Corrugated fin and heat exchanger comprising a corrugated fin

Abstract

Corrugated fin (5A) for a heat exchanger (1), comprising a flat plate section (5a) and a connecting section (5b), wherein the flat plate section (5a) has a pair of lateral faces (11, 11') opposite each other in one direction (FW) and a pair of end faces (12, 12') opposite each other in one direction (FD), wherein the connecting section (5b) is connected to a lateral face of the pair of lateral faces (11, 11') of the flat plate section (5a), and wherein the flat plate sections (5a) and connecting sections (5b) are alternately formed into a corrugated shape by bending, wherein the connecting section (5b) has a flat surface (20) which is connected to a tube (4) through which a heat exchange medium circulates, and wherein the flat plate section (5a) has on a surface a plurality of groove-shaped depressions (40) or a plurality of strip-shaped projections (43) which relative to the pair of lateral sides (11,11`) extend inclinedly, wherein each of the plurality of groove-shaped depressions (40) has a first groove-shaped depression (40a) and a second groove-shaped depression (40b), wherein the first groove-shaped depression (40a) extends inclinedly in a direction from a first lateral side (11) to a second lateral side (11`) of the pair of lateral sides (11, 11') starting from the midpoint between the first lateral side (11) and the second lateral side (11`) in a direction in which the pair of lateral sides (11, 11`) is arranged, wherein the second groove-shaped depression (40b) extends inclinedly in a direction from the second lateral side (11`) to the first lateral side (11) of the pair of lateral sides (11, 11`) starting from the midpoint between the first lateral side (11) and the second lateral side (11`) in the direction in which the pair of lateral sides (11, 11`) is arranged,wherein each of the plurality of groove-shaped depressions (40) is configured such that the respective first and second groove-shaped depressions (40a, 40b) are connected to form a V-shape and the center point from which the first groove-shaped depression (40a) originates coincides with the center point from which the second groove-shaped depression (40b) originates, wherein the flat plate section (5a) has at least one depression (41) or projection (45) in any section in two directions, wherein the two directions are a direction (FW) in which the pair of lateral sides (11, 11') is arranged and a direction (FD) in which the pair of end sides (12, 12') is arranged,and wherein in the flat plate section (5a) at adjacent groove-shaped depressions (40) of the plurality of groove-shaped depressions (40) a depression (41) is formed on a straight line running on the open V-side in the direction (FW) between two endpoints of a respective groove-shaped depression (40), which is part of the groove-shaped depression (40) adjacent on the open V-side, wherein the two endpoints of the respective groove-shaped depression (40) are opposite each other in the direction (FW) and are each formed in one of the opposite lateral sides (11, 11') on the open V-side of the respective groove-shaped depression (40) and are oriented in the direction (FD) towards the end side (12') opposite on the open V-side of the respective groove-shaped depression (40).

Description

field of technology The present invention relates to a corrugated fin for dissipating heat from a heat exchange medium in a heat exchanger, such as a radiator, an oil cooler, or an aftercooler. The invention further relates to a heat exchanger with a corrugated fin. General state of the art In the engine compartment of a work vehicle, such as a hydraulic excavator or bulldozer, an engine, a radiator, a cooling fan, and other components are arranged in a predetermined pattern. During operation, the cooling fan creates a flow of airflow that passes over the radiator, thus cooling the engine coolant circulating between the engine and the radiator. The radiator is mainly composed of an upper tank, a lower tank, and a variety of tubes and fins. The upper and lower tanks are connected by a multitude of pipes arranged at predetermined intervals. Therefore, the engine coolant coming from the engine is first stored in the upper tank, then passes through the multitude of pipes to be stored in the lower tank, and is then returned to the engine. The ribs are arranged between the adjacent tubes and connected to the tubes by means of fasteners such as soldering. As an example of the rib described above, there is a corrugated rib with flat plate sections and connecting sections that are alternately corrugated by bending. Such a rib is known from JP 2007-232246 A, JP 2002-228 379 A, ​​and JP H09-155 487 A. The flat plate sections of such a corrugated rib each have a pair of opposing lateral faces and a pair of opposing end faces, while the connecting sections are each joined to the lateral faces of the flat plate sections. The method for forming grooves is a method for forming a plurality of grooves on a surface of a strip-like sheet metal by passing the strip-like sheet metal, unwound from a sheet metal coil, between a pair of groove rollers, or by press machining using a press. In the corrugation process, the strip-like sheet metal, which has undergone the process of forming grooves, passes through a pair of corrugating rollers for bending, with the flat plate sections and the connecting sections alternately forming a corrugated shape. Examples of grooves formed in the process of forming grooves in strip-like sheet metal include grooves extending in a direction in which the pair of lateral sides of the flat plate section is arranged, and grooves extending in a direction in which the pair of end sides of the flat plate section is arranged. Providing the flat plate section with grooves extending in the direction in which the pair of lateral faces is arranged can increase the section modulus of a section along the direction in which the pair of end faces is arranged. Accordingly, the flat plate section can exhibit increased stiffness with respect to a bending action that brings the pair of lateral faces close together. However, in this case, a section along the direction in which the pair of lateral faces is arranged cannot have an increased section modulus, so the flat plate section cannot exhibit increased stiffness with respect to a bending action that brings the pair of end faces close together. Providing the flat plate section with grooves extending in the direction in which the pair of end faces is arranged can increase the section modulus of a section along the direction in which the pair of lateral faces is arranged. Accordingly, the flat plate section can exhibit increased stiffness with respect to such a bending action that brings the pair of end faces close together. However, in this case, a section along the direction in which the pair of end faces is arranged cannot exhibit an increased section modulus, so the flat plate section cannot exhibit increased stiffness with respect to such a bending action that brings the pair of lateral faces close together. Therefore, during the production of conventional corrugated ribs, or more precisely, in the corrugation process, bending may occur at an unexpected point, which can lead to problematic increases in dimensional deviations. For this reason, dimensional deviations of the corrugated fins accumulate when a radiator core is assembled by alternating stacking of the fins and tubes, which in turn can deform the radiator core, making it difficult to improve product accuracy. Correcting the dimensional deviation of the corrugated fins requires additional time and effort, while assembling them in such a way that the dimensional deviations of the corrugated fins cancel each other out demands considerable expertise. In any case, manufacturing is complicated in a problematic way. German patent application DE 10 2007 009 535 A1 discloses a heat exchanger with a corrugated fin, wherein the corrugated fin comprises connecting parts and flat parts. The connecting parts are connected to adjacent pipes that serve as coolant channels. The flat parts incorporate fins, baffles, and air slots. Air flows between the flat parts of the corrugated fin, and a portion of the air flows through the openings formed by the fins, baffles, and air slots. In this process, heat is absorbed by the air or radiated to the air and transferred to a heat or cooling medium that flows through a coolant channel in the pipe. JP 2007-232 246 A, DE 102 10 579 A1, and WO 2006 / 041 206 A1 disclose articles with corrugated ribs and strip-shaped elevations formed by punching lamellar openings and bending up punched material parts, wherein these strip-shaped elevations run straight, i.e. transversely, from one lateral side to the other lateral side or only in a short edge strip on the respective lateral side of a sheet. DE 195 03 766 A1 discloses an object with a corrugated rib in which wave-like groove-shaped depressions run along the side of a bending edge to a connecting section and thus parallel to the lateral sides of the corrugated rib. Heat exchanger fins are also known from DE 603 ​​03 197 T2 and JP S62-172 193 A. Description of the invention Problems to be solved by the invention In light of the aforementioned problems, the present invention aims to provide a corrugated fin capable of reliably preventing bending at an unexpected location during manufacturing, thereby improving product accuracy and simplifying production. The invention also aims to provide a heat exchanger incorporating this corrugated fin. It is an object of the present invention to provide a corrugated rib that is able to reliably prevent bending at an unexpected location during manufacturing. This problem is solved according to the invention by a corrugated fin according to claim 1 and a corrugated fin according to claim 2 and a heat exchanger according to claim 5. Advantageous embodiments and expedient further developments of the invention are the subject of dependent claims 3 and 4. Means of solving the problems To achieve the above-mentioned objective, a corrugated fin for a heat exchanger, according to a first aspect, can have a flat plate section and a connecting section, which are alternately corrugated by bending, wherein the flat plate section has a pair of opposing lateral sides and a pair of opposing end sides, wherein the connecting section is connected to a lateral side of the pair of lateral sides of the flat plate section, wherein the connecting section has a flat surface which is connected to a tube through which a heat exchange medium circulates, and wherein the flat plate section has at least one depression or projection in any section in two directions, and the two directions are one direction in which the pair of lateral sides is arranged and one direction in which the pair of end sides is arranged. According to a second aspect, which is based on the first aspect, it may be preferable to have the flat surface of the connecting section formed into a planar surface. According to a third aspect, which is based on the first aspect, it may be preferable to provide that the flat surface of the connecting section is shaped into a curved surface. According to a fourth aspect, based on the first, second or third aspect, it may be preferable to provide for two or more recesses or protrusions. A heat exchanger according to a fifth aspect includes a corrugated fin according to the first, second, third or fourth aspect. In the corrugated rib according to the first aspect, the flat plate section has at least one depression or at least one projection in any given section in two directions, that is, the direction in which the pair of lateral faces is arranged and the direction in which the pair of end faces is arranged. Accordingly, the section along the direction in which the pair of end faces is arranged, and the section along the direction in which the pair of lateral faces is arranged, can have increased section moduli. For this reason, the flat plate section can have increased stiffness with respect to a bending action that brings the pair of lateral faces close together, as well as with respect to a bending action that brings the pair of end faces close together. Unlike the flat plate section, the connecting section does not have a recess or projection. This allows for a significant difference in stiffness between the flat plate section and the connecting section, thus enabling simple and reliable bending at the interface between the flat plate section and the connecting section. In the case of the corrugated rib, according to the first aspect, bending at an unexpected point during the manufacturing of the corrugated rib can be reliably prevented, which allows the corrugated rib to have a reduced dimensional deviation. The design according to the second aspect can increase the area connected to the pipe and the thermal contact area, thus allowing a tighter connection between the corrugated fin and the pipe and improving the heat dissipation effect of the corrugated fin. Training according to the third aspect makes it possible to avoid a stress concentration on a bent part. The design according to the fourth aspect makes it possible to further increase the stiffness of the flat plate section and allows for simpler and more reliable bending at the interface between the flat plate section and the connecting section. The heat exchanger according to the fifth aspect exhibits increased product accuracy and is therefore easy to manufacture. Brief description of the drawings [Fig. 1] Fig. 1 is a general perspective view of a radiator according to a first exemplary embodiment. [Fig. 2] Fig. 2 is an enlarged perspective view of the area marked X in Fig. 1. [Fig. 3] Fig. 3(a) shows the structure of a flat plate section seen in the direction of arrow Y in Fig. 2, and Fig. 3(b), Fig. 3(c) and Fig. 3(d) are sectional views along the corresponding lines AA, BB, B'-B' in Fig. 3(a). [Fig. 4] Fig. 4 is an enlarged view of an essential part seen in the direction of arrow Z in Fig. 2. [Fig. 5] Fig. 5(a) shows a method for producing a corrugated fin, Fig. 5(b) is a state view before corrugation, Fig. 5(c) is a state view after corrugation, and Fig. Fig. 5(d) and Fig. 5(e) show corresponding shapes of a planar surface, where Fig. 5(d) shows a planar surface and Fig. 5(e) shows a curved surface. [Fig. 6]Figure 6 shows variations of the corrugated rib according to the first embodiment. [Fig. 7] Figure 7(a) shows the structure of a flat plate section of a corrugated rib according to an exemplary embodiment of the invention, wherein Figures 7(b), 7(c) and 7(d) are sectional views along corresponding lines CC, DD, D'-D' in Figure 7(a). [Fig. 8] Figure 8(a) shows the structure of a flat plate section of a corrugated rib according to a further exemplary embodiment, and Figures 8(b), 8(c) and 8(d) are sectional views along corresponding lines EE, FF, F'-F' in Figure 8(a). [Fig. 9] Figure 9(a) shows the structure of a flat plate section of a corrugated rib according to a fourth exemplary embodiment, and Figures 9(b) and 9(c) are sectional views along corresponding lines GG, HH in Fig. 9(a) .[ Fig. 10 ] Fig. 10(a) shows the structure of a flat plate section of a corrugated rib according to a fifth exemplary embodiment, and Fig.Fig. 10(b) and Fig. 10(c) are sectional views along corresponding lines II, JJ in Fig. 10(a). [Fig. 11] Fig. 11(a) shows the structure of a flat plate section of a corrugated rib according to a sixth exemplary embodiment, and Fig. 11(b) and Fig. 11(c) are sectional views along corresponding lines KK, LL in Fig. 11(a). [Fig. 12] Fig. 12(a) shows the structure of a flat plate section of a corrugated rib according to a seventh exemplary embodiment, and Fig. 12(b), Fig. 12(c), Fig. 12(d) and Fig. 12(e) are sectional views along corresponding lines MM, M'-M', NN, N'-N' in Fig. 12(a). [Fig. 13] Fig. 13(a) shows the structure of a flat plate section of a corrugated rib according to an eighth exemplary embodiment, and Fig. 13(b) and Fig. 13(c) are sectional views along corresponding lines QQ, RR in Fig. 13(a) . Specific exemplary embodiments of a corrugated fin and a heat exchanger with the corrugated fin according to the present invention are shown below with reference to the accompanying drawings. The following description provides an example in which the invention is used in a radiator installed in the engine compartment of a work vehicle, such as a hydraulic excavator or a bulldozer. However, it is obvious that the invention is applicable to heat exchangers that have the same basic structure as the radiator, such as an oil cooler or an aftercooler. Fig. 1 is a general perspective view of a radiator with a corrugated fin according to the first exemplary embodiment. (Description of a schematic structure of the radiator) The radiator 1 shown in Fig. 1 is a device for dissipating heat that the engine cooling water (a heat exchange medium) circulates between the radiator 1 and an engine (not shown) receives from the engine. This radiator 1 is mainly composed of an upper tank 2, a lower tank 3, pipes 4 and corrugated fins 5. The upper tank 2 and the lower tank 3 are connected to each other by the multitude of pipes 4, thus allowing the engine cooling water coming from the engine to first be stored in the upper tank 2, then to pass through the multitude of pipes 4 to be stored in the lower tank 3 and then to be returned to the engine. The tubes 4 and the corrugated fins 5 are stacked alternately on top of each other to form a radiator core 6. (Description of the pipes) As shown in Fig. 2, the tubes 4 are each formed from a flattened tube element which has an inner passage 4a for the engine coolant. The multitude of tubes 4 are arranged at a predetermined distance Pa along the width direction RW of the radiator 1 and at a predetermined distance S along the depth direction RD of the radiator 1. (Brief description of the corrugated rib) The corrugated rib 5 is arranged between the tubes 4, which lie side by side in the width direction RW of the radiator 1. The corrugated rib 5 has flat plate sections 5a and connecting sections 5b, which are alternately corrugated by bending. (Brief description of the flat plate section) Each flat plate section 5a is a rectangular plate section with a pair of lateral sides 11, 11' opposite each other in the width direction RW of the radiator 1, and a pair of end sides 12, 12' opposite each other in the depth direction RD of the radiator 1. (Description of the groove-shaped depressions of the flat plate section) As shown in Fig. 3(a), the flat plate section 5a is provided on its surface with a plurality of groove-shaped recesses 13, which are evenly spaced apart from each other at a predetermined distance Pb along the direction FD in which the pair of end faces 12, 12' is arranged. The groove-shaped recesses 13 extend linearly from the end side 12 towards the end side 12', while from the lateral side 11 they are inclined or obliquely arranged towards the lateral side 11'. The distance Pb for arranging the groove-shaped recesses 13, an angle of inclination, length and width of each groove-shaped recess 13 and other parameters are determined such that the adjacent groove-shaped recesses 13 partially overlap each other, viewed in the direction FW in which the pair of lateral sides 11, 11' is arranged. The provision of numerous groove-shaped depressions 13 on the surface of the flat plate section 5a causes a section between the adjacent groove-shaped depressions 13 to become a relatively strip-shaped projection 14. Furthermore, the provision of the groove-shaped depressions 13 on the surface of the flat plate section 5a leads to the formation of corresponding strip-shaped projections 15 (see Fig. 3(b) and Fig. 3(c)) on a rear surface of the flat plate section 5a. (Description of the depressions and protrusions of the flat plate section in any sections) As shown in Fig. 3(b), the flat plate section 5a has the plurality of recesses 16, defined by the corresponding plurality of groove-shaped recesses 13, in any section along the direction FD in which the pair of end faces 12, 12' is arranged. In other words, the flat plate section 5a has the plurality of projections 17, 18, defined by the corresponding plurality of strip-shaped projections 14, 15, in any section along the direction FD in which the end faces 12, 12' are arranged. As shown in Fig. 3(c) and Fig. 3(d), the flat plate section 5a has recesses 16, defined by corresponding groove-shaped recesses 13, in any sections along the direction FW in which the pair of lateral sides 11, 11' are arranged. In other words, the flat plate section 5a has projections 17, 18, defined by corresponding strip-shaped projections 14, 15, in any sections along the direction FW in which the lateral sides 11, 11' are arranged. It should be noted that, as shown in Fig. 3(c), a recess 16, defined by the groove-shaped recess 13, or a projection 18, defined by the strip-shaped projection 15, is provided in the section of the flat plate section 5a that runs along line BB, while, as shown in Fig.3(d) shown, two recesses 16 defined by corresponding groove-shaped recesses 13, or two projections 18 defined by corresponding strip-shaped projections 15, are provided in the section along line B'-B'. (Brief description of the connection section) As shown in Fig. 4, the connecting section 5b is a rectangular plate section which forms a right angle with the flat plate section 5a, is smaller than the flat plate section 5a and has a flat surface 20 which is connected to the tube 4. The flat surface 20 is a planar surface that is parallel to the surface 21 of the tube 4. Conceptually, this flat surface 20 has two effects, one of which is that the surface 20 is a completely flat surface without waviness, and the other is that the surface 20 is an essentially flat area which, compared to the groove-shaped depressions 13, has extremely slight, shallow grooves (grooved remnants) that inevitably form when a grooving process is carried out to form groove-shaped depressions 13 in a flat plate section 5a. (Description of the connection between the corrugated rib and the tube) The corrugated rib 5 and the tube 4 are joined together by soldering, using a filler metal 22 which is positioned between the flat surface 20 of the connecting section 5b and the surface 21 of the tube 4. Since the flat surface 20 of the connection section 5b is planar, the flat surface 20 of the connection section 5b can have a larger area connected to the tube 4 and, compared with cases where the flat surface 20 is a curved surface or an angular surface, a larger thermal contact area. Obtaining the larger contact area between the flat surface 20 of the connecting section 5b and the surface 21 of the tube 4 enables a stronger connection between the corrugated rib 5 and the tube 4. The increased thermal contact area between the flat surface 20 of the connecting section 5b and the surface 21 of the tube 4 enables efficient conduction of the heat of the engine cooling water flowing through the tube 4 from the tube 4 to the corrugated fin 5, thereby improving the heat dissipation effect of the corrugated fin 5. (Description of a process for manufacturing the corrugated rib) Next, a description of the process for manufacturing the corrugated rib 5 is provided with reference to Fig. 5(a). The manufacturing process of a corrugated rib 5 includes a process for forming grooves and a corrugating process. (Description of the process for forming grooves) The method for forming grooves is a method for forming the plurality of groove-shaped depressions 13 on a surface of a strip-like sheet 30a, a corrugated rib material, by passing a strip-like sheet 30a unwound from a sheet coil 30 between a first pair of rollers 31, 31'. The pair of first rollers 31, 31' has a plurality of depressions and projections (not shown) on their outer circumferential surfaces to correspond to the plurality of groove-shaped depressions 13 to be formed in the strip-like sheet 30a. As the first rollers 31, 31' rotate in the directions indicated by the arrows in the drawing, the strip-like sheet 30a is inserted between these rollers 31, 31' and advanced in the strip-running direction. Here, the plurality of groove-shaped depressions 13 are formed on the surface of the strip-like sheet 30a as a result of the insertion of the strip-like sheet 30a between the depressions of the first roller 31 on one side and the projections of the first roller 31' on the other side. It should be noted that similar groove-shaped depressions 13 can be formed on the surface of the strip-like sheet 30a by pressing using a press. (Description of the wave process) The corrugation process is a bending process in which the strip-like sheet 30a, exiting from the first pair of rollers 31, 31', passes through a pair of second rollers 32, 32', which are arranged behind the first rollers 31, 31' in the direction of strip travel, wherein the flat plate sections 5a and the connecting sections 5b alternately form the corrugated shape. The pair of second rollers 32, 32' has a multitude of teeth (not shown) on their outer circumferential surfaces to bend the strip-like sheet 30a, which has groove-shaped depressions 13 on its surface, into a wave shape. The teeth of roller 32 and the teeth of roller 32' are shaped such that they interlock. Since the second rollers 32, 32' rotate in the directions indicated by the arrows in the drawing, the strip-like sheet 30a is clamped between these rollers 32, 32' and conveyed in the direction of strip travel. Here, the strip-like sheet 30a is bent into a wave shape as a result of being clamped in a space between the teeth of the second roller 32 and the teeth of the second roller 32'. As shown in Fig. 5(b), the strip-like sheet 30a, which is subjected to wave forming, has sections (indicated by arrows T in the drawing) without groove-shaped depressions 13 and without strip-shaped projections 14 resulting from the groove-shaped depressions 13. The wave forming is carried out such that these sections are formed into connecting sections 5b, each with a flat surface 20 (see Fig. 5(c) ). In this embodiment, the flat surface 20 is planar, as shown in Fig. 5(d). However, the flat surface 20 is not limited to this and can also be curved, as shown in Fig. 5(e). Forming the flat surface 20 into a curved surface can avoid stress concentration on a curved part. The corrugated rib 5, which has been subjected to the corrugation process, is therefore clamped between the adjacent tubes 4 and connected to these tubes 4 by soldering. (Description of the effects of the first embodiment) In the corrugated rib 5 according to the first embodiment, the flat plate section 5a, as shown in Fig. 3(b) and Fig. 3(c), has recesses 16, defined by groove-shaped recesses 13, or projections 17, 18, defined by strip-shaped projections 14, 15, in any section along the corresponding two directions, that is, direction FW, in which the pair of lateral sides 11, 11' is arranged, and direction FD, in which the pair of end sides 12, 12' is arranged. This can increase a section modulus of the section along direction FD, in which the end sides 12, 12' are arranged, as well as a section modulus of the section along direction FW, in which the lateral sides 11, 11' are arranged.For this reason, the flat plate section 5a can have increased stiffness with respect to such a bending action which brings the lateral sides 11, 11' close together, as well as with respect to such a bending action which brings the end sides 12, 12' close together. The connecting section 5b is not provided with a recess 16 defined by the groove-shaped recess 13, or with projections 17, 18 defined by the corresponding strip-shaped projections 14, 15, as provided, for example, on the flat plate section 5a. This allows for a large difference in stiffness between the flat plate section 5a and the connecting section 5b, and thus enables simple and reliable bending at an interface between the flat plate section 5a and the connecting section 5b. Consequently, bending at an unexpected point during the manufacture of the corrugated rib 5, or more precisely, in the corrugation process, can be prevented with a high degree of certainty, thereby reducing dimensional deviations of the corrugated rib 5. The radiator core 6 of the radiator 1 according to the first embodiment is assembled by alternately stacking the tubes 4 and the corrugated fins 5. Since dimensional deviations of each individual corrugated fin 5 can be reduced, the radiator core 6 does not deform, thus increasing product accuracy. Furthermore, no correction of dimensional deviations of the corrugated fin 5 and no high level of expertise is required to compensate for dimensional deviations, thereby simplifying manufacturing. (Description of variations of the first embodiment) Figs. 6(a) to 6(f) are top views of corresponding flat plate sections 5a, which represent the variations of the corrugated rib 5 according to the first embodiment. The corrugated rib 5 according to the first embodiment has at least one recess 16 on its flat plate section 5a, which is defined by the groove-shaped recess 13, in any section along both directions, that is, direction FW, in which the pair of lateral sides 11, 11' is arranged, and direction FD, in which the pair of end sides 12, 12' is arranged. This structure can have suitable variations without deviating from the purpose of this structure. For example, the groove-shaped recess 13 can be replaced by the groove-shaped recess 13A with a larger groove width than the recess 13, as shown in Fig. 6(a). As shown in Fig. 6(b), the distance Pb at which the groove-shaped recesses 13 are arranged can be changed to a smaller distance Pc. As shown in Fig. 6(c), the groove-shaped recesses 13 can be arranged at at least two different distances Pd, Pe. As shown in Fig. 6(d), the groove-shaped recesses 13, 13A can be arranged alternately with different groove widths. As shown in Fig. 6(e), a plurality of groove-shaped depressions 13B, shorter in length than the groove-shaped depressions 13, are arranged alternately as equivalents to the depressions 13. While the groove-shaped recesses 13 extend linearly from the end face 12 of the flat plate section 5a towards the end face 12' and are inclined from the lateral side 11 towards the lateral side 11', the groove-shaped recesses 13C shown in Fig. 6(f) can be provided instead. These recesses 13C extend linearly from the end face 12 of the flat plate section 5a towards the end face 12', while they are inclined in the opposite direction, that is, from the lateral side 11' towards the lateral side 11. (Second to eighth exemplary embodiments) The following are consecutive descriptions of corrugated ribs 5A to 5G according to the corresponding second to eighth exemplary embodiments. In the following embodiments, the elements similar to those in the first embodiment have the same reference numerals in the drawings, the detailed descriptions of these elements are omitted, and the emphasis is placed on various features not seen in the first embodiment. (Description of the groove-shaped recesses of a flat plate section shown in FIG. 7(a) according to the embodiment of the invention) The embodiment of a corrugated rib 5A shown in Fig. 7(a) according to the invention has on a surface of its flat plate section 5a the plurality of groove-shaped recesses 40, which are evenly spaced at a predetermined distance Pf, along the direction FD in which a pair of end faces 12, 12' is arranged. Each groove-shaped depression 40 is formed from a first groove-shaped depression 40a and a second groove-shaped depression 40b, and since in the top view the end face 12' of the flat plate section 5a is located over the other end face 12, the first and the second groove-shaped depressions 40a, 40b are joined to form a V-shape. Starting from a midpoint in the direction FW, in which a pair of lateral sides 11, 11' of the flat plate section 5a is arranged, the first groove-shaped depression 40a extends linearly from the end side 12 towards the end side 12', while it is inclined from the lateral side 11 towards the lateral side 11'. Starting from the midpoint of the direction FW in which the lateral sides 11, 11' of the flat plate section 5a are arranged, the second groove-shaped depression 40b extends linearly from the end side 12 towards the end side 12', while it is inclined from the lateral side 11' towards the lateral side 11. (Description of the depressions and projections of the flat plate section in the arbitrary sections shown in Fig. 7(b), Fig. 7(c) and Fig. 7(d) according to the embodiment of the invention) As shown in Fig. 7(b), the flat plate section 5a has the plurality of recesses 41, defined by the corresponding plurality of groove-shaped recesses 40, in any section along the direction FD in which the pair of end faces 12, 12' is arranged. In other words, the flat plate section 5a has the plurality of projections 44, 45, defined by a corresponding plurality of strip-shaped projections 42, 43, in any section along the direction FD in which the end faces 12, 12' are arranged. As shown in Fig. 7(c) and Fig. 7(d), the flat plate section 5a has recesses 41, defined by groove-shaped recesses 40, in arbitrary sections along the direction FW in which the pair of lateral sides 11, 11' are arranged. In other words, the flat plate section 5a has projections 44, 45, defined by strip-shaped projections 42, 43, in arbitrary sections along the direction FW in which the lateral sides 11, 11' are arranged. It should be noted that, as shown in Fig. 7(c), a recess 41, defined by the groove-shaped recess 40, or a projection 45, defined by the strip-shaped projection 43, exists in the section of the flat plate section 5a along line DD, while, as shown in Fig.7(d) shown, two depressions 41 exist, defined by the groove-shaped depression 40, or two projections 45 exist, defined by the strip-shaped projection 43, in the section along the line D'-D'. (Description of the groove-shaped recesses of a flat plate section shown in FIG. 8(a) according to the third embodiment) As shown in Fig. 8(a), the corrugated rib 5B according to the third embodiment has on a surface of its flat plate section 5a the plurality of groove-shaped recesses 46, which are uniformly spaced at a predetermined distance Pg, along a direction FD in which a pair of end faces 12, 12' is arranged. The groove-shaped depressions 46 are depressions which are each curved in an arc shape and which are arched between the lateral sides 11, 11' in the direction of the end side 12. (Description of the recesses and projections of the flat plate section in the arbitrary sections shown in Fig. 8(b), Fig. 8(c) and Fig. 8(d) according to the third embodiment) As shown in Fig. 8(b), the flat plate section 5a has the plurality of recesses 47, defined by the corresponding plurality of groove-shaped recesses 46, in any section along the direction FD in which the pair of end faces 12, 12' is arranged. In other words, the flat plate section 5a has the plurality of projections 50, 51, defined by a corresponding plurality of strip-shaped projections 48, 49, in any section along the direction FD in which the end faces 12, 12' are arranged. As shown in Fig. 8(c) and Fig. 8(d), the flat plate section 5a has recesses 47, defined by groove-shaped recesses 46, in any sections along the direction FW in which the pair of lateral sides 11, 11' are arranged. In other words, the flat plate section 5a has projections 50, 51, defined by strip-shaped projections 48, 49, in any sections along the direction FW in which the lateral sides 11, 11' are arranged. It should be noted that, as shown in Fig. 8(c), a recess 47, defined by a groove-shaped recess 46, or a projection 51, defined by a strip-shaped projection 49, is provided in the section of the flat plate section 5a along line FF, while, as shown in Fig.8(d) shown, two recesses 47 defined by the groove-shaped recess 46 or two projections 51 defined by the strip-shaped projection 49 are provided in the section along the line F'-F'. (Description of the groove-shaped recesses of a flat plate section shown in FIG. 9(a) according to the fourth embodiment) As shown in Fig. 9(a), the corrugated rib 5C according to the fourth embodiment has on a surface of its flat plate section 5a the plurality of groove-shaped recesses 52, which are uniformly spaced at a predetermined distance Ph, along a direction FD in which a pair of end faces 12, 12' is arranged. Each groove-shaped depression 52 is formed from a first groove-shaped depression 52a, a second groove-shaped depression 52b, a third groove-shaped depression 52c and a fourth groove-shaped depression 52d, and since in the top view the end face 12' of the flat plate section 5a is located over the other end face 12, these first to fourth groove-shaped depressions 52a, 52b, 52c, 52d are joined to form a W-shape. Starting from a point in the middle between the lateral side 11' and a midpoint of the direction FW in which the lateral sides 11, 11' of the flat plate section 5a are arranged, the first groove-shaped depression 52a extends linearly from the end side 12 towards the end side 12', while it is inclined from the lateral side 11 towards the lateral side 11'. Starting from a point in the middle between the lateral side 11' and the midpoint of the direction FW in which the lateral sides 11, 11' of the flat plate section 5a are arranged, the second groove-shaped depression 52 extends linearly from the end side 12 towards the end side 12', while it is inclined from the lateral side 11' towards the lateral side 11. Starting from a point in the middle between the lateral side 11 and the midpoint of the direction FW in which the lateral sides 11, 11' of the flat plate section 5a are arranged, the third groove-shaped recess 52c extends linearly from the end side 12 towards the end side 12', while it is inclined from the lateral side 11 towards the lateral side 11'. Starting from the point in the middle between the lateral side 11 and the midpoint of the direction FW in which the lateral sides 11, 11' of the flat plate section 5a are arranged, the fourth groove-shaped depression 52d extends linearly from the end side 12 towards the end side 12', while it is inclined from the lateral side 11' towards the lateral side 11. (Description of the depressions and projections of the flat plate section shown in the arbitrary sections shown in Fig. 9(b) and Fig. 9(c) according to the fourth embodiment) As shown in Fig. 9(b), the flat plate section 5a has the plurality of recesses 53, defined by the corresponding plurality of groove-shaped recesses 52, in any section along the direction FD in which the pair of end faces 12, 12' is arranged. In other words, the flat plate section 5a has the plurality of projections 56, 57, defined by a corresponding plurality of strip-shaped projections 54, 55, in any section along the direction FD in which the end faces 12, 12' are arranged. As shown in Fig. 9(c), the flat plate section 5a has at least two recesses 53, defined by the groove-shaped recess 52, in any section along the direction FW in which the pair of lateral sides 11, 11' is arranged. In other words, the flat plate section 5a has at least two projections 56, 57, defined by the strip-shaped projections 54, 55, in any section along the direction FW in which the lateral sides 11, 11' are arranged. (Description of the groove-shaped recesses of a flat plate section shown in FIG. 10(a) according to the fifth embodiment) As shown in Fig. 10(a), the corrugated rib 5D according to the fifth embodiment has on a surface of its flat plate section 5a the plurality of groove-shaped recesses 58, which are uniformly spaced at a predetermined distance Pi, along a direction FW in which a pair of lateral sides 11, 11' is arranged. Each groove-shaped depression 58 is formed from a first groove-shaped depression 58a, a second groove-shaped depression 58b, a third groove-shaped depression 58c and a fourth groove-shaped depression 58d, and since in the top view the lateral side 11' of the flat plate section 5a is located over the other lateral side 11, these first to fourth groove-shaped depressions 58a, 58b, 58c, 58d are connected to form an M-shape. Starting from a point in the middle between the end face 12 and a midpoint of the direction FD in which a pair of end faces 12, 12' of the flat plate section 5a is arranged, the first groove-shaped depression 58a extends linearly from the end face 12' towards the end face 12, while it is inclined from the lateral side 11' towards the lateral side 11. Starting from the point in the middle between the end face 12 and the midpoint of the direction FD in which the end faces 12, 12' of the flat plate section 5a are arranged, the second groove-shaped depression 58b extends linearly from the end face 12 in the direction of the end face 12', while it is inclined from the lateral side 11' in the direction of the lateral side 11. Starting from a point in the middle between the end face 12' and the midpoint of the direction FD in which the end faces 12, 12' of the flat plate section 5a are arranged, the third groove-shaped depression 58c extends linearly from the end face 12' towards the end face 12, while it is inclined from the lateral side 11' towards the lateral side 11. Starting from the point in the middle between the end face 12' and the midpoint of the direction FD in which the end faces 12, 12' of the flat plate section 5a are arranged, the fourth groove-shaped depression 58d extends linearly from the end face 12 in the direction of the end face 12', while it is inclined from the lateral side 11' in the direction of the lateral side 11. (Description of the depressions and projections of the flat plate section in the arbitrary sections shown in Fig. 10(b) and Fig. 10(c) according to the fifth embodiment) As shown in Fig. 10(b), the flat plate section 5a has at least two recesses 59, defined by the groove-shaped recesses 58, in any section along the direction FD in which the pair of end faces 12, 12' is arranged. In other words, the flat plate section 5a has at least two projections 62, 63, defined by the strip-shaped projections 60, 61, in any section along the direction FD in which the end faces 12, 12' are arranged. As shown in Fig. 10(c), the flat plate section 5a has the plurality of recesses 59, defined by the corresponding plurality of groove-shaped recesses 58, in any section along the direction FW in which the pair of lateral sides 11, 11' is arranged. In other words, the flat plate section 5a has the plurality of projections 62, 63, defined by the corresponding plurality of strip-shaped projections 60, 61, in any section along the direction FW in which the lateral sides 11, 11' are arranged. (Description of the groove-shaped recesses of a flat plate section shown in FIG. 11(a) according to the sixth embodiment) As shown in Fig. 11(a), the corrugated rib 5E according to the sixth embodiment has on a surface of its flat plate section 5a the plurality of first groove-shaped recesses 64 and the plurality of second groove-shaped recesses 65, which are uniformly spaced at a predetermined distance Pj, along the direction FD in which a pair of end faces 12, 12' is arranged. Each first groove-shaped depression 64 extends linearly from the end side 12 towards the end side 12', while it is inclined from the lateral side 11 towards the lateral side 11'. Every second groove-shaped depression 65 extends linearly from the end side 12 towards the end side 12', while it is inclined from the lateral side 11' towards the lateral side 11. The first groove-shaped depression 64 crosses the second groove-shaped depression 65, thus forming a mesh-like pattern overall. (Description of the depressions and projections of the flat plate section in the arbitrary sections shown in Fig. 11(b) and Fig. 11(c) according to the sixth embodiment) As shown in Fig. 11(b), the flat plate section 5a has the plurality of recesses 66, defined by the plurality of groove-shaped recesses 64, 65, in any section along the direction FD in which the pair of end faces 12, 12' are arranged. In other words, the flat plate section 5a has the plurality of projections 69, 70, defined by a plurality of strip-shaped projections 67, 68, in any section along the direction FD in which the end faces 12, 12' are arranged. As shown in Fig. 11(c), the flat plate section 5a has the plurality of recesses 66, defined by the plurality of groove-shaped recesses 64, 65, in any section along the direction FW in which the pair of lateral sides 11, 11' are arranged. In other words, the flat plate section 5a has the plurality of projections 69, 70, defined by the plurality of strip-shaped projections 67, 68, in any section along the direction FW in which the lateral sides 11, 11' are arranged. (Description of the groove-shaped recesses of a flat plate section shown in FIG. 12(a) according to the seventh embodiment) As shown in Fig. 12(a), the corrugated rib 5F according to the seventh embodiment has a first groove-shaped depression 71 and a second groove-shaped depression 72 on a surface of its flat plate section 5a. The first groove-shaped depression 71 extends linearly between a corner where the lateral side 11 and the end side 12' meet, and a corner where the lateral side 11' and the end side 12 meet. The second groove-shaped depression 72 extends linearly between a corner where the lateral side 11 and the end side 12 meet, and a corner where the lateral side 11' and the end side 12' meet. The first groove-shaped recess 71 and the second groove-shaped recess 72 intersect, thus forming an X-shape. (Description of the depressions and projections of the flat plate section in the arbitrary sections shown in Fig. 12(b), Fig. 12(c), Fig. 12(d) and Fig. 12(e) according to the seventh embodiment) As shown in Fig. 12(b) and Fig. 12(c), the flat plate section 5a has recesses 73, 74, defined by the groove-shaped recesses 71, 72, in any section along the direction FD in which the pair of end faces 12, 12' is arranged. In other words, the flat plate section 5a has projections 77, 78, defined by strip-shaped projections 75, 76, in any section along the direction FD in which the end faces 12, 12' are arranged. It should be noted that, as shown in Fig. 12(b), a recess 73 (74), defined by the groove-shaped recess 71 (72), or a projection 77 (78), defined by the groove-shaped projection 75 (76), is provided in the section of the flat plate section 5a along line MM, while, as shown in Fig.12(c) shown, two recesses 73 (74) defined by the corresponding groove-shaped recesses 71 (72) or two projections 77 (78) defined by the strip-shaped projections 75 (76) are provided in the section along the line M'-M'. As shown in Fig. 12(d) and Fig. 12(e), the flat plate section 5a has recesses 73, 74, defined by groove-shaped recesses 71, 72, in any section along the direction FW in which the pair of lateral sides 11, 11' is arranged. In other words, the flat plate section 5a has projections 77, 78, defined by strip-shaped projections 75, 76, in any section along the direction FW in which the lateral sides 11, 11' are arranged. It should be noted that, as shown in Fig. 12(d), a recess 73 (74), defined by the groove-shaped recess 71 (72), or a projection 77 (78), defined by the groove-shaped projection 75 (76), is provided in the section of the flat plate section 5a along the line NN, while, as shown in Fig.12(e) shown, two recesses 73 (74) defined by the corresponding groove-shaped recesses 71 (72) or two projections 77 (78) defined by the corresponding strip-shaped projections 75 (76) are provided in the section along the line N'-N'. (Description of the hemispherical depressions of a flat plate section shown in FIG. 13(a) according to the eighth embodiment) As shown in Fig. 13(a), the corrugated rib 5G according to the eighth embodiment has on a surface of its flat plate section 5a the plurality of hemispherical depressions 79 in an offset arrangement in the direction of FW, in which a pair of lateral sides 11, 11' is arranged, and in the direction of FD, in which a pair of end sides 12, 12' is arranged. The distance Pk for arranging the hemispherical depressions 79, a diameter of each hemispherical depression 79 and other parameters are determined such that the hemispherical depressions 79, which lie next to each other in the direction FD, in which the end sides 12, 12' are arranged, partially overlap when viewed in the direction FW, in which the lateral sides 11, 11' are arranged. The distance Pm for arranging the hemispherical depressions 79, the diameter of each hemispherical depression 79 and other parameters are determined such that the hemispherical depressions 79, which lie next to each other in the direction FW in which the lateral sides 11, 11' are arranged, partially overlap when viewed in the direction FD in which the end sides 12, 12' are arranged. Description of the depressions and projections of the flat plate section in the arbitrary sections shown in FIG. 13(b) and FIG. 13(c) according to the eighth embodiment) As shown in Fig. 13(b), the flat plate section 5a has the plurality of depressions 80, defined by the corresponding plurality of hemispherical depressions 79, in any section along the direction FD in which the pair of end faces 12, 12' is arranged. In other words, the flat plate section 5a has the plurality of projections 82, defined by a corresponding plurality of hemispherical projections 81, in any section along the direction FD in which the end faces 12, 12' are arranged. As shown in Fig. 13(c), the flat plate section 5a has the plurality of depressions 80, defined by the corresponding plurality of hemispherical depressions 79, in any section along the direction FW in which the pair of lateral sides 11, 11' is arranged. In other words, the flat plate section 5a has the plurality of projections 82, defined by the corresponding plurality of hemispherical projections 81, in any section along the direction FW in which the lateral sides 11, 11' are arranged. (Description of the effects of the second to eighth embodiments) Even in each of the corrugated ribs 5A, 5B, 5C, 5D, 5E, 5F, 5G according to the second to eighth embodiments, the flat plate section 5a has at least one recess 41, 47, 53, 59, 66, 73 or 74 defined by the groove-shaped recess 40, 46, 52, 58, 64, 65, 71 or 72, or at least one projection 44, 45, 50, 51, 56, 57, 62, 63, 69, 70, 77 or 78 defined by the strip-shaped projection 42, 43, 48, 49, 54, 55, 60, 61, 67, 68, 75 or 76, or at least one recess 80 defined by the hemispherical depression 79 is defined, or provided with at least one projection 82, defined by the hemispherical projection 81, in any section along the two directions, that is, direction FW, in which the pair of lateral sides 11, 11' is arranged and direction FD, in which the pair of end sides 12, 12' is arranged.This can increase the section modulus along the FD direction, in which the end faces 12, 12' are arranged, as well as the section modulus along the FW direction, in which the lateral faces 11, 11' are arranged. Therefore, the corrugated fins 5A to 5G according to the second to eighth embodiments can provide the same effects as the corrugated fin 5 according to the first embodiment. Similar to the radiator 1 according to the first embodiment, radiators with such corresponding corrugated fins 5A to 5G have increased product accuracy, thus facilitating their manufacture. The embodiments and variations of the corrugated fin and the heat exchanger with the corrugated fin according to the present invention have been described above. However, the present invention is not limited to the structures described in the embodiments and variations above and allows appropriate variations to each of the structures without deviating from the purpose of the invention, such as appropriately combining the structures of the embodiments and variations described above. Commercial applicability A corrugated fin and a heat exchanger with the corrugated fin according to the present invention have the property of being able to reliably prevent bending at an unexpected location during manufacturing, thereby increasing product accuracy and simplifying production. Therefore, they are suitable for use in or as a radiator, oil cooler, aftercooler, or similar device. Description of the reference symbols in the drawings 1 Radiator (heat exchanger) 4 Pipe 5, 5A, 5B, 5C, 5D, 5E, 5F, 5G Corrugated fins 5a Flat plate section 5b Connecting section 11, 11' Lateral sides 12, 12' End sides 13 Grooved recess (first embodiment) 13A Grooved recess (variation of the first embodiment) 13B Grooved recess (variation of the first embodiment) 15 Strip-shaped projection (first embodiment) 16 Recess (first embodiment) 17, 18 Projections (first embodiment) 20 Flat surface 40 Grooved recess (second embodiment) 41 Recess (second embodiment) 42, 43 Strip-shaped projections (second embodiment) 44, 45 Projections (second embodiment) 46 Grooved recess (third embodiment) 47 Recess (third embodiment) 49, 48 Strip-shaped projections (third embodiment) 50, 51 projections (third embodiment) 52 groove-shaped recess (fourth embodiment) 53 recess (fourth embodiment) 54,55 strip-shaped projections (fourth embodiment) 56, 57 projections (fourth embodiment) 58 groove-shaped recess (fifth embodiment) 59 recess (fifth embodiment) 60, 61 strip-shaped projections (fifth embodiment) 62, 63 projections (fifth embodiment) 64, 65 groove-shaped recesses (sixth embodiment) 66 recess (sixth embodiment) 67, 68 strip-shaped projections (sixth embodiment) 69, 70 projections (sixth embodiment) 71, 72 groove-shaped recesses (seventh embodiment) 73, 74 recesses (seventh embodiment) 75, 76 strip-shaped projections (seventh embodiment) 77, 78 projections (seventh embodiment) 79 hemispherical recess (eighth embodiment) 80 recess (eighth embodiment) 81 hemispherical projection (eighth embodiment) 82 projection (eighth embodiment),

Claims

Corrugated fin (5A) for a heat exchanger (1), comprising a flat plate section (5a) and a connecting section (5b), wherein the flat plate section (5a) has a pair of lateral faces (11, 11') opposite each other in one direction (FW) and a pair of end faces (12, 12') opposite each other in one direction (FD), wherein the connecting section (5b) is connected to a lateral face of the pair of lateral faces (11, 11') of the flat plate section (5a), and wherein the flat plate sections (5a) and connecting sections (5b) are alternately formed into a corrugated shape by bending, wherein the connecting section (5b) has a flat surface (20) which is connected to a tube (4) through which a heat exchange medium circulates, and wherein the flat plate section (5a) has on a surface a plurality of groove-shaped depressions (40) or a plurality of strip-shaped projections (43) which relative to the pair of lateral sides (11,11`) extend inclinedly, wherein each of the plurality of groove-shaped depressions (40) has a first groove-shaped depression (40a) and a second groove-shaped depression (40b), wherein the first groove-shaped depression (40a) extends inclinedly in a direction from a first lateral side (11) to a second lateral side (11`) of the pair of lateral sides (11, 11') starting from the midpoint between the first lateral side (11) and the second lateral side (11`) in a direction in which the pair of lateral sides (11, 11`) is arranged, wherein the second groove-shaped depression (40b) extends inclinedly in a direction from the second lateral side (11`) to the first lateral side (11) of the pair of lateral sides (11, 11`) starting from the midpoint between the first lateral side (11) and the second lateral side (11`) in the direction in which the pair of lateral sides (11, 11`) is arranged,wherein each of the plurality of groove-shaped depressions (40) is configured such that the respective first and second groove-shaped depressions (40a, 40b) are connected to form a V-shape and the center point from which the first groove-shaped depression (40a) originates coincides with the center point from which the second groove-shaped depression (40b) originates, wherein the flat plate section (5a) has at least one depression (41) or projection (45) in any section in two directions, wherein the two directions are a direction (FW) in which the pair of lateral sides (11, 11') is arranged and a direction (FD) in which the pair of end sides (12, 12') is arranged,and wherein in the flat plate section (5a) at adjacent groove-shaped depressions (40) of the plurality of groove-shaped depressions (40) a depression (41) is formed on a straight line running on the open V-side in the direction (FW) between two endpoints of a respective groove-shaped depression (40), which is part of the groove-shaped depression (40) adjacent on the open V-side, wherein the two endpoints of the respective groove-shaped depression (40) are opposite each other in the direction (FW) and are each formed in one of the opposite lateral sides (11, 11') on the open V-side of the respective groove-shaped depression (40) and are oriented in the direction (FD) towards the end side (12') opposite on the open V-side of the respective groove-shaped depression (40). Corrugated fin (5A) for a heat exchanger (1), comprising a flat plate section (5a) and a connecting section (5b), wherein the flat plate section (5a) has a pair of lateral faces (11, 11') opposite each other in one direction (FW) and a pair of end faces (12, 12') opposite each other in one direction (FD), wherein the connecting section (5b) is connected to a lateral face of the pair of lateral faces (11, 11') of the flat plate section (5a), and wherein the flat plate sections (5a) and connecting sections (5b) are alternately formed into a corrugated shape by bending, wherein the connecting section (5b) has a flat surface (20) which is connected to a tube (4) through which a heat exchange medium circulates, and wherein the flat plate section (5a) has on a surface a plurality of groove-shaped depressions (40) or a plurality of strip-shaped projections (43) which relative to the pair of lateral sides (11,11`) extend inclinedly, each of the strip-shaped projections (43) having a first strip-shaped projection and a second strip-shaped projection, the first strip-shaped projection extending inclinedly in a direction from a first lateral side (11) to a second lateral side (11`) of the pair of lateral sides (11, 11') starting from the midpoint between the first lateral side (11) and the second lateral side (11') in a direction in which the pair of lateral sides (11, 11`) is arranged, the second strip-shaped projection extending inclinedly in a direction from the second lateral side (11`) to the first lateral side (11) of the pair of lateral sides (11, 11`) starting from the midpoint between the first lateral side (11) and the second lateral side (11') in a direction in which the pair of lateral sides (11, 11`) is arranged,wherein each of the plurality of strip-shaped projections (43) is configured such that the respective first and second strip-shaped projections are connected to form a V-shape and the center point from which the first strip-shaped projection originates coincides with the center point from which the second strip-shaped projection originates, wherein the flat plate section (5a) has at least one depression (41) or projection (45) in any section in two directions, wherein the two directions are a direction (FW) in which the pair of lateral sides (11, 11') is arranged and a direction (FD) in which the pair of end sides (12, 12') is arranged,and wherein in the flat plate section (5a) at adjacent strip-shaped projections (43) of the plurality of strip-shaped projections (43) a projection (45) is formed on a straight line running on the open V-side in the direction (FW) between two endpoints of a respective strip-shaped projection (43), which is part of the strip-shaped projection (43) adjacent on the open V-side, wherein the two endpoints of the respective strip-shaped projection (43) are opposite each other in the direction (FW) and are each formed in one of the opposite lateral sides (11, 11') on the open V-side of the respective strip-shaped projection (43) and are oriented in the direction (FD) towards the end side (12') opposite on the open V-side of the respective strip-shaped projection (43). The corrugated rib (5) according to claim 1 or 2, wherein a surface (20) of the connecting section (5b) is formed into a flat surface. The corrugated rib (5) according to claim 1 or 2, wherein a surface (20) of the connecting section (5b) is formed into a curved surface. Heat exchanger comprising a corrugated fin (5) according to claim 1, 2, 3 or 4.

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