JP2000337782A - Plate type heat exchanger and heat storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To laminate plates upon another in a state where the plates are firmly joined to each other and the withstanding pressure of the laminated plates are increased by providing projections having inclined surfaces on the plates, laminating the plates upon another in several ways so that the inclined surfaces of the plates may be joined to each other, and then, using the clearances produced in the projections as a flow passage. SOLUTION: Each plate A is formed to have the cross-sectional shapes shown in cross sections A-A and B-B. Since the cross section shown in cross section A-A has a projection 2 having inclined surfaces 3 and a uniform thickness, the shapes of the external surface 4 and internal surface 5 are similar to each other. In addition, the plate A has openings 6 at four corners. Therefore, a plate type heat exchanger having a high withstanding pressure and a light weight can be obtained without using any gasket, thick steel plate, nor bolt and nut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate heat exchanger, and more particularly, to a plate heat exchanger suitable for heat exchange of a high-pressure medium.

[0002]

2. Description of the Related Art Conventionally, it is known that plates are overlapped and fastened via a gasket so as to prevent leakage of internal fluid, and the overlapped plates are sandwiched between thick steel plates and fastened with bolts and nuts. Hideo, Heat Exchanger Design Handbook (Kogaku Tosho Co., Ltd., Showa 49)
), Chapter 14 of Alfa Laval Corporation (CT5101508) and JP-A-10-339590.
No. 6,009,036.

[0003] In addition, there is a case in which the superposed plates are joined by brazing and do not require a gasket, a thick steel plate and bolts and nuts, for example, in the catalog of Alfa Laval Co., Ltd. It is disclosed in the catalog of the plate heat exchanger.

[0004]

The above-mentioned prior art bolts and nuts which are tightened with bolts and nuts are heavy in weight, and there are restrictions on the fluids that can be used depending on the material of the gasket. In addition, what joins the plates by brazing,
It is difficult to say that a heat exchanger of the type in which the fluid is immersed in a fluid or the fluid flows down to the outer surface and exchanges heat with the fluid flowing inside has a small withstand pressure, which is more suitable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plate heat exchanger in which plates can be laminated without using a gasket, a thick steel plate, and bolts and nuts. A heat storage tank is provided.

[0006]

According to the present invention, there is provided a plate type heat exchanger in which a plurality of plates are stacked to form a flow path for a heat medium. The projections are overlapped so that they fit together and are joined on an inclined surface, and a gap formed in the projections is used as a flow path.

[0007] In the above, it is desirable that the joining of the inclined surfaces is at least one of an adhesive, solder and brazing. Further, in the above, it is desirable to use two plates. Furthermore, in the above-mentioned thing, it is desirable that two or more plates are further installed and water is sprayed on the surface.

Further, the present invention relates to a heat storage tank for generating ice on the surface of a heat exchanger, wherein the heat exchanger has a flow path formed by laminating a plurality of plates, and each plate has a uniform plate. And a projection having a thickness and a set of inclined surfaces.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A plate type heat exchanger is known as a compact heat exchanger having a large heat transfer rate, and a heat transfer plate having wavy ribs or hemispherical projections is overlapped and fastened via a gasket. A flow path is formed between the plates, and a high-temperature fluid and a low-temperature fluid alternately flow in every other flow path to exchange heat.

[0010] It is said that high and low temperature fluids performing the heat exchange flow in a counter-current state, and high flow rates can be obtained because the wavy ribs and projections disturb the flow. Hereinafter, a plate-type heat exchanger and a heat storage tank according to an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 shows a plate element of a plate heat exchanger according to an embodiment. A plate A is formed into a cross-sectional shape as shown in AA section and BB section. A
Since the projection 2 having the inclined surface 3 is formed in the -A cross section and the plate thickness is uniform, the shape of the outer surface 4 and the shape of the inner surface 5 are similar.

The BB section has two projections 2a, 2b.
However, like the AA cross section, the inclined surface 3 has no curvature in the inclination direction, and the shape of the inner surface 5 is the outer surface 4.
It is similar to the shape of. Further, the plate A1 has openings 6 at four corners. Such a shape can be easily formed by, for example, pressing a metal plate or injection molding a resin.

FIG. 2 shows the shape of a plate B7 which is a pair of the plate A1 shown in FIG.
The cross-sectional shape in the vicinity is symmetrical to the plate A1 as shown in the BB cross section in FIG. It is needless to say that the plate B7 can be formed by pressing a metal plate or by injection molding of a resin, similarly to the plate A1.

FIG. 3 shows a plate-type heat exchanger 8, in which plates A1 and B7 are alternately overlapped, the projections are fitted and the opposing inclined surfaces are joined. In the plate heat exchanger 8, flow paths formed by connecting the openings 6 are connected to the first fluid inlet 9a, the first fluid outlet 9b, the second fluid inlet 10a, and the second fluid outlet 10b, respectively. A plate A1 or a plate B7 plate having no opening 6 is used for the side plate 11 which faces the plate having the fluid port and the portion where the plate A1 and the plate B7 are stacked. The first fluid 12 flows in from the first fluid inlet 9a, and flows out from the diagonal first fluid outlet. On the other hand, the second fluid 13 is connected to the lower second fluid inlet 10a.
From the second fluid outlet 10b on the diagonal line, so that the first fluid 12 and the second fluid 13 flow in counterflow. Therefore, the heat exchange performance is improved.

FIG. 4 shows a cross section taken along the line AA of the side plate 11 of the plate heat exchanger 8 shown in FIG. The first fluid 12 flowing from the first fluid inlet 9a of the plate heat exchanger 8 flows out of the first fluid outlet 9b through the opening 6 from the first fluid channel 14. On the other hand, the second fluid 13 flowing from the second fluid inlet 10a flows through the opening 6 into the second fluid channel 1
5 through the second fluid outlet 10b.

FIG. 5 is a principle view for explaining the principle of the flow path formation of the plate heat exchanger according to one embodiment, and shows a fitting state of the projections. The shape of the inner surface 5 of the projection 2 having the inclined surface 3 is similar to the outer surface 4 because the thickness of the inner surface 5 is uniform. However, the inner surface 5 has a shape in which the outer surface 4 is reduced due to its thickness. Therefore, when the protrusions 2 having the same shape are fitted, the inner surface 5 and the outer surface 4 come into contact with each other, but they cannot be completely overlapped, and a gap 16 is generated. The gap 16 is used as a fluid flow path. Gap 1
6 can be obtained from the following equation as a function of the plate thickness t and the inclination angle θ of the inclined surface 3. h = t (1−COSθ) / COSθ (1) An arbitrary gap height h can be obtained by combining the plate thickness t and the inclination angle θ of the inclined surface 3. Further, in order to obtain a sufficient bonding strength, the respective plates are bonded at the surfaces where the inclined surfaces 3 are in contact with each other.

FIG. 6 shows another embodiment of the plates A and B shown in FIGS. 1 and 2 are different from those of FIGS. 1 and 2 in that a small projection 17 is provided in the projection 2 part of FIG. 1 and FIG.
In addition, the rectification and heat transfer performance of the fluid flowing through the second fluid flow path 15 can be promoted, and the large number of projections 17 are fitted and joined, so that the joining strength can be increased.

FIG. 7 shows still another embodiment in which two plates are joined to constitute a heat exchanger. The plate A18 and the plate B19 are provided with flow passage forming protrusions 20 and protrusions 17 having the same shape. Further plate A18
Are provided with openings 6a and 6b as fluid ports. A plate heat exchanger is constituted by superposing the plate A18 on the plate B19, fitting the projections and joining them.

FIG. 8 shows an AA cross section of the plate heat exchanger in which the plate A18 and the plate B19 are overlapped and joined. The fluid (not shown) flowing from the opening 6 a passes through the inflow channel 21 formed by the gap formed by fitting the projections of the same shape, and the flow channel 22 formed between the projections 17. While passing through, heat exchanges with an external fluid (not shown) and flows out of the opening 6b. And the projection 17
And a gap formed at the top of the flow path forming projection 20 is a closed space, and no fluid flows.

FIG. 9 shows a heat storage system in which a plate type heat exchanger 23 in which two plates are overlapped and joined is applied to a falling film heat exchanger. The cooling medium 24 conveyed from a cooling heat source device (not shown) flows into each plate type heat exchanger 23 from a cooling medium pipe 25a, and a flow path (not shown) formed by a gap between two stacked plates. ) And returns to the cooling heat source device from the cooling medium pipe 25b. The cold water 27 in the heat storage tank 26 is conveyed to a water sprinkling pipe 29 by a pump 28 and sprayed on the outer surface of the plate heat exchanger 23. The sprayed cold water 27 is cooled by the cooling medium 24 flowing inside the plate heat exchanger 23 to cool the cold water 27 in the heat storage tank 26.
When this system is used for an ice heat storage system, ice (not shown) is generated and grown on the outer surface of the plate heat exchanger 23 by flowing a cooling medium 24 of 0 ° C. or less, preferably −5 ° C. or less. Can be. When the ice has grown to a predetermined thickness, the superheated medium (not shown) is flowed instead of the cooling medium 24 to separate and drop the ice from the outer surface of the plate heat exchanger 23 and store the ice in the heat storage tank 26. .
If an overheating medium is used instead of the cooling medium 24,
Needless to say, it can be used as a hot water heat storage system.

FIG. 10 shows still another embodiment in which the plate heat exchanger 23 is applied to a static ice heat storage system. 9 in that the plate heat exchanger 23 is immersed in cold water 27 in a heat storage tank 26 and ice 30 is allowed to grow on the outer surface of the plate heat exchanger 23.
Thereby, the pump 28 and the water sprinkling pipe 29 become unnecessary, and the system can be simplified.

FIG. 11 shows still another embodiment of the plate heat exchanger shown in FIG. The plate A31 has a plurality of flow path forming protrusions 20 provided horizontally, and the openings 6a and 6a.
b are arranged diagonally. A left recess 33L and a right recess 33R are formed in a part of the flow path forming projection 20 of the plate B32.
Is different from that shown in FIG.

FIG. 12 shows a cross section of a flow path of a plate heat exchanger in which the plate A31 is overlapped on the plate B32 and the projections are fitted and joined. The fluid 34 flowing from the opening 6a of the plate A31 passes through the left recess 33L from the projection bottom channel 35 formed by the gap between the two plates, flows into the projection top channel 36, and again the right recess 33R.
From the opening 6b by repeating the path that flows into the projection bottom passage 35 from the opening 6b. In FIG. 7, the gap formed by the tops of the protrusions is a closed space, and the fluid cannot flow. However, with this configuration, all the gaps can be used as the flow path of the fluid 34. Therefore, the entire surface of the plate can be used for heat exchange, and the heat exchange performance can be further improved.

[0024]

As described above, according to the present invention, the plate is provided with the projection having the inclined surface, and the plate is overlapped so that the projection is fitted and joined on the inclined surface. Gaskets, thick steel plates and bolts
It is not necessary to use a nut, and it is possible to obtain a plate heat exchanger having a large pressure resistance and a reduced weight. Further, according to the present invention, the heat exchanger has a flow path formed by stacking a plurality of plates, and each plate has a projection having a uniform thickness and a set of inclined surfaces. Since the heat exchanger has a large pressure resistance and a light weight, a small and efficient heat storage tank can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view and a cross-sectional view of a plate according to an embodiment of the present invention.

FIG. 2 is a plan view and a cross-sectional view of a plate forming a pair with the plate of FIG. 1;

FIG. 3 is a perspective view showing a state in which plates of the plate heat exchanger according to the embodiment of the present invention are stacked.

FIG. 4 is a cross-sectional view of the plate heat exchanger according to one embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a fitting state of the protrusion according to the embodiment of the present invention.

FIG. 6 is a plan view of a plate according to another embodiment of the present invention.

FIG. 7 is a plan view of a plate according to still another embodiment of the present invention.

FIG. 8 is a sectional view of a heat exchanger constituted by the plate of FIG. 7;

FIG. 9 is a perspective view showing a heat storage system according to still another embodiment of the present invention.

FIG. 10 is a perspective view showing an ice heat storage device according to still another embodiment of the present invention.

FIG. 11 is a plan view of a plate according to still another embodiment of the present invention.

FIG. 12 is a partial plan view and a cross-sectional view illustrating a heat exchanger configured with the plate of FIG. 11.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Plate A, 2 ... Projection, 3 ... Inclined surface, 4 ... Outer surface, 5
... inner surface, 6 ... opening, 7 ... plate B, 16 ... gap, 2
0: channel forming projection, 33: recess, 35: projection bottom channel,
36 ... Projection top flow path.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Sadao Sekiya 502 Kandachi-cho, Tsuchiura-shi, Ibaraki Pref. Machinery Research Laboratories, Hitachi, Ltd. Shimizu Production Headquarters (72) Inventor Kunio Fujie 3-18-17 Asaya Minami, Suginami-ku, Tokyo 3F103 F-term (reference) 3L103 AA05 AA11 BB42 CC02 CC28 DD57

Claims (5)

[Claims] 1. A plate heat exchanger in which a plurality of plates are stacked to form a flow path of a heat medium, wherein the plate has a projection having an inclined surface, and the projection is fitted and joined at the inclined surface. A plate-type heat exchanger, wherein a gap formed in the protrusion is used as the flow path. 2. The plate type heat exchanger according to claim 1, wherein the joining of the inclined surface is at least one of an adhesive, solder, and brazing. 3. The plate heat exchanger according to claim 1, wherein the number of the plates is two. 4. The plate type heat exchanger according to claim 1, wherein a plurality of plates having two plates are further provided, and water is sprayed on a surface of the plate. 5. A heat storage tank for generating ice on the surface of a heat exchanger, wherein the heat exchanger has a flow path formed by stacking a plurality of plates, and each plate has a uniform thickness. And a projection having a set of inclined surfaces.