Blade assembly for wind power generator and wind power generator having same

Abstract

This blade assembly for a wind power generator comprises: a shaft unit which includes a first shaft comprising a column-shaped first shaft unit and straight-line openings formed in the outer side surface of the first shaft unit along a straight line parallel to the axial direction of the first shaft unit, and a second shaft comprising a column-shaped second shaft unit arranged in parallel with the first shaft unit and spiral openings connected to the straight-line openings and formed in a spiral shape in the outer side surface of the second shaft unit along the axial direction thereof; and blades, each comprising a blade body unit in a spiral shape, a straight-line coupling unit disposed in the inner edge of the blade body unit to be inserted in the respective straight-line opening to be coupled thereto, and a spiral coupling unit having a spiral shape and extending from the straight-line coupling unit along the inner edge and inserted in the respective spiral opening unit to be coupled thereto.

Description

Blade assembly for a wind turbine and a wind turbine having the same

[0001] The present invention relates to a blade assembly for a wind turbine and a wind turbine having the same.

[0002] Generally, the blades of wind turbines, which are rotated by wind, are being developed in various forms depending on wind speed, power generation capacity, and generation location.

[0003] Among the various types of wind turbine blades, horizontal-type spiral blades, with their horizontally positioned rotation axes, have the advantage of being able to achieve high power generation while maintaining a compact size.

[0004] Korean Registered Patent No. 1794037 (published on November 7, 2017) discloses a method of integrally joining a blade formed by bending a metal plate into a spiral shape to a shaft by welding it.

[0005] Korean Patent No. 1578745 (published on December 21, 2015) discloses a technology for fixing a spiral wing unit made of various materials to a rotation axis.

[0006] When the blade is fixed integrally to the shaft as in Registered Patent No. 1794037 and Registered Patent No. 1578745, there is a problem in that some of the blades among the multiple blades cannot be selectively replaced.

[0007] In order to resolve such problems, Korean registered patent No. 2219323 (registered on February 17, 2021) proposed a fixing structure that prevents the blade from separating from the shaft due to centrifugal force when the spiral blade rotates.

[0008] In registered patent No. 2219323, a support (3) having a band shape is formed at the end of the blade (4), and after placing the support (3) on the outer surface of the shaft (2), the support (3) and the shaft (2) are fixed by applying pressure using a pressure member (5).

[0009] However, registered patent No. 2219323 allows the blade (4) to be selectively replaced by placing a support (3) on the outer surface of the shaft (2) and then fixing the blade (4) to the shaft (2) using a pressure member (5). On the other hand, registered patent No. 2219323 has a problem in that a gap is created between the pressure member (5), the support (3), and the shaft (2) due to continuous vibrations that occur as the blade (4) rotates, which can cause noise and damage to the blade (4) due to excessive vibration.

[0010] [Prior Art Literature]

[0011] [Patent Literature]

[0012] (Patent Document 0001) KR 10-1794037 B1 (20171107)

[0013] (Patent Document 0002) KR 10-1578745 B1 (20151221)

[0014] (Patent Document 0003) KR 10-2219323 B1 (20210217)

[0015] The present invention provides a blade assembly for a wind turbine and a wind turbine having the same, which can reduce noise and vibration by forming a coupling groove concavely formed from the outer surface of the shaft, deviating from the method of placing a blade on the outer surface of the shaft, and inserting the blade into the coupling groove of the shaft to suppress the occurrence of a gap between the blade and the shaft.

[0016] In addition, the present invention provides a blade assembly for a wind turbine that can selectively replace a damaged blade among a plurality of blades coupled to a shaft, and a wind turbine having the same.

[0017] As an embodiment, a blade assembly for a wind turbine comprises: a shaft unit including a first shaft having a columnar shape and a straight opening formed in a straight line parallel to the axial direction of the first shaft from the outer surface of the first shaft, a second shaft having a columnar shape arranged in series with the first shaft, and a second shaft having a spiral opening formed in a spiral shape along the axial direction of the second shaft from the outer surface of the second shaft that communicates with the straight opening; and a blade having a blade body having a spiral shape, a straight connecting part having a straight shape that is inserted into and coupled to the straight opening in the inner rim of the blade body, and a spiral connecting part having a spiral shape that extends from the straight connecting part in the inner rim and is inserted into and coupled to the spiral opening.

[0018] The straight opening of the blade assembly for a wind turbine includes a straight expansion groove that extends widely inward from the straight opening toward the first shaft portion and is coupled to the straight coupling portion in a fit manner, and the spiral opening includes a spiral expansion groove that extends widely inward from the spiral opening toward the second shaft portion and is coupled to the spiral coupling portion in a fit manner.

[0019] A first through hole is formed in the first shaft portion of the blade assembly for a wind turbine, penetrating both ends of the first shaft portion, and a second through hole is formed in the second shaft portion, penetrating both ends of the second shaft portion and communicating with the first through hole. In order to connect the first and second shaft portions in series and prevent twisting of the first and second shaft portions, a connecting member having a rod shape is inserted into the first and second through holes.

[0020] In a state where the first shaft and the second shaft of a blade assembly for a wind turbine are arranged and in contact in a serial configuration, a first fastening portion is formed at the end of the first shaft portion, and a second fastening portion corresponding to the first fastening portion is formed at the end of the second shaft portion that contacts the end of the first shaft portion, and the first and second fastening portions are mutually fastened by a fastening screw.

[0021] Three straight openings are formed at equal intervals in the first shaft of the blade assembly for a wind turbine, and three spiral openings communicating with the three straight openings are formed at equal intervals in the second shaft.

[0022] As an embodiment, the wind turbine comprises a shaft unit including a first shaft having a column shape and a straight opening formed in a straight line parallel to the axial direction of the first shaft from the outer surface of the first shaft, a second shaft having a column shape arranged in series with the first shaft, and a second shaft having a spiral opening formed in a spiral shape along the axial direction of the second shaft from the outer surface of the second shaft and communicating with the straight opening; a blade assembly for a wind turbine comprising a blade having a spiral shape, a straight connecting part having a straight shape that is inserted into and coupled to the straight opening on the inner edge of the blade body, and a spiral connecting part having a spiral shape that extends from the straight connecting part on the inner edge and is inserted into and coupled to the spiral opening; a support unit that rotatably supports the first shaft and the second shaft; and a power generation unit coupled to either the first or the second shaft to generate electricity by the rotation of the shaft unit.

[0023] The straight opening of the wind turbine includes a straight expansion groove that extends widely inward from the straight opening toward the first shaft portion and is coupled to the straight coupling portion in a fitting manner, and the spiral opening includes a spiral expansion groove that extends widely inward from the spiral opening toward the second shaft portion and is coupled to the spiral coupling portion in a fitting manner.

[0024] The blade assembly for a wind turbine according to the present invention and the wind turbine having the same provide a method of arranging blades on the outer surface of a shaft, wherein a coupling groove formed concavely from the outer surface of the shaft is formed, and the blade is inserted into the coupling groove of the shaft to suppress the occurrence of a gap between the blade and the shaft, thereby reducing noise and vibration, and a blade assembly for a wind turbine having the same can selectively replace a damaged blade among a plurality of blades coupled to the shaft.

[0025] FIG. 1 is an external perspective view illustrating a blade assembly for a wind turbine according to an embodiment of the present invention.

[0026] Figure 2 is an exploded perspective view of Figure 1.

[0027] Figure 3 is an exploded perspective view of the shaft unit shown in Figures 1 and 2.

[0028] FIG. 4a is a plan view showing a cross-section of the first shaft.

[0029] FIG. 4b is a plan view showing a cross-section of the second shaft.

[0030] Figure 5 is an excerpt perspective view of the blade shown in Figures 1 and 2.

[0031] Figure 6 is a cross-sectional view showing the state in which the blade is coupled to the shaft unit.

[0032] FIG. 7 is a side view illustrating a wind turbine according to an embodiment of the present invention.

[0033] The present invention described below is capable of various modifications and may have various embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description.

[0034] However, this is not intended to limit the invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. In describing the invention, detailed descriptions of related prior art are omitted if it is determined that such detailed descriptions may obscure the essence of the invention.

[0035] The terms used in this patent are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this patent, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0036] Additionally, terms such as "first," "second," etc., may be used to distinguish and describe various components, but said components shall not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0037] In addition, if at least two different embodiments are described in this patent, each embodiment may use all or part of its components in combination and mixed with one another without further description, as long as it does not deviate from the technical concept of the present invention.

[0038] FIG. 1 is an external perspective view illustrating a blade assembly for a wind turbine according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of FIG. 1. FIG. 3 is an exploded perspective view of a shaft unit illustrated in FIG. 1 and FIG. 2. FIG. 4a is a plan view illustrating a cross-section of a first shaft. FIG. 4b is a plan view illustrating a cross-section of a second shaft.

[0039] Referring to FIG. 1, a blade assembly (100) for a wind turbine includes a shaft unit (100) and a blade (200).

[0040] The shaft unit (100) is coupled to the blade (200). The shaft unit (100) rotates together with the blade (200) by the rotation of the blade (200).

[0041] Referring to FIGS. 2 and 3, the shaft unit (100) includes a first shaft (110) and a second shaft (120). In addition, the shaft unit (100) may further include a connecting member (130).

[0042] Referring to FIGS. 3 and FIGS. 4a, the first shaft (110) includes a first shaft portion (112) and a straight opening (114).

[0043] The first shaft portion (112) may have a columnar shape, for example, a cylinder shape. Alternatively, the first shaft portion (112) may have various polygonal columnar shapes other than a cylinder.

[0044] A straight opening (114) is formed on the outer surface of the first shaft portion (112), and the straight opening (114) is formed in a straight line parallel to the axial direction of the first shaft portion (112), and the straight opening (114) is formed continuously from one end of the first shaft portion (112) to the other end.

[0045] A plurality of straight openings (114) may be formed at equal intervals on the outer surface of the first shaft portion (112). At this time, the number of straight openings (114) is equal to the number of blades (200) mounted on the shaft unit (100). For example, when three blades (200) are coupled to the shaft unit (100), three straight openings (114) are formed at equal intervals on the outer surface of the first shaft portion (112).

[0046] A straight expansion groove (116) is formed in the straight opening (114) that extends widely inward from the straight opening (114) toward the first shaft portion (112). The width (D2) of the straight expansion groove (116) is formed wider than the width (D1) of the straight opening (114), and as a result, the straight coupling portion (210) of the blade (200), which will be described later, is coupled to the straight expansion groove (116) in a fitting manner. The straight coupling portion (210) of the blade (200) is prevented from detaching from the first shaft portion (112) by the straight expansion groove (116).

[0047] A first through hole (117) is formed in the center of the first shaft portion (112) and penetrates one end and the other end of the first shaft portion (112). The first through hole (117) may be formed in a polygonal shape when viewed in a planar view.

[0048] A groove (113) penetrating a straight opening (114) may be formed on the side of the first shaft portion (112), and a fastening screw (113a) and a nut (113b) coupled to the fastening screw (113a) may be inserted into the groove (113). The fastening screw (113a) and the nut (113b) prevent the blade (200) from detaching from the straight opening (114). Additionally, the fastening screw (113a) and the nut (113b) ensure that the first shaft portion (112) is strongly pressed against the straight coupling portion (210) of the blade (200), thereby preventing vibration from occurring between the blade (200) and the first shaft portion (112).

[0049] Referring to FIGS. 3 and FIGS. 4b, the second shaft (120) includes a second shaft portion (122) and a spiral opening (124).

[0050] The second shaft portion (122) may have a columnar shape, for example, a cylinder shape. Alternatively, the second shaft portion (122) may have various polygonal columnar shapes other than a cylinder. In one embodiment of the present invention, the second shaft portion (122) may have the same diameter as the first shaft portion (112).

[0051] A spiral opening (124) is formed on the outer surface of the second shaft portion (122), and the spiral opening (124) is formed in a spiral shape along the axial direction of the second shaft portion (122), and the spiral opening (124) is formed continuously from one end of the second shaft portion (122) to the other end. In one embodiment of the present invention, the spiral opening (124) is formed with the same size as the straight opening (114) of the first shaft (110) described above.

[0052] A plurality of spiral openings (124) may be formed at equal intervals on the outer surface of the second shaft portion (122). At this time, the number of spiral openings (124) is equal to the number of blades (200) mounted on the shaft unit (100) and equal to the number of straight openings (114) of the first shaft (110) described above. For example, when three blades (200) are coupled to the shaft unit (100), three spiral openings (124) are formed at equal intervals on the outer surface of the second shaft portion (122).

[0053] In one embodiment of the present invention, each straight opening (114) formed in the first shaft (110) is connected to each spiral opening (124) formed in the second shaft (120).

[0054] In the spiral opening (124), a spiral expansion groove (126) is formed that extends widely from the spiral opening (124) toward the inside of the second shaft portion (122). The width (D2) of the spiral expansion groove (126) is formed to be wider than the width (D1) of the spiral opening (124), and as a result, the spiral coupling portion (220) of the blade (200), which will be described later, is coupled to the spiral expansion groove (126) in a fitting manner. The spiral coupling portion (220) of the blade (200) is prevented from detaching from the second shaft portion (122) by the spiral expansion groove (126).

[0055] A second through hole (127) is formed in the center of the second shaft portion (122) and penetrates one end and the other end of the second shaft portion (122). The second through hole (127) may be formed in a polygonal shape when viewed in a planar view.

[0056] Meanwhile, a groove (123) penetrating the spiral opening (124) may be formed on the side of the second shaft portion (122), and a fastening screw (123a) and a nut (123b) coupled to the fastening screw (123a) may be inserted into the groove (123). The fastening screw (123a) and the nut (123b) prevent the blade (200) from detaching from the spiral opening (124). In addition, the fastening screw (123a) and the nut (123b) ensure that the second shaft portion (122) is strongly pressed against the spiral coupling portion (220) of the blade (200), thereby preventing vibration from occurring between the blade (200) and the second shaft portion (122).

[0057] Referring again to FIG. 3, in one embodiment of the present invention, the first shaft (110) and the second shaft (120) may be arranged in series.

[0058] When the first and second shafts (110, 120) are arranged in series, the straight opening (114) of the first shaft (110) and the spiral opening (124) of the second shaft (120) are connected to each other.

[0059] Meanwhile, the connecting member (130) prevents the first and second shafts (110, 120) arranged in series from being twisted or separated, and the connecting member (130) is inserted into the first through hole (117) of the first shaft (110) and the second through hole (127) of the second shaft (120).

[0060] Meanwhile, in a state where the first shaft (110) and the second shaft (120) are arranged in series, a first fastening part (119) is formed at the end of the first shaft part (112) to combine the first and second shafts (110, 120), and a second fastening part (129) corresponding to the first fastening part (119) is formed at the end of the second shaft part (122) that contacts the end of the first shaft part (112).

[0061] With the first shaft (110) and the second shaft (120) in contact with each other in a serial configuration, the first and second fastening parts (119, 129) are arranged facing each other, and the first and second fastening parts (119, 129) arranged facing each other can be joined together by means of fastening screws and nuts, etc.

[0062] Figure 5 is an excerpt perspective view of the blade shown in Figures 1 and 2.

[0063] Referring to FIGS. 2 and FIGS. 5, a plurality of blades (200) are coupled to a shaft unit (100), and the shaft unit (100) rotates as the blades (200) rotate due to wind. For example, three blades (200) may be coupled to the shaft unit (100) in an overlapping manner.

[0064] Each blade (200) has a blade body (205) in a spiral shape so that rotational force is generated by the incoming wind. Additionally, the blade body (205) has an outer rim (201) and an inner rim (202). The inner rim (202) is coupled to the first shaft (110) and the second shaft (120) of the shaft unit (100) described above.

[0065] A straight joint (220) and a spiral joint (230) are formed on the inner edge (202) of the blade body (205).

[0066] A straight connecting portion (220) is formed at the top of the inner edge (202) of the blade body portion (205), and the straight connecting portion (220) is inserted into the straight opening (114) and straight extension portion (116) of the first shaft (110) and connected to the first shaft (110).

[0067] The straight joint portion (220) is formed in a straight shape. The straight joint portion (220) is formed thicker than the thickness of the blade body portion (205) from the inner edge (202) of the blade body portion (205), and the straight joint portion (220) can be formed in a 'T' shape suitable for fitting into the straight extension portion (116) of the first shaft (110). By fitting the straight joint portion (220) into the straight extension portion (116) of the first shaft (110), the blade body portion (205) can be detachably coupled to the first shaft (110).

[0068] The spiral joint (230) is formed at the bottom of the inner edge (202) of the blade body (205), and the spiral joint (230) is inserted into the spiral opening (124) and spiral extension (126) of the second shaft (120) and is coupled to the second shaft (120).

[0069] The spiral joint (230) extends from the straight joint (220), and the spiral joint (230) can be formed integrally with the straight joint (220).

[0070] The spiral coupling portion (230) is formed in a spiral shape so as to be inserted into the spiral opening (124) of the second shaft (120). The spiral coupling portion (230) is formed thicker than the thickness of the blade body portion (205) from the inner edge (202) of the blade body portion (205), and the spiral coupling portion (230) can be formed in a 'T' shape that fits into the spiral extension portion (126) of the second shaft (120). By fitting the spiral coupling portion (230) into the spiral extension portion (126) of the second shaft (120), the blade body portion (205) can be detachably coupled to the second shaft (120).

[0071] Figure 6 is a cross-sectional view showing the state in which the blade is coupled to the shaft unit.

[0072] Referring to FIG. 6, the straight connecting portion (220) of the blade (200) is inserted into the straight opening (114) of the first shaft (110) with respect to the blade (200), and the spiral connecting portion (230) of the blade (200) is inserted into the spiral opening (124) of the second shaft (120), so that the first and second shafts (110, 120) and the blade (200) are connected.

[0073] After the blade (200) is coupled to the first and second shafts (110, 120), the first and second shafts (110, 120) are coupled to the first and second fastening parts (119, 129) described above, so that the first and second shafts (110, 120) are coupled to each other.

[0074] FIG. 7 is a side view illustrating a wind turbine according to an embodiment of the present invention. The blade assembly for the wind turbine shown in FIG. 7 has substantially the same configuration as the blade assembly for the wind turbine shown in FIG. 1 to 6, and the same names and reference numerals are assigned to the same configurations.

[0075] Referring to FIGS. 2 and FIGS. 7, the wind turbine (600) includes a blade assembly (300) for the wind turbine, a support unit (400), and a power generation unit (500).

[0076] The support unit (400) rotatably supports the first shaft (110) and the second shaft (120) of the blade assembly (300) for a wind turbine. The support unit (400) may include a frame having a Y-shape, and the support unit (400) has a configuration that allows for direction change according to the wind direction.

[0077] The power generation unit (500) is coupled to either the first shaft (110) or the second shaft (120) and generates electricity by the rotation of the shaft unit (100) caused by the rotation of the blade (200).

[0078] As described in detail above, the blade assembly for a wind turbine according to the present invention and the wind turbine having the same can reduce noise and vibration by forming a coupling groove formed concavely from the outer surface of the shaft, deviating from the method of arranging blades on the outer surface of the shaft, and inserting the blade into the coupling groove of the shaft to suppress the occurrence of a gap between the blade and the shaft, and can selectively replace a damaged blade among a plurality of blades coupled to the shaft.

[0079] Meanwhile, the embodiments disclosed in this drawing are merely specific examples provided to aid understanding and are not intended to limit the scope of the invention. It is obvious to those skilled in the art that other variations based on the technical concept of the invention are possible in addition to the embodiments disclosed herein.

[0080] [Explanation of the symbol]

[0081] 100...Shaft Unit 200...Blade

Claims

1. A first shaft comprising a first shaft portion having a columnar shape and a straight opening formed in a straight line parallel to the axial direction of the first shaft portion from the outer surface of the first shaft portion, and A shaft unit comprising a second shaft including a second shaft portion arranged in series with the first shaft portion in a column shape and a spiral opening communicating with the straight opening and formed in a spiral shape along the axial direction of the second shaft portion from the outer surface of the second shaft portion; and A blade assembly for a wind power generator comprising a blade body portion having a spiral shape, a straight connecting portion having a straight shape that is inserted into and coupled to the straight opening in the inner rim of the blade body portion, and a blade having a spiral connecting portion having a spiral shape that extends from the straight connecting portion in the inner rim and is inserted into and coupled to the spiral opening.

2. In Paragraph 1, The above straight opening includes a straight expansion groove that extends widely from the straight opening toward the inside of the first shaft portion and is coupled to the straight coupling portion in a fitting manner. A blade assembly for a wind turbine, comprising a spiral opening that extends widely from the spiral opening into the interior of the second shaft portion and includes a spiral expansion groove that is joined to the spiral coupling portion in a fitting manner.

3. In Paragraph 1, A first through hole is formed in the first shaft portion that penetrates both ends of the first shaft portion, and A second through hole is formed in the second shaft portion that penetrates both ends of the second shaft portion and communicates with the first through hole. A blade assembly for a wind turbine, wherein a connecting member having a rod shape is inserted into the first and second through holes to connect the first and second shaft sections in series and prevent twisting of the first and second shaft sections.

4. In Paragraph 1, With the first shaft and the second shaft arranged and in contact in a serial configuration, A first fastening portion is formed at the end of the first shaft portion, and A second fastening portion corresponding to the first fastening portion is formed at the end of the second shaft portion that contacts the end of the first shaft portion, and The above first and second fastening parts are a blade assembly for a wind turbine that is mutually fastened by a fastening screw.

5. In Paragraph 1, Three straight openings are formed at equal intervals in the first shaft, and A blade assembly for a wind turbine, wherein three spiral openings communicating with three straight openings are formed at equal intervals on the second shaft.

6. A blade assembly for a wind power generator comprising: a first shaft including a first shaft portion having a columnar shape and a straight opening formed in a straight line parallel to the axial direction of the first shaft portion from the outer surface of the first shaft portion; a second shaft portion arranged in series with the first shaft portion having a columnar shape and a second shaft including a spiral opening formed in a spiral shape along the axial direction of the second shaft portion from the outer surface of the second shaft portion and communicating with the straight opening; and a blade having a blade including a blade having a spiral shape, a straight connecting portion having a straight shape that is inserted into and coupled to the straight opening among the inner rim of the blade body portion, and a spiral connecting portion having a spiral shape that extends from the straight connecting portion among the inner rim and is inserted into and coupled to the spiral opening. A support unit that rotatably supports the first shaft and the second shaft; and A wind power generator comprising a power generation unit coupled to either of the first or second shafts and generating electricity by the rotation of the shaft unit.

7. In Paragraph 6, The above straight opening includes a straight expansion groove that extends widely from the straight opening toward the inside of the first shaft portion and is coupled to the straight coupling portion in a fitting manner. A wind turbine comprising a spiral opening that extends widely from the spiral opening into the interior of the second shaft portion and includes a spiral expansion groove that is joined to the spiral coupling portion in a fitted manner.

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