JP2012043728A - Heat generation device and wind-force thermal power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat generation device advantageous for weight saving, and a wind-force thermal power generation system including the heat generation device as a component.SOLUTION: A heat generation device 30 includes: rotors 31 which are composed of laminated ferromagnetic plates, have a circular arc shape in a cross section perpendicular to a direction of an axis 34, and are rotatable about the axis 34; a yoke 32 which is disposed on the outer peripheral side of the rotors 31 and is made of a ferromagnetic material; and current paths 33U and 33D extending along the axis 34, in between the rotors 31 and the yoke 32.

Description

  The present invention relates to a heat generator and a wind power generation system, and more particularly to a heat generator using heat generated by eddy current and a wind power generation system including the heat generator as a component.

  As a device for converting rotational energy into heat energy, a heat generating device using heat generated by eddy current is known. Specifically, for example, a permanent magnet type eddy current heating device has been proposed in which a magnetic field is changed by rotating a rotor having a permanent magnet disposed on the outer periphery, and heat is generated by the obtained eddy current (for example, Patent Documents). 1).

JP 2005-174801 A

  However, the heat generator that forms a magnetic field with a permanent magnet has a problem that the mass increases. In addition, when it is necessary to increase the size of the heat generator, a large permanent magnet corresponding to this is required, but there is a limit to increasing the size of the permanent magnet.

  The present invention has been made to cope with such problems, and an object of the present invention is to provide a heat generator advantageous for weight reduction and a wind power generation system including the heat generator as a component. .

  A heat generator according to the present invention comprises a laminated ferromagnetic plate, has a circular arc shape in a cross section perpendicular to the axial direction, and can rotate around the axis, and the outer peripheral side of the rotor And a yoke made of a ferromagnetic material and a current path extending along the axial direction between the rotor and the yoke.

  In the heat generator of the present invention, the rotor rotates while current is passed through the current path. This forms a magnetic path through the rotor and yoke. Further, the magnetic field at each location changes as the rotor rotates. At this time, since the rotor is composed of laminated plates, eddy currents caused by changes in the magnetic field are hardly generated in the rotor. On the other hand, in a yoke made of a (bulk-like) ferromagnetic material, an eddy current is generated due to the change in the magnetic field and generates heat. Thus, the heat generator of the present invention functions. In the heat generator of the present invention, it is easy to simplify the structure. Therefore, in the heat generator of this invention, the heat generator advantageous to weight reduction can be provided.

  In the above heat generator, the yoke may have a cylindrical shape. In this case, the heat generator includes at least one pair of current paths, and currents in opposite directions flow through the pair of current paths. By doing so, it becomes easy to obtain sufficient heat generation while maintaining a simple structure.

  In the heat generator, two or more pairs of current paths may be provided, and currents in opposite directions may flow in current paths adjacent to each other in the circumferential direction of the yoke. By doing so, it is possible to reduce the thickness of the yoke and the rotor, and it becomes easier to reduce the weight of the heat generator.

  In the above heat generator, a plurality of yokes may be arranged along the circumferential direction of the rotor. This makes it easy to obtain sufficient heat generation while maintaining a simple structure, as in the case of adopting a cylindrical shape as the yoke.

  In the heat generator, a concave portion is formed on a surface of the yoke facing the rotor, and a current path may be arranged so as to pass through the concave portion. By adopting such a structure, the arrangement of current paths in the heat generator is facilitated.

  The heat generator may include a plurality of rotors, and the plurality of rotors may be rotatable on a single annular track. By doing in this way, heat_generation | fever can be efficiently implement | achieved in a heat generating machine.

  In the heat generator, the distance between the outer peripheral surface of the rotor and the inner peripheral surface of the yoke may be different in the circumferential direction of the rotor. By appropriately setting the distance, it is possible to realize a state in which the magnetic field in each part of the yoke continues to change as the rotor rotates, and the utilization efficiency of the material (yoke) is improved.

  A wind thermal power generation system according to the present invention includes a windmill, a heat generator that is connected to the windmill and generates heat by rotation of the windmill, a heat storage section that is connected to the heat generator and stores heat generated in the heat generator, and a heat storage section. And a power generation unit that converts heat stored in the heat storage unit into electricity. The heat generator is the heat generator of the present invention, and the rotor is rotated by the rotation of the windmill.

  In the wind thermal power generation system of the present invention, the heat generator of the present invention having a structure advantageous for weight reduction is adopted as the heat generator. Therefore, for example, even when the heat generator is housed in the machine room (nacelle) behind the wind turbine and the wind turbine and the nacelle are supported by the tower, the mass to be supported by the tower can be suppressed.

  As is apparent from the above description, according to the heat generator and the wind power generation system of the present invention, it is possible to provide a heat generator that is advantageous for weight reduction and a wind power generation system including the heat generator as a component.

It is the schematic which shows the structure of a wind thermal power generation system. FIG. 3 is a schematic diagram showing components of a heat generator in Embodiment 1. 2 is a schematic diagram illustrating a structure of a heat generator in Embodiment 1. FIG. 2 is a schematic cross-sectional view showing the structure of a heat generator in Embodiment 1. FIG. It is the schematic for demonstrating operation | movement of a heat generating machine. It is the schematic for demonstrating operation | movement of a heat generating machine. It is the schematic for demonstrating operation | movement of a heat generating machine. It is the schematic for demonstrating operation | movement of a heat generating machine. It is a diagram showing changes of the magnetic field at P ₁ in FIG. It is a diagram showing changes of the magnetic field at P ₂ in FIG. 6 is a schematic cross-sectional view showing a structure of a heat generator in Embodiment 2. FIG. FIG. 6 is a schematic diagram showing a structure of a heat generator in a third embodiment. FIG. 6 is a schematic diagram showing a structure of a heat generator in a fourth embodiment. FIG. 10 is a schematic cross-sectional view showing a structure of a heat generator in a fifth embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
First, Embodiment 1 which is one embodiment of the present invention will be described. Referring to FIG. 1, wind power generation system 1 in the present embodiment is connected to wind turbine 10, heat generator 30 that is connected to wind turbine 10 and generates heat by rotation of wind turbine 10, and is connected to heat generator 30. The heat storage part 40 which stores the heat which generate | occur | produced in 30 and the electric power generation part 50 which is connected to the heat storage part 40 and converts the heat stored in the heat storage part 40 into electricity are provided. The windmill 10 includes a main shaft 11 and a blade 12 that protrudes in the radial direction from the main shaft 11 and rotates the main shaft 11 in the circumferential direction by receiving wind. The heat generator 30 is connected to the main shaft 11 of the windmill 10 and generates heat by the rotation of the main shaft 11. Further, the heat generator 30 is housed in a nacelle 20 disposed adjacent to the rear of the windmill 10. The windmill 10 and the nacelle 20 are arranged on the tower 81 via the rotation support portion 21.

  The heat storage unit 40 is connected to the heat generator 30 via pipes 91, 96, and 97, and holds a fluid as a heat medium heated in the heat generator 30. Various fluids can be employed as the fluid as the heat medium, but water is employed as an example of the present embodiment. The power generation unit 50 includes a steam turbine 51 and a generator 52 that generates power by the rotation of the steam turbine 51. The steam turbine 51 is connected to the heat storage unit 40 by a pipe 92 and is rotated by water vapor supplied through the pipe 92. The rotation is transmitted to the generator 52 and used for power generation.

  The wind thermal power generation system 1 further includes a condenser 60 and pumps 71 and 72. The condenser 60 is connected to the steam turbine 51 by a pipe 93. The steam that has passed through the steam turbine 51 is supplied to the condenser 60 via the pipe 93, and the steam is returned to liquid water in the condenser 60. A pipe 61 and a pipe 62 are connected to the condenser 60. The condenser 60 is supplied with cooling water for cooling the water vapor and returning it to the water through the pipe 61, and is discharged through the pipe 62. The pump 71 is connected to the condenser 60 by a pipe 94 and is connected to the heat storage unit 40 by a pipe 95. The pump 72 is connected to the heat storage unit 40 by a pipe 96 and is connected to the heat generator 30 accommodated in the nacelle 20 on the tower 81 by a pipe 97. The heat storage unit 40, the power generation unit 50, and the condenser 60 are disposed in the power generation chamber 82.

  Next, the operation of the wind thermal power generation system 1 will be described. Referring to FIG. 1, when blade 12 receives wind, main shaft 11 rotates about the axis. The rotation of the main shaft 11 is converted into heat in the heat generator 30 in the nacelle 20. The heat generated in the heat generator 30 is used to heat water as a heat medium. Then, the heated water becomes water vapor and reaches the heat storage unit 40 through the pipe 91. And the said water vapor | steam is stored in the thermal storage part 40 in the state of high temperature and a high voltage | pressure.

  The water vapor stored in the heat storage unit 40 is supplied to the steam turbine 51 via the pipe 92 and the steam turbine 51 rotates. Then, the rotation of the steam turbine 51 is converted into electricity in the generator 52, and power generation is achieved.

  The steam used to rotate the steam turbine 51 reaches the condenser 60 through the pipe 93. In the condenser 60, the water vapor is cooled and returned to liquid water. This water is sent to the pump 71 through the pipe 94. Then, the pump 71 returns the water to the heat storage unit 40 through the pipe 95. On the other hand, the water in the heat storage unit 40 is sent to the pump 72 through the pipe 96. The pump 72 supplies water to the heat generator 30 through the pipe 97. That is, circulation of water that enters the heat storage unit 40 from the heat generator 30 and returns from the heat storage unit 40 to the heat generator 30, and circulation of water that returns from the heat storage unit 40 to the heat storage unit 40 through the steam turbine 51 and the condenser 60. Is formed. In this way, water as a heat medium circulates in the wind power generation system 1.

  In the wind thermal power generation system 1, the rotational energy of the windmill 10 can be converted into thermal energy and accumulated, and power can be generated using the thermal energy as necessary. Therefore, it is possible to omit an expensive power storage device that is necessary in a wind power generation system that directly converts the rotational energy of the windmill 10 into electric energy. Moreover, in the wind thermal power generation system 1 in this Embodiment, the heat generator of this invention with easy weight reduction including the heat generator in this Embodiment mentioned later is employ | adopted. Therefore, the mass (the mass of the nacelle 20 including the wind turbine 10 and the heat generator 30) to be supported by a tower (not shown) can be suppressed.

  Next, the heat generator 30 in this Embodiment accommodated in the nacelle 20 is demonstrated with reference to FIGS. The heat generator 30 in the present embodiment is composed of laminated ferromagnetic plates, has a circular arc shape in a cross section perpendicular to the direction of the axis 34, and can rotate around the axis 34, and the rotor A yoke 32 made of a ferromagnetic material and current paths 33U and 33D extending along the direction of the axis 34 between the rotor 31 and the yoke 32 are provided. Moreover, the piping 36 is arrange | positioned so that the outer peripheral surface of the yoke 32 may be contacted (refer FIG. 3). The inlet 36A of the pipe 36 is connected to the pipe 97 of FIG. 1, and the outlet 36B is connected to the pipe 91 of FIG. As a result, water as a heat medium moves along the direction of the arrow in FIG.

Here, the operation of the heat generator 30 will be described. From the stationary state shown in FIG. 5, the rotor 31 rotates around the shaft 34 as shown in FIGS. 6 to 8 and in the direction of the arrow α in FIG. 2 (in the current path 33U of FIGS. 5 to 8). When a current is applied (from the front side to the back side), a magnetic path is formed, and a magnetic field that changes as indicated by the arrows in FIGS. 6 to 8 is generated. Here, the direction of the hollow arrow in FIGS. 6 to 8 indicates the direction of the magnetic field, and the thickness of the arrow indicates the magnitude of the magnetic field. At this time, the magnetic fields at locations P ₁ and P ₂ in FIG. 6 change as shown in FIGS. 9 and 10, respectively. In FIG. 9, the region where the strength of the magnetic field is constant is formed because the magnetic field is saturated. Of course, when a current that does not saturate the magnetic field is passed through the current path 33U and the current path 33D, a peak is formed in the region. On the other hand, the maximum value of the magnetic field strength at the location P ₂ is smaller than the maximum value of the magnetic field strength at the location P ₁ is compared with the length of the magnetic path length of the magnetic path passing through the location P ₂ passes through a location P ₁ Because it is big.

  At this time, the rotor 31 is made of a laminated plate. Therefore, almost no eddy current is generated in the rotor 31 due to the change of the magnetic field. On the other hand, in the yoke 32 made of a bulk ferromagnetic material, an eddy current is generated due to the change in the magnetic field and generates heat. And the water in the piping 36 (refer FIG. 3) is heated with the heat | fever generate | occur | produced in the yoke 32, and is accumulate | stored in the thermal storage part 40 via the piping 91 (refer FIG. 1).

  Here, according to the heat generator 30 in the present embodiment, a simple structure as described above can be employed. Therefore, the heat generator 30 in the present embodiment is a heat generator advantageous for weight reduction.

  Moreover, in the heat generator 30 in this Embodiment, the yoke 32 has a cylindrical shape. Further, the inner peripheral surface of the yoke 32 in a cross section perpendicular to the shaft 34 has a circular shape. The heat generator 30 includes a pair of current paths (current path 33U and current path 33D). With reference to FIGS. 2 to 4, the pair of current paths 33U and 33D have currents in opposite directions. Flowing. More specifically, the pair of current paths 33U and 33D are arranged so as to face each other with the shaft 34 interposed therebetween, and are connected in the radial direction of the yoke 32 at both ends. As a result, the pair of current paths 33U and 33D constitutes a coil disposed on the inner peripheral side of the yoke 32. By doing in this way, it becomes easy for the heat generator 30 in this Embodiment to obtain sufficient heat generation, maintaining a simple structure.

  Furthermore, although not an essential structure in the present invention, in the heat generator 30 of the present embodiment, referring to FIG. 4, a recess 32 </ b> A is formed on the surface of the yoke 32 that faces the rotor 31. ing. A current path 33U and a current path 33D are arranged so as to pass through the recess 32A (along the recess 32A). By adopting such a structure, the arrangement of the current path 33U and the current path 33D in the heat generator 30 is facilitated.

  Further, in the heat generator of the present invention, the number of rotors may be one, but the heat generator 30 of the present embodiment has a plurality of rotations (specifically, for example, two as shown in FIGS. 2 to 4). A child 31 is provided. The plurality of rotors 31 can rotate on an annular single track. By doing in this way, heat_generation | fever can be efficiently implement | achieved in a heat generating machine.

(Embodiment 2)
Next, Embodiment 2 which is another embodiment of the present invention will be described. The heat generator 30 and the wind thermal power generation system 1 according to the second embodiment basically have the same structure as that of the first embodiment, operate in the same manner, and achieve the same effects. However, the heat generator 30 according to the second embodiment is different from the first embodiment in the configuration of the rotor, the yoke, and the current path.

  That is, referring to FIG. 11, the heat generator 30 of the second embodiment includes two or more pairs (two pairs in the present embodiment) of current paths (a pair of a current path 33U and a current path 33L, and a current path 33D and a current). In the current paths adjacent to each other in the circumferential direction of the yoke 32, currents in opposite directions flow. More specifically, for example, in the current path 33U and the current path D, a current flows from the front to the back of the paper, and in the current path 33L and the current path 33R, a current flows from the back of the paper to the front. The yoke 32 is formed with a recess 32A corresponding to each of the current paths 33U, 33L, 33D, 33R. Further, the heat generator 30 includes four rotors 31 arranged at equal intervals in the circumferential direction. By adopting such a structure, in the heat generator 30 in the present embodiment, the yoke 32 and the rotor 31 can be thinned, and the heat generator 30 can be further reduced in weight.

(Embodiment 3)
Next, Embodiment 3 which is still another embodiment of the present invention will be described. The heat generator 30 and the wind thermal power generation system 1 according to the third embodiment basically have the same structure as that of the first embodiment, operate in the same manner, and achieve the same effects. However, the heat generator 30 according to the third embodiment is different from the first embodiment in the configuration of the yoke 32.

That is, referring to FIG. 12, in the heat generator 30 of the present embodiment, the distance between the outer peripheral surface of the rotor 31 and the inner peripheral surface of the yoke 32 is different in the circumferential direction of the rotor 31. More specifically, the distance between the outer peripheral surface of the rotor 31 and the inner peripheral surface of the yoke 32 is the largest at the position where the current path 33U is disposed, and the distances g ₁ and g ₂ increase as the distance from the current path 33U increases. It is getting smaller. By doing so, in the present embodiment, the difference in magnetic resistance between the magnetic path β and the magnetic path γ is small, and preferably the magnetic resistance between the magnetic path β and the magnetic path γ is the same. As a result, it is possible to realize a state in which the magnetic field in each part of the yoke 32 continues to change as the rotor 31 rotates, and the utilization efficiency of the material (yoke 32) is improved. Note that. The distance between the outer peripheral surface of the rotor 31 and the inner peripheral surface of the yoke 32 is adjusted, for example, while the outer peripheral surface of the rotor 31 in a cross section perpendicular to the shaft 34 has an arc shape, while the inner peripheral surface of the yoke 32 is adjusted. Can be achieved by forming an elliptical arc shape in the vicinity of the current path 33U.

(Embodiment 4)
Next, a fourth embodiment which is still another embodiment of the present invention will be described. The heat generator 30 and the wind thermal power generation system 1 according to the fourth embodiment basically have the same structure as that of the first embodiment and operate in the same manner. However, the heat generator 30 in the fourth embodiment is different from that in the first embodiment in the configuration of the current path.

  That is, referring to FIG. 13, each of current path 33 </ b> U and current path 33 </ b> D includes an extending portion that extends on the inner peripheral surface side and the outer peripheral surface side with the side wall of yoke 32 interposed therebetween, and the extending portion. The separate coil provided with the connection part which connects these edge parts is comprised. Each of the current path 33U and the current path 33D constitutes an extending portion that extends on the inner peripheral surface side. That is, the current path 33U and the current path 33D are part of different coils. By adopting such a structure, similar to the heat generator 30 in the first embodiment, the heat generator 30 in the present embodiment can easily obtain sufficient heat generation while maintaining a simple structure. Yes.

(Embodiment 5)
Next, Embodiment 5 which is still another embodiment of the present invention will be described. The heat generator 30 and the wind thermal power generation system 1 according to the fifth embodiment basically have the same structure as that of the first embodiment and operate in the same manner. However, the heat generator 30 in the fifth embodiment differs from the first embodiment in the configuration of the yoke 32.

  That is, referring to FIG. 14, in heat generator 30 in the present embodiment, a plurality (two in this case) of yokes 32 are arranged along the circumferential direction of rotor 31. By adopting such a structure, the heat generator 30 in the present embodiment is sufficient while maintaining a simple structure as in the case of the first embodiment in which a cylindrical shape is adopted as the shape of the yoke 32. It is easy to obtain a good heat generation. Furthermore, by adopting a structure in which the yoke 32 is divided as described above, a structure in which the yoke 32 does not cover the entire track of the rotor 31 is obtained. That is, it is possible to reduce the overall size of the heat generator 30 by disposing the heat generating portion so as to face only a part of the path of the rotor 31 instead of the cylinder. Thereby, for example, transportation of the heat generator 30 (road transportation or the like) is facilitated. FIG. 14 shows a case where two yokes 32 to be heat generating portions are arranged so as to face each other across the shaft 34. For example, a structure in which one of the yokes 32 is omitted is adopted. Also good.

  In the above embodiment, the case where the yoke 32 has an arcuate inner peripheral surface in a cross section perpendicular to the shaft 34 is illustrated as a shape of the yoke 32, but the yoke constituting the heat generator of the present invention is not limited to this. For example, it may have a flat shape. In addition, as a material for the current paths 33U, 33D, 33L, and 33R, a general conductive material such as copper may be employed, but a superconducting material may be employed. Thereby, the efficiency of heat generation can be further improved. As the ferromagnetic material, for example, cobalt, nickel, etc. may be employed in addition to iron.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The heat generator and the wind power generation system of the present invention can be particularly advantageously applied to a heat generator using heat generated by an eddy current and a wind power generation system including the heat generator as a component.

  DESCRIPTION OF SYMBOLS 1 Wind thermal power generation system, 10 windmill, 11 main axis | shaft, 12 blade, 20 nacelle, 30 heat generator, 31 rotor, 32 yoke, 32A recessed part, 33U, 33D, 33L, 33R Current path, 34 axis | shaft, 36 piping, 36A inlet , 36B outlet, 40 heat storage section, 50 power generation section, 51 steam turbine, 52 generator, 60 condenser, 71, 72 pump, 81 tower, 82 power generation chamber, 91-97 piping.

Claims (8)

A rotor composed of laminated ferromagnetic plates, having a circular arc shape in a cross section perpendicular to the axial direction, and rotatable about the axis;
A yoke arranged on the outer peripheral side of the rotor and made of a ferromagnetic material;
A heat generator comprising: a current path extending along the axial direction between the rotor and the yoke. The yoke has a cylindrical shape;
Comprising at least one pair of said current paths;
The heat generator according to claim 1, wherein currents in opposite directions flow through the pair of current paths. Comprising two or more pairs of the current paths;
The heat generator according to claim 2, wherein currents in opposite directions flow in the current paths adjacent to each other in a circumferential direction of the yoke.   The heat generator according to claim 1, wherein a plurality of the yokes are arranged along a circumferential direction of the rotor. A concave portion is formed on the surface of the yoke that faces the rotor,
The heat generator according to any one of claims 1 to 4, wherein the current path is disposed so as to pass through the recess. Comprising a plurality of the rotors;
The heat generator according to any one of claims 1 to 5, wherein the plurality of rotors are rotatable on a single annular track.   The heat generator according to any one of claims 1 to 6, wherein a distance between an outer peripheral surface of the rotor and the yoke is different in a circumferential direction of the rotor. With a windmill,
A heat generator connected to the windmill and generating heat by rotation of the windmill;
A heat storage unit connected to the heat generator and storing heat generated in the heat generator;
A power generation unit that is connected to the heat storage unit and converts heat stored in the heat storage unit into electricity;
The heat generator is the heat generator according to any one of claims 1 to 7,
The rotor is a wind thermal power generation system that rotates by rotation of the windmill.

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