JPH04288487A - Brazing method of mounting bracket in heat exchanger - Google Patents

Abstract

PURPOSE:To permit the temporary incorporation of a mounting bracket to a header and improve the workability of incorporation by a method wherein a caulking piece is caulked under a condition that a surrounding piece is arranged so as to be welded by pressure to the outer periphery of the header. CONSTITUTION:Upon incorporating a heat exchanger in a car cooler or the like, a plurality of flat tubes 1 are arranged in parallel with predetermined spaces at first and headers 3, 3 are fitted to both ends of the tubes 1 while corrugate fins 2 are arranged between the tubes 1 to insert them. Forked surrounding parts 13a, 13a of a surrounding piece 13 in a mounting bracket 6 are penetrated through gaps between the tubes 1 to surround the whole periphery of the header 3 by the surrounding piece 13. Then, caulking pieces 14 are caulked onto the base end of the surrounding piece 13 to weld the surrounding piece 13 to the header 3 by pressure and incorporate the mounting bracket 6 into the header 3 temporarily. Such an incorporated body is passed through a brazing furnace to connect the whole of them integrally.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for brazing a mounting bracket on a heat exchanger made of metal such as aluminum and used as a condenser for a car air conditioner, a heat exchanger for a room air conditioner, or the like.

0002

[Prior Art] Recently, for example, as a condenser for a car cooler, a pair of hollow headers are assembled in communication with each other at both ends of a plurality of tubes arranged in parallel at a predetermined interval, and are connected to each other by brazing. of integrated structure bonded to,
Heat exchangers called multi-flow type or parallel flow type tend to be used favorably because they can achieve high heat exchange performance and low pressure loss.

[0003] This heat exchanger is attached with an attachment bracket for attaching the heat exchanger main body to the vehicle body or for supporting the intermediate portion of the refrigerant piping. Recently, as a method for attaching this, a mounting bracket having a brazing enclosing piece that circumferentially surrounds the outer circumferential surface of the header is used, and the inner surface of the enclosing piece is placed in surface contact with the outer circumferential surface of the header. In this state, a method is increasingly being adopted in which the bracket is joined to the header by performing bulk brazing together with the tube and header together.

By the way, in the method of attaching the bracket to the header by brazing, it is necessary to temporarily assemble the bracket to the header before performing bulk brazing. This was done by using a jig or spot welding the enveloping piece to the header using argon welding.

[0005]

[Problems to be Solved by the Invention] However, when using a jig, there are not only problems such as the structure of the jig itself being complicated and manufacturing costs increasing, but also the removal work required after brazing. There were problems such as bad sex.

[0006] Furthermore, temporary fixing by argon welding is still not sufficient to improve brazing work efficiency, and expensive argon welding equipment must be prepared, which increases the cost of the equipment. There was also a quality problem in that argon welding had an adverse effect on the header, reducing the quality of the header.

[0007] The present invention solves the above-mentioned conventional drawbacks and makes it easier to braze the mounting bracket to the header.
To provide a method that eliminates the use of jigs, improves work efficiency, and maintains high quality headers.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a mounting method in which the ends of a plurality of tubes arranged in parallel at predetermined intervals are brazed to a cylindrical header in which the ends of a plurality of tubes are connected in a communicating state. As a bracket for the header, one having an integral structure or a split structure is used, which has an enclosing piece part arranged in an encircling state on the outer peripheral surface of the header, and a caulking piece part, and the said caulking piece part is attached to the header. In a heat exchanger that is disposed in pressure contact with the outer periphery, the mounting bracket is assembled to the header in a temporarily fixed state by caulking, and the bracket and the header are brazed in this state. The gist is how to braze the mounting bracket.

[0009] The term "mounting bracket" refers to a bracket for mounting the heat exchanger main body to the mounting side of a vehicle body, a bracket for supporting the intermediate part of the heat exchange medium inlet pipe, the outlet pipe, etc. Alternatively, the term is used to include various types of brackets such as pedestal brackets for attaching these brackets.

0010

[Operation] In the above method, the bracket is temporarily fastened to the header by caulking the caulking piece of the bracket, so the bracket acts like a self-jig when assembled to the header, and brazing is completed. Until then, the proper arrangement state will be maintained. Furthermore, there is no adverse effect on the quality of the header during the series of work steps up to the end of brazing.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which the present invention is applied to a method of brazing a mounting bracket in an aluminum condenser body for a car cooler will be described with reference to the drawings. It goes without saying that the method of the present invention can be widely applied to various heat exchangers having headers such as heat exchangers for room air conditioners and oil coolers.

In the car cooler condenser as a manufactured product shown in FIGS. 2 and 3, (1) is a flat tube, (2) is a corrugated fin, and these are arranged in parallel and alternately in the vertical direction. It is located in (3) (3)
are a pair of left and right headers, which are connected to both ends of the flat tube (1) in a communicating state. (4) is an inlet pipe, which is connected in communication with the right-hand header (3); and (5) is an outlet pipe, which is connected in communication with the left-hand header (3). And (6) is a lower mounting bracket for attaching the heat exchanger main body to the vehicle body. Note that (8) is an aluminum partition member, and the heat exchange medium is a tube (
1) Header (3) (3) so that the group flows in a meandering manner
The inside is partitioned at a predetermined height. (9) (9)
is an aluminum side plate placed on the outside of the upper and lower outermost corrugated fins (2) to protect them.

[0013] In each of the above-mentioned heat exchanger components, the flat tube (1) is made of an extruded aluminum material, and the inside is divided into a plurality of chambers by a partition wall to improve heat transfer performance. I am using a harmonica tube. In addition, an electric resistance welded tube may be used instead of extruded material.

[0014] The corrugated fin (2) has a tube (1
) is formed into a corrugated shape with a louver cut and raised, and this sheet material is an aluminum brazing sheet clad with a brazing material layer. In addition, the corrugated fin (2) is
Instead of using a brazing sheet, it may be formed from an ordinary aluminum sheet.

Header (3) (3) is a cylindrical header made into a pipe shape by bending a single aluminum brazing sheet clad with a brazing metal layer on one or both sides so that both edges are butted. The openings at the upper and lower ends of the pipe are closed off with aluminum header caps. Note that as this header pipe, an electric resistance welded pipe, an extruded pipe, etc. may be used. In addition, as shown in FIG. 5, the header (3) is provided with slit-shaped tube insertion holes (11) arranged at predetermined intervals along its length, and are perpendicular to the insertion direction of the tube (1). An opening (3) for inserting the proximal tube portion (4a) of the inlet tube (4) is provided at a predetermined height position on the circumferential side of the front side of the heat exchanger.
a) is formed.

The inlet tube (4) is made of aluminum, and as shown in FIG. A slit (4b) for fitting is formed. The same applies to the outlet pipe (5).

The mounting bracket (6) is a press-molded product of an aluminum brazing sheet clad with a brazing material layer on one or both sides, as shown in Fig. 1(A).
As shown in (b), the surrounding piece (13), the caulking pieces (14) (14), and the attachment piece (15) are integrally connected. Surrounding piece (13
) surrounds the entire circumference of the header (3),
A mounting piece (15) is connected to one edge of the header (15) in an outwardly protruding manner, while also enclosing the side surface of the header (3) on the tube (1) side through the gap between the tubes (1). It branches into two branches toward the other side. Then, the branch surrounding portions (13a) (13a) of the surrounding piece portion (13)
) has an outwardly protruding caulking piece (
14) (14) are connected. In addition, the brazing material layer is
It is located on the inner surface of the bracket (6).

In manufacturing the heat exchanger, first, the constituent members of the heat exchanger are assembled into a tentative state. That is, a plurality of flat tubes (1) are arranged in parallel at predetermined intervals in the thickness direction, and headers (3) (
3) is fitted by inserting the end of the tube (1) into the tube insertion hole (11), and the corrugated fin (2) is inserted between the tubes (1). In addition, upper and lower side plates (9) (9) are arranged outside the outermost fins (2) (2), and the inlet/outlet pipe (4)
Assemble (5) to header (3).

Note that the header (3) of this inlet pipe (4)
As shown in FIG.
This is done by fitting the fitting slit (4b) formed in 4a) into the tube (1). This allows the inlet pipe (4) to be connected to the header (3) without using a jig.
It is held in position against. The same applies to the outlet pipe (5).

In addition to these, a mounting bracket (6
) is assembled. That is, as shown in FIG. 1, the bifurcated surrounding portion (13a) (13
a) at a predetermined height position of the header (3), insert it through the gap between the tubes (1), and insert the enclosing piece (13)
to surround the entire circumference of the header (3). Then, by caulking the caulking piece (14) to the base end of the enveloping piece (13) and bringing the enveloping piece (13) into pressure contact with the header (3), the mounting bracket (6) is attached.
Attach it to the header (3) temporarily. As a result, the mounting bracket (6) maintains a proper arrangement state without causing any displacement at the mounting position until the brazing is completed after the mounting bracket (6) is mounted on the header (3).

[0021] There is no particular restriction on the order of assembling the heat exchanger components, and they may be assembled in any suitable order. For example, when assembling the bracket (6) above, the header (3)
This may be carried out in a state where the tube (1) and the tube (1) are combined, or may be carried out in a state before the tube (1) and the header (3) are combined.

Then, the heat exchanger assembly is passed through a brazing furnace, and the heat exchanger constituent members are collectively brazed to each other to join and integrate the whole. Through the above steps, a heat exchanger is manufactured.

The embodiment shown in FIG.
As for 6), two bodies are adopted. That is, the first bracket component (18) includes an arc-shaped surrounding piece (19) that conforms to the outer circumferential shape of the peripheral side of the header (3) on the front side of the heat exchanger, and the surrounding piece (19). It has a mounting piece (20) connected to the side edge in an outwardly projecting manner. Also,
The second bracket component (21) includes an arc-shaped surrounding piece (22) that conforms to the outer circumferential shape of the peripheral side of the header (3) on the rear side of the heat exchanger, and a side edge of the surrounding piece (22). The caulking piece portions (24) (24) are protruded outward from both upper and lower edges of the outwardly protruding portion (23) connected to the outer protruding portion (23). Both are press-molded products made from brazing sheets with a brazing metal layer on the inner surface. Assembling this bracket (6) to the header (3) involves both bracket component pieces (1
8) Attach the surrounding pieces (19) and (22) of (21) to the header (
3), the caulking piece (24) is caulked to the first constituent piece (18), and both surrounding pieces (19)
) (22) is brought into pressure contact with the header (3). With this arrangement, the mounting bracket (6) can be attached to the header (3) as in the above embodiment.
) until the brazing is completed, the proper arrangement state is maintained without causing any positional deviation at the assembly position.

[0024]

As described above, the method of brazing a mounting bracket for a heat exchanger according to the present invention includes the following steps: By caulking, the mounting bracket is assembled to the header in a temporary state, and the bracket and header are brazed in that state, so there is no risk of quality deterioration of the header, as with conventional argon welding. This makes it possible to braze the bracket while maintaining the header in good quality without causing any problems, and at the same time, it is possible to reduce equipment costs. Furthermore, since the bracket functions as a self-contained jig, there is no need to remove the jig after brazing, unlike when a jig is used, and the efficiency of the brazing work can be improved.

[Brief explanation of the drawing]

FIG. 1 shows the assembled state of a mounting bracket, with figure (a) being a perspective view and figure (b) being a sectional view.

FIG. 2 is an overall front view of the heat exchanger.

FIG. 3 is an overall side view of the heat exchanger.

FIG. 4 is a sectional view showing the assembled state of the bracket in another embodiment.

FIG. 5 is a sectional view showing the assembled state of the refrigerant inlet pipe.

[Explanation of symbols]

1...Flat tube 3...Header 6...Bracket 13, 19, 22...Surrounding piece part 14, 24...Caulking piece

Claims (1)

[Claims] Claim 1: As a mounting bracket that is brazed to a cylindrical header in which the ends of a plurality of tubes arranged in parallel at predetermined intervals are connected in a communicating state, the bracket is surrounded by an outer peripheral surface of the header. In an embodiment in which an integral or split structure having an enveloping piece and a caulking piece to be disposed is used, and the caulking piece is disposed in pressure contact with the outer periphery of the header, A method for brazing a mounting bracket for a heat exchanger, comprising assembling the mounting bracket to the header in a temporarily fixed state by caulking, and brazing the bracket and header in this state.