JPH03225197A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent the separation of a brazed part and permit the thinning of respective members by a method wherein one part of the second closely contacting part of a side plate is fixed to the third wall of a header plate by pinching and the folded pinching wall is brazed to the second closely contacting part while expansion and contraction due to high-temperature fluid in a heat exchanging tube is absorbed by a bent part for absorbing the expansion and contraction. CONSTITUTION:One part of the second closely contacting part 15 of a side plate 5 is pinched together with a third wall so as to be continuous to the end of the header tank main body 7 side of the third wall 8c of a header plate 2 while a folded pinching wall 16, brazed to the second closely contacting part 15, is provided whereby brazing strength between the header plate 2 and the side plate 5 is increased. On the other hand, an expansion and contraction absorbing bent part 17, separated from a first wall 8a and a corrugate fins, is provided between the first closely contacting part 14 and the corrugate fins 4 and, further, another expansion and contraction absorbing bent part 18, separated from a second wall 8b and the corrugate fins, is provided between the second closely contacting part 15 of the side plate 5 and the connecting part of the corrugate fins 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a heat exchanger used in automobile radiators, heaters for heating devices, and the like.

BACKGROUND ART For example, conventionally, an automobile radiator has two header plates that are parallel to each other and have protrusions at both ends of opposing surfaces that protrude toward the other side, and a header plate that is fixed to the outside of both header plates. a header tank body, a plurality of heat exchange tubes arranged between both header plates at right angles to the header plate and parallel to each other, and both ends of which are joined to the header plate; The corrugated fins are placed outside the heat exchange tubes at both ends and are connected to the heat exchange tubes, and the corrugated fins are placed outside the corrugated fins at both ends and are connected to the header plate at both ends. The projecting part of the header plate has a U-shaped cross section that opens toward the header tank main body side, and a first side plate that extends from both ends of the header plate to the other header plate side. A wall, a second wall that extends outward from the tip of the first wall, and a third wall that extends toward the header tank body from the tip of the second wall, and both ends of each side plate are three walls. It is divided into the above parts, and a first close contact part that is in close contact with the first wall and an L-shaped second close contact part that is in close contact with the second wall and the third wall are provided alternately. It is known that a side plate is joined to a header plate with a first close contact portion in close contact with a first wall and a second close contact portion in close contact with a second wall and a third wall. (Jitsukai 61-15
(See Publication No. 4480).

In such a heat exchanger, the header plate, heat exchange tubes, corrugated fins, and side plates are brazed together.

Problems to be Solved by the Invention However, in the case of the above-mentioned conventional heat exchanger, when each member is made thinner in order to meet the demand for a lighter heat exchanger, sufficient clearance between the side plate and the header plate is required. The problem is that the above-mentioned wax bone part peels off when the attachment strength is not obtained and the tube expands in the length direction when high-temperature fluid is passed through the heat exchange tube, and contracts when the flow of high-temperature fluid is stopped. There is.

An object of the present invention is to provide a heat exchanger that solves the above problems.

Means for Solving the Problems A heat exchanger according to the present invention includes two header plates that are parallel to each other and have protrusions on both ends of opposing surfaces that protrude toward the other side, and on the outside of both header plates, respectively. A fixed header tank body, a plurality of heat exchange tubes arranged between both header plates at right angles to the header plate and parallel to each other, and both ends of which are joined to the header plate, and adjacent heat exchange tubes. A corrugated fin that is placed between the two and on the outside of the heat exchange tube at both ends and is joined to the heat exchange tube, and a corrugated fin that is placed outside of the corrugated fin on both ends and that is joined to the header plate at both ends. 2 joined to
The projecting portion of the header plate has a U-shaped cross section that opens toward the header tank main body side, and a first wall that is continuous with both ends of the header plate and extends toward the other header plates. Consisting of a second wall that extends outward from the tip of the wall, and a third wall that extends toward the header tank body from the tip of the second wall, both ends of each side plate have three or more parts. A first close contact portion that is divided into close contact with the first wall and an L-shaped second close contact portion that is in close contact with the second wall and the third wall are alternately provided, and the first close contact portion is provided alternately. is close to the first wall, and the second
In a heat exchanger in which the side plate is joined to the header plate with the close contact portion of the side plate being in close contact with the second wall and the third wall, the side plate is connected to the end of the third wall of the header plate on the header tank body side. A folded clamping wall is provided which clamps a part of the second close contact portion of the side plate together with the third wall and is brazed to the second close contact portion, and is connected to the first close contact portion of the side plate. 1st between the joint part to the corrugated fin
A stretch absorbing bend spaced apart from the wall and the corrugated fin is provided, and a stretch absorbing bend spaced apart from the second wall and the corrugated fin is provided between the second close portion of the side plate and the joining portion to the full gate fin. A bending section for absorbing expansion and contraction is provided.

Effect According to the above configuration, the third wall of the header plate is connected to the end of the header tank main body side, and a part of the second close contact portion of the side plate is sandwiched together with the third wall, and the second Since the folded clamping wall is provided in the close contact portion, the brazing strength between the spacing plate and the side plate is increased. Further, an expansion/contraction absorbing bending portion is provided between the first close contact portion of the side plate and the joining portion to the corrugated fin, and the bending portion is spaced apart from the first wall and the corrugated fin, and a second close contact portion of the side plate is provided. An expansion absorbing bend spaced apart from the second wall and the corrugated fins is provided between the section and the joint to the corrugated fins, so that the lengthwise increase due to the flow of hot fluid in the heat exchange tubes is Expansion and contraction are absorbed by the two expansion and contraction absorption bending parts.

Example Embodiments of the present invention will be described below with reference to the drawings.

In the following explanation, the word "aluminum" refers to
In addition to pure aluminum, aluminum alloys are included.

A heat exchanger according to the invention is shown in FIGS. 1-4. In Figures 1 to 4, the heat exchanger (1) consists of two aluminum header plates (2) arranged vertically at a predetermined interval and parallel to each other, and a header plate between the two header plates (2). A plurality of aluminum flat heat exchange tubes (3) are arranged at right angles to the plate (2) and parallel to each other, and both ends are joined to the header plate (2), and adjacent heat exchange tubes ( 3) Aluminum corrugated fins (4) with louvers placed between them and on the outside of the heat exchange tubes (3) at both ends and joined to the heat exchange tubes (3), and corrugated fins (4) at both ends. an aluminum side plate (5) arranged on the outside of the header plate (2) and joined to the corrugated fin (4), and mechanically fixed to the header plate (2) and together with the header tank (6) and a plastic header tank body (7).

Projections (8) projecting toward the other side are formed on the peripheral edges of the mutually opposing surfaces of both header plates (2). The protrusion (8) has a U-shaped cross section that opens toward the header tank main body (7), and has a first wall (8) that extends from the periphery of the header plate (2) toward the other header plate (2).
8a), a second wall (8b) connected to the tip of the first wall (8a) and extending outward; and a third wall connected to the tip of the second wall (8b) and extended toward the header tank body (7). Wall of(
8c). In addition, the three walls (8a) of the protrusion (8)
) (8b) By (8C), the header tank body (
A concave groove (9) into which the flange (7a) provided at the periphery of the opening of 7) fits is provided over the entire circumference. Among the protrusions (8), those present on the shorter sides of the header plate (2) serve as joining protrusions (8A) to be joined to both ends of the side plate (5).

At the center of the length of the third wall (8c) of the protrusion (8^), there is a side plate (described later) that is continuous with the end on the header tank body (7) side and is connected to the third wall (8c). 5
) is provided with a folded clamping wall (16) which clamps the vertical part of the second close contact part (15). The header plate (2) also has heat exchange tube insertion holes (11
) are formed. A flange (12) is formed at the periphery of the heat exchange tube insertion hole (11) on the surface of the header plate (2) to which the header tank body (7) is attached.

With both ends of the heat exchange tube (3) in close contact with the inner peripheral surface of the flange (12), connect the header plate (2) and the heat exchange tube (3).
The points are brazed. Although the drawing shows a case in which one row of heat exchange tubes is provided, which is made up of a plurality of heat exchange tubes arranged at predetermined intervals in the left and right direction, the present invention is not limited to this. A plurality of heat exchange tube rows each including a plurality of heat exchange tubes arranged at predetermined intervals may be provided in the front and back.

The side plate (5) has a U-shaped cross section and a web portion (5a
) and a flange portion (5b), and is arranged with its opening facing outward. In the web part (5a),
A reinforcing rib (13) extending in the vertical direction is formed. Both upper and lower ends of the web portion (5a) are flange portions (5b).
This protrusion is divided into three parts, with the first wall (8a) of the protrusion (8A) on both sides.
) is provided, and an L-shaped second contact portion (15) is provided in the center that is in close contact with the second wall (8b) and the third wall (8c). It is being The first close contact portion (14) is in close contact with the first wall (8a), and the second close contact portion (15) is in close contact with the second wall (8a).
8b) and the third wall (8c), and the vertical part of the second close contact portion (15) is sandwiched between the third wall (8c) and the folded clamping wall (16). , these parts are brazed together. In addition, the side plate (5
) and the first close part (14) of the corrugated fin (4)
An expansion/contraction absorbing bent portion (17) is provided between the joint portion and the first wall (8a) and the corrugated fin (4). side brake) (5)
between the second close part (15) of the and the joining part to the corrugated fin (4), a stretch-absorbing bend (separated from the second wall (8b) and the corrugated fin (4)
18) is provided.

In the header tank body 7), the flange (7a) is inserted into the groove (9) via the O-ring (19), and the flange (7a) is inserted into the groove (9).
the outer peripheral side wall of the projection (8), i.e. the third wall (8c) of the protrusion (8).
The flange (7a) is fixed to the header plate (2) by being pressed by a plurality of inwardly folded portions (20) formed at predetermined intervals in the length direction. The inward folding part (20) is formed by the third wall (8C) of the groove (9).
) is formed by bending inward protrusions that are provided at predetermined intervals in the length direction and extend in the height direction of the wall (8C).

The heat exchanger (1) is manufactured as follows.

First, after arranging the heat exchange tubes (3), corrugated fins (4), and side plates (5) in a stacked manner, insert both ends of each heat exchange tube (3) into the header plate (2). Insert it into the hole (11) and bring it into close contact with the flange (12). In addition, the first close portion (14) of the side plate (5)
) is brought into close contact with the first wall (8a), and the second contact portion (15) is brought into close contact with the second wall (8b) and the third wall (8a).
C), and further, the vertical part of the second close contact portion (15) is sandwiched between the third wall (8C) and the folded sandwiching wall (16). At this time, each heat exchange tube (3) bends slightly, and the middle part of the length of the heat exchange tube (3) located at both ends thereof is bent outward, and the heat exchange pipe (3) located at both ends thereof bends outward. Corrugated fins on the outside of the heat exchange tube (3) (
4) curves outward. Therefore, the side plate (
5) is also pushed outward, and its protrusion (5C) is firmly pressed against the protrusion (8A) of the header plate (2),
The side plate (5) is prevented from coming off, and the heat exchange tube (3) and the corrugated fin (4) are also prevented from falling off by the side plate (5).

Then, with the jig arranged to fix both header plates (2), the header plate (2) and the heat exchange tube (
3) Simultaneously join the heat exchange tubes (3) and corrugated fins (4), the header plate (2) and side plates (5), and the corrugated fins (4) and side plates (5), respectively.

Finally, attach the flange (7a) of the header tank body (7).
Fit the main body (7) into the header plate (2) by fitting it into the groove (9) of the header plate (2) through the O-ring (19).
An inward folded portion (20) is formed on the third wall (8c) in a state in which it is pressed to the side, and the header tank body (7) is fixed to the header plate (2) to form a header tank (6).

In this way, the heat exchanger (+) is manufactured.

In the above embodiment, both ends of the side plate (5) are divided into three parts, with the first close contact part (I4) on both sides.
), and an L-shaped second close contact portion (I5) that is in close contact with the second wall (8b) and the third wall (8c) is provided in the center, but both close contact portions (14) The number of (15) is not limited to this.

In addition, in the above, the header plate (2) and the heat exchange tube (3), the heat exchange tube (3) and the corrugated fin (4)
The corrugated fins (4) and the side plates (5), and the header plate (2) and the side plates (5) are brazed by various known methods.

Effects of the Invention According to the heat exchanger of the present invention, the brazing strength between the header plate and the side plate is increased as described above. Moreover, the expansion and contraction in the length direction due to flowing high temperature fluid into the heat exchange tube is absorbed by the two expansion and contraction absorbing bent parts. Therefore, it is possible to prevent peeling from occurring in the wax portion of the header plate of the side plate, and it is possible to reduce the thickness of each member in order to meet the demand for reducing the weight of the heat exchanger. Furthermore, it is possible to easily accurately position the side plate for brazing with respect to the header plate, and to prevent the side plate from shifting during brazing.

[Brief explanation of drawings]

The drawings show an embodiment of the heat exchanger of the present invention, in which Fig. 1 is a partially enlarged perspective view with a part cut away, Fig. 2 is a partially enlarged side view, and Fig. 3 is a cross section taken along the line ■-■ in Fig. 2. 4 are partially cutaway perspective views showing the overall configuration. (1)...Heat exchanger, (2)...Header plate,
(3)...Heat exchange tube, (4)...Corrugated fin, (5)...Side plate, (8^)...Protrusion, (8a)...First wall, ( 8b) - Second wall, (8c) - Third wall, (14) Third close part, (15) Second close part, (16) Folded clamping Wall, (17) (1g)...Bending part for expansion and contraction absorption. that's all

Claims (1)

[Claims] Two header plates that are parallel to each other and have protrusions that protrude toward the other side at both ends of opposing surfaces, a header tank body fixed to the outside of both header plates, and both header plates. A plurality of heat exchange tubes are arranged between the header plates at right angles to the header plate and parallel to each other, and both ends are joined to the header plate, and heat exchange between adjacent heat exchange tubes and at both ends. A corrugated fin placed on the outside of the tube and joined to the heat exchange tube, and two side plates placed outside the corrugated fin at both ends, both ends of which are joined to the header plate and joined to the corrugated fin. A first wall having a U-shaped cross section with a protruding portion of the header plate opening toward the header tank main body and extending toward the other header plates in a row at both ends of the header plate;
Consisting of a second wall that extends outward from the tip of the wall, and a third wall that extends toward the header tank body from the tip of the second wall, both ends of each side plate have three or more parts. A first close contact portion that is divided into close contact with the first wall and an L-shaped second close contact portion that is in close contact with the second wall and the third wall are alternately provided, and the first close contact portion is provided alternately. In a heat exchanger in which the side plate is joined to the header plate with the side plate being in close contact with the first wall and the second close contact portion being in close contact with the second wall and the third wall, A folded clamping wall is connected to the end of the wall on the side of the header tank main body, clamps a part of the second close contact part of the side plate together with the third wall, and is brazed to the second close contact part. a first contact portion between the first close portion of the side plate and the joining portion to the corrugated fin;
A stretch absorbing bend spaced apart from the wall and the corrugated fin, and spaced from the second wall and the corrugated fin between the second close portion of the side plate and the joining portion to the corrugated fin. A heat exchanger equipped with a bending section for absorbing expansion and contraction.