JP2007232337A - Plate-type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate-type heat exchanger improving the corrosion resistance of a heat transfer plate 10, having excellent productivity compared with a double wall plate-type heat exchanger and reducible in manufacturing cost in the plate-type heat exchanger formed by laminating a predetermined number of heat transfer plates 10 formed with continuous uneven surfaces 14. <P>SOLUTION: A copper plate 11 which is a base material, and a clad material 12 with brazing filler metal 12a joined as a skin material to both front and rear faces of a copper plate 12a which is a core material, are laminated and press-formed in a two-sheet laminated state to form the heat transfer plate 10 which is blazed in a heating furnace for manufacture. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a plate heat exchanger that is formed by laminating a predetermined number of heat transfer plates having continuous uneven surfaces.

  A plate heat exchanger is a multilayered stack of heat transfer plates with continuous irregular surfaces such as corrugations and hemispherical shells, forming a fluid path with a narrow laminar spacing between the heat transfer plates. In addition, heat exchange is performed by alternately circulating two types of fluids such as liquid-liquid and liquid-gas in this laminar interval, and high thermal efficiency is realized by a dramatic increase in the heat transfer area. In such a plate heat exchanger, when a hole is formed due to corrosion in the heat transfer plate that partitions the flow passage, both fluids leak and mix, and this is the heat exchanger that is built into the hot water supply device. There is a danger of backflowing into city water.

As a means of avoiding fluid mixing due to the perforation of this heat transfer plate, two heat transfer plates of the same shape and the same material are stacked to form a set, and the two heat transfer plate units are stacked. There is a double wall type plate heat exchanger to be formed (for example, Japanese Patent Application Laid-Open No. 2002-107089, Patent Document 1). This is because when a hole is formed in the heat transfer plate, the leaked fluid is allowed to flow into the gap between the two heat transfer plates and the two kinds of fluids are discharged from the periphery of the heat transfer plate to the outside. Prevents immediate mixing.
JP 2002-107089 A

  However, in the double wall type plate heat exchanger, the heat transfer plate unit provided with a gap for drainage is inferior in thermal conductivity to one heat transfer plate and is stacked to ensure mechanical strength. Two sheets had to be joined, and the number of heat transfer plates increased, resulting in poor productivity.

  The present invention aims to solve these problems, and aims to improve the corrosion resistance of the heat transfer plate, and is excellent in productivity and reduced in production cost as compared with a double wall type plate heat exchanger. The object is to provide a possible plate heat exchanger.

  In order to achieve such an object, the present invention provides a plate heat exchanger in which a predetermined number of heat transfer plates 10 each having a continuous uneven surface 14 are laminated, and a copper plate 11 as a base material and a core material. The heat transfer plate 10 was formed by press molding in a two-ply state in which a clad material 12 having a brazing material 12b bonded as a skin material was laminated on both front and back surfaces of the copper plate 12a, and brazed in a heating furnace. It is characterized by this.

  In the plate heat exchanger described above, a metal plate formed by plating a metal layer functioning as a brazing material on both the front and back surfaces of the copper plate of the core material is used instead of the clad material 12.

  The plate heat exchanger according to the present invention is formed by press-molding a copper plate 11 and a clad material 12 in a stacked state to form a heat transfer plate 10, and a predetermined number of heat transfer plates 10 are stacked and assembled. When this assembly is put into an electric furnace, the brazing material 12b is formed on both the front and back surfaces of the clad material 12, so that the brazing material 12b melts and the upper and lower heat transfer plate 10 joints are brazed. The copper plate 11 and the clad material 12 are also brazed and joined together, and a plate heat exchanger is manufactured in a single brazing process. The heat transfer plate 10 after brazing has a four-layer structure of a copper plate 11 as a base material, an alloy layer in which the brazing material is melted, a copper plate 12a in the core material, and an alloy layer in which the brazing material is melted. Compared to the formula, it excels in corrosion resistance, and the alloy layer is superior in mechanical strength compared to a copper plate, and a heat exchanger excellent in pressure resistance can be manufactured.

  In addition, since the heat transfer plates 10 are press-formed in a state of being stacked two times, the number of man-hours is half of that required for individual forming, and it is not necessary to install a brazing material and is excellent in assembly workability. Therefore, it is excellent in productivity, and the production cost can be greatly reduced.

  In addition, instead of the clad material 12, a metal plate formed by plating a metal layer functioning as a brazing material on both the front and back surfaces of the copper plate of the core material can be used. It is possible to improve the corrosion resistance of the plate 10, improve the productivity of the heat exchanger, and significantly reduce the manufacturing cost.

The drawing shows an embodiment of the heat transfer plate 10 used in the plate heat exchanger of the present invention.
As shown in FIG. 1, the heat transfer plate 10 is formed by press-molding a rectangular plate of a predetermined size, forms a concave / convex surface 14 with continuous corrugations 14a on one side, bends the periphery, and provides a rim portion 15 to serve as a dish. The fluid through holes 16 are formed at the four corners.

  This heat transfer plate 10 uses a two-layered rectangular plate shown in FIG. 2, and is formed by press molding in a state of two-layer stacking a copper plate 11 and a clad material 12 as a base material. The clad material 12 is obtained by rolling and pressure-bonding (cladding) a thin foil-like brazing material 12b (phosphorus copper brazing) as a skin material on both front and back surfaces of a copper plate 12a as a core material. It is press-molded in a state where two sheets are stacked and formed into the shape shown in FIG.

  In the plate heat exchanger, the direction of the heat transfer plate 10 is sequentially reversed, and a predetermined number of layers are stacked by intersecting the corrugations 14a, and the rim portion 15, the peripheral edge of the through hole 16, the contact portion of the corrugation 14a, and the like. Manufactured by liquid-tight joining. When a predetermined number of heat transfer plates 10 are stacked and assembled, and this assembly is put into an electric furnace, the brazing material 12b is formed on both the front and back surfaces of the clad material 12, so that the brazing material 12b melts and the above-mentioned The joints are brazed, and the copper plate 11 and the clad material 12 are also brazed and joined together. In this way, a plate heat exchanger is manufactured in a single brazing process. In the plate heat exchanger manufactured in this way, two types of fluids such as liquid-liquid and liquid-gas are alternately circulated through the a-layer and b-layer separated by the upper and lower heat transfer plates 10 to exchange heat. Is done.

  The top view of the Example of the heat exchanger plate used with the plate type heat exchanger of this invention.   Sectional drawing of the rectangular plate used for a heat exchanger plate.   The cross-sectional end view cut | disconnected by AA in FIG.

Explanation of symbols

10 Heat Transfer Plate 11 Core Material 12 Skin Material 14 Uneven Surface

Claims (2)

In a plate type heat exchanger in which a predetermined number of heat transfer plates 10 having a continuous irregular surface 14 formed thereon are laminated,
The heat transfer plate 10 is formed by press-molding the copper plate 11 as a base material and the clad material 12 in which the brazing material 12b is bonded as a skin material on both the front and back surfaces of the copper plate 12a as the core material in a stacked state. A plate heat exchanger produced by brazing in a heating furnace.   2. The plate heat exchanger according to claim 1, wherein a metal plate formed by plating a metal layer functioning as a brazing material on both the front and back surfaces of the copper plate of the core material instead of the clad material 12 is used. .

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