WO2013153763A1 - 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 generator

The present invention relates to a hydroelectric generator that is used by being attached to a water channel (in many cases, a water pipe).

As disclosed in Patent Document 1, it has a structure in which the generator part is arranged in a ring shape outside the water wheel, and without creating a dam, water and sewage, small river, agricultural waterway, factory drainage channel, etc. Hydropower generators have been developed that are used by being installed in channels with different elevations that have not been used in the past. This hydroelectric power generation apparatus is a clean energy supply source, and has attracted attention as one of means for realizing energy local production for local consumption in places where it is difficult to install transmission lines from existing power plants such as mountainous areas.

FIG. 17 is a cross-sectional view showing the structure of the hydroelectric generator disclosed in Patent Document 1 and its cooling mechanism. An annular stator 306 having an armature coil 305a wound around an armature core 305b includes an upstream pipe 310 attached to the upstream water passage WT1 and a downstream pipe 312 attached to the downstream water passage WT2. It is provided so as to surround the outer periphery of the engaged casing 308. A cooling mechanism 315 for cooling the heat generated by the armature coil 305a and the armature core 305b is provided so as to surround the outer periphery of the annular stator 306.

Further, an annular rotor (runner) 303 having a permanent magnet 304 attached to the outer periphery and a propeller blade protruding radially inward from the inner periphery on the inner periphery is rotatable inside the stator 306. It is provided as follows. Further, a boss 302 for guiding the water flow is fixed to the inner wall side of the upstream pipe 310 on the central axis of the casing 308 where the upstream pipe 310 and the downstream pipe 312 are engaged. Further, a guide vane 301 that guides the water flow entering the rotor 303 in a direction that matches the inclination of the propeller blade of the rotor 303 is provided between the outer peripheral surface of the boss 302 and the inner wall of the upstream pipe 310. Further, a water-lubricated bearing 307 is provided so as to face both side surfaces of the annular ring raised at the center of the outer periphery of the rotor 303.

The cooling mechanism 315 includes a loop pipe 316a laid around the outer circumference of the annular stator 306, and a water flow that bypasses the upstream pipe 310 and supplies water to the inflow portion of the loop pipe 316a. An inlet pipe 316b and a water discharge pipe 316c for returning water discharged from the discharge portion of the loop pipe 316a to the downstream pipe 312 are provided.

JP 2006-189014 A

When attempting to increase the power generation capacity or increase the density of the generator with the structure of the hydroelectric generator shown in FIG. 17, the current is increased and the magnetic field is increased, and the copper loss of the armature coil 305 a in the stator 306 is reduced. The amount of heat generated by the iron loss of the armature core 305b increases. For this reason, in the above-described case, a stronger cooling mechanism 315 is required. Then, since the cooling mechanism 315 has a structure including an outside water channel facility such as a loop pipe 316a laid around the outer periphery of the annular stator 306, the cooling mechanism 315 is enlarged and the structure is complicated. This will increase the cost. *

The present invention has been made in order to solve such a problem, and the object thereof is simple and low-cost that can be efficiently cooled with respect to an increase in heat generation amount accompanying an increase in power generation capacity or a higher density of generators. Another object is to provide a hydroelectric generator with a cooling mechanism.

In order to solve the above-described problems, a hydroelectric power generation device used by being attached to a water channel according to an embodiment of the present invention includes an upstream pipe and a downstream pipe attached to the water channel, the upstream pipe, and the A runner casing sandwiched between the downstream pipe, a boss disposed in the axial direction of the runner casing, and a runner casing accommodated in the runner casing so as to be rotatable about the axis of the runner casing. The boss is divided into a rotating boss and at least one fixed boss, the rotating boss is fitted to the runner, and the at least one fixed boss is in the runner casing with respect to the rotating boss. The armature is disposed on the at least one fixed boss, and the at least one fixed boss is disposed on the rotating boss. Serial permanent magnet field 磁又 to armature facing is installed electromagnet magnetic field, said at least one fixed boss, conduit penetrating in the axial direction is provided, it is intended.

According to the above configuration, for example, the rotating boss in which the permanent magnet field of the generator is installed is fitted to the runner, and the generator armature is installed in a fixed boss separate from the rotating boss. The runner and generator part (rotating boss, fixed boss) can be designed / manufactured independently. In this case, an appropriate generator portion can be designed / manufactured according to the flow rate and flow velocity of the water channel regardless of the size of the water channel.

Also, as the cooling mechanism of the hydroelectric generator, a water conduit installed on one fixed boss of the 1 unit fixed boss or the 2 unit fixed boss where the armature is installed is adopted. An armature (for example, an armature coil wound around an armature core) is installed in a limited space of one fixed boss of the one unit fixed boss or the two unit fixed boss where the armature is installed. Therefore, heat tends to accumulate around the axis of the fixed boss where the armature is installed. Therefore, as described above, if the water guide pipe is penetrated in the axial direction in the fixed boss in which the armature is installed, the heat accumulated around the axis of the fixed boss in which the armature is installed is efficiently cooled. It becomes possible. In particular, when it is desired to increase the power generation capacity or increase the density of the generator, the current increases and the magnetic field increases, so the amount of heat generated by the copper loss and iron loss of the armature increases. Therefore, if the heat generation around the axis of the fixed boss is efficiently cooled by the water guide pipe penetrating through the fixed boss, the power generation efficiency is improved accordingly. Therefore, the introduction cost of the hydroelectric generator according to the present invention is reduced. Further reduction is possible.

In addition, when trying to introduce a cooling mechanism of a conventional hydroelectric generator, it is necessary to lay cooling water pipes in the fixed boss where the armature is installed, which complicates the structure of the entire cooling mechanism, and the outside of the waterway equipment. It will increase.

As described above, it is possible to provide a simple and low-cost hydroelectric generator with a cooling mechanism that can be efficiently cooled with respect to an increase in heat generation amount accompanying an increase in power generation capacity or a higher density generator.

The hydroelectric generator has a guide vane fixed to an inner wall of the upstream pipe, and the boss is fixed to the upstream pipe and the downstream pipe along the axial center direction of the runner casing. 2 units of fixed bosses and 1 unit of rotating bosses fitted to the runner. The one unit of rotating bosses is provided with the permanent magnet field, One fixed boss is provided with the armature and the water conduit, and one of the two unit fixed bosses having the water conduit is fixed to an inner wall of the downstream pipe, Of the two unit fixed bosses, the other fixed boss not having the water conduit may be fixed to the surface of the guide vane 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 boss to the guiding tube of the downstream fixed boss, the rotating boss and the downstream fixing are fixed as compared with the case where the downstream fixed boss is not provided with the conduit. Since the water flow passing through the gap with the boss increases, the armature installed on the downstream fixed boss can be efficiently cooled. Moreover, a simple and low-cost cooling mechanism is realized by installing the water guide pipe only on the fixed boss on the downstream side where the armature that generates heat during power generation is installed.

In the hydroelectric power generation device, the hydroelectric generator has a water intake for guiding the water flow on the outer peripheral side of the rotating boss in the runner casing to the water conduit of the one fixed boss, and the water intake is the one fixed boss. The diameter of the upstream end face is longer than the diameter of the downstream end face of the rotating boss, and the outer peripheral edge of the upstream end face of the one fixed boss is curved upstream. It is good.

According to the above configuration, since the water intake is provided, more water flow on the outer peripheral side of the rotating boss in the runner casing (water flow that has passed through the runner) can be guided to the water guide pipe of the fixed boss on the downstream side. The cooling performance of the cooling mechanism is further improved.

In the hydroelectric generator, an upstream end surface of the one fixed boss having the water conduit is provided between the outer peripheral edge of the upstream end surface and the armature to the inlet of the water conduit. It is also possible that a water supply groove is formed.

According to the above configuration, by providing the water supply groove, it is possible to increase the amount of water flowing from the outer peripheral side of the rotating boss in the runner casing to the water guide pipe of the downstream fixed boss. Moreover, since the surface area of the fixed boss which contacts water with the water supply groove can be increased, the cooling performance of the cooling mechanism can be further improved.

In the hydroelectric generator, the two unit fixed bosses and the rotating bosses have the water conduits, and the two unit fixed bosses and the rotating boss conduits are formed on the runner casing. It is good also as arrange | positioning so that it may become coaxial in an axial center direction.

According to the above configuration, in addition to the water (water that has passed through the runner) around the armature installed on the downstream fixed boss from the outer peripheral side of the rotating boss in the runner casing, the upstream fixed boss and Since the water that has passed through the water conduits of the rotating bosses flows, the cooling efficiency of the cooling mechanism can be further improved.

In the hydroelectric generator, the diameter of the conduit pipe of the fixed boss of the two units may be longer than the diameter of the conduit pipe of the rotating boss.

According to the above-described configuration, the diameter of the water conduit of the fixed boss on the upstream side is longer than the diameter of the rotating boss, so that the water flow from the drain of the conduit of the fixed boss to the inlet of the conduit of the rotating boss In addition, it is easy to generate a water flow from the drain of the conduit pipe of the fixed boss toward the runner on the outer periphery of the rotating boss. For this reason, since the water flow which hits a runner increases, the improvement of power generation efficiency will be aimed at with the improvement of the cooling performance of a cooling mechanism.

On the other hand, by setting the diameter of the downstream fixed boss conduit to be longer than the diameter of the rotating boss, the downstream fixed boss conduit is rotated in addition to the water flow discharged from the rotating boss conduit. It becomes easy to guide the water flow around from the outer periphery of the boss. For this reason, the water flow which passes the clearance gap between a rotation boss | hub and a downstream fixed boss | hub increases, and the armature installed in the downstream fixed boss | hub can be cooled more efficiently.

The hydroelectric generator has a guide vane fixed to the inner wall of the upstream pipe, and the boss is fixed to the upstream pipe along the axial direction of the runner casing. The unit is divided into a boss and a rotating boss of one unit fitted to the runner, the permanent magnet field is installed on the rotating boss of the one unit, and the armature and The water conduit may be installed, and the fixed boss of the one unit may be fixed to the surface of the guide vane on the axial center side of the upstream pipe.

According to the above configuration, since the guide vane is usually fixed to the upstream pipe, the hydroelectric generator is more preferably fixed to the fixed boss in which the armature is installed via the guide vane on the upstream pipe. The configuration is simplified. Specifically, by inserting a power cable inside the guide vane, the electromotive force generated in the armature installed on the fixed boss can be taken out of the water channel via the power cable. Become.

In addition, since the water flow in the radial direction of each boss is generated in the gap between the fixed boss and the rotating boss, the surface area of the armature that comes into contact with water is increased, so that the cooling performance of the cooling mechanism is further improved. be able to.

In the hydroelectric power generation apparatus, the one unit fixed boss and the one unit rotating boss have the water conduits, and the one unit fixed boss conduit and the one unit rotating boss conduit are It is good also as arrange | positioning so that it may become coaxial in the axial center direction of the said runner casing.

According to the above configuration, the water passing through the water guide pipe in the fixed boss on the upstream side is smoothly guided to the water guide pipe in the rotary boss on the downstream side, so that the armature installed on the fixed boss is surrounded by The amount of flowing water increases and the armature can be cooled efficiently.

In the hydroelectric generator, the diameter of the water conduit of the fixed boss of the one unit may be longer than the diameter of the water conduit of the rotating boss.

According to the above configuration, the diameter of the conduit of the fixed boss on the upstream side is longer than the diameter of the conduit of the rotating boss on the downstream side, so that the conduit of the rotating boss from the drain of the conduit of the fixed boss In addition to the water flow toward the inlet, the water flow toward the runner on the outer periphery of the rotating boss from the drain port of the water conduit of the fixed boss is likely to occur. For this reason, since the water flow which hits a runner increases, the improvement of the power generation efficiency is achieved with the improvement of the cooling performance of the cooling mechanism.

In the hydroelectric power generation device, the hydroelectric power generator has a drainage port for guiding the water flow discharged from the water conduit of the fixed boss of the one unit to the runner on the outer peripheral side of the rotating boss, The outer peripheral edge of the downstream end face of the fixed boss may be curved downstream, and the outer peripheral edge of the upstream end face of the rotating boss may be curved downstream.

According to the above configuration, the water flow hitting the propeller blades on the inner periphery of the runner can be prevented from being disturbed by installing the drain outlet. That is, a simple and low-cost cooling mechanism can be realized without impairing the power generation characteristics of the hydroelectric generator. *

In the hydroelectric generator, the boss is a unit of one unit fitted to the runner and two units of fixed bosses fixed to the upstream side pipe and the downstream side pipe along the axial direction of the runner casing. The permanent magnet field is installed on the rotating boss of the one unit, the armature is installed on both the fixed bosses of the two units, and the rotating boss of the two units and the rotating boss are rotated. The boss has a water conduit penetrating in the axial direction, and the water conduits of both the fixed bosses of the two units and the water conduit of the rotating boss are arranged so as to be coaxial in the axial direction of the runner casing. It may be. *

According to the above configuration, since the armature is installed on both of the two unit fixed bosses fixed to the upstream side pipe and the downstream side pipe, the power generation capacity can be further increased. Further, since the water conduits of the fixed bosses and the rotary bosses of the two units are coaxially arranged, the water passing through the water conduits in the upstream fixed bosses is respectively in the rotary boss and the downstream fixed boss. As the water guide pipe is smoothly guided, the amount of water flowing around the armature installed on the upstream fixed boss and the armature installed on the downstream fixed boss increases, and these armatures are cooled efficiently. can do.

In the hydroelectric generator, the boss is a unit of one unit fitted to the runner and two units of fixed bosses fixed to the upstream side pipe and the downstream side pipe along the axial direction of the runner casing. The fixed boss is divided into a rotating boss, and one of the two unit fixed bosses is provided with a field regulator and a power transmission coil for transmitting AC power output from the field regulator, The rotating boss of one unit includes a power receiving coil disposed opposite to the power transmitting coil, a rectifier that rectifies AC power received by the power receiving coil, and an electromagnetic field excited by DC power output from the rectifier. The other fixed boss of the two units is provided with an armature so as to be opposed to the electromagnet field, and the two units are fixed. Both the bosses and the rotating boss have a water conduit that penetrates in the axial direction, and the water conduits of both the fixed bosses of the two units and the water conduit of the rotating boss are coaxial in the axial direction of the runner casing. It is arranged so that

According to the above configuration, the structure of the synchronous generator of the electromagnetic field type is used instead of the permanent magnet field type. Therefore, when the power generation capacity is increased, an expensive permanent magnet field is used as compared with the electromagnetic field. No need. In addition, it is possible to cope with an arbitrary power generation capacity by adjusting the field, and it is not necessary to design / manufacture a hydroelectric power generation apparatus corresponding to each power generation capacity. In addition, heat sources (power transmission coil, power reception coil, electromagnet field, armature) are installed in the upstream fixed boss, the rotating boss, and the downstream fixed boss. By being arranged on the same axis, heat accumulated around the axis of each boss can be efficiently cooled.

According to the present invention, it is possible to provide a simple and low-cost hydroelectric generator with a cooling mechanism that can be efficiently cooled with respect to an increase in power generation capacity and an increase in calorific value accompanying an increase in generator density.

FIG. 1 is a cross-sectional view showing a configuration example of a hydroelectric generator that is used in a water channel according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing an installation example of permanent magnet fields installed on the rotor of the hydroelectric generator shown in FIG. 1 and an installation example of armatures installed on the stator of the hydroelectric generator shown in FIG. FIG. 3 is a diagram schematically showing the heat distribution in the stator of the hydroelectric generator. FIG. 4 is a diagram showing a water flow guided by a water conduit set in the stator of the hydroelectric generator shown in FIG. FIG. 5 is a diagram showing an installation example of the water intake in the first embodiment of the present invention. FIG. 6 is a diagram showing an installation example of a water supply groove in the first embodiment of the present invention. FIG. 7A is a diagram showing another installation example of the water supply groove in the first embodiment of the present invention. FIG. 7B is a diagram showing a state in which water flows into the conduit pipe of the fixed boss in which the water supply groove shown in FIG. 7A is installed. FIG. 8 is a diagram showing an installation example in which all the bosses in the first embodiment of the present invention are penetrated by the water conduit. FIG. 9 is a diagram showing another installation example in which all the bosses in the first embodiment of the present invention are penetrated by the water conduit. FIG. 10 is a cross-sectional view showing a configuration example of a hydroelectric generator that is used in a water channel according to Embodiment 2 of the present invention. FIG. 11 is a diagram showing an installation example in which all the bosses in the second embodiment of the present invention are penetrated by the water conduit. FIG. 12 is a diagram showing another installation example in which all the bosses in the second embodiment of the present invention are penetrated by the water conduit. FIG. 13 is a diagram illustrating an installation example of a drain outlet according to the second embodiment of the present invention. FIG. 14 is a cross-sectional view showing a configuration example of a hydroelectric generator that is used by being attached to a waterway according to Embodiment 3 of the present invention. FIG. 15 is a cross-sectional view illustrating a configuration example of a hydroelectric generator that is used in a water channel according to Embodiment 4 of the present invention. FIG. 16 is a block diagram illustrating a configuration example in the two-unit fixed boss and the one-unit rotating boss of the hydroelectric generator shown in FIG. 15. FIG. 17 is a cross-sectional view showing the structure of a conventional hydroelectric generator and its cooling mechanism.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted.

(Embodiment 1)
[Configuration example of hydroelectric generator]
FIG. 1 is a cross-sectional view showing a configuration example of a hydroelectric generator that is used in a water channel according to Embodiment 1 of the present invention. 2 shows an example of the permanent magnet field installed on the rotor (rotating boss 4b described later) of the hydroelectric generator shown in FIG. 1 and the stator (fixed boss 4c described later) of the hydroelectric generator shown in FIG. It is a figure which shows the example of installation of the armature installed. FIG. 3 is a diagram schematically showing the heat distribution in the stator of the hydroelectric generator. FIG. 4 is a diagram showing a water flow guided by a water conduit set in the stator of the hydroelectric generator shown in FIG.

A hydroelectric generator 100 shown in FIG. 1 includes an upstream pipe 1 attached (connected) to an upstream water channel WT1, a downstream pipe 2 attached (connected) to a downstream water channel WT2, and an upstream pipe 1 and a downstream. An annular runner casing 3 sandwiched between the side pipe 2 and a streamline arranged in the axial direction of the runner casing 3 to guide the water flow toward the inner wall of the upstream side pipe 1 and increase the flow velocity. A fixed boss (4a, 4b, 4c), an annular runner 5 accommodated in the runner casing 3 so as to be rotatable around the axis of the runner casing 3, and an inner wall of the upstream pipe 1 are fixed. A guide vane 6a provided and a boss fixing member 6b fixed to the inner wall of the downstream pipe 2 are provided. A plurality of propeller blades projecting from the radially inner side of the runner 5 are disposed, and the guide vanes 6 a play a role of guiding the water flow in a direction that matches the inclination of the plurality of propeller blades of the runner 5.

As shown in FIG. 1, the streamlined bosses (4a, 4b, 4c) are one unit bosses fixed to the upstream pipe 1 in the axial direction of the runner casing 3 (hereinafter referred to as fixed bosses). 4a, one unit boss (hereinafter referred to as a rotating boss) 4b fitted into the circular opening of the runner 5, and one unit boss (hereinafter referred to as a fixed boss) fixed to the downstream pipe 2. ) 4c. The armature 70 is installed on the fixed boss 4c, and the permanent magnet field 80 having a plurality of magnetic poles is installed on the rotating boss 4b so as to face the armature 70. Specifically, the fixed boss 4a is fixed to the surface of the guide vane 6a on the axial center side of the upstream pipe 1 so that the fixed boss 4a is connected to the inner wall of the upstream pipe 1 via the guide vane 6a. It is in a fixed state. Further, the rotating boss 4 b is fitted into the circular opening of the runner 5, so that it can rotate integrally with the runner 5. Further, the fixed boss 4c is fixed to the surface of the boss fixing member 6b on the axial center side of the downstream pipe 2 so that the fixed boss 4c is fixed to the inner wall of the downstream pipe 2 via the boss fixing member 6b. It has become a state.

FIG. 2 shows an installation example of the permanent magnet 8 and the laminated electrical steel sheet 9 forming the permanent magnet field 80 in the rotating boss 4b, and an installation example of the armature coil 7a and the armature core 7b forming the armature 70 in the fixed boss 4c. Has been.

In FIG. 2, as an example of installation of the permanent magnet 8 and the laminated electromagnetic steel sheet 9, the arrangement seen from the outer peripheral side surface of the cylindrical rotating boss 4 b and the arrangement seen from the circular cross section of the rotating boss 4 b correspond by broken lines. It is attached. A permanent magnet 8 having a plurality of magnetic poles is embedded in the rotary boss 4b as seen from the circular cross section of the rotary boss 4b. Note that a laminated electromagnetic steel sheet 9 formed by laminating a plurality of annular electromagnetic steel sheets is attached to both planes of the permanent magnet 8 on the inner side when viewed from the cross section of the rotating boss 4b. As a type by the magnetic poles of the permanent magnet 8, a pair of N poles / S poles is a four pole type in which a gap is provided for each magnetic pole and separated. In addition, a two-pole type in which one set of N poles / S poles is separately provided with a gap, and an eight-pole type in which four sets of N poles / S poles are provided with a gap for each magnetic pole, or A ring-shaped permanent magnet in which four sets of N poles / S poles are continuously arranged in a ring shape without providing a gap for each magnetic pole may be adopted. A cylindrical permanent magnet may be employed in which the fan-shaped N pole / S pole are continuously arranged along the circumferential direction of the laminated electromagnetic steel sheet 9 without providing a gap for each magnetic pole. In addition, since the number of poles is determined by the specification, it is not limited to the number of poles exemplified as described above.

Further, in FIG. 2, as an installation example of the armature coil 7a and the armature core 7b, there are an arrangement seen from the outer peripheral side surface of the dome-shaped fixed boss 4c and an arrangement seen from the circular cross section of the fixed boss 4c. Corresponding by a broken line. In the circular cross section of the fixed boss 4c, a plurality of (for example, six) armature coils 7a are disposed at equal intervals (for example, at intervals of 60 degrees) along the circumferential direction of the circular cross section. . The planar shape of the armature core 7b around which the armature coil 7a is wound is circular. In addition, you may employ | adopt the armature core used as a fan-shaped or rectangular planar shape. In addition, since the number of armature coils 7a and armature cores 7b is determined by the specification, it is not limited to the number exemplified as described above. The armature 70 is not limited to a form in which the armature coil 7a is wound around the outer periphery of the armature core 7b, but may be a form of an empty armature coil 7a without the armature core 7b.

Moreover, the hydroelectric generator 100 shown in FIG. 1 includes water-lubricated bearings 30 a and 30 b on the outer periphery of the runner 5. The water-lubricated bearings 30a and 30b are bearings lubricated using water flowing through the water channel, and have features such as complete non-contact of the runner 5, suppression of vibration and noise, and oillessness. The ceramic is sprayed on the sliding surface of the runner 5 with the outer peripheral curved surface. In addition, the water-lubricated bearings 30a and 30b may be formed of a ceramic solid.

Furthermore, the hydroelectric generator 100 shown in FIG. 1 includes a water guide pipe 40 that penetrates the fixed boss 4c in which the armature 70 is installed in the axial direction of the fixed boss 4c. As shown in FIG. 2, since the armature coil 7a and the armature core 7b forming the armature 70 are installed at a high density in a space where the circular cross section of the fixed boss 4c is limited, the axis of the fixed boss 4c Heat tends to accumulate around the heart. FIG. 3 is a diagram schematically showing the heat distribution in the fixed boss 4c of the hydroelectric generator. Specifically, the darker the shade, the higher the temperature. Therefore, in order to efficiently cool the heat accumulated around the axis of the fixed boss 4c on which the armature 70 is installed, the water guide pipe 40 penetrating in the axial direction in the fixed boss 4c on which the armature 70 is installed. Is provided.

In addition, as FIG. 4 shows, the water flow which passed the runner 5 in the outer periphery of the rotation boss | hub 4b passes the clearance gap between the rotation boss | hub 4b and the fixed boss | hub 4c, and also of the water conduit 40 of the fixed boss | hub 4c. Guided to the inflow. Therefore, compared with the case where the water conduit 40 is not installed, the area where the armature 70 installed on the fixed boss 4c is in contact with the water flow is increased by the area in contact with the water conduit 40.

The hydroelectric generator 100 having the above-described structure is configured such that the rotating boss 4b provided with the permanent magnet field 80 of the generator is fitted to the runner 5 and the stationary boss 4c separate from the rotating boss 4b is connected to the generator. The runner 5 and the generator part (the rotating boss 4b and the fixed boss 4c) can be designed / manufactured independently. For this reason, regardless of the size of the water channel, the generator portion corresponding to the flow rate and flow velocity of the water channel can be appropriately designed / manufactured.

Further, as the cooling mechanism of the hydroelectric generator 100, the water guide pipe 40 penetrating in the axial direction of the fixed boss 4c is adopted in the fixed boss 4c where the armature 70 is installed. As a result, it is possible to efficiently cool the heat accumulated around the axis of the fixed boss 4c on which the armature 70 is installed. 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 magnetic field is strong, so that the amount of heat generated by the copper loss of the armature coil 7a and the iron loss of the armature core 7b increases. To do. Therefore, since the heat generation around the axis of the fixed boss 4c can be efficiently cooled by the water conduit 40 penetrating through the fixed boss 4c, and the power generation efficiency can be increased accordingly, the hydroelectric power generator according to the present invention The introduction cost can be further reduced.

Further, compared with the case where the water guide pipe 40 is not provided in the fixed boss 4c, the hydroelectric generator 100 is fixed to the rotating boss 4b when guiding the water flow from the outer periphery of the rotating boss 4b to the water guide pipe 40 of the fixed boss 4c. The water flow passing through the gap between the boss 4c increases, and the surfaces of the armature coil 7a and the armature core 7b installed on the fixed boss 4c can be cooled more efficiently.

Moreover, a simple and low-cost cooling mechanism is realized by installing the water conduit 40 only on the fixed boss 4c on which the armature 70 that generates heat during power generation is installed.

From the above, a simple and low-cost hydroelectric generator 100 with a cooling mechanism that can be efficiently cooled with respect to an increase in power generation capacity and an increase in calorific value accompanying an increase in the density of the generator has been realized.

[Example of water intake installation]
FIG. 5 is a diagram showing an installation example of the water intake in the first embodiment of the present invention. As shown in FIG. 5, the hydroelectric generator 100 shown in FIG. 1 is provided with a water intake 50 that guides the water flow on the outer peripheral side of the rotating boss 4 b in the runner casing 3 to the water conduit 40 of the fixed boss 4 c. The intake port 50 has a diameter r2 of the end face on the upstream side (side where the armature 70 is installed) of the fixed boss 4c and the end face on the downstream side (side where the permanent magnet field 80 is installed) of the rotating boss 4b. It is longer than the diameter r1 and is formed by curving the outer peripheral edge of the upstream end face of the fixed boss 4c upstream. The shape of the water intake 50 is not limited to the shape shown in FIG. 5, and may be any shape that can easily guide the water flow on the outer peripheral side of the rotating boss 4 b in the runner casing 3 to the water conduit 40 of the fixed boss 4 c.

By providing the water intake 50 for guiding the water flow to the water conduit 40 of the fixed boss 4c as described above, the water flow on the outer peripheral side of the rotating boss 4b in the runner casing 3 (water flow that has passed through the runner 5) is fixed. Since more guidance can be provided by the water conduit 40 of 4c, the cooling performance of the hydroelectric generator 100 can be further improved.

[Installation example of water ditch]
FIG. 6 is a diagram showing an installation example of the water supply groove in the first embodiment of the present invention.

As shown in FIG. 6, in the hydroelectric generator 100 shown in FIG. 1, the water guide pipe 40 passes between the armature 70 from the outer peripheral edge of the upstream end face of the fixed boss 4 c having the water guide pipe 40. A water supply groove 60 leading to the inflow port is formed. In addition, the shape (trajectory) of the length direction of the water supply groove | channel 60 shown in FIG. 6 is linear. In other words, the water supply groove 60 shown in FIG. 6 is formed radially and straight from the inlet of the water conduit 40 when viewed from the upstream end face of the fixed boss 4c. Further, the water supply groove 60 shown in FIG. 6 has an inlet of the water conduit 40 from the outer peripheral side of the upstream end face of the fixed boss 4c so that a large amount of water is smoothly guided to the inlet of the water conduit 40. The depth of the groove is gradually increased toward the top, and the depth of the groove near the inlet of the water conduit 40 is maximized.

FIG. 7A is a diagram showing another installation example of the water supply groove in the first embodiment of the present invention. Although the shape in the length direction of the water supply groove 60 shown in FIG. 6 is linear, the shape (trajectory) in the length direction of the water supply groove 62 shown in FIG. 7A is spiral. In other words, the water supply groove 62 shown in FIG. 7A is formed in a radial and curved manner from the inlet of the water conduit 40 when viewed from the upstream end face of the fixed boss 4c. Further, similarly to the water supply groove 60 shown in FIG. 6, the water guide pipe 40 is connected to the inlet of the water guide pipe 40 from the outer peripheral edge of the upstream end face of the fixed boss 4 c so that a large amount of water flow is guided smoothly to the inlet of the water guide pipe 40. The depth of the groove gradually increases toward the inflow port, 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 in which water flows into the conduit pipe of the fixed boss in which the water supply groove shown in FIG. 7A is installed.

In addition, it is not restricted to the shape (trajectory) or the way of digging (how to change the depth of the groove) of the water supply grooves 60 and 62 shown in FIGS. 6 and 7A, and smoothly to the inlet of the water conduit 40. And if a water flow is guided in large quantities, the shape and digging method of various length directions can be employ | adopted.

By providing the linear or spiral water supply groove (60, 62) as described above, the outer peripheral side of the rotating boss 4b in the runner casing 3 is compared with the case where the water supply groove (60, 62) is not provided. Thus, the amount of water flowing into the conduit 40 of the fixed boss 4c can be increased. Moreover, the surface area of the fixed boss | hub 4c which contacts water with the water supply groove | channel (60, 62) can be expanded. Therefore, the cooling performance of the hydroelectric generator 100 can be further improved.

Moreover, even if the clearance gap between the rotation boss | hub 4b and the fixed boss | hub 4c is narrow by providing a water supply groove | channel (60, 62), sufficient inflow of the water to the water conduit 40 of the fixed boss | hub 4c is obtained. It has become easier. For this reason, since the facing distance between the permanent magnet field 80 of the rotating boss 4b and the armature 70 of the fixed boss 4c can be shortened, the leakage flux is reduced accordingly, and the power generation efficiency of the hydroelectric generator 100 is further improved. be able to.

In the hydroelectric power generation apparatus 100 shown in FIG. 1, if the water intake (50) as shown in FIG. 5 is combined with the water supply grooves (60, 62) as shown in FIGS. Compared with the case where only one of (50) and the water supply grooves (60, 62) is provided, the amount of water flowing into the conduit 40 of the fixed boss 4c from the outer peripheral side of the rotating boss 4b in the runner casing 3 Can be further increased. Thereby, the cooling performance of the hydroelectric generator 100 can be further improved.

[Installation example in which all bosses are penetrated by water conduit]
FIG. 8 is a diagram showing an installation example in which all the bosses in the first embodiment of the present invention are penetrated by the water conduit.

As shown in FIG. 8, in the hydroelectric generator 100 shown in FIG. 1, not only the fixed boss 4c in which the armature 70 is installed, but also the fixed boss 4a and the rotating boss 4b are guided in their axial directions. Water pipes 41 and 42 are provided. Further, the water guide pipe 41 of the fixed boss 4 a, the water guide pipe 42 of the rotating boss 4 b, and the water guide pipe 40 of the fixed boss 4 c are arranged so as to be coaxial in the axial direction of the runner casing 3. In addition, about the other structure of the hydroelectric generator 100 shown in FIG. 8, it is the same as the structure of the hydroelectric generator 100 shown in FIG.

As described above, if all the bosses (4a, 4b, 4c) are penetrated by the water guide pipes (41, 42, 40), the armature 70 installed on the fixed boss 4c has the inside of the runner casing 3. The water that has passed through the water guide pipes 41 and 42 of the fixed boss 4a and the rotating boss 4b in addition to the water (water that has passed through the runner 5) that circulates from the outer peripheral side of the rotating boss 4b of the rotating boss 4b can be easily hit. The cooling performance can be further improved. Note that the water flow that has passed from the upstream pipe 1 to the outer periphery of the fixed boss 4 a passes through the outer periphery of the fixed boss 4 c of the downstream pipe 2 after rotating the runner 5. At this time, according to Bernoulli's theorem, the pressure of the water flow flowing through the downstream pipe 2 is lower than the pressure of the water flow flowing through the upstream pipe 1, so that the upstream pipe 1 is connected to the downstream side without a special circulation mechanism. Water can be pumped toward the conduits (41, 42, 40) of all the bosses (4a, 4b, 4c) toward the pipe 2.

FIG. 9 is a diagram showing another installation example in which all the bosses in the first embodiment of the present invention are penetrated by a water conduit.

As shown in FIG. 9, in the hydroelectric generator 100 shown in FIG. 1, the diameter of the water conduit 41 of the fixed boss 4a is designed to be longer than the diameter of the water conduit 42 of the rotating boss 4b. As a result, in addition to the water flow from the drain outlet of the water conduit 41 of the fixed boss 4a to the inlet of the water conduit 42 of the rotating boss 4b, the runner on the outer periphery of the rotating boss 4b from the drain of the water conduit 41 of the fixed boss 4a. The water flow toward 5 is likely to occur. For this reason, as the water flow that hits the runner 5, in addition to the normal water flow that passes through the outer periphery of the fixed boss 4a from the upstream toward the downstream, the water flow that has passed through the gap between the fixed boss 4a and the rotating boss 4b increases. As will be described later with reference to FIGS. 14 and 15, when an armature or the like is installed between the fixed boss 4a and the rotating boss 4b, the cooling efficiency is improved and the power generation efficiency is improved.

On the other hand, the diameter of the water conduit 40 of the fixed boss 4c is set to be longer than the diameter of the water conduit 42 of the rotating boss 4b. Thereby, in addition to the water flow discharged from the water guide pipe 42 of the rotating boss 4b, the water flow that has come around from the outer periphery of the rotating boss 4b is easily guided to the water guide pipe 40 of the fixed boss 4c. For this reason, the water flow which passes the clearance gap between the rotation boss | hub 4b and the fixed boss | hub 4c increases, and the armature 70 installed in the fixed boss | hub 4c can be cooled more efficiently.

As a modification of the hydroelectric generator 100 shown in FIGS. 8 and 9, at least one of the water intake (50) as shown in FIG. 5 and the water supply grooves (60, 62) as shown in FIGS. By providing either one, the amount of water flowing from the outer peripheral side of the rotating boss 4b in the runner casing 3 to the water conduit 40 of the fixed boss 4c can be further increased. Thereby, the cooling performance of the hydroelectric generator 100 can be further improved.

Further, as a modified example of the hydroelectric generator 100 shown in FIG. 9, a drain outlet 90 shown in FIG. 13 may be provided, although details will be described later. Thereby, disturbance of the water flow can be suppressed while increasing the water flow hitting the runner 5, and a simple and low-cost cooling mechanism can be realized without impairing the power generation characteristics of the hydroelectric power generation device 100 shown in FIG. *

(Embodiment 2)
[Configuration example of hydroelectric generator]
FIG. 10 is a cross-sectional view showing a configuration example of a hydroelectric generator that is used in a water channel according to Embodiment 2 of the present invention.

The hydroelectric generator 101 shown in FIG. 10 has a single unit fixed boss in which streamlined bosses (4a, 4b) are fixed to the upstream pipe 1 via guide vanes 6 in the axial direction of the runner casing 3. 4a and one unit of rotating boss 4b fitted into the circular opening of the runner 5 are divided into two. The fixed boss 4a is provided with an armature 70, and a water guide pipe 41 penetrating in the axial direction of the fixed boss 4a is set. The rotating boss 4b is provided with a plurality of magnetic poles so as to be opposed to the armature 70. A permanent magnet field 80 is provided. The guide vane 6 is provided with a through hole for drawing the power cable, and the electromotive force generated in the armature 70 installed on the fixed boss 4a is taken out of the water channel via the power cable in the guide vane 6. It is. Thus, since the guide vane 6 is normally fixed to the upstream pipe 1, the fixed boss 4 a in which the armature 70 is installed via the guide vane 6 is fixed to the upstream pipe 1. The configuration of the hydroelectric generator 101 is simplified.

The hydroelectric generator 101 having the above-described structure has the same effect as the hydroelectric generator 100 shown in FIG.

Specifically, the rotary boss 4b having the permanent magnet field 80 is fitted to the runner 5, and the armature 70 is installed on the fixed boss 4a. The runner 5 and the generator portion (the rotary boss 4b, The fixed boss 4a) can be designed / manufactured independently. This makes it possible to design / manufacture an appropriate generator portion according to the flow rate and flow velocity of the water channel regardless of the size of the water channel.

Further, as a cooling mechanism of the hydroelectric power generation apparatus 101, a water conduit 41 penetrating in the axial direction of the fixed boss 4a is employed in the fixed boss 4a in which the armature 70 is installed. This makes it possible to efficiently cool the heat accumulated around the axis of the fixed boss 4a on which the armature 70 is installed. In particular, when it is desired to increase the power generation capacity or increase the density of the generator, the current increases and the magnetic field increases, so the copper loss of the armature coil 7a constituting the armature 70 and the iron of the armature core 7b. The amount of heat generated by the loss increases. Therefore, if the heat generation around the axis of the fixed boss 4a is efficiently cooled by the water guide pipe 41 penetrating through the fixed boss 4a, the power generation efficiency is improved. It becomes possible.

Moreover, a simple and low-cost cooling mechanism is realized by installing the water guide pipe 41 only on the fixed boss 4a on which the armature 70 that generates heat during power generation is installed.

In addition, since the water flow in the radial direction of each boss is generated in the gap between the fixed boss 4a and the rotating boss 4b, the surface area of the armature 70 in contact with water is increased, so that the cooling performance can be further improved. .

As described above, a simple and low-cost hydroelectric generator 101 with a cooling mechanism that can be efficiently cooled with respect to an increase in power generation capacity and an increase in heat generation accompanying an increase in the density of the generator is realized.

[Installation example in which all bosses are penetrated by water conduit]
FIG. 11 is a diagram showing an installation example in which all the bosses in the second embodiment of the present invention are penetrated by the water conduit.

In the hydroelectric generator 101 shown in FIG. 11, not only the fixed boss 4a where the armature 70 is installed, but also the rotating boss 4b is provided with a water conduit 42 penetrating in the axial direction of the rotating boss 4b. Further, the water guide pipe 41 of the fixed boss 4 a and the water guide pipe 42 of the rotating boss 4 b are disposed so as to be coaxial in the axial direction of the runner casing 3.

As described above, if all the bosses (4a, 4b) are penetrated by the water guide pipes (41, 42), the water that passes through the water guide pipe 41 in the fixed boss 4a on the upstream side has the downstream boss. Since it is smoothly guided to the water guide pipe 42 in 4b, the amount of water flowing around the armature 70 installed on the fixed boss 4a increases, and the armature 70 can be efficiently cooled.

FIG. 12 is a diagram showing another installation example in which all the bosses in the second embodiment of the present invention are penetrated by a water conduit.

In the installation example shown in FIG. 11, the diameter of the water guide pipe 41 in the fixed boss 4a on the upstream side and the diameter of the water guide pipe 42 in the rotary boss 4b on the downstream side are the same length. In the installation example shown, the diameter of the water guide pipe 41 in the fixed boss 4a on the upstream side is longer than the diameter of the water guide pipe 42 in the rotating boss 4b on the downstream side. As a result, in addition to the water flow from the drain outlet of the water conduit 41 of the fixed boss 4a to the inlet of the water conduit 42 of the rotating boss 4b, the runner on the outer periphery of the rotating boss 4b from the drain of the water conduit 41 of the fixed boss 4a. The water flow toward 5 is generated. For this reason, as the water flow that hits the runner 5, in addition to the normal water flow that passes through the outer periphery of the fixed boss 4a from upstream to downstream, the water flow that has passed through the gap between the fixed boss 4a and the rotating boss 4b increases. In addition to improving the cooling performance, the power generation efficiency is improved.

FIG. 13 is a diagram showing an installation example of the drain outlet in the second embodiment of the present invention.

As shown in FIG. 13, the hydraulic power generation apparatus 101 shown in FIG. 12 includes a drain port 90 that guides the water flow discharged from the water conduit 41 of the fixed boss 4 a to the runner 5 on the outer peripheral side of the rotating boss 4 b. It has been. The drain port 90 is formed by curving the outer peripheral edge portion 91 of the downstream end face of the fixed boss 4a to the downstream side and the outer peripheral edge portion 92 of the upstream end face of the rotating boss 4b to the downstream side. . As a result, the water flow that has passed through the gap between the fixed boss 4 a and the rotating boss 4 b is discharged from the drainage port 90 by bending the trajectory downstream according to the degree of curvature of the drainage port 90.

If the diameter of the water guide pipe 41 of the fixed boss 4a is made longer than the diameter of the water guide pipe 42 of the rotating boss 4b, the runner 5 has a normal water flow passing through the outer periphery of the fixed boss 4a from upstream to downstream. The water flow passing through the gap between the fixed boss 4a and the rotating boss 4b hits. At this time, the turbulence of the water flow in which the normal water flow that has passed through the outer periphery of the fixed boss 4a and the water flow that has passed through the gap between the fixed boss 4a and the rotating boss 4b interfere and flow backward from the downstream side to the upstream side. Is likely to occur. Therefore, the water flow that has passed through the gap between the fixed boss 4a and the rotating boss 4b by the drain port 90 is discharged from the drain port 90 by bending the trajectory downstream, and interference with the water flow that has passed through the outer periphery of the fixed boss 4a. By considering so that they can be merged with each other, disturbance of the water flow hitting the runner 5 can be suppressed. As a result, a simple and low-cost cooling mechanism can be realized without impairing the power generation characteristics of the hydroelectric generator 101. *

(Embodiment 3)
FIG. 14 is a cross-sectional view showing a configuration example of the hydroelectric generator according to Embodiment 3 of the present invention.

The hydroelectric generator 102 shown in FIG. 14 is similar to the hydroelectric generator 100 shown in FIG. 1 in that the streamlined boss has two dome-shaped fixed bosses (4a, 4c) and one unit of cylindrical rotation. The boss 4b is divided into three parts. However, armatures (70a, 70b) are installed on both of the fixed bosses (4a, 4c), and the rotating boss 4b has a multi-pole permanent magnet field 80a disposed opposite to the armature 70a of the fixed boss 4a. The difference is that an armature 70b of the fixed boss 4c and a multi-pole permanent magnet field 80b arranged opposite to each other are installed. In the case of the hydroelectric generator 102 shown in FIG. 14, the generated power is taken out from the armature 70 a of the fixed boss 4 a fixed to the upstream pipe 1 via the guide vane 6 a and the boss is fixed to the downstream pipe 2. The generated power is taken out from the armature 70b of the fixed boss 4c fixed through the member 6b.

Further, since the armature (70a, 70b) serving as a heat source is installed in both the upstream fixed boss 4a and the downstream fixed boss 4c, the hydroelectric generator 100 shown in FIG. 8 and the hydroelectric generator shown in FIG. Similar to the device 101, all the bosses (4a, 4b, 4c) are penetrated by the water conduits (41, 42, 40).

In addition to using a permanent magnet field (80a, 80b) installed on the upstream cross section and the downstream cross section of the cylindrical rotating boss 4b as shown in FIG. You may use what has arrange | positioned the permanent magnet in the center part of the electromagnetic steel plate laminated body which laminated | stacked the electromagnetic steel plate. That is, the permanent magnet at the center of the electromagnetic steel sheet laminate may be commonly used as the permanent magnet of the generator for the upstream armature 70a and the downstream armature 70b of the rotating boss 4b.

14 is the same as that of the hydroelectric generator 100 shown in FIG. 1, and thus the description thereof is omitted.

According to the hydroelectric generator 102 having the structure described above, the armatures (70a, 70b) are installed on both the fixed bosses (4a, 4c) fixed to the upstream pipe 1 and the downstream pipe 2, respectively. As a result, the power generation capacity can be further increased. Further, since the water guide pipes (41, 40) of the fixed bosses (4a, 4c) and the water guide pipe 42 of the rotating boss 4b are coaxially arranged, water passing through the water guide pipe 41 in the upstream fixed boss 4a. Is smoothly guided to the respective water conduits (42, 40) in the rotating boss 4b and the downstream fixed boss 4c. For this reason, the amount of water flowing around the armature 70a installed on the upstream fixed boss 4a and the armature 70b installed on the downstream fixed boss 4c is increased, and these armatures (70a, 70b) are efficiently used. Can be cooled.

As a modification of the hydroelectric power generation device 102 shown in FIG. 14, in addition to passing all the bosses (4a, 4b, 4c) through the water conduits (41, 42, 40), a water conduit 42 is provided on the rotating boss 4b. Instead, the upstream fixed boss 4a and the downstream fixed boss 4c may be penetrated by the water guide pipes (41, 40).

Further, as a modification of the hydroelectric power generation device 102 shown in FIG. 14, at least one of a water intake (50) as shown in FIG. 5 and a water supply groove (60, 62) as shown in FIGS. By providing, the inflow amount of water from the outer peripheral side of the rotating boss 4b in the runner casing 3 to the water conduit 40 of the fixed boss 4c can be further increased. Thereby, the cooling performance of the hydroelectric generator 100 can be further improved.

Further, as a modification of the hydroelectric generator 102 shown in FIG. 14, a drain outlet (70) as shown in FIG. 13 may be provided. Thereby, the disturbance of the water flow which hits the runner 5 can be suppressed, and a simple and low-cost cooling mechanism can be realized without impairing the power generation characteristics of the hydroelectric generator 102 shown in FIG. *

(Embodiment 4)
FIG. 15 is a cross-sectional view illustrating a configuration example of a hydroelectric generator that is used in a water channel according to Embodiment 4 of the present invention. FIG. 16 is a block diagram illustrating a configuration example in the two-unit fixed boss and the one-unit rotating boss of the hydroelectric generator shown in FIG. 15.

The hydroelectric generator 103 shown in FIG. 15 has two streamlined bosses (4a, 4b, 4c), which are two unit fixed bosses, like the hydroelectric generator 100 shown in FIG. 1 and the hydroelectric generator 102 shown in FIG. (4a, 4c) and one unit of rotating boss 4b. However, the hydroelectric generator 100 shown in FIG. 1 and the hydroelectric generator 102 shown in FIG. 14 use the permanent magnet field 80 as the field pole of the generator, whereas the hydroelectric generator 103 shown in FIG. The difference is that the electromagnet field 14 is used as the field pole of the machine.

Specifically, the fixed boss 4a is provided with a field regulator 10 and a power transmission coil (induction coil) 11 that transmits AC power output from the field regulator 10. Further, the rotating boss 4 b is provided with a power receiving coil (induction coil) 12 disposed opposite to the power transmitting coil 11, a rectifier 13 that rectifies AC power received by the power receiving coil 12, and DC power output from the rectifier 13. And an electromagnet field 14 wound around an iron core to be excited. An armature 15 is installed on the fixed boss 4c so as to be opposed to the electromagnet field 14. 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. Thereby, an induced electromotive force is generated in the power receiving coil 12. The induced electromotive force is rectified to DC power by the rectifier 13 and supplied to the electromagnet field 14. Since the electromagnet field 14 functions as an electromagnet and rotates around the axis of the runner casing 3 together with the rotating boss 4b, an electromotive force is generated in the armature 15.

Further, both the fixed bosses 4a and 4c and the rotating boss 4b have water conduits (41, 42, 40) penetrating in the respective axial directions. The water guide pipe 41 of the fixed boss 4 a, the water guide pipe 42 of the rotating boss 4 b, and the water guide pipe 40 of the fixed boss 4 c are arranged so as to be coaxial in the axial direction of the runner casing 3.

15 is the same as that of the hydroelectric generator 100 shown in FIG.

According to the hydroelectric generator 103 having the above-described structure, the structure is an electromagnetic synchronous generator instead of a permanent magnet type. Therefore, the permanent generator is more expensive than a component that realizes an electromagnet including the field coil 14. There is no need to use a magnet. Furthermore, it becomes possible to cope with an arbitrary power generation capacity by adjusting the field, and it is not necessary to design / manufacture a hydroelectric power generation apparatus corresponding to each power generation capacity. The upstream fixed boss 4a, the rotating boss 4b, and the downstream fixed boss 4c are provided with various coils (power transmission coil 11, power reception coil 12, electromagnet field 14, armature 15) as heat sources. Yes. For this reason, the water guide pipes (41, 42, 40) penetrating through the bosses (4a, 4b, 4c) are arranged coaxially, so that the bosses (4a, 4b, 4c) collect around the axial center. Heat can be efficiently cooled.

As a modification of the hydroelectric generator 103 shown in FIG. 15, at least one of a water intake (50) as shown in FIG. 5 and a water supply groove (60, 62) as shown in FIGS. By providing, the inflow amount of water from the outer peripheral side of the rotating boss 4b in the runner casing 3 to the water conduit 40 of the fixed boss 4c can be further increased. Thereby, the cooling performance of the hydroelectric generator 103 can be further improved.

Further, as a modification of the hydroelectric generator 103 shown in FIG. 15, a drain outlet (70) as shown in FIG. 13 may be provided. Thereby, the disturbance of the water flow which hits the runner 5 can be suppressed, and a simple and low-cost cooling mechanism can be realized without impairing the power generation characteristics of the hydroelectric generator 103 shown in FIG. *

From the above description, many modifications and other embodiments of the present invention are apparent to persons skilled in the art. Accordingly, the foregoing description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. The details of the structure and / or function may be substantially changed without departing from the spirit of the invention.

The present invention is useful for a hydroelectric power generator that is used in a water channel.

WT1... Upstream water channel WT2... Downstream water channel 1. Armature 7a ... Armature coil 7b ... Armature core 80 ... Permanent magnet field 8, 8a, 8b ... Permanent magnet 9 ... Laminated electrical steel sheet 10 ... Field regulator 100, 101, 102, 103 ... Hydroelectric generator 11 ... Power transmission coil 12 ... Power reception coil 13 ... Rectifier 14 ... Electromagnet field 15 ... Armature 30a, 30b ... Water-lubricated bearings 40, 41, 42 ... Water guide pipe 50 ... Water intake 60, 62 ... Water supply groove 90 ... ... Outer peripheral edge

Claims (12)

In a hydroelectric power generation device that is used in a waterway,
An upstream pipe and a downstream pipe attached to the water channel;
A runner casing sandwiched between the upstream pipe and the downstream pipe;
A boss arranged in the axial direction of the runner casing;
A runner accommodated in the runner casing so as to be rotatable around an axis of the runner casing;
With
The boss is divided into a rotating boss and at least one fixed boss;
The rotating boss is fitted to the runner;
The at least one fixed boss is fixedly arranged at a predetermined interval in the axial direction of the runner casing with respect to the rotating boss,
An armature is installed on the at least one fixed boss,
The rotating boss is provided with a permanent magnet field or an electromagnet field so as to face the armature of the at least one fixed boss,
The hydroelectric generator is provided with a water guide pipe penetrating in the axial direction in the at least one fixed boss. A guide vane fixed to the inner wall of the upstream pipe;
The boss is divided along the axial direction of the runner casing into two unit fixed bosses fixed to the upstream pipe and the downstream pipe and one unit rotary boss fitted to the runner. ,
The permanent magnet field is installed on the rotating boss of the one unit,
The armature and the water conduit are installed on one of the two unit fixed bosses,
One fixed boss having the water conduit among the fixed bosses of the two units is fixed to the inner wall of the downstream pipe,
2. The hydroelectric power generation according to claim 1, wherein the other fixed boss of the two units that does not have the water conduit is fixed to the surface of the guide vane on the axial center side of the upstream pipe. apparatus. A water intake for guiding the water flow on the outer peripheral side of the rotating boss in the runner casing to the water conduit of the one fixed boss;
The water intake port has a diameter of an upstream end surface of the one fixed boss longer than a diameter of a downstream end surface of the rotating boss, and an upstream peripheral edge of the upstream end surface of the one fixed boss upstream. The hydroelectric generator according to claim 2, wherein the hydroelectric generator is formed by curving to the side. A water supply groove is formed on the upstream end face of the one fixed boss having the water conduit from the outer peripheral edge of the upstream end face to the inlet of the water conduit through the armature. The hydroelectric power generation device according to claim 2 or 3. All of the two units of the fixed boss and the rotating boss have the water conduit.
The water guide pipes of both the fixed bosses of the two units and the water guide pipes of the rotating bosses are arranged so as to be coaxial with each other in the axial direction of the runner casing. Hydroelectric generator. 6. The hydroelectric generator according to claim 5, wherein a diameter of the water conduit of the fixed boss of the two units is longer than a diameter of the water conduit of the rotating boss. A guide vane fixed to the inner wall of the upstream pipe;
The boss is divided along the axial direction of the runner casing into one unit fixed boss fixed to the upstream pipe and one unit rotating boss fitted to the runner.
The permanent magnet field is installed on the rotating boss of the one unit,
The armature and the water conduit are installed on the fixed boss of the one unit,
2. The hydroelectric generator according to claim 1, wherein the one unit fixed boss is fixed to a surface of the guide vane on an axial center side of the upstream pipe. The one-unit fixed boss and the one-unit rotating boss all have the water conduit.
The hydroelectric generator according to claim 7, wherein the one-unit fixed boss conduit and the one-unit rotating boss conduit are arranged coaxially in the axial direction of the runner casing. The hydroelectric generator according to claim 8, wherein a diameter of the water conduit of the fixed boss of the one unit is longer than a diameter of the water conduit of the rotating boss. A drain outlet for guiding the water flow discharged from the water conduit of the fixed boss of the one unit to the runner on the outer peripheral side of the rotating boss;
The drain port is formed by curving the outer peripheral edge portion of the downstream end face of the fixed boss of the one unit downstream, and by curving the outer peripheral edge portion of the upstream end face of the rotating boss downstream. The hydroelectric power generator according to any one of claims 7 to 9. The boss is divided along the axial direction of the runner casing into two unit fixed bosses fixed to the upstream pipe and the downstream pipe and one unit rotary boss fitted to the runner. ,
The permanent magnet field is installed on the rotating boss of the one unit,
The armatures are installed on both fixed bosses of the two units,
Both the fixed bosses of the two units and the rotating boss have water conduits penetrating in the axial direction,
2. The hydroelectric generator according to claim 1, wherein the conduits of both of the two unit fixed bosses and the conduits of the rotary boss are arranged so as to be coaxial in the axial direction of the runner casing. The boss is divided along the axial direction of the runner casing into two unit fixed bosses fixed to the upstream pipe and the downstream pipe and one unit rotary boss fitted to the runner. ,
One fixed boss of the two unit fixed bosses is provided with a field regulator and a power transmission coil for transmitting AC power output from the field regulator,
The rotating boss of one unit includes a power receiving coil disposed opposite to the power transmitting coil, a rectifier that rectifies AC power received by the power receiving coil, and an electromagnetic field that is excited by DC power output from the rectifier. With magnets,
Of the two unit fixed bosses, the other fixed boss is provided with an armature so as to be opposed to the electromagnet field,
Both the fixed bosses of the two units and the rotating boss have water conduits penetrating in the axial direction,
2. The hydroelectric generator according to claim 1, wherein the conduits of both of the two unit fixed bosses and the conduits of the rotary boss are arranged so as to be coaxial in the axial direction of the runner casing.

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