JPH1089870A - Manufacture of heat exchanger and heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a close fitness between heat exchanging pipes and plate- like fins of a heat exchanger and enable its assembling operation to be easily carried out. SOLUTION: When a heat exchanger having a plurality of plate-like fins 1 properly spaced apart and arranged to each other and also having a plurality of flat heat exchanging pipes 3 penetrating to cross with these plate-like fins 1 is manufactured, an insertion groove 2 gradually narrowed from one side of each of the plate-like fins 1 toward their inner sides is formed, wherein a sectional shape of each of the flat heat exchanging pipes 3 is formed into such a tapered one or a flat shape which can be fitted to a narrow part 2b of the insertion groove 2 and a narrow part 3b of the flat heat exchanging pipe 3 is inserted at an opened and expanded part 2a of the insertion groove 2. After this operation, the plate-like fins 1 and the flat heat exchanging pipes 3 are moved in respect to each other and the flat heat exchanging pipes 3 are closely fitted to the narrow part 2b of the insertion groove 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 and a heat exchanger. More specifically, the present invention relates to a heat exchanger for use in, for example, an air conditioner for a car or a house. The present invention relates to a method of manufacturing a heat exchanger in which a plurality of plate-like fins arranged at intervals and a plurality of stages of heat exchange tubes are contacted and crossed, and a heat exchanger.

[0002]

2. Description of the Related Art Conventionally, as a heat exchanger of this type, as shown in FIG. 12, a plurality of flat fins a arranged in parallel at regular intervals and a plurality of flat fins a formed in these flat fins a are provided. A heat exchanger having a heat exchange tube c having a flat cross section penetrating the elongated hole b is known. The use of the heat exchange tube c having a flat cross section has an advantage that the loss of air resistance can be reduced as compared with the heat exchange tube having a circular shape.

In order to manufacture a heat exchanger using such a flat heat exchange tube, as shown in FIGS. 13 and 14, a plate-like fin a having an insertion hole b is formed by a jig opposed to the plate-like fin a. A large number of, for example, 500 sheets are arranged at appropriate intervals between the flat fins a and the flat heat exchange tubes c are inserted into the insertion holes b of the respective plate fins a. And then integrated by brazing, bonding or the like.

[0004]

However, in the conventional method of manufacturing this type of heat exchanger, when the flat heat exchange tube c is inserted into the insertion hole b of the plate-like fin a, FIG.
As shown in (1), there is a risk that the plate-like fins a may be bent due to friction. As a result, the intervals between the plate-like fins a become uneven, which not only deteriorates the appearance of the heat exchanger but also lowers the heat exchange efficiency. Problem. Therefore, in order to insert the flat heat exchange tube c into the insertion hole b of the plate-like fin a, there is a problem that high precision and skill are required, time and labor are required for assembling and manufacturing, and the manufacturing cost is increased. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a method of manufacturing a heat exchanger and a heat exchanger capable of improving the adhesion between a heat exchange tube and a plate-like fin and facilitating assembly. The purpose is to provide.

[0006]

In order to achieve the above object, according to the present invention, a plurality of plate-shaped fins arranged at appropriate intervals and a flat fin penetrating these plate-shaped fins in an intersecting manner are provided. In manufacturing a heat exchanger including a heat exchanger tube, the plate-like fin is formed with an insertion groove that gradually narrows inward from one side of the plate-like fin,
The cross-sectional shape of the flat heat exchange tube is formed in a tapered shape that can fit into the narrow portion of the insertion groove, and after the narrow portion of the flat heat exchange tube is inserted into the expanded portion side of the insertion groove. The plate-like fin and the flat heat exchange tube are relatively moved to bring the flat heat exchange tube into close contact with the narrow portion of the insertion groove.

According to a second aspect of the present invention, there is provided a heat exchanger having a plurality of plate-like fins arranged at appropriate intervals and a flat heat-exchange tube passing through the plate-like fins in an intersecting manner. In doing so, an insertion groove that gradually narrows inward from one side of the plate fin is formed in the plate fin, and the cross-sectional shape of the flat heat exchange tube is reduced to a narrow portion of the insertion groove. After the flat heat exchange tube is inserted into the expanded portion side of the insertion groove, the plate fin and the flat heat exchange tube are relatively moved to form a flat shape. The heat exchanger tube is brought into close contact with the narrow portion of the insertion groove.

According to a third aspect of the present invention, in the method for manufacturing a heat exchanger according to the first or second aspect, the flat heat exchange tube and the plate-like fin are formed of an aluminum alloy member, and the flat heat exchange tube and the plate fin are formed of the flat heat exchange tube. Forming an aluminum alloy layer having a lower melting point than the flat heat exchange tube and the plate-like fin on at least one surface of the heat exchange tube or the plate-like fin,
The flat heat exchange tube and the plate fin are brazed.

In this case, to form the aluminum alloy layer, for example, Al-Si, Al-Cu or Al-Cu-
A mixture of a brazing filler metal powder of Si, a flux powder and a binder is applied to the surface of a flat heat exchange tube made of aluminum or an aluminum alloy, and heated to a temperature equal to or higher than a melting temperature of the brazing filler metal to form a brazing alloy layer on the flat tube surface Can be formed.

According to a fourth aspect of the present invention, there is provided a heat exchanger including a plurality of plate-like fins arranged at appropriate intervals and a flat heat exchange tube penetrating the plate-like fins in an intersecting manner. The plate-shaped fin is formed with an insertion groove that gradually narrows inward from one side of the plate-shaped fin, and the flat heat exchange tube is formed in a tapered shape that is in close contact with a narrow portion of the insertion groove. It is characterized by that.

According to a fifth aspect of the present invention, there is provided a heat exchanger comprising a plurality of plate-like fins arranged at appropriate intervals and a flat heat exchange tube penetrating the plate-like fins in an intersecting manner. The plate-shaped fin is formed with an insertion groove that gradually narrows inward from one side of the plate-shaped fin, and the flat heat exchange tube is formed in a flat shape that is in close contact with a narrow portion of the insertion groove. It is characterized by that.

According to a sixth aspect of the present invention, in the heat exchanger according to the fourth or fifth aspect, the insertion grooves are formed alternately on both sides of the plate-shaped fin opposite to each other, and the flattened shapes are respectively formed in the insertion grooves. It is characterized in that a heat exchange tube is closely attached.

According to a seventh aspect of the present invention, in the heat exchanger according to the fourth or fifth aspect, an insertion groove is formed in a portion of the plate-like fin opposite to both sides of the plate-shaped fin, and the flattened portion is formed in each of the insertion grooves. Characterized in that the heat exchanger tubes are in close contact with each other.

[0014] The invention according to claim 8 is the invention according to claims 4 to 7.
The heat exchanger according to any one of the above, characterized in that an upstanding piece that comes into contact with an adjacent plate-like fin is formed at an opening edge of the insertion groove of the plate-like fin.

According to the first, second, fourth and fifth aspects of the present invention, after the flat heat exchange tube is inserted into the insertion groove side of the insertion groove provided in the plate fin, the flat fin and the flat heat exchange tube are inserted. The flat heat exchange tubes can be inserted into the flat fins without deforming the flat fins by moving the heat exchange tubes relative to each other so that the flat heat exchange tubes can be in close contact with the narrow portions of the insertion grooves. A heat exchanger that can be inserted into the groove and has good heat exchange efficiency can be manufactured very easily.

According to the third aspect of the present invention, at least one of the flat heat exchange tubes and the plate-like fins has
By forming an aluminum alloy layer having a lower melting point than the flat heat exchange tube and the plate fins and brazing the flat heat exchange tube and the plate fins, brazing can be facilitated. Thus, the reliability of the brazed portion can be improved.

According to the sixth and seventh aspects of the present invention, the flat heat exchange tubes can be inserted into the insertion grooves provided on both opposite sides of the plate-like fin in an intersecting manner. The right and left balance with the flat heat exchange tube can be maintained, and the heat exchange efficiency can be made uniform.

According to the eighth aspect of the present invention, a plurality of plate-shaped fins are arranged in a predetermined manner at the opening edges of the insertion grooves of the plate-shaped fins by forming upstanding pieces abutting on adjacent plate-shaped fins. Positioning can be performed at intervals, and the interval between adjacent plate-like fins can be maintained at a constant size. Further, the contact area between the plate-shaped fin and the flat heat exchange tube can be increased, and the adhesion between the plate-shaped fin and the flat heat exchange tube can be improved, and the strength of the heat exchanger can be improved.

[0019]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an example of the heat exchanger of the present invention, FIG. 2 is a perspective view showing a main part thereof, FIG. 3 is a front view of FIG. 2, and FIG. It is sectional drawing (a) which follows, and the enlarged sectional view of the B part.

The heat exchanger has a plurality of plate-shaped fins 1 arranged at appropriate intervals and a plurality of parallel tapered flats penetrating through tapered insertion grooves 2 provided in these plate-shaped fins 1. The heat exchanger tube 3 and a pair of headers 4 and 5 which are arranged at intervals from each other and are formed of pipes communicating with the flat heat exchanger tube 3 are integrally brazed. One header 4 is provided with an inlet 8 for the heat medium R, and the other header 5 is provided with an outlet 9.

In this case, as shown in FIG. 3, the insertion groove 2 provided in the plate-like fin 1 has an opening at one side of the plate-like fin 1 and gradually becomes narrower from this one side toward the inside. Is formed. That is, the insertion groove 2 is formed in a tapered shape having an enlarged portion 2a at the opening end and a narrowed portion 2b at the other end. The cross-sectional shape of the flat heat exchange tube 3 is formed in a tapered shape capable of closely adhering to the narrow portion 2 b side of the insertion groove 2. The flat heat exchange tube 3 has a plurality of passages 7 defined by a plurality of reinforcing walls 6.

A pair of upstanding pieces 1 are provided on both sides of the opening edge of the insertion groove 2 of the plate-like fin 1 facing each other, more precisely, on the long side edge.
0 is formed. As shown in FIG. 5, the standing pieces 10 are erected on the same surface side of the plate-like fins 1 in a U-shape, and contact the adjacent plate-like fins 1 to form an interval between the plate-like fins 1. Has a positioning function of maintaining the temperature of the heat exchanger constant, and an improvement in the adhesion to the flat heat exchange pipe 3 and an improvement in the strength of the heat exchanger.

In the heat exchanger constructed as described above, the headers 4 and 5 and the flat heat exchange tube 3 are formed of an extruded aluminum alloy material, and the plate fins 1 are formed of an aluminum alloy plate material. Have been.

To assemble the heat exchanger constructed as described above, first, a predetermined number of plate-like fins 1, for example, 500
Is set at a fixed interval between a pair of jigs (not shown) in a state where the upstanding pieces 10 adjacent to each other are in contact with each other. The jig is also provided with a tapered insertion groove similar to the tapered insertion groove 2 provided on the plate-like fin 1.

Next, as shown in FIG.
The narrow portion 3b of the flat heat exchange tube 3 is inserted into the widened portion 2a side. A flat heat exchange tube 3 is provided in the expanded portion 2a of each insertion groove 2.
After the narrow portion 3b is inserted, the plate-shaped fin 1 and the flat heat exchange tube 3 are relatively moved, that is, are moved in the longitudinal direction of the insertion groove 2 and the flat heat exchange tube 3, so that the flat heat The narrow portion 3b of the exchange tube 3 is moved to the narrow portion 2b side of the insertion groove 2, and the flat heat exchange tube 3 is brought into close contact with the narrow portion 2b side of the insertion groove 2 (see FIG. 6B). In this case, the expanded portion 2a of the insertion groove 2 and the expanded portion 3a of the flat heat exchange tube 3 also come into close contact with each other.

After the flat heat exchange tubes 3 are inserted into the insertion grooves 2 of the plate-like fins 1 as described above, the flat heat exchange tubes 3 are inserted into the insertion holes (see FIG. (Not shown) and connect with headers 4 and 5. Then, the headers 4 and 5, the flat heat exchange tubes 3 and the plate-like fins 1 are integrally brazed by a method to be described later to form a heat exchanger.

In this case, as shown in FIG. 4B, an aluminum alloy layer 11 having a lower melting point than the flat heat exchange tube 3 and the plate-like fin 1 is formed on the surface of the flat heat exchange tube 3. The flat heat exchange tube 3 and the plate-like fin 1 are integrally brazed by contributing as a brazing material. Similarly, the flat heat exchange tube 3 and the headers 4 and 5 are integrally brazed. Here, Al-Si, Al-Cu or Al-Cu
A brazing material comprising -Si brazing material powder and a flux powder is applied to the surface of the flat heat exchange tube 3 and heated to a temperature equal to or higher than the melting temperature of the brazing material to form an aluminum alloy layer 11 on the extruded flat tube surface. Then, the flat heat exchange tube 3 and the plate-like fin 1 are brazed.

In the above description, an aluminum alloy layer 11 having a lower melting point than the flat heat exchange tube 3 and the plate-like fin 1 is formed on the surface of the flat heat exchange tube 3 to contribute as a brazing material. However, a similar aluminum alloy layer 11 may be formed on the surface of the plate-like fin 1 instead of the flat heat exchange tube 3. Further, a similar aluminum alloy layer 11 may be formed on both the flat heat exchange tube 3 and the plate fin 1, and the flat heat exchange tube 3 and the plate fin 1 may be integrally brazed.

In the above embodiment, the case where the insertion groove 2 and the flat heat exchange tube 3 are formed in a tapered shape having a symmetrical gradient with respect to the center line 12 extending in the horizontal direction has been described. It is not necessary to have a tapered shape. For example, as shown in FIG.
May be formed in a tapered shape having sides 21 and 31 parallel to the center line 12 and gradients 22 and 32 with respect to the center line 12 and the sides 21 and 31. By forming in this manner, the lower side 31 of the flat heat exchange tube 3 and the side 2 of the insertion groove 2
1, the narrow portion 3b of the flat heat exchange tube 3 can be inserted and then moved to the narrow portion 2b side, so that the assembling work of the heat exchanger can be further facilitated. The connection between the plate-like fin 1 and the flat heat exchange tube 3 can be stabilized.

In the above embodiment, the case where the cross-sectional shape of the flat heat exchange tube 3 is formed in a tapered shape capable of fitting into the narrow portion 2b of the insertion groove 2 has been described. It is not necessary to have a tapered shape. For example, as shown in FIG. 8, upper and lower sides that can be fitted into the narrow portion 2b of the insertion groove 2 (in this case, a tapered insertion groove having a slope on the upper side) are formed. It may be a parallel flat heat exchange tube 3A.

The flat heat exchange tube 3A thus formed
In order to assemble the heat exchanger using the fins, a predetermined number of, for example, 50 plate-like fins 1 are set as described above, and
As shown in (a), the flat heat exchange tube 3A is inserted into the insertion groove 2 inside the expanded portion 2a. After inserting the flat heat exchange tube 3A into the enlarged portion 2a of each insertion groove 2, the plate-like fin 1 and the flat heat exchange tube 3A move relatively, that is, the insertion groove 2 and the flat heat exchange tube 3A. 8, the flat heat exchange tube 3A is moved to the narrow portion 2b side of the insertion groove 2, and the flat heat exchange tube 3A is brought into close contact with the narrow portion 2b side of the insertion groove 2 (FIG. 8). (B)). When the flat heat exchange tube 3A is inserted into the tapered insertion groove 2, a gap is formed between the expanded portion 2a of the insertion groove 2 and the flat heat exchange tube 3A. Therefore, it can be closed by the capillary action of the brazing material at the time of brazing.

In the above-described embodiment, the flat heat exchange tubes 3 and 3A are inserted into the insertion grooves 2 that open on one side of the plate-like fins 1.
Has been described, but the invention is not limited to the case where the flat heat exchange tubes 3 and 3A are inserted into the insertion grooves 2 which are opened only on one side of the plate-like fins 1. Alternatively, the insertion grooves 2 may be provided on two opposing sides of the heat exchanger 2, and the flat heat exchange tubes 3 and 3A may be inserted into the respective insertion grooves 2.

In this case, as shown in FIG. 9A, tapered insertion grooves 2 gradually narrowing inward from opposite sides of the plate-like fin 1 are provided alternately. After the narrow portion 3b of the tapered flat heat exchange tube 3 is inserted into the widened portion 2a side, the narrow portion 3b of the flat heat exchange tube 3 is moved toward the narrow portion 2b of the insertion groove 2 to be in close contact therewith. (FIG. 9
(B)). Alternatively, as shown in FIG.
Tapered insertion groove 2 having a parallel side 21 and a slope 22 gradually narrowing inward from the opposite side of plate-like fin 1
And a flat heat exchange tube 3 having a parallel side 31 and a slope 32 or a flat heat exchange tube 3A having upper and lower sides parallel to each other is inserted into the insertion groove 2 (see FIGS. 10B and 10C). .

As shown in FIG. 11 (a), insertion grooves 2 (in this case, tapered insertion grooves are provided) are provided at opposing portions of both opposing sides of the plate-like fin 1 so that each insertion The flat heat exchange tube 3 may be inserted into the groove 2 (see FIG. 11B). In FIG. 11, the insertion groove 2 is formed in a tapered shape having a parallel side 21 and a slope 22, and the flat heat exchange tube 3 is formed into a tapered shape having a parallel side 31 and a slope 32 or a flat heat exchange pipe whose upper and lower sides are parallel. The exchange pipe 3A may be used.

In the above description, the space between the insertion grooves 2 of the plate-like fins 1 is flat, but the space between the insertion grooves 2 of the plate-like fins 1 is substantially perpendicular to the longitudinal direction of the insertion grooves 2. By projecting a plurality of reinforcing portions, for example, louvers and a plurality of ribs, extending to the fin 1, the strength of the plate-like fin 1 can be increased, and bending deformation and the like of the plate-like fin 1 after assembly can be prevented.

[0037]

As described above, according to the present invention,
The following excellent effects can be obtained.

(1) According to the first, second, fourth and fifth aspects of the present invention, after the flat heat exchange tube is inserted into the expanded portion side of the insertion groove provided in the plate fin, the plate fin is inserted. And the flat heat exchange tube can be moved relatively to make the flat heat exchange tube adhere to the narrow portion of the insertion groove, so that the flat heat exchange tube can be The heat exchanger can be inserted into the insertion groove of the fin, and a heat exchanger having good heat exchange efficiency can be obtained, and this heat exchanger can be manufactured very easily.

(2) According to the third aspect of the present invention, at least one of the flat heat exchange tube and the plate-like fin has an aluminum surface having a lower melting point than the flat heat exchange tube and the plate-like fin. By forming the alloy layer and brazing the flat heat exchange tube and the plate-like fin, brazing can be facilitated and the reliability of the brazed portion can be improved.

(3) According to the invention as set forth in claim 6 or 7, the insertion grooves provided on both opposite sides of the plate-like fin are provided with:
Since flat heat exchange tubes can be inserted in a cross shape,
The left and right balance between the plate-like fin and the flat heat exchange tube can be maintained, and the heat exchange efficiency can be made uniform.

(4) According to the eighth aspect of the present invention, a plurality of plate-shaped fins are arranged at the opening edges of the insertion grooves of the plate-shaped fins by forming upstanding pieces abutting on adjacent plate-shaped fins. Can be positioned at predetermined intervals, and the interval between adjacent plate-like fins can be maintained at a constant size. Further, the contact area between the plate-shaped fin and the flat heat exchange tube can be increased, and the adhesion between the plate-shaped fin and the flat heat exchange tube can be improved, and the strength of the heat exchanger can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a heat exchanger of the present invention.

FIG. 2 is a perspective view showing a main part of the heat exchanger of FIG.

FIG. 3 is a front view of FIG. 2;

4A and 4A are cross-sectional views taken along line AA in FIG.
5B is an enlarged sectional view (b) of a portion B of FIG.

FIG. 5 is a perspective view showing an insertion groove and a standing piece provided in a plate-like fin according to the present invention.

FIG. 6 is a schematic front view (a) showing a state where a flat heat exchange tube is inserted into an insertion groove and a schematic front view (b) showing a state where the insertion groove and the flat heat exchange tube are in close contact with each other in the present invention. is there.

FIG. 7A is a schematic front view showing another state in which the flat heat exchange tube is inserted into the insertion groove according to the present invention, and FIG. 7B is a schematic front view showing the state in which the insertion groove and the flat heat exchange tube are brought into close contact with each other. ).

FIG. 8A is a schematic front view showing still another state in which the flat heat exchange tube is inserted into the insertion groove according to the present invention, and FIG. 8B is a schematic front view showing a state where the insertion groove and the flat heat exchange tube are in close contact with each other. b).

FIG. 9 is a schematic front view (a) showing a state in which a flat heat exchange tube is inserted into the insertion groove when the insertion groove according to the present invention is provided on both opposite sides of the plate-like fin, and the insertion groove and the flat heat; It is a schematic front view (b) of the state which made the exchange tube contact.

FIG. 10 is a schematic front view showing another state in which the flat heat exchange tubes are inserted into the insertion grooves when the insertion grooves in the present invention are provided on both opposing sides of the plate-like fin, and FIG. It is a schematic front view (b) of a state in which the heat exchanger tubes are in close contact with each other, and a schematic front view (c) showing a modified example of (b).

FIG. 11 is a schematic front view showing still another state in which a flat heat exchange tube is inserted into the insertion groove when the insertion groove according to the present invention is provided on both opposing sides of the plate-like fin, and FIG. Schematic front view of the state where the flat heat exchange tubes are in close contact (b)
It is.

FIG. 12 is a perspective view showing a conventional heat exchanger.

FIG. 13 is an exploded perspective view showing an assembled state of a conventional heat exchanger.

FIG. 14 is a schematic side view showing a state in which a flat heat exchange tube is inserted into a plate-like fin in a conventional heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate-shaped fin 2 Insertion groove 2a Expanding part of insertion groove 2 2b Narrow part of insertion groove 2 3, 3A Flat heat exchange tube 3a Expansion part of flat heat exchange tube 3 3b Narrowness of flat heat exchange tube 3 Part 10 Standing piece 11 Aluminum alloy layer 12 Center line 21, 31 Side 22, 32 Slope

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Komaki 161 Kambara, Kambara-cho, Abara-gun, Shizuoka Japan Nippon Light Metal Co., Ltd. Inside the Kambara Heat Exchange Products Factory (72) Inventor Yasuhiko Tanaka 161 Kambara, Kambara-cho, Ahara-gun, Shizuoka Japan Light Metal Co., Ltd.

Claims (8)

[Claims] In manufacturing a heat exchanger including a plurality of plate-like fins arranged at appropriate intervals and a flat heat exchange tube penetrating the plate-like fins in an intersecting manner, In the plate-shaped fin, an insertion groove that gradually narrows inward from one side of the plate-shaped fin is formed, and the cross-sectional shape of the flat heat exchange tube is tapered so as to fit into the narrow portion of the insertion groove. After inserting the narrow portion of the flat heat exchange tube into the expanded portion side of the insertion groove, the plate-shaped fin and the flat heat exchange tube are relatively moved to form a flat heat exchange tube. A method for manufacturing a heat exchanger, comprising: bringing a tube into close contact with a narrow portion of an insertion groove. 2. In manufacturing a heat exchanger including a plurality of plate-like fins arranged at appropriate intervals and a flat heat exchange tube penetrating the plate-like fins in an intersecting manner, In the plate-shaped fin, an insertion groove that gradually narrows inward from one side of the plate-shaped fin is formed, and the cross-sectional shape of the flat heat exchange tube can be fitted into a narrow portion of the insertion groove. After inserting the flat heat exchange tube on the expanded portion side of the insertion groove, the plate-shaped fin and the flat heat exchange tube are relatively moved to insert the flat heat exchange tube. A method for manufacturing a heat exchanger, wherein the heat exchanger is brought into close contact with a narrow portion of a groove. 3. The method for manufacturing a heat exchanger according to claim 1, wherein the flat heat exchange tube and the plate-like fin are formed of an aluminum alloy member, and the flat heat exchange tube or the plate-like fin is formed of an aluminum alloy member. An aluminum alloy layer having a lower melting point than the flat heat exchange tube and the plate-like fin is formed on at least one surface of the fins, and the flat heat exchange tube and the plate-like fin are brazed. Method of manufacturing a heat exchanger. 4. A heat exchanger comprising: a plurality of plate-like fins arranged at appropriate intervals; and a flat heat exchange tube penetrating the plate-like fins in an intersecting manner. An insertion groove that gradually narrows inward from one side of the plate-like fin is formed, and the flat heat exchange tube is formed in a tapered shape that is in close contact with a narrow portion of the insertion groove. And heat exchanger. 5. A heat exchanger comprising: a plurality of plate-like fins arranged at appropriate intervals; and a flat heat exchange tube penetrating the plate-like fins in an intersecting manner. An insertion groove that gradually narrows inward from one side of the plate-like fin is formed, and the flat heat exchange tube is formed in a flat shape that is in close contact with a narrow portion of the insertion groove. And heat exchanger. 6. The heat exchanger according to claim 4, wherein insertion grooves are formed alternately on opposite sides of the plate-like fins, and the flat heat exchange tubes are closely fitted in the insertion grooves. A heat exchanger characterized by the following. 7. The heat exchanger according to claim 4, wherein an insertion groove is formed in a portion of the plate-shaped fin opposite to both sides of the plate-shaped fin, and the flat heat exchange tubes are closely fitted in the insertion groove, respectively. A heat exchanger, comprising: 8. The heat exchanger according to claim 4, wherein an upstanding piece that contacts an adjacent plate-like fin is formed at an opening edge of the insertion groove of the plate-like fin. A heat exchanger.