JP2007262918A - Hydraulic power generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic power generating device capable of preventing rotation vibration and rotation noise when a water turbine for power generation is rotated. <P>SOLUTION: In a water turbine 5 for power generation of a hydraulic power generating device, a first blade 571 and second blade 572 are formed in an area adjacent to each other in an axial line direction. The outer peripheral ends of the second blades 572 are coupled by a cylindrical plate 58. Four ejection ports 34 are opened to a direction astride both the first blade 571 and cylindrical plate 58. A part of water ejected through an ejection port 34 directly collides with the first blade 571. The rest continuously collides with the outer end surface of the cylindrical plate 58 from each direction. Thus, aligning action is exerted to the water turbine 5 for power generation. The number of ejection ports 34 and the number of blades 57 are prime to each other. Since timings at which four first blades 571 come nearest to the ejection ports 34 respectively are deviated, water ejected through the ejection port 34 is prevented from intensely colliding with two or more blades 57 at the same time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hydroelectric power generation apparatus that generates power using tap water or the like.

  An automatic water faucet device configured to automatically flow water from a faucet when a sensor senses the hand when the hand is placed below the faucet is becoming widespread. In recent years, a small hydroelectric generator has been installed in the middle of the tap water flow path, and the electric power obtained by the hydroelectric generator has been stored and supplied to a sensor circuit of an automatic water faucet. Has been issued.

This type of hydroelectric generator includes a case that forms a flow path from a fluid inlet to a fluid outlet, a support shaft that is disposed in the middle of the flow path, and a cylinder that is rotatably supported by the support shaft. Conventionally, as a power generation water turbine, a plurality of blades each independently projecting outward from an outer peripheral surface is used (see, for example, Patent Document 1). ).
Japanese Patent Laid-Open No. 2004-340111

  In such a hydroelectric generator, there exists a clearance between the shaft hole and the support shaft of the power generation water turbine. In addition, since the water turbine for power generation rotates when the water jetted from the outlet collides with the blades, the positional relationship between the blades and the injection port fluctuates with the rotation of the water turbine for power generation, and the power received by the water turbine for power generation The direction of fluctuates. As a result, there is a problem that rotational vibration and noise are generated when the power generation water turbine rotates.

  In view of the above problems, an object of the present invention is to provide a hydraulic power generation apparatus that can prevent the occurrence of rotational vibration and rotational noise when a power generation water turbine rotates.

  In order to solve the above-mentioned problems, in the present invention, a flow path from a fluid inlet to a fluid outlet, a power generation water turbine arranged to be rotatable around an axis at an intermediate position of the flow path, and the power generation water turbine In the hydroelectric generator having an injection port for injecting water from the surroundings, the power generation water turbine has a plurality of first blades projecting to the outer peripheral side, and a position adjacent to the first blades in the axial direction. And the cylindrical plate portion coaxially configured with respect to the rotation center axis of the water turbine for power generation, and the injection port opens in a direction straddling both the first blade and the cylindrical plate portion. It is characterized by being.

  The water turbine for power generation used in the hydroelectric generator of the present invention includes a cylindrical plate portion at a position adjacent to the first blade in the axial direction, and the injection port is provided in both the first blade and the cylindrical plate portion. Since it is open toward the straddling direction, a part of the water injected from the injection port directly collides with the first blade, while the rest of the water injected from the injection port is the outer end surface of the cylindrical plate part. Always hit from each direction. For this reason, since the pressure of the water which collided with the cylindrical plate part exhibits a centering effect on the power generation water turbine, it is possible to prevent the occurrence of rotational vibration and rotation noise when the power generation water turbine rotates.

  In the present invention, the water turbine for power generation includes a plurality of second blades projecting to the outer peripheral side in a region adjacent to the first blade in the axial direction, and the cylindrical plate portion includes the second blade. It is preferable that the outer peripheral ends of the blades are connected to each other. If comprised in this way, the water flow which collided directly with the 1st blade | wing will pass the inner side of a cylindrical board | plate part after that, but collides with a 2nd blade | wing efficiently in that case. Therefore, since the power generation water turbine can be efficiently rotated, the power generation efficiency of the hydroelectric power generator is improved.

  In this invention, it is preferable that the outer end surface of the said cylindrical board part exists in the position of the same radial distance as the outer peripheral end of a said 1st blade | wing. If comprised in this way, the water flow after colliding directly with a 1st blade | wing can be efficiently guide | induced to the inner side of a cylindrical board part.

  In the present invention, it is preferable that a plurality of the injection ports are formed, and timings at which the plurality of first blades approach the injection ports are shifted from each other. For example, when the plurality of first blades are arranged at equiangular intervals and a plurality of the injection ports are formed at equiangular intervals, the number of the first blades and the number of the injection ports are It suffices if they have a disjoint relationship. That is, it is only necessary to avoid the condition that one of the number of injection ports and the number of first blades is an integral multiple of the other. If comprised in this way, since it can prevent that the water inject | emitted from an injection port hits two or more blades simultaneously simultaneously, it can prevent that big force is simultaneously added to the water turbine for electric power generation. Therefore, it is possible to reliably prevent the occurrence of rotational vibration and rotational noise when the power generation water turbine rotates.

  The water turbine for power generation used in the hydroelectric generator of the present invention includes a cylindrical plate portion at a position adjacent to the first blade in the axial direction, and the injection port is provided in both the first blade and the cylindrical plate portion. Since it is open toward the straddling direction, a part of the water injected from the injection port directly collides with the first blade, while the rest of the water injected from the injection port is the outer end surface of the cylindrical plate part. Always hit from each direction. For this reason, since the pressure of the water which collided with the cylindrical plate part exhibits a centering effect on the power generation water turbine, it is possible to prevent the occurrence of rotational vibration and rotation noise when the power generation water turbine rotates.

  Below, with reference to drawings, the hydroelectric generator to which this invention is applied, and its manufacturing method are demonstrated.

(overall structure)
1A and 1B are a plan view and a cross-sectional view taken along line AA ′ of a hydroelectric power generation apparatus to which the present invention is applied. The AA ′ line does not pass through the injection port formation position, but the injection port is also shown in the left part of FIG.

  A hydroelectric generator 1 shown in FIGS. 1 (a) and 1 (b) is a small hydroelectric generator arranged at a midway position in the flow path of tap water, and stores electric power obtained by the hydroelectric generator 1. It is used for the purpose of supplying this power to a sensor circuit of an automatic faucet device. The hydroelectric generator 1 of the present embodiment includes a resin-made main body case 21 constituting a flow path to be described later, a cover 23 that covers the upper surface of the main body case 21, a stainless cup-shaped partition plate 25 that covers the cover 23, An annular case 27 sandwiching the stator portion 6 between the flange portion of the partition plate 25 and a resin upper case 29 covering the annular case 27 are provided. The upper case 29 and the partition plate 25 are screwed. Is fixed to the main body case 21. An EPDM seal 281 is stacked on the bottom surface of the main body case 21, and a rubber O-ring 282 is disposed between the partition plate 25 and the main body case 21.

  The main body case 21 is provided with a fluid inlet 31 and a fluid outlet 32 that open on opposite side surfaces, and the main body case is located in the middle of a flow path (indicated by an arrow L) from the fluid inlet 31 to the fluid outlet 32. 21 and the cover 23 form a water injection section described later, and a water turbine chamber 35 is formed between the main body case 21 and the partition plate 25. In the water turbine chamber 35, the lower end and the upper end are respectively upright with the support shaft 4 press-fitted and fixed in the shaft fixing holes of the main body case 21 and the partition plate 25, and the support shaft 4 has a cylindrical power generation water turbine. 5 is rotatably supported. A resin sleeve 45 is fitted to the support shaft 4, and the power generation water turbine 5 is supported by the upper half of the support shaft 4 exposed from the sleeve 45. The power generation water turbine 5 is prevented from being displaced in the vertical direction by a washer or the like attached to the support shaft 4.

  A cylindrical permanent magnet 55 is fixed to the outer peripheral surface of the upper half portion of the power generation water turbine 5 located in the cylindrical portion 251 of the partition plate 25. In addition, annular stator sets 61 and 62 are disposed around the cylindrical portion 251 of the partition plate 25, and a power generation unit is configured by the permanent magnet 55 and the stator unit 6.

(Configuration of power generation unit)
The stator portion 6 is composed of two-phase stator sets 61 and 62 arranged so as to overlap in the axial direction. Each of the two stator sets 61 and 62 has a structure in which an outer stator core, a coil wound around a coil bobbin, and an inner stator core are stacked, and pole teeth of the outer stator core are arranged along the inner circumference of the coil bobbin. And the pole teeth of the inner stator core are arranged alternately. Further, the winding start portion and winding end portion of the coil are connected to the connector 69 via the terminal 67 and the wire 68 of the terminal block 66. The upper case 29 is formed with a hood portion 291 that covers the terminal block 66, and has a structure that prevents water from entering the stator portion 6.

(Configuration of water injection section and bypass flow path)
In the hydroelectric generator 1 of this embodiment, in the main body case 21, a partition wall 219 is erected so as to face the fluid inlet 31, and an annular flow path 33 is formed around the water turbine chamber 35 above the partition wall 219. . Here, the annular flow path 33 has a bottom surface, an inner circumferential surface, an outer circumferential surface, and an upper surface, respectively, an annular partition wall 211 of the main body case 21, an annular inner vertical wall 212 of the main body case 21, and an annular shape of the main body case 21. It is defined by the outer vertical wall 213 and the cover 23.

  Here, the inner vertical wall 212 has notches formed at a plurality of circumferential positions, for example, four places. When the cover 23 is placed on the upper surface of the main body case 21, the four notches form an annular flow path. Four injection ports 34 for injecting water at high speed from 33 toward the blades 57 of the power generation water turbine 5 are configured.

  The partition wall 219 is provided with a bypass opening 38 that allows water flowing from the fluid inlet 31 to be directed to the fluid outlet 32 without passing through the annular flow path 33, and this opening 38 is formed on the back surface side of the partition wall 219. It is blocked by a slider 90 arranged at the position. The partition wall 219 has a cylindrical portion 217 extending toward the fluid inlet 31, while the slider 90 has a plate-like valve portion 901 that abuts the back surface of the partition wall 219 via a resin seal 96, and the valve portion 901 has a cylindrical shape. A shaft portion 902 extending into the portion 217, and a washer 92 fixed to the tip of the shaft portion 902 by a push nut 91. A coil spring 95 is interposed between the end portion of the cylindrical portion 217 and the washer 92. Has been placed. Therefore, when the pressure of the water flowing in from the fluid inlet 31 is low, the slider 90 is urged by the coil spring 95 and the valve portion 901 is in contact with the partition wall 219, so that the bypass opening 38 is closed. Yes. However, when the pressure of the water flowing in from the fluid inlet 31 is high and the washer 92 receives a water pressure larger than the urging force of the coil spring 95, the slider 90 is displaced in the direction in which the valve portion 901 is separated from the partition wall 219, thereby bypassing. The opening 38 is opened. Therefore, when the pressure of water flowing in from the fluid inlet 31 is low, all of the water flowing in is guided to the annular channel 33, whereas when the pressure of water flowing in from the fluid inlet 31 is high, it flows in A part of the water is not guided to the annular flow path 33, but goes directly to the fluid outlet 32 through the bypass opening 38. Therefore, even when the pressure of the inflowing water becomes excessively high, the amount of water introduced into the water turbine chamber 35 via the annular flow path 33 can be regulated, so that generation of rotational noise and the like can be prevented. .

(Configuration of water turbine 5 for power generation)
2 (a), 2 (b), and 2 (c) are perspective views of the power generation turbine used in the hydroelectric generator shown in FIG. 1 as viewed from the first radial bearing side. It is the top view when it sees from a radial bearing side, and BB 'sectional drawing.

  As shown in FIGS. 2 (a), (b), and (c), in the hydroelectric generator 1 of this embodiment, the power generation water turbine 5 is a cylindrical body in which a plurality of blades 57 project from the outer peripheral surface at equal angular intervals. 50, a cylindrical first radial bearing 51 located at one end of the through hole 501 of the cylindrical body 50 (a lower side where the main body case 21 is located), and the other end of the through hole 501 (partition And a cylindrical second radial bearing 52 positioned on the upper side where the cylindrical portion 251 of the plate 25 is located, and the shaft hole 510 of the first radial bearing 51 and the shaft of the second radial bearing 52. The power generation water turbine 5 is rotatably supported around the support shaft 4 by fitting the support shaft 4 shown in FIG. The cylindrical body 50 has a large diameter at the lower end where the blades 57 are formed, and a small diameter at the upper half, and a cylindrical permanent magnet 55 is fixed to the small diameter portion.

  In the present embodiment, in the power generation water turbine 5, the plurality of blades 57 are each in the axial direction the first blade 571 located on the second radial bearing 52 side and the second blade 57 located on the first radial bearing 51 side. The outer peripheral end of the second blade 572 is connected by a cylindrical plate portion 58 that is parallel to the axial direction of the cylindrical body 50. Here, the outer end surface of the cylindrical plate portion 58 is located at the same radial distance as the outer peripheral end of the first blade 571.

  As shown in FIGS. 2B and 2C, for the power generation water turbine 5 configured in this way, four injection ports 34 are formed around the power generation water wheel 5 at equal angular intervals. The four injection ports 34 are open in a direction straddling both the first blade 571 and the cylindrical plate portion 58, and as shown by arrows L1 and L2 in FIG. Each of the outlets 34 is configured to inject water across the first blade 571 and the cylindrical plate portion 58. That is, a part of the water ejected from the ejection port 34 directly collides with the first blade 571 as indicated by the arrow L1, while the remaining water ejected from the ejection port 34 remains on the cylindrical plate portion 58. It hits the outer surface.

  Further, in this embodiment, the number of injection ports 34 formed in the water injection section and the number of blades 57 are in a prime relationship, and the condition that one is an integral multiple of the other is avoided. For example, in this embodiment, the number of the ejection ports 34 is four, while the number of the blades 57 is seven.

  In this embodiment, both the first radial bearing 51 and the second radial bearing 52 are resin molded products that are separate from the cylindrical body 50, and the first radial bearing 51 is at one end of the through hole 501. After being press-fitted into the part, it is welded to the cylindrical body 50 and fixed in the through hole 501. Therefore, the clearance between the inner peripheral surface at one end of the through hole 501 and the outer peripheral surface of the first radial bearing 51 is as small as 0 to 0.03 mm, for example. On the other hand, the second radial bearing 52 is inserted into the through hole 501 in a state of being positioned in the radial direction with reference to the shaft hole 510 of the first radial bearing 51, as will be described later. It is welded to. For this reason, when the second radial bearing 52 is positioned in the radial direction with respect to the shaft hole 510 of the first radial bearing 51, the position of the through hole 501 is adjusted so that the position in the through hole 501 can be adjusted in the radial direction. The clearance between the inner peripheral surface at the other end and the outer peripheral surface of the second radial bearing 52 is set large, for example, 0.04 to 0.07 mm.

(Manufacturing method of the hydroelectric generator 11)
Hereinafter, with reference to FIGS. 1, 2, and 3, the configuration of the power generation water turbine 5 will be described in detail while explaining the method of assembling the power generation water turbine 5 in the method of manufacturing the hydroelectric power generator 1 of the present embodiment. .

  3A to 3D are process cross-sectional views illustrating a method for assembling the power generation turbine shown in FIG. First, as shown in FIG. 3A, in the cylindrical body 50, four plate-like welding projections 506 are formed on the lower end surface, and these welding projections 506 are the inner periphery of the through hole 501. Are formed at equiangular intervals. On the other hand, the first radial bearing 51 is formed with a disk-like flange portion 514 whose diameter is enlarged near the lower end. A cylindrical welding protrusion 506 is formed at the base portion of the flange portion 514. Four holes 515 into which are fitted are formed. Further, on the lower end surface of the first radial bearing 51, a circumferential groove 518 that is recessed in the axial direction is opened so as to surround the shaft hole 510 on the inner peripheral side from the position where the hole 515 is formed. A thin cylindrical wall 519 is formed between the circumferential groove 518. Here, since the inner diameter of the shaft hole 510 is switched in the axial direction, and the portion with the smaller inner diameter is the sliding portion 511 with the support shaft 4, the circumferential groove 518 has a thin entire sliding portion 511. A depth formed by the cylindrical wall 519 is formed.

  Further, in the cylindrical body 50, three plate-like welding protrusions 507 are formed on the upper end surface, and these welding protrusions 507 are formed at equal angular intervals along the inner peripheral edge of the through hole 501. Yes. On the other hand, the second radial bearing 52 is formed with a disk-like flange portion 524 whose diameter is increased near the upper end, and a cylindrical welding protrusion 507 is formed at the base portion of the flange portion 524. Three holes 525 are formed in which to fit. Further, a circumferential groove 528 that is recessed in the axial direction is opened on the upper end surface of the second radial bearing 52 so as to surround the shaft hole 520 on the inner peripheral side from the position where the hole 525 is formed. A thin cylindrical wall 529 is formed between the peripheral groove 528 and the circumferential groove 528. Here, since the inner diameter of the shaft hole 520 is switched in the axial direction, and the portion with the smaller inner diameter is the sliding portion 521 with the support shaft 4, the circumferential groove 528 has a thin entire sliding portion 521. A depth formed by the cylindrical wall 529 is formed.

  In assembling the power generation turbine 5 using the cylindrical body 50, the first radial bearing 51, and the second radial bearing 52 configured as described above, first, the first radial bearing fixing shown in FIG. In the process, after the first radial bearing 51 is press-fitted into one end of the through hole 501 so that the welding protrusion 506 formed on the lower end surface of the cylindrical body 50 fits into the hole 515 of the first radial bearing 51. The tip end portion of the welding projection 506 protruding from the hole 515 is heated and melted, and the first radial bearing 51 is fixed to one end portion of the through hole 501 by welding.

  Next, in the centering step, as shown in FIG. 3C, the positioning shaft 9 is fitted into the shaft hole 510 of the first radial bearing 51 fixed to one end of the through hole 501, and then the positioning is performed. The shaft 9 is fitted into the shaft hole 520 of the second radial bearing 52, and the second radial bearing 52 is inserted into the other end of the through hole 501 as shown in FIG. At that time, the welding protrusion 507 formed on the upper end surface of the cylindrical body 50 is fitted into the hole 525 formed in the flange portion 524 of the second radial bearing 52. Here, since the clearance between the inner peripheral surface of the through hole 501 and the outer peripheral surface of the second radial bearing 52 is set to be as large as, for example, 0.04 to 0.07 mm, the second radial bearing 52 can be When positioning in the radial direction with respect to the shaft hole 510 of the first radial bearing 51, the position of the second radial bearing 52 can be adjusted in the radial direction in the through hole 501. A sufficient clearance is also set between the hole 525 and the welding projection 507.

  Next, in the second radial bearing fixing step, the tip end portion of the welding projection 507 protruding from the hole 525 is heated and melted, and the second radial bearing 52 is fixed to the other end portion of the through hole 501 by welding. The second radial bearing 52 fixed in this way also has a function of preventing the permanent magnet 55 from falling off the cylindrical body 50.

  After that, the positioning shaft 9 is pulled out. Regarding the power generation turbine 5 configured in this way, when the hydroelectric generator 1 is assembled, the support shaft 4 is fitted in the shaft hole 510 of the first radial bearing 51 and the shaft hole 520 of the second radial bearing 52. Is disposed in the watermill 35.

(Operation)
In the hydroelectric generator 1 configured as described above, the water flowing from the fluid inlet 31 collides with the partition wall and flows into the upper annular flow path 33, and then from the four outlets 34 toward the blades 57 of the power generation turbine 5. And injected. As a result, the power generation water turbine 5 rotates, and accordingly, the permanent magnet 55 also rotates, so that an induced voltage is generated in the coil of the stator portion 6. The water that has finished turning the power generation water turbine 5 falls downward and is discharged from there through the fluid outlet 32. The induced voltage generated in the stator unit 6 is guided to an external circuit via the connector 69, converted into direct current by this circuit, and then rectified and charged to the battery.

(Main effects of this form)
As described above, the power generation water turbine 5 used in the hydroelectric generator 1 of this embodiment includes the cylindrical plate portion 58 at a position adjacent to the first blade 571 in the axial direction. Functions as a vibration prevention wall. That is, the four injection ports 34 are opened in a direction straddling both the first blade 571 and the cylindrical plate portion 58, and a part of the water injected from the injection port 34 is the first blade 571. The remaining water injected from the injection port 34 always hits the outer end surface of the cylindrical plate portion 58 from each direction. For this reason, since the pressure of the water which collided with the cylindrical plate part 58 exhibits the alignment effect | action to the water turbine 5 for electric power generation, generation | occurrence | production of the rotation vibration and rotation noise when the water turbine 5 for electric power generation rotates can be prevented. .

  Further, since the water flow after directly hitting the first blade 571 hits the second blade 572 efficiently when passing through the inside of the cylindrical plate portion 58, the power generation turbine 5 is rotated efficiently. Moreover, since the outer end surface of the cylindrical plate portion 58 is located at the same radial distance as the outer peripheral end of the first blade 571, the water flow after directly hitting the first blade 571 is inside the cylindrical plate portion 58. Therefore, the water flow directly hitting the first blade 571 is efficiently supplied to the second blade 572, and the power generation turbine 5 is rotated efficiently. Therefore, according to this embodiment, there is an advantage that the power generation efficiency of the hydroelectric generator 1 is high.

  Further, in this embodiment, since a plurality of the injection ports 34 and the blades 57 are formed at equiangular intervals, stable power generation can be performed. Moreover, in this embodiment, four injection ports 34 are formed at equal angular intervals, while seven blades 57 are formed at equal angular intervals, and the number of injection ports 34 and the number of blades 57 are as follows: They are in a prime relationship. That is, a condition in which one is an integral multiple of the other is avoided in the number of injection ports 34 and the number of blades 57. For this reason, since it can prevent that the water inject | emitted from the injection port 34 hits two or more blade | wings 57 simultaneously simultaneously, it can prevent that big force is simultaneously added to the water turbine 5 for electric power generation. Therefore, it is possible to reliably prevent the occurrence of rotational vibration and rotational noise when the power generation water turbine 5 rotates. That is, when one of the number of ejection ports 34 and the number of blades 57 is a multiple of the other, the water ejected from the ejection port 34 strikes a plurality of blades 57 simultaneously and strongly. Although a large force is simultaneously applied to the power generation water turbine 5 and rotation vibration and noise are likely to occur, the timing at which the four first blades 571 are closest to the injection port 34 is shifted according to this embodiment. Therefore, occurrence of such a phenomenon can be avoided.

  Further, in the present embodiment, when configuring the power generation water turbine 5, the cylindrical body 50 in which the blades 57 project from the outer peripheral surface, the first radial bearing 51, and the second radial bearing 52 are formed separately. Therefore, even when the cylindrical body 50, the first radial bearing 51, and the second radial bearing 52 are made of a resin molded product, sink marks or the like are unlikely to occur. Therefore, the first radial bearing 51 and the second radial bearing 52 can be manufactured by resin molding so that both the shaft holes 510 and 520 have the same size with high dimensional accuracy. In addition, after the first radial bearing 51 is fixed to the cylindrical body 50, the second radial bearing 52 is positioned with reference to the shaft hole 510 of the first radial bearing 51. Therefore, the first radial bearing 51 And the second radial bearing 52 can be arranged in a concentric position. Therefore, it is possible to reliably prevent the occurrence of rotational vibration and rotational noise when the power generation water turbine 5 rotates.

  Further, since the cylindrical body 50, the first radial bearing 51, and the second radial bearing 52 are separate bodies, the carbon fiber-containing polyacetal resin is used for the first radial bearing 51 and the second radial bearing 52. It is also possible to form the cylindrical body 50 from an inexpensive resin material such as polyphenylene ether or a resin material suitable for weight reduction. Therefore, even when the radial bearings 51 and 52 are made of an abrasion resistant material, the manufacturing cost can be kept low.

  Further, in the first radial bearing 51 and the second radial bearing 52, circumferential grooves 518 and 528 that are recessed in the axial direction are formed so as to surround the shaft holes 510 and 520, and the shaft holes 510 and 520 and the circumferential grooves 518 and 528 are formed. Thin cylindrical walls 519 and 529 are formed between the two. In addition, of the shaft holes 510 and 520, the entire sliding portions 511 and 521 with the support shaft 4 are constituted by thin cylindrical walls 519 and 529. For this reason, when the 1st radial bearing 51 and the 2nd radial bearing 52 are manufactured by resin molding, the sink in the sliding parts 511 and 521 can be prevented. Therefore, in the first radial bearing 51 and the second radial bearing 52, high accuracy can be obtained in the diameter dimensions of the sliding portions 511 and 521 of the shaft holes 510 and 520. Further, when the first radial bearing 51 is press-fitted into the through hole 501 of the cylindrical body 50, the deformation is absorbed by the circumferential groove 518, so that the inner diameter dimension of the shaft hole 510 is not affected. Further, when the first radial bearing 51 and the second radial bearing 52 are welded to the through hole 501 of the cylindrical body 50, the deformation is absorbed by the circumferential grooves 518 and 528. There is an advantage that the dimensions are not affected.

  Further, since the clearance between the inner peripheral surface of the through hole 501 and the outer peripheral surface of the second radial bearing 52 is larger than the clearance between the inner peripheral surface of the through hole 501 and the outer peripheral surface of the first radial bearing 51, the first The radial bearing 51 can be press-fitted into one end of the through hole 501, and when the second radial bearing 52 is positioned with reference to the shaft hole 510 of the first radial bearing 51, the second radial bearing 51 is used. It is possible to avoid a situation in which 52 cannot hit the inner peripheral surface at the other side end of the through hole 501 and cannot be centered.

  Further, in the centering step when assembling the power generation water turbine 5, the positioning shaft 9 is fitted into the shaft hole 510 of the first radial bearing 51 fixed to one end of the through hole 501, and then the positioning shaft 9 Is fitted into the shaft hole 520 of the second radial bearing 52 to position the second radial bearing 52. For this reason, the positioning of the second radial bearing 52 can be easily and reliably performed based on the shaft hole 510 of the first radial bearing 51.

[Other embodiments]
In the above embodiment, when assembling the power generation water turbine 5, the first radial bearing 51 and the second radial bearing 52 are fixed to the cylindrical body 50 by welding, but a method such as mechanical crushing or adhesion is adopted. May be. Moreover, in the said form, although the water turbine 5 for electric power generation by which the 1st radial bearing 51 and the 2nd radial bearing 52 were comprised separately was used, the 1st radial bearing 51 and the 2nd radial bearing 52 are cylindrical. The present invention may be applied to the case where the power generation water turbine 5 configured integrally with the body 50 is used. Further, in the above embodiment, the four injection ports 34 are formed at equiangular intervals. However, since the four injection ports 34 are formed at unequal angular intervals, the first blades 571 are respectively formed at the injection ports 34. You may employ | adopt the structure from which the timing which approaches closest to has shifted | deviated.

(A), (b) is a top view and AA 'sectional view of a hydroelectric generator to which the present invention is applied. (A), (b), (c) is a perspective view when the water turbine for power generation used in the hydroelectric generator shown in FIG. 1 is viewed from the first radial bearing side, and the power turbine for power generation is a second radial bearing. It is the top view when seen from the side, and BB 'sectional drawing. (A)-(d) is process sectional drawing which shows the assembly method of the water turbine for electric power generation shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydroelectric generator 5 Power generation turbine 6 Stator part 9 Positioning shaft 34 Injection port 35 Turbine chamber 50 Cylindrical body 51 First radial bearing 52 Second radial bearing 55 Permanent magnet 57 Blade 58 Cylindrical plate part 501 Through hole 510, 520 Shaft holes 518, 528 Circumferential groove 571 First blade 572 Second blade

Claims (5)

Hydropower having a flow path from a fluid inlet to a fluid outlet, a power generation water turbine arranged rotatably around an axis at an intermediate position of the flow path, and an injection port for injecting water from the periphery of the power generation water turbine In the power generator,
The power generation water turbine is configured to be coaxial with the rotation center axis of the power generation water turbine at a position adjacent to the first blade in the axial direction with a plurality of first blades projecting to the outer peripheral side. Provided with a cylindrical plate portion,
The hydraulic power generator according to claim 1, wherein the injection port is opened in a direction straddling both the first blade and the cylindrical plate portion. In Claim 1, the water turbine for power generation includes a plurality of second blades projecting to the outer peripheral side in a region adjacent to the first blade in the axial direction,
The said cylindrical board part is comprised so that the outer peripheral ends of a said 2nd blade | wing may be connected, The hydroelectric power generator characterized by the above-mentioned.   3. The hydroelectric generator according to claim 2, wherein an outer end surface of the cylindrical plate portion is located at the same radial distance as an outer peripheral end of the first blade. In any one of Claims 1 thru | or 3, the said injection port is formed in multiple numbers,
The hydraulic power generation device according to claim 1, wherein the timings at which the plurality of first blades are closest to the injection port are shifted. In claim 4, the plurality of first blades are arranged at equiangular intervals, and a plurality of the injection ports are formed at equiangular intervals,
The hydroelectric generator according to claim 1, wherein the number of the first blades and the number of the injection ports are relatively prime to each other.

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