WO2012148012A1

WO2012148012A1 - Rotor blade for a tidal power generating turbine and method for manufacturing same

Info

Publication number: WO2012148012A1
Application number: PCT/KR2011/003031
Authority: WO
Inventors: 김도형; 남성현
Original assignee: 주식회사 포스코건설
Priority date: 2011-04-26
Filing date: 2011-04-26
Publication date: 2012-11-01

Abstract

The present invention relates to a rotor blade for a tidal power generating turbine and a method for manufacturing same, the rotor blade comprising: a rotor hub unit combined with a rotation axis of a turbine; a blade root unit combined symmetrically with the rotor hub unit to support a blade; a blade body unit where a plurality of blade blocks are sequentially combined with the blade root unit to form an airfoil shape of the blade; and a blade tip unit combined with the edge of the blade body unit to form a blade tip. Therefore, the present invention has the effects of, by dividing the blade body unit into a plurality of block shapes for assembly, the mass production of the blade being possible, moldability being superior, and the molding of a curved surface of a fine airfoil also being possible.

Description

Rotor blades for tidal power turbines and manufacturing method

The present invention relates to a rotor blade for a tidal power turbine and a method for manufacturing the same, and more particularly to a rotor blade for a tidal power turbine for producing electric power using the flow of sea water and a manufacturing method thereof.

The tidal current generator is a generator that uses the flow of seawater, and has a structure similar to that of an onshore wind power generator, and the structural strength and sea salt of a rotor blade for converting the flow energy of seawater, which is small in size but 1000 times the air density, into electrical energy. It should be made of corrosion-resistant material that can withstand corrosion.

The rotor blade for a conventional horizontal axis tidal power turbine is a composite material using carbon fiber or glass fiber reinforced plastic (FRP) and has an integral structure from the hub to the tip of the rotor. Most wind blades and their shape and manufacturing method are similar.

The blade manufacturing method using the composite material takes a long time for laminating work such as carbon fiber and the bonding material, that is, the bonding material, which causes a process delay when mass production is needed, such as the construction of a tidal power plant in the future. There is a problem that the life is not sufficiently satisfied in the marine environment.

In addition, when manufacturing a large blade for commercialization, it is not easy to manage the manufacturing process, such as affecting the quality and manufacturing process of the entire blade when a local failure occurs. Therefore, such a conventional blade has a problem that it is not suitable for mass production in preparation for commercialization.

In addition, the turbine blades for tidal power used in seawater have the same bending moments generated by the flow of seawater and the loads with periodic characteristics due to the waves, as well as the sudden impact loads caused by objects floating in the polluted marine environment. It is frequently given and there is a risk of damage.

In particular, the blade of the conventional one-piece structure is limited in flexibility due to impact due to the elastic deformation limit of the composite material and the inner frame of the bending moment, the impact force is transmitted to the inside of the generator through the turbine shaft to cause a series of damage There is a problem caused.

Therefore, the turbine blade for tidal power generation in the marine environment requires a structure that can be flexibly deformed in the event of an unexpected shock over the designed static load and a structure capable of absorbing a part of the instantaneous impact force.

In addition, the flow rate of algae should be more than 2.5m / s due to the nature of algal power resources, but the market size is controversial because such areas are limited on the domestic coast. In addition, the current maneuvering speed of the turbine is about 1.2m / s, the narrower the scope of the marine area with a viable flow rate.

Therefore, in order to expand the market size, a turbine technology capable of operating at low speed is necessary, and for this purpose, weight reduction of the blade is inevitable. In addition, since the turbine blade for algae generation is used in the marine environment, the use of corrosion-resistant materials is also inevitable.

The present invention has been made to solve the above-mentioned conventional problems, mass production of the blade is possible, can be flexibly deformed at the time of the sudden impact of the ocean and at the same time absorbs a certain portion of the instantaneous impact, starting at a low flow rate It is an object of the present invention to provide a rotor blade for an algae turbine having excellent corrosion resistance and a method of manufacturing the same, to minimize energy conversion loss and to be used in a marine environment.

The present invention for achieving the above object, the rotor hub coupled to the rotary shaft of the turbine; A blade root portion symmetrically coupled to the rotor hub portion to support a blade; A blade body portion in which a plurality of blade blocks are sequentially coupled to the blade root portion to form an airfoil shape of the blade; And a blade tip portion coupled to the outermost portion of the blade body portion to form a blade tip.

The blade body of the present invention is a blade block coupled to a plurality of sequentially in one of the blade root portion; Diaphragms coupled between the blade blocks; An impact absorber coupled between the blade block and the diaphragm to absorb the impact between the blade blocks; A main shaft and an auxiliary shaft installed between the diaphragms so as to support the diaphragm apart from each other and fixed to the blade root; And an auxiliary wire provided between the edges of the diaphragm so as to support the tension force between the diaphragms.

The main shaft, the auxiliary shaft and the auxiliary wire of the present invention are coupled between the diaphragm through the blade block.

The main shaft of the present invention is installed in front of all the diaphragm to support the bending moment between all diaphragms, and the auxiliary shaft is installed at the rear between some diaphragms to assist the bending moment between some diaphragms. .

In another aspect, the present invention is a method of manufacturing a rotor blade for a tidal power turbine described above, comprising the steps of: fixing the main shaft to the blade root; Inserting and coupling a blade block to the main shaft; Inserting a shock absorber after coupling the blade block; Installing a diaphragm between the blade blocks and fixing an auxiliary shaft and an auxiliary wire; Repeatedly installing the blade block up to the blade tip to complete the blade body; Coupling the blade hub to the blade body after completing the blade body; And performing a seaweed growth prevention coating and a metal corrosion prevention coating.

As described above, the present invention divides the blade body into a plurality of block shapes and assembles it, thereby enabling mass production of the blade, and excellent moldability, and the effect of enabling the formation of sophisticated airfoil curved surfaces. to provide.

In addition, by blocking the blade body portion, it is possible to reduce the cost and time required for the manufacture and maintenance of the blade.

Steel frame such as main shaft, auxiliary shaft, auxiliary wire, etc. is formed in the blade main body with truss structure, so that the bending moment of the blade and tension force on the outer surface can be realized when bending deformation occurs in the blade. do.

The shock absorbing material inserted between the blade blocks ensures the shock absorbing effect and the flexibility of deformation of the blades at the moment of impact that can occur in seawater, and not only protects the blade, but also enables flexible bending deformation against sudden collisions. It is possible to minimize or prevent the fatigue damage caused by the periodic fluctuations or vibration caused by the vortex and the periodic wave force, and to reduce the damage that can occur to the turbine body, such as the rotor shaft and generator.

By forming the blade block made of plastic material, it is possible to reduce the initial maneuvering speed of the rotor by reducing the weight of the blade, thereby providing an effect of widening the range of marine areas where tidal power is possible and expanding the market size of the tidal power generation.

1 is a block diagram showing a rotor blade for a tidal power turbine according to an embodiment of the present invention.

Figure 2 is a detailed view showing the rotor blades for tidal power turbine according to an embodiment of the present invention.

Figure 3 is an internal configuration showing a rotor blade for tidal power turbine according to an embodiment of the present invention.

Figure 4 is an enlarged configuration showing a rotor blade for tidal power turbine according to an embodiment of the present invention.

5 is an exploded view showing a rotor blade for a tidal power turbine according to an embodiment of the present invention.

6 is a flow chart showing a manufacturing method of a rotor blade for a tidal power turbine according to an embodiment of the present invention.

10: rotor hub portion 20: blade root portion

30: blade body portion 40: blade tip portion

Hereinafter, with reference to the accompanying drawings will be described in more detail the rotor blade for tidal power turbine according to an embodiment of the present invention.

1 is a block diagram showing a rotor blade for tidal power turbine according to an embodiment of the present invention, Figure 2 is a detailed view showing a rotor blade for a tidal power turbine according to an embodiment of the present invention, Figure 3 4 is an enlarged configuration diagram illustrating a rotor blade for a tidal power turbine according to an embodiment of the present invention, and FIG. 4 is an enlarged view illustrating a rotor blade for a tidal power turbine according to an embodiment of the present invention, and FIG. An exploded view showing a rotor blade for a tidal power turbine according to an embodiment.

As shown in FIG. 1, the rotor blade for the tidal power turbine of the present embodiment includes a rotor hub portion 10, a blade root portion 20, a blade body portion 30, and a blade tip portion 40.

The rotor hub portion 10 is formed in a cone shape and is coupled to the rotary shaft of the turbine to transmit the rotational force.

The blade root portion 20 is symmetrically coupled to both ends of the rotor hub portion 10 and serves as a root for supporting the blade body portion 30. Since the blade root portion 20 is given a considerable load during the rotation of the blade, in particular the maximum bending moment of the blade acts, it is preferable to manufacture using a metal material excellent in rigidity to withstand such a load. As such, the blade root portion 20 of the metal material is manufactured through a manufacturing process such as surface processing and painting after fabrication of a casting having a reinforcing structure therein.

Blade body portion 30 is a plurality of blade blocks are sequentially coupled to the blade root portion 20 to form an airfoil shape of the blade, made of lightweight materials such as synthetic resin to reduce the weight of the blade It is desirable to.

As shown in Figures 2 to 5, such a blade body portion 30 is a blade block 31, diaphragm 32, shock absorber 33, main shaft 34, auxiliary shaft 35, auxiliary wire ( 36).

The blade block 31 is formed in the shape of an airfoil (airfoil) so that a plurality of blade root portions 20 are sequentially coupled to constitute a main component of the blade body portion 10. In addition, the blade block 31 is formed of a plurality of lightweight plastic blocks divided in the longitudinal direction of the blade can of course reduce the weight of the blade.

In addition, a plurality of through holes are formed at both end surfaces of the blade block 31 so that the main shaft 34, the auxiliary shaft 35, and the auxiliary wire 36 are inserted through the blade blocks 31. Will be.

Since the blade block 31 uses a plastic material that satisfies the required strength, has corrosion resistance to seawater salts, and is divided into an appropriate size and can be mass-produced, the blade block 31 is applied with general injection molding. According to the location shape of each block, injection molding is performed after manufacturing a separate mold, which enables mass production in a short time.

The diaphragm 32 is inserted between the blade blocks 31, but a plurality of coupling holes are formed in the diaphragm so that the blade block 31, the main shaft 34, the auxiliary shaft 35 and the auxiliary wire 36 are coupled to each other. So they are fixed. Thus, the diaphragm 32 serves to fix the main shaft 34, the auxiliary shaft 35 and the auxiliary wire 36, it is preferably formed of a metal material.

The shock absorbing material 33 is inserted and coupled between the blade block 31 and the diaphragm 32 to mitigate the impact between each blade block 31 in the event of bending due to an unexpected impact on the blade body portion 30 and is flexible. It maintains bending strain. The shock absorbing material 33 is preferably formed of an elastic material such as rubber, urethane, or seawater resistant elastic material so as to easily absorb shock between the blade blocks 31.

In addition, the shock absorbing material 33 secures the primary shock absorbing effect and deformation flexibility of the blades at the moment of impact on the sudden impact force that can be generated in the sea water, that is, the wave force of the resonant cycle, the inflow and collision of floating objects in the sea water, In addition to protecting the blades, flexible bending deformation is possible against sudden collisions, minimizing or preventing fatigue damage caused by periodic fluctuations in the incident flow rate or vibrations caused by vortices and periodic wave forces, and the rotor shaft And it is possible to reduce the damage that can occur to the turbine body, such as a generator.

The main shaft 34 is installed between the diaphragms 32 so as to support the diaphragms 32 apart from each other, and one end of the main shaft 34 is fixed to the blade root portion 20. In addition, the main shaft 34 is coupled between the diaphragms 32 through the through holes of the blade block 31. In particular, the main shaft 34 is provided in front between all the diaphragms 32 so as to support the bending moment between all the diaphragms 32.

The auxiliary shaft 35 is installed between the diaphragms 32 so as to support the diaphragms 32 apart from each other, and is coupled between the diaphragms 32 through the through holes of the blade block 31. In addition, the auxiliary shaft 35 is provided at the rear side between the some diaphragms 32 so as to assist the bending moment between the some diaphragms 32.

The auxiliary wire 36 is installed between the edges of the diaphragm 32 so as to support the tension force between the diaphragms 32 and is coupled between the diaphragms 32 through the through holes of the blade block 31.

As shown in FIG. 4, the main shaft 34, the auxiliary shaft 35, and the auxiliary wire 36 have a bending moment when a bending deformation (indicated by a dotted line in the drawing) occurs in the blade length direction of the present embodiment. It will act as a steel frame to support it.

In particular, the main shaft 34 and the auxiliary shaft 35 has a function of primarily supporting the bending moment generated in the blade, and also serves to fix the diaphragm 32 installed between the blade blocks 31.

In addition, the cross section of the blade has an airfoil (airfoil) shape, the size and the torsion angle changes toward the blade tip portion (40). Accordingly, the main shaft 34 is positioned at a position that can be commonly penetrated to all blade cross sections, and the auxiliary shaft 35 is properly positioned according to the position of the cross section changed by the torsion angle.

In actual design, the feedback of the structural analysis results is fed back to select the optimum position of the auxiliary shaft 35 and to select the number of auxiliary shafts 35 that can withstand the torsional moment between the blade blocks 31. do.

An auxiliary wire 36 is installed at the edge of the diaphragm 32 provided between the blade blocks 31, and serves to support the tensile force generated on the outer surface of the blade, that is, the current incident surface when bending deformation occurs in the blade. . The compressive force generated on the opposite side of the blade is supported by the blade block 31.

The entire steel frame has a truss structure that can minimize its own weight and maximize its structural strength. The position of the main shaft 34 and the auxiliary shaft 35, the position of the diaphragm 32 between the blade blocks 31, the tension and elongation of the auxiliary wire 36, the strain and compressive strength of the shock absorber 33, the blade The compressive strength and strain of the block 31 are preferably designed to be optimally distributed when designing the overall blade structural strength.

The blade tip portion 40 is coupled to the outermost portion of the blade body portion 30 to form a blade tip.

Hereinafter, a method of manufacturing a rotor blade for a tidal current turbine according to an embodiment of the present invention with reference to the accompanying drawings in detail.

As shown in Figure 6, the manufacturing method of the rotor blade for tidal power turbine according to the present embodiment is the main shaft fixing step (S10), blade block coupling step (S20), shock absorber coupling step (S30), diaphragm installation and auxiliary Shaft, auxiliary wire fixing step (S40), repeated installation step (S50), the body portion and the hub portion joining step (S60), including a painting step (S70).

In the main shaft fixing step (S10) is fixed to one end of the main shaft 34 to the blade root portion 20 to form a main support for forming the blade body portion 30.

In the blade block coupling step (S20), the blade block 31 is inserted into the main shaft 34 fixed to the blade root portion 20 via a through hole.

In the shock absorber coupling step (S30), after the blade block 31 is coupled to the main shaft 34, the shock absorber 33 is inserted into the main shaft 34 to mitigate the impact between the blade blocks 31. .

In the diaphragm installation and the auxiliary shaft and the auxiliary wire fixing step (S40), after the blade block 31 and the shock absorber 33 are coupled to the main shaft 34, the diaphragm 32 is installed and fixed to the main shaft 34. One end of the auxiliary shaft 35 and the auxiliary wire 36 is fixed to the diaphragm 32.

In the repeating installation step (S50), after fixing the one end of the auxiliary shaft 35 and the auxiliary wire 36 to the diaphragm 32, the main shaft 34, the auxiliary shaft ( 35 and the auxiliary wire 36 are installed through the blade block 31, the shock absorbing material 33, and the diaphragm 32 are repeatedly coupled to the blade tip part 40 by the blade body part 30. Will form.

Body portion and hub portion coupling step (S60) after forming the blade body portion 30, the blade body portion 30 and the blade root portion 20 is symmetrically coupled to the blade hub portion 10 of the present embodiment This completes the rotor blades for the power turbine.

In the painting step (S70), since the blade is immersed in seawater during algae power generation on the rotor blade for algae power generation turbine, thus preventing algae growth and preventing corrosion of metal members. Prevention coating will be performed.

In particular, the metal frame such as the blade root portion 20 is applied to the coating coating of the improved grade, it is also possible to use marine steel with excellent corrosion resistance or to replace the non-metal material having the structural strength equivalent to the metal material Do.

As described above, according to the present invention, it is possible to mass-produce blades, to flexibly deform in the event of an unexpected impact of the ocean, to absorb a certain portion of instantaneous impact force, and to start at a low flow rate, thereby to lose energy conversion. , Corrosion resistance to be used in the marine environment is excellent, and the weight of the blade can be reduced to lower the initial speed of the rotor to expand the scope of the marine region where the tidal power is possible and expand the market size of the tidal power generation To provide.

The present invention described above can be embodied in many other forms without departing from the spirit or main features thereof. Therefore, the above embodiments are merely examples in all respects and should not be interpreted limitedly.

The present invention provides a rotor blade for an algae turbine and a method for manufacturing the same, which generate electric power using the flow of sea water.

Claims

A rotor hub coupled to the rotary shaft of the turbine;

A blade root portion symmetrically coupled to the rotor hub portion to support a blade;

A blade body portion in which a plurality of blade blocks are sequentially coupled to the blade root portion to form an airfoil shape of the blade; And

Rotor blades for tidal current turbine comprising a; blade tip portion coupled to the outermost portion of the blade body portion to form a blade tip.
The method of claim 1,

The blade body portion

A blade block having a plurality of blades sequentially coupled to one of the blade root portions;

Diaphragms coupled between the blade blocks;

An impact absorber coupled between the blade block and the diaphragm to absorb the impact between the blade blocks;

A main shaft and an auxiliary shaft installed between the diaphragms so as to support the diaphragm apart from each other and fixed to the blade root; And

Rotor blades for tidal power turbine, characterized in that consisting of; an auxiliary wire provided between the edge of the diaphragm to support the tension between the diaphragm.
The method of claim 2,

And the main shaft, the auxiliary shaft, and the auxiliary wire are coupled between the diaphragm through the blade block.
The method of claim 2,

The main shaft is installed in front of all the plates to support the bending moment between all the plates,

The auxiliary shaft is a rotor blade for a tidal power turbine, characterized in that it is installed in the rear between some of the diaphragm to support the bending moment between some of the diaphragm.
A method for manufacturing a rotor blade for a tidal power turbine according to claim 2,

Securing the main shaft to the blade root;

Inserting and coupling a blade block to the main shaft;

Inserting a shock absorber after coupling the blade block;

Installing a diaphragm on the main shaft and fixing an auxiliary shaft and an auxiliary wire;

Repeatedly installing the blade block up to the blade tip to complete the blade body;

Coupling the blade hub to the blade body after completing the blade body; And

A method of manufacturing a rotor blade for an algae turbine, comprising the steps of: performing algae growth preventing coating and metal corrosion preventing coating.