JP5150751B2 - Fluid power generator - Google Patents

Description

  The present invention relates to a hydrodynamic power generation apparatus, and more particularly to a hydrodynamic power generation apparatus that can suppress loss of shaft power due to one propeller serving as a brake for the other propeller and improve power generation efficiency.

  2. Description of the Related Art Conventionally, fluid power generation apparatuses that use energy such as ocean currents, tidal currents, and rivers, wind power, and the like for power generation are known. One type of fluid power generation device is a propeller type power generation device that allows fluid to flow in the axial direction of the propeller. The propeller type power generation device has a larger rotational reaction force as the number of rotations of the propeller increases. Since the main body that supports the propeller needs to be strong enough to resist the rotational reaction force, the main body must be robust, and the structure of the main body is complicated and the mass is increased. Further, as the rotation speed of the propeller increases, the wind noise of the propeller increases.

  In order to solve the problem, for example, a first propeller disposed on the upstream side of the fluid flow, and a second propeller disposed on the downstream side of the first propeller and rotated in the direction opposite to the rotation direction of the first propeller. There has been disclosed a hydrodynamic power generation apparatus including a propeller and a generator that converts shaft power generated by a first propeller and a second propeller into electric power (Patent Document 1). In the technique disclosed in Patent Document 1, since the first propeller and the second propeller rotate in reverse, the rotational reaction forces generated in the first propeller and the second propeller are offset and suppressed. Thereby, the structure of the main body can be simplified. Furthermore, wind noise can also be suppressed by the first propeller and the second propeller rotating in the opposite directions.

  Patent Document 1 discloses a technique for improving the efficiency of connecting the first propeller and the second propeller with a reverse coupling device using a bevel gear and converting the shaft power generated by the first propeller and the second propeller into electric power. Yes.

JP-A-2005-194918 Special table 2003-505647 gazette

  However, in the technique disclosed in Patent Document 1, the efficiency is improved when the flow velocity of the fluid is an ideal condition for both the first propeller and the second propeller, but either the first propeller or the second propeller is used. In the case of inappropriate conditions, the efficiency of power generation is rather reduced. That is, when the flow rate is not suitable for one propeller, the rotational speed of the one propeller is reduced. One propeller whose rotational speed has decreased is forcibly rotated by the shaft power of the other propeller via the reverse coupling device. However, since the rotational propulsion force by the fluid of one propeller is small, one propeller serves as a brake for the other propeller. Furthermore, since the number of rotations of the other propeller with one propeller acting as a brake decreases, the rotational propulsion force of the other propeller also decreases. This also stalls the other propeller. As described above, one propeller serves as a brake for the other propeller, causing a loss in shaft power.

  Since fluids such as tidal currents and winds have a characteristic that the flow velocity fluctuates, the time that is an ideal condition for both the first propeller and the second propeller does not last long. In addition, the fluid flow changes due to the rotation of the upstream first propeller, and the fluid conditions for the second propeller change. As a result, there is a problem that shaft power loss occurs, and in the long term, the power generation efficiency does not reach the design. This problem is also pointed out in paragraphs 0007 to 0010 of Patent Document 2.

  The present invention has been made to solve the above-described problems, and provides a hydrodynamic power generation apparatus that can suppress loss of shaft power due to one propeller serving as a brake for the other propeller and improve power generation efficiency. The purpose is to do.

Means for Solving the Problems and Effects of the Invention

  In order to achieve this object, according to the hydrodynamic power generation apparatus of the first aspect, the first propeller is disposed at one end of the main body disposed so that the fluid flow direction and the axial direction coincide with each other. A second propeller that is rotated in a direction opposite to the rotation direction is disposed at the other end of the main body. A second rotating shaft and a first rotating shaft are connected to the second propeller and the first propeller, respectively. The power of the first rotating shaft is transmitted to the first element of the differential device by the first one-way clutch, and the power of the second rotating shaft is transmitted to the second element of the differential device by the second one-way clutch. Then, the third element engaged with the second element and the first element is rotated. The rotational energy of the first propeller and the second propeller is converted into electric power by a generator.

  Here, when the rotation speed of the first propeller is reduced and the rotation speed of the first rotating shaft is relatively smaller than the rotation speed of the first element, the first one-way clutch causes the first rotation from the first element. Transmission of power to the shaft is interrupted. Therefore, it is possible to prevent the first propeller having a low rotational speed from becoming a brake for the second propeller having a high rotational speed.

Further, when the rotation speed of the second propeller is reduced and the rotation speed of the second rotation shaft is relatively smaller than the rotation speed of the second element, the second one-way clutch causes the second rotation shaft to move from the second element. Transmission of power to is interrupted. Therefore, it is possible to prevent the second propeller having a small rotational speed from becoming a brake for the first propeller having a large rotational speed. Thereby, the loss of shaft power by one propeller becoming a brake of the other propeller can be controlled. As a result, there is an effect that the power generation efficiency by the rotational energy of the first propeller and the second propeller can be improved.
Moreover, since the 1st element and 2nd element comprised by a pair of worm wheel, and the 3rd element comprised by a worm | warm engage, there exists an effect which can suppress the noise accompanying a rotational drive.

  According to the fluid power generation device of claim 2, the power generation is arranged outside the main body by the output shaft having one end connected to the third element and the other end extending in the direction perpendicular to the axis of the main body. Shaft power is transmitted to the machine. A rotor connected to the other end of the output shaft is rotated integrally with the output shaft, and electric power is generated between the rotor and a stator disposed at a predetermined interval.

  By providing the generator outside the main body as described above, it is possible to omit installing the generator in the main body. Since the main body needs to be provided at a position where the fluid passes in the axial direction (for example, at a high place or underwater), it is difficult to maintain and inspect the generator when the main body is provided with the generator. On the other hand, by providing a generator outside the main body, the generator can be provided regardless of the position where the fluid passes (for example, in a low place or on the water). This has the effect of improving the performance.

  In addition, when converting the shaft power of the first propeller and the second propeller into electric power separately, the first propeller and the second propeller rotate in opposite directions and have different rotational speeds. The power that is generated has a different frequency. For this reason, an auxiliary device such as a frequency converter is required. On the other hand, the rotation direction of the first element that rotates in the opposite direction and the third element that engages with the second element is always one direction. Since the shaft power of the output shaft connected to the third element is converted into electric power, an auxiliary device such as a frequency adjusting device can be omitted, and in addition to the effect of claim 1, the device can be simplified. .

According to the hydrodynamic power generation device of the third aspect , the worm wheel is provided with a pair of disks facing each other with the worm interposed therebetween, and projecting from the opposed surfaces of the pair of disks toward the worm side and at the center of the projecting And a spherical roller pin configured to be rotatable. Since the roller pin is engaged with a worm groove formed in a spiral shape along the outer peripheral surface of the worm, loss due to sliding friction can be reduced, and transmission efficiency can be improved. Since the loss in the differential device is reduced, the power generation efficiency can be further improved in addition to the effect of the first or second aspect .

Moreover, since the worm groove is formed in an arc shape in cross section, the backlash with the spherical roller pin engaged with the worm groove can be reduced. Thereby, the vibration and noise which generate | occur | produce in a differential gear can be suppressed, and in addition to the effect of Claim 1 or 2 , there exists an effect which can further reduce the noise accompanying a rotational drive.

(A) is a side view of the hydrodynamic power generator in the first embodiment, and (b) is a skeleton diagram schematically showing a power transmission mechanism of the hydrodynamic power generator. It is an axial sectional view of a power transmission device. (A) is sectional drawing of the differential apparatus in the IIIa-IIIa line | wire of FIG. 2, (b) is sectional drawing of the differential apparatus in the IIIb-IIIb line | wire of FIG. 3 (a). (A) is a skeleton diagram schematically showing the power transmission mechanism of the hydrodynamic power generation device in the second embodiment, and (b) is a schematic diagram of the power transmission mechanism of the hydrodynamic power generation device in the third embodiment. FIG. It is a side view of the fluid power generator in a 4th embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1A is a side view of the hydrodynamic power generation apparatus 1 in the first embodiment. In the first embodiment, the hydroelectric power generator 1 is configured as a wind power generator. In the hydroelectric power generation device 1, a support column 3 is installed on a base 2 embedded in the ground, and a main body (nacelle) 4 is disposed above the support column 3 approximately horizontally via a yaw driving device 3a. By arranging the main body 4 on the upper portion of the support column 3, wind force can be effectively received. Further, since the yaw driving device 3a is configured to be rotatable in the horizontal direction, the yaw driving device 3a can change the direction of the main body 4 with respect to fluctuations in the wind direction.

  The first propeller 5 and the second propeller 6 are members for converting wind force into rotational power, and are disposed at one end and the other end of the main body 4. The hub 5 a receives the wind force and the hub 5 a. , 6a to rotate the blades 5b, 6b. The first propeller 5 and the second propeller 6 are upstream (or downstream) when the main body 4 is oriented so that the first propeller 5 is located on the windward (upstream) side and the second propeller 6 is located on the leeward (downstream) side. The first propeller 5 and the second propeller 6 are designed so that the rotation directions are opposite to each other.

  Next, with reference to FIG.1 (b), the power transmission mechanism of the fluid power generator 1 is demonstrated. FIG. 1B is a skeleton diagram schematically showing the power transmission mechanism of the hydroelectric power generator 1. Note that the right-pointing arrow shown in FIG. 1B is the direction of the wind. As shown in FIG. 1B, the hub 5a of the first propeller 5 is connected to the first rotating shaft 7, and the hub 6a of the second propeller 6 is connected to the second rotating shaft 8, and the first rotating shaft 7 and The second rotating shaft 8 is connected to the power transmission device 10. The power transmission device 10 is a device for switching the power of the first rotating shaft 7 and the second rotating shaft 8, and includes a first one-way clutch 20, a second one-way clutch 30, and a differential device 40, and a main body. 4 is installed internally.

  The first one-way clutch 20 is a device for transmitting the power of the first rotating shaft 7 to the differential device 40, and for interrupting the transmission of power from the differential device 40 to the first rotating shaft 7. An annular first rotating member 21 disposed at a predetermined interval on the outer periphery of the shaft 7, and a circumferential direction between the outer peripheral surface of the first rotating shaft 7 and the inner peripheral surface of the first rotating member 21. A plurality of first sprags 22 are provided. When the first sprag 22 is engaged with the first rotating shaft 7 and the first rotating member 21, power is transmitted, and the engagement between the first rotating shaft 7 and the first rotating member 21 and the first sprag 22 is released. This interrupts the transmission of power.

  The second one-way clutch 30 is a device for transmitting the power of the second rotary shaft 8 to the differential device 40, while blocking the transmission of power from the differential device 40 to the second rotary shaft 8, and the second rotation. An annular second rotating member 31 disposed on the outer periphery of the shaft 8 at a predetermined interval, and in a circumferential direction between the outer peripheral surface of the second rotating shaft 8 and the inner peripheral surface of the second rotating member 31. And a plurality of second sprags 32 disposed therein. The second sprag 32 is engaged with the second rotary shaft 8 and the second rotary member 31 to transmit power, and the engagement between the second rotary shaft 8 and the second rotary member 31 and the second sprag 32 is released. This interrupts the transmission of power.

  The differential device 40 is a device for inverting and connecting the first rotating shaft 7 and the second rotating shaft 8. The differential device 40 includes a first element 41 to which power of the first rotating shaft 7 is input and the second rotating shaft 8. A second element 44 to which power is input and a third element 47 that is engaged with and rotated by the second element 44 and the first element 41 are provided. The first element 41 is configured to be rotatable integrally with the first rotating member 21, and the second element 44 is configured to be rotatable integrally with the second rotating member 31. The third element 47 is connected to one end of the output shaft 9. The output shaft 9 is a member for outputting rotational power in the direction perpendicular to the axis of the main body 4, and the other end is extended to the generator 50.

  The generator 50 is a device for converting the shaft power of the output shaft 9 into electric power. The rotor 51 is rotated integrally with the output shaft 9, and the electric power is provided at a predetermined interval from the rotor 51. And a stator 52 for generating The rotor 51 includes a permanent magnet or an electromagnet, and the stator 52 includes a coil. In the present embodiment, the generator 50 (alternator) is disposed outside the main body 4. Since the generator 50 is disposed outside the main body 4, the generator 50 can be provided at a low place (ground) of the column 3 close to the base 2 (see FIG. 1A). Thereby, the maintenance and inspection of the generator 50 can be facilitated, and the maintainability of the generator 50 can be improved.

  Further, when the shaft powers of the first propeller 5 and the second propeller 6 are separately converted into electric power, the first propeller 5 and the second propeller 6 rotate in opposite directions and have different rotational speeds. The electric power obtained by the second propeller 6 has a different frequency. For this reason, an auxiliary device such as a frequency converter is required. On the other hand, according to the hydrodynamic power generation device 1, the rotation direction of the first element 41 and the third element 47 that engage with the second element 44 rotating in opposite directions can always be one direction. By converting the shaft power of the output shaft 9 connected to the third element 47 into electric power, an auxiliary device such as a frequency adjusting device can be omitted, and the device can be simplified. It is also possible to provide a speed increaser that increases the speed of the output shaft 9.

  Moreover, since the generator is not installed in the main body 4, the main body 4 can be reduced in weight. When constructing the hydroelectric power generation device 1, it is necessary to lift the main body 4 above the support post 3 after the support column 3 is erected, but the main body 4 can be reduced in weight, so the hydrodynamic power generation device 1 is constructed. Work can be facilitated.

  Moreover, the 1st propeller 5 and the 2nd propeller 6 which rotate with a wind force are low rotation (It is about 10-50 rotations / min. Depending on a model and magnitude | size). Even if the speed is increased by a speed increaser (not shown), the generator 50 having a low rotation speed and a high torque is suitable. However, in general, the low-rotation / high-torque generator 50 has a problem that it is heavy. According to the hydrodynamic power generation device 1, since it is not necessary to install a generator in the main body 4, the optimum generator 50 can be selected without considering the weight of the generator 50. Therefore, the low-rotation / high-torque generator 50 can be provided in a low place (ground), and the output of power generation can be increased.

  As described above, in the power transmission device 1, the first rotary shaft 7 and the differential device 40 are connected by the first one-way clutch 20, and the second rotary shaft 8 and the differential device 40 are connected by the first one. 2 are connected by a one-way clutch 30. Thereby, the power of the first rotating shaft 7 is transmitted to the first element 41 of the differential device 40 by the first one-way clutch 20, and the power of the second rotating shaft 8 is transmitted to the first power of the differential device 40 by the second one-way clutch 30. 2 is transmitted to the element 44. Then, the third element 47 engaged with the second element 44 and the first element 41 is rotated, and the output shaft 9 is rotated, so that the rotational energy of the first propeller 5 and the second propeller 6 is generated by the generator 50. Converted to electric power.

  On the other hand, when the rotation speed of the first propeller 5 is reduced and the rotation speed of the first rotating shaft 7 is relatively smaller than the rotation speed of the first element 41, the first one-way clutch 20 causes the first element 41 to move. Transmission of power to the first rotating shaft 7 is interrupted. Therefore, it is possible to prevent the first propeller 5 having a small rotational speed from becoming a brake for the second propeller 6 having a large rotational speed.

  In addition, when the rotation speed of the second propeller 6 is reduced and the rotation speed of the second rotating shaft 8 is relatively smaller than the rotation speed of the second element 44, the second one-way clutch 30 causes the second element 44 to rotate. Transmission of power to the second rotary shaft 8 is interrupted. Therefore, it is possible to prevent the second propeller 6 having a low rotation speed from becoming a brake for the first propeller 5 having a high rotation speed. Thereby, the loss of shaft power by one side of the 1st propeller 5 or the 2nd propeller 6 becoming the other brake of the 1st propeller 5 or the 2nd propeller 6 can be controlled. As a result, the power generation efficiency by the rotational energy of the first propeller 5 and the second propeller 6 can be improved.

  Furthermore, since the 1st propeller 5 and the 2nd propeller 6 mutually reversely rotate, the rotational reaction force which arises in the 1st propeller 5 and the 2nd propeller 6 is canceled and suppressed. Thereby, the structure of the main body 4 can be simplified. Wind noise generated in the first propeller 5 and the second propeller 6 can be suppressed by rotating the first propeller 5 and the second propeller 6 in the reverse directions.

  Next, the structure of the power transmission device 10 installed in the main body 4 will be described with reference to FIG. FIG. 2 is an axial sectional view of the power transmission device 10. As shown in FIG. 2, the first rotating shaft 7 and the second rotating shaft 8 are positioned on the same axis O, and are pivotally supported by bearings 61 and 62 disposed and fixed on the housing 10 a of the power transmission device 10. Is done. The first rotating shaft 7 is loosely inserted at its end into a recess formed on the end surface of the second rotating shaft 8. A bearing 63 is disposed between the outer peripheral surface of the first rotating shaft 7 and the inner peripheral surface of the second rotating shaft 8, and the bearing 64 is between the contact surfaces of the first rotating shaft 7 and the second rotating shaft 7. It is arranged. Thereby, the 1st rotating shaft 7 and the 2nd rotating shaft 8 are each rotatably supported by the housing | casing 10a.

  The first element 41 and the second element 44 are members for transmitting the power of the first rotating shaft 7 and the second rotating shaft 8 to the third element 47. In the present embodiment, the worm wheels 41 and 44 It is configured. The worm wheels 41, 44 include a pair of disks 42, 45 that face each other with the output shaft 9 interposed therebetween, and roller pins 43, 46 that project from the opposing surfaces of the disks 42, 45 toward the output shaft 9 side. Yes.

  The discs 42 and 45 are members formed in an annular shape, and have holes 42 a and 45 a through which the first rotating shaft 7 or the second rotating shaft 8 passes. A bearing 65 is disposed between the inner peripheral surface of the hole 42 a and the outer peripheral surface of the first rotary shaft 7, and the bearing 66 is provided between the inner peripheral surface of the hole 45 a and the outer peripheral surface of the second rotary shaft 8. It is arranged. Further, bearings 67 and 68 are disposed between the disks 42 and 45 and the inner surface of the housing 10a. Thereby, the disks 42 and 45 are supported so as to be rotatable relative to the first rotating shaft 7 and the second rotating shaft 8. Moreover, since the 1st rotating shaft 7 and the 2nd rotating shaft 8 have penetrated the hole parts 42a and 45a of the disks 42 and 45, the axial direction length of the power transmission device 10 can be made small.

  The first rotating member 21 and the second rotating member 31 are annular members for engaging the first sprag 22 and the second sprag 32 between the first rotating shaft 7 and the second rotating shaft 8, It is formed integrally with the disks 42 and 45, and projects from the opposing surfaces of the disks 42 and 45 toward the output shaft 9 side. The first rotating member 21 and the second rotating member 31 are located on the inner side in the axis-perpendicular direction (axial center O side) with respect to the roller pins 43 and 46. Since the first rotating member 21 and the second rotating member 31 are formed integrally with the disks 42 and 45, the power transmission device 10 can be made compact.

  The third element 47 is a member that engages with the first element 41 and the second element 44 to reversely connect the first element 41 and the second element 44. In the present embodiment, the worm 47 is formed at the tip of the output shaft 9. The output shaft 9 is orthogonal to the first rotating shaft 7 and the second rotating shaft 8 when viewed from the side, and is supported by the housing 10 a by a bearing 69. The worm 47 (third element) is rotated by the rotation of the worm wheels 41 and 44 (first element and second element), and the output shaft 9 is rotated. Since the sliding friction is dominant in the engagement between the worm wheels 41 and 44 and the worm 47, noise accompanying the rotational drive of the worm 47 can be suppressed.

  Further, the number of teeth of the worm wheels 41 and 44 (the number of roller pins 43 and 46) is set larger than the number of teeth of the worm 47. Thus, when the worm wheels 41 and 44 are driven to rotate, the worm 47 is rotated at an increased speed. By rotating the worm 47 at a higher speed, the rotation speed of the output shaft 9, that is, the rotation speed of the rotor 51 can be increased. Thereby, the output of the generator 50 can be increased.

  The worm gears (worm wheels 41 and 44 and worm 47) are generally used so that the worm wheels 41 and 44 are rotated (driven) by the rotation of the worm 47. The worm 47 can be rotated (reverse drive) by the rotation. Specifically, the twist angle of the worm 47 may be set to be larger than the friction angle.

  Next, the differential device 40 including the worm wheels 41 and 44 and the worm 47 will be described in detail with reference to FIG. 3A is a cross-sectional view of the differential device 40 taken along line IIIa-IIIa in FIG. 2, and FIG. 3B is a cross-sectional view of the differential device 40 taken along line IIIb-IIIb in FIG. .

  In FIG. 3A, for the sake of easy understanding, the illustration of the first rotating shaft 7 and the second rotating shaft 8 penetrating through the hole 42a and the center thereof and the illustration of the worm wheel 44 are omitted. . Further, in FIG. 3B, a part of the output shaft 9 on the worm wheel 44 side and the worm wheel 44 are not shown.

  As shown in FIG. 3A, the roller pin 43 is positioned on a concentric circle having a diameter larger than that of the inner periphery of the hole 42a and the inner periphery of the first rotating member 22 (the center is the axis O) and protrudes from the disk 42. And is engaged with a worm groove 47 a formed in a spiral shape along the outer peripheral surface of the worm 47.

  As shown in FIG. 3B, the roller pin 43 includes a shaft member 43a and a roller portion 43c configured to be rotatable around the shaft member 43a. The disc 42 has a through hole 42b formed concentrically therethrough, and a shaft member 43a is fitted into the through hole 42b from the facing surface 42c side of the disc 42. Since the shaft member 43a has a flange 43b protruding from the outer periphery of the substantially center in the longitudinal direction, the insertion depth of the shaft member 43a is regulated by the flange 43b. The shaft member 43a fitted in the through hole 42b is fixed from the opposite surface side of the disk 42 by a fastening member having a diameter larger than the inner diameter of the through hole 42b. As a result, the shaft member 43 a is fixed to the disk 42 and protrudes from the facing surface 42 c of the disk 42.

  The roller portion 43c is a member that is pivotally supported by the shaft member 43a by a bearing 43d, and has an outer peripheral surface that is spherical. The roller portion 43c rotates around the shaft member 43a. Since the roller portion 43c is mounted on the shaft member 43a, the shaft member 43a and the roller portion 43c can be easily replaced even in the unlikely event of breakage or the like, and the maintainability is excellent.

  The worm groove 47a is a portion with which the roller portion 43c is engaged, and is formed in an arc shape in cross section. In the present embodiment, the worm groove 47a is formed in a Gothic arc shape (a shape in which two arcs having the same radius and different centers are connected).

  Thereby, since the roller pin 43 (roller portion 43c) having a spherical tip is engaged with the worm groove 47a formed in a spiral shape along the outer peripheral surface of the worm 47, loss due to sliding friction can be reduced. , Can improve the transmission efficiency. Since the loss in the differential device 40 can be reduced, the power generation efficiency can be further improved. Further, heat generation due to friction can be reduced, and the speed transmission ratio can be further increased by reducing friction.

  Further, since the worm groove 47a is formed in an arc shape in cross section, the backlash with the spherical roller pin 43 engaged with the worm groove 47a can be reduced. Thereby, the vibration and noise which generate | occur | produce in the differential apparatus 40 can be suppressed, and the noise accompanying a rotational drive can be made still smaller. Particularly, since the cross section of the worm groove 47a is formed in a Gothic arc shape, the worm wheel 41, 44 and the worm 47 can be easily adjusted in position, and the worm 47 can be rotated with a smaller force.

  Next, with reference to FIG. 4A and FIG. 4B, the second embodiment and the third embodiment will be described. In the first embodiment, the case where the generator 50 is disposed outside the main body 4 has been described. On the other hand, 2nd Embodiment and 3rd Embodiment demonstrate the case where the generator (rotor 51a, 51b and stator 52a, 52b) is installed in the main body 4. FIG. In the second embodiment and the third embodiment, the power transmission devices 110 and 210 are described as being installed in the main body 4 (see FIG. 1A), and are the same as those in the first embodiment. About the part, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. First, a second embodiment will be described with reference to FIG. FIG. 4A is a skeleton diagram schematically showing a power transmission mechanism of the hydrodynamic power generation apparatus 101 in the second embodiment.

  In the hydrodynamic power generation device 101, rotors 51 a and 51 b and stators 52 a and 52 b are installed in the power transmission device 110. The rotors 51a and 51b are disposed at two locations on the first propeller 5 side and the second propeller 6 side, and the first rotating member 21 and the first element 41, the second rotating member 31 and the second element 44, respectively. It is comprised so that it may rotate integrally. The stators 52a and 52b are arranged at predetermined intervals from the respective rotors 51a and 51b. Since the rotation speed of the third element 47 is detected by the encoder 70, the operation of the differential device 40 can be detected.

  According to the fluid power generation device 101 configured as described above, power can be generated by the two rotors 51a and 51b and the stators 52a and 52b on the first propeller 5 side and the second propeller 6 side. When the number of rotations of one propeller (here, the first propeller 5 is assumed for convenience of description) is reduced and the number of rotations of the first rotating shaft 7 is relatively smaller than the number of rotations of the first element 41 First, the transmission of power from the first element 41 to the first rotating shaft 7 is interrupted by the first one-way clutch 20. Therefore, it is possible to prevent the first propeller 5 having a small rotational speed from becoming a brake for the second propeller 6 having a large rotational speed. Even in this case, since the rotor 51a is rotated by the first element 41, power generation by the two rotors 51a and 51b and the stators 52a and 52b is continuously performed. This prevents the power generation efficiency from being lowered.

  Next, a third embodiment will be described with reference to FIG. FIG. 4B is a skeleton diagram schematically showing the power transmission mechanism of the hydrodynamic power generation apparatus 201 in the third embodiment. The hydroelectric power generation device 201 includes a first one-way clutch 220, a second one-way clutch 230, and a differential device 40. Rotors 51a and 51b and stators 52a and 52b are installed in the power transmission device 210. Yes.

  The first one-way clutch 220 is an annular first rotating member 221 that rotates integrally with the first rotating shaft 7, and is disposed on the inner side of the first rotating member 221 coaxially with the first rotating shaft 7. The first transmission shaft 222 rotated integrally with the element 41, and a plurality of first sprags disposed in the circumferential direction between the outer peripheral surface of the first transmission shaft 222 and the inner peripheral surface of the first rotation member 221 223. The first sprag 223 is engaged with the first rotating member 221 and the first transmission shaft 222 to transmit power, and the engagement between the first rotating member 221 and the first transmission shaft 222 and the first sprag 223 is released. This interrupts the transmission of power.

  The second one-way clutch 230 is an annular second rotating member 321 that rotates integrally with the second rotating shaft 8, and is disposed coaxially with the second rotating shaft 8 inside the second rotating member 321. The second transmission shaft 322 rotated integrally with the element 44, and a plurality of second sprags disposed in the circumferential direction between the outer peripheral surface of the second transmission shaft 322 and the inner peripheral surface of the second rotation member 321 323. The second sprag 323 is engaged with the second rotating member 321 and the second transmission shaft 322 to transmit power, and the engagement between the second rotating member 321 and the second transmission shaft 322 and the second sprag 323 is released. This interrupts the transmission of power.

  The rotors 51a and 51b are disposed at two locations on the first propeller 5 side and the second propeller 6 side, and are configured to rotate integrally with the first rotating member 221 and the second rotating member 321, respectively. Yes. The stators 52a and 52b are arranged at predetermined intervals from the respective rotors 51a and 51b.

  According to the hydrodynamic power generation apparatus 201 configured as described above, power can be generated by the two rotors 51a and 51b and the stators 52a and 52b on the first propeller 5 side and the second propeller 6 side. When the number of rotations of one propeller (here, the first propeller 5 is assumed for convenience of description) is reduced and the number of rotations of the first rotating shaft 7 is relatively smaller than the number of rotations of the first element 41 The transmission of power from the first element 41 to the first rotating shaft 7 is blocked by the first one-way clutch 220. Therefore, it is possible to prevent the first propeller 5 having a small rotational speed from becoming a brake for the second propeller 6 having a large rotational speed. Even in this case, since the rotor 51a is rotated by the first rotating shaft 7 and the first rotating member 221, power generation by the two rotors 51a and 51b and the stators 52a and 52b is continuously performed. . This prevents the power generation efficiency from being lowered.

  In the second embodiment and the third embodiment, the first propeller 5 and the second propeller 6 rotate in opposite directions and have different rotational speeds, so that the first propeller 5 side and the second propeller 6 side 2 An auxiliary device such as a frequency adjusting device for adjusting the frequency of the electric power generated by the rotors 51a and 51b and the stators 52a and 52b is required. Further, a speed increaser (not shown) can be provided on the first rotating shaft 7 and the second rotating shaft 8 to increase the number of rotations of the rotors 51a and 51b.

  Next, a fourth embodiment will be described with reference to FIG. In the first to third embodiments, a case has been described in which the hydroelectric power generators 1, 101, 201 are configured as wind power generators. In contrast, in the fourth embodiment, a hydrodynamic power generation apparatus 301 that uses energy such as ocean currents, tidal currents, and rivers for power generation will be described. FIG. 5 is a side view of a hydrodynamic power generator 301 in the fourth embodiment. In addition, the rightward arrow shown in FIG. 5 is the direction of the water flow.

  The hydroelectric power generator 301 is fixed by a cylindrical tube 302 fixed substantially horizontally below a water surface by a support member (not shown), and a hollow support portion 303 inside the tube 302. And a cylindrical main body 304. The pipe body 302 is open at both ends, and is fixed below the water surface so that the water flow flows in from one opening of the pipe body 302 and flows out from the other opening.

  The first propeller 305 and the second propeller 306 are members for converting the energy of the water flow into rotational power. The first propeller 305 and the second propeller 306 are disposed at one end and the other end of the main body 304 and receive the water flow from the hubs 305a and 306a. Blades 305b and 306b for rotating the hubs 305a and 306a are provided. The first propeller 305 and the second propeller 306 are designed so that the rotation directions of the first propeller 305 and the second propeller 306 are opposite to each other when viewed from the upstream side (or the downstream side).

  The generator 307 is a device for converting shaft power generated by the first propeller 305 and the second propeller 306 into electric power, and is disposed outside the main body 304. Therefore, unlike the position of the main body 304, the generator 307 can be provided on the water, on the ground, or at a shallow depth. As a result, the maintenance and inspection of the generator 307 can be facilitated, and the maintainability of the generator 307 can be improved. Note that the means for transmitting the power generated by the first propeller 305 and the second propeller 306 to the generator 307 through the support portion 303 has an output shaft connected to the third element as in the first embodiment. Since it should just extend, description is abbreviate | omitted.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed. For example, the numerical values (for example, the number and size of each component) given in the above embodiment are merely examples, and other numerical values can naturally be adopted.

  In each of the above embodiments, the case where the first one-way clutches 20 and 220 and the second one-way clutches 30 and 230 are sprag types has been described. However, the present invention is not necessarily limited to this, and other one-way clutches such as roller types, Of course, it is possible to adopt a ratchet type.

  In each of the above-described embodiments, the case where the differential device 40 employing the worm wheels 41 and 44 (first element and second element) and the worm 47 (third element) is described, but the present invention is not necessarily limited thereto. However, it is naturally possible to employ other differential devices. Examples of other differential devices include those equipped with bevel gears, hypoid gears (registered trademark), and the like.

  In each of the above embodiments, the case where the cross-sectional shape of the worm groove 47a formed on the outer peripheral surface of the worm 47 is formed in a Gothic arc shape is not limited to this, but the cross-sectional arc shape is not necessarily limited thereto. Of course, other shapes are possible. Examples of other shapes include a circular arc shape (single arc shape) and the like. Also in this case, by forming the worm groove 47a in an arc shape in cross section, it is possible to realize an effect of reducing the backlash with the spherical roller pins 43 and 46 engaged with the worm groove 47a.

DESCRIPTION OF SYMBOLS 1,101,201,301 Fluid power generator 4,304 Main body 5,305 1st propeller 6,306 2nd propeller 7 1st rotating shaft 8 2nd rotating shaft 9 Output shaft 20,220 1st one-way clutch 30,230 Second one-way clutch 40,140 Differential 41 First element (worm wheel)
42,45 Disc 43,46 Roller pin 44 Second element (worm wheel)
47 Third Element (Warm)
47a Worm groove 50,307 Generator 51 Rotor 52 Stator 141 First element 144 Second element 147 Third element

Claims (3)

A main body disposed so that a fluid flow direction and an axial direction coincide with each other;
A first propeller disposed at one end of the body and rotated by a fluid;
A second propeller that is rotated in a direction opposite to the rotation direction of the first propeller and disposed at the other end of the main body;
A second rotating shaft and a first rotating shaft respectively connected to the second propeller and the first propeller;
A first element to which the power of the first rotating shaft is input; a second element to which the power of the second rotating shaft is input; and a third element that engages and rotates with the second element and the first element. A differential having an element;
A hydrodynamic power generator comprising: a generator that converts rotational energy of the first propeller and the second propeller into electric power;
A first one-way clutch that transmits power of the first rotating shaft driven by the first propeller to the first element, while blocking transmission of power from the first element to the first rotating shaft;
A second one-way clutch that transmits the power of the second rotating shaft driven by the second propeller to the second element, while blocking transmission of power from the second element to the second rotating shaft ;
The hydrodynamic power generator according to claim 1, wherein the first element and the second element are configured by a pair of worm wheels, and the third element is configured by a worm that can be engaged with the worm wheel . An output shaft having one end connected to the third element and the other end extending in a direction perpendicular to the axis of the main body;
The generator is disposed outside the main body, and is connected to the other end side of the output shaft and rotated integrally with the output shaft, and a predetermined interval from the rotor. The hydroelectric power generation device according to claim 1, further comprising a stator disposed to be opened. The pair of worm wheels are:
A pair of disks facing each other with the worm interposed therebetween;
A spherical roller pin that is configured to project toward the worm side on the opposing surfaces of the pair of disks and configured to be rotatable around the projecting center,
The worm is
Along an outer peripheral surface formed in a spiral shape with the worm groove the roller pin is engaged, the worm groove fluid power generator according to claim 1 or 2, characterized in that it is formed into an arc-shaped cross section apparatus.

Images