KR101256297B1 - Tidal generator - Google Patents

Tidal generator Download PDF

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Publication number
KR101256297B1
KR101256297B1 KR1020110017101A KR20110017101A KR101256297B1 KR 101256297 B1 KR101256297 B1 KR 101256297B1 KR 1020110017101 A KR1020110017101 A KR 1020110017101A KR 20110017101 A KR20110017101 A KR 20110017101A KR 101256297 B1 KR101256297 B1 KR 101256297B1
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South Korea
Prior art keywords
permanent magnet
housing
circumferential surface
support block
groove
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KR1020110017101A
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Korean (ko)
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KR20120097720A (en
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조윤현
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조윤현
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    • 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
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/26—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide energy
    • F03B13/264—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide energy using the horizontal flow of water resulting from tide movement
    • 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
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/10—Submerged units incorporating electric generators or motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2220/00—Application
    • F05B2220/30—Application in turbines
    • F05B2220/32—Application in turbines in water turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2220/00—Application
    • F05B2220/70—Application in combination with
    • F05B2220/706—Application in combination with an electrical generator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2230/00—Manufacture
    • F05B2230/80—Repairing, retrofitting or upgrading methods
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • 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
    • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient

Abstract

조류 발전기가 개시된다. 상기 조류 발전기는 링형상의 영구자석이 블레이드의 단부에 결합되어 블레이드와 함께 회전하고, 영구자석의 회전에 의하여, 영구자석과 대향하는 전기자에 전기가 생성되므로, 간단한 구조로 전기를 생성할 수 있다. 즉, 종래의 조류 발전기와 같이 증속기 및 발전부가 필요 없으므로, 원가가 절감되고, 유지보수가 간편하다.An algae generator is disclosed. The tidal current generator is a ring-shaped permanent magnet is coupled to the end of the blade rotates with the blade, by the rotation of the permanent magnet, electricity is generated in the armature opposite to the permanent magnet, it is possible to generate electricity with a simple structure . That is, since the speed increaser and the power generation unit are not required as in the conventional tidal current generator, cost is reduced and maintenance is easy.

Description

조류 발전기 {TIDAL GENERATOR}Tidal current generator {TIDAL GENERATOR}

본 발명은 조류 발전기에 관한 것이다.The present invention relates to a tidal current generator.

조류 발전기란 해수 중에 설치되어 해수의 흐름을 이용하여 발전하는 장치이다.An algae generator is a device that is installed in seawater and generates power using the flow of seawater.

일반적으로, 조류발전기는 유체의 흐름에 의하여 회전하면서 유체에 저장된 에너지를 기계에너지로 변환하는 터빈부, 상기 터빈부의 회전력을 증속하는 증속부, 상기 증속부의 회전력을 전달받아 전기를 생성하는 발전부를 가진다.In general, the tidal current generator has a turbine unit for converting the energy stored in the fluid into mechanical energy while rotating by the flow of the fluid, an speed increase unit for increasing the rotational force of the turbine portion, a power generation unit for generating electricity by receiving the rotational force of the speed increase unit .

상기와 같은 종래의 조류발전기는 별도의 증속부가 필요하므로 원가가 상승하고, 증속부의 구조가 복잡하므로 유지보수가 불편한 단점이 있다.Since the conventional tidal current generator as described above requires a separate speed increase unit, the cost increases, and the structure of the speed increase unit is complicated, and thus maintenance is inconvenient.

본 발명은 상기와 같은 종래 기술의 문제점을 해소하기 위하여 안출된 것으로, 본 발명의 목적은 원가를 절감할 수 있고, 유지보수가 편리한 조류 발전기를 제공함에 있다.The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to provide a tidal current generator that can reduce the cost, and is easy to maintain.

상기 목적을 달성하기 위한 본 발명에 따른 조류 발전기는, 해수 중에 설치되며 해수의 흐름을 이용하여 전기를 생성하는 조류 발전기에 있어서,In the algae generator according to the present invention for achieving the above object, in the algae generator is installed in the sea water to generate electricity using the flow of sea water,

하우징; 상기 하우징의 내부에 위치된 허브, 상기 허브의 외주면에 일단부측이 결합된 복수의 블레이드, 상기 블레이드의 타단부에 내주면이 결합되어 상기 블레이드를 지지하며 외주면측은 상기 하우징의 내주면측에 지지된 링형상의 영구자석을 가지면서 해수의 흐름에 의하여 회전하는 터빈부; 상기 영구자석과 대향하는 코어와 상기 코어에 권선된 코일을 가지면서 상기 하우징에 지지 설치되고, 상기 영구자석과 작용하여 전기를 발생하는 전기자를 포함한다.housing; A hub located inside the housing, a plurality of blades having one end coupled to an outer circumferential surface of the hub, and an inner circumferential surface coupled to the other end of the blade to support the blade, and an outer circumferential surface side of which is supported by an inner circumferential surface side of the housing Turbine portion having a permanent magnet of the rotation by the flow of sea water; And an armature supported by the housing while having a core facing the permanent magnet and a coil wound around the core, the armature generating electricity by working with the permanent magnet.

본 발명에 따른 조류 발전기는 링형상의 영구자석이 블레이드의 단부에 결합되어 블레이드와 함께 회전하고, 영구자석의 회전에 의하여, 영구자석과 대향하는 전기자에 전기가 생성되므로, 간단한 구조로 전기를 생성할 수 있다. 즉, 종래의 조류 발전기와 같이 증속기 및 발전부가 필요 없으므로, 원가가 절감되고, 유지보수가 간편하다.In the tidal current generator according to the present invention, the ring-shaped permanent magnet is coupled to the end of the blade to rotate together with the blade, and by rotating the permanent magnet, electricity is generated in the armature opposite to the permanent magnet, thereby generating electricity with a simple structure. can do. That is, since the speed increaser and the power generation unit are not required as in the conventional tidal current generator, cost is reduced and maintenance is easy.

도 1은 본 발명의 일 실시예에 따른 조류 발전기의 구성을 보인 도.
도 2는 도 1에 도시된 터빈부측의 사시도.1 is a view showing the configuration of a tidal current generator according to an embodiment of the present invention.
FIG. 2 is a perspective view of the turbine part side shown in FIG. 1. FIG.

이하, 첨부된 도면을 참조하여 본 발명의 일 실시예에 따른 조류 발전기를 상세히 설명한다.Hereinafter, a tidal current generator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 일 실시예에 따른 조류 발전기의 구성을 보인 도이고, 도 2는 도 1에 도시된 터빈부측의 사시도이다.1 is a view showing the configuration of a tidal current generator according to an embodiment of the present invention, Figure 2 is a perspective view of the turbine side shown in FIG.

도시된 바와 같이, 하우징(110)이 마련된다. 하우징(110)은 단면(斷面)형상이 링형상으로 형성되며 내주면 외측부위에는 링형상을 이루는 실링된 공간(113)이 형성된다. 실링된 공간(113)도 링형상으로 형성된다.As shown, the housing 110 is provided. The housing 110 has a cross-sectional shape in a ring shape, and a sealed space 113 forming a ring shape is formed at an outer portion of the inner circumferential surface. The sealed space 113 is also formed in a ring shape.

하우징(110)의 내부에는 해수의 흐름에 의하여 회전하는 터빈부(120)가 지지 설치된다.The turbine unit 120 that rotates by the flow of sea water is installed inside the housing 110.

터빈부(120)는 허브(121), 허브(121)의 외주면에 일단부측이 결합된 복수의 블레이드(123), 블레이드(123)의 타단부에 내주면이 결합되어 블레이드(123)를 지지하는 링형상의 영구자석(125)을 가진다.The turbine unit 120 includes a hub 121, a plurality of blades 123 having one end coupled to an outer circumferential surface of the hub 121, and an inner circumferential surface coupled to the other end of the blade 123 to support the blade 123. It has a permanent magnet 125 in the shape.

영구자석(125)은 반경방향으로 소정 높이를 가지고, 축방향으로 소정 폭을 가진다. 영구자석(125)의 테두리부측은 하우징(110)의 내주면 중앙부측에 결합된 지지블록(141)에 지지된다. 이는, 후술한다.The permanent magnet 125 has a predetermined height in the radial direction and a predetermined width in the axial direction. The edge portion side of the permanent magnet 125 is supported by the support block 141 coupled to the inner peripheral surface central portion side of the housing 110. This will be described later.

하우징(110)의 공간(113)에는 코어(131)와 코어(131)에 권선된 코일(135)을 가지는 전기자(130)가 설치된다. 전기자(130)는 영구자석(125)과 대향하며, 영구자석(125)이 회전하면, 영구자석(125)과 작용하여 전기를 생성한다.An armature 130 having a core 131 and a coil 135 wound around the core 131 is installed in the space 113 of the housing 110. The armature 130 is opposed to the permanent magnet 125, and when the permanent magnet 125 rotates, it works with the permanent magnet 125 to generate electricity.

전기자(130)가 설치되는 공간(113)은 실링되므로, 하우징(110)이 해수 중에 설치되어도, 해수에 의하여 손상되는 것이 방지된다.Since the space 113 in which the armature 130 is installed is sealed, even if the housing 110 is installed in seawater, it is prevented from being damaged by the seawater.

지지블록(141)은 하우징(110)의 내주면 중앙부측에 일면이 결합된다. 지지블록(141)은, 예를 들면, 육면체 형상으로 형성되어 하우징(110)의 내주면 중앙부측에 원주방향을 따라 등간격으로 복수개 결합된다.One side of the support block 141 is coupled to the central portion of the inner circumferential surface of the housing 110. The support block 141 is formed in, for example, a hexahedral shape, and is coupled to the center portion of the inner circumferential surface of the housing 110 at equal intervals along the circumferential direction.

지지블록(141)에 영구자석(125)의 테두리부측이 삽입되고, 지지블록(141)과 영구자석(125) 사이에는 볼(145)이 개재된다. 볼(145)은 지지블록(141) 및 영구자석(125)과 접촉하여 영구자석(125)을 지지한다.The edge portion of the permanent magnet 125 is inserted into the support block 141, and the ball 145 is interposed between the support block 141 and the permanent magnet 125. The ball 145 contacts the support block 141 and the permanent magnet 125 to support the permanent magnet 125.

상세히 설명하면, 영구자석(125)의 테두리부측은 외주면측에서 중심측으로 갈수록 점점 두께가 두꺼워지는 형태로 경사진 경사부(125a)로 형성된다. 이때, 영구자석(125)의 두께를 이등분하는 가상의 평면을 기준으로 영구자석(125)이 대칭을 이루도록, 경사부(125a)는 영구자석(125)의 좌측면 및 우측면에 각각 동일한 형상으로 형성된다.In detail, the edge portion side of the permanent magnet 125 is formed as an inclined portion 125a inclined in a form that becomes thicker from the outer circumferential surface side toward the center side. At this time, the inclined portion 125a is formed in the same shape on the left side and the right side of the permanent magnet 125 so that the permanent magnet 125 is symmetrical with respect to an imaginary plane bisecting the thickness of the permanent magnet 125. do.

하우징(110)의 내측을 향하는 지지블록(141)의 타면에는 경사부(125a)와 대응되게 경사진 경사홈(141a)이 형성되고, 경사홈(141a)에 경사부(125a)가 삽입된다.The inclined groove 141a is inclined to correspond to the inclined portion 125a on the other surface of the support block 141 facing the inside of the housing 110, and the inclined portion 125a is inserted into the inclined groove 141a.

그리고, 상호 대향하는 경사부(125a)의 좌측면과 경사홈(141a)의 좌측 내면 사이 및 경사부(125a)의 우측면과 경사홈(141a)의 우측 내면 사이에 볼(145)이 각각 개재된다. 이때, 볼이(145)이 지지블록(141)과 영구자석(125)의 경사부(125a) 사이에 안정되게 개재되도록 경사홈(141a)의 좌측 내면 및 우측 내면에는 볼(145)이 삽입 안치되는 안치홈(141b)이 각각 형성된다.A ball 145 is interposed between the left side surface of the inclined portion 125a and the left inner surface of the inclined groove 141a and the right side of the inclined portion 125a and the right inner surface of the inclined groove 141a, respectively. . At this time, the ball 145 is placed on the left inner surface and the right inner surface of the inclined groove 141a so that the ball 145 is stably interposed between the support block 141 and the inclined portion 125a of the permanent magnet 125. Settle grooves 141b are respectively formed.

하우징(110)에 고정된 지지블록(141)에 볼(145)의 일측이 삽입 지지되고, 볼(145)의 타측에 영구자석(125)이 접촉 지지되므로, 영구자석(125)은 볼(145)측으로 유동하지 않는다. 따라서, 영구자석(125)을 포함한 터빈부(120)는 축 방향으로 유동하지 않으면서 안정되게 회전한다.Since one side of the ball 145 is inserted and supported by the support block 141 fixed to the housing 110, and the permanent magnet 125 is supported in contact with the other side of the ball 145, the permanent magnet 125 is the ball 145. Do not flow to the side. Therefore, the turbine unit 120 including the permanent magnet 125 rotates stably without flowing in the axial direction.

본 실시예에 따른 조류 발전기는 링형상의 영구자석(125)이 블레이드(123)에 결합되어 블레이드(123)와 함께 회전하고, 영구자석(125)의 회전에 의하여, 영구자석(125)과 대향하는 전기자(130)에 전기가 생성되므로, 간단한 구조로 전기를 생성할 수 있다. 즉, 종래의 조류 발전기와 같이 증속기 및 발전부가 필요 없으므로, 원가가 절감되고, 유지보수가 간편하다.In the tidal current generator according to the present embodiment, the ring-shaped permanent magnet 125 is coupled to the blade 123 to rotate together with the blade 123, and by the rotation of the permanent magnet 125, the permanent magnet 125 faces the permanent magnet 125. Since electricity is generated in the armature 130, the electricity can be generated with a simple structure. That is, since the speed increaser and the power generation unit are not required as in the conventional tidal current generator, cost is reduced and maintenance is easy.

이상에서는, 본 발명의 일 실시예에 따라 본 발명을 설명하였지만, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 변경 및 변형한 것도 본 발명에 속함은 당연하다.While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Of course.

110 : 하우징 120 : 터빈부
130 : 전기자 141 : 지지블록110 housing 120 turbine part
130: armature 141: support block

Claims (5)

해수 중에 설치되며 해수의 흐름을 이용하여 전기를 생성하는 조류 발전기에 있어서,
하우징;
상기 하우징의 내부에 위치된 허브, 상기 허브의 외주면에 일단부측이 결합된 복수의 블레이드, 상기 블레이드의 타단부에 내주면이 결합되어 상기 블레이드를 지지하며 외주면측은 상기 하우징의 내주면측에 지지된 링형상의 영구자석을 가지면서 해수의 흐름에 의하여 회전하는 터빈부;
상기 영구자석과 대향하는 코어와 상기 코어에 권선된 코일을 가지면서 상기 하우징에 지지 설치되고, 상기 영구자석과 작용하여 전기를 발생하는 전기자를 포함하며,
상기 하우징의 중앙부측 내주면에는 복수의 지지블록의 일면이 결합되고,
상기 지지블록의 타면측에는 상기 영구자석의 테두리부측이 위치되며,
상기 지지블록과 상기 영구자석 사이에는 상기 지지블록 및 상기 영구자석과 각각 접촉하여 상기 영구자석의 회전을 지지하는 복수의 볼이 설치된 것을 특징으로 하는 조류 발전기.In the algae generator which is installed in the sea water and generates electricity by using the flow of sea water,
housing;
A hub located inside the housing, a plurality of blades having one end coupled to an outer circumferential surface of the hub, and an inner circumferential surface coupled to the other end of the blade to support the blade, and an outer circumferential surface side of which is supported by an inner circumferential surface side of the housing Turbine portion having a permanent magnet of the rotation by the flow of sea water;
The arm having a core facing the permanent magnet and a coil wound around the core is installed on the housing, and includes an armature to generate electricity by working with the permanent magnet,
One surface of the plurality of support blocks is coupled to the inner peripheral surface of the central portion side of the housing,
The other side of the support block is located the edge portion of the permanent magnet,
An algae generator, wherein a plurality of balls are installed between the support block and the permanent magnet to support the rotation of the permanent magnet in contact with the support block and the permanent magnet, respectively. 제1항에 있어서,
상기 하우징의 내주면 중앙부측에는 상기 영구자석의 테두리부측이 지지되고,
상기 하우징의 내주면 외측부위에는 상기 영구자석과 대향되게 실링된 공간이 형성되며,
상기 전기자는 상기 하우징의 실링된 공간에 설치된 것을 특징으로 하는 조류 발전기.The method of claim 1,
The edge portion side of the permanent magnet is supported at the central portion of the inner circumferential surface of the housing,
The outer circumferential surface of the housing is formed with a sealed space facing the permanent magnet,
And the armature is installed in a sealed space of the housing. 삭제delete 제2항에 있어서,
상기 영구자석의 테두리부측은 외주면에서 상기 영구자석의 중심으로 갈수록 점점 두께가 두꺼워지는 형태로 경사진 경사부로 형성되고,
상기 지지블록의 타면에는 상기 경사부와 대응되게 경사진 경사홈이 형성되어 상기 경사부가 삽입되며,
상호 대향하는 상기 경사부의 일측면과 상기 경사홈의 일내면(一內面) 사이 및 상기 경사부의 타측면과 상기 경사홈의 타내면(他內面) 사이에 상기 볼이 개재된 것을 특징으로 하는 조류 발전기.The method of claim 2,
The edge portion side of the permanent magnet is formed as an inclined portion inclined in the form gradually thicker toward the center of the permanent magnet from the outer peripheral surface,
On the other surface of the support block is formed an inclined groove inclined to correspond to the inclined portion is inserted into the inclined portion,
Characterized in that the ball is interposed between one side surface of the inclined portion and one inner surface of the inclined groove facing each other and between the other side surface of the inclined portion and the other inner surface of the inclined groove. Algae generator. 제4항에 있어서,
상기 경사홈의 일내면 및 타내면에는 상기 볼이 삽입 안치되는 안치홈이 각각 형성된 것을 특징으로 하는 조류 발전기.5. The method of claim 4,
A tidal current generator, characterized in that the inner groove and the other inner surface of the inclined groove is formed with a settling groove is inserted into the ball.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200000737A (en) 2018-06-25 2020-01-03 주식회사 금성이앤씨 Tidal power generating apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1077996A (en) 1996-09-03 1998-03-24 Fujita Corp Rotary blade
KR20020087663A (en) * 2001-05-15 2002-11-23 한국전기연구원 wind power generation system using diffuser with the integrated blade and generator rotor
JP2007336783A (en) * 2006-06-19 2007-12-27 Univ Kansai Generator, wind power generation method, and water power generation method
KR20090104059A (en) * 2007-01-04 2009-10-05 씨-파워 리미티드 Tidal electricity generating apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1077996A (en) 1996-09-03 1998-03-24 Fujita Corp Rotary blade
KR20020087663A (en) * 2001-05-15 2002-11-23 한국전기연구원 wind power generation system using diffuser with the integrated blade and generator rotor
JP2007336783A (en) * 2006-06-19 2007-12-27 Univ Kansai Generator, wind power generation method, and water power generation method
KR20090104059A (en) * 2007-01-04 2009-10-05 씨-파워 리미티드 Tidal electricity generating apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200000737A (en) 2018-06-25 2020-01-03 주식회사 금성이앤씨 Tidal power generating apparatus

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