JP2010249399A - Plate type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate type heat exchanger having high corrosion resistance and heat transferring property, and further having high productivity. <P>SOLUTION: In this plate type heat exchanger 60 exchanging heat between a first fluid and a second fluid through a heat transfer plate, a bottom heat transfer plate 10 at a lowermost part of a heat exchanging section 50 is composed of a two-layered clad material having a copper layer at one face side of a base material composed of stainless steel, or stainless steel, an upper heat transfer plate 20 at an uppermost part of the heat exchanging section is composed of a two-layered clad material having a copper layer at a lower face side of a base material composed of stainless steel, and intermediate heat transfer plates 30, 40 are composed of a four-layered clad material constituted by successively disposing a first copper layer, a stainless steel layer, and a second copper layer in this order at a lower face side of a base material composed of stainless steel. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a plate heat exchanger in which at least three heat transfer plates are stacked so that a fluid flow path is formed between two adjacent heat transfer plates.

  One type of heat exchanger that exchanges heat between a first fluid and a second fluid having different temperatures is a plate heat exchanger. In this plate heat exchanger, at least three heat transfer plates are stacked and arranged so that a fluid flow path is formed between two adjacent heat transfer plates. Then, the first fluid is caused to flow through one of the two flow paths adjacent to each other via one heat transfer plate, and the second fluid having a temperature different from that of the first fluid is passed through the other flow path. Heat exchange is performed between the first fluid and the second fluid via the heat transfer plate, and the lower one of the first fluid and the second fluid is heated.

  Such a plate heat exchanger may be configured so that the first fluid and the second fluid do not mix immediately even when pitting corrosion or the like occurs in the heat transfer plate due to corrosion or the like. desired. For this reason, for example, in the plate heat exchanger described in Patent Document 1, the structure of each heat transfer plate is a two-layer structure in which a minute gap is provided between layers, and the fluid in the heat transfer plate is A fluid escape hole is provided in the periphery of the passage opening, and even when fluid leaks due to corrosion or material defects in one of the two layers forming the above two-layer laminated structure, the leakage occurred. Mixing the first fluid and the second fluid is prevented by allowing the fluid to flow through the gap and to be discharged to the outside from the escape hole around the passage opening.

JP 2002-107089 A

  However, in the plate heat exchanger described in Patent Document 1, each heat transfer plate has a two-layer laminated structure made of the same material, and a minute gap is provided between the layers. Is relatively low. Moreover, since it is a two-layer laminated structure of the same material with the same corrosion form, it is difficult to improve the corrosion resistance of the heat transfer plate itself. Furthermore, it is difficult to increase the productivity of a heat transfer plate having a two-layer structure in which minute gaps are provided between layers.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to obtain a plate-type heat exchanger having high corrosion resistance and high heat conductivity and good productivity.

  The present invention includes a heat exchanging portion in which at least three heat transfer plates are stacked so that a fluid flow path is formed between two adjacent heat transfer plates. A first fluid is allowed to flow through one of the two flow paths adjacent to each other, and a second fluid having a temperature different from that of the first fluid is allowed to flow through the other flow path between the first fluid and the second fluid. In a plate-type heat exchanger that performs heat exchange through a heat transfer plate, either a two-layer clad material in which a copper layer is provided on one side of a base material made of stainless steel or stainless steel, The bottom heat transfer plate is formed, and the upper heat transfer plate in the heat exchange part is formed by the two-layer clad material in which the copper layer is provided on the lower surface side of the base material made of stainless steel, and the lower surface of the base material made of stainless steel The first copper layer, the stainless steel layer, and A four-layer clad material in which the second copper layer is provided in this order forms an intermediate heat transfer plate disposed between the bottom heat transfer plate and the upper heat transfer plate in the heat exchange section. To do.

  In the plate heat exchanger of the present invention, at least each of the upper heat transfer plate and the intermediate heat transfer plate is formed by the clad material of stainless steel and copper having different corrosion forms, so that a minute gap is provided between the layers. The corrosion resistance and productivity of the heat transfer plate are increased as compared with the case of using a heat transfer plate having a two-layer structure of the same material. In addition, high heat conductivity can be obtained by the copper in the clad material, and since the copper functions as a brazing material, a plate heat exchanger can be produced without using a separate brazing material. Therefore, according to the present invention, a plate heat exchanger having high corrosion resistance and heat transfer properties and good productivity can be obtained.

FIG. 1 is a perspective view schematically showing an example of a plate heat exchanger according to the present invention. 2 is an exploded perspective view schematically showing the plate heat exchanger shown in FIG. FIG. 3 is a schematic diagram of a cross section taken along the line III-III in the plate heat exchanger shown in FIG. 4 is a cross-sectional view schematically showing an enlarged region surrounded by an ellipse IV in FIG. FIG. 5 is a cross-sectional view schematically showing an enlarged region surrounded by an ellipse V in FIG. FIG. 6 is a cross-sectional view schematically showing an enlarged view of the bottom heat transfer plate of the plate heat exchanger of the present invention, in which the bottom heat transfer plate is formed of a two-layer clad material of stainless steel and copper. FIG.

  Hereinafter, embodiments of the plate heat exchanger of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment.

Embodiment 1 FIG.
FIG. 1 is a perspective view schematically showing an example of a plate heat exchanger according to the present invention. The plate heat exchanger 60 shown in FIG. 1 includes a heat exchanging unit 50 that exchanges heat between a first fluid and a second fluid via a heat transfer plate, and a first heat exchanger 50 mounted on the heat exchanging unit 50. To fourth nipples 53a, 53b, 55a, 55b.

  Said heat exchange part 50 exhibits the shape which rounded the four corners of the rectangle on planar view. The heat exchanging unit 50 has a laminated structure in which six heat transfer plates are stacked so that a fluid flow path is formed between two adjacent heat transfer plates. Adjacent heat transfer plates are brazed together. Two types of intermediate heat transfer plates 30 and 40 are alternately stacked in this order from the bottom heat transfer plate 10 side between the lowermost bottom heat transfer plate 10 and the uppermost upper heat transfer plate 20, A total of five flow paths (not shown) extending in the longitudinal direction of the heat exchange unit 50 are formed in the heat exchange unit 50.

  On the other hand, the first nipple 53a and the second nipple 53b connect the first fluid supply pipe and the first fluid discharge pipe to the heat exchange section 50 in order to flow the first fluid into the heat exchange section 50. A first fluid supply pipe is connected to the first nipple 53a, and a first fluid discharge pipe is connected to the second nipple 53b. Similarly, the third nipple 55a and the fourth nipple 55b are provided with a second fluid supply pipe to the heat exchange unit 50 in order to cause the second fluid having a temperature different from that of the first fluid to flow through the heat exchange unit 50. The second fluid supply pipe is connected to the third nipple 55a, and the second fluid discharge pipe is connected to the fourth nipple 55b. The first to fourth nipples 53a, 53b, 55a, and 55b have the first nipple 53a and the second nipple 52b located on one diagonal line when the planar shape of the upper heat transfer plate 20 is regarded as a rectangle. The third nipple 55a and the fourth nipple 55b are mounted on the upper heat transfer plate 20 so as to be positioned on the other diagonal line.

  In the plate heat exchanger 60, when the first fluid is supplied from the first nipple 53 a to the heat exchanging unit 50 and the second fluid is supplied from the third nipple 55 a to the heat exchanging unit 50, the first heat flowing in the heat exchanging unit 50 is obtained. Heat exchange is performed between the first fluid and the second fluid through the heat transfer plate, and one of the first fluid and the second fluid (the fluid having a relatively low temperature) is heated. The The first fluid after heat exchange flows out of the plate heat exchanger 60 from the second nipple 53b, and the second fluid after heat exchange flows out of the plate heat exchanger 60 from the fourth nipple 55b. In FIG. 1, the inflow direction and the outflow direction of the first fluid in the plate heat exchanger 60 are indicated by solid arrows A, and the inflow direction and the outflow direction of the second fluid are indicated by dashed arrows B.

  In order to form the flow paths of the first fluid and the second fluid in the heat exchanging section 50, the bottom heat transfer plate 10, the upper heat transfer plate 20, and the intermediate heat transfer plates 30, 40 have through holes. And a seal portion is formed. In addition, a heat transfer portion is formed to increase the heat transfer efficiency. Hereinafter, the shape of each heat transfer plate will be described with reference to FIG.

  2 is an exploded perspective view schematically showing the plate heat exchanger shown in FIG. As shown in the figure, each of the heat transfer plates 10, 20, 30, and 40 is formed into a dish shape having rounded four corners when viewed in plan, and corresponds to the open end of the dish. They are stacked with the end facing down.

  The bottom heat transfer plate 10 has a rim 1 that is formed at the peripheral edge and protrudes to the side, and a region of the bottom heat transfer plate 10 that is located below the third nipple 55a and its periphery are trapezoidal. The second fluid inflow seal portion 6a is formed into a second shape, and the region located below the fourth nipple 55b and its periphery are formed in a table shape to form the second fluid outflow seal portion 6b. A corrugated plate-like heat transfer portion 9 that is recessed in a valley shape as a whole is formed on substantially the entire upper surface side of the bottom heat transfer plate 10.

  The upper heat transfer plate 20 has a rim portion 11 formed on the peripheral edge and projecting sideways, and first corners for mounting the first nipples 53a are provided at the four corners of the upper heat transfer plate 20. A through hole 13a, a second through hole 13b for mounting the second nipple 53b, a third through hole 15a for mounting the third nipple 55a, and a fourth through hole 15b for mounting the fourth nipple 55b are provided. Is formed. The periphery of the first through hole 13a is formed into a first trapezoidal portion 14a and is formed into a first trapezoidal portion 14a. Yes. A corrugated plate-like heat transfer portion 19 is formed on the entire upper surface of the upper heat transfer plate 20 so as to protrude in a mountain shape as a whole.

  Each intermediate portion heat transfer plate 30 has a rim portion 21 that is formed at the peripheral edge and protrudes laterally. A first fluid inflow hole 23a is formed in a region located below the first nipple 53a in the intermediate heat transfer plate 30, and a first fluid outflow passage is formed in a region located below the second nipple 53b. A hole 23b is formed. Further, a second fluid inflow through hole 25a is formed in a region located below the third nipple 55a, and a second fluid outflow through hole 25b is formed in a region located below the fourth nipple 55b. Yes. The periphery of the first fluid inflow through hole 23a is shaped like a trapezoid to form a first fluid inflow seal portion 24a, and the periphery of the first fluid outflow through hole 23b is shaped like a trapezoid to make a first fluid outflow. The seal portion 24b is formed. A corrugated plate-like heat transfer portion 29 that is recessed in a valley shape as a whole is formed on substantially the entire upper surface of each intermediate heat transfer plate 30.

  Each intermediate heat transfer plate 40 has a rim portion 31 that is formed at the peripheral edge and protrudes laterally. A first fluid inflow passage 33a is formed in a region of the intermediate part heat transfer plate 40 located below the first nipple 53a, and a first fluid outflow passage is formed in a region located below the second nipple 53b. A hole 33b is formed. Further, a second fluid inflow through hole 35a is formed in a region located below the third nipple 55a, and a second fluid outflow through hole 35b is formed in a region located below the fourth nipple 55b. Yes. The periphery of the second fluid inflow through hole 35a is shaped like a trapezoid to form a second fluid inflow seal portion 36a, and the periphery of the second fluid outflow through hole 35b is shaped like a trapezoid to make the second fluid outflow The seal portion 36b is formed. A corrugated plate-like heat transfer portion 39 that protrudes in a mountain shape as a whole is formed on substantially the entire upper surface of each intermediate heat transfer plate 40.

  When the heat exchange plate 50 is produced by stacking the heat transfer plates having the shape and structure described above, the heat exchange plate 50 is formed on each of the bottom heat transfer plate 10, the intermediate heat transfer plate 30, and the intermediate heat transfer plate 40. Each of the sealing portions is in close contact with the lower surface of the heat transfer plate thereabove, and a flow path for the first fluid and a flow path for the second fluid are defined in the heat exchange portion 50.

  Specifically, each of the second fluid inflow seal portion 6a and the second fluid outflow seal portion 6b of the bottom heat transfer plate 10 is in close contact with the lower surface of the intermediate heat transfer plate 30 thereon, and the bottom heat transfer plate A flow path of the first fluid is defined between 10 and the intermediate heat transfer plate 30 thereon. The second fluid inflow through hole 25a of the intermediate part heat transfer plate 30 is closed by the second fluid inflow seal part 6a in close contact with the lower surface of the intermediate part heat transfer plate 30, and the intermediate part heat transfer plate by the second fluid outflow seal part 6b. 30 is closed, the second fluid does not flow into the gap between the bottom heat transfer plate 10 and the intermediate heat transfer plate 30 thereabove. It becomes this flow path.

  Further, each of the first fluid inflow seal portion 24a and the first fluid outflow seal portion 24b of the intermediate portion heat transfer plate 30 is in close contact with the lower surface of the intermediate portion heat transfer plate 40 thereon, so that the intermediate portion heat transfer plate 30 is in contact. And a flow path of the second fluid is defined between the intermediate portion and the intermediate heat transfer plate 40 thereon. The first fluid inflow through hole 23a of the intermediate part heat transfer plate 30 becomes a continuous hole with the first fluid inflow through hole 33a of the intermediate part heat transfer plate 40 thereabove, and the first heat inflow plate 30 of the intermediate part heat transfer plate 30 is provided. Since the fluid outflow hole 23b is a continuous hole with the first fluid outflow hole 33b of the intermediate heat transfer plate 40 thereon, the intermediate heat transfer plate 30 and the intermediate heat transfer plate 40 thereon The first fluid does not flow into the gap between them, and the gap serves as a flow path for the second fluid.

  In the intermediate part heat transfer plate 40 in which the intermediate part heat transfer plate 30 is laminated on the intermediate part heat transfer plate 40, each of the second fluid inflow seal part 36a and the second fluid outflow seal part 36b is provided thereon. The first fluid flow path is defined between the intermediate heat transfer plate 40 and the intermediate heat transfer plate 30 thereabove. The second fluid inflow through hole 35a of the intermediate part heat transfer plate 40 becomes a continuous hole with the second fluid inflow through hole 25a of the intermediate part heat transfer plate 30 thereon, and the second heat inflow plate 40 of the intermediate part heat transfer plate 40 has a second hole. Since the fluid outflow hole 35b is a continuous hole with the second fluid outflow hole 25b of the intermediate heat transfer plate 30 thereon, the intermediate heat transfer plate 40 and the intermediate heat transfer plate 30 thereon The second fluid does not flow into the gap between the two, and the gap serves as a flow path for the first fluid.

  Moreover, in the intermediate part heat transfer plate 40 in which the upper heat transfer plate 20 is laminated on the intermediate part heat transfer plate 40, each of the first seal part 36 a and the second seal part 36 b is the upper heat transfer plate 20. The first fluid flow path is defined between the intermediate heat transfer plate 40 and the upper heat transfer plate 20 thereon. The second fluid inflow through hole 35a of the intermediate heat transfer plate 40 and the third through hole 15a of the upper heat transfer plate 20 form a continuous through hole, and the second fluid outflow through hole of the intermediate heat transfer plate 40 is formed. 35b and the fourth through hole 15b of the upper heat transfer plate 20 form a continuous hole, so that the second fluid does not flow into the gap between the intermediate heat transfer plate 40 and the upper heat transfer plate 20. The gap serves as a flow path for the first fluid.

As shown in FIG. 3, in the plate heat exchanger 60 in which the flow path of the first fluid and the flow path of the second fluid are defined in the heat exchange section 50 as described above, A total of five flow paths are formed. One of the two flow paths through the single heat exchanger plate (middle portion heat transfer plate 30 or the intermediate section heat transfer plate 40) adjacent to each other becomes the flow path P ₁ of the first fluid and the other flow path It becomes the flow path P ₂ of the second fluid. From the bottom heat transfer plate 10 side to the upper heat transfer plate 20 side, the first fluid flow path P ₁ and the second fluid flow path P ₂ are alternately formed in this order. FIG. 3 is a schematic diagram of a cross section taken along line III-III in the plate heat exchanger shown in FIG.

In the plate heat exchanger 60 in which the flow paths P ₁ and P ₂ are formed in the heat exchanging section 50, the first fluid is supplied from the first nipple 53a to the heat exchanging section 50, and the third nipple 55a (see FIG. When 1 or FIG. 2) to supply a second fluid to the heat exchange section 50, with the second fluid flowing through the first fluid flowing through the flow channel P ₁ of the first fluid flow path P ₂ of the second fluid Heat exchange is performed via the intermediate heat transfer plate 30 or the intermediate heat transfer plate 40. As a result, one of the first fluid and the second fluid (the fluid having a relatively low temperature) is heated. The first fluid after the heat exchange flows out of the plate heat exchanger 60 from the second nipple 53b, and the second fluid after the heat exchange flows from the fourth nipple 55b (see FIG. 1 or FIG. 2) to the plate heat exchanger. 60 flows out. Since the plate heat exchanger 60 is characterized by the material of each heat transfer plate, the material of each heat transfer plate will be described below with reference to FIG. 4 or FIG.

  4 is a cross-sectional view schematically showing an enlarged area surrounded by an ellipse IV in FIG. 3, and FIG. 5 is an enlarged schematic view showing an area surrounded by an ellipse V in FIG. It is sectional drawing shown. As shown in FIG. 4, the bottom heat transfer plate 10 has a single layer structure. Further, as shown in FIG. 5, the upper heat transfer plate 20 has a two-layer laminated structure. And as shown in FIG.4 and FIG.5, each intermediate | middle part heat-transfer plate 30 and 40 has 4 layer laminated structure.

  The bottom heat transfer plate 10 is made of stainless steel, for example, SUS316 having high corrosion resistance, and the upper heat transfer plate 20 is provided with a copper layer 20b (see FIG. 5) on the lower surface side of a base material 20a made of stainless steel. It is formed of a two-layer clad material. As with the bottom heat transfer plate 10, the base material 20 a in the upper heat transfer plate 20 is also preferably formed of stainless steel having high corrosion resistance, such as SUS316. The copper layer 20b is formed using, for example, oxygen-free copper or copper foil. In FIG. 5, for convenience, the copper layer 20b is smudged.

  The intermediate heat transfer plate 30 is a four-layer clad in which a first copper layer 30b, a stainless steel layer 30c, and a second copper layer 30d (see FIGS. 4 and 5) are provided in this order on the lower surface side of the base material 30a. It is made of material. The intermediate heat transfer plate 40 is also provided with a first copper layer 40b, a stainless steel layer 40c, and a second copper layer 40d (see FIGS. 4 and 5) in this order on the lower surface side of the base material 40a. It is formed of a layer clad material. 4 and 5, for convenience, the first copper layers 30b and 40b and the second copper layers 30d and 40d are each smudged.

  The intermediate heat transfer plate 30 and the intermediate heat transfer plate 40 can be formed of the same four-layer clad material. The base materials 30a and 40a in the intermediate heat transfer plates 30 and 40 are preferably formed of a highly corrosion-resistant stainless steel, for example, SUS316, and the stainless steel layers 30c and 40c are also formed of a highly corrosion-resistant stainless steel, for example, SUS316. It is preferable to do. In addition, each of the first copper layers 30b and 40b and each of the second copper layers 30d and 40d are formed using, for example, oxygen-free copper or copper foil.

  The base material 30a and the stainless steel layer 30c in the intermediate heat transfer plate 30 may have the same thickness, or one may be thicker than the other. Considering the mechanical strength of the intermediate heat transfer plate 30, it is preferable that each of the base material 30a and the stainless steel layer 30c is thicker than both the first copper layer 30b and the second copper layer 30d. However, from the viewpoint of enhancing the productivity of the four-layer clad material, it is preferable that the base material 30a and the stainless steel layer 30c are made of the same material stainless steel and have the same thickness. It is preferable that each of the first copper layer 30b and the second copper layer 30d is made of the same material and has the same thickness.

  Of course, one of the first copper layer 30b and the second copper layer 30d can be made thicker than the other. Considering the heat conductivity in the intermediate heat transfer plate 30, it is preferable that the first copper layer 30b is thicker than the second copper layer 30d. Moreover, since the 2nd copper layer 30d functions as a brazing material so that it may mention later, from a viewpoint of improving the function as a brazing material of the 2nd copper layer 30d, and a viewpoint of improving the corrosion resistance at the time of storage of a 4 layer clad material. It is preferable to make the second copper layer 30d thicker than the first copper layer 30b. By forming the first copper layer 30b and the second copper layer 30d with the same material, it is possible to stably perform brazing when producing the plate heat exchanger 60 (see FIG. 1 or FIG. 2). Becomes easier.

  In addition, the above-mentioned each matter which demonstrated the base material 30a in the intermediate part heat-transfer plate 30, the 1st copper layer 30b, the stainless steel layer 30c, and the 2nd copper layer 30d is the base material 40a in the intermediate-part heat transfer plate 40. The same applies to the first copper layer 40b, the stainless steel layer 40c, and the second copper layer 40d.

  The production of the heat transfer plate made of each of the above materials can be performed by, for example, press molding. The plate heat exchanger 60 is heated after the bottom heat transfer plate 10, the intermediate heat transfer plate 30, the intermediate heat transfer plate 40, and the upper heat transfer plate 20 (see FIG. 2) are stacked in a predetermined order. The second copper layer 30d in each intermediate heat transfer plate 30, the second copper layer 40d in each intermediate heat transfer plate 40, and the copper layer 20b in the upper heat transfer plate 20 (see FIG. 4 or FIG. 5) ) Function as a brazing material, and the heat transfer plates are integrated in a liquid-tight manner.

  In stacking the intermediate heat transfer plate 30 on the bottom heat transfer plate 10, the upper surface of the heat transfer section 9 in the bottom heat transfer plate 10 is brought into contact with the lower surface of the heat transfer section 29 of the intermediate heat transfer plate 30. Each of the second fluid inflow seal portion 6a and the second fluid outflow seal portion 6b in the bottom heat transfer plate 10 is brought into contact with the lower surface of the intermediate heat transfer plate 30, and further from the upper surface of the bottom heat transfer plate 10 The outer surface of the inclined portion extending to the rim portion 1 is brought into contact with the inner surface of the inclined portion extending from the upper surface of the intermediate heat transfer plate 30 to the rim portion 21 (see FIG. 2).

  In laminating the intermediate heat transfer plate 40 on the intermediate heat transfer plate 30, the upper surface of the heat transfer section 29 in the intermediate heat transfer plate 30 is placed on the lower surface of the heat transfer section 39 in the intermediate heat transfer plate 40. Each of the first fluid inflow seal portion 24a and the first fluid outflow seal portion 24b in the intermediate portion heat transfer plate 30 is brought into contact with the lower surface of the intermediate portion heat transfer plate 40, and further, the intermediate portion heat transfer plate The outer surface of the inclined portion from the upper surface at 30 to the rim portion 21 is brought into contact with the inner surface of the inclined portion from the upper surface at the intermediate heat transfer plate 40 to the rim portion 31 (see FIG. 2).

  In laminating the intermediate heat transfer plate 30 on the intermediate heat transfer plate 40, the upper surface of the heat transfer part 39 in the intermediate heat transfer plate 40 is placed on the lower surface of the heat transfer part 29 in the intermediate heat transfer plate 30. Each of the second fluid inflow seal portion 36a and the second fluid outflow seal portion 36b in the intermediate portion heat transfer plate 40 is brought into contact with the lower surface of the intermediate portion heat transfer plate 30, and further, the intermediate portion heat transfer plate The outer surface of the inclined portion from the upper surface at 40 to the rim portion 31 is brought into contact with the inner surface of the inclined portion from the upper surface at the intermediate heat transfer plate 30 to the rim portion 21 (see FIG. 2).

  When the upper heat transfer plate 20 is stacked on the intermediate heat transfer plate 40, the upper surface of the heat transfer unit 39 in the intermediate heat transfer plate 40 is changed to the lower surface of the heat transfer unit 19 in the upper heat transfer plate 20. The second fluid inflow seal portion 36a and the second fluid outflow seal portion 36b of the intermediate heat transfer plate 40 are brought into contact with the lower surface of the upper heat transfer plate 20, and further, the intermediate heat transfer plate 40 is contacted. The outer surface of the inclined portion from the upper surface to the rim portion 31 is brought into contact with the inner surface of the inclined portion from the upper surface of the upper heat transfer plate 20 to the rim portion 11 (see FIG. 2).

  Each of the first to fourth nipples 53a, 53b, 55a, 55b (see FIG. 2) is preliminarily attached to the upper heat transfer plate 20 before the upper heat transfer plate 20 is laminated on the intermediate heat transfer plate 40. The upper heat transfer plate 20 may be attached to the upper heat transfer plate 20 after being stacked on the intermediate heat transfer plate 40.

  Heating of the stacked heat transfer plates can be performed using an electric furnace such as a continuous electric furnace. At this time, you may apply a load to each heat-transfer plate from the lamination direction of a heat-transfer plate as needed. Regarding the heating temperature, each of the second copper layer 30d of each intermediate heat transfer plate 30, the second copper layer 40d of each intermediate heat transfer plate 40, and the copper layer 20b of the upper heat transfer plate 20 functions as a brazing material. Any temperature is acceptable. Adjacent heat transfer plates are brazed in a liquid-tight manner by the above heating, and a plate heat exchanger 60 is obtained.

  In the plate heat exchanger 60 that can be produced in this way, the upper heat transfer plate 20 and the intermediate heat transfer plate are made of a clad material in which high-potential stainless steel and low-potential copper are joined electrochemically. Since each of 30 and 40 is formed, the corrosion resistance of the upper heat transfer plate 20 and the intermediate heat transfer plates 30 and 40 is high. Even if corrosion occurs in one layer constituting the above clad material, the corrosion form of stainless steel is a single point concentrated type due to pitting corrosion, and the corrosion form of copper is full surface corrosion. It never happens. Therefore, compared to the case where each of the upper heat transfer plate 20 and the intermediate heat transfer plates 30 and 40 is made of a two-layer laminated structure of the same material, it is more resistant to corrosion and the corrosion life is extended. In addition, the productivity of the heat transfer plate is increased as compared with the case where each of the upper heat transfer plate 20 and the intermediate heat transfer plates 30 and 40 has a two-layer laminated structure of the same material with a minute gap between layers.

  Further, the first copper layers 30b and 40b and the second copper layers 30d and 40d in the intermediate heat transfer plates 30 and 40 can impart high heat transfer to the intermediate heat transfer plates 30 and 40, respectively. . In the upper heat transfer plate 20 and the intermediate heat transfer plates 30 and 40, when the heat transfer plates are stacked and heated, the lowermost copper layer, that is, the copper layer 20b in the upper heat transfer plate 20, Since the second copper layer 30d in the intermediate heat transfer plate 30 and the second copper layer 40d in each intermediate heat transfer plate 40 function as a brazing material, the copper layers 20b, 30d and 40d will be separated from the copper layers 20b, 30d and 40d. The heat exchange part 50 can be produced without using a material.

  Therefore, in the plate heat exchanger 60, it is easy to obtain a product with high corrosion resistance and high heat conductivity and good productivity. In addition, the manufacturing cost and weight can be easily reduced as compared with the case where the bottom heat transfer plate 10, the upper heat transfer plate 20, and the intermediate heat transfer plates 30, 40 are formed of a four-layer clad material. it can.

Embodiment 2. FIG.
In the plate heat exchanger of the present invention, the bottom heat transfer plate constituting the heat exchange part can be formed of a two-layer clad material of stainless steel and copper. In this case, the upper heat transfer plate 20 is preferably formed of the two-layer clad material described in the first embodiment, and each intermediate heat transfer plate is formed of the four-layer clad material described in the first embodiment. preferable.

  FIG. 6 is a cross-sectional view schematically showing an enlarged view of the bottom heat transfer plate in a plate heat exchanger in which the bottom heat transfer plate is formed of a two-layer clad material of stainless steel and copper. In the figure, in addition to the bottom heat transfer plate 110, intermediate heat transfer plates 30 and 40 thereon are also shown. 6 that are the same as those shown in FIG. 4 are assigned the same reference numerals as those used in FIG. 4 and descriptions thereof are omitted.

  As shown in FIG. 6, the bottom heat transfer plate 110 is formed of a two-layer clad material in which a copper layer 110b is provided on one side of a base material 110a made of stainless steel. As the two-layer clad material, for example, the same material as the two-layer clad material for forming the upper heat transfer plate 20 (see FIG. 5) in the plate heat exchanger 60 described in the first embodiment can be used. . The shape and configuration of the bottom heat transfer plate 110 are the same as the shape and configuration of the bottom heat transfer plate 10 described in the first embodiment, except that the materials are different.

  Such a plate heat exchanger having the bottom heat transfer plate 110 can be manufactured in the same manner as the plate heat exchanger 60 described in the first embodiment, and is similar to the plate heat exchanger 60. Has a technical effect. Further, since the bottom heat transfer plate 110 is formed of a two-layer clad material of stainless steel and copper, the corrosion resistance is improved and the corrosion life is extended as compared with the plate heat exchanger 60 described above.

  The plate heat exchanger according to the present invention has been described with reference to the embodiment. However, as described above, the present invention is not limited to the above-described embodiment. The plate heat exchanger of the present invention is characterized by selection of materials for the upper heat transfer plate and the intermediate heat transfer plate. Configurations other than the material, for example, the number and shape of the first fluid flow path and the second fluid flow path formed in the heat exchanging section can be selected as appropriate. These modifications, modifications, combinations, etc. are possible.

  The plate-type heat exchanger of the present invention is used as a plate-type heat exchanger for various uses for performing heat exchange between two liquids having different temperatures or heat exchange between two gases having different temperatures. be able to.

10 bottom heat transfer plate 20 upper heat transfer plate 20a base material 20b copper layer 30 intermediate heat transfer plate 30a base material 30b first copper layer 30c stainless steel layer 30d second copper layer 40 intermediate heat transfer plate 40a base material 40b first 1 copper layer 40c stainless steel layer 40d second copper layer 50 heat exchange part 53a first nipple 53b second nipple 55a third nipple 55b fourth nipple 60 plate heat exchanger 110 bottom heat transfer plate 110a base material 110b copper layer P ₁ First fluid channel P ₂ Second fluid channel

Claims (5)

A heat exchange section in which at least three heat transfer plates are stacked and arranged so that a fluid flow path is formed between two adjacent heat transfer plates is provided, and adjacent to each other via one heat transfer plate The first fluid flows through one of the two flow paths, and the second fluid having a temperature different from that of the first fluid flows through the other flow path, and is transmitted between the first fluid and the second fluid. In a plate heat exchanger that performs heat exchange via a heat plate,
Forming a bottom heat transfer plate in the heat exchanging portion by either a two-layer clad material provided with a copper layer on one side of a base material made of stainless steel and stainless steel,
An upper heat transfer plate in the heat exchange part is formed by a two-layer clad material in which a copper layer is provided on the lower surface side of a base material made of stainless steel,
With the four-layer clad material in which the first copper layer, the stainless steel layer, and the second copper layer are provided in this order on the lower surface side of the base material made of stainless steel, the bottom heat transfer plate and the Formed an intermediate heat transfer plate placed between the upper heat transfer plate,
A plate-type heat exchanger characterized by the above.   2. The plate-type heat according to claim 1, wherein each of the base material and the stainless steel layer in the intermediate heat transfer plate is thicker than both the first copper layer and the second copper layer. Exchanger.   3. The plate heat exchanger according to claim 1, wherein the first copper layer is thicker than the second copper layer. 4. Each of the base material and the stainless steel layer in the intermediate heat transfer plate has the same thickness,
Each of the first copper layer and the second copper layer has the same thickness.
The plate-type heat exchanger according to claim 1 or 2, wherein   Each of the said bottom part heat-transfer plate, the said upper part heat-transfer plate, and the said intermediate part heat-transfer plate has a corrugated plate-shaped heat-transfer part, It is any one of Claims 1-4 characterized by the above-mentioned. Plate heat exchanger.

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