JPH1038487A - Heat exchanger and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the tightness of attachment between a heat-exchanger tube and a plate-shaped fin in a heat exchanger and enable easily assembling them. SOLUTION: The subject relates to the manufacture of a heat exchanger which has a plurality of plate-shaped fins 1 arranged at suitable intervals in a row and a plurality of flat heat-exchanger tubes 3 which are passed through holes 2 provided in the plate-shaped fins 1 respectively. The through holes 2 in the plate-shaped fins 1 are each formed in a tapering slit and each of the flat heat-exchanger tubes 3 is formed in a tapering or flat shape in cross section so as to be fitted in a narrow tapering part 2b of the through hole 2. After inserting the flat heat-exchanger tube 3 into the through hole 2 on the side of an expanded tapering part 2a the plate-shaped fin 1 and the flat heat-exchanger tube 3 are moved relatively to each other so as to fit the flat heat-exchanger tube 3 in the narrow tapering part 2b of the through hole 2 tightly.

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 As a conventional heat exchanger of this type, as shown in FIG. 9, 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. 10 and 11, a plate-like fin a having an insertion hole b is attached to a jig facing the same. 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 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 first aspect of the present invention, a plurality of plate-like fins arranged at appropriate intervals and insertion holes provided in these plate-like fins are provided. In manufacturing a heat exchanger including a plurality of flat heat exchange tubes penetrating, the insertion hole of the plate-like fin is formed by a tapered long hole, and the cross-sectional shape of the flat heat exchange tube is formed. , Formed in a taper shape that can fit into the narrow taper portion of the insertion hole, after inserting the flat heat exchange tube on the expanding tapered portion side of the insertion hole, a plate-shaped fin and a flat heat exchange tube Are relatively moved to bring the flat heat exchange tube into close contact with the narrow tapered portion of the insertion hole.

According to a second aspect of the present invention, there are provided a plurality of plate-like fins arranged at appropriate intervals and a plurality of flat heat exchange tubes penetrating through insertion holes provided in these plate-like fins. In manufacturing the heat exchanger, the insertion hole of the plate-like fin is formed by a tapered long hole, and the cross-sectional shape of the flat heat exchange tube can be fitted to the narrow tapered portion of the insertion hole. After forming the flat heat exchange tube on the side of the expansion taper portion of the insertion hole, the flat heat exchange tube is relatively moved between the plate-like fin and the flat heat exchange tube, and the flat heat exchange tube is formed. Is brought into close contact with the narrow tapered portion of the insertion hole.

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 are provided a plurality of plate-like fins arranged at appropriate intervals and a plurality of flat heat exchange tubes penetrating through insertion holes provided in these plate-like fins. In the heat exchanger, the insertion hole of the plate-like fin is formed by a tapered long hole, and the flat heat exchange tube is formed in a tapered shape in close contact with a narrow tapered portion of the insertion hole. Features.

According to a fifth aspect of the present invention, there are provided a plurality of plate-like fins arranged at appropriate intervals and a plurality of flat heat exchange tubes penetrating through insertion holes provided in these plate-like fins. In the heat exchanger, the insertion hole of the plate-shaped fin is formed by a tapered long hole, and the flat heat exchange tube is formed in a flat shape in close contact with a narrow tapered portion of the insertion hole. Features.

According to a sixth aspect of the present invention, in the heat exchanger according to the fourth or fifth aspect, an upright piece is formed at an opening edge of the insertion hole of the plate-like fin to contact an adjacent plate-like fin. , Characterized in that.

According to the first, second, fourth and fifth aspects of the present invention, after the flat heat exchange tube is inserted into the expansion taper portion side of the insertion hole provided in the plate fin, the flat fin and the flat heat exchange tube are inserted. The flat heat exchange tube can be closely moved to the narrow tapered portion of the insertion hole by moving the flat heat exchange tube relatively, so that the flat heat exchange tube can be The heat exchanger having 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 aspect of the present invention, the plate-shaped fins arranged in a large number are formed at the opening edges of the insertion holes of the plate-shaped fins by forming upstanding pieces abutting on the 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.

[0016]

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.

In the heat exchanger, a plurality of plate-like fins 1 arranged at appropriate intervals and a substantially flat elliptical tapered through hole 2 provided in these plate-like fins 1 are parallel to each other. A plurality of tapered flat heat exchange tubes 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 exchange tubes 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, one end of the insertion hole 2 provided in the plate-like fin 1 has an expanding tapered portion 2a.
And the other end is formed in a tapered long hole shape having a narrow tapered portion 2b. The cross-sectional shape of the flat heat exchange tube 3 is formed in a tapered shape capable of closely adhering to the narrow tapered portion 2 b side of the insertion hole 2. The flat heat exchange tube 3 has a plurality of passages 7 defined by a plurality of reinforcing walls 6.

Further, a pair of upright pieces 1 is provided on both sides of the opening edge of the insertion hole 2 of the plate-like fin 1, 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. Is maintained at a constant level, and the adhesion to the flat heat exchange tube 3 is improved.

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

In order to assemble the heat exchanger constructed as described above, first, a predetermined number of plate 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 hole similar to the tapered insertion hole 2 provided in the plate-like fin 1.

Next, as shown in FIG.
The flat heat exchange tube 3 is inserted into the expanded tapered portion 2a side. After inserting the flat heat exchange tube 3 into the expansion tapered portion 2a of each insertion hole 2, the plate-like fin 1 and the flat heat exchange tube 3 are relatively moved, that is, the insertion hole 2 and the flat heat exchange tube By moving the flat heat exchange tube 3 toward the narrow tapered portion 2b of the insertion hole 2 by moving the flat heat exchange tube 3 in the long axis direction, the flat heat exchange tube 3 is brought into close contact with the narrow tapered portion 2b of the insertion hole 2. (FIG. 6
(B)). In this case, the expanding tapered portion 2a of the insertion hole 2
A gap is formed between the flat heat exchanger tube 3 and the flat heat exchange tube 3. This gap can be made as small as 2 to 3 mm, for example, and can be closed by the capillary action of the brazing material during brazing. .

After the flat heat exchange tube 3 is inserted into the insertion hole 2 of the plate-like fin 1 as described above, the flat heat exchange tube 3 is inserted into the insertion hole (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 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 hole 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 way, the lower side 31 of the flat heat exchange tube 3 and the side 2 of the insertion hole 2
1 can be inserted along the flat heat exchange tube 3 and then moved toward the narrow tapered portion 2b, so that assembling work of the heat exchanger can be further facilitated and the plate-like fins can be inserted. 1 and the flat heat exchange tube 3 can be stabilized.

Further, 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 tapered portion 2b of the insertion hole 2 has been described. Need not necessarily be tapered. For example, as shown in FIG. 8, the upper and lower portions which can fit into the narrow tapered portion 2b of the insertion hole 2 (in this case, a tapered insertion hole having a slope on the upper side). A flat heat exchange tube 3A whose sides are parallel may be used.

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 hole 2 on the side of the expanding tapered portion 2a. After inserting the flat heat exchange tube 3A into the expanded tapered portion 2a of each insertion hole 2, the plate-like fin 1 and the flat heat exchange tube 3A are relatively moved, that is, the insertion hole 2 and the flat heat exchange tube By moving the flat heat exchange tube 3A toward the narrow tapered portion 2b of the insertion hole 2 by moving the flat heat exchange tube 3A in the long axis direction of the insertion
(See FIG. 8 (b)).

In the above description, the space between the insertion holes 2 of the plate-like fin 1 is flat, but the space between the insertion holes 2 of the plate-like fin 1 is substantially perpendicular to the longitudinal direction of the insertion hole 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.

[0031]

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 opening tapered portion side of the insertion hole provided in the plate-like fin, the plate-like fin is inserted. Since the fin and the flat heat exchange tube can be relatively moved and the flat heat exchange tube can be brought into close contact with the narrow tapered portion of the insertion hole, the flat heat exchange tube can be moved without deforming the plate-like fin. The heat exchanger can be inserted into the insertion hole of the plate-like fin, and the heat exchanger can have a good heat exchange efficiency, and the 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 sixth aspect of the present invention, a plurality of plate-shaped fins are arranged at the opening edge of the insertion hole of the plate-shaped fins by forming upstanding pieces which contact the 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.

[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 hole and a standing piece provided in a plate-like fin according to the present invention.

FIGS. 6A and 6B are a schematic front view showing a state where a flat heat exchange tube is inserted into an insertion hole and a schematic front view showing a state where the insertion hole 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 hole according to the present invention, and FIG. 7B is a schematic front view showing the state in which the insertion hole 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 hole according to the present invention, and FIG. 8B is a schematic front view showing a state in which the insertion hole and the flat heat exchange tube are in close contact with each other. b).

FIG. 9 is a perspective view showing a conventional heat exchanger.

FIG. 10 is an exploded perspective view showing an assembled state of a conventional heat exchanger.

FIG. 11 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 hole 3, 3A Flat heat exchange tube 10 Standing piece 11 Aluminum alloy layer 12 Center line 21, 31 Side 22, 32 Slope

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akino Ohno 1-34-1, Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture Nippon Light Metal Corporation Group Technology Center

Claims (6)

[Claims] 1. A heat exchanger comprising a plurality of plate-like fins arranged at appropriate intervals and a plurality of flat heat-exchange tubes penetrating through insertion holes provided in these plate-like fins. In the meantime, the insertion hole of the plate-shaped fin is formed by a tapered long hole, and the cross-sectional shape of the flat heat exchange tube is formed in a tapered shape capable of fitting into the narrow tapered portion of the insertion hole. After inserting the flat heat exchange tube into the expanded tapered portion side of the insertion hole, the plate-shaped fin and the flat heat exchange tube are relatively moved, and the flat heat exchange tube is inserted into the narrow taper of the insertion hole. A method for producing a heat exchanger, comprising: 2. A heat exchanger comprising: a plurality of plate-like fins arranged at appropriate intervals; and a plurality of flat heat-exchange tubes penetrating through insertion holes provided in these plate-like fins. In the meantime, the insertion hole of the plate-shaped fin is formed by a tapered long hole, and the cross-sectional shape of the flat heat exchange tube is formed to be a flat shape that can be fitted to the narrow tapered portion of the insertion hole, After inserting the flat heat exchange tube into the expanded tapered portion side of the insertion hole, the plate-shaped fin and the flat heat exchange tube are relatively moved, and the flat heat exchange tube is inserted into the narrow taper of the insertion hole. A method for producing a heat exchanger, comprising: 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 plurality of flat heat-exchange tubes penetrating through insertion holes provided in these plate-like fins. The heat exchanger characterized in that the insertion hole of the plate-like fin is formed by a tapered long hole, and the flat heat exchange tube is formed in a tapered shape which is in close contact with a narrow tapered portion of the insertion hole. . 5. A heat exchanger comprising: a plurality of plate-like fins arranged at appropriate intervals; and a plurality of flat heat-exchange tubes penetrating through insertion holes provided in these plate-like fins. The heat exchanger characterized in that the insertion hole of the plate-like fin is formed by a tapered long hole, and the flat heat exchange tube is formed in a flat shape in close contact with a narrow taper portion of the insertion hole. . 6. The heat exchanger according to claim 4, wherein an upright piece is formed at an opening edge of the insertion hole of the plate-like fin so as to contact an adjacent plate-like fin. Heat exchanger.