it is rotated with a stable load on the transmission shaft that transmits the rotational force to the generator.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 is a cross-sectional plan view taken along line II-II in FIG. 1. It is a front view of FIG. It is sectional drawing of the largest chord length part of a braid | blade. It is a partial cross-sectional top view which shows the installation state of a hydroelectric generator. It is a partial cross section top view of Example 2 of a hydroelectric generator. It is a partial cross section top view of Example 3 of a hydroelectric generator.

  The present invention will be described below with reference to the drawings.

 1 and 2, a hydraulic power generation apparatus (hereinafter simply referred to as a power generation apparatus) 1 includes left and right side plates 4 and 5 between a base 2 and an upper plate 3, and a rear portion (left side in the figure) in an outward direction. A trapezoidal power generation channel 8 </ b> A having a narrow front portion in a plan view is formed inside the duct 8 having a larger area of the discharge port 7 than the inflow port 6. Configured.

  On the front edge portion of the upper surface of the base 2, a laterally long ridge 2 </ b> A is formed. When the base 2 is placed on the bottom of the irrigation channel, the ridges 2A act so as to press the front part of the base 2 downward as the water flow rides up.

In the trapezoidal power generation channel 8 </ b> A in the duct 8, a water turbine 11 having a horizontal casing 11 </ b> A having a rotor 9 at the front is suspended from the upper plate 3 with a vertical support cylinder 12.
A rotor shaft 9A of the rotor 9 is horizontally mounted inside the casing 11A, and a vertical transmission shaft 12A is supported inside the support cylinder 12 by a bearing 12B.

  The base end portion of the rotor shaft 9A and the lower end of the transmission shaft 12A are linked by transmission means 13 and 14 comprising bevel gears, and the rotational force of the rotor 9 is transmitted to the transmission shaft 12A. At the four corners of the upper plate 3, suspension tools 3A and 3A for mooring on the shore of the irrigation channel are fixed.

  The upper end portion of the transmission shaft 12A protrudes above the upper plate 3, and speed increasing means 16A and 16B made of gears are provided between the main shaft 15A of the generator 15 provided on the upper plate 3. The generator 15 and the speed increasing means 16A, 16B are covered with a lid 17 that can be opened and closed and is watertight.

As shown in a plan view in FIG. 2, the support cylinder 12 has a circular section with a small taper at the front and is thinned toward the rear to form a water droplet as a whole.
As a result, the water flow that hits from the front of the support cylinder 12 smoothly passes rearward due to the Coanda effect, and turbulence does not occur.

  The rotor 9 is formed by fixing a plurality of blades 10 around the hub 9A. The blade 10 gradually increases in width from the blade root to the blade tip in a front view, and has a tip 10A as an inclined portion 10A inclined forward from the maximum chord length portion 10B.

  As shown in FIG. 4, the cross section of the maximum chord length portion 10B is such that the front edge 10D is thicker and gradually thinner toward the rear edge 10E, and the front surface 10C receiving the water flow is from the front edge 10D to the rear edge 10E. It is inclined in the range of 0 degrees to 6 degrees in the back 10F direction.

The maximum thickness of the blade 10 is in the range of 13% to 20% of the chord length and is a lift type, so that the rotational speed gradually increases even when the inclination is 0 degree or close to this. Thus rotation efficiency even those not Gana inclined portion 10A is high.

The action of the inclined portion 10A receives a strong water flow force by suppressing the water flow moving in the centrifugal direction when the rotor 9 rotates.
At the same time, the water flow passes through the front surface of the inclined portion 10A in the direction of oblique centrifugal rotation in the reverse direction at the blade tip, so that the rotational force is increased as a reaction.
The water flow that goes out of the inclined portion 10 </ b> A along with the rotation smoothly flows to the discharge port 7 along the inclined inner wall surfaces of the side walls 4 and 5.

  The position of the rotor 9 is determined so that the inclined portion 10 </ b> A of the blade 10 is located at a position slightly inside from the inlet 6 of the duct 8. Accordingly, the water flow entering the duct 8 hits the blade 10 and rotates it to pass to the discharge port 7 at high speed.

  In other words, the duct 8 has a tunnel shape in which the discharge port 7 is larger than the small inlet 6, and when water flows from the inlet 6, water is diffused in the rear portion of the duct 8, resulting in negative pressure. Therefore, the flowing water passes at a high speed, and the rotor 9 is rotated at a high speed.

  In FIG. 2, the water flow that goes straight from the front direction to the side plates 4 and 5 receives resistance at the side plates 4 and 5, so if the flow is strong, the water flows backward and enters the power generation channel 8 </ b> A from the inlet 6 of the duct 8. It is confirmed that the water pressure in the portion of the inflow port 6 is increased and the side plates 4 and 5 act as a water collecting plate.

  In general, a funnel-shaped or trumpet-shaped guide is provided for collecting water, but if such a funnel-shaped or trumpet-shaped guide is provided in front of the rotor 9, If only half of the incoming water flow can be passed through the outlet 7, the other half will remain in the funnel-shaped or trumpet-shaped guide, and the remaining water flow will be substantially the inlet This is the same as blocking 6.

In FIG. 2, the dust inlet 18 having a pointed tip is attached to the inlet 6 of the duct 8 in a net shape or a lattice shape so that the side surface is on the extended line of the side plates 4 and 5.
As shown in FIG. 5, the rear ends of the side plates 4 and 5 are connected to the side walls 19 </ b> A. When the gaps 20 and 20 are disposed with respect to 19B, the dust that slides on the dustproof tool 18 flows down from the gap 20.

In FIG. 5, the amount of water flowing through the irrigation channel 19 is greater than the amount of water flowing down from the gap 20, so the water blocked by the side plates 4, 5 increases the water pressure and flows backward to flow into the inlet 6.
Therefore, the water pressure in the vicinity of the inlet 6 becomes higher than the water pressure in the vicinity of the outlet 7 and passes through the power generation channel 8A in the duct 8 at a high speed, so that the rotational speed of the rotor 9 is increased.

  As shown in FIG. 4, since the blade 10 as a whole has no twist, the blade 10 does not cause cavitation at the time of rotation. There is no. Since no turbulent flow is generated even when the blade tip is drained, no water bubbles are generated at the blade tip. This could be confirmed visually.

The water flow output test of the power generator 1 of the present invention was conducted at T National University.
5 propeller wings, rotating diameter 600mm
Maximum diameter of duct 1000mm
Generator output 24V 330w (flow velocity 1.2m / s)
Wave-making water tank with wind channel-width 1800mm, water depth 1050mm
The power generation output for each flow rate is shown in Appendix 1.

As shown in Table 1, power is generated at a flow rate of 0.5 m / s, and when the flow rate is 1.0 m / s, which is twice as high, the output is 8-9 times. At a flow rate of 1.2 m / s, power generation of 334 to 338 w was observed.
Even when there was no duct, it generated 111 w at a flow rate of 1.2 m / s, which indicates that the power generation performance has increased about three times by attaching the duct.

The conventional screw-type hydroelectric generator has the same size, a power generation start flow velocity of 1 m / s, and an output of 100 w at a flow velocity of 4 m / s.
That is, the power generation device 1 of the present invention can generate 100 w at a flow rate of 1.2 m / s, whereas the conventional type cannot generate power without a flow rate of 4 m / s. Not a control.

  FIG. 6 is a cross-sectional plan view of the main part of the second embodiment of the hydroelectric generator. The same members as those of the previous example are denoted by the same reference numerals and description thereof is omitted. In Example 2, the shape of the duct 8 is such that the inlet 6 of the trapezoidal power generation channel 8A in FIG. 2 is translated in the forward direction as it is to form a square power generation channel 8B.

  The rotors 99 and 9 are mounted in front of and behind one rotor shaft 9B, and the front rotor 99 is located immediately after the water inlet 66 of the rectangular power generation channel 8B. The rear rotor 9 is located immediately after the inlet 6 of the trapezoidal power generation channel 8A. In this case, the phases of the blades 10 in the front and rear rotors 9 are displaced so that they do not overlap in the front and rear.

The rotors 99 and 9 are rotated by the flowing water passing through the power generation channels 8A and 8B. However, since no cavity is generated, turbulent flow does not occur and the straight flow flows. There is no water flow interference. Moreover, since there are two rotors, the rotational torque is approximately doubled.
Therefore, the rotor 9 can be reduced in size and installed in a small water channel.

FIG. 7 is a partially longitudinal side view of Example 3 of the hydroelectric generator. The same members as those of the previous example are denoted by the same reference numerals and description thereof is omitted.
In the third embodiment, the duct 8 shown in FIG. 6 is used to reverse the rotational directions of the front and rear rotors 99 and 9 and transmit both rotational forces to the transmission shaft 12.

  A central portion of the housing 11 is supported by the upper plate 3 with a support cylinder 12. In the housing 11, two front and rear rotor shafts 9B and 9C are provided in series, and at opposite ends thereof, transmission means 13 and 13 comprising bevel gears linked to the transmission means 14 of the transmission shaft 12A are provided. It has been fixed.

Since the rotors 99 and 9 are respectively attached to the front end portion of the front rotor shaft 9C and the rear end portion of the rear rotor shaft 9B, both the rotors 99 and 9 rotate in the reverse direction.
In this case, the blade 10 in the front rotor 99 has the front edge 10D in FIG. 4 on the right side, and the inclination direction of the front surface 10C is also opposite.

  Therefore, the front and rear rotors 99 and 9 rotate in opposite directions by the water flow passing through the power generation channels 8B and 8A, respectively, and the rotational force causes the generator 15 to rotate with twice the torque via the transmission shaft 12A.

  Since the turbine is placed in a duct with a larger outlet than the inlet, the speed of the water flow passing through the duct is increased, and the turbine is rotated to generate power. It can be set as a high power generator.

1. Hydroelectric generator 2. Base 2A. 2. ridges Upper plate 3A. Hanging tool 4.5. Side plate 6. Inlet 7. Discharge port 8. Duct 8A. Trapezoidal power channel 8B. Rectangular power generation channel 9. Rotor 9A. Hub 9B. Rotor shaft
10. Blade
10A. Slope
10B. Maximum chord length
10C. Front
10D. Leading edge
10E. Trailing edge
10F. back
11.wheel
11A. Enclosure
12． Support tube
12A. Transmission shaft
13.14 Transmission means
15.Generator
15A. Spindle
16A, 16B. Speed increasing means
17.Cover
18． Dustproof
19. Irrigation channel
19A.19B. Sidewall

Claims (7)

On the base, a trapezoidal duct having a larger discharge port than the inflow port in plan view is formed, and the horizontal axis rotor of the turbine is faced immediately after the inflow port of the power generation channel inside the generator. Transmission means is linked between the rotor shafts of the horizontal axis rotor, and the blades of the horizontal axis rotor have a reverse taper shape in which the chord length gradually increases from the blade root to the blade tip, and the front surface extends from the maximum chord length to the blade tip. A hydroelectric generator characterized in that a sloping portion that inclines in a direction, and the flowing water that hits the sloping portion of the blade passes through in an oblique centrifugal direction and is discharged along the inner wall surface of the power generation channel.   2. The hydroelectric power generator according to claim 1, wherein the blade has a front surface in a maximum chord length portion having an inclination angle from a front edge to a rear edge with respect to a rotation direction of 0 degrees to 6 degrees. . The water wheel has a horizontal axis rotor, consists of a housing for supporting the rotor shaft, according to claim 1 or 2, characterized in that it is suspended horizontally through the support tube to the upper plate of the duct Hydroelectric generator. The hydroelectric power generator according to any one of claims 1 to 3 , wherein a base in front of the side wall of the duct extends in a forward direction, and has a horizontal stripe formed at a tip portion thereof. The hydroelectric generator according to any one of claims 1 to 4 , wherein a rear portion of the side wall of the duct is set lower than a front portion. The power generation channel of the duct is characterized in that a square power generation channel is connected to the front of the trapezoidal power generation channel in a plan view, and a rotor is disposed in each of the trapezoidal power generation channel and the square power generation channel. The hydroelectric generator according to any one of claims 1 to 5 . The hydroelectric power generator according to claim 6 , wherein the water turbine is provided with two rotor shafts in series inside a casing, and a rotor in which each blade rotates in the opposite direction before and after the rotor shaft. apparatus.

Images