JP2918151B2 - Heat exchanger and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a heat exchanger of a type in which a tube is fitted into a fitting groove of a fin, and to an improvement of the heat exchanger.

[0002]

2. Description of the Related Art A heat exchanger manufactured by forming a fitting groove in a corrugated fin and fitting a tube into the fitting groove has already been proposed by the applicant.

As shown in FIGS. 10 and 11, a method of manufacturing a corrugated fin for a heat exchanger of this type includes an upper forming blade 100 having a downward convex blade having a rectangular cross section and an upward concave blade having a rectangular cross section. A press forming machine having a lower forming blade 200 having a blade is used. In this press molding machine, a roll (not shown) is provided between the upper molding blade 100 and the lower molding blade 200.
Material (fin material) 3 that is wound around and fed out in order
By pressing 00 from above and below,
This band-shaped material 300 is bent into a corrugated shape and is finally formed.

[0004]

However, in the conventional manufacturing method, there is a problem that the corrugated fins are entirely curved and round after being bent into a corrugated shape.

In order to solve this problem, the upper forming blade 100
It is desirable to minimize the gap between the upper and lower forming blades 200 as much as possible, and to bend the portion A shown in FIG. However, when the gap between them is extremely narrowed, there is a problem that the strip-shaped material 300 is squeezed to generate unnecessary elongation and residual stress, which adversely affects the fin shape after molding.

On the other hand, if the gap between them is too wide, the corners of the fin cannot be plastically deformed, and the corners (B) become rounded as shown in FIG. After the fins are bent, springback occurs at the R-shaped corners (B portions), and the corrugated fins are curved and rounded after the fins are bent. If the entire fin is curved and rounded, it becomes difficult to fit the tube into the fin fitting groove, and there is a problem that the mass productivity of this type of heat exchanger is reduced.

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a method of manufacturing a heat exchanger capable of improving the mass productivity of a heat exchanger of a type in which a tube is fitted into a fitting groove of a corrugated fin. It is to provide a heat exchanger.

[0008]

According to the first aspect of the present invention, a flat fin material is continuously supplied, a fitting groove for fitting a tube is formed in the fin material, and the fin material is formed. Is formed into a corrugated fin by using a pair of concave and convex molds to form a corrugated fin, and a tube is fitted in the fitting groove of the folded corrugated fin to produce a heat exchanger. In the method, when manufacturing corrugated fins, a substantially arc-shaped concave portion is formed at the tip of the convex mold, a convex portion corresponding to the concave portion is formed at the groove bottom of the concave mold, and at the time of bending molding of the corrugated fin, Curved portions are formed at the peaks and valleys of the corrugated fins, and after bending of the corrugated fins, the curved portions are spring-backed to suppress the fin bending phenomenon.

According to a second aspect of the present invention, a flat fin material is continuously supplied to form a fitting groove for fitting a tube in the fin material, and the fin material is formed into a pair of concave and convex molds. And forming a corrugated fin by corrugating the corrugated fin with a tube, and fitting the tube into the fitting groove of the folded corrugated fin to produce a heat exchanger. A concave portion having a substantially arc shape is formed at the tip of the corrugated fin, a convex portion corresponding to the concave portion is formed at the groove bottom of the concave mold, and a curved portion is formed at a peak portion and a valley portion of the corrugated fin when the corrugated fin is bent and formed. After the corrugated fins are formed by bending, the curved portion is spring-backed to suppress the corrugated fins from being bent.

According to the first and second aspects of the present invention, a substantially circular concave portion is formed at the tip of the convex mold of the pair of concave and convex molds, and the concave bottom corresponds to the concave portion at the groove bottom. By forming a convex portion that forms, a curved portion is formed at the peak and valley of the corrugated fin at the time of bending and forming, and after the corrugated fin is formed by bending, the curved portion is spring-backed to suppress the bending phenomenon of the corrugated fin. I do. Accordingly, the corrugated fins obtained by this do not bend and maintain the correct shape, so that the tube can be easily fitted into the fitting groove in the next fitting step of fitting the tube.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the entire heat exchanger 2.
FIG. 3 shows a part of the heat exchanger 2 in an enlarged manner, and FIGS.
Indicates a side surface of the heat exchanger 2. 1 to 5,
The corrugated fin 6 of the heat exchanger 2 has a plurality of fitting grooves 3 for fitting a tube, and the serpentine-shaped tube 5 is fitted into the fitting groove 3.

The fins 6 of the heat exchanger 2 are shown in FIG.
The manufacturing method shown in FIG. Referring to FIG. 6, in this manufacturing method, a flat aluminum (metal) fin material 30 wound around a roll 10 is continuously supplied, and a tube 5 is fitted to the fin material 30. Is formed, and the fin material 30 is formed into a corrugated shape by using a pair of concave and convex molds 23 and 21.

Hereinafter, in this specification, the term "aluminum" includes "aluminum alloy" in addition to "pure aluminum".

At the stage when the above-mentioned fitting groove 3 is formed by punching out the fin material 30, as shown in FIG. After the fin material 30 is bent along the to-be-folded portion 15 to form the corrugated fin 6, the deployment groove 3 a becomes the fitting groove 3 extending to, for example, a peak of the corrugated fin 6.

Referring to FIG. 6, a fin material 30 wound around a roll 10 is sequentially unwound from the roll 10 to form an upper forming blade 2 having a trapezoidal downwardly protruding blade of a press machine 20.
1 and the lower forming blade 23 having a trapezoidal upward concave blade, and is pressed by being vertically moved by the upper forming blade 21 and the lower forming blade 23.

As shown in FIG. 9, the upper forming blade 21 having a trapezoidal downward convex blade and the lower forming blade 23 having a trapezoidal upward concave blade in the die of the press machine 20 have a characteristic shape as shown in FIG. Having. That is, in FIG. 9, the convex blade 50 of the upper forming blade 21 has an R-shaped concave portion 52 at the vertex,
The bottom of the convex blade 50 has R-shaped convex portions 54, 54.
The radius of curvature R of the R-shaped concave portion 52 is, for example, 10.12 mm, and the radius of curvature S of the R-shaped convex portions 54, 54 is, for example, 2
5.12 mm. The inclination angle θ of the convex blade 50 is, for example, 10 degrees. On the other hand, the apex portion of the projection 77 forming the concave blade 70 of the lower forming blade 23 has an R-shaped concave portion 72, and the groove portion of the concave blade 70 has an R-shaped convex portion 74. The radius of curvature S1 of the R-shaped recess 72 is, for example, 10.00.
mm, the radius of curvature R1 of the R-shaped convex portion 74 is, for example, 25.
00 mm. Angle of inclination θ of concave blade 70 of lower forming blade 23
1 is, for example, 10 degrees.

The fin pitch PT and height H of the fins 6 manufactured using this mold are, as shown in FIG.
= 5 mm, H = 25 mm.

The radius of curvature of the concave portion 52 formed on the convex blade 50 of the upper forming blade 21 and the radius of curvature R1 of the R-shaped convex portion 74 formed on the groove bottom of the concave blade 70 of the lower forming blade 23 are determined. The size is approximately twice the fin pitch PT. In addition, the size of the radius of curvature S of the R-shaped protrusions 54 of the upper forming blade 21 and the size of the radius of curvature S1 of the R-shaped recess 72 of the lower forming blade 23 are approximately two to five times the fin pitch PT. It is.

The magnitudes of the inclination angles θ and θ1 are determined by the values of the radii of curvature of the respective portions, and are generally 5 to 30 degrees.

According to this embodiment, the corrugated fins 6 after being bent, as shown in FIG.
In a state taken out of the ridges 1 and 23, the ridges and the valleys have R-shaped portions 33a. At the same time, the corners C of the peaks and valleys of the corrugated fin 6 are plastically deformed. Since the corners C are plastically deformed and the R-shaped portions 33a are formed at the peaks and valleys, after the corrugated fins 6 are formed by bending, the R-shaped portions 33a at the peaks and valleys are marked with arrows p
Therefore, a force caused by springback of the R-shaped portion 33a is applied to the rising portion 6a of the fin 6,
That is, since a force acting in the direction of the dotted arrow acts, the shape does not become round as a whole, and as shown in FIG.
Presents a clean corrugated shape.

The corrugated fin 6 thus bent is cut into a predetermined length by using a cutting blade 40 as shown in FIG.

In short, according to this embodiment, a substantially circular concave portion is formed at the tip of the convex mold of the pair of concave and convex molds, and the concave bottom of the concave mold corresponds to the concave portion. By forming the convex portion, the corrugated fin 6 can be formed at the time of bending and forming.
A curved portion (R-shaped portion) 33a is formed at the peaks and valleys of
After bending the corrugated fins 6, the R-shaped portion 3
Since the spring 3a is spring-backed, the bending phenomenon of the corrugated fin 6 can be greatly suppressed as compared with the conventional one.

Fin 6 obtained by this embodiment
Can be stopped in a correct shape without bending, so that the tube 5 can be easily fitted into the fitting groove 3 described above. Therefore, when manufacturing a heat exchanger of a type in which the tube 5 is fitted in the fitting groove 3, mass productivity can be improved.

[0025]

As is apparent from the above description, according to the first and second aspects of the present invention, a substantially circular concave portion is formed at the tip of the convex die, and the concave bottom is formed at the groove bottom of the concave die. Form a convex portion corresponding to the concave portion, at the time of bending molding of the corrugated fin, form a curved portion at the peak and valley of the corrugated fin, and after bending the corrugated fin, spring back the curved portion, Since the bending phenomenon of the corrugated fin is suppressed, the resulting fin after bending maintains the correct shape.

Therefore, when manufacturing a heat exchanger of the type in which the tube is fitted in the fitting groove, the mass productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an entire heat exchanger manufactured by a manufacturing method of the present invention.

FIG. 2 is a side view showing the entire heat exchanger.

FIG. 3 is an enlarged perspective view showing a part of the heat exchanger.

FIG. 4 is a side view showing a heat exchanger.

FIG. 5 is another side view showing the heat exchanger.

FIG. 6 is a diagram illustrating a method for manufacturing a corrugated fin.

FIG. 7 is a plan view showing an example of a fin material for manufacturing a corrugated fin.

FIG. 8 is a view showing a manufactured corrugated fin.

FIG. 9 is a diagram showing an upper forming blade and a lower forming blade of the manufacturing apparatus.

FIG. 10 is a view showing a conventional manufacturing apparatus.

FIG. 11 is a diagram showing a state where a conventional manufacturing apparatus is bent and formed.

FIG. 12 is a view showing a fin formed by a conventional manufacturing apparatus.

[Description of Signs] 21 Upper forming blade (convex mold) 23 Lower forming blade (concave mold) 30 Fin material 52, 72 Recess 54, 74 Convex

Claims (2)

(57) [Claims] 1. A flat fin material is formed with a fitting groove for fitting a tube, and the fin material is bent into a corrugated shape using a pair of concave and convex dies to form a corrugated fin. In the heat exchanger manufactured by fitting a tube into the fitting groove of the corrugated fin, when manufacturing the corrugated fin, a substantially arc-shaped concave portion is formed at the tip of the convex mold, and the concave mold is formed. A convex portion corresponding to the concave portion is formed at the bottom of the groove, and a curved portion is formed at a peak portion and a valley portion of the corrugated fin when the corrugated fin is bent and formed. A heat exchanger characterized by suppressing the corrugated fin bending phenomenon. 2. A flat fin material is continuously supplied to form a fitting groove for fitting a tube in the fin material, and the fin material is bent into a corrugated shape using a pair of concave and convex dies. Forming a corrugated fin, and fitting the tube into the fitting groove of the folded corrugated fin to produce a heat exchanger. A concave portion is formed, a convex portion corresponding to the concave portion is formed at the groove bottom of the concave mold, and a bent portion is formed at a peak portion and a valley portion of the corrugated fin when the corrugated fin is bent and formed. A method of manufacturing a heat exchanger, wherein the bending portion is spring-backed to suppress a bending phenomenon of the corrugated fin.