JP4985127B2 - Heat exchanger and manufacturing method thereof - Google Patents

Description

  The present invention relates to a heat exchanger used in a refrigeration cycle or the like and a manufacturing method thereof.

  Refrigerant leakage from heat exchangers used in refrigeration and air conditioning equipment loses the function of the refrigeration air conditioning equipment itself, so reducing refrigerant leakage from 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.

  In such a heat exchanger, the location where refrigerant leakage occurs is mainly the joint portion of the pipe, and from this point, a heat exchanger having no joint portion in which the refrigerant circuit is constituted by one continuous refrigerant tube is known. (See Patent Document 1).

  FIG. 10 is a perspective view of a conventional heat exchanger described in Patent Document 1. As shown in FIG.

  As shown in FIG. 10, the heat exchanger 51 includes a group of plate fins 52 provided with a plurality of refrigerant tube insertion long holes, and a single continuous bent portion in a meandering shape in which a straight pipe portion and a curved pipe portion are continuous. The refrigerant tube 53, the refrigerant tube insertion side plate 54 and the bent tube portion side plate 55 are provided with a plurality of refrigerant tube insertion slots 54a.

And when the heat exchanger 51 inserts the refrigerant | coolant tube 53, the curved tube part (curved part) 53a of the refrigerant | coolant tube 53 is inserted from the elongate hole 54a from the side plate 54 side of a refrigerant | coolant tube insertion side, and the refrigerant | coolant tube 53 is inserted. After passing through the side plate 54 on the refrigerant tube insertion side, the group of plate fins 52, and the side plate 55 on the bent tube side, the refrigerant tube 53, the side plate 54, the side plate 55, and the group of plate fins 52 are brought into close contact with each other by hydraulic pressure or the like. It is manufactured through a fixing step.
JP 11-333539 A

  However, when the conventional heat exchanger 51 inserts the refrigerant tube 53 into the side plate 54 provided with a plurality of refrigerant tube insertion slots 54a, first, the refrigerant tube 53 is inserted from the side plate 54 side on the refrigerant tube insertion side. After inserting the curved pipe part 53a, the curved pipe part 53a of the refrigerant tube 53 passes through the side plate 54 on the refrigerant tube insertion side, the group of plate fins 52, and the side plate 55 on the curved pipe part side, and then maintains that state. The manufacturing procedure is such that the refrigerant tube 53, the side plate 54 on the insertion side, the side plate 55 on the bent tube side, and the group of plate fins 52 are closely fixed.

  At this time, the straight tube portion of the refrigerant tube 53 is in a state of frictional contact with the refrigerant tube insertion long hole 54a provided in the side plate 54 on the refrigerant tube insertion side (insertion source) continuously from the insertion destination to the insertion source. Since the insertion is performed, the friction resistance particularly when the refrigerant tube 53 passes through the side plate 54 (insertion source) is large. As a result, the refrigerant tube 53 is inserted in the step of buckling, warping, bending, and the like. There was a problem that defects occurred, the manufacturing yield deteriorated, and the manufacturing cost increased.

  Further, in order to prevent the defective process of the refrigerant tube, if the hole for inserting the refrigerant tube of the side plate 54 on the refrigerant tube entrance / exit side is made a dimension that ensures a sufficient clearance with respect to the refrigerant tube 53, the insertion property of the refrigerant tube 53 is improved. Although the refrigerant tube insertion hole of the side plate 54 on the refrigerant tube insertion side has too much clearance with respect to the refrigerant tube 53, the side plate 54 on the refrigerant tube insertion side and the refrigerant tube 53 can be connected even after the expansion process. It was not fixed and had the subject that quality deteriorated.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a heat exchanger with a good manufacturing yield, low cost, and high quality.

  In order to solve the above-described conventional problems, a heat exchanger according to the present invention is a side plate that is located across a group of plate fins and that has a hole through which a bent tube portion of a refrigerant tube passes. A through-hole through which the bent tube portion of the refrigerant tube passes, and the through-hole, and a part of the refrigerant tube protrudes to the inside of the through-hole in the through state of the refrigerant tube and is in close contact with the outer wall surface of the refrigerant tube It is set as the structure which comprises the processing hole which provided the contact | adherence part to perform.

  In the heat exchanger manufacturing method according to the present invention, the through hole is provided at a position close to the through hole in the side plate that is located between the group of plate fins and provided with a hole through which the bent tube portion of the refrigerant tube passes. In the state where a processing hole extending substantially parallel to the major axis is provided, the refrigerant tube passes through the end plate, the plate fin, and the end plate, and is interposed between the processing hole and the through hole in the end plate. The part to be plastically deformed so as to protrude toward the through hole until part of the part comes into close contact with the tube wall of the refrigerant tube.

  As a result, the refrigerant tube of the heat exchanger can be firmly and firmly fixed to the end plate by plastic deformation of the processed hole in the through state of the end plate. It can be made larger than the dimension of the tube penetration structure (bent tube structure).

  As a result, when the heat exchanger is assembled, the frictional contact between the refrigerant tube and the through hole is suppressed, and the risk of occurrence of problems such as deformation and bending of the refrigerant tube is reduced. Also, the refrigerant tube and the end plate can be firmly fixed by the close contact between the peripheral edge and the refrigerant tube due to plastic deformation of the peripheral edge of the processing hole, the manufacturing yield is good, and the end plate due to poor adhesion between the end plate and the refrigerant tube. It is possible to suppress rattling and detachment and to manufacture a high-quality heat exchanger.

  The heat exchanger according to the present invention is a heat exchanger that has a good yield that suppresses the occurrence of defects such as damage, warpage, or breakage of the refrigerant tube in the manufacturing process of the heat exchanger, and reduces unnecessary costs. It can be.

  Further, the manufacturing method of the heat exchanger according to the present invention can fix the end plate to the refrigerant tube by plastically deforming the processed hole, so that the end plate has a backlash due to poor adhesion between the end plate and the refrigerant tube. Therefore, it is possible to suppress the disconnection and to manufacture a high-quality heat exchanger.

The invention according to claim 1 has a refrigerant tube bent in a meandering manner so that the straight pipe portion and the curved pipe portion are continuous, and a plurality of long holes through which the refrigerant tube passes, and is spaced from each other. A heat exchanger having a plurality of disposed plate fins and a plurality of holes through which the refrigerant tube passes, and having a pair of end plates disposed with the plate fins interposed therebetween, wherein at least one of the end plates is A through hole through which the bent tube portion bent of the refrigerant tube passes, and a part of the refrigerant tube protruding inward through the through hole in the through state of the refrigerant tube. The processing hole is provided with a contact hole that is in close contact with each other , and the processing hole is substantially the same as the length of the rectangular portion of the through hole and extends in a direction parallel to the long diameter of the through hole. One and said The Koana not provided at a position where the through hole is not interposed between the end plate periphery, the through hole between the end plate periphery is obtained provided only at a position interposed.

  By adopting such a configuration, the dimension of the through hole provided in the end plate can be set to a dimension in which a clearance is provided in the curved pipe part dimension of the refrigerant tube, and as a result, the through hole of the refrigerant tube at the time of assembly. A heat exchanger that suppresses damage, warpage, and the like due to frictional contact with the heat exchanger can be obtained, and a low-cost heat exchanger that requires less unnecessary cost can be obtained.

Further, the close contact between the end hole and the refrigerant tube can be strengthened by the close contact with the refrigerant tube at a part of the processing hole provided in the end plate. A high-quality heat exchanger with few defects can be obtained.
Further, by adopting such a configuration, the strength of the portion between the end plate and the through hole can be ensured, and in the case where a part of the processed hole is brought into close contact with the refrigerant tube, the deformation of the end plate, particularly in the peripheral portion Can be suppressed, and the deterioration of the quality of the heat exchanger can be suppressed.

  According to a second aspect of the present invention, in the first aspect of the present invention, the processing hole is provided in the vicinity of at least the outermost through hole in the end plate.

  By adopting such a configuration, the end plate and the refrigerant tube are in close contact on both the left and right sides, and even if stress such as bending acts on the peripheral edge of the end plate, the close contact between the processing hole and the refrigerant tube hardly occurs. The state can be maintained well.

The invention according to claim 3 is the invention according to any one of claims 1 to 2 , wherein the end plate includes a first through hole through which one bent pipe portion of the refrigerant tube passes, and the refrigerant. A first end plate having an end hole through which at least a start end or a terminal end of the tube passes, and a second end having a second through hole through which the other bent pipe portion located on the opposite side of the one bent pipe portion passes. Further, the first through hole and the second through hole are substantially similar to the projected surface shape in the penetrating direction of the curved pipe portion in the refrigerant tube, and have a large area substantially equal to the projected area. Is.

  By adopting such a configuration, it is possible to suppress frictional contact between the end plate and the refrigerant tube at the time of inserting the refrigerant tube, and to obtain a refrigerant tube penetrating structure with very little damage or warpage, thereby improving the quality of the heat exchanger. Can do.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the first through hole provided in the first end plate includes a rectangular portion and a semicircular portion having the same diameter as the short side of the rectangular portion. The semicircular portion has an elongated hole shape continuous to each short side at both ends of the rectangular portion, and the second through hole provided in the second end plate has a rectangular portion and an outer diameter of the refrigerant tube. The circular portion has a larger-diameter circular portion, and the circular portion has a shape that is continuous with each short side on both sides of the rectangular portion.

  By adopting such a configuration, the shape of the first and second through holes can be approximated to the through shape formed by the refrigerant tube, and as a result, the contact area between the refrigerant tube and the first and second end plates. Can be ensured as much as possible, and the close contact between the refrigerant tube and each end plate after the expansion of the refrigerant tube can be maintained satisfactorily. As a result, it is possible to improve the close contact between a part of the processed hole and the refrigerant tube, and it is possible to more reliably suppress the problems such as rattling and detachment of the end plate.

The invention according to claim 5 is the invention according to claim 3 or 4 , wherein at least one material of the first end plate and the second end plate is a steel plate.

  Thus, the material cost of the heat exchanger can be reduced by using an inexpensive steel plate.

The invention according to claim 6 is the invention according to claim 5 , wherein the through hole of the end plate formed by the steel plate is formed by press molding, and the burr around the periphery of the through hole formed at the time of the processing is formed. The end plates are arranged such that the extending direction is a direction through which the bent pipe portion passes.

  This makes it possible to reduce the risk that the burr damages the refrigerant tube when penetrating the end plate of the refrigerant tube, and can reduce damage to the refrigerant tube even when the refrigerant tube is inserted by an automation device. It is also possible to suppress damage and reduce the quality of the heat exchanger.

The invention according to claim 7 has a refrigerant tube bent in a meandering manner so that the straight pipe portion and the curved pipe portion are continuous, and a plurality of long holes through which the refrigerant tube passes, and is spaced from each other. A plurality of plate fins arranged and a plurality of holes through which the refrigerant tube passes, and a pair of end plates arranged with the plate fin interposed therebetween, and the refrigerant tube is inserted from one direction of the plate fin A method of manufacturing a heat exchanger, wherein the end plate includes a through hole through which the bent tube portion of the refrigerant tube is bent, and the through hole is provided in at least one of the end plates. A machining hole extending substantially parallel to the long diameter of the through hole at a position close to the through hole, the machining hole being substantially the same as the length of the rectangular portion of the through hole, and the long diameter of the through hole One that extends parallel to the And then, the machined hole, not provided at a position where the through hole is not interposed between the end plate periphery, is provided only at a position where the through hole is interposed between the end plate periphery, the refrigerant tube In the state where the end plate, the plate fin, and the end plate are penetrated, a portion interposed between the processing hole and the through hole in the end plate is inserted into the through hole until a part thereof is in close contact with the tube wall of the refrigerant tube. It is a manufacturing method of a heat exchanger provided with the process of carrying out plastic deformation only from the opposite edge side in an end plate so that it may protrude to the side, and the process of expanding the refrigerant tube .

  With this method, in the heat exchanger assembly state, the close contact state between the refrigerant tube and the end plate can be strengthened, and deterioration in quality due to rattling or detachment of the end plate can be suppressed. . In particular, when the refrigerant tube is expanded after plastic deformation of the processed hole, the adhesion can be further strengthened.

  Further, by making the size of the through hole provided in the end plate slightly larger than the bent tube portion size of the refrigerant tube, it is possible to suppress the frictional contact with the end plate in the refrigerant tube penetration process. As a result, the manufacturing method has a good yield with little damage and warpage of the refrigerant tube.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a perspective view of a heat exchanger according to Embodiment 1 of the present invention. FIG. 2 is a plan view from the first end plate side of the heat exchanger in the first embodiment. FIG. 3 is a plan view before assembly of a first end plate constituting the heat exchanger of the first embodiment. FIG. 4 is a plan view of a second end plate constituting the heat exchanger of the first embodiment. FIG. 5 is a plan view of plate fins constituting the heat exchanger of the first embodiment. FIG. 6 is a local cross-sectional view showing a through state of the refrigerant tube of the heat exchanger according to the first embodiment. FIG. 7 is a plan view of a first through hole provided in the first end plate of the heat exchanger in the first embodiment. FIG. 8 is a plan view of a second through hole provided in the second end plate of the heat exchanger according to the first embodiment. FIG. 9 is a process diagram before the refrigerant tube is inserted into the plate fin group in the manufacturing method of the heat exchanger according to the first embodiment.

  In FIG. 1, a heat exchanger 1 includes a refrigerant tube 3 formed by bending a straight pipe portion 3a and a curved pipe portion 3b in a meandering manner so that a plurality of columns A and B are arranged in a row and a row B. A group of plate fins (hereinafter referred to as a plate fin group) 2 in which a plurality of long holes 2a (FIG. 5) for tube insertion are provided, arranged at intervals, and into which the refrigerant tube 3 is inserted, and a plate fin group 2 The first end plate 4 and the second end plate 5 are disposed at both ends of the plate fin group 2 so as to sandwich the first end plate 4 and the second end plate 5 which are inserted so as to be in close contact with the refrigerant tube 3. Here, the first end plate 4 is the insertion side of the refrigerant tube 3, and the second end plate 5 is the penetration side of the refrigerant tube 3.

  The refrigerant tube 3 is generally made of a material such as copper or aluminum, the plate fin group 2 is made of aluminum, and the first and second end plates 4 and 5 are made of steel. It has been.

  As shown in FIG. 3, the first end plate 4 has a first through hole 6 having a long hole shape through which the curved pipe portions 3 b and 3 </ b> A of the refrigerant tube 3 pass, and the first through hole 6 in the vicinity of the first through hole 6. A rectangular processing hole 7 extending in a direction parallel to the major axis of the hole 6 is provided. The first through hole 6 and the processed hole 7 are formed by stamping by press molding.

  In the through hole located diagonally in the first through hole 6, the start end 3 c and the end end 3 d of the refrigerant tube 3 pass through in the assembled state of the heat exchanger 1. The through hole 6 is formed of a rectangular portion 6a and a semicircular portion 6b having the same diameter as the short side of the rectangular portion 6a, and the semicircular portion 6b is continuous with the short side of the rectangular portion 6a, thereby forming a long hole shape. Is formed.

  The curved pipe portion 3b penetrating through the first through hole 6 is different from the curved pipe portion 3A described later in that the straight pipe portion 3a of the refrigerant tube 3 is simply curved to a predetermined diameter. 6 is formed in a long hole shape having a width close to the diameter of the refrigerant tube 3. Specifically, when the clearance is too large in the penetration of the refrigerant tube 3, the adhesiveness with the refrigerant tube 3 cannot be ensured, and therefore the dimension is set such that the frictional contact is reduced or almost absent.

  Further, the processing hole 7 is provided so that the outermost first through hole 6 is located between the peripheral edge of the first end plate 4. In the first embodiment, each of the left and right sides is provided. It is provided corresponding to the first through holes 6 that are vertically arranged in two horizontal rows. The formation of the processed hole 7 is arbitrarily set according to the size of the heat exchanger 1 or the number of columns and rows of the refrigerant tubes 3. It is possible to form a processed hole corresponding only to the through hole.

  In the assembled state of the heat exchanger 1, the processed hole 7 is a part (hereinafter referred to as a close contact portion) 7 a sandwiched between the rectangular portion 6 a of the first through hole 6 and the processed hole 7. It is plastically deformed so as to be in close contact with the refrigerant tube 3. Therefore, as shown in FIG. 2, the machining hole 7 is deformed into a shape in which the hypotenuse is curved based on a trapezoid.

  Further, as shown in FIG. 4, the second end plate 5 is provided with a second through hole 8 through which the bent tube portion 3A of the refrigerant tube 3 passes by press molding.

  The second through-hole 8 is formed by a rectangular portion 8a and a circular portion 8b having a larger diameter than the short side of the rectangular portion 8a. Both ends in the direction are formed in a bulging shape. The circular portion 8 b is set to be slightly larger than the diameter of the refrigerant tube 3.

  The reason why the second through hole 8 is shaped is that when the bent tube portion 3A of the refrigerant tube 3 passes through the plate fin group 2 and the second end plate 5, the bent tube is smoothened. This is because the arc portion of the portion 3A is processed slightly flat. The reason why the second through hole 8 is set to be slightly larger than the diameter of the refrigerant tube 3 is to allow the refrigerant tube 3 to pass through relatively smoothly.

  Therefore, in a state where the refrigerant tube 3 penetrates the second end plate 5, the circular portion 8b of the second through hole 8 and the refrigerant tube 3 are substantially in close contact with each other.

  Here, since the first through hole 6 and the second through hole 8 are formed by press molding as described above, burrs extending in the punching direction in the punching direction remain on the periphery. Is. This will be described with reference numerals 9a and 9b attached to the burrs in FIGS.

  The plate fin group (plate fin) 2 interposed between the first end plate 4 and the second end plate 5 has a second through hole provided in the second end plate 5 as shown in FIG. A long hole 2 a having a shape similar to that of 8 is provided by press molding, and is slightly larger than the second through hole 8. A collar portion 2b (FIG. 6) is provided around the long hole 2a for good regulation of the interval between the fins and good heat conduction with the refrigerant tube 3.

  Next, a method for assembling the heat exchanger 1 configured as described above will be described with reference to FIGS. 6 and 9.

  First, as shown in FIG. 9, the first end plate 4 and the second end plate 5 are respectively provided at the both ends in the stacking direction of the plate fin group 2 in the stacked state. It arrange | positions so that the two through-holes 8 may correspond. At this time, the first end plate 4 and the second end plate 5 are formed by extending the burrs 9 a and 9 b remaining on the periphery of the first through hole 6 and the second through hole 8 and the collar portion 2 b provided in the plate fin group 2. It arrange | positions so that an output direction may become the same direction, respectively.

  Next, a refrigerant tube 3 in which straight pipes are bent in a meandering manner so that a plurality of straight pipes are arranged in a column A and a row B is provided on the first end plate 4 in the direction of the arrow as shown in FIG. The insertion is continued into the first through hole 6, and the insertion is continued through the elongated hole 2a provided in the plate fin group 2 and the second through hole 8 provided in the second end plate 5 in order, and the bent tube portion 3A is inserted. The state shown in FIG. 6 is formed by projecting from the second end plate 5.

  Here, since the burrs 9a and 9b remaining in the first through hole 6 and the second through hole 8 extend in the same direction and in the same direction as the insertion direction of the curved pipe portion 3A, the refrigerant tube 3 is inserted. In the process, the burr 9a, 9b is prevented from biting into the surface of the refrigerant tube 3.

  Then, in the state where the refrigerant tube 3 is inserted at a predetermined position as described above, the contact portion 7a sandwiched between the processed hole 7 provided in the first end plate 4 and the first through hole 6 is replaced with the first through hole 6. Plastically deform so that it protrudes to the side. The degree of protrusion is preferably such that it contacts the straight pipe portion 3a of the refrigerant tube 3. The plastic deformation of the contact portion 7a is performed, for example, by sandwiching the periphery of the first end plate 4 and the side of the processing hole 7 near the first through hole 6 and applying a force in this state to form the plastic deformation as described above. It can be performed with a jig or an equipment equipped with a mechanism.

  Then, by flowing (press-fitting) a liquid such as water or oil pressurized to a high pressure into the refrigerant tube 3, the refrigerant tube 3 is expanded by the liquid pressure, and the refrigerant tube 3 and the plate fin group 2, The first end plate 4 and the second end plate 5 are fixed in close contact with each other. By completing this process, the assembly of the heat exchanger 1 is completed.

  In the heat exchanger 1 assembled as described above, the shape and area of the first through-hole 6 and the second through-hole 8 provided in the first and second end plates 4 and 5 are the penetration direction of the refrigerant tube 3. Since the projection surface shape is similar to or substantially similar to the projected surface shape and the area is set to be slightly large, the frictional contact (rubbing, catching, etc.) between the first and second end plates 4 and 5 and the refrigerant tube 3 occurs. Less configuration.

  In particular, since the first end plate 4 is configured to plastically deform the contact portion 7a of the processing hole 7 after the refrigerant tube 3 has passed through the first through hole 6 and to fix it to the refrigerant tube 3, The dimension of the one through hole 6 can be a dimension having a sufficient clearance with respect to the refrigerant tube 3.

  Therefore, the friction between the first end plate 4 and the refrigerant tube 3 during assembly can be reduced as much as possible. As a result, damage such as buckling in the refrigerant tube 3 can be reduced, and heat exchange hardly causes deformation. A container 1 can be obtained. Further, for example, deformation of the plate fin group 2 due to the above-described deformation can suppress adverse effects such as an increase in ventilation resistance and a decrease in performance of the heat exchanger 1.

  Furthermore, as described above, since the assembly that suppresses damage (buckling, warping, bending, etc.) of the refrigerant tube 3 and the like is possible, the yield is good, the productivity can be increased, and the manufacturing cost can be reduced. It will be.

  Further, by appropriately setting the lengths of the start end 3c and the end end 3d of the refrigerant tube 3, it is not necessary to braze a pipe (short dimension) that facilitates connection to the fluid circuit side, which is conventionally called a lead pipe. It is possible to suppress deterioration in quality due to improper attachment.

  Further, since the processing hole 7 is provided in the vicinity of the first through hole 6 located on the outermost side of the first end plate 4, the processing hole 7 is in close contact with the refrigerant tube 3 on both the left and right sides of the first end plate 4. As a result, even if stress such as bending acts on the peripheral edge of the first end plate 4, it is difficult to loosen the close contact between the processing hole 7 and the refrigerant tube 3, and an effective close fixing structure is obtained. The close contact state can be maintained well.

  In particular, the first end plate 4 and the refrigerant tube 3 are fixed by first plastically deforming the contact portion 7a of the processing hole 7 by caulking or the like, and once the first end plate 4 and the refrigerant tube 3 are secured. Since it is the structure which expands the refrigerant | coolant tube 3, a strong fixing structure is obtained, and the firm fixing structure without the rattling of the 1st end plate 4 and a removal | exfoliation is obtained.

  Further, the processing holes 7 may be arranged adjacent to the long sides of the rectangular portions 6a of all the first through holes 6, but for example, only in the row having the entrance / exit of the refrigerant tubes 3 in order to shorten the manufacturing process. As long as the refrigerant tube 3 and the first end plate 4 can be fixed, such as being installed, other appropriate arrangements may be employed.

  Furthermore, since the processing hole 7 is provided at a position where the first through hole 6 is interposed between the peripheral edge of the first end plate 4, the strength of the portion between the first end plate 4 and the first through hole 6 is increased. In the so-called plastic deformation process in which the close contact portion 7a of the processed hole 7 is in close contact with the refrigerant tube 3, the deformation of the first end plate 4 particularly in the peripheral portion is suppressed, and the quality of the heat exchanger 1 is improved. It is possible to suppress damage.

  In addition, the first through hole 6 and the second through hole 8 are substantially similar to the projection surface shape in the penetration direction of the curved pipe portions 3b and 3A in the refrigerant tube 3 and have a large area substantially equal to the projection area. The frictional contact between the first and second end plates 4 and 5 and the refrigerant tube 3 at the time of inserting the refrigerant tube 3 can be suppressed, and a through structure of the refrigerant tube 3 with very little damage or warpage can be obtained. The quality of the heat exchanger 1 can be improved.

  Further, the first through hole 6 provided in the first end plate 4 is formed in a long hole shape, and the second through hole 8 provided in the second end plate 5 is larger in diameter than the rectangular portion 8 a and the outer diameter of the refrigerant tube 3. Therefore, the shape of each of the first and second through holes 6 and 8 can be approximated to the through shape formed by the refrigerant tube 3. Therefore, the contact area between the refrigerant tube and the first and second end plates 4 and 5 can be ensured as much as possible, and the refrigerant tube and the end plates 4 and 5 are in close contact after the expansion of the refrigerant tube 3. It can be maintained well. As a result, the close contact between the part of the processed hole 7 and the refrigerant tube 3 can be made better, and the first end plate 4 can be more reliably suppressed from rattling and disconnection. .

  Moreover, since the steel plate is used for the 1st end plate 4 and the 2nd end plate 5, the material cost of the heat exchanger 1 can be suppressed, and the cost reduction of the heat exchanger 1 is attained. .

  Furthermore, the extending direction of the burrs 9a and 9b at the periphery of the through hole formed at the time of press molding of the first and second through holes 6 and 8 provided in the first and second end plates 4 and 5, By arranging the end plate so that the curved pipe portion penetrates, the risk of burrs 9a and 9b damaging the refrigerant tube 3 when the refrigerant tube 3 passes through the end plate can be reduced, and the heat exchanger is less damaged. Can be configured.

  Further, even when the refrigerant tubes 3 having a large number of rows and stages are provided, the heat exchanger 1 can be manufactured relatively easily.

  Further, by chamfering the connecting portion between the rectangular portion 8a and the circular portion 8b of the second through hole 8 provided in the second end plate 5, the corners of the connecting portion at the rectangular portion 8a and the circular portion 8b are sharpened. And the damage to the refrigerant tube 3 which is a concern when the refrigerant tube 3 passes through the through hole 8 of the second end plate 5 can be further reduced.

  Moreover, a burring can also be provided in the passage part of the refrigerant tube 3 in the first through hole 6 and the second through hole 8. Thereby, the insertion of the refrigerant tube 3 can be improved, and an effect of improving the fixing state of the refrigerant tube 3 and the first and second end plates 4 and 5 can be obtained.

  Furthermore, the diameter (width dimension) of the long hole 2 a for inserting the refrigerant tube provided in the plate fin group 2 is larger than the diameter of the semicircular portion 6 b of the first through hole 6 provided in the first end plate 4, and By making the diameter (width dimension) of the semicircular portion 6b of one through-hole 6 larger than the circular portion 8b of the second through-hole 8 provided in the second end plate 5, the assembly is easy and the refrigerant after assembly. The fixed state of the tube 3 and the first and second end plates 4 and 5 can be improved.

  The first through hole 6 provided in the first end plate 4 and the second through hole 8 provided in the second end plate 5 are bent pipes when the refrigerant tube 3 is viewed from the bent pipe portion 3b (3A) side. Since the position is set so as to be the same arrangement as the part 3b (3A), the first end plate 4 and the second end plate 5 can have the same specification, and standardization of parts can also be achieved. it can.

  In such a case, both the first end plate 4 and the second end plate 5 require a plastic deformation step of the close contact portion 7a adjacent to the processing hole 7.

  The heat exchanger according to the present invention is a heat exchanger with reduced manufacturing cost, and the manufacturing method is a manufacturing method with a high yield that reduces the defective process of the refrigerant tube, and can reduce the manufacturing cost. In addition to heat exchangers that use fluid as a refrigerant, such as refrigerators and vending machines, the present invention can be widely applied to the industrial equipment field that includes a heat exchanger that uses liquid such as water as a fluid, such as a radiator.

The perspective view of the heat exchanger in Embodiment 1 of this invention The top view from the 1st end plate side of the heat exchanger in the embodiment The top view before the assembly of the 1st end plate which comprises the heat exchanger in the embodiment The top view of the 2nd end plate which comprises the heat exchanger of the embodiment The top view of the plate fin which comprises the heat exchanger of the embodiment Local sectional drawing which shows the penetration state of the refrigerant | coolant tube of the heat exchanger in the embodiment The top view of the 1st through-hole part provided in the 1st end plate of the heat exchanger in the embodiment The top view of the 2nd through-hole part provided in the 2nd end plate of the heat exchanger in the embodiment Process drawing before inserting refrigerant tubes into plate fin group in manufacturing method of heat exchanger in same embodiment The perspective view of the heat exchanger in a prior art example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Plate fin 2a Elongated hole 3 Refrigerant tube 3A Curved pipe part 3b Curved pipe part 4 1st end plate 5 2nd end plate 6 1st through-hole 6a Rectangular part 6b Semicircle part 7 Processed hole 7a Contact | adherence part 8 Second through hole 8a Rectangular part 8b Circular part 9a Burr 9b Burr

Claims (7)

A refrigerant tube bent in a meandering manner so that the straight pipe portion and the curved pipe portion are continuous, and a plurality of plate fins having a plurality of long holes through which the refrigerant tube passes, and arranged at intervals from each other; A heat exchanger having a plurality of holes through which the refrigerant tube passes and having a pair of end plates arranged with the plate fins sandwiched therebetween, wherein at least one of the end plates is bent in the refrigerant tube A process provided with a through-hole through which the curved pipe portion passes, and a close-contact portion that is provided side by side with the through-hole and that partially protrudes into the through-hole in the penetrating state of the refrigerant tube and closely contacts the outer wall surface of the refrigerant tube It is configured to include a hole, and the processing hole is substantially the same as the length of the rectangular portion of the through hole, and extends in a direction parallel to the long diameter of the through hole. The end plate periphery and The not provided at a position where the through hole is not interposed, the heat exchanger wherein the through hole is provided only at a position interposed between said end plate perimeter between.   The heat exchanger according to claim 1, wherein the processing hole is provided in the vicinity of at least the outermost through hole in the end plate. The end plate includes a first through hole through which one bent pipe portion of the refrigerant tube penetrates, a first end plate having an end hole through which at least a starting end or a terminal end of the refrigerant tube passes, and the one bent portion. A second end plate having a second through hole through which the other bent pipe portion located on the opposite side of the pipe portion passes, and further, the first through hole and the second through hole are bent pipes in the refrigerant tube. The heat exchanger according to any one of claims 1 to 2 , wherein the area is substantially similar to the projected surface shape in the penetrating direction of the portion and has a large area substantially equal to the projected area. The first through hole provided in the first end plate has a rectangular part and a semicircular part having the same diameter as the short side of the rectangular part, and the semicircular part has short sides at both ends of the rectangular part. The second through hole provided in the second end plate has a rectangular portion and a circular portion having a diameter larger than the outer diameter of the refrigerant tube, and the circular portion is the rectangular portion. The heat exchanger according to claim 3 , wherein the heat exchanger has a shape that is continuous with each short side on both sides. The heat exchanger according to claim 3 or 4 , wherein a material of at least one of the first end plate and the second end plate is a steel plate. The through hole of the end plate formed by the steel plate is formed by press molding, and the extending direction of the burr at the periphery of the through hole formed at the time of processing is the direction through which the bent pipe portion passes. The heat exchanger according to claim 5 , wherein an end plate is arranged. A refrigerant tube bent in a meandering manner so that the straight pipe portion and the curved pipe portion are continuous, and a plurality of plate fins having a plurality of long holes through which the refrigerant tube passes, and arranged at intervals from each other; A method of manufacturing a heat exchanger, comprising a plurality of holes through which the refrigerant tube passes, having a pair of end plates arranged with the plate fin interposed therebetween, and allowing the refrigerant tube to be inserted from one direction of the plate fin. The end plate includes a through hole through which the bent pipe portion of the refrigerant tube passes, and at least one of the end plates has a long diameter at a position close to the through hole. The processing hole is substantially the same as the length of the rectangular portion of the through hole and extends in a direction parallel to the long diameter of the through hole. Suppose that the processed hole Not provided at a position where the through hole is not interposed between the end plate periphery, is provided only at a position where the through hole is interposed between the end plate periphery, the refrigerant tube wherein the end plate, the plate fins, the end while passing through the plate, a portion interposed between the through hole and the machining holes in the end plate, the end plate so as to protrude into the through-hole side to partially close contact with the tube wall of the refrigerant tube The manufacturing method of the heat exchanger provided with the process of plastically deforming only from the opposite peripheral side in and the process of expanding the said refrigerant | coolant tube .

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