JP5293626B2 - Induction heating apparatus and power generation system including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating device in which thermal effect from a heating part to a magnetic field generation means can be suppressed, and to provide a power generation system equipped with it. <P>SOLUTION: The induction heating device 101 includes a geared type rotating body 11 that is fixed to one end side of a rotation shaft 21, a cylindrical stator part 12 arranged at an outer periphery of the rotating body 11, a heating part 13 of a conductive material mounted on an inner peripheral part of the rotating body, a columnar type supporting pillar part 14 arranged so that one end side faces another end side of the rotating body, the magnetic field generation means 15 attached to the supporting pillar part, a yoke part 16 that magnetically connects the stator part with other end side of the supporting pillar part, and a piping that is installed at the heating part and in which a heating medium is circulated. Then, by the magnetic field generation means 15, a magnetic circuit is formed that passes from one end side of the supporting pillar part, through the rotating body, stator part, and the yoke part to reach the other end side of the supporting pillar part, and by changes in a magnetic flux passing through the heating part 13 by rotation of the rotating body 11, the heating part is induction-heated so that the heating medium in the piping is heated. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an induction heating apparatus that heats a heat medium using induction heating and a power generation system including the induction heating apparatus.

  As a device for heating water, a heating device using induction heating (eddy current) has been proposed (for example, see Patent Document 1). In the eddy current heating device described in Patent Document 1, a rotatable rotor having a permanent magnet disposed on the outer periphery, and a conductive passage provided in a fixed manner on the outer periphery of the rotor and having a flow passage through which water flows. A heating part for the material. As the rotor rotates, the magnetic lines of force generated by the permanent magnets on the outer periphery of the rotor move through the heating unit, so that an eddy current is generated in the heating unit and the heating unit itself generates heat. As a result, the heat generated in the heating unit is transmitted to the water flowing through the internal flow passage, and the water is heated.

  The above-mentioned technology is mainly intended to supply hot water using energy such as wind power, but in recent years, power generation systems using renewable energy such as wind power, hydraulic power, and wave power are also attracting attention. .

  For example, Non-Patent Documents 1 to 3 describe technologies relating to wind power generation. In wind power generation, a windmill is rotated by wind and a generator is driven to generate electric power. Wind energy is converted into rotational energy and extracted as electric energy. A wind power generation system generally has a structure in which a nacelle is installed at the top of a tower, and a horizontal axis wind turbine (a wind turbine whose rotation axis is substantially parallel to the wind direction) is attached to the nacelle. The nacelle stores a speed increaser that speeds up and outputs the rotational speed of the rotating shaft of the windmill, and a generator that is driven by the output of the speed increaser. The speed increaser increases the number of rotations of the wind turbine to the number of rotations of the generator (for example, 1: 100), and a gear box is incorporated.

  Recently, there is a tendency to increase the size of a windmill (wind power generation system) in order to reduce the power generation cost, and a wind power generation system with a wind turbine diameter of 120 m or more and an output per unit of 5 MW has been put into practical use. Such large-scale wind power generation systems are huge and heavy, and are often constructed offshore for construction reasons.

  In wind power generation, the power generation output (power generation amount) fluctuates with the fluctuation of wind power. Therefore, a power storage system is added to the wind power generation system, unstable power is stored in the storage battery, and the output is smoothed. It has been broken.

JP 2005-174801 A

“Wind Power Generation (01-05-01-05)”, [online], Atomic Encyclopedia ATOMICA, [Searched on January 12, 2010], Internet <URL: http://www.rist.or.jp/ atomica /> “2000kW large wind power generation system SUBARU80 / 2.0 PROTOTYPE”, [online], Fuji Heavy Industries Ltd., [searched on January 12, 2010], Internet <URL: http://www.subaru-windturbine.jp/home/ index.html> “Wind Lecture”, [online], Mitsubishi Heavy Industries, Ltd. [searched on January 12, 2010], Internet <URL: http://www.mhi.co.jp/products/expand/wind_kouza.html>

  However, in the conventional induction heating apparatus as described in Patent Document 1 described above, since the permanent magnet as the magnetic field generating means is arranged on the outer periphery of the rotor, the following problems may occur.

  Patent Document 1 describes that a neodymium magnet can be used as a permanent magnet (see, in particular, paragraph 0037 of Patent Document 1). However, a neodymium magnet is vulnerable to heat, and the magnetic properties decrease as the temperature rises. (This is the same for general ferrite magnets). In the conventional induction heating apparatus described above, the permanent magnet is disposed so as to face the heating unit, and the distance between the permanent magnet and the heating unit is a short structure. Therefore, the temperature of the permanent magnet is affected by the heat from the heating unit. It tends to rise and the magnetic properties are lowered, and as a result, the heat medium may not be heated to a desired temperature.

  On the other hand, in a generally well-known wind power generation system, a power storage system is installed for smoothing the output. However, since the power storage system requires components such as a converter to store power in the storage battery, This increases complexity and power loss. Further, in the case of a large-scale wind power generation system, a large-capacity storage battery corresponding to the amount of power generation is required, which increases the cost of the entire system.

  Moreover, many of the causes of failure of the wind power generation system are due to problems with the gearbox, more specifically, the gear box. When a gearbox breaks down, it is usually dealt with by exchanging the gearbox. However, if a nacelle is installed at the top of the tower, it takes a lot of time and labor to install and remove the gearbox. Therefore, recently, there is a gearless variable-speed wind generator that does not require a gear box.

  However, the gearless case can be dealt with by specifically increasing the number of poles of the generator (multipolar generator), but the generator becomes larger and heavier than when using a speed increaser. In particular, in a large-scale wind power generation system of 5 MW class, the weight of the generator is considered to exceed 300 tons (300000 kg), and it is difficult to arrange in the nacelle.

  The present invention has been made in view of the above circumstances, and one of its purposes is to provide heat from the heating unit to the magnetic field generating means by devising the arrangement of the magnetic field generating means while having a simple configuration. It is in providing the induction heating apparatus which can suppress an influence. Another object is to provide a power generation system including the induction heating device.

  The induction heating device of the present invention includes a rotating body, a stator portion, a heating portion, a support column portion, a magnetic field generating means, a yoke portion, and a pipe. The rotating body is fixed to one end of the rotating shaft and is made of a magnetic material having a non-circular outer shape. The stator portion is disposed at a predetermined interval on the outer periphery of the rotating body and is made of a magnetic material. The heating unit is disposed between the rotating body and the stator unit and is made of a conductive material. A support pillar part is a columnar member arrange | positioned so that the one end side may oppose the one end side of a rotary body. The magnetic field generating means is attached to the support column and generates a magnetic field for the rotating body. The yoke part is made of a magnetic material, and magnetically connects the stator part and the other end side of the support column part. Piping is provided in a heating part and a heat carrier distribute | circulates. In this apparatus, a magnetic circuit extending from one end side of the support column portion to the other end side of the support column portion through the rotating body, the stator portion, and the yoke portion is formed by the magnetic field generating means. Then, the rotating body rotates due to the rotation of the rotating shaft, and the magnetic flux passing through at least a part of the heating unit disposed between the rotating body and the stator unit is changed, whereby the heating unit is induction-heated, The medium is heated.

  According to the induction heating device of the present invention, since the magnetic field generating means is mounted on the support column portion arranged on one end side of the rotating body, the magnetic field generating means is pivoted from the center of the rotating body to the rotating body. It is located at a position shifted in the direction. As a result, as compared with the conventional induction heating device, the heating unit and the magnetic field generating unit arranged between the rotating body and the stator unit can be arranged at a distance, and the heating unit to the magnetic field generating unit can be arranged. The thermal effect of can be suppressed.

  In the induction heating device of the present invention, the magnetic field generating means is not surrounded by the rotating body due to the axial deviation of the magnetic field generating means with respect to the rotating body, and the magnetic field is not fixed to the supporting column portion fixed without rotating. Since the generating means is mounted, for example, when a coil (electromagnet) is used as the magnetic field generating means, it is easy to handle the power source connected to the coil. In addition, by providing a pipe in the heating section that is fixed without rotating, a rotary joint that allows the pipe to rotate in the connection between the pipe and the supply / discharge pipe that communicates with the pipe and supplies and discharges the heat medium from the outside There is no need to use a simple connection, and a robust connection can be realized. Specifically, when the heat medium is heated, the pressure in the pipe increases. For example, when the heat medium is water (steam), the pressure reaches about 25 MPa (250 atm) at 600 ° C. When the heating part (pipe) rotates, a special rotary joint that can withstand the pressure is required. When it does not rotate, there is no need for a rotary joint. For example, a simple connection such as welding the supply / discharge pipe and the pipe By adopting this method, a sufficiently robust structure can be realized.

  The mechanism by which the heat medium in the induction heating apparatus of the present invention is heated will be described. In the induction heating apparatus of the present invention, magnetic field (magnetic field) is generated by the magnetic field generating means, and the magnetism reaches from the one end side of the support column part to the other end side of the support column part through the rotating body, the stator part, and the yoke part. A circuit is formed. When the non-circular rotating body rotates, a gap (distance) between the rotating body and the stator portion changes in a part between the rotating body and the stator portion. Specifically, when the distance between the rotating body and the stator portion becomes narrow and the rotating body and the stator portion are substantially continuous, magnetic flux easily flows from the rotating body to the stator portion. On the other hand, when the distance between the rotating body and the stator portion becomes large due to the rotation of the rotating body and the rotating body and the stator portion become discontinuous, it is difficult for magnetic flux to flow from the rotating body to the stator portion. As a result, an induction current (eddy current) is generated by changing a magnetic flux (magnetic field) passing through at least a part of the heating unit disposed between the rotating body and the stator unit, and the heating unit is induction-heated. The heating medium is heated.

  In the induction heating device of the present invention, the outer shape of the rotating body is not particularly limited as long as the rotating body has a non-circular shape, and the distance between the rotating body and the stator portion changes during one rotation of the rotating body. Examples of the outer shape of the rotating body include a rectangular shape, an elliptical shape, a polygonal shape, a cross shape, and a gear shape. Examples of the magnetic material include iron, nickel, cobalt, silicon steel, permalloy, and ferrite. Examples of the conductive material include metals such as aluminum, copper, and iron. Examples of the heat medium include water, oil, liquid metals (Na, Pb, etc.), liquids such as molten salts, and gases.

  As one form of the induction heating device of the present invention, the stator portion has a cylindrical shape, and has a protruding portion protruding in a centripetal manner from the cylindrical portion, and the heating portion is attached to the inner peripheral surface of the stator portion. And having a hole through which the protrusion is inserted.

  According to this configuration, the periphery of the protrusion of the stator portion is surrounded by the conductive material that forms the heating portion. And, by the rotation of the rotating body, the distance between the rotating body and the protrusion of the stator portion becomes narrow → wide, or wide → narrow, and when the magnetic flux flowing through the protrusion changes, in the heating part around the protrusion, An induced electromotive force (counterelectromotive force) is generated, and a current flows to heat the electromotive force. Therefore, according to this configuration, the heat medium can be heated using the induced electromotive force in the heating portion around the protrusion, and the presence of the protrusion can be compared with the case where there is no protrusion. When the distance between the rotating body and the stator portion becomes narrow, the amount of magnetic flux flowing from the rotating body to the stator portion (projection portion) increases. As a result, it is possible to increase the change in magnetic flux flowing through the protrusions of the stator portion, increase the induced electromotive force, and improve the heating efficiency.

  As one form of the induction heating apparatus of this invention, it is mentioned that the shape of a rotary body is a gear shape which has the convex part which protrudes to radial direction.

  According to this configuration, during one rotation of the rotating body, the magnetic flux passing through a part of the heating unit changes periodically, and the strength of the magnetic field in this part changes periodically. Further, by reducing the width of the convex portion in the circumferential direction of the rotating body, the magnetic flux flowing from the rotating body (convex portion) to the stator portion is concentrated, and the magnetic flux (magnetic field) passing through the heating portion can be increased. As a result, the change of the magnetic field in the heating unit can be increased, and the heating efficiency can be improved.

  The number of protrusions of the stator part or the number of protrusions of the rotating body is preferably plural, and more preferably four or more. Moreover, when providing a some protrusion part or a some convex part, providing in the circumferential direction of a stator part or a rotary body at equal intervals, for example is mentioned.

  One form of the induction heating device of the present invention is that the magnetic field generating means is a superconducting coil.

  As the magnetic field generation means, a permanent magnet or a coil (electromagnet) can be used. Specific examples of the coil include a normal conducting coil such as a copper wire and a superconducting coil. When using a coil, compared with the case where a permanent magnet is used, a strong magnetic field can be generated. Specifically, it is possible to generate a strong magnetic field by increasing the current supplied to the coil, and it is also possible to adjust the strength of the magnetic field by controlling the supplied current. In addition, in the case of a coil, compared to a permanent magnet, the magnetic characteristics are less likely to deteriorate due to a temperature rise, and the magnetic characteristics are less likely to deteriorate over time. Further, when a heat insulating material is provided around the heating unit to keep the heating unit warm, the heat insulating material is disposed in the middle of the magnetic circuit (specifically, between the rotating body and the heating unit), and the rotating body and the stator Even if the distance to the part increases, it is easy to maintain a sufficient magnetic field strength by increasing the energization current. Therefore, a magnetic field sufficient to heat the heat medium to a predetermined temperature (for example, 100 ° C. to 600 ° C.) can be obtained by using the coil as the magnetic field generating means. In the case of using a coil, a DC power source is connected to the coil to generate a DC magnetic field.

  Furthermore, in the case of a superconducting coil, the electrical resistance is zero, and no heat is generated in the coil even when a large current is passed. Therefore, compared to a normal conducting coil, heat generation of the coil due to flowing a large current can be suppressed, and a stronger magnetic field can be generated.

  As one form of the induction heating apparatus of this invention, the other end side of a rotating shaft is connected to a windmill, and using wind power for the motive power which rotates a rotary body is mentioned.

In the induction heating apparatus of the present invention, as the power of the rotating body (rotating shaft), an internal combustion engine such as an electric motor or an engine can be used, and renewable energy such as wind power, hydraulic power, and wave power can be used. . If renewable energy is used, an increase in CO ₂ can be suppressed, and it is particularly preferable to use wind power.

  The power generation system of the present invention includes the above-described induction heating device of the present invention and a power generation unit that converts heat of the heat medium into electric energy.

  The power generation system of the present invention is a novel power generation system that does not use the heat of the heat medium heated by using the above-described induction heating device for power generation. For example, if a windmill is connected to the rotating shaft of the induction heating device and wind power is used as the power of the rotating body, the wind energy can be converted from rotational energy to thermal energy and extracted as electrical energy. And according to the electric power generation system of this invention, it was set as the structure which converts heat into an electrical energy, By storing energy as heat using a thermal accumulator, efficient and stable electric power generation is realizable. In addition, a heat storage system that can store heat in a heat accumulator and extract heat necessary for power generation is simpler than a power storage system, and the heat accumulator is less expensive than a storage battery. Furthermore, it is not necessary to provide a speed increaser as in the conventional wind power generation system, and it is possible to avoid a gearbox trouble.

  Since the induction heating apparatus of the present invention has a structure in which the magnetic field generating means is attached to the support column portion arranged on one end side of the rotating body, it is possible to suppress the thermal influence from the heating portion to the magnetic field generating means. Further, the power generation system of the present invention is a novel power generation system that does not use the heat of the heat medium heated by using the above-described induction heating device for power generation.

It is the schematic of the induction heating apparatus which concerns on Embodiment 1, (A) is a disassembled perspective view, (B) is a perspective view which shows an assembly state. It is the schematic of the induction heating apparatus which concerns on Embodiment 1, (A) is the front view seen from the rotating shaft side, (B) is side sectional drawing cut | disconnected along the rotating shaft direction. It is a figure which shows typically the time change of the magnetic field in the point a of FIG. 2 (A). It is the schematic of the induction heating apparatus which concerns on Embodiment 2, (A) is a disassembled perspective view, (B) is front sectional drawing cut | disconnected in the direction orthogonal to the axial direction of a rotary body. It is the partial expansion schematic of the induction heating apparatus which concerns on Embodiment 2, (A) shows one state in which the rotary body is rotating, (B) shows another state in which the rotary body is rotating. FIG. 10 is a schematic perspective view showing a modification of the stator portion in the induction heating device according to the second embodiment. It is the schematic of the induction heating apparatus which concerns on Embodiment 3, (A) is side surface sectional drawing cut | disconnected along the rotating shaft direction, (B) is arrow AA of the figure (A). It is the fragmentary sectional view of the magnetic field generation means part seen from. It is the schematic which shows the modification of the magnetic field generation | occurrence | production means in an induction heating apparatus, (A) is a side view of the support pillar part with which the permanent magnet was embedded, (B) is an arrow view of the figure (A) It is sectional drawing seen from AA. It is the schematic which shows the example of arrangement | positioning of the piping in an induction heating apparatus, (A) is an expansion | deployment top view in the case of comprising with one piping, (B) is an expansion | deployment top view in the case of comprising with two piping. (C) is a developed plan view in the case of comprising four pipes. (D) is an expanded plan view showing an attachment example of connection conductors for electrically connecting pipe portions in the arrangement example of FIG. It is a schematic side view which shows another example of arrangement | positioning of piping in an induction heating apparatus. It is the schematic which shows an example of the whole structure of the electric power generation system which concerns on this invention.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

<Induction heating device>
(Embodiment 1)
1 and 2, the induction heating apparatus 101 according to the first embodiment includes a rotating body 11, a stator portion 12, a heating portion 13, a support column portion 14, a magnetic field generating means 15, a yoke portion 16, and piping. 17 and. Hereinafter, the configuration of the induction heating apparatus 101 will be described in detail.

  The rotating body 11 is fixed to one end side of a rotating shaft 21 that is rotatably supported, and the outer shape viewed from the axial direction is formed into a gear shape having a plurality of convex portions 111 protruding in the radial direction. Yes. In this example, there are eight convex portions 111, and each convex portion is provided at equal intervals in the circumferential direction. The rotating body 11 is made of a magnetic material, and in this example, the rotating body 11 is formed of a laminated steel plate in which silicon steel plates are laminated in the rotation axis direction. In addition, a dust core obtained by applying an insulating coating to the surface of a magnetic powder such as iron powder and press-molding the powder may be used. Here, it is assumed that the rotating body 11 rotates counterclockwise (the arrow in FIG. 2A indicates the direction of rotation. The same applies to FIGS. 4B and 5).

  The stator portion 12 is arranged with a predetermined interval between the stator 11 and the rotor 11 so as to cover the outer periphery of the rotor 11. In this example, the stator portion 12 has a cylindrical shape, more specifically, a cylindrical shape. The stator portion 12 is made of a magnetic material and is fixed so as not to rotate.

  The heating unit 13 is disposed between the rotating body 11 and the stator unit 12, and is formed in a cylindrical shape so as to cover the periphery of the rotating body 11. The heating unit 13 is made of a conductive material, and is formed of a metal such as aluminum, copper, or iron, for example. The heating unit 13 is attached to the inner peripheral surface of the stator unit 12 and does not rotate.

  The heating unit 13 is provided with a pipe 17 through which a heat medium flows (see FIG. 2A). In this example, a plurality of flow passages extending in the axial direction are formed inside the heating unit 13, and these are used for the pipe 17 through which the heat medium flows. The heating unit 13 and the pipe 17 are thermally connected. For example, in this example, the heating medium is supplied from one end side of the pipe 17 and discharged from the other end side, or on one end side of the pipe 17, a connecting pipe that connects the pipe 17 and another pipe 17 is attached, For example, the heat medium may be supplied from the other end side of the pipe 17 and discharged from the other end side of another pipe 17 through the connecting pipe. In the latter case, the heating distance of the heat medium can be increased compared to the former case.

  Further, a heat insulating material (not shown) may be disposed around the heating unit 13. For example, in this example, it is possible to provide a heat insulating material at locations other than the location where the pipe 17 is disposed on the inner and outer peripheral surfaces of the heating unit 13 and the end surface of the heating unit 13. As the heat insulating material, for example, rock wool, glass wool, foamed plastic, brick, ceramics, or the like can be used.

  The support column portion 14 is a columnar member that is arranged so that one end side thereof faces one end side of the rotating body 11. In this example, a loose fitting hole 115 is formed at the center of the back surface (one end side surface) of the rotating body 11, and one end portion of the support pillar portion 14 is loosely fitted into the loose fitting hole 115. The shape of the support column part 14 is not particularly limited, and examples thereof include a columnar shape, a cylindrical columnar shape, a polygonal columnar shape, and a polygonal cylindrical columnar shape. ing. Further, the support column portion 14 may be made of either a magnetic material or a nonmagnetic material, and in this example, is formed of a nonmagnetic material. For example, when a permanent magnet or a normal conducting coil is used as the magnetic field generating means, it is preferable to form the support column portion with a magnetic material. On the other hand, when a superconducting coil is used, there is a possibility that the generated magnetic field may be limited due to the saturation magnetic flux of the support column 14, and therefore it may be preferable to form the support column 14 from a nonmagnetic material.

  A coil 15 serving as a magnetic field generating means for generating a magnetic field with respect to the rotating body 11 is attached to the support column portion 14. To position. The coil 15 is connected to a DC power source (not shown). In this example, the direction of the direct current that flows through the coil 15 is controlled to determine the direction of the magnetic field (magnetic flux) to be generated. It is trying to become. The coil 15 is a superconducting coil, and is surrounded by a cooling jacket (not shown) and kept in a superconducting state by cooling.

  The yoke portion 16 is a member that magnetically connects the stator portion 12 and the other end side of the support column portion 14, and is formed of a magnetic material. In this example, one end side of the yoke portion 16 is connected to the stator portion 12, and a plurality of yoke pieces 161 arranged in the circumferential direction so as to cover the outside of the coil 15 are connected to the other end side of each yoke piece. And a base plate 162. In addition, the other end side of the support column portion 14 to which the coil 15 is attached is connected to the base plate 162, whereby the stator portion 12 and the other end side of the support column portion 14 can be magnetically connected. In this example, the yoke portion 16 is configured using a plurality of yoke pieces 161, but may be configured using one substantially cylindrical yoke piece continuous in the circumferential direction.

  Next, the mechanism by which the heat medium in the induction heating device 101 is heated will be described in detail.

  In the induction heating apparatus 101, a magnetic flux (magnetic field) is generated by applying a direct current to the coil 15, and the rotating body 11, the stator part 12, the yoke part 16 (the yoke piece 161 and the base plate) from one end side of the support column part 14. 162) and a magnetic circuit reaching the other end side of the support pillar portion 14 is formed. That is, a closed magnetic circuit is formed by the rotating body 11, the stator portion 12, and the yoke portion 16 (dotted arrows in FIG. 2B indicate an image of the flow of magnetic flux. FIG. 7A is also the same). ). Here, at point a in FIG. 2 (A), the convex portion 111 of the rotator 11 and the stator portion 12 face each other, and the distance between the rotator 11 and the stator portion 12 becomes narrower. As a result, the magnetic resistance is reduced, and the magnetic flux easily flows from the rotating body 11 to the stator portion 12. On the other hand, at point b in FIG. 2 (A), since the convex portion 111 does not exist, the distance between the rotator 11 and the stator portion 12 becomes wide, and the rotator 11 and the stator portion 12 become discontinuous. As a result, the magnetic resistance increases and the magnetic flux hardly flows from the rotating body 11 to the stator portion 12. As a result, the rotation of the rotating body 11 changes the magnetic flux passing over the entire circumference of the heating unit 13, and the strength of the magnetic field in this part changes periodically, thereby causing an induction current (eddy current) in the heating unit 13. ) Occurs, the heating unit 13 is induction-heated, and the heat medium in the pipe 17 is heated.

  FIG. 3 is a diagram schematically showing a temporal change of the magnetic field at point a in FIG. The magnetic field is maximized and maximized when the distance between the rotating body and the stator portion is the smallest, while being minimized and minimized when the distance between the rotating body and the stator portion is the largest.

  In the induction heating apparatus 101, the number of the convex portions 111 of the rotating body 11 and the width of the convex portions 111 in the circumferential direction can be set as appropriate. Here, the period of the magnetic field can be shortened by increasing the number of convex portions 111 to some extent. Since the induction heating energy (induction current) is proportional to the frequency of the magnetic field, the heating efficiency can be improved by shortening the period of the magnetic field. Also, by reducing the width of the convex part 111 to some extent, the magnetic flux flowing from the rotating body 11 (convex part 111) to the stator part 12 is concentrated, so that the distance between the rotating body 11 and the stator part 12 is reduced. The magnetic flux passing through the heating unit 13 to be increased. As a result, the amplitude of the magnetic field applied to the heating unit 13 is increased, and the heating efficiency can be improved.

(Embodiment 2)
The induction heating device 102 according to the second embodiment shown in FIGS. 4 and 5 is different from the induction heating device 101 of the first embodiment shown in FIGS. The explanation will be focused on.

  In the induction heating device 102 according to the second embodiment, the stator unit 12 has a plurality of projections 121 that project centripetally from the cylindrical portion, and each projection 121 is inserted into the heating unit 13. A hole 131 is provided. In this example, the stator portion 12 has eight protrusions 121, and each protrusion is provided at equal intervals in the circumferential direction. Further, the projecting portion 121 is a quadrangular prism having a substantially rectangular cross section cut in a direction orthogonal to the projecting direction parallel to the axial direction of the stator portion 12, and the area of the cross section is the convex portion of the rotating body 11. The area of the cross section of the convex portion cut in the direction orthogonal to the protruding direction of 111 is substantially equal.

  The mechanism by which the heat medium in the induction heating device 102 is heated will be described. By rotating the rotating body 11, the strength of the magnetic field applied to the heating unit 13 is periodically changed, so that an eddy current is generated in the heating unit 13. This is the same as the induction heating device 101 of the first embodiment in that the heating unit 13 is induction-heated and the heat medium in the pipe 17 is heated. Further, in the induction heating device 102, the rotation of the rotating body 11 causes the distance between the convex portion 111 of the rotating body 11 and the protrusion 121 of the stator portion 12 to be narrow → wide or wide → narrow. The magnetic flux flowing through 121 changes (see FIGS. 5A and 5B). As a result, an induced electromotive force (counterelectromotive force) is generated in the heating portion around the protrusion and a current flows, whereby the heating portion 13 is heated and the heat medium in the pipe 17 is heated.

  Thus, in the induction heating device 102, when an induced electromotive force is generated, a continuous current path is formed around the protrusion 121 by the conductive material of the heating part 13 that exists around the protrusion 121. Therefore, unlike the induction heating apparatus 101 of the first embodiment, the heat medium is heated using the induced electromotive force.

  In the induction heating device 102 of the second embodiment, the case where the shape of the protrusion 121 in the stator portion 12 is a quadrangular prism having a substantially rectangular cross section cut in a direction orthogonal to the protruding direction is described as an example. It is not limited to this. For example, as shown in FIG. 6, a skew structure in which the protrusion 121 of the stator portion 12 is inclined with respect to the axial direction of the stator portion 12 can be employed. By adopting the skew structure, the cogging torque can be reduced and the rotation of the rotating body 11 can be made smooth. Further, the convex portion 111 of the rotating body 11 may have a skew structure.

(Embodiment 3)
In the induction heating devices 101 and 102 according to the first and second embodiments described above, the case where one coil 15 is attached to the support column 14 has been described as an example. However, the induction heating device is used in the power generation system according to the present invention described later. When used, it is conceivable that the diameter of the support column 14 reaches 1 m or more, for example, about 2 m. Thus, it may be preferable to configure the magnetic field generating means using a plurality of coils and permanent magnets.

  The induction heating apparatus 103 according to Embodiment 3 shown in FIG. 7 is an example in which a magnetic field generating unit is configured using a plurality of coils. For example, when using a plurality of coils, as illustrated in FIG. 7, it is possible to arrange a plurality of support pillars 14 in a cylindrical shape and attach the coils 15 c to each support pillar 14. In the case of this configuration, by making the direction of the magnetic field generated by each coil 15c the same, the rotating body 11, stator, and the stator are formed from one end side of the support column portion 14 as in the induction heating device 101 shown in FIG. A magnetic circuit that passes through the portion 12 and the yoke portion 16 (the yoke piece 161 and the base plate 162) and reaches the other end side of the support column portion 14 is formed (see FIG. 7A). By configuring the magnetic field generating means using a plurality of coils, one coil can be reduced in size, and the manufacture of the coils is easy.

  In the case of using a plurality of permanent magnets, as illustrated in FIG. 8, a plurality of slits are provided in the circumferential direction of the support member 14, and the permanent magnets 15m are embedded in each slit. Also with this configuration, by making the direction of the generated magnetic field of each permanent magnet 15c the same, a magnetic circuit is formed as in the induction heating device 101 shown in FIG.

  In the induction heating devices 101 to 103 according to the first to third embodiments described above, the flow path is formed inside the heating unit 13, and the case where the heating unit 13 and the pipe 17 are integrally formed has been described as an example. The part 13 and the pipe 17 may be formed separately. In that case, it is preferable that the pipe is also formed of a conductive material. By forming the pipe with a conductive material, the pipe can also be used as a heating unit. Moreover, a heating part and piping may be made into a different body, and piping may be provided in the surface of a heating part. Here, when the pipe is formed of a conductive material and the pipe is also used as a heating unit, for example, the pipe may be attached to the surface of a cylindrical support base in addition to the pipe. At this time, the cylindrical support base may be formed of a material other than the conductive material.

  FIG. 9 is a developed plan view showing an arrangement example of pipes when the pipes are made of a conductive material and only the pipes are arranged. Here, the case where the pipe 17 is wound and attached to the inner peripheral surface of the cylindrical stator portion 12 will be described as an example, and FIG. 9 is a developed plan view of the pipe 17 viewed from the inner peripheral surface side of the stator portion 12. It is. In addition, black arrows in FIG. 9 indicate the supply and discharge directions of the heat medium.

  FIG. 9A shows a case where a single pipe 17 is used, and the pipe 17 is bent and disposed on the entire inner peripheral surface of the stator portion 12 so as to meander in the circumferential direction. By causing the pipe 17 to meander, the heating distance of the heat medium can be increased. In this case, the supply-side end portion and the discharge-side end portion of the pipe 17 are displaced by approximately 360 ° in the circumferential direction, that is, the supply-side end portion and the discharge-side end portion are located at substantially the same position in the circumferential direction. Therefore, there is a concern that the heated heat medium discharged from the discharge side end portion is cooled by the heat medium supplied from the supply side end portion, and the heating efficiency is lowered. Therefore, the supply side end and the discharge side end of the pipe 17 are preferably shifted to some extent in the circumferential direction, for example, by 10 ° or more.

  FIG. 9B shows a case where two pipes 17 are configured. Like FIG. 9A, the pipes 17 are arranged in a meandering manner on the entire inner peripheral surface of the stator portion 12. In this case, the supply-side end portion and the discharge-side end portion of the pipe 17 are shifted by approximately 180 ° in the circumferential direction. Further, in this example, the supply side end portions and the discharge side end portions of the adjacent pipes 17 are located at substantially the same position in the circumferential direction. Therefore, the heated heat medium discharged from the discharge side end of the pipe 17 is not cooled by the heat medium supplied from the supply side end of another pipe 17.

  FIG. 9C shows a case where four pipes 17 are configured. Like FIG. 9B, the pipes 17 are arranged in a meandering manner on the entire inner peripheral surface of the stator portion 12 and are adjacent to each other. The supply-side ends and the discharge-side ends of the pipes 17 are located at substantially the same position in the circumferential direction. In this case, the supply-side end portion and the discharge-side end portion of the pipe 17 are displaced by approximately 90 ° in the circumferential direction.

  Thus, when arrange | positioning piping in a meandering state, you may comprise using several piping. Further, in the example shown in FIGS. 9A to 9C, the supply side end and the discharge side end of the pipe 17 are provided on one side in the axial direction of the stator part 12, but the supply side end Can be provided on one side or the other side, and the discharge side end can be provided on the other side or one side.

  Further, when the stator portion 12 has the protruding portion 121 as in the induction heating devices 102 and 103 of the second and third embodiments described above, the bent portion of the pipe meandering so as to sandwich the protruding portion is A connecting conductor 171 that electrically connects the pipe parts is separately attached to the side where the pipe parts on the opposite side are separated from each other with the protrusions interposed therebetween (see FIG. 9D), and connected to the pipe 17 made of a conductive material. The conductor 171 may surround the periphery of the protrusion 121. As a result, the current associated with the induced electromotive force generated due to the change in the magnetic flux flowing through the protrusion 121 flows through a loop-shaped current path formed by the pipe 17 and the connection conductor 171. It is possible to prevent current from leaking outside through 17.

  Further, when the stator portion has a protruding portion, for example, a pipe 17 made of a conductive material may be wound around and attached to the outer periphery of the protruding portion 121 as illustrated in FIG. Even with this configuration, an induced electromotive force is generated in the pipe 17 due to a change in the magnetic flux flowing through the protrusion 121, and an electric current flows through the pipe 17, whereby the pipe 17 is heated and the heat medium in the pipe 17 is heated. Is done. Furthermore, in order to prevent current from leaking to the outside through the pipe 17, the ends of the winding start and the winding end of the pipe 17 may be electrically connected by a connecting conductor.

  In the induction heating apparatus according to the embodiment of the present invention described above, the magnetic field generating means is located at a position shifted in the axial direction from the center of the rotating body with respect to the rotating body. The arranged heating unit and the magnetic field generating unit can be arranged at a distance from each other, and the thermal influence from the heating unit to the magnetic field generating unit can be suppressed. In addition, by adopting the superconducting coil, it is possible to suppress the heat generation of the coil caused by flowing a large current, and it is possible to generate a stronger magnetic field. In addition, the heating part (pipe) does not rotate, so that, for example, a rotary joint that allows rotation of the pipe to connect the pipe to the supply / discharge pipe that communicates with the pipe and supplies and discharges the heat medium from the outside. There is no need to use a simple connection, and a robust connection can be realized.

<Power generation system>
Next, an example of the overall configuration of the power generation system according to the present invention will be described with reference to FIG. A power generation system P shown in FIG. 11 includes an induction heating device 10, a windmill 20, a heat accumulator 50, and a power generation unit 60. The wind turbine 20 is attached to a nacelle 92 installed at the upper part of the tower 91, and the induction heating device 10 is stored in the nacelle 92. Further, the heat accumulator 50 and the power generation unit 60 are installed in a building 93 built at the lower part (base) of the tower 91. Hereinafter, the configuration of the power generation system P will be described in detail.

  The induction heating device 10 is the induction heating device of the present invention, and for example, the induction heating devices 101 to 103 according to the above-described first to third embodiments can be used. Further, the other end side of the rotating shaft 21 is directly connected to a windmill 20 described later, and wind power is used as power for rotating the rotating body. Here, a case where the heat medium is water will be described as an example.

  The windmill 20 has a structure in which three blades 201 are radially attached to the rotary shaft 21 around a rotary shaft 21 extending in the horizontal direction. In the case of a wind power generation system with an output exceeding 5 MW, the diameter is 120 m or more and the rotation speed is about 10 to 20 rpm.

  Connected to the piping of the induction heating apparatus 10 are a water supply pipe 73 that supplies water to the induction heating apparatus 10 and a transport pipe 51 that sends the water heated by the induction heating apparatus 10 to the regenerator 50. The induction heating device 10 forms a magnetic circuit that passes through the rotating body and the stator portion by direct current energization of the coil, and passes through a heating portion disposed between the rotating body and the stator portion by rotation of the rotating body. By changing the magnetic flux, the heating unit is inductively heated to heat the water in the pipe. Since the induction heating apparatus 10 uses a coil as the magnetic field generating means, it can generate a strong magnetic field and can heat water as a heat medium to a high temperature such as 100 ° C. to 600 ° C., for example. In addition, since the induction heating device 10 has a structure in which the heating unit (pipe) does not rotate, it is not necessary to use a rotary joint for connecting the pipe to the transport pipe 51 and the water supply pipe 73. With a simple configuration, a robust connection can be realized.

  In the power generation system P, water is heated to a temperature suitable for power generation (for example, 200 ° C. to 350 ° C.) by the induction heating device 10 to generate high-temperature and high-pressure water. The high-temperature high-pressure water is sent to the regenerator 50 through a transport pipe 51 that connects the induction heating device 10 and the regenerator 50. The heat accumulator 50 stores the heat of the high-temperature and high-pressure water sent through the transport pipe 51, and supplies steam necessary for power generation to the power generation unit 60 using a heat exchanger. Note that steam may be generated by the induction heating device 10.

  As the heat accumulator 50, for example, a steam accumulator, a sensible heat type using a molten salt or oil, or a latent heat type heat accumulator using a phase change of a molten salt having a high melting point can be used. Since the latent heat type heat storage method stores heat at the phase change temperature of the heat storage material, the heat storage temperature range is generally narrower than that of the sensible heat type heat storage method, and the heat storage density is high.

  The power generation unit 60 has a structure in which a steam turbine 61 and a generator 62 are combined. The steam turbine 61 is rotated by the steam supplied from the heat accumulator 50, and the generator 62 is driven to generate power.

  The high-temperature high-pressure water or steam sent to the regenerator 50 is cooled by the condenser 71 and returned to the water. After that, it is sent to the pump 72 and is circulated by being made into high-pressure water and sent to the induction heating device 10 through the water supply pipe 73.

  According to this power generation system P, it is possible to generate rotational energy by using renewable energy (eg, wind power) as power, generate heat, and store the heat in a heat accumulator to generate electricity, so that an expensive storage battery is not used. However, stable power generation according to demand can be realized. Further, it is not necessary to provide a speed increaser unlike the conventional wind power generation system, and it is possible to avoid a gearbox trouble. Furthermore, by supplying the heat of the heat medium to the power generation unit installed in the lower part (base) of the tower, for example, by a transport pipe, there is no need to store the power generation part in the nacelle, and the nacelle installed in the upper part of the tower is made small -It can be reduced in weight.

  In the power generation system described above, the case where water is used as the heat medium has been described as an example. However, a liquid metal having a higher thermal conductivity than water may be used as the heat medium. An example of such a liquid metal is liquid metal sodium. When using a liquid metal as the heat medium, for example, the liquid metal is used as the primary heat medium that receives heat from the heating unit, and the secondary heat is transmitted through the heat exchanger using the heat of the liquid metal sent through the transport pipe. It is conceivable that the medium (water) is heated to generate steam.

  In addition, when oil, liquid metal, molten salt, or the like having a boiling point of 100 ° C. or higher at normal pressure is used as the heat medium, the heat medium in the pipe when heated to a predetermined temperature compared to water It is easy to suppress an increase in internal pressure due to vaporization.

  Note that the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the gist of the present invention. For example, it is possible to appropriately change the shapes of the rotating body and the stator part, and to appropriately change the material forming the rotating body and the stator part.

  The induction heating apparatus of the present invention can be used for, for example, a hot water supply system and a heating system, in addition to being used for a power generation system using renewable energy. Moreover, the power generation system of the present invention can be suitably used in the field of power generation using renewable energy.

10, 101-103 Induction heating device P Power generation system
11 Rotating body 111 Convex part 115 Free fitting hole
12 Stator part 121 Projection part
13 Heating part 131 Hole
14 Support column
15 Magnetic field generation means (coil) 15c Coil 15m Permanent magnet
16 Yoke part 161 Yoke piece 162 Base plate
17 Piping 171 Connecting conductor
21 Rotation axis
20 Windmill 201 Wings
50 Heat storage unit 51 Transport pipe
60 Power generation section 61 Steam turbine 62 Generator
71 Condenser 72 Pump 73 Water supply pipe
91 Tower 92 Nasser 93 Building

Claims (6)

A rotating body fixed to one end of the rotating shaft and made of a magnetic material having a non-circular outer shape;
A stator portion arranged at a predetermined interval on the outer periphery of the rotating body, and made of a magnetic material;
A heating unit disposed between the rotating body and the stator unit and made of a conductive material;
A columnar support pillar portion arranged so that one end side thereof faces one end side of the rotating body;
Magnetic field generating means mounted on the support column and generating a magnetic field for the rotating body;
A yoke portion made of a magnetic material that magnetically connects the stator portion and the other end side of the support pillar portion;
A pipe provided in the heating unit and through which a heat medium flows,
The magnetic field generating means forms a magnetic circuit from one end side of the support column part to the other end side of the support column part through the rotating body, the stator part, and the yoke part,
The rotating body rotates due to the rotation of the rotating shaft, and the magnetic flux passing through at least a part of the heating unit disposed between the rotating body and the stator unit changes, whereby the heating unit is guided. An induction heating apparatus that is heated to heat the heat medium. The stator portion is cylindrical, and has a protruding portion that projects centripetally from the cylindrical portion,
The induction heating apparatus according to claim 1, wherein the heating unit is attached to an inner peripheral surface of the stator unit and has a hole through which the projection is inserted.   The induction heating device according to claim 1 or 2, wherein the shape of the rotating body is a gear shape having a convex portion protruding in a radial direction.   The induction heating apparatus according to any one of claims 1 to 3, wherein the magnetic field generating means is a superconducting coil. The other end side of the rotating shaft is connected to a windmill,
The induction heating apparatus according to any one of claims 1 to 4, wherein wind power is used as power for rotating the rotating body. Induction heating apparatus according to any one of claims 1 to 5,
And a power generation unit that converts heat of the heat medium into electrical energy.

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