JP2010133686A - Heat pipe and cooler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pipe and a cooler capable of cooling a heating element by efficiently transporting heat in a minimum space by solving a problem that the installation of the heat pipes is limited due to an installation space though the heat transporting efficiency can be improved by increasing the number of installed heat pipes. <P>SOLUTION: This heat pipe 10 includes a pipe body 12 composed of copper or copper alloy and having a plurality of holes 11 in a sealed state, and the working water W sealed inside of the pipe body 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat pipe used as a heat transfer path and a cooler including the heat pipe.

A heat pipe is provided as a component of a cooler for cooling a semiconductor element that is a heating element, together with a heat radiating fin that is a cooling means, and operates a condensable fluid in a sealed pipe made of metal. It is configured to be sealed as a fluid. In such a heat pipe, the working fluid evaporates by heat transferred from the heating element on one end side, moves as a gas to the other end side in the pipe, dissipates heat on the other end side, cools and condenses as a liquid. Move to one end. By repeating this cycle, the heat transmitted from the heating element on one end side can be efficiently transported to the other end side, thereby efficiently cooling the heating element. In recent years, a plurality of heat pipes may be disposed in order to cool the heating element more efficiently (see, for example, Patent Document 1).
JP-A-6-137775

  However, according to Patent Document 1, although the efficiency of heat transport can be increased by increasing the number of installed heat pipes, the number of installed heat pipes is limited by the size of the heating element and the installation space, resulting in efficient operation. There was a problem that heat could not be transported and the heating element could not be cooled effectively.

  The present invention has been made in view of the above-described circumstances, and provides a heat pipe and a cooler that can efficiently transport heat in a minimum space to cool a heating element.

In order to solve the above problems, the present invention proposes the following means.
The heat pipe of the present invention comprises a pipe body made of copper or a copper alloy and formed with a plurality of sealed holes, and working water sealed inside the pipe body.

  According to this configuration, working water is sealed as a working fluid inside the pipe body. For this reason, heat transport can be carried out more efficiently than alternative chlorofluorocarbons. Also, because the pipe body is made of copper or copper alloy, it corrodes with working water and generates gas inside the pipe body, and the gas stays and exchanges heat with the cooling means in the pipe body. It is possible to prevent the possible area from being reduced and the heat transport efficiency from decreasing. A plurality of holes are formed in the pipe body. For this reason, compared with a pipe having the same cross-sectional area in one hole, it is possible to increase the sum of the peripheral area of the hole, thereby efficiently transferring heat between each of the heating element and the cooling means. Exchanges can be made. Also, compared to the case where a plurality of pipes having one hole with the same cross-sectional area as each hole of the pipe body are provided, the occupied space can be reduced as a whole, and it is compact and efficient from the heating element. The heat can be transported to the cooling means to cool the heating element.

  In the heat pipe, it is preferable that the pipe body is formed with a communicating portion that communicates the holes in a sealed state at both ends of the hole.

  According to this structure, the working water which exists in each hole can be circulated so that it may pass through another hole through the communicating part of both ends. That is, working water that has become a gas phase due to heat from the heating element at one end of one hole is moved to the other end side, and the other end releases heat to the cooling means to cool and condense into the liquid phase. Can be moved from the other end of the other hole to the one end side through the communicating portion. For this reason, it is possible to prevent the vapor-phase working water from circulating in the liquid-phase working water and preventing it from circulating and becoming unable to transport heat within one hole, thereby further efficiently heating. Can be transported.

  Further, in the above heat pipe, a plurality of the pipe main bodies are provided, and the holes are hermetically sealed by headers that are provided at both ends of the plurality of pipe main bodies and communicate with the holes of the pipe main bodies. It is preferable.

  According to this configuration, the working water present in each hole can be circulated so as to pass through the other holes of the same pipe body or the holes of the other pipe bodies through the headers at both ends. That is, working water that has become a gas phase due to heat from the heating element at one end of one hole is moved to the other end side, and the other end releases heat to the cooling means to cool and condense into the liquid phase. Can be moved from the other end of the other hole to one end through the header. For this reason, it is possible to prevent the vapor-phase working water from circulating in the liquid-phase working water and preventing it from circulating and becoming unable to transport heat within one hole, thereby further efficiently heating. Can be transported.

  In the above heat pipe, it is more preferable that the pipe body is formed in a flat shape as a whole so that the plurality of holes are arranged in a line on substantially the same plane.

  According to this configuration, since it is formed in a flat shape as a whole, attachment to the heating element and the cooling means can be facilitated, and the contact area with each can be increased. The generated heat can be transported to a cooling means for cooling.

  In the above heat pipe, it is more preferable to include a covering body made of aluminum or an aluminum alloy that covers the pipe body and to which the heating element and the cooling means are connected.

  According to this structure, a pipe main body, a heat generating body, and a cooling means can be united by a coating body. Here, since the covering body is made of aluminum or an aluminum alloy, it can be firmly connected to the heating element and the cooling means without hindering the heat conduction between the pipe body, the heating element and the cooling means. .

  In the heat pipe, the pipe body may be formed such that each of the holes is endless.

  According to this configuration, within the range where the heating element is provided, the heat from the heating element evaporates what shows the liquid phase in the working water inside the pipe body, and the pressure rises. On the other hand, in the range in which the cooling means is provided, the heat indicating the gas phase in the working water inside the pipe body cools and condenses, and the pressure decreases, by radiating heat to the cooling means. For this reason, a pressure difference is generated between the range where the heating element is provided and the range where the cooling means is provided, and the working water circulates in each endlessly formed hole of the pipe body. Can be efficiently transported to the cooling means and cooled.

  In the above heat pipe, the pipe body includes a first pipe body disposed on the heating element side, and a second pipe having one end connected to the first pipe body and a cooling means. It may be provided with a pipe body.

  According to this configuration, the working water exists as a liquid phase in the hole of the first pipe body, evaporates due to heat from the heating element, and exists as a gas phase in the hole of the second pipe body, Heat can be transported by circulating between the hole in the first pipe body and the hole in the second pipe body. Here, the first pipe body has a plurality of holes, and the working water exists as a liquid phase in each. For this reason, compared with the case where working water exists in one hole having the same cross-sectional area, it is possible to ensure a large area that can be opposed to the working water from the outside even in an inclined state. . For this reason, even if it is mounted on a vehicle, even if the inclination state changes, it is possible to stably heat transport and cool the heating element.

Moreover, the cooler of this invention is provided with said heat pipe and the cooling means connected to this heat pipe, It is characterized by the above-mentioned.
According to this configuration, the heat transferred from the heating element can be efficiently transported by the heat pipe and cooled by the cooling means.

In the heat pipe of the present invention, by providing the pipe main body and the working water, the heat generator can be cooled by efficiently transporting heat in a minimum space.
Moreover, in the cooler of this invention, by providing said heat pipe, heat transport can be efficiently performed by carrying out heat transport efficiently in the minimum space.

(First embodiment)
A first embodiment according to the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 4, the cooler 1 according to this embodiment includes a heat pipe 10 to which a heating element H such as a semiconductor element is connected, and is connected to the heat pipe 10 and transported by the heat pipe 10. It has the radiation fin 2 which is a cooling means which radiates heat and cools. The heat pipe 10 includes a pipe body 12 in which a plurality of holes 11 are formed, a working water W existing in each hole 11 of the pipe body 12, and a covering that is a covering provided to cover the pipe body 12. Plate 13. The working water W is mainly made of water, and is pure water in this embodiment.

  The pipe body 12 is made of copper or a copper alloy. Further, the pipe body 12 is arranged in a line so that the holes 11 are substantially parallel on substantially the same plane, and is formed in a flat shape having flat surfaces 12a and 12a as a whole. Further, the cross section of each hole 11 is formed in an arc shape at a portion adjacent to each other, and is formed in a linear shape at a portion facing the flat surface 12a, and is formed in a substantially elliptic shape as a whole. In addition, both edge parts 12b and 12b of the pipe main body 12 are formed in the curved surface of the cross-sectional semicircle shape corresponding to the hole 11 of both edge sides, and, thereby, the thickness to the said hole 11 becomes substantially constant. Yes. In addition, communication portions 14 and 15 that connect the holes 11 to each other are formed at both ends in the axial direction of the holes 11. In addition, the shape which has each hole 11 and the communication parts 14 and 15 of the pipe main body 12 cuts in both ends, after forming the shape which has each hole 11 by drawing the base material which consists of copper or a copper alloy, for example To obtain the communication portions 14 and 15. And the outer side of the communication parts 14 and 15, ie, the both ends of the pipe main body 12, are obstruct | occluded by the lid | covers 16 and 17, and the hole 11 and the communication parts 14 and 15 are made into the sealing state. As shown in FIGS. 2 and 3, one lid 17 of the pipe body 12 is provided with an introduction port 17 a in advance. Then, a predetermined amount of the working water W is injected into the inside from the introduction port 17a, and the working water W is sealed by closing the introduction port 17a after degassing the inside.

  The covering plate 13 is formed in a substantially plate shape made of aluminum or an aluminum alloy, and the pipe body 12 is embedded therein. And the heat generating body H and the radiation fin 2 are each attached to the coating | coated plate 13 by brazing etc. in the position used as the one end part side and other end part side of the pipe main body 12, respectively.

Next, the operation of the cooler 1 and the heat pipe 10 of this embodiment will be described.
As shown in FIGS. 1 to 3, when heat is generated from the heating element H, the heat is passed through the cover plate 13 and the pipe body 12 to the inside of the communication portion 14 on one end side of the pipe body 12 and the holes 11. It will be transmitted to the existing working water W. As a result, the working water W changes from the liquid phase to the gas phase by being heated and evaporated. The working water W that has become a gas phase circulates to the other end side where the heat dissipating fins 2 are provided. On the other end side, the heat of the working water W is transmitted to the heat radiating fins 2 through the pipe body 12 and the covering plate 13 to be radiated, thereby being cooled and condensed, and changed from the gas phase to the liquid phase. Will be. And the working water W which became the liquid phase distribute | circulates from the other end part side to the one end part side, circulates, and, thereby, the heat transmitted from the heat generating body H from the one end part side to the other end side. And radiated by the radiating fins 2 to be cooled.

  Here, in this embodiment, water is used as the working fluid. For this reason, heat transport can be carried out more efficiently than alternative chlorofluorocarbons. Further, since the pipe body 12 is made of copper or a copper alloy, the pipe body 12 is corroded by the working water W to generate gas inside the pipe body 12, and the gas stays, so that the radiating fins 13 in the pipe body 12. It is possible to prevent the area where heat can be exchanged and the efficiency of heat transport from being reduced. The pipe body 12 has a plurality of holes 11 as described above. For this reason, compared with the pipe which has the same cross-sectional area with the one hole 11, the sum of the peripheral area of the hole 11 can be enlarged, and, thereby, between each of the heat generating body H and the radiation fins 2 is possible. Heat can be exchanged efficiently. In addition, compared to the case where a plurality of pipes having one hole having the same cross-sectional area as each hole 11 is provided, the occupied space can be reduced as a whole, and it is compact and efficient from the heating element H. Heat can be transported to the radiation fins 2 to cool the heating element H.

  In addition, since each hole 11 of the pipe body 12 is communicated at both ends via the communication portions 14 and 15, the working water W changes from the liquid phase to the gas phase in one hole 11 from one end side. After moving to the other end side and changing from the gas phase to the liquid phase on the other end side, the other hole 11 is circulated from the other end side to the one end side through the communication portions 14 and 15. It will be circulated. For this reason, it is possible to prevent the vapor-phase working water W from preventing the circulation of the liquid-phase working water W in one hole 11, thereby preventing circulation and heat transport from being performed. Heat transport can be performed well.

Moreover, in this embodiment, since the pipe main body 12 is formed in the flat shape as a whole so that the several hole 11 may be arranged in a line on a substantially identical plane, attachment with respect to the heat generating body H and the radiation fin 2 is carried out. While being easy, the contact area with each can be increased, and the heat generated from the heating element H can be more efficiently transported to the radiation fins 2 for cooling. Further, in the present embodiment, by providing the covering plate 13 made of aluminum or aluminum alloy, the heat generating element H and the heat generating element H and the heat generating element H and the heat dissipating fins 2 are not hindered. The radiating fin 2 can be firmly connected.
Next, the Example which performed the performance test about the heat pipe 10 of this embodiment is shown below.

  In this example, the results of a comparative performance test and Comparative Example 1 made of aluminum and using alternative chlorofluorocarbon as the working fluid are shown. FIG. 5 shows the relationship between the heat generation amount (W) in the heating element H and the thermal resistance value (K / W) of the heat pipe 10. The thermal resistance value is a value obtained by dividing a temperature difference between the temperature at a predetermined position of the heating element H and the temperature at a predetermined position of the cooling air flowing from the fan into the radiating fin 2 by the heat generation amount.

  Here, in the pipe body 12 of the first embodiment, referring to FIG. 4, a pipe body having a total width W = 29.7 mm and a thickness T = 5.4 mm is used, and five holes 11 are formed. Used were those having a major axis D1 = 5.28 mm, a minor axis D2 = 4.5 mm, and a circumferential length L = 15.7 mm. About the comparative example 1, what consists of aluminum and has the same shape was used, and what injected alternative CFC as a working fluid was used.

  As shown in FIG. 5, in the heat pipe 10 of this example, it can be seen that, as a whole, the heat resistance value can be lowered as compared with the comparative example 1, and the heat can be efficiently transported. This is because the working water W is used as the working fluid as described above. Further, in Comparative Example 1, the thermal resistance value tends to decrease as the heat generation amount increases up to 1000 W, but the thermal resistance value increases as it becomes 1000 W or more. On the other hand, in Example 1, any calorific value was able to show a low and stable value as compared with Comparative Example 1.

In this example, a comparative performance test was conducted with Comparative Example 2 in which the working water W was sealed in a pipe in which only one hole made of the same copper was formed.
In the second embodiment, three pipe bodies 12 of the first embodiment are used, the heat generation amount of the heat generating element H is 500 W, and the heating element H is predetermined when the cooling air is blown from the fan to the heat radiating fins 2 at a rate of 2 m per second. The temperature difference between the temperature at the position and the temperature at the predetermined position of the cooling air flowing from the fan into the radiating fin 2 was measured. As a result, the temperature difference was 41.2K.

  On the other hand, as Comparative Example 2, a pipe in which one hole having the same circumferential length L as each hole 11 of the pipe main body 12 was formed in order to make the number of the holes 11 of Example 2 the same. Fifteen were used, and similarly, the heat generation amount of the heating element H was 500 W and the cooling air velocity was 2 m per second, and the resulting temperature difference was obtained by calculation. As a result, the temperature difference becomes 48.2K, and it can be seen that when three pipe bodies 12 are used as in Example 2, the temperature difference is reduced by 7K and the performance is improved by about 15%.

  As described above, in the heat pipe 10 of the cooler 1 of the present embodiment, the pipe body 12 is made of copper or a copper alloy, has a plurality of holes 11, and the working water W is sealed in the holes 11. As a result, heat can be efficiently transported in a minimum space to cool the heating element H. In particular, it has the communication parts 14 and 15, and each working water W in the liquid phase and the gas phase can be circulated through the different holes 11, so that heat can be transported more efficiently and the heating element H Can be cooled. Therefore, even if the wick is not provided inside the hole 11, heat can be efficiently transported, and this allows easy and low-cost manufacturing.

  In addition, in the said embodiment, although the pipe main body 12 was set as the structure which has the communication parts 14 and 15, it is not restricted to this, Each hole 11 is made to circulate the working water W inside independently. Also good. Moreover, although it shall be coat | covered with the coating | coated plate 13, it is not restricted to this, It is good also as what has the pipe main body 12 exposed, and connects the heat generating body H and the radiation fin 2 to the pipe main body 12 itself. .

  Moreover, in the said embodiment, although the pipe main body 12 shall have the five holes 11, it is not restricted to this, What is necessary is just to have at least 2 or more. Moreover, although the cross-sectional shape of each hole 11 is substantially elliptical, it is not limited thereto, and may be a perfect circle, or each hole 21 as in the pipe body 20 of the modification shown in FIG. May be formed in a rectangular shape, and the shape of the hole 21 only on the side of both edges 20a may be formed in a curved shape in accordance with the outer shape. In the above description, the cross-sectional areas of the holes are substantially equal to each other. However, the cross-sectional areas are not limited to this, and may be different in size. In order to more efficiently transport heat, a wick such as a groove or a net may be selectively provided in a part or the whole of the plurality of holes. Moreover, in the said embodiment, although the pipe main body 12 was formed in flat shape and the hole 11 shall be arranged in a line, it does not restrict to this. For example, the holes 22 may be arranged in a staggered manner as shown in FIG. 7, or the holes 23 may be arranged in an annular shape as shown in FIG. . By arranging them as described above, it is possible to make the heat transfer condition of each hole different, and to generate a pressure difference between the different holes in the same manner as described above, and to circulate efficiently for heat transport.

  Moreover, in the cooler 1 of the said embodiment, although the heat generating body H was provided in the one end part side of the heat pipe 10, and the radiation fin 2 used as a cooling means was provided in the other end part side, it is restricted to this. It is not a thing. As shown in the cooler 25 of the modified example of FIG. 9, the cooling fins 26 may be provided over the whole from one end to the other end. Even if it does in this way, since the heat generating body H is biased and provided in the one end part side, the temperature gradient has arisen from one end part to the other end part, and, thereby, the operation | movement inside the pipe main body 11 of the heat pipe 10 By circulating water, heat from the heating element H can be transported and cooled by the radiation fins 26.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 10 shows a second embodiment of the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  As shown in FIG. 10, the heat pipe 30 of this embodiment includes a plurality of pipe main bodies 31, headers 32 and 33 provided at one end and the other end of the pipe main body 31, and sealed inside the pipe main body 31. Working water (not shown). Here, the pipe body 31 is made of copper or a copper alloy as in the first embodiment, and a plurality of holes 34 are arranged in a line and formed in a flat shape as a whole, while having a communication portion. Each hole 34 is open at both ends. On the other hand, in the headers 32 and 33, communication holes 32a and 33a communicating with the holes 34 of the pipe bodies 31 are formed. That is, the hole 34 of each pipe body 31 is in a sealed state while communicating with the other holes 34 by the headers 32 and 33. The working water is sealed from an inlet 33 b provided in one header 33 in advance. Moreover, although it is abbreviate | omitted about the covering in this embodiment, it is good also as a structure provided with a covering, and it is good also as a structure which is not provided.

  In the heat pipe 30 of the present embodiment, the heat from the heating element H can be more effectively transported by providing a plurality of pipe main bodies 31 having a plurality of holes 34. Further, in the present embodiment, the working water existing in each hole 34 of each pipe body 31 passes through the headers 32, 33 at both ends, and the other hole 34 of the same pipe body 31, or the other pipe body 31. It can be circulated through the hole 34. That is, the working water that has become a gas phase due to heat from the heating element at one end of one hole 34 is moved to the other end side, and the other end is radiated to the radiation fins to cool and condense into a liquid phase. Water can be moved from the other end of the other hole 34 to one end through one header 33. For this reason, it can be prevented that the gas-phase working water hinders the circulation of the liquid-phase working water and does not circulate inside the one hole 34, thereby preventing the heat transport. It can be performed.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 11 shows a third embodiment of the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  As shown in FIG. 11, the cooler 40 of the present embodiment is a heat pipe 41, a plate 42 to which the heat pipe 41 is supported and to which the heating element H is connected, and a cooling means connected to the heat pipe 41. The heat dissipating fins 43 are provided. The plate 42 is made of, for example, aluminum. The heat pipe 41 has a pipe body 45 having a plurality of holes 44 and working water W sealed in the holes 44 of the pipe body 45. Each hole 44 of the pipe main body 45 is formed in an endless shape by being bent back and forth in a direction approaching and separating from the plate 42. Further, the working water W exists in the present embodiment in such a manner that the liquid phase and the gas phase are alternately switched inside each hole 44 of the pipe body 45.

  In the heat pipe 41 of the cooler 40 of the present embodiment, the liquid phase in the working water W inside the pipe body 45 is heated by the heat from the heating element H within a range in contact with the plate 42 on which the heating element H is provided. Evaporates and the pressure rises. On the other hand, in the range in which the radiation fins 43 are provided, the heat radiation W dissipated to the radiation fins 43 causes the water in the pipe main body 45 showing the gas phase to cool and condense, and the pressure decreases. Therefore, a pressure difference is generated between the range in which the heating element H is provided and the range in which the radiation fins 43 are provided, and the working water W that exists so that the liquid phase and the gas phase are alternately switched It will circulate in each hole 44 formed in endless form, and from this, the heat from the heat generating body H can be efficiently transported to the radiation fin 43, and can be cooled.

  In the present embodiment, the pipe main body 45 is arranged by being diffracted multiple times in the direction of approaching and separating from the plate 42, but is not limited thereto. For example, as shown in FIG. 12, a plurality of diffraction patterns may be arranged in a direction substantially parallel to the plate 42.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. 13 to 15 show a fourth embodiment of the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  As shown in FIGS. 13 and 14, the cooler 50 of the present embodiment includes a heat pipe 51, a plate 52 that supports the heat pipe 51 and is connected to the heating element H, and a cooling unit that is connected to the heat pipe 51. It is provided with the radiation fin 53 which is. The plate 52 is made of, for example, aluminum. The heat pipe 51 is a pipe body having a plurality of holes in the present embodiment, and a first pipe body 56 and a second pipe body 58 in which the holes 55 and 57 communicate with each other, and a first pipe body 56. And the working water W enclosed in the second pipe main body 58. The first pipe body 56 is embedded on the plate 52 so that the one surface 56a is exposed as the heat generating body H side. Both ends of each hole 55 of the first pipe body 56 are closed. In addition, a plurality of second pipe main bodies 58 are provided in the present embodiment, and are arranged so as to be arranged in the direction in which the holes 55 of the first pipe main body 56 are extended, and are erected substantially vertically on one surface 56a. Is connected. In each second pipe main body 58, each hole 57 corresponds to each hole 55 in the first pipe main body 56, communicates with the corresponding hole 55 at one end, and is closed at the other end. The heat radiation fins 53 are provided so as to be interposed between the plurality of second pipe bodies 58.

  In the heat pipe 51 of the cooler 50 of the present embodiment, when heat is generated from the heating element H, the heat is passed through the plate 52 and the first pipe body 56 to the inside of the hole 55 of the first pipe body 56. Will be transmitted to the working water W present in the tank. As a result, the working water W changes from the liquid phase to the gas phase by being heated and evaporated. The working water W that has become a gas phase flows into the hole 57 of the second pipe main body 58 provided with the radiation fins 52. Inside the second pipe main body 58, the heat of the working water W is transferred to the heat radiating fins 53 through the second pipe main body 58 to be dissipated, thereby cooling and condensing the liquid from the gas phase. It will change to a phase. Then, the working water W in the liquid phase flows through the same hole 57 to the first pipe body 56 side and circulates, thereby transporting the heat transmitted from the heating element H and radiating fins. 53 can dissipate heat and cool.

  Further, in the present embodiment, the heating element H side where the working water W exists as a liquid phase is divided into a plurality of spaces by the plurality of holes 55 of the first pipe body 56. For this reason, the working water W in the holes 55 of the respective first pipe bodies 56 is independently circulated between the holes 57 of the corresponding second pipe bodies 58 and performs heat transport. . FIG. 15 shows, for example, a state where the cooler 50 is mounted on a vehicle or the like and the cooler 50 is inclined according to the driving situation of the vehicle. FIG. 16 shows a heat pipe 60 as a comparative example in which two pipe bodies 61, 62 having the same capacity as the plurality of holes 55, 57 are combined as one hole 61a, 62a. As shown in FIG. 16, in the heat pipe 60 as a comparative example, if it is inclined, since the hole 61a in which the working water W exists as a liquid phase is formed as one, the working water W is inclined. It will be biased downward. For this reason, the area A60 that can be transported by receiving heat from the heating element H decreases depending on the range in which the working water W exists. On the other hand, as shown in FIG. 15, in the heat pipe 51 of the cooler 50 of the present embodiment, the working water W existing as the liquid phase is divided by the plurality of holes 55 of the first pipe body 56, and therefore Even if it inclines, it can maintain the state in which the working water W exists over the whole inclination direction only by deviating in inclination downward in each hole 55 as a whole. For this reason, even if the inclination state changes, the area A50 that can receive and transport heat from the heating element H can be kept substantially constant, and the heating element H can be cooled by stably transporting heat. it can.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

It is sectional drawing seen from the side which shows the outline | summary of the cooler of the 1st Embodiment of this invention. It is the cross section seen from the front which shows the detail of the heat pipe of the cooler of the 1st Embodiment of this invention. It is the cross section seen from the side which shows the detail of the heat pipe of the cooler of the 1st Embodiment of this invention. FIG. 3 is a cross-sectional view taken along a cutting line AA in FIG. 2. It is a graph which shows the relationship between the emitted-heat amount and heat resistance value in the heat pipe shown in Example 1 of this invention. It is sectional drawing of the heat pipe of the 1st modification of the 1st Embodiment of this invention. It is sectional drawing of the heat pipe of the 2nd modification of the 1st Embodiment of this invention. It is sectional drawing of the heat pipe of the 3rd modification of the 1st Embodiment of this invention. It is sectional drawing of the cooler of the 4th modification of the 1st Embodiment of this invention. It is a front view of the heat pipe of the cooler of the 2nd embodiment of the present invention. It is a front view of the cooler of a 3rd embodiment of the present invention. It is a front view of the cooler of the modification of the 3rd Embodiment of this invention. It is sectional drawing seen from the front of the cooler of the 4th Embodiment of this invention. It is sectional drawing seen from the side of the cooler of the 4th Embodiment of this invention. It is explanatory drawing explaining the state which inclined in the cooler of the 4th Embodiment of this invention. In the cooler of a comparative example, it is explanatory drawing explaining the state inclined like FIG.

Explanation of symbols

1, 25, 40, 50 Cooler 2, 26, 43, 53 Radiation fin (cooling means)
10, 30, 41, 45, 51 Heat pipe 11, 21, 22, 23, 34, 44, 55, 57 Hole 12, 20, 31 Pipe body 13 Cover plate (cover)
14, 15 Communication portion 32, 33 Header 56 First pipe body 58 Second pipe body H Heating element W Working water

Claims (8)

A pipe body made of copper or a copper alloy and having a plurality of holes to be sealed, and
A heat pipe comprising working water sealed inside the pipe body. The heat pipe according to claim 1,
The heat pipe according to claim 1, wherein the pipe body is formed with a communicating portion that communicates the holes in a sealed state at both ends of the hole. In the heat pipe according to claim 1 or claim 2,
With a plurality of the pipe bodies,
A heat pipe, wherein the holes are hermetically sealed by headers that are provided at both ends of the plurality of pipe bodies and communicate the holes of the pipe bodies. In the heat pipe according to any one of claims 1 to 3,
The heat pipe according to claim 1, wherein the pipe body is formed in a flat shape as a whole so that the plurality of holes are arranged in a line on substantially the same plane. In the heat pipe according to any one of claims 1 to 4,
A heat pipe comprising a covering body made of aluminum or an aluminum alloy that covers the pipe body and to which a heating element and a cooling means are connected. The heat pipe according to claim 1,
The said pipe main body has each said hole formed in endless shape, The heat pipe characterized by the above-mentioned. The heat pipe according to claim 1,
The pipe body includes a first pipe body disposed on the heating element side, and a second pipe body having one end connected to the first pipe body and a cooling means connected thereto. Heat pipe. The heat pipe according to any one of claims 1 to 7,
And a cooling means connected to the heat pipe.

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