JP2017156042A - Heat exchanger and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger in which a binding tool is not connected (fastened) to a brazed assembly, and a manufacturing method thereof.SOLUTION: A heat exchanger configured to exchange heat between fluids flowing inside and outside a tube 11 through a fin 15, includes an assembly 10 in which a plurality of tubes 11 and fins 15 are laminated, and a side plate 20 provided on an outermost layer of the assembly 10. The side plate 20, the tubes 11 and the fins 15 are connected. The side plate 20 has a tabular plate part 23 holding the fin 15 between the tubes 11, and a folding part 21 projecting from the plate part 23 in a lamination direction and facing an opening end 16 of the fin 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat exchanger and a manufacturing method thereof.

  Patent Document 1 discloses a heat exchanger used as a condenser for a car cooler. The heat exchanger includes an assembly in which a plurality of tubes and fins are stacked between a pair of side members.

  The assembly is bound by a band (binding tool) in a state where the side members, tubes, and fins are stacked. In this state, the assembly is brought into a heating furnace and heated to be brazed. A brazing material is applied to the tube or the like in advance.

JP-A-6-7871

  However, when the assembly is brazed, since the band is in contact with the tube or the fin, a part of the tube or the fin may be bonded (fixed) to the band.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a heat exchanger that prevents a binding tool from joining (adhering) to a brazed assembly and a method for manufacturing the same.

  According to an aspect of the present invention, there is provided a heat exchanger in which fluids flowing in and out of a tube exchange heat via fins, the assembly including a plurality of the tubes and the fins stacked together, and an outermost part of the assembly. A side plate provided in an outer layer, and joining the side plate, the tube, and the fin, and the side plate includes a plate-like plate portion that sandwiches the fin between the tube and the plate portion. There is provided a heat exchanger having a bent portion protruding in the stacking direction and facing the opening end of the fin.

  Further, according to an aspect of the present invention, there is provided a method of manufacturing a heat exchanger in which fluids flowing inside and outside of a tube exchange heat via fins, wherein a plurality of the tubes and fins are stacked. A side plate is provided on the outer layer, and the side plate includes a plate-like plate portion that sandwiches the fin between the tube, and a bent portion that protrudes from the plate portion in the stacking direction and faces the opening end of the fin. , And the side plate, the tube, and the fin are joined together.

  According to the above aspect, when the assembly in which the fins and the tube are laminated is brazed in a state of being bound by the binding tool, by bringing the binding tool into contact with the plate portion and the bent portion of the side plate, It becomes possible to prevent the binding tool from coming into contact with the fin and the tube. This prevents the binding tool from being bonded (fixed) to the fin or tube.

FIG. 1 is a perspective view showing an assembly of a heat exchanger according to an embodiment of the present invention. FIG. 2 is a bottom view showing the assembly. 3A, 3B, and 3C are a bottom view, a side view, and a front view, respectively, showing a side plate.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 and 2 show a heat exchanger assembly 10 (core assembly) according to an embodiment of the present invention.

  The assembly 10 includes a plurality of tubes 11, fins 15 stacked alternately with the tubes 11, a pair of side plates 20 disposed in the outermost layer, and both open end portions 12 of the tubes 11. And a pair of tank plates 30 connected side by side.

  In the assembly 10, the members 11, 15, 20, and 30 that are stacked and assembled are brazed. A vessel-shaped tank body (not shown) is assembled to the tank plate 30 joined to the assembly 10. Thus, the heat exchanger is provided with a pair of tanks formed by the tank plate 30 and the tank body.

  When the heat exchanger is operated, heat exchange is performed between the medium flowing from one tank to the other tank through each tube 11 and the air flowing outside each tube 11 via the fins 15.

  The flat cylindrical tube 11 is formed by extruding a molten metal material such as aluminum. The tube 11 is not limited to this, and may be formed by bending a metal plate into a cylindrical shape.

  Hereinafter, description will be made by setting three axes X, Y, and Z orthogonal to each other in each drawing. In the assembly 10, the X-axis direction in which the flow path in the tube 11 extends is referred to as “flow path direction”, the Y-axis direction in which the tubes 11 and the fins 15 are arranged is referred to as “stacking direction”, and the Z-axis direction is “ It is called “width direction”.

  The tube 11 forms a flow path extending in the X-axis direction. The tube 11 extends in the X-axis direction and the Z-axis direction in two planes 13, two width direction ends 14 extending in the X-axis direction and the Y-axis direction, and extends in the Y-axis direction and the Z-axis direction. And two open ends 12 that open.

  The tank plate 30, the fins 15, and the side plates 20 are formed by pressing a metal plate such as aluminum, for example.

  As shown in FIG. 1, a plurality of assembly holes 31 are opened in the plate-like tank plate 30 side by side in the stacking direction (Y-axis direction). The opening end 12 of each tube 11 is inserted into each assembly hole 31.

  The tank plate 30 has a plurality of crimping claws 32 at a portion where the tank body is assembled. The tank main body is formed of, for example, a resin material and is caulked and coupled to the tank plate 30 by the caulking claw portions 32.

  As shown in FIG. 2, the fin 15 is formed by bending a metal plate into a corrugated shape and has alternately crests and troughs. The fin 15 is joined to the side surface 13 of the tube 11 and extends in the width direction (Z-axis direction) to form an outer flow path through which air flows. The fin 15 has the same substantially rectangular outer shape as the side surface 13 of the tube 11. The fin 15 has two opening ends 16 extending in the flow direction (X-axis direction) and the stacking direction (Y-axis direction), and two flow direction ends 18 extending in the width direction (Z-axis direction).

  3A is a bottom view of the side plate 20, FIG. 3B is a side view of the side plate 20, and FIG. 3C is a front view of the side plate 20.

  The side plate 20 is bent from a plate-like plate portion 23 having a substantially rectangular outer shape and both flow path direction ends 28 (two sides extending in the Z-axis direction) of the plate portion 23 in the stacking direction (Y-axis direction). A plurality of (six) bent portions 21 (protruding portions) that protrude from the two flow direction end portions 24 projecting and the width direction end 27 (one side extending in the X-axis direction) of the plate portion 23 and project in the Y-axis direction. And).

  The flat plate portion 23 has the same outer shape as the fin 15 when viewed from the Y-axis direction. The plate portion 23 has two flow direction ends 28 extending in the width direction (Z-axis direction) and two width direction ends 27 extending in the flow direction (X-axis direction).

  The strip plate-like end portions 24 in the flow direction are bent from the respective flow direction ends 28 of the plate portion 23, and are formed so as to extend in substantially orthogonal directions (Y-axis direction and Z-axis direction) with respect to the plate portion 23. The

  The protrusion amount S (see FIG. 2) by which the channel direction end 24 protrudes from the plate portion 23 in the stacking direction (Y-axis direction) is smaller than the dimension (fin thickness) of the fins 15 in the stacking direction (Y-axis direction). Is set as follows. The flow direction end 24 faces the side surface 13 of the tube 11 with a gap. Thereby, even if a slight dimensional error occurs in the projecting amount S of the flow path direction end portion 24, the plate portion 23 is joined to the fin 15, and it is avoided that a gap is left between the plate portion 23 and the fin 15. The

  The side plate 20 is not limited to the above-described configuration, and the side plate 20 has an amount of protrusion S protruding in the stacking direction (Y-axis direction) of the flow path direction end 24 equal to the dimension of the fins 15 in the stacking direction (Y-axis direction). It may be set. In this case, in the side plate 20, the flow path direction end portion 24 is joined to the side surface 13 of the tube 11, and the plate portion 23 is joined to the fin 15. In this case, it is necessary to ensure the dimensional accuracy of the protrusion amount S so that there is no gap between the plate portion 23 and the fin 15.

  The bent portion 21 is bent so as to protrude from the end 27 in the width direction of the plate portion 23 in the stacking direction (Y-axis direction), and is formed in a plate shape extending in a direction substantially orthogonal to the plate portion 23 (X-axis direction and Y-axis direction). Is done. The bent portion 21 is formed so that the dimension in the flow path direction (X-axis direction) is smaller than that of the plate portion 23, and is formed in a claw shape that partially protrudes from the width direction end 27 of the plate portion 23. Thus, the assembly 10 is configured so that the bent portion 21 does not largely block the outer flow path formed between the side plate 20 and the fin 15.

  The protrusion amount T (see FIG. 2) that the bent portion 21 protrudes from the plate portion 23 in the stacking direction (Y-axis direction) is set larger than the dimension (height in the stacking direction) of the fins 15 in the stacking direction (Y-axis direction). Is done. Thereby, the bent portion 21 faces the opening end portion 12 of the fin 15 arranged on the outermost side in the stacking direction (Y-axis direction) and faces the width direction end portion 14 of the tube 11 adjacent to the fin 15. To do.

  The plate portion 23 is formed with a plurality of pairs of recesses 25 (notches) that open adjacent to the curved portion of the bent portion 21. As a result, the bent portion 21 is bent with a certain curvature from the front of the width direction end 27 as much as the concave portion 25 is opened. If the concave portion 25 is not formed, the bent portion 21 must be bent from the width direction end 27 and bent.

  When the side plate 20 is pressed, a plurality of side plates 20 are punched side by side from one metal plate. In the plate portion 23, the bent portion 21 protrudes from one width direction end 27, and the notch portion 22 opens at the other width direction end 27. The cutout portion 22 of a certain side plate 20 is formed at a site where the bent portion 21 of the adjacent side plate 20 is punched out. Similarly, in the plate portion 23, the concave portion 25 opens at one width direction end 27, and the convex portion 29 protrudes at the other width direction end 27. The concave portion 25 of a certain side plate 20 is formed at a portion where the convex portion 29 of the adjacent side plate 20 is punched out. In this way, since material that is wasted when the side plate 20 is pressed is reduced, the cost of manufacturing the side plate 20 can be suppressed.

  2, 3 </ b> A, and 3 </ b> C, O is a central plane that crosses the center of the assembly 10 in the flow path direction (X-axis direction) of the tube 11. The plurality (six) of bent portions 21 are arranged symmetrically with respect to the center plane O.

  The two bent portions 21 arranged on the outermost side in the flow path direction (X-axis direction) of the plate portion 23 are formed so as to be adjacent to and adjacent to each flow path direction end 28 of the plate portion 23 via the recess 25. Is done. The bent portion 21 faces the portion (the end portion in the left-right direction in FIG. 2) that is located on the outermost side of the opening end 16 of the fin 15 in the flow path direction (X-axis direction) of the plate portion 23.

  At the time of manufacturing the heat exchanger, an assembling process for assembling the tube 11, the fins 15, the side plate 20, and the tank plate 30, and conveying the assembled assembly 10 to a heating furnace (not shown) to braze each member. And a joining step for joining.

  For the tube 11 and the fin 15, a clad material to which a brazing material and a flux are applied in advance is used. The side plate 20 is not coated with a brazing material or the like.

  FIG. 1 shows an assembly 10 assembled through an assembly process. In the assembly 10, the stacked tubes 11, fins 15, and side plates 20 are bundled through a plurality (six) of bands 40 (binding tools).

  The band 40 is formed by bending a band-shaped metal spring plate. The band 40 includes a pedestal portion 41 on which the assembly 10 is placed, and a pair of pressing portions 42 that are bent from both ends of the pedestal portion 41 and abut against the side plate 20. The band 40 is elastically deformed and the distance between the pair of pressing portions 42 is increased, so that the operation of attaching and removing the band 40 to the assembly 10 can be easily performed.

  The band 40 is attached to the assembly 10 such that the pedestal portion 41 abuts on the bent portion 21 of each side plate 20. Thereby, as for the band 40, the pressing part 42 presses the side plate 20 to the lamination direction (Y-axis direction) with the elastic restoring force. The assembly 10 is held in a state in which the tubes 11 and the fins 15 are stacked without a gap by the pair of plate portions 23 being sandwiched between the pressing portions 42 of the band 40.

  In this state, a gap (space) corresponding to the thickness of the bent portion 21 is provided between the tube 11 and the fin 15 and the base portion 41 of the band 40.

  In the joining process, as shown in FIG. 1, the assembly 10 is a jig installed in a heating furnace via each band 40 so that the bent portion 21 of the side plate 20 comes below the tubes 11 and the fins 15. It is placed on a tool (not shown).

  The jig on which the assembly 10 is placed may include a holding portion that holds the assembly 10 in contact with a portion different from the portion in which the band 40 contacts.

  Further, a plurality of wire ropes or the like may be used as a binding tool for binding the assembly 10.

  The assembly 10 is subjected to a heat treatment in a heating furnace, whereby brazing is performed to join each member through a brazing material in which each member melts. At the time of brazing, the heat in the heating furnace is transmitted to the assembly 10 through a gap (space) provided between the band 40 and the pedestal portion 41, so that the assembly 10 is brazed uniformly.

  At the time of brazing, the fins 15 arranged on the outermost side in the stacking direction (Y-axis direction) of the assembly 10 are supported by the bent portion 21 of the band 40. Thereby, the thermal sag which the fin 15 hangs down and protrudes from the tube 11 can be prevented.

  At the time of brazing, each fin 15 disposed on the inner side in the stacking direction (Y-axis direction) of the assembly 10 is supported by being sandwiched between adjacent tubes 11. As a result, it is possible to prevent thermal sagging in which each fin 15 hangs down and protrudes from the tube 11.

  At the time of brazing, the assembly 10 is joined (adhered) to the band 40 via the brazing material by interposing the bent portion 21 of the side plate 20 between the tube 11 and the fin 15 and the base portion 41 of the band 40. Is prevented. And the assembly 10 is prevented from being joined (fixed) to the jig via the brazing material by being placed on the jig via the base portion 41 of the band 40.

  Thus, after the brazed assembly 10 is carried out of the heating furnace, the band 40 is removed. At this time, since the band 40 is not joined (fixed) to the tube 11 and the fin 15, the band 40 is smoothly pulled away from the assembly 10. This prevents the tube 11 and the fin 15 from being damaged when the band 40 is removed from the assembly 10. The assembly 10 manufactured in this way can be prevented from becoming a defective product, and the yield can be improved.

  As described above, the heat exchanger in which the fluids flowing inside and outside the tube 11 according to the present embodiment exchange heat via the fins 15, and includes the assembly 10 in which the plurality of tubes 11 and the fins 15 are stacked, A side plate 20 provided on the outermost layer of the three-dimensional body 10, and a plate-like plate portion 23 sandwiching the fins 15 between the side plate 20, the tubes 11, and the fins 15. And the heat exchanger which has the bending part 21 which protrudes in the lamination direction (Y-axis direction) from the plate part 23 and opposes the opening end 16 of the fin 15 can be provided.

  Further, a side plate 20 is provided on the outermost layer of the assembly 10 in which a plurality of tubes 11 and fins 15 according to the present embodiment are stacked, and the side plate 20 is a plate-like plate that sandwiches the fins 15 between the side plates 20. And a bent portion 21 that protrudes from the plate portion 23 in the stacking direction (Y-axis direction) and faces the open end 16 of the fin 15, and the bent portion 21 is disposed below the open end 16 of the fin 15. And the manufacturing method of the heat exchanger which joins the side plate 20, the tube 11, and the fin 15 can be provided.

  Based on the above configuration, the fin 15 and the tube 11 can be brazed without contacting the band 40 via the plate portion 23 and the bent portion 21 of the side plate 20. This prevents the band 40 from being bonded (fixed) to the fin 15 or the tube 11. For this reason, when the band 40 is removed from the brazed tube 11, the fins 15, and the side plates 20, the tube 11 or the fins 15 are prevented from being damaged. According to this, the thickness of the tube 11 or the fin 15 can be reduced, and the efficiency of heat exchange performed between the fluids flowing in and out of the tube 11 can be increased.

  Further, the bent portion 21 according to the present embodiment is in contact with the width direction end portion 14 of the tube 11.

  Based on the above configuration, the side plate 20 is assembled at a predetermined position with respect to the tube 11. In this manner, the positional deviation of the side plate 20 is suppressed, so that the assembly accuracy of the assembly 10 is ensured.

  Further, the bent portion 21 according to the present embodiment is in contact with the opening end 16 of the fin 15.

  Based on the above-described configuration, the fin 15 that is disposed most outward in the stacking direction (Y-axis direction) hangs downward when brazed, because the opening end 16 is supported by contact with the bent portion 21 of the band 40. Thermal sagging is prevented.

  Further, according to the present embodiment, the bent portion 21 is a protruding portion formed on the plate portion 23.

  Based on the above configuration, in the heat exchanger, it is possible to suppress the flow passage area around the fin 15 from being reduced by the bent portion 21 (protruding portion) protruding from the plate portion 23. Thereby, as for a heat exchanger, the fall of heat exchange efficiency is suppressed.

  As described above, the bent portion 21 is not limited to the one protruding from the width direction end 27 in a claw shape, and may be one protruding from the entire width direction end 27 of the plate portion 23 in a band shape. In this case, the protrusion amount T at which the bent portion 21 protrudes in the stacking direction (Y-axis direction) is set smaller than the dimension of the fins 15 in the stacking direction (Y-axis direction). Thereby, the assembly 10 can prevent the bent portion 21 from partially facing the opening end portion 12 of the fin 15 and greatly block the flow path formed around the fin 15.

  Moreover, according to this embodiment, the bending part 21 (projection part) is provided with two or more along with each other.

  Based on the above configuration, in the assembly 10, the displacement of the opening end 16 of the fin 15 is restricted by the plurality of bent portions 21 when brazed. Thereby, the heat | fever sagging of the fin 15 can be prevented in the wide range about a flow path direction (X-axis direction).

  Further, according to the present embodiment, the assembly 10 includes the tank plate 30 to which the open end portions 12 of the plurality of tubes 11 are connected side by side, and the plate portion 23 faces the tank plate 30 with an interval. The flow direction end 28 is provided, and the bent portion 21 is formed close to the flow direction end 28 of the plate portion 23.

  When the assembly 10 is joined, the side plate 20 has a flow direction end 28 that is a free end not connected to the tank plate 30. Becomes weaker. In response to this, since the side plate 20 faces the fins 15 at the portion where the bent portion 21 is close to the tank plate 30, it is possible to effectively prevent thermal sagging of the fins 15.

  Further, according to the present embodiment, the assembly 10 is set so that the interval between the adjacent bent portions 21 becomes smaller toward the outside away from the center plane O in the flow path direction (X-axis direction) of the plate portion 23. Is done.

  Thereby, since the side plate 20 is narrowed at the portion where the bent portion 21 is close to the tank plate 30, it is possible to effectively prevent thermal sagging of the fins 15.

  In addition, not only the structure mentioned above but the space | interval of the bending parts 21 adjacent to the plate part 23 about the flow path direction may be set uniformly.

  The side plate 20 is not limited to the configuration in which the flow direction end 28 is a free end, and the flow direction end 28 may be connected to the tank plate 30.

  Further, according to the present embodiment, the assembly 10 is arranged so that the bent portion 21 comes below the opening end 16 of the fin 15 at the time of joining.

  Based on the above configuration, when the assembly 10 is assembled, the fin 15 disposed on the outermost side in the stacking direction (Y-axis direction) has its opening end 16 facing the bent portion 21 of the side plate 20, The positional deviation with respect to the side plate 20 is regulated. Thereby, when the assembly 10 is brazed, the fin 15 hangs down and the thermal sagging that protrudes from the side plate 20 and the tube 11 can be prevented.

  The present invention can be applied to, for example, a condenser for an air conditioner, a charge air cooler of an internal combustion engine, or a radiator as a heat exchanger used in a vehicle. Moreover, this invention is applicable also to the heat exchanger used other than a vehicle.

DESCRIPTION OF SYMBOLS 10 Assembly 11 Tube 12 Open end part 15 Fin 16 Open end 20 Side plate 21 Bending part 23 Plate part 27 Width direction end 28 Channel direction end 30 Tank plate 40 Band (binding tool)

Claims (9)

A heat exchanger in which fluids flowing inside and outside the tube exchange heat via fins,
An assembly in which a plurality of the tubes and the fins are stacked;
A side plate provided on the outermost layer of the assembly; and
Joining the side plate, the tube, and the fin,
The side plate is
A plate-like plate portion sandwiching the fin between the tube, and
And a bent portion that protrudes from the plate portion in the stacking direction and faces the opening end of the fin. The heat exchanger according to claim 1,
The heat exchanger according to claim 1, wherein the bent portion is in contact with the tube. The heat exchanger according to claim 1 or 2,
The heat exchanger according to claim 1, wherein the bent portion is in contact with an open end of the fin. The heat exchanger according to any one of claims 1 to 3,
The heat exchanger according to claim 1, wherein the bent portion is a protruding portion formed on the plate portion. The heat exchanger according to claim 4,
The heat exchanger according to claim 1, wherein a plurality of the bent portions are provided. The heat exchanger according to claim 4 or 5,
The assembly includes a tank plate to which open ends of the plurality of tubes are connected,
The plate portion has a flow path direction end facing the tank plate with an interval,
The heat exchanger according to claim 1, wherein the bent portion is formed close to an end in the flow path direction. A method of manufacturing a heat exchanger in which fluids flowing inside and outside of a tube exchange heat via fins,
A side plate is provided on the outermost layer of the assembly in which the tubes and the fins are stacked,
In the side plate,
A plate-like plate portion sandwiching the fin between the tube, and
A bent portion that protrudes from the plate portion in the stacking direction and faces the opening end of the fin; and
A method of manufacturing a heat exchanger, wherein the side plate, the tube, and the fin are joined. It is a manufacturing method of the heat exchanger according to claim 7,
A method of manufacturing a heat exchanger, wherein the side plate, the tube, and the fin are bound together using a binding tool that abuts against the plate portion and the bent portion at the time of joining. It is a manufacturing method of the heat exchanger according to claim 7 or 8,
A method of manufacturing a heat exchanger, wherein the assembly is arranged so that the bent portion is located below the opening end of the fin during joining.

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