JP2015180852A - Corrugated fin and heat exchanger including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated fin and a heat exchanger including the same, capable of surely preventing bending of an unexpected part in manufacturing, thereby improving product accuracy and easiness in manufacturing.SOLUTION: In a corrugated fin 5 for a heat exchanger, formed by alternately bending flat plate portions 5a and joining portions 5b into the corrugated shape, surfaces of the flat plate portions 5a include grooved recessed portions 13 or stripe-like projecting portions 14 extended obliquely to a pair of sides 11, 11', and have at least one recessed portion 16 or projecting portion 18 on an arbitrary cut face in at least one of a direction of the pair of sides 11, 11' and a direction of a pair of end sides 12, 12'.

Description

  The present invention relates to a corrugated fin that radiates heat from a heat exchange medium and a heat exchanger including the corrugated fin in a heat exchanger such as a radiator, an oil cooler, and an aftercooler.

  For example, an engine, a radiator, a cooling fan device, and the like are installed in a predetermined arrangement in an engine room of a work vehicle such as a hydraulic excavator or a bulldozer. Then, the cooling fan device is driven to generate a flow of cooling air that passes through the radiator, thereby cooling the engine cooling water circulated between the engine and the radiator.

The radiator mainly includes an upper tank, a lower tank, a plurality of tubes, and fins.
The upper tank and the lower tank are connected by a plurality of tubes arranged at a predetermined interval. Thereby, the engine cooling water sent out from the engine is temporarily stored in the upper tank, is stored in the lower tank through a plurality of tubes, and is then returned to the engine.
The fins are arranged between adjacent tubes and are joined to the tubes by joining means such as brazing.

  As the fins, flat plate portions each having a pair of side edges facing each other and a pair of end sides facing each other, and joint portions connected to the side edges of the flat plate portions are alternately bent and formed in a corrugated shape. There are corrugated fins (see, for example, Patent Documents 1 to 3).

JP 2007-232246 A JP 2002-228379 A JP-A-9-155487

A corrugated fin is manufactured through a groove forming process and a corrugated forming process, for example.
The groove forming step is a step of forming a plurality of grooves on the plate surface by passing a strip-shaped thin plate drawn out from a thin plate coil between a pair of grooves for forming a groove, or by pressing using a press machine. .
The corrugating process is a process in which the strip-shaped thin plate after the groove forming process is passed between a pair of corrug forming rolls so that the flat plate portion and the joining portion are alternately bent in a corrugated shape. It is.

  By the way, as a groove | channel attached | subjected to a strip | belt-shaped thin plate by said groove | channel formation process, there exists a groove | channel extended in the direction where a pair of side edge of a flat plate part is arranged, for example. As another example, there is a groove extending in a direction in which the pair of end sides of the flat plate portion is arranged.

  By providing the flat plate portion with grooves extending in the direction in which the pair of side sides are arranged, the section modulus of the cut surface along the direction in which the pair of end sides is arranged can be increased. Thereby, the rigidity of a flat plate part can be improved with respect to the bending effect | action which brings a pair of side edge close. However, in this case, since the section modulus of the cut surface along the direction in which the pair of side sides is arranged cannot be increased, the rigidity of the flat plate portion is increased with respect to a bending action that brings the pair of end sides closer to each other. I can't.

  By providing the flat plate portion with grooves extending in the direction in which the pair of end sides are arranged, the section modulus of the cut surface along the direction in which the pair of side sides is arranged can be increased. Thereby, the rigidity of a flat plate part can be improved with respect to the bending action which makes a pair of edge | sides approach. However, in this case, since the section modulus of the cut surface along the direction in which the pair of end sides is arranged cannot be increased, the rigidity of the flat plate portion is increased with respect to a bending action that brings the pair of side sides closer to each other. I can't.

Therefore, the conventional corrugated fin has a problem that an unexpected part may be bent at the time of manufacture, more specifically, in the corrugating process, and the error of the shape dimension becomes large.
For this reason, when assembling a radiator core by alternately laminating corrugated fins and tubes, errors in the shape dimensions of the corrugated fins may cause warpage of the radiator core, making it difficult to improve product accuracy. There is a problem. Also, if you try to correct the corrugated fin shape error, it will take extra time and effort, and if you try to assemble the corrugated fin shape error so as to offset each other, advanced skills are required. There is a problem that production becomes difficult.

  The present invention has been made in view of the above-described problems, and can reliably prevent the occurrence of bending at an unexpected location during production, thereby improving product accuracy and facilitating production. It is an object of the present invention to provide a corrugated fin and a heat exchanger including the corrugated fin.

In order to achieve the above object, the corrugated fin according to the first aspect of the present invention comprises:
For heat exchangers in which flat plate portions each having a pair of opposite sides and a pair of opposite sides and joint portions provided continuously on the sides of the flat plate portions are alternately bent in a corrugated shape. In the corrugated fin,
The flat plate portion includes a groove-like concave portion or a line-like convex portion extending obliquely with respect to the pair of side sides on the surface, and the direction in which the pair of side sides are arranged and the pair of end sides are arranged. It is characterized by having at least one concave portion or convex portion at an arbitrary cut surface in at least one direction.

  In the first invention, it is preferable that the groove-like recesses or the streak-like projections are provided at a predetermined pitch interval (second invention).

Next, the heat exchanger according to the third invention is:
The corrugated fin according to any one of the first invention and the second invention is provided.

In the corrugated fin of the present invention, at least one concave portion or convex portion is provided on the flat plate portion at an arbitrary cut surface in at least one direction in which the pair of side sides are arranged and the direction in which the pair of end sides are arranged. It is done. Thereby, the section modulus of the cut surface along at least one direction of the direction in which the pair of side sides are arranged and the direction in which the pair of end sides are arranged can be increased, and the rigidity of the flat plate portion can be increased.
Moreover, the recessed part or convex part which is provided in a flat plate part is not provided in a junction part. Accordingly, a large difference in rigidity can be provided between the flat plate portion and the joint portion, and it can be easily and reliably bent at the boundary portion between the flat plate portion and the joint portion.
According to the corrugated fin of the present invention, it is possible to reliably prevent an unexpected portion from being bent at the time of manufacturing the corrugated fin, and to suppress an error in the shape dimension of the corrugated fin.

  Moreover, according to the heat exchanger provided with the corrugated fin of this invention, there exists an effect that a product precision is improved and the manufacture becomes easy.

It is a whole perspective view of a radiator provided with a corrugated fin concerning a 1st embodiment of the present invention. It is the X section expansion perspective view of FIG. (A) is a structural explanatory view of the flat plate portion viewed from the direction of the arrow Y in FIG. 2, (b) is a cross-sectional view taken along line AA in (a), and (c) is a cross-sectional view taken along line BB in (a). (D) is a B'-B 'line sectional view of (a). FIG. 3 is an enlarged view of a main part viewed from the arrow Z in FIG. 2. (A) is explanatory drawing of the manufacturing method of a corrugated fin, (b) State figure before corrugating, (c) State figure after corrugating, (d) is an illustration figure in case a flat surface is a plane shape, (e) FIG. 4 is an exemplary diagram when the flat surface has a curved surface shape. (A) is structure explanatory drawing of the flat plate part of the corrugated fin which concerns on 2nd Embodiment, (b) is the GG sectional view taken on the line of (a), (c) is the HH sectional view taken on the line of (a). It is. (A) is structure explanatory drawing of the flat part of the corrugated fin which concerns on 3rd Embodiment, (b) is the II sectional view taken on the line of (a), (c) is the JJ sectional view taken on the line of (a). It is. (A) is structure explanatory drawing of the flat part of the corrugated fin which concerns on 4th Embodiment, (b) is KK sectional view taken on the line of (a), (c) is LL sectional view taken on the line of (a). It is.

  Next, specific embodiments of the corrugated fin and the heat exchanger including the corrugated fin according to the present invention will be described with reference to the drawings. In the following, an example in which the present invention is applied to a radiator installed in an engine room of a work vehicle such as a hydraulic excavator or a bulldozer will be described. However, heat such as an oil cooler or an aftercooler having the same basic structure as the radiator is described. Needless to say, the present invention can also be applied to an exchanger.

  FIG. 1 is an overall perspective view of a radiator including a corrugated fin according to the first embodiment of the present invention.

<Description of the schematic structure of the radiator>
A radiator 1 shown in FIG. 1 is a device that dissipates heat obtained from an engine by engine coolant (heat exchange medium) circulated between the radiator 1 and an engine (not shown).
The radiator 1 mainly includes an upper tank 2, a lower tank 3, a tube 4, and a corrugated fin 5.
The upper tank 2 and the lower tank 3 are connected by a plurality of tubes 4. Thereby, the engine cooling water sent out from the engine can be temporarily stored in the upper tank 2, stored in the lower tank 3 through the plurality of tubes 4, and then returned to the engine.
The radiator core 6 is assembled by alternately stacking the tubes 4 and the corrugated fins 5.

<Description of tube>
As shown in FIG. 2, the tube 4 is formed of a flat tube member having an engine cooling water flow passage 4a therein.
A large number of tubes 4 are arranged with a predetermined pitch Pa in the width direction RW of the radiator 1 and with a predetermined gap S in the depth direction RD of the radiator 1.

<Overview of corrugated fin>
The corrugated fins 5 are arranged between the tubes 4 adjacent to each other in the width direction (RW) of the radiator 1. The corrugated fins 5 are formed by alternately bending the flat plate portions 5a and the joining portions 5b into a corrugated shape.

<Overview of flat plate>
The flat plate portion 5a has a pair of side edges 11 and 11 'facing each other in the width direction (RW) of the radiator 1 and a pair of end edges 12 and 12' facing each other in the depth direction (RD) of the radiator 1. It is a rectangular plate part.

<Description of groove-shaped recess in flat plate portion>
FIG. 3 shows an example in which a plurality of groove-like recesses 13 are provided on the surface of the flat plate portion 5a. As shown in FIG. 3A, on the surface of the flat plate portion 5a, a plurality of groove-like recesses 13 are equally spaced at a predetermined pitch Pb in the direction (FD) in which the pair of end sides 12, 12 ′ are arranged. Is provided.
The groove-like recess 13 is linearly inclined in the direction from the one side 11 to the other side 11 ′ as it proceeds in the direction from the one end 12 to the other end 12 ′. It is an extending recess.
In the groove-like recesses 13 adjacent to each other, when viewed in the direction (FW) in which the pair of side edges 11, 11 ′ are arranged, the groove-like recesses 13 are arranged so that a part of the groove-like recesses 13 adjacent to each other overlap. The arrangement pitch Pb, the inclination angle, the length and width of the groove-like recess 13 are determined.
In addition, by providing the several groove-shaped recessed part 13 in the surface of the flat plate part 5a, the site | part between the groove-shaped recessed parts 13 adjacent to each other becomes the stripe-shaped convex part 14 relatively. Further, by providing a groove-shaped recess 13 on the surface of the flat plate portion 5a on the back surface of the flat plate portion 5a, a streak-shaped convex portion 15 corresponding to the groove-shaped recess 13 is obtained (see FIGS. 3B and 3C). ) Will be formed.

<Explanation of uneven portion of arbitrary cut surface of flat plate portion>
As shown in FIG. 3B, the flat plate portion 5a has a plurality of recesses 16 formed by a plurality of groove-like recesses 13 at an arbitrary cut surface in the direction (FD) in which the pair of end sides 12, 12 ′ are arranged. Will have. In other words, the flat plate portion 5a has a plurality of convex portions 17 and 18 formed by a plurality of line-like convex portions 14 and 15 at an arbitrary cut surface in the direction (FD) in which the pair of end sides 12 and 12 'are arranged. It will be.
Moreover, as shown in FIGS. 3C and 3D, the flat plate portion 5a is a recess formed by the groove-like recess 13 in an arbitrary cut surface in the direction (FW) in which the pair of side edges 11 and 11 ′ are arranged. 16 will be included. In other words, the flat plate part 5a has the convex parts 17 and 18 by the streak-like convex parts 14 and 15 in an arbitrary cut surface in the direction (FW) in which the pair of side edges 11 and 11 'are arranged. In addition, as shown in FIG. 3C, in the cross section taken along the line B-B of the flat plate portion 5a, there is one concave portion 16 due to the groove-shaped concave portion 13 or one convex portion 18 due to the streaky convex portion 15. As shown in FIG. 4D, in the cross section taken along line B′-B ′, there are two concave portions 16 due to the groove-shaped concave portions 13 or two convex portions 18 due to the line-shaped convex portions 15.

<Overview of the joint>
As shown in FIG. 4, the joint portion 5 b is a rectangular plate portion that is perpendicular to the flat plate portion 5 a and is thinner than the flat plate portion 5 a, and has a flat surface 20 that is joined to the tube 4. . The flat surface 20 has a planar shape parallel to the surface 21 of the tube 4.
Here, the flat surface 20 is inevitably compared with the concept of a completely flat surface having no undulations and the groove-shaped recess 13 at the time of groove forming for attaching the groove-shaped recess 13 to the flat plate portion 5a. It includes both the concept of a substantially flat surface with a negligible extremely shallow groove (unprocessed residue).

<Description of bonding between corrugated fin and tube>
The corrugated fin 5 and the tube 4 are joined by brazing using a brazing material 22 interposed between the flat surface 20 of the joint portion 5 b and the surface 21 of the tube 4.
Since the flat surface 20 of the joint portion 5b has a planar shape, the joint area and the thermal contact area with the tube 4 can be made larger than when the flat surface 20 has a curved surface shape or a square surface shape.
Since the joining area of the flat surface 20 of the joining part 5b and the surface 21 of the tube 4 can be taken large, the corrugated fin 5 and the tube 4 can be joined more firmly.
Since the thermal contact area between the flat surface 20 of the joint 5b and the surface 21 of the tube 4 can be increased, the heat of the engine coolant flowing in the tube 4 can be efficiently conducted from the tube 4 to the corrugated fins 5. Thus, the heat dissipation effect by the corrugated fins 5 can be further enhanced.

<Description of manufacturing method of corrugated fin>
Next, a method for manufacturing the corrugated fin 5 will be described below with reference to FIG.
The manufacturing method of the corrugated fin 5 includes a groove forming step and a corrugated forming step.

<Description of groove forming process>
The groove forming step is a step of forming a plurality of groove-like recesses 13 on a plate surface of the corrugated fin material fed from the thin plate coil 30 through the strip-like thin plate 30a between the pair of first rolls 31, 31 ′.
On each outer peripheral surface of the pair of first rolls 31 and 31 ′, a plurality of uneven portions (not shown) corresponding to the plurality of groove-like recesses 13 to be attached to the strip-like thin plate 30 a are formed. When the pair of first rolls 31, 31 ′ are rotationally driven in the direction of the arrow in the figure, the strip-shaped thin plate 30 a is sandwiched between the pair of first rolls 31, 31 ′ and sent out downstream. At this time, a plurality of grooves are formed on the plate surface of the strip-shaped thin plate 30a by sandwiching the strip-shaped thin plate 30a between the concave portion of the first roll 31 on one side and the convex portion of the first roll 31 'on the other side. A concave portion 13 is provided.
In addition, the same some groove-shaped recessed part 13 can also be attached | subjected to the plate | board surface of the strip | belt-shaped thin plate 30a by the press work using a press machine.

<Description of corrugated molding process>
In the corrugate forming step, a pair of second rolls 32 and 32 are disposed on the downstream side of the first rolls 31 and 31 ′ with the strip-shaped thin plate 30 a fed out between the pair of first rolls 31 and 31 ′. In this step, the flat plate portions 5a and the joint portions 5b are alternately bent and formed in a corrugated shape.
A plurality of teeth (not shown) for bending and forming the strip-shaped thin plate 30a having a plurality of groove-like recesses 13 on the plate surface into a corrugated shape on the outer peripheral portions of the pair of second rolls 32 and 32 ' Are formed so as to be able to mesh with each other. When the pair of second rolls 32 and 32 'are rotationally driven in the direction of the arrow in the figure, the belt-like thin plate 30a is sandwiched between the pair of second rolls 32 and 32' and sent out downstream. At this time, the belt-like thin plate 30a is corrugated by sandwiching the belt-like thin plate 30a between the teeth of the second roll 32 on one side and the teeth on the second roll 32 'on the other side. It is designed to be bent.
As shown in FIG. 5B, a plurality of groove-like recesses 13 and a plurality of groove-like recesses 13 are formed on the strip-shaped thin plate 30a before being subjected to corrugation molding. There is a portion (a portion indicated by a symbol T arrow in the figure) without any uneven portion of the streaky convex portion 14. Then, corrugation is performed so that this portion becomes the joint portion 5b having the flat surface 20 (see FIG. 5C).
Here, in the present embodiment, the shape of the flat surface 20 is a planar shape as shown in FIG. 5D, but is not limited to this, and FIG. As shown, a curved shape is also included. By forming the flat surface 20 into a curved shape, stress concentration at the bent portion can be avoided.
Thus, the corrugated fins 5 obtained through the corrugating process are sandwiched between the tubes 4 adjacent to each other and joined to the tubes 4 by brazing.

<Description of Effects of First Embodiment>
In the corrugated fin 5 of the first embodiment, as shown in FIGS. 3B and 3C, the direction (FW) in which the pair of side edges 11, 11 ′ are arranged and the pair of end edges 12, 12. In two directions, i.e., the direction in which ′ is arranged (FD), the flat plate portion 5a is provided with the concave portions 16 formed by the groove-shaped concave portions 13 or the convex portions 17 and 18 formed by the line-shaped convex portions 14 and 15 at an arbitrary cut surface. Thereby, the section modulus of the cut surface along the direction (FD) in which the pair of end sides 12 and 12 'are arranged can be increased, and the direction in which the pair of side sides 11 and 11' are arranged (FW). The section modulus of the cut surface along the line can be increased. For this reason, the rigidity of the flat plate portion 5a can be enhanced with respect to both the bending action that brings the pair of side edges 11 and 11 'closer and the bending action that brings the pair of end edges 12 and 12' closer.
Further, the concave portion 16 by the groove-shaped concave portion 13 or the convex portions 17, 18 by the streak convex portions 14, 15 as provided in the flat plate portion 5a is not provided in the joint portion 5b. Thereby, a large difference in rigidity can be provided between the flat plate portion 5a and the joint portion 5b, and the boundary portion between the flat plate portion 5a and the joint portion 5b can be easily and reliably bent.
Therefore, it is possible to reliably prevent an unexpected portion from being bent at the time of manufacturing the corrugated fin 5, more specifically at the time of the corrugating process, and to suppress an error in the shape dimension of the corrugated fin 5. it can.
In the radiator 1 including the corrugated fins 5, the radiator core 6 is assembled by alternately stacking the tubes 4 and the corrugated fins 5. Since the error in the shape and dimension of the corrugated fins 5 is kept small, the radiator core 6 is not warped, and the product accuracy can be increased. In addition, since the correction work of the shape dimension error of the corrugated fin 5 and the advanced skill for offsetting the errors are not required, the manufacture thereof is also facilitated.

[Second Embodiment to Fourth Embodiment]
Next, the corrugated fins 5C, 5D, and 5E according to the second to fourth embodiments of the present invention will be sequentially described. In the following embodiments, the same or similar parts as those in the first embodiment are designated by the same reference numerals in the drawings, and detailed description thereof is omitted. In the following, the first embodiment is referred to as the first embodiment. The explanation will focus on the differences.

<Second Embodiment (see FIG. 6A): Explanation of groove-shaped recess in flat plate portion>
As shown in FIG. 6A, in the corrugated fin 5C of the second embodiment, the surface of the flat plate portion 5a has a predetermined pitch in the direction (FD) in which the pair of end sides 12, 12 ′ are arranged. A plurality of groove-like recesses 52 are provided at equal intervals in Ph.
The groove-like recess 52 is constituted by a first groove-like recess 52a, a second groove-like recess 52b, a third groove-like recess 52c, and a fourth groove-like recess 52d, and an end 12 ′ on the other side of the flat plate portion 5a. When viewed from above, the first groove-like recess 52a, the second groove-like recess 52b, the third groove-like recess 52c, and the fourth groove-like recess 52d are recesses that are continuous in a W-shape. .
The first groove-shaped recess 52a is formed on the one side with the intermediate portion between the central portion in the direction (FW) in which the pair of side edges 11, 11 'of the flat plate portion 5a are arranged and the side edge 11' on the other side as a base point. The concave portion extends linearly and obliquely in the direction from the side 11 on one side toward the side 11 'on the other side as it proceeds in the direction from the side 12 to the side 12' on the other side.
The second groove-shaped recess 52b is formed on one side with the intermediate portion between the central portion in the direction (FW) in which the pair of side edges 11, 11 'of the flat plate portion 5a are arranged and the other side edge 11' as a base point. The concave portion extends linearly and obliquely in the direction from the other side 11 ′ to the one side 11 as it proceeds in the direction from the side 12 to the other side 12 ′.
The third groove-like recess 52c is an end on one side, with an intermediate portion between the central portion in the direction (FW) in which the pair of side edges 11, 11 'of the flat plate portion 5a are arranged and the side edge 11 on one side as a base point. The concave portion extends linearly obliquely in the direction from the side 11 on one side toward the side 11 'on the other side as it proceeds in the direction from the side 12 toward the other side 12'.
The fourth groove-like recess 52d has an end on one side, with an intermediate portion between the central portion in the direction (FW) in which the pair of side edges 11 and 11 'of the flat plate portion 5a are disposed and the side edge 11 on one side as a base point. The concave portion extends linearly obliquely in the direction from the side 11 ′ on the other side toward the side 11 on the one side as it proceeds in the direction from the side 12 toward the other side 12 ′.

<Second embodiment (see FIGS. 6B and 6C): Description of uneven portions of an arbitrary cut surface of a flat plate portion>
As shown in FIG. 6B, the flat plate portion 5a has a plurality of recesses 53 formed by a plurality of groove-like recesses 52 at an arbitrary cut surface in the direction (FD) in which the pair of end sides 12 and 12 'are arranged. Will have. In other words, the flat plate portion 5a has a plurality of convex portions 56 and 57 formed by a plurality of streak-like convex portions 54 and 55 on an arbitrary cut surface in the direction (FD) in which the pair of end sides 12 and 12 'are arranged. It will be.
Further, as shown in FIG. 6C, the flat plate portion 5a has two concave portions 53 formed by the groove-shaped concave portions 52 on an arbitrary cut surface in the direction (FW) in which the pair of side edges 11 and 11 ′ are arranged. You will have more than one. In other words, the flat plate portion 5a has two or more convex portions 56, 57 formed by the streak-like convex portions 54, 55 on an arbitrary cut surface in the direction (FW) in which the pair of side edges 11, 11 ′ are arranged. become.

<Third Embodiment (see FIG. 7A): Explanation of groove-like recesses in flat plate portion>
As shown in FIG. 7 (a), in the corrugated fin 5D of the third embodiment, a predetermined pitch in the direction (FW) in which the pair of side edges 11, 11 'are arranged on the surface of the flat plate portion 5a. A plurality of groove-like recesses 58 are provided at equal intervals in Pi.
The groove-like recess 58 is constituted by a first groove-like recess 58a, a second groove-like recess 58b, a third groove-like recess 58c, and a fourth groove-like recess 58d, and the side 11 'on the other side of the flat plate portion 5a is formed. When viewed from above, the first groove-like recess 58a, the second groove-like recess 58b, the third groove-like recess 58c, and the fourth groove-like recess 58d are recesses having a shape that continues in an M shape. .
The first groove-like recess 58a is an end on the other side with the intermediate portion between the central portion in the direction (FD) in which the pair of end sides 12, 12 'of the flat plate portion 5a are arranged and the one end side 12 as a base point. The concave portion extends linearly obliquely in the direction from the side 11 'on the other side toward the side 11 on the one side as it proceeds in the direction from the side 12' to the one side 12 on the one side.
The second groove-shaped recess 58b has one end on the basis of an intermediate portion between the center portion in the direction (FD) in which the pair of end sides 12 and 12 'of the flat plate portion 5a are arranged and the one end side 12. The concave portion extends linearly obliquely in the direction from the side 11 ′ on the other side toward the side 11 on the one side as it proceeds in the direction from the side 12 toward the other side 12 ′.
The third groove-like recess 58c is based on an intermediate portion between the center portion in the direction (FD) in which the pair of end sides 12, 12 'of the flat plate portion 5a are arranged and the other end side 12', and The concave portion extends linearly obliquely in the direction from the other side 11 ′ to the one side 11 as it proceeds in the direction from the end 12 ′ to the one side 12.
The fourth groove-like concave portion 58d is formed on the one side with the intermediate portion between the center portion in the direction (FD) in which the pair of side edges 12, 12 'of the flat plate portion 5a are arranged and the other side edge 12' as a base point. The concave portion extends linearly and obliquely in the direction from the other side 11 ′ to the one side 11 as it proceeds in the direction from the side 12 to the other side 12 ′.

<Third embodiment (see FIGS. 7B and 7C): Description of irregularities on an arbitrary cut surface of a flat plate portion>
As shown in FIG. 7B, the flat plate portion 5a has two or more concave portions 59 formed by the groove-shaped concave portions 58 on an arbitrary cut surface in the direction (FD) in which the pair of end sides 12 and 12 'are arranged. Will have. In other words, the flat plate portion 5a has two or more convex portions 62 and 63 formed by the streak-shaped convex portions 60 and 61 on an arbitrary cut surface in the direction (FD) in which the pair of end sides 12 and 12 'are arranged. become.
Further, as shown in FIG. 7C, the flat plate portion 5a has a plurality of groove-like recesses 58 on a given cut surface in the direction (FW) in which the pair of side edges 11, 11 ′ are arranged. A recess 59 is provided. In other words, the flat plate portion 5a has a plurality of convex portions 62 and 63 formed by a plurality of streak-like convex portions 60 and 61 on an arbitrary cut surface in the direction (FW) in which the pair of side edges 11 and 11 ′ are arranged. It will be.

<Fourth Embodiment (see FIG. 8A): Explanation of groove-shaped recess in flat plate portion>
As shown in FIG. 8 (a), in the corrugated fin 5E of the fourth embodiment, a predetermined pitch in the direction (FD) in which the pair of end sides 12, 12 'are arranged on the surface of the flat plate portion 5a. A plurality of first groove-like recesses 64 and second groove-like recesses 65 are provided at equal intervals in Pj.
The first groove-like recess 64 is inclined in the direction from the one side 11 to the other side 11 ′ as it proceeds in the direction from the one side 12 to the other side 12 ′. It is a recessed part extended linearly.
As the second groove-shaped recess 65 advances in the direction from the one side edge 12 toward the other side edge 12 ′, the second groove-shaped recess 65 is inclined in the direction from the other side edge 11 ′ toward the one side edge 11. It is a recessed part extended linearly.
The plurality of first groove-like recesses 64 and the plurality of second groove-like recesses 65 intersect with each other and are arranged in a mesh shape as a whole.

<4th Embodiment (refer FIG.8 (b) (c)): Description of the uneven | corrugated | grooved part of the arbitrary cut surfaces of a flat plate part>
As shown in FIG. 8B, the flat plate portion 5a has a plurality of groove-shaped recesses 64, 65 on a given cut surface in the direction (FD) in which the pair of end sides 12, 12 ′ are arranged. A recess 66 is provided. In other words, the flat plate portion 5a has a plurality of convex portions 69 and 70 formed by a plurality of streak-shaped convex portions 67 and 68 at an arbitrary cut surface in the direction (FD) in which the pair of end sides 12 and 12 'are arranged. It will be.
Further, as shown in FIG. 8C, the flat plate portion 5a is formed by a plurality of groove-shaped concave portions 64, 65 at an arbitrary cut surface in the direction (FW) in which the pair of side edges 11, 11 ′ are arranged. A plurality of recesses 66 are provided. In other words, the flat plate portion 5a has a plurality of convex portions 69 and 70 formed by a plurality of streak-shaped convex portions 67 and 68 on an arbitrary cut surface in the direction (FW) in which the pair of side edges 11 and 11 'are arranged. It will be.

<Description of the effects of the second to fourth embodiments>
In any of the corrugated fins 5C, 5D, and 5E of the second to fourth embodiments, the direction (FW) in which the pair of side edges 11 and 11 ′ are arranged and the pair of end sides 12 and 12 ′ In two directions with respect to the direction (FD) arranged, the concave portions 53, 59, 66 or the streak-shaped convex portions 54, 55, 60 by two or more groove-shaped concave portions 52, 58, 64, 65 at an arbitrary cut surface. Convex portions 56, 57, 62, 63, 69, 70 by 61, 67, 68 are provided on the flat plate portion 5a. Thereby, the section modulus of the cut surface along the direction (FD) in which the pair of end sides 12 and 12 'are arranged can be increased, and the direction in which the pair of side sides 11 and 11' are arranged (FW). The section modulus of the cut surface along the line can be increased. Therefore, any of the corrugated fins 5C, 5D, 5E of the second to fourth embodiments can provide the same effects as those of the corrugated fin 5 of the first embodiment. The radiator including the corrugated fins 5C, 5D, and 5E is improved in product accuracy and easy to manufacture, similarly to the radiator 1 including the corrugated fin 5 of the first embodiment.

  As mentioned above, although the corrugated fin of this invention and the heat exchanger provided with it were demonstrated based on several embodiment, this invention is not limited to the structure described in the said embodiment, and is described in each embodiment. The configurations can be appropriately changed without departing from the gist of the configurations, for example, by appropriately combining the configurations.

  The corrugated fin of the present invention and the heat exchanger provided with the corrugated fin can surely prevent the occurrence of bending at an unexpected location during production, thereby improving product accuracy and facilitating production. Since it has a characteristic that it can be used, it can be suitably used for applications such as radiators, oil coolers, and aftercoolers.

1 Radiator (heat exchanger)
4 Tube 5, 5C, 5D, 5E Corrugated fin 5a Flat plate part 5b Joint part 11, 11 'Side edge 12, 12' End edge 13 Groove-shaped recessed part (1st Embodiment)
14, 15 Streaky convex portion (first embodiment)
16 Concave portion (first embodiment)
17, 18 Convex portion (first embodiment)
20 Flat surface 52 Groove-shaped recess (second embodiment)
53 Concave portion (second embodiment)
54,55 Straight convex portion (second embodiment)
56, 57 convex portion (second embodiment)
58 groove-shaped recess (third embodiment)
59 Concave portion (third embodiment)
60, 61 Streaky convex portion (third embodiment)
62, 63 convex portion (third embodiment)
64, 65 groove-shaped recess (fourth embodiment)
66 recess (fourth embodiment)
67, 68 Straight convex portion (fourth embodiment)
69, 70 Convex part (fourth embodiment)

Claims (3)

For heat exchangers in which flat plate portions each having a pair of opposite sides and a pair of opposite sides and joint portions provided continuously on the sides of the flat plate portions are alternately bent in a corrugated shape. In the corrugated fin,
The flat plate portion includes a groove-like concave portion or a line-like convex portion extending obliquely with respect to the pair of side sides on the surface, and the direction in which the pair of side sides are arranged and the pair of end sides are arranged. A corrugated fin having at least one concave portion or convex portion at an arbitrary cut surface in at least one of the directions.   The corrugated fin according to claim 1, wherein the groove-shaped concave portions or the line-shaped convex portions are provided at a predetermined pitch interval. A heat exchanger comprising the corrugated fin according to claim 1.

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