JPH05149692A - Heat exchanger - Google Patents

Abstract

PURPOSE:To improve a manufacturing efficiency by a method wherein a base end part of an inlet connecting pipe is inserted into an insertion hole of a header, a central axis of the base end part is inclined in respect to a vertical axis of the insertion hole by a weight of the connecting pipe, the base end is engaged with and supported by a circumferential wall of the hole and the connecting pipe and the header are brazed under their appropriate assembled condition. CONSTITUTION:An intermediate straight pipe part 4b and an extreme end part straight pipe 4c of a refrigerant inlet connector pipe 4 are arranged at a core (c) as shown in an imaginary line at an intermediate assembly of a heat exchanger while being laid down and then a straight pipe 4a at its base end is inserted into an insertion hole 9 of the header 3. The straight pipe 4a at the base end is provided with an opposing circumferential wall to be slit and then a pair of engaging remained circumferential walls 4d and 4d. The remaining circumferential walls 4d and 4d are inserted into and arranged at a clearance of the tube 1 under their adapted states. An operator's hand is moved away from the connecting pipe 4, its own weight acting is applied, resulting in that the straight pipe 4a at the base end becomes a proper state in which it is raised vertically with respect to the core C and it is brazed while its state being kept.

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, as shown in FIG. 3, both ends of a plurality of tubes (1) are connected to a pair of hollow headers (3) (3) in a communicating state, and a gap between the tubes (1). A so-called multi-flow type heat exchanger having a basic configuration in which fins (2) ... Are arranged in the heat exchanger is preferably used as a heat exchanger that can achieve high heat exchange efficiency, low pressure loss, and ultra compactness. There is a tendency.

This heat exchanger is generally manufactured by combining the heat exchanger constituent members such as the tube (1), the header (3) and the fins (2) as described above in a mutually temporary assembled state. This is performed by manufacturing an assembly and integrally joining and integrally joining these heat exchanger constituent members by brazing in a furnace.

By the way, in the header (3) of the heat exchanger having the above-described structure, the bases of the connection pipes (4) and (5) for the refrigerant inlet and outlet for circulating the refrigerant to the internal passage of the heat exchanger. The ends are connected in communication. Then, as shown in FIG. 4, the header (3) and the connecting pipe (4) are joined to each other by inserting the base end portion of the connecting pipe (4) into the insertion hole ( It is general that they are assembled in a state of being inserted and arranged in 51), and in this assembled state, they are joined and integrated together by the above-mentioned collective brazing.

And, conventionally, the connection pipe (4) is assembled by
Due to the gap between the insertion hole (51) of the header (3) and the base end of the connecting pipe (4), the connecting pipe (4) has its own weight as shown in FIG. 4 (b). For the purpose of preventing the connection pipe (4) from being inclined due to, for example, the intermediate portion of the connection pipe (4) is supported by the jig (52) so that the connection pipe (4) has a predetermined proper posture. It was supposed to be kept in the assembled state.

[0006]

However, as described above, in the method of holding the connecting pipe (4) in a predetermined assembled state using the jig (52), the assembling work of the heat exchanger assembly is performed. The work efficiency of the heat exchanger becomes low, and the jig removing work is required after the brazing, resulting in a decrease in the manufacturing efficiency of the heat exchanger.

The present invention eliminates the above-mentioned conventional drawbacks, and the connection pipe can be assembled to the header in a proper state without using a jig, and the manufacturing efficiency can be improved. The purpose is to provide an exchanger.

[0008]

To achieve the above object, the present invention has a hollow cylindrical header in which a plurality of tubes are connected in a communicating state, and an insertion hole formed in a peripheral side wall of the header, In the heat exchanger in which the base end of the connection pipe for the heat exchange medium inlet or the outlet is inserted, the central axis of the connection pipe base end is inclined with respect to the vertical axis of the insertion hole due to the weight of the connection pipe. The connecting pipe base end is engaged with and supported by the peripheral wall of the insertion hole by brazing, and in the engaged and supported state, both are brazed so that the connecting pipe is joined and integrated with the header in a predetermined arrangement state. The gist is a heat exchanger characterized by that.

[0009]

In the above construction, the central axis of the base end of the connecting pipe is inclined with respect to the vertical axis of the insertion hole by the weight of the connecting pipe, so that the base end of the connecting pipe engages the peripheral wall of the insertion hole. Since they are integrally supported, the connecting pipe is autonomously held in a proper assembled state by this engagement supporting action. Therefore, the use of a jig for assembling the connecting pipe can be eliminated.

[0010]

EXAMPLES Next, examples in which the present invention is applied to a multi-flow type aluminum condenser for a car cooler will be described. It is needless to say that the present invention can be widely applied to heat exchangers for various uses such as heat exchangers for room air conditioners and oil coolers.

In the heat exchanger shown in FIG. 3,
(1) is a flat tube, (2) is a corrugated fin,
These are arranged in parallel in a vertical direction and alternately form a heat exchanger core (C). (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 a connection pipe for the refrigerant inlet,
(5) is the outlet connecting pipe.

Reference numeral (6) 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. (7)
Reference numeral (7) denotes a side plate, which is arranged outside the upper and lower outermost corrugated fins (2) and (2) to protect the corrugated fins.

The flat tube (1) is made of an extruded aluminum material, and as shown in FIG. 2, the interior is divided into a plurality of chambers by partition walls to improve pressure resistance and so on. It is a harmonica tube. In addition,
An electric resistance welded pipe may be used regardless of the extrusion mold material.

The corrugated fin (2) is formed by forming a sheet material into a corrugated shape and cutting and raising the louver.
An aluminum brazing sheet in which a brazing material layer is clad is used as this sheet material.

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. Tube insertion holes (3c) for inserting the ends of the tube (1) are arranged in a row on the peripheral side of the header (3).

The inlet connecting pipe (4) is made of an aluminum extruded pipe. As shown in FIGS. 2 and 3, the tip joint portion (8) is connected to the heat exchanger core (C). A straight pipe on the proximal end side connected to the peripheral side wall of the header (3) in a manner of standing up from the header (3) at right angles to the core surface (C) so as to be arranged downward at a predetermined distance from the core (3). A part (4a), an intermediate straight pipe part (4b) continuous to the tip of the straight pipe part (4a) orthogonally thereto and extending toward the heat exchanger core (C) side, and the intermediate straight pipe. It is formed into a three-dimensional shape having a tip-side straight pipe portion (4c) which is continuous with the tip of the portion (4b) orthogonally thereto and which extends downward while maintaining a predetermined distance from the core (C). ing.

Further, at the base end portion of the base end side straight pipe portion (4a),
As shown in FIG. 1, peripheral wall portions facing each other are cut out, and a pair of remaining peripheral wall portions for engagement (4d) (4d) formed by the both cutouts are inserted into the tube of the header (3). The tube (1) inserted in the hole (3c) is adapted to be inserted and arranged in the gap between the tubes (1) and (1). As the connecting pipe (4), a brazing filler metal clad pipe made of aluminum such as an electric braided pipe made of aluminum brazing sheet may be used.

The peripheral wall of the header (3) is provided with an insertion hole (9) into which the proximal end of the inlet connection pipe (4) is inserted. The formation position of this insertion hole (9) is determined as follows. That is, the base end portion of the inlet connection pipe (4) is inserted into the insertion hole (9). In the inserted state, the base end side straight pipe portion (4a) is caused due to the gap between the two. Is in a state where its central axis can be inclined with respect to the vertical axis of the insertion hole (9). Moreover, due to the effect of the total weight of the connecting pipe (4), the proximal straight pipe portion (4a)
Is inclined toward the core (C) side, and in a specific inclination state,
The base end portion of the connecting pipe (4) is engaged with the peripheral wall of the insertion hole (4), and the tilting movement is further restricted. The insertion hole (9) is located at such a position that the base end side straight pipe part (4a) is in a standing state orthogonal to the core in this tilt restricted state, that is, from the front surface position of the peripheral side wall of the header (3). It is set at a predetermined specific position eccentric to the anti-core side.

In manufacturing the heat exchanger, first, the above-mentioned heat exchanger constituent members are assembled in a temporary 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. By inserting the ends of the tubes (1) into the holes (3c), the tubes are fitted and the corrugated fins (2) are inserted and arranged between the tubes (1). In addition, the partition member (6), the side plates (7) and (7), the outlet connection pipe (5), and the like are assembled.

At the same time, the inlet connecting pipe (4) is assembled. That is, in the heat exchanger intermediate assembly that has been laid down and laid down, as shown by the phantom line in FIG. 1 (a), the intermediate straight pipe portion (4b) and the tip end side of the inlet connection pipe (4). The base end of the connecting pipe (4) is inserted into the insertion hole (9) of the header (3) by a predetermined length such that the straight pipe portion (4c) is arranged on the core (C) side. At the time of this insertion, the pair of remaining peripheral wall portions for engagement (4d) provided at the base end portion of the connecting pipe (4) are inserted and arranged in the gap of the tube (1). As a result, rotation of the proximal end side straight pipe portion (4a) around its own axis is restricted. And
In that state, the weight of the connecting pipe (4) is exerted. Due to the action of this self-weight, the proximal end side straight pipe part (4a) becomes
The base end of the connecting pipe (4) is tilted to the side, and in the process, the base end side straight pipe part (4a) reaches a proper state where it is planned to rise vertically to the core (C). The portion is engaged with the peripheral wall of the insertion hole (9), and further tilting movement is restricted. As a result, as shown by the solid line in FIG. 1 (a), the core (C) is placed in an orthogonal rising state and held in that state. Therefore, the connecting pipe (4) can be assembled in an assembled state of proper arrangement without supporting by a jig. In this state, the central axis of the proximal straight tube portion (4a) is inclined with respect to the vertical axis of the insertion hole (9).

After that, the heat exchanger assembly is placed in a furnace in a lying state, and is brazed and integrally joined as a whole. By this brazing, the inlet connection pipe (4) is brazed to the header (3). The brazing material for brazing the connecting pipe (4) and the header (3) may be supplied from the brazing material layer of the header, or may be brazed by placing brazing. .. As a result, the connecting pipe (4) is joined and integrated with the header in a predetermined proper arrangement state without using a jig. From the above, a heat exchanger is manufactured.

In the above embodiment, the connecting pipe assembling structure of the present invention is applied only to the inlet connecting pipe due to its nature, but only to the outlet connecting pipe (4), or It goes without saying that it may be applied to both the inlet connection pipe (4) side and the outlet connection pipe (5) side.

[0023]

As described above, according to the heat exchanger structure of the present invention, the central axis of the base end portion of the connecting pipe is inclined with respect to the vertical axis of the insertion hole by the weight of the connecting pipe. Since the base end portion of the connecting pipe is engaged with and supported by the peripheral wall of the insertion hole so that the connecting pipe can be assembled in the proper arrangement state, the connecting pipe assembling jig can be eliminated. Can be efficiently assembled, and the removal of the jig after brazing can be omitted, and the heat exchanger manufacturing efficiency can be improved.

[Brief description of drawings]

FIG. 1 shows a state in which a refrigerant inlet connection pipe is assembled to a header. FIG. 1 (a) is a cross-sectional view of the header, and FIG.
FIG. 3 is a vertical sectional view of a header.

FIG. 2 is a perspective view showing a state in which a refrigerant inlet connection pipe is assembled to a header.

FIG. 3 (a) is an overall front view of the heat exchanger, and FIG. 3 (b) is a side view of the same.

4A and 4B show a conventional assembled state of a connecting pipe, in which FIG. 4A is a partial sectional perspective view, and FIG. 4B is a header transverse sectional view.

[Explanation of symbols]

 1 ... Tube 3 ... Header 4 ... Refrigerant inlet connection tube 9 ... Insertion hole

Claims (1)

[Claims] 1. A connecting pipe for a heat exchange medium inlet or outlet, which has a hollow cylindrical header in which a plurality of tubes are connected in a communicating state, and is inserted into an insertion hole formed in a peripheral side wall of the header. In the heat exchanger with the base end part of the connection pipe inserted, the base end part of the connection pipe is made to be in a state in which the central axis of the connection pipe base end is inclined with respect to the vertical axis line of the insertion hole by the weight of the connection pipe. A heat exchanger characterized in that it is engaged and supported by the peripheral wall of the insertion hole, and in the engaged and supported state, both are brazed and the connecting pipe is joined and integrated with the header in a predetermined arrangement state.