JPH07127984A - Parallel flow type heat exchanger and its manufacturing method - Google Patents

Abstract

PURPOSE:To prevent deformation of a front shape after brazing operation and deformation of a heat exchanger and then to improve its outer appearance by a method wherein some normal corrugated fins and some inverted corrugated fins are alternatively arranged between regulated flat tubes. CONSTITUTION:Some corrugated fins 4 and 5 arranged between flat tubes 6 in a heat exchanger are installed in such an orientation that residual stresses are eliminated from each other. That is orientations of the corrugated fins 4 and 5 which are adjacent to each other through the flat tubes 6 are symmetrically arranged against a line (x) in such a way that top portions of the corrugated fins 4, 5 and bottom portions of the corrugated fins 4, 5 are overlapped from each other. Assembling of the corrugated fins 4, 5 is carried out such that the normal corrugated fins 4 cut to their predetermined length and formed to be directed as they are and the inverted corrugated fins 5 directed by rotating the corrugated fins 4 similarly formed in a lateral direction by 180 deg. are regularly and alternatively arranged. Due to this fact, it is possible to prevent deformation of a front shape of the heat exchanger and occurrence of cracks at a brazing part when an integral brazing under heating operation is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel flow heat exchanger in which header tanks are provided at both ends of a plurality of laminated tubes and a method for manufacturing the same.

[0002]

2. Description of the Related Art In a parallel flow type heat exchanger, a plurality of tubes are laminated in parallel with each other via corrugated fins, and header tanks are connected to both ends of these tubes. The header tank is provided with an inlet / outlet pipe, and a partition plate is provided at a required location in the header tank.The heat exchange medium passes through the tubes while meandering a plurality of tubes multiple times as one unit path. Shed

Further, when manufacturing a parallel flow type heat exchanger, tubes, fins, header tanks,
The side plate and each component such as the outlet pipe and the inlet pipe are manufactured separately. For example, the tube is formed by extruding an aluminum member and cut into a predetermined length. The wavy fins are formed of aluminum alloy into a thin plate shape, and are formed by a forming gear with a predetermined number of peaks and a predetermined pitch. The header tank is formed by pressing an aluminum alloy member.

At the time of assembly, for example, a predetermined number of tubes and side plates are aligned in a jig in the width direction, and wavy fins are pressed from above between the aligned tubes to form strip-shaped treatments on the side plates on both sides. Attach the tool and perform main compression, and insert the header tanks at both ends of the side plate and tube in this state. Next, while the side plates on both ends are clamped by the in-furnace jig, fluorine-based flux is applied and dried, and they are brazed together by heating in the furnace.After cooling, the jig is removed to obtain a heat exchanger. (For example, JP-A-62-207572 and JP-A-62-172).
78731, JP-A-2-172637).

[0005]

However, in the above conventional parallel flow type heat exchanger, as shown in FIG.
As shown in 0, since the wavy fins 4 interposed between the tubes 6 were inserted and assembled in the same direction, a slight pressure was applied in the stacking direction by the jig in the furnace during the heating brazing. When integrally brazed, due to the residual stress of the wavy fins, as shown in FIG. 11, the front shape of the heat exchanger 1 is distorted like a solid line where the two-dot chain line in the figure is distorted, and both diagonal lines A In some cases, there was a problem that B and B were significantly different.

That is, the wavy fin is generally formed by processing a cold-rolled roll material with a pair of fin forming gears.
The fin forming gear makes the left and right tilt angles centered on the mountain uniform, but the residual stress during fin forming remains in the wavy fin in a specific direction, and this residual stress of the component parts during brazing is used. The front shape may be deformed after brazing due to softening. As a result, not only the appearance of the product is bad, but also the bracket and its mounting position are significantly displaced, resulting in improper mounting. In this case, there is a risk that the heat exchange medium may leak.

Therefore, the present invention prevents the deformation of the front shape after brazing, and eliminates the appearance of the heat exchanger, the displacement of the mounting position of the bracket, and the cracking of the brazing portion, and the manufacturing thereof. It is intended to provide a way.

[0008]

A heat exchanger according to a first aspect of the present invention is a tube in which tubes arranged in parallel with each other and corrugated fins interposed between these tubes are laminated and arranged. In a parallel flow heat exchanger in which header tanks are communicatively connected to both ends of the wavy fins, the wavy fins are normal wavy fins along the fin forming transfer direction, and wavy fins that are inverted with respect to the normal wavy fins. Therefore, it is arranged regularly.

According to the second aspect of the method for manufacturing a heat exchanger, a tube cut into a predetermined length, a wavy fin formed by a forming gear and cut into a predetermined number of pitches and a predetermined pitch, and other members such as a header tank. After aligning a plurality of tubes in an automatic assembly machine, the corrugated fins are interposed between the tubes adjacent to each other, the header tanks are attached to both ends of the tubes, and the tubes are clamped and heated by a jig in the furnace. A method for manufacturing a parallel flow heat exchanger that integrally brazes by means of a method, wherein, when a corrugated fin is interposed between the tubes, a normal corrugated fin along a fin forming transfer direction and a normal corrugated fin are provided. On the other hand, the inverted wavy fins that have been inverted are transferred separately to the automatic assembly machine, and both wavy fins are regularly arranged.

[0010]

Therefore, between the tubes, the normal wavy fins along the fin forming transfer direction and the inverted wavy fins that are the reverse of the normal wavy fins are regularly and alternately arranged. The stresses remaining in the wavy fins during the forming process of the wavy fins are arranged so as to cancel each other out, and deformation of the front shape of the heat exchanger during integral brazing due to heating is prevented. As a result, the bracket and the mounting portion thereof are not displaced from each other, and it is possible to prevent cracks in the brazing portion and leakage of the heat exchange medium from the crack portion due to the excessive mounting.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a heat exchanger (condenser) 1 of this embodiment.
2 shows an inlet side header tank and 3 shows an outlet side header tank.

Between the two header tanks 2 and 3, there are interposed flat tubes 6 alternately stacked with the corrugated fins 4 and 5 in parallel with each other, and both ends of each flat tube 6 are located in both header tanks 2. , 3 are connected for communication. The upper and lower ends of the header tanks 2 and 3 are closed by blind caps 7, and side plates 8 having a U-shaped cross section are arranged on the upper end side and the lower end side of the laminated flat tubes 6. One header tank 2 has a heat exchange medium inlet joint 9
Is attached to the other header tank 3 and the outlet joint 10
Is installed.

Further, between the inlet joint 9 and the outlet joint 10, the header tanks 2 of both sides are arranged so that the heat exchange medium flows through the plurality of flat tubes 6 which are gathered together by reversing the flowing direction a plurality of times. A partition plate 11 is provided in each of the three. In this embodiment, the partition plate 11 is provided so that the heat exchange medium has five passes in which it is inverted four times.

Further, in the heat exchanger 1 of the present embodiment, the corrugated fins 4 and 5 provided between the side plate 8 and the flat tubes 6 and between the flat tubes 6 are arranged so as to cancel the residual stress with each other. There is. That is, as shown in FIG. 2, the direction of the wavy fins 4 and 5 adjacent to each other via the flat tube 6 is such that the peaks and crests and the troughs and valleys of the wavy fins 4 and 5 overlap in the vertical direction when viewed from the front. Thus, they are arranged symmetrically with respect to the line x. Further, as shown in FIG. 3, the assembling of the wavy fins 4 and 5 is performed in the present embodiment.
A normal wavy fin 4 which is formed by cutting it to a predetermined length and is sent out from a fin forming gear 17, which will be described later, and a wavy fin 4 which is similarly formed are laterally moved 180 degrees.
It has a configuration in which wavy fins 5 each having an inverted direction of rotation are alternately arranged regularly.

Next, a case where the heat exchanger 1 having the above structure is manufactured by automation will be described.

The flat tube 6 is formed into a flat shape having an internal flow path by extruding an aluminum material and wound around a roll. Then, in order to obtain the flat tube 6 of a predetermined length, as shown in FIG. 4, the flat tube material 13 is pulled out from the roll 12 and cut into a predetermined length by a cutter 14,
The flat tube 6 having a predetermined length thus formed is transferred.

Further, the side plate 8 is also cut into a predetermined length, is pressed into a U-shaped cross section, and is transferred.

As shown in FIG. 5, the corrugated fins 4 and 5 are formed into a corrugated shape having a predetermined shape by pulling out the material 16 wound on a roll 15 and using a pair of molding gears 17 in the forming process. The formed material 16 is cut with a blade 18 in a cutting process with a predetermined wave number and a uniform pitch, and the wavy fins 4 having a predetermined pitch and a predetermined wave number are obtained. The wavy fins 4 thus obtained are transferred to the reversing unit 19
In the normal wavy fin 4 which is conveyed at the time of molding
And the inverted wavy fins 5 which are laterally turned 180 degrees and transferred. Therefore, the normal wavy fins 4 and the inverted wavy fins 5 are turned upside down.

The header tanks 2 and 3, the blind cap 7, the inlet joint 9, the outlet joint 10, and the partition plate 11 are also molded and transferred. As the header tanks 2 and 3, in the present embodiment, as shown in FIG. 6, the header tanks 2 and 3 including a tank plate 21 and an end plate 22 which are divided into two in the radial direction are used. Incidentally, in FIG. 6, 2
Reference numeral 3 indicates a tube insertion hole.

Then, each member is fed to the automatic assembly machine of the heat exchanger 1. In the assembling machine, first, the plurality of flat tubes 6 and the side plates 8 on both sides are aligned with the width direction vertically, and the wavy fins 4 and 5 are sequentially inserted between them. In this case, the normal wavy fin 4 described above
And the inverted wavy fins 5 are regularly arranged, for example, alternately. After that, the insertion holes 23 of the tank plates 21 of the header tanks 2 and 3 are inserted into both ends of the aligned flat tubes 6, the end plates 22 of the header tanks 2 and 3 are attached to the tank plate 21, and the header tanks 2 and 3 are attached. The blind cap 7 is attached and clamped by the jig in the furnace.

The assembled heat exchanger 1 clamped by the in-furnace jig is obtained by removing the in-furnace jig by applying a fluorine-based flux, drying it, and then heating and cooling for a predetermined time. After that, the inlet and outlet pipes 9 and 10 are attached to the header tanks 2 and 3 by torch brazing or the like.

As described above, in this embodiment, the normal wavy fins and the inverted wavy fins are alternately arranged between the aligned flat tubes, so that the wavy fins themselves can be formed during the wavy forming. Since the residual stresses in the heat exchanger are arranged so as to cancel each other out, when the brazing is performed by heating, the residual stress of the wavy fin acts in one direction and the front shape of the heat exchanger is distorted. Therefore, the appearance of the product can be secured. As a result, the bracket of the heat exchanger and the mounting portion will not be displaced, and since it is not necessary to forcibly mount it, cracks will not occur in the brazing portion, and leakage of the heat exchange medium from the cracks will be eliminated. .

In the present embodiment, as shown in FIG. 3, the inverted wavy fins 5 are laterally rotated 180 degrees with respect to the normal wavy fins 4, but the invention is not limited to this. For example, as shown in FIG. 7, the vertical direction and the front and rear ends may be inverted with the transfer direction end m of the normal wavy fin 4 as the base axis. Further, as shown in FIG. 8, the front and rear ends a and b may be interchanged with the top and bottom as it is with the line n as the center.

Further, in this embodiment, the normal wavy fin 4 is used.
And the inverted wavy fins 5 are alternately arranged adjacent to each other, the present invention is not limited to this. For example, as shown in FIG. 9, the same number of normal wavy fins 4 and inverted wavy fins 5 are provided.
And may be set in a plurality of sets, and they may be arranged symmetrically with respect to the line x, or may be arranged in various combinations.

Table 1 is a tabulation table of actually measured deformation after brazing in various heat exchangers, in which the arrangement ratios of the normal wavy fins 4 and the inverted wavy fins 5 are made different, and the number of fins is further changed. This is a table in which the deformations after brazing when measured incorrectly are measured. Normal and inverted fin arrangement ratios are "1: 1""1:2""1:3""1:4"
, The number of fins is from 15 to 50 with 5 intervals,
The difference between A and B shown in FIG.
A mark with mm of Δ and a mark of more than 4 mm is described as X. The arrangement of the fins is such that the normal and the reverse are alternately arranged, the normal and the reverse are two, three, and four, and each of these sets is alternately arranged. The upper half was set to be normal and the lower half was made to be inverted, and various measurements were performed, and a simple average value of these numerical values (difference between A and B) was adopted.

According to this, the fin arrangement ratio is "1:".
In the case of "1", good results are obtained regardless of the number of fins, and when the fin arrangement ratio is "1: 2", the fin arrangement ratio is different. It was found that the deformation increased with the increase in the number of.

[0027]

[Table 1]

[0028]

As described above, according to the present invention,
Since a regular wavy fin along the fin forming transfer direction and an inverted wavy fin that is inverted with respect to this normal wavy fin are regularly arranged between a plurality of laminated tubes,
Residual stresses remaining in the wavy fins during the forming process of the wavy fins cancel each other out, preventing the residual stress from acting in one direction during integral brazing due to heating and deforming the front shape of the heat exchanger. can do. As a result, there will be no positional deviation between the bracket and its mounting part, and the mounting work will be facilitated. Also, cracks in the brazing part and leakage of the heat exchange medium from this crack will occur as a result of forcibly mounting the bracket. Can be prevented.

[Brief description of drawings]

FIG. 1 is a front view of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is an enlarged front view showing a disposition state of wavy fins.

FIG. 3 is an explanatory diagram showing the reversal of the wavy fins.

FIG. 4 is an explanatory diagram illustrating the molding of a tube.

FIG. 5 is an explanatory view illustrating the forming of a wavy fin.

FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 1, showing a header tank.

FIG. 7 is an explanatory diagram illustrating a method of reversing a wavy fin according to another embodiment of the present invention.

FIG. 8 is an explanatory diagram illustrating a method of reversing a wavy fin according to another embodiment of the present invention.

FIG. 9 is an enlarged front view showing another embodiment of the arrangement direction of the wavy fins of the present invention.

FIG. 10 is a front view of a main portion for explaining a disposition state of wavy fins according to a conventional example.

FIG. 11 is a schematic front view of a heat exchanger.

[Explanation of symbols]

 1 heat exchanger 2, 3 header tank 4 normal wavy fins 5 inverted wavy fins 6 tube

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 2, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

The header tanks 2 and 3, the blind cap 7, the inlet joint 9, the outlet joint 10, and the partition plate 11 are also molded and transferred. As the header tanks 2 and 3, in the present embodiment, as shown in FIG. 6, the header tanks 2 and 3 including the end plate 21 and the tank plate 22 which are divided into two in the radial direction are used. Incidentally, in FIG. 6, 2
Reference numeral 3 indicates a tube insertion hole.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

Then, each member is fed to the automatic assembling machine of the heat exchanger 1. In the assembling machine, first, the plurality of flat tubes 6 and the side plates 8 on both sides are aligned vertically in the width direction. The corrugated fins 4 and 5 are sequentially inserted between them. In this case, the normal wavy fin 4 described above
And the inverted wavy fins 5 are regularly arranged, for example, alternately. After that, the insertion holes 23 of the end plates 21 of the header tanks 2 and 3 are inserted into both ends of the aligned flat tubes 6, the tank plates 22 of the header tanks 2 and 3 are attached to the end plates 21, and the header tanks 2 and 3 are attached. The blind cap 7 is attached and clamped by the jig in the furnace.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

As described above, in this embodiment, the normal wavy fins and the inverted wavy fins are alternately arranged between the aligned flat tubes, so that the wavy fins themselves are formed at the time of forming for forming the wavy shape. Since the residual stresses in the heat exchanger are arranged so as to cancel each other out, when the brazing is performed by heating, the residual stress of the wavy fin acts in one direction and the front shape of the heat exchanger is distorted. Therefore, the appearance of the product can be secured. As a result, the bracket of the heat exchanger and the mounting portion will not be displaced, and since it is not necessary to forcibly mount it, cracks will not occur in the brazing portion, and leakage of the heat exchange medium from the cracks will be eliminated. . Further, due to the forming forming of the wavy fins, the front height and the rear height of the wavy fins may not match when viewed from the front side. In this case, the conventional arrangement mode in which the wavy fins are stacked as they are When this is done, the difference in height between the front and rear is cumulatively added by the plurality of wavy fins, and the heat exchanger is inclined to the front side or the rear side. In that respect, according to the present embodiment, since the normal wavy fins and the inverted wavy fins are alternately arranged between the flat tubes, the height difference between the front and the back of the wavy fins is offset, which causes such a problem. Can be avoided.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takafumi Umehara 2873-1, Shinozuka, Ura-cho, Euraku-gun, Gunma Toyo Cold Energy Co., Ltd.

Claims (2)

[Claims] 1. A parallel flow heat exchange system in which tubes arranged in parallel with each other and corrugated fins interposed between the tubes are stacked, and header tanks are connected in communication with both ends of the arranged tubes. In the container, the corrugated fins are regularly arranged by a normal corrugated fin along the fin forming transfer direction and an inverted corrugated fin that is the reverse of the normal corrugated fin. Flow heat exchanger. 2. A tube cut into a predetermined length, a corrugated fin formed by a molding gear and cut into a predetermined number of ridges and a pitch, and other members such as a header tank are transferred to a plurality of tubes in an automatic assembly machine. Parallel flow heat exchanger in which the corrugated fins are interposed between adjacent tubes, the header tanks are attached to both ends of the tubes, and clamped by a jig in the furnace for integral brazing by heating. In the manufacturing method of (1), when the corrugated fins are interposed between the tubes, the normal corrugated fins along the fin forming transfer direction and the reversed corrugated fins inverted with respect to the normal corrugated fins are separately and automatically A method for manufacturing a parallel flow heat exchanger, which comprises transferring to an assembling machine and regularly disposing both wavy fins.