JP2010060164A - Heat pipe type heat sink - Google Patents

Abstract

To provide a heat pipe heat sink capable of ensuring normal operation of a heat pipe even in a low temperature environment, exhibiting a high cooling capacity, and saving space.
A small-diameter pipe 12 having a heat dissipating fin 20 attached to an outer peripheral surface is disposed so as to extend in a vertical direction on one plane parallel to each other and inclined with respect to a horizontal plane. The lower end of the pipe 12 is connected to the header pipe 16 disposed in the heat receiving block 14 so that they can communicate with each other, while the upper ends of the plurality of small diameter pipes 12 are connected to the gas reservoir pipe 18. The small-diameter pipes 12 are configured so as to communicate with each other via the gas reservoir pipe 18 at the upper end portion, and the working liquid and the non-condensable gas are sealed inside the pipe 12 and the header pipe 16. The heat pipe type heat sink 10 was configured.
[Selection] Figure 1

Description

  The present invention relates to a heat pipe heat sink, and more particularly, to a heat pipe heat sink that can ensure normal operation in a low temperature environment.

  2. Description of the Related Art Conventionally, in power equipment, substation equipment, vehicle power supply devices, etc., a cooler for cooling large heat-generating components has been provided, and one of such coolers is a heat pipe heat sink. Can be mentioned. In such a heat pipe heat sink, an assembly in which a large number of radiating fins are integrally attached to the heat pipe is extended upward with respect to the heat receiving block installed in the heating element (cooled member). The heat generated in the heating element is transferred from the heating element to the heat receiving block, and the heat transferred to the heat receiving block is one end of the heat pipe (attached to the heat receiving block) By moving from the heat absorbing part side to the other end side (heat radiating part side) and further being released to the outside air through the heat radiating fins, heat is radiated or removed.

  By the way, in recent years, as a countermeasure against environmental problems, there are increasing cases of using water as a working fluid (working fluid) sealed in a heat pipe. However, when water is used as the working fluid, when used in a low temperature environment, that is, in an environment where the ambient temperature is 0 ° C. or less, the water that is the working fluid is the heat that is opposite to the heat receiving side. There is an inherent problem that the pipe is frozen at the upper end of the pipe and at the portion where the heat dissipating fins are provided, and as a result, it cannot function as a heat pipe.

  For this reason, in order to avoid such a problem, in Japanese Patent Application Laid-Open No. 7-190655 (Patent Document 1) and Japanese Patent Application Laid-Open No. 11-289039 (Patent Document 2), etc., an ordinary heat pipe that uses water as a working fluid. And a heat pipe heat sink that uses a variable conductance heat pipe (VCHP) in which a non-condensable gas is sealed together with a working fluid (pure water) in a heat pipe container has been proposed. . That is, in the heat pipe type heat sinks disclosed in Patent Document 1 and Patent Document 2, a normal heat pipe in which non-condensable gas is not sealed and a variable conductance heat pipe (VCHP) They are arranged in parallel to the block.

  According to the heat pipe type heat sink having such a configuration, when a heating element generates heat in a state where the ambient temperature is greatly lowered from 0 ° C., in a normal heat pipe, a working fluid that has been frozen ( (Pure water) melts and part of it evaporates and tries to move to the other end of the heat pipe. In VCHP, the frozen working fluid melts like the normal heat pipe described above. Part of it will evaporate, but since the non-condensable gas is enclosed in the VCHP container, water vapor with a low partial pressure cannot move to the other end on the upper side. is there. For this reason, it is possible to effectively prevent the working fluid from freezing at the portion of the heat dissipating fin, so that the original function of the heat pipe can be maintained even in a low temperature environment.

  However, in the heat pipe type heat sinks of Patent Documents 1 and 2, since VCHP and a normal heat pipe are used together, VCHP functions in a low temperature environment as described above, but a normal heat The pipe does not function, and the heat dissipation performance is low for the number of heat pipes installed relative to the heat sink. In addition, as described above, there is a difference in the operation of the working fluid in the heat pipe between the normal heat pipe and the VCHP, so it is optimal when used in a normal atmosphere other than a low temperature environment (winter). There is also a problem that it is difficult to make a simple heat radiation structure.

  Therefore, in order to solve such a newly caused problem, the present inventors previously disclosed a new heat pipe type heat sink configuration in Japanese Patent Laid-Open No. 2005-214565 (Patent Document 3). I made it. That is, it is composed of a long heat pipe, a heat receiving block attached to one end of the heat pipe on the heat absorption side, and a heat radiation fin attached to a heat radiation side portion of the heat pipe. In the heat pipe type heat sink, a variable conductance heat pipe is adopted as the heat pipe, and the heat pipe type heat sink has a structure in which the heat pipe type heat sink is arranged at an angle of 5 to 20 ° with respect to the horizontal plane. By adopting such a configuration, it is possible to provide a heat pipe heat sink that can secure a high cooling performance in a low-temperature environment and can narrow the installation space in the vertical direction. It will be.

  However, the heat pipe type heat sink disclosed in Patent Document 3 is used in a state where the heat pipe type heat sink is inclined at an angle of 5 to 20 ° with respect to a horizontal plane. In the case of use for a vehicle, a problem that a space that can be allowed as a heat radiating portion is limited is newly caused. That is, in recent years, in the heat sink for element cooling stored under the floor of a railway vehicle, further improvement in cooling capacity is desired in response to an increase in the heat generation amount of the element to be cooled. However, it has been difficult to simply increase the number of heat pipes due to the limited installation space under the floor of a railway vehicle. Even in the heat pipe heat sink disclosed in Patent Document 3, such a demand for high performance is not sufficiently met, and further improvement is demanded.

  On the other hand, in Japanese Patent Application Laid-Open No. 2004-125381 (Patent Document 4), the bottoms of a plurality of thin pipes are erected and joined to the side of a tank having a large cross-sectional area, and a refrigerant is sealed in the tank and the pipe. A heat pipe unit constructed by passing a plurality of fins through such a plurality of thin pipes, and a tank portion of such a heat pipe unit embedded in a metal base block, so-called a heat pipe heat sink with a header The heat pipe cooler that has been clarified.

  According to the heat pipe heat sink with a header (heat pipe cooler) configured as described above, it is possible to improve the cooling efficiency on the fin side by integrally joining multiple thin pipes using a tank Thus, the cooling efficiency of the entire heat sink can be improved. In addition, heat generated from semiconductor elements is transferred to a metal base block with good thermal conductivity, and is uniformly distributed in the base block so that it is dissipated through a large number of thin pipes. The structure of the apparatus is simple and easy to manufacture, and although it is small in size, the cooling performance can be increased.

  However, in such a heat pipe cooler, since the working liquid sealed inside the heat pipe is a refrigerant liquid such as water or fluorocarbon, the working liquid (water ) Is frozen, and the inherent function of the heat pipe cooler cannot be performed. In order to avoid this, if a non-condensable gas is sealed together with the hydraulic fluid to form a VCHP structure, when such a heat pipe cooler is used in a railway vehicle or the like, the vehicle tilts and the heat pipe If the cooler body also tilts, the refrigerant (working fluid) will be offset in the tank or pipe, and the non-condensable gas will be in the pipe on the side where the working fluid is offset. This causes a problem that it becomes insufficient and cannot function sufficiently as VCHP.

Japanese Unexamined Patent Publication No. 7-190655 Japanese Patent Application Laid-Open No. 11-289039 JP-A-2005-214565 JP 2004-125381 A

  Here, the present invention has been made in the background of such circumstances, and the problem to be solved is that it is possible to ensure the normal operation of the heat pipe even in a low temperature environment, An object of the present invention is to provide a heat pipe heat sink capable of saving space while exhibiting a high cooling capacity.

  In the present invention, in order to solve such a problem, a plurality of elongated pipe body portions each having a heat radiating fin attached to the outer peripheral surface are inclined with respect to a horizontal plane in a form parallel to each other. The pipe body portions are arranged so as to extend in the vertical direction on one plane, and the lower ends of the plurality of pipe body portions are connected to a pipe-shaped heat receiving header portion arranged in the heat receiving block. Each of the plurality of pipe main body portions is connected to a pipe-shaped gas reservoir portion, and the pipe main body portion is connected to the heat receiving header portion. It is configured to communicate with each other, and further, a working liquid and a non-condensable gas are sealed inside the pipe main body and the heat receiving header. The Topaipu heat sinks, is to its gist.

  In one of desirable aspects of the heat pipe heat sink according to the present invention, a recess extending in the horizontal direction is formed in the heat receiving block, and the heat receiving header portion is accommodated in the recess, and is closely fixed. Will be.

  Further, according to one of the preferred embodiments of the heat pipe type heat sink according to the present invention, the upper end of the pipe main body is connected to the lower part in the cross section of the gas reservoir, and the gas reservoir The hydraulic fluid in the pipe is guided into the pipe main body, and in another preferred embodiment, the upper end portion of the pipe main body is curved so as to rise upward, and the gas It will be connected with the lower part in the cross section of a reservoir part.

  Furthermore, in another desirable aspect of the heat pipe type heat sink according to the present invention, the plurality of pipe main body portions are vertically arranged on one plane inclined at an angle of 5 to 20 ° with respect to a horizontal plane. It will be arrange | positioned so that it may extend.

  Furthermore, in the present invention, there is provided a heat sink assembly in which a plurality of the heat pipe heat sinks described above are used, and the heat sinks are stacked and arranged in a state where the heat receiving blocks are stacked one above the other. This is the gist.

  And in such a heat pipe type heat sink according to the present invention, a plurality of elongate pipe body parts with radiating fins attached to the outer peripheral surface are arranged so as to be parallel to each other, and the plurality of pipe body parts The lower end of the pipe is connected to the pipe-shaped heat receiving header, while the upper end of the pipe main body is connected to the pipe-shaped gas reservoir, and the heat receiver header, the plurality of pipe main bodies and the gas reservoir are The heat receiving block is constructed so as to communicate with each other, and is a so-called header heat pipe having a structure in which a working liquid and a non-condensable gas are enclosed in the pipe main body and the heat receiving header. The heat transferred to the heat receiving block is uniformly dispersed in the heat receiving block, and the pipe-shaped heat receiving header portion arranged in the heat receiving block is connected to the pipe connected thereto. Heat is transferred to the main body portion via the working fluid, and further, heat is effectively dissipated via the heat radiation fins attached to the respective pipe main body portions, so that the heat dissipation performance can be effectively enhanced. It is. In addition, according to the structure of the heat pipe type heat sink, the heat dissipation performance of the heat sink can be improved by increasing the number of pipe main body units installed (arrangement density) in response to an increase in the heat generation amount of the heating element that performs cooling. It can be advantageously increased.

  In addition, according to the heat pipe heat sink according to the present invention, a so-called variable conductance heat pipe (VCHP) in which a working fluid (working fluid) and a non-condensable gas are sealed in the pipe main body, the heat receiving header, and the gas reservoir. Unlike the case of using only normal heat pipes that are not filled with non-condensable gas or the case of using normal heat pipes together, on the heat dissipation side of the working fluid in a low-temperature environment. It is possible to reliably prevent freezing. For this reason, even in such a low temperature environment, the function of the heat pipe can be demonstrated to an advantage, and the cooling capacity or the cooling capacity of the heat pipe heat sink is highly secured with a small number of installed heat pipes. It will be possible to do.

  Further, the plurality of pipe main body portions are communicated with the pipe-shaped heat receiving header portion at the lower end side which is one end portion, and the upper end side which is the other end portion is communicated with the pipe-shaped gas reservoir portion. Thus, since the entire structure is configured to communicate with each other so as to form one circuit, even when the main body of the heat pipe type heat sink is inclined, the communicated gas reservoir portion is provided. Since the non-condensable gas can move to each other, the pressure in each heat pipe (pipe body) can be kept the same, and the operating temperature range of each heat pipe becomes the same, As a result, the heat radiation in each heat pipe can be made uniform, and the heat radiation performance can be advantageously improved. That is, the non-condensable gas is partly radiated on the heat pipe due to the uneven distribution of the working fluid when the heat sink is inclined, which occurs in the heat pipe type heat sink having a conventional configuration. It is possible to effectively solve the problem that the number of fins contributing to heat radiation decreases due to uneven distribution in the (pipe main body portion), and a predetermined heat radiation performance cannot be obtained.

  In addition, since each heat pipe (pipe body part) is connected by such a pipe-shaped gas reservoir, it is not necessary to form a gas reservoir in each heat pipe. The area occupied by the gas reservoir can be reduced, and as a result, the space saving of the heat pipe type heat sink can be realized.

  In addition, when a heat pipe type heat sink is used for a railway vehicle, it is necessary to take measures against vibration (resonance) of the heat sink due to the vibration of the vehicle, but the gas reservoir side of each heat pipe is not communicated as in the prior art. In some cases, it is necessary to fix the gas reservoir as a countermeasure against vibration, and the size of the heat pipe heat sink increases due to the fixing parts. Induced. However, in the heat pipe type heat sink configured in accordance with the present invention, the gas reservoir is formed by the pipe-shaped gas reservoir, and each heat pipe (pipe main body) is fixed. No extra parts are required, so that space saving can be realized more advantageously.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows an embodiment of a heat pipe heat sink according to the present invention, in the form of a side view, and FIG. 2 shows the heat pipe heat sink in FIG. 1 viewed from the direction of arrow A in the figure. Are respectively schematically shown. As is apparent from these drawings, the heat pipe heat sink 10 has a plurality of small-diameter pipes 12 as a long and narrow pipe body portion having a plurality of heat radiating fins 20 attached to the outer peripheral surface. ) Are connected to a header pipe 16 serving as a heat receiving header portion disposed in the heat receiving block 14, and are connected to a gas reservoir pipe 18 forming a gas reservoir portion at the other end (upper end). The plurality of small-diameter pipes 12, the header pipe 16, and the gas reservoir pipe 18 are configured to communicate with each other. Further, water and non-condensable gas as working fluid are sealed inside the small-diameter pipe 12, the header pipe 16 and the gas reservoir pipe 18 which are communicated in this way.

  More specifically, a plurality of (in this case, 14) small-diameter pipes 12 constituted by elongated pipes are arranged on a plane in parallel with each other at a predetermined interval. (See FIG. 2). And the header pipe 16 as a heat receiving header part in which the lower end part used as one edge part of the some small diameter pipe 12 arranged in that way was made larger diameter than the small diameter pipe 12, and each inside is connected. Further, the upper end portion which is the other end portion is connected to the gas reservoir pipe 18 as the gas reservoir portion so that the inside of each of the gas reservoir pipes 18 communicates. As a result, as shown in the cross-sectional views of FIGS. 3 (a) and 3 (b), these three types of pipes are in communication with each other, and the inside is sealed so as to form one circulation circuit. The heat pipe 22 is formed. The heat pipe 22 is filled with a predetermined amount of hydraulic fluid (water) and a predetermined amount of noncondensable gas, so that a so-called variable conductance heat pipe ( VCHP).

  In addition, as a hydraulic fluid enclosed in the heat pipe 22 as mentioned above, water will be employ | adopted suitably from a viewpoint that it is kind to an environment and is excellent also in the transport performance of heat. On the other hand, the non-condensable gas is not particularly limited as long as it is a gas that does not condense in the use environment, and a conventionally known non-condensable gas is appropriately selected and used, for example, Nitrogen gas, argon gas, or the like can be used.

  Further, the material of the heat pipe 22, that is, the material of the small-diameter pipe 12, the header pipe 16, and the gas reservoir pipe 18 is not particularly limited. Materials such as copper, aluminum, and alloys thereof are appropriately selected and used. Here, the header pipe 16 has a larger diameter than the small-diameter pipe 12, thereby increasing the heat receiving area between the header pipe 16 and the heat receiving block 14, and even when the heat load is large, the heat receiving block 14 is effectively obtained. However, when the heat load is small, the diameter of the header pipe 16 does not necessarily have to be larger than that of the small-diameter pipe 12, and the small-diameter pipe Of course, it is possible to have the same diameter.

  And the outer peripheral surface of the predetermined length part of the some small diameter pipe 12 used as the thermal radiation part of such a heat pipe 22 is formed with the material excellent in heat conductivity, for example, aluminum, or its alloy similarly to the past. A plurality of radiating fins 20 having a thin rectangular plate shape are arranged at predetermined intervals in the longitudinal direction of the small-diameter pipe 12, and the surface of the radiating fin 20 and the longitudinal direction of the plurality of small-diameter pipes 12 are arranged. In the state where the angle formed is a right angle, it is fixedly attached as in the conventional case.

  On the other hand, the header pipe 16 that is the heat receiving header portion of the heat pipe 22 has a surface on which the heating element 24 is attached to the heat receiving block 14 formed of a material having excellent thermal conductivity, similar to the conventional one. Are accommodated and fitted in a recess provided on the opposite surface and having a shape corresponding to the shape of the header pipe 16, so that the heat receiving block 14 and the header pipe 16 are firmly fixed. Here, with respect to one heat receiving block 14, four sets of heat pipes 22 are parallel to each other, and the planes on which the small diameter pipes 12 constituting each heat pipe 22 are arranged are parallel to each other. The heat pipe type heat sink 10 is fixed in a state where it is inclined at a predetermined angle (α) with respect to the horizontal plane in the use state, the header pipe 16 side is the lower side of the inclined heat pipe 22 and the gas reservoir pipe 18 side is the upper side. As a result, the heat pipe heat sink 10 is configured.

  The inclination angle (α) between the plane on which the plurality of small-diameter pipes 12 constituting the heat pipe 22 are arranged and the horizontal plane is desirably in the range of 5 to 20 °. By setting the inclination angle as described above, the working fluid can be recirculated favorably in the heat pipe 22, and the non-condensable property can be obtained in the small-diameter pipe 12 portion and the gas reservoir pipe 18 portion serving as a heat radiating portion in the heat pipe 22. It becomes possible to collect gas effectively, and therefore, the heat radiation performance (cooling performance) of the heat pipe heat sink 10 can be sufficiently exhibited.

  In the heat pipe heat sink 10 configured in accordance with the present invention as described above, the heat transferred from the heating element 24 (electronic component) to the heat receiving block 14 is uniformly distributed in the heat receiving block 14 and the dispersion is performed. The transferred heat is transferred from the heat receiving block 14 to the heat pipe 22, that is, the header pipe 14 tightly fixed to the heat receiving block 14 from the heat receiving block 14, and a plurality of small diameter pipes 12 connected to the header pipe 14. Therefore, it is possible to effectively radiate heat from the plurality of radiating fins 20 attached to the outer peripheral surface of the small-diameter pipe 12.

  Furthermore, since the heat pipe 22 constituting the heat pipe heat sink 10 is a variable conductance heat pipe (VCHP), even when used in a low temperature environment, the heat pipe 22 is sealed together with the working fluid. Due to the presence of the non-condensable gas, the working fluid can be advantageously prevented from freezing in the small-diameter pipe 12 that is the heat radiating portion of the heat pipe 22, and thus, even in a low temperature environment, the heat pipe 22 can be prevented. Thus, the heat dissipation performance of the heat pipe heat sink 10 can be more effectively exhibited. In this way, even in a low temperature environment, the heat pipe function can be advantageously demonstrated, so the heat pipe heat sink heat dissipation capability in a low temperature environment can be achieved with a small number of installed heat pipes. It can be secured at a high level.

  Further, a gas reservoir pipe 18 serving as a gas reservoir for non-condensable gas is joined to the upper ends of the plurality of small-diameter pipes 12 forming the pipe main body of the heat pipe 22 of variable conductance type. By being generalized, it is not necessary to form a gas reservoir in each of the small-diameter pipes 12, and there is an advantage that the space saving of the heat pipe heat sink 10 can be advantageously measured.

  Further, even when the heat pipe heat sink 10 is inclined, the non-condensable gases can move to each other through the gas reservoir pipe 18 into the small diameter pipes 12. This makes it possible to make the heat radiation uniform and to advantageously improve the heat radiation performance of the heat pipe heat sink 10 as a whole.

  That is, as shown in FIG. 5A, in the configuration in which the gas reservoirs of the respective small diameter pipes 12 are not communicated, when the hydraulic fluid 26 in the header pipe 16 is shifted to one side due to the inclination, Since the hydraulic fluid 26 enters the small-diameter pipe 12 on the offset side, the non-condensable gas in the small-diameter pipe 12 becomes insufficient, and there is a problem in that the heat dissipation performance varies from pipe to pipe. is there. On the other hand, according to the configuration of FIG. 5B configured according to the present invention, even when the hydraulic fluid 26 in the header pipe 16 is offset, the gas reservoir pipe 18 above the small-diameter pipe 12 Since the non-condensable gas moves into the small-diameter pipe 12, the shortage of the non-condensable gas is not caused. Here, in FIGS. 5 (a) and 5 (b), in order to facilitate understanding of the state where the working fluid in the heat pipe is offset when the heat pipe type heat sink is inclined, the header pipe is used. And a small-diameter pipe only (in the example of the present invention, further includes a gas reservoir pipe), and among the plurality of small-diameter pipes connected to the header pipe, both ends in the length direction of the header pipe Only those connected to the parts are shown, and the small-diameter pipe provided between them is omitted.

  As described above, according to the heat pipe heat sink 10 having the structure according to the present invention, the heat pipe 22 can be used even in a low temperature environment where the working fluid freezes or in a situation where the main body is inclined. As a result, it is possible to ensure a normal operation and to exhibit a high cooling capacity and to advantageously save space.

  As described above, one of the representative embodiments of the present invention has been described in detail. However, this is merely an example, and the present invention is not limited by the specific description according to such an embodiment. It should be understood that this is not to be construed as limiting.

  For example, the number of the plurality of small-diameter pipes 12 constituting the heat pipe 22 is not limited to the 14 illustrated, but the heat dissipation performance (cooling performance) required for the heat pipe heat sink 10 and the heat pipe heat sink 10 An appropriate number can be selected according to the size and the like.

  Further, in the above-described embodiment, the header pipe 16 that is the heat receiving header portion of the heat pipe 22 is accommodated in the recess formed in the heat receiving block 14 and is closely fixed thereto. For example, the header pipe 16 may be brazed to the surface of the heat receiving block 14 and fixed.

  Further, in such an embodiment, the small diameter pipe 12 and the gas reservoir pipe 18 are connected to each other with a small diameter with respect to the side portion in the cross section of the gas reservoir pipe 18 as shown in FIG. 1 and FIG. The pipes 12 are attached and communicated with each other. In addition to such a connection form, for example, as shown in FIG. 4A, the lower part in the cross section of the gas reservoir pipe 18 is used. The end portion of the small-diameter pipe 12 is bent so as to rise upward as shown in FIG. 4B, and the end portion is shown in FIG. 4A. Similarly to the above, it may be connected to the lower part of the gas reservoir pipe 18. In this way, by connecting the gas reservoir pipe 18 so as to be higher than the small-diameter pipe 12, there is no possibility that the working fluid is accumulated in the gas reservoir pipe 18.

  Furthermore, the size (diameter) of the gas reservoir pipe 18 can be large or small depending on the environment in which the heat pipe heat sink 10 is used. That is, this is appropriately selected according to the volume of the non-condensable gas sealed in the heat pipe 22. For example, in an environment where the volume of the non-condensable gas can be reduced, as shown in FIG. 4C, the diameter of the attachment portion of the small-diameter pipe 12 with respect to the gas reservoir pipe 18 is reduced, and the gas reservoir pipe 18 attached thereto. It is also possible to make a structure with a smaller diameter.

  In addition, in the heat pipe type heat sink 10 of the above-described embodiment, the heat receiving blocks 14 are stacked one above the other and stacked so that the heat sinks 10 are in contact with the heating elements using a plurality of the heat sinks. Therefore, it is advantageously used as a heat sink assembly. For example, in the heat pipe heat sink 10 shown in FIG. 1, the heat receiving block 14 is vertically divided into four parts, separated for each header pipe 16 placement site, and the heat pipe 22 is connected to each header pipe 16. As a structural unit, it is an assembly of a structure in which it is stacked up and down. As described above, by using a combination of a plurality of heat pipe heat sinks 10, it is effective regardless of the case where a large heat sink cannot be adopted due to the limitation of the heat sink mounting space or the shape of the heating element to be cooled. Thus, the heating element (electronic component) can be cooled.

  In addition, although not listed one by one, the present invention is implemented in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that any one of them falls within the scope of the present invention without departing from the spirit of the invention.

It is side surface explanatory drawing which shows an example of the heat pipe type heat sink according to this invention. In the heat pipe type heat sink shown in FIG. 1, the heat receiving header and the lowermost heat pipe attached thereto are in a direction perpendicular to the plane in which the small diameter pipes constituting the heat pipe are arranged. It is explanatory drawing which shows the state seen from the arrow A direction. FIG. 2 is a cross-sectional explanatory view of the heat pipe type heat sink shown in FIG. 1, where (a) shows a cross-sectional explanatory view along BB in FIG. 1, and (b) shows a CC cross-sectional explanatory view in FIG. Show. It is a fragmentary sectional view showing another example of a connection part of a small diameter pipe and a gas reservoir pipe in a heat pipe type heat sink according to the present invention, and (a), (b) and (c) show different connection structures, respectively. ing. It is perspective explanatory drawing which shows the mode of a movement of the hydraulic fluid and noncondensable gas in a heat pipe when a variable conductance heat pipe type heat sink inclines, Comprising: (a) is a structure without a gas reservoir pipe (B) shows the case of the configuration according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Heat pipe type heat sink 12 Small diameter pipe 14 Heat receiving block 16 Header pipe 18 Gas reservoir pipe 20 Radiation fin 22 Heat pipe 24 Heating element

Claims (6)

  A plurality of elongate pipe main body portions each having a heat radiating fin attached to the outer peripheral surface are arranged so as to extend in a vertical direction on one plane inclined in relation to a horizontal plane in a form parallel to each other. The lower end of the pipe main body portion is connected to a pipe-shaped heat receiving header portion disposed in the heat receiving block so that the pipe main body portions are respectively connected to the heat receiving header portion, while the plurality of pipes The upper end of the main body is connected to a pipe-shaped gas reservoir, and the pipe main body is configured to be communicated with each other through the gas reservoir even at the upper end. A heat pipe type heat sink characterized by enclosing a working fluid and a non-condensable gas inside a heat receiving header portion.   2. The heat pipe heat sink according to claim 1, wherein a recess extending in a horizontal direction is formed in the heat receiving block, and the heat receiving header portion is accommodated and fixed in close contact with the recess.   The upper end of the pipe main body is connected to a lower portion of a cross section of the gas reservoir, and the working fluid in the gas reservoir is guided into the pipe main body. 2. A heat pipe heat sink according to 2.   The upper end part of the said pipe main-body part is curved so that it may stand up, and it is connected with respect to the lower part in the cross section of the said gas reservoir part. Heat pipe heat sink.   The plurality of pipe main body portions are arranged so as to extend in a vertical direction on one plane inclined at an angle of 5 to 20 ° with respect to a horizontal plane. Heat pipe type heat sink described in 1. A plurality of the heat pipe heat sinks according to any one of claims 1 to 5, wherein the heat sinks are stacked and arranged in a state where the heat receiving blocks are stacked one above the other. A heat sink assembly characterized.

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