WO2020013019A1 - Structure de support de pale de rotor pour générateur électrique - Google Patents

Structure de support de pale de rotor pour générateur électrique Download PDF

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Publication number
WO2020013019A1
WO2020013019A1 PCT/JP2019/026211 JP2019026211W WO2020013019A1 WO 2020013019 A1 WO2020013019 A1 WO 2020013019A1 JP 2019026211 W JP2019026211 W JP 2019026211W WO 2020013019 A1 WO2020013019 A1 WO 2020013019A1
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WO
WIPO (PCT)
Prior art keywords
generator
rotor
case
support structure
shaft
Prior art date
Application number
PCT/JP2019/026211
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English (en)
Japanese (ja)
Inventor
広平 小野
近藤　博光
Original Assignee
Ntn株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2020013019A1 publication Critical patent/WO2020013019A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D15/00—Transmission of mechanical power
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction

Definitions

  • the present invention relates to a rotor supporting structure for a generator, and to a technique applied to a wind power generator and a hydroelectric generator.
  • Patent Document 1 Since a wind power generator is generally installed in a natural environment and operates basically using irregular wind energy as a power, a relatively large load acts on components of the wind power generator (Patent Document 1, 2).
  • FIG. 5 is a sectional view showing the arrangement and configuration of a generator and the like used in a conventional vertical axis wind turbine.
  • a bending load generated by the wind pressing the wind receiving surface of the blade 50a is generated.
  • the bending load and the generated torque are received by the generator shaft 51a and the bearing 52 of the generator 51, and the diameter of the shaft is increased to cope with this.
  • FIG. 6 shows a structure in which the intermediate shaft 53 is set to reduce the bending load acting on the generator shaft 51a of the generator 51, and the load is not directly received by the generator shaft 51a of the generator 51. In this case, the bending load can be absorbed by the intermediate shaft 53, but the distance between the shafts increases, and the entire device becomes larger.
  • the power generation torque is relatively stable because the moment of inertia of the rotor impedes rapid changes, while the bending load that the wind pushes against the wind receiving surface is extremely shocking. In the calculation, it is necessary to estimate many static effects, and as a result, the shaft diameter must be increased.
  • Patent Document 3 some large wind turbines have an assist mechanism for improving startability (Patent Document 3), but it is difficult to provide an assist mechanism for a small wind turbine from the viewpoint of cost.
  • ⁇ Factors attributable to the startability of a wind turbine without an assist mechanism include friction loss, inertia loss, and viscous loss.
  • friction loss is dominant because the problem before starting movement is a problem.
  • friction loss occurs from an oil seal, a bearing, and the like, it has been technically shown that in both cases, the friction loss largely depends on the shaft diameter. Therefore, suppressing the bending load unnecessary for power generation and reducing the shaft diameter leads to an improvement in startability.
  • An object of the present invention is to provide a rotor supporting structure for a generator that can improve the startability of a power generator and improve power generation efficiency.
  • the rotor support structure for a generator rotatably supports a vertical shaft type rotor, and transmits the rotation of the rotor to a generator or a gearbox located below the rotor.
  • Rotor support structure of A cylindrical bearing case is rotatably mounted on the outer periphery of the case of the generator or the gearbox via a ring-shaped bearing, and the bearing case is coaxially coupled to the rotating blade and the generator Or the input shaft of the gearbox.
  • a cylindrical bearing case is rotatably installed on the outer periphery of the case of the generator or the gearbox via a ring-shaped bearing, and this bearing case is connected to the rotor blades and the power generation of the generator. Connected to the input shaft of the gearbox or gearbox. For this reason, a load other than the rotational force generated when the rotor blades receive wind power or hydraulic power, that is, a bending load acting on the generator shaft or the input shaft of the gearbox, can be received by the bearing case and the bearing. In this case, it becomes possible to increase the section modulus of the structure as compared with receiving a bending load on the shaft, and the bearing only needs to have a small load capacity.
  • the generator shaft or the input shaft of the gearbox is connected to the bearing case and is not directly connected to the rotor, the bending load hardly acts, and therefore, only the torsional load, which is the power generation torque, is applied. This can be taken into consideration, and the shaft diameter can be reduced. As a result, the friction loss of the generator or the gearbox can be reduced, the startability of the power generator can be improved, and the power generation efficiency can be improved.
  • the bearing case may be connected to a generator shaft of the generator or an input shaft of the gearbox via a torque transmission coupling. Even when the generator shaft or the input shaft of the gearbox and the rotor are provided coaxially, a deviation in coaxiality may occur due to an installation error or aging deterioration. In this case, due to the alignment of the torque transmitting coupling, the coaxiality is adjusted to a desired value by absorbing a deviation of the coaxiality due to an installation error between the generator shaft or the input shaft of the gearbox and the rotating blade or deterioration over time. Can be secured. Therefore, the friction loss of the generator or the gearbox can be further reduced, and the startability of the power generator can be improved.
  • the bearing case includes a cylindrical case main body, and an end plate provided at one axial end of the case main body and coupled with the rotating blade, and the end plate is fitted to the case main body with an intaglio. You may. According to this configuration, since the bearing case and the rotor are coaxial, and the rotor is coupled to the end plate of the bearing case, the end plate and the rotor are coaxial. Further, since a cylindrical case body is rotatably installed via bearings on the outer periphery of the case of the generator or the speed-up gear, the input shaft of the generator shaft or the speed-up gear rotatably supported by the case, Desired coaxiality is secured with respect to the axis of the case body.
  • the end plate is fitted to the case body, the coaxiality between the generator shaft or the input shaft of the gearbox and the rotor can be easily secured to a desired value, thereby reducing costs. Can be planned. Therefore, the friction loss of the generator or the gearbox can be further reduced, and the startability of the power generator can be improved.
  • An annular seal member may be provided at a fitting portion between the case body and the end plate. In this case, the sealing property in the bearing case is sufficiently ensured, and the life of the generator or the gearbox can be extended.
  • the bearing case may be provided with one or both of a concave portion and a convex portion for increasing the surface area. In this case, since the surface area of the bearing case increases, heat radiation from the bearing case is promoted.
  • a slit may be provided at a position other than the bearing fitting portion of the bearing case.
  • a fan for heat dissipation may be provided in the generator or the speed increaser. In this case, for example, by rotating the fan in synchronization with the rotation of the generator or the gearbox, heat radiation of the generator or the gearbox can be promoted.
  • FIG. 1 shows an example in which the rotor support structure of the generator is applied to a vertical axis wind turbine type wind power generator.
  • the vertical axis wind turbine type wind turbine includes a rotor 1, a generator 2, and a rotor support 3.
  • the rotor 1 has a plurality of blades 1a extending in the vertical direction and a support 1b.
  • the rotary wing 1 is of a lift type that rotates by the lift received by the blade 1a.
  • a plurality of blades 1a are attached to a rotor support 3 described later via a support 1b extending in the horizontal direction.
  • the number of the blades 1a is, for example, two, and is provided at a position having a phase difference of 180 ° with respect to the rotation axis L.
  • the number of blades 1a may be three or more.
  • the generator 2 is located below the rotor 1.
  • the generator 2 is provided in a bearing case 4 of the rotor support 3.
  • the generator 2 generates electric power by rotating the generator shaft 2 a by the rotation of the rotor 1.
  • the generator 2 is, for example, a three-phase AC generator of a permanent magnet synchronous type, an induction type or the like, or a single-phase AC generator, and includes a case 5, a stator 2b, a rotor 2c, a bearing 6 in the generator, and a generator shaft 2a. Have.
  • the case 5 has a cylindrical shape extending in the up-down direction, and the lower end in the axial direction of the case 5 is supported and attached to the support plate 7.
  • a generator shaft 2a is rotatably supported on the inner peripheral surface of the case 5 via generator inner bearings 6,6.
  • the bearing 6 in the generator is a rolling bearing such as a deep groove ball bearing, an angular ball bearing, and a tapered roller bearing.
  • the stator 2b is fixed to the inner peripheral surface of the case 5, and the rotor 2c is fixed to the outer peripheral surface of the generator shaft 2a.
  • the rotor 2c faces the stator 2b with a predetermined gap therebetween.
  • the generator 2 When the rotor 2c rotates together with the generator shaft 2a, the generator 2 generates power.
  • the power generated by the generator 2 is supplied to an external power system via a wiring (not shown).
  • the rotor support section 3 rotatably supports the rotor 1 and transmits the rotation of the rotor 1 to the generator 2.
  • the rotor support 3 includes a support member 7, a bearing case 4, a bearing 9, a torque transmission coupling 10, and an annular seal member 11.
  • the support member 7 in this example has a support substrate 7a fixed to the upper end member 12a of the tower support 12 by bolts 13 and a fixing member 7b fixed to the upper surface of the support substrate 7a.
  • the support member 7 may be an integral member formed from the same material.
  • the tower support 12 is formed of, for example, a steel tower, and a plate-like upper end member 12a extending in the horizontal direction is provided at the top of the steel tower.
  • Cylindrical bearing cases 4 are rotatably installed at a plurality of upper and lower locations on the outer periphery of a case 5 of the generator 2 via ring-shaped bearings 9, 9.
  • the ring-shaped bearing 9 is a so-called thin-type rolling bearing in which a bearing height obtained by dividing a value obtained by subtracting the inner ring inner diameter from the outer ring inner diameter from the outer ring by 2 is formed thinner than a general bearing.
  • Rolling bearings such as deep groove ball bearings, angular contact ball bearings, and tapered roller bearings.
  • the bearing case 4 is coaxially coupled to the rotor 1 and connected to the generator shaft 2a of the generator 2 via a torque transmitting coupling 10 having an aligning property.
  • the bearing case 4 includes a cylindrical case main body 4a and an end plate 4b fastened to the case main body 4a by bolts 14.
  • the support 1b is fixed to the upper end surface of the end plate 4b via a bracket 15.
  • An annular seal portion 16 is provided on the lower surface of the end plate 4b, and the end plate 4b is fitted to the upper end portion (one axial end portion) of the case body 4a in the axial direction by the seal portion 16.
  • An annular seal member 11 is provided at a fitting portion between the case main body 4a and the end plate 4b.
  • the annular seal member 11 for example, packing or the like is applied.
  • a shaft portion 17 protruding in the axial direction is provided, and the shaft portion 17 is provided coaxially with the generator shaft 2a.
  • the generator shaft 2 a is connected to the shaft portion 17 via the torque transmission coupling 10.
  • the shaft portion 17 is provided coaxially with the generator shaft 2a, a deviation in coaxiality may occur due to an installation error or aging deterioration.
  • the torque transmission coupling 10 absorbs a deviation in coaxiality due to an attachment error between the shaft portion 17 and the generator shaft 2a or deterioration over time. Note that the generator shaft 2a can be directly connected to the shaft portion 17 of the end plate 4b without the torque transmission coupling 10 interposed therebetween.
  • the cylindrical bearing case 4 is rotatably installed on the outer periphery of the case 5 of the generator 2 via the ring-shaped bearings 9, 9. 4 is connected to the rotor 1 and connected to the generator shaft 2a of the generator 2.
  • the bearing case 4 and the bearings 9 and 9 can receive a load other than the rotational force generated when the rotor blade 1 receives the wind, that is, a bending load acting on the generator shaft 2a.
  • the bearing 9 need only have a small load capacity.
  • the generator shaft 2a is connected to the bearing case 4 and is not directly connected to the rotary wing 1, no bending load is applied. Therefore, only the torsional load, which is the generation torque, needs to be considered. The diameter can be reduced. As a result, the friction loss of the generator 2 can be reduced, the startability of the wind turbine generator can be improved, and the power generation efficiency can be improved.
  • the bearing case 4 is connected to the generator shaft 2a via a torque transmission coupling 10. Because of the alignment of the torque transmitting coupling, the coaxiality between the generator shaft 2a and the rotary blade 1 can be maintained at a desired value. Therefore, the friction loss of the generator 2 can be further reduced, and the startability of the wind power generator can be improved. Since the bearing case 4 and the rotor 1 are coaxial, and the rotor 1 is coupled to the end plate 4b of the bearing case 4, the end plate 4b and the rotor 1 are coaxial.
  • the cylindrical case body 4a is rotatably installed on the outer periphery of the case 5 of the generator 2 via the bearing 9, the generator shaft 2a rotatably supported by the case 5 has the axis center of the case body 4a. , A desired coaxiality is secured.
  • the end plate 4b is fitted to the case main body 4a with the intaglio, the coaxiality between the generator shaft 2a and the rotary wing 1 can be easily secured to a desired value, whereby the cost can be reduced. . Therefore, the friction loss of the generator 2 can be further reduced, and the startability of the wind power generator can be improved. Since the annular seal member 11 is provided at the fitting portion between the case main body 4a and the end plate 4b, the sealing property inside the bearing case 4 is sufficiently ensured, and the life of the generator 2 can be extended.
  • the generator 2 may be provided with a fan 18 for heat radiation.
  • the rotating shaft 18a of the fan 18 is connected to the lower end of the generator shaft 2a.
  • wind can be sent from a ventilation hole (not shown) formed in the tower support 12, and heat radiation of the generator 2 can be promoted.
  • FIG. 3A and 3b show an example in which the shape of the bearing case 4 is changed in the first embodiment, and a part (for example, line III-III in FIG. 2) of the case body 4a is cut in a horizontal direction and viewed.
  • FIG. 3A a plurality of recesses 19 that are recessed radially inward from the outer peripheral surface may be formed on the outer peripheral surface of the case main body 4 a of the bearing case 4.
  • the recesses 19 are recesses for increasing the surface area, and are formed, for example, at regular intervals in the circumferential direction and include slits extending in the axial direction.
  • the concave portions 19 and the convex portions 20 may be alternately formed in the circumferential direction on the outer peripheral surface of the case main body 4a.
  • Each projection 20 is formed of a ridge extending in the axial direction.
  • a plurality of convex portions may be formed on the outer peripheral surface of the case main body 4a so as to project a predetermined distance radially outward from the outer peripheral surface.
  • Either one or both of the concave portion and the convex portion may be provided at a portion other than the bearing fitting portion on the inner peripheral surface of the case main body 4a.
  • One or both of the concave portion and the convex portion may be provided in a part of the end plate 4b.
  • One or both of the concave portion and the convex portion may be formed in an annular shape on the peripheral surface of the case main body 4a. According to these configurations, since the surface area of the bearing case 4 increases, heat radiation from the bearing case 4 is promoted.
  • a speed increaser 21 for increasing the rotation of the rotor 1 and transmitting the rotation to the generator 2 is provided like the rotor support structure of the generator according to the second embodiment of the present invention.
  • a cylindrical bearing case 4 may be rotatably mounted on the outer periphery of a case 21 a of the speed change device 21 via ring-shaped bearings 9, 9.
  • the bearing case 4 is coaxially coupled to the rotor 1 and is connected to the input shaft 21b of the gearbox 21.
  • the speed increaser 21 increases the rotation of the input shaft 21b and transmits the rotation to a low-speed shaft (not shown). And a secondary speed increasing device (not shown) for transmission.
  • the input shaft 21b is connected to the shaft 17 of the end plate 4b in the bearing case 4, and the output shaft 21c is connected to the generator 2.
  • the angle of the rotating shaft may be changed by 90 ° by connecting the output shaft 21c of the gearbox 21 to the generator shaft via a bevel gear or the like.
  • ⁇ Drag-type vertical axis wind turbine> In each embodiment, an example is shown in which the vertical axis wind turbine is a lift type. However, in some cases, the configuration of the present invention may be applied to a drag type vertical axis wind turbine.
  • the rotor support structure is applied to a vertical axis windmill type wind power generator, but the rotor support structure may be applied to a hydraulic power generator.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

Structure de support de pale de rotor pour générateur électrique qui supporte de manière rotative une pale de rotor à axe vertical (1) et transmet la rotation de la pale de rotor (1) à un générateur électrique (2) situé sous la pale de rotor (1). Un carter de palier cylindrique circulaire (4) est monté de façon à être rotatif sur la périphérie externe du carter (5) du générateur électrique (2) à travers des paliers annulaires (9, 9). Le carter de palier (4) est relié de façon coaxiale à la pale de rotor (1) et est relié à l'arbre (2a) du générateur électrique (2). Le carter de palier (4) est pourvu d'un corps de carter cylindrique circulaire (4a) et d'une plaque d'extrémité (4b) qui est disposée à une extrémité axiale du corps de carter (4a) et à laquelle est reliée la pale de rotor (1).
PCT/JP2019/026211 2018-07-09 2019-07-02 Structure de support de pale de rotor pour générateur électrique WO2020013019A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-130131 2018-07-09
JP2018130131A JP7042176B2 (ja) 2018-07-09 2018-07-09 発電機の回転翼支持構造

Publications (1)

Publication Number Publication Date
WO2020013019A1 true WO2020013019A1 (fr) 2020-01-16

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PCT/JP2019/026211 WO2020013019A1 (fr) 2018-07-09 2019-07-02 Structure de support de pale de rotor pour générateur électrique

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WO (1) WO2020013019A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004301087A (ja) * 2003-03-31 2004-10-28 Ebara Corp 垂直軸風車装置
JP2006207374A (ja) * 2005-01-25 2006-08-10 Ise:Kk 風力発電装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101270731A (zh) * 2008-04-25 2008-09-24 陈施宇 风力发电方法及风力发电装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004301087A (ja) * 2003-03-31 2004-10-28 Ebara Corp 垂直軸風車装置
JP2006207374A (ja) * 2005-01-25 2006-08-10 Ise:Kk 風力発電装置

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JP7042176B2 (ja) 2022-03-25
JP2020007978A (ja) 2020-01-16

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