JPS5933830B2 - Heat exchanger manufacturing method - Google Patents

Description

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

<Prior Art> Conventionally, a heat exchanger has been proposed in which molded fins made of thin plate aluminum are wrapped and adhesively fixed around metal pipes such as copper or aluminum using an adhesive.

FIG. 1 is a sectional view of a heat exchanger manufactured by a conventional method. In this heat exchanger 1, a metal pipe 2 has a cross section U.
The shaped fins 3 are joined with an adhesive 5, and the adhesive 5 is applied to the surface of the metal pipe 2 in the exposed gap 4 of the metal pipe 2 between the formed fins 3. 2 is tightly sealed. 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 in a short period of time, and the molded fins easily peel off from the metal pipe surface, causing lifting, and vibrations and external forces cause the molded fins to rattle, resulting in insufficient heat exchange characteristics. It had the disadvantage of not being able to demonstrate its full potential. <eye
Therefore, in order to solve the above-mentioned drawbacks, the present invention has developed a heat-treated metal pipe made of a metal pipe made of copper, aluminum, etc., in which a molded fin made of thin aluminum sheet is bonded with an adhesive such as phenol, epoxy resin, or sticky resin. In the exchanger, a linear fixing material is continuously wound between the molded fins, and the fixing material is used to strengthen and connect the molded fins to the metal pipe, thereby eliminating the above-mentioned drawbacks. be.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to FIG. 2.

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 is such that the metal pipe 2 is A heat exchanger 1 is assembled by wrapping a U-shaped molded fin T formed from aluminum 6, and then continuously wrapping a linear fixing material 8 around the exposed gap 4, as shown in FIG. 2b.
form.

The linear fixing material 8 is a corrosion-resistant thin metal wire such as aluminum, piano wire, galvanized steel wire, or stainless steel wire of an appropriate thickness, or a plastic string such as polyester, nylon, polypropylene, or vegetable fiber. It consists of a fibrous string, and is coated with a phenolic or epoxy resin baking type adhesive evenly or excessively impregnated if it is made of fibrous material, and is done in parallel with the wrapping of the molded fin T. The fixing members 8 are alternately fitted into the exposed gaps 4.

Then, through a drying process of passing through a drying oven, the adhesive 9 applied or impregnated onto the fixing material 8 is dried and hardened, as shown in FIG. 2c, to join the metal pipe 2 and the molded fin 3.

As a result, a bonding area corresponding to the circumferential surface and thickness of the fixing material 8 is secured, preventing deterioration caused by the outside air environment and permeation of the adhesive layer film, and preventing peeling from the copper pipe 2 for a long period of time. can. In addition, the molded fins 3 can withstand external forces and vibrations well, and since the exposed gap 5 is supported by the fixing material 8, the molded fins 3 can withstand torsion and repeated forces in the axial direction. As a result, rust prevention is improved.
It can prevent electrolytic corrosion of copper and maintain good heat exchange characteristics for a long period of time. Note that as the adhesive 9, a rubber elastomer such as neoprene or nitrile rubber, which has good adhesion to copper, may be used. <Effects> By manufacturing a heat exchanger by the method of the present invention as described above, the metal pipe and the forming fins can be sufficiently bonded regardless of the winding speed of the forming fins around the metal pipe. The winding speed of the fins is increased, productivity is improved, and the bond between the metal pipe and the formed fins is further strengthened, making it possible to obtain a heat exchanger with excellent long-term durability.

[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 represents an exposed gap, 8 represents a fixing material, and 9 represents an adhesive.

Claims (1)

[Claims] 1 A linear fixation in which a formed fin made of thin aluminum sheet formed into a U-shaped cross section is wrapped around a metal pipe made of copper, aluminum, etc. with a gap left, and this gap is impregnated or coated with phenol or epoxy adhesive. 1. A method for manufacturing a heat exchanger, characterized in that the metal pipe and the molded fin are joined by continuously winding the fixing material and drying an adhesive impregnated or applied to the fixing material.