JPH10193014A - Welded tube for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the man-hour as much as possible, and to improve the heat transfer efficiency by forming an integrated tubular body and an inner fin by roll-forming an aluminum plate on the surface of which a brazing filler metal is cladded. SOLUTION: A corrugated inner fin 2 is formed in a tubular body 3 by roll- forming an aluminum plate 1 on the surface of which a brazing filler metal is cladded so that the inner fin 2 is brought into contact with an inner wall 4 of the tubular body 3. The inner fin is fixed to a jig, and heated in a heating furnace, and a welded tube for a heat exchanger is formed by brazing a part to be joined. The tube can be formed into a variety kinds of sectional shape. The aluminum plate 1 is formed into the corrugated inner fin and the tubular body, and the inner fin is abutted on the inner wall of the tubular body, and formed, and heated in the furnace to braze the part to be joined. Roll-forming is performed by passing the aluminum plate between upper and lower rolls, and forming a bent piece on each side of the aluminum plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a welding tube for a heat exchanger such as an intercooler, a radiator, a condenser, and an evaporator.

[0002]

2. Description of the Related Art As a conventional technique of this kind, the one shown in FIG. 23 is generally used. A corrugated inner fin 102 is inserted into the flat tube 101 using a machine, fixed to a jig, heated in a heating furnace, and brazed at a portion to be joined to form a tube.

[0003]

As described above, when the inner fin 102 is inserted into the flat tube 101 by using a machine, the number of processing steps is increased, and the cost cannot be reduced by a certain amount or more. Further, when the inner fin 102 is fitted inside the flat tube 101 and heated and joined in a heating furnace to braze the flat tube 101 and the inner fin 1,
02 is not always sufficiently bonded, and the heat conductivity is not always sufficient.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has been made to reduce the number of processing steps as much as possible, reduce costs, and further improve heat conduction efficiency.
A heat exchanger tube in which an inner fin is interposed in a tube, wherein the tube and the inner fin are formed integrally by roll homing from an aluminum plate material with a brazing material clad on the surface. It was a dexterous welding tube.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on specific embodiments shown in the accompanying drawings. As shown in FIG. 1, an aluminum plate material 1 having a brazing material clad on its surface is roll-homed to form a wavy inner fin 2 in a tube 3 so that the inner fin 2 contacts an inner wall 4 of the tube 3. It is formed, fixed to a jig, heated in a heating furnace, and brazed at a portion to be joined to form a tube.

Also, as shown in FIG. 2, for example, as shown in FIG. 2, an aluminum plate material 1 is formed on a corrugated inner fin 2 and a tube 3, and the inner fin 2 is formed.
Is formed in contact with the inner wall 4 of the tubular body 3, and the tube is formed by brazing the portion to be joined by heating in a furnace as in FIG. 1. Next, the manufacturing process of the present invention by roll homing of the tube shown in FIG. 1 will be described in detail with reference to FIGS.

In FIG. 3, a lower roll 12 is
Are fixed by screws 13, and the upper roll 1
5 is fixed by screws 16. The aluminum plate 1 passes between the lower roll 12 and the upper roll 15,
The aluminum plate 1 is bent at 45 ° on both sides to form bent pieces 17 and 18 respectively. In FIG.
The bent pieces 17 and 18 on both sides of the aluminum plate 1 between the lower roll 19 and the upper roll 15 are formed at right angles.

In FIG. 5, the bent piece 17 is formed so as to be inclined slightly inward between the outer roll 20 and the inner roll 21. This is to minimize the bending R at the base of the bending piece 17. In FIG. 6, the bent piece 18 of the aluminum plate 1 is also formed to be slightly inclined inward by the outer roll 22 and the inner roll 23 in the same manner as described above.

In FIG. 7, an outer roll 25 and an inner roll 26 are formed so that the upper end of the bent piece 17 of the aluminum plate 1 becomes a stepped flange 24.
Subsequently, in FIG. 8, the bent piece 18 of the aluminum plate material 1 has the upper end portion having the stepped flange 2 in the same manner as described above.
7 is formed by the outer roll 28 and the inner roll 29.

In FIG. 9, a lower roll 31 and an upper roll 32 are arranged such that the stepped flanges 24 and 27 are located outside at the bases 29 and 30 of the stepped flanges 24 and 27 of the bent pieces 17 and 18 of the aluminum plate 1. Is formed. In FIG. 10, the lower roll 35 and the upper roll 36 are formed so that the upper end pieces 33 and 34 of the stepped flanges 24 and 27 of the aluminum plate 1 face upward.

In FIG. 11, an outer roll 36 and an inner roll 37 are formed such that the base 29 of the bent piece 17 of the aluminum plate 1 is located inside and the oblique piece 35 is below the base 29. In FIG. 12, the base 30 of the bent piece 18 of the aluminum plate 1 is positioned inside,
The outer roll 3 is positioned so that the oblique section 38 is formed below the base 30.
9 and the inner roll 40.

Referring to FIG. 13, an outer roll 41 and an inner roll 42 are formed so that a slant 35 of a bent piece 17 of an aluminum plate 1 is horizontal. As shown in FIG. 14, the outer plate 43 is formed by the outer roll 43 and the inner roll 44 so that the oblique piece 38 of the bent piece 18 of the aluminum plate 1 is horizontal. Next, in FIG. 15, the lower rolls 46 and the upper rolls 17 and 18 are bent so that the bent pieces 17 and 18 of the aluminum plate material 1 are bent and overlap the two ends of the base piece 45 with the tips of the upper pieces 33 and 34 and the bases 29 and 30. It is formed by a roll 47.

In FIG. 16, an outer roll 48 and an inner roll 49 are formed on the base side of the bent piece 17 of the aluminum plate 1 so that the inclined piece 35, the base 29, and the upper end piece 35 are shifted. In FIG. 17, the oblique piece 38, the base 30, and the upper end piece 3 of the bent piece 18 of the aluminum plate 1 are shown.
4 so that the outer roll 50 moves toward the base side of the bent piece 18.
And the inner roll 51.

In FIG. 18, the outside of the base piece 45 of the aluminum plate 1 is bent at 45 ° to form the folded pieces 54.5.
5 is formed by a lower roll 52 and an upper roll 53. FIG.
In 9, the folded piece 54 of the folded pieces 54, 55 on both sides of the base piece 45 of the aluminum plate 1 is formed into a right angle by the lower roll 56 and the upper roll 57.

Next, in FIG. 20, the folded piece 55 of the aluminum plate 1 is
At 9 a right angle is formed. In FIG. 21, the folding pieces 54 and 55 of the aluminum plate 1 are formed by the side rolls 60 so as to be inclined 45 ° inward. FIG.
In the above, the folding pieces 54 and 55 formed at 45 ° of the aluminum plate 1 are attached to the lower roll 61 and the upper roll 6.
At 2, the base piece 45 is pressed.

Thus, the tube shown in FIG. 1 is formed. The tube is fixed to a jig, carried into a heating furnace, heated in the heating furnace, and brazed at a portion to be joined to form a tube.

[0017]

As described above, the present invention relates to a heat exchanger tube in which an inner fin is interposed in a tube, and is an integrated aluminum plate material whose surface is clad with a brazing material by roll homing. Since it is a welded tube for heat exchangers that forms a tube body and inner fins, the number of processing steps is reduced as much as possible, cost is reduced, heat conduction efficiency is further improved, and quality is improved. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of a tube according to an embodiment of the present invention.

FIG. 2 is a sectional view of a tube according to another embodiment of the present invention.

FIG. 3 is a view showing a manufacturing process of the tube of the present invention, and is a cross-sectional view in a state where bent pieces are raised 45 ° on both sides of an aluminum plate material.

FIG. 4 is a cross-sectional view of a state in which bent pieces of an aluminum plate material are formed in a right angle.

FIG. 5 is a sectional view showing a state in which a bent piece of an aluminum plate material is slightly bent inward.

FIG. 6 is a cross-sectional view showing a state where the other bent piece of the aluminum plate material is slightly bent inward.

FIG. 7 is a sectional view showing a state in which an upper end of one bent piece of an aluminum plate material is formed in a step-like flange.

FIG. 8 is a cross-sectional view showing a state in which the upper end of the other bent piece of the aluminum plate is formed in a stepped flange.

FIG. 9 is a cross-sectional view of a state in which the stepped flange is formed so as to be located outside at the base of the stepped flange of the bent piece of the aluminum plate.

FIG. 10 is a sectional view showing a state in which an upper end piece of a stepped flange made of an aluminum plate material is formed so as to face upward.

FIG. 11 is a cross-sectional view showing a state in which the base of one of the bent pieces of the aluminum plate is located inside and the lower part of the bent piece is oblique.

FIG. 12 is a cross-sectional view of a state in which the base of the other bent piece of the aluminum plate material is located inside, and the lower part of the base is formed to be oblique.

FIG. 13 is a cross-sectional view showing a state in which an oblique piece of one bent piece of the aluminum plate material is formed to be horizontal.

FIG. 14 is a cross-sectional view showing a state where the other bent piece of the aluminum plate is formed so that the oblique side thereof is horizontal.

FIG. 15 is a cross-sectional view of a state in which a bent piece of an aluminum plate material is formed such that the ends and the base of both ends of the base piece are bent and overlap and abut.

FIG. 16 is a cross-sectional view of a state in which an oblique piece, a base, and an upper end piece are formed on the base end side of one bent piece of the aluminum plate material.

FIG. 17 is a cross-sectional view showing a state in which the oblique, base, and upper end pieces of the other bent piece of the aluminum plate material are formed so as to be closer to the base side of the bent piece.

FIG. 18: Both sides of a base plate made of aluminum plate material are 45 °
It is sectional drawing of the state formed in the folded and folded piece.

FIG. 19 is a cross-sectional view showing a state in which one folding piece of an aluminum plate material is bent at a right angle.

FIG. 20 is a cross-sectional view of a state in which the other folded piece of the aluminum plate is formed in a right angle.

FIG. 21 is a cross-sectional view of a state in which both folded pieces of an aluminum plate are formed so as to be inclined 45 ° inward.

FIG. 22 is a cross-sectional view of a state in which a folding piece formed at 45 ° of an aluminum plate material is folded and pressed against a base piece.

FIG. 23 is a sectional view of a conventional welding tube for a heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Aluminum plate material 2 ... Inner fin 3 ... Tube 4 ... Inner wall 17.18 ... Bent piece 24.27 ... Stepped flange 29.30 ... Base part 33.34 ... Top piece 35.38 ... Sloped piece 45 ... Base piece 54 ・ 55… Folding piece

Claims (1)

[Claims] 1. A tube for a heat exchanger having an inner fin interposed in a tube, wherein the tube and the inner fin are formed integrally by roll homing from an aluminum plate material having a brazing material clad on a surface thereof. Welded tube for heat exchanger.