JPS5931677B2 - Heat exchanger manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a heat exchanger used in an air conditioner or the like.

Conventionally, a heat exchanger has been proposed in which molded fins made of thin aluminum sheets are wrapped around metal pipes of copper, aluminum, etc. using an adhesive and fixed with adhesive.

FIG. 1 is a cross-sectional view of a heat exchanger manufactured by this conventional method, in which molded fins 3 having a U-shaped cross section are bonded to metal pipes 2 with an adhesive 5. At the same time, an adhesive 4 is applied to the surface of the metal pipe 2 in the exposed gap 4 of the metal pipe 2 between the forming fins 3 and 3 to seal the forming fin 3 to the metal pipe 2. However, in the heat exchanger 1 having such a structure, it is not possible to make the thickness of the adhesive 5 more than 20μ due to the manufacturing process, so although it has sufficient strength during processing, it cannot be used in actual use when set in an air conditioner etc. When exposed to the environment, the adhesive deteriorates after a short period of time, and the molded fins easily peel off from the metal pipe surface, causing raised wrinkles, and vibrations and external forces cause the molded fins to rattle, preventing sufficient heat exchange. The drawback was that it could not demonstrate its characteristics. Therefore, in order to eliminate the above-mentioned drawbacks, the present invention provides a heat exchanger of this type in which a linear fixing material is continuously wound between the molded fins, and the molded fins are strengthened and bonded to the metal pipe by the fixing material. This is an attempt to eliminate the above-mentioned drawbacks.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIG.

FIG. 2 is a drawing showing the steps of the method for manufacturing a heat exchanger according to the present invention, and as shown in this drawing, the method of the present invention includes:
First, as the metal pipe 2 rotates, as shown in FIG. The molded fin 3 is strengthened and bonded to the metal pipe 2 by continuously wrapping the fixing material 8 in the shape of the shape, and heating the fixing material 8 as shown in FIG. 2b to melt and fix the fixing material 8.

More specifically, a bonding material such as aluminum solder, aluminum high-temperature solder, or low-Si aluminum solder for bonding aluminum and copper is used as the fixing material 8, and a wire of an appropriate thickness is used, for example, a gap between the molded fins 3 and the molded fins 3. If the wire is 1.6n, use a wire with a diameter of 1.6φ and wrap it around the exposed gap 4 as described above, and then pass it through a furnace such as a non-oxidizing atmosphere furnace as a fixing material made of aluminum solder or aluminum solder. 8 is melted to join the molded fin 3 to the copper pipe 2 and cover the exposed gap 4 of the pipe. In addition, as the fixing material 8, 5n (50-52)-Pb
(28-30)-Zn (remainder) aluminum solder with working temperature of 200°C-350°C, Cu (3.4-4.5)-
Al(3.8-4.8)-Mn(<0,a,)-Mg(
0.15)-Zn (residue) aluminum high temperature solder,
Si(4-6)-Cu(<0.3)-Fe(ku0.8)
A bonding material wire such as -Zn(0.1)-A1(remainder) low-Si aluminum solder is suitable.

By manufacturing a heat exchanger by the method described above, 1
Regardless of the speed at which the forming fins are wrapped around the metal pipe,
Since the metal pipe and the forming fin can be sufficiently bonded, the winding work speed of the forming fin is increased, productivity is improved, and the bonding condition of the forming fin of the metal pipe is further strengthened, resulting in long-term durability. An excellent heat exchanger can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a heat exchanger manufactured by a conventional method, and FIG. 2 is a process explanatory diagram of a method for manufacturing a heat exchanger according to the present invention. In addition, 1 is a heat exchanger, 2 is a metal pipe, 3 is a molded fin,
4 is an exposed gap, and 8 is a fixing member.

Claims (1)

[Claims] 1 Wrap a molded fin formed into a U-shape with a gap around a metal pipe, wrap a heat-melting linear fixing material around the gap, heat-treat it to melt the fixing material, and fix the metal. A method for manufacturing a heat exchanger characterized by joining pipes and molded fins.