JPH0719766A - Laminated sheet type heat exchanger - Google Patents

Abstract

PURPOSE:To improve heat exchange performance by making longer the length of a fluid passage per unit volume thereby achieving miniaturization. CONSTITUTION:In a laminated sheet type heat exchanger wherein a plurality of perforated heat transfer plates and a plurality of insulating plates in which fluid passages are drilled are stacked alternately to form two fluid passages so that heat is exchanged between two fluids through the heat transfer plates, a hole 22a and a hole 22b which are drilled in adjacent perforated heat transfer plates 21a, 21b respectively, an insulating plate being held therebetween, are arranged so as not to be coaxial with each other, so that the length of fluid passage of the fluids is made longer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated plate heat exchanger applied to cryogenic equipment such as helium liquefaction / refrigeration equipment.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional laminated plate heat exchanger. 1 is a laminated body in which a plurality of porous heat transfer plates (made of aluminum, etc.) and a plurality of heat insulating plates (fiber reinforced plastics (hereinafter referred to as FRP), etc.) are alternately bonded via adhesive sheets, 2, 3 Is a high temperature channel and a low temperature channel for allowing a low temperature fluid to pass therethrough, and 4 is a layer for distributing a high temperature fluid and a low temperature fluid to the high temperature channel 2 and the low temperature channel 3, respectively. The headers are connected to the upper and lower ends of the body 1, and a low temperature fluid and a high temperature fluid flow in and out as indicated by arrows in the figure. Reference numeral 5 denotes an outer shell made of stainless steel or the like for holding the laminated body 1 and the header 4.

FIG. 5 shows the structure of the laminate 1 shown in FIG. Reference numeral 11 denotes a heat insulating plate in which the fluid passages 2 and 3 are formed, and FRP or the like having a high heat insulating property is usually used. Reference numeral 12 denotes a heat transfer plate having a large number of minute holes formed therein, and is made of aluminum or the like having a good heat transfer property. The heat insulating plate 11 and the heat transfer plate 12 are alternately bonded via the adhesive sheet 13. The high temperature fluid and the low temperature fluid pass through the high temperature passage 2 and the low temperature passage 3, respectively, and heat is exchanged between the two fluids via the heat transfer plate 12. Further, the heat transfer in the stacking direction is blocked by the function of the heat insulating plates 11 alternately stacked with the heat transfer plates 12.

FIG. 6 shows a cross section of a laminate 1 composed of a heat insulating plate 11 and a heat transfer plate 12. The plurality of heat transfer plates 12
As shown in FIG. 6, the central axes of the microscopic holes 15 of the are aligned in a substantially straight line, and the fluid alternately passes through the heat transfer plate 12 and the heat insulating plate 11 as indicated by an arrow 14 in FIG. .

[0005]

In the above-mentioned conventional laminated plate heat exchanger, the central axes of the holes of the heat transfer plates constituting the laminated body are arranged in a substantially straight line, and the fluid is formed in a substantially linear shape. Since it flows, the length of the flow path can be obtained only as much as the thickness of the laminate
Improvement of heat transfer performance and miniaturization of heat exchanger are limited.

The present invention is intended to provide a laminated plate heat exchanger capable of solving the above problems.

[0007]

A laminated plate heat exchanger according to the present invention comprises a plurality of porous heat transfer plates, a fluid passage and a plurality of heat insulating plates which are bored alternately to form two systems in the stacking direction. In a laminated plate type heat exchanger that forms a fluid passage of 2 and exchanges heat between fluids of two systems via the heat transfer plate, two porous heat transfer plates adjacent to each other with a heat insulating plate sandwiched therebetween are drilled. The holes were arranged so that the centers of the holes were not coaxial with each other.

[0008]

In the laminated plate type heat exchanger according to the present invention, since the centers of the holes formed in the two heat transfer plates adjacent to each other with the heat insulating plate interposed therebetween are not coaxial, the fluid flows in each heat transfer plate. Flows while repeating branching and assembly. Therefore, the flow path length through which the fluid flows can be made longer than the thickness of the laminated body, and the heat transfer performance can be improved and the heat exchanger can be downsized.

[0009]

EXAMPLE FIG. 1 shows a first example of a heat transfer plate for a laminated plate heat exchanger according to the present invention. 21a and 21b are heat transfer plates. The heat transfer plates 21a and 21b are provided with a plurality of small holes 22a and 22b, respectively. These small holes are
As illustrated, the heat transfer plate 21a and the heat transfer plate 21b are arranged on concentric circles having different radii. The alternate long and short dash line in FIG. 1 indicates the position of the circle in which the small holes of the other heat transfer plate are arranged. As shown in FIG. 2, the heat transfer plates 21a and 21b are alternately laminated while sandwiching a heat insulating plate 11 similar to the conventional laminated plate heat exchanger shown in FIGS. Make up a container.

In this embodiment, as shown in FIG. 2, the fluid is a small hole 22a in the heat transfer plate 21a and a small hole 22 in the heat transfer plate 21b.
When passing through b, the flow is repeated while branching and gathering as shown by arrow 14. Therefore, it is possible to form a flow path that is longer than the thickness of the laminated body, and the heat transfer performance is improved as compared with the conventional laminated plate heat exchanger.

FIG. 3 shows a second embodiment of the laminated plate heat exchanger according to the present invention. In the first embodiment, the small holes are formed on the concentric circles having different radii of the adjacent heat transfer plates, but in the second embodiment, as shown in FIG.
In 1a and 21b, small holes 22a and 22b are arranged on straight lines parallel to each other at different positions. 23
Is a notch used for alignment when assembling the laminated body, and when the heat transfer plates 21a and 21b adjacent to each other are bonded by sandwiching the heat insulating plate, the notches 23 are aligned so that Small holes 22a, 22 for mating heat transfer plates
It can be arranged so that the centers of b are not coaxial with each other. The alternate long and short dash line in FIG. 3 indicates the position of the straight line where the small holes of the other heat transfer plate are arranged.

Also in this embodiment, the same operation and effect as those of the first embodiment can be obtained.

In addition to the first and second embodiments described above, it is easily conceivable that the centers of the small holes of the heat transfer plates adjacent to each other are not coaxial. All of these are included in the present invention.

[0014]

In the laminated plate heat exchanger according to the present invention, the heat permeable plates are sandwiched so that the centers of the holes formed in the two adjacent porous heat transfer plates are not aligned on the same axis. Therefore, the flow path length per unit volume can be made longer than that of the conventional laminated plate heat exchanger, and the heat transfer performance can be improved and the heat exchanger can be downsized.

[Brief description of drawings]

FIG. 1 is a front view of a heat transfer plate of a laminated plate heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the laminated body of the first embodiment.

FIG. 3 is a front view of a heat transfer plate of a laminated plate heat exchanger according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a conventional laminated plate heat exchanger.

FIG. 5 is a perspective view showing a configuration of a laminated body of the conventional laminated plate heat exchanger.

FIG. 6 is a cross-sectional view of a laminate of the conventional laminated plate heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated body 2 High temperature flow path 3 Low temperature flow path 4 Header 5 Outer shell 11 Heat insulating plate 12 Heat transfer plate 13 Adhesive sheet 14 Arrows showing fluid flow 15 Holes 21a, 21b Heat transfer plate 22a, 22b Small hole 23 Notch

Claims (1)

[Claims] 1. A plurality of porous heat transfer plates and a plurality of heat insulating plates having fluid passages are alternately laminated to form two systems of fluid passages in the stacking direction. In a laminated plate heat exchanger for exchanging heat between fluids of a system, the holes formed in two adjacent heat transfer plates sandwiching a heat insulating plate are arranged so that the centers of the holes are not aligned coaxially with each other. A laminated plate heat exchanger characterized by the above.