JPS5971993A - Manufacture of heat exchanger - Google Patents

Abstract

PURPOSE:To obtain a highly durable heat exchanger, by increasing the speed of molded-fin winding operation and raising the productivity by winding a wire-like fixing member continuously around a metal pipe to be located between adjacent two molded fins and fixing the molded fins firmly to the metal pipe by means of the fixing member. CONSTITUTION:A heat exchanger 1 is manufactured by winding U-shaped molded fins 7 made from a thin aluminum plate 6 around a metal pipe 2 continuously along with rotation of the same and also winding a wire-like fixing member 8 continuously around the metal pipe 2 to locate at gap portions 4 exposed to the outside. The wire-like fixing member 8 consists of aluminum wire, piano wire or fiber string having a proper diameter and it is applied or impregnated with a sufficient amount of an adhesive medium of the type obtained by baking a phenol or epoxy resin. Winding of the fixing member 8 is performed simultaneously with winding of the molded fins 7 and the fixing member 8 is fitted into the gap portions 4 alternately. After drying process, the adhesive medium 9 applied to or impregnated in the fixing member 8 is hardened through drying to fix the molded fins 3 to the metal pipe 2. By thus making a heat exchanger, it is enabled to prevent deterioration by the atmosphere, penetration of the layer of adhesive medium and separation of the same from the copper pipe 2. Further, it is enabled to improve rust-resisting properties and to prevent electrolytic corrosion of the copper.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method of 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 fixed by adhesive around a metal pipe made of copper, aluminum, or the like.

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 gap 4 where the metal vibrator 2 is exposed between the molded 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. The drawback was that it was not possible to demonstrate

<Purpose> Therefore, in order to eliminate the above-mentioned drawbacks, the present invention has been developed by bonding a molded fin made of thin aluminum plate to a metal pipe made of copper, aluminum, etc. using an adhesive such as phenol, epoxy resin, or sticky resin. In this heat exchanger, a linear fixing material is continuously wound between the molded fins, and the fixing material strengthens and connects the molded fins to the metal pipe, thereby eliminating the above-mentioned drawbacks. It is something.

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

FIG. 2 is a diagram showing the steps of the method for manufacturing a heat exchanger according to the present invention, and as shown in this diagram, the method of the present invention rotates the metal pipe 2 as shown in FIG. 2(a). At the same time, a U-shaped molded fin 7 formed from a thin aluminum plate 6 is wrapped, and a linear fixing material 8 is continuously wrapped around the exposed gap 4, as shown in Fig. 2 (1). A heat exchanger 1 is formed.

The linear fixing material 8 may be a thin corrosion-resistant metal wire such as aluminum, piano wire, galvanized steel wire, or stainless steel wire of appropriate thickness, or a plastic string such as polyester, nylon, polypropylene, or vegetable fiber. is made 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. 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. 2(c), and the metal pipe 2 and the molded fin 3 are joined together. 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 because 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, it is possible to improve rust prevention, prevent electrolytic corrosion of copper, and maintain good heat exchange characteristics for a long period of time.

<Effects> By manufacturing a heat exchanger by the method of the present invention as described in Section 2, the metal pipe and the formed fins can be sufficiently joined regardless of the winding speed of the formed fins around the metal pipe. As a result, the wrapping of the formed fins increases the work speed and productivity, 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. can.

[Brief explanation of drawings]

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, l 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 fixing material made by wrapping a formed fin made of thin aluminum plate with a U-shaped cross section around a metal pipe made of copper, aluminum, etc. with a gap, and impregnating or applying phenol or epoxy adhesive to this gap. 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.