JPS6155584A - Laminated heat exchanger - Google Patents

Abstract

PURPOSE:To prevent leakage of fluid and the leakage between the outside part of a heat exchanger and the fluid without deformation of the groove in the heat exchanger by a method wherein the shape of a part of one flat plate contacting with an end plate having no inlet or outlet port of flat plates having layered grooves and the punched parts is varied. CONSTITUTION:Grooves of which ends are connected with the first punched part, two or more first flat plates 1a and 1b having second punched parts separated from said grooves, and grooves are provided and further the second flat plate 1a having not punched parts and the end plate 2a are arranged. Then, the first flat plates are overlapped to each other to form a layered body having a plurality of independent and separate flow passages having the grooves connected to each other. The second flat plates 1a' are arranged with their grooves sides being directed toward said layered body to cause the end plate 2a to be integrally formed with the layered body. Therefore, two types of fluids are not contacted directly with between the surface having no grooves of the flat plate 1a' having a large connection area and the end plate 2a, so that it is possible to prevent a leakage of two fluids and a leakage between the two fluids and the outside part of the heat exchanger.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to industrial applications such as air conditioning, refrigeration, solar heat utilization, food processing,
This invention relates to a laminated heat exchanger that mainly handles heat exchange between liquid-liquid or gas-liquid (phase flow-liquid) in the field of heat utilization such as the chemical industry.

Structure of the conventional example and its problems FIG. 1 is an overall view of a laminated heat exchanger. A large number of flat plates 1 provided with grooves 5 and cutouts 6 are stacked, and end plates 2 thicker than the flat plates for reinforcing pressure resistance and attaching inflow and outflow pipes are stacked on both sides, so that fluid does not leak out from the grooves 5. It has a structure in which two types of flat plates 1a and 1b are alternately stacked, end plates 2 are closely joined to the ends thereof, and fluid inlet/outlet pipes 3 are attached. FIGS. 2 and 3 are views showing examples of flat plates, and show two types of flat plates 1a and 1b with different shapes of grooves and cutouts 4 and 6. This is an example used for heat exchange between two fluids, where the fluid that flows into the inlet/outlet pipe 3 enters through the inlet (cutout) 4, splits into the groove 5, flows out, and then flows into the other inlet (cutout). part) 4 and flows out from the heat exchanger via the inflow and outflow pipes 3. 6 is an inlet/outlet (cutout part) for other fluids. The fluids flowing through the flat plates 1a and 1b are heat-exchanged both upward and downward by the grooves 5.

FIG. 4 is a cross-sectional view taken along the line A-A' shown in FIG. 1. 2 by flat plates 1a and 1b
Fluids c and d are completely separated, and the grooves 5 exchange heat between the fluids. In this case, the flat plate and the end plate are joined face-to-face by brazing, diffusion welding, etc. at high temperature while applying pressure from both sides of the end plate, and between the fluids c and d or between the two fluids c.
, d and the outside of the heat exchanger. However, in terms of the joint area between the end plate 2a and the flat plate 1a and the joint area between the end plate 2b and the flat plate 1b, the former has a larger groove portion 5 than the latter.
The pressure applied during joining is correspondingly smaller per unit area, and sufficient joint strength cannot be obtained in brazing or diffusion welding, resulting in leakage between fluids and external contact with the heat exchanger. Leakage between fluids may occur. On the other hand, if the applied pressure is increased in order to obtain sufficient bonding strength, there is a risk that the grooves where the compressive deformation of the grooves is large between the end plate 2b and the flat plate 1b where the bonding area is small or between the flat plates 1a and lb will be filled.

OBJECTS OF THE INVENTION An object of the present invention is to prevent leakage between fluids and between the outside of the heat exchanger and the fluid without deforming the heat exchange groove.

Structure of the Invention The present invention forms a VC layer on a flat plate with grooves and cutouts formed by etching or the like on one side, but only grooves are processed without cutouts on the flat plate where the end plate and the surface without grooves are joined. A heat exchanger is formed by stacking the following.

DESCRIPTION OF EMBODIMENTS FIG. 5 is a block diagram of a stacked heat exchanger according to an embodiment of the present invention. Note that elements common to those in the conventional example are given the same numbers.

Two types of flat plates 1a and 1b with different shapes having grooves serving as flow paths and cutouts serving as entrances and exits are stacked to form an end plate 2.
The flat plate 1a' to be joined to the flat plate 1a (FIG. 2) does not have the cutouts 4 and 6 of the flat plate 1a (FIG. 2), but is joined with only the groove 5. Therefore, the two-fluid C9d does not directly flow between the end plate and the non-grooved surface of the flat plate, which has a large joint area.
Leakage between fluids and leakage between two fluids and the outside of the heat exchanger can be prevented. FIG. 6 is a diagram showing the flat plate 1a'.

Here, 4' and 6' are recesses located at positions corresponding to the fluid inlets and outlets in the flat plates 1a and 1b, and are not cut out as described above but are stopped at the depth of the groove 5.

In the above example, a 2m flat plate is used to form two channels in which grooves in every other layer are communicated via cutouts, but if three types of flat plates are used, three independent channels are formed. A channel can also be formed. Furthermore, by devising the shape of the grooves, it is possible to intersect the grooves between adjacent flat plates to create countercurrent flow and increase heat exchange efficiency.

Effects of the Invention According to the present invention, by changing the shape of a portion of one of the stacked flat plates having grooves and cutouts that is in contact with an end plate having no fluid inlet/outlet, it is possible to eliminate deformation of the heat exchanger groove. , leakage between fluids and between the outside of the heat exchanger and the fluid can be prevented.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of a conventional stacked heat exchanger according to an embodiment, FIGS. 2 and 3 are perspective views of a flat plate in FIG. 1,
FIG. 4 is a sectional view taken along the line A-A' in FIG.
FIG. 5 is a sectional view of a heat exchanger according to an embodiment of the present invention, and FIG. 6 is a perspective view of a flat plate in FIG. 1a, 1b... flat plate, 2a, 2b... end plate, 3... inflow/outflow pipe, 4, 6... cutout, 4', 6'... ...Concave〇Name of agent Patent attorney Toshio Nakao and 1 other person 1st
Figure 2 Figure 5 Figure 3

Claims (2)

[Claims] (1) two or more types of first flat plates each having a groove whose end is connected to a first cutout and a second cutout separated from the groove;
A laminate comprising a second flat plate with a groove and no cutout, and an end plate, the first flat plate being alternately stacked to have a plurality of independent channels connecting the cutout and the groove, A laminated heat exchanger characterized in that the end plate is integrated with the laminated body by interposing a second flat plate with its groove forming side facing the laminated body. (2) There are two types of first flat plates, and the laminate has two independent flow paths connecting grooves of every other flat plate via cutouts. Laminated heat exchanger as described in Section 1.