JP2007281504A - Heat sink and fin module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sink that is excellent in manufacturing workability and heat dissipation characteristic. <P>SOLUTION: In this heat sink, many thin plate-like fins 3 are erected in parallel with each other on a base section. To each of the upper end sections and the lower end sections of the fins 3, a bending piece 12, which is almost rectangularly bended and is abutted on the adjacent fins 3, is formed. A protrusion 13 is formed on the front end of the bending piece 12. A recess 14, which fits and connects the protrusion 13 in the adjacent fins 3, is formed at the base end of the bending piece 12. Each of the upper end sections and the lower end sections of the fins 3 arranged in parallel with each other, is connected by the protrusion 13 and the recess 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat sink having a structure in which flat radiating fins are attached to the surface of a base portion, and a fin module used in the heat sink.

  As is well known, a heat sink is attached to an object to be cooled to increase the heat dissipation area in order to promote heat dissipation from the object to be cooled. What is necessary is just to be comprised so that a heat transfer may be attached to a target object in a favorable state. However, in order to have versatility, since it is necessary to have a function of connecting the fin member to the object to be cooled, generally, the fin member is integrated with the base portion having an appropriate shape. . The base part in this type of heat sink has no particular function in terms of heat dissipation, so in order to increase heat dissipation efficiency or heat dissipation capability as much as possible, heat dissipation fins are attached to the entire surface of the base part. Is common. An example of such a heat sink is described in Patent Document 1, Patent Document 2, and the like.

  Conventionally, in order to improve the manufacturability of a heat sink in which a heat radiating fin is formed in a flat plate shape, a heat sink is formed by folding a single metal plate to cover the entire surface of the base portion. In addition, a heat sink having a structure attached to a base portion is known. This type of radiating fin is called a folded fin, and has a structure in which tunnel-like ventilation paths and ventilation paths opened upward are alternately formed, so that it is forced in the direction along the surface of the radiating fins. It is used as a heatsink that blows and cools. An example of this type of heat sink is described in Patent Document 3 and the like.

Japanese Patent Laid-Open No. 11-87961 Japanese Patent Laid-Open No. 2001-244677 US Pat. No. 6,288,899

  As a heat sink having a structure in which a large number of fins are erected on the base portion as described in Patent Document 1 and Patent Document 2, a structure in which fins are attached to a base portion prepared in advance, and a structure in which both are integrally molded It has been known. In the former structure in which the base part and the fins are separate members, it is necessary to join the two together to integrate them. However, if a means such as brazing or soldering is adopted as the structure for the joining, a thin plate Since the fin-shaped fins cannot secure a sufficient bonding area, it is difficult to reliably and highly strongly attach the thin plate-shaped fin capable of expanding the heat radiation area to the base portion.

  In order to eliminate such inconvenience, a structure in which a groove is formed in the base portion and the lower end portion of the thin plate-like fin is inserted into the groove and fixed can be considered. However, in such a structure, it is necessary to narrow the groove width as the fin is thinned. However, since the groove width that can be simultaneously formed when manufacturing the base portion is limited to a width that is larger than a certain degree, If a method such as cutting is employed to form a narrow groove, not only the processing man-hours increase, but also the material yield decreases and the productivity decreases.

  In addition, as a method of manufacturing the fin and the base portion integrally, there are a casting method such as die casting and an extrusion molding method. In order to make the fin into a thin plate shape, a cavity for the fin or a molding die is used. Since the molten metal does not reach the inside of the cavity sufficiently, casting defects are likely to occur and the mold is easily damaged. To eliminate this, thicken the fins. Alternatively, it is necessary to reduce the height with respect to the wall thickness. As a result, inconveniences such as an increase in the heat capacity of the fins and the inability to secure a necessary and sufficient heat radiation area occur.

  On the other hand, in the heat sink using the folded fin, when the folded fin is joined to the base portion, it is joined at the folded edge of the folded fin, so it is difficult to secure the joining area. Since the bent edges are not aligned on a plane, a gap is created between one of the bent edges and the surface of the base portion. As a result, the thermal resistance between the two becomes large, and thus the heat dissipation characteristics are improved. May be reduced. Furthermore, when forced air cooling is performed by blowing air from above the heat sink, the half of the space between the fins is in a tunnel shape, so it is necessary to open it upward, and for that reason folded There is an inconvenience that requires additional processing such as cutting the bent edge of the fin.

  The present invention has been made by paying attention to the above technical problem, and an object of the present invention is to provide a heat sink and a fin module for the heat sink that have excellent heat radiation characteristics and good productivity.

  In order to achieve the above object, the invention of claim 1 is directed to a heat sink in which a plurality of thin plate-like fins are erected on a base portion in parallel with each other, and the lower end portions of the fins are folded in two layers. A two-sheet overlapping portion is formed, and the two-sheet overlapping portion is inserted into and fixed to a groove portion formed in the base portion.

  Further, the invention of claim 2 is that, in the configuration of claim 1, the caulking process for generating surplus so as to narrow the opening width of the groove portion is performed at a location adjacent to the opening portion of the groove portion. It is a heat sink characterized by.

  Furthermore, the invention according to claim 3 is the configuration according to claim 1 or 2, wherein the width of the groove portion on the bottom side is larger than the width of the opening of the groove portion, and the two-sheet overlapping portion inserted into the groove portion is the groove portion. The heat sink is characterized by being expanded in the width direction.

  Furthermore, the invention of claim 4 is the heat sink according to the structure of claim 3, wherein a shaft-like member is inserted into the two-sheet overlapping portion, and the two-sheet overlapping portion is expanded in the width direction of the groove portion. .

  According to a fifth aspect of the present invention, in the configuration of any one of the first to fourth aspects, the distal end portion of the bent piece forming the two-sheet overlapping portion enters the bottom side from the opening end of the groove portion. It is the heat sink characterized.

  According to a sixth aspect of the present invention, in the structure according to any of the first to fifth aspects, a bent piece is formed at the upper end of the fin so as to be bent at a substantially right angle and brought into contact with an adjacent fin. At the same time, a protrusion is formed at the tip of the bent piece, and a recess for fitting and connecting the protrusion in the adjacent fin is formed at the base end of the bent piece and arranged parallel to each other. The heat sink is characterized in that the upper ends of the fins are connected by the protrusion and the recess.

  Further, according to a seventh aspect of the present invention, there is provided the fin according to any one of the first to sixth aspects, wherein the bent pieces are formed at both ends excluding the central portion in the width direction of the fin and adjacent to each other. The heat sink is characterized in that an opening is formed in which a gap between them opens to the upper end side.

  Further, according to the invention of claim 8, in the heat sink in which a plurality of thin plate-like fins are erected on the base portion in parallel with each other, the fins are adjacent to each of the upper end portion and the lower end portion of the fin by being bent substantially at right angles. A bent piece is formed in contact with the fin to be formed, a protrusion is formed at the tip of the bent piece, and a recess in which the protrusion is fitted to and connected to the adjacent fin is the bent piece. The upper end portion and the lower end portion of the fins formed at the base end portion and arranged in parallel to each other are connected by the projection portion and the recess portion.

  The invention of claim 9 is the structure of claim 8, wherein the fin connected by the protrusion and the recess is joined to the base portion by a flat portion formed by the bent piece on the lower end side. It is the heat sink characterized by having.

  According to the invention of claim 10, bent pieces are formed at the upper end and the lower end of a large number of thin plate-like fins arranged in parallel to each other and bent substantially at right angles to be in contact with adjacent fins. In addition, a protrusion is formed at the distal end of the bent piece, and a recess for fitting and connecting the protrusion in the adjacent fin is formed at the proximal end of the bent piece and is parallel to each other. In the fin module, the upper end portion and the lower end portion of the fins arranged are connected to each other by the protrusion and the recess.

  In the invention of claim 1, since the two-sheet overlapping portion that is bent and thickened into two-sheet overlapping is inserted and fixed in the groove portion formed in the base portion, the width of the groove portion is about twice the thickness of the fin. It is getting bigger. Therefore, even if the fin is thin plate-shaped, a groove with a wide opening can be formed in the base, so that the groove is formed at the same time as manufacturing by casting or extruding the base without using a method such as cutting. In addition, the manufacturability of the base portion is good, and the fin can be easily attached to the base portion.

  In the invention of claim 2, the two-sheet overlapping portion is not only inserted into the groove portion, but is also sandwiched by the groove portion. As a result, the strength of the fins attached to the base is increased, and as a result, not only can the fins fall off, but also the thermal resistance between the base and the fins is reduced, resulting in heat dissipation characteristics as a heat sink. Will improve.

  In the invention of claim 3, the portion of the two-layer overlapped portion that expands in the groove portion is caught in the groove portion, so-called anchor effect (throwing effect) is generated, and the fins are prevented from falling off from the base portion.

  In the invention of claim 4, the two-layer overlapping portion expanding inside the groove portion has a solid structure into which the shaft-like member is inserted, and as a result, the fin is more securely fixed to the base portion.

  In the invention of claim 5, the tip of the bent piece is caught on the inner wall of the groove. Therefore, the fin does not come out of the groove portion, and the attachment strength of the fin to the base portion is increased.

  In the invention of claim 6, the bent piece formed at the upper end portion of the fin is in contact with the adjacent fin, and in this state, the protrusion and the concave portion are engaged, and the upper end portions of the fin are connected to each other. The For this reason, the distance between the fins is kept substantially constant, air circulation is smooth when forced cooling is performed, and the fin arrangement is uniform, so that the appearance is good and the product value is prevented from being lowered.

  In the invention of claim 7, the bent piece formed at the upper end portion of the fin does not cover the entire upper end of the gap between the fins, and the gap opens upward. Therefore, forced cooling from above the fins can be performed by disposing the fan in the opening portion as desired.

  In the invention of claim 8, the fins arranged in parallel to each other are maintained at a constant interval by the bent pieces formed at the upper and lower ends, and each projection is engaged with the recess, whereby each fin is The upper and lower ends are connected. Therefore, a plurality of fins are integrated in a state where they are arranged in parallel at regular intervals. As a result, a plurality of fins can be collectively attached to the base portion.

  In the invention of claim 9, since the bonding area of the fin to the base portion is widened, the fin is surely and firmly integrated into the base portion, and the thermal resistance between the two is reduced, and the heat dissipation characteristics as a heat sink are good. become.

  In the invention of claim 10, the fins arranged in parallel to each other are maintained at a constant interval by the bent pieces formed at the upper and lower ends, and each protrusion is engaged with the recess, whereby each fin is The upper and lower ends are connected. Therefore, a plurality of fins are integrated in a state where they are arranged in parallel at regular intervals. A plurality of fins are handled in a lump in this integrated state.

  Next, the present invention will be described based on a specific example shown in the drawings. The heat sink 1 of the present invention has a structure in which a plurality of thin plate-like fins 3 are erected on a base portion 2. FIG. 1 is a partial side view of the heat sink 1, and the fin 3 is configured as a rectangular thin plate, for example, by a metal having high thermal conductivity such as aluminum, an aluminum alloy, or copper. A portion having a predetermined length at the lower end portion (the end portion on the base portion 2 side) of each fin 3 is bent over the entire width of the fin 3 and folded in two, thereby forming a two-sheet overlapping portion 4. That is, the thickness of the lower end portion of the fin 3 is twice that of the other portions.

  On the other hand, the base portion 2 is a member formed, for example, in a flat plate shape from a metal having high thermal conductivity such as aluminum, an aluminum alloy, or copper, and a plurality of groove portions 5 are formed on the upper surface (the surface to which the fins 3 are attached). Are formed in parallel to each other at a predetermined interval. The opening widths of these groove portions 5 are approximately twice the thickness of the fins 3, that is, are set to be substantially the same as or slightly smaller than the thickness of the two-sheet overlapping portion 4. Moreover, the depth of these groove parts 5 is deeper than the length (the height in the up-down direction in FIG. 1) of the two-sheet overlapping part 4, and therefore the bent piece 6 constituting the two-sheet overlapping part 4 is the groove part. The upper edge of the bent piece 6 is caught on the inner wall of the groove 5.

  A caulking portion 7 is formed between the open ends of each of the groove portions 5. The crimped portion 7 is formed by driving a tool (not shown) such as a scissors whose tip is pointed in a V shape. Thus, the surplus due to the formation of the crimping portion 7 moves to the respective groove portions 5 side, and as a result, the surplus thickness acts to narrow the groove width of each groove portion 5, so that the lower end portion of the fin 3 That is, the two-layer overlapping portion 4 is sandwiched between the groove portions 5, and as a result, the fins 3 are firmly fixed to the base portion 2. Since the surplus movement is caused in this way, the opening of the groove portion 5 is deformed so as to be closed, so that the front end portion of the bent piece 6 is bitten into the side wall of the groove portion 5. As a result, the fin 3 is more securely prevented from coming off.

  The heat sink 1 is used by bringing the base portion 2 into contact with a heat generating component such as an arithmetic element or in contact with a heat pipe (not shown) that transports heat from the heat generating component. When the heat of the heat generating component is transmitted to the base portion 2, the heat is transmitted to the fin 3 and is dissipated from here to the surrounding atmosphere. In that case, since the lower end portion of the fin 3 is firmly sandwiched in the groove portion 5 and is in close contact with the base portion 2, the thermal resistance between the base portion 2 and the fin 3 is small, and therefore the base is efficiently Heat can be transferred from the portion 2 to the fins 3 to be dissipated. That is, the heat dissipation characteristics as the heat sink 1 are improved. In the above configuration, since the width of the groove 5 formed in the base portion 2 can be about twice the thickness of the fin 3, for example, when the base portion 2 is manufactured by extrusion, the groove 5 As a result, the number of processing steps as a whole of the heat sink 1 including the base portion 2 is reduced, and the productivity is improved.

  Note that the above-described crimping portion 7 is formed in order to increase the attachment strength of the fin 3. Therefore, for example, if the two-sheet overlapping portion 4 of the fin 3 is press-fitted into the groove portion 5, the crimping portion 7 is not particularly formed. May be.

  Next, another example of the present invention will be described. 2 and 3 are schematic cross-sectional views showing other examples of the present invention, and are examples in which the two-layer overlapping portion 4 has an anchor effect. That is, the groove portion 5 has a shape in which the width on the bottom side (the lower side in FIGS. 2 and 3) with respect to the opening width is wide, for example, a substantially circular cross section. 3 is set to almost twice the thickness. The groove portion 5 having such a shape can be formed at the same time when the base portion 2 is extruded, for example.

  On the other hand, the two-layer overlapping portion 4 formed on the lower end side of the fin 3 and inserted into the groove portion 5 is expanded so as to follow the inner surface of the groove portion 5. Specifically, it is expanded in the left-right direction in the figure so as to form a circular cross section. Since the portion enlarged in the width direction of the groove portion 5 is hooked inside the groove portion 5, the fin 3 is prevented from coming out of the groove portion 5, and the attachment strength of the fin 3 to the base portion 2 is increased. The fins 3 can be securely attached to the base portion 2.

  The process of enlarging the two-layered portion 4 of the fin 3 as described above can be performed by inserting some tool between the two-layered portions 4 and deforming the two-layered portion 4 in the width direction of the groove portion 5. Alternatively, as shown in FIG. 3, the two-layer overlapping portion 4 can be buckled and enlarged. That is, by making the length (height) of the bent piece 6 constituting the two-sheet overlapping portion 4 larger than the depth of the groove portion 5, the end portion of the bent piece 6 is protruded from the groove portion 5, and the state When the fin 3 and the bent piece 6 are pressed against the groove 5 side along the plate surface direction with an appropriate jig 8, buckling occurs so that the double-layered portion 4 opens, and the shape along the inner surface of the groove 5 Can be spread out.

  In addition, in this invention, you may comprise so that the two-sheet overlapping part 4 may be expanded, without making the groove part 5 into the shape expanded on the bottom side. An example of this is shown in FIG. 4. In the example shown here, a two-sheet overlapping portion 4 is inserted into a groove portion 5 having a constant width, and a shaft-shaped member, for example, a pin 9 is press-fitted between the two-sheet overlapping portions 4. In this structure, the two-layer overlapping portion 4 is pressed so as to spread in the left-right direction.

  In such a structure, since the outer surface of the two-layer overlapping portion 4 is pressed against the inner surface of the groove portion 5, the frictional force in this portion is increased, and the attachment strength of the fin 3 to the base portion 2 is improved. Thermal resistance is reduced. In addition, when the deformation | transformation which the width expands to the groove part 5 by press-fitting the pin 9 is caused, the anchor effect is generated in the two-layer overlapping part 4 and the fin 3 is more surely the same as the example shown in FIGS. 2 and 3 described above. Will be retained.

  The base portion 2 in the present invention is not limited to the above-described flat plate shape. For example, as shown in FIG. 5, a flat plate portion 10 and a plurality of relatively thick radiating fin portions 11 are extruded. It is formed integrally by a method such as molding, and the two-layer overlapping portion 4 formed at the lower end portion of the fin 3 is inserted into the groove portion 5 formed between the radiating fin portions 11, and caulking is performed on both sides thereof. Thus, the fins 3 may be firmly fixed to the groove portions 5 by forming the crimped portions 7.

  The fins 3 are arranged in parallel to each other at a substantially constant interval. In order to maintain the arrangement, the upper ends of the fins 3 can be connected to each other. An example of this will be described below. 6 to 8, a bent piece 12 is formed at the upper end portion of each fin 3 and is bent substantially at a right angle. The bent piece 12 may be formed over the entire width of the upper end portion of the fin 3, but in the example shown in FIGS. 6 to 8, the bent piece 12 is formed on the left and right end portions.

  A protrusion 13 is formed at the center of the tip of each bent piece 12. A through hole 14 having a shape corresponding to the protrusion 13 is formed at a base end portion of each bent piece 12 and at a position corresponding to each protrusion 13. The through-hole 14 is a portion corresponding to the concave portion of the present invention, and is used to connect the upper ends of the adjacent fins 3 by fitting the adjacent protrusions 13 together.

  Specifically, by arranging the fins 3 in parallel with each other with an interval substantially equal to the protruding length of the bent piece 12, the tip of the bent piece 12 is placed on the back side of the upper end of the adjacent fin 3. It abuts and the interval between the upper ends of the fins 3 is kept constant. In this state, the protrusion 13 is fitted into the through hole 14 in the adjacent fin 3. In this state, when a pressing force or striking force is applied to the projecting portion 13 in the direction in which the projecting portion 13 is pushed into the through hole 14, the tip side portion of the projecting portion 13 sinks into the through hole 14, 14 is engaged with the upper edge portion of the fin 3 appearing inside 14, that is, engaged.

  On the left and right ends of the upper ends of the fins 3 connected in this manner, the bent pieces 12 are continuously arranged to form a flat plate portion 15 with the bent pieces 12, and an opening sandwiched between the flat plate portions 15. 16 is formed at the center in the width direction. A gap between the fins 3 is opened upward by the opening 16. Therefore, by disposing a fan (not shown) in the opening 16, forced air cooling from the upper direction of the heat sink 1 (direction facing the base portion 2) is possible.

  The bending piece 12, the protrusion 13, and the through hole 14 described above have a function of connecting the fins 3 to each other. Therefore, if this kind of bent piece, protrusion, and through hole are provided also on the lower end side of the fin 3 and the lower end portions of the fin 3 are connected to each other, a plurality of fins 3 arranged parallel to each other with a predetermined interval therebetween. Can be handled as an integrated module connected in series. 9 and 10 show examples thereof.

  FIG. 9 shows a plurality of fins 3 whose upper end portions are connected by the bent piece 12, the projecting portion 13, and the through-holes 14 upside down. In the lower end portions of these fins 3, the width direction is shown. In addition, a bent piece 17 is formed over the entirety. The bent piece 17 is formed by bending the lower end portion of the fin 3 substantially at a right angle. Protruding portions 18 are formed at a plurality of locations (two locations in the illustrated example) of the tip portion. A through-hole 19 is formed in the base end portion of each bent piece 17.

  And the front-end | tip part of each bending piece 17 is contact | abutted to the back side of the adjacent fin 3, and the projection part 18 is fitted in the through-hole 19 of the adjacent fin 3 in that state, and it is the same as the projection part 13 mentioned above The lower ends of the fins 3 are connected to each other by being deformed. In the example shown in FIGS. 9 and 10, since the bent piece 17 is formed over the entire width direction of the fin 3, the bottom portion 20 is formed at the lower end portion of the fin 3 by these bent pieces 17.

  Thus, the module 21 in which the plurality of fins 3 are integrally connected can be used as the heat sink 23 by joining the bottom surface portion 20 to the top surface of the appropriate base portion 22. The joining to the base portion 22 can be performed by various means such as brazing, soldering, or joining with an adhesive. And since it joins with the upper surface of the base part 22 by the bottom face part 20, the joining area becomes large, therefore, the fin 3 can be reliably integrated with the base part 22 with high intensity | strength, and simultaneously a base Since the thermal resistance between the portion 22 and the fin 3 or the module 21 is reduced, the heat dissipation characteristics as the heat sink 23 are improved.

  The present invention is not limited to the above specific example. In short, it is only necessary to insert the portion bent in the two-layer overlapping portion into the groove portion formed in the base portion and fix the groove portion, and thus the caulking portion opens the groove portion. In addition to narrowing the width, a wedge may be press-fitted together with the two-layer overlapping portion in the groove portion.

It is a partial side view showing typically an example of a heat sink concerning this invention. It is a fragmentary sectional view which shows an example of the structure which extended the 2 sheet overlap part. It is a fragmentary sectional view showing an example of the processing process which expands the two sheets pile part. It is a fragmentary sectional view showing an example in which a pin is press-fitted into a two-sheet overlapping portion. It is a side view which shows typically the other example of the heat sink which concerns on this invention. It is a fragmentary sectional view which shows the structure which connected the upper end part of the fin. It is a fragmentary perspective view which shows the example of the bending piece and projection part which were formed in the state part of a fin, and a through-hole. It is a perspective view which shows an example of the state which connected the upper end part of the several fin. It is a perspective view by the side of the bottom which shows an example of the module comprised by connecting the lower end parts of several fins via the bending piece. It is a typical side view showing an example of a heat sink using the module.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,23 ... Heat sink, 2,22 ... Base part, 3 ... Fin, 4 ... Two-layer overlapping part, 5 ... Groove part, 6 ... Bending piece, 7 ... Crimping part, 9 ... Pin, 10, 17 ... Bending piece, 11, 18 ... projection part, 12, 19 ... through-hole, 20 ... bottom part, 21 ... module.

Claims (10)

In a heat sink in which a large number of thin plate-like fins are erected on the base portion in parallel with each other,
A heat sink, wherein a lower end portion of the fin is folded into a two-ply form to form a double-ply portion, and the double-ply portion is inserted and fixed in a groove formed in the base portion.   2. The heat sink according to claim 1, wherein a caulking process for generating a surplus so as to narrow an opening width of the groove portion is performed at a location adjacent to the opening portion of the groove portion.   The width on the bottom side of the groove part is larger than the width of the opening part of the groove part, and the two-sheet overlapping part inserted into the groove part is expanded in the width direction of the groove part. Heat sink described in.   The heat sink according to claim 3, wherein a shaft-like member is inserted into the two-sheet overlapping portion, and the two-sheet overlapping portion is enlarged in the width direction of the groove portion.   The heat sink according to any one of claims 1 to 4, wherein a front end portion of the bent piece forming the two-sheet overlapping portion enters a bottom side from an opening end of the groove portion.   At the upper end of the fin, a bent piece is formed that is bent at a substantially right angle and is brought into contact with the adjacent fin, and a protrusion is formed at the tip of the bent piece, and the protrusion on the adjacent fin A concave portion that fits and is connected to each other is formed at a base end portion of the bent piece, and upper ends of fins that are arranged in parallel to each other are connected by the protruding portion and the concave portion. The heat sink according to any one of claims 1 to 5.   The bent piece is formed at both ends of the fin in the width direction, and an opening is formed so that a gap between adjacent fins opens to the upper end side. The heat sink according to any one of claims 1 to 6. In a heat sink in which a large number of thin plate-like fins are erected on the base portion in parallel with each other,
Each of the upper end portion and the lower end portion of the fin is formed with a bent piece that is bent substantially at right angles and brought into contact with the adjacent fin, and a protrusion is formed at the tip of the bent piece and adjacent to the fin. A concave portion that fits and connects the protruding portion of the fin is formed at the proximal end portion of the bent piece, and the upper end portion and the lower end portion of the fins arranged in parallel to each other are formed by the protruding portion and the concave portion, respectively. A heat sink characterized by being connected.   The heat sink according to claim 8, wherein the fin connected by the protrusion and the recess is joined to the base portion at a flat portion formed by the bent piece on a lower end side.   A plurality of thin plate-like fins arranged in parallel to each other are formed with bent pieces that are bent substantially at right angles and are brought into contact with adjacent fins at the upper and lower ends, and the tips of the bent pieces A protrusion formed in the portion, and a recess into which the protrusion in the adjacent fin is fitted and connected is formed at the base end of the bent piece, and the upper end of the fin arranged in parallel to each other; Each of a lower end part is connected with the said projection part and the recessed part, The fin module characterized by the above-mentioned.

Images