JPWO2014050418A1 - Fin-and-tube heat exchanger for air conditioner - Google Patents

Abstract

To provide a fin-and-tube heat exchanger for an air conditioner in which bending of a fin at a slit-like raised portion provided on a fin is hardly generated. A large number of fins 12 are arranged in the y direction perpendicular to the x direction, which is the flow direction of the heat exchange fluid, in parallel with each other at a predetermined interval to form a fin group. A plurality of groups are arranged in a row in the z-direction perpendicular to the x-direction and the y-direction, with each fin group spaced apart from each other, and are transmitted so as to pass through the plurality of fin groups sequentially. In a fin-and-tube heat exchanger configured by arranging heat tubes in a meandering form, a notch for defining the width (W) of slit-like cut-and-raised portions 22 and 24 formed on the surface of the fin 12 The lines 30 and 30 were not positioned on a straight line in the z direction.

Description

  The present invention relates to a heat exchanger in which heat is exchanged between a heat exchange fluid such as air and a refrigerant, and in particular, a fin-and-tube heat exchange that is preferably used in a heat exchanger for an air conditioner. It is about a vessel.

  Conventionally, as a heat exchanger for an air conditioner, a cross fin tube type heat exchanger has been mainly used. This cross fin tube heat exchanger is formed by joining a plurality of heat transfer tubes bent in a hairpin to a plurality of fins in the vertical direction and expanding the heat transfer tubes to join the fins and the heat transfer tubes. It is structured. And while circulating a predetermined | prescribed refrigerant | coolant in a heat exchanger tube, a heat exchange is performed between a refrigerant | coolant and air by making it flow along a fin perpendicularly | vertically with respect to a heat exchanger tube. It has become.

  Such a cross fin tube type heat exchanger is generally composed of aluminum or aluminum alloy fins and copper or copper alloy heat transfer tubes, and a plurality of heat transfer tubes on one large fin. It is set as the structure which let you pass. For example, in an indoor heat exchanger for an air conditioner, as disclosed in Japanese Patent Laid-Open No. 2008-138913 (Patent Document 1), an arc-shaped heat exchanger that covers a scroll fan is disclosed. In addition, a multi-stage bent heat exchanger is used. Moreover, in the outdoor heat exchanger of an air conditioner, a flat plate heat exchanger or a heat exchanger having a shape obtained by bending a flat plate is generally used.

  On the other hand, as a heat exchanger used for a refrigerator or the like, in addition to the cross fin tube type heat exchanger as described above, Japanese Utility Model Laid-Open No. 62-156275 (Patent Document 2) and Japanese Utility Model Laid-Open No. 59-108079 (Patent Document 3). Comprises a plurality of plate fins arranged in parallel and refrigerant pipes penetrating these fins, the refrigerant pipes being arranged in a staggered manner with respect to the air flow direction, and the plate fins being An independent fin type fin-and-tube heat exchanger, which is constituted by dividing the refrigerant pipe into rows and stages, has been clarified. According to such a fin-and-tube heat exchanger, since the heat exchanger is configured by bending the refrigerant pipe to which the independent fin group is attached in a zigzag manner, In addition to being able to reduce the productivity, it is possible to improve the productivity and to improve the heat exchange performance by the leading edge effect obtained by using the independent fin.

  Therefore, it is considered to apply such a fin-and-tube type heat exchanger also in a heat exchanger for an air conditioner, but in an actual heat exchanger for an air conditioner, Most of the above use the cross fin tube type heat exchanger as described above, and the fin and tube type heat exchanger has not been adopted so far. This is because the heat exchanger for the air conditioner is a heat exchanger (2 to 3 stages) having a relatively thin structure in the air flow direction as compared with the heat exchanger for the refrigerator. This is because the effect obtained by using the fin is considered to be small. Moreover, since the heat exchanger of patent document 3 is designed as a heat exchanger for refrigerators, in order to suppress obstruction | occlusion between the fins by frost formation, a heat exchanger tube pitch and fin space | interval (fin pitch) are large. Therefore, since the heat transfer area on the air side becomes small, it is difficult to apply as it is as a heat exchanger for an air conditioner. In addition, it is difficult to apply to the arc-shaped heat exchanger as the indoor heat exchanger of the air conditioner because of its fin shape.

  However, in particular, in an indoor unit of an air conditioner, a heat exchanger that can sufficiently cope with the remarkable compactness seen in recent years is desired. To meet such a demand, a fin-and-tube type heat exchanger is desired. The exchanger has the possibility of being able to cope with downsizing, such as expected to improve the heat exchange performance due to the leading edge effect of the independent fin, and also in terms of manufacturing the air conditioner, It is possible to simplify the process by sharing the form of the heat exchanger of the outdoor unit as much as possible. From these viewpoints, there is a demand for a fin-and-tube heat exchanger having a structure suitable as a heat exchanger for an air conditioner. For example, in JP-A-10-54683 (Patent Document 4) An example of applying independent fins of various shapes and applying a fin-and-tube heat exchanger for an indoor unit of an air conditioner has been clarified.

  By the way, in such a fin-and-tube heat exchanger, as one method for improving the heat transfer performance, it has been conventionally performed to provide a slit in the fin. For example, Japanese Patent Application Laid-Open No. 10-292994 (Patent Document 5) discloses a heat exchanger for a refrigerator provided with a fin in which a narrow slit-like cut-and-raised part is provided in parallel with the longitudinal part of the raised part. Has been revealed. Thus, by providing slits in the fins, it is possible to more effectively exchange heat between the heat exchange fluid (air) flowing between the fins and the fins. The heat exchange performance can be improved.

  However, in the fin-and-tube heat exchanger, in particular, in the case where one heat transfer tube is inserted into one fin, heat in which a plurality of heat transfer tubes are inserted into one large fin. The size of the fin is smaller than in the case of the exchanger, and a plurality of slit-like cut-and-raised portions are formed on such a small fin, so that the fin is likely to be bent starting from the slit-raised portion. It was inherent. In other words, when an excessive external force is applied to the fins, such as when assembling a heat exchanger, the fins bend starting from the slit-like raised parts formed in such fins, and the fin pitch may be disturbed. , Causing problems such as closing the gaps between the fins, resulting in an increase in ventilation resistance and a heat transfer capability between the heat exchange fluid (air) passing between the fins and the fins. This will cause a significant drop.

JP 2008-138913 A Japanese Utility Model Publication No. 62-156275 Japanese Utility Model Publication No.59-108079 JP-A-10-54683 Japanese Patent Laid-Open No. 10-292994

  Here, the present invention has been made in the background of such circumstances, and the problem to be solved is provided at the central portion of each fin constituting a fin group composed of a large number of fins. In a fin-and-tube heat exchanger in which a single heat transfer tube is inserted and attached to the insertion part, the air conditioning in which the bending of the fin at the slit-like cut-and-raised part provided in the fin is difficult to occur The object is to provide a fin-and-tube heat exchanger for a machine.

  In the present invention, in order to solve such problems, the rectangular shape is arranged in parallel to each other at a certain distance in the y direction perpendicular to the x direction in which the heat exchange fluid flows. A plurality of fin groups composed of a plurality of fins exhibiting the above are arranged in a row at a certain distance from each other in the z direction perpendicular to the x direction and the y direction, and provided at the central portion of one fin. In a configuration in which one heat transfer tube is inserted and attached to the insertion portion, a fin-and-tube heat exchange structure in which the heat transfer tubes are arranged in a meandering form so as to sequentially pass through the fin groups. The fins constituting the fin group are positioned so as to correspond to two regions divided into left and right at a center line in a direction parallel to the x direction passing through the insertion portion of the heat transfer tube. In addition, A pair of narrow slit-like first and second cut-and-raised portions extending parallel to each other in the z-direction are provided at a predetermined distance in the x-direction, and the first cut-and-raised portion pair Is arranged corresponding to the region where the insertion part is not sandwiched on both sides of the center line, and the pair of second cut and raised parts corresponds to the region sandwiching the insertion part on both sides of the center line. Among the first and second cut-and-raised parts, at least a pair of first cut-and-raised parts located corresponding to the regions on both sides of the center line are arranged in their width. The fin-and-tube type for an air conditioner is formed so that a cut line that defines the vertical axis is not positioned on a straight line in the z-direction and is offset in the x-direction The main point is the heat exchanger. .

  In addition, according to one of the desirable aspects of the fin-and-tube heat exchanger for an air conditioner according to the present invention as described above, the first is located corresponding to the regions on both sides of the center line. The pair of cut-and-raised portions are formed to have the same width and are displaced in the x direction by a distance of 5% to 95% of the width.

  Further, according to another preferred embodiment of the fin-and-tube heat exchanger for an air conditioner according to the present invention, the first and second cut-and-raised portions are cut-offs defining respective widths. It has a trapezoidal shape obtained by forming a region sandwiched between two lead wires so as to rise from the fin surface.

  Furthermore, according to one of the preferable aspects of the present invention, the second cut-and-raised portion pair positioned corresponding to the regions on both sides of the center line has a cut line defining their width. The first cut-and-raised portion is formed so as not to be positioned on a straight line in the z-direction and is displaced in the x-direction. In the z direction, it is formed with a length longer than that of the second cut and raised portion.

  In addition, according to another preferred embodiment of such a fin-and-tube heat exchanger for an air conditioner according to the present invention, the fins are in regions on both sides divided by the center line. Each having two first cut-and-raised portions and two second cut-and-raised portions, and in each region, the two first cut-and-raised portions are respectively located at both end sides in the x direction. On the other hand, the two second cut-and-raised parts are arranged so as to be positioned between the two first cut-and-raised parts.

  Moreover, in another preferable aspect of the present invention, the insertion portion of the heat transfer tube includes a through hole formed in a central portion of the fin and a predetermined erected at a peripheral portion of the through hole. In another preferred embodiment, the collar portion has a flare portion whose opening diameter is gradually increased toward the outer side at the tip thereof. ing.

  Furthermore, according to one of the desirable aspects of the present invention, at both end portions in the x direction of the fin, an edge convex deformation portion having a height lower than that of the first and second cut-and-raised portions, It is provided over the entire length in the z direction, and according to another desirable aspect, the edge convex deformation portion is arranged to extend in the z direction in a triangular cross-sectional shape. .

  Furthermore, in another desirable aspect of the present invention, a central projection having a height lower than that of the first and second cut-and-raised portions is formed at the central portion in the z direction of the fin. The deformed portion is provided in the x direction in a length that does not reach the insertion portion, and in another desirable aspect, the central projecting deformed portion has the triangular cross-sectional shape in the x direction. It will be arrange | positioned so that it may extend in a direction.

  Therefore, according to the fin-and-tube heat exchanger for an air conditioner configured according to the present invention as described above, each fin constituting the fin group is parallel to the x direction passing through the insertion portion of the heat transfer tube. Among the corresponding slit-like cut-and-raised portions respectively provided in the regions on both sides of the center line in the direction, at least the one corresponding to the first cut-and-raised portion is arranged offset in the x direction. In the case where a large external force is applied to the fin from where the cut line defining the width of the first cut-and-raised part on both sides is set not to be positioned on a straight line in the z direction, However, in such a slit portion (cut-and-raised portion) of the fin, there is a possibility that the bending of the fin may be effectively eliminated or reduced.

  And by making it difficult for the fins to be bent in this way, the heat transfer improving action by the slit-like cut and raised portions provided in such fins can be more effectively exhibited, Therefore, the heat exchange performance of the heat exchanger can be advantageously improved.

It is a perspective explanatory view showing an example of the fin and tube type heat exchanger for air conditioners according to the present invention. It is a plane explanatory view which expands and shows the fin used for the fin and tube type heat exchanger for air conditioners shown in FIG. FIG. 3 is a perspective explanatory view showing the fin shown in FIG. 2 in the form of a perspective view. FIG. 3 is a cross-sectional explanatory view showing a II cross section in FIG. It is a figure which expands and shows the cut-and-raised part formed in the fin shown by FIG. 2, Comprising: (a) has shown the planar form, (b) shows the II-II cross section in (a). ing. It is explanatory drawing of the state by which the cut-and-raised part in the fin used for the fin and tube type heat exchanger for air conditioners according to this invention is displaced, (a) is the amount of displacement. When 0%, (b) shows when the displacement amount is 50%, and (c) shows when the displacement amount is 100%. It is explanatory drawing which shows schematically the fin used for the test in an Example, (a) is plane explanatory drawing, (b) is sectional explanatory drawing which shows the III-III cross section in (a). . It is explanatory drawing which shows roughly the test method performed in the Example.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 schematically shows one embodiment of a fin-and-tube heat exchanger for an air conditioner according to the present invention in the form of a perspective view. In the heat exchanger 10, a plurality of fin groups 14 including a plurality of fins 12 arranged in parallel to each other and at a predetermined distance are arranged in parallel at a predetermined distance. A heat transfer tube 16 is arranged in a meandering manner via a bending portion 18 so as to sequentially penetrate the plurality of fin groups 14.

  More specifically, the fin 12 is a thin plate-like fin having a rectangular shape and formed of a predetermined metal plate made of aluminum, an aluminum alloy, or the like, as in the prior art. Further, as shown in FIG. 2 and FIG. 3, the surface of the fin 12 is formed with an insertion hole 20, which is an insertion portion through which the heat transfer tube 16 is inserted, formed in the central portion of the fin 12. 2 on both sides of the direction (left and right direction in FIG. 2), in other words, the center line in the direction parallel to the x direction passing through the insertion hole 20: 12 A pair of slit-like first and second cut-and-raised portions 22 and 24 erected at a predetermined height from the surface is a predetermined interval in the x direction (vertical direction in FIG. 2), which is the direction in which the heat exchange fluid flows. A plurality are provided with a gap therebetween. That is, there, the pair of first cut-and-raised portions 22 are positioned in a region that does not straddle the insertion hole 20, in other words, located on the left and right of the center line C, and directly sandwich the insertion hole 20. In FIG. 2, the second cut-and-raised portions 24 are provided in the left and right regions directly sandwiching the insertion hole 20 while being provided in the upper and lower regions in FIG. Each is provided. Further, at both end portions of the fin 12 in the x direction, an edge convex deformation portion 26 having a height lower than the slit-like first and second cut-and-raised portions 22 and 24 extends over the entire length in the z direction. Furthermore, a central convex deformation portion 28 is provided at a central portion in the z direction so as to be located on the center line C and not to reach the insertion hole 20 (see FIG. 3 and FIG. 4).

  Further, the first and second cut-and-raised portions 22 and 24 formed on the surface of the fin 12 in this manner are also apparent from FIG. 5A showing an enlarged view of one of the cut-and-raised portions 22 and 24. As described above, the width (W) and the length (L) are defined by the cut lines 30, 30 cutting the fin 12 in the thickness direction, and the fins 12 are sandwiched between the cut lines 30, 30. As shown in FIG. 5B, the cut portion is cut and raised from the surface of the fin 12 with a predetermined height (H), and the cross-sectional shape perpendicular to the length direction of the cut and raised portion 22 is trapezoidal ( Hat shape). The first and second cut-and-raised portions 22 and 24 can be easily formed by pressing or the like in the same manner as in the prior art. Here, the fin 12 is formed with two types of cut-and-raised portions 22 and 24 having the same width (W) but different lengths (L). The part 22 has a length longer than that of the second cut and raised part 24. The fin 12 is provided with a total of eight cut-and-raised portions 22 and 24 each having two such lengths. The two cut lines 30 and 30 forming the first and second cut and raised portions 22 and 24 are formed so as to extend parallel to each other in the z direction and pass through the insertion hole 20 in the x direction. A center line in a direction parallel to the center: C is arranged in each region divided into two left and right by C, and the center line: first and second are arranged at positions that are substantially line symmetric with respect to C and constitute a pair. The two raised portions 22, 22; 24, 24 have the same length (L).

  Further, the left and right cut-and-raised portions 22 and 24 arranged on the surface of the fin 12 in such a manner are such that the cut lines 30 and 30 that define their width (W) are not positioned in a straight line in the z direction. And formed. That is, here, as shown in FIG. 2, when arranging a pair of first and second cut-and-raised portions 22, 22; 24, 24 located on both sides of a center line C passing through the insertion hole 20, The cut line 30 that defines the width of the cut-and-raised portions 22 and 24 on one side and the cut line 30 that defines the width of the cut-and-raised portions 22 and 24 on the other side are displaced in the x-direction. Amount): deviated by d so that the cut lines 30, 30 are not positioned in a straight line in the z direction, the left and right first and second cut and raised portions 22, 22; Is arranged. The deviation amount d in the pair of the first and second cut-and-raised portions 22 and 24 is preferably 5% of the width (W) of the first and second cut-and-raised portions 22 and 24. It will be displaced in the x direction by a distance of ~ 95%. By arranging a pair of the first and second cut-and-raised portions 22 and 24 on the fin 12 with such a deviation amount, the fins at the first and second cut-and-raised portions 22 and 24 are bent, In other words, the possibility of bending of the fins 12 due to the folding action in the z direction starting from the cut line 30 portion forming the first and second cut and raised portions 22, 24 is effectively eliminated or It can be suppressed.

  By the way, the deviation amount d in the pair of the first and second cut-and-raised parts 22 and 24 is, for example, on both the left and right sides with the center line C as shown in FIG. The state in which the cut lines 30 of the first and second cut-and-raised portions 22, 22; 24, 24 arranged correspondingly are positioned on a straight line in the z direction is defined as a deviation amount: 0%. 6 (b), a state in which the first and second cut-and-raised parts 22 and 24 are displaced in the x direction by a distance half the width (W) is set to 50%, and FIG. As shown in c), the same distance as the width (W) of the first and second cut-and-raised portions 22 and 24 is set in the x direction so that the one cut line 30 and the other cut line 30 are positioned on a straight line. The displaced state is expressed as the amount of displacement: 100%.

  In addition, a fin collar 32 erected in a cylindrical shape from the peripheral edge of the insertion hole 20 is integrally provided around the insertion hole 20 provided in the central portion of the fin 12 through which the heat transfer tube 16 is inserted and attached. Furthermore, a flare portion 34 whose opening diameter is gradually increased toward the tip (outward) is formed on the tip side of the fin collar 32 (see FIG. 3). By providing the fin collar 32 as described above, the fin 12 and the heat transfer tube 16 can be joined more stably and reliably, and the fin group 14 can be configured by arranging the plurality of fins 12. In addition, when the flare portion 34 comes into contact with the adjacent fins 12, the effect of stably maintaining the fin pitch is exhibited.

  Furthermore, at both end portions in the x direction of the fin 12, as shown in FIGS. 3 and 4, the height is lower than the first and second cut-and-raised portions 22, 24. The edge convex deformation portion 26 having a substantially triangular shape is provided over the entire length in the z direction. By forming the edge convex deformation part 26 so as to extend in the z direction, it is possible to effectively prevent the occurrence of the bending of the fin whose fold is in the x direction. Further, a central convex deformation portion 28 having a cross-sectional shape similar to that of the edge convex deformation portion 26 is provided at a central portion in the z direction of the fin 12 so as not to reach the insertion hole 20. Therefore, the bending of the fin whose fold is in the z direction is more difficult to occur. Here, the central convex deformation portion 28 is formed in such a length that it does not reach the insertion hole 20 when the fin 12 is manufactured by press working, and is erected around the insertion hole 20 or the periphery thereof. In order to hold the mold for forming the fin collar 32, a certain level of flat portion is required around the insertion hole 20, so that the central convex deformation portion 28 is formed to the root of the insertion hole 20 (fin collar 32). This is because it cannot be extended.

  Then, as shown in FIG. 1, the plurality of fins 12 having the above-described shape are in the y direction that is perpendicular to the x direction that is the flow direction of the air that is the heat exchange fluid, that is, The fin group 14 is formed by arranging the plates in parallel with each other at a predetermined interval (fin pitch) so that the thickness direction of the plate is perpendicular to the air flow direction. In addition, although the space | interval (fin pitch) between each fin 12 will be set suitably similarly to the past, generally it is all the same space | intervals and shall be about 1.0 mm-3.0 mm. Is desirable. This is because when the fin pitch is less than 1.0 mm, the influence on the heat exchange performance due to clogging of the fins due to frost formation cannot be ignored. On the other hand, when the fin pitch exceeds 3.0 mm, the distance between the fins becomes too large, so that the heat exchanger of the same size inevitably reduces the number of fins. Since the area is reduced, sufficient heat transfer performance cannot be exhibited, and heat exchange performance may be deteriorated.

  Further, a plurality of such fin groups 14 composed of a large number of fins 12 are arranged in a row at a certain distance from each other in the z direction, which is a direction perpendicular to the x direction and the y direction. The heat exchangers 10 are arranged so as to form a flat plate shape as a whole, and the heat exchanger 10 is configured as described later.

  On the other hand, the heat transfer tube 16 is a tubular body having a substantially circular cross section formed using a metal material made of aluminum or an alloy thereof, copper or an alloy thereof, and the like. The straight portion sequentially passes through the insertion hole 20 formed in each central portion of the plurality of fins 12 constituting the fin group 14, and the insertion hole formed in the outer peripheral surface of the heat transfer tube 16 and the plurality of fins 12. Twenty inner peripheral surfaces are in close contact with each other. In addition, as for the coupling | bonding of such a fin 12 and the heat exchanger tube 16, conventionally well-known various methods will be selected suitably, and it will be used, but especially the center part of the fin 12 of the heat exchanger tube 16 is used. A hole having an inner diameter slightly larger than the outer diameter is opened, and the heat transfer tube 16 is inserted into the hole, and then a tube expansion plug is inserted into the heat transfer tube 16 to expand the outer diameter of the heat transfer tube 16. As a result, a method of bringing the outer peripheral surface of the heat transfer tube 16 into close contact with the inner peripheral surface of the insertion hole 20 provided in the fin 12 is preferably employed.

  Then, as shown in FIG. 1, such a heat transfer tube 16 is perpendicular to the flow direction (x direction) of air, which is a heat exchange fluid, and the arrangement direction (y direction) of the plurality of fins 12. By arranging the plurality of fin groups 14 arranged in the (z direction) sequentially so as to have a meandering shape, the fins for an air conditioner that have a substantially flat plate shape as a whole The tube-type heat exchanger 10 is configured. The fin-and-tube heat exchanger 10 shown in FIG. 1 is arranged in the y direction in a form in which the fins 12 shown in FIG. That is, FIGS. 1 and 2 are shown in a state where the x-axis and the z-axis are rotated by 90 °. Further, in FIG. 1, the first and second cut-and-raised portions 22, 24 and the edge portions of the plurality of fins 12 constituting the fin group 14 are only provided on the frontmost fin 12 in the drawing. Although the convex deformation portion 26 and the like are drawn, in order to make the drawing easy to understand, only the depiction in the overlapping fin 12 portion is omitted, and other than the fin 12 in the foremost side, Needless to say, the cut-and-raised portion 22 (24), the edge convex deformation portion 26, and the like are provided.

  Therefore, according to the fin-and-tube heat exchanger 10 for an air conditioner configured according to the present invention as described above, each fin 12 constituting the fin group 14 is divided by the center line C. A pair of slit-shaped first and second cut-and-raised portions 22 and 24 extending in the z-direction provided in the left and right two regions on the fin 12 are provided in the first and second cuts provided in one region. The x-direction in which the first and second cut-and-raised portions 22 and 24 provided in the other region that is substantially line-symmetrical with respect to the raised portions 22 and 24 with respect to the center line: C flows through the heat exchange fluid. The cut lines 30 and 30 that define the widths of the cut and raised portions 22 and 22; 24 and 24 are not positioned on a straight line in the z direction. And that As a result, even when a large external force is applied to the fin 12, the possibility that the fins are bent at the portions where the first and second cut-and-raised portions 22 and 24 are formed can be effectively eliminated. Will be reduced.

  And since it becomes difficult to cause the bending in the fin 12 in this way, the occurrence of a problem due to such a bending is advantageously avoided, and the two kinds of slit-like raised portions 22 provided in the fin 12 are provided. 24, the effect of improving the heat transfer characteristics can be exhibited more effectively, and the heat exchange performance of the heat exchanger 10 can be advantageously improved.

  Further, in the heat exchanger 10, a plurality of fin groups constituting the heat exchanger 10, with one heat transfer tube 16 penetrating through a large number of fins 12 constituting one fin group 14. 14 is configured to be independent of each other, the fin efficiency in the heat exchange can be advantageously increased, and the adjacent heat transfer tubes 16 are advantageously blocked from heat interference (conduction) via the fins. Therefore, the heat exchange performance of the heat exchanger 10 can be effectively improved. And by improving the heat exchange performance, it becomes possible to realize compactness of the heat exchanger 10, and it can be suitably employed as a heat exchanger in an indoor unit of a compacted air conditioner. Become.

  As described above, one of the representative embodiments of the present invention has been described in detail. However, this is merely an example, and the present invention is not limited by the specific description according to such an embodiment. It should be understood that this is not to be construed as limiting.

  For example, in the above-described embodiment, eight slit-shaped first and second cut-and-raised portions 22 and 24 having two types of sizes are disposed on the surface of the fin 12. The width, length, number, and shape of the raised portions 22 and 24 are appropriately determined according to the required size and heat transfer performance of the fins 12.

  Further, the deviation amount in the pair of first cut-and-raised portions 22 and 22 and the deviation amount in the pair of second cut-and-raised portions 24 and 24 may be the same or different. Even if it is said, there is no problem. That is, the cut lines 30 of the first and second cut-and-raised portions 22 and 24 existing on both sides in the z direction with the center line C passing through the insertion hole 20 in between are both in a straight line in the z direction. It would be good if it was not located in.

  Further, in the illustrated embodiment, the pair of the two types of cut-and-raised portions 22 and 24 has the cut lines 30 that are not positioned on a straight line in the z direction on both the left and right sides across the center line C. The occurrence of bending of the fins 12 can be advantageously avoided, but in the present invention, at least one of the pair of the two raised portions 22 and 24 is If the cut lines 30 of the first cut-and-raised portions 22 and 22 on both sides in the x direction located in a region that does not straddle the insertion hole 20 (is not sandwiched) are displaced in the x direction on both sides of the center line C It is sufficient that the two pairs of the second raised portions 24, 24 on both sides of the insertion hole 20 are not offset in the x direction (they are located on a straight line). Even if it is configured as Enoi. With respect to the bending of the fin 12 at such a cut-and-raised portion 24 site, the insertion portion, specifically, the fin collar 32 and the flare portion 34 exist between the left and right second cut-and-raised portions 24 and 24. This is because a large resistance can be exhibited.

  In addition, although not listed one by one, the present invention is implemented in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that any one of them falls within the scope of the present invention without departing from the spirit of the invention.

  Hereinafter, representative examples of the present invention will be shown to clarify the present invention more specifically, but the present invention is not limited by the description of such examples. It goes without saying.

Example 1
First, a plate material made of pure aluminum (JIS A1050-H24) having a plate thickness of 0.08 mm is used to manufacture fins used to constitute a fin-and-tube heat exchanger for an air conditioner according to the present invention. Was prepared and subjected to a predetermined pressing process to produce a rectangular fin (50) as shown in FIG. 7 (a). The external dimensions of the fin (50) were such that the x direction, which is the direction in which the heat exchange fluid circulates, had a short side of 20 mm, and the z direction perpendicular to the x direction had a long side of 24 mm.

  In such a rectangular fin (50), at one end side in the x direction (one end side of the long side), at a position 0.5 mm away from the end, FIG. The edge convex deformation part (56) which exhibits a triangular cross-sectional shape as shown in FIG. 2 is formed over the entire length in the z direction with dimensions of width: 1.4 mm and height: 0.5 mm.

  Further, at a position closer to the center of the fin (50) than the edge convex deformation portion (56) on the side where the edge convex deformation portion (56) is formed, a predetermined height from the fin surface. S: Two slit-like raised portions (52, 52 ′) rising at H and extending in parallel with the z direction are respectively formed. Here, one of the two raised portions (52) has a predetermined width in the z direction from a location 2.5 mm away from one side in the x direction and 1 mm away from one side in the z direction. It is formed to extend with (W) and length (L). The other cut-and-raised portion (52 ′) is added to the same 2.5 mm as the first cut-and-raised portion (52) from one side in the x direction, and the amount of deviation (deviation amount): d And a predetermined width (W) and a length in the z direction from a position 1 mm away from the side opposite to the side where the first cut and raised portion (52) is formed. It is formed to extend with a length (L). That is, the two cut-and-raised portions (52, 52 ′) are located on both the left and right sides of the center line C in the direction parallel to the x direction passing through the heat transfer tube insertion hole equivalent portion (54) in the center of the fin (50). It was formed to be located in Here, the dimensions of the two slit-like cut and raised portions (52, 52 ′) are as follows: length (L): 8.5 mm, width (W): 1.6 mm, height (H): 0.8 mm. It was said.

  And about two cut-and-raised part (52, 52 ') made into such a dimension, as shown in following Table 1, the deviation amount in the x direction: d is shown as the cut-and-raised part (52, 52'). ') The fins (50) varied in the range of the deviation ratio of 0 to 100% of the width (W) were prepared. 1-No. Eleven test fins were used.

  Each test fin prepared in this way was set in a test apparatus as shown in FIG. 8, and a weight drop test was conducted to examine whether or not the fins were bent. That is, the end of the prepared test fin in the x direction on the side where the cut and raised portions (52, 52 ') and the edge convex deformation portion (56) are formed protrudes from the fixing jig by 5.9 mm. After fixing so that 1 gf of weight is dropped freely from a height of 100 mm and collided with the center of the x-direction end of the test fin, in the cut-and-raised part (slit part) (52, 52 ′), It was investigated whether or not the fins were bent. Here, the number of tests is 10 times for each test fin, and the number of times the bending occurred in the 10 tests and the case where the bending of the fin occurred 3 times or more is evaluated: × 2 times or less The results of the number of bendings were evaluated as “◯”, and the results are also shown in Table 1 below.

  As apparent from the results in Table 1, the deviation amount (d) of the cut-and-raised portion (52, 52 ') is No. in the range according to the present invention. 3-No. In the test fin No. 9, it was confirmed that the bending of the fin hardly occurs.

-Example 2-
A plate material made of pure aluminum (JIS A1050-H24) with a thickness of 0.10 mm was prepared and subjected to predetermined pressing, and as shown in FIG. 7A, short side: 20 mm, long side: 24 mm A rectangular fin (50) was prepared. The fin (50) has two slit-like cut-and-raised portions (52, 52 ') and an edge-shaped convex deformed portion (56) formed in the same manner as in the first embodiment. The part (52, 52 ′) has a length (L): 9 mm, a width (W): 2 mm, and a height (H): 0.8 mm, and is disposed at one of the raised parts (52). However, the other cut-and-raised portion (52 ′) is the first cut-and-raised portion as in the first embodiment, as a location that is 1.9 mm away from one side in the x-direction and 1 mm from one side in the z-direction. Deviation from the part (52) by a predetermined distance (d). Further, the edge convex deformation part (56) has a width: 1.4 mm and a height from a position 0.2 mm away from the end part on the side where the two raised parts (52, 52 ′) are formed. : It was formed to be 0.5 mm.

  Then, as in Example 1, various fins (50) were produced in which the deviation amount: d was changed in the range of the deviation rate of 0 to 100% as shown in Table 2 below. 12-No. There were 22 test fins.

  Each test fin prepared in this manner was subjected to a weight drop test similar to that in Example 1, and the results are also shown in Table 2 below.

  As apparent from the results in Table 2, the deviation (d) of the cut-and-raised portion (52, 52 ') is No. in the range according to the present invention. 14-No. In 20 test fins, it was confirmed that bending of the fins hardly occurred.

DESCRIPTION OF SYMBOLS 10 Heat exchanger 12 Fin 14 Fin group 16 Heat transfer tube 18 Bending part 20 Insertion hole 22 1st raising part 24 2nd raising part 26 Edge convex deformation part 28 Central convex deformation part 30 Cutting line

Claims (12)

A plurality of fin groups each having a plurality of quadrangular fins arranged in parallel to each other at a certain distance in the y direction perpendicular to the x direction in which the heat exchange fluid flows are formed in the x direction and the y direction. In a form in which a single heat transfer tube is inserted and attached to an insertion portion provided in a central portion of one fin, arranged in a row at a certain distance from each other in the z direction perpendicular to the direction, In the fin-and-tube heat exchanger having a structure in which the heat transfer tubes are arranged in a meandering form so as to sequentially penetrate the fin groups,
The fins constituting the fin group are positioned so as to correspond to two regions divided in the left and right at a center line in a direction parallel to the x direction passing through the insertion portion of the heat transfer tube, respectively. A pair of narrow slit-like first and second cut-and-raised portions extending in parallel with each other in the z-direction are provided at a predetermined distance in the x-direction, and the first pair of cut-and-raised portions is provided. Arranged on both sides of the center line so as not to sandwich the insertion part, and the second cut-and-raised part pair on both sides of the center line corresponding to the area sandwiching the insertion part The first and second cut-and-raised portions of the first cut-and-raised portion positioned at least corresponding to the regions on both sides of the center line have a width thereof. The specified score line is straight in the z direction. Is formed so as not located in an air conditioner for fin-and-tube heat exchanger, characterized in that it is arranged displaced in the x-direction.   A pair of first cut-and-raised portions located corresponding to the regions on both sides of the center line are formed to have the same width, and only a distance of 5% to 95% of the width. The fin-and-tube heat exchanger for an air conditioner according to claim 1, wherein the fin-and-tube heat exchanger is deflected in the x direction.   The first and second cut-and-raised portions have a trapezoidal shape obtained by molding so as to rise from the fin surface in a region sandwiched between two cut lines that define the respective widths. The fin-and-tube heat exchanger for an air conditioner according to claim 1 or 2, wherein the air conditioner has a fin-and-tube heat exchanger.   The pair of second cut-and-raised portions located corresponding to the regions on both sides of the center line are formed such that the cut lines that define the width thereof are not located on a straight line in the z direction. The fin-and-tube heat exchanger for an air conditioner according to any one of claims 1 to 3, wherein the fin-and-tube heat exchanger is disposed in a deviated manner in the x direction.   5. The first cut-and-raised part is formed with a length longer than the second cut-and-raised part in the z-direction. 6. Fin-and-tube heat exchanger for air conditioners.   The fin has two first cut-and-raised portions and two second cut-and-raised portions in the regions on both sides divided by the center line, and in each region, the two The two second cut-and-raised portions are arranged so that the first cut-and-raised portions are respectively located on both end sides in the x direction, while being positioned between the two first cut-and-raised portions. The fin-and-tube heat exchanger for an air conditioner according to any one of claims 1 to 5, wherein a portion is disposed.   The insertion portion of the heat transfer tube is composed of a through hole formed in a central portion of the fin and a collar portion having a predetermined height standing on a peripheral portion of the through hole. The fin-and-tube heat exchanger for an air conditioner according to any one of claims 1 to 6.   The fin-and-tube type heat for an air conditioner according to claim 7, wherein the collar portion has a flare portion whose opening diameter is gradually increased toward the outer end thereof. Exchanger.   An edge convex deformation portion having a lower height than the first and second cut-and-raised portions is provided at both end portions in the x direction of the fin over the entire length in the z direction. The fin-and-tube heat exchanger for an air conditioner according to any one of claims 1 to 8.   10. The fin-and-tube heat exchanger for an air conditioner according to claim 9, wherein the edge convex deformation portion is disposed so as to extend in the z direction in a triangular cross-sectional shape.   A central convex deformation portion having a lower height than the first and second cut-and-raised portions is provided in the x direction at a length that does not reach the insertion portion at a central portion in the z direction of the fin. The fin-and-tube heat exchanger for an air conditioner according to any one of claims 1 to 10, wherein the heat exchanger is a fin-and-tube heat exchanger. The fin-and-tube heat exchanger for an air conditioner according to claim 11, wherein the central convex deformation portion is disposed so as to extend in the x direction in a triangular cross-sectional shape.

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