JP2019158334A - Heat exchanger - Google Patents

Abstract

To provide a heat exchanger with high heat conductivity.SOLUTION: A heat exchanger 1 with a hollow extrusion-shaped material 2 comprises a frame-like main body part 10 formed of a pair of opposite first outer wall part 21 and second outer wall part 22, and a plurality of first partition walls 11 connecting the first outer wall part 21 and the second outer wall part 22 to each other, wherein a heat medium pipe 4 is embedded in at least one of the pair of first outer wall part 21 and second outer wall part 22. It is preferable that the heat medium pipe 4 is embedded at a position corresponding to the first partition wall 11. According to this configuration, heat conductivity can be enhanced.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a heat exchanger.

  Patent Document 1 discloses a method for manufacturing a heat exchanger having a plurality of hollow portions. In the heat exchanger manufacturing method, a lower wall and an upper wall on which a plurality of pins (fins) are formed are brazed to form a hollow portion through which a refrigerant flows.

JP-A-8-178567

  The conventional technique has a problem that the brazing work becomes complicated. Moreover, since it joins via a brazing material, there exists a problem that heat conductivity falls.

  From such a viewpoint, this invention makes it a subject to provide a heat exchanger with high heat conductivity.

  In order to solve such a problem, the present invention is a hollow provided with a frame-shaped main body formed including a pair of opposed outer wall portions, and a plurality of partition walls connecting the outer wall portions to each other. A heat exchanger including an extruded profile, characterized in that a heat medium pipe is embedded in at least one of the pair of outer wall portions.

  According to this configuration, the thermal conductivity can be increased.

  Further, it is preferable that the heat medium pipe is embedded at a position corresponding to the partition wall. According to this configuration, the thermal conductivity can be further increased.

  According to the heat exchanger according to the present invention, the thermal conductivity can be increased.

It is a perspective view of the heat exchanger which concerns on 1st embodiment of this invention. It is sectional drawing of the heat exchanger which concerns on 1st embodiment. It is sectional drawing which shows the extrusion molding process of the manufacturing method of the heat exchanger which concerns on 1st embodiment. It is sectional drawing which shows the insertion process and lid groove block | close process of the manufacturing method of the heat exchanger which concerns on 1st embodiment. It is sectional drawing which shows the friction stirring process of the manufacturing method of the heat exchanger which concerns on 1st embodiment. It is sectional drawing which shows the friction stirring process after the manufacturing method of the heat exchanger which concerns on 1st embodiment. It is sectional drawing which shows the modification of the manufacturing method of the heat exchanger which concerns on 1st embodiment. It is sectional drawing of the heat exchanger which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the extrusion molding process of the manufacturing method of the heat exchanger which concerns on 2nd embodiment. It is sectional drawing which shows the insertion process and the ditch | groove obstruction | occlusion process of the manufacturing method of the heat exchanger which concerns on 2nd embodiment. It is sectional drawing which shows the friction stirring process of the manufacturing method of the heat exchanger which concerns on 2nd embodiment.

[First embodiment]
A heat exchanger and a heat exchanger manufacturing method according to a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the heat exchanger 1 according to the present embodiment is mainly configured by a hollow extruded shape member 2, a plurality of cover plates 3, and a plurality of heat medium tubes 4. A plurality of hollow portions K are formed inside the hollow extruded shape member 2. The end of the heat medium pipe 4 is exposed from the side of the hollow extruded profile 2. The heat exchanger 1 is a device that performs heat exchange between a fluid (liquid or gas) flowing through the heat medium pipe 4 and a fluid flowing through the hollow portion K.

  As shown in FIG. 2, the heat medium pipe 4 is embedded in the hollow extruded shape member 2 by the cover plate 3. The butted portion between the hollow extruded shape member 2 and the cover plate 3 is joined by friction stirring. In other words, plasticized regions W1 and W2 are formed at the butted portions of the hollow extruded shape member 2 and the cover plate 3, respectively.

  Next, the manufacturing method of the heat exchanger which concerns on this embodiment is demonstrated. The manufacturing method of the heat exchanger according to the present embodiment performs an extrusion process, an insertion process, a lid groove closing process, and a friction stirring process. In the following description, “front surface” means a surface opposite to the “back surface”.

  As shown in FIG. 3, the extrusion molding step is a step of molding the hollow extruded shape member 2 by extrusion molding. The hollow extruded shape member 2 is preferably formed of a metal having high thermal conductivity. In the present embodiment, the hollow extruded shape member 2 is formed of aluminum or an aluminum alloy. The hollow extruded shape member 2 is mainly composed of a frame-shaped main body 10, a plurality of first partition walls 11, and a plurality of second partition walls 12.

  The frame-shaped main body portion 10 includes a first outer wall portion 21, a second outer wall portion 22, a third outer wall portion 23, and a fourth outer wall portion 24, and has a substantially rectangular frame shape when viewed from the front. The first outer wall portion 21 and the second outer wall portion 22 face each other, and the third outer wall portion 23 and the fourth outer wall portion 24 face each other. A lid groove 13 is formed on the surface 21a of the first outer wall portion 21 with a predetermined interval. The lid groove 13 has a rectangular shape in cross section, and is a part where the lid plate 3 is arranged with almost no gap. The number of lid grooves 13 is not particularly limited, but is five in this embodiment. A concave groove 14 is formed on the bottom surface 13 a of each lid groove 13.

  The concave groove 14 includes an arc-shaped bottom surface 14a and side walls 14b and 14b continuous to the bottom surface 14a. The depth of the concave groove 14 is substantially equal to the diameter of the heat medium pipe 4. The curvature radius of the bottom surface 14 a is equal to the curvature radius of the heat medium pipe 4. Each lid groove 13 and each concave groove 14 are formed on an extension line of the first partition wall 11. On the surface 22 a of the second outer wall portion 22, similarly to the first outer wall portion 21, a lid groove 13 and a concave groove 14 are formed at positions corresponding to the first partition wall 11.

  The third outer wall portion 23 and the fourth outer wall portion 24 are members that connect both ends of the first outer wall portion 21 and the second outer wall portion 22, respectively. The first partition wall 11 connects the first outer wall portion 21 and the second outer wall portion 22, and a plurality of the first partition walls 11 are arranged in parallel at a predetermined interval. The number of the first partition walls 11 is not particularly limited, but five bodies are formed in the present embodiment. The first partition wall 11 is perpendicular to the first outer wall portion 21 and the second outer wall portion 22. The plate thickness of the first partition wall 11 is not particularly limited, but is preferably a plate thickness dimension such that the hollow portion K is not deformed by the pressing force applied by the rotary tool G in the friction stirring step described later.

  The second partition wall 12 is a wall that connects the first outer wall portion 21 and the second outer wall portion 22 and obliquely separates the hollow portion K, and a plurality of the second partition walls 12 are arranged in parallel. The second partition wall 12 connects one end side of the first partition wall 11 to the other end side of the adjacent first partition wall 11. Although the number in particular of the 2nd partition 12 is not restrict | limited, 4 bodies are arranged in parallel by this embodiment. A space formed by the frame main body 10, the first partition 11, and the second partition 12 is a hollow portion K.

  The insertion step is a step of inserting the heat medium pipe 4 into each concave groove 14 as shown in FIG. The heat medium pipe 4 is a portion serving as a flow path through which a fluid flows, and has a cylindrical shape in the present embodiment. The heat medium pipe 4 is preferably formed of a metal having high thermal conductivity, and is made of copper in this embodiment. Note that a heater tube with a built-in heater may be used as the heat medium tube 4.

  The lid groove closing step is a step of placing the lid plate 3 in the lid groove 13. The lid plate 3 is a plate-like member having a rectangular cross section, and is disposed in the lid groove 13 with almost no gap. The lid plate 3 is preferably made of a metal having high thermal conductivity, and in this embodiment, the lid plate 3 is made of an aluminum alloy or aluminum. The back surface 3c of the cover plate 3 is disposed in contact with the upper end of the heat medium pipe 4 or with a slight gap. The side surfaces 3b, 3b of the lid plate 3 and the side walls 13b, 13b of the lid groove 13 are abutted to form abutting portions J1, J2. Gaps Q1 and Q2 are formed around the heat medium pipe 4. The gap portions Q <b> 1 and Q <b> 2 are spaces formed by the outer peripheral surface of the heat medium pipe 4, the side wall 14 b of the concave groove 14, and the back surface 3 c of the lid plate 3.

  As shown in FIG. 5, the friction stir process is a process in which friction stir welding is performed on each of the butted portions J <b> 1 and J <b> 2 using a rotary tool G. The rotary tool G includes a shoulder portion G1 and a stirring pin G2. The shoulder portion G1 has a cylindrical shape. The stirring pin G2 hangs down from the lower end surface of the shoulder portion G1, and is tapered. A spiral groove (not shown) is formed on the outer peripheral surface of the stirring pin G2.

  In the friction stirring step, the lower end surface of the shoulder portion G1 is pushed into the surface 3a of the cover plate 3 and the surface 21a of the first outer wall portion 21 while inserting the stirring pin G2 of the rotating tool G rotated into the butting portion J1. Then, the rotary 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. The insertion depth of the stirring pin G2 is set so that the plastic fluidized material fluidized by frictional heat flows into at least the gap portion Q1. In the present embodiment, the insertion depth of the stirring pin G2 is set so that the stirring pin G2 reaches the gap portion Q1.

  In the friction agitation term process, friction agitation welding is performed on the butt portion J2 in the same manner as the butt portion J1. A plasticizing region W2 is formed in the butt portion J2 by the movement locus of the rotary tool G. In addition, the plastic fluidized material plasticized by frictional heat is also introduced into the gap Q2. As shown in FIG. 6, the abutting portions J1 and J2 are joined by the friction stirring step, and the gap portions Q1 and Q2 are filled with the plastic fluid material. In the friction stir process, the hollow extruded shape member 2 and each cover plate 3 are friction stir welded in the same manner. Thereby, the heat exchanger 1 is formed. In addition, you may perform the burr | flash removal process which removes the burr | flash which generate | occur | produced in the friction stirring process after a friction stirring process is complete | finished.

  According to the method for manufacturing a heat exchanger according to the present embodiment described above, a plurality of hollow portions K including the frame-shaped main body portion 10, the first partition wall 11, and the second partition wall 12 are provided by extrusion molding. A hollow extruded profile 2 is formed. Thereby, the heat exchanger 1 can be formed easily. Further, since it can be formed without using a brazing material or an adhesive, the heat exchanger 1 having high thermal conductivity can be manufactured.

  Moreover, since the concave groove 14 is formed at a position corresponding to the first partition wall 11, the pressing force acting by the rotary tool G during the friction stirring process can be supported by the first partition wall 11. Thereby, it can prevent that the hollow part K deform | transforms. Moreover, in this embodiment, since the pressing force which acts with the rotation tool G can be supported also by the 2nd partition 12, the deformation | transformation of the hollow part K can be prevented more.

  Further, in the friction stirring step, the pressing force of the shoulder G1 of the rotary tool G is transmitted to the heat medium pipe 4 through the cover plate 3, and the friction stir is performed while pressing the heat medium pipe 4 against the bottom surface 14a of the groove 14. I do. Thereby, since the bottom face 14a of the ditch | groove 14 and the heat medium pipe | tube 4 are closely_contact | adhered, thermal conductivity can be raised more.

  In the friction stirring step, since the plastic fluidized material fluidized by frictional heat flows into the gaps Q1 and Q2 formed around the heat medium pipe 4, the gaps Q1 and Q2 are made of plastic fluid. Filled. Thereby, the heat conductivity of the heat exchanger 1 can be improved more.

[Modification]
Next, a modification of the first embodiment will be described as shown in FIG. The modification differs from the first embodiment in that the second partition 12 is omitted. A heat exchanger 1 </ b> A according to the modified example is mainly configured by a hollow extruded shape member 2, a plurality of cover plates 3, and a plurality of heat medium tubes 4. In the hollow extruded shape member 2, the second partition wall 12 used in the first embodiment is omitted, and the frame-shaped main body portion 10 and the first partition wall 11 constitute a plurality of hollow portions K. The concave groove 14 is formed at a position corresponding to the first partition wall 11. Since the structure and manufacturing method of the heat exchanger 1A according to the modification are the same as those of the first embodiment except that the second partition wall 12 is omitted, detailed description thereof is omitted. Also by the manufacturing method of the heat exchanger 1A according to the second embodiment, substantially the same effect as the first embodiment can be obtained.

[Second Embodiment]
Next, the manufacturing method of the heat exchanger which concerns on 2nd embodiment is demonstrated. As shown in FIG. 8, the heat exchanger 1 </ b> B according to the present embodiment is mainly configured by a hollow extruded shape member 42, a plurality of lid plates 43, and a plurality of heat medium tubes 4. A plurality of hollow portions K are formed inside the hollow extruded shape member 42. The heat exchanger 1B is a device that performs heat exchange between the fluid flowing in the heat medium pipe 4 and the fluid flowing in the hollow portion K. The heat exchanger 1B is different from the first embodiment in that one plasticized region W1 is formed with respect to the cover plate 43.

  As shown in FIG. 8, the heat medium pipe 4 is embedded in the hollow extruded shape member 42 by the cover plate 3. The abutting portion between the hollow extruded shape member 42 and the lid plate 43 is joined by friction stirring. More specifically, the pair of butted portions of the hollow extruded shape member 42 and the lid plate 43 are joined at a single plasticized region W1.

  Next, the manufacturing method of the heat exchanger which concerns on this embodiment is demonstrated. The manufacturing method of the heat exchanger which concerns on this embodiment performs an extrusion molding process, an insertion process, a ditch | groove obstruction | occlusion process, and a friction stirring process.

  As shown in FIG. 9, the extrusion molding process is a process of molding the hollow extruded shape member 42 by extrusion molding. The hollow extruded shape member 42 is preferably formed of a metal having high thermal conductivity, and is formed of aluminum or an aluminum alloy in the present embodiment. The hollow extruded shape member 42 is mainly composed of a frame-shaped main body 50, a plurality of first partition walls 51, and a plurality of second partition walls 52.

  The frame-shaped main body 50 includes a first outer wall 61, a second outer wall 62, a third outer wall 63, and a fourth outer wall 64, and has a substantially rectangular frame shape when viewed from the front. The first outer wall portion 61 and the second outer wall portion 62 are opposed to each other, and the third outer wall portion 63 and the fourth outer wall portion 64 are opposed to each other. Concave grooves 54 are formed in the surface 61a of the first outer wall portion 61 at a predetermined interval. Although the number of the concave grooves 54 is not particularly limited, four grooves are formed in the present embodiment.

  The concave groove 54 includes an arc-shaped bottom surface 54a and side walls 54b and 54b continuous to the bottom surface 54a. The depth dimension of the concave groove 54 is slightly smaller than the sum of the diameter of the heat medium pipe 4 and the height dimension of the lid plate 43. The width of the concave groove 54 is equal to the diameter of the heat medium pipe 4. The curvature radius of the bottom surface 54 a is equal to the curvature radius of the heat medium pipe 4. Each concave groove 54 is formed on an extension line of the first partition wall 51. On the surface 62 a of the second outer wall portion 62, similarly to the first outer wall portion 61, concave grooves 54 are respectively formed at positions corresponding to the first partition walls 51.

  The third outer wall portion 63 and the fourth outer wall portion 64 are members that connect both ends of the first outer wall portion 61 and the second outer wall portion 62. The first partition wall 51 connects the first outer wall portion 61 and the second outer wall portion 62, and a plurality of the first partition walls 51 are arranged in parallel at a predetermined interval. The first partition wall 51 is perpendicular to the first outer wall portion 61 and the second outer wall portion 62. The plate thickness of the first partition wall 51 is not particularly limited, but is preferably a plate thickness dimension such that the hollow portion K is not deformed by the pressing force applied by the rotary tool G in the friction stirring step described later.

  The second partition walls 52, 52 are walls that connect the first outer wall portion 61 and the second outer wall portion 62 and obliquely separate the hollow portion K, and are formed in a plurality. The second partition walls 52, 52 are arranged in an X shape in front view so as to cross each other. A space formed by the frame-shaped main body 50, the first partition wall 51, and the second partition wall 52 becomes the hollow portion K. In the heat exchanger 1B according to the second embodiment, the second partition 52 may be omitted.

  The inserting step is a step of inserting the heat medium pipe 4 into each concave groove 54 as shown in FIG. The concave groove closing step is a step of disposing the cover plate 43 on the heat medium pipe 4. The lid plate 43 is a plate-like member having a rectangular cross section, and is disposed in the concave groove 54 with almost no gap. When the cover plate 43 is disposed on the heat medium pipe 4, the surface 43 a of the cover plate 43 slightly protrudes above the surface 61 a of the first outer wall portion 61.

  The side surfaces 43b, 43b of the cover plate 43 and the side walls 54b, 54b of the groove 54 are abutted to form abutting portions J1, J2. Gaps Q1 and Q2 are formed around the heat medium pipe 4. The gaps Q <b> 1 and Q <b> 2 are spaces configured by the outer peripheral surface of the heat medium pipe 4, the side wall 54 b of the concave groove 54, and the back surface 43 c of the lid plate 43.

  As shown in FIG. 11, the friction stir process is a process of performing friction stir welding to the butted portions J <b> 1 and J <b> 2 using a rotary tool G. The rotary tool G includes a shoulder portion G1 and a stirring pin G2. The shoulder portion G1 has a cylindrical shape. In the present embodiment, the diameter of the shoulder portion G1 is set to be larger than the width of the concave groove 54. The stirring pin G2 hangs down from the lower end surface of the shoulder portion G1, and is tapered. A spiral groove is formed on the outer peripheral surface of the stirring pin G2.

  In the friction stirring step, the lower end surface of the shoulder portion G1 is pushed into the surface 61a of the first outer wall portion 61 while inserting the stirring pin G2 of the rotating tool G rotated at the center of the surface 43a of the lid plate 43. Then, the rotary tool G is relatively moved along the abutting portions J1 and J2. A plasticized region W1 is formed in the movement locus of the rotary tool G. That is, in the friction stirring process, the abutting portions J1 and J2 are simultaneously friction stir welded in one pass using the rotary tool G.

  In the friction stirring term step, the hollow extruded shape member 42 and each cover plate 43 are friction stir welded in the same manner. Thereby, the heat exchanger 1B is formed. In addition, you may perform the burr | flash removal process which removes the burr | flash which generate | occur | produced in the friction stirring process after a friction stirring process is complete | finished.

  According to the method for manufacturing a heat exchanger according to the present embodiment described above, a plurality of hollow portions K including the frame-shaped main body portion 50, the first partition wall 51, and the second partition wall 52 are provided by extrusion molding. A hollow extruded profile 42 is formed. Thereby, the heat exchanger 1B can be formed easily. Moreover, since it can form without interposing a brazing material or an adhesive agent, the heat exchanger 1B with high heat conductivity can be manufactured.

  Further, since the concave groove 54 is formed at a position corresponding to the first partition 51, the pressing force acting by the rotary tool G during the friction stirring process can be supported by the first partition 51. Thereby, it can prevent that the hollow part K deform | transforms. Moreover, in this embodiment, since the pressing force which acts with the rotary tool G can be supported also by the 2nd partition walls 52 and 52, a deformation | transformation of the hollow part K can be prevented more.

  Further, in the friction stirring step, the pressing force of the shoulder G1 of the rotary tool G is transmitted to the heat medium tube 4 through the cover plate 43, and the friction medium is pressed while pressing the heat medium tube 4 against the bottom surface 54a of the groove 54. I do. Thereby, since the bottom face 54a of the concave groove 54 and the heat medium pipe 4 are in close contact with each other, the thermal conductivity can be further increased.

  Further, in the friction stirring step, the rotating tool G is inserted into the lid plate 43 with the surface 43a of the lid plate 43 projecting from the surface 61a of the first outer wall portion 61. be able to.

  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 groove and the partition are provided at corresponding positions, but the groove may be provided at a position that does not correspond. In the present embodiment, the heat medium pipe 4 is embedded in both surfaces of the first outer wall part and the second outer wall part. However, at least one of the first outer wall part and the second outer wall part is used for the heat medium. It is good also as a structure which embeds the pipe | tube 4. FIG. In the second embodiment, the friction stirring step may be performed in a state where the surface 61a of the first outer wall portion 61 and the surface 43a of the lid plate 43 are flush with each other.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Hollow extrusion profile 3 Cover plate 4 Heat medium pipe 11 1st partition (partition)
12 Second partition (partition)
13 Lid groove 14 Concave groove 21 First outer wall (outer wall)
22 Second outer wall (outer wall)
23 3rd outer wall part 24 4th outer wall part G Rotating tool G1 Shoulder part G2 Stirring pin J1 Butting part J2 Butting part Q1 Gap part Q2 Gap part

Claims (2)

  A heat exchanger comprising a hollow extruded section comprising a frame-shaped main body formed including a pair of opposed outer wall portions, and a plurality of partition walls connecting the outer wall portions and arranged in parallel. A heat exchanger having a heat medium pipe embedded in at least one of the pair of outer wall portions.   The heat exchanger according to claim 1, wherein the heat medium pipe is embedded at a position corresponding to the partition wall.

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