JPH02309195A - Heat exchanger and manufacture thereof - Google Patents

Abstract

PURPOSE:To make a fin difficult to bend and to increase an area by a method wherein a number of holes through which a pipe is inserted and a number of lines of protrusion formed between the holes and in parallel to each other are formed in each of fins arranged with distance therebetween. CONSTITUTION:A title heat exchanger is formed with a number of plateform fins 2 made of a metal aligned with a distance therebetween, a pair of pipe plates 3 and 3 made of a metal on both sides, and a number of pipes 4 made of a metal extending through the fins 2 and the pipe plates 3 and 3 at right angles. The fin 2 is formed of thin aluminum in a square, and a number of holes 5 aligned obliquely at equal intervals and a cylinder part protruded in one-way from the peripheral edge of the hole is formed, and lines 7 of slender protrusion are formed in parallel to each other between the holes 5 and protrud ed in a reverse direction to the cylinder part 6. This constitution causes the line 7 of protrusion formed on each fin 2 to work as a reinforcing line and enables the increase of the area of the fin 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a plate-fin type or cross-fin type heat exchanger and a method for manufacturing the same.

2. Description of the Related Art In general, a plate fin or cross fin type heat exchanger is composed of a large number of thin plate-shaped fins made of aluminum and a large number of copper pipes that penetrate orthogonally through each of the fins.

In the manufacture of such heat exchangers,
As shown in Publication No. 13, a hole slightly larger than the outside diameter of the pipe is made in the center of the fin, and after passing the pipe through the hole, a tube expansion head is passed through the pipe to expand the pipe.
The method used is to bring the fins and pipe into close contact.

(c) Problems to be Solved by the Invention In the above conventional technology, since the fins themselves are flat, they are easily bent. Therefore, it is not possible to reduce the thickness of the fins to reduce the weight and cost of the heat exchanger. This is difficult, and in the manufacturing method, when inserting a pipe into the hole in the fin, the diameter of the hole is slightly larger than the outside diameter of the pipe, so the pipe passes through the first fin and then into the second fin. ,3
When the pipe reaches the second fin, the pipe is tilted and a part of the pipe is caught on the periphery of the hole. If you force the pipe, the periphery of the hole becomes dented or bent, which is a so-called bending phenomenon, which causes the fin to bend. There was a problem that the shape was deformed and the pitch between the fins could not be maintained at a predetermined pitch, resulting in poor airflow.

The present invention aims to solve the above problems.

(d) Means for Solving the Problems In order to solve the above problems, the present invention consists of a number of fins arranged at intervals from each other and a number of pipes perpendicular to each of the fins. , each of the fins has a number of holes through which the pipe passes, and a number of mutually parallel protrusions formed between the holes, and a number of grooves for receiving the edges of the fins. After arranging a large number of holes through which the pipes pass and a large number of plate-shaped fins each having a large number of mutually parallel elongated protrusions formed between the holes, in a box jig in which a A manufacturing method was adopted in which a pipe was passed through the holes in each of the fins, and then a tube expansion head was passed through the pipe to tightly seal each fin and the pipe.

(*) Effect According to the above means, the protrusions formed on each fin in the configuration not only act as reinforcing strips, but also serve to widen the area of the fins.

In addition, in the manufacturing method, when passing the pipe through each fin arranged on the box jig, if part of the pipe gets caught on the periphery of the second or third hole of the fin, the protrusion may Acts as a reinforcing strip.

(f) Example The present invention will be described in detail below based on the drawings.

(1) shown in Figure 3 is a plate fin or cross fin type heat exchanger used as an evaporator or condenser in refrigerators, air conditioners, low-temperature showcases, etc. It is a plate fin or cross fin type heat exchanger that is made of many metal sheets aligned at intervals. A plate-shaped fin (2), a pair of left and right metal tube sheets (3) (3), and a large number of metal pipes ( 4).

The fin (2) is made of rectangular thin aluminum, and has a large number of holes (5) arranged diagonally at equal intervals as shown in FIGS. The cylindrical portion (6) projecting in the direction has been completely formed, and the aligned number holes (5) are in a mutually parallel relationship, and the cylindrical portion (6) has been formed.
An elongated protrusion (7) is formed that protrudes in the opposite direction to 6). The cylindrical portion (6>) is formed by a well-known burring process, and the protrusions (7) are formed by a well-known press process, and both processes are carried out at the same time.

Next, a method for manufacturing the heat exchanger (1) will be explained.

(10) shown in Fig. 4 is a box-shaped box jig, with fins
2) and the tube plate (3) A number of U-shaped grooves <11) are formed to receive the edges of the tube plate (3). First, the fins (2) are arranged on a box jig 10) and aligned at equal intervals. Next, each fin (2)
Insert a pipe (with an outer diameter slightly smaller than the diameter of the hole) into the hole (5).
4), as shown in Fig. 5, a diffusion head (12) whose outer diameter is slightly larger than the inner diameter of the pipe (4) is passed through the pipe (4) to connect the pipe and the fins (2). A heat exchanger (1) is obtained by closely contacting them.

According to the configuration of the heat exchanger (1), the protrusions (7) formed on each fin (2) not only act as reinforcing strips, but also serve to widen the area of the fif 2). As a result, the fins (2) become difficult to bend, so the thickness of the fins (2) themselves can be made thinner, and the heat transfer area of the fins (2) increases, increasing the amount of heat exchange.

Further, according to the method for manufacturing the heat exchanger (1), a box jig (
10) When passing the pipe (4) through each fin (2) arranged in the fins (2), one of the pipes (4) If the fin (2) gets caught, the protrusion (7) acts as a reinforcing strip, which improves the strength of the periphery of the hole (5), making it difficult for the fin (2) to buckle. The material does not come out of the groove (11) of the jig (10).

(g) Effects of the invention The present invention described above produces the following effects.

■In addition to the ridges formed on each fin that act as reinforcing strips, they also serve to expand the area of the fin, making it difficult for the fin to bend. The weight of the exchanger can be reduced, and the heat transfer area of the fins increases, increasing the amount of heat exchange.

■If part of the pipe gets caught on the periphery of the second or third hole of the fin when passing the pipe through, the strength of the hole periphery will be improved because the protrusions act as reinforcing strips. Because of this, bending is less likely to occur, and the fins do not come out of the grooves of the box jig, allowing the pipe to be inserted.
Manufacturing work can be carried out smoothly.

[Brief explanation of drawings]

The drawings all show embodiments of the present invention; Fig. 1 is a vertical sectional view of the main part of the heat exchanger, Fig. 2 is a side view of the fins, Fig. 3 is an overall perspective view, and Fig. 4 is a box jig. FIG. 5 is a partially cutaway perspective view and a vertical cross-sectional view showing the tube expansion process. (2)...Fin, (4)...Pipe, (5)...
・Hole, <7)... protrusion, (10)... box jig,
(11)... Groove, (12)... Tube expansion head.

Claims (1)

[Claims] 1. A large number of fins arranged at intervals,
It consists of a large number of pipes perpendicular to each of the fins, and each fin is provided with a large number of holes through which the pipes pass, and a large number of mutually parallel protrusions formed between the holes. Heat exchanger. 2. A box jig in which a number of grooves for receiving the edges of the fins are formed, and a number of holes through which the pipes pass, and a number of mutually parallel long slender protrusions formed between the holes. A method of manufacturing a heat exchanger, which comprises arranging a plurality of plate-like fins, passing a pipe through the holes of each fin, and then passing a tube expansion head into the pipe to bring each fin and the pipe into close contact with each other.