JP2012207887A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger for a cooler, the heat exchanger having high performance, high quality and excellent productivity.SOLUTION: In a windward long hole 5 of a long plate fin 4a, a straight slit 11 connecting between catch holes 6 at both ends of the long hole 5 is located apart, on one side, from a straight line connecting between centers of the catch holes 6 at both the ends of the long hole 5 by about a half of a dimension of a thickness of a refrigerant tube bent section subjected to a flattening process, a straight pressed dent 10 is formed on a position apart, on a side opposite to the slit 11, from the straight line connecting between the centers of the catch holes 6 at both the ends by about a half of the dimension of the thickness of the refrigerant tube bent section subjected to the flattening process as a section located between both end catch holes 6 of the long hole 5, in such a manner that a remaining thickness at the straight pressed dent 10 becomes thinner than other part of the long plate fin 4a, and a cut and raised part 12 raised by insertion of the refrigerant tube into the long hole 5 is corrected to be substantially parallel to the other part of the plate fin 4.

Description

  The present invention relates to a so-called dogbone type fin-and-tube heat exchanger used for freezing and refrigeration air conditioning and the like.

  Refrigerant leakage from the heat exchanger used in the refrigeration air-conditioning equipment loses the function of the refrigeration air-conditioning equipment itself, so reducing the refrigerant leakage of the heat exchanger is a major issue. In addition, refrigeration of refrigerants in heat exchangers is indispensable from the standpoint of product safety in HC refrigerants, which are flammable as a major candidate for alternative refrigerants, as non-fluorocarbon refrigerants accelerate as a measure against global warming. is there.

  Since the locations where refrigerant leakage occurs are mainly pipe joints, it is inevitable that the need for heat exchangers that do not have joints consisting of a single refrigerant tube in the refrigerant circuit will continue to increase. is there.

  Conventionally, in this type of heat exchanger, the plate fin and the refrigerant tube are tightly fixed by an assembly method called a press-fitting method or a hydraulic method. The plate fin generally has an integral structure, but there are also divided structures (see, for example, Patent Document 1 and Patent Document 2).

  FIG. 3 is a perspective view of a conventional heat exchanger disclosed in Patent Document 1. As shown in FIG.

  FIG. 4 is a perspective view of a conventional heat exchanger disclosed in Patent Document 2, and FIG. 5 is an enlarged perspective view of a main part in which a peripheral portion of a long hole of a plate fin used in the conventional heat exchanger is enlarged.

  As shown in FIG. 3, the conventional heat exchanger 21 disclosed in Patent Document 1 has a straight pipe portion 23 b and a substantially U-shaped bent pipe portion 23 a that are bent in a meandering manner in which the straight pipe portion 23 b is alternately continuous and is bent on one side. Has a flat processed refrigerant tube 23, a long plate fin 24a having a plurality of long holes 25 in the air flow direction for insertion from the flat processed bent tube portion 23a side, and a bent tube processed into a flat shape. The number of the long holes 25 in the air flow direction is shorter than that of the long plate fins 24a. The number of the long holes 25 in the air flow direction is shorter than that of the long plate fins 24a. The short plate fin 24b has a small amount.

  The long plate fins 24a are arranged in such a manner that one side of the long plate fins 24a faces the short plate fins 24b, or one side of the short plate fins 24b faces the long plate fins 24a, and the longest plate fin 24a has the longest hole 25 on the windward side. The refrigerant tubes 23 to be inserted are not inserted into the longest holes 25 on the windward side of the short plate fins 24b, and the long plate fins 24a and the long holes 25 of the short plate fins 24b arranged in parallel to each other with a space therebetween are arranged. A refrigerant tube 23 is inserted from the side of the bent pipe portion 23a that has been processed into a flat shape.

  The long hole 25 has a dog bone shape having a groove 31 located between the catch hole 26 facing in parallel and the catch holes 26 at both ends. The catch hole 26 has a substantially circular shape in which the outer peripheral surface of the straight pipe portion 23b of the refrigerant tube 23 is in close contact with the half-circumferential portion, and the width of the groove 31 is a thickness through which the refrigerant tube 23 of the bent pipe portion 23a processed into a flat shape passes. It has become.

When inserting the refrigerant tube 23 into the long plate fin 24a and the short plate fin 24b, the refrigerant tube 23 includes a plurality of long holes 25 in the air flow direction for insertion from the side of the bent pipe portion 23a processed into a flat shape. A long plate fin 24a having a plurality of long holes 25 in the air flow direction for insertion from the side of the bent pipe portion 23a processed into a flat shape, and having a dimension in the air flow direction shorter than that of the long plate fin 24a. The short plate fins 24b, in which the number of the long holes 25 in the air flow direction is smaller than that of the fins 24a, the one surface of the long plate fins 24a is opposed to the short plate fins 24b, or the one surface of the short plate fins 24b is the long plate fins 24a. The refrigerant tubes 23 inserted in the long holes 25 on the windward side of the long plate fins 24a so as to face each other A bent pipe portion 23a that is processed flat into the long holes 25 of the long plate fins 24a and the short plate fins 24b that are arranged in parallel to each other at an interval in an arrangement that is not inserted into the long holes 25 on the windward side of the tophine 24b. Insert.

  At this time, the refrigerant tube 23 processed into a flat shape penetrates the groove 31 portion located between the catch holes 26 at both ends of the long hole 25. After inserting the refrigerant tube 23 into the long holes 25 of the long plate fins 24a and the short plate fins 24b, liquid is put into the refrigerant tube 23, and the refrigerant tube 23, the long plate fins 24a, and the short plate fins 24b group are set by the liquid pressure. To fix tightly.

  As shown in FIGS. 4 and 5, the conventional heat exchanger 31 disclosed in Patent Document 2 includes a straight pipe portion and a substantially U-shaped curved pipe portion that are bent in a meandering manner in which the straight pipe portion and the substantially U-shaped curved pipe portion are alternately continuous. Is formed of a refrigerant tube 33 processed into a flat shape and a plurality of plate fins 34 arranged in parallel to each other at intervals, from the side of a bent pipe portion processed into a flat hole in a long hole 35 formed in the plate fin 34. A refrigerant tube 33 is inserted.

  The long hole 35 has a dog bone shape having catch holes 36 at both ends of the long hole straight portions 37a and 37b facing in parallel. The catch hole 36 has a substantially circular shape in which the outer peripheral surface of the refrigerant tube 33 in the straight pipe portion is in close contact with a half or more portion, and the width of the groove 41 between the long straight portions 37a and 37b is a curved pipe processed into a flat shape. It is narrower than the thickness of the refrigerant tube 33 of the part.

  When the refrigerant tube 33 is inserted into the long hole 35 of the plate fin 34, the refrigerant tube 33 is inserted into the long hole 35 with a bent pipe portion processed flat. At this time, the refrigerant tube 33 of the bent pipe portion processed into a flat shape is long and the interval between the long hole straight portions 37a and 37b is substantially equal to the thickness of the refrigerant tube 33 of the bent pipe portion processed into a flat shape. The portions located between the catch holes 36 at both ends of 35 are plastically deformed and penetrated. After inserting the refrigerant tube 33 into the long hole 35 of the plate fin 34, the liquid is put into the refrigerant tube 33, and the refrigerant tube 33 and the plate fin 34 group are closely fixed by the liquid pressure.

JP 11-333539 A JP-A-4-86490

  However, with the configuration of the conventional heat exchanger 21 disclosed in Patent Document 1, there is a difference in performance between the leeward side and the leeward side with a small surface area, and there is a problem that frost tends to form on the leeward side with good performance and the ventilation is poor. It was. In addition, since the refrigerant tube 23 is inserted into the long hole 25, the catch hole 26 of the long hole 25 is a substantially circular shape in which the outer peripheral surface of the straight pipe portion 23b of the refrigerant tube 23 is in close contact with the half-circumferential portion. Is formed to have a thickness through which the refrigerant tube 23 of the bent tube portion 23a processed into a flat shape passes, and the heat exchange performance is inefficient due to a decrease in the surface area of the refrigerant plate. Moreover, the wind bypassed the groove 31 and the performance was degraded.

Further, in the configuration of the conventional heat exchanger 31 disclosed in Patent Document 2, the long hole 35 of the plate fin 34 has a groove 41 between the long hole straight portions 37a and 37b to increase the surface area in order to improve performance. Is provided narrower than the thickness of the refrigerant tube 33 of the bent tube portion 33a that has been flattened, so that the surface area can be increased and the performance is good, but the long tube straight portion 37a, 37b is plastically deformed to cause the elongated hole straight portions 37a and 37b to be raised by the width of the curved pipe portion. After the refrigerant tube 33 and the plate fin 34 group are firmly fixed, the gap between the elongated hole straight portions 37a and 37b is increased. The groove 41 becomes wider, and the wind during operation bypasses from the groove 41 of the long hole 35 located at the outer ends of the group of plate fins 34 of the heat exchanger 31 to make the performance inefficient.

  Further, since the long hole straight portions 37a and 37b remain plastically deformed, when the heat exchanger 31 is used in an evaporator (cooler), condensed water tends to accumulate around the long hole straight portions 37a and 37b. In addition, since the water drainage is worse, frost clumps are likely to occur during operation, and the frost clumps are difficult to melt during defrosting, so there are problems such as poor ventilation and defrost time, so the heat exchanger 31 is drained. There was a problem of designing in a good installation direction.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a heat exchanger for a cooler having high performance, high quality, and good productivity.

  In order to achieve the above object, a heat exchanger according to the present invention comprises a long tube fin and a long tube fin arranged in parallel to each other at intervals, and a refrigerant tube from the bent tube portion side processed flat into a long hole of the short plate fin. A heat exchanger for a cooler in which a long plate fin at least on the windward side of at least the long plate fin is located at both ends of the long hole, and the outer peripheral surface of the refrigerant tube in the straight pipe portion is in close contact with the half-circumferential portion or more. A straight circular shape that connects the catch holes at both ends at a position away from one line from the straight line that connects the centers of the catch holes at both ends by a dimension that is approximately half the thickness of the flat bent pipe part. The opposite side of the slit from a straight line that connects the centers of the catch holes at both ends by a dimension that is approximately half the thickness of the curved pipe part that is flattened in the portion that is located between the catch holes at both ends of the long hole. At a distance The thickness than other portions is to have a thin linear press marks in rate fin.

  Thereby, since the width | variety of the slit of a long hole can be made thin, the surface area of the windward side of a long plate fin can increase, and it becomes possible to raise the performance of a windward side. In addition, the performance on the windward side is improved, so that a large amount of frost can be attached to the windward, and the frost on the leeward side where the distance between the long plate fins and the short plate fins is narrow is reduced and the ventilation is not hindered. I can plan.

  The long slot on the windward side is located between the catch holes at both ends of the plate fin and between the slit and the press mark. It can be easily awakened with weak force.

  After the refrigerant tube is inserted into the long hole, the gap between the slit and the press mark between the catch holes at both ends of the long hole in the plate fin, which is cut and raised by inserting the refrigerant tube into the long hole of the plate fin. The portion located at is corrected so as to be substantially parallel to the other portions of the plate fin.

  Here, the correction is, for example, for correction with a width narrower than the interval between the refrigerant tubes of the two straight pipe portions that are in contact with the catch holes at both ends of the same long hole with a thickness smaller than the interval between the plate fins arranged in large numbers. This can be done by inserting the jig from the press mark side toward the slit side between the refrigerant tubes of the two straight pipe portions that are in close contact with the catch holes at both ends of the same long hole.

Due to the long hole, the plate surface of the long plate fin on the windward side becomes flat, so the ventilation resistance during operation is reduced, the ventilation is improved, and the heat exchange performance can be improved. Further, the long plate fins and the short plate fins on the windward side are stepped alternately, and the pitch interval between the long plate fins on the opening surface is wide, so that ventilation is ensured even if frost is clumped. Further, since the long holes are provided, the drainage of the condensed water is improved, the frost mass during operation can be reduced, and the defrost time can be shortened, thereby saving energy.

  Moreover, since the plate surface is flat, the heat exchanger is easy to design and easy to use regardless of the direction of ventilation. In addition, since the portion caused by the insertion of the refrigerant tube is corrected to the base position and the slit width of the long hole becomes narrow, the bypass of the wind passing through the slit of the long hole can be prevented and efficient performance Can be obtained.

  The heat exchanger of the present invention has high performance, high quality, high productivity, and energy saving.

The perspective view of the heat exchanger in Embodiment 1 of this invention Perspective view of long plate fins and short plate fins used in the heat exchanger of the same embodiment The perspective view of the conventional heat exchanger disclosed by patent document 1 The perspective view of the conventional heat exchanger disclosed by patent document 2 The principal part expansion perspective view which expanded the peripheral part of the long hole of the plate fin used for the conventional heat exchanger indicated by patent documents 2

  The first invention includes a refrigerant tube in which a straight pipe portion and a substantially U-shaped curved pipe portion are alternately bent in a meandering shape, and the curved pipe portion on one side is processed into a flat shape, and the flat processed portion A long plate fin having a plurality of long holes for insertion from the bent pipe side in the air flow direction, and a plurality of the long holes for insertion from the bent pipe side processed in the flat shape in the air flow direction And a short plate fin having a shorter dimension in the air flow direction than the long plate fin and a smaller number of the long holes in the air flow direction than the long plate fin, wherein one side of the long plate fin is the short plate fin. The refrigerant tube inserted into the long hole on the furthest wind side of the long plate fin is arranged in such a manner that it faces the plate fin or one side of the short plate fin faces the long plate fin. The long plate fins arranged in parallel to each other with a space therebetween, and the bent pipe portion processed into the flat shape in the long holes of the short plate fins, in an arrangement not inserted into the long holes on the windward side of the top fin A heat exchanger for a cooler in which the refrigerant tube is inserted from the side, wherein at least the longest hole on the windward side of the long plate fin is located at both ends of the long hole, and the refrigerant tube of the straight pipe portion From a straight line connecting the centers of the catch holes at both ends to a substantially half dimension of the thickness of the bent pipe portion processed into a flat shape, one side from the substantially circular catch hole in which the outer peripheral surface and a half or more part are in close contact with each other A thickness of the bent pipe portion that is formed into a straight slit that connects the catch holes at both ends at a distant position and is processed into a flat shape in a portion located between the catch holes at both ends of the long hole. A heat exchanger having a linear press mark having a thickness smaller than that of the other portion of the plate fin at a position away from the slit from a straight line connecting the centers of the catch holes at both ends by a substantially half dimension. .

  In the above configuration, the longest hole on the windward side of the long plate fin is processed into a flat shape with a substantially circular catch hole located at both ends of the long hole and in close contact with the outer peripheral surface of the refrigerant tube of the straight pipe part and more than half a circumference. It consists of a straight slit that connects the catch holes at both ends at a position away from the straight line connecting the centers of the catch holes at both ends by approximately half the thickness of the bent pipe portion. It is possible to increase the windward surface area and increase the windward performance.

In addition, the performance on the windward side is improved, so that a lot of frost can be attached to the windward, and the distance between the long plate fins and the short plate fins is narrow. .

  In addition, there are short plate fins that have a shorter dimension in the air flow direction than the long plate fins and a smaller number of long holes in the air flow direction than the long plate fins, and one side of the long plate fin faces the short plate fins, Alternatively, the short plate fins are arranged so that one side faces the long plate fins, and the refrigerant tube inserted into the longest hole on the windward side of the long plate fin is not inserted into the longest hole on the windward side of the short plate fin. Since the pitch between the long plate fins is wide because they are arranged in parallel with each other at intervals, the ventilation space is secured even when frost clumps are attached, so there is no performance degradation due to insufficient ventilation .

  In addition, increasing the surface area facilitates heat transfer during defrosting, shortening the defrosting time, and saving energy.

  The long hole on the windward side bends the raised part along the press mark, and the portion located between the slit and the press mark between the catch holes at both ends of the long hole in the plate fin is the other part of the plate fin. The part located between the slit and the press mark between the catch holes at both ends of the long hole in the long plate fin so as to be inclined compared with the part of It can be done with weaker power.

  Also, the cut and raised portion can be returned to the base so as to be parallel to the other portions of the plate fin with a weaker force than that without a press mark.

  Therefore, insertion of the refrigerant tube into the long hole of the plate fin can be performed with a weaker force than that without the press mark, and after inserting the refrigerant tube into the long hole of the plate fin, the refrigerant tube into the long hole of the plate fin The part located between the slit and the press mark between the catch holes at both ends of the long hole in the plate fin, which is cut and raised by the insertion of the plate, is corrected so as to be substantially parallel to the other part in the plate fin. However, it can be done with a weaker force than that without press marks.

  Here, the correction is, for example, for correction with a width narrower than the interval between the refrigerant tubes of the two straight pipe portions that are in contact with the catch holes at both ends of the same long hole with a thickness smaller than the interval between the plate fins arranged in large numbers. This can be done by inserting the jig from the press mark side toward the slit side between the refrigerant tubes of the two straight pipe portions that are in close contact with the catch holes at both ends of the same long hole.

  Thereby, since the plate | board surface of a long plate fin becomes flat in the heat exchanger using this long plate fin, the ventilation resistance at the time of a driving | operation reduces, ventilation can improve and it can improve heat exchange performance. In addition, the drainage of condensed water when used as an evaporator (cooler) is improved, frost clumps during operation can be reduced, and defrost time can be shortened, resulting in energy saving.

  Moreover, since the plate surface is flat, the heat exchanger is easy to design and easy to use regardless of the direction of ventilation. In addition, since the portion caused by the insertion of the refrigerant tube is corrected to the base position and the width of the slit of the long hole becomes narrow, the bypass of the wind passing through the slit of the long hole can be prevented and efficient performance Can be obtained.

  In addition, it is easy to cut and raise at the position of the press mark, and it is easy to return to the base even if it is bent, so resistance (friction) when inserting a refrigerant tube with a bent pipe processed flat into a long hole Since the resistance (friction) is small when the raised part is returned to the base using a straightening jig etc., there is almost no possibility of damaging the plate surface of the long plate fin and deteriorating the appearance quality, and productivity It is possible to obtain a heat exchanger excellent in appearance and quality in appearance.

(Embodiment 1)
FIG. 1 is a perspective view of a heat exchanger according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view of long plate fins and short plate fins used in the heat exchanger of the same embodiment.

  As shown in FIG. 1 to FIG. 2, the heat exchanger 1 of the present embodiment is bent in a meandering manner in which straight pipe portions 3b and substantially U-shaped curved pipe portions 3a are alternately arranged, and the curved pipe portion 3a on one side is bent. The flattened refrigerant tube 3, the long plate fin 4 a having a plurality of long holes 5 to be inserted from the flattened curved pipe portion 3 a side in the air flow direction, and the flat bent tube There are a plurality of long holes 5 for insertion from the side of the portion 3a in the air flow direction, the dimension in the air flow direction is shorter than the long plate fins 4a, and the long holes 5 in the air flow direction are longer than the long plate fins 4a. It consists of short plate fins 4b with a small number.

  The long plate fins 4a are arranged in such a manner that one side of the long plate fins 4a faces the short plate fins 4b or one side of the short plate fins 4b faces the long plate fins 4a. The refrigerant tubes 3 to be inserted are arranged so as not to be inserted into the longest holes 5 on the windward side of the short plate fins 4b, and in the long holes 5 of the long plate fins 4a and the short plate fins 4b arranged in parallel with each other at intervals. It is a heat exchanger for a cooler in which the refrigerant tube 3 is inserted from the bent pipe portion 3a processed into a flat shape.

  And at least the longest hole 5 on the windward side of the long plate fin 4a is located at both ends of the long hole 5, and the substantially circular catch hole 6 in which the outer peripheral surface of the refrigerant tube 3 of the straight pipe portion 3b is in close contact with the half or more portion. And a straight slit 11 that connects the catch holes 6 at both ends at a position away from one straight line from the straight line connecting the centers of the catch holes 6 at both ends by approximately half the thickness of the flat bent tube portion 3a. The slit 11 extends from a straight line connecting the centers of the catch holes 6 at both ends by a dimension approximately half the thickness of the curved pipe portion 3a that is flattened in the portion located between the catch holes 6 at both ends of the long hole 5. A linear press mark 10 having a thickness smaller than that of the other part of the long plate fin 4a is provided at a position on the opposite side of the long plate fin 4a.

  In addition, each slit 11 of the plurality of long holes 5 of the long plate fin 4a is formed in the same direction from a straight line that connects the centers of the catch holes 6 at both ends by a dimension that is approximately half the thickness of the bent tube portion 3a that has been flattened. It is in a position away from one side (left side in FIG. 2).

  And the part (cut-up part 12) located between the slit 11 and the press mark 10 between the catch holes 6 at both ends of the long hole 5 in the long plate fin 4a is substantially the same as the other part in the long plate fin 4a. It is parallel.

  About the heat exchanger 1 of this Embodiment comprised as mentioned above, a manufacturing method is demonstrated below.

  The refrigerant tubes 3 are arranged so that one side of the long plate fins 4a faces the short plate fins 4b, or one side of the short plate fins 4b faces the long plate fins 4a, and the longest holes on the windward side of the long plate fins 4a The long holes of the long plate fins 4a and the short plate fins 4b, which are arranged in parallel with each other at intervals, are arranged such that the refrigerant tube 3 inserted into the long plate 5 is not inserted into the longest hole 5 on the windward side of the short plate fins 4b. 5 and the refrigerant tube 3 is inserted from the side of the bent tube portion 3a flattened into the long hole 5 without cut and raised, and the slit 11 and the press mark between the catch holes 6 at both ends of the long hole 5 of the long plate fin 4a. A portion (cut-and-raised portion 12) located between 10 and 10 is cut and raised along the press mark 10 (through bending) and penetrated.

And after inserting the refrigerant | coolant tube 3 in the long hole 5 of the long plate fin 4a and the short plate fin 4b, and the long hole 5 without cut and raising, a liquid is put in the refrigerant | coolant tube 3, and it is a straight pipe | tube of the refrigerant | coolant tube 3 with the liquid pressure. By closely contacting the portion 3b and the catch hole 6 of the plate fin 4, the refrigerant tube 3, the long plate fin 4a, and the short plate fin 4b group are tightly fixed.

  Next, correction is made with a width narrower than the interval between the refrigerant tubes 3 of the two straight pipe portions 3b which are in contact with the catch holes 6 at both ends of the same elongated hole 5 with a thickness smaller than the interval between the long plate fins 4a arranged in large numbers. Insert a jig (not shown) from the press mark 10 side to the slit 11 side between the refrigerant tubes 3 of the two straight pipe portions 3b that are in close contact with the catch holes 6 at both ends of the same long hole 5. Thus, between the catch holes 6 at both ends of the long hole 5 in the long plate fin 4a, which is cut and raised by inserting the refrigerant tube 3 into the long hole 5 of the long plate fin 4a, between the slit 11 and the press mark 10 The position (the cut and raised portion 12) is corrected so as to be substantially parallel to the other portions of the long plate fin 4a.

  As described above, in the present embodiment, the linear slit 11 that connects the catch holes 6 at both ends of the long hole 5 on the windward side of the long plate fin 4a is approximately half the thickness of the curved pipe portion 3a that is processed into a flat shape. Is it possible to increase the windward surface area by increasing the windward surface area of the long plate fin 4a because it is provided at a position separated from the straight line connecting the centers of the catch holes 6 at both ends to the one side (left side in FIG. 2)? It becomes possible.

  Moreover, since the performance on the windward side is improved, a large amount of frost can be attached to the windward, and the frost on the leeward side where the interval between the long plate fins 4a and the short plate fins 4b is narrowed is reduced and ventilation is not hindered.

  On the opposite side of the slit 11 from a straight line connecting the centers of the catch holes 6 at both ends by a dimension approximately half the thickness of the curved pipe portion 3a processed flat in a portion located between the catch holes 6 at both ends of the long hole 5. Since the linear press mark 10 is provided at a position far away from the other part of the long plate fin 4a, the long plate fin 4a is bent along the press mark 10 and the long plate fin 4a The long plate is formed such that a portion (cut-raised portion 12) located between the slit 11 and the press mark 10 between the catch holes 6 at both ends of the long hole 5 is inclined as compared with the other portions of the long plate fin 4a. The part located between the slit 11 and the press mark 10 between the catch holes 6 at both ends of the long hole 5 in the fin 4a is used as the raised part 12 so that the press mark 10 is not present. It can be a weak force compared.

  In addition, it is possible to return the portion that becomes the (cut and raised portion 12) to the base so as to be parallel to the other portion of the long plate fin 4a with a weaker force than that without the press mark 10.

  Therefore, insertion of the refrigerant tube 3 into the long hole 5 of the plate fin 4 can be performed with a weaker force than that without the press mark 10, and after inserting the refrigerant tube 3 into the long hole 5 of the plate fin 4, the long plate A portion (cut) between the catch holes 6 at both ends of the long hole 5 in the plate fin 4 between the slit 11 and the press mark 10, which is cut and raised by inserting the refrigerant tube 3 into the long hole 5 of the fin 4 a. It is possible to correct the raised portion 12) so as to be substantially parallel to the other portions of the plate fin 4 with a weaker force than that without the press mark 10.

  Thereby, since the plate | board surface of the long plate fin 4a becomes flat in the heat exchanger 1 using this long plate fin 4a, the ventilation resistance at the time of an operation | movement reduces, ventilation can improve and it can improve heat exchange performance. . In addition, the drainage of condensed water when used as an evaporator (cooler) is improved, frost clumps during operation can be reduced, and defrost time can be shortened, resulting in energy saving.

In addition, since the plate surface is flat, the heat exchanger 1 is easy to design and easy to use regardless of the direction of ventilation. Further, since the portion caused by the insertion of the refrigerant tube 3 is corrected to the base position and the width of the slit 11 of the long hole 5 becomes narrow, the bypass of wind passing through the slit 11 of the long hole 5 can be prevented. Efficient performance can be obtained.

  In addition, since the (cut and raised 12) is easily bent at the position of the press mark 10 and is easily returned to the base even if it is bent, the refrigerant tube 3 of the bent tube portion 3a processed flat into the long hole 5 is inserted. Since the resistance (friction) is small and the resistance (friction) is small when the raised part (cut-raised part 12) is returned to the base using a correction jig or the like, the plate surface of the long plate fin 4a is damaged. Thus, there is almost no possibility of deteriorating the appearance quality, and it is possible to obtain the heat exchanger 1 that is excellent in productivity and excellent in appearance quality.

  In addition, each slit 11 of the plurality of long holes 5 of the long plate fin 4a is formed in the same direction from a straight line that connects the centers of the catch holes 6 at both ends by a dimension that is approximately half the thickness of the bent tube portion 3a that has been flattened. Since it is located away from one side (left side in Fig. 2), the insertion direction can be unified to insert the correction jig, so it does not take time and the structure of the correction jig is not complicated. Is good and low cost.

  The heat exchanger according to the present invention provides a high-performance and low-cost heat exchanger that has high performance and high quality, can reduce man-hours, is easy to design without restricting the direction of installation, has good productivity, and is low in cost. Therefore, the present invention can also be applied to freezing and refrigeration and air conditioning mainly using aluminum and for automobiles.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 3 Refrigerant tube 3a Curved pipe part 3b Straight pipe part 4a Long plate fin 4b Short plate fin 5 Long hole 6 Catch hole 10 Press mark 11 Slit 12 Cut and raised part

Claims (1)

A straight tube portion and a substantially U-shaped bent tube portion are alternately bent into a meandering shape, and one side of the bent tube portion is processed into a flat shape, and the flat tube processed from the bent tube portion side is inserted. The long plate fin having a plurality of long holes in the air flow direction and the long plate fin having a plurality of long holes in the air flow direction to be inserted from the bent pipe portion processed into the flat shape A short plate fin having a shorter dimension in the air flow direction than the long plate fin and having a smaller number of the long holes in the air flow direction than the long plate fin, and one side of the long plate fin is opposed to the short plate fin, or The short tube fins are arranged so that one side of the short plate fins faces the long plate fins, and the refrigerant tube inserted into the long hole on the windward side of the long plate fins is the short plate fins. The long plate fins arranged in parallel to each other with a gap in an arrangement not inserted into the long holes on the windward side and the bent pipe side processed into the flat holes in the long holes of the short plate fins A heat exchanger for a cooler in which the refrigerant tube is inserted,
At least the longest hole on the windward side of the long plate fin is located at both ends of the long hole, and has a substantially circular catch hole in which the outer peripheral surface of the refrigerant tube of the straight pipe part and a part of the semicircular or more are in close contact, It consists of a straight slit that connects the catch holes at both ends at a position away from one straight line from the straight line connecting the centers of the catch holes at both ends by a dimension that is approximately half the thickness of the bent pipe portion processed flat. ,
Opposite to the slit from a straight line that connects the centers of the catch holes at both ends by a dimension approximately half the thickness of the flattened bent tube portion in the portion located between the catch holes at both ends of the long hole A heat exchanger characterized by having a linear press mark having a thickness smaller than that of the other part of the plate fin at a position apart to the side.

Images