JPH02269525A - Manufacture of plate fin coil for heat exchanger - Google Patents

Abstract

PURPOSE:To shorten pipe expanding hours and improve work efficiency by laminating formed fin plates, and inserting pipes through chain holes thereof, and expanding pipes from inside to fix them in the plate, and separating the fin plate to a required unit at notches. CONSTITUTION:A fin plate A is formed by cutting chain holes (a) in which pipes are inserted and notches bm, bn for separating the chain holes between lines m1-m8 in the longitudinal direction and step lines n1-n14 in the cross direction of the chain hole lines in an aluminium plate supplied by an automatic fin presser. The fin plates are laminated and pipes are inserted into the chain holes (a), and it is fitted to an expander, and the pipes are expanded to fix the fin plate A. A plate fin coil obtained by fitting the fin plate A in the pipes is separated to a required unit. A pipe expanding process by the expander which has been always a difficulty can be thus shortened.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention belongs to the field of heat exchangers for air conditioners, air conditioners, etc. The present invention relates to a method of manufacturing a plate fin coil.

(Prior Art) The manufacture of plate fin coils, in which radiation fins made of aluminum or the like are fixed to pipes made of copper or the like, used in heat exchangers for air conditioners, air conditioners, etc., is usually carried out through the following steps.

In other words, the fin plate material sent out by the automatic fin press is punched with the desired number of rows (number of rows of through holes in the length direction) and number of stages (number of rows of through holes in the width direction) for pipes. The punched fin plates are inserted through the guide rod through the through holes and stacked.

Once the desired number of fin plates have been stacked, they are pulled out from the guide rod while maintaining their condition, and a pipe of copper or other material cut to the desired length with a tube cutting machine is pushed through the through hole of the plate. Attach to the expander.

In the expander, the pipe is expanded by pushing an expansion rod into the pipe, and the fin plate is fixed.

As described above, when manufacturing a conventional plate fin coil in which heat dissipation fins are fixed to a pipe, a fin plate having a row of through holes of the required number of rows and stages is formed by pressing. A pipe is inserted into the through hole of the stacked fin plates, and the pipe is expanded from the inside to fix the fin plate, so even one row of plate fin coils can be used for 12 rows of plate fin coils. However, the tube expansion time using the expander remained the same, requiring one step. This is the same in the direction of the number of stages.

(Problems to be Solved by the Invention) In manufacturing the conventional plate-fin coil as described above, it takes a lot of time to expand the pipe using the expander, and the large size of the equipment requires space and equipment. This resulted in an extremely large burden on production.

The present invention was made as a result of various studies and examinations regarding these points, and since the number of plate fin coils to be manufactured is determined by the time taken to expand the pipe with an expander, it is possible to expand the pipe using a fixed location, equipment, and personnel. The aim is to significantly shorten time and increase work efficiency.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, after expanding a pipe into which a heat dissipation fin is inserted from the inside thereof using an expander and fixing the heat dissipation fin to the pipe,
A plurality of plate fin coils are manufactured at the same time by separating this from a cutting cut previously provided in the fin plate.

That is, its manufacture consists of the following steps.

■ A long fin plate has a longitudinal row of through holes through which the pipes are inserted, and separation cuts between each parallel row of the longitudinal rows of these through holes and between each row of widthwise rows. ■ A process of punching out a fin plate to form a fin plate; ■ A process of inserting a pipe into the through hole of this fin plate, expanding the pipe from the inside, and fixing it to the plate; This process consists of three steps, including the step of cutting the fin plate to which the pipe is fixed into the required units from the notch.

(Example) Hereinafter, specific means for carrying out the manufacturing method of the present invention will be explained with reference to the drawings.

The aluminum plate of the fin plate used in manufacturing the plate fin coil of the present invention has a thickness of 0.11 mm to 0.1 mm.
The copper pipe, which is long and coiled with a thickness of 35 mm, and through which air-conditioning medium flows, has a hole diameter of 3/8.
It is rolled in long lengths such as 1/2 inch, 578 inch, 374 inch, etc.

In order to manufacture a plate fin coil using the above-mentioned materials, the following steps are carried out. For the sake of explanation, the row of holes in the length direction is called a row, and the row of holes in the width direction is called a row. is called a dan.

■ On the aluminum plate fed out by the automatic fin press machine,
a step of forming a fin plate by punching through holes through which the pipes are inserted and cuts for separating the through holes between rows in the longitudinal direction and between rows in the width direction; The process of stacking the fin plate, inserting the pipe into the through hole, attaching it to the expander, expanding the pipe, and fixing the fin plate; It goes through a process of separating it into units.

Of the above steps, the fin plate formed in step (1) has, for example, 1 to 12 rows of through holes in the longitudinal direction,
In the case of tubules, there are up to 24 rows. Further, the number of rows in the width direction is continuous in the length direction and is not limited, but is usually up to 40 rows due to the limit of the expander.

The fin plate (A) shown in FIG. 1 has eight through holes (a) in longitudinal rows (m, ) to (m8) and widthwise rows (n,). 14 columns of ~(n, 4). Longitudinal rows (m, ) to (m8) of through holes (a)
A notch (for separating the fin plate (A)) between each row of rows and between each row of rows (n, ) to (n, , ) in the width direction.
bm) and (bn) are provided.

Connecting portions (1) of approximately 0.8 to 2.0 mm are provided in the cuts (b+n) and (bn) at intervals of approximately 50 mm.

The through hole (a) of the fin plate (A,) through which the pipe (B) is inserted is not just a through hole; when punching with an automatic fin press machine, the hole edge of the through hole (a) is Color (2
) is formed, and the tip of this collar (2) has a brim-like curl (4) parallel to the surface of the plate body (3).

The height of this collar (2) from the back surface of the plate body (3) to the surface of the curl (4) is 1.57 mm to 12 mm.

The height of this collar (2) becomes the distance between one fin (5) and the next fin (5) when the fin plate (A) is inserted and fixed into the pipe (B).

In addition, the plate for fins (A) is the plate body (3)
may be flat or wavy, and the positions of the through holes (a) may be staggered or parallel.

In the process of (2), the fin plate (A) formed by an automatic fin press machine is attached to the guide rod etc. with its through hole (a).
) are stacked one after another at intervals of the height of collar (2).

The fin plates (A) stacked in this way are removed from a guide rod or the like while maintaining their condition, and a pipe cut to a predetermined length with a tube cut machine (a) is inserted into the through hole (a). B) is inserted and attached to the expander in this state.

Here, by pushing the expansion rod into the pipe (B), the pipe (B) is expanded and the fin play 1-(
A) is fixed to the pipe (B) at a spacing of the height of the collar (2).

The process (2) is a feature of the present invention as well as the process (2). Here, the plate fin coil in which the fin plate (A) is fixed to the pipe (B) is inserted into the through hole (a). By cutting it as a desired unit at any position between each row (ml) to (mB) in the longitudinal direction or between each row row (n,) to (n,,) in the width direction, the sixth A plate-fin coil unit as shown in the figure is completed. As shown in Fig. 4 (a) and (b), the means for separating the unit in the step (2) is to make cuts (bm) between rows in the length direction or rows in the width direction. The pipe on both sides of the notch (bn) between (
B), for example, between columns in the longitudinal direction, (B1) and (
B2), between the rows in the width direction, (B3) and (B,
) and insert a metal rod (C) between the rows and press it in the (x1) direction, the connecting part (1) will break and the rows (m2) and (m3) will be separated. Between the rows (B6) and (B7) are separated, and between the rows (B6) and (B7) when they are sandwiched in the (x2) direction, they become a unit.

Furthermore, as shown in FIGS. 5(a) and 5(b), for example, when attempting to separate from the notch (bm) between the longitudinal rows (m3) and (m4), the pipe (B2) By pushing metal rods (d) into and (B5) and pulling them in opposite directions (X3) and (x4), it is separated from the row (town) and (river). .

(Effects of the Invention) When molding a plate for fins, the present invention provides a through hole with a collar for pipe insertion, as well as holes for separation between each row in the longitudinal direction and between each row in the width direction. A notch is made, a pipe is inserted through the through hole to expand the pipe, the pipe and the fin plate are fixed, and then the plate fin coil is separated from the required rows or rows to produce a unit plate fin coil. Because of this, compared to the conventional method where you have to insert a pipe through the fin plate and expand it with an expander each time to obtain the required unit, you can use the same expander once as in the conventional method. By expanding the tube, it is possible to manufacture units twice, three times, etc.

Therefore, in manufacturing plate fin coils, in the tube expansion process using an expander, which is always a bottleneck, compared to conventional unit parts, if the pipe can be divided into two equal parts, the time required is 172, compared to the conventional one, which is divided into three equal parts. If so, 1/3
It can be done in the required time, making it extremely efficient.

For example, if you expand 12 rows at one time and divide them equally into 1 row, the time required will be 1/12, which means that you can produce 12 times as much as before, and similarly divide it into 2 rows. Then 17
6, i.e. 6 times, 1/4 in the 3rd row, i.e. 4 times, 4
In a row, the time is 1/3, that is, 3 times, and in 6 rows, the time is 1/2, that is, twice, and the required time is extremely shortened, allowing for more efficient production.

By shortening manufacturing time in this way, the problem of the tube expansion process in the expander, which had been a bottleneck in the past, has been solved, making it possible to prevent an increase in equipment costs in this area and improving overall efficiency. can.

[Brief explanation of drawings]

Figure 1 is a plan view of the fin plate, Figure 2 is the same X-
Figure 3 is an enlarged cross-sectional view of the X gland;
A) is a plan view of the relationship between the screw and the pipe when the pipe is separated from the notch of the fin plate, (B) is its side view, and Fig. 5 (A) is a plan view of the relationship between the screw and the pipe when the pipe is separated using a metal rod. FIG. 4A is a plan view similar to FIG. 4A, FIG. 6B is a side view thereof, and FIG. 6 is a perspective view of the plate fin coil. Code A...Fin plate B...
・Pipe C......Thread rod D...Metal rod a...Through hole bm, bn...Cutting depth m1 to m8...Longitudinal direction Rows n1 to n14...Width direction step row 1...Connecting portion 2...Color 3...Plate body 4... Carl 5...Fin

Claims (1)

[Claims] A long fin plate has longitudinal rows of through holes through which pipes are inserted, and cutting cuts between each parallel row of the longitudinal rows of the through holes and between each row of rows in the width direction. A process of punching out a fin plate to form a fin plate, a process of stacking the fin plates and inserting a pipe into the through hole, expanding the pipe from the inside and fixing it to the plate, A method for manufacturing a plate fin coil for use in a heat exchanger, which comprises the step of separating a fin plate to which is fixed into the required unit body from a notch.