JP2007218439A - Fixing method of heat pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing method of a heat pipe capable of reducing contact heat resistance by improving and stabilizing adhesiveness of a heat receiving/radiating member and the heat pipe, easily inserting the heat pipe into a mounting groove, and free from restriction on designing a fixing position of the heat pipe to the heat receiving/radiating member, in fixing the heat pipe in the mounting groove formed on the heat receiving/radiating member. <P>SOLUTION: The mounting groove 4 formed on the heat receiving/radiating member 2 has the U-shape, the heat pipe 6 stored in the mounting groove 4 is pressed and deformed by a press die 10 from an upper part toward a groove bottom portion, so that it is closely kept into contact with an inner face of the groove bottom portion, and further both side parts (rising walls 8, 8) of the mounting groove 4 are pressed from the upper part by the press die 10 to deform both side parts to a groove side, thus the heat pipe 6 is fixed to the heat receiving/radiating member 2 in a state of being wrapped by both side parts. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of fixing a heat pipe and a heat receiving / radiating member in close contact with each other, and in particular, by pressing (crushing) a part of the heat pipe and the heat receiving / radiating member, It is related with the fixing method of the heat pipe which makes it possible to improve contact | adhesion property and to reduce a contact thermal resistance and to perform attachment easily.

  Conventionally, a so-called heat pipe type heat sink, in which a heat pipe is attached to a heat receiving and radiating member, has been used as one of heat sinks used for cooling various electronic components in power equipment, substation equipment, vehicle power supply devices, etc. It has been. Such a heat pipe type heat sink is formed by thermally connecting a heat radiating member having a large number of heat radiating fins and a heat receiving block installed on a heating element (a member to be cooled) with a heat pipe. The heat generated in the heat generating element is transmitted from the heat generating element to the heat receiving block, and the heat transmitted to the heat receiving block is one end of the heat pipe attached to the heat receiving block (the heat absorbing part side). ) To the other end side (heat radiating part side) and released into the outside air through the heat radiating fins, thereby radiating heat or removing heat.

  By the way, in such a heat pipe type heat sink, various methods have conventionally been adopted as a method of fixing the heat pipe to the heat receiving and radiating member. For example, by providing a groove in the heat receiving and radiating member and inserting a heat pipe into the groove, and applying or filling an adhesive in the gap between the heat pipe and the groove and fixing, or a flat plate of the heat radiating and receiving member A method has been used in which a heat pipe is placed on the upper surface of the shaped portion and the vicinity of the contact portion between the heat pipe and the heat receiving and radiating member is fixed with solder. However, in such a mounting method of the heat pipe and the heat receiving and radiating member, it is easy to attach the heat pipe to the heat receiving and radiating member, but when some external force is applied to the heat pipe, There is a possibility that the heat pipe may fall off from the heat receiving and radiating member when the adhesive effect becomes insufficient due to deterioration of the adhesive or the like.

  Therefore, as an attachment method for solving such a problem, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 2000-154981), a predetermined length portion of the heat pipe is used as a heat radiating / receiving member made of an aluminum die cast product. When attaching, the receiving and radiating member has a bottom shape corresponding to the outer shape of the heat pipe, and at least one of the side wall portions is provided with a receiving groove formed as a rising wall having a ridge shape, While the predetermined length portion of the heat pipe is accommodated, the rising wall is plastically deformed by caulking so that the peripheral surface of the heat pipe extends over the predetermined length portion and at least half of its circumference. The fixing structure of the heat pipe fixed in such a manner is clarified.

  As another attachment method, in Patent Document 2 (Japanese Patent Laid-Open No. 10-79586), an insertion groove provided in a part of the heat receiving portion is provided on the upper portion of the insertion groove and extending along the longitudinal direction. A pipe fixing part is formed so that the front cross-sectional shape has a substantially bag shape, and one end of the heat pipe is inserted and disposed in the heat pipe insertion groove, and then the heat pipe fixing part is pressed. As a result, the heat receiving portion structure of the heat radiating device in which the heat receiving portion and the heat pipe are joined is clarified.

  However, in these heat pipe attachment methods, for example, in Patent Document 1, only the heat receiving / radiating member, that is, only the rising wall portion of the housing groove provided in the heat receiving / radiating member is plastically deformed by caulking, Since the heat pipe is fixed to the heat receiving and radiating member so as to be in close contact with the circumferential surface of the heat pipe more than half, the heat pipe itself is hardly deformed during the caulking process, and the heat pipe There was a possibility that a gap might be formed between the outer peripheral surface of the pipe and the inner peripheral surface of the housing groove. That is, normally, the housing groove provided in the heat receiving and radiating member has an appropriate dimensional difference between the inner diameter of the housing groove and the outer diameter of the heat pipe so that the heat pipe can be easily inserted into the groove. Therefore, there is a problem that it is difficult to absorb such a gap by caulking (pressing) and to make the heat pipe and the heat receiving / receiving member sufficiently adhere to each other, and it is not sufficient to reduce the contact thermal resistance. It was something to do.

  On the other hand, even in the heat pipe mounting structure disclosed in Patent Document 2, when the heat pipe fixing portion (bag-like protrusion) provided in the upper portion of the heat pipe insertion groove is pressed, the bag shape Since the heat pipe exposed from the gap between the protrusions is not pressed, a part of the heat pipe protrudes from the gap, and there is a dimensional difference (clearance) between the heat pipe and the insertion groove. When it becomes larger (for example, when using a heat pipe and heat receiving / radiating member formed of an aluminum extruded material having a relatively large dimensional tolerance range), the inner surface of the insertion groove and heat There is a problem that a gap is formed between the outer peripheral surface of the pipe and the heat pipe and the heat receiving and radiating member cannot be sufficiently adhered to each other.

  Furthermore, since the groove for inserting the heat pipe provided in such a heat receiving and radiating member has a structure like a bag formed by forming a protrusion on the heat pipe insertion portion, It is necessary to perform additional machining in advance on the heat pipe insertion groove formed by cutting or the like to form a projection for forming such a bag shape, and thus the manufacturability deteriorates. Such problems were inherent. In addition, since the upper part of the heat pipe mounting groove is narrowed by such a bag-like protrusion, in order to insert the heat pipe into the heat pipe mounting groove, the side surface of the heat receiving and radiating member (heat pipe insertion groove) The heat pipe must be inserted from the side of the length direction), workability deteriorates, and when the insertion groove is bent in the middle, the heat pipe can be inserted to the back of the groove Because it was not possible, there was a risk of design limitations.

JP 2000-154981 A Japanese Patent Laid-Open No. 10-79586

  Here, the present invention has been made in the background of such circumstances, and the problem to be solved is that the heat pipe is accommodated and fixed in the mounting groove provided in the heat receiving and radiating member. In this case, the adhesiveness between the heat pipe and the heat receiving and radiating member is improved and stabilized, advantageously reducing the contact thermal resistance, facilitating insertion into the mounting groove of the heat pipe, and heat to the heat receiving and radiating member. It is an object of the present invention to provide a method for fixing a heat pipe that is not limited in design of the fixing position of the pipe.

  In the present invention, in order to solve the above-described problems, a method is adopted in which a predetermined length portion of the heat pipe is accommodated and fixed in a mounting groove provided in the heat receiving and radiating member, and fixed. By making the mounting groove of the heat radiating member into a U-shape and pressing and deforming the heat pipe portion accommodated in the U-shaped mounting groove from above to the groove bottom, at least on the inner surface of the groove bottom On the other hand, by pressing both side portions of the mounting groove of the heat receiving and radiating member from above, the both side portions are deformed to the groove side, and the heat pipe is wrapped at both side portions of the mounting groove, The gist of the fixing method of the heat pipe is to fix the heat pipe to the heat receiving and radiating member.

  According to one of the desirable embodiments of the heat pipe fixing method according to the present invention, the pressing operation on both sides of the mounting groove of the heat receiving and radiating member starts simultaneously with or behind the press deformation operation on the heat pipe. Will be.

  Further, in the present invention, it is also another aspect of the desirable aspect that both side portions of the mounting groove of the heat receiving and radiating member are constituted by rising walls having a predetermined width extending along the mounting groove. It is said.

  Further, according to another different preferred embodiment according to the present invention, a central pressing part for pressing the heat pipe, and mounting grooves of the heat receiving and radiating member respectively positioned on both sides of the central pressing part A press die in which both side pressing portions for pressing both side portions of the above are provided in a stepped shape is used for deformation of the heat pipe and both side portions.

  Furthermore, according to another preferred embodiment of the present invention, a central pressing portion for pressing the heat pipe, and the rising wall are positioned on both sides of the central pressing portion, respectively The heat pipe and both side portions are deformed by using a press die having both side curved pressing portions that are bent and deformed, and according to another desirable aspect, the heat pipe is pressed. A press die comprising a central pressing portion for positioning and a both-side cutting edge portion that is positioned on both sides of the central pressing portion and that cuts in both side portions of the mounting groove and deforms the both side portions to the groove side. The heat pipe and both side portions are deformed by using.

  Thus, according to the fixing method of the heat pipe according to the present invention, when the predetermined length portion of the heat pipe is accommodated and fixed in the mounting groove provided in the heat receiving and radiating member, the sectional shape of the mounting groove is fixed. When the heat pipe is inserted into such a mounting groove, the heat pipe can be inserted from above the mounting groove (opening side of the groove). Therefore, the workability of mounting the heat pipe to the heat receiving / dissipating member can be advantageously improved, and the mounting groove on the surface of the heat receiving / dissipating member is bent at an arbitrary angle or has a curved shape. Even if it is made, a heat pipe having a corresponding shape can be easily inserted from the upper side of such a mounting groove, so that there is no restriction on the design of the cooling device. It has the advantage of say.

  In addition, the heat pipe accommodated in the mounting groove having such a U-shaped cross section is pressed from the upper side (the upper side of the mounting groove) toward the groove bottom to be deformed. Thus, the outer peripheral surface of the heat pipe can be effectively brought into close contact with at least the inner surface of the bottom of the mounting groove.

  Then, along with such press processing on the heat pipe, by pressing both side portions of the mounting groove of the heat receiving and radiating member from above, the heat pipe is turned to both side portions of the mounting groove toward the inside of the groove. Since the heat pipe is fixed to the heat receiving and radiating member by deforming it so as to wrap it, the gap formed between the outer peripheral surface of the heat pipe and the inner surface of the mounting groove is reduced and they are in wide contact with each other. It is possible to make contact in terms of area and more closely contact, so that the contact thermal resistance between the heat receiving and radiating member and the heat pipe can be effectively reduced.

  By the way, according to one of the desirable embodiments of the heat pipe fixing method according to the present invention, the pressing operation on both sides of the mounting groove provided in the heat receiving and radiating member is performed simultaneously with the press deformation operation on the heat pipe inserted into the mounting groove. Alternatively, by starting at a later time, by pressing the top of the heat pipe, the heat pipe is brought into close contact with the lower part (bottom) of the mounting groove, and at the same time, it is spread laterally and also on the side. It will be in close contact. And, in such a close contact state, both side portions of the mounting groove are pressed and deformed, and at the same time, the deformed portion is in close contact with the heat pipe, and at the same time, the heat pipe is moved from the upper portion to the lower portion (bottom portion) of the groove. As a result, a pressing force is exerted, so that the adhesion between the heat pipe and the heat receiving and radiating member can be advantageously improved.

  Further, according to one of the preferred embodiments of the heat pipe fixing method according to the present invention, by forming rising walls with a predetermined width extending along the mounting groove on both sides of the mounting groove provided in the heat receiving and radiating member, When the press operation is performed on such both side portions, the rising wall portion is deformed toward the inner side of the mounting groove, and the heat pipe accommodated in the mounting groove is more effectively removed from the upper surface. In addition to the pressing, the adhesion between the heat pipe and the mounting groove can be improved.

  In addition, according to one of the desirable aspects of the present invention, the press dies used for deformation of both sides of the heat pipe and the mounting groove are respectively positioned on the central pressing portion for pressing the heat pipe and on both sides of the central pressing portion. The both side pressing portions for pressing the both side portions of the mounting groove of the heat receiving / dissipating member are formed in a stepped shape, or according to another desirable aspect of the present invention, A central pressing part for pressing the heat pipe, and a double-sided curved pressing part that is positioned on both sides of the central pressing part and that bends and deforms the rising walls formed on both sides of the mounting groove toward the mounting groove. Or a central pressing part for pressing the heat pipe, on both sides of the central pressing part, according to one of the other desirable embodiments of the present invention. The heat pipe and both side portions are pressed by forming a shape with both side cutting edges that are positioned and cut into both side portions of the mounting groove and deforming the both side portions to the inside of the mounting groove. In operation, deformation of both the heat pipe and both sides of the mounting groove is effectively performed.

  Thus, according to the fixing method of the heat pipe according to the present invention, by pressing near the upper part of the heat pipe insertion groove formed in the heat receiving and radiating member, the upper part of the groove is deformed so as to wrap the heat pipe. The heat pipe outer peripheral surface and the inner surface of the mounting groove, that is, the adhesion between the heat pipe and the heat receiving and radiating member can be improved, the contact heat resistance can be advantageously reduced, and the heat pipe can be stably received and radiated. Therefore, it is possible to effectively prevent the heat pipe from falling off.

  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 schematically shows a heat receiving and radiating member and a heat pipe fixed by an embodiment of a heat pipe fixing method according to the present invention in the form of a cross-sectional view in which the mounting portion is enlarged. Yes. In FIG. 1, the heat pipe 6 is accommodated in the mounting groove 4 provided in the heat receiving and radiating member 2, and the heat pipe 6 and the rising walls 8, 8 provided on both sides of the mounting groove 4 are The heat pipe 6 is fixed to the heat receiving and radiating member 2 by being pressed and deformed by the press die 10.

  More specifically, the heat receiving and radiating member 2 is made of hot extrusion, hot forging, press using a metal material having good thermal conductivity such as aluminum (including aluminum alloy) and copper (including copper alloy). These are formed by various known manufacturing methods such as die casting, and a mounting groove 4 is formed on the surface thereof. Further, rising walls 8 and 8 having a predetermined width are formed on both sides of the mounting groove 4 so as to extend in the length direction of the groove and to be higher than the upper surface of the heat receiving and radiating member 2 by a predetermined height. . The mounting groove 4 is formed by performing cutting or the like on the heat receiving and radiating member 2 formed in the block shape or the plate shape by the above-described manufacturing method. It is of course possible to form the shape directly with the mounting groove 4 when forming the shape.

  Then, the heat pipe 6 formed of a metal material such as aluminum or copper (including each alloy) is inserted into the mounting groove 4 formed in the heat receiving and radiating member 2 like the receiving and radiating member 2. After the arrangement, the heat pipe 6 and the rising walls 8 and 8 of the heat receiving and radiating member 2 are connected to a press device (not shown) and pressed by a press die 10 in which the press surface 12 is a flat surface. And they are deformed and fixed. At this time, the inner portion 14 of the rising wall 8 deformed by the press die 10 is deformed so as to cover the inside of the mounting groove 4, that is, to cover the upper surface of the heat pipe 6. However, it is made not to detach easily from the inside of the mounting groove 4.

  By the way, the operation of attaching the heat pipe 6 to the heat receiving and radiating member 2 according to the present invention is performed according to a procedure as shown in FIG. 2, for example. That is, first, as shown in FIG. 2 (a), the heat receiving and radiating member 2 is formed with a mounting groove 4 having a U-shaped cross section when cut by a plane perpendicular to the length direction on the upper surface thereof. Prepare. On both side portions of the mounting groove 4, rising walls 8 having a predetermined width are formed continuously in the length direction, and the cross-section thereof is rectangular here. Then, a predetermined length portion of the heat pipe 6 having an outer diameter corresponding to the groove width is accommodated and disposed in the mounting groove 4. The outer diameter of the heat pipe 6 is made smaller than the width of the U-shaped attachment groove 4, and when inserted into the attachment groove 4, the top portion of the heat pipe 6 is formed on the rising wall 8. The size is such that it protrudes to some extent from the top surface.

  Next, as shown in FIG. 2 (b), the press die 10 that is moved up and down by a predetermined pressing device is pushed down toward the heat receiving and radiating member 2. At this time, since the top of the heat pipe 6 protrudes from the upper surface of the rising wall 8, the heat pipe 6 comes into contact with the press surface 12 earlier than the rising wall 8 and starts to be pressed. At this time, the lower surface of the heat pipe 6 is brought into close contact with the bottom surface of the mounting groove 4, and since the shape is hollow, the heat pipe 6 is deformed into an elliptical cross-sectional shape in the lateral direction without restriction. Here, the height of the rising wall 8 is set such that the top of the heat pipe 6 accommodated in the mounting groove 4 protrudes from the upper surface of the rising wall 8, so that the heat pipe 6 is higher than the rising wall 8. The press mold 10 is first pressed (pressed), but it is of course possible to adjust the outer diameter of the heat pipe 6 and the height of the rising wall 8 so that they are simultaneously pressed. Is possible. However, in order to increase the degree of adhesion between the heat pipe 6 and the heat receiving and radiating member 2, it is desirable that the deformation of the heat pipe 6 be performed before the deformation of the rising wall 8.

  Further, by subsequently pressing down the press die 10, the heat pipe 6 is deformed, the lower surface (press surface 12) of the press die 10 and the rising walls 8 and 8 are brought into contact with each other, and the heat pipe 6 and the rising walls 8 and 8 are pressed (FIG. 2C). At this time, the rising wall 8 is deformed in the thickness direction of the wall (left and right in the figure) by being pressed by the lower surface of the press die 10. Among these, a portion (inner portion 14) that is deformed toward the inside of the attachment groove 4 is deformed so as to cover the upper surface of the heat pipe 6 accommodated in the attachment groove 4. That is, the heat pipe 6 is deformed into an elliptical cross-sectional shape so that the outer peripheral surface thereof is in close contact with the inner peripheral surface of the mounting groove 4, and the inner portion 14 of the rising wall 8 is directed toward the inner side of the mounting groove 4. It is deformed so as to cover the upper side of the heat pipe 6.

  Thereafter, the press die 10 is raised and detached from the pressed heat pipe 6 and the heat receiving and radiating member 2, thereby completing the fixing of the heat pipe according to the present invention as shown in FIG. . When the heat pipe 6 is fixed by deforming both side portions of the mounting groove 4 as described above, the deformation is not performed over the entire length of the mounting groove 4 in the length direction. For example, when fixing the heat pipe (6) having a corresponding shape to the mounting groove (4) having a curved shape in the middle, only the both side portions of the groove of the straight line portion are fixed. The heat pipe (6) may be fixed to the heat receiving and radiating member 2 by pressing.

  In this way, the rising walls 8, 8 provided on both side portions of the mounting groove 4 are pressed from above with the press die 10, and the rising walls 8, 8 are deformed toward the inside of the mounting groove 4. The heat pipe 6 is firmly fixed to the heat receiving and radiating member 2 from the place where the heat pipe 6 is fixed to the heat radiating and radiating member 2 so as to wrap up the upper part of the heat pipe 6. The problem that the heat pipe 6 is easily detached from the heat receiving and radiating member 2, which has occurred during the fixing with the conventional adhesive, can be effectively solved.

  Further, the heat pipe 6 is pressed against the heat receiving and radiating member 2 by the press die 10 so that the lower portion of the heat pipe 6 is brought into close contact with at least the bottom of the mounting groove 4 and at the same time on the inner peripheral surface of the mounting groove 4. The rising walls 8, 8 provided at both side portions of the mounting groove 4 are pressed by the press die 10, and the rising walls 8, 8 are attached to the mounting groove 4. From the place where the upper part of the heat pipe 6 is deformed so as to wrap inwardly, and they are brought into close contact with each other, the outer peripheral surface of the heat pipe 6 and the inner surface of the mounting groove 4, in other words, the heat pipe 6 and the receiving portion. The gap generated between the heat radiating member 2 can be effectively reduced, and they can be brought into close contact with each other. In addition, the contact area thereof can be further increased. Than Te, the thermal contact resistance between the 受放 heat member 2 and the heat pipe 6 is become possible allowed to effectively reduced.

  Furthermore, when the heat pipe 6 is accommodated in the attachment groove 4, the attachment groove 4 is U-shaped with the cross section opened upward, and its width is larger than that of the heat pipe 6. Since the heat pipe 6 can be easily accommodated in the mounting groove 4 from the upper part of the groove, it is possible to improve the manufacturability. Furthermore, even if the shape of the mounting groove 4 formed on the upper surface of the heat receiving and radiating member 2 is not only a simple linear shape but also a bent shape in the middle, the heat pipe 6 having a shape corresponding thereto Can be easily inserted from the upper part of the mounting groove 4, so that there is an advantage that the shape and arrangement of the groove are not limited in the design of the cooling device.

  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, in the above-described embodiment, the press surface 12 of the press die 10, that is, the surface that presses the heat pipe 6 and the rising wall 8 is a flat surface, but as shown in FIG. A stage provided with a central pressing part 22 for pressing the pipe, and both side pressing parts 24, 24 for pressing the rising wall 8 on both sides of the central pressing part 22 so as to be lower than the central pressing part 22. It is also possible to attach the heat pipe 6 to the heat receiving and radiating member 2 by using the press-shaped press die 20. The process of fixing the heat pipe 6 to the heat receiving and radiating member 2 according to the present invention using such a stepped press die 20 is performed, for example, as shown in FIGS. Is called.

  That is, first, as shown in FIG. 3 (a), the heat pipe 6 is inserted and disposed in the mounting groove 4 in which the rising walls 8 and 8 are formed on both sides and the U-shaped section is formed, and then the press is performed. The mold 20 is lowered, and the heat pipe 6 is pressed by the central pressing portion 22 (FIG. 3B). Thereafter, as shown in FIG. 3C, the press die 20 is further lowered, the rising walls 8 and 8 are pressed by the both side pressing portions 24 and 24, and are deformed toward the inside of the mounting groove 4. Thus, the heat pipe 6 is fixed to the heat receiving and radiating member 2 so as to cover the upper part of the heat pipe 6 with the inner portion of the deformed rising wall 8.

  Thus, in the case where the press die 20 having a stepped shape is used, since the central pressing portion 22 protrudes from the both side pressing portions 24, 24, the top portion of the heat pipe 6 is a rising wall. 8, and the positional relationship between the central pressing portion 22 and both side pressing portions 24, 24 is such that the central pressing portion 22 comes into contact with the heat pipe 6 and the deformation of the heat pipe 6 starts. However, at the same time or a little later, it is only necessary that the pressing portions 24, 24 come into contact with the rising walls 8, 8 so that the deformation starts.

  In addition to such a stepped press die 20, as shown in FIG. 4 (a), the pressing surfaces 28, 28 are concavely depressed while gently curving from the outside toward the inside. In addition, it is also possible to use a press die 30 whose central portion protrudes from the concave portion of the press surface and serves as a central pressing portion 26 for pressing the heat sink. By using such a press die 30, the curved pressing portions 28, 28 formed on both sides of the central pressing portion 26 are recessed toward the central pressing portion 26 while drawing a gentle curved surface. As shown in (b), the press die 30 is lowered toward the heat receiving and radiating member 2 and the heat pipe 6, and the rising wall 8 comes into contact with the curved pressing portion 28, and the rising wall 8 is effective when pressed. Thus, it can be deformed toward the inside of the mounting groove 4. Further, by continuing the pressing, as shown in FIG. 4C, the heat pipe 6 is pressed against the bottom surface of the mounting groove 4 so as to improve the adhesion thereof, and more effectively. The rising wall 8 can be deformed so as to be pressed against the upper surface of the heat pipe 6. As a result, the heat pipe 6 is more firmly fixed to the heat receiving and radiating member 2, and the adhesion between them is increased, and the contact thermal resistance can be effectively reduced.

  Further, even in the shape of the rising wall 8 provided at both side portions of the mounting groove 4, as shown in FIG. 5A, in addition to the rectangular cross section as in the embodiment described above. It is also possible to form a rising wall 32 having a triangular cross section that rises continuously from the inner surface of the mounting groove 4 and descends from the apex portion toward the surface of the heat receiving and radiating member 2 at a predetermined inclination angle. . Even in the case of such a rising wall 32, for example, as shown in FIG. 5B, the heat pipe 6 is first pressed by the stepped press die 20 to be in close contact with the bottom surface of the mounting groove 4. While being deformed, it is deformed into an elliptical shape, while the rising wall 32 is pressed at both side portions of the press die 20 and the rising wall 32 is deformed toward the inside of the mounting groove 4 as shown in FIG. As a result, the heat pipe 6 is attached to the heat receiving and radiating member 2. As described above, the rising walls 32 (8) formed at both side portions of the mounting groove 4 cover the upper surface of the heat pipe 6 accommodated in the mounting groove 4 when pressed from above by the press die. It only needs to be sufficiently deformed.

  Furthermore, the rising walls 8 (32) provided at both side portions of the mounting groove 4 are not essential, and for example, as shown in FIG. 6A, the rising walls are formed at both side portions of the mounting groove 4. It doesn't have to be done. In such a case, for example, the central pressing portion 34 having a flat press surface for pressing the heat pipe 6 and the tip of the convex portion having a mountain shape are formed, and the convex portion is provided on the heat receiving and radiating member 2. When pressed, the heat pipe 6 is fixed to the heat receiving and radiating member 2 by using a press die 38 constituted by the cutting blade portions 36 and 36 that are cut into the upper surface of the heat radiating and radiating member 2. Will be done. That is, as shown in FIG. 6B, the heat pipe 6 inserted and arranged in the mounting groove 4 formed on the upper surface of the heat receiving and radiating member 2 is pressed by the central pressing portion 34, so that the mounting groove 4 After being deformed so as to be in a shape along the inner peripheral surface of the mounting groove 4 while being in close contact with the bottom surface, as shown in FIG. Press so that the tip bites into the heat receiving and radiating member 2. In this way, by pressing the cutting blade portion 36 so as to cut the upper surface of the heat receiving and radiating member 2 and both side portions of the mounting groove 4, both side portions of the mounting groove 4 are placed inside the mounting groove 4. The heat pipe 6 is deformed so as to cover the upper surface of the heat pipe 6, and the heat pipe 6 is fixed to the heat receiving and radiating member 2.

  In FIG. 6, the central pressing portion 34 that presses the heat pipe and the cutting edge portions 36 and 36 that press both side portions of the mounting groove 4 are separated and are moved up and down independently. However, you may use the press type | mold which comprised them integrally. In such a case, the heights of the central pressing portion 34 and the cutting edge portion 36 are adjusted so that both sides of the heat pipe 6 and the mounting groove 4 are pressed simultaneously or with an appropriate delay. The press die (38) will be used. Further, even in the stepped press die 20 and the press die 30 described above, the central pressing portion 22 and the both-side pressing portion 24 (curved pressing portion 28) are separate press dies, and they are independent of each other. Then, both sides (rising walls 8 and 8) of the heat pipe 6 and the mounting groove 4 may be pressed so as to move up and down.

  By the way, in any case, it goes without saying that the degree of deformation of the groove upper wall surface that wraps around the heat pipe can be changed by the press depth, and in the longitudinal direction of the heat pipe, By making the press depth partly deeper than other parts, the deformation of the groove upper wall surface of that part is increased, and by increasing the degree of wrapping the heat pipe more than other parts, the mounting groove is linear In this case, it is also possible to prevent the heat pipe from shifting in the length direction.

  In addition, although not enumerated one by one, the present invention is carried out in a mode to which various changes, modifications, improvements, etc. 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 present invention.

  In the following, one of the representative embodiments of the present invention will be shown to clarify the features of the present invention. However, the present invention is not restricted by the description of such embodiments. It goes without saying that it is not a thing.

  First, in order to construct a heat pipe type heat sink, as a heat receiving and radiating member, an aluminum alloy extruded mold is formed in a block shape and pure copper (phosphorus deoxidized copper), and an outer diameter: 4 mm, a total length : A heat pipe having a length of 150 mm was prepared. Then, when such a block-shaped heat receiving and radiating member is fixed to both ends of the heat pipe to form a heat pipe type heat sink, as shown in FIG. 7A, rising walls are formed on both side portions. A heat pipe according to the present invention, in which a heat pipe is arranged in a mounting groove and is pressed with a stepped press die to deform both the heat pipe and the heat receiving and radiating member and fix the heat pipe to the heat radiating and receiving member. A heat pipe type heat sink was formed by a pipe fixing method, and this was designated as Test Example 1. In addition, the thickness (the height indicated by H in the drawing) of the portion (press portion) where the heat receiving / dissipating member and the heat pipe were deformed by pressing was 6.4 mm.

  Further, as shown in FIG. 7B, a flat press surface after inserting the heat pipe into a mounting groove formed in a bag shape on the surface of the heat receiving and radiating member as shown in FIG. The heat receiving and radiating member was deformed by a press die having a shape, and the heat pipe was indirectly deformed by the deformation to prepare the heat pipe fixed to the heat receiving and radiating member. As in Test Example 1, the thickness of the press part (height indicated by H in the figure) was 6.4 mm.

About the heat pipe type heat sinks of Test Examples 1 and 2 prepared in this way, one of the heat receiving and radiating members made of an aluminum alloy extrusion mold material fixed to both ends of the heat pipe as shown in FIG. In the block on the right side, a heater is attached, so that the block on the other side (left side in the figure) is placed in a hard duct having a width of 50 mm and a height of 20 mm. By arranging and sending cooling air into the duct with a fan, we made a contact thermal resistance evaluation test device on the heat dissipation side (condensation side as a heat pipe), evaluated each contact thermal resistance, and the result Is shown in Table 1 below. Note that the magnitude of the contact thermal resistance is a value when heat is transferred from the right block to the heat pipe and further from the heat pipe to the left block by giving a constant heat load to the heater attached to the right block, that is, The value between the left and right blocks and the heat pipe was calculated from the measured value of the surface temperature (T1) of the right block and the surface temperature (T2) of the left block by the following equation (1).
Contact thermal resistance R = (T1-T2) / Q (1)
[However, Q is the amount of heat input to the heater (unit: W), and the units of T1 and T2 are K. ]

  As is clear from the results in Table 1, the heat pipe heat sink of Test Example 1 using the heat pipe fixing method according to the present invention has a contact heat higher than that of the heat pipe heat sink of Test Example 2 using the conventional fixing method. It can be seen that resistance is reduced and performance is improved. In addition, instead of the heat pipe fixed to the heat receiving and radiating member in this way, for example, when a cooling pipe for passing cooling water or a heating pipe is fixed in a copper pipe having a circular cross section, the same applies. It was confirmed that the effect of.

It is sectional explanatory drawing which shows an example of the form of the part which fixed the heat pipe to the heat receiving / radiating member with the fixing method of the heat pipe according to this invention. It is sectional explanatory drawing which shows the operation | work process which concerns on an example of the fixing method of the heat pipe according to this invention in steps, Comprising: (a)-(c) has each schematically shown the 1 process. As another example of the fixing method of the heat pipe according to the present invention, it is a cross-sectional explanatory view showing the work process when using a step-shaped press die in stages, (a) ~ (c), Each step is shown schematically. As another example of the fixing method of the heat pipe according to the present invention, it is a cross-sectional explanatory diagram showing step by step the work process when using a press die having a curved press surface of the portion that presses the rising wall , (A) to (c) schematically show one step. As still another example of the fixing method of the heat pipe according to the present invention, it is a cross-sectional explanatory diagram showing step by step the work process when the rising wall has a shape different from that shown in FIGS. (A)-(c) has each schematically shown the one process. As another example of the fixing method of the heat pipe according to the present invention, it is a cross-sectional explanatory view showing, in a stepwise manner, an example of a work process when a rising wall is not formed on both sides of the mounting groove. ) Schematically shows one step. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional explanatory drawing which shows the work process used when forming the heat pipe type heat sink in an Example, Comprising: (a) is what formed the rising wall in the both sides of the attachment groove | channel into the step type press die. (B) shows a state where the bag-like mounting groove is pressed with a flat press die by a conventional fixing method. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows roughly the apparatus used when performing the performance evaluation test of the heat pipe type heat sink in an Example, (a) is the form of a side view, (b) is the top view which notched the duct part In the form of

Explanation of symbols

2 heat receiving and receiving member 4 mounting groove 6 heat pipe 8 rising wall 10 press mold 12 press surface

Claims (6)

A predetermined length portion of the heat pipe is accommodated and fixed in a mounting groove provided in the heat receiving and radiating member, and fixed.
The mounting groove of the heat receiving and radiating member has a U-shape, and the heat pipe portion accommodated in the U-shaped mounting groove is pressed and deformed from above toward the groove bottom, so that at least the groove bottom While pressing the both sides of the mounting groove of the heat receiving and radiating member from above, the both sides are deformed to the groove side, and the heat pipe is wrapped at both sides of the mounting groove. And fixing the heat pipe to the heat receiving and radiating member.   The heat pipe fixing method according to claim 1, wherein the pressing operation on both side portions of the mounting groove of the heat receiving and radiating member is started simultaneously with or behind the pressing deformation operation on the heat pipe.   The heat pipe fixing method according to claim 1, wherein both side portions of the mounting groove of the heat receiving and radiating member are configured by rising walls having a predetermined width extending along the mounting groove.   A center pressing portion for pressing the heat pipe, and both side pressing portions for pressing both side portions of the mounting groove of the heat receiving and radiating member, which are respectively positioned on both sides of the center pressing portion, are stepped. The method for fixing a heat pipe according to any one of claims 1 to 3, wherein the press die provided in is used for deformation of the heat pipe and both side portions.   Using a press die provided with a central pressing portion for pressing the heat pipe, and a double-sided curved pressing portion that is positioned on both sides of the central pressing portion and bends and deforms the rising wall toward the mounting groove. The heat pipe fixing method according to claim 3, wherein the heat pipe and both side portions are deformed. A central pressing portion for pressing the heat pipe, and both side cutting blade portions that are positioned on both sides of the central pressing portion, make cuts on both side portions of the mounting groove, and deform both side portions to the groove side The fixing method of the heat pipe according to any one of claims 1 to 3, wherein the heat pipe and both side portions are deformed using a press die provided with.

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