JP2019044656A - Duct of hydraulic power generator, and hydraulic power generator - Google Patents

Abstract

To provide a duct of a hydraulic power generator, where an inner wall peripheral surface of the duct is subjected to rifling for rotating water stream, the duct being disposed at the front part of a rotor blade.SOLUTION: An inner diameter of a duct 1 disposed at the front part of a rotor blade of a water turbine is made gradually smaller from the front part toward a rear part. On an inner wall peripheral surface of the duct, rifling 2 with plural projects is formed for rotating passing water stream, and an inner wall surface is opposite to a front surface of a forward inclined part 7A of a rotor blade 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a duct disposed at the front of a rotor in a hydroelectric generator, and a hydroelectric generator including the duct.

  The arrangement of the duct at the front of the water turbine rotor is described, for example, in US Pat.

Unexamined-Japanese-Patent No. 2010-112194

In the invention described in Patent Document 1, the rotor of the water turbine is disposed in a long duct, and the front end of the duct has a large diameter in the form of a trumpet tube, but it passes even if the front end has a large diameter. It does not mean that the amount of water to be
The present invention rotates the water flow passing through the inside of the duct by forming a life ring on the inner wall circumferential surface of the duct, thereby accelerating the flowing water and applying the rotational force of the water to the rotor blade to rotate it. Abstract: A duct of a hydroelectric device adapted to improve efficiency and a hydroelectric device provided with the duct are provided.

  The present invention takes the following technical measures in order to solve the problems. The specific contents are as follows.

  (1) The inner diameter of the duct disposed on the front side of the rotor blade of the water wheel is gradually reduced in diameter from the front end to the rear end, and for rotating the passing water flow around the inner wall of the duct. A duct of a hydroelectric power system, wherein a plurality of life rings are formed, and the rear end of the inner wall surface is opposed to the front surface of the forward inclined portion provided at the forward end of the rotor blade.

  (2) The duct of the hydroelectric generator according to (1), wherein the direction of rotation of the life ring is formed such that the water flow is in a direction opposite to the direction of rotation of the lift type rotor blade.

  (3) The duct of the hydraulic power unit according to (1) or (2), wherein the life ring is formed of a plurality of circumferentially inclined steps provided on an inner wall of the duct.

  (4) The duct of the hydroelectric power generation device according to (1) or (2), wherein the life ring is composed of a plurality of ridges arranged at regular intervals in the circumferential direction on the inner circumferential surface of the duct.

  (5) The duct of the hydroelectric power generation device according to (1) or (2), wherein the life ring is composed of a plurality of concave streaks arranged at regular intervals in the circumferential direction on the inner circumferential surface of the duct. .

  (6) Any one of the above-mentioned (1) to (5), wherein an outward facing flange for coupling with an outward facing flange provided at the front end of a pipe body having a rotor inside is formed on the rear end outer peripheral surface of the duct. The duct of the hydroelectric device described in.

  (7) Combining the outward facing flange formed at the rear end of the duct according to the above-mentioned 6 with the outward facing flange formed on the outer peripheral surface of the front part of the pipe body provided with the generator rotor inside A hydroelectric power generation apparatus in which a rear end portion of an inner peripheral surface of a duct is integrated and opposed to a front surface of an inclined portion of a rotor blade.

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

In the invention described in the above (1), the inner diameter of the duct is gradually reduced in diameter from the front to the rear, and since a plurality of life rings are formed on the inner wall of the pipe, it enters the duct in the water channel The flow of water is gradually increased in pressure and passes through the life ring while rotating in a fixed direction.
Also, since the rear end of the duct faces the front surface of the forward inclined portion of the rotor blade, the rotating water flow is from the rear end of the inner wall surface of the duct to the front surface of the forward inclined portion of the rotor blade The rotor's rotational efficiency is enhanced by the rotational force and water pressure of the water flow.

  In the invention described in (2), since the direction of rotation of the life ring in the duct follows the reverse rotation direction of the lift type rotor blade, the water flow passing through the duct rotates along the life ring. Since the discharge and the rotational force are transmitted to the front of the front edge of the forward inclined portion of the rotor blade, the rotor efficiently rotates due to the flow velocity of water and the rotational force by the life ring.

  In the invention described in (3), since the life ring is composed of a plurality of circumferentially sloping steps provided on the inner wall of the duct, the water stream turns along the life ring, and the rotation is efficient. Pass while

  In the invention described in (4), since the life ring is composed of a plurality of ridges arranged at regular intervals in the circumferential direction on the inner circumferential surface of the duct, the water flow passing through the duct is , Passing while rotating along the plurality of ridges, hitting the front of the forward-facing inclined portion of the rotor blade and rotating it efficiently.

  In the invention described in the above (5), the life ring is composed of a plurality of concave streaks arranged at regular intervals on the inner circumferential surface of the duct, so the water flow passing through the duct is a plurality of Passes while rotating along the groove and strikes the front face of the forward inclined portion of the rotor blade, and efficiently rotates it.

  In the invention described in (6), the outward flange for coupling with the outward flange provided at the front end of the pipe body in which the rotor is disposed is formed on the rear end outer peripheral surface of the duct. The water flow passing through the duct is passed while rotating by the life ring formed on the inner circumferential surface of the pipe, and the water pressure and the rotational force are inclined forward of the rotor blades in the pipe body connected to the rear. Hit the front of the unit and rotate it efficiently to increase power generation efficiency.

  In the invention described in the above (7), the inside of the duct is rotated along the life ring and enters the rear pipe, and the rotating water stream is applied to the front of the inclined portion of the rotor blade of the rotor installed therein. Therefore, the rotor blades can be rotated efficiently, and the power generation efficiency is enhanced.

It is a front view showing one embodiment of a duct of the present invention. It is a side view in the state where the rotor was arranged at the back of the II-II line sectional view in Drawing 1. It is the III-III sectional view taken on the line in FIG. FIG. 7 is a front view of another embodiment of the duct of the present invention. FIG. 7 is a front view of yet another embodiment of the duct of the present invention. It is a vertical side view of a hydraulic power unit provided with a duct of the present invention. It is a schematic plan view which shows the relationship between the direction of the spiral of a duct, and a lift type rotor blade. It is a schematic plan view which shows the relationship between the direction of the spiral of a duct, and a drag type | mold rotor blade.

One embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, the duct 1 of the hydraulic power generation device is circular in a front view, and the inner diameter of the front end 1A is slightly larger than the inner diameter of the rear end 1B in a side view.

  The difference between the front and rear diameters is sufficient if the inner wall is inclined about 2 ° with respect to the axis and inclined in the centripetal direction, but a bottleneck is formed at the inner rear edge, and the rear end 1B is widely opened. Flow through the water at high speed.

  On the inner peripheral surface of the duct 1, a plurality of axially twisting life rings 2, 2 for rotating around an axis parallel to the passing water flow increase the rotation of the rotor blade 7 at a constant interval, and It is strung with a step in the direction of speeding up.

  In FIG. 2 showing a cross section taken along the line II-II in FIG. 1 and FIG. 1, a number of spiral grooves 2A inclined so as to become deeper from the direction of the front end 1A to the right in the direction of the rear end 1B The water flow along this life ring 2 is left-handed looking from the front. FIG. 3 is a cross-sectional view taken along the line III-III in FIG.

  Since life ring 2 is formed on the inner wall surface of duct 1 and the inner diameter of rear portion 1 B is smaller than the inner diameter of front portion 1 A, the passing water flow along life ring 2 is the Coanda effect of life ring 2. It moves at high speed along the unevenness, and becomes a rotating water flow and high pressure.

  The extension line of the inner wall surface of the duct 1 is adapted to face the front surface of the forward inclined portion 7A of the rotor blade 7. Therefore, the water flow rotating and discharging along the inner wall surface of the duct 1 strikes the front surface of the forward inclined portion 7A which is the centrifugal portion of the rotor blade 7 and rotates the blade 7.

  As shown in FIG. 2, the rotor 3 of the water turbine is disposed on the axis line immediately after the rear end 1 </ b> B of the duct 1 with a slight gap. The rotor shaft 4 of the rotor 3 is supported by a bearing housing 5, and the bearing housing 5 is suspended by a suspension rod 6 suspended in a water frame and suspended from a suspension frame (not shown). A generator (not shown) is connected to the upper end surface of the hanging rod 6.

A plurality of rotor blades 7 are fixed to the circumferential surface of the hub 3A fixed to the front end of the rotor shaft 4, and the wing tip thereof is a forward inclined portion 7A.
The rear end portion 1B of the inner wall surface of the duct 1 is set to a position facing the front surface of the forward inclined portion 7A of the rotor blade 7, and the water discharged from the rear end portion 1B of the inner wall surface of the duct 1 A water flow which strikes the front face of the front edge of the inclined portion 1A in an oblique direction and passes at high speed along the surface of the rotor blade 7 by the Coanda effect rotates the rotor blade 7 efficiently as a counteraction.

  As shown in FIG. 2, the water flow passing through the inside of the duct 1 hits the front surface of the forward inclined portion 7A of the rotor blade 7 while rotating leftward along the life ring 2 on the inner peripheral surface, and the water pressure The rotational flow generated by the life ring 2 applies a strong rotational force in the rotational direction to the front surface of the forward inclined portion 7A, which is the centrifugal portion of the rotor blade 7. Therefore, the rotor blades 7 rotate efficiently, and the power generation efficiency is enhanced.

  That is, the entire flow passing through the duct 1 is not rotated in the pipe by the life ring 2, but is directed along the life ring 2, and only the outer flow along the inner wall circumferential surface The direction is changed to hit the front surface of the forward inclined portion 7A of the rotor blade 7.

FIG. 4 is a front view of a duct 1 with another form of life ring according to the invention. The same members as in the previous example are given the same reference numerals, and the description thereof is omitted.
A life ring 2 is formed on the inner peripheral surface of the duct 1 and is formed of a groove 2B that is inclined in a left-handed manner in a front view.

The width of the groove 2B of each life ring 2 may be constant, or the groove 2B of large and small widths
May be formed alternately. By this life ring 2, like the life ring 2 of FIG. 1, a portion of the water flow passing through the pipe along the life ring 2 is rotated by the Coanda effect.

FIG. 5 is a front view of the duct showing another shape of the life ring. The same members as in the previous example are given the same reference numerals, and the description thereof is omitted.
On the inner peripheral surface of the duct 1, a life ring 2 is formed which is formed of radial ridges 2C which are inclined leftward in a front view.

  The width of each of the ridges 2C may be the same or may be alternately formed with a large and small width. The life ring 2 rotates the water flow along the inner peripheral surface of the water flow passing along the inner wall surface of the duct 1 as in the life ring 2 of FIG.

The direction of inclination of the life ring 2 is, as shown in FIG. 7, opposite to the direction of rotation of the lift rotor blade 7, that is, the water flow is from the direction of the front edge 7B of the rotor blade 7 in FIG. When the front surface is hit, the rotational efficiency is enhanced by the reaction of the fluid passing along the surface of the blade 7 by the Coanda effect.
Further, as shown in FIG. 8, the characteristic of the drag type blade is made to take advantage of the drag type blade 8 by causing the water flow to hit from the diagonally rear direction of the trailing edge 8B.

  FIG. 6 is a vertical step side view showing another embodiment in which an outward flange 2D is formed on the rear end outer peripheral surface of the duct 1. As shown in FIG. The rear surface of the outward flange 2D is brought into contact with the front surface of the outward flange 9A formed on the front outer surface of the tube 9 in which the rotor is installed. In this case, the rear end portion of the inner peripheral surface of the duct 1 is disposed to face the front surface of the forward inclined portion 7A of the rotor blade 7, whereby the hydroelectric generator 10 is formed.

  Since a plurality of life rings 2 directed in the axial direction are formed on the inner circumferential surface of the duct 1, the water flow passing through the inside passes while rotating along the life ring 2, and the water pressure and rotation of the water flow When the force hits the rotor blade 7, the rotor rotates efficiently, so that it can be effectively used for a hydroelectric generator.

1. duct
1A. Front end 1B. Rear end 2. Life ring 2A. Spiral groove 2B. Concave ridge 2C. Convex ridge 2D. Outgoing flange 3. Rotor 3A. Hub 4. Rotor shaft 5. Bearing housing 6. Hanging rod 7. Lifting type rotor blade 7A. Forward slope
7B. Leading edge 7C. Trailing edge 8. Drag type rotor blade 8A. Leading edge 8B. Trailing edge 9. Tube 9A. Outgoing flange 10. Hydroelectric equipment

Claims (7)

  The inner diameter of the duct disposed on the front side of the rotor blade of the water turbine is gradually reduced in diameter from the front end to the rear end, and a plurality of strips for rotating the passing water flow on the inner wall circumferential surface of the duct A duct for a hydroelectric power generation device, comprising: a life ring, wherein the rear end of the inner wall surface is made to face the front of the forward inclined portion provided at the forward end of the rotor blade.   The duct of a hydroelectric power generation device according to claim 1, wherein the direction of rotation of the life ring is formed such that the water flow along the rotation line hits from the diagonal front direction of the lift type rotor blade.   The said life ring consists of several level | step difference surface which inclines in the circumferential direction provided in the inner wall of the duct, The duct of the hydraulic power unit of Claim 1 or 2 characterized by the above-mentioned.   The duct for a hydroelectric power generation device according to claim 1 or 2, wherein the life ring is composed of a plurality of ridges arranged at regular intervals in the circumferential direction on the inner circumferential surface of the duct.   The duct for a hydroelectric power generation device according to claim 1 or 2, wherein the life ring is composed of a plurality of concave streaks arranged at regular intervals in the circumferential direction of the inner circumferential surface of the duct.   The outward facing flange for connecting with the outward facing flange provided in the front end of the tube which arranged the rotor in the inside is formed in the back end peripheral face of the above-mentioned duct, Duct of the described hydroelectric device.   The outward flange formed at the rear end of the duct according to claim 6 and the outward flange formed on the outer peripheral surface of the front portion of the pipe body provided with the generator rotor inside are integrated A hydroelectric generator characterized in that the rear end portion of the inner peripheral surface of the duct is made to face the front surface of the inclined portion of the rotor blade.

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