Heating device

Abstract

To provide a heating device having a simple structure and converting rotation energy into heat energy.SOLUTION: A heating device 1 includes: a sealed container 3 having a first annular stator 2 non-rotatably fixed to the inside; a fluid 5 filled in the sealed container; an annular pump 6 rotatably arranged confronting the first stator in the sealed container, and forming a spiral flow channel 7 of the fluid with the first stator; a power transmission shaft 8 non-rotatably supporting the pump at one end 8a, and connecting the other end 8b projecting from the sealed container to a power source 9 of rotational power; bearing members 17a, 17d supporting the power transmission shaft rotatably relative to the sealed container; a second stator 10 non-rotatably and removably fixed to the sealed container between the pump and the first stator; and a heat radiation part 4 disposed in an outer wall of the sealed container. Heat exchange is performed with a heat medium 11 by stirring the fluid in the spiral flow channel by power of the power source, and emitting heat of the fluid generated by fluid friction from the heat radiation part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a heat generating device comprising: a sealed container having a stator fixed therein so as not to rotate; a fluid filled in the sealed container; a pump rotatably disposed within the sealed container opposite the stator and forming a spiral flow path for the fluid between the stator and the pump; a power transmission shaft that supports the pump so as not to rotate at one end and connects the other end protruding from the sealed container to a power source that generates rotational power; and a bearing member that rotatably supports the power transmission shaft on the sealed container, the pump being rotated by the rotational power of the power source and the fluid in the sealed container being stirred, thereby converting rotational energy into thermal energy. [Background technology]

[0002] It is known, as disclosed in Patent Document 1, that such a heat generating device is connected to a power source such as a windmill or an axial flow water turbine to agitate a fluid filled in a sealed container, and the fluid heated by the agitation is extracted to the outside as thermal energy. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Jpn. Jpn. Published No. 58-49005 Summary of the Invention [Problem to be solved by the invention]

[0004] The device disclosed in the above Patent Document 1 is configured such that while a power transmission shaft 3 supporting a pump 5 at one end is rotated by the rotational power of a power source, water as a fluid is injected from an inlet 1c of a sealed container, and the water accelerated by the blades of the pump 5 collides with the blades 2a of the stator 2 in a spiral flow path, and the rotational energy of the pump 5 is converted into thermal energy by this collision to heat the water. The heated water flows out to the back side of the pump 5 in the sealed container through the gap between the stator 2 and the pump 5 by centrifugal force, and is discharged from an outlet 8, so that the rotational energy can be taken out to the outside as thermal energy.

[0005] However, this system requires a complex seal structure to prevent the pressurized water in the sealed container from leaking out of the power transmission shaft 3 into the bearings, which increases the number of parts and costs, and also has problems with thermal efficiency because the heated water is simply discharged to the outside. Moreover, when changing the characteristics of this system to suit a wide variety of wind turbines, the shape of the stator 2 or pump 5 must be significantly changed, which is not easy to do, and an increase in costs is unavoidable.

[0006] The present invention has been proposed in view of the above, and aims to provide a heat generating device which has a simple sealing structure, a reduced number of parts, excellent thermal efficiency, and whose characteristics can be easily adapted to a wide variety of wind turbines, etc. [Means for solving the problem]

[0007] In order to achieve the above object, a first feature of the present invention is a sealed container having a ring-shaped first stator fixed therein so as not to rotate, a fluid filled in the sealed container, an annular pump rotatably arranged inside the sealed container facing the first stator and forming a spiral flow path for the fluid between the first stator, a power transmission shaft supporting the pump non-rotatably at one end and connecting the other end protruding from the sealed container to a power source for rotational power, a bearing member rotatably supporting the power transmission shaft in the sealed container, a second stator fixed non-rotatably and removably to the sealed container between the pump and the first stator, and a heat dissipation unit provided on an outer wall of the sealed container, wherein the fluid in the spiral flow path is agitated by power from the power source, and heat of the fluid generated by fluid friction is released from the heat dissipation unit to perform heat exchange with an external heat medium.

[0008] In addition to the first feature, the present invention has a second feature in that the first and second stators each have a stator hub on their inner circumference, and the first stator hub of the first stator has an anti-rotation portion to which the second stator hub of the second stator can be removably fixed.

[0009] Furthermore, in addition to the first or second feature, the present invention has a third feature in that the first and second stators each have the same number of stator blades, and the second stator is removably fixed to the sealed container such that the second stator blades of the second stator can be attached in any phase relative to the first stator blades of the first stator.

[0010] Furthermore, in addition to the first or second characteristic, the present invention has a fourth characteristic in that the second stator has a plurality of second stator blades, the number of which is different from the number of first stator blades of the first stator, and is removably fixed to the sealed container.

[0011] Furthermore, in addition to the second feature, the present invention has a fifth feature in that the first stator is formed integrally with the sealed container, and the first stator hub has a seal portion that seals the fluid in the sealed container between the power transmission shaft and the first stator hub, and a bearing member for rotating the power transmission shaft within the sealed container.

[0012] In addition to the first feature, the present invention has a sixth feature in that the power transmission shaft extending parallel to the direction of gravity protrudes from the upper surface of the sealed container.

[0013] In addition to the first or sixth characteristic, the present invention has a seventh characteristic in that the heat dissipation portion overlaps at least a portion of the spiral flow path in the radial direction.

[0014] Furthermore, the present invention has an eighth feature in that, in addition to the first or sixth feature, the sealed container is stored in a hot water storage tank filled with a heat medium and sealed, the other end of the power transmission shaft protrudes from the hot water storage tank, a circulation piping is connected between the hot water storage tank and a heat exchanger arranged outside the hot water storage tank for circulating the heat medium between the hot water storage tank and the heat exchanger, and a plurality of stirring blades extending radially from the outer periphery of the power transmission shaft are attached to the power transmission shaft so as to cover at least a portion of the heat dissipation portion of the sealed container.

[0015] In addition to the eighth feature, the present invention has a ninth feature in that an extension portion of the circulation piping extending from the inlet of the circulation piping into the hot water storage tank opens on the inner side of the stirring impeller. Effect of the Invention

[0016] According to a first aspect of the present invention, a heat generating device in which an annular pump connected to a power source is opposed to an annular first stator fixed non-rotatably inside a sealed container, the annular pump is rotated by the rotational power of the power source to stir a fluid in a spiral flow path between the first stator and the pump, and the heat of the fluid generated by fluid friction is released from a heat dissipation section and exchanged with an external heat medium, is provided with a second stator in addition to the first stator, so that the resistance of the fluid increases and the rotational energy transmitted from the power source can be efficiently converted into thermal energy. Moreover, because the stirred fluid is sealed inside the sealed container, the sealing structure does not become complicated.

[0017] Furthermore, when a heat generating device is connected to a wind turbine, the efficiency of the wind turbine can be maximized by adjusting the pump capacity of the heat generating device so as to obtain a circumferential speed ratio (ratio of the tip speed of the wind turbine blades to the wind speed) that maximizes the power coefficient of the wind turbine. According to the first feature of the present invention, since the second stator is fixed non-rotatably and removably to the sealed container, it is possible to change the pump capacity to suit the characteristics of various wind turbines simply by changing the blades of the second stator, and it is possible to obtain a pump capacity suitable for a wide variety of wind turbines without changing the blade shapes of the pump and the first stator.

[0018] Moreover, since the heat generating device of the present invention has a fluid coupling structure in which the input torque is proportional to the square of the rotation speed, the output torque of the wind turbine connected to the power transmission shaft of the heat generating device can always be proportional to the square of the rotation speed of the wind turbine. Therefore, once the pump capacity of the heat generating device is adjusted to obtain a peripheral speed ratio that maximizes the power coefficient of the wind turbine, it is possible to obtain a peripheral speed ratio that maximizes the power coefficient at all times even if the wind speed changes, and therefore the wind turbine can always be operated at maximum efficiency without special control of the wind turbine.

[0019] According to a second feature of the present invention, the first and second stators each have a stator hub on their inner circumference, and the first stator hub of the first stator has an anti-rotation portion to which the second stator hub of the second stator can be removably fixed. This allows second stators of various shapes to be added with a simple configuration that does not increase weight or cost.

[0020] According to a third aspect of the present invention, the first and second stators each have the same number of stator blades, and the second stator blades of the second stator can be attached at any relative mounting angle (phase) to the first stator blades of the first stator. Therefore, by simply changing the phase of the second stator relative to the first stator, the pump capacity can be easily changed, making it easy to provide a heat generating device that is optimal for various wind turbines.

[0021] According to a fourth feature of the present invention, the second stator has a number of second stator blades different from the number of first stator blades possessed by the first stator, so that variation in pump capacity can be suppressed even if the mounting angle of the second stator relative to the first stator changes.

[0022] According to a fifth feature of the present invention, the first stator is formed integrally with the sealed container, and the first stator hub has a sealing portion that seals the fluid in the sealed container between the power transmission shaft and the first stator hub, and a bearing member for rotating the power transmission shaft within the sealed container.Therefore, the first stator hub can have a sealing function and a bearing function in addition to the function of holding the second stator, thereby contributing to making the heat-generating device more compact.

[0023] According to a sixth aspect of the present invention, the power transmission shaft extending parallel to the direction of gravity protrudes from the upper surface of the sealed container, so that the power transmission shaft can be disposed perpendicular to the ground. Therefore, the sealed container can be installed close to the ground or a building, and the support pillars for supporting the sealed container can be simplified, resulting in cost and weight reduction.

[0024] Furthermore, according to a seventh feature of the present invention, at least a portion of the heat dissipation section overlaps with the spiral flow path in the radial direction, so that the heat dissipation section can be brought closer to the spiral flow path, which is the heat source.As a result, when the sealed container is operated in a water tank or hot water storage tank, thermal conductivity from the sealed container to the heat medium in the water tank or hot water storage tank is improved, and the heat medium can be quickly heated.

[0025] According to an eighth aspect of the present invention, a sealed container is housed in a hot water storage tank filled with a heat medium and sealed, with the other end of the power transmission shaft protruding from the hot water storage tank, and a circulation pipe for circulating the heat medium between the hot water storage tank and the heat exchanger arranged outside the hot water storage tank is connected between the hot water storage tank and the heat exchanger, so that the heat of the sealed container generated by the rotation of the power transmission shaft can be sent to the heat exchanger outside the hot water storage tank by the heat medium filled in the hot water storage tank and the circulation pipe, and heat exchange can be performed. Moreover, a plurality of stirring blades extending radially from the outer periphery of the power transmission shaft are attached to the power transmission shaft outside the sealed container in the hot water storage tank so as to cover at least a part of the heat dissipation part of the sealed container, so that the rotation of the stirring blades attached to the power transmission shaft stirs the heat medium in the hot water storage tank, and heat dissipation from the sealed container can be promoted.

[0026] Furthermore, according to the ninth feature of the present invention, the rotation of the stirring blade attached to the power transmission shaft rotates the heat medium in the hot water storage tank, and the rotation of the heat medium creates high pressure on the outer periphery of the stirring blade and low pressure on the inner periphery, acting in the same way as a centrifugal pump, so that the extension of the circulation piping that extends from the inlet of the circulation piping to the hot water storage tank into the hot water storage tank is opened on the inner periphery of the stirring blade, making it possible to make the stirring blade perform a pumping action. This eliminates the need to provide a circulation pump in the middle of the circulation piping, which contributes to reducing the number of parts and simplifying the structure. [Brief description of the drawings]

[0027] [Figure 1] FIG. 1 is a vertical cross-sectional view that shows a schematic configuration of a heat generating device of a first embodiment when the heat generating device is installed in a water tank and connected to a vertical axis wind turbine and a heat exchanger. [Diagram 2] FIG. 2 is an enlarged view of part A in FIG. [Diagram 3] Fig. 3(A) is a schematic plan view showing the overlapping state of the first and second stator blades when the first and second stators in the heat generating device of the first embodiment are overlapped with the phases of the first and second stators aligned, Fig. 3(B) is a schematic plan view showing the overlapping state of the first and second stators when the phases of the first and second stators are different, and Fig. 3(C) is a graph showing the change in pump capacity τ with respect to the change in the phase of the two stators. [Figure 4] FIG. 4(A) is a schematic plan view showing the overlap of the first and second stator blades when the first and second stators are overlapped in the heat generating device of the second embodiment, and FIG. 4(B) is a graph showing the change in pump capacity τ with respect to the change in phase of both stators. [Diagram 5] FIG. 5 is a vertical cross-sectional view that shows a schematic configuration of a heat generating device according to a third embodiment when installed in a water tank. [Figure 6] FIG. 6 is a plan view that illustrates a stirring impeller according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] First to third embodiments of the present invention will be described below with reference to the accompanying drawings.

[0029] As shown in FIG. 1 and FIG. 2 which is an enlarged view of part A in FIG. 1, the heat generating device 1 of the first embodiment includes an annular first stator 2 having a plurality of first stator blades 2a arranged at equal intervals in the circumferential direction, an airtight container 3 in which the first stator 2 is fixed so as not to rotate, a fin-shaped heat dissipation section 4 provided on the outer wall of the airtight container 3, oil 5 as a liquid filled in the airtight container 3, an annular pump 6 having a plurality of blades 6a facing the first stator blades 2a of the first stator 2 and rotatably disposed in the airtight container 3, and forming a spiral flow path 7 for the oil 5 between the first stator 2 and the annular pump 6, a power transmission shaft 8 which supports a hub 6b of the pump 6 on one end 8a side so as not to rotate and connects the other end 8b protruding from the airtight container 3 to a windmill 9 as a power source for rotational power, and a second stator 10 which is fixed to the airtight container 3 so as to be non-rotatable and detachable between the pump 6 and the first stator 2.

[0030] The sealed container 3 is housed in a hot water storage tank 12 that is filled with a heat medium 11 such as water and is sealed, and is fixedly disposed on a floor 13 of a building or the like with the power transmission shaft 8 facing the direction of gravity, and is sealed by joining the upper half 3a and the lower half 3b. A circulation pipe 15 that circulates the heat medium 11 between the hot water storage tank 12 and the heat exchanger 14 is connected between the hot water storage tank 12 and the external heat exchanger 14, and a circulation pump (not shown) is interposed in the middle of the circulation pipe 15.

[0031] A pedestal 12b for fixing the sealed container 3 is fixed on the floor surface 12a of the hot water storage tank 12, and the heat medium 11 also flows between the upper surface of the pedestal 12b and the lower surface of the lower half 3b of the sealed container 3, and exchanges heat with the oil 5 inside the sealed container 3. The circulation piping 15 is attached to the side wall of the hot water storage tank 12 with the inlet 15a to the hot water storage tank 12 on the lower side and the outlet 15b from the hot water storage tank 12 on the upper side. A seal member 12c is arranged at the portion where the power transmission shaft 8 protrudes from the hot water storage tank 12.

[0032] 2, in this embodiment, the first stator 2 is formed in the upper half 3a of the sealed container 3 so as to constitute a part of the sealed container 3, and a first stator hub 2b of the first stator 2, which also serves as the hub of the sealed container 3, is formed in the center of the upper half 3a so as to allow the power transmission shaft 8 to rotatably pass through it. On the inner peripheral surface of the first stator hub 2b facing the power transmission shaft 8, a seal portion 16 that seals the oil 5 in the sealed container 3 between it and the power transmission shaft 8, and a bearing member 17a for rotating the power transmission shaft 8 within the sealed container 3 are arranged.

[0033] The second stator 10 has a second stator hub 10b on its inner periphery that surrounds the power transmission shaft 8 to be capable of relative rotation, and is disposed between the pump 6 and the first stator 2 such that the second stator hub 10b faces both the first stator hub 2b of the first stator 2 and the hub 6b of the pump 6. The second stator 10 has second stator blades 10a, the same number as the first stator blades 2a, that extend radially outward from the outer periphery of the second stator hub 10b, and the second stator blades 10a are disposed between the first stator blades 2a and the blades 6a of the pump 6.

[0034] A cylindrical portion 2c is formed in the axially innermost portion of the first stator hub 2b on the inner surface side of the sealed container 3 so as to surround the power transmission shaft 8 in a relatively rotatable manner, and an inwardly facing tubular portion 10c formed on the inner circumferential lower portion of the hub 10b of the second stator 10 is removably fitted into a stepped portion 2d formed by reducing the diameter of the lower end of the cylindrical portion 2c in the radially inward direction. A plurality of outwardly facing teeth 2e protruding radially outward are formed on the outer circumferential surface of the cylindrical portion 2c continuing from the stepped portion 2d of the first stator 2, and a plurality of inwardly facing teeth 10d protruding radially inward from the upper surface of the tubular portion 10c of the hub 10b are removably fixed to the outwardly facing teeth 2e. The outwardly facing teeth 2e and the inwardly facing teeth 10d constitute a rotation prevention portion for removably fixing the second stator hub 10b to the first stator hub 2b.

[0035] The outward teeth 2d of the first stator hub 2b and the inward teeth 10c of the second stator hub 10b are all formed with the same pitch. Therefore, after removing the inward teeth 10c of the second stator hub 10b from the outward teeth 2d of the first stator hub 2b, the relative mounting angle, i.e., the phase, between the first stator blades 2a of the first stator 2 and the second stator blades 10a of the second stator 10 can be changed by meshing and fitting these inward teeth 10c into other outward teeth 2d of the first stator hub 2b.

[0036] 3(A) and (B) are schematic plan views showing how the first and second stator blades 2a, 10a overlap when the first and second stators 2, 10 in the heat generating device 1 of the first embodiment are overlapped. Fig. 3(A) shows a state in which the first stator blades 2a of the first stator 2 and the second stator blades 10a of the second stator 10 are in phase, and Fig. 3(B) shows a state in which the first and second stator blades 2a, 10a are out of phase with each other. Moreover, the graph in FIG. 3(C) shows the relationship between the amount of phase angle shift of the second stator blades 10a relative to the first stator blades 2a and the pump capacity τ of the heat generating device 1. As is clear from the graph in FIG. 3(C), the smaller the phase shift of the first and second stator blades 2a, 10a, the larger the pump capacity τ of the heat generating device 1. Therefore, it is possible to change the pump capacity τ of the heat generating device 1 by temporarily removing the second stator hub 10b from the first stator hub 2b, changing the phase of the second stator blades 10a relative to the first stator blades 2a, and then reattaching the second stator hub 10b.

[0037] The hub 6b of the pump 6 is non-rotatably spline-fitted 6c onto the power transmission shaft 8, and the lower end of one end 8a of the power transmission shaft 8 is rotatably held by a bearing member 17d in an engagement hole 3c in the center of the lower half 3b of the sealed container 3. The lower surface of the hub 6b of the pump 6 is rotatably supported by a bearing member 17c arranged around the engagement hole 3c, and a bearing member 17b is also arranged between the upper surface of the hub 6b of the pump 6 and the lower surface of the second stator hub 10b of the second stator 10, so that the pump 6 is rotatably supported between the upper surface of the lower half 3b of the sealed container 3 and the lower surface of the second stator hub 10b.

[0038] The heat exchange device 14, which circulates the heat medium 11 such as water between the hot water storage tank 12, may be a snow melting hot water panel that directly uses thermal energy, or may be a heat engine that converts the thermal energy of a radiator or a heat medium into mechanical energy such as rotational energy. Furthermore, it may be a heat accumulator that stores the thermal energy of the heat medium. For example, in a device that converts the rotational energy of the windmill 9 into electrical energy and stores the generated electrical energy, it is necessary to use an expensive storage battery. However, a heat accumulator is cheaper than a storage battery and does not need to worry about discharging, so storing the rotational energy in a heat accumulator as thermal energy can be an effective energy storage means.

[0039] In this embodiment, the power transmission shaft 8 extending upward in the direction of gravity from the sealed container 3 is directly connected to the vertical shaft 9a of the vertical-axis wind turbine 9, but the direction in which the power transmission shaft 8 extends may be horizontal, and the shape of the wind turbine 9 is not particularly limited to the vertical axis type. Furthermore, a power source other than a wind turbine, such as a water turbine, may be used as long as it generates rotational power.

[0040] In the heat generating device 1 of the present embodiment thus configured, the power transmission shaft 8 connected to the windmill 9 rotates by the power of the windmill 9, and a spiral flow of the oil 5 occurs between the blades 6a of the pump 6 and the blades 2a, 10a of the first and second stators 2, 10, similar to that of a normal fluid coupling. However, unlike a normal fluid coupling, the blades 2a, 10a of the first and second stators 2, 10 are fixed to the sealed container 3 fixedly disposed on the floor 13 of a building or the like so as not to be rotatable, so that the oil 5 is stirred between the blades 6a of the pump 6 and the blades 2a, 10a of the first and second stators 2, 10, and heat is generated by fluid friction, causing the temperature of the oil 5 to rise. The oil 5 with the increased temperature is cooled by heat exchange with the heat medium 11 filled in the hot water storage tank 12 through the fin-shaped heat dissipation section 4 provided on the outer wall of the sealed container 3, while the heat medium 11 in the hot water storage tank 12 is sent to the heat exchanger 14 by a circulation pump (not shown) and heat exchange occurs between the oil 5 and the heat exchanger 14.

[0041] When wind energy is converted into mechanical power by the wind turbine 9, it is desirable to maximize the power coefficient Cp, which is the conversion efficiency. The power coefficient Cp of the wind turbine 9 changes parabolically in response to the circumferential speed ratio λ, which is the ratio (Vr / V) of the tip speed Vr of the wind turbine blades 9b to the wind speed V, and so there is a circumferential speed ratio λ at which the power coefficient Cp is maximized midway through the change. Therefore, when the heat generating device 1 is connected to the wind turbine 9, the wind turbine efficiency can be maximized by adjusting the pump capacity τ of the heat generating device 1 so as to obtain the circumferential speed ratio λ at which the power coefficient Cp of the wind turbine 9 is maximized.

[0042] Incidentally, in a conventional wind turbine that does not use a fluid coupling to convert the rotational energy of the wind turbine 9, when the wind speed V changes, the wind turbine rotation speed N changes, which changes the tip speed ratio λ. Therefore, even if the tip speed ratio λ that maximizes the power coefficient Cp is obtained at a specific wind speed V, the tip speed ratio λ that maximizes the power coefficient Cp cannot be obtained when the wind speed V changes. For this reason, it was necessary to deal with changes in the wind speed V by using pitch control, adding a gearbox, or controlling the load on the generator. However, in the present invention, the rotational energy of the wind turbine 9 is converted into thermal energy by the heat generating device 1 that uses a fluid coupling, so that the tip speed ratio λ that maximizes the power coefficient Cp can always be obtained even if the wind speed V changes. The reason for this is explained below.

[0043] The output power E of a wind turbine is given by the following equation, where Cp is the power coefficient, ρ is the air density, A is the pressure-receiving area of ​​the blade, and V is the wind speed. E=Cp×(1 / 2)×ρ×A×V 3 ...(1) It can be expressed as: Here, d is the diameter of the rotor blade, λ is the tip speed ratio, Vr is the tip speed of the wind turbine blade, and N is the rotation speed of the wind turbine. V=Vr / λ Vr=πdN / 60 Since, V=πdN / 60λ Therefore, equation (1) can be expressed as follows: E=Cp×(1 / 2)×ρ×A×(πdN / 60λ) 3 ...(2) Furthermore, if the output torque of the wind turbine is T, the output torque T is expressed as follows: T = 60E / 2πN (3) Therefore, from equations (2) and (3), the relationship between T and N can be expressed as follows: T=60×(Cp×(1 / 2)×ρ×A×(πdN / 60λ) 3 / 2πN = {(Cp × ρ × A × π 2 d 3 ) / (4×60 2 ×λ 3 )}×N 2 ...(4) It can be expressed as:

[0044] Equation (4) is (Cp×ρ×A×π 2 d 3 ) / (4×60 2 ×λ 3 ) is constant, the output torque T of the wind turbine 9 is proportional to the square of the rotation speed N of the wind turbine 9. However, conversely, if the output torque T of the wind turbine 9 is made proportional to the square of the rotation speed N of the wind turbine 9, then (Cp×ρ×A×π 2 d 3 ) / (4×60 2 ×λ 3 ) is a proportional constant and is fixed at a constant value, that is, T ∝ N 2 If so, it also shows that the correspondingly changing power coefficient Cp and circumferential speed ratio λ can be fixed to constant values ​​regardless of the wind speed V. However, as is well known, the input torque of a fluid coupling is proportional to the square of the rotation speed N, so by using a fluid coupling as the heat generating device 1, the output torque T of the wind turbine 9 connected to the power transmission shaft 8 of the heat generating device 1 can be made proportional to the square of the rotation speed N of the wind turbine 9. Therefore, by using a fluid coupling as the heat generating device 1 and adjusting the pump capacity τ of the heat generating device 1 to obtain the circumferential speed ratio λ at which the power coefficient Cp of the wind turbine 9 is maximized, it is possible to obtain the circumferential speed ratio λ at which the power coefficient Cp is always maximized even if the wind speed V changes.

[0045] When the heat generating device 1 of this embodiment is applied to a wind turbine 9 with different characteristics, it is conceivable that the pump capacity τ of the heat generating device 1 does not match the characteristics of that wind turbine, making it impossible to obtain the peripheral speed ratio λ that maximizes the power coefficient Cp of the wind turbine 9. However, in this embodiment, the first and second stators 2, 10 each have the same number of stator blades 2a, 10a, and the second stator 10 can be attached with the second stator blades 10a of the second stator 10 in any phase relative to the first stator blades 2a of the first stator 2. Therefore, by simply changing the relative mounting angle (phase) of the second stator 10 to the first stator 2, the pump capacity τ can be easily changed, making it possible to easily provide a heat generating device that is optimal for a variety of wind turbines.

[0046] Next, the operation of the first embodiment of the present invention having the above configuration will be described.

[0047] In this embodiment, an annular pump 6 connected to a windmill 9 is opposed to an annular first stator 2 fixed unrotatably inside a sealed container 3, and the annular pump 6 is rotated by the rotational power of the windmill 9 to agitate the oil 5 in a spiral flow path 7 between the first stator 2 and the pump 6, and the heat of the oil 5 generated by fluid friction is released from a heat dissipation section 4 to perform heat exchange with an external heat medium 11. Since the heat generating device 1 includes a second stator 10 in addition to the first stator 2, the resistance of the oil 5 increases, and the rotational energy transmitted from the windmill 9 can be efficiently converted into thermal energy. Moreover, since the oil 5 to be agitated is sealed inside the sealed container 3, the sealing structure does not become complicated.

[0048] Furthermore, when the heat generating device 1 is connected to the wind turbine 9, the wind turbine efficiency can be maximized by adjusting the pump capacity τ of the heat generating device 1 so as to obtain a circumferential speed ratio λ (the ratio of the tip speed Vr of the wind turbine blades 9b to the wind speed V) at which the power coefficient Cp of the wind turbine 9 is maximized. In the first embodiment of the present invention, the second stator 10 is fixed to the sealed container 3 unrotatably and removably, so that the pump capacity τ can be changed to suit the characteristics of various wind turbines 9 simply by changing the second stator blades 10a of the second stator 10. This makes it possible to obtain a pump capacity τ that is suitable for a wide variety of wind turbines 9 without changing the blade shapes of the pump 6 and the first stator 2.

[0049] Moreover, since the heat generation device 1 of the first embodiment has a fluid coupling structure in which the input torque T is proportional to the square of the rotation speed N, the output torque of the wind turbine 9 connected to the power transmission shaft 8 of the heat generation device 1 can be always proportional to the square of the rotation speed of the wind turbine 9. Therefore, once the pump capacity τ of the heat generation device 1 is adjusted to obtain the peripheral speed ratio λ at which the power coefficient Cp of the wind turbine 9 is maximized, it is possible to obtain the peripheral speed ratio λ at which the power coefficient Cp is always maximized even if the wind speed V changes. Therefore, the wind turbine 9 can always be operated at maximum efficiency without performing any special control on the wind turbine 9.

[0050] In addition, the first and second stators 2, 10 each have a stator hub 2b, 10b on its inner circumference, and the first stator hub 2b of the first stator 2 has outward teeth 2d and inward teeth 10c as anti-rotation parts that can removably fix the second stator hub 10b of the second stator 10. Therefore, the second stator 10 of various shapes can be attached and removed with a simple configuration that does not increase weight or cost.

[0051] Moreover, the first and second stators 2, 10 each have the same number of stator blades 2a, 10a, and the second stator 10 can be attached with the second stator blades 10a of the second stator 10 in any phase relative to the first stator blades 2a of the first stator 2. Therefore, by simply changing the relative mounting angle (phase) of the second stator 10 with respect to the first stator 2, the pump capacity τ can be easily changed, and the heat generating device 1 optimal for various wind turbines 9 can be easily provided.

[0052] In addition, the first stator 2 is formed integrally with the sealed container 3, and the first stator hub 2b has a seal portion 16 that seals the oil 5 in the sealed container 3 between it and the power transmission shaft 8, and a bearing member 17a for rotating the power transmission shaft 8 within the sealed container 3. Therefore, the first stator hub 2b can have a sealing function and a bearing function in addition to the function of holding the second stator 10, which can contribute to making the heat generating device 1 more compact.

[0053] In addition, the power transmission shaft 8 extending parallel to the direction of gravity protrudes from the upper surface of the sealed container 3, so that the power transmission shaft 8 can be arranged perpendicular to the ground. This allows the sealed container 3 to be installed close to the ground or the floor 13 of a building, simplifies the support pillars that support it, and reduces costs and weight.

[0054] In addition, since at least a portion of the heat dissipation section 4 overlaps with the spiral flow path 7 in the radial direction, the heat dissipation section 4 can be brought closer to the spiral flow path 7, which is the heat source. Therefore, when the sealed container 3 is operated within the hot water storage tank 12, the thermal conductivity from the sealed container 3 to the heat medium 11 in the hot water storage tank 12 is improved, and the heat medium 11 can be quickly heated.

[0055] Next, a heating device according to a second embodiment of the present invention will be described with reference to FIG.

[0056] 4(A) is a schematic plan view showing the overlapping state of the first and second stator blades 2a, 10a when the first and second stators 2, 10 of the second embodiment of the present invention are overlapped. As shown in this figure, the heat generating device 1 of the second embodiment of the present invention differs from the heat generating device 1 of the first embodiment only in that the number of second stator blades 10a of the second stator 10 removably fixed to the sealed container 3 is different from the number of first stator blades 2a of the first stator 2, and therefore, when the first and second stators 2, 10 are overlapped, the first and second stator blades 2a, 10a are configured to overlap in various positional relationships regardless of the relative mounting angle (phase).

[0057] 4B shows the relationship between the amount of phase angle shift of the second stator blade 10a relative to the first stator blade 2a in the second embodiment and the pump capacity τ of the heat generating device 1. As is clear from this graph, in the second embodiment, the pump capacity τ is substantially constant regardless of the phase in which the first and second stators 2, 10 are overlapped, and the pump capacity τ is prevented from changing due to the difference in phase. Therefore, if the second stator blade 10a of the second stator 10 is formed in a predetermined shape that obtains a specific pump capacity τ, even if there is a slight deviation in the mounting angle between the first and second stator hubs 2b, 10b, the pump capacity τ of the sealed container 3 does not change when the second stator hub 10b is attached to the first stator hub 2b, and the predetermined pump capacity τ can be reliably obtained.

[0058] Next, a heating device according to a third embodiment of the present invention will be described with reference to FIGS.

[0059] As shown in Fig. 5, in the heat generating device 1 of the third embodiment of the present invention, a plurality of stirring blades 18 extending radially from the outer periphery of a power transmission shaft 8 are attached to the power transmission shaft 8 outside a sealed container 3 in a hot water storage tank 12. The stirring blades are formed in a shape similar to the impeller of a centrifugal pump as shown in Fig. 6, and cover at least a part of the heat dissipation section 4 of the sealed container 3 (the entire heat dissipation section 4 in this embodiment). In addition, as shown in FIG. 5, the circulation piping 15 on the side of the inlet 15a to the hot water storage tank 12 extends from the inlet 15a to the hot water storage tank 12 into the inside of the hot water storage tank 12, enters the base 12b from between the upper surface of the base 12b and the lower surface of the lower half 3b of the sealed container 3, passes through the center of the lower half 3b of the sealed container 3 and inside the power transmission shaft 8, and its tip 15c opens at the inner peripheral part of the agitator impeller 18 (at this time, a sealing member not shown is interposed between the base 12b and the center of the lower half 3b of the sealed container 3 and the power transmission shaft 8).

[0060] In this way, the agitator 18 attached to the power transmission shaft 8 rotates to agitate the heat medium 11 in the hot water storage tank 12, and not only can the heat radiation from the sealed container 3 be promoted, but also the rotational movement of the heat medium 11 in the hot water storage tank 12 causes the outer periphery of the agitator 18 to be at high pressure and the inner periphery to be at low pressure, as in a centrifugal pump, so that the agitator 18 can function as a pump. Therefore, even if a circulation pump is not provided in the middle of the circulation pipe 15, the heat medium 11 in the circulation pipe 15 that flows out from the tip 15c of the circulation pipe 15 that opens to the inner periphery of the agitator 18 can be sent to the circulation pipe 15 from the outlet 15b formed on the peripheral wall of the hot water storage tank 12 while being agitated in the hot water storage tank 12, and circulated. This eliminates the need to provide a special circulation pump in the middle of the circulation pipe 15, which can contribute to reducing the number of parts and simplifying the structure.

[0061] In this embodiment, the agitator 18 is fixed to the power transmission shaft 8 with bolts 18a, but the fixing method is not particularly limited. In this embodiment, the circulation pipe 15 is opened from the lower surface of the lower half 3b of the sealed container 3 through the inside of the power transmission shaft 8 to the inner periphery side of the agitator 18, but the pipe extending from the inlet 15a of the circulation pipe 15 to the hot water storage tank 12 into the hot water storage tank may be led directly to the inner periphery side of the agitator 18 in the hot water storage tank 12 and opened on the inner periphery side of the agitator 18. In that case, no seal member is required between the base 12b and the center of the lower half 3b of the sealed container 3 and the power transmission shaft.

[0062] Although the embodiment of the present invention has been described above, various design changes can be made to the present invention without departing from the gist of the invention. For example, in the embodiment, oil 5 is used as the liquid filled in the sealed container 3, but this liquid may be another liquid such as water. As described above, the direction in which the power transmission shaft 8 extends may be horizontal, and the power source is not limited to the windmill 9. Furthermore, various types of heat exchanger 14 can be selected. [Explanation of symbols]

[0063] 1. Heating device 2. First stator 2a 1st stator blade 2b First stator hub 3. Sealed container 4...Heat dissipation part 5. Oil as a fluid filled in a sealed container 6. Pump 7...Spiral flow path 8. Power transmission shaft 8a...One end 8b...Other end 9. Windmills as a power source 10 Second stator 10a Second stator blade 10b Second stator hub 11. Heat transfer medium 12...Hot water tank 14...Heat exchange equipment 15...Circulation piping 15a: Circulation piping entrance to hot water tank 16 Seal part 17a to 17d Bearing parts 18... Stirring blade

Claims

1. a sealed container having an annular first stator fixed therein so as not to rotate; A fluid filled in the sealed container; an annular pump that is rotatably disposed inside the sealed container facing the first stator and forms a spiral flow path for the fluid between the annular pump and the first stator; a power transmission shaft that supports the pump at one end so as not to rotate and that connects the other end protruding from the sealed container to a power source for generating rotational power; a bearing member that rotatably supports the power transmission shaft in the sealed container; a second stator fixed non-rotatably and removably to the sealed container between the pump and the first stator; A heat dissipation portion provided on an outer wall of the sealed container, A heat generating device characterized in that the fluid in the spiral flow path is agitated by the power of the power source, and heat of the fluid generated by fluid friction is released from the heat dissipation section to perform heat exchange with an external heat medium.

2. The heating device according to claim 1 , A heat generating device characterized in that the first and second stators each have a stator hub on their inner periphery, and the first stator hub of the first stator has a rotation prevention portion to which the second stator hub of the second stator can be removably fixed.

3. The heating device according to claim 1 or 2, a heat generating device characterized in that the first and second stators each have the same number of stator blades, and the second stator is removably fixed to the sealed container such that the second stator blades of the second stator can be attached at any phase relative to the first stator blades of the first stator.

4. The heating device according to claim 1 or 2, The second stator has a plurality of second stator blades, the number of which is different from the number of first stator blades of the first stator, and is removably fixed to the sealed container.

5. The heating device according to claim 2, a heat generating device characterized in that the first stator is formed integrally with the sealed container, and the first stator hub has a seal portion that seals the fluid in the sealed container between the power transmission shaft and the first stator hub, and a bearing member for rotating the power transmission shaft within the sealed container.

6. The heating device according to claim 1 , A heat generating device, wherein the power transmission shaft extends parallel to the direction of gravity and protrudes from an upper surface of the sealed container.

7. The heating device according to claim 1 or 6, A heat generating device, wherein the heat dissipation portion overlaps at least a portion of the spiral flow path in a radial direction.

8. The heating device according to claim 1 or 6, The heat generating device is characterized in that the sealed container is stored in a hot water storage tank filled with a heat medium, the other end of the power transmission shaft protrudes from the hot water storage tank, and a circulation piping is connected between the hot water storage tank and a heat exchanger arranged outside the hot water storage tank for circulating the heat medium between the hot water storage tank and the heat exchanger, and a plurality of stirring blades extending radially from the outer periphery of the power transmission shaft are attached to the power transmission shaft outside the sealed container within the hot water storage tank so as to cover at least a portion of the heat dissipation portion of the sealed container.

9. The heating device according to claim 8, A heat generating device, characterized in that an extension portion of the circulation piping extending from an inlet of the circulation piping to the hot water storage tank into the hot water storage tank opens on the inner peripheral side of the agitating blade.

Images