JPS5819038B2 - How to make heat exchange tubes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Regarding heat exchange tubes, in order to increase the heat exchange efficiency, improvements have been made to the shape of the fins, and a large number of types have been proposed.

However, even if the heat exchange rate is high, if the fin shape is too complicated, the production process and production equipment become complicated, resulting in poor productivity and has not been put to practical use.

Plate fin type and spine fin type are known as typical types of heat exchange tubes that have been put into practical use.
In the former method, it was necessary to make the plate thin in order to increase the heat exchange efficiency, and to maintain the fin gap constant and close, resulting in somewhat low productivity and restrictions on free shaping of the tube.

Although the latter has improved heat exchange efficiency compared to the former, the fin processing process is complicated and the production equipment is therefore expensive.

The present inventor has already filed Japanese Patent Application No. 51-108531,
2-11871 and Japanese Patent Application No. 52-11872 proposed various needle-like fin heat exchange tubes, but these heat exchange tubes had drawbacks in terms of productivity and workability.

The present invention was proposed in order to solve the above-mentioned conventional drawbacks, and by pasting an adhesive tape on an aligned assembly of needle fins and then processing it, the production process is simple and the productivity is high. The purpose is to provide a manufacturing method.

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 to 5, 1 is a thin wire such as a round wire or square wire having high thermal conductivity such as aluminum or copper cut to a predetermined length. First, a large number of the thin wires 1 are arranged in parallel on one plane without gaps so that both ends are in a straight line, as shown in FIG.

Next, a single-sided or double-sided adhesive tape 2 whose width is shorter than the length of the thin wires 1 is placed at the center of the upper surface (center in the width direction) of a group of thin wires 1 arranged in parallel at right angles to the length direction of the thin wires 1. As shown in FIG. 2, pressure is applied sequentially from the ends to adhere the thin wire 1 to prevent the thin wire 1 from falling apart.

The material of the tape is preferably a metal material with high thermal conductivity such as aluminum or copper, but vinyl material may also be used.

Next, as shown in FIG. 3, a round or square support wire 3 is placed on the center of the adhesive tape 2 in the width direction, and then bent into a U-shape as shown in FIG. 4, with the support wire 3 at the center. , the pin group row 4 is manufactured so that both sides of the thin wire 1 are parallel to each other.

Next, as shown in FIG. 5, the pin group row 4 is spirally wound around the outer surface of a rotating tube 5 coated with adhesive while moving in the direction of the arrow to produce a heat exchange tube.

As explained in detail above, in the present invention, a single-sided or double-sided adhesive tape having a predetermined width is attached to the center of the width of a group of thin wires arranged in parallel without gaps, so that the thin wires are It is possible to maintain the parallel state of each thin wire in the group and prevent the thin wires from falling apart.

In addition, the support wire placed on the adhesive tape functions as a spacer to keep the bending radius of the U-shape, that is, the pin gap, constant when the thin wire group is bent into a U-shape, and also serves as a spacer to keep the pin gap constant. Reinforcement that prevents the adhesive tape from breaking when the row of pin groups is wound spirally around the outside of the tube at high speed, and also prevents the adhesive tape from breaking and thin wires falling out of the tube during use. effective.

In this way, in the present invention, each thin wire of the thin wire group is attached with adhesive tape so that it does not fall apart, so when forming a pin group row by bending it into a U shape, the pin group row is also attached to the outside surface of the tube. It is extremely easy to process when winding around the tube, which increases productivity and simplifies the production process, eliminating the need for expensive production equipment and making needle-shaped heat exchange tubes highly efficient. It also has the effect of being able to be produced at low cost.

[Brief explanation of drawings]

1, 2, and 3 sequentially show the implementation state of the method of the present invention, where A is a plan view, the opening is a side view, and C is a cross-sectional view of A to A1B-B and CC, respectively. , Fig. 4A is a side view of the pin group array obtained by the method of the present invention, Fig. 4 is a cross-sectional view taken along line D-D of the same pin group array, and Fig. 5 is a heat exchange tube manufactured using the same pin group array. FIG. Explanation of the main parts of the diagram, 1...Thin lines, 2...
...Adhesive tape, 3...Support wire, 4...
・Pin group row, 5...tube.

Claims (1)

[Claims] 1 A large number of thin wires such as round or square wires made of aluminum, copper, etc. with high thermal conductivity formed to a predetermined length are arranged in parallel on one plane without gaps so that the predetermined length is the width. After that, attach a single-sided or double-sided adhesive tape with a specified width to the center of the width, then place a support line such as a round or square wire on top of the tape, and place the support line at the center. After bending the thin wire group into a U-shape to form a pin group row,
A method of manufacturing a heat exchange tube characterized by winding the same pin group array in a spiral around the tube outer surface.