JP2022080614A - Plate-type heat exchanger - Google Patents

Abstract

To provide a plate-type heat exchanger which hardly causes the deterioration of a gasket which is gripped between heat transfer plates, and forms a flow passage.SOLUTION: A plate-type heat exchanger comprises a plate lamination part having a plurality of heat transfer plates and a plurality of gaskets gripped between the heat transfer plates. The plate lamination part has a flow passage forming part in which a flow passage is formed between the heat transfer plates, a gasket grip part which grips the gasket between the heat transfer plates, and surrounds the flow passage forming part, and at least one wall part which is formed by the abutment of opposing regions of two heat transfer plates which grip the gasket at the gasket grip part. The at least one wall part surrounds the flow passage forming part at least at one side of the flow passage forming part side, and a side opposite to the flow passage forming part side with respect to the gasket grip part.SELECTED DRAWING: Figure 7

Description

The present invention relates to a plate heat exchanger in which a gasket is sandwiched between heat transfer plates.

Conventionally, as shown in FIG. 13, a flow path R through which a fluid can flow is provided between a plurality of heat transfer plates 501 stacked in a predetermined direction and a heat transfer plate 501 sandwiched between the heat transfer plates 501. A plate heat exchanger 500 including a plurality of gaskets 502 to be formed is known (see Patent Document 1).

Each of the plurality of heat transfer plates 501 is a metal plate and has thermal conductivity. Further, each of the gaskets 502 sandwiched between the heat transfer plates 501 is made of resin and has elasticity.

In the plate heat exchanger 500, the high temperature fluid and the low temperature fluid alternately flow through the heat transfer plates 501, so that heat exchange between the fluids is performed through the heat transfer plate 501.

Japanese Unexamined Patent Publication No. 4-273994

In the plate heat exchanger 500 described above, the gasket 502 for forming the flow path R is in contact with the fluid or air (outside air) flowing in the flow path R. Therefore, the gasket 502 is likely to be deteriorated due to oxidation or the like. As this deterioration progresses, the fluid flowing through the flow path R leaks from between the heat transfer plate 501 and the gasket 502, that is, liquid leakage occurs in the plate heat exchanger 500.

Therefore, it is an object of the present invention to provide a plate type heat exchanger in which a gasket sandwiched between heat transfer plates and forming a flow path is not easily deteriorated.

The plate heat exchanger of the present invention
A fluid can flow between the plurality of heat transfer plates stacked in a predetermined direction and the two heat transfer plates adjacent to each other in the predetermined direction among the plurality of heat transfer plates. A plate laminate with a plurality of gaskets forming a flow path,
The plate laminated portion is
A flow path forming portion in which the flow path is formed between the heat transfer plates, and a flow path forming portion.
The gasket is sandwiched between the heat transfer plates, and the gasket sandwiched between the heat transfer plates is a gasket holding portion in which the gaskets are arranged in a predetermined direction, and the gasket holding portion surrounds the flow path forming portion. When,
It has at least one wall portion formed by abutting the facing portions of the two heat transfer plates sandwiching the gasket in the predetermined direction in the gasket sandwiching portion.
The at least one wall portion surrounds the flow path forming portion on at least one side of the gasket sandwiching portion on the inner side on the flow path forming portion side and on the outer side opposite to the flow path forming portion side.

In this way, the wall portion surrounds the flow path forming portion on at least one of the inside and the outside of the gasket holding portion, so that the gasket holding portion is sandwiched between the two heat transfer plates constituting the wall portion to the gasket side. The movement of air or fluid from the flow path from the outside is suppressed, thereby suppressing deterioration of the gasket due to contact with air or fluid.

In the plate heat exchanger,
In the plate stacking portion, the plurality of heat transfer plates are stacked so as to be separable from each other.
The at least one wall portion is formed by abutting the tops of ridges that are convex in the direction of approaching each other in two heat transfer plates sandwiching the gasket.
In the cross section of at least one of the ridges where the tops abut.
The ridges each have a pair of sloping portions that extend from the apex and increase in distance from each other as they move away from the apex.
At least one of the pair of inclined portions has a wave shape that is convex at least one on one surface side and the other surface side of the heat transfer plate constituting the inclined portion. May be good.

In this way, by making the cross-sectional shape of at least one of the inclined portions of the pair of inclined portions into a wavy shape and giving the inclined portions a spring property, a plurality of heat transfer plates are laminated in a predetermined direction to stack the plates. When the portion is formed, the force in a predetermined direction applied to the ridges (the ridges having a wavy ridge in the cross section) constituting the wall part is absorbed by the elastic deformation of the ridges, whereby the ridges absorb the force. Deformation such as a dent caused by the force in the predetermined direction can be suppressed. Moreover, by giving springiness to at least one inclined portion, when the plate laminated portion is disassembled and the heat transfer plates are separated from each other, the protrusions are less likely to be deformed, that is, after the elastic deformation. Since the shape is restored by the separation of each heat transfer plate, the heat transfer plates can be overlapped again to form a plate laminated portion (reuse).

Further, in the plate heat exchanger,
The plate laminated portion has an auxiliary gasket arranged on at least one side of the wall portion in the predetermined direction.
The auxiliary gasket may press the wall portion and the heat transfer plate adjacent to the wall portion in a predetermined direction in a direction away from each other.

According to such a configuration, since the portion of one heat transfer plate constituting the wall portion is pushed by the auxiliary gasket toward the portion of the other heat transfer plate constituting the wall portion, the two portions constituting the wall portion. The movement of air or fluid through the parts of the heat transfer plate to the gasket holding portion side (gasket side) is more reliably suppressed.

Further, in the plate heat exchanger,
The plate laminated portion has a plurality of wall portions arranged at positions corresponding to the gaskets sandwiched between the heat transfer plates in the gasket holding portion on the outer side of the gasket holding portion.
Each heat transfer plate has a first hole portion and a second hole portion penetrating in the predetermined direction between the portion constituting the gasket sandwiching portion and the portion constituting the wall portion.
In the plate laminated portion,
In the plurality of heat transfer plates, a first flow path through which the first fluid flows and a second flow path through which the second fluid flows are alternately formed in the predetermined direction via the heat transfer plates.
The first hole portion of each heat transfer plate is connected in the predetermined direction to form the first flow path, the gasket of the gasket holding portion in the two heat transfer plates, and the outer side of the gasket. A first leak detection flow path that communicates with each first leak space defined between the wall and the wall is configured.
The second hole portion of each heat transfer plate is connected to the predetermined direction so that the gasket of the gasket holding portion in the two heat transfer plates forming the second flow path and the outer side of the gasket. A second leak detection flow path that communicates with each second leak space defined between the wall portion may be configured.

According to this configuration, since the plate laminated portion has a first leak detection flow path communicating with each first leak space and a second leak detection flow path communicating with each second leak space, the first leak is detected. Detects which of the first fluid and the second fluid has leaked in the gasket sandwiching portion by discharging the fluid from either the detection flow path or the second leakage detection flow path. can do.

Further, even if both the first fluid and the second fluid leak at the gasket sandwiching portion, they are separated from each other without contacting the first fluid and the second fluid (the first leak detection flow path and the second fluid). (2) It can be discharged to the outside through the leak detection flow path).

From the above, according to the present invention, it is possible to provide a plate type heat exchanger in which the gasket sandwiched between the heat transfer plates and forming the flow path is not easily deteriorated.

FIG. 1 is a perspective view of a plate heat exchanger according to the present embodiment. FIG. 2 is an exploded perspective view of the plate heat exchanger. FIG. 3A is a front view of a plate laminated portion included in the plate heat exchanger. FIG. 3B is a diagram showing a range of a flow path forming portion, a gasket sandwiching portion, and an outer sealing portion in the plate laminated portion. FIG. 4 is an exploded perspective view of the plate laminated portion. FIG. 5 is a view of the first heat transfer plate constituting the plate laminated portion as viewed from the first surface side. FIG. 6 is a view of the first heat transfer plate viewed from the second surface side. FIG. 7 is a partially enlarged view of a cross section at the VII-VII position of FIG. 3A. FIG. 8 is a partially enlarged view of a cross section at the VII-VII position of FIG. 3A. FIG. 9 is a diagram showing the range of the first leakage space. FIG. 10 is a diagram showing the range of the second leakage space. FIG. 11 is a partially enlarged view of a cross section at the XI-XI position of FIG. 3A. FIG. 12 is a partially enlarged view of a cross section of the plate laminated portion of another embodiment. FIG. 13 is a partially enlarged view of a cross section of a conventional plate heat exchanger.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 11.

As shown in FIGS. 1 to 4, the plate-type heat exchanger according to the present embodiment (hereinafter, simply referred to as “heat exchanger”) includes a plate laminated portion 2 having a plurality of heat transfer plates 3. Further, the heat exchanger 1 includes a pair of frames 5a and 5b that sandwich the plate laminated portion 2, a guide portion 6 that guides the plate laminated portion 2 and the pair of frames 5a and 5b to the arrangement position, and a pair of frames 5a. A plurality of tightening members 7 capable of tightening 5b in a direction in which the distance between them becomes smaller are provided.

The plate stacking portion 2 is between a plurality of heat transfer plates 3 stacked in a predetermined direction and two heat transfer plates 3 adjacent to each other in a predetermined direction among the plurality of heat transfer plates 3 (hereinafter, simply "between plates"). It also has a plurality of gaskets 4 sandwiched between the gaskets 4 and the like.

The plate laminated portion 2 has a plurality of flow paths Ra and Rb in which heat exchange between the fluids A and B is performed by flowing the fluids A and B, and from the outside of the plate laminated portion 2 to the respective flow paths Ra and Rb. It is provided with a plurality of communication passages Rc and Rd that allow the fluids A and B to flow in or flow out from the flow paths Ra and Rb to the outside of the plate laminated portion 2. Further, the plate laminated portion 2 of the present embodiment includes a plurality of leak detecting flow paths Re and Rf that discharge the fluids A and B leaking from the respective flow paths Ra and Rb to the outside of the plate laminated portion 2.

Specifically, the plate laminating portion 2 has flow paths Ra and Rb between the plates of the plurality of superposed heat transfer plates 3. In the plate laminated portion 2 of the present embodiment, two types of rectangular (rectangular) heat transfer plates (first heat transfer plate 3A and second heat transfer plate 3B) are alternately superposed to each other. The first flow path Ra through which the first fluid A can flow and the second flow path Rb through which the second fluid B can flow are alternately formed with the plates 3A and 3B as boundaries. Then, in the plate laminated portion 2, the first fluid A flowing through the first flow path Ra and the second fluid B flowing through the second flow path Rb separate the first flow path Ra and the second flow path Rb from the heat transfer plate. Heat is exchanged through 3A and 3B. In the following, the direction in which the heat transfer plates 3 are overlapped (predetermined direction) is defined as the X-axis direction of the Cartesian coordinate system, the short side direction of the heat transfer plate 3 is defined as the Y-axis direction of the Cartesian coordinate system, and the length of the heat transfer plate 3 is set. Each configuration of the heat exchanger 1 will be described with the side direction as the Z-axis direction of the Cartesian coordinate system.

Further, the plate laminated portion 2 has a pair of first communication passages Rc1 and Rc2 each extending in the X-axis direction and communicating only with the first flow path Ra, and each extending in the X-axis direction and only with the second flow path Rb. It has a pair of second communication passages Rd1 and Rd2 that communicate with each other. One of the pair of first series passages Rc1 and Rc2, the first series passage Rc1, allows the first fluid A to flow (guide) into each first passage Ra from the outside of the plate laminated portion 2, and the other second. The series passage Rc2 causes the first fluid A to flow out (guide) from each first flow path Ra to the outside of the plate laminated portion 2. Further, one of the pair of second passages Rd1 and Rd2, the second passage Rd1, causes the second fluid B to flow (guide) into each second passage Rb of the plate laminated portion 2, and the other second passage Rd. The double passage Rd2 causes the second fluid B to flow out (guide) from each second flow path Rb to the outside of the plate laminated portion 2.

Further, the plate stacking portion 2 has at least one first leak detection flow path Re extending in the X-axis direction and at least one second leak detection flow path Rf extending in the X-axis direction. The plate laminated portion 2 of the present embodiment has two first leak detection flow paths Re and two second leak detection flow paths Rf. Each of these two first leak detection flow paths Re communicates only with the first leak space Rg1 (range indicated by smoke in FIG. 9) formed between predetermined plates, and the first fluid A communicates with the first flow path Ra. When leaking into the first leak space Rg1, the leaked first fluid A is discharged (guided) to the outside of the plate laminated portion 2. Further, each of the two second leak detection flow paths Rf communicates only with the second leak space Rg2 (range indicated by smoke in FIG. 10) formed between the predetermined plates, and the second fluid B is the second flow. When the leaked second fluid B leaks from the path Rb to the second leak space Rg2, the leaked second fluid B is discharged (guided) to the outside of the plate laminated portion 2. The details of the first leak space Rg1 and the second leak space Rg2 will be described later.

Each of the plurality of heat transfer plates 3 spreads in a direction orthogonal to the X-axis direction. As shown in FIGS. 5 and 6, each of the plurality of heat transfer plates 3 has a first surface S1 which is one surface in the X-axis direction and a surface opposite to the first surface S1 (the other surface). ), Each of the second surface S2 has a plurality of convex portions 3C and a plurality of concave portions 3R. In addition, in FIGS. 2, 3A, 4 to 6, 9 and 10, the configurations (shape, position, number, etc.) of the convex portion 3C and the concave portion 3R are shown in a simplified manner.

Each of these plurality of heat transfer plates 3 is formed by press-molding a metal plate (thin plate). Therefore, on the second surface S2, the recess 3R is located at the position corresponding to the convex portion 3C of the first surface S1 (that is, the back surface of the convex portion 3C), and the position corresponding to the concave portion 3R of the first surface S1 (that is, the position corresponding to the concave portion 3R of the first surface S1). That is, the convex portion 3C is located on the back surface of the concave portion 3R). That is, in each heat transfer plate 3, the convex portion 3C of the first surface S1 and the concave portion 3R of the second surface S2 corresponding to the convex portion 3C have a front-back relationship, and the concave portion 3R of the first surface S1. And the convex portion 3C of the second surface S2 corresponding to the concave portion 3R are in a front-to-back relationship.

The plurality of heat transfer plates 3 of the present embodiment include two types of heat transfer plates (first heat transfer plate 3A, second heat transfer plate 3B), and some of these two types of heat transfer plates 3A and 3B are used. One heat transfer plate (second heat transfer plate) 3B has the same configuration as the other heat transfer plate (first heat transfer plate) 3A in an inverted state, except for the configuration of (the gasket arrangement portion 34 described later). Is. Specifically, the arrangement patterns (shape in the X-axis direction, cross-sectional shape, uneven direction, etc.) of the convex portion 3C and the concave portion 3R of the first heat transfer plate 3A are as shown in FIGS. 5 and 6, and the second The arrangement pattern of the convex portion 3C and the concave portion 3R of the heat transfer plate 3B is the same as that of the convex portion 3C and the concave portion 3R of the first heat transfer plate 3A in the inverted state except for the gasket arrangement portion 34 (see FIG. 10). ).

Specifically, each heat transfer plate 3A and 3B has a main heat transfer portion 31 arranged in the central portion in the Z-axis direction, a communication portion 32 arranged at the end portion in the Z-axis direction, and a main heat transfer portion 31. It has a dam portion 33 arranged between the communication portion 32 and the communication portion 32. Each of the heat transfer plates 3A and 3B of the present embodiment has communication portions 32 at both ends in the Z-axis direction, and is between the main heat transfer portion 31 and one of the communication portions 32, and with the main heat transfer portion 31. Each of the other communication portions 32 has a weir portion 33. That is, each heat transfer plate 3A and 3B has a pair of communication portions 32 and a pair of weir portions 33.

Further, as shown in FIGS. 7 and 8, each heat transfer plate 3A and 3B has a gasket arrangement portion 34 on which the gasket 4 is arranged and a heat transfer plate adjacent to each other on the outside of the gasket arrangement portion 34 in the X-axis direction. It has a wall component 30 that constitutes the wall 305 by abutting on 3B and 3A. Further, each of the heat transfer plates 3A and 3B of the present embodiment also has a pair of guide notches 35 at both ends in the Z-axis direction.

The main heat transfer unit 31 is located between the fluids (first fluid A and second) flowing between the first flow path Ra and the second flow path Rb formed on the heat transfer plates 3A and 3B with the heat transfer plates 3A and 3B as boundaries. This is the site where most of the heat exchange (with fluid B) takes place. The main heat transfer unit 31 of the present embodiment is a square portion when viewed from the X-axis direction.

The main heat transfer portion 31 has a plurality of convex portions 31C and a plurality of concave portions 31R on both sides thereof. The arrangement and form of the plurality of convex portions 31C and the plurality of concave portions 31R are set according to the heat transfer efficiency, the type of the fluid (first fluid A and the second fluid B) for heat exchange, and the like. The plurality of convex portions 31C and the plurality of concave portions 31R arranged on each surface of the main heat transfer portion 31 of the present embodiment have a wavy shape, but are not limited to this shape (arrangement). The plurality of convex portions 31C are included in the plurality of convex portions 3C of the heat transfer plates 3A and 3B, and the plurality of concave portions 31R are included in the plurality of concave portions 3R of the heat transfer plates 3A and 3B.

Each of the pair of communication portions 32 has a plurality of first through holes 321 penetrating in the X-axis direction and at least one second through hole 322. Each communication portion 32 of the present embodiment has two first through holes 321a and 321b and two second through holes (first hole portion and second hole portion) 322a and 322b. Each of these pair of communication portions 32 also has a plurality of convex portions 32C and a plurality of concave portions 32R on both sides. The plurality of convex portions 32C and the plurality of concave portions 32R have the strength of the heat transfer plates 3A and 3B to be secured, the size of the distribution space of the fluids A and B to be secured, the types of the fluids A and B for heat exchange, and the like. The arrangement and form are set according to the above. The plurality of convex portions 32C are included in the plurality of convex portions 3C of the heat transfer plates 3A and 3B, and the plurality of concave portions 32R are included in the plurality of concave portions 3R of the heat transfer plates 3A and 3B.

Specifically, in each communication portion 32, the two first through holes 321a and 321b are arranged at intervals in the Y-axis direction. As a result, first through holes 321 are arranged at the four corners of the heat transfer plates 3A and 3B, respectively.

Each of these first through holes 321 forms a communication passage Rc, Rd by being connected in the X-axis direction in a state where a plurality of heat transfer plates 3A and 3B are overlapped (that is, in the plate laminated portion 2). In each of the heat transfer plates 3A and 3B of the present embodiment, each of the four first through holes 321 is a circular hole, and the size (diameter) of each of the first through holes 321 is the same.

Further, in each communication portion 32, the two second through holes 322a and 322b have the corresponding first through holes 321a and 321b on the end side of the heat transfer plates 3A and 3B, specifically, the heat transfer plate 3A. It is arranged closer to the corner (corner) of 3B.

Each of these second through holes 322 forms a leak detection flow path Re and Rf by being connected in the X-axis direction in a state where a plurality of heat transfer plates 3A and 3B are overlapped (that is, in the plate laminated portion 2). The second through hole 322 is smaller than the first through hole 321. In each of the heat transfer plates 3A and 3B of the present embodiment, each of the four second through holes 322 is a circular hole, and the size (diameter) of each of the second through holes 322 is the same.

Further, the hole peripheral portion (second through hole peripheral portion) 3220 of the second through hole 322a on one side (right side in FIG. 5 / left side in FIG. 6) of each communication portion 32 of the first heat transfer plate 3A is the first. It is a convex portion when viewed from the surface S1 side, and is a concave portion when viewed from the second surface S2 side. On the other hand, the hole peripheral portion (second through hole peripheral portion) 3220 of the second through hole 322b on the other side (left side in FIG. 5 / right side in FIG. 6) of each communication portion 32 is viewed from the first surface S1 side. It is a concave portion and a convex portion when viewed from the second surface S2 side.

On the other hand, the hole peripheral portion (second through hole peripheral edge portion) 3220 of the second through hole 322a on one side in each communication portion 32 of the second heat transfer plate 3B is a concave portion when viewed from the first surface S1 side, and is a second. It is a convex portion when viewed from the two-sided S2 side. On the other hand, the hole peripheral portion (second through hole peripheral edge portion) 3220 of the second through hole 322b on the other side in each communication portion 32 is a convex portion when viewed from the first surface S1 side, and is the second surface S2 side. It is a recess when viewed from.

Each configuration of the communication portion 32u on one side (upper side of FIG. 5) of the pair of communication portions 32 and each configuration of the communication portion 32d on the other side (lower side of FIG. 5) of the pair of communication portions 32. Is line symmetry with the horizontal center line CL2 as the axis of symmetry when viewed from the X-axis direction. The horizontal center line CL2 is a virtual line extending in the Y-axis direction from the center of the heat transfer plates 3A and 3B in the Z-axis direction.

Further, each of the communication portions 32u and 32d has a substantially line-symmetrical arrangement and shape with the vertical center line CL1 as the axis of symmetry when viewed from the X-axis direction. Here, the vertical center line CL1 is a virtual line extending in the Z-axis direction from the center of the heat transfer plates 3A and 3B in the Y-axis direction. Then, each configuration in the first region T1 on one side (right side in FIG. 5 / left side in FIG. 6) of the vertical center line CL1 in the communication portions 32u and 32d, and the vertical center line CL1 in the communication portions 32u and 32d. The displacement direction in the X-axis direction is opposite to that of each configuration in the second region T2 on the other side (left side in FIG. 5 / right side in FIG. 6).

For example, specifically, the configuration of the first region T1 corresponding to the configuration (for example, the convex portion 32C) protruding (displaced) on one side in the X-axis direction in the second region T2 is recessed on the other side in the X-axis direction. The configuration of the first region T1 corresponding to the configuration (for example, the concave portion 32R) which is recessed (displaced) on the other side in the X-axis direction in the second region T2 (for example, the concave portion 32R) is the configuration in the X-axis direction. It is a configuration (for example, a convex portion 32C) that protrudes (displaces) to one side.

As shown in FIGS. 5 and 6, each of the pair of weir portions 33 has a flow of fluids A and B from the first through hole 321 toward the main heat transfer portion 31 along the first surface S1 or the second surface S2. Is diffused in the Y-axis direction, or the flows of the fluids A and B from the main heat transfer portion 31 toward the first through hole 321 along the first surface S1 or the second surface S2 are focused in the Y-axis direction. be.

Specifically, each weir portion 33 is a triangular portion having a boundary with the main heat transfer portion 31 as a base and an intermediate position between the two first through holes 321a and 321b of the communication portion 32 as vertices. The weir portion 33 has a plurality of convex portions 33C and a plurality of concave portions 33R on both sides thereof. The plurality of convex portions 33C and the plurality of concave portions 33R are the dimensions of the main heat transfer portion 31 in the Y-axis direction, the distance from the first through hole 321 to the main heat transfer portion 31, and the fluids A and B for heat exchange. The arrangement and the form are set according to the type and the like, and the shape and the arrangement are not limited to those shown in FIGS. 5 and 6.

Also in each of these weir portions 33, between the fluids flowing between the first flow path Ra and the second flow path Rb formed on the boundary between the heat transfer plates 3A and 3B (between the first fluid A and the second fluid B). Heat exchange takes place. The plurality of convex portions 33C are included in the plurality of convex portions 3C of the heat transfer plates 3A and 3B, and the plurality of concave portions 33R are included in the plurality of concave portions 3R of the heat transfer plates 3A and 3B.

As shown in FIGS. 5 to 7, the gasket arranging portion 34 is provided at a position where a seal is required between the plates, for example, around the flow paths Ra and Rb and around the first through hole 321. A flat portion 341 extending along the shape and a pair of restricting portions 342 that regulate the movement of the gasket 4 from the flat portion 341 in the width direction (direction along the flat portion 341 and orthogonal to the extending direction of the gasket 4). Have.

In the configuration of the gasket arrangement portion (first gasket arrangement portion) 34A of the first heat transfer plate 3A and the configuration of the gasket arrangement portion (second gasket arrangement portion) 34B of the second heat transfer plate 3B of the present embodiment, Like other parts of the heat transfer plate 3 (parts other than the gasket arrangement part 34), the configuration of the first gasket arrangement part 34A in the first heat transfer plate 3A in a state where the second gasket arrangement part 34B is inverted (a part other than the gasket arrangement part 34). It does not have the same configuration as the uneven arrangement pattern). Specifically, it is as follows.

The flat portion 341 is a strip-shaped flat portion, which is a portion where the gasket 4 is sandwiched between the gasket arrangement portion 34 (specifically, the flat portion 341) of the adjacent heat transfer plates 3, and the first gasket arrangement portion 34A. The flat portion 341 of the above and the flat portion 341 of the second gasket arrangement portion 34B have the same configuration.

The pair of restricting portions 342 are portions provided on both sides of the strip-shaped flat portion 341 in the width direction, that is, on both sides of the gasket 4 located on the flat portion 341 in the width direction. Specifically, each regulating portion 342 is a portion in which convex portions 342C and concave portions 342R are alternately and repeatedly formed in a region adjacent to the flat portion 341 in the extending direction of the flat portion 341.

Each regulating portion 342 of the first gasket arranging portion 34A of the present embodiment and the corresponding regulating portion 342 of the second gasket arranging portion 34B (adjacent in the X-axis direction) are the convex portion 342C in the extending direction of the flat portion 341. And the recess 342R are arranged in the opposite direction. That is, when viewed from the first surface S1 side in a state where the heat transfer plates 3A and 3B are overlapped with each other, the convex portion of the regulation portion 342 of the first gasket arrangement portion 34A in the regulation portion 342 of the second gasket arrangement portion 34B. The portion facing (adjacent) to the portion 342C in the X-axis direction is the concave portion 342R, and the portion facing (adjacent) to the concave portion 342R in the regulating portion 342 of the first gasket arrangement portion 34A is the convex portion. It is 342C (see FIG. 7).

The plurality of convex portions 342C and the plurality of concave portions 342R constituting the regulating portion 342 may be configured to work only as the regulating portion 342. Further, for example, the convex portion 3C and the concave portion 3R having other configurations such as the convex portion 31C and the concave portion 31R of the main heat transfer portion 31 act as the regulating portion 342, that is, the convex portion 3C and the concave portion 3R having other configurations. A part or all of the above may be configured to have both the convex portion 342C and the concave portion 342R of the regulation portion 342. In the heat transfer plates 3A and 3B of the present embodiment, for example, the regulation portion 342 on the main heat transfer portion 31 side of the gasket arrangement portions 34 formed on both sides of the main heat transfer portion 31 in the Y-axis direction is the main heat transfer portion. It is composed of an end portion of the convex portion 31C of the 31 and an end portion of the concave portion 31R. The plurality of convex portions 342C are included in the plurality of convex portions 3C of the heat transfer plates 3A and 3B, and the plurality of concave portions 342R are included in the plurality of concave portions 3R of the heat transfer plates 3A and 3B.

The wall component 30 is arranged along the gasket arrangement portion 34 so as to surround the gasket arrangement portion 34. The wall component 30 of the present embodiment is arranged on the peripheral edge of the heat transfer plates 3A and 3B. The wall component 30 abuts on the wall components 30 of the heat transfer plates 3B and 3A adjacent to each other in the X-axis direction, so that the fluid flows outward from the region surrounded by the gasket 4 (gasket arrangement portion 34) between the plates. When A and B leak, a wall portion 305 is formed to prevent the leaked fluids A and B from leaking from between the plates to the outside of the plate laminated portion 2.

Specifically, the wall component 30 is adjacent to the inner annular portion 301 that surrounds the gasket arrangement portion 34 in a state of being spaced from the gasket arrangement portion 34, and adjacent to the inner annular portion 301 on the outside of the inner annular portion 301. It has an outer annular portion 302 that surrounds the gasket arranging portion 34.

In the first heat transfer plate 3A, the inner annular portion 301 is a portion where the first surface S1 side is concave and the second surface S2 side is convex, and the outer annular portion 302 is a portion where the first surface S1 side is convex and the first surface S1 side is convex. This is a portion where the S2 side of the two surfaces is concave (see FIG. 7). That is, in the first heat transfer plate 3A, the inner annular portion 301 is a ridge surrounding a predetermined region when viewed from the second surface S2 side, and the outer annular portion 302 is viewed from the first surface S1 side. Sometimes it is a ridge that surrounds a given area. On the other hand, in the second heat transfer plate 3B, the inner annular portion 301 is a portion where the first surface S1 side is convex and the second surface S2 side is concave, and the outer annular portion 302 is a portion where the first surface S1 side is concave. This is a portion where the second surface S2 side is convex. That is, in the second heat transfer plate 3B, the inner annular portion 301 is a ridge that surrounds a predetermined region when viewed from the first surface S1 side, and the outer annular portion 302 is viewed from the second surface S2 side. Sometimes it is a ridge that surrounds a given area. The inner annular portion 301 and the outer annular portion 302 of the present embodiment are continuously formed in the width direction of each portion in both the first heat transfer plate 3A and the second heat transfer plate 3B.

In this wall component 30, when a plurality of heat transfer plates 3A and 3B are overlapped to form the plate laminated portion 2, the wall component 30 of the heat transfer plate (for example, the first heat transfer plate) 3A is formed. And the wall constituents 30 of the heat transfer plates (second heat transfer plate on the lower side in FIG. 7) 3B1 adjacent to each other on the other side of the heat transfer plate 3A in the X-axis direction, the tops 301T of the inner annular portions 301 are connected to each other. Are in contact with each other, and the bottom portions 302B of the outer annular portion 302 are separated from each other in the X-axis direction. Further, the wall component 30 of the heat transfer plate 3A and the wall component 30 of the heat transfer plate 3 (the upper second heat transfer plate in FIG. 7) 3B2 adjacent to each other on one side in the X-axis direction of the heat transfer plate 3A. The bottom portions 301B of the inner annular portion 301 are separated from each other in the X-axis direction, and the top portions 302T of the outer annular portion 302 are in contact with each other in the X-axis direction.

The cross-sectional shapes of the top portions 301T and 302T of the inner annular portion 301 and the outer annular portion 302 are arcuate or linear with a small curvature. As a result, even if the positions of the tops 301T and 302T of the inner annular portion 301 and the outer annular portion 302 are slightly displaced due to manufacturing errors or the like (specifically, even if they are displaced in the width direction), the heat transfer plates 3 are overlapped with each other. At that time, the tops 301T and 302T can come into contact with each other.

The positions of the top portions 301T and 302T of the inner annular portion 301 and the outer annular portion 302 in each wall component 30 of the first heat transfer plate 3A and the second heat transfer plate 3B of the present embodiment in the X-axis direction are plates. In a state where the laminated portion 2 is not sandwiched by a pair of frames 5a and 5b, a gap is formed between the convex portions 3C facing each other at other positions when the facing top portions 301T and 302T are in contact with each other. It is set to each position like this. As a result, when the plate laminated portion 2 is sandwiched by a pair of frames 5a and 5b with sufficient force in the X-axis direction so that the sealing property between the heat transfer plates 3A and 3B and the gasket 4 is sufficiently ensured. In addition, the wall portion 305 is configured in a state where the top portions 301T and 302T of the inner annular portion 301 and the outer annular portion 302 are in contact with each other with sufficient force, whereby the sealing property of the wall portion 305 is sufficiently ensured. To.

As shown in FIG. 8, the inner annular portion 301 extends from the bottom portion 301B (the top portion 301T when viewed from the surface opposite to the surface on which the bottom portion 301B is formed) and from the bottom portion 301B, respectively, in the cross-sectional shape. It has a pair of inclined portions 3011 that increase their distance from each other as they are separated from each other. At least one of the pair of inclined portions 3011 has an inclined portion 3011 on one surface (first surface S1) side and the other surface (second surface S2) side of the inclined portion 3011 in the cross section. The wave shape is convex one by one. In the inner annular portion 301 of the present embodiment, each of the pair of inclined portions 3011 has the wavy shape in the cross section.

Further, the outer annular portions 302 extend from the top 302T (the bottom 302B when viewed from the surface opposite to the surface on which the top 302T is formed) in the cross-sectional shape, and are spaced apart from each other as they move away from the top 302T. Has a pair of inclined portions 3021 in which At least one of the pair of inclined portions 3021 has an inclined portion 3021 on one surface (first surface S1) side and the other surface (second surface S2) side of the inclined portion 3021 in the cross section. It has a wave shape that is convex at least one by one. In the outer annular portion 302 of the present embodiment, each of the pair of inclined portions 3021 has the wavy shape in the cross section.

In FIG. 8, only the inclined portion 3021 on the left side has the wavy shape due to the cutting position, but the inclined portion 3021 on the right side has a shape in which unevenness is repeated in the direction from the front to the back, so that the cut portion is cut. By shifting the position to the front side or the back side of FIG. 8 (specifically, shifting by half the pitch of the uneven pitch), the inclined portion 3021 on the right side also has the wave shape. Further, the inner annular portion 301 and the outer annular portion 302 of the present embodiment are adjacent (continuous) in the width direction. Then, the inclined portion 3011 on the outer annular portion 302 side of the pair of inclined portions 3011 of the inner annular portion 301 and the inclined portion 3021 on the inner annular portion 301 side of the pair of inclined portions 3021 of the outer annular portion 302 are formed. , Formed by a common portion of the heat transfer plate 3.

Returning to FIGS. 3A, 5 and 6, the pair of guide notches 35 are arranged at the center of the heat transfer plates 3A and 3B in the Y-axis direction at each end in the Z-axis direction. The pair of guide notches 35 of the present embodiment have a line-symmetrical shape with the horizontal center line CL2 as the axis of symmetry.

As shown in FIGS. 4, 7, 9, and 10, each of the plurality of gaskets 4 defines a flow path Ra and Rb between the plates of two adjacent heat transfer plates 3A and 3B. The portion 41 has an annular portion 42 for communicating the first through holes 321 of the adjacent heat transfer plates 3A and 3B, and a connecting portion 43 for connecting the flow path defining portion 41 and the annular portion 42. The gasket 4 of the present embodiment has one flow path delimiter 41, two annular portions 42, and four connecting portions 43. In this gasket 4, the shape of the cross section at each portion is the rectangular main seal portion 45 arranged on the flat portion 341 of the gasket arrangement portions 34A and 34B, and the X-axis at both ends of the main seal portion 45 in the width direction. Includes a pair of anti-displacement portions 46 extending outward in the width direction and convex on one side in the X-axis direction from a portion on one side in the direction (upper side in FIG. 7).

The main seal portion 45 is a portion for ensuring liquidtightness between the gasket 4 and the heat transfer plates 3A and 3B by being sandwiched between the two heat transfer plates 3A and 3B, and is a pair of slip prevention portions 46. Is a portion for suppressing the deviation (movement) in the width direction of the main seal portion 45 by being sandwiched between the two heat transfer plates 3A and 3B. Further, each of the slip prevention portions 46 is sandwiched between the two heat transfer plates 3A and 3B to prevent air or fluids A and B from coming into contact with the main seal portion 45, whereby the air in the main seal portion 45 is prevented. Alternatively, deterioration due to contact with the fluids A and B can be prevented.

The flow path defining portion 41 corresponds to the main heat transfer portion 31, the pair of weir portions 33, and the communication portions 32u and 32d when viewed from the X-axis direction (in the example of the present embodiment, the vertical center line CL1 is used. Two first through holes 321 (located on the same side with respect to each other), a part of communication portions 32u and 32d (specifically, a portion between the two first through holes 321 and each weir portion 33), and It is the part that surrounds. Further, each of the two annular portions 42 is a portion surrounding the first through hole 321 located outside the flow path defining portion 41 when viewed from the X-axis direction. In the gasket 4 of the present embodiment, one annular portion 42 is connected to the flow path defining portion 41 by two connecting portions 43.

In the plate laminated portion 2 having the heat transfer plates 3A and 3B and the gasket 4 configured as described above, as shown in FIGS. 3A to 4, 9 and 10, two types of heat transfer plates 3A and 3B Are alternately superimposed in the X-axis direction. At this time, the plurality of gaskets 4 are arranged (sandwiched) between the plates of the two adjacent heat transfer plates 3A and 3B, but the plurality of gaskets 4 are rotated half a turn every other time. It is arranged between each plate in the state. In the plate laminated portion 2 of the present embodiment, the counter-rotation of the gasket 4 is the vertical center line CL3 (see FIGS. 9 and 10) extending in the Z-axis direction at the center in the Y-axis direction and the Y-axis at the center in the Z-axis direction. It is rotated by 180 ° with the intersection with the horizontal center line CL4 (see FIGS. 9 and 10) extending in the direction as the center of rotation. In the plate laminated portion 2 of the present embodiment, a plurality of heat transfer plates 3A and 3B are vertically overlapped with each other so as to be separable.

By superimposing the plurality of heat transfer plates 3A and 3B in the X-axis direction with the gasket 4 sandwiched between the plates in this way, the plate laminated portion 2 (heat exchanger 1) is formed. A flow path forming portion 21 in which flow paths Ra and Rb are formed between the plates, a gasket holding portion 22 surrounding the flow path forming portion 21, and a flow outside the gasket holding portion 22 flow in the plate laminated portion 2. An outer seal portion 23 surrounding the road forming portion 21 is formed (see FIGS. 3B and 8). In FIG. 3B, a smoke is attached to the front view of the plate laminated portion 2 to show the range of the flow path forming portion 21, the gasket sandwiching portion 22, and the outer sealing portion 23.

In the plate laminated portion 2, the flow path forming portion 21 includes a main heat transfer portion 31, a pair of weir portions 33, and a part of a pair of communication portions 32 (the first through hole 321 and the weir portion 33). It is a part corresponding to the part between). In the flow path forming portion 21, the first flow path Ra that allows the first fluid A to flow in the Z-axis direction and the second flow path Ra that allows the second fluid B to flow in the Z-axis direction are defined by the heat transfer plates 3A and 3B. The flow paths Rb are alternately formed. That is, in a plurality of heat transfer plates 3A and 3B superposed in the X-axis direction, a second flow path Rb is formed between the first surface S1 and the second surface S2 of the adjacent heat transfer plates 3B and 3A. At the same time, the first flow path Ra is formed between the first surface S1 and the second surface S2 of the adjacent heat transfer plates 3A and 3B.

The gasket sandwiching portion 22 is a portion of the plate laminated portion 2 in which the gasket 4 is sandwiched between the plates and the gaskets 4 sandwiched between the plates are arranged in the X-axis direction. Specifically, the gasket sandwiching portion 22 is a portion of the plate laminated portion 2 corresponding to the outermost frame-shaped portion (closed portion) of the gasket arranging portions 34A and 34B when viewed from the X-axis direction (FIG. 3B). reference).

In the gasket sandwiching portion 22, between the plates, the main sealing portion 45 of the gasket 4 is sandwiched between the flat portions 341 and the displacement preventing portions 46 are sandwiched between the regulating portions 342. The gaskets 4 sandwiched between the gaskets 4 are arranged straight in the X-axis direction (see FIG. 8).

The outer seal portion 23 is at least one wall portion formed by abutting the facing portions 301 and 302 of the two heat transfer plates 3A and 3B sandwiching the gasket 4 in the gasket sandwiching portion 22 in the X-axis direction. Has 305. In the outer seal portion 23 of the present embodiment, wall portions 305 are formed at positions (layers) corresponding to the respective flow paths Ra and Rb of the flow path forming portion 21 in the X-axis direction. That is, the outer seal portion 23 has a plurality of wall portions 305.

Specifically, in the outer seal portion 23, as shown in FIGS. 7 and 8, the top portions 301T of the adjacent inner annular portions (convex) 301 of the adjacent heat transfer plates 3A and 3B are in contact with each other and the inner side wall portion. 305A is formed. Further, the top portions 302T of the adjacent outer annular portions (convex) 302 of the adjacent heat transfer plates 3A and 3B are in contact with each other to form the outer wall portion 305B. A plurality of inner side wall portions 305A and a plurality of outer wall portions 305B are formed on the outer seal portion 23, and the inner side wall portion 305A and the outer wall portion 305B are formed in different layers in the X-axis direction. In the outer seal portion 23 of the present embodiment, the inner side wall portion 305A and the outer wall portion 305B are alternately formed in the X-axis direction.

Leakage space Rg is formed between the gasket sandwiching portion 22 and the outer sealing portion 23 in each layer of the plate laminated portion 2. This leakage space Rg is a space formed between the wall portion 305 of the two heat transfer plates 3A and 3B adjacent to each other (opposing each other) in the X-axis direction and the gasket 4 of the gasket sandwiching portion 22 (FIG. 9). And the range shown by smoke in FIG. 10).

Specifically, in each layer of the plate laminated portion 2, between the gasket 4 of the gasket sandwiching portion 22 in the two heat transfer plates 3A and 3B forming the first flow path Ra and the outer wall portion 305B on the outer side of the gasket 4. The first leakage space Rg1 defined in the above, the gasket 4 of the gasket sandwiching portion 22 in the two heat transfer plates 3B and 3A forming the second flow path Rb, and the inner side wall portion 305A on the outer side of the gasket 4. A second leak space Rg2 defined between them is formed. In the plate laminated portion 2 of the present embodiment, since the first flow path Ra and the second flow path Rb are alternately formed in the X-axis direction, the first leakage space Rg1 and the second leakage space Rg are also formed in the leakage space Rg. Rg2 and Rg2 are alternately formed in the X-axis direction. The leak space Rg of each layer of the plate laminated portion 2 is formed in the entire area in the circumferential direction between the gasket holding portion 22 and the wall portion 305.

Further, as described above, the plate laminated portion 2 has a pair of first series passages Rc1 and Rc2, a pair of second series passages Rd1 and Rd2, two first leak detection passages Re, and two second passages. (2) A leak detection flow path Rf is formed (see FIGS. 1 and 4).

Each of the pair of first series passages Rc1 and Rc2 is formed by connecting the corresponding first through holes 321a of the plurality of heat transfer plates 3A and 3B in the X-axis direction via the annular portion 42 of the gasket 4. , Communicating with each first flow path Ra. As a result, as described above, the first series passage Rc1 of one of the pair of first series passages Rc1 and Rc2 (upper side in FIG. 4) allows the first fluid A to be introduced from the outside of the plate laminated portion 2. The first flow path Rc2 flows into one flow path Ra and the other (lower side in FIG. 4) causes the first fluid A to flow out from each first flow path Ra to the outside of the plate laminated portion 2.

Further, each of the pair of second communication passages Rd1 and Rd2 is formed by connecting the corresponding first through holes 321b of the plurality of heat transfer plates 3 in the X-axis direction via the annular portion 42 of the gasket 4. It communicates with each second flow path Rb. As a result, as described above, the second passage Rd1 of one of the pair of second passages Rd1 and Rd2 (upper side in FIG. 4) allows the second fluid B to be introduced from the outside of the plate laminated portion 2. The second passage Rd2 of the other (lower side in FIG. 4) flows into the two flow paths Rb, and the second fluid B flows out from each second flow path Rb to the outside of the plate laminated portion 2.

Each of the two first leakage detection flow paths Re is formed by connecting the corresponding second through holes 322b of the plurality of heat transfer plates 3A and 3B in the X-axis direction. Then, in the layer in which the first flow path Ra and the first leakage space Rg1 are formed in the plate laminated portion 2, the second through hole peripheral portions 3220 of the second through hole 322b constituting the first leakage detection flow path Re are connected to each other. Since they are separated from each other in the X-axis direction, each of the two first leak detection flow paths Re communicates with the first leak space Rg1. As a result, when the first fluid A leaks from the first flow path Ra into the first leak space Rg1, the leaked first fluid A is discharged to the outside through the first leak detection flow path Re, thereby causing the plate. It is possible to detect that a liquid leak has occurred from any of the first flow paths Ra in the laminated portion 2.

The two first leak detection flow paths Re of the present embodiment are formed at both ends (upper end and lower end) in the Z-axis direction at the other end in the Y-axis direction (left side in FIG. 4). Normally, the fluid A leaking from the first flow path Ra to the first leakage space Rg1 is discharged to the outside from the first leakage detection flow path Re at the lower end.

On the other hand, in the layer in which the second flow path Rb and the second leakage space Rg2 are formed in the plate laminated portion 2, the second through hole peripheral portions 3220 of the second through hole 322b constituting the first leakage detection flow path Re are connected to each other. Are in contact with each other in the X-axis direction, so that each of the two first leak detection flow paths Re does not communicate with the second leak space Rg2. As a result, even if the second fluid B leaks from the second flow path Rb into the second leak space Rg2, the leaked second fluid B does not flow into the first leak detection flow path Re. That is, the first leak detection flow path Re communicates only with each first leak space Rg1 and does not communicate with each second leak space Rg2.

Further, each of the two second leakage detection flow paths Rf is formed by connecting the corresponding second through holes 322a of the plurality of heat transfer plates 3A and 3B in the X-axis direction, as shown in FIG. ing. Then, in the layer in which the second flow path Rb and the second leakage space Rg2 are formed in the plate laminated portion 2, the second through hole peripheral portions 3220 of the second through hole 322a constituting the second leakage detection flow path Rf are connected to each other. Are separated from each other in the X-axis direction, so that each of the two second leak detection flow paths Rf communicates with the second leak space Rg2. As a result, when the second fluid B leaks from the second flow path Rb to the second leak space Rg2, the leaked second fluid B is discharged to the outside through the second leak detection flow path Rf, whereby the leaked second fluid B is discharged to the outside. It is possible to detect that a liquid leak has occurred from any of the second flow paths Rb in the plate laminated portion 2.

The two second leak detection flow paths Rf of the present embodiment are formed at both ends (upper end and lower end) in the Z-axis direction at the end on one side (right side in FIG. 4) in the Y-axis direction. Normally, the fluid B leaking from the second flow path Rb to the second leakage space Rg2 is discharged to the outside from the second leakage detection flow path Rf at the lower end.

On the other hand, in the layer in which the first flow path Ra and the first leakage space Rg1 are formed in the plate laminated portion 2, the second through hole peripheral portions 3220 of the second through hole 322a constituting the second leakage detection flow path Rf are connected to each other. Since they are in contact with each other in the X-axis direction, each of the two second leak detection flow paths Rf does not communicate with the first leak space Rg1. As a result, even if the first fluid A leaks from the first flow path Ra into the first leak space Rg1, the leaked first fluid A does not flow into the second leak detection flow path Rf. That is, the second leak detection flow path Rf communicates only with each second leak space Rg2 and does not communicate with each first leak space Rg1.

Returning to FIGS. 1, 2, and 4, each of the pair of frames 5a and 5b is a thick plate-shaped member having a shape corresponding to the heat transfer plates 3A and 3B when viewed from the X-axis direction.

One of the frames 5a of the pair of frames 5a and 5b has a rectangular thick plate shape that is long in the Z-axis direction, and each of the first through holes 321 of the heat transfer plates 3A and 3B (each communication passage Rc1, Rc2, A plurality of large-diameter through holes 51 (four in the example of this embodiment) penetrating in the same direction at positions overlapping with Rd1 and Rd2) when viewed from the X-axis direction, and second penetrations of the heat transfer plates 3A and 3B. It has a plurality of small-diameter through holes 52 (four in the example of this embodiment) penetrating in the same direction at positions overlapping with the holes 322 (each leak detection flow path Re, Rf) when viewed from the X-axis direction. Further, one frame 5a has a plurality of notches 53 arranged at both ends in the Y-axis direction at intervals in the Z-axis direction.

Further, the other frame 5b of the pair of frames 5a and 5b has a rectangular thick plate shape that is long in the Z-axis direction, and a plurality of notches arranged at both ends in the Y-axis direction at intervals in the Z-axis direction. It has a portion 54. Each of the plurality of notch portions 54 is arranged at a position where they overlap with each notch portion 53 of one frame 5a when viewed from the X-axis direction.

Each of the guide portions 6 has a pair of guide bars 61 extending in the X-axis direction. Further, the guide portion 6 of the present embodiment also has a support member 62 that maintains a distance between the ends of the pair of guide bars 61.

The pair of guide bars 61 extend parallel to each other from both ends of one frame 5a in the Z-axis direction. These pair of guide bars 61 guide the other frame 5b so as to be able to be attached to and detached in the X-axis direction in a state (posture) parallel to the one frame 5a. Further, each of the pair of guide bars 61 is fitted into the guide notches 35 at both ends of the heat transfer plate 3 in the Z-axis direction to guide each heat transfer plate 3 to the arrangement position.

The support member 62 extends in the Z-axis direction, and by connecting the ends of the pair of guide bars 61 (the ends connected to one frame 5a and the end opposite to the end), the ends thereof are connected to each other. Maintain the interval.

Each of the plurality of tightening members 7 has a bolt 71 extending in the X-axis direction and a nut 72 screwed with the bolt 71. Each tightening member 7 is fitted in the corresponding notches 53, 54 of the pair of frames 5a and 5b (overlapping when viewed from the X-axis direction), and the pair of frames is in a direction in which the distance in the X-axis direction becomes smaller. Tighten 5a and 5b. By tightening the pair of frames 5a and 5b by the plurality of tightening members 7, the gaskets 4 arranged between the plates are sandwiched with sufficient force, whereby the flow paths Ra formed between the plates, Rb becomes liquid-tight.

In the heat exchanger 1 configured as described above, when the first fluid A is supplied to one first series passage Rc1 and the second fluid B is supplied to one second series passage Rd1, the second fluid B is supplied. One fluid A flows into each first flow path Ra from one first series passage Rc1, and the second fluid B flows into each second flow path Rb from one second continuous passage Rd1.

As a result, in the heat exchanger 1, the first fluid A flows in the first flow path Ra in the Z-axis direction, and the second fluid B flows in the second flow path Rb in the Z-axis direction. Specifically, the first fluid A passes (flows) between the plates defining the first flow path Ra from one end in the Z-axis direction toward the other end, and the second fluid B defines the second flow path Rb. Passes (circulates) between the plates to be processed from one end in the Z-axis direction toward the other end. At this time, the first fluid A and the second fluid B exchange heat via the heat transfer plates 3A and 3B (mainly the main heat transfer unit 31) between the first flow path Ra and the second flow path Rb. ..

Then, the first fluid A that has completed heat exchange flows out from each first flow path Ra to the other first series passage Rc2, and is discharged to the outside through the first series passage Rc2. Further, the second fluid B that has completed heat exchange flows out from each second flow path Rb to the other second communication passage Rd2, and is discharged to the outside through the second communication passage Rd2.

In a state where the first fluid A and the second fluid B are flowing through the heat exchanger 1, the first fluid A leaks from the first flow path Ra or the first series passages Rc1 and Rc2 to the first leakage space Rg1. At that time, the leaked first fluid A is discharged to the outside through the first leak detection flow path Re. On the other hand, when the second fluid B leaks from the second flow path Rb or the second continuous passages Rd1 and Rd2 to the second leak space Rg2, the leaked second fluid B passes through the second leak detection flow path Rf. It is discharged to the outside.

In the above heat exchanger 1, the wall portion 305 surrounds the flow path forming portion 21 on the outside of the gasket holding portion 22, so that the gasket holding portion 22 forms the two heat transfer plates 3A and 3B constituting the wall portion 305. The movement of air from the outside between the heat transfer plates 3A and 3B to the sandwiched gasket 4 side is suppressed, that is, the contact with the external air in the gasket 4 is suppressed, whereby the gasket 4 is suppressed. Deterioration (oxidation, etc.) caused by contact with air is suppressed.

Further, in the heat exchanger 1 of the present embodiment, a plurality of heat transfer plates 3A and 3B are separately overlapped in the plate laminated portion 2, and each wall portion 305 sandwiches the gasket 4 by the gasket holding portion 22. In the two heat transfer plates (heat transfer plate pair) 3A and 3B, the tops 301T and 302T of the inner annular portion (convex) 301 or the outer annular portion (convex) 302 that are convex in the direction of approaching each other are in contact with each other. It is formed by contact. Then, in the cross section of each inner annular portion 301 or each outer annular portion 302, the annular portions 301 and 302 extend from the top portions 301T and 302T, respectively, and the distance between the annular portions 301T and 302T increases as the distance from the top portions 301T and 302T increases. It has inclined portions 3011 and 3021, and each inclined portion 3011 and 3021 has one surface side (for example, the first surface S1 side) and the other surface side (for example, the second surface S2 side) of the inclined portions 3011 and 3021. ) And at least one convex wave shape.

In this way, by making the cross-sectional shape of each of the inclined portions 3011 and 3021 a wave shape, the inclined portions 3011 and 3021 can be provided with a spring property, so that the plurality of heat transfer plates 3A and 3B can be provided in the X-axis direction. The force in the X-axis direction applied to each annular portion (inner annular portion 301, outer annular portion 302) constituting the wall portion 305 when the plate laminated portion 2 is formed by overlapping is absorbed by the elastic deformation of the inclined portions 3011 and 3021. Can be made to. As a result, it is possible to suppress deformation such as dents caused by the force in the X-axis direction in each annular portion (inner annular portion 301, outer annular portion 302).

Moreover, by giving the inclined portions 3011 and 3021 a spring property, when the plate laminated portion 2 is disassembled and the heat transfer plates 3A and 3B are separated, each annular portion (inner annular portion 301, outer annular portion 301) is formed. Since the deformation does not remain or is difficult to remain in the portion 302), that is, the shape after the elastic deformation returns to the original state (substantially) by the separation of the heat transfer plates 3A and 3B, the heat transfer plates 3A and 3B are returned again. The plate laminated portion 2 can be overlapped to form (reuse).

Further, in the heat exchanger 1 of the present embodiment, the plate laminated portion 2 has a plurality of wall portions 305 arranged at positions (same layer) corresponding to each gasket 4 sandwiched between the plates in the gasket sandwiching portion 22. Each heat transfer plate 3A and 3B is provided on the outside of the gasket sandwiching portion 22, and is between a portion constituting the gasket sandwiching portion 22 and a portion constituting the wall portion 305 (inner annular portion 301, outer annular portion 302). Has a second through hole (first hole portion and second hole portion) 322 penetrating in the X-axis direction. Then, in the plate laminated portion 2, the plurality of heat transfer plates 3A and 3B have the first flow path Ra through which the first fluid A flows and the second flow path Rb through which the second fluid B flows, respectively. It is formed alternately in the X-axis direction. Further, the second through holes (first hole portions) 322b of the heat transfer plates 3A and 3B are connected in the X-axis direction to form the first flow path Ra, and the gasket holding portions in the two heat transfer plates 3A and 3B. A first leak detection flow path Re that communicates with each first leak space Rg1 defined between the gasket 4 of 22 and the inner side wall portion 305A on the outer side of the gasket 4 is configured. Further, the second through holes (second hole portions) 322a of the heat transfer plates 3A and 3B are connected in the X-axis direction to form the second flow path Rb, and the gaskets are sandwiched between the two heat transfer plates 3A and 3B. A second leak detection flow path Rf that communicates with each second leak space Rg2 defined between the gasket 4 of the portion 22 and the outer wall portion 305B on the outer side of the gasket 4 is configured.

As described above, since the plate laminated portion 2 has the first leakage detection flow path Re communicating with each first leakage space Rg1 and the second leakage detection flow path Rf communicating with each second leakage space Rg2. Which of the first fluid A and the second fluid B is discharged in the gasket sandwiching portion 22 depending on which of the first leak detection flow path Re and the second leak detection flow path Rf the fluid is discharged from. It is possible to detect whether a leak has occurred. Further, even if both the first fluid A and the second fluid B leak in the gasket sandwiching portion 22, they do not come into contact with the first fluid A and the second fluid B and have different paths (first leak). It can be discharged to the outside through the detection flow path Re and the second leak detection flow path Rf).

The plate heat exchanger of the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. In addition, some of the configurations of certain embodiments can be deleted.

In the heat exchanger 1 of the above embodiment, the two types of heat transfer plates 3A and 3B are alternately superposed in the plate laminated portion 2, but the configuration is not limited to this. For example, in the plate stacking portion 2, one type of heat transfer plate 3 may be stacked in the X-axis direction in a state of being inverted every other plate.

In the heat exchanger 1 of the above embodiment, the first fluid A is supplied from one first series passage Rc1 into the plate laminated portion 2, and the second fluid B is supplied from one second continuous passage Rd1 into the plate laminated portion 2. It is supplied to, but is not limited to this configuration. For example, the second fluid B may be supplied from one second continuous passage Rd1 into the plate laminated portion 2, while the first fluid A may be supplied from the other first series passage Rc2 into the plate laminated portion 2. The first fluid A may be supplied from one first series passage Rc1 into the plate laminated portion 2, while the second fluid B may be supplied from the other second continuous passage Rd2 into the plate laminated portion 2. Further, the first fluid A may be supplied from the other first series passage Rc2 into the plate laminated portion 2, and the second fluid B may be supplied from the other second continuous passage Rd2 into the plate laminated portion 2. ..

Further, in the plate laminated portion 2 of the above embodiment, the wall portion 305 is arranged so as to surround the flow path forming portion 21 on the outside of the gasket holding portion 22 (the side opposite to the flow path forming portion 21 side). It is not limited to this configuration. The wall portion 305 may be arranged so as to surround the flow path forming portion 21 inside the gasket holding portion 22 (on the side of the flow path forming portion 21). According to such a configuration, the movement of the fluids A and B from the flow paths Ra and Rb between the plates to the gasket holding portion 22 (gasket 4) side is suppressed by the wall portion 305. As a result, damage or deterioration of the gasket 4 due to contact with the fluids A and B in the gasket sandwiching portion 22 can be suppressed. Further, in the plate laminated portion 2, the wall portion 305 may be arranged on both sides (inside and outside) of the gasket holding portion 22.

Further, in the plate laminated portion 2 of the above embodiment, the wall portion 305 is formed in each layer in the X-axis direction, but the configuration is not limited to this. The wall portion 305 may be formed in a partial layer of the plate laminated portion 2. That is, the plate laminated portion 2 may have at least one wall portion 305.

Further, in the plate laminated portion 2 of the above embodiment, in the cross-sectional shape of the annular portion (inner annular portion 301, outer annular portion 302) constituting the wall portion 305, a pair of inclined portions constituting the annular portions 301 and 302. Both 3011 and 3021 are wavy, but are not limited to this configuration. In the cross-sectional shape, at least one of the pair of inclined portions 3011 and 3021 constituting the annular portions 301 and 302 may have a wavy shape. Even with this configuration, the force applied in the X-axis direction to the annular portions 301 and 302 constituting the wall portion 305 when the plurality of heat transfer plates 3 are superposed on each other in the X-axis direction to form the plate laminated portion 2 is applied to the inclined portion. It is absorbed by the elastic deformation of 3011 and 3021, whereby the deformation such as the dent caused by the force in the X-axis direction at each of the annular portions 301 and 302 is suppressed. Further, by giving springiness to at least one of the inclined portions 3011 and 3021, when the plate laminated portion 2 is disassembled and the heat transfer plates 3 are separated, the cross section of the annular portions 301 and 302 has a wavy shape. No deformation remains or is unlikely to remain on the inclined portions 3011 and 3021 of the above, that is, the shape after the elastic deformation is restored by the separation of the heat transfer plates 3, so that the heat transfer plates 3 are overlapped again and the plate laminated portion. 2 can be formed (reused). In the annular portions (opposing annular portions) 301 and 302 that bring the top portions 301T and 302T into contact with each other, only one of the annular portions 301 and 302 has an inclined portion (inclined portion having a wavy cross section) 3011 and 3021. You may be doing it.

Here, when the heat transfer plate 3 after being separated from the plate laminated portion 2 is not overlapped (that is, not reused) again, the pair of inclined portions 3011 and 3021 constituting the annular portions 301 and 302 are not stacked. Both cross-sectional shapes may have a shape other than the wave shape (a shape such as a straight line that does not cause springiness).

Further, in the wall component 30 of the heat transfer plate 3 of the above embodiment, the inner annular portion 301 and the outer annular portion 302 are adjacent (continuously) in a state where a part (one inclined portion 3011, 3021) is shared. However, it is not limited to this configuration. The inner annular portion 301 and the outer annular portion 302 may be arranged at intervals from each other. Further, the heat transfer plate may have a configuration without the inner annular portion 301 or a configuration without the outer annular portion 302.

Further, in the plate laminated portion 2 of the above embodiment, one wall portion 305 is arranged in one layer, but a plurality of wall portions 305 may be arranged in one layer.

Further, the specific cross-sectional shape of each portion (opposing portion) constituting the wall portion 305 in the two heat transfer plates 3 adjacent to each other in the X-axis direction is not limited. For example, both parts do not have to have the same cross-sectional shape, such as a shape in which the cross section of one part is flat and the cross section of the other part is convex toward one part. That is, when the opposing portions 301 and 302 of the two heat transfer plates 3 adjacent to each other in the X-axis direction abut in the X-axis direction, the contact portion 305 is sandwiched between the inside (the flow path forming portion 21 side) and the outside. The shape may be any shape that hinders (blocks) the movement of the air or heat exchange target fluids A and B to (outside the plate laminated portion 2) or from the outside to the inside.

Further, in the heat exchanger 1 of the above embodiment, spaces (distance between the bottom portions 301B and 302B of the adjacent annular portions 301 and 302) are formed on both sides of each wall portion 305 in the X-axis direction (FIG. 8). (See), but is not limited to this configuration. For example, as shown in FIG. 12, the plate laminated portion 2 has an auxiliary gasket 4A arranged on at least one of the wall portions 305 in the X-axis constant direction, and the auxiliary gasket 4A has the wall portion 305 and the wall portion. The heat transfer plate 3 adjacent to the 305 in the X-axis direction (for example, the heat transfer plate 3 on the upper side of the auxiliary gasket 4A arranged on the upper side of the wall portion 305 in FIG. 12) is pressed in a direction away from each other. There may be. According to this configuration, the portion of one heat transfer plate 3A (inner annular portion (convex) 301 or outer annular portion (convex) 302) constituting the wall portion 305 is the other transfer constituting the wall portion 305. Since the auxiliary gasket 4A pushes toward the portion of the heat plate 3B (inner annular portion (convex) 301 or outer annular portion (convex) 302), the two heat transfer plates 3A and 3B constituting the wall portion 305. The movement of air or fluid to the gasket holding portion 22 side (gasket 4 side) through the portions (inner annular portion (convex) 301 or outer annular portion (convex) 302) is more reliably suppressed.

In this case, the gasket 4 and the auxiliary gasket 4A arranged between the plates on which the gasket 4 is arranged in the plate laminated portion 2 may be separate or integrated. Here, the auxiliary gasket 4A may be arranged only between all or a part of the plates defining the first flow path Ra in the plate laminated portion 2. Further, the auxiliary gasket 4A may be arranged only between all or a part of the plates defining the second flow path Rb in the plate laminated portion 2. Further, the auxiliary gasket 4A is arranged in the plate laminated portion 2 between all or a part of the plates defining the first flow path Ra and between all or a part of the plates defining the second flow path Rb. May be good.

Further, the heat exchanger 1 of the above embodiment includes the first leak detection flow path Re and the second leak detection flow path Rf, but is not limited to this configuration. The heat exchanger 1 may be configured to include only one of the first leak detection flow path Re and the second leak detection flow path Rf. According to such a configuration, it is possible to detect a leak of a fluid (first fluid or second fluid) corresponding to the arranged leak detection flow path (first leak detection flow path Re or second leak detection flow path Rf). can.

Further, the heat exchanger 1 may be configured not to include a leak detection flow path (first leak detection flow path Re and second leak detection flow path Rf).

Further, the leak detection flow path Re or Rf is not limited to a configuration in which the leak detection flow path Re or Rf communicates only with each first leak space Rg1 or communicates only with each second leak space Rg2. If there is no problem even if the first fluid A and the second fluid B through which heat exchange is performed in the heat exchanger 1 come into contact with each other, the leak detection flow path is the first leak space Rg1 and each second leak space. It may be configured to communicate with Rg2.

1 ... heat exchanger, 2 ... plate laminated part, 21 ... flow path forming part, 22 ... gasket sandwiching part, 23 ... outer seal part, 3 ... heat transfer plate, 3A ... first heat transfer plate (heat transfer plate), 3B, 3B1, 3B2 ... 2nd heat transfer plate (heat transfer plate), 30 ... wall component, 301 ... inner annular part, 302 ... outer annular part, 301B, 302B ... bottom, 301T, 302T ... top, 3011, 3021 ... Inclined part, 305 ... Wall part, 305A ... Inner side wall part, 305B ... Outer wall part, 31 ... Main heat transfer part, 32, 32d, 32u ... Communication part, 321, 321a, 321b ... First through hole, 322, 322a, 322b ... Second through hole, 3220 ... Second through hole peripheral part, 33 ... Dam part, 34 ... Gasket arrangement part, 34A ... First gasket arrangement part (gasket arrangement part), 34B ... Second gasket arrangement part ( Gasket placement part), 341 ... Flat part, 342 ... Regulatory part, 3C, 31C, 32C, 33C, 342C ... Convex part, 3R, 31R, 32R, 33R, 342R ... Concave part, 4 ... Gasket, 4A ... Auxiliary gasket, 41 ... Flow path demarcation part, 42 ... Circular part, 43 ... Connection part, 45 ... Main seal part, 46 ... Misalignment prevention part, 5a, 5b ... Frame, 51 ... Large diameter through hole, 52 ... Small diameter through hole, 53, 54 ... notch, 6 ... guide, 61 ... guide bar, 62 ... support member, 7 ... tightening member, 71 ... bolt, 72 ... nut, 500 ... plate heat exchanger, 501 ... heat transfer plate, 502 ... gasket , A ... first fluid (fluid), B ... second fluid (fluid), CL1, CL3 ... vertical center line, CL2, CL4 ... horizontal center line, R ... flow path, Ra ... first flow path (flow path), Rb ... Second flow path (flow path), Rc, Rc1, Rc2 ... First series passage (continuous passage), Rd, Rd1, Rd2 ... Second continuous passage (continuous passage), Re ... First leak detection flow path ( Leakage detection flow path), Rf ... Second leak detection flow path (leakage detection flow path), Rg ... Leakage space, Rg1 ... First leakage space (leakage space), Rg2 ... Second leakage space (leakage space), S1 ... First surface, S2 ... second surface, T1 ... first area, T2 ... second area

Claims (4)

A fluid can flow between the plurality of heat transfer plates stacked in a predetermined direction and the two heat transfer plates adjacent to each other in the predetermined direction among the plurality of heat transfer plates. A plate laminate with a plurality of gaskets forming a flow path,
The plate laminated portion is
A flow path forming portion in which the flow path is formed between the heat transfer plates, and a flow path forming portion.
The gasket is sandwiched between the heat transfer plates, and the gasket sandwiched between the heat transfer plates is a gasket holding portion in which the gaskets are arranged in a predetermined direction, and the gasket holding portion surrounds the flow path forming portion. When,
It has at least one wall portion formed by abutting the facing portions of the two heat transfer plates sandwiching the gasket in the predetermined direction in the gasket sandwiching portion.
The at least one wall portion surrounds the flow path forming portion on at least one of the inner side of the flow path forming portion side and the outer side opposite to the flow path forming portion side with respect to the gasket holding portion. Plate heat exchanger. In the plate stacking portion, the plurality of heat transfer plates are stacked so as to be separable from each other.
The at least one wall portion is formed by abutting the tops of ridges that are convex in the direction of approaching each other in two heat transfer plates sandwiching the gasket.
In the cross section of at least one of the ridges where the tops abut.
The ridges each have a pair of sloping portions that extend from the apex and increase in distance from each other as they move away from the apex.
At least one inclined portion of the pair of inclined portions has a wave shape so as to be convex at least one on one surface side and the other surface side of the heat transfer plate constituting the inclined portion. The plate heat exchanger according to claim 1. The plate laminated portion has an auxiliary gasket arranged on at least one side of the wall portion in the predetermined direction.
The plate heat exchanger according to claim 1 or 2, wherein the auxiliary gasket presses the wall portion and the heat transfer plate adjacent to the wall portion in a predetermined direction in a direction away from each other. The plate laminated portion has a plurality of wall portions arranged at positions corresponding to the gaskets sandwiched between the heat transfer plates in the gasket holding portion on the outer side of the gasket holding portion.
Each heat transfer plate has a first hole portion and a second hole portion penetrating in the predetermined direction between the portion constituting the gasket sandwiching portion and the portion constituting the wall portion.
In the plate laminated portion,
In the plurality of heat transfer plates, a first flow path through which the first fluid flows and a second flow path through which the second fluid flows are alternately formed in the predetermined direction via the heat transfer plates.
The first hole portion of each heat transfer plate is connected in the predetermined direction to form the first flow path, the gasket of the gasket holding portion in the two heat transfer plates, and the outer side of the gasket. A first leak detection flow path that communicates with each first leak space defined between the wall and the wall is configured.
The second hole portion of each heat transfer plate is connected in the predetermined direction to form the second flow path, the gasket of the gasket holding portion in the two heat transfer plates, and the outer side of the gasket. The plate heat exchanger according to any one of claims 1 to 3, which constitutes a second leak detection flow path communicating with each second leak space defined between the wall portion.

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