JPH0429957B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat exchanger used, for example, in a water-cooled condenser of an air conditioner or an evaporator for a chiller.

Structure of a conventional example and its problems FIG. 1 is a perspective view of the entire stacked heat exchanger. A large number of grooved flat plates 1 are stacked, and end plates 2 are stacked on both sides of the flat plates 1 to prevent fluid from leaking from the grooves.
It has a structure in which the end plates 2 are brought into close contact with each other, and a fluid inlet/outlet pipe 3 is attached. FIG. 2 is a perspective view showing an example of the flat plate 1. FIG. Note that this is an example used for heat exchange between two fluids. Fluid flowing in through the inlet/outlet pipe 3 enters the header 4, is divided into grooves 5, and flows out. Then, it is collected at the other header 4 and flows out from the heat exchanger. 6 is a header for the fluid to be heat exchanged, and by rotating the flat plates 1 by 90 degrees and stacking them, a structure is created in which a different fluid flows through each plate. Therefore, the groove part 5 becomes a heat exchange part, which exchanges heat with both the upper and lower two fluids.

Although the groove portion 5 is shown as a flat surface in FIG. 2, it has been proposed to provide a convex portion in order to promote electric heating. FIG. 3 shows an example of this, and is an enlarged sectional view of the groove portion 7. Convex portions 8 are provided within the groove portions 7, and the concave portions 9 formed between the convex portions 8 produce a heat transfer promoting effect due to the influence of surface tension in secondary flow or two-phase flow.

However, when producing such unevenness by etching, it is necessary to perform so-called two-stage etching, in which the flat plate 10 is first etched over the entire groove 5 to the height A, then the area where the protrusion 8 is to be formed is masked, and then etched again. . Two-stage etching not only takes time, but also has the drawback of poor dimensional accuracy.

OBJECTS OF THE INVENTION It is an object of the present invention to shorten manufacturing time and increase dimensional accuracy in a laminated heat exchanger having a relatively complicated cross-sectional shape.

Structure of the Invention The present invention provides a first
and a second flat plate having recesses formed in the portions overlapping with the plurality of holes of the first flat plate to form a flow path for heat exchange fluid by the plurality of holes and recesses, 2 such that the flow path of the heat exchange fluid is located on one side or both sides of the flow path of the heat exchange fluid.
A plurality of channels are stacked alternately.

DESCRIPTION OF EMBODIMENTS FIG. 4 is an enlarged view of one flow path in a stacked heat exchanger according to an embodiment of the present invention. Channel 1
1 is two thin second flat plates 12 and first flat plate 13
formed by The second flat plate 12 is etched over the entire groove 11, and can be manufactured by one etching. The first flat plate 13 has a plurality of through holes 14 arranged in parallel. By sequentially stacking the second flat plate 12 and the first flat plate 13, a cross section exactly the same as that of the conventional example shown in FIG. 3 is obtained. Second flat plate 12 and first flat plate 13
In both cases, two-stage etching is not required during manufacturing, and since the thickness is reduced, the etching time is shortened and dimensional accuracy is improved. The first flat plate 13 can also be manufactured by machining such as pressing.

FIG. 5 shows another embodiment of the invention. In this case, the second flat plate 12 in FIG. 4 is made up of two flat plates 15 and 16. The flat plate 18 is provided with a through hole. The flat plate 15 is formed by a hole passing through the entire groove portion 17. The flat plate 16 is a plate in which the entire groove portion 17 is not processed. The groove portion can be formed by stacking the flat plates 15, 18, and 16 as shown in the figure. That is, the same groove shape as shown in FIG. 4 can be obtained by the flat plates 15, 18, and 16. Further, all of the flat plates 15, 16, and 18 can be machined by pressing or the like. Even in the case of manufacturing using etching, two-stage etching is unnecessary as in the embodiment shown in FIG. 4, and a highly accurate heat exchanger can be manufactured in a short time.

FIG. 6 shows a plan view of the first flat plate 13 used in FIG. 4. 21 is a header for the fluid to be heat exchanged. Hole 4 is formed in a slit shape,
The end portion 19 corresponds to the header during lamination, and the center portion 2
0 corresponds to the flow path. As a result, the flow path shown in FIG. 4 is easily formed. This first flat plate 13
are stacked together with the second flat plate 12 shown in FIG. 4 while being rotated by 90° depending on each heat exchange fluid to form a heat exchanger. Note that a heat exchanger can be formed in the same manner when the second flat plate shown in FIG. 4 is constructed by the unprocessed flat plate 16 shown in FIG. 5 and the flat plate 15 having a through hole.

Effects of the Invention According to the present invention, it is possible to manufacture a laminated heat exchanger in which irregularities are provided in the flow path in order to obtain a heat transfer promoting effect in a short manufacturing time and with high dimensional accuracy.

[Brief explanation of drawings]

Figure 1 is an overall perspective view of the stacked heat exchanger, Figure 2
The figure is a perspective view of the flat plate constituting the heat exchanger shown in Figure 1, and Figure 3 is a cross-sectional view of the heat exchanger flow path currently being proposed.
4 and 5 are cross-sectional views of flow paths in a heat exchanger according to an embodiment of the present invention, and FIG. 6 is a plan view of a flat plate having holes. 11...Groove portion, 12...Second flat plate, 13...
First flat plate, 14...holes.

Claims (1)

[Scope of Claims] 1. A first flat plate having a plurality of through holes in parallel, and a second flat plate having a recess formed in a portion that overlaps the plurality of holes in the first flat plate when laminated, and A heat exchange fluid flow path is formed by a plurality of holes and recesses, and a plurality of two flow paths are alternately stacked so that the heat exchange fluid flow path is located on one side or both sides of the heat exchange fluid flow path. laminated heat exchanger. 2. The stacked heat exchanger according to claim 1, wherein the second flat plate is made of a flat plate without holes and a flat plate with through holes, and a recess is formed when stacked. 3. The laminated heat exchanger according to claim 1 or 2, wherein the through hole is a slit extending to a header portion communicating with an inlet/outlet of the heat exchanger.