JP2016080225A - Heat transport device including loop type heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat transport device capable of improving heat transport capacity, and further having excellent cooling reliability to each heating element even when a plurality of heating elements is installed in a narrow space.SOLUTION: A heat pipe type heat transport device has a loop pipeline that has: a closed circulation path; and working fluid encapsulated inside the circulation path, and flowing in one direction of the circulation path. The circulation path has: a plurality of heat input parts at which heat is supplied from the outside; heat radiation parts the number of which is smaller than the number of the heat input parts, and at which the supplied heat is radiated; a steam flow passage communicating one end part of the heat input part with one end part of the heat radiation part; and a fluid flow passage communicating the other end part of the heat input part with the other end part of the heat radiation part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat transport device including a loop type heat pipe that transports heat using the latent heat of a working fluid enclosed in a sealed circulation path.

  In recent years, in automobiles and the like, the amount of exhaust heat has increased due to the digitization of in-vehicle components and the high performance of electronic components. For example, the amount of heat generated in an engine room is increasing. Furthermore, the number of mounted heating elements is increasing due to the digitization of in-vehicle components and the high performance of electronic components. On the other hand, for example, in order to extend the life of the battery mounted in the engine room, it is necessary to manage the temperature of these components mounted in the engine room.

  From the above, conventionally, a method of cooling the heat generating body by attaching a heat radiation fin to each heat generating body has been used. However, in the above-described method, there is a problem that layout space is restricted particularly in a narrow space in order to secure an installation space for the radiation fins. In addition, if an electric fan is used to forcibly cool the radiating fins, the number of electric fans mounted increases as the number of mounted heating elements increases. The problem of reduced reliability and the method of supplying cooling air to the heat radiating fins through the duct require a separate duct space, which makes it difficult to install the duct especially in a narrow space. There was also a problem.

  From the above, in order to cope with the increasing calorific value, further improvement in the heat transport efficiency of the heat transport device for transporting the heat of the heat source to the heat radiating part is increasingly emphasized for the cooling device of the heating element. ing. Therefore, in recent years, a cooling device having a circulation path in which the inside is deaerated has been proposed because of its excellent heat transport capability. As a cooling device having a circulation path, for example, a check valve is interposed between the heat radiating portion and the heat receiving portion, and a pressure chamber is interposed between the heat radiating portion and the check valve. There is a cooling device in which the refrigerant liquefied in the section is stored, and the horizontal cross-sectional area in the pressurized chamber is larger than the cross-sectional area in the direction orthogonal to the refrigerant circulation direction of the liquid phase tube (Patent Document) 1).

  However, in the cooling device of Patent Document 1, the cooling device can be reduced in height, that is, reduced in size, but the heat transport capability is not sufficient, and a plurality of heating elements can be reliably and collectively There was a problem that the cooling reliability was not sufficient.

JP 2013-83399 A

  The present invention has been made in view of the above-described problems of the prior art, can further improve the heat transport capability, and is excellent for each heating element even when a plurality of heating elements are installed in a narrow space. An object is to provide a heat transport device having cooling reliability.

  An aspect of the present invention includes a loop pipe having a sealed circulation path, and a working fluid enclosed in the circulation path in a reduced pressure (degassed) state and flowing in the circulation path in one direction. A heat pipe type heat transport device, wherein the circulation path has a plurality of heat input parts to which heat is supplied from the outside and a number smaller than the number of the heat input parts, and the supplied heat is released. A heat-dissipating part, a steam channel communicating one end of the heat input part and one end of the heat dissipating part, the other end of the heat input part and the other end of the heat dissipating part It is a heat transport device having a liquid flow path in communication.

  In the above aspect, a plurality of heat input portions are provided, and when each of the plurality of heat input portions receives heat from another external heat source (heating element), in each heat input portion, a liquid phase working fluid Vaporizes, and heat from an external heat source is transferred to the working fluid as latent heat. Since the inside of the circulation path is degassed, the number of steams of the working fluid vaporized in each heat input part is less than the number of the heat input parts from each heat input part via the steam flow path. It flows to the heat radiating part provided (for example, one place). The vapor of the working fluid that has flowed to the heat radiating portion is condensed in the heat radiating portion and releases the latent heat. The working fluid condensed into a liquid state in the heat radiating portion is returned from the heat radiating portion to each heat input portion via the liquid flow path.

  In addition, each heat input part is installed in series in the circulation path, and the working fluid sealed in the circulation path is made into a straight heat pipe (the flow of steam working fluid and the flow of working fluid in liquid phase are The amount of the working fluid enclosed in a heat pipe having a structure in which one end and the other end are sealed) is adjusted to an appropriate amount, so that liquid can be obtained at each heat input portion. The working fluid can be vaporized. Also, a mode in which the steam channel and the liquid channel extending from the heat radiating unit are branched for each heat input unit before the heat input unit, that is, a mode in which each heat input unit is installed in the circulation path in parallel By doing so, a liquid working fluid can also be vaporized in each heat input part.

  In the aspect of the present invention, the heat input section contains a first wick and a second wick disposed in communication with the first wick on the downstream side of the flow of the working fluid of the first wick. The second wick is a heat transport device having a capillary force smaller than that of the first wick.

  In an aspect of the present invention, the second wick includes a recess having an opening toward the downstream side of the flow of the working fluid, and the recess has an opening area of the opening that is smaller than an area of the bottom of the recess. It is a heat transport device having a large shape.

  An aspect of the present invention is the heat transport device in which the opening width of the concave portion is gradually reduced toward the upstream side of the flow of the working fluid.

  That is, in this aspect, the inner surface shape of the concave portion is a tapered shape with the opening side widened.

  An aspect of the present invention is the heat transport device in which the first wick is filled in a direction orthogonal to the flow direction of the working fluid.

  In the aspect of the present invention, a space for storing the working fluid arranged in communication with the first wick is provided on the upstream side of the flow of the working fluid of the first wick of the heat input portion. It is a heat transport device.

  An aspect of the present invention is a heat transport device in which the heat input section is provided with a thermal connector that is thermally connected to an external heat source.

  An aspect of the present invention is a heat transport device in which the heat dissipating part is thermally connected to a part of a metal member constituting a vehicle body.

  According to the aspect of the present invention, the loop heat pipe has a plurality of heat input portions thermally connected to the heat generator, and the number of heat received by the plurality of heat input portions is smaller than the number of heat input portions. (For example, one place) Heat is radiated by the provided heat radiating part, that is, heat from a plurality of heat generating elements can be released by a smaller number of heat radiating parts than the number of heat input parts. Cooling reliability equivalent to the case where the number of heating elements is smaller can be obtained. Further, according to the aspect of the present invention, a loop heat pipe is used, that is, the flow path of the vaporized working fluid and the flow path of the liquefied working fluid are distinguished as separate piping systems. Compared with ordinary heat pipes, the heat transport capacity is improved.

  Moreover, according to the aspect of the present invention, each of the plurality of heat input portions is thermally connected to another heating element, and each heat input portion is connected to one circulation path. Even when a large number of heating elements are attached in a narrow space, each heating element can be reliably cooled, and the reliability of these in-vehicle components is improved. In addition, because it has excellent cooling reliability for each heating element, for example, the heating element can be installed even in a narrow space such as in an engine room, and the flexibility of layout of each heating element is improved. To do.

  According to the aspect of the present invention, the second wick is disposed in communication with the first wick on the downstream side of the flow of the working fluid of the first wick, and the second wick is the first wick. Since it has a capillary force smaller than that of the wick, the liquid working fluid that has moved from the first wick to the second wick while reliably absorbing the liquid working fluid into the heat input portion by the capillary force of the first wick, Returning from the second wick to the first wick, that is, preventing the liquid working fluid from flowing back in the heat input section can be prevented. Further, by providing the wick in the heat input part, the working fluid can recirculate through the circulation path even if the heat radiating part is not disposed at a position higher than the heat input part.

  According to the aspect of the present invention, the second wick includes a recess having an opening toward the downstream side of the flow of the working fluid, and the opening area of the opening is larger than the area of the bottom of the recess. When the liquid working fluid that has been absorbed and moved from the first wick to the second wick receives heat and vaporizes, the working fluid vapor is smoothly discharged from the second wick. Since the steam of the working fluid is smoothly discharged from the second wick, the flow of the steam of the working fluid from the heat input section to the heat radiating section is smoothed, and the heat transport capability is further improved.

  According to the aspect of the present invention, since the opening width of the recess gradually decreases toward the upstream side of the flow of the working fluid, the vapor of the working fluid is more smoothly discharged from the second wick.

  According to the aspect of the present invention, since the first wick is filled in a direction orthogonal to the flow direction of the working fluid, the liquid working fluid can be sufficiently absorbed, and the liquid operation to the heat input portion can be performed. Fluid supply is facilitated.

  According to the aspect of the present invention, the space portion in which the liquid working fluid is stored in communication with the first wick is arranged on the upstream side of the flow of the working fluid of the first wick. Insufficient supply of the liquid working fluid to the can be prevented.

It is explanatory drawing which shows the outline | summary in the cross section of the heat transport apparatus which concerns on the example of 1st Embodiment of this invention. It is explanatory drawing which shows the outline | summary in the heat input part of the heat transport apparatus which concerns on the example of 1st Embodiment of this invention in a cross section. It is explanatory drawing of the usage example of the heat transport apparatus which concerns on the example of 1st Embodiment of this invention. It is explanatory drawing of the other usage-method example of the heat transport apparatus of this invention.

  Hereinafter, a heat transport device according to a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a heat transport device 1 according to a first embodiment includes a circulation path 2 formed from a sealed tube having a circular cross section, and is enclosed in the circulation path 2. And a working fluid (not shown) that flows in one direction counterclockwise. Since the inside of the circulation path 2 is deaerated, a loop type heat pipe is formed from the circulation path 2 and the working fluid. The circulation path 2 includes a plurality of (four in FIG. 1) heat input units 3, a smaller number (one in FIG. 1) of heat dissipating units 4, and one of the heat input units 3. And a liquid flow path 6 in which the other end of the heat input section 3 and the other end of the heat dissipation section 4 are in communication with each other. ing.

  The heat input unit 3 includes a first heat input unit 3-1, a second heat input unit 3-2, a third heat input unit 3, in order from the side close to the other end that is the outflow side of the liquid working fluid of the heat radiation unit 4. The heat input part 3-3 and the fourth heat input part 3-4 and the four heat input parts 3 are arranged in series in the circulation path 2. Therefore, the gaseous working fluid outflow side end of the fourth heat input section 3-4 is connected to the gaseous working fluid inflow end of the heat radiating section 4 via the vapor flow path 5. ing. In addition, the liquid working fluid inflow end of the first heat input section 3-1 is connected to the liquid working fluid outflow end of the heat radiating section 4 through the liquid flow path 6. ing. Also, the working fluid outflow side end of the first heat input unit 3-1, the working fluid inflow end of the second heat input unit 3-2, and the working fluid outflow side of the second heat input unit 3-2. Working fluid inflow side end portion of the end portion and the third heat input portion 3-3, working fluid outflow side end portion of the third heat input portion 3-3, and working fluid inflow of the fourth heat input portion 3-4 The side end portions are communicated with each other via the heat input flow passage 7.

  Accordingly, a portion of the circulation path 2 that is neither the heat input part 3 nor the heat dissipation part 4 is any one of the steam flow path 5, the liquid flow path 6, and the heat input part flow path 7.

  The first heat input section 3-1, the second heat input section 3-2, the third heat input section 3-3, and the fourth heat input section 3-4 are respectively heated with another heating element (not shown) and heat. Connected. That is, in the circulation path 2, a region that is thermally connected to the heat generating element that is a heat source and can receive heat from the heat generating element is the heat input portion 3. In addition, the heat exchange means (radiating fins 8 in FIG. 1) is attached to a predetermined part of the circulation path 2, so that the heat radiation portion 4 is formed in the circulation path 2. That is, in the circulation path 2, a region thermally connected to the heat exchanging means (a region where the radiation fins 8 are attached in FIG. 1) becomes the heat radiation unit 4. In FIG. 1, an electric fan 9 is attached adjacent to the heat radiation fin 8 in order to cool the heat radiation fin 8.

  When the first heat input unit 3-1, the second heat input unit 3-2, the third heat input unit 3-3, and the fourth heat input unit 3-4 receive heat from the heat generators that are thermally connected, respectively. In the first heat input section 3-1, the second heat input section 3-2, the third heat input section 3-3, and the fourth heat input section 3-4, the liquid working fluid is vaporized, Heat from the heating element moves to the working fluid as latent heat. More specifically, since the inside of the circulation path 2 is deaerated, the working fluid vaporized in the first heat input section 3-1 and the liquid state are maintained without being vaporized in the first heat input section 3-1. The working fluid moves from the first heat input section 3-1 to the second heat input section 3-2 via the heat input section flow path 7. Next, the working fluid already vaporized in the first heat input section 3-1, the working fluid vaporized in the second heat input section 3-2 without being vaporized in the first heat input section 3-1, and the first The working fluid that has not vaporized in the second heat input section 3-2 and still maintained the liquid state passes from the second heat input section 3-2 to the third heat input section 3-3 through the heat input section flow path 7. And move. Thereafter, similarly, the working fluid already vaporized in the first heat input section 3-1 or the second heat input section 3-2, the working fluid vaporized in the third heat input section 3-3, and the third The working fluid that has not been vaporized in the heat input section 3-3 and still maintained a liquid state passes from the third heat input section 3-3 to the fourth heat input section 3-4 via the heat input section flow path 7. ,Moving. Accordingly, both the liquid working fluid and the gaseous working fluid flow in the same direction in the heat input passage 7.

  And in the 4th heat input part 3-4 located in the most downstream side of the flow of a working fluid among the four heat input parts 3, it does not vaporize in the 3rd heat input part 3-3, but still maintains a liquid state The received working fluid receives heat from the heating element thermally connected to the fourth heat input section 3-4 and vaporizes.

  The working fluid vaporized in the first heat input section 3-1, the second heat input section 3-2, the third heat input section 3-3, or the fourth heat input section 3-4 as described above is converted into steam. By collectively moving from the fourth heat input section 3-4 to the heat radiating section 4 via the steam flow path 5, the heat from each heating element is changed to the first heat input section 3-1, the second heat input. The heat is transferred from the part 3-2, the third heat input part 3-3, and the fourth heat input part 3-4 to the heat radiating part 4 at once. The heat transferred to the heat radiating unit 4 is released to the outside of the heat transport device 1 by the heat radiating fins 8 which are heat exchange means. At the same time, the vapor of the working fluid that has moved to the heat radiating unit 4 condenses into a liquid state and is returned from the heat radiating unit 4 to the first heat input unit 3-1 through the liquid flow path 6.

  Next, the structure of the heat input part 3 will be described. For example, the working fluid can circulate in the circulation path 2 by installing the heat radiating unit 4 at a position higher than the heat input unit 3. Therefore, it can be set as the heat input part 3 by thermally connecting with the heat generating body which is a heat source in the position of the circulation path 2 lower than the heat radiating part 4, and heat is radiated from the heat input part 3 of the heat transport device 1. The heat of the heating element is transported to part 4.

  Further, by accommodating a wick having a capillary force inside the circulation path 2 corresponding to the position of the heat input unit 3, the liquid working fluid can be recirculated to the heat input unit 3. Regardless of the height relationship between the heat input parts 3, the heat input part 3 can function as the heat input part 3.

  A mode of the wick provided in the heat input section 3 is not particularly limited. For example, the first wick is separated from the first wick and is downstream of the working fluid flow of the first wick. A second wick arranged in communication with the second wick is accommodated in the heat input portion 3, and the second wick has a smaller capillary force than the first wick. In this aspect, the second wick communicated with the first wick downstream of the working fluid flow has a smaller capillary force than the first wick disposed upstream of the working fluid flow. The liquid working fluid moved from the first wick to the second wick by the capillary force of the second wick while reliably absorbing the liquid working fluid in the wick returns to the first wick from the second wick, That is, it is possible to prevent the liquid working fluid from flowing backward in the heat input portion 3. Therefore, it is possible to prevent a decrease in heat transport capability in the circulation path 2.

  Examples of the technique for making the capillary force generated in the second wick smaller than the capillary force generated in the first wick include a technique for making the porosity of the second wick larger than the porosity of the first wick. . Here, the porosity means the ratio of the volume of the space where no wick material is present to the volume occupied by the wick.

  An embodiment of the structure of the first wick and the second wick used for the heat input unit 3 of the heat transport device 1 will be described with reference to FIG. For convenience of explanation, only one heat input section 3 is omitted, and the heat input section 3 is enlarged and an outline of components of the heat input section 3 will be described. As shown in FIG. 2, the upstream end of the flow of the working fluid (not shown) flowing in one direction counterclockwise in the circulation path 2 of the second wick 12 faces the upstream end. The first wick 11 and the second wick 12 are in communication with each other by contacting the downstream end of the flow of the working fluid of the first wick 11.

  The first wick 11 is accommodated in the heat input section 3 of the circulation path 2 in a state of being filled in a direction orthogonal to the flow direction of the working fluid. That is, of the outer surface of the first wick 11, the outer surface that faces the inner surface of the circulation channel 2 that forms the heat input portion 3 is in contact with the inner surface of the circulation channel 2 that forms the heat input portion 3. Yes. Since the first wick 11 is filled in a direction perpendicular to the flow direction of the working fluid, the first wick 11 can sufficiently absorb the liquid working fluid, and as a result, the liquid wick into the heat input section 3 can be absorbed. A sufficient amount of working fluid can be secured. For the first wick 11, the length in the direction perpendicular to the flow direction of the working fluid: the ratio of the length in the direction parallel to the flow direction of the working fluid is not particularly limited, and the operation evaporated in the second wick 12 It is sufficient that the vapor of the fluid does not flow back to the space portion 16 described later, and the liquid working fluid 10 accommodated in the space portion 16 can be supplied to the second wick 12.

  In FIG. 2, the first wick 11 is arranged in communication with the first wick 11 at the upstream side of the flow of the working fluid of the first wick 11 of the heat input section 3, that is, at the inlet of the liquid working fluid of the heat input section 3. A space 16 in which the working fluid is stored is provided. The space portion 16 functions as a liquid reservoir for a liquid working fluid because the space is wider than the vapor flow path, the liquid flow path, and the heat input flow path of the circulation path 2. By providing the space portion 16 at the inlet portion of the heat input portion 3, the liquid working fluid 10 accommodated in the space portion 16 can be stored upstream of the first wick 11 in the flow of the working fluid. Insufficient supply of the liquid working fluid to the wick 11 can be reliably prevented.

  The second wick 12 is also accommodated inside the heat input portion 3 of the circulation path 2 in a state where the second wick 12 is filled in a direction orthogonal to the flow direction of the working fluid at the contact portion with the first wick 11. In addition, the outer surface of the second wick 12 that faces the inner surface of the circulation channel 2 that forms the heat input portion 3 is in contact with the inner surface of the circulation channel 2 that forms the heat input portion 3. Yes. That is, the dimension of the second wick 12 in the direction orthogonal to the flow direction of the working fluid is the same as the dimension of the first wick 11. On the other hand, the second wick 12 is formed with a recess 13 having an opening 14 with the opening facing the downstream side of the flow of the working fluid. The recess 13 has a shape in which the cross-sectional area in the direction orthogonal to the flow direction of the working fluid in the opening 14 is larger than the cross-sectional area of the bottom 15 of the recess 13.

  Due to the recess 13 having the above-described shape, the liquid working fluid that has moved from the first wick 11 to the second wick 12 receives heat inside the heat input portion 3 and is vaporized, and is discharged from the second wick 12. In this case, the pressure loss that the working fluid vapor receives by the structure of the second wick 12 is reduced. Accordingly, the vapor of the working fluid is smoothly discharged from the second wick 12 to the downstream side of the flow of the working fluid.

  As shown in FIG. 2, the second wick 12 has a recess 13 shape in which the opening 14 has the largest cross-sectional area and the bottom 15 has the smallest cross-sectional area. Further, in the second wick 12, the opening width of the concave portion 13 is gradually reduced from the downstream side to the upstream side of the flow of the working fluid, and the inner surface shape of the concave portion 13 is a tapered shape in which the opening portion 14 side is widened. It has become. Since the opening 14 side has a wide taper shape, the vapor of the working fluid is more smoothly discharged from the second wick 12 to the downstream side of the flow of the working fluid. The steam flow of the working fluid becomes smoother. Therefore, the heat transport capability of the circulation path 2 is further improved.

  In the second wick 12, the bottom 15 of the recess 13 is formed in the vicinity of the contact portion with the first wick 11. Accordingly, the working fluid vapor is smoothly discharged from the entire second wick 12.

  About the second wick 12, the length in the direction perpendicular to the flow direction of the working fluid: the length in the direction parallel to the flow direction of the working fluid (that is, from the upstream end of the flow of the working fluid to the opening 14) The ratio of (length) is not particularly limited. Further, the ratio of the length of the recess 13 from the opening 14 to the bottom 15: the opening width of the cross section in the direction orthogonal to the flow direction of the working fluid in the opening 14 is not particularly limited. Further, the inner surface shape of the recess 13 is parallel to the flow direction of the working fluid, for example, as shown in FIG. 2, because the pressure loss received by the vapor of the working fluid is reliably reduced by the structure of the second wick 12. The cross section in the direction is preferably substantially parabolic. Furthermore, the ratio of the length in the direction parallel to the flow direction of the working fluid in the second wick 12 to the length in the direction parallel to the flow direction of the working fluid in the recess 13 is not particularly limited. It is sufficient that the pressure loss experienced by the working fluid vapor can be reliably reduced at any of these locations.

  The ratio of the length in the direction parallel to the flow direction of the working fluid in the first wick 11 to the length in the direction parallel to the flow direction of the working fluid in the second wick 12 is not particularly limited. The ratio of 1: 5 to 1:90 is preferable from the viewpoint of the balance between the supply amount of the liquid working fluid and the vaporization efficiency of the working fluid. Further, the ratio of the length of the first wick 11 and the length of the space 16 in the direction parallel to the flow direction of the working fluid is not particularly limited, but the working fluid evaporated from the first wick 11 by the second wick 12 is not limited. The length of the first wick 11 parallel to the flow direction of the working fluid: the flow of the working fluid from the point of reliably supplying the working fluid stored in the space 16 to the second wick 12 while preventing the backflow The ratio of the length of the space 16 in the direction parallel to the direction is preferably 1:10 to 1:50. In the heat input section 3 of the heat transport device 1, the length of the first wick 11 parallel to the flow direction of the working fluid: the length of the space section 16 parallel to the flow direction of the working fluid. The ratio is 1:40.

  Next, the outer surface of the heat input part 3 of the heat transport apparatus 1 according to the first embodiment will be described. In the heat transport apparatus 1, the outer surface of the heat input part 3 can function as a thermal connector as it is. Therefore, the outer surface of the heat input portion 3 is also thermally connected to a heat generator as a heat source, thereby acting as a thermal connector. As an embodiment in which the outer surface of the heat input section 3 is thermally connected to a heat generating body that is a heat source, for example, an aspect in which the heat generating element is in direct contact with the outer surface of the heat input section 3 can be cited.

  Further, the structure of the vapor channel 5, the liquid channel 6, and the heat input channel 7 is not particularly limited. For example, a fixed tube having a straight portion and / or a curved portion may be used. Well, if necessary, in order to give flexibility to the piping of each of the above-mentioned channels, a Velod tube (tube having a bellows structure) may be used.

  Although it does not specifically limit about the material of the circulation path 2, For example, copper, copper alloy, aluminum, aluminum alloy, stainless steel, etc. can be used. Moreover, the material of the 1st wick 11 and the 2nd wick 12 is not specifically limited, For example, what sintered the mesh, the wire, the metal powder, etc. can be mentioned. The working fluid to be sealed in the internal space of the circulation path 2 can be appropriately selected according to the compatibility with the material of the circulation path 2, and can include, for example, water. Examples of other working fluids include alternative CFCs, Florina, and cyclopentane.

  Next, an example of how to use the heat transport device 1 according to the first embodiment of the present invention will be described below with reference to the drawings.

  As shown in FIG. 3, the heat transport device 1 is installed in the engine room 20 of the automobile, and in one heat transport device 1, a working fluid (not shown) flows through the circulation path 2 counterclockwise, A plurality of heating elements attached in the engine room 20 can be simultaneously cooled. Although the heating element thermally connected to the heat transport device 1 is not particularly limited, in FIG. 3, the first heat input unit 3-1 is the electronically controlled fuel injection device 21, and the second heat input unit 3-2 is DC / The DC converter 22, the third heat input section 3-3 are thermally connected to the engine control unit 23, and the fourth heat input section 3-4 is connected to the headlamp 24, respectively. Moreover, between the 4th heat input part 3-4 thermally connected with the headlamp 24, and the 1st heat input part 3-1 thermally connected with the electronic control fuel-injection apparatus 21 (in FIG. 3, Since the plurality of heat radiation fins 8 are attached to the outer surface of the circulation path 2 at the position of the circulation path 2 in the front position of the engine room 20, the heat radiation part 4 thermally connected to the heat radiation fins 8 One is formed. In FIG. 3, an electric fan 9 is attached adjacent to the radiation fin 8 in order to cool the radiation fin 8.

  The first heat input section 3-1 is from the electronic control fuel injection device 21, the second heat input section 3-2 is from the DC / DC converter 22, the third heat input section 3-3 is from the engine control unit 23, and the fourth. The heat input section 3-4 receives heat from the headlamp 24, the liquid working fluid is vaporized, and the heat received from each heating element moves to the working fluid as latent heat. The vapors of the working fluid vaporized in the respective heat input sections 3-1, 3-2, 3-3, 3-4 are converted into the respective heat input sections 3-1, 3-2, 3-3, 3-4. Flows from one through the steam flow path 5 to one heat radiating section 4. The vapor of the working fluid that has flowed to the heat radiating section 4 is condensed in the heat radiating section 4 and releases latent heat. The working fluid that has condensed into a liquid state is returned to each heat input section 3-1, 3-2, 3-3, 3-4 via the liquid flow path 6.

  Next, another embodiment of the present invention will be described. In the heat transport device 1 according to the first embodiment, as described above, the outer surface of the heat input section 3 can also function as a thermal connector, but the above-described normal heat pipe, heat conductive metal block, and thermal sheet are made of metal. You may thermally connect between the outer surface of the heat-input part 3, and a heat generating body using what was pinched | interposed with the board as a thermal connector. In addition, if necessary, a thermal sheet having excellent thermal conductivity may be provided between the thermal connector and the heating element to improve the thermal connectivity between the thermal connector and the heating element. Examples of the material for the thermal sheet include silicon.

  In the heat transport device 1 according to the first embodiment, each heat input section 3 is formed in series in the circulation path 2, but instead, the steam flow path and the liquid flow path extending from the heat radiating section are respectively provided. Each heat input section may be formed in parallel in the circulation path by branching each heat input section in front of each heat input section.

  In addition to thermally connecting the heat transport device 1 according to the embodiment of the present invention to the electronically controlled fuel injection device 21 and the like in the engine room 20 of the automobile, as shown in FIG. In the heat transport device 1 ′ according to the embodiment, a plurality of heat input portions 3 ′ (seven heat input portions 3 ′ in FIG. 4) are each thermally connected to the battery cell 25 via the thermal connector 28. By doing so, a plurality of battery cells 25 (seven battery cells 25 in FIG. 4) can be cooled simultaneously. In FIG. 4, a heat sink 27 having a plurality of radiating fins 8 ′ and a heat receiving plate 26 is thermally connected to the outer surface of the circulation path 2 ′, so that heat is radiated to the thermal connection portion of the heat sink 27 in the circulation path 2 ′. Part 4 'is formed.

  Moreover, when using the heat transport apparatus 1 of this invention in the engine room 20 of a motor vehicle, although the heat radiation part 4 was formed in the circulation path 2 using the radiation fin 8 as a heat exchange means, instead, A heat sink may be formed using a heat sink, and a heat radiating portion may be formed by thermally connecting a desired part of the circulation path to a metal member that is a sheet metal forming the engine room 20. Moreover, in the heat transport apparatus 1 which concerns on the example of embodiment of this invention, although the heat radiating part 4 was one place, if the number of installation of a heat radiating part is a number smaller than the number of heat input parts, it will not specifically limit. Therefore, two or more heat dissipating parts may be formed in series in the circulation path between the most upstream heat input part and the most downstream heat input part for the liquid working fluid. In this case, the heat radiating portion may be formed by any means such as thermal connection with a heat radiating fin, a heat sink, or a metal member, and the means may be used in combination.

  The heat transport device of the present invention has excellent cooling reliability with respect to each heating element even when a plurality of heating elements are installed in a narrow space. For example, it is installed in a narrow space such as an engine room of an automobile. It has high utility value in a field where it is necessary to cool a plurality of generated heating elements at once.

DESCRIPTION OF SYMBOLS 1, 1 'Heat transport apparatus 2, 2' Circulation path 3, 3 'Heat input part 4, 4' Radiation part 5 Steam flow path 6 Liquid flow path 10 Liquid working fluid 11 accommodated in the space part 1st wick 12 Second wick 13 Recess 16 Space

Claims (8)

A heat pipe type heat transport device having a loop pipe having a closed circulation path and a working fluid enclosed in the circulation path and flowing in one direction in the circulation path,
The circulation path includes a plurality of heat input parts to which heat is supplied from the outside, a heat dissipation part from which the supplied heat is released, the number of the heat input parts being less than the number of the heat input parts, and the heat input part. Heat transport having a vapor channel that communicates one end with one end of the heat dissipating unit, and a liquid channel that communicates the other end of the heat input unit and the other end of the heat dissipating unit apparatus. The heat input section accommodates a first wick and a second wick disposed in communication with the first wick downstream of the working fluid flow of the first wick;
The heat transport apparatus according to claim 1, wherein the second wick has a capillary force smaller than that of the first wick.   The second wick includes a recess having an opening toward a downstream side of the flow of the working fluid, and the recess has a shape in which an opening area of the opening is larger than an area of a bottom of the recess. 2. The heat transport device according to 2.   The heat transport device according to claim 3, wherein the opening width of the concave portion is gradually reduced toward the upstream side of the flow of the working fluid.   The heat transport device according to any one of claims 2 to 4, wherein the first wick is filled in a direction orthogonal to a flow direction of the working fluid.   The space part in which the said working fluid arrange | positioned by communicating with this 1st wick is stored in the upstream of the flow of the said working fluid of the said 1st wick of the said heat input part is provided. The heat transport apparatus according to any one of the above.   The heat transport device according to any one of claims 1 to 6, wherein the heat input section is provided with a thermal connector that is thermally connected to an external heat source.   The heat transport device according to any one of claims 1 to 7, wherein the heat dissipating part is thermally connected to a part of a metal member constituting a vehicle body.

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