JP5774426B2 - Airflow generator, airflow generator manufacturing method, and wind power generation system - Google Patents

Description

  Embodiments described herein relate generally to an airflow generation device, a method for manufacturing the airflow generation device, and a wind power generation system.

  In the field of fluid engineering, an airflow generation device using a dielectric barrier type plasma actuator that generates an electric discharge on an object surface and controls aerodynamic characteristics in a fluid device has attracted attention. Such an air flow generation device improves the aerodynamic characteristics by the air flow generated by the action of the discharge plasma, so that vibrations and noise in fluid equipment can be suppressed, or high efficiency can be achieved. Application of wind power generation systems to wind turbine blades is expected.

  As such an airflow generation device using a dielectric barrier type plasma actuator, one having a configuration in which two electrodes of a discharge electrode and a counter electrode are arranged via a dielectric (insulator) is known. Yes. The airflow generation device having such a configuration is attached to the wind turbine blade of the wind power generation system, and a voltage is applied between the two electrodes, whereby the gas in the vicinity of the electrode is ionized to generate an airflow on the surface of the windmill blade.

JP 2007-317656 A JP 2008-25434 A

  Examples of the dielectric (insulator) used in the airflow generator include ceramic materials mainly composed of aluminum nitride, alumina, zirconia, and the like, and resin materials such as epoxy resin, fluororesin, and silicone resin. However, the airflow generator using these insulators has the following problems.

  The ceramic material has a strong resistance to electric discharge, but it is difficult to attach it to a wind turbine blade of a wind power generation system formed by a complicated curved surface because it has no elasticity. Even if an airflow generator using ceramic material as an insulator can be divided and attached to wind turbine blades, the wind turbine blades bend during rotation, so the inelastic ceramic material is damaged and stable discharge occurs. It is not possible to generate an airflow.

  On the other hand, resin materials are elastic and can be attached to wind turbine blades relatively easily. However, since the resistance to discharge is significantly lower than ceramic materials, the insulator deteriorates due to discharge, and stable discharge is generated. Can not generate a stable airflow. In addition, when the resin material is used outdoors, it cannot be used for a long time because it deteriorates due to ultraviolet irradiation or moisture absorption.

  The problem to be solved by the present invention is that it can be attached to a mounting surface having a curved surface, is not damaged by bending of the mounting surface, and has excellent resistance to discharge generated between electrodes. It is an object to provide an airflow generator that can be used for a long period of time, a method of manufacturing the airflow generator, and a wind power generation system.

One aspect of the airflow generation device includes an insulating base formed by impregnating mica paper with a water-repellent epoxy resin in which inorganic particles are dispersed and having water repellency, and curing the water-repellent epoxy resin; In a state where a part of the insulating substrate is interposed between the first electrode embedded in the body, the surface of the insulating substrate from the first electrode, and the first electrode. An air flow is generated by applying a voltage between the first electrode and the second electrode to generate a discharge.

One aspect of a method for producing an airflow generator is a step of forming a plurality of prepreg sheets in which mica paper impregnated with a water-repellent epoxy resin in which inorganic particles are dispersed and having water repellency is semi-cured by heating and drying. A plurality of the prepreg sheets are laminated to form a laminated body, and the first electrode is sandwiched between the prepreg sheets, and the first electrode is disposed on the surface side of the laminated body from the first electrode. A step of installing the second electrode with a part of the prepreg sheet interposed therebetween, and heating while pressing the laminate of the first electrode, the second electrode, and the prepreg sheet. And a step of integrating them.

  According to the present invention, it can be attached to a mounting surface having a curved surface, is not damaged by bending of the mounting surface, has excellent resistance to discharge generated between electrodes, and is used for a long time. can do.

The figure which shows the cross-sectional structure of the airflow generator which concerns on 1st Embodiment. The figure which shows the evaluation method of the partial discharge resistance of the insulator of an airflow generator. The figure which shows the cross-sectional structure of the airflow generator which concerns on 2nd Embodiment. The figure which shows the manufacturing method of the airflow generator which concerns on one Embodiment. The figure which shows an example of the attachment method to the windmill blade of the airflow generator which concerns on one Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram illustrating a cross-sectional configuration of an airflow generation device 10 according to the first embodiment. As shown in FIG. 1, the airflow generator 10 includes an insulating substrate 3 formed by impregnating mica paper 1 with an epoxy resin 2 and curing the epoxy resin 2. The first electrode 4 is embedded inside.

  Further, the second electrode 5 is provided on the insulating base 3 on the surface side of the first electrode 4 and with a part of the insulating base 3 interposed between the first electrode 4 and the second electrode 5. It is arranged. The surface of the second electrode 5 may be disposed in a state of being exposed to the outside, and the second electrode 5 is covered with a part of the insulating substrate 3, that is, the second electrode 5 is covered with the insulating substrate 3. It may be in a state embedded in the vicinity of the surface. The entire thickness of the airflow generation device 10 is, for example, about 0.5 mm to 1 mm. In FIG. 1, the thickness direction (with respect to the scale in the longitudinal direction (left-right direction in FIG. 1)) is illustrated in FIG. The scale in the vertical direction in FIG. 1 is schematically shown in an enlarged manner (the same applies to FIGS. 2 to 5 described later).

  In the airflow generation device 10 having the above-described configuration, a discharge can be generated by applying a voltage between the first electrode 4 and the second electrode 5 from a power source (not shown). An air stream can be generated by converting a part of the gas in the vicinity of the surface of the conductive substrate 3 into plasma.

  As the mica paper for constituting the insulating substrate 3, a paper-assembled mica can be used. As the laminated mica, for example, hard non-fired laminated mica and hard fired laminated mica can be used. In order to improve the mechanical strength, heat resistance, and impregnation properties of these laminated mica, it is possible to mix aromatic polyamide fibrids (short fibers) into laminated mica and make paper, or to use glass short fibers as laminated mica. You may mix and make paper.

  A reinforcing material may be used to increase the strength of the mica paper. The reinforcing material is not particularly limited as long as it can reinforce mica paper, and a glass cloth, a polymer film (polyester film, polyimide film, etc.), a polyester nonwoven fabric insulating sheet material can be used. .

  More specifically, for example, hard unfired aramid fiber mixed mica tape (KMF 805A ST, KMF 806E ST, KM 801A ST, KMF 805A STB, KMP 801A STB (all trade names)) manufactured by Nippon Rika Kogyo Co., Ltd., Hard Mica Tape (ZGB22HDT (trade name)) manufactured by Nippon Mica Manufacturing Co., Ltd., Hard Unfired Mica Tape (DL86-4C, DG86-TD1 (both trade names)) manufactured by Okabe Mica Kogyo Co., Ltd. A tape (DG86, DG88, DGL76 (all trade names)) or the like can be used.

  In addition, as the epoxy resin 2, for example, a water-repellent epoxy resin (Hydrophobic Cyclo Epoxy (HCEP) or Shed Hydrophobic Cycloaliphatic Epoxy (S-HCEP) (both trade names)) manufactured by Huntsman can be preferably used. .

  Moreover, you may combine a water repellent epoxy resin, another epoxy resin, and the hardening | curing agent for epoxy resins. Other epoxy resins include, for example, bisphenol A type epoxy resins, brominated bisphenol A type epoxy resins, hydrogenated bisphenol A type epoxy resins obtained by condensation of polychlorophenols such as epichlorohydrin with bisphenols and polyhydric alcohols. Bisphenol F type epoxy resin, bisphenol S type epoxy resin, bisphenol AF type epoxy resin, biphenyl type epoxy resin, naphthalene type epoxy resin, fluorene type epoxy resin, novolac type epoxy resin, phenol novolak type epoxy resin, orthocresol novolak type epoxy Glycidyl ether type epoxy resins such as resin, tris (hydroxyphenyl) methane type epoxy resin, tetraphenylolethane type epoxy resin, and epichlorohydrin Glycidyl Jijiru ester epoxy resins obtained by condensation of carboxylic acid, and heterocyclic epoxy resins such as hydantoin epoxy resin obtained by the reaction of triglycidyl isocyanate or epichlorohydrin with hydantoins can be used.

  Also, epoxy resin curing agents include diethylenetriamine, triethylenetetramine, metaxylylenediamine, isophoronediamine, 1,3-bisaminomethylcyclohexane, diaminodiphenylmethane, metaphenylenediamine, diaminodiphenylsulfone, dicyandiamide, organic acid dihydrazide, etc. Amine curing agent, phthalic anhydride, hexahydrophthalic anhydride, 4-methylhexahydrophthalic anhydride, tetrahydrophthalic anhydride, 4-methyltetrahydrophthalic anhydride, tetrabromophthalic anhydride, nadic anhydride, methyl nadic anhydride , Trimellitic anhydride, pyromellitic anhydride, head acid anhydride, methyl hymic anhydride, dodecenyl succinic anhydride, polyazelenic anhydride, benzophenone tetracarboxylic acid, etc. Curing agents, imidazole curing agents such as 2-methylimidazole, 2-ethyl-4-methylimidazole, 2-heptadecylimidazole, polymercaptan curing agents such as polysulfide and thioester, polyamide curing agents, phenolic curing agents, A Lewis acid curing agent or an isocyanate curing agent can be used. Further, in combination with an epoxy resin curing agent, an epoxy resin curing accelerator capable of accelerating or controlling the curing reaction of the epoxy resin may be used.

  Moreover, when impregnating mica paper with an epoxy resin, an organic solvent may be used to adjust the viscosity of the epoxy resin. Any organic solvent can be used as long as it is compatible with an epoxy resin and can reduce the viscosity to a desired value. Acetone, methyl ethyl ketone, toluene, xylene, methanol, ethanol, propyl alcohol, Be part of the skeleton of the cured product by having an organic solvent such as isopropyl alcohol, dimethylformamide, dimethyl sulfoxide, N-methyl-2-pyrrolidone, acetonitrile, methyl cellosolve, ethyl cellosolve, or having an epoxy group in the molecular skeleton. Can be used reactive diluents such as butyl glycidyl ether, alkylene monoglycidyl ether, alkylphenol monoglycidyl ether, polypropylene glycol diglycidyl ether, alkylene diglycidyl ether

  Moreover, the material which comprises the 1st electrode 4 and the 2nd electrode 5 should just be an electroconductive material, The material is not limited. Examples of materials constituting the first electrode 4 and the second electrode 5 include stainless steel, Inconel (trade name), Hastelloy (trade name), titanium, platinum, tungsten, molybdenum, nickel, copper, gold, silver, Metals such as tin, chromium, alloys containing these metal elements as main components, inorganic good conductors such as carbon nanotubes and conductive ceramics, and organic good conductors such as conductive plastics can be used.

  In addition, the first electrode 4 and the second electrode 5 can be embedded in the insulating base 3 made of mica paper 1 and epoxy resin 2 and the surface of the insulating base 3 or The shape is not limited as long as the shape can be installed in the vicinity of the surface, but a thin piece shape can be preferably used.

  Next, the results of an evaluation test of the insulating substrate 3 in the airflow generation device 10 having the above configuration will be described. In this evaluation test, an insulator sample A prepared by impregnating mica paper with an epoxy resin (bisphenol A-type epoxy resin) and heat-cured, and an epoxy resin (bisphenol A-type epoxy resin) are prepared by heat-curing. The partial discharge resistance of the comparative insulator sample B was evaluated.

  As shown in FIG. 2, the partial discharge resistance is such that after applying the conductive paint 22 to the back surface of the sample 21, the sample 21 is placed on the ground electrode 23, and the rod electrode 24 is 0.2 mm from the surface of the sample 21. Set with a gap. And the surface of the flat sample 21 was exposed to the partial discharge by applying the voltage of AC4 kVrms to the rod electrode 24. After applying electricity for 1440 hours, the depth of deterioration of the portion most deteriorated by discharge was measured.

The measurement result of this deterioration depth was as follows.
Insulator sample A: 15 μm
Insulator sample B: 210 μm

  As described above, it can be seen that in the insulator sample A, the depth of deterioration due to discharge is much smaller than that in the insulator sample B. In the insulator sample A, mica paper having excellent resistance to discharge is contained in the epoxy resin. Since the epoxy resin is an organic substance, the molecular chain of the epoxy resin is cut by discharge and the deterioration proceeds. However, in the insulator sample A, since the mica paper protects the epoxy resin that is weak against discharge, excellent partial discharge resistance is exhibited. In addition, although said evaluation result uses the normal bisphenol A type epoxy resin which is not water-repellent as an epoxy resin, the result evaluated about the case where water-repellent epoxy resin (made by Huntsman) is used is also the same. As a result.

  Next, a water-repellent epoxy resin insulator sample produced by heat-curing a water-repellent epoxy resin and an epoxy resin insulation produced by heat-curing a normal epoxy resin (bisphenol A type epoxy resin) that is not water-repellent Contact angles were measured on body samples. The contact angle was determined from a water droplet photograph of the sample surface taken from the side surface after dropping water droplets on the sample surface. The contact angle was measured in the same manner after irradiation with ultraviolet rays corresponding to 5000 hours in accordance with ISO 4892-3: 1994 (Plastics-Methods of exposure to laboratory light sources-Part 3: Fluorescent UV lamps).

The measurement result of the contact angle was as follows.
Water repellent epoxy resin insulator sample: 115 degrees (before UV irradiation), 105 degrees (after UV irradiation)
Normal epoxy resin insulator sample: 100 degrees (before UV irradiation), 70 degrees (after UV irradiation)

  As can be seen from the above measurement results, the water repellent epoxy resin insulator sample has a larger contact angle than the normal epoxy resin insulator sample. This means that the water repellent epoxy resin insulator sample exhibits excellent water repellency. In addition, when comparing the contact angle after UV irradiation, the surface of the normal epoxy resin insulator sample deteriorates due to UV light, and the contact angle is significantly reduced. It can be seen that the decrease in contact angle due to is small and excellent water repellency is maintained.

  In general, when an epoxy resin absorbs water, its insulating performance is lowered. On the other hand, insulator samples using water-repellent epoxy resins have excellent water repellency and little decrease in water repellency due to ultraviolet rays. Insulation performance can be maintained. For this reason, it is preferable to use a water-repellent epoxy resin.

  According to the present embodiment, since it is an insulator using a resin material, it can be attached to a mounting surface having a curved surface, and is not damaged by bending of the mounting surface, and is generated between electrodes. It has excellent resistance to long-term use.

  Next, a second embodiment will be described. In the air flow generation device 20 according to the second embodiment, as shown in FIG. 3, the mica paper 1 is impregnated with the epoxy resin 2 and the epoxy resin 2 is cured. In addition, the inorganic particles 6 are dispersed. The inorganic particles 6 are made of fine particles (fine powder) having a particle size of, for example, from the micron order to the nano order. Then, the first electrode 4 is embedded in the insulating base 3 in which the inorganic particles 6 are dispersed, and is closer to the surface of the insulating base 3 than the first electrode 4 and with the first electrode 4. The second electrode 5 is disposed with a part of the insulating substrate 3 interposed therebetween. In the lower part of FIG. 3, the state inside the insulating substrate 3 is schematically shown in an enlarged manner.

  As the inorganic particles 6, for example, fine particles made of clay, silica, alumina, titanium oxide, or the like, for example, fine particles having a nano-size particle size can be used, and these can be used alone or in combination of two or more. Can be used.

  Moreover, as said inorganic particle 6, what changed the interface with an epoxy resin by the silane coupling agent can be used.

  Specifically, the clay particles include Somasif ME-100, ME, MAE, Smectite SWN, STN, SEN (all trade names) manufactured by Co-op Chemical Co., Ltd., Kunipia F (trade names) manufactured by Kunimine Industries, Ltd., Hojun Purified bentonite (Bengel series: Wenger W-100U, Wenger W-200U, Wenger W-300U, Wenger W-300HP, etc. (all are trade names)), Hojoen's organic bentonite (S Ben Series: Esven, Esben C, Esben E, Esben W, Esben WX, etc. Organite Series: Organite, Organite D, Organite T, etc. (all trade names)), Cloisite series manufactured by Southern Clay Products ( Cloisite Na, Cl oisite 30B, Cloite 10A, Cloite 25A, Cloite 20A, Cloite 15A, Cloite 6A (all are trade names)) can be used.

  In addition, for clays that are not organically modified, such as Somasif ME-100, smectite SWN, purified bentonite, and Cloisite Na, it is possible to impart affinity to the epoxy resin by inserting various organic compounds between the clay layers. it can. As the organic compound that can be inserted between the clay layers, alkylamine salts and quaternary ammonium salts are desirable, and as the alkylamine salts, primary to tertiary alkylamine salts can be used, Examples of the alkylamine salt include octylamine salt, laurylamine salt, myristylamine salt, stearylamine salt, cocoalkylamine salt, beef tallow alkylamine salt, cured beef tallow alkylamine salt, oleylamine salt, and cured beef tallow alkylamine salt. Examples of secondary alkylamine salts include dicoco alkylamine salts and di-cured tallow alkylamine salts. Examples of tertiary alkylamine salts include N, N-dimethyllaurylamine salts, N, N-dimethylmyristylamine salts, N, N-dimethylpalmitylamine salt, N, N-dimethylstearylamine N, N-dimethylbehenylamine salt, N, N-dimethylcocoalkylamine salt, N, N-dimethyl beef tallow alkylamine salt, N, N-dimethyl-cured tallow alkylamine salt, N, N-dimethyloleylamine salt, N -Methyl didecyl amine salt, N-methyl dicoco alkyl amine salt, N-methyl hydrogenated beef tallow alkyl amine salt, N-methyl dioleyl amine salt, etc. are mentioned, and these alkyl amine salts are used alone or as a mixture of two or more. Can be used. As quaternary ammonium salts, tetrabutylammonium salt, tetrahexylammonium salt, dihexyldimethylammonium salt, dioctyldimethylammonium salt, hexatrimethylammonium salt, octatrimethylammonium salt, dodecyltrimethylammonium salt, hexadecyltrimethylammonium salt, stearyl Trimethylammonium salt, dococenyltrimethylammonium salt, cetyltrimethylammonium salt, cetyltriethylammonium salt, hexadecylammonium salt, tetradecyldimethylbenzylammonium salt, stearyldimethylbenzylammonium salt, dioleyldimethylammonium salt, N-methyldiethanollauryl Ammonium salt, dipropanol monomethyl lauryl ammonium Dimethyl monoethanol lauryl ammonium salt, polyoxyethylene dodecyl monomethyl ammonium salt, dimethyl hexadecyl octadecyl ammonium salt, trioctyl methyl ammonium salt, tetramethyl ammonium salt, tetrapropyl ammonium salt, etc., or a mixture of two or more kinds Can be used as

As the silica particles, Aerosil series (AEROSIL 90, AEROSIL 130, AEROSIL 150, AEROSIL 200, AEROSIL 300, AEROSIL OX, AEROSIL TT, AEROSIL 200SP, AEROSIL RSP2, AEROSIL R104, AEROSILOS R805, AEROSIL R7200, etc. (all are trade names), NanoSilica 999 (trade name) manufactured by Elchem Japan Co., Ltd., Admafine series (SO-E1, SO-E2, SO-C1, SO-C2, etc.) manufactured by Admatech (Both are trade names)) NanoTek SiO ₂ (trade name) manufactured by CI Kasei Co., Ltd. can be used.

As the alumina particles, Aerooxide series (AEROXIDE Alu C, AEROXIDE Alu 65, AEROXIDE Alu 130 (all are trade names)) manufactured by Nippon Aerosil Co., Ltd., and Admafine Series (AO-802, AO-502 manufactured by Admatech) Also, NanoTek Al ₂ O ₃ (trade name) manufactured by CI Kasei Co., Ltd. can be used.

As the titanium oxide particles, Aeroxide series (AEROXIDE TiO ₂ P25, AEROXIDE TiO ₂ PF2 (both trade names) manufactured by Nippon Aerosil Co., Ltd., NanoTek TiO ₂ manufactured by CI Kasei Co. _, Ltd., MT series manufactured by Teika (MT-01) , MT-100S, MT-100TV, MT-100SA, MT-100HD, MT-300HD, MT-500HD, MT-500B, etc. (all trade names)).

  As a coupling agent used for the purpose of modifying the surface of the inorganic particles and improving the adhesion between the epoxy resin and the inorganic particles, or suppressing the re-aggregation of the dispersed inorganic particles in the epoxy resin, γ- Silane coupling agents such as glycidoxy-propyltrimethoxysilane, γ-aminopropyl-trimethoxysilane, vinyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-glycidyloxypropyl-trimethoxysilane, titanate coupling Agents and aluminum coupling agents can be used, and these coupling agents can be used alone or as a mixture of two or more.

Next, the results of evaluating the effects and effects of the inorganic particles 6 will be described. After stirring added an epoxy resin silica particles (Nippon Aerosil Co., Ltd. AEROSIL 200), and the insulator samples _{A 1} prepared by heat curing, the epoxy resin to silica particles (Nippon Aerosil Co., Ltd. AEROSIL 200) and silane coupling An insulator sample A ₂ prepared by adding a ring agent (γ-glycidoxy-propyltrimethoxysilane) and stirring, followed by heat curing, silica nanoparticles (AEROSIL 200 manufactured by Nippon Aerosil Co., Ltd.), and a silane coupling agent (γ - glycidoxy - stirred with propyl trimethoxysilane), and the insulator samples a ₃ prepared by heating curing the impregnated mica paper with dispersed epoxy resin contains no silica particles, simply thermally cured epoxy resin Partial discharge resistance of insulator sample B produced by It was evaluated. The evaluation method is the same as the above-described evaluation method shown in FIG.

As a result of the evaluation of the partial discharge resistance, the deterioration depth of each of the insulator samples A1, A2, A3, and B was as follows.
Insulator sample A ₁ : 75 μm
Insulator sample A ₂ : 25 μm
Insulator sample A ₃ : 5 μm
Insulator sample B: 210 μm

As described above, compared to the insulator sample B that does not include inorganic particles, the insulator samples A ₁ , A ₂ , and A ₃ that include silica nanoparticles have a very small deterioration depth due to discharge. This is because silica nanoparticles having excellent resistance to discharge are densely dispersed in the epoxy resin.

  That is, since the epoxy resin is an organic substance, the molecular chain of the epoxy resin is cut by discharge and the deterioration proceeds. However, when silica nanoparticles are densely dispersed in the epoxy resin, the silica nanoparticles protect the epoxy resin that is weak against discharge, so the partial discharge resistance is improved compared to when silica nanoparticles are not included. To do.

In addition, in the insulator sample A ₂ and the insulator sample A ₃ containing the silane coupling agent in addition to the silica nanoparticles, the deterioration depth due to the discharge is smaller than that of the insulator sample A ₁ not containing the silane coupling agent. It has become. This is because the silane coupling agent improves the adhesion between the silica nanoparticles and the epoxy resin, so that the protective effect of the silica nanoparticles is increased.

Furthermore, stirred with silica nanoparticles and silane coupling agent, the insulator samples A ₃ was prepared by a dispersed epoxy resin cured by heating to impregnate the mica paper, the depth deterioration due to the discharge as compared with other samples of Is the smallest. This is due to the protection effect of epoxy resin by mica paper and the protection effect of silica nanoparticles whose adhesion to the epoxy resin is improved by silane coupling agent. This is because it can be done.

  As described above, an air flow generator having excellent resistance to discharge by dispersing inorganic particles such as silica nanoparticles in an epoxy resin and further modifying the surface of the inorganic particles with a silane coupling agent or the like. Can be used for a long time.

  According to the present embodiment, the insulating base formed by impregnating mica paper with an epoxy resin and curing the epoxy resin can be attached to a mounting surface having a curved surface, and the mounting It does not break due to surface deflection, has excellent resistance to discharge generated between the electrodes, and can be used for a long time.

  Next, with reference to FIG. 4, the manufacturing method of the airflow generator which concerns on one Embodiment is demonstrated.

  In the manufacturing method of the airflow generation device according to the present embodiment, first, mica paper impregnated with an epoxy resin is bonded together by causing the epoxy resin to act as an adhesive, and then heated and dried to be in a semi-cured state (B stage A plurality of prepreg sheets 41 in a state) are formed. In addition, you may use the prepreg sheet 41 which made one mica paper impregnated with an epoxy resin semi-hardened by heat drying, without bonding a plurality of mica paper impregnated with an epoxy resin.

  Next, as shown in FIG. 4A, the prepreg sheet 41 is laminated, the first electrode 42 is sandwiched between the prepreg sheets 41, and the first electrode 42 of the laminated body is placed on the surface side. The second electrode 43 is installed with a part of the prepreg sheet 41 interposed between the first electrode 42 and the first electrode 42. FIG. 4A shows the case where the second electrode 43 is installed so as to be exposed on the surface, but a state in which a part of the second electrode 43 is covered with the prepreg sheet 41 is shown. Also good.

  Thereafter, as shown in FIG. 4 (b), the laminated body in which the prepreg sheet 41, the first electrode 42, and the second electrode 43 are laminated is sandwiched between the hot plates 44 from both sides and heated while being pressed. Then, the laminated body is integrated, and the airflow generation device 40 is manufactured. In this heating, for example, after heating from room temperature to 100 ° C., it is finally heated to about 150 ° C. and heated for about 10 hours. In this case, the heating from room temperature to 100 ° C. is preferably performed in a reduced pressure atmosphere. Thus, by heating in a reduced pressure atmosphere, air or the like contained in the epoxy resin can be discharged.

  The total thickness of the airflow generation device 40 is preferably about 0.5 mm to 1 mm, for example. For this reason, for example, when the thickness of mica paper is about 0.1 mm, it is preferable to laminate several mica papers (for example, 3 sheets) to about 10 sheets as the airflow generation device 40 as a whole. It is preferable to stack approximately 9 sheets (for example, 7 sheets).

  Epoxy resins are liquid or solid at room temperature. For this reason, in order to embed the first electrode 42 and the second electrode 43 in an insulating base made of epoxy resin, or to place the first electrode 42 and the second electrode 43 on the surface of the insulating base, the first electrode 42 is placed in a container such as a mold. After the 42 and the second electrode 43 are installed, it is necessary to heat the liquid epoxy resin or the solid epoxy resin to form a liquid and flow into the container, and then heat and cure, which makes the manufacturing process very complicated. .

  On the other hand, in this embodiment, mica paper impregnated with an epoxy resin is bonded to the epoxy resin as an adhesive, and then a prepreg sheet 41 that is semi-cured by heating and drying is used. This eliminates the need for a mold (container) for pouring the epoxy resin, thereby simplifying the manufacturing process. That is, the first electrode 42 is sandwiched between the prepreg sheets 41, the second electrode 43 is installed on the surface of the prepreg sheet 41, and the first electrode 42, the second electrode 43, and the prepreg sheet 41 are connected to the hot plate The airflow generator 40 can be manufactured simply by heating while pressing at 44.

  Next, an example of a method for attaching the airflow generation device according to the embodiment to the wind turbine blade will be described with reference to FIG. In FIG. 5, reference numeral 50 denotes a part of a wind turbine blade of a wind turbine of the wind power generation system. In the wind power generation system, the wind turbine having the wind turbine blade 50 rotates to generate power.

  As shown in FIG. 5A, the prepreg sheet 51, the first electrode 52, and the second electrode 53 are stacked on the surface of the wind turbine blade 50, and thereafter, as shown in FIG. 5B. The airflow generator 55 is attached to the surface of the wind turbine blade 50 by heating the laminated body of the prepreg sheet 51, the first electrode 52, and the second electrode 53 while pressing with a hot plate 54 having a curved surface. It is done. The configuration of the airflow generation device 55 may be the configuration shown in FIG. 1 or the configuration shown in FIG. The prepreg sheet 51 is a mica paper impregnated with an epoxy resin, or a laminate obtained by bonding the mica paper with an epoxy resin acting as an adhesive, and a semi-cured state (B stage state) by heat drying. It is a thing.

  Since the wind turbine blade 50 of the wind power generation system is formed by a curved surface, it is difficult to install a container (enclosure) for pouring epoxy resin on the surface of the wind turbine blade 50. Therefore, after the prepreg sheet 51, the first electrode 52, and the second electrode 53 are installed on the surface of the windmill blade 50, the windmill formed by a curved surface is heated while being pressed by a hot plate 54 having a curved surface. The airflow generator 55 can be easily attached to the blade 50.

  As described above, since the insulator is made of a resin material, it can be easily attached to a wind turbine blade of a wind power generation system having a curved surface, and is not damaged by the deflection of the wind turbine blade during rotation. In addition, it has excellent resistance to discharge generated between the electrodes, and can be used outdoors for a long time.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Mica paper, 2 ... Epoxy resin, 3 ... Insulating base | substrate, 4 ... 1st electrode, 5 ... 2nd electrode, 10 ... Airflow generator.

Claims (7)

An insulating substrate formed by impregnating mica paper with a water-repellent epoxy resin in which inorganic particles are dispersed and having water repellency, and curing the water-repellent epoxy resin;
A first electrode embedded in the insulating substrate;
A second electrode disposed closer to the surface of the insulating substrate than the first electrode and with a portion of the insulating substrate interposed between the first electrode and the first electrode. And
An airflow generation device characterized by generating an airflow by applying a voltage between the first electrode and the second electrode to generate a discharge. Wherein the inorganic particles are clays, silica, alumina, Ri such scolded one of titanium oxide, the airflow generating device according to claim 1, wherein that the particle diameter of the fine powder of nano-order from micron order. The airflow generation device according to claim 2 , wherein the surface of the inorganic particles is modified with a silane coupling agent. Forming a plurality of prepreg sheets in which inorganic particles are dispersed and mica paper impregnated with water-repellent epoxy resin having water repellency , and semi-cured by heat drying;
A plurality of the prepreg sheets are laminated to form a laminate, the first electrode is sandwiched between the prepreg sheets, and the first electrode and the first electrode of the laminate are disposed on the surface side. A step of installing the second electrode with a part of the prepreg sheet interposed therebetween,
And a step of heating and integrating the laminated body of the first electrode, the second electrode, and the prepreg sheet. 5. The method of manufacturing an airflow generating device according to claim 4 , wherein the prepreg sheet is formed by bonding mica paper impregnated with a water-repellent epoxy resin in which a plurality of inorganic particles are dispersed and water-repellent . A wind power generation system comprising a windmill having windmill blades and generating power by rotating the windmill,
A wind power generation system, wherein the airflow generation device according to any one of claims 1 to 3 is disposed on a surface of the wind turbine blade. A plurality of prepreg sheets in which mica paper impregnated with a water-repellent epoxy resin in which inorganic particles are dispersed and water-repellent is made semi-cured by heating and drying, the first electrode, and the second electrode The wind power generation system according to claim 6 , wherein the airflow generation device is attached to the surface of the windmill blade by being heated while pressing after being installed on the surface of the windmill blade.

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