Heat transfer device

Abstract

To provide a transport device that is not overly complex in its configuration and is suitable for the application of heat dissipation. [Solution] The heat transport device of the present invention comprises a pair of sheet-like members arranged with a gap between them in the front and back directions, a partition wall extending cylindrically from one of the sheet-like members to the other, thereby partitioning the containment space sandwiched between the sheet-like members, a temperature-sensitive magnetic fluid filled in the containment space, and a magnetic field generating unit that generates a magnetic field in the containment space with a magnetic field distribution in which the magnetic field strength is maximum at a predetermined reference position along the front and back surfaces of the sheet-like members, and the magnetic field strength decreases as it moves away from the reference position along the front and back surfaces.

Description

Technical Field

[0001] The present invention relates to a heat transport device for transporting heat from a heat source.

Background Art

[0002] Conventionally, a heat transport device for transporting heat has been known. For example, a thermosensitive magnetic fluid is filled in a flow path connecting a heat source and a radiator, and a magnetic field is applied over a heating region where the heat source contacts the flow path and an adjacent region adjacent to this heating region in the flow path direction (see Patent Document 1).

[0003] In this heat transport device, when the magnetic fluid in the heating region is heated by the heat source, the magnetic body force F2 acting on the magnetic fluid in the adjacent region becomes dominant (F1 < F2) over the magnetic body force F1 acting on this magnetic fluid, so that a flow of magnetic fluid from the adjacent region toward the heating region occurs. Thus, the heated magnetic fluid flows from the heat source side to the radiator side, and heat can be transported together with this magnetic fluid.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the heat transport devices described above have the drawback of often having complex configurations, making them not necessarily suitable for heat dissipation applications. For example, the heat transport devices described above require two separate channels to move the magnetic fluid between the heat source and the heat sink: one from the heat source to the heat sink, and another from heat sink to heat sink. Simplifying the device configuration, including the connections between these parts, is difficult. Furthermore, due to the structure in which a portion of the channel (the heated area) is heated by the heat source, it is necessary to use a heat source of a size that can contact this area, making it unsuitable for applications involving heat dissipation from a wide area.

[0006] This invention was made to solve these problems, and its objective is to provide a transport device that is not easily complicated in its configuration and is suitable for the application of heat dissipation. [Means for solving the problem]

[0007] To solve the above problems, the first phase heat transport device comprises a pair of sheet-like members arranged with a gap between them in the front and back directions, a partition wall extending cylindrically from one of the sheet-like members to the other, thereby partitioning the containment space sandwiched between the sheet-like members, a temperature-sensitive magnetic fluid filled in the containment space, and a magnetic field generating unit that generates a magnetic field with a magnetic field distribution in which the magnetic field strength is maximum at a predetermined reference position along the front and back surfaces of the sheet-like members, and the magnetic field strength decreases as it moves away from the reference position along the front and back surfaces.

[0008] In this type of heat transport device, a temperature-sensitive magnetic fluid is filled into a containment space sandwiched between sheet-like members, and a magnetic field is applied with a magnetic field distribution in which the magnetic field strength decreases as the distance from a predetermined reference position in this containment space increases.

[0009] Here, when the vicinity of the reference position in the accommodation space is heated by a heat source from one sheet-like member side, the magnetic body force F2 acting on the magnetic fluid farther from the reference position becomes dominant (F1 < F2) over the magnetic body force F1 acting on the magnetic fluid near the reference position, causing convection of the magnetic fluid in the accommodation space. This is because the magnetic fluid away from the reference position tends to flow toward the reference position, while the magnetic fluid near the reference position is pushed away by the magnetic fluid away from the reference position and tends to move away from the reference position.

[0010] At this time, in the process of the magnetic fluid near the reference position being pushed away by the magnetic fluid away from the reference position and moving away from the reference position, as a result of heat dissipation through the sheet-like member on the side not in contact with the heat source or an insufficiently heated area, it returns to the original temperature (i.e., the ambient temperature). On the contrary, the magnetic fluid away from the reference position is heated through the sheet-like member on one side in contact with the heat source in the process of flowing toward the reference position. Through such a cycle, heat from the heat source can be radiated to the outside.

[0011] And, in the above heat transport device, due to the characteristic of transporting heat by convection of the magnetic fluid in the accommodation space, there is no need to provide a complex flow path, and the device configuration can be made simple. Also, since heat can be transported using the entire surface of the sheet-like member, heat can be transported from a wide range according to the size of the sheet-like member, making it suitable for applications such as heat dissipation.

[0012] Also, the above aspect may be as follows in the second aspect shown below. In the second aspect, the magnetic field generation unit is a plurality of magnet bodies arranged at intervals along the front and back surfaces of the sheet-like member, and as the magnetic field distribution by the entire magnet bodies, the magnetic field intensity is maximum at the reference position, and each of the magnet bodies is arranged in a positional relationship such that the magnetic field intensity decreases as it moves away from the reference position.

[0013] In this type of heat transport device, multiple magnets can be used to generate a magnetic field with a desired magnetic field distribution.

[0014] Furthermore, each of the above phases may be as shown in the third phase below. In the third phase, the magnetic field generating unit is configured such that the magnetic field distribution by the entire magnetic body does not result in a bowl-shaped region of low magnetic field strength.

[0015] With this type of heat transport device, the magnetic field distribution does not form a bowl-shaped region of low magnetic field strength. Therefore, it is possible to effectively prevent the accumulation of magnetic fluid in such regions, which would reduce heat dissipation efficiency.

[0016] In order to prevent the formation of a region with a low magnetic field strength in a bowl shape due to the arrangement of each magnet, the above-mentioned surface should be made as shown in the fourth surface below. In the fourth surface, the magnetic field generating section has magnets having the same magnetic properties arranged at the same intervals at the reference position, at two locations on either side of the reference position in a predetermined first direction along the front-back direction of the sheet-like member, and at two locations on either side of the reference position in a second direction intersecting the first direction.

[0017] With this type of heat transport device, it is possible to prevent the formation of bowl-shaped regions with low magnetic field strength due to each individual magnet. [Brief explanation of the drawing]

[0018] [Figure 1] A plan view (a) and a front cross-sectional view (viewed by arrow AA) (b) of a heat transport apparatus according to an embodiment of the present disclosure. [Figure 2] Graph showing magnetic field distribution in an embodiment of this disclosure [Figure 3] A plan view (a) and a front cross-sectional view (viewed by arrow AA) (b) of a heat transport device representing another embodiment (1 / 4) of the present disclosure. [Figure 4]Plan view (a) and front sectional view (view taken along the line A-A) (b) of a heat transport device according to another embodiment (2 / 4) of the present disclosure [Figure 5] Plan view (a) and front sectional view (view taken along the line A-A) (b) of a heat transport device according to another embodiment (3 / 4) of the present disclosure [Figure 6] Plan view (a) and front sectional view (view taken along the line A-A) (b) of a heat transport device according to another embodiment (4 / 4) of the present disclosure [Figure 7] Plan view showing how heat is transported in a heat transport device according to an embodiment of the present disclosure Embodiments for Carrying Out the Invention

[0019] Embodiments of the present invention will be described below with reference to the drawings. (1) Overall configuration

[0020] As shown in FIG. 1, the heat transport device 1 includes a pair of sheet-like members 10, a partition wall 30 that partitions an accommodation space 20 sandwiched between the sheet-like members 10, a temperature-sensitive magnetic fluid 40 filled in the accommodation space 20, and a magnetic field generation unit 50 that generates a magnetic field in the accommodation space 20.

[0021] The pair of sheet-like members 10 are arranged at intervals in the front-back direction (the vertical direction in FIG. 1(b)). The sheet-like member 10 of the present embodiment is rectangular, but a sheet-like member having a shape other than rectangular may be adopted.

[0022] The partition wall 30 is a member that extends in a cylindrical shape from one sheet-like member 10 to the other sheet-like member 10, and partitions the accommodation space 20 between the sheet-like members 10. The partition wall 30 of the present embodiment is rectangular like the sheet-like member 10, but a partition wall having a shape other than rectangular may be adopted.

[0023] The magnetic fluid 40 has a property (temperature sensitivity) in which the magnetic body force F acting per unit volume decreases as the temperature rises in a magnetic field H (A / m) environment.

[0024] As shown in Figure 2, the magnetic field generating unit 50 generates a magnetic field with a magnetic field distribution in which the magnetic field strength is maximum at a predetermined reference position r along the front and back surfaces of the sheet-like member 10 within the containment space 20, and the magnetic field strength decreases as it moves away from the reference position r along the front and back surfaces. In this embodiment, the center position of the sheet-like member 10 is set to the reference position r.

[0025] This magnetic field generating unit 50 consists of multiple magnets 51 arranged at intervals along the front and back surfaces of the sheet-like member 10, with each magnet 51 positioned in a manner that results in the magnetic field distribution described above. In this case, each of the magnetic field generating units 50 is arranged along one (upper) surface of the sheet member 10.

[0026] In this embodiment, each magnet body 51 is arranged along the surface (outer surface) of one of the sheet-like members 10. Furthermore, each magnet body 51 in this embodiment is a magnet that is magnetized in the direction from one end of a cylinder toward the other end.

[0027] Furthermore, the magnetic field generating unit 50 is configured such that the magnetic field distribution of the entire magnetic field body 51 does not result in a bowl-shaped region of low magnetic field strength.

[0028] In this embodiment, the magnetic field generating unit 50 has magnet bodies 51 having the same magnetic properties arranged at equal intervals at two locations on either side of the reference position r in a predetermined first direction (up and down direction in Figure 1(a)) along the front and back surfaces of the sheet-like member 10, and at two locations on either side of the reference position r in a second direction (left and right direction in Figure 1) intersecting the first direction. Thus, each of the magnet bodies 51 is arranged in a cross shape.

[0029] (2) Variant Although embodiments of the present invention have been described above, it goes without saying that the present invention is not limited in any way to the above embodiments and can take various forms as long as they fall within the technical scope of the present invention.

[0030] For example, in the above embodiment, a configuration in which each magnet 51 is arranged along the surface (outer surface) of the sheet-like member 10 was illustrated. However, each magnet 51 may also be arranged along the back surface (inner surface) of the sheet-like member 10. In this case, each magnet 51 may be covered with a layer made of a non-magnetic material.

[0031] Furthermore, the above embodiment illustrates a configuration in which five magnet bodies 51 are arranged in a cross shape. However, any magnet body 51 that generates a magnetic field with a magnetic field distribution in which the magnetic field strength is maximum at a reference position r and decreases as it moves away from the reference position r is acceptable. For example, as shown in Figure 3, a configuration in which a total of nine magnet bodies 51 are arranged in three rows in the first direction and three rows in the second direction, centered on the reference position r, is also possible.

[0032] Furthermore, in the above-described example of the magnet body 51, a configuration in which five magnet bodies 51 are arranged in a cross shape was given to prevent the formation of a bowl-shaped region of low magnetic field strength in the overall magnetic field distribution of the magnet body 51. However, as a configuration to prevent the formation of a bowl-shaped region, for example, as shown in Figure 4, a configuration in which the magnet body 51 is placed only at the reference position r may also be used.

[0033] Furthermore, in the above embodiment, the magnetic field generating unit 50 only needs to generate a magnetic field with a magnetic field distribution in which the magnetic field strength is maximum at the reference position r and decreases as it moves away from the reference position r, and a magnet body 51 other than a cylindrical shape may be used.

[0034] Furthermore, in this embodiment, the heat dissipation means may be arranged in a region of the sheet member 10 that is away from the reference position r. Specific examples include, as shown in Figure 5, a heat sink 60 being provided as a heat dissipation means so as to surround a region on one surface of the sheet member 10 that is a certain distance away from the reference position r, or, as shown in Figure 6, a heat sink 60 being provided as a heat dissipation means so as to surround the end of the sheet member 10. In this configuration, a fan may also be provided to further promote heat dissipation from the heat sink 60.

[0035] (3) Function, Effect In the heat transport device 1 of the above embodiment, the temperature-sensitive magnetic fluid 40 is filled in the accommodation space 20 sandwiched between the sheet-like members 10, and a magnetic field is applied with a magnetic field distribution in which the magnetic field strength decreases as the distance from the predetermined reference position r in the accommodation space 20 increases (see FIG. 2).

[0036] Here, when the vicinity of the reference position r in the accommodation space 20 is heated by a heat source from one sheet-like member 10 side, the magnetic body force F2 acting on the magnetic fluid 40 farther from the reference position r is more dominant (F1 < F2) than the magnetic body force F1 acting on the magnetic fluid 40 near the reference position r, causing convection of the magnetic fluid 40 in the accommodation space 20. This is because the magnetic fluid 40 far from the reference position r tries to flow toward the reference position r, while the magnetic fluid 40 near the reference position r is pushed away by the magnetic fluid 40 far from the reference position r and tries to move away from the reference position r.

[0037] At this time, the magnetic fluid 40 near the reference position r is pushed away by the magnetic fluid 40 far from the reference position r and moves away from the reference position r (see the arrow h in FIG. 7). As a result of heat dissipation through the sheet-like member 10 on the side not in contact with the heat source or an area not sufficiently heated, it returns to the original temperature (i.e., the ambient temperature). On the other hand, the magnetic fluid 40 far from the reference position r is heated through the sheet-like member 10 in contact with the heat source while flowing toward the reference position r (see the arrow c in FIG. 7). Through such a cycle, heat from the heat source can be radiated to the outside.

[0038] And, due to the characteristic of transporting heat by convection of the magnetic fluid 40 in the accommodation space 20 in the heat transport device 1, there is no need to provide a complicated flow path, and the device configuration can be made simple. Also, since heat can be transported using the entire surface of the sheet-like member​​ Furthermore, in the heat transport device 1 of the above embodiment, a magnetic field with a desired magnetic field distribution can be generated by a plurality of magnets 51.

[0040] Furthermore, with the heat transport device 1 of the above embodiment, a region with a low magnetic field strength in a bowl shape is not formed in the magnetic field distribution. Therefore, it is possible to effectively prevent the magnetic fluid 40 from accumulating in such regions, which would reduce the heat dissipation efficiency.

[0041] Furthermore, in the above embodiment, the arrangement of each of the magnet bodies 51 can prevent the formation of a region with a low magnetic field strength in a mortar-like shape.

[0042] Furthermore, in the above embodiment, in a configuration in which a heat dissipation means is arranged on the sheet member 10, the heat dissipation means can promote heat dissipation from the reference position r. [Explanation of symbols]

[0043] 1...Heat transport device, 10...Sheet-like member, 20...Accommodation space, 30...Partition wall, 40...Magnetic fluid, 50...Magnetic field generating unit, 51...Magnet.

Claims

1. A pair of sheet-like members are arranged with a gap between them in the front and back directions, A partition wall extends tubularly from one sheet-like member to the other sheet-like member, thereby dividing the storage space sandwiched between each of the sheet-like members, A temperature-sensitive magnetic fluid is filled into the aforementioned containment space, The aforementioned containment space includes a magnetic field generating unit that generates a magnetic field with a magnetic field distribution in which the magnetic field strength is maximum at a predetermined reference position along the front and back surfaces of the sheet-like member, and the magnetic field strength decreases as it moves away from the reference position along the front and back surfaces. Heat transport device.

2. The aforementioned magnetic field generating unit is These are a plurality of magnets arranged at intervals along the front and back surfaces of the sheet-like member, The magnetic field distribution of the entire magnetic body is such that the magnetic field strength is maximum at the reference position, and decreases as the distance from the reference position increases, with each of the magnetic bodies being arranged in such a positional relationship. The heat transport apparatus according to claim 1.

3. The aforementioned magnetic field generating unit is The magnetic field distribution of the entire magnetic body is such that no region with a low magnetic field strength is formed in a bowl shape, and the magnetic bodies are arranged in such a positional relationship. The heat transport apparatus according to claim 2.

4. The aforementioned magnetic field generating unit is The magnet bodies having the same magnetic properties are arranged at equal intervals at the aforementioned reference position, at two locations on either side of the reference position in a predetermined first direction along the front and back surfaces of the sheet-like member, and at two locations on either side of the reference position in a second direction intersecting the first direction. The heat transport apparatus according to claim 3.

5. The sheet member is provided with heat dissipation means arranged in a region away from the reference position. The heat transport apparatus according to claim 1.

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