CN104136766A - Hydroelectric power generation device - Google Patents

Abstract

This hydroelectric power generation device is equipped with: an upstream conduit (1) and a downstream conduit (2) installed in a water passage; a runner casing (3) sandwiched between the upstream conduit and the downstream conduit; bosses (4a, 4b, 4c) arranged along the axial direction of the runner casing; and a runner (5) housed within the runner casing so as to be capable of rotating around the axial center of the runner casing. The bosses are divided into two stationary boss units (4a, 4c), which are affixed respectively to the upstream conduit and the downstream conduit along the axial direction of the runner casing, and a rotating boss unit (4b), which is fitted into the runner. An armature (70) is arranged in one of the stationary bosses (4c), a water conduit (40) passes through this stationary boss in the axial direction, and a permanent magnetic field (80) is installed in the rotating boss.

Description

hydroelectric power plant

technical field

The present invention relates to a hydroelectric power generation device installed and used in waterways (in most cases, water pipes).

Background technique

As disclosed in Patent Document 1, a structure has been developed in which a generator part is arranged in a ring shape outside the waterwheel, and instead of building a dam, the sewage, small rivers, agricultural waterways, and factory drainage are developed. Hydroelectric power generation equipment installed and used for power generation on waterways and other waterways that have not yet been utilized. This hydroelectric power generation device has been attracting attention as a clean energy supply source and also as one of means for achieving energy self-sufficiency in places such as mountains where it is difficult to install transmission lines from existing power stations.

FIG. 17 is a cross-sectional view showing the structure of the hydroelectric power generation device disclosed in Patent Document 1 and its cooling mechanism. The annular stator 306 provided with the armature winding 305a wound on the armature core 305b surrounds the upstream pipe 310 attached to the upstream waterway WT1 and the downstream pipe attached to the downstream waterway WT2. 312 engages the outer periphery of the housing 308 to be provided. Furthermore, a cooling mechanism 315 for cooling the heat generated by the armature winding 305 a and the armature core 305 b is provided so as to surround the outer periphery of the annular stator 306 .

In addition, an annular rotor (impeller) 303 with a permanent magnet 304 attached to its outer periphery and propeller blades protruding radially inward than the inner periphery is rotatably positioned inside the stator 306. set up. Furthermore, a hub 302 for guiding the flow of water to the inner wall side of the upstream piping 310 is fixed to the central axis of the housing 308 joining the upstream piping 310 and the downstream piping 312 . Also, guide blades 301 for guiding the flow of water entering the rotor 303 in a direction suitable for the inclination of the propeller blades of the rotor 303 are provided between the outer peripheral surface of the hub 302 and the inner wall of the upstream piping 310 . Further, water lubricated bearings 307 are provided to face both side surfaces of a circular ring protruding toward the center portion of the outer periphery of the rotor 303 .

In addition, the cooling mechanism 315 includes: a ring pipe 316a laid to rotate around the outer circumference of the annular stator 306 multiple times; And the water discharge pipe 316c which returns the water discharged from the discharge part of the ring pipe 316a to the downstream pipe 312.

Prior art literature:

Patent Document 1: Japanese Unexamined Patent Publication No. 2006-189014.

Contents of the invention

Problems to be solved by the invention:

When increasing the power generation capacity or increasing the density of the generator with the structure of the hydroelectric power generation device shown in FIG. Heat generation due to iron loss, etc. will increase. Therefore, in the above case, a more powerful cooling mechanism 315 is required. Therefore, the cooling mechanism 315 has a structure including external equipment such as the coil pipe 316a laid around the outer circumference of the annular stator 306 multiple times, and therefore the size of the cooling structure 315 or the complexity of the structure may be increased. resulting in increased costs.

The present invention was made to solve the above-mentioned problems, and therefore an object of the present invention is to provide a simple and low-cost belt cooling system that can effectively cool the increase in the amount of heat generated with the increase in power generation capacity or the increase in density of generators. Institutional hydroelectric power plant.

Means to solve the problem:

In order to solve the above-mentioned problems, a hydroelectric power generation device installed and used in a waterway according to an embodiment of the present invention is as follows: an upstream side pipe and a downstream side pipe installed in the waterway are provided, and they are sandwiched and installed on the waterway. The impeller casing between the upstream piping and the downstream piping is disposed on a hub in the axial direction of the impeller casing, and accommodated in the impeller casing so as to be rotatable around the axial center of the impeller casing. The impeller in the impeller housing, the hub is divided into a rotating hub and at least one fixed hub, the rotating hub is fitted to the impeller, and the at least one fixed hub is fixedly arranged at a predetermined interval with respect to the rotating hub In the axial direction of the impeller housing, an armature is arranged in the at least one fixed hub, and a permanent armature is arranged in the rotating hub opposite to the armature of the at least one fixed hub. Magnet excitation or electromagnet excitation, a water guide pipe penetrating in the axial direction is arranged in the at least one fixed hub.

According to the above structure, for example, since the impeller is fitted with the rotating hub provided with the permanent magnet excitation of the generator, and the armature of the generator is provided on the fixed hub independent of the rotating hub, it is possible to independently Design/fabrication of impellers and generator parts (rotating hub, fixed hub). In this case, regardless of the size of the waterway, it is possible to install/fabricate an appropriate generator part according to the flow rate and flow velocity of the waterway.

Also, as a cooling mechanism of the hydroelectric power generation device, a water conduit provided on one of the fixed hubs or two fixed hubs provided with the armature is used. An armature (for example, an armature winding around which an armature core is wound) is provided in the space defined by one of the fixed hubs provided with the armature or one of the two fixed hubs. It is easy to accumulate heat around the axis of the shaft. Therefore, if the water duct is passed through the fixed hub provided with the armature in the axial direction as described above, the heat accumulated around the axial center of the fixed hub provided with the armature can be effectively cooled. In particular, when it is desired to increase the power generation capacity or to increase the density of the generator, the current increases and the magnetic field becomes stronger, so the amount of heat generated by copper loss and iron loss of the armature increases. Therefore, when heat generated around the shaft center of the fixed hub is effectively cooled by passing through the water conduit in the fixed hub, power generation efficiency can be improved accordingly, and thus the introduction cost of the hydroelectric power generation device according to the present invention can be further reduced.

In addition, when trying to introduce the cooling mechanism of the existing hydroelectric power generation device, it is necessary to lay the cooling water piping in the fixed hub where the armature is installed, which will lead to the complexity of the overall structure of the cooling mechanism, and the installation of equipment outside the waterway. Increase.

According to the above, it is possible to provide a simple and low-cost hydroelectric power generation device with a cooling mechanism that can effectively cool against an increase in the calorific value due to an increase in power generation capacity or an increase in the density of a generator.

In the hydroelectric power generation device, there may be guide blades fixedly provided on the inner wall of the upstream pipe, and the hub may be divided along the axial direction of the impeller housing into a guide vane fixed to the upstream pipe and The two fixed hubs of the downstream piping and one rotating hub fitted to the impeller, the one rotating hub is provided with the permanent magnet excitation, and one of the two fixed hubs is provided with a The armature and the water guide pipe are provided, and one of the two fixed hubs having the water guide pipe is fixedly installed on the inner wall of the downstream side pipe, and one of the two fixed hubs does not have the The other fixed hub of the water conduit is fixed to the surface of the guide vane located on the axial center side of the upstream pipe.

According to the above configuration, when the water flow is guided from the outer periphery of the rotating hub to the water guiding pipe of the downstream fixed hub, the flow of water passes through the rotating hub and the downstream fixed hub, compared to the case where the water guiding pipe is not provided on the downstream fixed hub. The water flow in the gap between them increases, so that the armature of the fixed hub provided on the downstream side can be effectively cooled. In addition, a simple and low-cost cooling mechanism is realized by providing the water guide tube only in the fixed hub on the downstream side where the armature that generates heat during power generation is installed.

In the hydroelectric power generation device, there may be a water intake for guiding the water flow on the outer peripheral side of the rotating hub in the impeller housing to the front water guide pipe of the one fixed hub, and the water intake may be formed The diameter of the end surface on the upstream side of the one fixed hub runner is longer than the diameter of the end surface on the downstream side of the rotating hub, and the outer peripheral edge portion of the end surface on the upstream side of the one fixed hub is curved toward the upstream side .

According to the above configuration, by providing the water inlet, the water flow on the outer peripheral side of the rotating hub in the impeller casing (the water flow passing through the impeller) can be guided more to the water guide pipe of the fixed hub on the downstream side, thereby further improving the efficiency of the cooling mechanism. cooling performance.

In the above-mentioned hydroelectric power generation device, on the end surface on the upstream side of the one of the fixed hubs having the water guide pipe, there may be formed a section that passes through the armature from the outer peripheral edge of the end surface on the upstream side. to the water feed tank at the inflow port of the aqueduct.

According to the above structure, by providing the water supply groove, the inflow of water from the outer peripheral side of the rotating hub in the impeller housing to the water conduit of the fixed hub on the downstream side can be increased. In addition, since the surface area of the fixed hub that is in contact with water can be enlarged by the water supply groove, the cooling performance of the cooling mechanism can be further improved.

It may also be that in the hydroelectric power generation device, there are the water guide pipes in the two fixed hubs and the rotating hub, and the water guide tubes on both sides of the two fixed hubs and the water guide tubes of the rotating hub Arranged so as to be coaxial in the axial direction of the impeller.

According to the above configuration, water flowing in from the outer peripheral side of the rotating hub in the impeller casing (water passing through the impeller) flows around the armature of the fixed hub provided on the downstream side, and water passing through the upstream side flows. Since the water in the water pipes of the fixed hub and the rotating hub can be further improved, the cooling efficiency of the cooling mechanism can be further improved.

It may also be that in the hydroelectric power generation device, the diameters of the water conduits of the two fixed hubs are longer than the diameters of the water conduits of the rotating hubs.

According to the above structure, the diameter of the water guide pipe of the fixed hub on the upstream side is longer than the diameter of the rotating hub, and thereby, in addition to the flow of water flowing from the outlet of the water guide pipe of the fixed hub to the inflow port of the water guide pipe of the rotating hub, It is easy to generate a flow of water flowing from the outlet of the water guide pipe of the fixed hub to the impeller on the outer periphery of the rotating hub. Therefore, since the flow of water in contact with the impeller increases, it is possible to improve the power generation efficiency while improving the cooling performance of the cooling mechanism.

On the other hand, since the diameter of the water guide pipe of the fixed hub on the downstream side is longer than the diameter of the rotating hub, by virtue of this, in the water guide pipe of the downstream side fixed hub, in addition to the water flow discharged from the water guide pipe of the rotating hub, the flow from the rotating hub The water flowing around the outer periphery of the hood becomes easy to be guided. Therefore, it is possible to increase the flow of water passing through the gap between the rotating hub and the downstream fixed hub, and effectively cool the armature of the downstream fixed hub.

In the hydroelectric power generation device, guide vanes fixed to the inner wall of the upstream pipe may be provided, and the hub may be divided into guide vanes fixed to the upstream pipe along the axial direction of the impeller housing. A fixed hub and a rotating hub fitted to the impeller, the permanent magnet excitation is arranged in the rotating hub, the armature and the water guide pipe are arranged in the fixed hub, the one The fixed hub is fixed to the surface of the guide vane located on the axial center side of the upstream pipe.

According to the above structure, since the guide vane is usually fixedly installed on the upstream pipe, the structure of fixing the fixed hub provided with the armature to the upstream pipe by the guide vane further simplifies the structure of the hydroelectric power generation device. Specifically, by pre-inserting a power cable inside the guide vane, the electrified force generated by the armature disposed in the fixed hub can be extracted to the outside of the waterway through the power cable.

In addition, by generating radial water flow of each hub in the gap between the fixed hub and the rotating hub, the surface area of the armature in contact with water can be enlarged, thereby further improving the cooling performance of the cooling mechanism.

It may also be that in the hydroelectric power generation device, the water guide pipe is provided in the one fixed hub and the one rotating hub, and the water guide tube of the one fixed hub and the water guide tube of the one rotating hub are connected together The impeller housing is coaxially arranged in the axial direction.

According to the above structure, the water passing through the water duct in the fixed hub located on the upstream side is smoothly guided to the water duct located in the rotating hub located on the downstream side, so the amount of water flowing around the armature provided in the fixed hub can be increased, And can effectively cool the armature.

In the hydroelectric power generation device, the diameter of the water conduit of the one fixed hub may be longer than the diameter of the water conduit of the rotating hub.

According to the above structure, by making the diameter of the water guide pipe of the fixed hub on the upstream side longer than the diameter of the water guide pipe of the rotating hub located on the downstream side, the flow from the outlet of the water guide pipe of the fixed hub to the water guide pipe of the rotating hub is eliminated. In addition to the water flow at the inlet of the fixed hub, it is also easy to generate a water flow that flows from the outlet of the water guide pipe of the fixed hub to the impeller on the outer periphery of the rotating hub. Therefore, since the flow of water in contact with the impeller increases, it is possible to improve the power generation efficiency while improving the cooling performance of the cooling mechanism.

In the hydroelectric power generation device, there may be a discharge port for guiding the water discharged from the water guide pipe of the one fixed hub to the impeller on the outer peripheral side of the rotating hub, and the discharge port may be formed so that all The outer peripheral portion of the end surface on the downstream side of the one fixed hub is curved toward the downstream side, and the outer peripheral portion of the end surface on the upstream side of the rotating hub is curved toward the downstream side.

According to the above structure, the flow of water in contact with the propeller blades on the inner periphery of the impeller is not disturbed by providing the drain port. That is, a simple and low-cost cooling mechanism that does not impair the power generation characteristics of the hydroelectric power generation device can be realized.

In the hydroelectric power generation device, the hub may be divided into two fixed hubs fixed to the upstream piping and the downstream piping along the axial direction of the impeller housing, and two fixed hubs fitted to the One rotating hub of the impeller, the permanent magnet excitation is set in the one rotating hub, the armature is set in the two sides of the two fixed hubs, the two sides of the two fixed hubs are connected with the The rotating hub has water guide pipes penetrating in the axial direction, and the water guide pipes on both sides of the two fixed hubs are arranged coaxially with the water guide pipes of the rotating hub in the axial direction of the impeller housing.

According to the above configuration, since the armature is provided on both of the two fixed hubs fixedly installed on the upstream piping and the downstream piping, the power generation capacity can be increased. In addition, since the water guide pipes of the two fixed hubs and the water guide tubes of the rotating hub are arranged on the same axis, the water passing through the water guide pipes in the upstream fixed hub can be smoothly guided to the rotating hub and the downstream fixed hub. Therefore, the amount of water flowing around the fixed hub armature provided on the upstream side and the fixed hub armature provided on the downstream side can be increased, and these armatures can be effectively cooled.

In the hydroelectric power generation device, the hub is divided into two fixed hubs fixed to the upstream piping and the downstream piping along the axial direction of the impeller casing, and a fixed hub fitted to the impeller. One rotating hub, one of the two fixed hubs is provided with an excitation adjuster and a power transmission winding for transmitting the AC power output from the excitation adjuster, and the one rotating hub is provided with A power receiving winding provided opposite to the power transmitting winding, a rectifier for rectifying the received AC power in the power receiving winding, and an electromagnet excitation for exciting the DC power output from the rectifier, the two The other fixed hub of the two fixed hubs is provided with an armature disposed opposite to the electromagnet excitation, and the two fixed hubs and the rotating hub have water conduits penetrating in the axial direction, The two water guide pipes of the two fixed hubs and the water guide pipes of the rotating hub are arranged coaxially in the axial direction of the impeller housing.

According to the above configuration, the synchronous generator is an electromagnet excitation type instead of a permanent magnet excitation type, so when increasing the power generation capacity, it is not necessary to use a permanent magnet excitation which is expensive compared with an electromagnet excitation. In addition, it is possible to respond to an arbitrary power generation capacity through excitation adjustment, and it is not necessary to design/manufacture a hydroelectric power generation device corresponding to each power generation capacity. In addition, heat sources (power transmission coils, power reception coils, electromagnet excitation, armatures) are installed in the fixed hub on the upstream side, the rotating hub, and the fixed hub on the downstream side. coaxial, so that the heat accumulated around the axis of each hub can be effectively cooled.

Invention effect:

According to the present invention, it is possible to provide a simple and low-cost hydroelectric power generation device with a cooling mechanism capable of effectively cooling against an increase in calorific value due to an increase in power generation capacity and densification of generators.

Description of drawings

1 is a cross-sectional view showing a structural example of a hydroelectric power generation device installed and used in a waterway according to Embodiment 1 of the present invention;

2 is a diagram illustrating an example of installation of a permanent magnet field installed in a rotor of the hydroelectric power generation device shown in FIG. 1 and an installation example of an armature installed in a stator of the hydroelectric power generation device shown in FIG. 1;

Fig. 3 is a diagram schematically showing heat distribution in a stator of a hydroelectric power plant;

Fig. 4 is a diagram showing a water flow guided to a water conduit set in a stator of the hydroelectric power generation device shown in Fig. 1;

Fig. 5 is a diagram showing an installation example of a water intake in Embodiment 1 of the present invention;

Fig. 6 is a diagram showing an installation example of a water supply tank in Embodiment 1 of the present invention;

Fig. 7A is a diagram showing another installation example of the water supply tank in Embodiment 1 of the present invention;

FIG. 7B is a diagram showing a state of water flowing into a water conduit provided with a fixed hub of the water supply tank shown in FIG. 7A;

Fig. 8 is a diagram showing an installation example in which all the hubs in Embodiment 1 of the present invention are penetrated by water conduits;

Fig. 9 is a diagram showing another arrangement example in which all the hubs in Embodiment 1 of the present invention are penetrated by water conduits;

10 is a cross-sectional view showing a structural example of a hydroelectric power generation device installed and used in a waterway according to Embodiment 2 of the present invention;

Fig. 11 is a diagram showing an installation example in which all the hubs are penetrated by water conduits according to Embodiment 2 of the present invention;

Fig. 12 is a diagram showing another installation example in which all the hubs in Embodiment 2 of the present invention are penetrated by water conduits;

Fig. 13 is a diagram showing an installation example of a water outlet in Embodiment 2 of the present invention;

14 is a cross-sectional view showing a structural example of a hydroelectric power generation device installed and used in a waterway according to Embodiment 3 of the present invention;

15 is a cross-sectional view showing a structural example of a hydroelectric power generation device installed and used in a waterway according to Embodiment 4 of the present invention;

Fig. 16 is a block diagram showing a configuration example in two fixed hubs and one rotating hub of the hydroelectric power generation device shown in Fig. 15;

Fig. 17 is a cross-sectional view showing a conventional hydroelectric power generation device and its cooling structure.

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, in all the following drawings, the same or equivalent elements are given the same code|symbol, and the repeated description is abbreviate|omitted.

(Embodiment 1)

[Structure Example of Hydroelectric Power Plant]

Fig. 1 is a cross-sectional view showing a structural example of a hydroelectric power generation device installed and used in a waterway according to Embodiment 1 of the present invention. Fig. 2 shows an installation example of permanent magnet excitation installed in the rotor (rotating hub 4b described below) of the hydroelectric power generation device shown in Fig. ) diagram of an armature setup example. Fig. 3 is a diagram schematically showing heat distribution in a stator of a hydroelectric power generation device. Fig. 4 is a diagram illustrating a flow of water guided to a water conduit provided in a stator of the hydroelectric power generation device shown in Fig. 1 .

The hydroelectric power generation device 100 shown in FIG. 1 includes: an upstream pipe 1 attached (connected) to the upstream waterway WT1, a downstream pipe 2 attached (connected) to the downstream waterway WT2, and interposed between the upstream pipe 1 and the downstream pipe 1. The ring-shaped impeller housing 3 between the downstream pipes 2 is arranged in the axial direction of the impeller housing 3, and the streamline-shaped hub (4a, 4b, 4c), the ring-shaped impeller 5 housed in the impeller housing 3 so as to be rotatable around the axis of the impeller housing 3, the guide vane 6a fixed to the inner wall of the upstream pipe 1, and the fixed The hub fixing member 6 b provided on the inner wall of the downstream pipe 2 . In addition, a plurality of propeller blades protruding from the radially inner side of the impeller 5 are arranged, and the guide vane 6 a plays a role of guiding water in a direction suitable for the inclination of the plurality of propeller blades of the impeller 5 .

As shown in FIG. 1 , the streamlined hub ( 4 a , 4 b , 4 c ) is divided into three sections in the axial direction of the impeller housing 3 into one hub (hereinafter referred to as a fixed hub) 4 a fixed to the upstream pipe 1 . , one hub (hereinafter referred to as a rotating hub) 4 b fitted to the circular opening of the impeller 5 , and one hub (hereinafter referred to as a fixed hub) 4 c fixed to the downstream pipe 2 . Furthermore, the fixed hub 4c is provided with an armature 70, and the rotating hub 4b is provided with a permanent magnet field 80 having a plurality of magnetic poles arranged to face the armature 70. As shown in FIG. Specifically, the fixed hub 4a is fixed to the surface of the guide vane 6a located on the axial center side of the upstream pipe 1, whereby the fixed hub 4a is fixed to the inner wall of the upstream pipe 1 by the guide vane 6a. In addition, the rotating hub 4 b is formed in a rotatable state integrally with the impeller 5 by being fitted into the circular opening of the impeller 5 . In addition, the fixed hub 4c is fixed to the surface of the hub fixing member 6b located on the axial center side of the downstream pipe 2, whereby the fixed hub 4c is fixed to the inner wall of the downstream pipe 2 by the hub fixing member 6b.

Fig. 2 shows an example of the installation of the permanent magnet 8 and the laminated electromagnetic steel sheet 9 constituting the permanent magnet field 80 in the rotating hub 4b, and the arrangement of the armature winding 7a and the armature core 7b constituting the armature 70 in the fixed hub 4c. example.

In FIG. 2 , as an example of the installation of the permanent magnet 8 and the laminated electromagnetic steel sheet 9, the arrangement viewed from the outer shaft side of the cylindrical rotating hub 4b and the arrangement viewed from the circular cross section of the rotating hub 4b are mapped by dotted lines. Viewed from the circular cross-section of the rotating hub 4b, the permanent magnet 8 forming a plurality of magnetic poles is buried inside the rotating hub 4b. In addition, when viewed from the cross-section of the rotating hub 4b, a laminated magnetic steel sheet 9 formed by laminating a plurality of circular magnetic steel sheets is attached to both planes of the permanent magnet 8 located inside. The type of magnetic poles of the permanent magnet 8 is a quadrupole type in which two sets of N poles and S poles are arranged separately with a gap provided in each magnetic pole. In addition, a two-pole type in which one set of N poles/S poles is arranged separately with a gap, an eight-pole type in which four sets of N poles/S poles are arranged separately with a gap in each magnetic pole, or an eight-pole type in which each magnetic pole is arranged separately may be used. In the case of a ring-shaped permanent magnet in which four sets of N poles/S poles are continuously arranged annularly without gaps in the magnetic poles, and in the case of a circular laminated electromagnetic steel sheet 9, it is also possible to use no gaps in each magnetic pole. Four sets of fan-shaped N pole/S pole cylindrical permanent magnets are continuously arranged with gaps along the circumferential direction of the laminated electromagnetic steel sheet 9 . In addition, since the number of poles is determined by a specification, it is not limited to the number of poles illustrated above.

In addition, in FIG. 2, as an example of the arrangement of the armature winding 7a and the armature core 7b, the arrangement viewed from the outer peripheral side of the dome-shaped fixed hub 4c and the arrangement viewed from the circular cross-section of the fixed hub 4c are mapped by dotted lines. . On the circular cross section of the fixed hub 4 c , a plurality of (six) armature windings 7 a are spaced apart at equal intervals (for example, at intervals of 60 degrees) along the circumferential direction of the circular cross section. In addition, the planar shape of the armature core 7b around which the armature winding 7a is wound is circular. Alternatively, an armature core formed in a fan-shaped or rectangular planar shape may be used. In addition, since the number of objects of the armature winding 7a and the armature core 7b is determined by a specification, it is not limited to the number of objects illustrated above. Moreover, the armature 70 is not limited to the form in which the armature winding 7a is wound around the outer periphery of the armature core 7b, The form of the hollow armature winding 7a which does not have the armature core 7b may be sufficient.

Moreover, the hydroelectric power generation apparatus 100 shown in FIG. 1 is equipped with the water lubrication bearing 30a, 30b in the outer peripheral part of the impeller 5. As shown in FIG. The water wheel sliding bearings 30a and 30b are lubricated by water flowing in the water channel, and have the characteristics of complete non-contact of the impeller 5, suppression of vibration and noise, and no need for oil. In addition, the sliding surface with the outer peripheral curved surface of the impeller 5 is thermally sprayed with ceramics. Alternatively, the water-lubricated bearings 30a, 30b may be formed of a ceramic solid.

Moreover, the hydroelectric power generation apparatus shown in FIG. 1 is equipped with the water guide pipe 40 which penetrates in the axial center direction of the fixed hub 4c in the fixed hub 4c which provided the armature 70. As shown in FIG. As shown in FIG. 2, the armature winding 7a and the armature core 7b constituting the armature 70 are densely provided in the limited space of the circular cross section of the fixed hub 4c, so it is easy to accumulate around the axis of the fixed hub 4c. Keep the heat. Fig. 3 is a diagram schematically showing heat distribution in the fixed hub 4c of the hydroelectric power plant. Specifically, darker shading indicates higher temperatures. Therefore, in order to efficiently cool the heat accumulated around the axial center of the fixed hub 4c provided with the armature 70, the fixed hub 4c provided with the armature 70 is equipped with the water conduit 40 penetrating in the axial direction.

In addition, as shown in FIG. 4 , the water flow passing through the impeller located on the outer periphery of the rotating hub 4b passes through the gap between the rotating hub 4b and the fixed hub 4c, and is guided to the inlet of the water conduit 40 of the fixed hub 4c. Therefore, the area where the armature 70 provided on the fixed hub 4 c contacts the water flow is increased by the area in contact with the water guide tube 40 compared to the case where the water guide tube 40 is not provided.

In the hydroelectric power generation device 100 having the structure described above, the rotating hub 4b provided with the permanent magnet field 80 of the generator is fitted to the impeller 5, and the generator is installed in the fixed hub 4c independent of the rotating hub 4b. The structure of the armature 70 can be designed/manufactured independently of the impeller 5 and the generator part (rotating hub 4b, fixed hub 4c). Therefore, it is possible to install/fabricate an appropriate generator part according to the flow rate and flow velocity of the waterway regardless of the size of the waterway.

Also, as a cooling mechanism of the hydroelectric power generation device 100, a water conduit 40 penetrating in the axial direction of the fixed hub 4c in the fixed hub 4c provided with the armature 70 is used. With this, it is possible to effectively cool the heat accumulated around the shaft center of the fixed hub 4c where the armature 70 is provided. In particular, when it is desired to increase the power generation capacity or increase the density of the generator, the current is large and the excitation is strong, so the generation due to copper loss of the armature winding 7a or iron loss of the armature core 7b increases. heat. Therefore, the heat generated around the axis of the fixed hub 4c can be effectively cooled by passing through the water guide pipe 40 in the fixed hub 4c, and the power generation efficiency can be increased at the same time, so the introduction cost of the hydroelectric power generation device according to the present invention can be further reduced.

Also, compared with the case where the water guide pipe 40 is not provided in the fixed hub 4c of the hydroelectric power generation device 100, when the water flow is guided from the outer circumference of the rotating hub 4b to the guide pipe 40 of the fixed hub 4c, the flow through the rotating hub 4b and the fixed hub 4c will be increased. The water flow in the gap between them can more effectively cool the surface of the armature winding 7a and the armature core 7b disposed on the fixed hub 4c.

In addition, a simple and low-cost cooling mechanism can be realized by providing the water guide tube only in the fixed hub 4c provided with the armature 70 that generates heat during power generation.

According to the above, it is possible to realize a simple and low-cost hydroelectric power generation device with a cooling mechanism capable of effectively cooling against an increase in calorific value due to an increase in power generation capacity or an increase in the density of a generator.

[Installation example of water intake]

Fig. 5 is a diagram showing an installation example of a water intake in Embodiment 1 of the present invention. As shown in FIG. 5 , in the hydroelectric power generation device 100 shown in FIG. 1 , a water intake 50 is provided to guide water from the outer peripheral side of the rotating hub 4b in the impeller housing 3 to the water conduit 40 of the fixed hub 4c. In addition, the water intake 50 is formed such that the diameter r2 of the end surface on the upstream side (the side where the armature 70 is installed) of the fixed hub 4c is longer than the diameter r1 of the end surface on the downstream side (the side where the permanent magnet field 80 is installed) of the rotating hub 4b, and The outer peripheral portion of the end surface on the upstream side of the fixed hub 4c is curved toward the upstream side. In addition, the shape of the water inlet 50 is not limited to the shape shown in FIG. 5 , as long as it can easily guide the water on the outer peripheral side of the rotating hub 4b in the impeller housing 3 to the water conduit 40 of the fixed hub 4c.

By providing the water inlet 50 that guides the water flow to the water guide pipe 40 of the fixed hub 4c as described above, it is possible to guide more water flow on the outer peripheral side of the rotating hub 4b in the impeller housing 3 through the water guide pipe 40 of the fixed hub 4c. (the flow of water passing through the impeller 5), therefore, the cooling performance of the hydroelectric power generation device 100 can be further improved.

[setting example of water tank]

Fig. 6 is a diagram showing an installation example of a water supply tank in Embodiment 1 of the present invention.

As shown in FIG. 6, in the hydroelectric power generation device 100 shown in FIG. The water supply pipe 60 of the inlet. In addition, the shape (track) of the longitudinal direction of the water supply tank 60 shown in FIG. 6 is linear. In other words, the water supply tank 60 shown in FIG. 6 is radially and straightly formed from the inlet of the water conduit 40 when viewed from the upstream end surface of the fixed hub 4c. In addition, the water supply tank 60 shown in FIG. 6 is formed such that the inlet of the water guide pipe 40 is gradually deepened from the outer peripheral edge side of the end surface on the upstream side of the fixed hub 4c in order to guide the water flow smoothly and in large quantities to the inlet of the water guide pipe 40. The depth of the groove is increased, and the depth of the groove near the inflow port of the water guide pipe 40 is maximized.

Fig. 7A is a diagram showing another installation example of the water supply tank in Embodiment 1 of the present invention. The shape in the longitudinal direction of water supply tank 60 shown in FIG. 6 is linear, but the shape (trajectory) in the longitudinal direction of water supply tank 62 shown in FIG. 7A is helical. In other words, the water supply tank 62 shown in FIG. 7A is formed radially and curved from the inflow port of the water conduit 40 when viewed from the end surface on the upstream side of the fixed hub 4c. In addition, similarly to the water supply tank 60 shown in FIG. 6 , in order to guide the water flow smoothly and in large quantities to the inlet of the water pipe 40 , the inlet of the water pipe 40 is formed from the outer peripheral edge side of the end surface on the upstream side of the fixed hub 4 c. The depth of the groove is gradually increased, and the depth of the groove near the inflow port of the water conduit 40 is maximized. FIG. 7B is a diagram showing a state where water flows into a water conduit provided with a fixed hub of the water supply tank shown in FIG. 7A .

In addition, the shape (trajectory) or the excavation method (the method of changing the depth of the groove) of the longitudinal direction of the water supply tanks 60 and 62 shown in FIGS. To guide the water flow, various lengthwise shapes and excavation methods can be used.

By providing the linear or helical water supply grooves (60, 62) as described above, compared with the case where the water supply grooves (60, 62) are not provided, the distance from the rotating hub 4b in the impeller housing 3 can be increased. The inflow amount of water flowing into the water guide pipe 40 of the fixed hub 4c on the outer peripheral side. Also, the surface area of the fixed hub 4c in contact with water can be increased by the water supply grooves (60, 62). Therefore, the cooling performance of the hydroelectric power generation device 100 can be further improved.

Moreover, by providing the water supply tanks (60, 62), even if the gap between the rotating hub 4b and the fixed hub 4c is narrow, sufficient water inflow to the water conduit 40 of the fixed hub 4c can be easily obtained. Therefore, it is sufficient to shorten the opposing distance between the permanent magnet field 80 of the rotating hub 4b and the armature 70 of the fixed hub 4c, thereby reducing the leakage magnetic flux and further improving the power generation efficiency of the hydroelectric power generation device 100 .

In addition, in the hydroelectric power generation device 100 shown in FIG. 1, if both the water intake (50) as shown in FIG. 5 and the water supply tank (60, 62) as shown in FIGS. The water intake (50) can further increase the inflow of water from the outer peripheral side of the rotating hub 4b in the impeller housing 3 to the water guide pipe 40 of the fixed hub 4c compared to either of the water supply tanks (60, 62). . With this, the cooling performance of the hydroelectric power generation device 100 can be further improved.

[Installation example in which all hubs are penetrated by water pipes]

Fig. 8 is a diagram showing an installation example in which all hubs in Embodiment 1 of the present invention are penetrated by water conduits.

As shown in FIG. 8, in the hydroelectric power generation device 100 shown in FIG. 1, it is not limited to the fixed hub 4c provided with the armature 70, and the fixed hub 4a and the rotating hub 4b may also be provided with guides penetrating in the directions of the respective axes. Water pipes 41,42. In addition, the water guide pipe 41 of the fixed hub 4 a , the water guide pipe 42 of the rotating hub 4 b , and the water guide pipe 40 of the fixed hub 4 c are arranged coaxially in the axial direction of the impeller housing 3 . In addition, other configurations of the hydroelectric power generation device 100 shown in FIG. 8 are the same as those of the hydroelectric power generation device 100 shown in FIG. 1 .

As mentioned above, if all the hubs (4a, 4b, 4c) are penetrated by the water guide pipes (41, 42, 40), in the armature 70 provided on the fixed hub 4c, except for the rotating hub 4b in the impeller housing 3 In addition to the water (water passing through the impeller 5) that enters the outer peripheral side of the hub, it is also easy to contact the water passing through the respective water conduits 41, 42 of the fixed hub 4a and the rotating hub 4b, so the cooling of the hydroelectric power generation device 100 can be further improved. performance. In addition, the water flow passing through the outer periphery of the fixed hub 4 a from the upstream pipe 1 passes the impeller 5 to the outer periphery of the fixed hub 4 c of the downstream pipe 2 after rotating the impeller 5 . At this time, according to Bernoulli's principle, the pressure of the water flow flowing in the downstream pipe 2 is lower than the pressure of the water flow flowing in the upstream pipe 1, so even without installing a special circulation mechanism, the water can be transferred from the upstream pipe 1 The water pipes ( 41 , 42 , 40 ) of all hubs ( 4 a , 4 b , 4 c ) are pressure-fed to the downstream piping 2 .

Fig. 9 is a diagram showing another installation example in which all the hubs in Embodiment 1 of the present invention are penetrated by water conduits.

As shown in FIG. 9, in the hydroelectric power generation device 100 shown in FIG. 1, the diameter of the water conduit 41 of the fixed hub 4a is set to be longer than the diameter of the water conduit 42 of the rotating hub 4b. With this, in addition to the water flow flowing from the water outlet of the water guide pipe 41 of the fixed hub 4a to the inflow port of the water guide pipe 42 of the rotating hub 4b, it is also easy to generate water flow from the water outlet of the water guide pipe 41 of the fixed hub 4a to the rotating hub 4b. The water flow of the impeller 5 on the periphery. Therefore, as the water flow contacting the impeller 5, in addition to the usual water flow passing through the outer periphery of the fixed hub 4a from upstream to downstream, there is also a water flow passing through the gap between the fixed hub 4a and the rotating hub 4b, so as shown in Fig. 14, As will be described later in FIG. 15, when an armature or the like is provided between the fixed hub 4a and the rotating hub 4b, it is possible to simultaneously improve cooling performance and power generation efficiency.

On the other hand, the diameter of the water conduit 40 of the fixed hub 4c is set to be longer than the diameter of the water conduit 42 of the rotating hub 4b. Thereby, in addition to the water flow discharged from the water guide pipe 42 of the rotating hub 4b, the water flow that goes around from the outer periphery of the rotating hub 4b can be easily guided to the water guiding pipe 40 of the fixed hub 4c. Therefore, the flow of water passing through the gap between the rotating hub 4b and the fixed hub 4c can be increased, and the armature 70 provided on the fixed hub 4c can be effectively cooled.

In addition, as a modified example of the hydroelectric power generation device 100 shown in FIGS. 8 and 9, at least a water intake (50) as shown in FIG. , 62), thereby further increasing the inflow of water from the outer peripheral side of the rotating hub 4b in the impeller housing 3 to the water guide pipe 40 of the fixed hub 4c. With this, the cooling performance of the hydroelectric power generation device 100 can be further improved.

In addition, as a modified example of the hydroelectric power generation device 100 shown in FIG. 9 , although the details will be described later, the drain port 90 shown in FIG. 13 may be provided. With this, the disturbance of the water flow can be suppressed while increasing the water flow in contact with the impeller 5, and a simple and low-cost cooling mechanism that does not lose the power generation characteristics of the hydroelectric power generation device 100 shown in FIG. 9 can be realized.

(Embodiment 2)

[Structure Example of Hydroelectric Power Plant]

Fig. 10 is a cross-sectional view showing a configuration example of a hydroelectric power generation device installed and used in a waterway according to Embodiment 2 of the present invention.

In the hydroelectric power generation device 101 shown in FIG. 10 , the streamlined hub ( 4 a , 4 b ) is divided into two stages in the axial direction of the impeller casing 3 into one fixed hub 4 a fixed to the upstream pipe 1 via the guide blade 6 . One rotating hub 4b fitted into the circular opening of the impeller 5 . Moreover, the fixed hub 4a is provided with an armature 70 and is provided with a water conduit 41 penetrating in the axial direction of the fixed hub 4a, and the rotating hub 4b is provided with a permanent magnet having a plurality of magnetic poles arranged opposite to the armature 70. Magnet excitation 80. In addition, the guide vane 6 is provided with a through hole for introducing the power cable, and the electric power generated by the armature 70 provided on the fixed hub 4a is taken out of the waterway by the power cable in the guide vane 6 . In this way, the guide vanes 6 are usually fixed to the upstream pipe 1 , so fixing the fixed hub 4 a provided with the armature 70 to the upstream pipe 1 via the guide vanes 6 simplifies the structure of the hydroelectric power generation device 101 .

The hydroelectric power generation device 101 provided with the structure demonstrated above has the same effect as the hydroelectric power generation device 100 shown in FIG. 1.

Specifically, the rotating hub 4b provided with the permanent magnet excitation 80 is fitted to the impeller 5 and the fixed hub 4a is provided with the structure of the armature 70, so that the impeller 5 and the generator part (rotating hub 4b, fixed hub 4a, etc.) can be independently designed/made. 4a). With this, it is possible to install/fabricate an appropriate generator part according to the flow rate and flow velocity of the waterway regardless of the size of the waterway.

Also, as a cooling mechanism of the hydroelectric power generation device 101 , a water conduit 41 penetrating in the axial direction of the fixed hub 4 a inside the fixed hub 4 a provided with the armature 70 is used. With this, it is possible to effectively cool the heat accumulated around the shaft center of the fixed hub 4a where the armature 70 is provided. Especially when it is desired to increase the power generation capacity or increase the density of the generator, the current increases and the magnetic field becomes stronger, so it is caused by copper loss of the armature winding 7a constituting the armature 70 or iron loss of the armature core 7b. heat will increase. Therefore, if the heat generated around the axis of the fixed hub 4a can be effectively cooled by the water guide pipe 41 penetrating through the fixed hub 4a, the power generation efficiency can be improved, so the introduction cost of the hydroelectric power generation device according to the present invention can be further reduced.

In addition, a simple and low-cost cooling mechanism is realized by providing the water conduit 41 only in the fixed hub 4a provided with the armature 70 that generates heat during power generation.

Furthermore, by generating radial water flow on each hub in the gap between the fixed hub 4a and the rotating hub 4b, the surface area of the armature 70 in contact with water is enlarged, thereby further improving the cooling performance.

As described above, a simple and low-cost hydroelectric power generation device 101 with a cooling mechanism capable of effectively cooling against an increase in calorific value due to an increase in power generation capacity or a high-density generator, etc. can be realized.

[Installation example in which all hubs are penetrated by water pipes]

Fig. 11 is a diagram showing an installation example in which all the hubs are penetrated by water conduits in Embodiment 2 of the present invention.

In the hydroelectric power generation device 101 shown in FIG. 11, not only the fixed hub 4c provided with the armature 70, but also the water conduit 42 penetrating in the rotation direction of the rotary hub 4b is provided in the rotary hub 4b. Also, the water guide pipe 41 of the fixed hub 4 a and the water guide pipe 42 of the rotating hub 4 b are arranged coaxially in the axial direction of the impeller housing 3 .

As mentioned above, if all the hubs (4a, 4b) are penetrated by the water ducts (41, 42), the water passing through the water ducts 41 in the fixed hub 4a on the upstream side can be smoothly guided to the rotating hub 4b on the downstream side. Therefore, the amount of water flowing around the armature 70 arranged on the fixed hub 4a can be increased, and the armature 70 can be effectively cooled.

Fig. 12 is a diagram showing another installation example in which all the hubs are penetrated by a water conduit in Embodiment 2 of the present invention.

In the installation example shown in FIG. 11, the diameter of the water guide pipe 41 in the fixed hub 4a on the upstream side is the same as the diameter and length of the water guide pipe 42 in the downstream rotating hub 4b. However, in the installation example shown in FIG. The diameter of the water guide pipe 41 in the fixed hub 4a on the upstream side is longer than the diameter of the water guide pipe 42 in the rotating hub 4b on the downstream side. By virtue of this, in addition to the water flow flowing from the water outlet of the water guide pipe 41 of the fixed hub 4a to the inflow port of the water guide pipe 42 of the rotating hub 4b, there is also a flow from the water outlet of the water guide pipe 41 of the fixed hub 4a to the rotating hub 4b. The water flow of the impeller 5 on the periphery. Therefore, in addition to the usual water flow passing through the outer periphery of the fixed hub 4a from upstream to downstream as the water flow in contact with the impeller 5, there is also a water flow passing through the gap between the fixed hub 4a and the rotating hub 4b, so that it can be simultaneously To improve the cooling performance and improve the power generation path.

Fig. 13 is a diagram showing an installation example of a drain port in Embodiment 2 of the present invention.

As shown in FIG. 13 , the hydroelectric power generation device 101 shown in FIG. 12 includes a drain port 90 that guides the flow of water discharged from the water conduit 41 of the fixed hub 4 a to the impeller 5 on the outer peripheral side of the rotating hub 4 b. The drain port 90 is formed so that the outer peripheral edge 91 of the downstream end surface of the fixed hub 4 a is curved downstream, and the outer peripheral edge 92 of the upstream end surface of the rotating hub 4 b is curved downstream. As a result, the water flowing through the gap between the fixed hub 4 a and the rotating hub 4 b bends the rail downstream according to the degree of curvature of the drain port 90 and is discharged from the drain port 90 .

In addition, when the diameter of the water guide pipe 41 of the fixed hub 4a is longer than the diameter of the water guide pipe 42 of the rotating hub 4b, in addition to the usual water flow passing through the outer periphery of the fixed hub 4a from upstream to downstream in the impeller 5, it is also connected with the water flow passing through the fixed hub 4a. In contact with the water flow in the gap between the rotating hubs 4b. At this time, the normal flow of water passing through the outer periphery of the fixed hub 4a and the flow of water passing through the gap between the fixed hub 4a and the rotating hub 4b tend to interfere with each other, resulting in turbulence of the flow of water flowing backward from the downstream side to the upstream side. Therefore, the water flow passing through the gap between the fixed hub 4a and the rotating hub 4b is discharged from the water outlet 90 after the track is bent to the downstream side through the water outlet 90, and the interference with the water flow passing through the outer periphery of the fixed hub 4a is suppressed. The confluence form is considered, so that the disturbance of the water flow in contact with the impeller 5 can be suppressed. As a result, a simple and low-cost cooling mechanism that does not impair the power generation characteristics of the hydroelectric power generation device 101 can be realized.

(Embodiment 3)

Fig. 14 is a cross-sectional view showing a structural example of a hydroelectric power generation device installed and used in a waterway according to Embodiment 3 of the present invention.

The hydroelectric power generation device 102 shown in FIG. 14 is the same as the hydroelectric power generation device 100 shown in FIG. 1 , the streamline-shaped hub is divided into three segments into two dome-shaped fixed hubs (4a, 4c) and a cylindrical rotating hub. Hub 4b. However, the difference is that armatures ( 70 a , 70 b ) are provided on both sides of the fixed hubs ( 4 a , 4 c ), and multiple armatures ( 70 a , 70 b ) are provided in the rotating hub 4 b to face the armature 70 a of the fixed hub 4 a. A permanent magnet field 80a of one magnetic pole and a permanent magnet field 80b of a plurality of magnetic poles arranged to face the armature 70b of the fixed hub 4c. In addition, in the case of the hydroelectric power generation device 103 shown in FIG. 14 , the generated power is taken out from the armature 70a of the fixed hub 4a of the upstream pipe 1 via the guide vane 6a, and is fixed to the hub fixed member 6b via the armature 70a. The generated electric power is extracted from the armature 70b of the fixed hub 4c of the downstream piping 2 .

Moreover, since the armature (70a, 70b) as a heat source is provided in both the fixed hub 4a on the upstream side and the fixed hub 4c on the downstream side, it is compatible with the hydroelectric power generation device 100 shown in FIG. 8 or the hydraulic power generator shown in FIG. The power generation device 101 is the same, and all the hubs (4a, 4b, 4c) are penetrated by water guide pipes (41, 42, 40).

In addition, as shown in FIG. 2, in addition to the structure in which permanent magnet excitations (80a, 80b) are respectively provided on the upstream and downstream cross-sections of the cylindrical rotating hub 4b, it is also possible to use, for example, , a structure in which a permanent magnet is disposed in the center of an electromagnetic steel sheet laminate in which a plurality of electromagnetic steel sheets are stacked. That is, the permanent magnets of the motors corresponding to the upstream armature 70a and the downstream armature 70b of the rotating hub 4b may be used in common with the permanent magnet at the center of the electromagnetic steel sheet laminate.

The other configurations of the hydroelectric power generation device 102 shown in FIG. 14 are the same as those of the hydroelectric power generation device 100 shown in FIG. 1 , and therefore description thereof will be omitted.

According to the hydroelectric power generation device 102 of the above-described structure, the armatures (70a, 70b) are provided on both of the fixed hubs (4a, 4c) fixedly installed on the upstream pipe 1 and the downstream pipe 2, respectively, so that further Expand power generation capacity. In addition, since the water guide pipes (41, 40) of the fixed hubs (4a, 4c) and the water guide pipe 42 of the rotating hub 4b are coaxially arranged, the water passing through the water guide pipe 41 in the fixed hub 4a on the upstream side is guided smoothly. To each water guide pipe in the rotating hub 4b and the fixed hub 4c on the downstream side. Therefore, the amount of water flowing around the armature 70a of the fixed hub 4a provided on the upstream side and the armature 70b of the fixed hub 4c provided on the downstream side can be increased, and their armatures (70a, 70b) can be effectively cooled.

In addition, as a modified example of the hydroelectric power generation device 102 shown in FIG. 14 , except that all the hubs ( 4 a , 4 b , 4 c ) are penetrated by the water conduits ( 41 , 42 , 40 ), the rotating hub 4 b may not be provided with The water guide pipe 42 is penetrated by the water guide pipes (41, 40) in the fixed hub 4a on the upstream side and the fixed hub 4c on the downstream side.

Also, as a modified example of the hydroelectric power generation device 102 shown in FIG. 14, by at least having a water intake (50) as shown in FIG. 5 and a water supply tank (60, 62) as shown in FIG. 6 and FIG. 7A In this way, the inflow of water from the outer peripheral side of the rotating hub 4b in the impeller housing 3 to the water guide pipe 40 of the fixed hub 4c can be further increased. With this, the cooling performance of the hydroelectric power generation device 100 can be further improved.

In addition, as a modified example of the hydroelectric power generation device 102 shown in FIG. 14 , a drain port ( 70 ) as shown in FIG. 13 may be provided. With this, disturbance of the water flow in contact with the impeller 5 can be suppressed, and a simple and low-cost cooling mechanism that does not impair the power generation characteristics of the hydroelectric power generation device 102 shown in FIG. 14 can be realized.

(Embodiment 4)

Fig. 15 is a cross-sectional view showing a configuration example of a hydroelectric power generation device installed and used in a waterway according to Embodiment 4 of the present invention. Fig. 16 is a block diagram showing a configuration example in two fixed hubs and one rotating hub of the hydroelectric power generation device shown in Fig. 15 .

The hydroelectric power generation device 103 shown in FIG. 15 is the same as the hydroelectric power generation device 100 shown in FIG. 1 and the hydroelectric power generation device 102 shown in FIG. Stationary hubs (4a, 4c) and a rotating hub 4b. However, the difference is that the permanent magnet excitation 80 is used as the excitation pole of the generator with respect to the hydroelectric power generation device 100 shown in FIG. 1 and the hydroelectric power generation device 102 shown in FIG. The electromagnet excitation 14 is used as the excitation pole of the generator.

Specifically, the fixed hub 4 a is provided with an excitation regulator 10 and a power transmission coil (induction coil) 11 for transmitting AC power output from the excitation regulator 10 . In addition, the rotating hub 4b is provided with a power receiving coil (induction coil) 12 disposed opposite to the power transmitting coil 11, a rectifier 13 for adjusting the AC power received by the power receiving coil 12, and a direct current outputted from the rectifier 13. Electromagnet excitation 14 wound around the iron core for excitation by electric power. Moreover, the armature 15 is provided in the fixed boss|hub 4c so that it may oppose the electromagnet field 14, and is arrange|positioned. That is, the power transmission coil 11 generates an electromagnetic field by the AC power output from the field regulator 10 , and the power reception coil 12 receives the electromagnetic field generated by the power transmission coil 11 by electromagnetic induction. As a result, induced power is generated in the power receiving winding 12 . The induced power is rectified into DC power by the rectifier 13 and supplied to the electromagnet field 14 . The electromagnet field 14 has an electromagnet function, and rotates around the axis of the impeller housing 3 together with the rotating hub 4 b, so that electric power is generated in the armature 15 .

In addition, both of the fixed hubs 4a and 4c and the rotating hub 4b have water guide pipes ( 41 , 42 , 40 ) penetrating in the directions of the respective axial centers. Furthermore, the water conduit 41 of the fixed hub 4 a , the water conduit 42 of the rotating hub 4 b , and the water conduit 40 of the fixed hub 4 c are arranged coaxially in the axial direction of the impeller housing 3 .

Other configurations of the hydroelectric power generation device 103 shown in FIG. 15 are the same as those of the hydroelectric power generation device 100 shown in FIG. 1 .

According to the hydroelectric power generation device 103 of the above-described structure, it is formed as an electromagnet type synchronous generator structure instead of a permanent magnet type, so it is not necessary to use expensive permanent magnets compared with the components that realize the electromagnet including the field winding 14. magnet. In addition, it is possible to respond to an arbitrary power generation capacity through excitation adjustment, and it is not necessary to design/manufacture a hydroelectric power generation device corresponding to each power generation capacity. In addition, various windings (power transmission winding 11, power reception winding 12, electromagnet excitation 14, armature 15) are provided as heat sources in the fixed hub 4a on the upstream side, the rotating hub 4b, and the fixed hub 4c on the downstream side. . Therefore, by arranging the water guide pipes (41, 42, 40) penetrating through the respective hubs (4a, 4b, 4c) coaxially, the area around the axial center of each hub (4a, 4b, 4c) can be effectively cooled. Leave the heat.

In addition, as a modified example of the hydroelectric power generation device 103 shown in FIG. 15 , by including at least a water intake ( 50 ) as shown in FIG. 5 and a water supply tank ( 60 , 62 ) as shown in FIGS. 6 and 7 In this way, the inflow of water from the outer peripheral side of the rotating hub 4b in the impeller housing 3 to the water guide pipe 40 of the fixed hub 4c can be further increased. With this, the cooling performance of the hydroelectric power generation device 103 can be further improved.

In addition, as a modified example of the hydroelectric power generation device 103 shown in FIG. 15 , a drain port ( 70 ) as shown in FIG. 13 may be provided. With this, disturbance of the water flow in contact with the impeller 5 can be suppressed, and a simple and low-cost cooling mechanism that does not impair the power generation characteristics of the hydroelectric power generation device 103 shown in FIG. 15 can be realized.

From the above description, many improvements and other embodiments of the present invention will be apparent to those skilled in the art. Therefore, the above description should be interpreted as an example only, and is provided for the purpose of teaching the most preferable mode for carrying out the present invention to those skilled in the art. The details of its structure and/or function may be substantially changed without departing from the gist of the present invention.

Industrial applicability:

The present invention is useful for installing and using a hydroelectric power generation device used in a waterway.

Symbol Description:

WT1 upstream water flow;

WT2 downstream side waterway;

1 Upstream piping;

2 downstream piping;

3 impeller housing;

4a, 4c fixed hub;

4b rotating hub;

5 impellers;

6, 6a guide vane;

6b hub fixing member;

70 armature;

7a armature winding;

7b Armature core;

80 permanent magnet excitation;

8, 8a, 8b Permanent magnets;

9 laminated electromagnetic steel plates;

10 excitation regulator;

100, 101, 102, 103 hydroelectric power generation device;

11 power transmission winding;

12 power receiving winding;

13 rectifier;

14 electromagnet excitation;

15 armature;

30a, 30b water lubricated bearings;

40, 41, 42 aqueducts;

50 water intake;

60, 62 water tank;

90 outfall;

91, 92 Peripheral edge.

Claims (12)

1. A hydroelectric power generation device, in the hydroelectric power generation device installed and used in waterways, it has: Installed on the upstream side piping and downstream side piping of the waterway; an impeller housing sandwiched between the upstream piping and the downstream piping; a hub disposed in the axial direction of the impeller casing; and an impeller housed in the impeller housing in a manner to be rotatable about the axis of the impeller housing; said hub is divided into a rotating hub and at least one fixed hub; The rotating hub is fitted to the impeller; The at least one fixed hub is fixedly arranged in the direction of the axis of the impeller casing at a predetermined interval with respect to the rotating hub; An armature is arranged in the at least one fixed hub; A permanent magnet excitation or an electromagnet excitation is arranged in the rotating hub opposite to the armature of the at least one fixed hub; A water guide pipe penetrating in the axial direction is provided in the at least one fixed hub. 2. The hydroelectric power generation device according to claim 1, wherein: having a guide vane fixed to the inner wall of the upstream pipe; The hub is divided into two fixed hubs fixed to the upstream piping and the downstream piping along the axial direction of the impeller housing, and one rotating hub fitted to the impeller; The permanent magnet excitation is arranged in the one rotating hub; One of the two fixed hubs is provided with the armature and the water conduit; Among the two fixed hubs, the one having the water guide pipe is fixedly arranged on the inner wall of the downstream pipe; The other of the two fixed hubs that does not have the water guide pipe is fixed to the surface of the guide vane located on the axial center side of the upstream pipe. 3. The hydroelectric power generation device according to claim 2, wherein: having a water intake for guiding the water on the outer peripheral side of the rotating hub in the impeller housing to the water guide pipe on the front side of the one fixed hub; The water intake is formed such that the diameter of the upstream end surface of the one fixed hub runner is longer than the diameter of the downstream end surface of the rotating hub, and the outer peripheral edge of the upstream end surface of the one fixed hub bowed upstream. 4. The hydroelectric power generation device according to claim 2 or 3, characterized in that, On the upstream end surface of the one fixed hub having the water conduit, there is formed a water supply groove that passes between the armatures and reaches the inlet of the water conduit from the outer peripheral portion of the upstream end surface. . 5. The hydroelectric power generation device according to any one of claims 2 to 4, characterized in that, There are said water conduits in said two fixed hubs and said rotating hubs; The water guide pipes on both sides of the two fixed hubs are arranged coaxially with the water guide pipes of the rotating hub in the axial direction of the impeller. 6. The hydroelectric power generation device according to claim 5, wherein: The diameter of the water conduits of the two fixed hubs is longer than the diameter of the water conduits of the rotating hubs. 7. The hydroelectric power generation device according to claim 1, wherein: having a guide vane fixed to the inner wall of the upstream pipe; The hub is divided into a fixed hub fixed to the upstream pipe and a rotating hub fitted to the impeller along the axial direction of the impeller housing; The permanent magnet excitation is arranged in the one rotating hub; The armature and the water guide pipe are arranged in the fixed hub; The one fixed hub is fixed to the surface of the guide vane located on the axial center side of the upstream pipe. 8. The hydroelectric power generation device according to claim 7, wherein: The aqueduct is provided in both the fixed hub and the rotating hub; The water guide tube of the one fixed hub and the water guide tube of the one rotating hub are coaxially arranged in the axial direction of the impeller casing. 9. The hydroelectric power generation device according to claim 8, wherein: The diameter of the aqueduct of the fixed hub is longer than the diameter of the aqueduct of the rotating hub. 10. The hydroelectric power generation device according to any one of claims 7 to 9, characterized in that, having a discharge port for guiding water discharged from the water guide pipe of the one fixed hub to the impeller on the outer peripheral side of the rotating hub; The drain port is formed such that an outer peripheral portion of a downstream end surface of the one fixed hub is curved downstream, and an outer peripheral portion of an upstream end surface of the rotating hub is curved downstream. 11. The hydroelectric power generation device according to claim 1, wherein: The hub is divided into two fixed hubs fixed to the upstream piping and the downstream piping along the axial direction of the impeller housing, and one rotating hub fitted to the impeller; The permanent magnet excitation is arranged in the one rotating hub; The armatures are arranged on both sides of the two fixed hubs; Two sides of the two fixed hubs and the rotating hub have a water guide pipe that runs through the axial direction; The water guide pipes on both sides of the two fixed hubs are arranged coaxially with the water guide pipes of the rotating hub in the axial direction of the impeller housing. 12. The hydroelectric power generation device according to claim 1, wherein: The hub is divided into two fixed hubs fixed to the upstream piping and the downstream piping along the axial direction of the impeller housing, and one rotating hub fitted to the impeller; One of the two fixed hubs is provided with an excitation regulator and a power transmission winding for transmitting AC power output from the excitation regulator; The one rotating hub is provided with a power receiving coil opposite to the power transmitting coil, a rectifier for rectifying the received AC power in the power receiving coil, and a rectifier that is excited by the DC power output from the rectifier. electromagnet excitation; The other fixed hub of the two fixed hubs is provided with an armature opposite to the electromagnet excitation; Both sides of the two fixed hubs and the rotating hub have aqueducts penetrating in the axial direction; The two water guide pipes of the two fixed hubs and the water guide pipes of the rotating hub are arranged coaxially in the axial direction of the impeller housing.