JPH0593592A - Heat exchanger - Google Patents

Abstract

(57) [Abstract] [Structure] The fitting hole (13) of the outlet joint member (7)
It is composed of a press-fitting hole (13b) and a brazing filler metal reservoir forming hole (13a) having a diameter larger than that, and the tip of the outlet pipe (5) is press-fitted into the press-fitting hole (13b) and formed between them. The brazing filler metal (17) and the brazing filler metal (18) are joined and integrated. [Effect] The joint member (7) can be assembled without using a jig. In addition, the brazing area is enlarged, and a brazing part of good quality without leakage is formed.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art For example, as a condenser for a car cooler,
Recently, for example, as shown in FIG. 5, both ends of a plurality of tubes (1) ... Are connected to a pair of hollow headers (3) (3) in a communicating state, and the tubes (1) ... A refrigerant inlet pipe (4) having a basic structure in which fins (2) ... Are arranged in a gap and connected in communication with headers (3) and (3).
Also, a so-called multi-flow type heat exchanger, in which the refrigerant is internally distributed through the outlet pipe (5), is preferably used because it can realize high heat exchange efficiency, low pressure loss and ultra compactness. Tend to

The manufacture of this heat exchanger is generally done by means of the tubes (1), headers (3), fins (2),
A heat exchanger assembly is manufactured by combining the heat exchanger constituent members such as the inlet pipe (4) and the outlet pipe (5) in a mutually temporary assembled state,
It is performed by integrally brazing these heat exchanger constituent members together in a furnace by collective brazing.

By the way, the refrigerant inlet pipe (4) and the outlet pipe (5) are provided with joint members (6) (7) for connecting pipes for forming a refrigerant circulation circuit at their tip ends. There is. Then, as a method of joining the joint members (6) and (7), the joint members (6) and (7) are temporarily assembled in the distal end portions of the inlet pipe (4) and the outlet pipe (5), and heat exchange is performed. In some cases, a brazing method may be adopted when collectively brazing the container assembly.

Conventionally, in this method, as shown in FIG. 6 (a), the tip end portion of the inlet pipe (53) is press-fitted or expanded into the fitting hole (52) of the joint member (51) for clearance. Rather, it is assembled in a self-jig mode, and in that state, it is jointly brazed by collectively brazing together with other heat exchanger constituent members,
Alternatively, as shown in FIG. 6 (b), the tip of the inlet pipe (56) is inserted into the fitting hole (55) of the joint member (54) with clearance, and the jig is positioned. Then
In this state, a method of integrally brazing by collectively brazing together with other heat exchanger constituent members has been adopted.

[0006]

However, in the former press-fitting method or pipe-expanding method, there is a clearance between the fitting hole (52) of the joint member (51) and the outer peripheral surface of the distal end portion of the inlet pipe (53). As a result, it was difficult to secure a sufficient brazing area, and there was a risk of leakage, and there was concern about quality.

In the latter jig method, the jig structure tends to be complicated, and such a jig must be used for each joint member (54). The temporary assembly work causes an increase in the manufacturing cost of the heat exchanger and the like due to the increase in the work time and the like.

In view of the above-mentioned conventional drawbacks, the present invention makes it possible to secure a wide brazing area between the joint member and the connection pipe for the heat exchange medium inlet and / or the heat exchange medium and to improve the quality of both. An object of the present invention is to provide a heat exchanger that can be brazed and can be manufactured at a cost advantage.

[0009]

According to the present invention, the tip of the connecting pipe for the heat exchange medium inlet and / or the outlet is disposed in the fitting hole portion of the joint member in a forced fitting state. At the same time, a brazing filler metal reservoir is formed between the peripheral wall in the fitting hole portion and the outer peripheral surface of the tip of the connecting pipe, and the joint member is joined and integrated with the connecting pipe by the brazing filler metal in the brazing filler metal reservoir. The gist is a heat exchanger characterized by the following.

[0010]

In the above structure, since the joint member is such that the tip of the connection pipe for the heat exchange medium inlet and / or the outlet is arranged in the fitting hole in the forcibly fitted state. Assembled with a jig, and no jig is required. Moreover, a brazing filler metal reservoir is formed between the peripheral wall in the fitting hole portion and the outer peripheral surface of the tip of the connecting pipe, and the joint member is joined and integrated with the connecting pipe by the brazing filler metal in the brazing filler metal reservoir. Therefore, a large brazing area can be secured, and a brazing part of good quality without leakage can be formed.

[0011]

EXAMPLES Next, examples in which the present invention is applied to a multi-flow type aluminum condenser for a car cooler will be described. The method of the present invention is applicable to heat exchangers for room air conditioners, heat exchangers for various uses such as oil coolers, and so-called serpentine type heat exchangers in which tubes are meandered to form a heat exchanger core. Needless to say, it can be widely applied to various types of heat exchangers.

In the heat exchanger shown in FIG. 5,
(1) is a flat tube, (2) is a corrugated fin,
These are arranged in parallel in the vertical direction alternately.
(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. And
(4) is an inlet pipe, and (5) is an outlet pipe, which is connected to the header (3) in a communicating state. (6) is a flare type joint member joined to the tip of the inlet pipe (4), and (7) is a block-like joint member joined to the tip of the outlet pipe (5). In addition, (8) is a partition member, and the header (3) is arranged so that the refrigerant circulates in the tube (1) group in a meandering manner.
(3) The inside is partitioned at a predetermined height position. (9)
Reference numeral (9) is a side plate, which is arranged outside the upper and lower outermost corrugated fins (2) and (2) to protect the corrugated fins.

In each of the above heat exchanger constituent members, the flat tube (1) is made of an extruded aluminum material, and as shown in FIG. 2, the inside is divided into a plurality of chambers by partition walls. It is a so-called harmonica tube with improved heat transfer performance and pressure resistance. An electric resistance welded pipe may be used regardless of the extruded mold material.

The corrugated fin (2) is a corrugated sheet material having a width substantially the same as the width of the tube (1) and cut and raised louvers. As the sheet material, a brazing material layer clad aluminum is used. A brazing sheet is used.

The headers (3) and (3) have a cylindrical shape which is formed into a pipe shape by bending one aluminum brazing sheet having a brazing material layer clad on one side or both sides into a state where both side edges are butted. Header pipe (3a)
Open the top and bottom openings of the aluminum header cap (3
It was closed in b) in the external fitting state. The header (3) is provided with tube insertion holes (3c) for inserting the ends of the tube (1), and the proximal ends of the inlet pipe (4) and the outlet pipe (5) at predetermined positions. Is formed with an inlet pipe insertion hole, an outlet pipe insertion hole (3e), and the like. As the header pipe (3a), an electric resistance welded pipe, an extruded pipe or the like may be used.

The outlet pipe (5) is a brazing filler metal pipe made of aluminum having a brazing filler metal layer clad on at least the outer surface thereof, and for example, an electric resistance welded pipe made of an aluminum brazing sheet is preferably used. On the outer peripheral surface of the tip of this outlet pipe (5), a flange (1
1) is formed by the beading process. Also,
The base end portion is reduced in diameter through the step (5a), and the upper and lower portions of the reduced diameter portion (5b) are cut by die pressing to fit in the gap between the tubes (1) and (1). It is supposed to be fitted in the state.

The outlet joint member (7) is made of an aluminum block material having a predetermined shape having a flat surface portion (12) on the lower surface, and the distal end portion of the outlet pipe (5) is inserted and fitted into the lower surface. The fitting hole portion (13) is provided. The fitting hole portion (13) has a large diameter brazing filler metal reservoir forming hole portion (13a) on the opening side, and a smaller diameter than the opening portion on the opposite opening side into which the tip end portion of the outlet pipe (5) is press-fitted. It is composed of a press-fitting hole portion (13b), and these two hole portions (13a) (13b) are coaxially formed via a step. At the tip of the press-fitting hole (13b), there is provided a hole (14) for relatively small-diameter refrigerant flow through a step (15) for abutting the tip of the outlet pipe (5). Has been formed. The position of this step (15) and the formation position of the flange (11) of the outlet pipe (5) are
As shown in FIG. 3, with the tip of the outlet pipe (5) fitted and arranged in the fitting hole (13), the tip of the outlet pipe (5) contacts the step (15). In addition, the flange (11) is set to be in surface contact with the lower surface flat portion (12) of the joint member (7).

Although not shown in detail, the inlet pipe (4) and the flare joint member (6) for inlet are not shown in detail, but the inlet pipe (4) is made of an aluminum brazing material having a brazing material layer clad on the outer surface thereof. In the inlet joint member (6) made of a clad pipe, the fitting hole portion (1) including the brazing filler metal reservoir forming hole portion (13a) and the press-fitting hole portion (13b) similar to the above.
The point 3) is provided is similar.

In manufacturing the heat exchanger, first, the respective heat exchanger constituent members are assembled in a temporarily assembled state. That is, as shown in FIG. 2, a plurality of flat tubes (1) are arranged in parallel in the thickness direction at predetermined intervals, and headers (3) and (3) are inserted into the tubes at both ends thereof. Hole (3
Insert the end of the tube (1) into c) to fit the corrugated fin (2) into the tube (1).
Insert and place in between. In addition, the partition member (8), the side plates (9) (9), etc. are assembled. Also the outlet pipe (5)
The brazing filler metal ring (10) is arranged at the base end of the tube, and the base end reduced diameter part (5b) is inserted into the header (3) through the insertion hole (3e), so that it is placed in the gap between the tubes (1) Plug in. Due to this insertion, the outlet pipe (5) is held in the positioned state in the header (3). The same applies to the inlet pipe (4).

At the same time, joint members (6) and (7) are attached to the respective tip portions of the inlet pipe (4) and the outlet pipe (5). That is, as shown in FIG. 3, the outlet joint member (7) is formed by inserting the tip of the outlet pipe (5) into the fitting hole (13) of the fitting hole (13). Press into the press-fitting hole (13b) to bring the tip of the outlet pipe (5) into contact with the step (15) and the flange (11) into contact with the lower surface flat portion (12) of the joint member (7). Assembled in a tight state. In this assembled state, a brazing filler metal reservoir (17) is formed between the peripheral wall inside the brazing filler metal reservoir forming hole portion (13a) and the outer peripheral surface of the tip end portion of the outlet pipe (5). The gap of the brazing material reservoir (17) is preferably set to 0.3 mm or less in order to effectively produce the capillary action of the brazing material during brazing. The heat exchanger assembly is manufactured as described above. The same applies to the inlet joint member (6).

Then, this heat exchanger assembly is put into a furnace and flux brazing or vacuum brazing is performed to integrally bond the whole. By this brazing, as shown in FIG. 1, the brazing filler metal (18) is drawn into the brazing filler metal reservoir (17) between the outlet joint member (7) and the outlet pipe (5) by capillary action, Both are firmly joined and integrated by this brazing filler metal (18) while ensuring a sufficient brazing area. The same applies to the inlet joint member (6). Further, the flange (11) and the flat surface portion (12) of the joint member (7) are also brazed to each other to obtain a stronger joint state. Further, the flange (11) and the like prevent the brazing filler metal (18) accumulated in the brazing filler metal reservoir (17) from unintentionally flowing out. In addition, since the width of the gap space of the brazing filler metal reservoir (17) is set so that the brazing filler metal is drawn in by the capillary action, brazing should be performed with the joint member (7) oriented in either direction. Even if you go, it will be brazed to the proper quality. The heat exchanger is manufactured as described above.

In another embodiment shown in FIG. 4 (a), in the outlet pipe joint member (5), the press-fitting hole portion (13b) and the refrigerant flow hole (14) have the above contacting step. (15) It was communicated without. The fitting length of the outlet pipe (5) can be regulated by the flange (11).

In the embodiment shown in FIG. 4 (b), the flange (11) is omitted in the outlet pipe (5).

In the embodiment shown in FIG. 4 (c), the tip of the outlet pipe (5) is reduced in diameter to form a step (19), and this step (19) is connected to the outlet joint member (7). The brazing area is expanded by abutting on the lower surface flat portion (12).

In the embodiment shown in FIG. 4 (d), in the outlet joint member (7), the press-fitting hole portion (13a) and the refrigerant flow hole (14) have the contact step (19) as described above. ), And the flange (11) is omitted in the outlet pipe (5). Basically, such a configuration may be adopted.

In the embodiment shown in FIGS. 4 (e-1) and (e-2), the fitting hole (13) is formed as a hole having a constant diameter in the longitudinal direction, and the hole (13) is formed. A large number of concavo-convex stripes (20) extending in the longitudinal direction are formed on the inner peripheral wall, and the tip of the outlet pipe (5) is forcibly fitted into the hole (13). Then, in this forcibly fitted state, the uneven strip (20)
As a result, a large number of brazing filler metal reservoirs (21) extending in the lengthwise direction are formed between the fitting hole portion (13) and the outer peripheral portion of the distal end portion of the outlet pipe (5), and the brazing filler metal (22) is placed there. It was done.

In the present invention, only the joint structure of the inlet pipe (4) and the joint member for the inlet pipe (6) or the joint structure of the outlet pipe (5) and the joint member for the outlet pipe (7) is used. Needless to say, it may be applied.
Further, as the constitutional aspect of the joint member, in addition to the block-shaped type and the flare fastening type as in the above-mentioned embodiment, various types of joint members can be adopted. Also, the brazing of the joint members (6) (7) and the connecting pipes (4) (5) is performed at the same time as the above-mentioned collective brazing of the tube (1), the header (3) and the like. You can use the one you gave me,
It may be performed separately from this collective brazing.

[0028]

As described above, the heat exchanger of the present invention is
Since the tip of the heat exchange medium inlet and / or outlet connection pipe is arranged in the fitting hole of the joint member in a forced fitting state, it is necessary to use a jig for brazing. Therefore, it can be manufactured with good workability and cost advantage. Moreover, a brazing filler metal reservoir is formed between the peripheral wall in the fitting hole portion and the outer peripheral surface of the tip portion of the connecting pipe, and the joint member is joined and integrated with the connecting pipe by the brazing filler metal in the brazing filler metal reservoir. Therefore, a large brazing area can be secured, and there can be formed a brazed portion having no leakage and excellent quality with good strength.

[Brief description of drawings]

FIG. 1A is a cross-sectional view showing a joint structure of an outlet pipe and a joint member, and FIG. 1B is a cross-sectional view taken along the line I-I of FIG.

FIG. 2 is a perspective view showing an outlet pipe and a joint member in a separated state.

FIG. 3 is a cross-sectional view showing a state in which a joint member is attached to a tip portion of an outlet pipe.

4 (a) to (e-1) are cross-sectional views showing a modified example of the joint structure between the outlet pipe and the joint member, and FIG. 4 (e-2) is a sectional view taken along line II-II of FIG. It is a line sectional view.

FIG. 5 (a) is an overall front view of the heat exchanger, and FIG. 5 (b) is a plan view of the same.

6 (a) and (b) are cross-sectional views showing a conventional joint structure of an outlet pipe and a joint member.

[Explanation of symbols]

 5 ... Outlet pipe (connection pipe) 7 ... Outlet joint member 13 ... Fitting hole 17 ... Brazing material reservoir 18 ... Brazing material

Claims (1)

[Claims] 1. A heat exchange medium inlet and / or outlet outlet connection pipe has a tip portion disposed in a fitting hole portion of a joint member in a forced fitting state and connected to a peripheral wall in the fitting hole portion. A heat exchanger characterized in that a brazing filler metal reservoir is formed between the outer peripheral surface of the tip portion of the pipe and the joint member is joined and integrated with the connecting pipe by the brazing filler metal in the brazing filler metal reservoir.