JP2911238B2 - Brazing method of mounting bracket for heat exchanger - Google Patents

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 in a metal heat exchanger such as aluminum used as a condenser for a car air conditioner, a heat exchanger for a room air conditioner, and the like.

[0002]

2. Description of the Related Art Recently, a pair of hollow headers are connected to both ends of a plurality of tubes arranged in parallel at a predetermined interval as a condenser for a car cooler, for example. Of the structure integrated into the
A so-called multi-flow type or parallel-flow type heat exchanger tends to be used favorably as a device capable of realizing high heat exchange performance and low pressure loss.

The heat exchanger is provided with a mounting bracket for mounting the heat exchanger body to a vehicle body or for supporting an intermediate portion of a refrigerant pipe. And recently, as a method of attaching this, a mounting bracket having a brazing surrounding piece portion surrounding the header outer circumferential surface in the circumferential direction is used, and the inner surface of the surrounding piece portion is placed in surface contact with the header outer circumferential surface. In this state, there is a tendency to adopt a method of performing a collective brazing together with the collective brazing of the tube and the header and joining the bracket to the header.

[0004] On the other hand, as a header of a recent multi-flow heat exchanger, a tube is formed by bending one plate or by combining a plurality of plates in a circumferential direction from various requests. In many cases, a specification is used in which a joint formed on the peripheral side surface is used at the time of the collective brazing and the collective brazing is performed.

[0005]

However, when the above-described header structure and the bracket mounting structure are employed together, the following problems are likely to occur. That is, in a state where the surrounding piece portion of the bracket is arranged on the outer peripheral surface of the header, the surrounding piece portion is often located on the joint of the header. The brazing material does not flow properly in the joint area of the header located at the lower part of the surrounding piece, and the brazing performance of the joint of the header pipe in that part or in the vicinity thereof is hard to be good, and the joining is difficult. There was a danger that the sealing properties of the later jointed joint portions would not be ensured.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, and in a heat exchanger using a header pipe of a type having a seam on the peripheral side, a mounting bracket brazing is provided on the outer peripheral surface of the header pipe. When brazing the header and the bracket with the joint and the brazing of the header and the bracket by arranging the mounting surrounding piece portion, the brazing of the header and the bracket is performed while achieving good brazing joint performance of the joint of the header. It is an object of the present invention to provide a method for brazing a mounting bracket in a heat exchanger.

[0007]

In order to achieve the above object, the present invention has a hollow header in which a plurality of tubes are connected in a communicating state, and a single plate is bent as a pipe for the header. Or, by combining a plurality of plates in the circumferential direction, a brazing piece portion of a mounting bracket is provided on an outer peripheral surface of the heat exchanger using a cylindrical one at a predetermined position in a longitudinal direction of the header. Place the inner surface in a surface contact state, and in that arrangement state,
A method of brazing a side joint of a header pipe, and a header and a mounting bracket, wherein the mounting bracket includes an inner surface of a brazing piece portion,
Corresponding to the joint position of the header pipe, a groove with a tunnel-like space that allows the flow of brazing material such as brazing material or flux between the outer peripheral surface of the header and the header is provided. The gist of the present invention is a method of brazing a mounting bracket in a heat exchanger.

The term "mounting bracket" refers to a bracket for attaching the heat exchanger main body to a mounting side such as a vehicle body or an intermediate portion of an inlet pipe for feeding a heat exchange medium into a heat exchange medium passage in the heat exchanger main body. It is used in the sense that it includes a bracket or the like that supports the middle part of the outlet pipe for sending out the heat exchange medium.

[0009]

According to the above method, in the brazing operation, the brazing material such as brazing material and flux flows through the joint area of the header pipe below the brazing piece part of the bracket through the tunnel-shaped space. Can be. Therefore, the brazing joint performance of the joint of the header pipe in that region is improved.

[0010]

Next, an embodiment in which the present invention is applied to a method of brazing a mounting bracket to a vehicle body in an aluminum condenser for a car cooler will be described with reference to the drawings. It is needless to say that the method of the present invention can be widely applied to various heat exchangers having a header such as a heat exchanger for a room air conditioner and an oil cooler.

In the condenser for a car cooler as a manufactured product shown in FIGS. 3 and 4, (1) is a flat tube, (2) is a corrugated fin, and these are alternately arranged in a vertical state in the vertical direction. Are located in (3) (3)
Is 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 to the right header (3), and (5) is an outlet pipe, which is connected to the left header (3). (6) a lower mounting bracket for mounting the heat exchanger body to a vehicle body at a lower portion thereof, and
(7) An upper mounting bracket according to the present invention for mounting the heat exchanger body on the vehicle body at the upper part. In addition, (8) is a partition member, and a header (3) so that a heat exchange medium flows in a meandering manner through the group of tubes (1).
(3) The inside is partitioned at a predetermined height position. (9)
(9) is a side plate which is disposed outside the upper and lower outermost corrugated fins (2) and (2) to protect them.

In each of the above-mentioned heat exchanger components, the flat tube (1) is made of an extruded aluminum material, and is internally partitioned into a plurality of chambers by partition walls to enhance heat transfer performance. Uses a harmonica tube. In addition, an electric resistance welded tube may be used irrespective of the extrusion material.

The corrugated fin (2) is formed by shaping a sheet material having a width substantially equal to the width of the tube (1) into a corrugated shape and cutting and forming a louver. You are using a brazing sheet. In addition, corrugated fin (2)
May be formed from a normal aluminum sheet instead of a brazing sheet.

As shown in FIG. 2, the headers (3) and (3) are formed by bending a single aluminum brazing sheet having a brazing material layer clad on one side or both sides, as shown in FIG. The upper and lower openings at the upper and lower ends of the cylindrical header pipe (3a) formed into a pipe shape are closed by an aluminum header cap (3b) (3c). On the side surface of the header pipe (3a) opposite to the joint (10), a slit-shaped tube insertion hole (11) is formed at a predetermined interval in the length direction.

The header pipe (3a) is formed by bending the side edges so as to overlap each other as shown in FIG. 7 (a), or as shown in FIG. 7 (b). Various cylindrical bodies having seams (10) in the longitudinal direction, such as two aluminum plates bent in an arc shape are combined in the circumferential direction so that their side edges are aligned. Can be used. The header pipe (3a)
Instead of the brazing sheet, it may be formed by a normal aluminum plate.

Then, the upper mounting bracket (7)
Is a press-formed product from an aluminum plate or an aluminum brazing sheet, and has a U-shaped brazing surrounding piece (7a) surrounding the outer peripheral surface of the header (3); and the surrounding piece (7a). A U-shaped protruding piece (7b) connected to one side edge of the tube so as to protrude toward the tube (1), and an attachment connected to an upper end of the surrounding piece (7a) so as to protrude upward. Part (7c). In the center of the inner surface of the surrounding piece portion (7a), a concave streak (12) is formed extending in the vertical direction at the time of the press forming or before and after the press forming. The large cross section of the concave streak (12) means that when the surrounding piece (7a) of the bracket (7) is assembled to the header (3), the joint (10) of the header pipe (3a) is located at the joint (10). A tunnel-shaped space (13) as shown in FIGS. 1 and 5 is formed between the surrounding piece (7a) and the surrounding piece (7a). It is decided. In addition, concave streak (1
As 2), those having various cross-sectional shapes as shown in FIGS. (15) is an aluminum U-shaped locking piece for temporarily fixing the bracket (7) to the heat exchanger body.

In the manufacture of the heat exchanger, first, the components of the heat exchanger are assembled in a tentatively assembled state. That is, a plurality of flat tubes (1) are arranged side by side at predetermined intervals in the thickness direction thereof, and headers (3) are provided at both ends thereof.
(3) is fitted by inserting the end of the tube (1) into the tube insertion hole (11), and the corrugated fin (2) is inserted and arranged between the tubes (1). Also,
The upper and lower side plates (9) and (9) are arranged outside the outermost fins (2) and (2), and the entrance / exit tube (4)
Assemble (5). At the same time, as shown in FIGS. 1 and 2, the surrounding piece (7a) of the upper mounting bracket (7) is attached to the outer peripheral surface of the upper end of the header (3) by a concave strip (12).
And the seam (10) so that they match, and
5) Use (15) to lock the protruding piece (7b) to the heat exchanger body. There is no special restriction on the order of the temporary set, and the order may be determined in an appropriate order.

Then, a flux is sprayed on the heat exchanger assembly by spraying. In this spraying,
In the area of the surrounding piece (7a) of the upper mounting bracket (7), a tunnel-like space is formed between the surrounding piece (7a) and the joint (10) of the header pipe (3a). Due to its presence, the flux sufficiently spreads to the joint (10) below the surrounding piece (7a). Then, after the flux is sprayed, the assembly is passed through a brazing furnace, and the heat exchanger components are brazed together.
The whole is joined and integrated. During this brazing, in the area of the surrounding piece (7a) of the upper mounting bracket (7), the presence of the tunnel-shaped space (13) formed by the concave streak (12)
The flux and the brazing material flow well, and the joint (10) in the area of the header pipe (3a) is joined in a good condition.

After that, the lower mounting bracket (6) is fixed to the lower header cap (3c) with screws (16).
Fasten to the lower surface. Thus, a condenser is manufactured.

[0020]

As described above, according to the present invention, the method of brazing the mounting bracket in the heat exchanger corresponds to the position of the joint of the header on the inner surface of the brazing piece as the mounting bracket. Then, using a material provided with a recess that forms a tunnel-shaped space portion that allows the flow of brazing material such as brazing material and flux between the outer peripheral surface of the header and the header peripheral surface, Since the eyes and the header and the mounting bracket are brazed to each other, the brazing material, such as flux or brazing material, passes through the tunnel-shaped space during brazing, and the brazing piece of the bracket is brazed. Of the header and the brackets, which are located below the joints. While represents, it can be carried out.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a mounting bracket is 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 is a cross-sectional view of the bracket in a temporarily assembled state.

FIG. 6 is a cross-sectional view showing a concave portion of the bracket, wherein FIG. 6A shows an embodiment and FIG. 6B shows a modified example.

FIG. 7 is a sectional view of a modified example of a header pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Flat tube 3 ... Header 3a ... Header pipe 7 ... Bracket for upper mounting 7a ... Surrounding piece (brazing piece) 10 ... Joint 12 ... Recess 13 ... Space

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B23K 1/18 B23K 1/00 330

Claims (1)

(57) [Claims] A hollow header in which a plurality of tubes are connected to communicate with each other.
By bending a plurality of plates, or by combining a plurality of plates in the circumferential direction, on the outer peripheral surface at a predetermined position in the length direction of the header of the heat exchanger using a tubular one, A method of arranging an inner surface of a brazing piece portion of a mounting bracket in a surface contact state, and brazing a side joint of a header pipe and brazing the header and the mounting bracket in the arranging state. As a bracket, on the inner surface of the brazing piece, a tunnel-like shape that allows the flow of brazing material, such as brazing material and flux, between the outer peripheral surface of the header and the outer peripheral surface of the header corresponding to the joint position of the header pipe A method for brazing a mounting bracket in a heat exchanger, comprising using a groove provided to form a space.