JP2013249857A - Magnetic coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent degradation of magnetic force to a driven magnet of a driving magnet, even if applied to a magnetic coupling which transmits the rotation of a power turbine to a reduction gear, and to normally transmit a drive force, for example, in a waste heat recovery power generation device constituting a waste heat recovery type ship propelling device arranged for recovering the waste heat of a diesel engine (internal combustion engine) as a ship propelling main machine.SOLUTION: An outside holding ring 101 which exhibits a ring shape in a plane view and is composed of fiber reinforced plastic is attached to the outer peripheral surface of a circumferential wall 82 of an outer yoke 83.

Description

  The present invention relates to a magnetic coupling, for example, a magnetic coupling that transmits the rotation of a turbine to a reduction gear.

  As a magnetic coupling for transmitting the driving force of the driving source to the rotating machine in a non-contact manner, for example, the one disclosed in Patent Document 1 is known.

JP 2008-164095 A

  However, in the exhaust heat recovery power generator that constitutes the exhaust heat recovery ship propulsion device installed for exhaust heat recovery of the diesel engine as the main engine for ship propulsion, the magnetic coupling that transmits the rotation of the power turbine to the speed reducer is Since the transmission torque is large, the transmission torque is increased and the power turbine rotates at a high speed (for example, 3000 rotations or more). Therefore, even if the magnetic coupling disclosed in Patent Document 1 is applied as the magnetic coupling for transmitting the rotation of the power turbine to the speed reducer in the exhaust heat recovery power generator, the coupling member constituting the magnetic coupling A large centrifugal force acts on the (outer rotor), the coupling member (outer rotor) expands radially outward, the distance between the driving magnet and the driven magnet increases, and the magnetic force of the driving magnet on the driven magnet is increased. There is a risk that the driving force may not be normally transmitted due to weakening.

  Further, in the exhaust heat recovery power generation device constituting the exhaust heat recovery type ship propulsion device installed for exhaust heat recovery of a diesel engine as a main engine for ship propulsion, the output rotational speed of the power turbine is, for example, about 10,000 revolutions / It is estimated that the magnetic coupling that transmits the rotation of the power turbine to the speed reducer generates heat due to windage and the like, and the heat generation amount is about several kW. Therefore, even if the magnetic coupling disclosed in Patent Document 1 is applied as the magnetic coupling that transmits the rotation of the power turbine to the speed reducer in the exhaust heat recovery power generator, the amount of heat generated in the magnetic coupling is too large. As a result, the magnetic coupling becomes insufficiently cooled, and the distance between the driving magnet provided on the outer peripheral surface of the coupling member (inner rotor) and the separating wall disposed radially outside the driving magnet is reduced. In extreme cases, the driving magnet and the isolation wall come into contact with each other and the magnetic coupling is damaged, or the distance between the driving magnet and the driven magnet provided on the inner peripheral surface of the coupling member (outer rotor) is large. Thus, the magnetic force of the driving magnet with respect to the driven magnet becomes weak, and there is a possibility that the driving force cannot be normally transmitted.

  Furthermore, in the exhaust heat recovery power generator that constitutes the exhaust heat recovery ship propulsion device installed for exhaust heat recovery of the diesel engine as the main engine for ship propulsion, the magnetic coupling that transmits the rotation of the power turbine to the speed reducer is And the power turbine will rotate at a high speed (for example, about 10,000 revolutions / minute). Therefore, even if the magnetic coupling disclosed in Patent Document 1 is applied as the magnetic coupling for transmitting the rotation of the power turbine to the speed reducer in the exhaust heat recovery power generator, the coupling member constituting the magnetic coupling A large centrifugal force acts on the (inner rotor), and the driving magnet attached (attached) to the outer peripheral surface of the coupling member (inner yoke) is peeled off and scattered outward in the radial direction. There is a risk that it will break.

  The present invention has been made to solve the above-described problems, and constitutes, for example, an exhaust heat recovery type ship propulsion device installed for exhaust heat recovery of a diesel engine (internal combustion engine) as a main engine for ship propulsion. In the exhaust heat recovery power generator, when applied to the magnetic coupling that transmits the rotation of the power turbine to the speed reducer, the magnetic force of the driving magnet to the driven magnet is prevented from being weakened, and the driving force is transmitted normally. The purpose is to do so.

The present invention employs the following means in order to solve the above problems.
In the magnetic coupling according to the present invention, magnets serving as N poles and magnets serving as S poles are alternately arranged along the circumferential direction on the peripheral edge of the disc-shaped inner yoke and serve as a driving side. The peripheral wall portion of the outer yoke having an inner rotor fixed to the first rotation shaft and rotating together with the first rotation shaft, a bottom portion having a circular shape in plan view, and a peripheral wall portion having a ring shape in plan view On the inner peripheral surface, magnets serving as N poles and magnets serving as S poles are alternately arranged along the circumferential direction, and the second rotation serving as a driven side with respect to the first rotating shaft. An outer rotor fixed to a shaft and rotating together with the second rotating shaft, wherein the outer yoke has an annular shape on the outer peripheral surface of the peripheral wall portion, and a fiber An outer retaining ring made of reinforced plastic Ri is attached.

According to the magnetic coupling according to the present invention, for example, in the exhaust heat recovery power generation device constituting the exhaust heat recovery type ship propulsion device installed for exhaust heat recovery of a diesel engine (internal combustion engine) as a main engine for ship propulsion. Even if a large centrifugal force is applied to the coupling member (outer rotor) constituting the magnetic coupling applied to the magnetic coupling that transmits the rotation of the power turbine to the speed reducer, the coupling member (outer rotor) Expansion to the outside in the radial direction is prevented, and expansion of the interval between the driving magnet and the driven magnet is prevented.
Thereby, it can prevent that the magnetic force with respect to the driven magnet of a drive magnet becomes weak, and can make a drive force transmit normally.

  In the magnetic coupling, a spacer including a bottom portion having a circular shape in plan view and a peripheral wall portion having a ring shape in plan view has a bottom surface of the bottom portion of the spacer and a top surface of the bottom portion of the outer yoke. In contact with the outer peripheral surface of the peripheral wall portion of the spacer and the inner peripheral surface of the peripheral wall portion of the outer yoke, and the bottom portion of the spacer is provided with the bottom portion of the outer yoke. It is further preferable that a through hole for accommodating the whole nut of the bolt and the nut that couples to the second rotating shaft is provided.

According to such a magnetic coupling, the windage loss due to the nut rotating with the outer yoke and the second rotating shaft is reduced.
Thereby, the heat generated by windage can be reduced, and the amount of heat generated in the magnetic coupling can be reduced.

  In the magnetic coupling, the bottom of the spacer and the bottom of the outer yoke have a cooling hole that communicates an internal space formed inside the outer yoke with an external space existing outside the outer yoke. It is more preferable that is provided.

According to such a magnetic coupling, high-temperature air existing in the internal space is discharged out of the outer yoke through the cooling hole.
Thereby, the temperature in the internal space can be reduced, the temperature rise of the magnetic coupling is suppressed, the magnetic force of each magnet is suppressed from being weakened, and the strength reduction of the constituent members is prevented. Can do.

  In the magnetic coupling, a magnet presser having a ring shape in plan view is in contact with the N pole magnet and the end face of the S pole magnet arranged on the inner peripheral surface of the peripheral wall portion of the outer yoke. It is more preferable that the outer peripheral edge portion disposed on the outer side in the radial direction of the magnet press and the inner peripheral surface of the peripheral wall portion of the outer yoke are coupled to each other.

  According to such a magnetic coupling, it is possible to avoid the bolt connection between the magnet presser and the peripheral wall constituting the outer yoke, and when the connection between the magnet presser and the peripheral wall constituting the outer yoke is a bolt connection Stress concentration on the bolt can be avoided.

  In the magnetic coupling described above, an inner holding made of a fiber-reinforced plastic and having a hollow cylindrical shape on the outer peripheral surface of the magnet serving as the N pole and the magnet serving as the S pole arranged at the peripheral edge of the inner yoke. More preferably, a ring is attached.

According to such a magnetic coupling, for example, in the exhaust heat recovery power generation apparatus constituting the exhaust heat recovery type ship propulsion device installed for exhaust heat recovery of a diesel engine (internal combustion engine) as a main engine for ship propulsion, Applied to the magnetic coupling that transmits the rotation of the power turbine to the speed reducer, a large centrifugal force acts on the coupling member (inner rotor) constituting the magnetic coupling, and the outer circumferential surface of the coupling member (inner rotor) Even if the attached driving magnet is peeled off, scattering of the driving magnet to the outside in the radial direction is prevented.
As a result, it is possible to prevent the magnetic coupling from being damaged due to the driving magnets scattering outward in the radial direction.

  In the magnetic coupling described above, it is more preferable that a predetermined gap is provided between the front end surface of the peripheral wall portion of the spacer and the end surfaces of the N pole magnet and the S pole magnet. .

According to such a magnetic coupling, the heat of these magnets is generated by a predetermined gap provided between the front end surface of the peripheral wall constituting the spacer and the end surface of the magnet that becomes the N pole and the magnet that becomes the S pole. Elongation will be absorbed.
Thereby, the thermal expansion of the magnet which becomes the N pole and the magnet which becomes the S pole can be allowed, and the breakage of the magnetic coupling due to the thermal extension of these magnets can be prevented.

  An exhaust heat recovery apparatus according to the present invention is installed in parallel with an internal combustion engine of a ship and a circulation path of a working medium, and includes a plurality of evaporators that evaporate the working medium with heat media having different temperatures, and the evaporator. A turbine driven by the vaporized working medium; a generator that generates electric power by rotational output of the turbine; a condenser that condenses the working medium that has passed through the turbine; and rotation of the turbine, A magnetic coupling for transmission to a speed reducer disposed between the generator and a flash chamber or a heat exchanger for evaporating and evaporating the working medium that has passed through the condenser, wherein the magnetic coupling is It is considered as magnetic coupling.

According to the exhaust heat recovery apparatus according to the present invention, for example, in an exhaust heat recovery power generation apparatus that constitutes an exhaust heat recovery apparatus installed for exhaust heat recovery of a diesel engine (internal combustion engine) as a main engine for ship propulsion, Even when applied to a magnetic coupling that transmits the rotation of the turbine to the speed reducer, the magnetic force of the driving magnet against the driven magnet is prevented from being weakened, and the magnetic coupling is provided to transmit the driving force normally. Will be.
Thereby, exhaust heat recovery efficiency can be improved and energy saving can be improved.

  An exhaust heat recovery type ship propulsion device according to the present invention includes the above exhaust heat recovery device.

According to the exhaust heat recovery type ship propulsion apparatus according to the present invention, for example, the exhaust heat constituting the exhaust heat recovery type ship propulsion apparatus installed for exhaust heat recovery of a diesel engine (internal combustion engine) as a main engine for ship propulsion. Even when applied to a magnetic coupling that transmits the rotation of the power turbine to the speed reducer in the recovery power generation device, the magnetic force on the driven magnet of the driving magnet is prevented from being weakened, and the driving force is normally transmitted. A magnetic coupling is provided.
Thereby, exhaust heat recovery efficiency can be improved and energy saving can be improved.

  A ship according to the present invention includes the exhaust heat recovery type ship propulsion apparatus.

  According to the ship according to the present invention, since the exhaust heat recovery power generation device is provided, the exhaust heat recovery efficiency can be improved, and the energy saving property can be improved.

  According to the magnetic coupling according to the present invention, for example, in the exhaust heat recovery power generation device constituting the exhaust heat recovery type ship propulsion device installed for exhaust heat recovery of a diesel engine (internal combustion engine) as a main engine for ship propulsion. Even when applied to a magnetic coupling that transmits the rotation of the power turbine to the speed reducer, the magnetic force of the driving magnet to the driven magnet is prevented from being weakened so that the driving force is transmitted normally. There is an effect that can be.

It is a schematic block diagram of the waste heat recovery type | formula ship propulsion apparatus which comprised the magnetic coupling which concerns on this invention. It is sectional drawing which expands and shows the part of the magnetic coupling which concerns on 1st Embodiment of this invention, (power) turbine, a reduction gear, and a flexible coupling. It is the figure which looked at the magnetic coupling which concerns on 1st Embodiment of this invention from the (power) turbine side. FIG. 4 is a cross-sectional view of FIG. 3 taken along a plane including the rotation axis of the inner rotor. It is the figure which looked at the inner rotor which comprises the magnetic coupling which concerns on 1st Embodiment of this invention from the radial direction outer side. It is AA arrow sectional drawing of FIG. It is the figure which looked at the magnetic coupling which concerns on 2nd Embodiment of this invention from the (power) turbine side. FIG. 8 is a cross-sectional view of FIG. 7 taken along a plane including the rotation axis of the inner rotor. It is sectional drawing of the inner rotor shown in FIG. It is the figure which looked at the inner rotor which comprises the magnetic coupling which concerns on 3rd Embodiment of this invention from the radial direction outer side. It is the figure which looked at the inner rotor which comprises the magnetic coupling which concerns on 4th Embodiment of this invention from the (power) turbine side. It is the figure which looked at the inner rotor shown in FIG. 11 from the radial direction outer side. It is the figure which looked at the inner rotor which comprises the magnetic coupling which concerns on 5th Embodiment of this invention from the (power) turbine side. It is the figure which looked at the inner rotor shown in FIG. 13 from the radial direction outer side. It is the figure which looked at the inner rotor which comprises the magnetic coupling which concerns on 6th Embodiment of this invention from the (power) turbine side. It is the figure which looked at the inner rotor shown in FIG. 15 from the radial direction outer side. It is BB arrow sectional drawing of FIG. It is the figure which looked at the inner rotor which comprises the magnetic coupling which concerns on 7th Embodiment of this invention from the (power) turbine side. It is the figure which looked at the inner rotor shown in FIG. 18 from the radial direction outer side. It is CC sectional view taken on the line of FIG.

[First Embodiment]
Hereinafter, the exhaust heat which comprises the magnetic coupling which concerns on 1st Embodiment of this invention, for example, the waste heat recovery type | formula ship propulsion apparatus installed for the exhaust heat recovery of the diesel engine (internal combustion engine) as a main machine for ship propulsion is comprised. A magnetic coupling that transmits the rotation of the power turbine to the speed reducer in the recovery power generation apparatus will be described with reference to FIGS. 1 to 6.
As shown in FIG. 1, an exhaust heat recovery type ship propulsion apparatus 1 according to the present embodiment is configured by installing an exhaust heat recovery power generation apparatus 2 for recovering exhaust heat of a diesel engine 3 as a main propulsion apparatus for a ship. is there.
The exhaust heat recovery power generation device 2 has two organic fluid paths of a first cycle 4 and a second cycle 5. The first cycle 4 includes a first circulation pump 11, a first flow rate adjustment valve (not shown), a first evaporator (high pressure evaporator) 12, a power turbine 13, and a condenser 14. Yes. The second cycle 5 includes a second circulation pump 21, a second flow rate adjusting valve (not shown), a second evaporator (low pressure evaporator) 22, a power turbine 13, and a condenser 14. Yes. A power generator 13 is connected to the power turbine 13 via a magnetic coupling 23 and a speed reducer 24.

  The first cycle 4 and the second cycle 5 are common passages in the piping from the power turbine 13 to the condenser 14, and are separate passages in the piping from the condenser 14 to the power turbine 13. The organic fluid (working medium) existing in the first cycle 4 is circulated in the first cycle 4 by the first circulation pump 11, and the organic fluid (working medium) existing in the second cycle 5 is the second circulation pump 21. To circulate in the second cycle 5. The pressure and flow rate of the first cycle 4 are adjusted by the first flow rate adjustment valve, and the pressure and flow rate of the second cycle 5 are adjusted by the second flow rate adjustment valve.

  As the organic fluid flowing through the organic fluid path of the first cycle 4 and the second cycle 5, low molecular hydrocarbons such as isopentane, butane, propane, R134a and R245fa used as refrigerants, and the like can be used. The organic fluid existing in the first cycle 4 sequentially passes through the first circulation pump 11, the first evaporator 12, the power turbine 13, and the condenser 14 and circulates while repeating the phase change. The organic fluid existing in the second cycle 5 sequentially passes through the second circulation pump 21, the second evaporator 22, the power turbine 13, and the condenser 14 and circulates while repeating the phase change.

The first evaporator 12 is heated from the first circulation pump 11 by the heat recovered by the first air cooler 32 and the exhaust gas economizer (exhaust gas heat exchanger) 33 by the heat transfer water flowing through the first exhaust heat recovery flow path 31. It is a heat exchanger that heats the liquid organic fluid sent to change the organic fluid into a gas phase.
The first air cooler 32 cools the compressed air discharged from the turbocharger (supercharger) 34 of the diesel engine 3 by exchanging heat with the heat transfer water. Further, the exhaust gas economizer 33 cools the exhaust gas discharged from the diesel engine 3 by exchanging heat with the heat transfer water.

The second evaporator 22 heats the liquid organic fluid sent from the second circulation pump 21 by the heat recovered by the first air cooler 32 by the heat transfer water flowing through the first exhaust heat recovery flow path 31. And a heat exchanger that changes the organic fluid into a gas phase.
In addition, the 2nd evaporator 22 is good also as heating the organic fluid of the liquid phase sent out from the 2nd circulation pump 21 with the heat of the heat-medium water which heated the organic fluid with the 1st evaporator 12. FIG.

  An organic fluid evaporated by the first evaporator 12 in the first cycle 4 and an organic fluid evaporated by the second evaporator 22 in the second cycle 5 are introduced into the power turbine 13. The power turbine 13 is rotationally driven by a heat drop (enthalpy drop) of the organic fluid evaporated by the first evaporator 12 and a heat drop (enthalpy drop) of the organic fluid evaporated by the second evaporator 22.

  The rotational power of the power turbine 13 is transmitted to the generator 25 through the magnetic coupling 23 and the speed reducer 24, and electric power is obtained by the generator 25. The electric power obtained by the generator 25 is supplied to the inboard system via a power line (not shown). The organic fluid that has passed through the power turbine 13 is cooled by seawater in the condenser 14 to be condensed and liquefied. The condensed and liquefied organic fluid is sent to the first evaporator 12 by the first circulation pump 11 and sent to the second evaporator 22 by the second circulation pump 21.

Next, the first exhaust heat recovery flow path 31 will be described.
The first exhaust heat recovery flow path 31 is a closed circuit, and an exhaust heat recovery pump 41 for circulating the heat transfer water is provided. The exhaust heat recovery pump 41 circulates the heat transfer water so as to exchange heat with the first air cooler 32, the exhaust gas economizer 33, the first evaporator 12, and the second evaporator 22. The heat transfer water cooled by the first evaporator 12 and the second evaporator 22 is collected in the atmospheric pressure drain tank 42 via a pressure reducing valve (not shown). The flow rate of the heat transfer water sent from the exhaust heat recovery pump 41 to the first evaporator 12 and the second evaporator 22 is adjusted by a water supply control valve 43 provided in the first exhaust heat recovery flow path 31.

  The heat medium water inlet temperature of the first evaporator 12 is, for example, about 196 ° C., and the heat medium water outlet temperature is, for example, about 70 ° C. In the first evaporator 12, the organic fluid is evaporated by the heat transfer water.

  A composite boiler 44 is provided on the high temperature side (exhaust gas flow upstream side) of the exhaust gas economizer 33. The composite boiler 44 includes a steam drum 45, a circulation pump 46, and an evaporator 47. The water in the steam drum 45 is sent to the evaporator 47 where it is evaporated by exchanging heat with the exhaust gas.

  The vapor evaporated in the evaporator 47 is guided to the vapor drum 45. The steam staying above the steam drum 45 is guided to an auxiliary device (oil heater, tank heating, etc.), and then collected in the atmospheric pressure drain tank 42. The water level in the steam drum 45 is adjusted by the steam drum level control valve 48, and water is supplied from the atmospheric pressure drain tank 42 to the steam drum 45 by the boiler feed pump 49.

Next, the operation of the exhaust heat recovery power generator 2 will be described.
The air compressed by the turbocharger 34 of the diesel engine 3 is cooled by the first air cooler 32 and the second air cooler 50. At this time, the heat transfer water in the first exhaust heat recovery flow path 31 flowing in the first air cooler 32 is heated by the compressed air, whereby the heat transfer water recovers heat from the compressed air. The heat transfer water temperature after heat recovery by the first air cooler 32 is, for example, about 142 ° C.

  The exhaust gas discharged from the diesel engine 3 is cooled by the evaporator 47 of the composite boiler 44 and the exhaust gas economizer 33. At this time, the heat transfer water in the first exhaust heat recovery flow path 31 flowing through the exhaust gas economizer 33 is heated by the exhaust gas, so that the heat transfer water recovers heat from the exhaust gas. The heat transfer water temperature after heat recovery by the exhaust gas economizer 33 is, for example, about 196 ° C.

  The heat transfer water that has recovered the exhaust heat by the first air cooler 32 and the exhaust gas economizer 33 and has reached a high temperature is guided to the first evaporator 12, while the exhaust heat is recovered by the first air cooler 32. A part of the heat transfer water that has reached a high temperature is guided to the second evaporator 22 and exchanges heat with the organic fluid circulating in the first cycle 4 and the second cycle 5. The organic fluid is heated and evaporated by the sensible heat of the heat transfer water in the first evaporator 12 and the second evaporator 22.

  The organic fluid which has evaporated and becomes high enthalpy is guided to the power turbine 13, and the power turbine 13 is rotationally driven by the heat drop. The generator 25 obtains the rotational output of the power turbine 13 and generates power. The organic fluid (gas phase) that has finished its work in the power turbine 13 is led to the condenser 14 and cooled by cooling water such as seawater to be condensed and liquefied.

  Next, as shown in at least one of FIGS. 2 to 5, in the exhaust heat recovery power generator 2 constituting the exhaust heat recovery ship propulsion device 1 according to the present embodiment, the rotation of the power turbine 13 is reduced by the speed reducer 24. The magnetic coupling 23 that transmits to the inner side includes an inner rotor (inner coupling member) 61, an outer rotor (outer coupling member) 62, and a partition wall (enclosure member) 63.

  The inner rotor 61 includes a magnet (neodymium magnet) 72 serving as an N pole and a magnet (neodymium magnet) 73 serving as an S pole along the circumferential direction at a peripheral portion of a disc-shaped inner yoke 71 having a predetermined thickness. Are fixed to a rotor shaft (first rotating shaft) 13a of the power turbine 13 on the driving side and rotate together with the rotor shaft 13a.

  The outer rotor 62 is coupled to an input shaft (second rotation shaft) 24 a of the reduction gear 24 on the driven side, and has a bottom plate 81 having a circular shape in plan view, and a peripheral wall 82 erected on the peripheral edge of the bottom plate 81. And a magnet (neodymium magnet) 84 serving as an N pole and a magnet (neodymium magnet) 85 serving as an S pole on the inner peripheral surface of the outer yoke 83 (more specifically, the inner peripheral surface of the peripheral wall 82). These are arranged alternately along the circumferential direction, are fixed to the input shaft 24a of the speed reducer 24, and rotate together with the input shaft 24a.

  The partition wall 63 has a cylindrical shape including a bottom plate 91 having a circular shape in a plan view and a peripheral wall 92 erected on the periphery of the bottom plate 91, and is a non-magnetic material (for example, GFRP (Glass Fiber Reinforced Plastics). ) And is disposed between the inner rotor 61 and the outer rotor 62 so as to cover the entire outer side of the inner rotor 61. Also, on the end surface of the peripheral wall 92 located on the side opposite to the bottom plate 91 Is provided such that a flange 93 that expands radially outward is continuous.

  The flange 93 is provided with a plurality of through holes 94 penetrating in the thickness direction along the circumferential direction. The partition wall 63 is fixed to the end surface of the bearing stand 96 that supports the center portion in the axial direction of the rotor shaft 13a via the bolt 95 that is inserted into the through hole 94 and is located on the speed reducer 24 side. A sealed space is formed in the.

The magnetic coupling 23 according to the present embodiment includes an outer holding ring 101, an inner holding ring 102, a spacer (windage prevention member) 103, and a magnet presser 104.
The outer retaining ring 101 has a hollow cylindrical shape and is a member having a thickness of about 15 mm made of a non-magnetic material (for example, CFRP: Carbon Fiber Reinforced Plastics), and extends along the outer peripheral surface of the peripheral wall 82 constituting the outer yoke 83. Thus, it is wound around the entire outer peripheral surface of the peripheral wall 82.

  The inner holding ring 102 has a hollow cylindrical shape and is a member having a thickness of about 2 to 7 mm made of a non-magnetic material (for example, CFRP: Carbon Fiber Reinforced Plastics), and is a magnet arranged on the peripheral edge of the inner yoke 71. 72 and the outer periphery of the magnet 73 are wound around the entire outer periphery of the magnet 72 and the magnet 73.

  The spacer 103 is a member made of a metal material (for example, aluminum) having a cylindrical shape including a bottom plate 111 having a circular shape in a plan view and a peripheral wall 112 erected on the peripheral edge portion of the bottom plate 111. . The spacer 103 is in contact with the lower surface of the bottom plate 111 (the surface located on the right side in FIG. 4) and the upper surface of the bottom plate 81 constituting the outer yoke 83 (the surface located on the right side in FIG. 4). Further, the inner peripheral surface of the peripheral wall 82 constituting the outer yoke 83 is in contact with the front end surface (the end surface located on the left side in FIG. 4) of the peripheral wall 112 and one end surfaces of the magnets 72 and 73 (located on the right side in FIG. 4). A predetermined gap (a gap that absorbs the thermal expansion of the magnets 72 and 73) is formed between the end plate and the bottom plate 81 via a single bolt 113.

At the center in the radial direction of the bottom plate 111, the top surface of the head of the bolt 113 and the top surface of the bottom plate 111 (the surface located on the left side in FIG. 4) form the same plane. A through hole 114 is provided to accommodate the entire portion and a part of the shaft portion.
A central portion in the radial direction of the bottom plate 81 is provided with a female screw portion (not shown) that communicates with the through hole 114 and is screwed with a male screw portion (not shown) formed on the outer peripheral surface of the shaft portion of the bolt 113. Bolt holes 115 are provided.

The outer yoke 83 and the input shaft 24a of the speed reducer 24 include a plurality of holes (8 in this embodiment) inserted through the through holes 121 provided in the bottom plate 81 and the through holes 122 provided in the flange 24c of the input shaft 24a. And a nut 124 having a female screw portion (not shown) that is screwed with a male screw portion (not shown) formed on the outer peripheral surface of the shaft portion of the bolt 123.
The bottom plate 111 communicates with the through hole 121, and is provided with a through hole 125 that accommodates the entire nut 124 such that the top surface of the nut 124 and the top surface of the bottom plate 111 form the same plane. .

  In addition to the through hole 121 and the through hole 122, the bottom plate 81 and the bottom plate 111 include an internal space formed between the bottom plate 91 constituting the partition wall 63 and the bottom plate 111, and an external space existing outside the outer yoke 83. And a plurality of through holes (cooling holes) 126 (see FIG. 6) are provided along the circumferential direction (eight in this embodiment).

The magnet presser 104 includes a peripheral wall 131 and a bottom plate 132.
The peripheral wall 131 has a hollow cylindrical shape and is a member made of a metal material (for example, SUS304). The magnet 84 is arranged along the inner peripheral surface of the magnet 84 and the magnet 85 arranged on the inner peripheral surface of the peripheral wall 82. The magnet 85 is attached so as to cover the entire inner peripheral surface (in contact with the entire inner peripheral surface).

The bottom plate 132 has a ring shape in plan view and is a plate-like member made of a metal material (for example, SUS304), and covers the other end surface (the end surface located on the left side in FIG. 4) of the magnet 84 and the magnet 85 ( The inner peripheral edge located on the radially inner side of the peripheral wall 131 so as to increase in diameter radially outward from one end face of the peripheral wall 131 (the end face located on the left side in FIG. 4). Connected to one end face.
The outer peripheral edge located on the outer side in the radial direction of the bottom plate 132 and the inner peripheral surface of the peripheral wall 82 are joined by spot welding. Bonding may be mechanical bonding such as screwing, bonding with an adhesive, or metallurgical bonding such as pressure welding or fusion welding, but spot welding is particularly desirable.

  As shown in FIG. 5, in this embodiment, the magnet 72 and the magnet 73 are configured such that both side surfaces (side surfaces located on the upper side and the lower side in FIG. 5) of the inner yoke 71 extending in the left-right direction in FIG. 5. They are arranged so as to be parallel to the rotation axis.

According to the magnetic coupling 23 according to the present embodiment, for example, exhaust heat constituting the exhaust heat recovery type ship propulsion device 1 installed for exhaust heat recovery of a diesel engine (internal combustion engine) 3 as a main engine for ship propulsion. In the recovery power generation apparatus, an outer rotor that is applied to the magnetic coupling 23 that transmits the rotation of the power turbine 13 to the speed reducer 24 and constitutes the magnetic coupling 23 when rotating at a high speed of, for example, about 10,000 rotations / unit. Even if a large centrifugal force is applied to 62, the outer rotor 62 is prevented from spreading outward in the radial direction, and the gap between the driving magnets 72 and 73 and the driven magnets 84 and 85 is prevented from spreading. .
Thereby, it is possible to prevent the magnetic force of the driving magnets 72 and 73 against the driven magnets 84 and 85 from being weakened so that the driving force is normally transmitted.

Further, according to the magnetic coupling 23 according to the present embodiment, the through hole that accommodates the entire nut 124 of the bolt 123 and the nut 124 that couple the bottom plate 81 that constitutes the outer yoke 83 and the flange 24c of the input shaft 24a. 125 reduces windage loss caused by the nut 124 rotating together with the outer yoke 83 and the input shaft 24a.
Thereby, the heat generated by the windage can be reduced, and the amount of heat generated in the magnetic coupling 23 can be reduced.

Furthermore, according to the magnetic coupling 23 according to the present embodiment, the internal space is formed via the cooling hole 126 that connects the internal space formed inside the outer yoke 83 and the external space existing outside the outer yoke 83. The high-temperature air existing inside is discharged out of the outer yoke 83.
Thereby, the temperature in internal space can be reduced and the temperature rise of the said magnetic coupling 23 can be suppressed.

  Furthermore, according to the magnetic coupling 23 according to the present embodiment, the bottom plate 132 constituting the magnet presser 104 is disposed so as to be in contact with the other end surfaces of the magnet 84 and the magnet 85 and is located on the radially outer side of the bottom plate 132. Since the outer peripheral edge portion and the inner peripheral surface of the peripheral wall 82 constituting the outer yoke 83 are joined by spot welding, the bolt between the bottom plate 132 constituting the magnet presser 104 and the peripheral wall 82 constituting the outer yoke 83 Bonding can be avoided. Specifically, when the connection between the bottom plate 132 that constitutes the magnet presser 104 and the peripheral wall 82 that constitutes the outer yoke 83 is a bolt connection, stress due to centrifugal force is generated at a notch portion that becomes a bolt hole. . Therefore, stress concentration can be avoided by using spot welding.

Furthermore, according to the magnetic coupling 23 according to the present embodiment, for example, the exhaust heat recovery type ship propulsion device 1 installed for exhaust heat recovery of a diesel engine (internal combustion engine) 3 as a main engine for ship propulsion is configured. In the exhaust heat recovery power generator, the rotation of the power turbine 13 is applied to the magnetic coupling 23 that transmits the rotation of the power turbine 13 to the speed reducer and is rotated at a high speed of about 3000 rpm or more, for example, about 10,000 rpm. Even if a large centrifugal force acts on the inner rotor 61 constituting the magnetic coupling 23 and the driving magnets 72 and 73 attached (attached) to the outer peripheral surface of the inner yoke 71 are peeled off, the driving is performed. Scattering of the magnets 72 and 73 to the outside in the radial direction is prevented.
Thereby, the breakage of the magnetic coupling 23 due to the drive magnets 72 and 73 scattering outward in the radial direction can be prevented.

Furthermore, according to the magnetic coupling 23 according to the present embodiment, these magnets are provided by a predetermined gap provided between the front end surface of the peripheral wall 112 constituting the spacer 103 and one end surfaces of the magnets 84 and 85. The thermal elongation accompanying the temperature rise of 84 and 85 is absorbed.
Thereby, the thermal expansion of the magnets 84 and 85 can be permitted, and the breakage of the magnetic coupling 23 due to the thermal expansion of the magnets 84 and 85 can be prevented.

According to the exhaust heat recovery type ship propulsion apparatus 1 according to the present embodiment, for example, the exhaust heat recovery type ship propulsion apparatus 1 installed for exhaust heat recovery of a diesel engine (internal combustion engine) 3 as a main engine for ship propulsion is used. In the exhaust heat recovery power generator that is configured, the drive magnet 72 is applied to the magnetic coupling 23 that transmits the rotation of the power turbine 13 to the speed reducer 24, for example, even when rotating at a high speed of about 10,000 rpm. 73, a magnetic coupling 23 for preventing the magnetic force of the driven magnets 84 and 85 from being weakened and transmitting the driving force normally is provided.
Thereby, exhaust heat recovery efficiency can be improved and energy saving can be improved.

  According to the ship according to the present embodiment, since the exhaust heat recovery power generation device 2 is provided, the exhaust heat recovery efficiency can be improved, and the energy saving property can be improved.

[Second Embodiment]
A magnetic coupling according to a second embodiment of the present invention will be described with reference to FIGS.
The magnetic coupling according to the present embodiment is different from that of the first embodiment described above in that an inner rotor 140 including an inner retaining ring 142 is provided instead of the inner retaining ring 102.
In addition, the same code | symbol is attached | subjected to the same member as 1st Embodiment mentioned above, and description about these members is abbreviate | omitted here.

The inner holding ring 142 includes a peripheral wall 143 and bottom plates 144 and 145.
The peripheral wall 143 has a hollow cylindrical shape and is a member made of a metal material (for example, SUS304), and the magnet 72 and the magnet 73 are arranged along the outer peripheral surface of the magnet 72 and the magnet 73 arranged on the peripheral edge of the inner yoke 71. The magnet 73 is attached so as to cover the entire outer peripheral surface (in contact with the entire outer peripheral surface).

On the peripheral wall 143, the top surface of the head of a screw 146 (see FIG. 7) arranged along the circumferential direction between the magnet 72 and the magnet 73 does not protrude outward from the outer peripheral surface of the peripheral wall 143. A through hole 147 for receiving the head of the screw 146 is provided.
The peripheral edge of the inner yoke 71 accommodates the head of a screw 146 that communicates with the through hole 147 and cannot be accommodated in the through hole 147 (projects radially inward from the through hole 147). A screw hole 148 provided with a female screw part (not shown) that is screwed with a male screw part (not shown) formed on the outer peripheral surface of the part is provided.

  The bottom plate 144 is a plate-like member that has an annular shape in plan view and is made of a metal material (for example, SUS304), and covers one end face (the end face located on the left side in FIG. 8) of the magnet 72 and the magnet 73 ( The outer peripheral edge located on the radially outer side of the peripheral wall 143 so that the diameter of the peripheral wall 143 decreases radially inward from one end face (the end face located on the left side in FIG. 8) of the peripheral wall 143. Connected to one end face.

  The bottom plate 145 is a plate-like member that has an annular shape in plan view and is made of a metal material (for example, SUS304), and covers the other end surfaces (the end surface located on the right side in FIG. 8) of the magnet 72 and the magnet 73 ( The outer peripheral edge located on the radially outer side of the peripheral wall 143 so that the diameter of the peripheral wall 143 decreases radially inward from the other end face (the end face located on the right side in FIG. 8) of the peripheral wall 143. Connected to the other end surface.

According to the magnetic coupling according to the present embodiment, the inner holding ring 142 is made of a metal material (for example, SUS304) having better thermal conductivity (heat dissipation) than the fiber reinforced plastic (resin material).
Thereby, the temperature rise of the inner yoke 71 and the magnets 72 and 73 can be suppressed.

Further, according to the magnetic coupling according to the present embodiment, even if the inner holding ring 142 is manufactured to have an inner diameter (slightly) larger than the outer diameter of the inner yoke 71, the inner holding ring 142 and the inner yoke 71 is rotated together by a screw 146.
Thereby, the fitting of the inner holding ring 142 and the inner yoke 71 can be loosened somewhat (a little), and the manufacturability of the magnetic coupling can be improved.

Furthermore, according to the magnetic coupling according to the present embodiment, the windage loss due to the screw 146 is reduced by the screw hole 148 that accommodates the entire head of the screw 146.
Thereby, the heat generated by windage can be reduced, and the amount of heat generated in the magnetic coupling can be reduced.
Other functions and effects are the same as those of the above-described first embodiment, and thus description thereof is omitted here.

[Third Embodiment]
A magnetic coupling according to a third embodiment of the present invention will be described with reference to FIG.
In the magnetic coupling according to the present embodiment, both side surfaces of the magnet 72 and the magnet 73 (the side surfaces positioned on the upper side and the lower side in FIG. 10) are relative to the rotation axis C of the inner yoke 71 extending in the left-right direction in FIG. This is different from that of the first embodiment described above in that the inner rotor 149 is disposed so as to be inclined by an angle θ (for example, less than 5 degrees).
In addition, the same code | symbol is attached | subjected to the same member as 1st Embodiment mentioned above, and description about these members is abbreviate | omitted here.

According to the magnetic coupling according to this embodiment, when the inner rotor 149 rotates, the air flow indicated by the solid arrows in FIG. 10 is caused to flow in the inner yoke 71, the magnet 72, the magnet 73, and the inner holding ring 102. The inner yoke 71 and the magnets 72 and 73 are cooled by the flow of air generated in the enclosed space and indicated by solid arrows in FIG.
Thereby, the temperature rise of the inner yoke 71 and the magnets 72 and 73 can be further suppressed.
Other functions and effects are the same as those of the above-described first embodiment, and thus description thereof is omitted here.
Note that this embodiment can also be applied to the above-described second embodiment.

[Fourth Embodiment]
A magnetic coupling according to a fourth embodiment of the present invention will be described with reference to FIGS.
In the magnetic coupling according to the present embodiment, the inner peripheral surface and the outer peripheral surface of the magnet 72 and the magnet 73 are at an angle θ1 (for example, about 1 degree) with respect to the rotation axis C of the inner yoke 71 extending in the left-right direction in FIG. In other words, the outer peripheral surface and the inner peripheral surface of one end surface of the magnet 72 and the magnet 73 are positioned radially outward from the outer peripheral surface and the inner peripheral surface of the other end surface of the magnet 72 and the magnet 73. The second embodiment is different from the second embodiment described above in that the magnet 72 and the magnet 73 are disposed and the inner rotor 150 including the inner holding ring 151 is provided instead of the inner holding ring 142.
In addition, the same code | symbol is attached | subjected to the same member as 2nd Embodiment mentioned above, and description about these members is abbreviate | omitted here.

The inner holding ring 151 includes a peripheral wall 153 and bottom plates 154 and 155.
The peripheral wall 153 has a hollow cylindrical shape and is a member made of a metal material (for example, SUS304), and the magnet 72 and the magnet 72 arranged on the peripheral edge of the inner yoke 71 along the outer peripheral surface of the magnet 72 and the magnet 72 The magnet 73 is attached so as to cover the entire outer peripheral surface (in contact with the entire outer peripheral surface).
The inner peripheral surface of the peripheral wall 153 is inclined by an angle θ1 (for example, about 1 degree) with respect to the rotation axis C of the inner yoke 71, that is, the inner peripheral surface at one end surface of the peripheral wall 153 is the other of the peripheral wall 153. The end surface is formed in a tapered shape so as to be located on the outer side in the radial direction from the inner peripheral surface.

  The bottom plate 154 has a ring shape in plan view and is a plate-like member made of a metal material (for example, SUS304), and a part of one end surface (the end surface located on the left side in FIG. 12) of the magnet 72 and the magnet 73. (For example, outside the center in the radial direction) (in contact with one end surface), and so that the diameter decreases from one end surface of the peripheral wall 153 (the end surface located on the left side in FIG. 12) radially inward. An outer peripheral edge located on the radially inner side is connected to one end face of the peripheral wall 153.

  The bottom plate 155 is a plate-like member that has an annular shape in plan view and is made of a metal material (for example, SUS304), and is a part of the other end surface (the end surface located on the right side in FIG. 12) of the magnet 72 and the magnet 73. (For example, the outer side of the center in the radial direction) is covered (in contact with the other end surface), and the diameter is reduced radially inward from the other end surface of the peripheral wall 153 (the end surface located on the right side in FIG. 12). An outer peripheral edge located on the outer side in the radial direction is connected to the other end surface of the peripheral wall 153.

According to the magnetic coupling according to the present embodiment, the peripheral wall 153 can be simply moved in the axial direction along the magnet 72 and the magnet 73 arranged on the peripheral edge of the inner yoke 71 by moving the peripheral wall 153 of the inner holding ring 151 in the axial direction. The inner peripheral surface of the magnet is in close contact with the entire outer peripheral surface of the magnet 72 and the magnet 73.
Thereby, the fitting of the inner holding ring 151 and the inner yoke 71 can be made somewhat (slightly) loose, and the manufacturability of the magnetic coupling can be improved.

In addition, according to the magnetic coupling according to the present embodiment, the screw 146, the through hole 147, and the screw hole 148 described in the second embodiment can be omitted, and the configuration can be simplified. Thus, the manufacturing cost can be reduced.
Note that the bottom plates 154 and 155 are not essential components, and only the peripheral wall 153 may be an inner holding ring.

[Fifth Embodiment]
A magnetic coupling according to a fifth embodiment of the present invention will be described with reference to FIGS. 13 and 14.
The magnetic coupling according to this embodiment is different from that of the first embodiment described above in that an inner rotor 160 including an inner holding ring 161 is provided instead of the inner holding ring 102.
In addition, the same code | symbol is attached | subjected to the same member as 1st Embodiment mentioned above, and description about these members is abbreviate | omitted here.

The inner holding ring 161 includes a peripheral wall 163 and bottom plates 164 and 165.
The peripheral wall 163 has a hollow cylindrical shape and is a member having a thickness of about 2 to 7 mm made of a non-magnetic material (for example, CFRP: Carbon Fiber Reinforced Plastics). The magnet 72 arranged on the peripheral edge of the inner yoke 71 and Along the outer peripheral surface of the magnet 73, the magnet 72 and the entire outer peripheral surface of the magnet 73 are wound.

  The bottom plate 164 has a ring shape in plan view and is a plate-like member made of a metal material (for example, aluminum), and covers one end surface (the end surface located on the left side in FIG. 14) of the magnet 72 and the magnet 73 ( The outer peripheral edge portion located on the outer side in the radial direction so that the diameter of the peripheral wall 163 decreases radially inward from one end surface (the end surface located on the left side in FIG. 14) of the peripheral wall 163. Connected to one end face.

  The bottom plate 165 is a plate-like member that has an annular shape in plan view and is made of a metal material (for example, aluminum), and covers the other end surface (the end surface located on the right side in FIG. 14) of the magnet 72 and the magnet 73 ( The outer peripheral edge located on the radially outer side of the peripheral wall 163 so that the diameter of the peripheral wall 163 decreases radially inward from the other end face (the end face located on the right side in FIG. 14) of the peripheral wall 163. Connected to the other end surface.

The bottom plate 164 and the bottom plate 165 are arranged so as to be parallel to the rotation axis of the inner yoke 71 that extends in the left-right direction in FIG. 14, and both sides of the magnet 72 and the magnet 73 (on the upper side and the lower side in FIG. 14). They are connected via a connecting plate 166 arranged so as to cover (contact) the side surfaces.
The bottom plates 164 and 165 have a substantially isosceles trapezoidal through-hole 167 in plan view that penetrates in the plate thickness direction and communicates with the space formed by the magnet 72, the magnet 73, the peripheral wall 163, and the inner yoke 71. A plurality (12 in this embodiment) are provided along the direction.

According to the magnetic coupling according to the present embodiment, the movement of the magnets 72 and 73 in the circumferential direction is restricted by the connecting plates 166 arranged so as to be in contact with both side surfaces of the magnets 72 and 73.
Thereby, peeling of the magnets 72 and 73 attached (attached) to the outer peripheral surface of the inner yoke 71 can be prevented, and scattering of the magnets 72 and 73 outward in the radial direction can be prevented. Further, it is possible to prevent the magnetic coupling from being damaged due to the magnets 72 and 73 being scattered radially outward.

Moreover, according to the magnetic coupling according to the present embodiment, outside air flows into the space surrounded by the inner yoke 71, the magnet 72, the magnet 73, and the peripheral wall 163 through the through hole 167, and the through hole Air inside the space surrounded by the inner yoke 71, the magnet 72, the magnet 73, and the peripheral wall 163 flows out through the 167, and the space surrounded by the inner yoke 71, the magnet 72, the magnet 73, and the peripheral wall 163. The inside air is changed as needed, and the inner yoke 71 and the magnets 72 and 73 are cooled.
Thereby, the temperature rise of the inner yoke 71 and the magnets 72 and 73 can be further suppressed.
Other functions and effects are the same as those of the above-described first embodiment, and thus description thereof is omitted here.

[Sixth Embodiment]
A magnetic coupling according to a sixth embodiment of the present invention will be described with reference to FIGS.
The magnetic coupling according to this embodiment is different from that of the first embodiment described above in that an inner rotor 170 including an inner holding ring 171 is provided instead of the inner holding ring 102.
In addition, the same code | symbol is attached | subjected to the same member as 1st Embodiment mentioned above, and description about these members is abbreviate | omitted here.

The inner holding ring 171 includes a peripheral wall 173 and bottom plates 174 and 175.
The peripheral wall 173 has a hollow cylindrical shape and is a member having a thickness of about 2 to 7 mm made of a non-magnetic material (for example, CFRP: Carbon Fiber Reinforced Plastics). The magnet 72 arranged on the peripheral edge of the inner yoke 71 and Along the outer peripheral surface of the magnet 73, the magnet 72 and the entire outer peripheral surface of the magnet 73 are wound.

  The bottom plate 174 has a ring shape in plan view, and is a plate-like member made of a metal material (for example, aluminum), and covers one end surface (the end surface located on the left side in FIG. 16) of the magnet 72 and the magnet 73 ( The outer peripheral edge portion located on the radially outer side of the peripheral wall 173 so that the diameter of the peripheral wall 173 decreases radially inward from one end surface of the peripheral wall 173 (the end surface located on the left side in FIG. 16). Connected to one end face.

  The bottom plate 175 is a plate-like member that has an annular shape in plan view and is made of a metal material (for example, aluminum), and covers the other end surface (the end surface located on the right side in FIG. 16) of the magnet 72 and the magnet 73 ( The outer peripheral edge located on the outer side in the radial direction so that the diameter of the peripheral wall 173 decreases radially inward from the other end face of the peripheral wall 173 (the end face located on the right side in FIG. 16). Connected to the other end surface.

The bottom plate 174 and the bottom plate 175 are arranged so as to be parallel to the rotation axis of the inner yoke 71 extending in the left-right direction in FIG. 16, and both sides of the magnet 72 and the magnet 73 (on the upper side and the lower side in FIG. 16). Each side surface is covered (contacted), and is connected via a connecting rod 176 disposed so as to fill a gap between the magnet 72 and the magnet 73.
The bottom plates 174 and 175 and the connecting rod 176 are joined by laser welding. Reference numerals 177 in FIGS. 15 and 17 indicate welds.

According to the magnetic coupling according to the present embodiment, the movement of the magnets 72 and 73 in the circumferential direction is the same as that of the fifth embodiment described above by the connecting rods 176 arranged so as to contact both side surfaces of the magnets 72 and 73. You will be bound more than things.
Thereby, peeling of the magnets 72 and 73 attached (attached) to the outer peripheral surface of the inner yoke 71 can be prevented, and scattering of the magnets 72 and 73 outward in the radial direction can be prevented. Further, it is possible to prevent the magnetic coupling from being damaged due to the magnets 72 and 73 being scattered radially outward.
Other functions and effects are the same as those of the above-described first embodiment, and thus description thereof is omitted here.

[Seventh Embodiment]
A magnetic coupling according to a seventh embodiment of the present invention will be described with reference to FIGS.
The magnetic coupling according to the present embodiment differs from that of the first embodiment described above in that an inner rotor 180 including an inner retaining ring 181 is provided instead of the inner retaining ring 102.
In addition, the same code | symbol is attached | subjected to the same member as 1st Embodiment mentioned above, and description about these members is abbreviate | omitted here.

The inner holding ring 181 includes a (first) peripheral wall 182, a (second) peripheral wall 183, and bottom plates 184 and 185.
The peripheral wall 182 has a hollow cylindrical shape and is a member having a thickness of about 2 to 7 mm made of a metal material (for example, SUS304), and the entire outer peripheral surfaces of the magnets 72 and 73 arranged on the peripheral edge of the inner yoke 71. It is attached by shrink fitting so as to cover (contact with the entire outer peripheral surface).

The peripheral wall 183 has a hollow cylindrical shape and is a member having a thickness of about 2 to 7 mm made of a non-magnetic material (for example, CFRP: Carbon Fiber Reinforced Plastics), and the outer periphery of the peripheral wall 182 extends along the outer peripheral surface of the peripheral wall 182. It is wrapped around the entire surface.
The peripheral wall 183 is attached by a cold fit.

  The bottom plate 184 has a ring shape in plan view and is a plate-like member made of a metal material (for example, aluminum), and covers one end surface (the end surface located on the left side in FIG. 19) of the magnet 72 and the magnet 73 ( The diameter of the peripheral wall 182 is reduced radially inward from one end face (the end face located on the left side in FIG. 19) of the peripheral wall 182, and the diameter is increased radially outward from the one end face of the peripheral wall 182. As described above, the outer peripheral portion located on the outer side in the radial direction is connected to one end surface of the peripheral wall 182.

  The bottom plate 185 is a plate-like member that has an annular shape in plan view and is made of a metal material (for example, aluminum), and covers the other end surfaces (the end surface located on the right side in FIG. 19) of the magnet 72 and the magnet 73 ( The other end surface of the peripheral wall 182 (the end surface located on the right side in FIG. 19), and the diameter of the peripheral wall 182 decreases from the other end surface to the radially outer side. Thus, the outer peripheral part located in the radial direction outer side is connected to the other end surface of the peripheral wall 182.

The bottom plate 184 and the bottom plate 185 are disposed so as to be parallel to the rotation axis of the inner yoke 71 extending in the left-right direction in FIG. 19, and are disposed on both sides of the magnet 72 and the magnet 73 (on the upper side and the lower side in FIG. 19). Each side surface is covered (contacted), and is connected via a connecting rod 186 arranged so as to fill a gap between the magnet 72 and the magnet 73.
The bottom plates 184 and 185 and the connecting rod 186 are joined by laser welding. Reference numeral 187 in FIGS. 18 and 19 indicates a welded portion.

According to the magnetic coupling according to the present embodiment, even if the peripheral wall 182 is damaged by the magnets 72 and 73, the peripheral wall 183 located on the radially outer side of the peripheral wall 182 maintains a healthy state.
As a result, even if the peripheral wall 182 is damaged by the magnets 72 and 73, the magnets 72 and 73 can be prevented from scattering radially outward, and the magnets 72 and 73 are scattered radially outward. It is possible to prevent the magnetic coupling from being damaged.

Moreover, according to the magnetic coupling which concerns on this embodiment, the movement to the circumferential direction of the magnets 72 and 73 is the 5th execution mentioned above by the connecting rod 186 arrange | positioned so that both the side surfaces of the magnets 72 and 73 may be contact | connected. It will be restrained rather than the form.
Thereby, peeling of the magnets 72 and 73 attached (attached) to the outer peripheral surface of the inner yoke 71 can be prevented, and scattering of the magnets 72 and 73 outward in the radial direction can be prevented. Further, it is possible to prevent the magnetic coupling from being damaged due to the magnets 72 and 73 being scattered radially outward.
Other functions and effects are the same as those of the above-described first embodiment, and thus description thereof is omitted here.

  In addition, this invention is not limited to embodiment mentioned above, It can also implement by changing and changing suitably as needed.

1 Waste heat recovery type ship propulsion device 3 Diesel engine (internal combustion engine)
4 First cycle (circulation route)
5 Second cycle (circulation route)
12 (First) Evaporator 13 Power turbine (turbine)
13a (first) rotating shaft 14 condenser 22 (second) evaporator 23 magnetic coupling 24 speed reducer 24a input shaft (second rotating shaft)
25 generator 61 inner rotor 62 outer rotor 71 inner yoke 72 magnet 73 magnet 81 bottom plate 82 circumferential wall 83 outer yoke 84 magnet 85 magnet 101 outer retaining ring 102 inner retaining ring 103 spacer 111 bottom plate 112 circumferential wall 123 bolt 124 nut 125 through hole 126 cooling Hole 132 Magnet holder

Claims (9)

Magnets serving as N poles and magnets serving as S poles are alternately arranged along the circumferential direction at the periphery of the disc-shaped inner yoke, and are fixed to the first rotating shaft on the drive side. An inner rotor that rotates with the first rotating shaft;
A magnet that becomes an N pole and a magnet that becomes an S pole are formed on the inner peripheral surface of the outer wall of the outer yoke including a bottom portion having a circular shape in plan view and a peripheral wall portion having a ring shape in plan view. An outer rotor that is alternately arranged along a direction and is fixed to a second rotating shaft that is driven with respect to the first rotating shaft and rotates together with the second rotating shaft. Coupling,
A magnetic coupling, wherein an outer retaining ring having a ring shape in plan view and made of fiber reinforced plastic is attached to an outer peripheral surface of the peripheral wall portion of the outer yoke. A spacer including a bottom portion having a circular shape in plan view and a peripheral wall portion having a ring shape in plan view is in contact with a lower surface of the bottom portion of the spacer and an upper surface of the bottom portion of the outer yoke, and the spacer The outer peripheral surface of the peripheral wall portion and the inner peripheral surface of the peripheral wall portion of the outer yoke are provided in contact with each other,
The bottom portion of the spacer is provided with a through hole that accommodates the entire nut of a bolt and a nut that couples the bottom portion of the outer yoke and the second rotating shaft. Item 2. The magnetic coupling according to Item 1.   The bottom portion of the spacer and the bottom portion of the outer yoke are provided with cooling holes that connect the internal space formed inside the outer yoke and the external space existing outside the outer yoke. The magnetic coupling according to claim 1, wherein: A magnet presser having a ring shape in plan view is disposed so as to be in contact with the N pole magnets arranged on the inner peripheral surface of the peripheral wall portion of the outer yoke and the end surfaces of the S pole magnets,
The outer peripheral edge part located in the radial direction outer side of the said magnet press and the inner peripheral surface of the said surrounding wall part of the said outer yoke are couple | bonded, The Claim 1 characterized by the above-mentioned. Magnetic coupling.   An inner retaining ring having a hollow cylindrical shape and made of fiber reinforced plastic is attached to the outer peripheral surfaces of the N pole magnet and the S pole magnet arranged at the peripheral edge of the inner yoke. The magnetic coupling according to claim 1, wherein the magnetic coupling is a magnetic coupling.   The predetermined gap is provided between the front end surface of the said surrounding wall part of the said spacer, the magnet used as the said N pole, and the end surface of the magnet used as the said S pole, The Claim 2 to 5 characterized by the above-mentioned. The magnetic coupling as described in any one. A ship's internal combustion engine;
A plurality of evaporators installed in parallel in the circulation path of the working medium, and evaporating the working medium by heat medium having different temperatures,
A turbine driven by the working medium evaporated by the evaporator;
A generator for generating electricity by the rotational output of the turbine;
A condenser for condensing the working medium that has passed through the turbine;
A magnetic coupling that transmits the rotation of the turbine to a reducer disposed between the turbine and the generator;
The exhaust heat recovery apparatus, wherein the magnetic coupling is a magnetic coupling according to any one of claims 1 to 6.   An exhaust heat recovery type ship propulsion apparatus comprising the exhaust heat recovery apparatus according to claim 7.   A ship comprising the exhaust heat recovery type ship propulsion device according to claim 8.

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