JP2017050915A - Eddy current type heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eddy current type heating device by which kinetic energy of a rotary shaft can be effectively converted into thermal energy and recovered while suppressing a temperature rise of magnets.SOLUTION: A heating device 1 comprises a rotary shaft 3, a heating member 4, a plurality of permanent magnets 5, a magnet holding member 6, a sealed container, a nonmagnetic partition wall 15, a heat recovery mechanism and a cooling mechanism. The rotary shaft 3 is supported in a rotatable manner by a non-rotary part. The heating member 4 is fixed to the rotary shaft 3. The plurality of permanent magnets 5 oppose the heating member 4 while being spaced therefrom and between mutually neighboring permanent magnets, arrangements of magnetic poles are alternately different. The magnet holding member 6 holds the permanent magnets 5 and is fixed o the non-rotary part. The sealed container is fixed to the non-rotary part and encloses the heating member 4 and the permanent magnets 5. The nonmagnetic partition wall 15 partitions the inside of the sealed container into a first space S1 in which the heating member 4 exists and a second space S2 in which the permanent magnets 5 exist. The heat recovery mechanism recovers heat generated in the heating member 4. The cooling mechanism cools the permanent magnets 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat generating device for converting and recovering kinetic energy (rotational power) of a rotating shaft into heat energy. In particular, the present invention relates to an eddy current heating device that uses a permanent magnet (hereinafter, also simply referred to as “magnet”) and uses an eddy current generated by the action of a magnetic field from the magnet.

  In recent years, the generation of carbon dioxide accompanying the combustion of fossil fuels has been regarded as a problem. For this reason, utilization of natural energy such as solar thermal energy, wind energy, and hydraulic energy is promoted. Among natural energies, wind energy, hydraulic energy, etc. are kinetic energy of fluid. Conventionally, power generation is performed using fluid kinetic energy.

  For example, in a general wind power generation facility, an impeller rotates by receiving wind force. The rotating shaft of the impeller is connected to the input shaft of the generator, and the input shaft of the generator rotates as the impeller rotates. Thereby, electricity is generated by the generator. That is, in a general wind power generation facility, wind energy is converted into kinetic energy of the rotating shaft of the impeller, and the kinetic energy of the rotating shaft is converted into electric energy.

  Japanese Patent Laying-Open No. 2011-89492 (Patent Document 1) discloses a wind power generation facility in which energy use efficiency is improved. The power generation facility of Patent Document 1 includes an eddy current reduction device, and generates thermal energy in the process of converting wind energy into electrical energy.

  In the power generation facility of Patent Document 1, wind energy is converted into kinetic energy of the rotating shaft of the impeller, and the kinetic energy of the rotating shaft is converted into hydraulic energy of the hydraulic pump. The hydraulic motor is rotated by the hydraulic energy. The main shaft of the hydraulic motor is connected to the rotating shaft of the eddy current reduction device, and the rotating shaft of the reduction device is connected to the input shaft of the generator. Along with the rotation of the hydraulic motor, the rotation shaft of the speed reducer rotates and the input shaft of the generator rotates. Thereby, electricity is generated by the generator.

  The eddy current type reduction device uses an eddy current generated by the action of a magnetic field from a permanent magnet to reduce the rotational speed of the rotary shaft of the reduction device. As a result, the rotational speed of the main shaft of the hydraulic motor is reduced, and the rotational speed of the impeller is adjusted via the hydraulic pump.

  Further, in the eddy current type speed reducer, heat is generated at the same time as a braking force for reducing the rotational speed of the rotating shaft is generated due to the generation of the eddy current. That is, a part of wind energy is converted into heat energy. The heat (heat energy) is recovered by the heat storage device, and the prime mover is driven by the recovered heat energy. Patent Document 1 describes that a generator is driven by driving a prime mover, and as a result, electricity is generated by the generator. From this, it can be said that the eddy current type reduction gear of patent document 1 is a heat generating device for converting and recovering the kinetic energy of the rotating shaft of the impeller into thermal energy.

  Further, the eddy current type speed reducer may be mounted as an auxiliary brake on vehicles such as trucks and buses. In this case, the speed reducer decelerates the rotational speed of a rotating shaft such as a propeller shaft or a drive shaft. Thereby, the running speed of the vehicle is adjusted. At that time, a braking force for reducing the rotational speed of the rotating shaft is generated and at the same time, heat is generated. Therefore, also in the eddy current type reduction gear mounted on the vehicle, the kinetic energy of the rotating shaft is converted into thermal energy, and it is desired to recover and use this thermal energy.

JP 2011-89492 A

  The wind power generation facility of Patent Document 1 includes a hydraulic pump and a hydraulic motor between an impeller that is a rotating shaft and an eddy current reduction device (heat generating device). This complicates the equipment structure. In addition, energy conversion loss is significant because multi-stage energy conversion is required. Along with this, the thermal energy obtained by the eddy current type reduction device as the heat generating device is also reduced.

  Further, in the case of the eddy current reduction device of Patent Document 1, a plurality of magnets are opposed to the inner peripheral surface of the cylindrical rotor and are arranged in the circumferential direction. Arrangement of magnetic poles (N pole, S pole) of these magnets is uniform in the circumferential direction around the rotation axis and adjacent to each other in the circumferential direction. For this reason, the magnetic field from a magnet does not spread and the magnetic flux density which reaches | attains a rotor is small. If it does so, the eddy current which arises in a rotor by the effect | action of the magnetic field from a magnet will become small substantially, and sufficient heat_generation | fever cannot be obtained.

  Furthermore, in the case of the eddy current reduction device of Patent Document 1, the temperature of the magnet may rise during operation. When the temperature rise of the magnet becomes significant, the magnetic force decreases. Hereinafter, such a situation is also referred to as demagnetization. When the magnetic force is reduced, the eddy current generated in the rotor is further reduced, and sufficient heat generation cannot be obtained.

  The present invention has been made in view of the above circumstances. An object of the present invention is to provide an eddy current heating device that can suppress a temperature rise of a magnet and can effectively convert kinetic energy (rotational power) of a rotating shaft into heat energy and recover it. is there.

  An eddy current heating device according to an embodiment of the present invention has the following configuration (1) or (2).

(1) a rotating shaft rotatably supported by the non-rotating portion;
A heat generating member fixed to the rotating shaft;
A plurality of permanent magnets opposed to each other with a gap between the heat generating members, and the magnetic poles alternately arranged with each other adjacent to each other,
A magnet holding member that holds the permanent magnet and is fixed to the non-rotating portion;
A sealed container that is fixed to the non-rotating portion and surrounds the heat generating member and the permanent magnet;
A non-magnetic partition that partitions the inside of the sealed container into a first space in which the heat generating member is present and a second space in which the permanent magnet is present;
A heat recovery mechanism for recovering heat generated in the heat generating member;
A cooling mechanism for cooling the permanent magnet.

(2) a rotating shaft rotatably supported by the non-rotating portion;
A heat generating member fixed to the non-rotating part;
A plurality of permanent magnets opposed to each other with a gap between the heat generating members, and the magnetic poles alternately arranged with each other adjacent to each other,
A magnet holding member that holds the permanent magnet and is fixed to the rotating shaft;
A sealed container that is fixed to the non-rotating portion and surrounds the heat generating member and the permanent magnet;
A non-magnetic partition that partitions the inside of the sealed container into a first space in which the heat generating member is present and a second space in which the permanent magnet is present;
A heat recovery mechanism for recovering heat generated in the heat generating member;
A cooling mechanism for cooling the permanent magnet.

  The eddy current heating device according to (1) or (2) further includes the following configuration.

The heat recovery mechanism is
A first pipe connected to each of an inlet and an outlet connected to the first space of the sealed container;
A heat storage device connected to each of the first pipes;
A heat storage heat medium that circulates through the first space, the first pipe, and the heat storage device.
The cooling mechanism is
A second pipe connected to each of an inlet and an outlet connected to the second space of the sealed container;
A heat exchanger connected to each first pipe and each second pipe;
A heat medium for cooling the magnet that circulates through the second space, the second pipe, and the heat exchanger.
The heat exchanger is
A regenerator, a condenser, an evaporator, an absorber, and a cooling tower, and a heat exchanger for heat exchanger that circulates through the regenerator, the condenser, the evaporator, and the absorber. .
The regenerator evaporates the heat exchanger heat medium by heat exchange between the heat storage heat medium from the first pipe and the liquefied heat exchanger heat medium.
The evaporator evaporates the heat exchanger heat medium by heat exchange between the magnet cooling heat medium from the second pipe and the liquefied heat exchanger heat medium.

  According to the eddy current heating device of the present invention, the temperature rise of the magnet can be suppressed, and the kinetic energy of the rotating shaft can be effectively converted into heat energy and recovered.

FIG. 1 is a longitudinal sectional view of the heat generating device of the first embodiment. FIG. 2 is a cross-sectional view of the heat generating device of the first embodiment. Drawing 3 is a figure showing typically the heat exchanger of a 1st embodiment. FIG. 4 is a cross-sectional view illustrating an example of a preferable aspect of the heat generating member in the heat generating device of the first embodiment. FIG. 5 is a longitudinal sectional view of the heat generating device of the second embodiment. FIG. 6 is a longitudinal sectional view of the heat generating device of the third embodiment. FIG. 7 is a diagram schematically illustrating a heat exchanger according to the third embodiment.

  An eddy current heating device according to an embodiment of the present invention includes a rotating shaft, a heating member, a plurality of permanent magnets, a magnet holding member, a sealed container, a non-magnetic partition, a heat recovery mechanism, and a cooling mechanism. . The rotating shaft is rotatably supported by the non-rotating portion. The heat generating member is fixed to the rotating shaft. The plurality of permanent magnets are opposed to the heat generating member with a gap, and the arrangement of the magnetic poles is alternately different between those adjacent to each other. The magnet holding member holds the permanent magnet and is fixed to the non-rotating portion. The sealed container is fixed to the non-rotating portion and surrounds the heat generating member and the permanent magnet. The nonmagnetic partition partitions the inside of the sealed container into a first space where the heat generating member is present and a second space where the permanent magnet is present. The heat recovery mechanism recovers heat generated in the heat generating member. The cooling mechanism cools the permanent magnet.

  In the eddy current heating device according to another embodiment of the present invention, the heat generating member may be fixed to the non-rotating portion. In this case, the magnet holding member is fixed to the rotating shaft.

  The heat recovery mechanism includes a first pipe, a heat storage device, and a heat storage heat medium. The first pipe is connected to an inlet and an outlet connected to the first space of the sealed container. The heat storage device is connected to each of the first pipes. The heat storage heat medium circulates through the first space, the first pipe, and the heat storage device.

  The cooling mechanism includes a second pipe, a heat exchanger, and a heat medium for cooling the magnet. The second pipe is connected to each of an inlet and an outlet connected to the second space of the sealed container. The heat exchanger is connected to each first pipe and each second pipe. The magnet cooling heat medium circulates through the second space, the second pipe, and the heat exchanger.

  The heat exchanger includes a regenerator, a condenser, an evaporator, an absorber, and a cooling tower, and includes a heat exchanger heat exchanger. The heat exchanger heat medium circulates through the regenerator, the condenser, the evaporator, and the absorber. The regenerator evaporates the heat exchanger heat medium by heat exchange between the heat storage heat medium from the first pipe and the liquefied heat exchanger heat medium. The evaporator evaporates the heat exchanger heat medium by heat exchange between the magnet cooling heat medium from the second pipe and the liquefied heat exchanger heat medium.

  According to the eddy current heating device of the present embodiment, the magnetic pole density of the magnet facing the heating member is alternately different between adjacent magnets, so that the magnetic field from the magnet spreads and the magnetic flux density reaches the heating member. Will increase. Thereby, the eddy current generated in the heat generating member by the action of the magnetic field from the magnet is increased, and sufficient heat generation is obtained. Moreover, the magnet is cooled by the cooling mechanism. By this cooling, the temperature rise of the magnet is suppressed and demagnetization is unlikely to occur. Therefore, the kinetic energy of the rotating shaft can be effectively converted into heat energy and recovered.

  The above-described heat generating device can employ the following configuration. A pair of third pipes that are open to the outside air are connected to the heat exchanger instead of the first pipes. The regenerator evaporates the heat exchanger heat medium by heat exchange between the outside air from the third pipes and the liquefied heat exchanger heat medium.

  The heat generating device can be mounted on a power generation facility using fluid kinetic energy such as a wind power generation facility or a hydropower generation facility. Moreover, said heat generating apparatus can be mounted in a vehicle. In any case, the heat generating device converts the kinetic energy of the rotating shaft into heat energy and recovers it. The recovered thermal energy is used for generating electric energy, for example.

  Hereinafter, embodiments of the eddy current heating device of the present invention will be described in detail.

[First Embodiment]
FIG. 1 is a longitudinal sectional view of the heat generating device of the first embodiment. FIG. 2 is a cross-sectional view of the heat generating device of the first embodiment. 1 and 2 illustrate a heat generating device 1 mounted on a wind power generation facility. As shown in FIG. 1, the heat generating device 1 of the first embodiment includes a rotating shaft 3, a heat generating member 4, a plurality of permanent magnets 5, a magnet holding member 6, a sealed container, and a nonmagnetic partition wall 15. And a heat recovery mechanism and a cooling mechanism. The rotating shaft 3 is rotatably supported via a bearing 7 with respect to the fixed main body 2 that is a non-rotating portion.

  The heat generating member 4 is fixed to the rotating shaft 3. The heat generating member 4 includes a cylindrical member 4A having the rotating shaft 3 as an axis, and a disk-shaped connecting member 4B connecting the cylindrical member 4A and the rotating shaft 3. The connecting member 4B is provided with a plurality of through holes 4C for weight reduction and heat recovery. The magnet holding member 6 is disposed outside the heat generating member 4 and is fixed to the main body 2. The magnet holding member 6 includes a cylindrical member 6a having the rotation shaft 3 as an axis. The cylindrical member 6 a holds the magnet 5.

  The magnet 5 is fixed to the inner peripheral surface of the cylindrical member 6a and faces the outer peripheral surface of the heat generating member 4 (cylindrical member 4A) with a gap. Here, as shown in FIG. 2, the magnets 5 are arranged over the circumferential direction. Arrangement of the magnetic poles (N pole, S pole) of these magnets 5 is different in the radial direction centering on the rotating shaft 3 and alternately between the magnets 5 adjacent in the circumferential direction. In the case of the first embodiment, the material of the cylindrical member 6a that directly holds the magnet 5 is a ferromagnetic material.

  The material of the heat generating member 4, in particular, the material of the outer layer of the cylindrical member 4 </ b> A facing the magnet 5 is a conductive material. Examples of conductive materials include ferromagnetic metal materials (eg, carbon steel, cast iron, etc.), weak magnetic metal materials (eg: ferritic stainless steel, etc.), or non-magnetic metal materials (eg, aluminum alloys, austenitic stainless steel, Copper alloy etc.).

  In the first embodiment, the sealed container is formed by the main body 2 and the cylindrical member 6 a of the magnet holding member 6. That is, the sealed container is fixed to the non-rotating part. The sealed container surrounds the heat generating member 4 and the magnet 5. A cylindrical partition wall 15 is disposed in the gap between the heat generating member 4 and the magnet 5. The partition wall 15 is fixed to the main body 2. The partition 15 partitions the inside of the sealed container into a first space S1 and a second space S2. The heat generating member 4 is present in the first space S1. A magnet 5 is present in the second space S2. The material of the partition 15 is a nonmagnetic material. This is to prevent the magnetic field from the magnet 5 to the heat generating member 4 from being adversely affected. In the first embodiment, an inlet 11 and an outlet 12 connected to the first space S1 are provided. A suction port 13 and a discharge port 14 connected to the second space S2 are provided.

  When the rotating shaft 3 rotates, the heat generating member 4 rotates integrally with the rotating shaft 3 (see the white arrow in FIG. 1). Thereby, a relative rotational speed difference is generated between the magnet 5 and the heat generating member 4. At this time, as shown in FIG. 2, with respect to the magnet 5 facing the outer peripheral surface of the heat generating member 4 (cylindrical member 4 </ b> A), the arrangement of the magnetic poles (N pole, S pole) is in the radial direction centering on the rotating shaft 3. Thus, the magnets 5 adjacent in the circumferential direction are alternately different. The cylindrical member 6a that holds the magnet 5 is a ferromagnetic material.

  For this reason, the magnetic flux (magnetic field) from the magnet 5 is as follows. The magnetic flux emitted from the N pole of one of the magnets 5 adjacent to each other reaches the heat generating member 4 (cylindrical member 4 </ b> A) facing this magnet 5. The magnetic flux that has reached the heat generating member 4 reaches the south pole of the other magnet 5. The magnetic flux emitted from the N pole of the other magnet 5 reaches the S pole of one magnet 5 through the cylindrical member 6a. That is, a magnetic circuit including the magnets 5 is formed between the magnets 5 adjacent to each other in the circumferential direction, the cylindrical member 6 a that holds the magnets 5, and the heat generating member 4. Such a magnetic circuit is formed by alternately reversing the direction of the magnetic flux over the entire circumferential direction. If it does so, the magnetic field from the magnet 5 will spread and the magnetic flux density which reaches | attains the heat generating member 4 will increase.

  When a magnetic field acts on the heat generating member 4 from the magnet 5 in a state where a relative rotational speed difference is generated between the magnet 5 and the heat generating member 4, an eddy current is generated on the outer peripheral surface of the heat generating member 4 (cylindrical member 4A). To do. Due to the interaction between the eddy current and the magnetic flux density from the magnet 5, a braking force in the direction opposite to the rotational direction is generated in the heat generating member 4 rotating integrally with the rotating shaft 3 in accordance with Fleming's left-hand rule.

  Furthermore, due to the generation of eddy current, braking force is generated and heat is generated in the heat generating member 4 at the same time. As described above, since the magnetic flux density reaching the heat generating member 4 is large, the eddy current generated in the heat generating member 4 due to the action of the magnetic field from the magnet 5 is increased, and sufficient heat generation is obtained.

  The heat generating device 1 includes a heat recovery mechanism in order to recover and utilize the heat generated in the heat generating member 4. The heat recovery mechanism includes a first pipe, a heat storage device, and a heat storage heat medium.

  The first pipe includes an inlet side pipe 41 and an outlet side pipe 42. An inlet side pipe 41 and an outlet side pipe 42 are connected to the inlet 11 and the outlet 12 of the first space S1 (heating member existence space), respectively. Further, the inlet side pipe 41 and the outlet side pipe 42 are connected to the heat storage device 50. Further, the first pipe is also connected to the heat exchanger 35. Specifically, as shown in FIG. 1, the outlet side pipe 42 is branched and connected to the heat storage device 50 and the heat exchanger 35. Similarly, the inlet side pipe 41 is branched and connected to the heat storage device 50 and the heat exchanger 35. More specifically, as will be described later, the inlet side pipe 41 and the outlet side pipe 42 are connected to the regenerator 35A of the heat exchanger 35. The first space S1, the first pipe, and the heat storage device 50 form a series of paths through which the heat storage heat medium circulates and circulates (see solid arrows in FIG. 1). Further, a part of the heat storage heat medium in the outlet side pipe 42 is branched from the above path and led to the heat exchanger 35. A valve 39 is disposed at the branch point of the outlet side pipe 42. The valve 39 adjusts the flow rate of the heat storage heat medium to be branched. When the branched heat storage heat medium exits the heat exchanger 35, it joins the above-described path. A pump 36 for sending out a heat storage heat medium is installed in this path.

  According to such a configuration, the heat storage heat medium is introduced into the first space S <b> 1 from the inlet 11 by driving the pump 36 (see the solid line arrow in FIG. 1). The heat storage heat medium introduced into the first space S <b> 1 circulates in the vicinity of the heat generating member 4. The heat generated in the heat generating member 4 is transmitted to the heat storage heat medium that flows through the first space S1. The heat storage heat medium in the first space S <b> 1 is discharged from the outlet 12 of the first space S <b> 1 and guided to the heat storage device 50 through the outlet side pipe 42. The heat storage device 50 receives and collects heat from the heat storage heat medium by heat exchange, and stores the heat. The heat storage heat medium that has passed through the heat storage device 50 returns from the inlet 11 to the first space S <b> 1 through the inlet pipe 41. In this way, the heat generated in the heat generating member 4 is recovered. The heat storage heat medium guided to the heat exchanger 35 is utilized for cooling the magnet cooling heat medium, as will be described later.

The heat storage heat medium is, for example, a nitrate-based molten salt (eg, a mixed salt of 60% sodium nitrate and 40% potassium nitrate). In addition to the heat storage heat medium, heat medium oil, water (steam), air, supercritical CO ₂ or the like may be applied.

  As described above, in the eddy current heating device, since the temperature of the magnet 5 rises, demagnetization of the magnet 5 is likely to occur. Therefore, the heat generating device 1 includes a cooling mechanism in order to cool the magnet 5. The cooling mechanism includes a second pipe, a heat exchanger 35, and a magnet cooling heat medium.

  The second pipe includes a suction side pipe 31 and a discharge side pipe 32. A suction side pipe 31 and a discharge side pipe 32 are connected to the suction port 13 and the discharge port 14 of the second space S2 (magnet presence space), respectively. The suction side pipe 31 and the discharge side pipe 32 are connected to the heat exchanger 35. More specifically, as will be described later, the suction side pipe 31 and the discharge side pipe 32 are connected to an evaporator 35C. The second space S2, the suction side pipe 31, the discharge side pipe 32, and the heat exchanger 35 form a series of paths through which the magnet cooling heat medium circulates and circulates (dotted line arrows in FIG. 1). reference). A pump 38 for sending out a heat medium for cooling the magnet is installed in this path.

According to such a configuration, the heat medium for cooling the magnet is introduced from the suction port 13 into the second space S2 by driving the pump 38 (see the dotted line arrow in FIG. 1). The magnet cooling heat medium introduced into the second space S <b> 2 circulates in the vicinity of the magnet 5. At that time, the magnet 5 is cooled. The magnet cooling heat medium that has cooled the magnet 5 is discharged from the discharge port 14 to the discharge side pipe 32 (see the dotted arrow in FIG. 1). The heat medium for cooling the magnet discharged to the discharge side pipe 32 is cooled by the heat exchanger 35 and sent to the suction side pipe 31. In this way, the magnet 5 can be forcibly cooled by the magnet cooling heat medium, and the temperature rise of the magnet 5 can be suppressed. The heat medium for cooling the magnet is, for example, air, water, heat medium oil, CO ₂ or the like. For the sake of simplicity, piping and the like connected to the inlet 11 shown at the top in FIG.

Drawing 3 is a figure showing typically the heat exchanger of a 1st embodiment. As shown in FIG. 1, the heat exchanger 35 includes a regenerator 35A, a condenser 35B, an evaporator 35C, an absorber 35D, and a cooling tower 36. Furthermore, the heat exchanger 35 includes a heat exchanger heat exchanger. The regenerator 35A, the condenser 35B, the evaporator 35C, and the absorber 35D form a series of paths through which the heat exchanger heat medium flows and circulates. The heat medium for the heat exchanger is, for example, water, CO ₂ , ammonia, propane, isobutane, or chlorofluorocarbon.

  The regenerator 35A is connected to a first pipe (incoming pipe 41 and outgoing pipe 42) from the first space S1. A liquefied heat exchanger heat exchanger exists in the regenerator 35A. Specifically, the high-temperature heat storage heat medium that has exited the first space S1 enters the regenerator 35A via the first pipe (outlet pipe 42). In the regenerator 35A, the high-temperature heat storage heat medium and the liquefied heat exchanger heat medium exchange heat. That is, the heat storage heat medium gives heat energy to the heat exchanger heat medium. After heat exchange, the heat storage heat medium exits the regenerator 35A via the first pipe (inlet pipe 41). By this heat exchange, the heat medium for the heat exchanger evaporates. The vaporized heat exchanger heat medium is guided to the condenser 35B.

  A cooling pipe 37 of the cooling tower 36 is connected to the condenser 35B. A refrigerant body circulates in the cooling pipe 37. In the condenser 35B, the refrigerant body from the cooling pipe 37 exchanges heat with the vaporized heat exchanger heat medium. By this heat exchange, the heat medium for the heat exchanger is liquefied. The liquefied heat exchanger heat medium is guided to the evaporator 35C.

  The evaporator 35C is connected to a second pipe (suction side pipe 31 and discharge side pipe 32) from the second space S2. A liquefied heat exchanger heat medium is present in the evaporator 35C. Specifically, the high-temperature magnet cooling heat medium exiting the second space S2 enters the evaporator 35C through the second pipe (discharge side pipe 32). In the evaporator 35C, the high-temperature magnet cooling heat medium and the liquefied heat exchanger heat medium exchange heat. That is, the heat medium for cooling the magnet gives heat energy to the heat medium for heat exchanger. After heat exchange, the heat medium for cooling the magnet exits the evaporator 35C via the second pipe (suction side pipe 31). By this heat exchange, the heat medium for the heat exchanger evaporates. At this time, the heat exchanger heat medium takes heat of vaporization from the magnet cooling heat medium. Therefore, the magnet cooling heat medium is cooled. The cooled heat medium for cooling the magnet passes through the second pipe (suction side pipe 31) and returns to the second space S2. Thereby, the magnet 5 is cooled. The vaporized heat exchanger heat medium is guided to the absorber 35D.

  A cooling pipe 37 of the cooling tower 36 is connected to the absorber 35D. In the absorber 35D, the refrigerant body from the cooling pipe 37 and the vaporized heat exchanger heat medium exchange heat. By this heat exchange, the heat medium for the heat exchanger is liquefied. The liquefied heat exchanger heat medium returns to the regenerator 35A.

  In the heat generating device 1 of the first embodiment, sufficient heat generation is obtained by the heat generating member 4 as described above. Moreover, in the heat generating device 1 of the first embodiment, a part of the heat storage heat medium is guided to the heat exchanger 35. The magnet cooling heat medium is cooled by utilizing the heat of the heat storage heat medium. And since the magnet 5 is cooled with the cooled heat medium for magnet cooling, the temperature rise of the magnet 5 can be suppressed. As a result, demagnetization of the magnet 5 is unlikely to occur even when the heating device 1 performs continuous operation. Therefore, the kinetic energy of the rotating shaft 3 can be effectively converted into heat energy and recovered.

  The heat generating apparatus 1 according to the first embodiment is mounted on a wind power generation facility. That is, as shown in FIG. 1, an impeller 20 that is a windmill is provided on an extension line of the rotating shaft 3 of the heat generating device 1. The rotating shaft 21 of the impeller 20 is rotatably supported via a bearing 25 with respect to the fixed main body 2. The rotating shaft 21 of the impeller 20 is connected to the rotating shaft 3 of the heat generating device 1 through the clutch device 23 and the speed increasing device 24. As the rotating shaft 21 of the impeller 20 rotates, the rotating shaft 3 of the heat generating device 1 rotates. At this time, the rotational speed of the rotating shaft 3 of the heat generating device 1 is increased by the speed increasing device 24 more than the rotational speed of the rotating shaft 21 of the impeller 20. For example, a planetary gear mechanism can be applied to the speed increasing device 24.

  In such a wind power generation facility, the impeller 20 receives wind force and rotates (see the white arrow in FIG. 1). As the impeller 20 rotates, the rotating shaft 3 of the heat generating device 1 rotates. Thereby, heat is generated in the heat generating member 4, and the generated heat is recovered by the heat storage device. That is, a part of the kinetic energy of the rotating shaft 3 of the heat generating device 1 based on the rotation of the impeller 20 is converted into heat energy and recovered. In that case, since there is no hydraulic pump and hydraulic motor like the wind power generation equipment of patent document 1 between the impeller 20 and the heat generating apparatus 1, there is little energy conversion loss. The heat recovered by the heat storage device is used for power generation by a heat element, a Stirling engine or the like, for example.

  Furthermore, when the rotating shaft 3 of the heat generating device 1 rotates, the heating member 4 generates heat, and at the same time, a braking force that reduces the rotation is generated on the rotating shaft 3. Thereby, the rotational speed of the impeller 20 is adjusted via the speed increasing device 24 and the clutch device 23. Here, the clutch device 23 has the following functions. When the heat generating device 1 needs to generate heat, the clutch device 23 connects the rotating shaft 21 of the impeller 20 and the rotating shaft 3 of the heat generating device 1. Thereby, the rotational power of the impeller 20 is transmitted to the heat generating device 1. When the amount of heat accumulated in the heat storage device reaches an allowable amount and the heat generation device 1 no longer needs to generate heat, or when the heat generation device 1 is stopped for maintenance, the clutch device 23 rotates the impeller 20. The connection between the shaft 21 and the rotating shaft 3 of the heat generating device 1 is disconnected. Thereby, the rotational power of the impeller 20 is not transmitted to the heat generating device 1. At this time, a frictional or electromagnetic brake device 22 for stopping the rotation of the impeller 20 is installed between the impeller 20 and the clutch device 23 so that the impeller 20 is not freely rotated by wind power. It is preferable to do this.

  As described above, the heat generating member 4 generates heat due to the eddy current generated in the heat generating member 4 (cylindrical member 4A). For this reason, the temperature of the magnet 5 is increased by the radiant heat from the heat generating member 4, and the magnetic force held by the magnet 5 may decrease. Therefore, it is desirable to devise measures to suppress the temperature rise of the magnet 5.

  In this regard, in the heat generating device 1 of the first embodiment, the radiant heat from the heat generating member 4 is blocked by the partition wall 15. Thereby, in addition to the cooling of the magnet 5 by a cooling mechanism, the temperature rise of the magnet 5 can be further prevented. Further, in this case, it is preferable that a heat insulating material is filled between the magnet 5 and the partition wall 15 or a vacuum state is provided between the magnet 5 and the partition wall 15. This is because the radiant heat from the heat generating member 4 can be blocked more reliably.

  FIG. 4 is a cross-sectional view illustrating an example of a preferable aspect of the heat generating member in the heat generating device of the first embodiment. 4, the vicinity of the outer peripheral surface of the heat generating member 4 (cylindrical member 4A) facing the magnet 5 is shown enlarged. As shown in FIG. 4, in the heat generating member 4, the first layer 4b, the second layer 4c, and the antioxidant coating layer 4d are sequentially laminated on the outer peripheral surface of the substrate 4a. The material of the base material 4a is a conductive metal material (eg, copper alloy, aluminum alloy, etc.) having a high thermal conductivity. The material of the first layer 4b is a ferromagnetic metal material (eg, carbon steel, cast iron, etc.). The material of the second layer 4c is a non-magnetic metal material or a weak magnetic metal material, and in particular, a material having higher conductivity than the first layer 4b (eg, aluminum alloy, copper alloy, etc.) is desirable. The antioxidant coating layer 4d is a Ni (nickel) plating layer, for example.

  Buffer layers 4e are laminated between the base material 4a and the first layer 4b, between the first layer 4b and the second layer 4c, and between the second layer 4c and the antioxidant coating layer 4d, respectively. The linear expansion coefficient of the buffer layer 4e is larger than the linear expansion coefficient of one adjacent material and smaller than the linear expansion coefficient of the other material. This is to prevent peeling of each layer. The buffer layer 4e is, for example, a NiP (nickel-phosphorus) plating layer.

  According to such a laminated structure, the eddy current generated in the heat generating member 4 by the action of the magnetic field from the magnet 5 becomes larger, and it becomes possible to obtain a high braking force and more sufficient heat generation. However, the second layer 4c may be omitted, and the buffer layer 4e may be omitted.

[Second Embodiment]
FIG. 5 is a longitudinal sectional view of the heat generating device of the second embodiment. The heat generating device 1 of the second embodiment shown in FIG. 5 is based on the configuration of the heat generating device 1 of the first embodiment. The heat generating device 1 of the second embodiment is different from the first embodiment in that the heat generating member 4 is mainly fixed to the non-rotating portion and the magnet 5 is fixed to the rotating shaft 3.

  The heat generating member 4 has a cylindrical shape with the rotating shaft 3 as an axis, and is fixed to the main body 2 (non-rotating portion). The magnet holding member 6 is disposed inside the heat generating member 4 and is fixed to the rotating shaft 3. The magnet holding member 6 includes a cylindrical member 6 a having the rotating shaft 3 as an axis, and a disk-shaped connecting member 6 b that connects the cylindrical member 6 a and the rotating shaft 3. The cylindrical member 6 a holds the magnet 5. The connecting member 6b is provided with a plurality of through holes 6c for weight reduction.

  The magnet 5 is fixed to the outer peripheral surface of the cylindrical member 6 a and faces the inner peripheral surface of the heat generating member 4 with a gap. Here, the magnets 5 are arranged over the circumferential direction. Arrangement of the magnetic poles (N pole, S pole) of these magnets 5 is different in the radial direction centering on the rotating shaft 3 and alternately between the magnets 5 adjacent in the circumferential direction. In the case of the second embodiment, the material of the cylindrical member 6a that directly holds the magnet 5 is a ferromagnetic material. In addition, a cylindrical cover 8 is disposed outside the heat generating member 4 so as to surround the whole. This cover 8 is fixed to the main body 2.

  In the second embodiment, the sealed container is formed of the main body 2 and the cover 8. Similar to the first embodiment, a cylindrical partition wall 15 is disposed in the gap between the heat generating member 4 and the magnet 5. The partition 15 partitions the inside of the sealed container into a first space S1 and a second space S2. The heat generating member 4 is present in the first space S1. A magnet 5 is present in the second space S2.

  In short, in the second embodiment, the magnet 5 rotates relative to the fixed heat generating member 4. Thereby, a relative rotational speed difference is generated between the magnet 5 and the heat generating member 4. Therefore, as in the first embodiment, sufficient heat generation is obtained by the heat generating member 4. Similarly to the first embodiment, the heat generating device 1 of the second embodiment includes a cooling mechanism. Therefore, since the temperature rise of the magnet 5 is also suppressed, the kinetic energy of the rotating shaft 3 can be effectively converted into heat energy and recovered.

[Third Embodiment]
FIG. 6 is a longitudinal sectional view of the heat generating device of the third embodiment. The heat generating device 1 of the third embodiment shown in FIG. 6 is based on the configuration of the heat generating device 1 of the first embodiment. Compared with the first embodiment, the heat generating device 1 of the third embodiment is mainly connected to the heat exchanger 35 with a third pipe instead of the first pipe (incoming side pipe 41 and outgoing side pipe 42). Is different.

  The first pipe includes an inlet side pipe 41 and an outlet side pipe 42. Similarly to the first embodiment, an inlet side pipe 41 and an outlet side pipe 42 are connected to each of the inlet 11 and the outlet 12 of the first space S1. The inlet side piping 41 and the outlet side piping 42 are connected to the heat storage device 50. In the third embodiment, the inlet side pipe 41 and the outlet side pipe 42 are not connected to the heat exchanger 35.

  In the third embodiment, a pair of third pipes are connected to the heat exchanger 35. The third pipe includes an inlet side pipe 61 and an outlet side pipe 62. The third pipe (inlet pipe 61 and outlet pipe 62) is open to the outside air. That is, in the third embodiment, the heat medium for cooling the magnet is cooled using outside air.

  FIG. 7 is a diagram schematically illustrating a heat exchanger according to the third embodiment. The heat exchanger 35 of the third embodiment is based on the configuration of the heat exchanger of the first embodiment. The heat exchanger 35 of the third embodiment is different from the first embodiment in that a third pipe (incoming pipe 61 and outgoing pipe 62) is mainly connected to the regenerator 35A.

  The regenerator 35A is connected to a third pipe (inlet side pipe 61 and outlet side pipe 62). The third pipe (inlet pipe 61 and outlet pipe 62) is open to the outside air. That is, outside air is led from the inlet side pipe 61 to the regenerator 35A. In the regenerator 35A, the outside air from the inlet side pipe 61 and the liquefied heat exchanger heat exchanger exchange heat. After the heat exchange, the outside air in the outlet side pipe 62 is released to the outside air. By this heat exchange, as in the first embodiment, the heat exchanger heat medium in the regenerator 35A evaporates.

  In order to efficiently evaporate the heat exchanger heat medium by the outside air, the third pipe (inlet pipe 61) preferably includes a compressor 63. In this case, the temperature of the outside air (heat medium) guided to the regenerator 35A is increased by being compressed. Therefore, the heat exchanger heat medium in the regenerator 35A is likely to evaporate. That is, the heat exchange efficiency is high.

  In the condenser 35B, the evaporator 35C, and the absorber 35D, heat exchange is performed by liquefying or vaporizing the heat exchanger heat medium as in the first embodiment. Thereby, as described above, the heat medium for cooling the magnet is cooled in the evaporator 35C.

  In short, in the heat generating apparatus 1 of the third embodiment, the outside air is guided to the heat exchanger 35. The heat of the outside air is utilized to cool the magnet cooling heat medium. The magnet 5 is cooled by the cooled magnet cooling heat medium. Therefore, as in the first embodiment, sufficient heat generation is obtained by the heat generating member 4. Moreover, since the temperature rise of the magnet 5 is also suppressed, the kinetic energy of the rotating shaft 3 can be effectively converted into heat energy and recovered.

  Such a magnet cooling mechanism can also be applied to the heat generating device 1 of the second embodiment.

  In each of the above embodiments, the magnets 5 are arranged in the circumferential direction around the rotation shaft 3, and the magnetic poles of the magnet 5 are arranged in the radial direction around the rotation shaft 3. However, the arrangement of the magnets 5 and the arrangement of the magnetic poles are not limited to the aspects of the above embodiment. For example, the arrangement of the magnetic poles of the magnets 5 arranged in the circumferential direction may be in the circumferential direction around the rotation axis 3. Even in this case, the arrangement of the magnetic poles is alternately different between the magnets 5 adjacent in the circumferential direction. Moreover, the arrangement | positioning of the magnet 5 may be arranged over an axial direction. In this case, the magnetic poles are arranged in the axial direction along the rotation axis 3. Even in this case, the arrangement of the magnetic poles differs between the magnets 5 adjacent in the axial direction.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the heat generating member 4 is formed in a cylindrical shape, but instead of this, it may be formed in a disk shape having the rotation shaft 3 as an axis. In this case, the magnet holding member 6 is also formed in a disk shape having the rotation shaft 3 as an axis. This disk member faces the main surface (one surface of both surfaces in the axial direction) of the disk-shaped heat generating member, and holds the magnet 5 on the surface facing this main surface. Thus, the magnet faces the main surface of the heat generating member with a gap. In this case, the arrangement forms of the magnets 5 are, for example, the following three types.

  In the first arrangement mode, the magnets are arranged over the circumferential direction around the rotation axis 3. The arrangement of the magnetic poles (N pole, S pole) of these magnets is alternately different in the axial direction and adjacent magnets in the circumferential direction. In this case, the material of the disk member that directly holds the magnet is a ferromagnetic material.

  In the second arrangement mode, the magnets are arranged over the circumferential direction around the rotation axis 3. Arrangement of magnetic poles (N pole, S pole) of these magnets is different in the circumferential direction and alternately in the magnets adjacent in the circumferential direction. In this case, the material of the disc member that directly holds the magnet is a non-magnetic material. A pole piece made of a ferromagnetic material is provided between magnets adjacent in the circumferential direction.

  In the third arrangement mode, the magnets are arranged concentrically over the radial direction around the rotation axis 3. Arrangement of magnetic poles (N pole, S pole) of these magnets is in the radial direction, and is alternately different between adjacent magnets in the radial direction. In this case, the material of the disc member that directly holds the magnet is a non-magnetic material. A pole piece made of a ferromagnetic material is provided between magnets adjacent in the radial direction. Furthermore, pole pieces are also provided at the ends of the magnets arranged at both ends in the radial direction.

  The heat generating device can be mounted not only on wind power generation equipment but also on power generation equipment using fluid kinetic energy such as hydroelectric power generation equipment.

  Further, the heat generating device can be mounted on a vehicle. In this case, the heat generating device described above may be provided separately from the eddy current type speed reducer as an auxiliary brake, or may be used as an auxiliary brake. When used also as an auxiliary brake, a switch mechanism for switching between braking and non-braking may be installed. The heat recovered by the heat generating device mounted on the vehicle is used, for example, as a heat source of a heater for heating the inside of the vehicle body or as a heat source of a refrigerator for cooling the inside of the container.

  The eddy current heating device of the present invention is useful for power generation equipment using fluid kinetic energy, such as wind power generation equipment and hydroelectric power generation equipment, and vehicles such as trucks and buses.

1: eddy current heating device, 2: body, 3: rotating shaft,
4: Heat generating member, 4A: Cylindrical member, 4B: Connecting member, 4C: Through hole,
5: permanent magnet, 6: magnet holding member, 6a: cylindrical member,
7: Bearing, 8: Cover,
11: Inlet, 12: Outlet, 13: Inlet, 14: Outlet,
15: partition wall, 20: impeller, 21: rotating shaft, 22: brake device,
23: clutch device, 24: speed increasing device, 25: bearing,
31: suction side piping, 32: discharge side piping, 35: heat storage device,
35A: regenerator, 35B: condenser, 35C: evaporator, 35D: absorber,
41: Inlet piping (first piping), 42: Outlet piping (first piping),
50: heat exchanger, 61: inlet side pipe (third pipe),
62: Outlet piping (third piping), 63: Compressor,
S1: 1st space, S2: 2nd space

Claims (3)

A rotating shaft rotatably supported by the non-rotating part;
A heat generating member fixed to the rotating shaft;
A plurality of permanent magnets opposed to each other with a gap between the heat generating members, and the magnetic poles alternately arranged with each other adjacent to each other,
A magnet holding member that holds the permanent magnet and is fixed to the non-rotating portion;
A sealed container that is fixed to the non-rotating portion and surrounds the heat generating member and the permanent magnet;
A non-magnetic partition that partitions the inside of the sealed container into a first space in which the heat generating member is present and a second space in which the permanent magnet is present;
A heat recovery mechanism for recovering heat generated in the heat generating member;
A cooling mechanism for cooling the permanent magnet,
The heat recovery mechanism is
A first pipe connected to each of an inlet and an outlet connected to the first space of the sealed container;
A heat storage device connected to each of the first pipes;
A heat storage heat medium that circulates through the first space, the first pipe, and the heat storage device,
The cooling mechanism is
A second pipe connected to each of an inlet and an outlet connected to the second space of the sealed container;
A heat exchanger connected to each first pipe and each second pipe;
A heat medium for cooling the magnet circulating in the second space, the second pipe, and the heat exchanger,
The heat exchanger is
A regenerator, a condenser, an evaporator, an absorber, and a cooling tower, and a heat exchanger heat exchanger that circulates through the regenerator, the condenser, the evaporator, and the absorber. ,
The regenerator evaporates the heat exchanger heat medium by heat exchange between the heat storage heat medium from the first pipe and the liquefied heat exchanger heat medium,
The evaporator is an eddy current heating device that evaporates the heat exchanger heat medium by heat exchange between the magnet cooling heat medium from the second pipe and the liquefied heat exchanger heat medium. A rotating shaft rotatably supported by the non-rotating part;
A heat generating member fixed to the non-rotating part;
A plurality of permanent magnets opposed to each other with a gap between the heat generating members, and the magnetic poles alternately arranged with each other adjacent to each other,
A magnet holding member that holds the permanent magnet and is fixed to the rotating shaft;
A sealed container that is fixed to the non-rotating portion and surrounds the heat generating member and the permanent magnet;
A non-magnetic partition that partitions the inside of the sealed container into a first space in which the heat generating member is present and a second space in which the permanent magnet is present;
A heat recovery mechanism for recovering heat generated in the heat generating member;
A cooling mechanism for cooling the permanent magnet,
The heat recovery mechanism is
A first pipe connected to each of an inlet and an outlet connected to the first space of the sealed container;
A heat storage device connected to each of the first pipes;
A heat storage heat medium that circulates through the first space, the first pipe, and the heat storage device,
The cooling mechanism is
A second pipe connected to each of an inlet and an outlet connected to the second space of the sealed container;
A heat exchanger connected to each first pipe and each second pipe;
A heat medium for cooling the magnet circulating in the second space, the second pipe, and the heat exchanger,
The heat exchanger is
A regenerator, a condenser, an evaporator, an absorber, and a cooling tower, and a heat exchanger heat exchanger that circulates through the regenerator, the condenser, the evaporator, and the absorber. ,
The regenerator evaporates the heat exchanger heat medium by heat exchange between the heat storage heat medium from the first pipe and the liquefied heat exchanger heat medium,
The evaporator is an eddy current heating device that evaporates the heat exchanger heat medium by heat exchange between the magnet cooling heat medium from the second pipe and the liquefied heat exchanger heat medium. The eddy current heating device according to claim 1 or 2,
In place of the first pipes, a pair of third pipes that are open to the outside air is connected to the heat exchanger,
The regenerator is an eddy current heating device that evaporates the heat exchanger heat medium by heat exchange between the outside air from each of the third pipes and the liquefied heat exchanger heat medium.

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