JPH0545336B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a laminated heat exchanger such as that used as an evaporator in a car cooler, and in particular to a multilayer heat exchanger that includes a plurality of plate-like tube elements forming heat exchange medium passages. The present invention relates to a method for manufacturing horizontal or vertical stacked heat exchangers that are stacked one above the other with an air flow gap between them that includes outer fins.

BACKGROUND TECHNOLOGY A well-known laminated heat exchanger is generally a combination of a pair of molded plates made of metal such as aluminum that are pressed to form heat exchange medium passages. A heat exchange core is formed by alternately stacking tube elements made of fins and outer fins made of corrugated fins, and a tank part for storing and distributing heat exchange medium is formed at both ends or one end of the core. Because it has advantages such as being able to easily follow fluctuations and having relatively excellent performance relative to its volume, it is particularly suitable for use as an evaporator for car coolers where installation space is severely restricted.

Conventionally, the core part of this type of laminated heat exchanger has been manufactured by
The molded plates in pairs, the outer fins installed between adjacent tube elements, and the inner fins installed in the evaporation chamber or heat exchange medium passage in the internal space of the tube elements are separated into pieces. After that, during assembly, they are stacked in a predetermined order, set, and joined together by furnace brazing or the like.

Problems to be Solved by the Invention However, when using the conventional manufacturing method as described above, since the stacked heat exchanger has an extremely large number of component parts, it is very difficult to manage the parts even at the pre-assembly stage. Not only that, but during assembly, many parts must be handled and assembled individually, which requires a lot of time and effort.
Furthermore, there were problems such as poor productivity and high costs.

Means for Solving the Problems In view of the above-mentioned problems, the present invention improves parts management by manufacturing a plurality of component parts as a cohesive unit and substantially reducing the number of parts. It is designed to facilitate the assembly process and to simplify and streamline assembly work.

That is, the present invention provides a laminated type heat exchange core portion in which a required number of stages of a heat exchange core portion is formed by alternately laminating a flat tube element in which a pair of molded plates are stacked together in a state of joining their peripheral edges and outer fins are laminated alternately. In a method for manufacturing a heat exchanger, at least one pair of molded plates constituting a tube element is molded, with an inner fin plate interposed between them, and one or more side edges of the three molded plates are interposed between them. Shall be molded into a series of juxtaposed expanded state connected via connecting pieces, and when assembling the core part, by bending the connecting pieces and overlapping both molded plates with the inner fin plate interposed between them, The gist of this invention is a method for manufacturing a stacked heat exchanger, which is characterized by assembling each unit tube element.

The number of parts to be formed in series through a connecting piece is one pair of molded plates forming one unit tube element, and one molded plate interposed between them.
The minimum number of three members including one inner fin plate is one unit, and the total number of molded plates and inner fin plates corresponding to the number of tube elements in the entire heat exchanger is the maximum. Due to administrative convenience, etc., in practice it is 1.
1 consisting of one or two tube elements
Preferably, the pair or two pairs of molded plates and one or two inner fin plates are molded as one piece.

Embodiments Embodiment 1 FIG. 3 shows a typical example of a laminated heat exchanger manufactured by applying the present invention. In the figure, 1 is a plurality of plate-shaped tube elements arranged horizontally in multiple stages in the vertical direction, and 2 is a plurality of plate-shaped tube elements interposed between adjacent tube elements 1 and 1, alternately stacked and joined together. 3 is the upper and lower end plate, 4, 5
are the inlet and outlet headers of the heat exchange medium.

As shown in FIG. 4, the tube element 1 includes a pair of molded plates 11, 11 each made of a metal plate such as an aluminum plate, and one inner fin plate 6 held between them. The fin portion 6a of the fin plate 6 is located in the flat tubular heat exchange medium passage furnace 7, and the passages are provided at both ends as shown in FIG. A tank portion 8 communicating with 7 is formed. 9 is a communication hole bored in the top wall of the tank part, 10 is a communication hole bored in the corresponding part of the inner fin plate 6, and these communication holes 9 and 10 allow the tank part 8 of the adjacent tube elements 1 and 1 to be connected to each other. , 8 are connected to each other in a joined state. The inner fin plate 6 has the same size and outer circumferential shape as the molded plate 11, and its peripheral edge is hermetically joined to the peripheral joint 12 of the molded plate 11 by brazing or the like, and this joint The fin portion 6a located in the inner heat exchange medium passage 7 surrounded by the heat exchange medium is formed with a large number of protrusions 6a in order to increase heat exchange efficiency. The protrusions 6b are arranged so that upwardly protruding U-shaped cross sections and downwardly protruding U-shaped cross sections are arranged continuously and alternately in the width direction of the intermediate plate 6. They are formed so as to be arranged alternately at a predetermined distance in the direction. Each of the protrusions 6b is opened with a rectangular hole on both sides in the width direction of the intermediate plate 6, and the protrusion height is such that the top surface of each of the protrusions 6b substantially abuts the upper and lower forming plates 11, respectively, in the completed state of the tube element 1. It is set to be approximately the same.

In manufacturing the laminated heat exchanger as described above, in the present invention, first, a pair of molded plates 11, 11 constituting a single tube element 1 are manufactured.
and one inner fin plate 6 sandwiched between these, as shown in FIG. Form into. This integrally molded product as shown in FIG.
Simultaneously with the forming operation, the connecting pieces 13 of a required length are left between adjacent forming plates and fin plates, thereby producing the fin plate all at once. Since the connecting piece 13 is bent when assembling the heat exchanger, it is provided with a notch or a V-shaped bent portion to facilitate bending at a predetermined bending portion. It is preferable to form it in advance.

When assembling the heat exchanger, the integrally molded product containing the pair of molded plates 11, 11 and the inner fin plate 6 molded as described above is bent as shown in FIG. Configured into a predetermined tube element assembly. That is, by sequentially bending the connecting pieces 13, the inner fin plate 6 is interposed between the pair of molded plates 11, 11, and the three are overlapped in a state of joining hands, thereby forming a single tube. element 1
form part.

Then, a plurality of tube element 1 assemblies obtained as described above are stacked on each other in a predetermined number of stages with outer fins 2 made of corrugated fins interposed therebetween, and the entire heat exchanger is temporarily assembled. The obtained product is then brazed according to conventional methods to form the desired laminated heat exchanger. Incidentally, after this joining is completed, the connecting piece 13 may be left as it is, or may be partially or completely cut off as necessary.

Example 2 This example is shown in FIGS. 4 and 5,
Care has been taken to prevent the connecting piece from protruding outward from the core part as much as possible.

That is, the tank portions 1 at both ends of the tube element
Approximately
A pair of molded plates 21, 21 and an inner fin plate 16 between them are formed by forming indented portions 14, 15 in the shape of a letter, and connecting pieces 23 are connected from the side edges of the indented portions 14, 15. and are connected in series.

The rest is the same as in the first embodiment, and equivalent parts and members are designated by the same reference numerals and their explanations will be omitted.

Effects of the Invention As described above, the present invention has a flat tube element in which a pair of molded plates are stacked together in a state of joining together at their peripheral edges, and an outer fin is alternately laminated to form a heat exchange core portion with a required number of stages. In the manufacturing method of the laminated heat exchanger, at least one pair of molded plates constituting a tube element are molded, with an inner fin plate interposed between them, and side edges of the three 1
It shall be formed into a series of unfolded and connected states connected through three or more connecting pieces, and when assembling the core part,
Since each unit tube element is assembled by bending the connecting piece and overlapping both molded plates with the inner fin plate interposed between them, first, each molded plate is assembled as in the conventional method. Compared to the case where they are manufactured separately, at least a pair of molded plates and an inner fin plate that constitute a single tube element can be handled as an integrated body.
The number of independent parts required for assembling the heat exchanger can be significantly reduced. Therefore, parts management becomes easier. Also, when assembling, compared to the conventional method where each individual tube element is assembled by overlapping individual molded plates through inner fins, the internal It is possible to obtain a precise assembly of tube elements with inner fins, and by stacking this assembly with outer fins as unitary parts, the entire heat exchanger assembly can be obtained. It is possible to reduce the effort and time required for the overall assembly. Therefore, productivity can be improved and manufacturing costs can be further reduced than in the past. Furthermore,
In the heat exchanger according to the present invention, the peripheral edge portion of the inner fin plate is interposed between the peripheral edge joint portion of the two molded plates of the tube element, and this is continuous with the inner fin portion inside, so that the inner fin plate is connected to the tube element. It also has the effect of reinforcing the element and contributing to improving the pressure resistance of the heat exchanger.

[Brief explanation of the drawing]

1 to 5 show a first embodiment of the present invention, in which FIG. 1 is a perspective view showing the assembled state of the heat exchanger core, and FIG. 2 shows a pair of molded plates and an inner FIG. 3 is a front view of the heat exchanger after assembly; FIG. 4 is a cross-sectional view taken along the line shown in FIG. 3; and FIG. 5 is the heat exchanger core. It is a sectional view of the tank part in . 6 and 7 show a second embodiment, and are a plan view and a perspective view corresponding to FIG. 2 and FIG. 1, respectively. 1...Tube element, 2...Outer fin, 6, 16...Inner fin plate, 6
a... Fin part, 8... Tank part, 11, 21...
... Molding plate, 13, 23... Connection piece.

Claims (1)

[Scope of Claims] 1. A laminated structure in which a heat exchange core portion with a required number of stages is formed by alternately laminating a flat tube element in which a pair of molded plates are stacked in a state of folding their hands together and their peripheral edges are joined together, and an outer fin. In a method for manufacturing a molded heat exchanger, at least one pair of molded plates constituting a tube element is molded, with an inner fin plate interposed between them, and one or more side edges of the three molded plates are interposed between them. When assembling the core part, by bending the connecting pieces and overlapping both molded plates with the inner fin plates interposed between them, , a method for manufacturing a laminated heat exchanger, characterized in that each unit tube element is assembled. 2. An indentation is formed on the side edges of both ends of the molded plate and the inner fin plate so that the tank portions at both ends of the tube element are narrower than other portions, and the connection piece is attached to the side edge inside the indentation. 2. The method of manufacturing a laminated heat exchanger according to claim 1, wherein a molded plate and an inner fin plate are connected to each other by providing a molded plate and an inner fin plate that are adjacent to each other.