JPH04288484A - Assembled brazing method of mounting bracket in heat exchanger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 provided 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 tube and header are collectively brazed together and the bracket is joined to the header.

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. When using a jig, it is necessary to remove the jig after brazing, so the surrounding piece was spot welded to the header using argon welding.

[0005]

[Problems to be Solved by the Invention] However, temporary fixing by argon welding is still not sufficient to improve brazing work efficiency, and expensive argon welding equipment must be prepared, resulting in equipment costs. In addition, there was also a quality problem in that argon welding had an adverse effect on the header, reducing the quality of the header.

[0006] The present invention solves the above-mentioned conventional drawbacks and makes it possible to braze the mounting bracket to the header.
The purpose of the present invention is to provide a method that can improve work efficiency, reduce costs, and maintain high quality headers.

[0007]

[Means for Solving the Problems] To achieve the above object, the present invention provides a mounting bracket that is brazed to a hollow header that connects the ends of a plurality of tubes arranged in parallel at predetermined intervals in a communicating state. The brazing piece has a brazing piece disposed in surface contact with the outer peripheral surface of the header, and a protruding piece protruding from the brazing piece toward the tube side, and the brazing piece is is placed at a predetermined position on the outer circumferential surface of the header, and the protruding piece is placed so as to protrude toward the tube side, and the locking piece is engaged with the protruding piece using a locking piece. The heat exchanger is characterized in that the bracket is assembled to the header in a temporarily fixed state by fitting into the tube in this state, and in this state, the bracket and header are collectively brazed together with the locking pieces. This article summarizes the method for collectively brazing the mounting brackets on the device.

[0008]

[Operation] In the above method, the bracket is temporarily attached to the header using the locking piece, and brazing is performed in this state. There are no negative effects. Further, since the bracket and header are collectively brazed together with the locking pieces in the assembled state, there is no need to remove the locking pieces after brazing, and work efficiency is improved.

[0009]

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. 3 and 4, (1) is a flat tube, and (2) is a corrugated fin, which are arranged in parallel and alternately vertically. 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). (6) is a lower mounting bracket for attaching the heat exchanger main body to the vehicle body at its lower part; and (7)
) is an upper mounting bracket according to the present invention for attaching the heat exchanger main body to the vehicle body at its upper part;
5) is a U-shaped locking piece. Note that (8) is a partition member that partitions the inside of the header (3) (3) at a predetermined height position so that the heat exchange medium flows through the tube (1) group in a meandering manner. (9) (9) is a side plate, which is placed on the outside of the upper and lower outermost corrugated fins (2) (2) to protect them.

[0011] 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.

[0012] 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.

[0013] The header (3) (3) is made by bending a single aluminum brazing sheet clad with a brazing material layer on one or both sides so that both edges are butted, as shown in Fig. 2. The upper and lower end openings of a cylindrical header pipe (3a) formed into a pipe shape are closed with aluminum header caps (3b) and (3c) that are fitted onto the outside. In addition, the header pipe (3a)
As such, electric resistance welded pipes, extruded pipes, etc. may be used.

The upper mounting bracket (7) is a press-molded product made of an aluminum plate, and includes a brazing surrounding piece (7a) that is U-shaped in plan view and surrounds the outer peripheral surface of the header (3). An attachment part (7c) connected to the upper end of the enclosing piece (7a) in an upwardly protruding state, and an inner part protruding toward the tube (1) at one side edge of the enclosing piece (7a). It is made to have a U-shaped protruding piece part (7b) integrally. The distance between the inner edges of both sides (7d) of this projecting piece (7b) is as shown in FIG. 1 when the holding piece (7a) is placed on the header (3). The inner edges of both sides (7d) are both arranged at the gap between the tubes (1). Note that a groove (15) is formed on the inner surface of the surrounding piece (7a) of the bracket (7), and when the surrounding piece (7a) is placed on the outer peripheral surface of the header (3), the header ( 3) A space (13) is formed at the seam (10) on the circumferential side to allow flow of brazing material, flux, etc.

On the other hand, the U-shaped locking piece (15) is manufactured by cutting an extruded aluminum material having a U-shaped cross section.
) will be used for temporary fixing. The lengths of both sides (15a 1 ) (15a 2 ) of this locking piece (15) are set to be approximately the same as the width of the tube (1), as shown in FIG. In addition, as shown in FIG. Both sides (15a) (15a) are inserted into the gap between the tubes (1), and the other locking piece (15) is connected to the other side (7d) of the protruding piece (7b). While straddling the tube (1) and inserting both sides (15a) (15a) into the gap between the tubes (1), one side (15a) of the locking pieces (15) (15) 15a) The inner surface contacts or presses the upper and lower surfaces of the tube (1), and the inner surface of the other side (15a) contacts or presses the inner edge of the side (7b) of the protruding piece (7b). It is set to the mode that will be used.

In manufacturing a heat exchanger, first, the constituent members of the heat exchanger are assembled into a temporary assembly 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, the upper and lower side plates (9) (9) are arranged outside the outermost fins (2) (2), and the inlet/outlet pipe (
4) Assemble (5) to the header (3). In addition, as shown in FIGS. 1 and 2, the surrounding piece (7a) of the upper mounting bracket (7) is arranged on the outer peripheral surface of the upper end of the header (3), and one of the locking pieces ( 15) Both sides of (
15a) (15a) is inserted into the gap between the tubes (1) in such a manner that it straddles one side (7d) of the protrusion piece (7b), and in the same way, another locking piece is inserted. Both sides (15a) (15a) of the piece (15) are inserted into the gap between the tubes (1) in such a manner that they straddle the other side (7d) of the protruding piece (7b), thereby The locking pieces (15) (15) are fitted to the tube (1), and the bracket (7) is temporarily attached to the header (3). Note that there is no particular restriction on the order of assembling the heat exchanger components, and the assembly may be performed in an appropriate order.

[0017] Then, flux is sprayed onto this heat exchanger assembly, and then this assembly is passed through a brazing furnace, and each of the heat exchanger constituent members is brazed to each other at once to join the entire assembly. Unify. By this brazing, the locking pieces (15) (15) are also integrally joined to the heat exchanger body, and therefore, the locking pieces (15) (15)
) is not required to be removed from the heat exchanger body after brazing.

Thereafter, the lower mounting bracket (6) is fastened to the lower surface of the lower header cap (3c) with screws (16). The condenser is manufactured by the above steps.

The structure of the protruding piece of the bracket (6) and the structure of the locking piece are such that the locking piece is fitted onto the tube with the protruding piece engaged. Therefore, it is not limited to the structure of the above embodiment. For example, as shown in FIG. 5, the locking piece (15) is configured with an E-shaped member,
b) is formed to a thickness that matches the spacing between the tubes (1), and the spacing between the upper and lower sides (15c) (15c) is set to match the outer surface of the outermost tube of the group of tubes (1). This locking piece (15) should be approximately equal to the spacing, and the locking piece (15) should be
Three sides (15b) (15c) (15c) while straddling both sides (7d) (7d) of the protruding piece (7b) at once.
) may be inserted into the gap between the tubes (1), thereby temporarily fixing the bracket (7) to the header (3). The locking force in this case is the center side (1
5b) is press-fitted into the gap between the tubes (1), and/or the upper and lower sides (15c)
(15c) is obtained by clamping the tube (1).

[0020]

Effects of the Invention As described above, the method of brazing a mounting bracket for a heat exchanger according to the present invention temporarily assembles the bracket to the header by using a locking piece to assemble the bracket to the header. Since it is done by brazing the bracket, it does not cause problems such as deterioration of the quality of the header, unlike conventional argon welding, and maintains the header in good quality. This also makes it possible to reduce equipment costs. Moreover, since the bracket and header are brazed together with the locking pieces in the assembled state,
There is no need to remove the locking piece after brazing, so
The work efficiency of brazing work can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a mounting bracket temporarily assembled to a header.

FIG. 2 is a perspective view showing a mounting bracket, a header, and other heat exchanger components in a separated state.

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

FIG. 4 is an overall side view of the heat exchanger.

[Fig. 5] This shows another embodiment in which the mounting bracket is temporarily assembled to the header, and Fig. 5 is a front view;
Figure (B) is a sectional view taken along the line II in Figure (A).

[Explanation of symbols]

1...Flat tube 3...Header 7...Top mounting bracket 7a... Envelope piece (brazing piece) 7b...Protruding piece part 15...locking piece

Claims (1)

[Claims] Claim 1: A mounting bracket that is brazed to a hollow header in which the ends of a plurality of tubes arranged in parallel at predetermined intervals are connected in a communicating state, and is arranged in surface contact with the outer peripheral surface of the header. and a protruding piece protruding from the brazing piece toward the tube side, and arranging the brazing piece at a predetermined position on the outer peripheral surface of the header, By arranging the protruding piece so as to protrude toward the tube side, and using the locking piece to engage the locking piece with the protruding piece, the bracket is fitted onto the tube. A method for collectively brazing a mounting bracket for a heat exchanger, characterized in that the bracket and header are assembled to the header in a temporarily fixed state, and in that state, the bracket and header, together with the locking pieces, are collectively brazed.