JP2018141624A - Radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiator having high thermal conductivity.SOLUTION: A radiator includes one straight heat medium pipe P through which fluid flows, a metal base 2 which is different from the heat medium pipe P and is brought into contact with an outer peripheral surface of the heat medium pipe P, and a plurality of rectangular flat fins 3 integrally formed with the base 2 and juxtaposed at intervals around the heat medium pipe P. The fins 3 are juxtaposed perpendicularly to an axial direction of the heat medium pipe P, and are extended to a direction separating from the heat medium pipe P over the whole circumference of the heat medium pipe P. The base 2 and the fins 3 are formed of aluminum or an aluminum alloy, and the heat medium pipe P is formed of copper or a copper alloy.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radiator.

  For example, Patent Document 1 describes a radiator including a heat medium pipe through which a fluid flows and a plurality of fins arranged in parallel to the heat medium pipe. The plate-like fin is formed with a mounting seat that opens upward and has a U-shape when viewed from the front. The heat medium pipe is fitted to the fin mounting seat and fixed to the fin by brazing.

JP 2001-165588 A

  Since the radiator is a member that releases heat to the outside, high heat conductivity is required.

  From such a viewpoint, an object of the present invention is to provide a radiator having high thermal conductivity.

  In order to solve such problems, the present invention separates a straight heat medium pipe through which a fluid flows and the heat medium pipe into contact with the outer peripheral surface of the heat medium pipe. A base made of metal and a plurality of flat fins that are formed integrally with the base and have a rectangular shape arranged around the heat medium pipe with a space therebetween, each fin being the heat medium And arranged in a direction perpendicular to the axial direction of the heat pipe and extending away from the heat medium pipe on the entire circumference of the heat medium pipe, and the base and the fin are made of aluminum or It is made of an aluminum alloy, and the heat medium pipe is made of copper or a copper alloy.

  The present invention also provides a straight heat medium pipe through which a fluid flows, a metal base that is separate from the heat medium pipe and contacts the outer peripheral surface of the heat medium pipe, and is integrated with the base. A plurality of flat fins having a rectangular shape formed and arranged in parallel at intervals, each fin being arranged in parallel or in parallel to the axial direction of the heat medium pipe The fins are arranged in parallel, and are formed at positions facing both sides of the heat medium pipe, the base and the fins are formed of aluminum or an aluminum alloy, and the heat The medium tube is made of copper or a copper alloy.

  According to such a radiator, since the outer peripheral surface of the heat medium pipe and the base are in contact with each other and the base and the fin are integrally formed, the thermal conductivity can be improved. Moreover, while forming a fin with aluminum or aluminum alloy, while being able to achieve weight reduction, the moldability in cutting can be improved. Moreover, heat conductivity and corrosion resistance can be improved by forming the pipe | tube for heat media with copper or a copper alloy.

  According to the heat radiator according to the present invention, the thermal conductivity can be improved.

It is a perspective view which shows the heat radiator which concerns on 1st embodiment of this invention. It is II sectional drawing of FIG. It is a perspective view which shows the preparatory process of the manufacturing method of the heat radiator which concerns on 1st embodiment. It is a perspective view which shows the cutting process of the manufacturing method of the heat radiator which concerns on 1st embodiment. It is a top view which shows the cutting process of the manufacturing method of the heat radiator which concerns on 1st embodiment. It is a top view which shows the cutting process of the manufacturing method of the heat radiator which concerns on the modification of 1st embodiment. It is a perspective view which shows the preparatory process of the manufacturing method of the heat radiator which concerns on 2nd embodiment. It is sectional drawing which shows the insertion process and cover plate arrangement | positioning process of the manufacturing method of the heat radiator which concerns on 2nd embodiment. (A) is a perspective view which shows the joining process of the manufacturing method of the heat radiator which concerns on 2nd embodiment, (b) is II-II sectional drawing of (a). It is a perspective view which shows the heat radiator which concerns on 3rd embodiment. It is a model front view which shows the cutting process of the manufacturing method of the heat radiator which concerns on 3rd embodiment, Comprising: (a) shows before cutting, (b) shows after cutting. It is a perspective view which shows the heat radiator which concerns on 4th embodiment. It is a model side view which shows the cutting process of the manufacturing method of the heat radiator which concerns on 4th embodiment.

[First embodiment]
Embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the radiator 1 according to the present embodiment includes a heat medium pipe P, a base 2, and a plurality of fins 3. The radiator 1 is an instrument that releases the heat of fluid flowing through the heat medium pipe P to the outside, and is used in a heat exchanger or the like.

  The heat medium pipe P has a cylindrical shape. A fluid for releasing heat flows through the inside of the heat medium pipe P. The material of the heat medium pipe P may be appropriately selected from metals having high thermal conductivity, but in the present embodiment, copper or copper alloy is used. By forming the heat medium pipe P from copper or a copper alloy, the thermal conductivity and the corrosion resistance can be improved. By increasing the corrosion resistance of the heat medium pipe P, a highly reactive liquid can be circulated. Moreover, the connection with pipe members other than the heat radiator 1 becomes easy by forming the heat medium pipe P from copper or a copper alloy. Although the heat medium pipe P is cylindrical in this embodiment, it may be a cylindrical member having an elliptical or polygonal cross section.

  As shown in FIG. 2, the base 2 is a cylindrical portion formed around the heat medium pipe P. The inner peripheral surface of the base 2 is in close contact with the entire outer peripheral surface of the heat medium pipe P in the circumferential direction or is in contact with almost no gap. The thickness of the base 2 may be set as appropriate, but in the present embodiment, it is substantially equal to the thickness of the heat medium pipe P.

  The fin 3 is a plate-like member integrally formed around the base portion 2. The fins 3 are arranged perpendicular to the central axis C of the heat medium pipe P, and are arranged in parallel at equal intervals with a gap. The plurality of fins 3 have the same shape. The center of the fin 3 (the intersection of diagonal lines) coincides with the central axis C of the heat medium pipe P. The shape of the fin 3 is not particularly limited, but presents a rectangle in the present embodiment.

  The material of the base 2 and the fin 3 may be appropriately selected from metals that can be cut and have high thermal conductivity. In this embodiment, aluminum or an aluminum alloy is used. By using aluminum or an aluminum alloy as the material of the base 2 and the fin 3, it is possible to reduce the weight and reduce the material cost.

  Next, the manufacturing method of the heat radiator which concerns on this embodiment is demonstrated. In the heat radiator manufacturing method according to the present embodiment, a preparation process and a cutting process are performed.

  As shown in FIG. 3, the preparation step is a step of preparing the cutting block 10 and fixing the cutting block 10 to a jig (not shown). The block 10 to be cut is a member that is a base of the radiator 1. The block 10 to be cut is composed of a base block 11 and a heat medium pipe P.

  The base block 11 has a rectangular parallelepiped shape. The base block 11 is made of aluminum or an aluminum alloy. The heat medium pipe P penetrates from the one end face 12 of the base block 11 to the other end face 13 facing the one end face 12. The outer peripheral surface of the heat medium pipe P is in close contact with or substantially in contact with the base block 11 in the circumferential direction, and the heat medium pipe P and the base block 11 are not rotatable.

  The block 10 to be cut can be formed by, for example, pressing the heat medium pipe P into a through hole formed in the base block 11. Further, the block 10 to be cut can be formed by expanding the tube or expanding and bonding the tube while inserting the heat medium tube P into the through hole formed in the base block 11.

  In the preparation step, the block 10 to be cut is fixed to a jig (not shown). As shown in FIG. 4, the jig translates in the direction close to or away from the multi-cutter 20 while holding the block 10 to be cut, and rotates around the central axis C of the heat medium pipe P. It is possible.

  The cutting step is a step of cutting the block 10 to be cut using the multi-cutter 20 to form the fins 3. In the cutting process, an approach process, a rotation process, and a retracting process are performed.

  The multi-cutter 20 includes a rotation shaft 21 and a plurality of disk cutters 22 attached perpendicular to the rotation shaft 21. The disk cutter 22 is an instrument that cuts an object by rotating at high speed around the rotation shaft 21. Although not specifically shown, a plurality of blades are provided on the outer edge of the disk cutter 22. The disk cutters 22 are arranged side by side with a gap. The gap between the disk cutters 22 and 22 is equal to the thickness of the fin 3. The thickness of the disk cutter 22 is equivalent to the gap between the adjacent fins 3 and 3.

  In the entering step, first, the cutting block 10 and the multi-cutter 20 are arranged so that the rotation axis (rotation center axis) 21 of the multi-cutter 20 and the central axis C of the heat medium pipe P are parallel to each other. Then, the multi-cutter 20 is driven to rotate the disk cutter 22 in the circumferential direction. The multi-cutter 20 is continuously rotated until the retracting process is completed.

  Next, as shown in FIG. 5, the block to be cut 10 is caused to enter the multi-cutter 20 until the cutting depth d is set in advance in a state where the multi-cutter 20 is fixed so as not to move. That is, the block 10 to be cut is brought close to the rotary shaft 21 while maintaining the parallel state of the rotary shaft 21 and the central axis C. In this embodiment, since the cutting depth on the diagonal line is the largest in the block 10 to be cut, it is preferable to move the straight line connecting the central axis C and the ridge line 14a and the radius of the disk cutter 22 so as to overlap. The cutting depth d may be appropriately set within a range not reaching the heat medium pipe P. The distance t from the outer edge of the disk cutter 22 to the heat medium pipe P is the thickness of the base 2 (see FIGS. 1 and 2).

  In the rotation process, the cutting block 10 is moved around the central axis C while maintaining the distance between the rotary shaft 21 and the central axis C so that the distance t between the heat medium pipe P and the outer edge of the disk cutter 22 is constant. Rotate to In the present embodiment, the block 10 to be cut is rotated one or more times. Thereby, an “uncut region” is formed around the heat medium pipe P, and this uncut region becomes the base 2 (see FIG. 2).

  In the retracting process, the block 10 to be cut is separated from the multi-cutter 20. In a state where the rotation axis (rotation center axis) 21 of the multi-cutter 20 and the center axis C of the heat medium pipe P are maintained in parallel, they are separated from each other. The heat radiator 1 shown in FIG. 1 is completed by the above process.

  According to the method for manufacturing a radiator described above, the heat medium pipe P, the base 2 and the fins 3 are integrally formed from one cut block 10, so that the heat medium pipe P and the fins are conventionally formed. No brazing material is interposed between them. Thereby, the thermal conductivity of the radiator 1 can be improved. Moreover, since it is only necessary to cut one block 10 to be cut with the multi-cutter 20, the work of assembling each member becomes unnecessary, and the radiator 1 can be easily manufactured.

  Further, in the cutting process, cutting is facilitated by rotating the block 10 to be cut. Further, the thickness of the fin 3 and the gap between the fins 3 and 3 can be easily set by appropriately setting the thickness of the disk cutter 22 of the multi-cutter 20 and the gap between the disk cutters 22 and 22.

[Modification]
Next, a modification of the first embodiment will be described. As shown in FIG. 6, the radiator manufacturing method according to the modification is different from the first embodiment in that the multi-cutter 20 is revolved with respect to the block 10 to be cut. Here, it demonstrates centering on the part which is different from 1st embodiment, and abbreviate | omits description of the part which overlaps with 1st embodiment.

  In the cutting process according to the third embodiment, an approach process, a revolution process, and a retreat process are performed. In the entering step, the rotating multi-cutter 20 enters the block 10 to be cut. In order to allow the multi-cutter 20 to enter the block 10 to be cut, the block 10 to be cut and the multi-cutter 20 may be relatively translated and the distance between them may be reduced.

  When the multi-cutter 20 is entered to a predetermined depth, the process proceeds to the revolution process. In the revolution process, the multi-cutter 20 is revolved around the central axis C while maintaining the distance between the rotational axis (rotational central axis) 21 and the central axis C of the block 10 to be cut. In the present embodiment, the multi-cutter 20 is moved one or more times. When the revolution process is completed, the process proceeds to the evacuation process. In the retracting process, the block 10 to be cut and the multi-cutter 20 are relatively separated from each other.

  Thus, the radiator 1 can be easily manufactured even if the multi-cutter 20 is moved around the block 10 to be cut as in the method of manufacturing a radiator according to the modification.

[Second Embodiment]
Next, the manufacturing method of the heat radiator which concerns on 2nd embodiment is demonstrated. In the radiator manufacturing method according to the second embodiment, the configuration of the block 30 to be cut is different from that of the first embodiment. In the description according to the second embodiment, the description will focus on parts that are different from the first embodiment.

  As shown in FIG. 7, the block 30 to be cut according to the second embodiment includes a base block 31, a heat medium pipe P, and a lid plate 33. The base block 31 includes a lid groove 34 and a concave groove 35. The base block 31 is an extruded shape member made of aluminum or an aluminum alloy. The lid groove 34 opens on the surface 31 a of the base block 31. The lid groove 34 is formed continuously from the one end surface 31b of the base block 31 to the other end surface 31c. The lid groove 34 has a constant cross section with a rectangular cross section. The lid groove 34 includes a bottom surface 34a and side walls 34b and 34b rising from the bottom surface 34a.

  The concave groove 35 extends along the bottom surface 34a of the lid groove 34 and opens to the bottom surface 34a. The concave groove 35 is formed continuously from one end surface 31b of the base block 31 to the other end surface 31c. The concave groove 35 has a constant cross section with a U-shaped cross section. The depth of the concave groove 35 is substantially equal to the outer diameter of the heat medium pipe P. The width of the concave groove 35 is substantially equal to the outer diameter of the heat medium pipe P. Further, the curvature radius of the bottom surface of the concave groove 35 is equal to the curvature radius of the outer diameter of the heat medium pipe P. In the present embodiment, the base block 31 is formed by extrusion molding. However, the base block 31 may be formed by cutting a rectangular parallelepiped block.

  The lid plate 33 has a rectangular parallelepiped shape. The material of the lid plate 33 is not particularly limited, but is preferably the same material as the base block 31. The lid plate 33 is shaped to be inserted into the lid groove 34 without any gap.

  In the radiator manufacturing method according to the second embodiment, a preparation process and a cutting process are performed. In the preparation process, an insertion process, a cover plate arrangement process, and a joining process are performed. As shown in FIG. 8, in the insertion step, the heat medium pipe P is inserted into the concave groove 35. The outer peripheral surface of the heat medium pipe P and the bottom surface (curved surface) of the concave groove 35 are in surface contact with each other by the insertion process.

  In the lid plate arranging step, the lid plate 33 is arranged in the lid groove 34. As illustrated in FIG. 8, the side surface 23 c of the lid plate 33 and the side wall 34 b of the lid groove 34 are abutted by the lid plate arranging step to form a butted portion J <b> 1, and the side surface 23 d of the lid plate 33 and the side wall of the lid groove 34 are formed. 34b is abutted to form a butted portion J2. Further, the lower surface 33b of the cover plate 33 and the heat medium pipe P are in contact with each other, and the surface 33a of the cover plate 33 and the surface 31a of the base block 31 are flush with each other.

  By the cover plate arranging step, gaps Q and Q are formed around the heat medium pipe P. That is, the gap Q is a space formed by the outer peripheral surface of the heat medium pipe P, the lower surface 33 b of the cover plate 33, and the concave groove 35.

  In the joining step, the abutting portions J1 and J2 are friction stir welded with the rotary tool G as shown in FIGS. The rotary tool G includes a columnar shoulder portion G1 and a stirring pin G2 that hangs down from the lower end surface of the shoulder portion G1. The stirring pin G2 has a truncated cone shape. A spiral groove (not shown) is formed around the stirring pin G2.

  In the joining process, the rotary tool G is inserted at the start position SP1 set on the abutting portion J1, and the rotating tool G is relatively moved along the abutting portion J1. A plasticized region W1 is formed in the movement locus of the rotary tool G. When the rotary tool G reaches the end position EP1, the rotary tool is detached from the base block 31. As shown in FIG. 9B, in the joining step, the lower end surface of the shoulder portion G1 of the rotary tool G is pushed into the surface 31a of the base block 31 by several millimeters to perform frictional stirring. The insertion depth of the rotary tool G is set so that the plastic fluidized material plasticized by friction stirring flows into the gap Q.

  When the friction stir of the butt portion J1 is completed, the friction stir welding is performed on the butt portion J2 in the same procedure as the butt portion J1. A plasticized region W2 is formed in the butt portion J2. The block 30 to be cut is formed by the above steps.

  In addition, although the through hole of the stirring pin G2 is formed in end position EP1, EP2 in a joining process, you may perform the repair process which repairs the said through hole by performing overlay welding.

  The cutting step is a step of cutting the block 30 to be cut using the multi-cutter 20 to form the fins 3. Since the cutting process is the same as that of the first embodiment or the modification of the first embodiment, detailed description thereof is omitted. As shown in FIG. 9 (a), since both ends of the block 30 to be cut remain unfrictioned, cutting margins R1 and R1 are provided, and the inside of the cutting margins R1 and R1 is cut to obtain the fin 3 Is preferably formed.

  The method for manufacturing a radiator according to the second embodiment described above can also provide substantially the same effect as the first embodiment. Moreover, according to 2nd embodiment, the to-be-cut block 30 with which the pipe | tube P for heat media was embed | buried can be manufactured easily. Further, in the joining process, the rotating tool G is pushed into the base block 31 and the cover plate 33 to perform frictional stirring, whereby the heat medium pipe P is pressed by the cover plate 33 and the bottom surface of the groove 35 and the heat medium use. The outer peripheral surface of the tube P can be brought into close contact with each other, or can be brought into contact with almost no gap. Further, the plastic fluidizing material can be caused to flow into the gap Q formed around the heat medium pipe P, and the gap Q can be filled with the metal material. Thereby, the thermal conductivity of a radiator can be improved.

  Further, by using an extruded shape of aluminum or aluminum alloy as the base block 31, it is possible to reduce the weight and improve the formability in the cutting process. Moreover, since it is an extrusion shape material, a member can be procured cheaply and easily.

  In the present embodiment, one cover plate 33 is used. However, when the heat medium pipe P is embedded at a deep position of the base block 31, a plurality of cover grooves having different widths are provided, and each cover groove is provided. You may provide the cover plate arrange | positioned in. In this case, a joining process may be performed for each cover plate, and friction stir welding may be performed on the butt portion.

[Third embodiment]
Next, a radiator and a method for manufacturing the radiator according to the third embodiment will be described. As shown in FIG. 10, the radiator 1 </ b> B according to the third embodiment includes a heat medium pipe P, a base 42, and fins 43. The radiator 1B is different from the first embodiment in that the fins 43 are formed on the upper and lower portions of the radiator 1B, respectively.

  The base 42 has a substantially rectangular parallelepiped shape, and the heat medium pipe P passes through the center 42. The base 42 is solid except for the heat medium pipe P. The entire circumferential direction of the outer peripheral surface of the heat medium pipe P is in close contact with the base portion 42 or is substantially in contact with no gap.

  The fins 43 are erected vertically above the base portion 42. Further, the fins 43 are arranged so as to be perpendicular to the central axis C. The plurality of fins 43 are arranged in parallel at equal intervals, and are formed on both sides with the base 42 interposed therebetween. The upper fin 43 and the lower fin 43 have the same height. The height dimension of the fin 43 is about 1/3 of the total height of the radiator 1B.

  In the radiator manufacturing method according to the third embodiment, a preparation process and a cutting process are performed. In the preparation step, as shown in FIG. 11A, the cutting block 10 similar to that of the first embodiment is prepared, and the cutting block 10 is fixed to the gantry K so as not to move.

  In the cutting process, the multi-cutter 20 is made to enter the block to be cut 10 to form the fins 43. Specifically, the center axis C of the heat medium pipe P and the rotation axis (rotation center axis) 21 of the multi-cutter 20 are arranged in parallel, and the disk cutter 22 is placed on the upper ridge line 14a, while maintaining this parallelism. Insert into one of 14a. The disk cutter 22 may be inserted from above the one ridge line 14a in the vertical direction, or may be inserted obliquely as shown in FIG. When the disk cutter 22 is inserted to the cutting depth d, the multi-cutter 20 is relatively moved linearly toward the other ridge line 14a while maintaining the cutting depth d. The dimension of the cutting depth d may be set as appropriate so that the heat medium pipe P and the disk cutter 22 do not contact each other.

  When the multi-cutter 20 is moved to a position where the rotary shaft 21 and the other ridge line 14a overlap each other on the vertical line, the multi-cutter 20 is detached from the block 10 to be cut. The multi-cutter 20 may be detached in any of the horizontal direction, the vertical direction, and the diagonally upward direction. The heat sink 1B is completed by turning over the block 10 to be cut and performing the same cutting process on the side surface 14 facing the side surface 14 on which the fins 43 are formed.

  According to the method for manufacturing a radiator according to the third embodiment described above, the radiator 1B in which the heat medium pipe P, the base portion 42, and the fins 43 are integrally formed can be manufactured. Moreover, in this embodiment, since only the multi-cutter 20 is moved linearly, the heat radiator 1B can be manufactured easily.

  The fins 43 may be formed on the entire surface of the block 10 by inserting the multi-cutter 20 into all four side surfaces 14 of the block 10 to be cut. Moreover, you may perform the manufacturing method of the heat radiator which concerns on 3rd embodiment using the to-be-cut block 30 which concerns on 2nd embodiment.

[Fourth embodiment]
Next, a radiator and a method for manufacturing the radiator according to the fourth embodiment of the present invention will be described. As shown in FIG. 12, the radiator 1 </ b> C according to the fourth embodiment includes a heat medium pipe P, a base 42, and fins 43. 1 C of heat radiators differ in the orientation direction of the fin 43 from 3rd embodiment.

  The base 42 has a substantially rectangular parallelepiped shape, and the heat medium pipe P passes through the center 42. The base 42 is solid except for the heat medium pipe P. The entire circumferential direction of the outer peripheral surface of the heat medium pipe P is in close contact with the base portion 42 or is substantially in contact with no gap.

  The fins 43 are erected vertically above the base portion 42. Further, the fins 43 are arranged in parallel with the central axis C. The fins 43 are arranged in parallel at equal intervals, and are formed on both sides of the base 42. The upper fin 43 and the lower fin 43 have the same height. The height dimension of the fin 43 is about 1/3 of the overall height dimension of the radiator 1C.

  In the radiator manufacturing method according to the fourth embodiment, a preparation process and a cutting process are performed. The preparation process is the same as in the third embodiment.

  The cutting process is a process of forming the fins 43 by inserting the multi-cutter 20 into the block 10 to be cut as shown in FIG. In the cutting process, the multi-cutter 20 is arranged so that the plane whose normal is the central axis C of the heat medium pipe P and the plane whose normal is the rotation central axis of the rotary shaft 21 are arranged to be cut. The multi-cutter 20 is inserted into one of the ridge lines 14d and 14d on the upper side of the block 10. When the disk cutter 22 is inserted to the cutting depth d, the multi-cutter 20 is relatively moved linearly toward the other ridge line 14d while maintaining the cutting depth d. The dimension of the cutting depth d may be set as appropriate so that the heat medium pipe P and the disk cutter 22 do not contact each other.

  When the multi-cutter 20 is moved to a position where the center of the rotating shaft 21 and the other ridge line 14d overlap each other on the vertical line, the multi-cutter 20 is detached from the block 10 to be cut. The multi-cutter 20 may be detached in any of the horizontal direction, the vertical direction, and the diagonally upward direction. The heat sink 1C is completed by turning over the block 10 to be cut and performing the same cutting process on the side surface 14 facing the side surface 14 on which the fins 43 are formed.

  According to the method for manufacturing a radiator according to the fourth embodiment described above, the radiator 1C in which the heat medium pipe P, the base portion 42, and the fins 43 are integrally formed can be manufactured. Moreover, since the multi-cutter 20 is only moved linearly, the radiator 1C can be easily manufactured. In addition, you may perform the manufacturing method of the heat radiator which concerns on 4th embodiment using the to-be-cut block 30 which concerns on 2nd embodiment.

  Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, in the present embodiment, the block 10 to be cut which has a rectangular parallelepiped in appearance is used, but the block to be cut may have a cylindrical shape or other polygonal column shape.

  Further, in the preparation process, the cutting process may be performed after hardening the block 10 by performing an aging treatment by heating an aluminum alloy shaped material at about 200 degrees. By age-hardening the block 10 to be cut, cutting can be easily performed during the cutting process. Further, the strength of the fin 3 can be improved.

DESCRIPTION OF SYMBOLS 1 Radiator 2 Base 3 Fin 10 Block to be cut 11 Base block 12 One end surface 13 The other end surface 14 Side 14a Ridge line 14d Ridge line 20 Multi cutter 21 Rotating shaft 22 Disc cutter C Central axis (central axis of heat medium pipe P)
d Cutting depth t Distance P Heat medium pipe

Claims (2)

A straight heat medium pipe through which a fluid flows, a metal base that is separate from the heat medium pipe and that contacts the outer peripheral surface of the heat medium pipe, and is integrally formed with the base. A plurality of flat fins having a rectangular shape arranged around the heat medium pipe at intervals, and
The fins are juxtaposed perpendicular to the axial direction of the heat medium pipe, and extend in a direction away from the heat medium pipe on the entire circumference of the heat medium pipe,
The base and the fin are made of aluminum or an aluminum alloy, and the heat medium pipe is made of copper or a copper alloy. A straight heat medium pipe through which a fluid flows, a metal base part that is separate from the heat medium pipe and is in contact with the outer peripheral surface of the heat medium pipe, and are integrally formed with the base part and spaced apart from each other. A plurality of flat fins presenting side-by-side rectangles;
The fins are juxtaposed perpendicularly to or parallel to the axial direction of the heat medium pipe,
The plurality of fins are formed at positions facing both sides across the heat medium pipe,
The base and the fin are made of aluminum or an aluminum alloy, and the heat medium pipe is made of copper or a copper alloy.

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