JP2000266485A - Heat exchanger and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the length of the main body of a heat exchanger and reduce the diameter of tubes and, in addition, to improve the productivity of the heat exchanger. SOLUTION: The paired straight tube sections 2a of a tube 2 and a bend section 2b which connects one ends of the tube sections 2a to each other are inserted into the long hole 1a of each fin 1 by inserting a wire-like traction tool 3 into the long hole 1a and, at the same time, connecting the connecting section 3b of the tool 3 to the bend tube section 2b of the tube 2 positioned on one end side of the fin 1 in the arranging direction of the fins 1 and drawing the wire section 3a of the tool 3 toward the other end side of the fin 1 in the arranging direction. Therefore, the tube 2 is not bent and can be made longer in length or thinner in diameter at the time of inserting the tube 2 into the fin 1. In addition, since the fins 1 are formed of pulse-like members having integrally and continuously formed sections faced to each other at intervals, it is not required to arrange many plate-like fins one by one before inserting the tube 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a heat exchanger used for an evaporator of a refrigerator or a freezer / refrigerated showcase.

[0002]

2. Description of the Related Art Conventionally, as this type of heat exchanger, for example, as described in Japanese Patent Application Laid-Open No. 5-26591, a large number of plate-like fins arranged in parallel at intervals are known. There is known a refrigerant flow tube having a straight tube portion and a curved tube portion continuously, and the tube and each fin are joined such that the straight tube portion of the tube is orthogonal to each fin.

When manufacturing this heat exchanger, a pair of straight pipes of a tube is inserted into a long hole provided in each fin, and each straight pipe of the tube is joined to both longitudinal ends of the long hole. Like that. In this case, a long insertion jig having a thickness smaller than the width of the long hole of the fin is locked inside the curved tube portion of the tube, and the insertion jig is inserted into the long hole of each fin held in parallel in advance. The tube is inserted into each fin while pressing.

[0004]

By the way, when manufacturing a long heat exchanger for use in large refrigeration equipment such as a store showcase, a straight tube of the heat exchanger tube is required. The part needs to be formed long. Also,
Propane, which has a high internal pressure (can be made small) in the future, is considered to be a promising refrigerant for use in this type of refrigeration / refrigeration equipment. Not only is the internal pressure increased, but also the material cost is reduced and the heat exchanger body becomes smaller. In order to achieve higher performance and higher performance, it is necessary to reduce the diameter of the tube.

However, in the method for manufacturing the heat exchanger, the thickness of the insertion jig is smaller than the width of the long hole of the fin, so that the length of the jig is relatively longer than the thickness. Then, the amount of flexure of the jig itself becomes large, and there is a problem in its manufacture that it is not possible to sufficiently cope with the increase in the length of the heat exchanger body and the reduction in the diameter of the tube as described above. Further, in the conventional manufacturing process, before inserting the tube into each fin, the fins must be arranged at an interval from each other, and in this case, a large number of grooves for holding each fin are formed. Using the provided jig, one fin is inserted into each groove of the jig. For this reason, there is also a problem that a great deal of labor and time are required for the work of arranging the fins, and productivity is remarkably reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to increase the length of the heat exchanger body and the diameter of the tube, and to improve the productivity. It is an object of the present invention to provide a possible method of manufacturing a heat exchanger.

[0007]

In order to achieve the above object, according to the present invention, a heat transfer fin and a refrigerant flow tube having a straight pipe section and a curved pipe section continuously are provided. In a method for manufacturing a heat exchanger comprising inserting a pair of straight pipe portions of a tube into both ends of a long hole provided in a fin in a longitudinal direction, the fins formed in a pulse or meandering shape are spaced apart from each other. By providing the elongated holes in opposing portions, respectively, and pulling the curved tube portion of the tube from one end of the fin to the other end through the elongated holes of the fin, the tube is inserted into each elongated hole of the fin. I have to. This prevents the tube from bending when inserted into the fin. In addition, since the fins continuously and integrally have opposing portions at intervals, it is not necessary to arrange a large number of flat fins one by one before inserting the tube.

According to a second aspect of the present invention, in the method for manufacturing a heat exchanger according to the first aspect, a wire-like traction tool having one end connected to a curved tube portion of a tube is inserted into each long hole of the fin,
The tube is inserted into each long hole of the fin by pulling the other end of the traction tool from one end of the fin in the arrangement direction to the other end. Thus, in addition to the operation of the first aspect, the tube is pulled using the wire-like pulling tool having one end connected to the tube, so that the tube can be easily and reliably pulled. According to the third aspect of the present invention, the heat transfer fin and the refrigerant flow tube having the straight pipe portion and the curved pipe portion continuously are provided, and a pair of the tubes is provided at both ends in the longitudinal direction of the long hole provided in the fin. In a heat exchanger in which a straight pipe portion is inserted, the fins are formed in a pulsed or meandering shape, and the fins are provided with respective slots at opposing portions at an interval from each other, and a tube in each of the slots is provided. Except for both ends for insertion, a wide portion is provided in which the width of the long hole is partially enlarged in a direction orthogonal to the longitudinal direction. Thereby, it is possible to insert the tube into each long hole of the fin using an insertion jig in which a portion corresponding to the wide portion of the long hole is partially projected in the thickness direction. Since the has a portion that partially protrudes in the thickness direction, the rigidity in the thickness direction increases, and the amount of deflection decreases. In addition, since the fins continuously and integrally have opposing portions at intervals, it is not necessary to arrange a large number of flat fins one by one before inserting the tube.

According to a fourth aspect of the present invention, there is provided a heat transfer fin,
A heat exchanger comprising a refrigerant flow tube having a continuous straight tube portion and a curved tube portion, wherein a pair of straight tube portions of the tube are inserted at both longitudinal ends of a long hole provided in the fin. The fins are formed in a pulsed or meandering shape, and the fins are provided with the slots at opposing portions at an interval from each other. A bent portion is provided for partially expanding the width of the long hole in a direction orthogonal to the longitudinal direction by bending. Thus, using an insertion jig in which a portion corresponding to the bent portion of the long hole is partially protruded in the thickness direction, and bending the bent portion at the protruding portion of the insertion jig to connect the tube to each of the fins The insertion jig can be inserted into the elongated hole, and the insertion jig has a portion that protrudes partially in the thickness direction, so that the rigidity in the thickness direction is increased and the amount of deflection is reduced. In this case, the fin has a larger heat transfer area by the amount of the bent portion. In addition, since the fins continuously and integrally have opposing portions at intervals, it is not necessary to arrange a large number of flat fins one by one before inserting the tube.

According to a fifth aspect of the present invention, in the heat exchanger according to the fourth aspect, the fin is provided with at least one notch extending in a width direction of the long hole from a portion excluding both ends of the long hole for inserting the tube, A fold of the bent portion is formed from one end of the cut as a base point. Thereby, Claim 4
In addition to the action described above, the bent portion is reliably bent by the insertion of the tube due to the cuts and folds.

According to a sixth aspect of the present invention, in the heat exchanger according to the fifth aspect, the fold of the bent portion is formed by grooves provided on both surfaces of the fin. Thereby, in addition to the operation of the fifth aspect, since the bent portion is bent in any direction in the thickness direction of the fin, it is not necessary to specify the direction of the fin with respect to the insertion direction of the tube.

According to a seventh aspect of the present invention, there is provided a fin for heat transfer,
A refrigerant flow tube having a straight tube portion and a curved tube portion continuously provided, and a pair of straight tube portions of the tube are provided in the fins with long holes to be inserted into both ends in the longitudinal direction, and the inside of the curved tube portion of the tube is provided. The method for manufacturing a heat exchanger, wherein the tip of an insertion jig having a thickness smaller than the width of the long hole of the fin is locked and the tube is inserted into the long hole of the fin while pressing the insertion jig. Are formed in a pulse shape or meandering shape, and the long holes are provided at opposing portions of the fin at an interval, and the width of the long holes is reduced at portions of each of the long holes except for both ends for inserting a tube. A wide portion that is partially enlarged in a direction orthogonal to the longitudinal direction is provided, and the tube is connected to the fin using an insertion jig in which a portion corresponding to the wide portion is partially projected in the thickness direction. To be inserted into each slot . Accordingly, since the insertion jig has a portion that partially protrudes in the thickness direction, the rigidity of the insertion jig in the thickness direction is increased, and the amount of bending is reduced. In addition, since the fins continuously and integrally have opposing portions at intervals, it is not necessary to arrange a large number of flat fins one by one before inserting the tube.

Further, according to claim 8, a fin for heat transfer is provided;
A refrigerant flow tube having a straight tube portion and a curved tube portion continuously provided, and a pair of straight tube portions of the tube are provided in the fins with long holes to be inserted into both ends in the longitudinal direction, and the inside of the curved tube portion of the tube is provided. The method for manufacturing a heat exchanger, wherein the tip of an insertion jig having a thickness smaller than the width of the long hole of the fin is locked and the tube is inserted into the long hole of the fin while pressing the insertion jig. Are formed in a pulse shape or meandering shape, and the long holes are respectively provided in opposing portions of the fin at an interval, and the fins are bent in the tube insertion direction at portions except for both ends for inserting the tube. An insertion jig provided by providing a bent portion in which the width of the long hole can be partially enlarged in a direction orthogonal to the longitudinal direction, and projecting a portion corresponding to the bent portion in the thickness direction. Of the insertion jig While bending the bending portion in out portion so that to insert the tube into the long holes of the fins.
Accordingly, since the insertion jig has a portion that partially protrudes in the thickness direction, the rigidity of the insertion jig in the thickness direction is increased, and the amount of bending is reduced. In this case, the fin has a larger heat transfer area by the amount of the bent portion. In addition, since the fins continuously and integrally have opposing portions at intervals, it is not necessary to arrange a large number of flat fins one by one before inserting the tube.

[0014]

1 to 7 show an embodiment of the present invention. FIG. 1 is an overall perspective view of a heat exchanger, FIG. 2 is a front view thereof, and FIG. 3 (a) is a left side view thereof. Fig. 3 (b) is a right side view, Fig. 4 is a front view of a long hole, Fig. 5 is a partial side view of a tube, Fig. 6 is a side view of a pipe-like member, and Fig. 7 is a perspective view showing a tube insertion method. FIG.

The heat exchanger comprises a heat transfer fin 1 and a meandering refrigerant flow tube 2 having a straight pipe portion 2a and a curved pipe portion 2b continuously. The fin 1 is bent in a pulse shape. Is formed. That is, the fin 1 has a long hole 1a at a portion facing each other at an interval, and each of the long holes 1a
A pair of straight pipe portions 2a of the tube 2 are inserted into both ends in the longitudinal direction of the tube 2. Both ends of each elongated hole 1a in the longitudinal direction form a tube insertion portion 1b, and the tube insertion portion 1b is formed in a circular shape corresponding to the outer diameter of the tube 2. In this case, the portion of each elongated hole 1a excluding the tube insertion portion 1b is formed to have a width W1 smaller than the inner diameter D1 of the tube insertion portion 1b.

On the other hand, the curved tube portion 2b of the tube 2 has a long hole 1a.
Is formed smaller than the outer diameter D2 of the straight pipe portion 2a, and the thickness T1 is the width W1 of the elongated hole 1a.
Are also formed slightly smaller.

The traction tool 3 shown in FIG. 7 is for inserting the tube 2 into each long hole 1a of the fin 1. That is,
The traction tool 3 includes a wire portion 3a inserted into each elongated hole 1a of the fin 1 and a connection portion 3b attached to one end of the wire portion 3a.
b so as to be detachably connected. In this case, it is possible to use various shapes such as an annular member or a hook-like member that can be partially opened and closed, as the connecting portion 3b. Further, the connecting portion 3b of the traction tool 3 may be omitted, and the wire portion 3a may be directly bound to the tube 2.

In the case of manufacturing the heat exchanger, as shown in FIG. 6, a plurality of pipe-shaped members in which a pair of straight pipes 2a and one curved pipe 2b connecting one end thereof are integrally formed in advance. After each P (so-called hairpin pipe) is inserted into each long hole 1a of the fin 1, the other ends of the straight pipe portions 2a of these pipe-shaped members are connected by a plurality of curved pipe portions 2b each formed of a separate component P '. By doing so, a meandering tube 2 is formed. In this case, as shown in FIG. 7, the traction tool 3 is inserted into each of the long holes 1a of the fin 1, and the connecting portion 3b of the traction tool 3 is disposed on one end side of the fin 1. The tube 2 is inserted into each long hole 1a of the fin 1 by pulling the wire 3a of the traction tool 3 toward the other end of the fin 1. At that time, since the fins 1 are formed continuously and integrally at opposing portions with an interval therebetween, when the tube 2 is inserted, a large number of flat fins are arranged one by one in advance as in the related art. There is no need to keep it.

As described above, according to the present embodiment, the curved tube portion 2b of the tube 2 is pulled from one end of the fin 1 to the other end thereof through the respective long holes 1a of the fin 1, whereby the tube 2 is Since the pair of straight pipes 2a and one curved pipe 2b connecting one end thereof are inserted into each long hole 1a of the fin 1, the tube 2 does not bend when inserted into the fin 1, Moreover, the operation of inserting the tube 2 can be performed extremely easily. Therefore, the tube 2 to be inserted into the fin 1 can be made long or the diameter can be made small, and the heat exchanger body can be made long and the tube 2 can be made small in diameter. At this time, since the tube 2 is pulled using the wire-shaped pulling tool 3 having one end connected to the tube 2, the tube 2 can be pulled easily and reliably. In addition, since the fins 1 are formed by a pulse-shaped member having portions that face each other at intervals and are continuously integrated, a large number of flat fins must be arranged one by one before inserting the tube 2. Therefore, man-hours in the manufacturing process can be greatly reduced.

In the above-described embodiment, the fins 1 which are bent at right angles in a pulse shape are used. However, so-called corrugated fins which are bent in a meandering shape may be used. Although the fin 1 is formed by one pulse-shaped member, the fin 1 may be divided into a plurality of tubes 2 in the longitudinal direction, for example, when a long heat exchanger is manufactured.

8 to 12 show another embodiment of the present invention. FIG. 8 is a front view of a long hole, FIG. 9 is a partial plan view of a tube and an insertion jig, FIG. FIG.
FIG. 12 is a front sectional view, and FIG. 12 is a perspective view showing a tube insertion method. The same components as those in the above embodiment are denoted by the same reference numerals.

That is, the fins 1 shown in FIG. 1 are formed in a pulse shape in the same manner as in the above-described embodiment. ing. In this case, the portion of each slot 1a except the tube insertion portion 1b is the tube insertion portion 1b.
And has a width W1 smaller than the inner diameter D1 of the
A wide portion 1c is provided by vertically extending a central portion in the longitudinal direction on both sides in the width direction.

The insertion jig 4 shown in FIGS. 9 to 12 is for inserting the tube 2 into each long hole 1 a of the fin 1. That is, the insertion jig 4 has a jig body 4a formed in a long shape, the width W2 of the jig body 4a is smaller than the interval L between the pair of straight pipes 2a of the tube 2, and the thickness thereof is T2 is formed smaller than the width W1 of the long hole 1a of the fin 1. At the tip of the insertion jig 4 is provided a tube engaging portion 4b for engaging the inside of the curved tube portion 2b of the tube 2, and the end surface of the tube engaging portion 4b has a circular shape corresponding to the inner diameter of the curved tube portion 2b. It is formed and curved along the outer shape of the tube 2. Further, a pair of protrusions 4c are provided at the center in the width direction of the jig body 4a on both sides in the thickness direction, and each of the protrusions 4c is integrated with the jig body 4a.
In the longitudinal direction. In this case, the outer shape of each protrusion 4c is formed slightly smaller than the wide portion 1c of the long hole 1a.

In the case of manufacturing the heat exchanger, as shown in FIG. 12, the tube locking portion 4b of the insertion jig 4 is locked inside the curved tube portion 2b of the tube 2, and the insertion jig 4 is pressed. The tube 2 is inserted into each of the long holes 1a of the fin 1 while doing so. At this time, a pair of straight pipe portions 2a of the tube 2 are inserted into the respective tube insertion portions 1b of the elongated holes 1a, and the straight pipe portions 2a
Are held at both ends without approaching the center of the long hole 1a. When the insertion jig 4 is inserted into the fin 1, each protruding portion 4c of the insertion jig 4 passes through the wide portion 1c of each long hole 1a. In this case, since the insertion jig 4 has each protruding portion 4c in the thickness direction of the jig main body 4a, the rigidity in the thickness direction increases, and the amount of deflection in the thickness direction decreases.

As described above, according to the present embodiment, the wide portion 1c formed by partially expanding the long hole 1a in the width direction is provided in each long hole 1a of the fin 1 into which the tube 2 is inserted. The projecting portion 4c through which the wide portion 1c is inserted is provided on the second insertion jig 4 to improve the rigidity of the jig body 4a in the thickness direction, thereby reducing the amount of bending thereof. The tube 2 to be inserted can be lengthened or the diameter can be reduced, so that the length of the heat exchanger body can be increased and the diameter of the tube 2 can be reduced. Also, in the present embodiment, the fins 1 are formed by pulse-shaped members, similarly to the above-described embodiment, so that the work of arranging a large number of fins is not required unlike the related art, and the number of steps in the manufacturing process can be greatly reduced. Can be.

In the above-described embodiment, each of the projecting portions 4c of the insertion jig 4 is provided integrally with the jig main body 4a. However, as shown in FIG. The formed protrusions 4d may be joined by welding or the like.

As a modification of the present invention, as shown in FIG. 14, the fin 1 is provided with an elongated hole 1d having a wide portion 1c only on one side in the width direction, and the jig body of the insertion jig 4 is correspondingly provided. A protrusion 4c is provided only on one side in the thickness direction of 4a, or a diamond-shaped long hole 1e whose width is gradually increased from both sides in the longitudinal direction toward the center as shown in FIG. The jig body 4e of the jig 4 may be formed so as to gradually increase in thickness from both sides in the width direction toward the center.

Further, the elongated hole 1f shown in FIG. 16 is provided with a bent portion 1g at the center in the longitudinal direction thereof to bend in the tube insertion direction to partially enlarge the width of the elongated hole 1f in a direction orthogonal to the longitudinal direction. It is a thing. That is, the bent portion 1g is formed in the fin 1 by a pair of cuts 1 extending in the width direction of the elongated hole 1f from a portion of the elongated hole 1f excluding the tube insertion portion 1b.
h, and a fold 1i of the bent portion 1g is provided starting from one end of the cut 1h. That is, in the present embodiment, when inserting the tube 2 into each long hole 1f of the fin 1, the tube 2 is inserted while bending the bent portion 1g with the protruding portion 4c of the insertion jig 4. Therefore, according to the present embodiment, the heat transfer area of the fin 1 is increased by the amount of each bent portion 1g, and the heat exchange efficiency can be improved. In this case, each bent portion 1g is formed by the cut 1h and the fold 1i.
Bends surely.

The bent portion 1g has a groove 1j provided along the fold line 1i as shown in FIG. 17, and this groove 1j is provided on both surfaces of the fin 1 respectively.
g can be bent in any direction of the thickness direction of the fin 1. Thereby, it is not necessary to specify the direction of the fin 1 with respect to the insertion direction of the tube 2, and the fin 1 can be quickly arranged at the time of manufacturing.

The elongated hole 1k shown in FIG. 18 has a notch 1h at the center in the longitudinal direction, and a fold 1c is formed obliquely from one end of the notch 1h to each tube insertion portion 1b.
i is provided. Thereby, as shown in FIG. 15, the insertion jig 4 in which the jig main body 4e is formed so as to gradually increase in thickness from both sides in the width direction toward the center can be applied.

[0031]

As described above, according to the method for manufacturing a heat exchanger of the first aspect, when inserting the tube into the fin, the tube does not bend and the insertion operation can be performed extremely easily. The size of the heat exchanger body can be increased and the tube diameter can be reduced.
It is possible to accurately cope with the production of a heat exchanger for refrigeration equipment and a reduction in the diameter of a tube accompanying the change in the refrigerant used. Also,
When inserting the tube, it is not necessary to arrange a large number of flat fins one by one in advance, so that the number of steps in the manufacturing process can be greatly reduced.

According to the method for manufacturing a heat exchanger of the second aspect, in addition to the effect of the first aspect, the tube is pulled by using a wire-like pulling tool having one end connected to the tube. In addition, the tube can be easily and reliably pulled, which is extremely advantageous for practical use.

According to the heat exchanger of the third aspect, in the manufacture thereof, the tube can be inserted into the fin by using the insertion jig having a small amount of bending, so that the length of the heat exchanger body can be increased and the tube can be lengthened. Thus, it is possible to accurately cope with the manufacture of a heat exchanger for large-sized refrigeration / refrigeration equipment and the reduction in the diameter of a tube accompanying a change in the refrigerant used. In addition, when inserting the tube, it is not necessary to arrange a large number of flat fins one by one in advance, so that the number of steps in the manufacturing process can be significantly reduced.

According to the heat exchanger of the fourth aspect, similarly to the third aspect, the length of the heat exchanger body can be increased, the diameter of the tube can be reduced, and the number of manufacturing steps can be reduced. The heat area can be increased, and the heat exchange efficiency can be improved.

According to the heat exchanger of the fifth aspect, in addition to the effect of the fourth aspect, the bent portion of the fin can be reliably bent by inserting the tube, which is extremely advantageous for practical use.

According to the heat exchanger of the sixth aspect, in addition to the effect of the fifth aspect, the bent portion of the fin can be bent in any direction in the thickness direction of the fin. There is no need to specify the direction of the fin with respect to the direction, and the fin arrangement operation during manufacturing can be performed quickly.

According to the method of manufacturing a heat exchanger of the seventh aspect, the amount of bending of the insertion jig for inserting the tube into the long hole of the fin can be reduced, so that the length of the heat exchanger body can be increased. Therefore, it is possible to accurately cope with the production of a heat exchanger for a large-sized refrigeration / refrigeration equipment and the reduction of the diameter of a tube accompanying a change in a refrigerant to be used. In addition, when inserting the tube, it is not necessary to arrange a large number of flat fins one by one in advance, so that the number of steps in the manufacturing process can be significantly reduced.

According to the method for manufacturing a heat exchanger according to the eighth aspect, similarly to the seventh aspect, it is possible to increase the length of the heat exchanger body, reduce the diameter of the tube, and reduce the number of manufacturing steps. The heat transfer area of the fin can be increased, and the heat exchange efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a heat exchanger showing one embodiment of the present invention.

FIG. 2 is a front view of a heat exchanger.

FIG. 3 is a left side view and a right side view of the heat exchanger.

FIG. 4 is a front view of a long hole.

FIG. 5 is a partial side view of a tube.

FIG. 6 is a side view of a pipe-shaped member.

FIG. 7 is a perspective view showing a tube insertion method.

FIG. 8 is a front view of a long hole showing another embodiment of the present invention.

FIG. 9 is a partial plan view of a tube and an insertion jig.

FIG. 10 is a partial side view of a tube and an insertion jig.

FIG. 11 is a front sectional view of a tube and an insertion jig.

FIG. 12 is a perspective view showing a tube insertion method.

FIG. 13 is a front sectional view of an insertion jig showing an example in which a protruding portion is formed by a separate component.

FIG. 14 is a front sectional view showing a modification of the elongated hole and the insertion jig.

FIG. 15 is a front sectional view showing another modified example of the elongated hole and the insertion jig.

FIG. 16 is a front view showing another embodiment of the long hole.

FIG. 17 is a side sectional view of a bent portion.

FIG. 18 is a front view showing another embodiment of the long hole.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fin, 1a ... Long hole, 1c ... Wide part, 1f ... Long hole,
1g: bent portion, 1k: elongated hole, 2: tube, 2a: straight tube portion, 2b: bent tube portion, 3: traction tool, 4: insertion jig, 4c ...
Projection.

Claims (8)

[Claims] 1. A fin for heat transfer and a refrigerant distribution tube having a straight tube portion and a curved tube portion continuously, and a pair of straight tubes of the tube are provided at both longitudinal ends of a long hole provided in the fin. In the method for manufacturing a heat exchanger, a slot is inserted in each of the fins bent in a pulsed or meandering shape, and the elongated holes are provided in opposing portions at intervals. A method for manufacturing a heat exchanger, comprising inserting a tube into each long hole of a fin by pulling the tube from one end side to the other end side of the fin through the long hole. 2. A wire-like traction tool having one end connected to a curved tube portion of a tube is inserted into each slot of the fin, and the other end of the traction tool is moved from one end to the other end in the fin arrangement direction. The method for manufacturing a heat exchanger according to claim 1, wherein the tube is inserted into each elongated hole of the fin by pulling. 3. A fin for heat transfer and a refrigerant distribution tube having a straight tube portion and a curved tube portion continuously, and a pair of straight tubes of the tube are provided at both longitudinal ends of a long hole provided in the fin. In the heat exchanger having the fins inserted therein, the fins are formed in a pulsed or meandering shape, and the slots are provided at opposing portions of the fins at a distance from each other. In the part except both ends,
A heat exchanger comprising a wide portion in which a width of a long hole is partially enlarged in a direction orthogonal to a longitudinal direction. 4. A fin for heat transfer and a refrigerant distribution tube having a straight tube portion and a curved tube portion continuously, and a pair of straight tubes of the tube are provided at both longitudinal ends of a long hole provided in the fin. In the heat exchanger having the fins inserted therein, the fins are formed in a pulsed or meandering shape, and the slots are provided at opposing portions of the fins at a distance from each other. In the part except both ends,
A heat exchanger comprising a bent portion that bends in a tube insertion direction to partially increase a width of a long hole in a direction orthogonal to the longitudinal direction. 5. The fin is provided with at least one notch extending in a width direction of the long hole from a portion excluding both ends of the long hole for inserting the tube, and a fold of the bent portion is formed from one end of the notch as a base point. The heat exchanger according to claim 4, wherein 6. The heat exchanger according to claim 5, wherein the fold of the bent portion is formed by grooves provided on both sides of the fin. 7. A fin for heat transfer and a refrigerant flow tube having a straight tube portion and a curved tube portion continuously, and a pair of straight tube portions of the tube are inserted into both ends of the tube in the fin. A long hole is provided, and the tip of the insertion jig having a thickness smaller than the width of the long hole of the fin is locked inside the curved tube portion of the tube, and the tube is inserted into the long hole of the fin while pressing the insertion jig. In the method of manufacturing a heat exchanger to be inserted, the fins are bent in a pulse shape or a meandering shape, and the slots are provided at portions of the fins opposed to each other at an interval from each other. Except for both ends,
A wide portion is provided in which the width of the long hole is partially enlarged in a direction orthogonal to the longitudinal direction, and an insertion jig is used in which a portion corresponding to the wide portion is partially projected in the thickness direction. A method for manufacturing a heat exchanger, comprising inserting tubes into respective long holes of fins. 8. A fin for heat transfer and a tube for refrigerant distribution having a straight tube portion and a curved tube portion continuously, and a pair of straight tube portions of the tube are inserted into the fin at both ends in the longitudinal direction. A long hole is provided, and the tip of the insertion jig having a thickness smaller than the width of the long hole of the fin is locked inside the curved tube portion of the tube, and the tube is inserted into the long hole of the fin while pressing the insertion jig. In the method of manufacturing a heat exchanger to be inserted, the fins are bent in a pulse shape or a meandering shape, and the slots are provided at portions of the fins opposed to each other at an interval from each other. Except for both ends,
A bent portion that can be partially expanded in the direction perpendicular to the longitudinal direction by bending the elongated hole in the tube insertion direction is provided, and the portion corresponding to the bent portion is partially projected in the thickness direction. A method for manufacturing a heat exchanger, comprising inserting a tube into each long hole of a fin while bending a bent portion at a protruding portion of the insertion jig using the insertion jig.