JP2007074775A - Shield conductor - Google Patents

Abstract

[PROBLEMS] To improve heat dissipation efficiency.
SOLUTION Heat generated in a heat pipe 10 (conductor) moves outside the shield pipe 20 by circulating and circulating the working fluid in the heat pipe 10 while repeating evaporation and condensation. It is transmitted to 30 cooling water. Since the heat transmitted to the heat pipe 10 is forcibly taken away by the cooling water, the heat radiation efficiency is superior to that in the case where heat is radiated directly from the outer peripheral surface of the heat pipe 10 to the atmosphere.
[Selection] Figure 2

Description

  The present invention relates to a shield conductor.

As a shield conductor mounted on a vehicle such as an electric vehicle, a plurality of non-shielded electric wires are collectively shielded by being surrounded by a shield member made of a cylindrical braided wire in which fine metal wires are knitted in a mesh shape. The structure is considered. As a method for protecting the shield member and the electric wire in this type of shield conductor, generally, a means for surrounding the shield member with a protector made of synthetic resin is used, but there is a problem that the number of parts increases when the protector is used.
Therefore, the applicant of the present application has proposed a structure in which a non-shielded electric wire is inserted into a metal pipe as described in Patent Document 1. According to this structure, since the pipe exhibits the function of shielding the electric wire and the function of protecting the electric wire, there is an advantage that the number of parts can be reduced as compared with the shield conductor using the shield member and the protector.
JP 2004-171952 A

In shield conductors using pipes, there is an air layer between the wires and the pipe, so the heat generated in the wires when energized is blocked by the air with low thermal conductivity and is not easily transmitted to the pipes. Since the pipe does not have an external ventilation path such as a gap between stitches in the braided wire, the heat generated in the electric wire tends to be trapped inside the pipe and the heat dissipation tends to be low.
Here, the amount of heat generated when a predetermined current flows through the conductor decreases as the cross-sectional area of the conductor increases, and the temperature rise value of the conductor due to heat generation is suppressed as the heat dissipation of the conductive path increases. Therefore, in an environment where an upper limit is set for the temperature rise value of the conductor, in the case of a shield conductor with low heat dissipation efficiency as described above, it is necessary to increase the cross-sectional area of the conductor to suppress the amount of heat generation.
However, increasing the cross-sectional area of the conductor means that the shield conductor is increased in diameter and weighted, and a countermeasure is desired.
The present invention has been completed based on the above circumstances, and an object thereof is to improve heat dissipation efficiency.

  As a means for achieving the above object, the invention of claim 1 is a heat transfer device in which a conductor is inserted into a shield pipe, and heat generated in the conductor by energization is transferred to the outside of the shield pipe. It is characterized in that it has a pipe and a water cooling heat sink that has a flow path for circulating cooling water and is provided in a protruding portion of the heat pipe to the outside of the shield pipe.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the heat pipe is the conductor.

  The invention of claim 3 is characterized in that, in the invention described in claim 1 or claim 2, the water-cooled heat sink is provided with radiating fins.

  According to a fourth aspect of the present invention, there is provided the method according to any one of the first to third aspects, wherein the water-cooled heat sink includes an attachment portion for attaching heat transfer to a vehicle body of an automobile. Have

<Invention of Claim 1>
The heat generated in the conductor moves to the outside of the shield pipe as the working fluid circulates while repeating evaporation and condensation in the heat pipe, and is transmitted from the heat pipe to the cooling water of the water-cooled heat sink. In the present invention, since the heat transmitted to the heat pipe is forcibly taken away by the cooling water, the heat radiation efficiency is excellent as compared with the case where heat is radiated directly from the outer peripheral surface of the heat pipe to the atmosphere.

<Invention of Claim 2>
Since the heat pipe is used as a conductor, the conductor itself has a heat dissipation function, so that the heat dissipation efficiency is superior to that in which the heat of the conductor is transmitted to the heat pipe and released.

<Invention of Claim 3>
Of the heat transferred from the heat pipe to the water-cooled heat sink, the heat that has not been taken away by the cooling water is released into the atmosphere from the surface having a large heat radiation area of the heat radiation fins, so that the heat radiation efficiency is excellent.

<Invention of Claim 4>
In the present invention, focusing on the fact that the car body of an automobile can be used as an efficient heat radiator by utilizing an endothermic body and traveling wind having a large heat capacity, a water-cooled heat sink can be attached to the body of the automobile. With the water-cooled heat sink attached to the vehicle body, the temperature gradient between the water-cooled heat sink and the vehicle body is maintained by the heat absorption performance and heat dissipation performance of the vehicle body, and part of the heat transferred to the water-cooled heat sink is efficiently transferred to the vehicle body side. Since it is transmitted, the heat dissipation efficiency is improved.

<Embodiment 1>
A first embodiment of the present invention will be described below with reference to FIGS. An engine room is provided in the front part of a vehicle body Bd of an electric vehicle EV (a vehicle which is a constituent element of the present invention), and a device Ma (which constitutes a power circuit for driving the traveling motor Mo (in the engine room) For example, an inverter) and an engine Eg for driving gasoline are accommodated. A device Mb (for example, a battery) constituting a power circuit is mounted on the rear portion (for example, a trunk room) of the vehicle body Bd. A shield conductor Wa and an in-vehicle conductor Wb are routed between the two devices Ma and Mb.

  The shield conductor Wa is composed of three elongated heat pipes 10 used as conductors, and a shield pipe made of metal (for example, aluminum alloy, stainless steel, copper, copper alloy, etc.) having both a collective shield function and a heat pipe 10 protection function. 20. The heat pipe 10 seals the inside of a cylindrical metal tube material in an airtight manner, encloses a working fluid (for example, water) in the sealed working space, and has an inner periphery on the low temperature side of the heat pipe 10 ( It has a known structure in which a wick (not shown) for returning the working fluid moved to the heat radiating portion 15) to the high temperature side is attached. The outer periphery of each heat pipe 10 is covered with an insulating coating 11 made of high synthetic resin made of heat conduction.

  The three heat pipes 10 are collectively penetrated through one shield pipe 20, and both front and rear end portions of the heat pipe 10 are led out (projected) to the outside of the shield pipe 20. Outside the shield pipe 20, rod-like connecting members 13 are fixed to the front and rear end faces (projecting end faces) of the heat pipe 10 so as to be conductive by cold welding or the like. At the end of the connection member 13 opposite to the heat pipe 10, an open barrel-shaped crimping portion 14 is formed as a connection means to the in-vehicle conductor Wb. In addition, although the front-end part of the heat pipe 10 is represented in FIG. 2, since it is the same structure as a front-end part about a rear-end part, illustration is abbreviate | omitted.

  The in-vehicle conductor Wb is formed by collectively bundling three non-shielded flexible electric wires 40 (not shown) with a flexible shield member 41 made of a braided wire obtained by knitting fine metal wires in a mesh shape. The core wire 40a made of a stranded wire exposed by peeling off the resin coating 40b at the end portion of the electric wire 40 of the in-vehicle conductor Wb is fixed to the crimping portion 14 of the connecting member 13 so as to be conductive by crimping. Has been. The rear end portion of the flexible shield member 41 of the in-vehicle conductor Wb routed on the front side of the vehicle body Bd is connected to a water-cooled heat sink 30 described later, and the in-vehicle conductor Wb routed on the rear side of the vehicle body Bd. The end portion of the flexible shield member 41 is connected to the rear end portion of the shield pipe 20 so as to be conductive. Further, the outer periphery of a portion (including the crimping portion 14) extending from the front end portion of the heat pipe 10 to the region surrounded by the resin coating 40 b at the end portion of the electric wire 40 is provided as waterproof means inside the flexible shield member 41. The heat shrinkable tube 42 is attached in close contact with the liquid.

  The shield conductor Wa is routed substantially horizontally along the floor under the vehicle body Bd (below the floor plate Fp). At both front and rear end portions of the shield conductor Wa, the front end portion of the shield pipe 20 is fixed to the vehicle body Bd by the bracket 21 in a suspended state. The in-vehicle conductor Wb connected to the front end portion of the shield conductor Wa passes through the floor board Fp, is routed in the engine room, and is connected to the device Ma. On the other hand, the in-vehicle conductor Wb connected to the rear end portion of the shield conductor Wa is routed in the vehicle through the floor plate Fp and connected to the device Mb.

  Now, the front end portion of the heat pipe 10 protruding forward from the shield pipe 20 is a heat radiating portion 15 for releasing heat generated in the heat pipe 10 when the heat pipe 10 is energized. The heat radiating portion 15 is provided with a water-cooled heat sink 30 as means for improving the heat radiation efficiency, and the water-cooled heat sink 30 is fixed to the outer surface (lower surface) of the floor board Fp in order to further improve the heat radiation efficiency. . Therefore, the heat radiating part 15 is attached to the floor board Fp via the water-cooled heat sink 30.

Next, the water-cooled heat sink 30 will be described.
The water cooling heat sink 30 includes a holding body 31 and a fixture 35. The holding body 31 is made of a metal material having high thermal conductivity, and has a substantially rectangular shape (block shape). Three holding holes 32 penetrating in the front-rear direction are formed in the holding body 31, and the heat radiating portion 15 of the heat pipe 10 is passed through each holding hole 32. Inside the holding body 31, a flow path 33 for flowing cooling water (not shown) in one direction is formed. The flow path 33 is a form bent in a distorted manner in the holding body 31, that is, a form in which the ends of a plurality of linear parts 33 a arranged in parallel are sequentially connected by a substantially semicircular curved part 33 b. The length direction (left-right direction) of 33a is substantially perpendicular to the length direction (front-back direction) of the holding hole 32 (heat pipe 10). And the holding hole 32 is arrange | positioned in the downward vicinity of these linear parts 33a. That is, the flow path 33 is disposed between the upper surface of the holding body 31 and the heat radiating portion 15. Further, the cooling water flowing through the flow path 33 is not in direct contact with the outer peripheral surface of the heat radiating portion 15 (insulating coating 11) of the heat pipe 10. Furthermore, one end of the flow path 33 is opened on one outer surface of the holding body 31, and the other end of the flow path 33 is opened on the outer surface on the opposite side of the holding body 31. A cooling pipe P of a cooler (not shown) for cooling the device Ma is connected to the opening.
In addition, as a formation means of the flow path 33, the holding body 31 is divided into two parts, and a crease-like groove is formed on at least one opposing surface (contact surface) of the two divided bodies. 33 and a method of fitting a pipe serving as the flow path 33 into the groove formed as described above.

  Further, a pair of attachment portions 34 are formed in a rib shape so as to extend along the upper edge from the left and right side edges of the holding body 31. Note that the flexible shield member 41 of the above-mentioned front-side in-vehicle conductor Wb is connected to the front end surface of the holding body 31 so as to be conductive. A shield shell (not shown) that collectively surrounds the three heat pipes 10 is provided between the front end portion of the shield pipe 20 and the rear end surface of the holding body 31 so as to be conductive.

  The fixture 35 is made of a metal plate, and has a substantially “U” -shaped cover portion 36 that is in surface contact with the lower surface of the holding body 31 and both left and right side surfaces, and the lower surface of the mounting portion 34 that extends from the left and right edges of the cover portion 36. A pair of left and right support plate portions 37 that are in surface contact with each other, and a plurality of radiating fins 38 that form a plate shape extending substantially perpendicularly from the outer surfaces of the cover portion 36 and the support plate portion 37. The plate surface of the radiating fin 38 is oriented in parallel with the straight portion 33 a of the flow path 33. A metal bolt 39 is passed through the support plate portion 37 of the fixture 35 from below. The bolt 39 passes through the attachment portion 34 of the holding body 31 and is screwed into a female screw portion (not shown) of the floor board Fp. By tightening the bolt 39, the upper surface of the fixture 35 of the water-cooled heat sink 30 and the upper surface of the mounting portion 34 are attached so as to be able to conduct in a substantially surface contact state with the lower surface (outer surface) of the floor board Fp. The heat radiating portion 15 of the heat pipe 10 is attached to the vehicle body Bd (floor plate Fp).

Next, the operation of this embodiment will be described.
When the heat pipe 10 is energized, the heat pipe 10 generates heat, the region of the heat pipe 10 accommodated in the shield pipe 20 becomes high temperature, and the heat radiating portion 15 located outside the front of the shield pipe 20 is relatively low in temperature. Therefore, a temperature gradient is generated between the inside of the shield pipe 20 and the heat radiating portion 15. Then, the liquid working fluid in the heat pipe 10 evaporates and absorbs latent heat, the vapor moves toward the heat radiating portion 15, and the vapor condenses in the heat radiating portion 15 to release latent heat to become liquid. The operation of returning to the high temperature side is repeated, whereby the heat in the shield pipe 20 moves to the heat radiating portion 15 outside the shield pipe 20.

  The heat transferred to the heat radiating portion 15 is transmitted from the outer periphery of the heat radiating portion 15 to the inner periphery of the holding hole 32, moves inside the holding body 31, reaches the inner peripheral surface of the flow path 33, and flows in the flow path 33. After being taken away by the cooling water and carried to the cooler by the cooling water, it is released into the atmosphere. In addition, heat that has not been taken away by the cooling water among the heat moving inside the holding body 31 moves to the upper surface in FIGS. 2 and 3 of the holding body 31 and is transmitted to the metal floor board Fp to be transmitted to the floor board Fp. To the entire vehicle body Bd. Further, a part of the heat transmitted from the heat radiating portion 15 to the holding body 31 moves to the lower surface of the holding body 31 in FIGS. 2 and 3 and the left and right side surfaces in FIG. 3 and is transmitted to the cover portion 36 of the fixture 35. The heat is dissipated from the surface of the cover part 36 into the atmosphere, and is moved from the cover part 36 to the heat dissipating fins 38 to be dissipated from the surface of the heat dissipating fins 38 to the air.

  In the present embodiment, the heat generated when the heat pipe 10 is energized moves to the heat radiating portion 15 outside the shield pipe 20 by circulating and moving the working fluid in the heat pipe 10 while repeating evaporation and condensation. It is transmitted from the part 15 to the cooling water of the water-cooled heat sink 30. In this way, since the heat transmitted to the heat pipe 10 is forcibly taken away by the cooling water, the heat radiation efficiency is improved as compared with the case where heat is radiated directly from the outer peripheral surface of the heat radiating portion 15 of the heat pipe 10 to the atmosphere. Are better.

In addition, since the heat pipe 10 is used as a conductor and the conductor itself has a heat dissipation function, the conductor and the heat pipe are separated from each other, and the heat of the conductor is transmitted to the heat pipe and released. Excellent heat dissipation efficiency.
Further, the heat-radiating fins 38 are provided on the water-cooled heat sink 30, and the heat transferred from the heat pipe 10 to the water-cooled heat sink 30 that is not taken away by the cooling water enters the atmosphere from the surface of the heat-radiating fins 38 having a large heat radiation area. Because it is released, it has excellent heat dissipation efficiency.

  Further, paying attention to the fact that the vehicle body Bd of the automobile can be used as a heat absorber and a heat radiator having a large heat capacity, a water-cooled heat sink 30 provided so as to be able to transfer heat to the heat radiating portion 15 of the heat pipe 10 is replaced with a vehicle body Bd. It was made to attach to the floor board Fp so that heat could be transferred. When the water-cooled heat sink 30 is attached to the vehicle body Bd, the temperature gradient between the water-cooled heat sink 30 and the vehicle body Bd is maintained by the heat dissipation performance of the vehicle body Bd, and heat is efficiently transferred from the water-cooled heat sink 30 to the vehicle body Bd side. Is transmitted to. Therefore, the heat radiation efficiency is better than that of a configuration in which the water-cooled heat sink 30 is not attached to the vehicle body Bd.

<Other embodiments>
The present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, three heat pipes (conductors) are inserted into one shield pipe, but according to the present invention, the number of heat pipes inserted into one shield pipe is one, two Any of four or more may be used.
(2) In the above embodiment, the wick is attached to the inner periphery of the heat pipe. However, according to the present invention, the wick may not be provided.
(3) In the above embodiment, the heat sink is provided with the heat radiation fins, but according to the present invention, such a heat radiation fin may not be provided.
(4) In the above embodiment, the heat sink is attached to the vehicle body so that heat can be transferred. However, according to the present invention, heat may not be transmitted from the heat sink to the vehicle body.
(5) In the above embodiment, the cooling water of a cooler for other equipment (for example, an inverter) is diverted to a water-cooled heat sink. However, according to the present invention, water cooling is performed separately from the cooling water of the cooler for other equipment. You may use the cooling water only for a heat sink.
(6) In the above embodiment, the cooling water flow path is disposed between the heat pipe and the vehicle body. However, according to the present invention, the flow path may be disposed on the opposite side of the vehicle body with the heat pipe interposed therebetween. .
(7) In the above embodiment, the heat pipe is used as a conductor. However, according to the present invention, the heat pipe and the conductor may be separated. In this case, the heat generated in the conductor is transferred to the heat pipe and moves to the outside of the shield pipe.
(8) In the above embodiment, the water-cooled heat sink is provided only in front of the shield pipe. However, according to the present invention, the water-cooled heat sink is also provided behind the shield pipe, and the rear end portion of the heat pipe also functions as a heat radiating portion. Also good.
(9) In the above embodiment, the flow path is formed in a twisted shape. However, according to the present invention, the flow path extends linearly along the heat radiating portion of the heat pipe, or the heat enveloping portion is surrounded spirally. It may be.
(10) In the above embodiment, only one flow path is provided. However, according to the present invention, a plurality of flow paths may be provided.
(11) In the above embodiment, the cooling water is not in direct contact with the heat radiating portion of the heat pipe. However, according to the present invention, the cooling water may be in direct contact with the heat radiating portion of the heat pipe.
(12) Although the example applied to the electric vehicle has been described in the above embodiment, the present invention can be applied not only to the vehicle but also to the wiring in the cubicle of the high-voltage power receiving facility. Specifically, the shield conductor of the present invention is routed as a receiving wire from the storage box that houses the circuit breaker to the power pole of the transmission line, and a water-cooled heat sink is installed at both ends of the shield conductor, that is, the power pole and the storage box. It can be set as the structure provided. The shield conductor of the present invention can also be used as a wiring means for connecting the receiving wire and the circuit breaker in the storage box, and can also be used as a local wiring means from the circuit breaker in the storage box to the premises. it can.

Overall configuration diagram of Embodiment 1 Partial enlarged vertical sectional view showing the structure of a water-cooled heat sink Partial enlarged cross-sectional view showing the structure of a water-cooled heat sink Bottom view of water-cooled heat sink

Explanation of symbols

EV ... Electric car (car)
Bd ... body Wa ... shield conductor 10 ... heat pipe (conductor)
20 ... Shield pipe 30 ... Water-cooled heat sink 33 ... Channel 34 ... Mounting portion 38 ... Radiation fin

Claims (4)

A conductor is inserted in the shield pipe,
A heat pipe that moves heat generated in the conductor by energization to the outside of the shield pipe; and
A shield conductor having a flow path for circulating cooling water and a water-cooled heat sink provided at a protruding portion of the heat pipe to the outside of the shield pipe. The shield conductor according to claim 1, wherein the heat pipe is the conductor. The shield conductor according to claim 1, wherein the water-cooled heat sink is provided with a radiation fin. 4. The shield conductor according to claim 1, wherein the water-cooled heat sink includes an attachment portion that is attached to a vehicle body so that heat can be transferred. 5.

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