WO2020208888A1 - Magnetic fluid drive device and heat transport system - Google Patents

Magnetic fluid drive device and heat transport system Download PDF

Info

Publication number
WO2020208888A1
WO2020208888A1 PCT/JP2020/001747 JP2020001747W WO2020208888A1 WO 2020208888 A1 WO2020208888 A1 WO 2020208888A1 JP 2020001747 W JP2020001747 W JP 2020001747W WO 2020208888 A1 WO2020208888 A1 WO 2020208888A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic fluid
heat
magnetic
driving device
heat receiver
Prior art date
Application number
PCT/JP2020/001747
Other languages
French (fr)
Japanese (ja)
Inventor
努 吉川
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2020208888A1 publication Critical patent/WO2020208888A1/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B21/00—Machines, plants or systems, using electric or magnetic effects
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K44/00—Machines in which the dynamo-electric interaction between a plasma or flow of conductive liquid or of fluid-borne conductive or magnetic particles and a coil system or magnetic field converts energy of mass flow into electrical energy or vice versa
    • H02K44/02—Electrodynamic pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

Definitions

  • the present disclosure relates to a ferrofluid drive and a heat transport system including a ferrofluid drive.
  • Patent Document 1 discloses a magnetic fluid driving device used in a system in which a heated magnetic fluid is moved and its thermal energy or kinetic energy is utilized.
  • the magnetic fluid driving device of Patent Document 1 includes a circulation flow path in which the magnetic fluid is sealed, and a heating unit and a magnetic field application unit in the circulation flow path.
  • the device is downsized by reducing the inner diameter of the cross section of the circulation flow path.
  • a heat transport device using a heat pipe or the like provided with a magnetic field application part and a heat generating part is disclosed.
  • Patent Document 2 discloses a magnetic fluid driving device as a means for efficiently driving a magnetic fluid and transporting heat by using a heat medium flowing in a tube as a heat source.
  • the magnetic fluid driving device of Patent Document 2 includes a double tube having an inner tube and an outer tube formed outside the inner tube, and a magnetic field application portion arranged outside the double tube.
  • a magnetic fluid is driven by circulating a heat medium in an inner tube.
  • the present disclosure provides a magnetic fluid driving device and a heat transport system capable of efficiently driving a magnetic fluid in response to heat reception from a heat source.
  • the magnetic fluid driving device is a device that drives a magnetic fluid having temperature sensitivity in response to heat reception.
  • the ferrofluid drive device includes a heat receiver and a magnetic member.
  • the heat receiver has a flow path through which the magnetic fluid flows and receives heat.
  • the magnetic member includes at least one magnet and creates a magnetic field between the pair of facing surfaces.
  • the heat receiver has a size larger in the width direction intersecting the flow direction in which the magnetic fluid flows in the flow path than in the vertical direction intersecting the flow direction and the width direction.
  • the magnetic members are arranged so that a pair of facing surfaces are located on both sides of the heat receiver in the width direction and face each other via the heat receiver.
  • the heat transport system includes a heat source and the above-mentioned magnetic fluid drive device.
  • the heat source is arranged adjacent to a surface formed by the width direction and the flow direction of the outer circumference of the heat receiver.
  • the ferrofluid drive device drives a ferrofluid in response to heat from a heat source.
  • the magnetic fluid driving device and the heat transport system according to the present disclosure, it is possible to efficiently drive the magnetic fluid according to the heat received from the heat source.
  • FIG. 1 The figure which illustrates the structure of the heat transport system which concerns on Embodiment 1 of this disclosure.
  • Front view of the magnetic fluid drive device of FIG. Side view of the magnetic fluid drive device of FIG.
  • the figure explaining the operating principle of the magnetic fluid drive device in a heat transport system The figure which illustrates the magnetic fluid drive device in the application example of a heat receiver
  • FIG. 1 Front view of the magnetic fluid drive device of FIG. The figure which shows the simulation result in the magnetic fluid drive device
  • Front view of the magnetic fluid drive device of FIG. Perspective view showing a configuration example of the magnetic fluid drive device according to the third embodiment.
  • the figure which illustrates the magnetic member of the magnetic fluid drive device in Embodiment 3. A perspective view showing a modified example of the magnetic fluid driving device according to the third embodiment.
  • FIG. 1 illustrates the configuration of the heat transport system 1 according to the present embodiment.
  • the heat transport system 1 includes a magnetic fluid driving device 10 and a heat source 11.
  • the heat transport system 1 of the present embodiment is incorporated in, for example, various electronic devices, and transports heat so that the magnetic fluid drive device 10 constitutes a cooling mechanism for cooling a heat source 11 accompanied by heat generation in the components of the device. Do.
  • the magnetic fluid drive device 10 of the present embodiment includes a heat receiver 21, magnets 31 and 32, a radiator 12, and flow path tubes 41 and 42.
  • a magnetic fluid having a temperature dependence of magnetization, that is, temperature sensitivity, is sealed in the heat receiver 21 and the flow path tubes 41 and 42.
  • the magnetic fluid driving device 10 of the present embodiment is a device that self-circulates the magnetic fluid in response to heat reception from the outside such as a heat source 11 by utilizing the temperature change of the magnetic body force acting on the magnetic fluid. ..
  • the heat source 11 a surface heat source that generates heat in a planar manner is assumed.
  • the heat source 11 is, for example, a light source element such as a semiconductor laser or an LED array, a spatial light modulation element such as a DMD, a phosphor element, an optical system, or the like when the electronic device is a projector. Further, not only a projector but also a semiconductor element such as a CPU or an LSI in various devices, a secondary battery, and the like are examples of a planar heat source 11.
  • a conventional cooling mechanism using a magnetic fluid receives heat from a heat source with a circular pipe (for example, Patent Documents 1 and 2). According to the diligent research of the inventor of the present application, it has become clear that in such a conventional technique, it is difficult to efficiently receive heat from the heat source 11 when the heat source 11 is planar.
  • the inventor of the present application has made extensive studies and has come up with a heat transport system 1 that can efficiently receive heat from a planar heat source 11 by using a flat shape for the heat receiver 21.
  • the heat receiver 21 is a tubular member that forms a flow path through which the magnetic fluid flows, and includes, for example, a connection portion with the flow path tubes 41 and 42.
  • the heat receiver 21 is a portion in the flow path of the magnetic fluid driving device 10 where the magnetic fluid receives heat from the heat source 11.
  • the flow path pipes 41 and 42 are portions corresponding to the flow path for circulating the magnetic fluid between the heat receiver 21 and the radiator 12.
  • the magnetic fluid driving device 10 of the present embodiment uses two magnets 31 and 32 as an example of a magnetic member that generates a magnetic field for driving the magnetic fluid.
  • the magnets 31 and 32 are permanent magnets such as neodymium magnets, ferrite magnets, and samarium-cobalt magnets. Details of the structure of the magnetic fluid driving device 10 such as the magnetic member and the heat receiver 21 will be described later.
  • the magnetic fluid contains ferromagnetic particles and a mother liquor in which the ferromagnetic particles are dispersed.
  • the ferromagnetic particles may be, for example, iron oxide-based fine particles, spinel ferrite, or the like.
  • As the mother liquor of the magnetic fluid water or a hydrocarbon system such as kerosine can be used.
  • the magnetic fluid may be colloidal or may be constructed using microcapsule technology (see Non-Patent Document 1).
  • the temperature sensitivity of the magnetic fluid is appropriately set in consideration of the temperature assumed by the heat generated by the heat source 11 and the Curie temperature.
  • the radiator 12 dissipates the hot magnetic fluid flowing from the heat receiver 21 through the flow path tube 42.
  • the radiator 12 is connected to the flow path pipe 41 so as to circulate the radiated magnetic fluid to the heat receiver 21 again.
  • the radiator 12 can be configured with various heat sinks.
  • the radiator 12 may be a radiator using a Peltier element.
  • the magnetic fluid drive device 10 may be provided separately from the radiator 12.
  • FIG. 2 is a perspective view showing a configuration example of the magnetic fluid drive device 10 in the heat transport system 1 of the present embodiment.
  • FIG. 2 illustrates a state in which the flow path 20 is opened in the heat receiver 21 (the same applies hereinafter).
  • the heat receiver 21 has a rectangular cross-sectional shape in which the flow path 20 has a long side and a short side.
  • the flow direction in which the magnetic fluid flows in the flow path 20 of the heat receiver 21 is defined as the Z direction
  • the long side direction orthogonal to the Z direction and parallel to the long side is defined as the X direction
  • the directions are orthogonal to the Z and X directions.
  • the short side direction parallel to the short side is defined as the Y direction.
  • the heat receiver 21 has two main surfaces on the ⁇ Y side along the long side and two main surfaces on the ⁇ X side along the short side.
  • the size of each main surface on the ⁇ Y side, that is, the side surface on the long side is larger than the size of each main surface on the ⁇ X side, that is, the side surface on the short side.
  • the X and Y directions are examples of the width direction and the vertical direction in the magnetic fluid driving device 10 of the present embodiment, respectively.
  • the heat source 11 in the heat transport system 1 has, for example, a heat generating surface 11a that generates heat in a planar shape.
  • the heat generating surface 11a may have various undulations depending on the shape, structure, arrangement, and the like of various parts serving as the heat source 11.
  • the heat source 11 is arranged adjacent to the ⁇ Y side of the heat receiver 21, for example, with the heat generating surface 11a facing the + Y side.
  • the heat generating surface 11a is arranged along the side surface on the long side of the heat receiving device 21, for example, parallel to the X and Z directions.
  • FIG. 3 shows a front view of the magnetic fluid driving device 10 of FIG. 2 as viewed from the ⁇ Z side.
  • the two magnets 31 and 32 of the magnetic fluid drive device 10 in the present embodiment are adjacent to both ends (that is, ⁇ X side) on the short side of the heat receiver 21 so as to face each other via the heat receiver 21 in the X direction. Is placed.
  • the two magnets 31, 32 have, for example, the same dimensions.
  • Each of the magnets 31 and 32 is formed in a flat plate shape, for example, and each has two main surfaces. The main surfaces of the magnets 31 and 32 are arranged along the side surface on the short side side of the heat receiver 21, for example, parallel to the Y and Z directions.
  • FIG. 3 illustrates the polarities of the magnetic poles of the magnets 31 and 32 in the ferrofluid drive device 10.
  • each main surface of the magnets 31 and 32 constitutes an north pole or an south pole.
  • the main surface 31a of one magnet 31 adjacent to the heat receiver 21 and the main surface 32a of the other magnet 32 adjacent to the heat receiver 21 have opposite polarities.
  • the facing main surfaces 31a and 32a of the two magnets 31 and 32 are an example of a pair of facing surfaces in the present embodiment.
  • FIG. 4 shows a side view of FIG. 2 as viewed from the ⁇ X side.
  • the magnets 31 and 32 and the heat source 11 are arranged so as to be displaced from each other in the Z direction in which the magnetic fluid flows.
  • the range in which the heat generating surface 11a of the heat source 11 is arranged is arranged so as to overlap approximately half of the + Z side of the range in which the magnets 31 and 32 are arranged.
  • the range of the heat generating surface 11a may extend to the + Z side from the range of the magnets 31 and 32.
  • the range of such arrangement is appropriately set according to various conditions from the viewpoint of strengthening the driving force of the magnetic fluid.
  • the arrangement of the heat source 11 and the magnets 31 and 32 can be easily finely adjusted without being aware of mutual interference.
  • FIG. 5 is a diagram illustrating the operating principle of the magnetic fluid driving device 10 in the heat transport system 1.
  • FIG. 5 corresponds to a plan view of FIG. 2 as viewed from the + Y side.
  • the magnetic fields H from the two magnets 31 and 32 are applied to the magnetic fluid 40 in the heat receiver 21.
  • a magnetic body force proportional to the gradient of the magnetic field H and the magnetization of the magnetic fluid 40 acts on the magnetic fluid 40 (see Patent Documents 1 and 2).
  • FIG. 5 the magnetic body force F1 on the ⁇ Z side and the magnetic body force F2 on the + Z side are illustrated.
  • the heat source 11 does not generate heat and the temperature of the magnetic fluid 40 does not change between the + Z side and the ⁇ Z side
  • the respective magnetic body forces F1 and F2 are balanced, and the magnetic fluid 40 does not move in particular. ..
  • the magnetic fluid 40 receives heat from the heat source 11 on the + Z side of the heat receiver 21.
  • the temperature of the magnetic fluid 40 on the + Z side rises higher than that on the ⁇ Z side.
  • the magnetization of the magnetic fluid 40 becomes weaker as the temperature rises. Therefore, the magnetic body force F2 on the + Z side becomes weak, and the magnetic body forces F1 and F2 on the ⁇ Z side become unbalanced. Then, the magnetic body force F1 on the ⁇ Z side becomes dominant as a whole of the force acting on the magnetic fluid 40, and the magnetic fluid 40 is driven so as to flow from the ⁇ Z side to the + Z side.
  • the magnetic fluid 40 that has received heat on the + Z side of the heat receiver 21 and has reached a high temperature flows out from the + Z side of the heat receiver 21 and further advances through the flow path tube 42 to reach the radiator 12 (see FIG. 1). ..
  • the radiator 12 dissipates heat from the magnetic fluid 40.
  • the magnetic fluid 40 that has passed through the radiator 12 can flow into the heat receiver 21 again from the ⁇ Z side in a state where the temperature is lower than that when the heat receiver 21 flows out.
  • Such circulation is continued as long as the heat receiver 21 has a temperature gradient due to the heat generated by the heat source 11. For example, when the heat generated by the heat source 11 is constant, the thermal equilibrium state is reached, and the flow rate of the magnetic fluid 40 is maintained constant. When the heat generation of the heat source 11 is stopped, the flow rate of the magnetic fluid 40 gradually decreases, and then the magnetic fluid 40 is stopped.
  • the heat transport system 1 of the present embodiment can self-circulate drive the magnetic fluid 40 in the magnetic fluid drive device 10 to transport heat and cool the heat source 11.
  • FIG. 6 is a diagram illustrating magnetic fluid driving devices 10x and 10y in an application example of the flat heat receiver 21x.
  • FIG. 6A shows a perspective view of the magnetic fluid driving device 10x according to the first application example of the heat receiver 21x.
  • FIG. 6B shows a perspective view of the magnetic fluid driving device 10y according to the second application example.
  • a magnet 31x is placed on the opposite side (for example, + Y side) of the heat source 11 on the long side.
  • a configuration of the magnetic fluid drive device 10x to be arranged can be considered.
  • the magnet 31x is arranged only at one end of the heat receiver 21x, and in order to obtain a magnetic field capable of driving the magnetic fluid 40, the size of the magnet 31x is increased. Further, even though the heat source 11 is on the lower side, the low-temperature magnetic fluid 40 gathers on the upper side due to the magnetic force, and the cooling efficiency is lowered.
  • FIG. 6B in addition to the same configuration as the magnetic fluid driving device 10x of FIG. 6A, the magnetic fluid driving device 10y in which the second magnet 31y is arranged on the ⁇ Y side of the heat source 11 is provided. It is illustrated. In this case, it is expected that the second magnet 31y facing the first magnet 31x strengthens the magnetic field applied to the heat receiver 21x.
  • the second magnet 31y is far from the heat receiver 21x by the amount of the heat source 11, the contribution of the magnet 31y becomes small. Further, since various other components are usually present around the heat source 11 inside the electronic device in which the magnetic fluid driving device 10y is incorporated, in the configuration of FIG. 6B, the two magnets 31x, 31y It is assumed that it is difficult to make them face each other in close proximity.
  • the magnetic fluid drive device 10 of the present embodiment as shown in FIG. 2 and the like, by arranging the magnets 31 and 32 on the short side side of the heat receiver 21, the magnets 31 and 32 interfere with the arrangement of the heat source 11 and the like.
  • the two magnets 31 and 32 can be opposed to each other without doing so.
  • a magnetic field capable of driving the magnetic fluid 40 using the flat heat receiver 21 can be easily obtained, and the driving of the magnetic fluid 40 can be efficiently realized.
  • the magnetic fluid driving device 10 in the present embodiment drives the temperature-sensitive magnetic fluid 40 in response to heat reception from the outside such as the heat source 11.
  • the magnetic fluid drive device 10 includes a heat receiver 21 and magnets 31 and 32, which are examples of magnetic members.
  • the heat receiver 21 is connected to the flow path pipes 41 and 42 through which the magnetic fluid 40 flows.
  • a heat receiver 21 that receives heat is configured.
  • the magnetic member includes, for example, two magnets 31 and 32, and generates a magnetic field between the main surfaces 31a and 32a as a pair of facing surfaces.
  • the heat receiver 21 has a size larger than the Z direction and the Y direction (vertical direction) that intersects the X direction in the X direction (width direction) that intersects the Z direction (flow direction) in which the magnetic fluid 40 flows through the flow path 20.
  • the magnetic members are arranged so that the main surfaces 31a and 32a of the magnets 31 and 32 are located on both sides of the heat receiver 21 in the X direction and face each other via the heat receiver 21.
  • the heat receiver 21 is along the width direction.
  • the heat source 11 can be easily arranged adjacent to the heat source 11.
  • the magnetic fluid driving device 10 can efficiently receive heat from the heat source 11, and can efficiently drive the magnetic fluid 40 according to the heat received from the heat source 11.
  • the main surfaces 31a and 32a of the magnets 31 and 32 as a pair of facing surfaces form, for example, magnetic poles having opposite polarities.
  • the magnetic fields H between the magnets 31 and 32 can be strengthened to efficiently drive the magnetic fluid 40.
  • the magnetic member of the ferrofluid drive device 10 includes two magnets 31 and 32 arranged to face each other so as to form a pair of facing surfaces.
  • the drive of the magnetic fluid 40 can be easily realized by a simple configuration in which the two magnets 31 and 32 face each other.
  • the magnetic fluid drive device 10 further includes a radiator 12.
  • the radiator 12 is connected to the flow path pipes 41 and 42 to dissipate heat from the magnetic fluid 40.
  • the heat source 11 can be cooled by the magnetic fluid 40 in a cyclical manner.
  • the heat transport system 1 includes a heat source 11 and a magnetic fluid drive device 10.
  • the heat source 11 is adjacent in the Y direction, for example, on the ⁇ Y side of the heat receiver 21, and is arranged along X. That is, the heat source 11 is arranged adjacent to a surface formed by the width direction and the flow direction of the outer circumference of the heat receiver 21.
  • the magnetic fluid driving device 10 drives the magnetic fluid 40 in response to the heat received from the heat source 11. According to the heat transport system 1, the magnetic fluid drive device 10 efficiently drives the magnetic fluid 40 in response to the heat received from the heat source 11, and can transport heat such as cooling of the heat source 11.
  • FIG. 7 shows a modification 1 of the magnetic fluid driving device 10 according to the first embodiment.
  • the magnetic fluid driving device 10 in this modification may include a heat receiver 21A having an elliptical or oval cross-sectional shape, as illustrated in FIG.
  • the shape of the heat receiver 21A has various shapes that are orthogonal to the flow direction of the flow path 20 within a tolerance, that is, have a width direction that intersects the flow direction and a vertical direction that intersects the flow direction and the width direction. It may be in shape.
  • the flow path tubes 41 and 42 having the same shape as the heat receiver 21 may be connected to the radiator 12 (see FIG. 1). That is, the heat receiver 21A and the pipe portion 22 do not have to be particularly distinguished by their shape or the like.
  • FIG. 8 shows a modification 2 of the magnetic fluid driving device 10 according to the first embodiment.
  • the magnetic fluid drive device 10 includes magnets 31A and 32A having a size larger than the size of the heat receiver 21 in the Y direction in the same configuration as in the first embodiment.
  • the magnets 31A and 32A are arranged so as to face each other so that the heat receiver 21 is located near the center in the Y direction.
  • the facing main surfaces of the magnets 31A and 32A are examples of facing surfaces of the magnetic member.
  • the facing surfaces of the magnets 31A and 32A as magnetic members in the magnetic fluid driving device 10 may have a size larger than the size of the heat receiver 21 in the Y direction.
  • the uniformity of the magnetic field applied to the magnetic fluid 40 in the flow path 20 of the heat receiver 21 can be improved, and a high-strength range can be effectively used.
  • FIG. 9 shows a modification 3 of the magnetic fluid driving device 10 according to the first embodiment.
  • the magnetic fluid drive device 10 further includes a magnetic yoke 33 as illustrated in FIG. 9, in addition to the same configuration as in the first embodiment.
  • the magnetic yoke 33 is formed in a U shape and is connected to the two magnets 31 and 32 across the + Y side of the heat receiver 21.
  • the magnetic yoke 33 and the magnets 31 and 32 may be physically directly coupled or magnetically coupled.
  • the magnets 31 and 32 are connected to the flow path of the heat receiver 21 by magnetically coupling the magnetic yoke 33 and the magnets 31 and 32 via the side wall on the ⁇ X side of the heat receiver 21. It is also possible to arrange it within 20.
  • the magnetic member in the magnetic fluid driving device 10 may further include a magnetic yoke 33 connected to the magnets 31 and 32.
  • the magnetic field applied to the heat receiver 21 can be strengthened by the magnetic circuit composed of the magnets 31 and 32 and the magnetic yoke 33.
  • the magnetic fluid driving device according to the present embodiment will be described by omitting the description of the configuration and operation similar to the heat transport system 1 and the magnetic fluid driving device 10 of the first embodiment as appropriate.
  • FIG. 10 is a perspective view showing a configuration example of the magnetic fluid drive device 10A according to the second embodiment.
  • the magnetic fluid drive device 10A according to the present embodiment includes an additional magnet 30 arranged in the middle of the flow path 20 in the heat receiver 21 in addition to the same configuration as that of the first embodiment (see FIG. 2).
  • the additional magnet 30 is configured in the same manner as the other magnets 31 and 32, for example.
  • the orientation of the magnet 30 and the positions in the Y and Z directions are also the same as those of the other magnets 31 and 32, for example.
  • FIG. 11 shows a front view of the magnetic fluid drive device 10A of FIG.
  • the additional magnet 30 is arranged at an intermediate position such as the center of the flow path 20 in the X direction.
  • the additional magnet 30 is an example of an intermediate portion of the magnetic member in this embodiment.
  • Each main surface of the magnet 30 constitutes a magnetic pole having a polarity opposite to that of the main surfaces 31a and 32a of the magnets 31 and 32 facing each other.
  • the distribution unevenness of the magnetic flux density can be reduced in the flow path 20 of the heat receiver 21 by the three magnets 30 to 32 arranged in the X direction.
  • the inventor of the present application performed a simulation by numerical calculation. The simulation of the magnetic flux density in the magnetic fluid driving device 10A will be described with reference to FIG.
  • FIG. 12A is a graph showing a simulation result in the magnetic fluid driving device 10A of the present embodiment.
  • FIG. 12B shows a simulation result in the magnetic fluid driving device 10x of the first assumed example described above.
  • FIG. 12A shows the distribution of the magnetic flux density in the AA cross section of FIG.
  • FIG. 12B shows the distribution of the magnetic flux density in the same cross section as the above AA cross section in FIG. 6A.
  • the individual sizes of the three magnets 30 to 32 were set to 30 mm ⁇ 10 mm ⁇ 5 mm.
  • the size of the magnet 31x was set to 30 mm ⁇ 30 mm ⁇ 5 mm so that the volume of the magnet used was the same as that of FIG. 12 (A).
  • the configuration of the magnetic fluid driving device 10A of the present embodiment can obtain a magnetic flux density of about 1.46 times that of the case of FIG. Further, according to the configuration of the present embodiment, as shown in FIG. 12A, the uneven distribution of the magnetic flux density is reduced as compared with FIG. 12B. As a result, according to the magnetic fluid driving device 10A of the present embodiment, it was confirmed that the efficiency of driving the magnetic fluid 40 can be improved, such as making it possible to increase the flow rate of the magnetic fluid 40 in the heat receiver 21.
  • the magnetic member in the magnetic fluid driving device 10A is located between the main surfaces 31a and 32a of the two magnets 31 and 32 which are a pair of facing surfaces, and is composed of an additional magnet 30. It has an intermediate part to be magnetized. As a result, the uniformity of the magnetic field in the flow path 20 of the heat receiver 21 can be improved, and the efficiency of driving the magnetic fluid 40 can be improved.
  • FIG. 13 is a perspective view showing a modified example of the magnetic fluid driving device 10A according to the second embodiment.
  • the magnet 30 may be isolated from the flow path 20 of the heat receiver 21.
  • FIG. 14 shows a front view of the magnetic fluid drive device 10A of FIG.
  • the magnetic fluid drive device 10A is provided with a hollow wall portion 23 for isolating the magnet 30 from the flow path 20.
  • the wall portion 23 is provided, for example, in the heat receiver 21 so as to surround a gap extending in the Z direction at an intermediate position in the X direction, and constitutes a part of the magnetic fluid driving device 10A.
  • the magnet 30 can be arranged at an intermediate position by inserting it into the gap formed by the wall portion 23.
  • the heat receiver 21 may include a wall portion 23 provided so as to isolate the magnet 30 in the intermediate portion from the flow path 20. As a result, the magnet 30 in the intermediate portion can be prevented from coming into direct contact with the magnetic fluid 40.
  • the magnetic fluid drive device according to the present embodiment will be described by omitting the description of the configuration and operation similar to those of the first and second embodiments as appropriate.
  • FIG. 15 shows a configuration example of the magnetic fluid drive device 10B according to the third embodiment.
  • the magnetic fluid drive device 10 of the present embodiment has, for example, a magnetic yoke having a protrusion 35a as an intermediate portion of the magnetic member instead of the additional magnet 30 in the same configuration as the modification of the second embodiment (see FIG. 13). 35 is provided.
  • FIG. 16 illustrates the magnetic member of the magnetic fluid drive device 10B in this embodiment.
  • the magnetic yoke 35 of the present embodiment has, for example, an E-shaped cross-sectional shape, and an intermediate portion is formed by a central protrusion 35a.
  • the magnetic yoke 35 is connected to two magnets 31 and 32 forming facing surfaces at both ends.
  • the protrusion 35a of the magnetic yoke 35 is inserted into the gap of the wall portion 23 of the heat receiver 21.
  • the magnetic yoke 35 and the protrusion 35a are magnetized by the magnets 31 and 32, and the magnetic field can be appropriately induced in the heat receiver 21.
  • the magnetic member in the magnetic fluid driving device 10B is located between the main surfaces 31a and 32a of the two magnets 31 and 32 which are a pair of facing surfaces, and the protrusion of the magnetic yoke 35. It includes an intermediate portion composed of 35a. This also makes it possible to improve the efficiency of driving the magnetic fluid 40, as in the second embodiment. Further, the wall portion 23 provided so as to isolate the intermediate portion from the flow path 20 can be used so that the protruding portion 35a as the intermediate portion does not come into contact with the magnetic fluid 40.
  • FIG. 17 shows a modified example of the magnetic fluid driving device 10B according to the third embodiment.
  • the magnetic fluid drive device 10B of the present modification has the same configuration as that of the third embodiment (see FIG. 15), and is formed in an E shape by incorporating magnets 31B and 32B instead of the magnetic member of FIG. To be equipped.
  • FIG. 18 illustrates a magnetic member of this modified example.
  • the two magnets 31B and 32B are coupled between the three magnetic yokes 36a, 36b and 36c.
  • the two magnets 31B and 32B are located on the long side of the heat receiver 21 and on the opposite side (+ Y side) of the heat source 11.
  • the two magnetic yokes 36a and 36c are, for example, L-shaped or I-shaped, and are located at both ends on the short side of the heat receiver 21.
  • the magnetic yokes 36a and 36c are connected to separate magnets 31 and 32.
  • the two magnetic yokes 36a and 36c form a pair of facing surfaces.
  • the remaining magnetic yoke 36b is, for example, T-shaped or I-shaped and is coupled between the two magnets 31B and 32B.
  • the magnetic yoke 36b is inserted into the gap of the wall portion 23 to form an intermediate portion.
  • the magnetic fluid driving device according to the present embodiment will be described by omitting the description of the configuration and operation similar to those of the first to third embodiments as appropriate.
  • FIG. 19 shows a configuration example of the magnetic fluid drive device 10C according to the fourth embodiment.
  • the magnetic fluid drive device 10C of the present embodiment includes magnets 31C and 32C in a Halbach array at both ends of the heat receiver 21 in the same configuration as the modification of the second embodiment (see FIG. 14).
  • FIG. 20 illustrates the magnetic member of the magnetic fluid drive device 10C in this embodiment.
  • FIG. 20 illustrates the magnetic poles of the magnets 31C, 32C, and 30 arranged in the same manner as in FIG. As shown in FIG. 20, by adopting a Halbach array that strengthens the magnetic fields between the magnets 31C and 32C facing each other in the flow path 20 of the heat receiver 21, the magnetic field stronger than the magnetic fluid 40 in the flow path 20 Can be applied.
  • the magnet 30 in the intermediate portion is arranged between the magnets 31C and 32C
  • the magnet 30 in the intermediate portion may not be arranged.
  • the Halbach array that strengthens the magnetic fields between the facing surfaces can be adopted for the magnets 31C and 32C.
  • the magnetic member of the magnetic fluid drive device 10C includes a plurality of magnets 31C and 32C arranged in a Halbach array so as to strengthen the magnetic fields between the pair of facing surfaces. As a result, the magnetic field in the flow path 20 of the heat receiver 21 can be strengthened to increase the flow rate of the magnetic fluid 40.
  • Embodiments 1 to 4 have been described as examples of the techniques disclosed in this application. However, the technique in the present disclosure is not limited to this, and can be applied to embodiments in which changes, substitutions, additions, omissions, etc. are appropriately made. It is also possible to combine the components described in each of the above embodiments into a new embodiment. Therefore, other embodiments will be illustrated below.
  • the magnetic fluid driving device 10 using the two magnets 31 and 32 has been described.
  • the magnetic fluid drive device of the present embodiment may be configured by using one magnet. This modification will be described with reference to FIG.
  • FIG. 21 shows the magnetic fluid drive device 10D according to the first modification.
  • the magnetic fluid drive device 10D of the present modification includes, for example, in the same configuration as that of the first embodiment, instead of the magnetic member of FIG. 2, a magnetic member composed of one magnet 31D and magnetic yokes 37a and 37b.
  • the two magnetic yokes 37a and 37b form a pair of facing surfaces as in the magnetic member of FIG.
  • the magnetic yokes 37a and 37b are connected to the same magnet 31D. Even with such a magnetic fluid driving device 10, it is possible to efficiently drive the magnetic fluid 40 according to the heat received from the heat source 11.
  • FIG. 22 shows the magnetic fluid drive device 10E according to the second modification.
  • the magnetic fluid drive device 10E includes a heat receiver 21B in which the flow path 20 is branched into a plurality of branch flow paths 20a to 20c.
  • the heat receiver 21B By juxtaposing the plurality of branch flow paths 20a to 20c in the X direction, the heat receiver 21B has a larger size in the X direction (that is, the width direction) than in the Y direction (that is, the vertical direction).
  • a magnet 30 or the like can be installed as an intermediate portion in the gap between the branch flow paths 20a to 20c.
  • the flow path walls 20w of the branch flow paths 20a to 20c are examples of wall portions that isolate the intermediate portions.
  • each branch flow path 20a to 20c is formed in a pipe shape in the heat receiver 21B.
  • the pipe receiver 24 made of a high heat conductive member between the heat source 11 and the heat receiver 21B, it is possible to efficiently receive heat from the heat source 11 to the heat receiver 21B.
  • Such a high heat conductive member may be further added to the + Y side of each branch flow path 20a to 20c.
  • a permanent magnet is exemplified as a magnet included in the magnetic member of the magnetic fluid drive device 10.
  • the magnet in the magnetic member of the magnetic fluid drive device 10 does not necessarily have to be a permanent magnet, and may be, for example, an electromagnet.
  • a pair of facing surfaces may be formed by facing the two flat plate coils.
  • the heat transport system 1 of the present embodiment is not particularly limited to this.
  • the heat transport system 1 may use the magnetic fluid drive device 10 when cooling a heat source that is not a surface heat source.
  • the magnetic fluid drive device 10 constitutes the cooling mechanism of the heat source 11 in the heat transport system 1
  • the heat transport system 1 and the magnetic fluid drive device 10 are particularly used for the cooling mechanism.
  • the magnetic fluid drive device 10 can be used in various heat transport applications.
  • the magnetic fluid device 10 may be applied to an application for heating a lithium ion battery or the like when the ambient temperature is low.
  • the battery to be heated is arranged at the same position as the radiator 12 in the heat transport system 1 described above.
  • the present disclosure is applicable to, for example, applications for cooling components in various electronic devices, and is applicable to devices that generate heat due to light output, such as projectors. Further, it can be applied to various fields such as in-vehicle devices such as headlights and lithium ion batteries, and information devices such as PCs and smartphones.

Abstract

A magnetic fluid drive device (10) drives, in accordance with received heat, a magnetic fluid (40) that has temperature sensitivity. The magnetic fluid drive device comprises a heat receiver (21), and magnetic members (31, 32). The heat receiver includes a flow passage (20) through which the magnetic fluid flows, and receives heat. The magnetic members include at least one magnet, and generate a magnetic field between a pair of opposing surfaces (31a, 32a). The heat receiver has a size that is larger in a width direction (X), which crosses a flow direction (Z) in which the magnetic fluid flows in the flow passage, than in a vertical direction (Y), which crosses the flow direction and the width direction. The magnetic members are disposed so that the pair of opposing surfaces are positioned on both width-direction sides of the heat receiver and face each other via the heat receiver.

Description

磁性流体駆動装置および熱輸送システムFerrofluid drive and heat transport system
　本開示は、磁性流体駆動装置および磁性流体駆動装置を備えた熱輸送システムに関する。 The present disclosure relates to a ferrofluid drive and a heat transport system including a ferrofluid drive.
　特許文献１は、加熱された磁性流体を移動させてその熱エネルギーまたは運動エネルギーを利用するシステムで使用される磁性流体駆動装置を開示している。特許文献１の磁性流体駆動装置は、磁性流体が封入された循環流路と、循環流路中に加熱部と磁場印加部とを備える。循環流路の流路断面内径直径を小さくして、装置の小型化が図られている。この磁性流体駆動装置の適用例として、磁場印加部と発熱部を設けたヒートパイプ等による熱輸送装置が開示されている。 Patent Document 1 discloses a magnetic fluid driving device used in a system in which a heated magnetic fluid is moved and its thermal energy or kinetic energy is utilized. The magnetic fluid driving device of Patent Document 1 includes a circulation flow path in which the magnetic fluid is sealed, and a heating unit and a magnetic field application unit in the circulation flow path. The device is downsized by reducing the inner diameter of the cross section of the circulation flow path. As an application example of this magnetic fluid driving device, a heat transport device using a heat pipe or the like provided with a magnetic field application part and a heat generating part is disclosed.
　特許文献２は、管の中を流れる熱媒体を熱源として用い、効率よく磁性流体を駆動して熱輸送する手段としての磁性流体駆動装置を開示している。特許文献２の磁性流体駆動装置は、内側管及び内側管の外側に形成された外側管を有する二重管と、二重管の外側に配置された磁場印加部とを備えている。特許文献２では、内側管内に熱媒体を流通させることによって、磁性流体を駆動させている。 Patent Document 2 discloses a magnetic fluid driving device as a means for efficiently driving a magnetic fluid and transporting heat by using a heat medium flowing in a tube as a heat source. The magnetic fluid driving device of Patent Document 2 includes a double tube having an inner tube and an outer tube formed outside the inner tube, and a magnetic field application portion arranged outside the double tube. In Patent Document 2, a magnetic fluid is driven by circulating a heat medium in an inner tube.
特開２０１４－５０１４０号公報Japanese Unexamined Patent Publication No. 2014-50140 特開２０１８－５９４８４号公報JP-A-2018-59484
　本開示は、熱源からの受熱に応じた磁性流体の駆動を効率良くすることができる磁性流体駆動装置及び熱輸送システムを提供する。 The present disclosure provides a magnetic fluid driving device and a heat transport system capable of efficiently driving a magnetic fluid in response to heat reception from a heat source.
　本開示に係る磁性流体駆動装置は、感温性を有する磁性流体を、受熱に応じて駆動する装置である。磁性流体駆動装置は、受熱器と、磁性部材とを備える。受熱器は、磁性流体が流れる流路を有し、熱を受熱する。磁性部材は、少なくとも１つの磁石を含み、１対の対向面の間に磁界を生じる。受熱器は、流路に磁性流体を流す流れ方向と交差する幅方向において、流れ方向及び幅方向と交差する垂直方向よりも大きいサイズを有する。磁性部材は、１対の対向面が幅方向における受熱器の両側に位置して、受熱器を介して互いに対向するように配置される。 The magnetic fluid driving device according to the present disclosure is a device that drives a magnetic fluid having temperature sensitivity in response to heat reception. The ferrofluid drive device includes a heat receiver and a magnetic member. The heat receiver has a flow path through which the magnetic fluid flows and receives heat. The magnetic member includes at least one magnet and creates a magnetic field between the pair of facing surfaces. The heat receiver has a size larger in the width direction intersecting the flow direction in which the magnetic fluid flows in the flow path than in the vertical direction intersecting the flow direction and the width direction. The magnetic members are arranged so that a pair of facing surfaces are located on both sides of the heat receiver in the width direction and face each other via the heat receiver.
　本開示に係る熱輸送システムは、熱源と、上記の磁性流体駆動装置とを備える。熱源は、受熱器外周の幅方向と流れ方向からなる面に隣接して配置される。磁性流体駆動装置は、熱源からの熱に応じて磁性流体を駆動する。 The heat transport system according to the present disclosure includes a heat source and the above-mentioned magnetic fluid drive device. The heat source is arranged adjacent to a surface formed by the width direction and the flow direction of the outer circumference of the heat receiver. The ferrofluid drive device drives a ferrofluid in response to heat from a heat source.
　本開示に係る磁性流体駆動装置及び熱輸送システムによると、熱源からの受熱に応じた磁性流体の駆動を効率良くすることができる。 According to the magnetic fluid driving device and the heat transport system according to the present disclosure, it is possible to efficiently drive the magnetic fluid according to the heat received from the heat source.
本開示の実施形態１に係る熱輸送システムの構成を例示する図The figure which illustrates the structure of the heat transport system which concerns on Embodiment 1 of this disclosure. 実施形態１の熱輸送システムにおける磁性流体駆動装置の構成例を示す斜視図Perspective view showing a configuration example of a magnetic fluid drive device in the heat transport system of the first embodiment. 図２の磁性流体駆動装置の前面図Front view of the magnetic fluid drive device of FIG. 図２の磁性流体駆動装置の側面図Side view of the magnetic fluid drive device of FIG. 熱輸送システムにおける磁性流体駆動装置の動作原理を説明した図The figure explaining the operating principle of the magnetic fluid drive device in a heat transport system 受熱器の適用例における磁性流体駆動装置を例示する図The figure which illustrates the magnetic fluid drive device in the application example of a heat receiver 実施形態１に係る磁性流体駆動装置の変形例１を示す斜視図A perspective view showing a modification 1 of the magnetic fluid drive device according to the first embodiment. 実施形態１に係る磁性流体駆動装置の変形例２を示す斜視図A perspective view showing a modification 2 of the magnetic fluid drive device according to the first embodiment. 実施形態１に係る磁性流体駆動装置の変形例３を示す斜視図A perspective view showing a modification 3 of the magnetic fluid drive device according to the first embodiment. 実施形態２に係る磁性流体駆動装置の構成例を示す斜視図Perspective view showing the configuration example of the magnetic fluid drive device which concerns on Embodiment 2. 図１０の磁性流体駆動装置の前面図Front view of the magnetic fluid drive device of FIG. 磁性流体駆動装置におけるシミュレーション結果を示す図The figure which shows the simulation result in the magnetic fluid drive device 実施形態２に係る磁性流体駆動装置の変形例を示す斜視図A perspective view showing a modified example of the magnetic fluid driving device according to the second embodiment. 図１３の磁性流体駆動装置の前面図Front view of the magnetic fluid drive device of FIG. 実施形態３に係る磁性流体駆動装置の構成例を示す斜視図Perspective view showing a configuration example of the magnetic fluid drive device according to the third embodiment. 実施形態３における磁性流体駆動装置の磁性部材を例示する図The figure which illustrates the magnetic member of the magnetic fluid drive device in Embodiment 3. 実施形態３に係る磁性流体駆動装置の変形例を示す斜視図A perspective view showing a modified example of the magnetic fluid driving device according to the third embodiment. 実施形態３の変形例における磁性流体駆動装置の磁性部材を例示する図The figure which illustrates the magnetic member of the magnetic fluid drive device in the modification of Embodiment 3. 実施形態４に係る磁性流体駆動装置の構成例を示す斜視図Perspective view showing a configuration example of the magnetic fluid drive device according to the fourth embodiment. 実施形態４における磁性流体駆動装置の磁性部材を例示する図The figure which illustrates the magnetic member of the magnetic fluid drive device in Embodiment 4. 変形例１に係る磁性流体駆動装置の構成例を示す斜視図Perspective view showing a configuration example of the magnetic fluid drive device according to the first modification. 変形例２に係る磁性流体駆動装置を示す斜視図Perspective view which shows the magnetic fluid drive device which concerns on modification 2.
　以下、適宜図面を参照しながら、実施の形態を詳細に説明する。但し、必要以上に詳細な説明は省略する場合がある。例えば、既によく知られた事項の詳細説明や実質的に同一の構成に対する重複説明を省略する場合がある。これは、以下の説明が不必要に冗長になるのを避け、当業者の理解を容易にするためである。 Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description and to facilitate the understanding of those skilled in the art.
　なお、出願人は、当業者が本開示を十分に理解するために添付図面および以下の説明を提供するのであって、これらによって特許請求の範囲に記載の主題を限定することを意図するものではない。 It should be noted that the applicant is not intended to limit the subject matter described in the claims by those skilled in the art by providing the accompanying drawings and the following description in order to fully understand the present disclosure. Absent.
（実施形態１）
　以下、図面を用いて、本開示の実施形態１を説明する。 (Embodiment 1)
Hereinafter, the first embodiment of the present disclosure will be described with reference to the drawings.
１．構成
１－１．熱輸送システムについて
　実施形態１に係る熱輸送システムについて、図１を用いて説明する。 1. 1. Configuration 1-1. Heat Transport System The heat transport system according to the first embodiment will be described with reference to FIG.
　図１は、本実施形態に係る熱輸送システム１の構成を例示する。熱輸送システム１は、磁性流体駆動装置１０と、熱源１１とを備える。本実施形態の熱輸送システム１は、例えば種々の電子機器に組み込まれ、磁性流体駆動装置１０が同機器の構成部品において発熱を伴う熱源１１を冷却する冷却機構を構成するように熱の輸送を行う。 FIG. 1 illustrates the configuration of the heat transport system 1 according to the present embodiment. The heat transport system 1 includes a magnetic fluid driving device 10 and a heat source 11. The heat transport system 1 of the present embodiment is incorporated in, for example, various electronic devices, and transports heat so that the magnetic fluid drive device 10 constitutes a cooling mechanism for cooling a heat source 11 accompanied by heat generation in the components of the device. Do.
　本実施形態の磁性流体駆動装置１０は、図１に示すように、受熱器２１と、磁石３１，３２と、放熱器１２と流路管４１、４２を備える。受熱器２１及び流路管４１、４２には、磁化の温度依存性すなわち感温性を有する磁性流体が封入される。本実施形態の磁性流体駆動装置１０は、磁性流体に作用する磁気体積力の温度変化を利用して、熱源１１等の外部からの受熱に応じて磁性流体を自己循環的に駆動する装置である。 As shown in FIG. 1, the magnetic fluid drive device 10 of the present embodiment includes a heat receiver 21, magnets 31 and 32, a radiator 12, and flow path tubes 41 and 42. A magnetic fluid having a temperature dependence of magnetization, that is, temperature sensitivity, is sealed in the heat receiver 21 and the flow path tubes 41 and 42. The magnetic fluid driving device 10 of the present embodiment is a device that self-circulates the magnetic fluid in response to heat reception from the outside such as a heat source 11 by utilizing the temperature change of the magnetic body force acting on the magnetic fluid. ..
　本実施形態では、熱源１１として、面状に発熱する面熱源を想定している。熱源１１は、例えば電子機器がプロジェクタである場合、半導体レーザ又はＬＥＤアレイといった光源素子、ＤＭＤなどの空間光変調素子、蛍光体素子および光学系などである。又、プロジェクタに特に限らず、種々の機器におけるＣＰＵ又はＬＳＩなどの半導体素子、及び二次電池なども、面状の熱源１１の一例である。 In this embodiment, as the heat source 11, a surface heat source that generates heat in a planar manner is assumed. The heat source 11 is, for example, a light source element such as a semiconductor laser or an LED array, a spatial light modulation element such as a DMD, a phosphor element, an optical system, or the like when the electronic device is a projector. Further, not only a projector but also a semiconductor element such as a CPU or an LSI in various devices, a secondary battery, and the like are examples of a planar heat source 11.
　従来の磁性流体を用いた冷却機構は、熱源からの受熱を円形のパイプで行っている（例えば特許文献１，２）。本願発明者の鋭意研究によると、このような従来技術では、熱源１１が面状である場合に熱源１１からの受熱を効率良く行うことが困難であるという問題が明らかとなった。 A conventional cooling mechanism using a magnetic fluid receives heat from a heat source with a circular pipe (for example, Patent Documents 1 and 2). According to the diligent research of the inventor of the present application, it has become clear that in such a conventional technique, it is difficult to efficiently receive heat from the heat source 11 when the heat source 11 is planar.
　上記の問題に対して、本願発明者は鋭意検討を重ね、受熱器２１に扁平した形状を用いて面状の熱源１１からの受熱を効率良く行える熱輸送システム１を考案するに到った。 With respect to the above problems, the inventor of the present application has made extensive studies and has come up with a heat transport system 1 that can efficiently receive heat from a planar heat source 11 by using a flat shape for the heat receiver 21.
　受熱器２１は、磁性流体が流れる流路を形成する管状部材であり、例えば流路管４１、４２との接続部を備える。受熱器２１は、磁性流体駆動装置１０の流路において磁性流体が熱源１１からの熱を受熱する部分である。流路管４１、４２は、磁性流体を受熱器２１と放熱器１２の間で循環させる流路に対応する部分である。 The heat receiver 21 is a tubular member that forms a flow path through which the magnetic fluid flows, and includes, for example, a connection portion with the flow path tubes 41 and 42. The heat receiver 21 is a portion in the flow path of the magnetic fluid driving device 10 where the magnetic fluid receives heat from the heat source 11. The flow path pipes 41 and 42 are portions corresponding to the flow path for circulating the magnetic fluid between the heat receiver 21 and the radiator 12.
　本実施形態の磁性流体駆動装置１０は、磁性流体を駆動するための磁界を生じさせる磁性部材の一例として、２つの磁石３１，３２を用いる。磁石３１，３２は、例えばネオジム磁石、フェライト磁石或いは、サマリウムコバルト磁石といった永久磁石である。磁性部材および受熱器２１等の磁性流体駆動装置１０の構造の詳細については後述する。 The magnetic fluid driving device 10 of the present embodiment uses two magnets 31 and 32 as an example of a magnetic member that generates a magnetic field for driving the magnetic fluid. The magnets 31 and 32 are permanent magnets such as neodymium magnets, ferrite magnets, and samarium-cobalt magnets. Details of the structure of the magnetic fluid driving device 10 such as the magnetic member and the heat receiver 21 will be described later.
　磁性流体は、強磁性粒子と、強磁性粒子が分散された母液とを含む。強磁性粒子は、例えば、酸化鉄系微粒子、或いはスピネルフェライト等であってもよい。磁性流体の母液としては、水、或いはケロシンなどの炭化水素系を用いることができる。磁性流体は、コロイドであってもよいし、マイクロカプセル技術を用いて構成されもよい（非特許文献１参照）。磁性流体の感温性は、熱源１１の発熱によって想定される温度とキュリー温度を考慮して、適宜設定される。 The magnetic fluid contains ferromagnetic particles and a mother liquor in which the ferromagnetic particles are dispersed. The ferromagnetic particles may be, for example, iron oxide-based fine particles, spinel ferrite, or the like. As the mother liquor of the magnetic fluid, water or a hydrocarbon system such as kerosine can be used. The magnetic fluid may be colloidal or may be constructed using microcapsule technology (see Non-Patent Document 1). The temperature sensitivity of the magnetic fluid is appropriately set in consideration of the temperature assumed by the heat generated by the heat source 11 and the Curie temperature.
　放熱器１２は、受熱器２１から流路管４２を介して流入する高温となった磁性流体を放熱する。放熱器１２は、放熱した磁性流体を再度、受熱器２１に循環させるように流路管４１に接続される。放熱器１２は、各種のヒートシンクで構成可能である。放熱器１２は、ペルチェ素子を用いたラジエータであってもよい。なお、磁性流体駆動装置１０は、放熱器１２とは別体で提供されてもよい。 The radiator 12 dissipates the hot magnetic fluid flowing from the heat receiver 21 through the flow path tube 42. The radiator 12 is connected to the flow path pipe 41 so as to circulate the radiated magnetic fluid to the heat receiver 21 again. The radiator 12 can be configured with various heat sinks. The radiator 12 may be a radiator using a Peltier element. The magnetic fluid drive device 10 may be provided separately from the radiator 12.
１－２．磁性流体駆動装置について
　実施形態１における磁性流体駆動装置１０の構造の詳細を、図２～図４を用いて説明する。 1-2. About the magnetic fluid driving device The details of the structure of the magnetic fluid driving device 10 in the first embodiment will be described with reference to FIGS. 2 to 4.
　図２は、本実施形態の熱輸送システム１における磁性流体駆動装置１０の構成例を示す斜視図である。図２では、受熱器２１において流路２０が開口した状態を例示している（以下同様）。 FIG. 2 is a perspective view showing a configuration example of the magnetic fluid drive device 10 in the heat transport system 1 of the present embodiment. FIG. 2 illustrates a state in which the flow path 20 is opened in the heat receiver 21 (the same applies hereinafter).
　本実施形態の磁性流体駆動装置１０において、受熱器２１は、流路２０が長辺および短辺を有する矩形の断面形状を有する。以下、受熱器２１の流路２０において磁性流体を流す流れ方向をＺ方向とし、Ｚ方向に直交して上記の長辺に平行な長辺方向をＸ方向とし、Ｚ，Ｘ方向に直交して上記の短辺に平行な短辺方向をＹ方向とする。 In the magnetic fluid drive device 10 of the present embodiment, the heat receiver 21 has a rectangular cross-sectional shape in which the flow path 20 has a long side and a short side. Hereinafter, the flow direction in which the magnetic fluid flows in the flow path 20 of the heat receiver 21 is defined as the Z direction, the long side direction orthogonal to the Z direction and parallel to the long side is defined as the X direction, and the directions are orthogonal to the Z and X directions. The short side direction parallel to the short side is defined as the Y direction.
　受熱器２１は、長辺に沿った±Ｙ側の２つの主面と、短辺に沿った±Ｘ側の２つの主面とを有する。受熱器２１において、±Ｙ側の各主面すなわち長辺側の側面のサイズは、±Ｘ側の各主面すなわち短辺側の側面のサイズよりも大きい。Ｘ，Ｙ方向は、それぞれ本実施形態の磁性流体駆動装置１０における幅方向及び垂直方向の一例である。 The heat receiver 21 has two main surfaces on the ± Y side along the long side and two main surfaces on the ± X side along the short side. In the heat receiver 21, the size of each main surface on the ± Y side, that is, the side surface on the long side is larger than the size of each main surface on the ± X side, that is, the side surface on the short side. The X and Y directions are examples of the width direction and the vertical direction in the magnetic fluid driving device 10 of the present embodiment, respectively.
　熱輸送システム１における熱源１１は、例えば面状に発熱する発熱面１１ａを有する。発熱面１１ａは、熱源１１となる各種部品の形状、構造及び配置等に応じた種々の起伏を有してもよい。熱源１１は、例えば発熱面１１ａを＋Ｙ側に向けて、受熱器２１の－Ｙ側に隣接して配置される。発熱面１１ａは、例えばＸ，Ｚ方向に平行など、受熱器２１の長辺側の側面に沿って配置される。これにより、発熱面１１ａと受熱器２１とが近接する面積を大きく確保し、熱源１１から受熱器２１への熱移動を効率良くすることができる。 The heat source 11 in the heat transport system 1 has, for example, a heat generating surface 11a that generates heat in a planar shape. The heat generating surface 11a may have various undulations depending on the shape, structure, arrangement, and the like of various parts serving as the heat source 11. The heat source 11 is arranged adjacent to the −Y side of the heat receiver 21, for example, with the heat generating surface 11a facing the + Y side. The heat generating surface 11a is arranged along the side surface on the long side of the heat receiving device 21, for example, parallel to the X and Z directions. As a result, a large area in which the heat generating surface 11a and the heat receiving device 21 are close to each other can be secured, and heat transfer from the heat source 11 to the heat receiving device 21 can be made efficient.
　図３は、図２の磁性流体駆動装置１０を－Ｚ側から見た前面図を示す。本実施形態における磁性流体駆動装置１０の２つの磁石３１，３２は、Ｘ方向において受熱器２１を介して対向するように、受熱器２１の短辺側の両端（即ち±Ｘ側）に隣接して配置される。２つの磁石３１，３２は、例えば同じ寸法を有する。各磁石３１，３２は、例えば平板状に形成され、それぞれ２つの主面を有する。各磁石３１，３２の主面は、例えばＹ，Ｚ方向に平行など、受熱器２１の短辺側の側面に沿って配置される。 FIG. 3 shows a front view of the magnetic fluid driving device 10 of FIG. 2 as viewed from the −Z side. The two magnets 31 and 32 of the magnetic fluid drive device 10 in the present embodiment are adjacent to both ends (that is, ± X side) on the short side of the heat receiver 21 so as to face each other via the heat receiver 21 in the X direction. Is placed. The two magnets 31, 32 have, for example, the same dimensions. Each of the magnets 31 and 32 is formed in a flat plate shape, for example, and each has two main surfaces. The main surfaces of the magnets 31 and 32 are arranged along the side surface on the short side side of the heat receiver 21, for example, parallel to the Y and Z directions.
　図３では、磁性流体駆動装置１０における各磁石３１，３２の磁極の極性を例示している。例えば、磁石３１，３２の各主面がＮ極またはＳ極を構成する。一方の磁石３１において受熱器２１に隣接する主面３１ａと、他方の磁石３２において受熱器２１に隣接する主面３２ａとは、互いに逆の極性を有する。こうした２つの磁石３１，３２の対向する主面３１ａ，３２ａは、本実施形態における１対の対向面の一例である。 FIG. 3 illustrates the polarities of the magnetic poles of the magnets 31 and 32 in the ferrofluid drive device 10. For example, each main surface of the magnets 31 and 32 constitutes an north pole or an south pole. The main surface 31a of one magnet 31 adjacent to the heat receiver 21 and the main surface 32a of the other magnet 32 adjacent to the heat receiver 21 have opposite polarities. The facing main surfaces 31a and 32a of the two magnets 31 and 32 are an example of a pair of facing surfaces in the present embodiment.
　図４は、図２を－Ｘ側から見た側面図を示す。磁石３１，３２と熱源１１とは、磁性流体を流すＺ方向における位置を互いにずらして配置される。例えば、Ｚ方向において、熱源１１の発熱面１１ａが配置された範囲が、磁石３１，３２が配置された範囲の＋Ｚ側のおおよそ半分に重畳するように配置される。又、例えば発熱面１１ａの範囲は、磁石３１，３２の範囲より＋Ｚ側にも延在し得る。こうした配置の範囲は、磁性流体の駆動力を強くする観点から、各種条件に応じて適宜、設定される。本実施形態の磁性流体駆動装置１０によると、こうした熱源１１および磁石３１，３２の配置が、互いの干渉を意識すること無く微細に調整し易い。 FIG. 4 shows a side view of FIG. 2 as viewed from the −X side. The magnets 31 and 32 and the heat source 11 are arranged so as to be displaced from each other in the Z direction in which the magnetic fluid flows. For example, in the Z direction, the range in which the heat generating surface 11a of the heat source 11 is arranged is arranged so as to overlap approximately half of the + Z side of the range in which the magnets 31 and 32 are arranged. Further, for example, the range of the heat generating surface 11a may extend to the + Z side from the range of the magnets 31 and 32. The range of such arrangement is appropriately set according to various conditions from the viewpoint of strengthening the driving force of the magnetic fluid. According to the magnetic fluid driving device 10 of the present embodiment, the arrangement of the heat source 11 and the magnets 31 and 32 can be easily finely adjusted without being aware of mutual interference.
２．動作
　以上のように構成される熱輸送システム１及び磁性流体駆動装置１０の動作を以下説明する。 2. Operation The operations of the heat transport system 1 and the magnetic fluid drive device 10 configured as described above will be described below.
２－１．動作原理
　図５は、熱輸送システム１における磁性流体駆動装置１０の動作原理を説明した図である。図５は、図２を＋Ｙ側から見た平面図に対応している。 2-1. Operating Principle FIG. 5 is a diagram illustrating the operating principle of the magnetic fluid driving device 10 in the heat transport system 1. FIG. 5 corresponds to a plan view of FIG. 2 as viewed from the + Y side.
　熱輸送システム１の磁性流体駆動装置１０においては、例えば図５に示すように、受熱器２１中の磁性流体４０に、２つの磁石３１，３２からの磁界Ｈが印加される。これにより、磁性流体４０には、磁界Ｈの勾配および磁性流体４０の磁化に比例した磁気体積力が作用する（特許文献１，２参照）。図５では、－Ｚ側における磁気体積力Ｆ１と、＋Ｚ側における磁気体積力Ｆ２とを例示している。例えば熱源１１が発熱しておらず、磁性流体４０の温度が＋Ｚ側と－Ｚ側間で変わらない場合、各々の磁気体積力Ｆ１，Ｆ２が釣り合って、磁性流体４０は特に移動しないこととなる。 In the magnetic fluid drive device 10 of the heat transport system 1, for example, as shown in FIG. 5, the magnetic fields H from the two magnets 31 and 32 are applied to the magnetic fluid 40 in the heat receiver 21. As a result, a magnetic body force proportional to the gradient of the magnetic field H and the magnetization of the magnetic fluid 40 acts on the magnetic fluid 40 (see Patent Documents 1 and 2). In FIG. 5, the magnetic body force F1 on the −Z side and the magnetic body force F2 on the + Z side are illustrated. For example, when the heat source 11 does not generate heat and the temperature of the magnetic fluid 40 does not change between the + Z side and the −Z side, the respective magnetic body forces F1 and F2 are balanced, and the magnetic fluid 40 does not move in particular. ..
　熱源１１が発熱すると、磁性流体４０は、受熱器２１の＋Ｚ側において熱源１１からの熱を受熱する。これにより、＋Ｚ側の磁性流体４０の温度は、－Ｚ側よりも上昇する。磁性流体４０の感温性によると、温度が高くなると磁性流体４０の磁化は弱くなる。このため、＋Ｚ側の磁気体積力Ｆ２が弱くなり、±Ｚ側の磁気体積力Ｆ１，Ｆ２が釣り合わなくなる。すると、磁性流体４０に作用する力の全体として－Ｚ側の磁気体積力Ｆ１が優勢になり、磁性流体４０が－Ｚ側から＋Ｚ側へ流動するように駆動される。 When the heat source 11 generates heat, the magnetic fluid 40 receives heat from the heat source 11 on the + Z side of the heat receiver 21. As a result, the temperature of the magnetic fluid 40 on the + Z side rises higher than that on the −Z side. According to the temperature sensitivity of the magnetic fluid 40, the magnetization of the magnetic fluid 40 becomes weaker as the temperature rises. Therefore, the magnetic body force F2 on the + Z side becomes weak, and the magnetic body forces F1 and F2 on the ± Z side become unbalanced. Then, the magnetic body force F1 on the −Z side becomes dominant as a whole of the force acting on the magnetic fluid 40, and the magnetic fluid 40 is driven so as to flow from the −Z side to the + Z side.
　また、受熱器２１の＋Ｚ側において受熱し、高温となった磁性流体４０は、受熱器２１の＋Ｚ側から流出して流路管４２をさらに進み、放熱器１２に到る（図１参照）。放熱器１２は、磁性流体４０における熱を放熱する。これにより、放熱器１２を経由した磁性流体４０は、受熱器２１の流出時よりも温度が下がった状態で、－Ｚ側から受熱器２１に再度、流入できる。こうした循環は、熱源１１の発熱により受熱器２１に温度勾配がある限り、継続される。例えば熱源１１の発熱が一定の場合、熱的に均衡状態となり、磁性流体４０の流量は一定に維持される。熱源１１の発熱が停止すれば、磁性流体４０は、徐々に流量が低下し、やがて停止する。 Further, the magnetic fluid 40 that has received heat on the + Z side of the heat receiver 21 and has reached a high temperature flows out from the + Z side of the heat receiver 21 and further advances through the flow path tube 42 to reach the radiator 12 (see FIG. 1). .. The radiator 12 dissipates heat from the magnetic fluid 40. As a result, the magnetic fluid 40 that has passed through the radiator 12 can flow into the heat receiver 21 again from the −Z side in a state where the temperature is lower than that when the heat receiver 21 flows out. Such circulation is continued as long as the heat receiver 21 has a temperature gradient due to the heat generated by the heat source 11. For example, when the heat generated by the heat source 11 is constant, the thermal equilibrium state is reached, and the flow rate of the magnetic fluid 40 is maintained constant. When the heat generation of the heat source 11 is stopped, the flow rate of the magnetic fluid 40 gradually decreases, and then the magnetic fluid 40 is stopped.
　以上のように、本実施形態の熱輸送システム１は、磁性流体駆動装置１０において自己循環的に磁性流体４０を駆動して熱を輸送し、熱源１１を冷却することができる。 As described above, the heat transport system 1 of the present embodiment can self-circulate drive the magnetic fluid 40 in the magnetic fluid drive device 10 to transport heat and cool the heat source 11.
２－２．面熱源と磁性流体の駆動について
　上記のような熱輸送システム１における冷却の対象が面状の熱源１１である場合、円形パイプ等よりも扁平した受熱器２１において、長辺側の側面に熱源１１の発熱面１１ａを近接させることにより、受熱を効率良く行うことができる。一方、このような扁平した受熱器２１に単に従来技術を適用するだけでは、磁性流体４０の駆動を実現し難くする新たな問題点が、本願発明者の鋭意検討により明らかとなった。この点について、図６を用いて説明する。 2-2. Surface heat source and driving of magnetic fluid When the target of cooling in the heat transport system 1 as described above is a planar heat source 11, in a heat receiver 21 flatter than a circular pipe or the like, the heat source 11 is on the side surface on the long side. By bringing the heat generating surfaces 11a close to each other, heat can be efficiently received. On the other hand, a new problem that makes it difficult to drive the magnetic fluid 40 by simply applying the prior art to such a flat heat receiver 21 has been clarified by the diligent study of the inventor of the present application. This point will be described with reference to FIG.
　図６は、扁平した受熱器２１ｘの適用例における磁性流体駆動装置１０ｘ，１０ｙを例示する図である。図６（Ａ）は、受熱器２１ｘの第１の適用例による磁性流体駆動装置１０ｘの斜視図を示す。図６（Ｂ）は、第２の適用例による磁性流体駆動装置１０ｙの斜視図を示す。 FIG. 6 is a diagram illustrating magnetic fluid driving devices 10x and 10y in an application example of the flat heat receiver 21x. FIG. 6A shows a perspective view of the magnetic fluid driving device 10x according to the first application example of the heat receiver 21x. FIG. 6B shows a perspective view of the magnetic fluid driving device 10y according to the second application example.
　図６（Ａ）に例示するように、例えば、本実施形態の受熱器２１と同様に扁平した受熱器２１ｘに対して、長辺側における熱源１１の反対側（例えば＋Ｙ側）に磁石３１ｘを配置するような磁性流体駆動装置１０ｘの構成が考えられる。しかしながら、この適用例では磁石３１ｘが受熱器２１ｘの一端にしか配置されず、磁性流体４０を駆動可能な磁界を得るためには、磁石３１ｘの大型化を招く。また熱源１１が下側にあるにもかかわらず低温の磁性流体４０は磁力によって上側に集まることになり冷却効率が低下する。 As illustrated in FIG. 6A, for example, with respect to the flat heat receiver 21x similar to the heat receiver 21 of the present embodiment, a magnet 31x is placed on the opposite side (for example, + Y side) of the heat source 11 on the long side. A configuration of the magnetic fluid drive device 10x to be arranged can be considered. However, in this application example, the magnet 31x is arranged only at one end of the heat receiver 21x, and in order to obtain a magnetic field capable of driving the magnetic fluid 40, the size of the magnet 31x is increased. Further, even though the heat source 11 is on the lower side, the low-temperature magnetic fluid 40 gathers on the upper side due to the magnetic force, and the cooling efficiency is lowered.
　図６（Ｂ）では、図６（Ａ）の磁性流体駆動装置１０ｘと同様の構成に加えて、熱源１１よりも－Ｙ側に２つ目の磁石３１ｙが配置された磁性流体駆動装置１０ｙを例示している。この場合、１つ目の磁石３１ｘに対向する２つ目の磁石３１ｙによって、受熱器２１ｘに印加する磁界を強めることが期待される。 In FIG. 6B, in addition to the same configuration as the magnetic fluid driving device 10x of FIG. 6A, the magnetic fluid driving device 10y in which the second magnet 31y is arranged on the −Y side of the heat source 11 is provided. It is illustrated. In this case, it is expected that the second magnet 31y facing the first magnet 31x strengthens the magnetic field applied to the heat receiver 21x.
　しかしながら、２つ目の磁石３１ｙは熱源１１の分、受熱器２１ｘから遠いことから、当該磁石３１ｙの寄与は小さくなってしまう。また、磁性流体駆動装置１０ｙが組み込まれる電子機器の内部における熱源１１の周囲には通常、他の種々の構成部品が存在することから、図６（Ｂ）の構成では、２つの磁石３１ｘ，３１ｙを近接して対向させることは困難と想定される。 However, since the second magnet 31y is far from the heat receiver 21x by the amount of the heat source 11, the contribution of the magnet 31y becomes small. Further, since various other components are usually present around the heat source 11 inside the electronic device in which the magnetic fluid driving device 10y is incorporated, in the configuration of FIG. 6B, the two magnets 31x, 31y It is assumed that it is difficult to make them face each other in close proximity.
　これに対して、本実施形態の磁性流体駆動装置１０では、図２等に示すように、受熱器２１の短辺側に各磁石３１，３２を配置することにより、熱源１１等の配置に干渉することなく、２つの磁石３１，３２を対向させることができる。これにより、本実施形態の磁性流体駆動装置１０では、扁平した受熱器２１を用いて磁性流体４０を駆動可能な磁界が容易に得られ、磁性流体４０の駆動を効率良く実現することができる。 On the other hand, in the magnetic fluid drive device 10 of the present embodiment, as shown in FIG. 2 and the like, by arranging the magnets 31 and 32 on the short side side of the heat receiver 21, the magnets 31 and 32 interfere with the arrangement of the heat source 11 and the like. The two magnets 31 and 32 can be opposed to each other without doing so. As a result, in the magnetic fluid driving device 10 of the present embodiment, a magnetic field capable of driving the magnetic fluid 40 using the flat heat receiver 21 can be easily obtained, and the driving of the magnetic fluid 40 can be efficiently realized.
３．まとめ
　以上のように、本実施形態における磁性流体駆動装置１０は、感温性を有する磁性流体４０を、熱源１１等の外部からの受熱に応じて駆動する。磁性流体駆動装置１０は、受熱器２１と、磁性部材の一例の磁石３１，３２とを備える。受熱器２１は、磁性流体４０が流れる流路管４１、４２と接続される。熱を受熱する受熱器２１を構成する。磁性部材は、例えば２つの磁石３１，３２を含み、１対の対向面としての各主面３１ａ，３２ａの間に磁界を生じる。受熱器２１は、流路２０に磁性流体４０を流すＺ方向（流れ方向）と交差するＸ方向（幅方向）において、Ｚ方向及びＸ方向と交差するＹ方向（垂直方向）よりも大きいサイズを有する。磁性部材は、各磁石３１，３２の主面３１ａ，３２ａがＸ方向における受熱器２１の両側に位置して、受熱器２１を介して互いに対向するように配置される。 3. 3. Summary As described above, the magnetic fluid driving device 10 in the present embodiment drives the temperature-sensitive magnetic fluid 40 in response to heat reception from the outside such as the heat source 11. The magnetic fluid drive device 10 includes a heat receiver 21 and magnets 31 and 32, which are examples of magnetic members. The heat receiver 21 is connected to the flow path pipes 41 and 42 through which the magnetic fluid 40 flows. A heat receiver 21 that receives heat is configured. The magnetic member includes, for example, two magnets 31 and 32, and generates a magnetic field between the main surfaces 31a and 32a as a pair of facing surfaces. The heat receiver 21 has a size larger than the Z direction and the Y direction (vertical direction) that intersects the X direction in the X direction (width direction) that intersects the Z direction (flow direction) in which the magnetic fluid 40 flows through the flow path 20. Have. The magnetic members are arranged so that the main surfaces 31a and 32a of the magnets 31 and 32 are located on both sides of the heat receiver 21 in the X direction and face each other via the heat receiver 21.
　以上の磁性流体駆動装置１０によると、各磁石３１，３２の位置が、Ｘ方向すなわち受熱器２１の断面における幅方向において、受熱器２１の両側であることから、幅方向に沿って受熱器２１に熱源１１を隣接させる配置が容易に行える。磁性流体駆動装置１０は、熱源１１から効率良く受熱でき、熱源１１からの受熱に応じた磁性流体４０の駆動を効率良くすることができる。 According to the above magnetic fluid drive device 10, since the positions of the magnets 31 and 32 are on both sides of the heat receiver 21 in the X direction, that is, in the width direction in the cross section of the heat receiver 21, the heat receiver 21 is along the width direction. The heat source 11 can be easily arranged adjacent to the heat source 11. The magnetic fluid driving device 10 can efficiently receive heat from the heat source 11, and can efficiently drive the magnetic fluid 40 according to the heat received from the heat source 11.
　本実施形態の磁性流体駆動装置１０において、１対の対向面としての各磁石３１，３２の主面３１ａ，３２ａは、例えば互いに逆の極性を有する磁極を構成する。これにより、磁石間３１，３２間の磁界Ｈを強め合って、磁性流体４０を効率良く駆動することができる。 In the magnetic fluid driving device 10 of the present embodiment, the main surfaces 31a and 32a of the magnets 31 and 32 as a pair of facing surfaces form, for example, magnetic poles having opposite polarities. As a result, the magnetic fields H between the magnets 31 and 32 can be strengthened to efficiently drive the magnetic fluid 40.
　本実施形態において、磁性流体駆動装置１０の磁性部材は、１対の対向面を形成するように対向配置された２つの磁石３１，３２を含む。２つの磁石３１，３２を対向させる簡単な構成により、磁性流体４０の駆動を容易に実現することができる。 In the present embodiment, the magnetic member of the ferrofluid drive device 10 includes two magnets 31 and 32 arranged to face each other so as to form a pair of facing surfaces. The drive of the magnetic fluid 40 can be easily realized by a simple configuration in which the two magnets 31 and 32 face each other.
　本実施形態において、磁性流体駆動装置１０は、放熱器１２をさらに備える。放熱器１２は、流路管４１、４２に連結され、磁性流体４０を放熱する。熱源１１から受熱して流動した磁性流体４０を放熱器１２で放熱することにより、磁性流体４０による熱源１１の冷却を循環的に行うことができる。 In the present embodiment, the magnetic fluid drive device 10 further includes a radiator 12. The radiator 12 is connected to the flow path pipes 41 and 42 to dissipate heat from the magnetic fluid 40. By receiving heat from the heat source 11 and radiating the flowing magnetic fluid 40 with the radiator 12, the heat source 11 can be cooled by the magnetic fluid 40 in a cyclical manner.
　本実施形態に係る熱輸送システム１は、熱源１１と、磁性流体駆動装置１０とを備える。熱源１１は、例えば受熱器２１の－Ｙ側などＹ方向において隣接し、Ｘに沿って配置される。即ち、熱源１１は、受熱器２１外周の幅方向と流れ方向からなる面に隣接して配置される。磁性流体駆動装置１０は、熱源１１からの受熱に応じて磁性流体４０を駆動する。熱輸送システム１によると、磁性流体駆動装置１０によって熱源１１からの受熱に応じた磁性流体４０の駆動を効率良くして、熱源１１の冷却等の熱の輸送を行える。 The heat transport system 1 according to the present embodiment includes a heat source 11 and a magnetic fluid drive device 10. The heat source 11 is adjacent in the Y direction, for example, on the −Y side of the heat receiver 21, and is arranged along X. That is, the heat source 11 is arranged adjacent to a surface formed by the width direction and the flow direction of the outer circumference of the heat receiver 21. The magnetic fluid driving device 10 drives the magnetic fluid 40 in response to the heat received from the heat source 11. According to the heat transport system 1, the magnetic fluid drive device 10 efficiently drives the magnetic fluid 40 in response to the heat received from the heat source 11, and can transport heat such as cooling of the heat source 11.
（実施形態１の変形例）
　以上に説明した実施形態１の磁性流体駆動装置１０の変形例について、図７～図９を用いて説明する。 (Modified Example of Embodiment 1)
A modified example of the magnetic fluid driving device 10 of the first embodiment described above will be described with reference to FIGS. 7 to 9.
　図７は、実施形態１に係る磁性流体駆動装置１０の変形例１を示す。上記の実施形態１では、磁性流体駆動装置１０が、矩形状の受熱器２１を備える例を説明したが、磁性流体駆動装置１０は特にこれに限定されない。例えば、本変形例における磁性流体駆動装置１０は、図７に例示するように、楕円状や小判状の断面形状を有する受熱器２１Ａを備えてもよい。又、受熱器２１Ａの形状は、流路２０の流れ方向に適宜許容誤差の範囲内で直交する、即ち流れ方向に交差する幅方向、及び流れ方向及び幅方向に交差する垂直方向を有する種々の形状であってもよい。 FIG. 7 shows a modification 1 of the magnetic fluid driving device 10 according to the first embodiment. In the above-described first embodiment, the example in which the magnetic fluid driving device 10 includes the rectangular heat receiver 21 has been described, but the magnetic fluid driving device 10 is not particularly limited to this. For example, the magnetic fluid driving device 10 in this modification may include a heat receiver 21A having an elliptical or oval cross-sectional shape, as illustrated in FIG. Further, the shape of the heat receiver 21A has various shapes that are orthogonal to the flow direction of the flow path 20 within a tolerance, that is, have a width direction that intersects the flow direction and a vertical direction that intersects the flow direction and the width direction. It may be in shape.
　また、本変形例の磁性流体駆動装置１０において、受熱器２１と同様の形状を有する流路管４１、４２により、放熱器１２に連結してもよい（図１参照）。すなわち、受熱器２１Ａとパイプ部２２とは特に形状等で区別されなくてもよい。 Further, in the magnetic fluid drive device 10 of the present modification, the flow path tubes 41 and 42 having the same shape as the heat receiver 21 may be connected to the radiator 12 (see FIG. 1). That is, the heat receiver 21A and the pipe portion 22 do not have to be particularly distinguished by their shape or the like.
　図８は、実施形態１に係る磁性流体駆動装置１０の変形例２を示す。本変形例において、磁性流体駆動装置１０は、実施形態１と同様の構成において、Ｙ方向における受熱器２１のサイズよりも大きいサイズの磁石３１Ａ，３２Ａを備える。本変形例において、各磁石３１Ａ，３２Ａは、受熱器２１がＹ方向において中央近傍に位置するように、互いに対向配置されている。各磁石３１Ａ，３２Ａの対向する主面は、磁性部材の対向面の一例である。 FIG. 8 shows a modification 2 of the magnetic fluid driving device 10 according to the first embodiment. In this modification, the magnetic fluid drive device 10 includes magnets 31A and 32A having a size larger than the size of the heat receiver 21 in the Y direction in the same configuration as in the first embodiment. In this modification, the magnets 31A and 32A are arranged so as to face each other so that the heat receiver 21 is located near the center in the Y direction. The facing main surfaces of the magnets 31A and 32A are examples of facing surfaces of the magnetic member.
　以上のように、磁性流体駆動装置１０における磁性部材としての磁石３１Ａ，３２Ａの対向面は、Ｙ方向における受熱器２１のサイズよりも大きいサイズを有してもよい。これにより、受熱器２１の流路２０中で磁性流体４０に印加する磁界の均一性を向上し、強度の高い範囲を有効に利用することができる。 As described above, the facing surfaces of the magnets 31A and 32A as magnetic members in the magnetic fluid driving device 10 may have a size larger than the size of the heat receiver 21 in the Y direction. As a result, the uniformity of the magnetic field applied to the magnetic fluid 40 in the flow path 20 of the heat receiver 21 can be improved, and a high-strength range can be effectively used.
　図９は、実施形態１に係る磁性流体駆動装置１０の変形例３を示す。本変形例において、磁性流体駆動装置１０は、実施形態１と同様の構成に加えて、図９に例示するように、磁気ヨーク３３をさらに備える。本変形例において、磁気ヨーク３３はＵ字状に形成され、受熱器２１の＋Ｙ側を渡して２つの磁石３１，３２に連結される。 FIG. 9 shows a modification 3 of the magnetic fluid driving device 10 according to the first embodiment. In this modification, the magnetic fluid drive device 10 further includes a magnetic yoke 33 as illustrated in FIG. 9, in addition to the same configuration as in the first embodiment. In this modification, the magnetic yoke 33 is formed in a U shape and is connected to the two magnets 31 and 32 across the + Y side of the heat receiver 21.
　磁気ヨーク３３と各磁石３１，３２とは、物理的に直接、結合されてもよいし、磁気的に結合されてもよい。後者の場合、例えば、受熱器２１の±Ｘ側の側壁を介して、磁気ヨーク３３と各磁石３１，３２とを磁気的に結合させる連結により、各磁石３１，３２を受熱器２１の流路２０内に配置することも可能である。 The magnetic yoke 33 and the magnets 31 and 32 may be physically directly coupled or magnetically coupled. In the latter case, for example, the magnets 31 and 32 are connected to the flow path of the heat receiver 21 by magnetically coupling the magnetic yoke 33 and the magnets 31 and 32 via the side wall on the ± X side of the heat receiver 21. It is also possible to arrange it within 20.
　以上のように、磁性流体駆動装置１０における磁性部材は、磁石３１，３２に連結される磁気ヨーク３３をさらに含んでもよい。磁石３１，３２と磁気ヨーク３３とで構成される磁気回路により、受熱器２１に印加する磁界を強めることができる。 As described above, the magnetic member in the magnetic fluid driving device 10 may further include a magnetic yoke 33 connected to the magnets 31 and 32. The magnetic field applied to the heat receiver 21 can be strengthened by the magnetic circuit composed of the magnets 31 and 32 and the magnetic yoke 33.
（実施形態２）
　以下、図面を用いて、実施形態２を説明する。実施形態１では、２つの磁石３１，３２を用いる磁性流体駆動装置１０について説明した。実施形態２では、更なる磁石を用いて磁界の均一性を向上する磁性流体駆動装置について説明する。 (Embodiment 2)
Hereinafter, the second embodiment will be described with reference to the drawings. In the first embodiment, the magnetic fluid driving device 10 using two magnets 31 and 32 has been described. In the second embodiment, a magnetic fluid driving device for improving the uniformity of the magnetic field by using a further magnet will be described.
　以下、実施形態１の熱輸送システム１及び磁性流体駆動装置１０と同様の構成および動作の説明は適宜、省略して、本実施形態に係る磁性流体駆動装置を説明する。 Hereinafter, the magnetic fluid driving device according to the present embodiment will be described by omitting the description of the configuration and operation similar to the heat transport system 1 and the magnetic fluid driving device 10 of the first embodiment as appropriate.
　図１０は、実施形態２に係る磁性流体駆動装置１０Ａの構成例を示す斜視図である。本実施形態に係る磁性流体駆動装置１０Ａは、実施形態１と同様の構成（図２参照）に加えて、受熱器２１における流路２０の途中に配置される追加の磁石３０を備える。追加の磁石３０は、例えば他の磁石３１，３２と同様に構成される。同磁石３０の向き、及びＹ，Ｚ方向における位置も、例えば他の磁石３１，３２と同様である。 FIG. 10 is a perspective view showing a configuration example of the magnetic fluid drive device 10A according to the second embodiment. The magnetic fluid drive device 10A according to the present embodiment includes an additional magnet 30 arranged in the middle of the flow path 20 in the heat receiver 21 in addition to the same configuration as that of the first embodiment (see FIG. 2). The additional magnet 30 is configured in the same manner as the other magnets 31 and 32, for example. The orientation of the magnet 30 and the positions in the Y and Z directions are also the same as those of the other magnets 31 and 32, for example.
　図１１は、図１０の磁性流体駆動装置１０Ａの前面図を示す。例えば、追加の磁石３０は、Ｘ方向において流路２０の中心などの中間位置に配置される。追加の磁石３０は、本実施形態における磁性部材の中間部の一例である。同磁石３０の各主面は、それぞれ対向する磁石３１，３２の主面３１ａ，３２ａとは逆の極性の磁極を構成する。 FIG. 11 shows a front view of the magnetic fluid drive device 10A of FIG. For example, the additional magnet 30 is arranged at an intermediate position such as the center of the flow path 20 in the X direction. The additional magnet 30 is an example of an intermediate portion of the magnetic member in this embodiment. Each main surface of the magnet 30 constitutes a magnetic pole having a polarity opposite to that of the main surfaces 31a and 32a of the magnets 31 and 32 facing each other.
　本実施形態の磁性流体駆動装置１０Ａによると、Ｘ方向に並んだ３つの磁石３０～３２により、受熱器２１の流路２０中で、磁束密度の分布ムラを低減することができる。この点に関して本願発明者は数値計算によるシミュレーションを行った。磁性流体駆動装置１０Ａにおける磁束密度のシミュレーションについて、図１２を用いて説明する。 According to the magnetic fluid drive device 10A of the present embodiment, the distribution unevenness of the magnetic flux density can be reduced in the flow path 20 of the heat receiver 21 by the three magnets 30 to 32 arranged in the X direction. In this regard, the inventor of the present application performed a simulation by numerical calculation. The simulation of the magnetic flux density in the magnetic fluid driving device 10A will be described with reference to FIG.
　図１２（Ａ）は、本実施形態の磁性流体駆動装置１０Ａにおけるシミュレーション結果を示すグラフである。図１２（Ｂ）は、上述した第１の想定例の磁性流体駆動装置１０ｘにおけるシミュレーション結果を示す。 FIG. 12A is a graph showing a simulation result in the magnetic fluid driving device 10A of the present embodiment. FIG. 12B shows a simulation result in the magnetic fluid driving device 10x of the first assumed example described above.
　本シミュレーションでは、各磁性流体駆動装置１０Ａ，１０ｘの受熱器２１，２１ｘにおける磁束密度の分布を数値計算した。図１２（Ａ）は、図１０のＡ－Ａ断面における磁束密度の分布を示す。図１２（Ｂ）は、図６（Ａ）において、上記のＡ－Ａ断面と同様の断面における磁束密度の分布を示す。 In this simulation, the distribution of the magnetic flux density in the heat receivers 21 and 21x of each ferrofluid drive device 10A and 10x was numerically calculated. FIG. 12A shows the distribution of the magnetic flux density in the AA cross section of FIG. FIG. 12B shows the distribution of the magnetic flux density in the same cross section as the above AA cross section in FIG. 6A.
　図１２（Ａ）のシミュレーションでは、３つの磁石３０～３２の個々のサイズを、３０ｍｍ×１０ｍｍ×５ｍｍに設定した。図１２（Ｂ）のシミュレーションでは、使用する磁石の体積が図１２（Ａ）と同じになるように、磁石３１ｘのサイズを３０ｍｍ×３０ｍｍ×５ｍｍに設定した。 In the simulation of FIG. 12A, the individual sizes of the three magnets 30 to 32 were set to 30 mm × 10 mm × 5 mm. In the simulation of FIG. 12 (B), the size of the magnet 31x was set to 30 mm × 30 mm × 5 mm so that the volume of the magnet used was the same as that of FIG. 12 (A).
　以上のシミュレーションによると、本実施形態の磁性流体駆動装置１０Ａの構成により、図６の場合よりも約１．４６倍の磁束密度の大きさが得られることが確認された。又、本実施形態の構成によると、図１２（Ａ）に示すように、磁束密度の分布ムラが、図１２（Ｂ）よりも低減されている。これにより、本実施形態の磁性流体駆動装置１０Ａによると、受熱器２１における磁性流体４０の流量を増大可能にするなど、磁性流体４０を駆動する効率を向上することができることが確認された。 According to the above simulation, it was confirmed that the configuration of the magnetic fluid driving device 10A of the present embodiment can obtain a magnetic flux density of about 1.46 times that of the case of FIG. Further, according to the configuration of the present embodiment, as shown in FIG. 12A, the uneven distribution of the magnetic flux density is reduced as compared with FIG. 12B. As a result, according to the magnetic fluid driving device 10A of the present embodiment, it was confirmed that the efficiency of driving the magnetic fluid 40 can be improved, such as making it possible to increase the flow rate of the magnetic fluid 40 in the heat receiver 21.
　以上のように、本実施形態において、磁性流体駆動装置１０Ａにおける磁性部材は、１対の対向面である２つの磁石３１，３２の主面３１ａ，３２ａ間に位置し、追加の磁石３０で構成される中間部を備える。これにより、受熱器２１の流路２０中で磁界の均一性を向上し、磁性流体４０を駆動する効率を良くすることができる。 As described above, in the present embodiment, the magnetic member in the magnetic fluid driving device 10A is located between the main surfaces 31a and 32a of the two magnets 31 and 32 which are a pair of facing surfaces, and is composed of an additional magnet 30. It has an intermediate part to be magnetized. As a result, the uniformity of the magnetic field in the flow path 20 of the heat receiver 21 can be improved, and the efficiency of driving the magnetic fluid 40 can be improved.
（実施形態２の変形例）
　図１３は、実施形態２に係る磁性流体駆動装置１０Ａの変形例を示す斜視図である。磁性流体駆動装置１０Ａにおいて、上記の磁石３０は、受熱器２１の流路２０から隔離されてもよい。 (Modified Example of Embodiment 2)
FIG. 13 is a perspective view showing a modified example of the magnetic fluid driving device 10A according to the second embodiment. In the ferrofluid drive device 10A, the magnet 30 may be isolated from the flow path 20 of the heat receiver 21.
　図１４は、図１３の磁性流体駆動装置１０Ａの前面図を示す。本変形例において、磁性流体駆動装置１０Ａには、上記の磁石３０を流路２０から隔離するための、中空の壁部２３が設けられる。壁部２３は、例えば受熱器２１中で、Ｘ方向における中間位置においてＺ方向に延在する間隙を囲むように設けられ、磁性流体駆動装置１０Ａの一部を構成する。本変形例において、上記の磁石３０は、壁部２３による間隙に挿入することにより、中間位置に配置できる。 FIG. 14 shows a front view of the magnetic fluid drive device 10A of FIG. In this modification, the magnetic fluid drive device 10A is provided with a hollow wall portion 23 for isolating the magnet 30 from the flow path 20. The wall portion 23 is provided, for example, in the heat receiver 21 so as to surround a gap extending in the Z direction at an intermediate position in the X direction, and constitutes a part of the magnetic fluid driving device 10A. In this modification, the magnet 30 can be arranged at an intermediate position by inserting it into the gap formed by the wall portion 23.
　以上のように、磁性流体駆動装置１０Ａにおいて、受熱器２１は、流路２０から中間部の磁石３０を隔離するように設けられた壁部２３を備えてもよい。これにより、中間部の磁石３０が磁性流体４０に直接、接触しないようにすることができる。 As described above, in the magnetic fluid drive device 10A, the heat receiver 21 may include a wall portion 23 provided so as to isolate the magnet 30 in the intermediate portion from the flow path 20. As a result, the magnet 30 in the intermediate portion can be prevented from coming into direct contact with the magnetic fluid 40.
（実施形態３）
　以下、図面を用いて、実施形態３を説明する。実施形態２では、中間部として追加の磁石３０を用いる磁性流体駆動装置１０Ａについて説明した。実施形態３では、追加の磁石３０の代わりに磁気ヨークを用いて磁界の均一性を向上する磁性流体駆動装置について説明する。 (Embodiment 3)
Hereinafter, the third embodiment will be described with reference to the drawings. In the second embodiment, the magnetic fluid driving device 10A using an additional magnet 30 as an intermediate portion has been described. In the third embodiment, a magnetic fluid driving device for improving the uniformity of the magnetic field by using a magnetic yoke instead of the additional magnet 30 will be described.
　以下、実施形態１，２と同様の構成および動作の説明は適宜、省略して、本実施形態に係る磁性流体駆動装置を説明する。 Hereinafter, the magnetic fluid drive device according to the present embodiment will be described by omitting the description of the configuration and operation similar to those of the first and second embodiments as appropriate.
　図１５は、実施形態３に係る磁性流体駆動装置１０Ｂの構成例を示す。本実施形態の磁性流体駆動装置１０は、例えば実施形態２の変形例と同様の構成において（図１３参照）、追加の磁石３０の代わりに、磁性部材の中間部として突起部３５ａを有する磁気ヨーク３５を備える。 FIG. 15 shows a configuration example of the magnetic fluid drive device 10B according to the third embodiment. The magnetic fluid drive device 10 of the present embodiment has, for example, a magnetic yoke having a protrusion 35a as an intermediate portion of the magnetic member instead of the additional magnet 30 in the same configuration as the modification of the second embodiment (see FIG. 13). 35 is provided.
　図１６は、本実施形態における磁性流体駆動装置１０Ｂの磁性部材を例示する。本実施形態の磁気ヨーク３５は、例えばＥ字状の断面形状を有し、中央の突起部３５ａによって中間部を構成する。磁気ヨーク３５は両端において、対向面を形成する２つの磁石３１，３２に連結される。磁気ヨーク３５の突起部３５ａは、受熱器２１における壁部２３の間隙に挿入される。磁気ヨーク３５及び突起部３５ａは、磁石３１，３２によって磁化され、受熱器２１において磁界を適切に誘導できる。 FIG. 16 illustrates the magnetic member of the magnetic fluid drive device 10B in this embodiment. The magnetic yoke 35 of the present embodiment has, for example, an E-shaped cross-sectional shape, and an intermediate portion is formed by a central protrusion 35a. The magnetic yoke 35 is connected to two magnets 31 and 32 forming facing surfaces at both ends. The protrusion 35a of the magnetic yoke 35 is inserted into the gap of the wall portion 23 of the heat receiver 21. The magnetic yoke 35 and the protrusion 35a are magnetized by the magnets 31 and 32, and the magnetic field can be appropriately induced in the heat receiver 21.
　以上のように、本実施形態において、磁性流体駆動装置１０Ｂにおける磁性部材は、１対の対向面である２つの磁石３１，３２の主面３１ａ，３２ａ間に位置し、磁気ヨーク３５の突起部３５ａで構成される中間部を備える。これによっても、実施形態２と同様に、磁性流体４０を駆動する効率を良くすることができる。また、流路２０から中間部を隔離するように設けられた壁部２３を用いて、中間部としての突起部３５ａが磁性流体４０に接しないように構成できる。 As described above, in the present embodiment, the magnetic member in the magnetic fluid driving device 10B is located between the main surfaces 31a and 32a of the two magnets 31 and 32 which are a pair of facing surfaces, and the protrusion of the magnetic yoke 35. It includes an intermediate portion composed of 35a. This also makes it possible to improve the efficiency of driving the magnetic fluid 40, as in the second embodiment. Further, the wall portion 23 provided so as to isolate the intermediate portion from the flow path 20 can be used so that the protruding portion 35a as the intermediate portion does not come into contact with the magnetic fluid 40.
（実施形態３の変形例）
　図１７は、実施形態３に係る磁性流体駆動装置１０Ｂの変形例を示す。本変形例の磁性流体駆動装置１０Ｂは、実施形態３と同様の構成において（図１５参照）、図１６の磁性部材の代わりに、磁石３１Ｂ，３２Ｂを組み込んでＥ字状に構成された磁性部材を備える。 (Modified Example of Embodiment 3)
FIG. 17 shows a modified example of the magnetic fluid driving device 10B according to the third embodiment. The magnetic fluid drive device 10B of the present modification has the same configuration as that of the third embodiment (see FIG. 15), and is formed in an E shape by incorporating magnets 31B and 32B instead of the magnetic member of FIG. To be equipped.
　図１８は、本変形例の磁性部材を例示する。本変形例において、２つの磁石３１Ｂ，３２Ｂは、３つの磁気ヨーク３６ａ，３６ｂ，３６ｃの間に結合されている。２つの磁石３１Ｂ，３２Ｂは、受熱器２１の長辺側であって熱源１１とは反対側（＋Ｙ側）に位置する。 FIG. 18 illustrates a magnetic member of this modified example. In this modification, the two magnets 31B and 32B are coupled between the three magnetic yokes 36a, 36b and 36c. The two magnets 31B and 32B are located on the long side of the heat receiver 21 and on the opposite side (+ Y side) of the heat source 11.
　２つの磁気ヨーク３６ａ，３６ｃは、例えばＬ字状あるいはＩ字状であり、受熱器２１の短辺側の両端に位置する。本変形例において、各磁気ヨーク３６ａ，３６ｃは、別々の磁石３１，３２に連結される。２つの磁気ヨーク３６ａ，３６ｃは、１対の対向面を構成する。残りの磁気ヨーク３６ｂは、例えばＴ字状あるいはＩ字状であり、２つの磁石３１Ｂ，３２Ｂ間に結合される。磁気ヨーク３６ｂは、壁部２３の間隙に挿入され、中間部を構成する。 The two magnetic yokes 36a and 36c are, for example, L-shaped or I-shaped, and are located at both ends on the short side of the heat receiver 21. In this modification, the magnetic yokes 36a and 36c are connected to separate magnets 31 and 32. The two magnetic yokes 36a and 36c form a pair of facing surfaces. The remaining magnetic yoke 36b is, for example, T-shaped or I-shaped and is coupled between the two magnets 31B and 32B. The magnetic yoke 36b is inserted into the gap of the wall portion 23 to form an intermediate portion.
　以上のような磁性部材を備える磁性流体駆動装置１０Ｂによっても、２つの磁石３１Ｂ，３１Ｂを用いて上記の実施形態２，３と同様の効果を得ることができる。 Even with the magnetic fluid driving device 10B provided with the magnetic member as described above, the same effect as that of the above embodiments 2 and 3 can be obtained by using the two magnets 31B and 31B.
（実施形態４）
　以下、図面を用いて、実施形態４を説明する。実施形態４では、ハルバッハ配列を用いてより強い磁界を得られる磁性流体駆動装置について説明する。 (Embodiment 4)
Hereinafter, the fourth embodiment will be described with reference to the drawings. In the fourth embodiment, a magnetic fluid driving device capable of obtaining a stronger magnetic field by using a Halbach array will be described.
　以下、実施形態１～３と同様の構成および動作の説明は適宜、省略して、本実施形態に係る磁性流体駆動装置を説明する。 Hereinafter, the magnetic fluid driving device according to the present embodiment will be described by omitting the description of the configuration and operation similar to those of the first to third embodiments as appropriate.
　図１９は、実施形態４に係る磁性流体駆動装置１０Ｃの構成例を示す。本実施形態の磁性流体駆動装置１０Ｃは、例えば実施形態２の変形例と同様の構成において（図１４参照）、受熱器２１の両端においてハルバッハ配列による磁石３１Ｃ，３２Ｃを備える。 FIG. 19 shows a configuration example of the magnetic fluid drive device 10C according to the fourth embodiment. The magnetic fluid drive device 10C of the present embodiment includes magnets 31C and 32C in a Halbach array at both ends of the heat receiver 21 in the same configuration as the modification of the second embodiment (see FIG. 14).
　図２０は、本実施形態における磁性流体駆動装置１０Ｃの磁性部材を例示する。図２０では、図１９と同様に配置された各磁石３１Ｃ，３２Ｃ，３０の磁極を例示している。図２０に示すように、受熱器２１の流路２０中で対向する磁石３１Ｃ，３２Ｃ間で、磁界を強め合うようなハルバッハ配列を採用することにより、流路２０中で磁性流体４０により強い磁界を印加できる。 FIG. 20 illustrates the magnetic member of the magnetic fluid drive device 10C in this embodiment. FIG. 20 illustrates the magnetic poles of the magnets 31C, 32C, and 30 arranged in the same manner as in FIG. As shown in FIG. 20, by adopting a Halbach array that strengthens the magnetic fields between the magnets 31C and 32C facing each other in the flow path 20 of the heat receiver 21, the magnetic field stronger than the magnetic fluid 40 in the flow path 20 Can be applied.
　なお、以上の説明では、磁石３１Ｃ，３２Ｃ間に中間部の磁石３０が配置される例を説明したが、中間部の磁石３０は配置されなくてもよい。この場合も、磁石３１Ｃ，３２Ｃに、各々の対向面間で磁界を強め合うハルバッハ配列を採用することができる。 In the above description, an example in which the magnet 30 in the intermediate portion is arranged between the magnets 31C and 32C has been described, but the magnet 30 in the intermediate portion may not be arranged. In this case as well, the Halbach array that strengthens the magnetic fields between the facing surfaces can be adopted for the magnets 31C and 32C.
　以上のように、本実施形態において、磁性流体駆動装置１０Ｃの磁性部材は、１対の対向面の間で磁界を強め合うようにハルバッハ配列された複数の磁石３１Ｃ，３２Ｃを含む。これにより、受熱器２１の流路２０中の磁界を強くして、磁性流体４０の流量増大などを図ることができる。 As described above, in the present embodiment, the magnetic member of the magnetic fluid drive device 10C includes a plurality of magnets 31C and 32C arranged in a Halbach array so as to strengthen the magnetic fields between the pair of facing surfaces. As a result, the magnetic field in the flow path 20 of the heat receiver 21 can be strengthened to increase the flow rate of the magnetic fluid 40.
（他の実施形態）
　以上のように、本出願において開示する技術の例示として、実施形態１～４を説明した。しかしながら、本開示における技術は、これに限定されず、適宜、変更、置換、付加、省略などを行った実施の形態にも適用可能である。また、上記各実施形態で説明した各構成要素を組み合わせて、新たな実施の形態とすることも可能である。そこで、以下、他の実施形態を例示する。 (Other embodiments)
As described above, Embodiments 1 to 4 have been described as examples of the techniques disclosed in this application. However, the technique in the present disclosure is not limited to this, and can be applied to embodiments in which changes, substitutions, additions, omissions, etc. are appropriately made. It is also possible to combine the components described in each of the above embodiments into a new embodiment. Therefore, other embodiments will be illustrated below.
　上記の実施形態１では、２つの磁石３１，３２を用いる磁性流体駆動装置１０について説明した。本実施形態の磁性流体駆動装置は、１つの磁石用いて構成されてもよい。この変形例について、図２１を用いて説明する。 In the first embodiment described above, the magnetic fluid driving device 10 using the two magnets 31 and 32 has been described. The magnetic fluid drive device of the present embodiment may be configured by using one magnet. This modification will be described with reference to FIG.
　図２１は、変形例１に係る磁性流体駆動装置１０Ｄを示す。本変形例の磁性流体駆動装置１０Ｄは、例えば実施形態１と同様の構成において、図２の磁性部材の代わりに、１つの磁石３１Ｄと磁気ヨーク３７ａ，３７ｂとで構成された磁性部材を備える。本変形例の磁性部材では、例えば図１８の磁性部材と同様に、２つの磁気ヨーク３７ａ，３７ｂが１対の対向面を形成する。本例において、各磁気ヨーク３７ａ，３７ｂは、同じ磁石３１Ｄに連結されている。このような磁性流体駆動装置１０によっても、熱源１１からの受熱に応じた磁性流体４０の駆動を効率良くすることができる。 FIG. 21 shows the magnetic fluid drive device 10D according to the first modification. The magnetic fluid drive device 10D of the present modification includes, for example, in the same configuration as that of the first embodiment, instead of the magnetic member of FIG. 2, a magnetic member composed of one magnet 31D and magnetic yokes 37a and 37b. In the magnetic member of this modification, for example, the two magnetic yokes 37a and 37b form a pair of facing surfaces as in the magnetic member of FIG. In this example, the magnetic yokes 37a and 37b are connected to the same magnet 31D. Even with such a magnetic fluid driving device 10, it is possible to efficiently drive the magnetic fluid 40 according to the heat received from the heat source 11.
　上記の各実施形態では、磁性流体駆動装置１０、１０Ａ～Ｄにおける受熱器２１，２１Ａの形状を例示した。更なる変形例について、図２２を用いて説明する。 In each of the above embodiments, the shapes of the heat receivers 21 and 21A in the magnetic fluid drive devices 10, 10A to D are illustrated. A further modification will be described with reference to FIG.
　図２２は、変形例２に係る磁性流体駆動装置１０Ｅを示す。本変形例において、磁性流体駆動装置１０Ｅは、流路２０が複数の分岐流路２０ａ～２０ｃに分岐した受熱器２１Ｂを備える。複数の分岐流路２０ａ～２０ｃがＸ方向に並置されることにより、受熱器２１ＢはＹ方向（即ち垂直方向）よりもＸ方向（即ち幅方向）において大きいサイズを有する。分岐流路２０ａ～２０ｃの間の間隙には、中間部として磁石３０等を設置できる。各分岐流路２０ａ～２０ｃの流路壁２０ｗは、それぞれ中間部を隔離する壁部の一例である。 FIG. 22 shows the magnetic fluid drive device 10E according to the second modification. In this modification, the magnetic fluid drive device 10E includes a heat receiver 21B in which the flow path 20 is branched into a plurality of branch flow paths 20a to 20c. By juxtaposing the plurality of branch flow paths 20a to 20c in the X direction, the heat receiver 21B has a larger size in the X direction (that is, the width direction) than in the Y direction (that is, the vertical direction). A magnet 30 or the like can be installed as an intermediate portion in the gap between the branch flow paths 20a to 20c. The flow path walls 20w of the branch flow paths 20a to 20c are examples of wall portions that isolate the intermediate portions.
　また、本例では、受熱器２１Ｂにおいて各分岐流路２０ａ～２０ｃがパイプ状に形成されている。熱源１１と受熱器２１Ｂ間に、高熱伝導部材によるパイプ受け２４を設けることにより、熱源１１から受熱器２１Ｂへの受熱を効率良くすることができる。このような高熱伝導部材は、さらに、各分岐流路２０ａ～２０ｃの＋Ｙ側に追加されてもよい。 Further, in this example, each branch flow path 20a to 20c is formed in a pipe shape in the heat receiver 21B. By providing the pipe receiver 24 made of a high heat conductive member between the heat source 11 and the heat receiver 21B, it is possible to efficiently receive heat from the heat source 11 to the heat receiver 21B. Such a high heat conductive member may be further added to the + Y side of each branch flow path 20a to 20c.
　また、上記の各実施形態では、磁性流体駆動装置１０の磁性部材に含まれる磁石として、永久磁石を例示した。本実施形態において、磁性流体駆動装置１０の磁性部材における磁石は、必ずしも永久磁石でなくてもよく、例えば電磁石であってもよい。例えば、２つの平板コイルを対向させることにより、１対の対向面が形成されてもよい。 Further, in each of the above embodiments, a permanent magnet is exemplified as a magnet included in the magnetic member of the magnetic fluid drive device 10. In the present embodiment, the magnet in the magnetic member of the magnetic fluid drive device 10 does not necessarily have to be a permanent magnet, and may be, for example, an electromagnet. For example, a pair of facing surfaces may be formed by facing the two flat plate coils.
　また、上記の各実施形態では、熱源１１が面熱源である例を説明したが、本実施形態の熱輸送システム１は特にこれに限定されない。熱輸送システム１は面熱源でない熱源を冷却する際に磁性流体駆動装置１０を用いてもよい。 Further, in each of the above embodiments, an example in which the heat source 11 is a surface heat source has been described, but the heat transport system 1 of the present embodiment is not particularly limited to this. The heat transport system 1 may use the magnetic fluid drive device 10 when cooling a heat source that is not a surface heat source.
　また、上記の各実施形態では、熱輸送システム１において磁性流体駆動装置１０が熱源１１の冷却機構を構成する例を説明したが、熱輸送システム１及び磁性流体駆動装置１０の用途は特に冷却機構に限らない。熱輸送システム１は、各種の熱を輸送する用途において、磁性流体駆動装置１０を用いることができる。例えば、磁性流体装置１０は、リチウムイオン電池などを、環境温度が低い場合に加熱する用途に適用されてもよい。この場合、加熱対象の電池は、上述した熱輸送システム１における放熱器１２と同様の位置に配置される。 Further, in each of the above embodiments, an example in which the magnetic fluid drive device 10 constitutes the cooling mechanism of the heat source 11 in the heat transport system 1 has been described, but the heat transport system 1 and the magnetic fluid drive device 10 are particularly used for the cooling mechanism. Not limited to. In the heat transport system 1, the magnetic fluid drive device 10 can be used in various heat transport applications. For example, the magnetic fluid device 10 may be applied to an application for heating a lithium ion battery or the like when the ambient temperature is low. In this case, the battery to be heated is arranged at the same position as the radiator 12 in the heat transport system 1 described above.
　本開示は、例えば各種の電子機器において構成部品を冷却する用途に適用可能であり、例えば、プロジェクタのような光出力により発熱する機器に適用可能である。また、ヘッドライトやリチウムイオン電池といった車載機器あるいはＰＣ及びスマートフォンといった情報機器など、種々の分野に適用可能である。 The present disclosure is applicable to, for example, applications for cooling components in various electronic devices, and is applicable to devices that generate heat due to light output, such as projectors. Further, it can be applied to various fields such as in-vehicle devices such as headlights and lithium ion batteries, and information devices such as PCs and smartphones.

Claims (10)

  1. 　感温性を有する磁性流体を、受熱に応じて駆動する磁性流体駆動装置であって、
    　前記磁性流体が流れる流路を有し、熱を受熱する受熱器と、
    　少なくとも１つの磁石を含み、１対の対向面の間に磁界を生じる磁性部材とを備え、
    　前記受熱器は、前記流路に前記磁性流体を流す流れ方向と交差する幅方向において、前記流れ方向及び前記幅方向と交差する垂直方向よりも大きいサイズを有し、
    　前記磁性部材は、前記１対の対向面が前記幅方向における前記受熱器の両側に位置して、前記受熱器を介して互いに対向するように配置される
    磁性流体駆動装置。     A magnetic fluid driving device that drives a temperature-sensitive magnetic fluid in response to heat reception.
    A heat receiver that has a flow path through which the magnetic fluid flows and receives heat,
    A magnetic member comprising at least one magnet and generating a magnetic field between a pair of facing surfaces.
    The heat receiver has a size larger than the flow direction and the vertical direction intersecting the width direction in the width direction intersecting the flow direction in which the magnetic fluid flows in the flow path.
    The magnetic member is a magnetic fluid driving device in which the pair of facing surfaces are located on both sides of the heat receiver in the width direction and are arranged so as to face each other via the heat receiver.
  2. 　前記１対の対向面は、互いに逆の極性を有する磁極を構成する
    請求項１に記載の磁性流体駆動装置。     The magnetic fluid driving device according to claim 1, wherein the pair of facing surfaces form magnetic poles having opposite polarities.
  3. 　前記磁性部材は、前記１対の対向面を形成するように対向配置された２つの磁石を含む
    請求項１又は２に記載の磁性流体駆動装置。     The magnetic fluid driving device according to claim 1 or 2, wherein the magnetic member includes two magnets arranged so as to form the pair of facing surfaces.
  4. 　前記対向面は、前記垂直方向における前記受熱器のサイズよりも大きいサイズを有する
    請求項１～３のいずれか１項に記載の磁性流体駆動装置。     The magnetic fluid driving device according to any one of claims 1 to 3, wherein the facing surface has a size larger than the size of the heat receiver in the vertical direction.
  5. 　前記磁性部材は、前記磁石に連結される磁気ヨークをさらに含む
    請求項１～４のいずれか１項に記載の磁性流体駆動装置。     The magnetic fluid driving device according to any one of claims 1 to 4, wherein the magnetic member further includes a magnetic yoke connected to the magnet.
  6. 　前記磁性部材は、前記１対の対向面の間に位置し、磁石と磁気ヨークとの少なくとも一方で構成される中間部を備える
    請求項１～４のいずれか１項に記載の磁性流体駆動装置。     The magnetic fluid driving device according to any one of claims 1 to 4, wherein the magnetic member is located between the pair of facing surfaces and includes an intermediate portion formed by at least one of a magnet and a magnetic yoke. ..
  7. 　前記受熱器は、前記流路から前記中間部を隔離するように設けられた壁部を備える
    請求項６に記載の磁性流体駆動装置。     The magnetic fluid drive device according to claim 6, wherein the heat receiver includes a wall portion provided so as to isolate the intermediate portion from the flow path.
  8. 　前記磁性部材は、前記１対の対向面の間で磁界を強め合うようにハルバッハ配列された複数の磁石を含む
    請求項１～７のいずれか１項に記載の磁性流体駆動装置。     The magnetic fluid driving device according to any one of claims 1 to 7, wherein the magnetic member includes a plurality of magnets arranged in a Halbach array so as to strengthen magnetic fields between the pair of facing surfaces.
  9. 　前記受熱器と連結され、前記磁性流体を放熱する放熱器をさらに備える
    請求項１～８のいずれか１項に記載の磁性流体駆動装置。     The magnetic fluid driving device according to any one of claims 1 to 8, further comprising a radiator connected to the heat receiver and radiating heat from the magnetic fluid.
  10. 　前記受熱器外周の幅方向と流れ方向からなる面に隣接して配置される熱源と、
    　前記熱源からの熱に応じて前記磁性流体を駆動する、請求項１～９のいずれか１項に記載の磁性流体駆動装置とを備える
    熱輸送システム。     A heat source arranged adjacent to a surface formed by the width direction and the flow direction of the outer circumference of the heat receiver,
    A heat transport system including the magnetic fluid driving device according to any one of claims 1 to 9, which drives the magnetic fluid in response to heat from the heat source.
PCT/JP2020/001747 2019-04-12 2020-01-20 Magnetic fluid drive device and heat transport system WO2020208888A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-076380 2019-04-12
JP2019076380A JP2022088691A (en) 2019-04-12 2019-04-12 Magnetic fluid drive device and heat transport system

Publications (1)

Publication Number Publication Date
WO2020208888A1 true WO2020208888A1 (en) 2020-10-15

Family

ID=72751615

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/001747 WO2020208888A1 (en) 2019-04-12 2020-01-20 Magnetic fluid drive device and heat transport system

Country Status (2)

Country Link
JP (1) JP2022088691A (en)
WO (1) WO2020208888A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2608989A (en) * 2021-07-06 2023-01-25 Imra Europe S A S Variable cooling system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0950913A (en) * 1995-08-07 1997-02-18 Sumitomo Special Metals Co Ltd Magnetic field generating device for controlling magnetic fluid
WO2006059622A1 (en) * 2004-12-03 2006-06-08 Da Vinci Co., Ltd. Magnetic convection heat circulation pump
JP2006230092A (en) * 2005-02-17 2006-08-31 Sony Computer Entertainment Inc Power supply system, power supply device, and driving method for electronic circuit
JP2016052190A (en) * 2014-08-29 2016-04-11 株式会社Kri Magnetic fluid power generation device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0950913A (en) * 1995-08-07 1997-02-18 Sumitomo Special Metals Co Ltd Magnetic field generating device for controlling magnetic fluid
WO2006059622A1 (en) * 2004-12-03 2006-06-08 Da Vinci Co., Ltd. Magnetic convection heat circulation pump
JP2006230092A (en) * 2005-02-17 2006-08-31 Sony Computer Entertainment Inc Power supply system, power supply device, and driving method for electronic circuit
JP2016052190A (en) * 2014-08-29 2016-04-11 株式会社Kri Magnetic fluid power generation device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2608989A (en) * 2021-07-06 2023-01-25 Imra Europe S A S Variable cooling system
GB2608989B (en) * 2021-07-06 2023-08-23 Imra Europe S A S Variable cooling system

Also Published As

Publication number Publication date
JP2022088691A (en) 2022-06-15

Similar Documents

Publication Publication Date Title
EP1832828B1 (en) Magnetic convection heat circulation pump
US6946941B2 (en) Permanent magnet assembly
US7148777B2 (en) Permanent magnet assembly
JP6260621B2 (en) Magnetic field generator for magnetocaloric effect type thermal apparatus, and magnetocaloric effect type thermal apparatus equipped with such a generator
WO2020208888A1 (en) Magnetic fluid drive device and heat transport system
US11450465B2 (en) Magnetic field application device
JP6183662B2 (en) Magnetic field generator for heat appliances by magnetocaloric quantity
JP2014146692A (en) Thermoelectric power generation unit
JP2001327152A (en) Linear motor
KR100521075B1 (en) magnetization water treatment apparatus
BRPI0709911A2 (en) magnetic coupler with hysteresis, notably for winder-unwind devices
KR100623535B1 (en) Actuator coil cooling system
CN102748255A (en) Multi-cylinder thermomagnetic thermoacoustic power generation system
WO2021235058A1 (en) Magnetic fluid drive device and heat transport system
JP2019070455A (en) Magnetic fluid heat engine
JP7362454B2 (en) equipment, heat transport equipment, and electronic equipment
CN115516258B (en) Magnetic refrigerator
JP7475847B2 (en) Heat transport device and electronic device
JP2006128234A (en) Magnetic device
JP7012404B1 (en) Cooling device for electronic components
JP2584013B2 (en) Heat transfer device
US20050117218A1 (en) Switchable latching-type faraday rotator
JPS63244546A (en) Malti-pole lens employing permanent magnet
TWM607105U (en) Array electromagnet structure
JP2006243039A (en) Magneto-optic optical component

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20788353

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20788353

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP