JPH0289564A - Manufacture of heat exchanger - Google Patents

Abstract

PURPOSE:To prevent the generation of leakage of a heat exchanger by abutting a header plate deflection preventing jig consisting of a pair of upper and lower header plate pressing members and an energizing member for energizing both the pressure members to the outside against the inside of a header plate, energizing it and executing the brazing. CONSTITUTION:A tube expanding part 4a is formed in both end parts of a heat exchanger 4, and in both header plates 2, tube expanding part inserting holes 7 are formed at a prescribed interval in the left and the right directions. Subsequently, a pair of left and right side jigs made of stainless steel 10, a band plate clamping tool made of iron 11, and the lower jig 12 of a plate spring made of stainless steel are set. Next, a pair of upper and lower horizontal rod-like header plate pressing members made of stainless steel 21 and two header plate deflection preventing jigs consisting of an energizing member 22 of a spring made of stainless steel for energizing both the pressure members are prepared and each parts are arranged. In this state, the pressing member 21 is energized by the energizing member 22 and both the header plates are energized to the outside. Thereafter, vacuum brazing is executed at a prescribed temperature and a prescribed degree of vacuum and a heat exchanger is manufactured. In such a manner, leakage from a brazed part is prevented, and the work can be easily executed.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method of manufacturing a heat exchanger.

In this specification, the term "aluminum" refers to
In addition to pure aluminum, aluminum alloys are included.

BACKGROUND ART As shown in FIG. 2, a pair of aluminum header plates (2) arranged vertically at a predetermined interval,
An aluminum tank structure (3) is brazed to the outside of both header plates (2) and forms a header tank (1) together with the header plate (2), and an aluminum tank structure (3) is arranged between both header plates (2) and has both ends. A plurality of aluminum heat exchange tubes (4) connected to the header plate (2), and heat exchange tubes arranged between adjacent heat exchange tubes (4) and outside of the heat exchange tubes (4) at both ends. The aluminum corrugated fins (5) are brazed to the pipe (4), and the corrugated fins (5) are placed on the outside of the corrugated fins (5) at both ends, and both ends are brazed to the header plate (2). ) with aluminum side plates (6) brazed to the
Conventionally, it has been manufactured as follows.

That is, as shown in FIGS. 3 and 4, tube expansion portions (4a) are formed at both ends of the heat exchange tube (4), and tube expansion portions (4a) are formed at both header plates (2) at a predetermined interval in the left and right direction. Forming a plurality of expansion tube insertion holes (7), and forming a plurality of heat exchange tubes (4).
) of both end expanded tube parts (4a) respectively to both header plates (
2) into the expansion tube insertion hole (7), between adjacent heat exchange tubes (4) and at both ends of the heat exchange tubes (4).
The corrugated fins (5) are placed outside the corrugated fins (5), and the side plates (5) are placed outside the corrugated fins (5) at both ends.
6), the tank structure (3) is placed outside the header plate (2), and both side plates (
6) A pair of left and right side jigs (lO) placed on the outside, and a strip-shaped tightening tool (11) wrapped around the outside of the jig (10).
Tighten the heat exchange tubes (4), corrugated fins (5) and side plates (6) with The lower tank structure (
3) upwardly and in close contact with the lower header plate (2), the header plate (2) and the tank structure (3), the header plate (2) and the heat exchange tube (4),
This was accomplished by brazing the heat exchange tubes (4) and corrugated fins (5), the side plates (6) and corrugated fins (5), and the side plates (6) and header plates (2), respectively.

Problems to be Solved by the Invention However, when a heat exchanger is manufactured using a conventional method,
The upper header plate (2) softens due to heating during brazing, and due to its gravity, bends downward as shown by the chain lines in Figures 3 and 4, causing the outer circumferential surface of the tube expansion part (4a) and the tube expansion part insertion hole ( 7) The distance from the circumferential surface becomes larger than before brazing.

The above-mentioned interval before brazing is indicated by (AI), and the above-mentioned interval after brazing is indicated by (A2). Therefore, the interval after brazing (
There was a problem in that the gap (A2) was not completely filled due to insufficient brazing material at A2), resulting in poor brazing performance and the risk of leakage occurring from this brazed portion. Moreover, in order to prevent the above-mentioned leakage, it is necessary to perform leakage prevention treatment after brazing, but since the tank structure (3) is brazed to the header plate (2), the above-mentioned leakage prevention treatment is necessary. The problem was that implementation was extremely difficult and costly. Additionally, when the upper header plate (2) bends downward as described above, the heat exchange tube (4) shifts downward,
The distance between the outer peripheral surface of the lower expanded tube part (4a) of the heat exchange tube (4) and the peripheral surface of the expanded tube part insertion hole (7) of the lower header plate (2) also becomes larger, and as a result, the distance between I had a similar problem.

An object of the present invention is to provide a method for manufacturing a heat exchanger that solves the above problems.

Means for Solving the Problems The method of manufacturing a heat exchanger according to the present invention includes a pair of header plates arranged at a predetermined interval in the vertical direction, and a header tank which is brazed to the outside of both header plates together with the header plate. , a plurality of heat exchange tubes disposed between both header plates and connected at both ends to the header plate, and a heat exchange tube disposed between adjacent heat exchange tubes and brazed to the heat exchange tubes. A method for manufacturing a heat exchanger equipped with corrugated fins, the method comprising: forming a plurality of heat exchange tube insertion holes at predetermined intervals in the left and right direction in both header plates; 1. Insert the parts into the heat exchange tube insertion holes of both header plates, place corrugated fins between adjacent heat exchange tubes, place the tank structure on the outside of the header plate, Tightening the heat exchange tubes and corrugated fins with a pair of side jigs and tightening tools, tightly fitting the lower tank structure to the lower header plate with a lower jig placed below the lower tank structure, and Header plate and tank structure, header plate and heat exchange tube,
When manufacturing a heat exchanger by brazing heat exchange tubes and corrugated fins, a pair of upper and lower horizontal header plate pressing members are placed at a predetermined interval in the vertical direction, and a pair of horizontal header plate pressing members are placed between both pressing members. A header plate deflection prevention jig is prepared, each of which has both ends fixed to a pressing member and includes a biasing member that urges both of the pressing members outward. This method is characterized in that the above brazing is performed while applying a member to the inside of the header plate and urging both header plates outward.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings together with comparative examples.

Example J I A core material made of 5A3003 alloy with a wall thickness of 1, . A header plate (2) was made from a 6av plating sheet.

In addition, a tank structure (3) was made from a plating sheet having the same structure as the header plate (2) and having a wall thickness of 2.9 nua. Further, a corrugated fin (5) was made from a plating sheet with a wall thickness of 0.1451 mm, in which both sides of a core material made of J15A3003 alloy were covered with a skin material made of aluminum solder containing 10 vt% silicon and 1 wt 9 g of magnesium. Furthermore, JISAI1
Heat exchange tube made from 00 alloy with a peripheral wall thickness of 0°7mm (4)
Side plates (6) with a wall thickness of 1.6 mm were made from JISA3003 alloy. First, tube expansion portions (4a) are formed at both ends of the heat exchange tube (4), and a plurality of tube expansion portion insertion holes (7) are formed in both header plates (2) at predetermined intervals in the left and right direction. Formed. In addition, a pair of left and right stainless steel side jigs (lO), iron (including N4) band-like tightening tools (11), and a lower jig (12) made of stainless steel plate springs are prepared. did. Further, a pair of horizontal stainless steel rod-shaped header plate pressing members (21) arranged at a predetermined interval in the vertical direction, and a pressing member (21) arranged between both pressing members (21) with both ends thereof > and a biasing member (22) made of a plurality of stainless steel plate springs that bias both pressing members (21) outward. The length of the header plate 1/pressing member (21) is approximately equal to the length of the header plate (2).

Then, in the same manner as in the prior art, the header plate (2), tank structure (3), heat exchange tube (4), corrugated fin (5), and side plate (6>) are arranged, and a pair of left and right side jigs are (10), a fastener (11) and a lower jig (12) were set.

Next, the header plate pressing member (21) of each header plate deflection prevention jig (20) is attached to the header plate (2).
The pressing member (21) is pressed outward by the urging member (22) against both side edges of the surface facing the other header plate (2), thereby causing both header plates (2) to move outward. I kept it energized.

In this state, vacuum brazing was performed under the conditions of a preheating temperature of 560°C for 50 minutes, a heating temperature of 600°C for 25 minutes, and a vacuum degree of 1O-5 Torr to manufacture a heat exchanger.

Comparative Example A heat exchanger was manufactured in the same manner as in the above example except that no jig for preventing header plate deflection was used.

Evaluation test In order to evaluate the performance in the above examples and comparative examples, both left and right ends (X) were tested before and after the above brazing.
(Y) and the left and right center portions (Z), the distance (AI ) (A2
) was measured. The above distance (A2) after brazing was measured excluding the area where the brazing material was present. The results of these measurements are shown in Table 1.

Further, in the heat exchangers manufactured in the above Examples and Comparative Examples, the vertical deviation (B) of the upper header plate (2) from its original position (see FIG. 4) was measured. The results are shown in Table 2.

In the above description, expanded tube portions are formed at both ends of the heat exchange tube, but expanded tube portions are not necessarily required. In addition, in the above, two jigs for preventing header plate deflection are prepared, and the header plate pressing member is brought into contact with both side edges of the header plate, but one jig for preventing header plate deflection is used. The header plate pressing member may be brought into contact with one side edge of the header plate. In addition, the header plate pressing member and biasing member in the jig for preventing header plate deflection are made of stainless steel, but are not limited to this, and may be brazed to the header plate during brazing, or Any material can be changed as appropriate as long as it does not pose a risk of contaminating the parts.

Further, in the above description, a method for manufacturing a heat exchanger is shown in which corrugated fins are also arranged outside the heat exchange tubes at both ends, and side plates are arranged outside the corrugated fins. The method is also applicable to the production of heat exchangers without the above corrugated fins and side plates. Further, in the above, the header plate, the tank structure, and the corrugated fin are made of plating sheet, but the present invention is not limited to this.

Effects of the Invention According to the method for manufacturing a heat exchanger of the present invention, a pair of upper and lower horizontal header plate pressing members arranged at a predetermined interval in the vertical direction, and a pair of horizontal header plate pressing members arranged between both pressing members with both ends thereof A header plate deflection prevention jig consisting of a biasing member that is fixed to the pressing member and urges both of the pressing members outward is prepared, and the header plate pressing member of the header plate deflection prevention jig is fixed to the header plate. Since the above-mentioned brazing is performed while applying pressure to the inside and urging both header plates outward, it is possible to prevent the header plates from bending due to heating during brazing, and the heat exchange tube The distance between the outer circumferential surface of the expanded tube portion and the circumferential surface of the outer circumferential surface of the expanded tube portion is prevented from becoming larger than before brazing. Therefore, it is possible to prevent leakage from occurring from the brazed portion due to insufficient brazing material at the above-mentioned intervals, resulting in poor brazing performance. Moreover, there is no need to carry out any leakage prevention treatment to prevent the above-mentioned leakage, making the work easier and reducing costs.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the method of the present invention, Fig. 2 is a perspective view of a heat exchanger to be manufactured, Fig. 3 is a perspective view showing the prior art, and Fig. 4 is an enlarged vertical view of the main part of Fig. 3. FIG. (1)...Header tank, (2)...Header plate, (3)...Tank structure, (4)...Heat exchange tube, (5)...Corrugate fin, (7) ...Pipe expansion part insertion hole (heat exchange tube insertion hole), (10)...Side jig,
(11)...Tightening tool, (12)...Lower jig, (2
0)...Header plate deflection prevention jig, (21).
...Header plate pressing member, (22)...Biasing member. Patent applicant Showa Aluminum Co., Ltd. Figure 4

Claims (1)

[Claims] A pair of header plates (2) arranged at a predetermined interval in the vertical direction, and a header tank (1) that is brazed to the outside of both header plates (2) together with the header plate (2). ) and both header plates (2), both ends of which are located between the tank structure (3) and both header plates (2)
), and corrugated fins (5) arranged between adjacent heat exchange tubes (4) and brazed to the heat exchange tubes (4). A method for manufacturing a heat exchanger, comprising: forming a plurality of heat exchange tube insertion holes (7) at predetermined intervals in the left-right direction in both header plates (2); Insert both ends of the header plates (2) into the heat exchange tube insertion holes (7), arrange the corrugated fins (5) between adjacent heat exchange tubes (4), 2) on the outside of the tank structure (
3), and tightening the heat exchange tubes (4) and corrugated fins (5) with a pair of left and right side jigs (10) and tightening tools (11), and under the lower tank structure (3). Lower tank structure (3) with lower jig (12) placed on the side
to the lower header plate (2), as well as the header plate (2) and the tank structure (3), the header plate (2) and the heat exchange tube (4), and the heat exchange tube (4) and the corrugated fin (5). ) in manufacturing a heat exchanger, a pair of upper and lower horizontal header plate pressing members (2
1), which is arranged between both pressing members (21) and has both ends fixed to the pressing members (21), and both pressing members (21).
A header plate deflection prevention jig (20) consisting of a biasing member (22) that urges the header plate deflection prevention jig (20) outward is prepared, and a header plate pressing member (21) of the header plate deflection prevention jig (20) is prepared. A method for manufacturing a heat exchanger, characterized in that the above-mentioned brazing is performed while pressing the header plate (2) on the inside of the header plate (2) and urging both header plates (2) outward.