JP6917236B2 - Plate heat exchanger - Google Patents

Description

The present invention relates to a plate heat exchanger having a plurality of stacked heat transfer plates and defining a flow path by adjacent heat transfer plates.

Conventionally, a plate type heat exchanger has been provided as one of the heat exchangers for heat exchange between fluids.

The plate heat exchanger includes a plurality of heat transfer plates. Each of the plurality of heat transfer plates has a first surface in the first direction and a second surface opposite to the first surface. Each of the plurality of heat transfer plates includes a heat transfer portion in which a plurality of recesses and ridges extending in a direction intersecting the first direction are arranged on each of the first surface and the second surface. The plurality of heat transfer plates are stacked in the first direction so that the heat transfer portions overlap each other, and the adjacent heat transfer plates are sealed along the heat transfer portion. In this state, each of the plurality of heat transfer plates has its first surface facing the first surface of the heat transfer plates adjacent to each other on one side in the first direction, and the heat transfer plates adjacent to each other on the other side in the first direction. The second surface of the heat plate is opposed to the second surface of the heat plate, and a flow path for flowing a fluid is formed between the first surface and the second surface, respectively.

In this type of plate heat exchanger, the edges of adjacent heat transfer plates, which extend in the same direction or substantially the same direction as the fluid flow in the flow path, are liquid-tightly connected to each other. In some cases, the inlet and outlet of the flow path are defined by the edge of the heat transfer plate extending in the direction intersecting the flow direction of the fluid in the flow path (see, for example, Patent Document 1).

In such a plate heat exchanger, each of the plurality of heat transfer plates has a contour including at least two pairs of edges parallel to or substantially parallel to each other when viewed from the first direction.

With this in mind, each of the plurality of heat transfer plates has a heat transfer portion having indentations and ridges extending in a direction intersecting each of the two pairs of edge edges, and each of the two pairs of heat transfer plates. A pair of first extension portions including edge edges forming a pair, each extending from the outer edge of the heat transfer portion in a second direction orthogonal to the first direction, and a pair of first extension portions, respectively. Is a pair of second extending portions including the edge forming the other pair of the two pairs, each extending from the outer edge of the heat transfer portion in the direction intersecting the first direction and the second direction. It is provided with a pair of second extension portions.

Each of the pair of first extending portions has a base end and a tip in the second direction, and the base end is connected to an intermediate position in the first direction of the outer edge of the heat transfer part. And a first bent portion extending from the tip of the first middle stage portion to the first surface side and having the tip serving as an edge forming one pair of the two pairs.

Each of the pair of second extension portions has a proximal end and a tip in a direction orthogonal to the first direction and the second direction, and the proximal end is connected to an intermediate position in the first direction of the outer edge of the heat transfer portion. It is provided with a flat plate-shaped second middle stage portion and a second bent portion extending from the tip end of the second middle stage portion toward the second surface side and having the tip end forming one pair of the two pairs. ..

The tip of the first bent portion extends straight in a direction orthogonal to the extending direction of the first bent portion, and is on the bending side of the first bent portion in the first direction (first surface). At the same level as or approximately the same level as the top of the ridge. On the other hand, the tip of the second bent portion extends straight in a direction orthogonal to the extending direction of the second bent portion, and is on the bending side of the second bent portion in the second direction. At the same or substantially the same level as the top of the ridge (on the second side).

As a result, in a state where a plurality of heat transfer plates are overlapped with each other, the protrusions on the first surface of the heat transfer part of the adjacent heat transfer plates intersect with each other and the first fold. The tips of the curved parts overlap each other, and the protrusions on the second side of the heat transfer parts of the adjacent heat transfer plates with the second surfaces facing each other intersect and collide with each other, and the tips of the second bent parts overlap each other. .. Along with this, the tips of the two overlapping first bent portions are liquid-tightly connected to each other, and the tips of the two overlapping second bent portions are liquid-tightly connected to each other.

By liquidally connecting the tips of the two first bent portions to each other in this way, a flow path is formed between the first surfaces of the adjacent heat transfer plates, and the two second bent portions are formed. By connecting the tips of the heat transfer plates in a liquid-tight manner, a flow path is formed between the second surfaces of adjacent heat transfer plates.

By the way, in the heat transfer plate of the plate heat exchanger having the above configuration, as described above, the base ends of the first middle stage portion of the first extension portion and the second middle stage portion of the second extension portion are transferred. It is connected to the middle position in the first direction of the outer edge of the heat part.

Therefore, in a state where the heat transfer plates are overlapped with each other, the first middle stage portions of the adjacent heat transfer plates are arranged with the first surfaces facing each other at intervals, and the second surfaces face each other and are adjacent to each other. The second middle portions of the heat plates are arranged at intervals. That is, the first middle stage of the two adjacent heat transfer plates forms a tunnel penetrating in the fluid flow direction, and the second middle stage of the two adjacent heat transfer plates forms a tunnel penetrating in the fluid flow direction. do.

Therefore, in each of the flow path formed between the first surfaces and the flow path formed between the second surfaces, there are heat transfer portions (concave and convex stripes) having high heat exchange efficiency in the flowing fluid. There are some that pass through the tunnel (short pass) without passing through the area). In particular, since the recesses and ridges of the heat transfer portion extend in a direction intersecting the two pairs of edge edges, the fluid reaches the boundary between the heat transfer portion and the first extension portion from the inlet side of the flow path. The probability of flowing into the tunnel from the recess or the recess that reaches the boundary between the heat transfer portion and the second extension portion from the inlet side of the flow path increases, and the heat exchange efficiency deteriorates.

Japanese Patent No. 4065435

The present invention provides a plate-type heat exchanger capable of suppressing a decrease in heat exchange efficiency even when a flow path is formed by liquid-tightly joining the linear edges of adjacent heat transfer plates. That is the issue.

The plate-type heat transfer device according to the present invention is a plurality of heat transfer plates each having a contour including at least two pairs of a pair of edge edges parallel to or substantially parallel to each other when viewed from the first direction. A plurality of heat transfer plates having a first surface and a second surface facing away from the first surface in the direction and superposed in the first direction so as to have the same or substantially constant contours. Each of the heat transfer plates has a plurality of indentations and ridges extending in a direction intersecting each of the two pairs of edge edges on the first surface, and the indentations on the first surface on the second surface. A pair of heat transfer portions in which a ridge having a front-back relationship and a ridge having a front-back relationship with the ridge on the first surface are formed, and an edge each of which constitutes one of the two pairs. A pair of first extension parts, each of which extends from the outer edge of the heat transfer part in a second direction orthogonal to the first direction, and a pair of the other of the two pairs. A pair of second extension portions including a constituent edge, each of which includes a pair of second extension portions extending from the outer edge of the heat transfer portion in a direction intersecting the first direction and the second direction. , Each of the pair of first extension portions is a first middle stage portion having a base end and a tip in the second direction, and the top of the ridge on the first surface and the convex on the second surface in the first direction. It is the first middle part whose base end is connected to the outer edge of the heat transfer part and the first bent part having the base end and the tip so as to follow the first virtual plane passing between the tops of the strips. The first bent portion whose base end is connected to the tip of the first middle stage portion and extends to the first surface side of the heat transfer portion and whose tip is the edge forming one pair of the two pairs. Each of the pair of second extension portions is a second middle stage portion having a base end and a tip in a direction intersecting the first direction and the second direction, and is a convex portion of the first surface in the first direction. along the second imaginary plane passing between the top portion and the top ridge of the second surface of the strip, and a second middle portion having a base end to the outer edge of the heat transfer section is connected, proximal and distal ends A second bent portion having a Each of the plurality of heat transfer plates is provided with a second bent portion as an edge, and the first surface of the heat transfer portion of the heat transfer plate is adjacent to the first surface of the heat transfer portion on one side in the first direction. The first flow path that allows the first fluid to flow between the first surfaces of the adjacent heat transfer portions by connecting the tips of the first bent portions in the opposite first extending portions in a state of facing each other. And make the second surface of the heat transfer part face the second surface of the heat transfer part of the adjacent heat transfer plates on the other side of the first direction. In this state, the tips of the second bent portions in the opposite second extending portions are connected to each other to form a second flow path through which the second fluid flows between the second surfaces of the adjacent heat transfer portions. However, in each of the plurality of heat transfer plates, the first extension portion reached by the recess starting from at least the upstream side of the first flow path of the pair of first extension portions is from the first middle stage portion to the first extension portion. At least one first convex portion projecting in one direction, comprising at least one first convex portion projecting toward the heat transfer plate of the other party facing the first surface, and a pair of second extending portions. The second extending portion reached by the recess starting from at least the upstream side of the second flow path is at least one second convex portion protruding in the first direction from the second middle stage portion, and the second Each of the plurality of heat transfer plates comprises at least one second convex portion protruding toward the heat transfer plate of the other party whose surfaces face each other, and in each of the plurality of heat transfer plates, the first convex portion of each of the pair of first extension portions is the first. A pair of second extension portions that are arranged at a position facing the first convex portion of the heat transfer plate of the other party with one surface facing each other and formed lower than the top of the convex strip on the first surface in the first direction. Each of the second convex portions of the above is arranged at a position facing the second convex portion of the heat transfer plate of the other party facing the second surface, and is lower than the top of the convex portion of the second surface in the first direction. is formed, characterized in Rukoto.

As one aspect of the present invention, in each of the plurality of heat transfer plates, each of the pair of first extending portions includes at least one said first convex portion, and each of the pair of second extending portions has the said. At least one second convex portion may be provided.

According to the present invention, even if a flow path is formed by liquid-tightly joining the linear edges of adjacent heat transfer plates, a decrease in heat exchange efficiency can be suppressed, which is an excellent effect. obtain.

FIG. 1 is an overall perspective view of a plate heat exchanger according to an embodiment of the present invention. FIG. 2 is a perspective view including a cross section of FIG. 1 II-II. FIG. 3 is a perspective view including a cross section III-III of FIG. FIG. 4 is an exploded perspective view of the plate heat exchanger according to the embodiment. FIG. 5 is a view of the heat transfer plate according to the embodiment as viewed from the front surface side. FIG. 6 is a view of the heat transfer plate according to the same embodiment as viewed from the second surface side. FIG. 7 is a cross-sectional view in which a part of the heat transfer plate according to the same embodiment is omitted, and is a cross-sectional view of VII-VII of FIG. FIG. 8 is a cross-sectional view in which a part of the heat transfer plate according to the same embodiment is omitted, and is a cross-sectional view of VIII-VIII of FIG. FIG. 9 is a partially enlarged cross-sectional view in which a part of the heat transfer plate laminated body according to the same embodiment is omitted, and is a partially enlarged cross-sectional view seen from the Y-axis direction. FIG. 10 is a partially enlarged cross-sectional view in which a part of the heat transfer plate laminated body according to the same embodiment is omitted, and is a partially enlarged cross-sectional view seen from the X-axis direction. FIG. 11 is a diagram for explaining the flow of fluid in the first flow path in the other block of the heat transfer plate laminate according to the same embodiment. FIG. 12 is a diagram for explaining the flow of fluid in the first flow path in one block of the heat transfer plate laminated body according to the same embodiment. FIG. 13 is a diagram for explaining the flow of fluid in the second flow path in one block of the heat transfer plate laminated body according to the same embodiment. FIG. 14 is a diagram for explaining the flow of fluid in the second flow path in the other block of the heat transfer plate laminate according to the same embodiment. FIG. 15 is an enlarged view of the XV portion of FIG. FIG. 16 is an enlarged view of the XVI portion of FIG.

Hereinafter, the plate heat exchanger according to the embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 to 4, the plate heat exchanger 1 supplies a heat exchange unit 2 that exchanges heat between the first fluid A and the second fluid B, and a first fluid A that supplies the heat exchange unit 2. One liquid supply port 3, a first liquid supply port 4 for discharging the first fluid A from the heat exchange unit 2, a second liquid supply port 5 for supplying the second fluid B to the heat exchange unit 2, and heat exchange. A second drain port 6 for discharging the second fluid B from the part 2 is provided.

In the present embodiment, the heat exchange unit 2 includes a plurality of heat transfer plates 20 stacked in the first direction as shown in FIGS. 2 to 4. Further, the heat exchange unit 2 is an exterior body 21 that surrounds the plurality of heat transfer plates 20 that are overlapped with each other, and is a first liquid supply port 3, a first liquid supply port 4, a second liquid supply port 5, and a second drainage port. The exterior body 21 to which the liquid port 6 is attached is provided. In the present embodiment, the heat exchange unit 2 is the first partition plate 22 arranged corresponding to the heat transfer plate 20 at the intermediate position in the first direction among the plurality of superposed heat transfer plates 20. , At an intermediate position in the first direction among the plurality of heat transfer plates 20 overlapped with the first partition plate 22 that changes the flow direction of the flow path from the first liquid supply port 3 to the first drainage port 4. A second partition plate 23 arranged corresponding to a certain heat transfer plate 20, and a second partition plate 23 that changes the flow direction of the flow path from the second liquid supply port 5 to the second drainage port 6. To be equipped.

In the following description, the first direction is the Z-axis direction, the second direction orthogonal to the first direction is the X-axis direction, and the third direction orthogonal to each of the first direction and the second direction is the Y-axis direction. And. Along with this, for each drawing, there are three orthogonal axes (Z axis, X axis, Y axis) or two orthogonal axes (Z axis, X axis, Y axis) corresponding to the Z axis direction, the X axis direction, and the Y axis direction. Two of them) are shown as an auxiliary figure.

As shown in FIGS. 5 and 6, each of the plurality of heat transfer plates 20 ... Has a first surface S1 in the Z-axis direction and a second surface S2 facing away from the first surface S1. Each of the plurality of heat transfer plates 20 ... Has a contour Ea including at least two pairs of edge edges Ea1, Ea1, Ea2, and Ea2 that are parallel or substantially parallel to each other when viewed from the Z-axis direction.

In the present embodiment, the paired edge edges Ea1, Ea1, Ea2, and Ea2 extend in the same direction. Further, the paired edge edges Ea1, Ea1, Ea2, and Ea2 extend in different directions with respect to the different paired edge edges Ea1, Ea1, Ea2, and Ea2, and become different paired edge edges Ea1, Ea1, Ea2, and Ea2. It is connected. Along with this, the heat transfer plate 20 has four or more corners formed by connecting different pairs of edge edges Ea1 and Ea2.

More specifically, in the present embodiment, the heat transfer plate 20 has a quadrangular shape when viewed from the Z-axis direction. More precisely, the heat transfer plate 20 has a square shape when viewed from the Z-axis direction. Along with this, the contour Ea of the heat transfer plate 20 viewed from the Z-axis direction includes two pairs of edge edges Ea1, Ea1, Ea2, and Ea2 that are parallel or substantially parallel to each other.

That is, the contour Ea of the heat transfer plate 20 is spaced in the Y-axis direction from a pair of edge edges (hereinafter referred to as first one end edges) Ea1 and Ea1 extending in the X-axis direction and extending in the Y-axis direction. Each includes a pair of edge edges (hereinafter referred to as second edge edges) Ea2 and Ea2 extending in the X-axis direction. In the present embodiment, each of the first end edge Ea1, Ea1 and the second end edge Ea2, Ea2 is linear. Along with this, the heat transfer plate 20 has four corners.

In the heat transfer plate 20, a plurality of recesses 200a and ridges 200b extending in a direction intersecting each of the first end edge Ea1 and the second end edge Ea2 are formed on the first surface S1, and the second surface is formed. A heat transfer portion 200 in which a ridge 200b having a front-back relationship with the dent 200a on the first surface S1 and a ridge 200a having a front-back relationship with the ridge 200b on the first surface S1 is formed on S2, respectively. A pair of first extending portions 201, 201 including a first end edge Ea1 constituting one of the pairs, each extending in the X-axis direction from the outer edge Eb1 of the heat transfer portion 200. A pair of second extension portions 202, 202 including a first extension portion 201, 201 and a second edge Ea2, each of which constitutes the other pair of the two pairs, each of which is a heat transfer portion 200. It is provided with a pair of second extending portions 202, 202 extending in the Y-axis direction from the outer edge Eb2 of the above.

The contour Eb of the heat transfer portion 200 seen from the Z-axis direction is similar to the contour Ea of the heat transfer plate 20 seen from the Z-axis direction. In the present embodiment, since the heat transfer plate 20 is square when viewed from the Z-axis direction, the heat transfer portion 200 is also square when viewed from the Z-axis direction.

Therefore, the contour Eb of the heat transfer unit 200 includes two pairs of outer edges Eb1 and Eb2 that are parallel or substantially parallel to each other. In the present embodiment, the outer edges Eb1 and Eb2 included in the contour Eb of the heat transfer portion 200 are the edge Ea1 and Ea2 (first end edge Ea1 or second edge Ea2) included in the contour Ea of the heat transfer plate 20. Parallel or substantially parallel.

That is, the contours Eb of the heat transfer unit 200 are spaced apart in the X-axis direction and each extend in the Y-axis direction with a pair of outer edges (hereinafter referred to as the first outer edge) Eb1 and separated in the Y-axis direction. Includes a pair of outer edges (hereinafter referred to as second outer edges) Eb2 extending in the X-axis direction. As described above, in the present embodiment, since each of the first end edge Ea1 and the second end edge Ea2 is linear, each of the first outer edge Eb1 and the second outer edge Eb2 is also linear.

As shown in FIG. 5, the recesses 200a and the ridges 200b on the first surface S1 of the heat transfer portion 200 extend in the synthesis direction including the components in the X-axis direction and the components in the Y-axis direction. As described above, the first surface S1 of the heat transfer portion 200 has a plurality of recesses 200a and ridges 200b, and the plurality of dents 200a and ridges 200b have a component in the X-axis direction and a component in the Y-axis direction. They are arranged in a direction orthogonal to the synthesis direction including and. That is, the recesses 200a and the ridges 200b of the first surface S1 of the heat transfer portion 200 are alternately arranged in a direction orthogonal to the synthesis direction including the component in the X-axis direction and the component in the Y-axis direction.

As described above, the recess 200a on the second surface S2 of the heat transfer portion 200 has a front-back relationship with the ridge 200b on the first surface S1, and the ridge 200b on the second surface S2 of the heat transfer portion 200 has a front-back relationship. , There is a front-back relationship with the recess 200a on the first surface S1.

Along with this, as shown in FIG. 6, the recesses 200a and the ridges 200b on the second surface S2 of the heat transfer portion 200 extend in the synthesis direction including the components in the X-axis direction and the components in the Y-axis direction. Further, as described above, the second surface S2 of the heat transfer portion 200 has a plurality of recesses 200a and ridges 200b, and the plurality of dents 200a and ridges 200b have components in the X-axis direction and the ridges 200b in the Y-axis direction. They are arranged in a direction orthogonal to the synthesis direction including the components of. That is, the recesses 200a and the ridges 200b of the second surface S2 of the heat transfer portion 200 are alternately arranged in a direction orthogonal to the synthesis direction including the component in the X-axis direction and the component in the Y-axis direction.

As shown in FIGS. 5, 6 and 7, each of the pair of first extending portions 201 and 201 is a first middle stage portion 201a having a base end and a tip in the X-axis direction, and is in the Z-axis direction. The first middle stage portion 201a whose base end is connected to the heat transfer portion 200 at a position between the top of the ridge 200b of the first surface S1 and the top of the ridge 200b of the second surface S2, and the X-axis. A first bent portion 201b having a base end and a tip in a direction intersecting the direction, the base end is connected to the tip of the first middle stage portion 201a, and extends to the first surface S1 side of the heat transfer portion 200. It also includes a first bent portion 201b whose tip is the edge Ea1 forming one pair of the two pairs of edge Ea1 and Ea2.

The base end of the first middle stage portion 201a of the first extension portion 201 of one of the pair of first extension portions 201, 201 is attached to the first outer edge Eb1 of one of the pair of first outer edges Eb1 and Eb1. The base end of the first middle stage portion 201a of the first extending portion 201 of the pair of first extending portions 201 and 201 is connected to the first of the other of the pair of first outer edges Eb1 and Eb1. It is connected to the outer edge Eb1.

Each of the first middle stage portions 201a of the pair of first extending portions 201 and 201 is a strip-shaped portion having a longitudinal direction (Y-axis direction) of the first end edge Ea1 and Ea1. It has a base end and a tip end in a direction orthogonal to each other (short direction).

As shown in FIG. 7, the first middle stage portion 201a passes through an intermediate position in the Z-axis direction between the top of the ridge 200b of the first surface S1 and the top of the ridge 200b of the second surface S2. The base end of the first middle stage portion 201a is connected to the first outer edge Eb1 along the virtual plane BL. In the present embodiment, the first virtual plane BL is set as a reference plane that is a boundary between the concave groove 200a and the convex groove 200b of the first surface S1.

More specifically, the recess 200a of the first surface S1 of the heat transfer portion 200 is recessed in the Z-axis direction from the reference surface BL extending in the X-axis direction and the Y-axis direction, and the first surface S1 of the heat transfer portion 200 is recessed. The ridges 200b of the above project from the reference surface BL in the Z-axis direction. Along with this, the ridges 200b of the second surface S2, which have a front-back relationship with the dents 200a of the first surface S1, project from the reference surface BL in the Z-axis direction, and the ridges 200b of the first surface S1 have a front-back relationship. The recess 200a of the second surface S2 in the above is recessed in the Z-axis direction from the reference surface BL. On the premise of this, in the present embodiment, the reference plane that is the boundary between the concave line 200a and the convex line 200b of the first surface S1 is defined as the first virtual plane BL. Therefore, in the present embodiment, the first middle stage portion 201a of the first extending portion 201 is formed by the recess 200a (convex 200b) on the first surface S1 and the recess 200a (convex 200b) on the second surface S2. It extends from the first outer edge Eb1 of the heat transfer portion 200 so as to follow (pass) the reference plane BL which is the boundary.

In each of the pair of first extending portions 201 and 201, the first bent portion 201b is a strip-shaped portion having a longitudinal direction (Y-axis direction) of the first end edge Ea1 and is a strip-shaped portion having a longitudinal direction. It has a base end and a tip end in a direction orthogonal to each other (short direction). The base end of the first bent portion 201b is connected over the entire length of the tip of the corresponding first middle stage portion 201a.

The first bent portion 201b is bent toward the first surface S1 side of the heat transfer portion 200 with its base end (tip of the first middle stage portion 201a) as a fulcrum. In the present embodiment, the first bent portion 201b is inclined with respect to the connected first middle stage portion 201a.

Specifically, the first bent portion 201b is inclined so that the tip end is located outside the base end in the X-axis direction. The tip Ea1 of the first bent portion 201b is located at the same level as the top of the ridge 200b of the first surface S1 of the heat transfer portion 200 in the Z-axis direction. In the present embodiment, the predetermined range including the tip Ea1 of the first bent portion 201b is X with the virtual line extending in the Y-axis direction as the center of curvature as the connection allowance (welding allowance) with the heat transfer plates 20 to be overlapped. It is curved outward in the axial direction.

As shown in FIGS. 5 and 7, in the present embodiment, the first extension reached by the recess 200a starting from the upstream side of at least the first flow path Ra of the pair of first extension portions 201,201. The portion 201 includes at least one first convex portion 203 protruding from the first middle stage portion 201a in the Z-axis direction.

Specifically, as described above, the plurality of recesses 200a and ridges 200b on the first surface S1 of the heat transfer unit 200 extend in the synthesis direction including the components in the X-axis direction and the components in the Y-axis direction. Moreover, they are arranged in a direction orthogonal to the synthesis direction including the component in the X-axis direction and the component in the Y-axis direction. Therefore, in the plurality of recesses 200a and ridges 200b, the second outer edge Eb2 of one of the pair of second outer edges Eb2 and Eb2 is set as a starting point, and the pair of first outer edges Eb1 and Eb1 There are recesses 200a and ridges 200b ending at one of the first outer edges Eb1. Therefore, the recess 200a having one end of the first outer edge Eb1 is opened in the X-axis direction at the boundary between the heat transfer portion 200 and the first middle stage portion 201a.

Along with this, the first extending portion 201 reached by the recess 200a starting from one of the second outer edges Eb2 is a first extending portion 201 that partially bulges the first middle stage portion 201a and projects toward the first surface S1 side. The one convex portion 203 is provided.

In the present embodiment, as shown in FIG. 7, each of the pair of first extending portions 201 and 201 includes a first convex portion 203 in which the first middle stage portion 201a is bulged toward the first surface S1.

In the present embodiment, the first convex portion 203 is arranged at one position at a substantially central position in the longitudinal direction of the first middle stage portion 201a. The first convex portion 203 is formed over the entire width of the first middle stage portion 201a in the X-axis direction. That is, the first convex portion 203 exists in substantially the entire range between the first outer edge Eb1 of the heat transfer portion 200 and the first bent portion 201b.

In the present embodiment, the top of the first convex portion 203 is set at a position lower than the top of the convex strip 200b on the first surface S1 of the heat transfer portion 200 in the Z-axis direction. That is, the amount of protrusion of the first convex portion 203 from the reference surface BL is smaller than the amount of protrusion of the convex strip 200b of the first surface S1 from the reference surface BL.

As shown in FIGS. 5, 6 and 8, each of the pair of second extension portions 202 and 202 is a second middle stage portion 202a having a base end and a tip in the Y-axis direction, and is in the Z-axis direction. The second middle stage portion 202a whose base end is connected to the heat transfer portion 200 at a position between the top of the ridge 200b of the first surface S1 and the top of the ridge 200b of the second surface S2, and the Y axis. A second bent portion 202b having a base end and a tip in a direction intersecting the direction, the base end is connected to the tip of the second middle stage portion 202a, and extends to the second surface S2 side of the heat transfer portion 200. It also includes a second bent portion 202b whose tip is the edge Ea2 forming one pair of the two pairs of edge edges Ea1 and Ea2.

The base end of the second middle stage portion 202a of the second extension portion 202 of one of the pair of second extension portions 202, 202 is attached to the second outer edge Eb2 of one of the pair of second outer edges Eb2 and Eb2. The base end of the second middle stage portion 202a of the second extension portion 202, which is connected and is the other of the pair of second extension portions 202, 202, is the second of the other second of the pair of second outer edges Eb2, Eb2. It is connected to the outer edge Eb2.

Each of the second middle stage portions 202a of the pair of second extension portions 202 and 202 is a strip-shaped portion having a longitudinal direction (X-axis direction) of the second end edge Ea2 and is orthogonal to the longitudinal direction. In the direction (short direction), it has a base end and a tip end.

As shown in FIG. 8, the second middle stage portion 202a passes through an intermediate position in the Z-axis direction between the top of the ridge 200b of the first surface S1 and the top of the ridge 200b of the second surface S2. The base end of the second middle stage portion 202a is connected to the second outer edge Eb2 along the virtual plane BL. In the present embodiment, the second virtual plane BL is a virtual plane common to the first virtual plane BL. That is, the second virtual plane BL is set as a reference plane that is a boundary between the concave line 200a and the convex line 200b of the first surface S1.

Therefore, the second middle portion 202a of the second extending portion 202 in the present embodiment is a boundary between the concave groove 200a (convex 200b) on the first surface S1 and the concave groove 200a (convex 200b) on the second surface S2. It extends from the second outer edge Eb2 of the heat transfer portion 200 so as to follow (pass) the reference plane BL.

In each of the pair of second extending portions 202 and 202, the second bent portion 202b is a strip-shaped portion having a longitudinal direction (X-axis direction) of the second end edge Ea2, and is a strip-shaped portion having a longitudinal direction. It has a base end and a tip end in a direction orthogonal to each other (short direction). The base end of the second bent portion 202b is connected over the entire length of the tip of the corresponding second middle stage portion 202a.

The second bent portion 202b is bent toward the second surface S2 side of the heat transfer portion 200 with its base end (tip of the second middle stage portion 202a) as a fulcrum. In the present embodiment, the second bent portion 202b is inclined with respect to the connected second middle stage portion 202a.

Specifically, the second bent portion 202b is inclined so that the tip end is located outside the base end in the Y-axis direction. The tip Ea2 of the second bent portion 202b is located at the same level as the top of the ridge 200b of the second surface S2 of the heat transfer portion 200 in the Z-axis direction. In the present embodiment, the predetermined range including the tip Ea2 of the second bent portion 202b is Y as the connection allowance (welding allowance) with the heat transfer plates 20 to be overlapped with the virtual line extending in the X-axis direction as the center of curvature. It is curved outward in the axial direction.

As shown in FIGS. 6 and 8, the second extending portion 202 reached by the recess 200a starting from the upstream side of at least the second flow path Rb of the pair of second extending portions 202 and 202 At least one second convex portion 204 protruding from the second middle stage portion 202a in the Z-axis direction is provided.

Specifically, as described above, the plurality of recesses 200a and ridges 200b on the second surface S2 of the heat transfer unit 200 extend in the synthesis direction including the component in the X-axis direction and the component in the Y-axis direction. Moreover, they are arranged in a direction orthogonal to the synthesis direction including the component in the X-axis direction and the component in the Y-axis direction. Therefore, in the plurality of recesses 200a and ridges 200b, the first outer edge Eb1 of one of the pair of first outer edges Eb1 and Eb1 is set as a starting point, and among the pair of second outer edges Eb2 and Eb2. There are recesses 200a and ridges 200b having one second outer edge Eb2 as an end point. Therefore, the recess 200a having one second outer edge Eb2 as an end point is opened in the Y-axis direction at the boundary between the heat transfer portion 200 and the second middle stage portion 202a. Along with this, the second extending portion 202 reached by the recess 200a starting from one of the first outer edges Eb1 is a second extending portion 202 that partially bulges the second middle stage portion 202a and projects toward the second surface S2 side. The biconvex portion 204 is provided.

In the present embodiment, as shown in FIG. 8, each of the pair of second extending portions 202 and 202 includes a second convex portion 204 in which the second middle stage portion 202a is bulged toward the second surface S2.

In the present embodiment, the second convex portion 204 is arranged at one position at a substantially central position in the longitudinal direction of the second extending portion 202. The second convex portion 204 is formed over the entire width of the second middle stage portion 202a in the Y-axis direction. That is, the second convex portion 204 exists in substantially the entire range between the second outer edge Eb2 of the heat transfer portion 200 and the second bent portion 202b.

In the present embodiment, the top of the second convex portion 204 is set at a position lower than the top of the convex strip 200b on the second surface S2 of the heat transfer portion 200 in the Z-axis direction. That is, the amount of protrusion of the second convex portion 204 from the reference surface BL is smaller than the amount of protrusion of the convex strip 200b of the second surface S2 from the reference surface BL.

The plurality of heat transfer plates 20 are superposed in the Z-axis direction so that the contours Ea are aligned or substantially constant. Specifically, as shown in FIGS. 9 and 10, each of the plurality of heat transfer plates 20 has the first surface S1 of its own heat transfer portion 200 adjacent to each other on one side in the Z-axis direction. The first surface S1 of the heat transfer unit 200 is opposed to each other, and the second surface S2 of its own heat transfer unit 200 is adjacent to the second surface S2 of its own heat transfer unit 200 on the other side in the Z-axis direction. Make them face each other.

As shown in FIGS. 11 and 12, the two heat transfer plates 20 having the first surfaces S1 of the heat transfer portions 200 facing each other intersect each other with the protrusions 200b of the first surfaces S1 of the heat transfer portions 200. The other heat transfer plate 20 is arranged so as to be rotated by 180 ° about a virtual line extending in the Z-axis direction with respect to one heat transfer plate 20.

Further, as shown in FIGS. 13 and 14, the two heat transfer plates 20 having the second surfaces S2 of the heat transfer portions 200 facing each other intersect the ridges 200b of the first surfaces S1 of the heat transfer portions 200 with each other. The other heat transfer plate 20 is arranged so as to abut against one heat transfer plate 20 by rotating it by 180 ° about a virtual line extending in the Z-axis direction.

In this state, as shown in FIGS. 9 and 10, the tips (first end edge Ea1) of the first bent portion 201b of the heat transfer plate 20 in which the first surfaces S1 of the heat transfer portion 200 face each other are connected to each other. The tips (second end edge Ea2) of the second bent portion 202b of the heat transfer plate 20 in which the second surfaces S2 of the heat transfer portion 200 face each other are in a linearly abutted state. It becomes a state. Along with this, the tips (first end edge Ea1) of the first bent portion 201b in the butt state are connected to each other by welding, and the tips (second end edge Ea2) of the second bent portion 202b in the butt state are connected by welding. ) Are connected by welding.

That is, the first welded portion 205 in which the portions including the tip (first end edge Ea1) of the first bent portion 201b are melted is formed so as to extend in the Y-axis direction, and the tip of the second bent portion 202b (the first). The second welded portion 206, in which the portions including the two-end edges Ea2) are fused together, is formed so as to extend in the X-axis direction.

As a result, between the heat transfer plates 20 in which the first surfaces S1 of the heat transfer unit 200 face each other, the space between the second end edges Ea2 of any one is set as the first inflow port Ra1 and the second of the other. A first flow path Ra having an edge Ea2 as a first outlet Ra2 is formed extending in the Y-axis direction (see FIG. 10), and is formed between the heat transfer plates 20 having the second surfaces S2 of the heat transfer portion 200 facing each other. Is a second flow path Rb in which one of the first end edge Ea1 is the second inflow port Rb1 and the other one of the first end edge Ea1 is the second outflow port Rb2 in the X-axis direction. It is elongated and formed (see FIG. 9).

In the present embodiment, as shown in FIG. 15, the first welded portion 205 is exposed in the first flow path Ra, and as shown in FIG. 16, the second welded portion 206 is exposed in the second flow path Rb. There is.

Specifically, as shown in FIG. 15, the first bent portion 201b is inclined so as to be located outward in the X-axis direction toward the tip Ea1 side with respect to the connected first middle stage portion 201a. Therefore, the inner surface of the first bent portion 201b of the heat transfer plate 20 in which the first surfaces S1 of the heat transfer portion 200 face each other forms a space that expands toward the inside of the first flow path Ra.

The first welded portion 205 exposed in the first flow path Ra has an intersection P1 of two virtual lines (hereinafter referred to as the first virtual line) VL1 with respect to the inner surfaces of the two connected first bent portions 201b. Formed to include. In the present embodiment, since the predetermined range including the tip Ea1 of the first bent portion 201b is curved outward, each of the two first virtual lines VL1 is curved in the first bent portion 201b. A tangent to the inner surface (a line that shares a point with the curved inner surface (first surface S1)). The two first virtual lines VL1 have a symmetrical relationship with each other with respect to a virtual line (not shown) extending in the X-axis direction through the abutting position of the tip Ea1 before welding.

In the present embodiment, the first welded portion 205 is exposed to the first flow path Ra and bulges toward the inside of the first flow path Ra. That is, both edges of the first welded portion 205 in the Z-axis direction are on the first flow path Ra side in the X-axis direction with respect to the intersection P1 of the first virtual line VL1.

As shown in FIG. 16, the second bent portion 202b is inclined so as to be located on the outer side in the Y-axis direction toward the tip end side with respect to the connected second middle stage portion 202a. Therefore, the inner surface of the second bent portion 202b of the heat transfer plate 20 in which the second surfaces S2 of the heat transfer portion 200 face each other forms a space that expands toward the inside of the second flow path Rb.

Along with this, the second welded portion 206 exposed in the second flow path Rb has two virtual lines to the inner surfaces of the two connected second bent portions 202b (hereinafter referred to as the second virtual line). It is formed so as to include the intersection P2 of VL2. In the present embodiment, since the predetermined range including the tip Ea2 of the second bent portion 202b is curved outward, each of the two second virtual lines VL2 is curved in the second bent portion 202b. A tangent to the inner surface (a line that shares a point with the curved inner surface (second surface S2)). The two second virtual lines VL2 have a symmetrical relationship with each other with respect to a virtual line (not shown) extending in the Y-axis direction through the abutting position of the tip Ea2 before welding.

In the present embodiment, the second welded portion 206 is exposed to the second flow path Rb and bulges toward the inside of the second flow path Rb. That is, both edges of the second welded portion 206 in the X-axis direction are on the second flow path Rb side in the X-axis direction with respect to the intersection P2 of the second virtual line VL2.

In this way, the plurality of heat transfer plates 20 are superposed in the Z-axis direction, the first end edges Ea1 and Ea1 of the adjacent heat transfer plates 20 are connected to each other, and the second end edges of the adjacent heat transfer plates 20 are connected to each other. By connecting Ea2 and Ea2 to each other, the plurality of heat transfer plates 20 are integrated as shown in FIGS. 2 to 4, 9 and 10, and form a heat transfer plate laminated body LB.

As described above, the plurality of heat transfer plates 20 are superposed in a state where the contours Ea are matched. Along with this, in the heat transfer plate laminated body LB, as shown in FIGS. 9 and 10, the first welded portions 205 connecting one first end edge Ea1 of each heat transfer plate 20 are arranged in the Z-axis direction. A second surface Sb in which one surface Sa and a first welded portion 205 connecting the other first end edge Ea1 of each heat transfer plate 20 are arranged in the Z-axis direction, and one second end of each heat transfer plate 20. The third surface Sc in which the second welded portions 206 connecting the edges Ea2 are arranged in the Z-axis direction and the second welded portions 206 in which the other second end edges Ea2 of each heat transfer plate 20 are connected to each other are arranged in the Z-axis direction. The fourth surface Sd is included in the surroundings.

As shown in FIG. 9, the first surface Sa of the heat transfer plate laminated body LB has a plurality of first welded portions 205 each extending in a direction orthogonal to the Z-axis direction and spaced apart in the Z-axis direction, and a Z-axis. It includes at least one of a plurality of second inflow ports Rb1 and second outflow ports Rb2 defined by the first welded portions 205 adjacent to each other in the direction and each of which is connected to the corresponding second flow path Rb.

The second surface Sb of the heat transfer plate laminated body LB is a first welded portion 205 adjacent to each other in the Z-axis direction and extending in a direction orthogonal to the Z-axis direction and spaced apart in the Z-axis direction. It includes at least one of a plurality of second inlets Rb1 and second outlets Rb2 defined by the welds 205 and each connected to the corresponding second flow path Rb.

As shown in FIG. 10, the third surface Sc of the heat transfer plate laminated body LB has a plurality of second welded portions 206 each extending in a direction orthogonal to the Z-axis direction and spaced apart in the Z-axis direction, and a Z-axis. It includes at least one of a plurality of first inflow ports Ra1 and a plurality of first outflow ports Ra2 defined by the second welded portions 206 adjacent to each other in the direction and each of which is connected to the corresponding first flow path Ra.

The fourth surface Sd of the heat transfer plate laminated body LB is a second welded portion 206 that extends in a direction orthogonal to the Z-axis direction and is spaced apart in the Z-axis direction, and is adjacent to each other in the Z-axis direction. Includes at least one of a plurality of first inlets Ra1 and a plurality of first outlets Ra2 defined by the welds 206 and each connected to the corresponding first flow path Ra.

Returning to FIG. 4, the exterior body 21 includes a plurality of exterior plates 210, 211,212, 213,214,215 arranged around the plurality of heat transfer plates 20 (heat transfer plate laminated body LB), and a plurality of exteriors. It is provided with a support frame 216 that supports the plates 210, 211,212,213,214,215 in a fixed position with respect to a plurality of heat transfer plates 20 (heat transfer plate laminated body LB).

The outer plates 210, 211,212,213,214,215 are arranged around a plurality of heat transfer plates 20 with respect to the center line extending in the Z-axis direction. Includes 214,215 arranged on both sides of the plurality of heat transfer plates 20 in the axial direction.

The exterior plates 210, 211,212, 213, 214, 215 arranged around the plurality of superposed heat transfer plates 20 depend on the number of edge edges Ea1 and Ea2 included in the contour Ea of the heat transfer plates 20. It will be provided. That is, the exterior plates 210, 211,212,213,214,215 arranged around the plurality of heat transfer plates 20 have the number of surfaces Sa, Sb, Sc, and Sd formed around the heat transfer plate laminated body LB. Provided accordingly.

In the present embodiment, the heat transfer plate 20 has a quadrangular shape (square shape) when viewed from the Z-axis direction, and has four end edges (a pair of first end edges Ea1, Ea1 and a pair of second ends) on the contour Ea. Edges Ea2, Ea2) are included. Along with this, four exterior plates 210, 211,212, 213,214,215 are arranged around the heat transfer plate laminated body LB.

Specifically, the plate-type heat exchanger 1 (heat exchange unit 2) according to the present embodiment has the outer plates 210, 211,212, 213, 214, 215 as the first surface Sa of the heat transfer plate laminated body LB. The first exterior plate 210 facing the entire surface of the heat transfer plate laminate LB, the second exterior plate 211 facing the entire surface of the second surface Sb of the heat transfer plate laminate LB, and the entire surface of the third surface Sc of the heat transfer plate laminate LB. The third exterior plate 212 and the fourth exterior plate 213 facing the entire surface of the fourth surface Sd of the heat transfer plate laminated body LB are provided.

In the present embodiment, the second liquid supply port 5 and the second liquid drainage port 6 are attached to the first exterior plate 210. Specifically, the first exterior plate 210 is two through holes (not shown) penetrating in a direction orthogonal to the Z-axis direction, and two through holes arranged at intervals in the Z-axis direction. Have. In the present embodiment, the two through holes of the first exterior plate 210 are arranged at symmetrical positions with respect to the intermediate position of the first exterior plate 210 in the Z-axis direction. Then, the second liquid supply port 5 is attached to the first exterior plate 210 so as to communicate with one of the two through holes, and the second drainage port 6 is out of the two through holes. It is attached so as to communicate with the other through hole.

Further, in the present embodiment, the first liquid supply port 3 and the first liquid drain port 4 are attached to the third exterior plate 212. Specifically, the third exterior plate 212 has two through holes penetrating in a direction orthogonal to the Z-axis direction, and has two through holes arranged at intervals in the Z-axis direction. In the present embodiment, the two through holes of the third exterior plate 212 are arranged at symmetrical positions with respect to the intermediate position of the third exterior plate 212 in the Z-axis direction. Then, the first liquid supply port 3 is attached to the third exterior plate 212 so as to communicate with one of the two through holes, and the first drainage port 4 is among the two through holes. It is attached so as to communicate with the other through hole.

Each of the second exterior plate 211 and the fourth exterior plate 213 has no through hole in the region facing the heat transfer plate laminated body LB, and the corresponding surfaces (second surface Sb, fourth surface) of the heat transfer plate laminated body LB. Completely covers Sd).

The exterior plates 214 and 215 arranged on both sides of the plurality of heat transfer plates 20 in the Z-axis direction correspond to the shape and size of the heat transfer plates 20 as viewed from the Z-axis direction. The plate heat exchanger 1 according to the present embodiment is arranged with the direction in which the plurality of heat transfer plates 20 are overlapped in the vertical direction. Along with this, the heat exchange section 2 serves as exterior plates 214 and 215 arranged on both sides of the plurality of heat transfer plates 20 in the Z-axis direction, and transfers heat to the under plate 214 that supports the lower end of the heat transfer plate laminated body LB. It is provided with an upper plate 215 that is laminated on the upper end of the heat plate laminate LB.

The support frame 216 is composed of a plurality of pillars 216a ... Arranged corresponding to each of the corners of the heat transfer plate 20. In the present embodiment, since the heat transfer plate 20 has a quadrangular shape, four pillars 216a ... Are provided corresponding to the corners of the heat transfer plate 20.

In the present embodiment, the pillar 216a ... Is prismatic, and one corner of itself is aligned with one corner of the heat transfer plate 20 in a state where its center line is aligned with the Z-axis direction. Is placed. That is, the pillars 216a ... Are arranged with their corners along one corner of the heat transfer plate laminated body LB.

The plate heat exchanger 1 according to the present embodiment has lining members 217 arranged between the heat transfer plate laminate LB and the under plate 214 and between the heat transfer plate laminate LB and the upper plate 215, respectively. Be prepared. That is, the plate heat exchanger 1 includes a pair of lining members 217 that sandwich the heat transfer plate laminated body LB in the Z-axis direction, and includes lining members 217 that are fixed to the heat transfer plates 20 that face each other by welding. .. The lining member 217 has a quadrangular shape when viewed from the Z-axis direction, and is provided with notches at four corners (four corners). Along with this, in the present embodiment, the four pillars 216a ... Are arranged in a state of being fitted to the respective corners of the two lining members 217 and 217.

The first exterior plate 210 is connected to the two pillars 216a ... in a liquid-tight state with respect to the two pillars 216a ... On both sides of the first surface Sa of the heat transfer plate laminated body LB, and is connected to the two pillars 216a ... (2) The exterior plate 211 is connected to the two pillars 216a ... in a liquid-tight state with respect to the two pillars 216a ... On both sides of the second surface Sb of the heat transfer plate laminated body LB. Further, the third exterior plate 212 is connected to the two pillars 216a ... in a liquid-tight state with respect to the two pillars 216a ... On both sides of the third surface Sc of the heat transfer plate laminated body LB. , The fourth exterior plate 213 is connected to the two pillars 216a ... In a liquid-tight state with respect to the two pillars 216a ... On both sides of the fourth surface Sd of the heat transfer plate laminated body LB. ..

As a result, the first exterior plate 210 faces the first surface Sa of the heat transfer plate laminate LB at a distance, and the second exterior plate 211 is spaced from the second surface Sb of the heat transfer plate laminate LB. Open and face each other. The third exterior plate 212 faces the third surface Sc of the heat transfer plate laminate LB at a distance, and the fourth exterior plate 213 faces the fourth surface Sd of the heat transfer plate laminate LB at a distance. do.

The under plate 214 and the upper plate 215 are each superposed on the heat transfer plate laminated body LB, and the four pillars 216a ..., the first exterior plate 210, the second exterior plate 211, and the third exterior plate 212 are respectively. , And is connected to the fourth exterior plate 213.

The first partition plate 22 and the second partition plate 23 are connected to a heat transfer plate 20 located at an intermediate position in the Z-axis direction of a plurality of heat transfer plates 20 stacked in the Z-axis direction. Specifically, the first partition plate 22 is one second end edge Ea2 of the heat transfer plate 20 located at an intermediate position in the Z-axis direction among the plurality of heat transfer plates 20 constituting the heat transfer plate laminated body LB. And the third exterior plate 212, and close the space between the second edge Ea2 of the heat transfer plate 20 and the third plate 212 in a liquid-tight manner. On the other hand, the second partition plate 23 has a first end edge Ea1 of one of the heat transfer plates 20 located at an intermediate position in the Z-axis direction among the plurality of heat transfer plates 20 constituting the heat transfer plate laminated body LB. It is in close contact with the first exterior plate 210 and tightly closes between the first end edge Ea1 of the heat transfer plate 20 and the first exterior plate 210.

As a result, the first partition plate 22 and the second partition plate 23 pseudo-divide the heat transfer plate laminated body LB into two blocks B1 and B2 in the Z-axis direction.

Specifically, as shown in FIG. 9, it is on the first surface Sa of one of the blocks B1 and B2 (in this embodiment, the one block B1 on the upper side) of the heat transfer plate laminated body LB. The space between the first welded portions 205 serves as the second inflow port Rb1, and the other blocks B1 and B2 of the heat transfer plate laminated body LB (in the present embodiment, the other block B2 on the lower side). The area between the first welded portions 205 on the first surface Sa is the second outlet Rb2. Along with this, between the first welded portions 205 on the second surface Sb of one of the blocks B1 and B2 (in this embodiment, the one block B1 on the upper side) of the heat transfer plate laminated body LB. A second outlet Rb2 and a second surface Sb on the second surface Sb of any one of the heat transfer plate laminated body LBs, blocks B1 and B2 (in this embodiment, one block B1 on the lower side). The area between one welded portion 205 is the second inflow port Rb1.

Further, as shown in FIG. 10, the second block B1 and B2 (in this embodiment, the other block B2 on the lower side) of any one of the heat transfer plate laminated body LB is on the third surface Sc. The space between the welded portions 206 serves as the first inflow port Ra1, and the third surface Sc of any of the other blocks B1 and B2 of the heat transfer plate laminated body LB (in this embodiment, one block B1 on the upper side). The area between the second welded portions 206 in the above is the first outlet Ra2. Along with this, between the second welded portions 206 on the fourth surface Sd of one of the blocks B1 and B2 (in this embodiment, the other block B2 on the lower side) of the heat transfer plate laminated body LB. Is the first outlet Ra2, and is the second on the fourth surface Sd of any one of the other blocks B1 and B2 of the heat transfer plate laminated body LB (in this embodiment, the one block B1 on the upper side). The area between the welded portions 206 is the first inflow port Ra1.

The plate heat exchanger 1 according to the present embodiment is as described above, and when the first fluid A is supplied from the first liquid supply port 3, the first fluid A is shown in FIGS. 2 and 11. As described above, after flowing through the plurality of first flow paths Ra through the plurality of first inflow ports Ra1 in the other block B2 of the heat transfer plate laminated body LB, the heat transfer plate laminated body LB flows out from the plurality of first outflow ports Ra2 and flows out from the plurality of first outflow ports Ra2, and the fourth exterior plate 213. The direction is changed by. Then, as shown in FIGS. 2 and 12, the first fluid A circulates through the plurality of first flow paths Ra through the plurality of first inflow ports Ra1 in one block B1 of the heat transfer plate laminated body LB. It flows out from the plurality of first outlets Ra2 and is drained from the first drainage port 4.

At the same time, when the second fluid B is supplied from the second liquid supply port 5, the second fluid B becomes one block B1 of the heat transfer plate laminated body LB as shown in FIGS. 3 and 13. After flowing through the plurality of second flow paths Rb through the plurality of second inflow ports Rb1 in the above, the fluid flows out from the plurality of second outlets Rb2, and the direction is changed by the second exterior plate 211. Then, as shown in FIGS. 3 and 14, the second fluid B circulated through the plurality of second flow paths Rb via the plurality of second inflow ports Rb1 in the other block B2 of the heat transfer plate laminated body LB. Above, it flows out from the plurality of second outlets Rb2 and is drained from the second drain port 6.

As the first fluid A flows through the first flow path Ra and the second fluid B flows through the second flow path Rb, the first fluid A and the second fluid B become the first flow path Ra and the first flow path Ra. Heat exchange is performed via the heat transfer plate 20 (heat transfer unit 200) that serves as a boundary with the two flow paths Rb.

By the way, when the first fluid A flows through the first flow path Ra, the first fluid A mainly flows between the heat transfer portions 200 facing each other in the Y-axis direction, but the first fluid A faces the heat transfer portions 200 at intervals. There are those that directly enter between the first middle stage portions 201a and those that flow along the recesses 200a on the first surface S1 of the heat transfer portion 200 that defines the first flow path Ra and enter between the first middle stage portions 201a.

In the present embodiment, as shown in FIG. 9, the heat transfer plate 20 protrudes toward the other party from the first middle stage portion 201a that defines the boundary through which the recess 200a extending from the upstream side of the first flow path Ra opens. Since it has the convex portion 203, it obstructs the flow of the first fluid A that is going to flow between the first middle stage portions 201a. As a result, resistance is given to the first fluid A between the first middle stage portions 201a, and the first fluid A is returned to the main path or stagnated between the first middle stage portions 201a, so that the first middle stage portion 201a is entered. The first fluid A can contribute to heat exchange.

In particular, in the present embodiment, the convex strip 200b has a first convex portion 203 at a position corresponding to each of the opposing heat transfer plates 20, and the first convex portion 203 is on the first surface S1 of the heat transfer portion 200. Because it is lower than, there is a slight space between the first convex portions 203 facing each other. Therefore, the first fluid A between the first middle stage portions 201a can flow to the downstream side through the space between the first convex portions 203. As a result, when impurities or the like are contained in the first fluid A, it is possible to prevent the impurities from accumulating between the first middle stage portions 201a and causing putrefaction or the like.

The same applies when the second fluid B flows through the second flow path Rb. Specifically, as shown in FIG. 10, when the second fluid B flows through the second flow path Rb, the second fluid B mainly flows between the opposite heat transfer portions 200 in the X-axis direction. Some of them directly enter between the second middle stage portions 202a facing each other at intervals, and some flow along the recesses 200a on the second surface S2 of the heat transfer portion 200 defining the second flow path Rb, and the first (2) There is something that gets in between the middle section 202a.

In the present embodiment, the heat transfer plate 20 has a second convex portion 204 protruding toward the other side from the second middle stage portion 202a that defines the boundary through which the recess 200a extending from the upstream side of the second flow path Rb opens. Therefore, the flow of the second fluid B that tries to flow between the second middle stage portion 202a is obstructed. As a result, resistance is given to the second fluid B between the second middle stages 202a, and the second fluid B is returned to the main path or stagnated between the second middle stages 202a, so that the second fluid B enters between the second middle stages 202a. The second fluid B can contribute to heat exchange.

In particular, in the present embodiment, the convex strips 200b have a second convex portion 204 at a position corresponding to each of the opposing heat transfer plates 20, and the second convex portion 204 is on the second surface S2 of the heat transfer portion 200. Because it is lower than, there is a slight space between the second convex portions 204 facing each other. Therefore, the second fluid B between the second middle stage portions 202a can flow to the downstream side through the space between the second convex portions 204. As a result, when impurities or the like are contained in the second fluid B, it is possible to prevent the impurities from accumulating between the second middle stage portion 202a and causing putrefaction or the like.

Further, in the plate heat exchanger 1 according to the present embodiment, the connection portion of the heat transfer plate 20 is prevented from being damaged by the action of the fluid pressure of the fluid.

Specifically, when the first fluid A flows through the first flow path Ra, the fluid pressure acts on the heat transfer plates 20 (heat transfer portions 200) adjacent to each other in the Z-axis direction, and the first fluid A (fluid pressure). ) Adjacent to each other to separate the heat transfer plates 20 (heat transfer portions 200) in the Z-axis direction. At this time, the first bent portion 201b tries to rise with the tip Ea1 side as a fulcrum, and also tries to separate the first end edges Ea1 and Ea1 of the adjacent heat transfer plates 20 from each other. Therefore, a force that causes the adjacent heat transfer plates 20 to separate from each other (a force that causes the first bent portion 201b to rise with the tip Ea1 side as a fulcrum) acts on the first welded portion 205. In the present embodiment, since the first welded portion 205 connecting the first one end edges Ea1 and Ea1 is exposed in the first flow path Ra, the force is exposed in the first flow path Ra. Dispersed on the surface of. Therefore, since the force does not act intensively on one part of the first welded portion 205, the first welded portion 205 sufficiently opposes the first welded portion 205 without cracking or the like.

In particular, in the present embodiment, the first welded portion 205 exposed in the first flow path Ra has two first welded portions 205 along the inner surfaces of the two connected first bent portions 201b, as shown in FIG. Since it is formed so as to include the intersection P1 of the one virtual line VL1, the portion (the portion corresponding to the intersection P1) that is the starting point of the separation between the two first bending portions 201b straddles the two first bending portions 201b. It is filled with the first welded portion 205 formed in the above. As a result, the separation (raising) of the two first bent portions 201b, which causes cracks and the like in the first welded portion 205, can be suppressed. Therefore, in the present embodiment, the first welded portion 205 not only has resistance to the force generated by the influence of the fluid pressure of the first fluid A, but also can eliminate the generating factor affecting itself, so that cracks and cracks occur. The occurrence of damage such as cracks can be further suppressed.

Further, when the second fluid B flows through the second flow path Rb, the fluid pressure acts on the heat transfer plates 20 (heat transfer portions 200) adjacent to each other in the Z-axis direction, and the second fluid B (fluid pressure) is generated. The adjacent heat transfer plates 20 (heat transfer portions 200) are separated from each other in the Z-axis direction. At this time, the second bent portion 202b tries to rise with the tip Ea2 side as a fulcrum, and also tries to separate the second end edges Ea2 and Ea2 of the adjacent heat transfer plates 20 from each other in the same manner. Therefore, a force that causes the adjacent heat transfer plates 20 to separate from each other (a force that causes the second bent portion 202b to rise with the tip Ea2 side as a fulcrum) acts on the second welded portion 206. In the present embodiment, since the second welded portion 206 connecting the second end edges Ea2 and Ea2 is exposed in the second flow path Rb, the force is exposed in the second flow path Rb in the second weld. It is dispersed on the surface of part 206. Therefore, since the force does not act intensively on one part of the second welded portion 206, the second welded portion 206 sufficiently opposes the second welded portion 206 without cracking or the like.

In particular, in the present embodiment, the second welded portion 206 exposed in the second flow path Rb is two, as shown in FIG. 16, along the inner surface of each of the two connected second bent portions 202b. Since it is formed so as to include the intersection P2 of the second virtual line VL2, the portion that becomes the starting point of the separation between the two second bending portions 202b (the portion that coincides with the intersection P2) becomes the two second bending portions 202b. It is filled with a second weld 206 formed straddling it. As a result, the separation (raising) of the two second bent portions 202b, which causes cracks and the like in the second welded portion 206, can be suppressed. Therefore, in the present embodiment, the second welded portion 206 not only has resistance to the force generated by the influence of the fluid pressure of the second fluid B, but also can eliminate the generating factor affecting itself, so that cracks and cracks occur. The occurrence of damage such as cracks can be further suppressed.

As described above, the plate type heat exchanger 1 according to the present embodiment has a contour Ea including at least two pairs of edge edges Ea1 and Ea2, each of which is parallel or substantially parallel to each other when viewed from the Z-axis direction. A plurality of heat transfer plates 20 having a first surface S1 and a second surface S2 facing opposite to the first surface S1 in the Z-axis direction, and Z so as to make the contours Ea coincident or substantially constant. A plurality of heat transfer plates 20 stacked in the axial direction are provided, and each of the plurality of heat transfer plates 20 extends in a direction intersecting each of the two pairs of edge edges Ea1 and Ea2 on the first surface S1. The ridges 200a and the ridges 200b are formed, and the ridges 200b on the second surface S2 have a front-back relationship with the ridges 200a on the first side S1 and the ridges 200b on the first side S1 have a front-back relationship. A pair of first extension portions 201 including a heat transfer portion 200 in which the recess 200a is formed and an edge Ea1 each of which constitutes one pair of the two pairs, each of which is a heat transfer portion 200. A pair of second extensions including a pair of first extension 201 extending from the outer edge Eb1 in the X-axis direction orthogonal to the Z-axis direction and an end edge Ea2 each forming the other pair of the two pairs. A pair of first extension portions 202, each of which includes a pair of second extension portions 202 extending from the outer edge Eb2 of the heat transfer portion 200 in a direction intersecting the Z-axis direction and the X-axis direction. Each of 201 is a first middle stage portion 201a having a base end and a tip in the X-axis direction, and the top of the ridge 200b of the first surface S1 and the ridge 200b of the second surface S2 in the Z-axis direction. The first middle stage portion 201a whose base end is connected to the outer edge Eb1 of the heat transfer portion 200 and the first bent portion having the base end and the tip so as to follow the first virtual plane BL passing between the top and the top. 201b, with the edge Ea1 whose base end is connected to the tip of the first middle stage portion 201a and extends to the first surface S1 side of the heat transfer portion 200, and the tip constitutes one pair of the two pairs. Each of the pair of second extension portions 202 is a second middle stage portion 202a having a base end and a tip in a direction intersecting the Z-axis direction and the X-axis direction. , The outer edge Eb2 of the heat transfer portion 200 along the second virtual plane BL passing between the top of the ridge 200b of the first surface S1 and the top of the ridge 200b of the second surface S2 in the Z-axis direction. The second middle stage portion 202a to which the base end is connected to the second middle stage portion 202a, and the second bent portion 202b having the base end and the tip end, and the base end is connected to the tip end of the second middle stage portion 202a to form the heat transfer portion 200. Extends to the second surface S2 side and has two tips Each of the plurality of heat transfer plates 20 includes a second bent portion 202b which is an end edge Ea2 forming the other pair of the pair, and each of the plurality of heat transfer plates 20 has a first surface S1 of the heat transfer portion 200 in the Z-axis direction. By connecting the tips Ea1 of the first bent portion 201b of the first extending portion 201 facing each other in a state of facing the first surface S1 of the heat transfer portion 200 of the heat transfer plates 20 adjacent to each other on the side. A first flow path Ra for circulating the first fluid A is formed between the first surfaces S1 of the adjacent heat transfer portions 200, and the second surfaces S2 of the heat transfer portions 200 are adjacent to each other on the other side in the Z-axis direction. In a state of facing the second surface S2 of the heat transfer portion 200 of the heat plate 20, the tips Ea2 of the second bent portion 202b of the opposite second extension portion 202 are connected to each other to transfer heat adjacent to each other. A second flow path Rb for passing the second fluid B is formed between the second surfaces S2 of the part 200, and at least the first flow path of the pair of first extension parts 201 in each of the plurality of heat transfer plates 20. The first extending portion 201 reached by the recess 200a starting from the upstream side of Ra is at least one first convex portion 203 protruding from the first middle stage portion 201a in the Z-axis direction, and is the first surface S1. A concave portion having at least one first convex portion 203 protruding toward the heat transfer plate 20 of the other party and having at least the upstream side of the second flow path Rb of the pair of second extension portions 202 as a starting point. The second extending portion 202 to which the strip 200a reaches is at least one second convex portion 204 protruding from the second middle stage portion 202a in the Z-axis direction, and the heat transfer plate 20 of the other party facing the second surface S2. It is provided with at least one second convex portion 204 projecting toward.

According to the above configuration, when the first fluid A reaches between the first middle stage portions 201a facing each other through the recess 200a of the first surface S1 and tries to flow between the first middle stage portions 201a, the first convex Part 203 obstructs the flow of the first fluid A. As a result, resistance is given to the first fluid A between the first middle stage portions 201a, and the first fluid A is returned to the main path or stagnated between the first middle stage portions 201a, so that the first middle stage portion 201a is entered. The first fluid A can contribute to heat exchange.

Further, when the second fluid B reaches between the second middle stage portions 202a facing each other through the recess 200a of the second surface S2 and the second fluid B tries to flow between the second middle stage portions 202a, the second fluid B is second. The protrusion 204 impedes the flow of the second fluid B. As a result, resistance is given to the second fluid B between the second middle stages 202a, and the second fluid B is returned to the main path or stagnated between the second middle stages 202a, so that the second fluid B enters between the second middle stages 202a. The second fluid B can contribute to heat exchange.

As described above, in the plate heat exchanger 1 according to the present embodiment, both the first fluid A and the second fluid B can contribute to heat exchange, so that the linear ends of the adjacent heat transfer plates 20 Even if a flow path is formed by liquid-tightly joining the edges Ea1, Ea1, Ea2, and Ea2 to each other, it is possible to obtain an excellent effect that a decrease in heat exchange efficiency can be suppressed.

In the present embodiment, in each of the plurality of heat transfer plates 20, each of the pair of first extending portions 201 includes at least one first convex portion 203, and each of the pair of second extending portions 202 is provided. At least one second convex portion 204 is provided.

According to the above configuration, since the first convex portion 203 protrudes from both of the first middle stage portions 201a of the adjacent heat transfer plates 20, a large resistance is provided to the first fluid A that is going to flow between the first middle stage portions 201a. Can be given. Further, since the second convex portion 204 protrudes from both of the second middle stage portions 202a of the adjacent heat transfer plates 20, it is possible to give a large resistance to the second fluid B that is going to flow between the second middle stage portions 202a. ..

In particular, in the present embodiment, in each of the plurality of heat transfer plates 20, the first convex portions 203 of the pair of first extension portions 201 are the first of the heat transfer plates 20 of the other party with the first surface S1 facing each other. It is arranged at a position facing the one-convex portion 203, and is formed lower than the top of the ridge 200b of the first surface S1 in the Z-axis direction, and each second convex portion of the pair of second extension portions 202. 204 is arranged at a position facing the second convex portion 204 of the heat transfer plate 20 of the other party facing the second surface S2, and is lower than the top of the convex strip 200b of the second surface S2 in the Z-axis direction. It is formed.

According to the above configuration, since each of the first convex portions 203 facing each other is formed lower than the top of the convex strip 200b of the first surface S1, a space is formed between the first convex portions 203 facing each other. The first fluid A between the middle stage portions 201a can flow to the downstream side through the space between the first convex portions 203. As a result, when impurities or the like are contained in the first fluid A, it is possible to prevent the impurities from accumulating between the first middle stage portions 201a and causing putrefaction or the like. Further, since each of the second convex portions 204 facing each other is formed lower than the top of the convex strip 200b of the second surface S2, a space is formed between the second convex portions 204 facing each other, and the second middle stage portion 202a is formed. The second fluid B in between can flow to the downstream side through the space between the second convex portions 204. As a result, when impurities or the like are contained in the second fluid B, it is possible to prevent the impurities from accumulating between the second middle stage portion 202a and causing putrefaction or the like.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that modifications can be made as appropriate without departing from the gist of the present invention.

In the above embodiment, the contour Ea of the heat transfer plate 20 includes two pairs of edge edges Ea1 and Ea2, and the heat transfer plate 20 is formed into a quadrangular shape when viewed from the Z-axis direction, but the present invention is not limited to this. For example, the contour Ea of the heat transfer plate 20 may include three or more pairs of edge edges, and the heat transfer plate 20 may have a polygonal shape of hexagon or more when viewed from the Z-axis direction, or the contour Ea of the heat transfer plate 20 may be formed. May include two or more pairs of edges and the heat transfer plate 20 may be non-polygonal when viewed from the Z-axis direction.

In this case, the contour Eb of the heat transfer portion 200 is shaped like the contour Ea of the heat transfer plate 20, and the pair of first extending portions 201, 201 are included in the contour Eb of the heat transfer portion 200. A pair of second extending portions 202, 202 are included in the contour Eb of the heat transfer portion 200, extending from Eb1 (outer edges Eb1, Eb1 parallel to or substantially parallel to the edge included in the contour Ea of the heat transfer plate 20). A pair of outer edges Eb2 and Eb2 (outer edges Eb2 and Eb2 parallel to or substantially parallel to the edge included in the contour Ea of the heat transfer plate 20), and a pair of extending portions 201 and 201 of the first extending portions 201 and 201. It may extend from a pair of outer edges Eb2 and Eb2 excluding the outer edges Eb1 and Eb1. Also in this case, the first convex portion 203 protruding toward the other party from the first middle stage portion 201a of the first extending portion 201, and the second convex portion protruding toward the other party from the second middle stage portion 202a of the second extending portion 202. By providing 204, the same actions and effects as those of the above embodiment can be obtained.

In the above embodiment, the heat transfer plate 20 includes a first convex portion 203 projecting from each of the pair of first extension portions 201, 201, and a second projecting portion from each of the pair of second extension portions 202, 202. The biconvex portion 204 is provided, but the present invention is not limited to this. For example, of the pair of first extension portions 201, 201, only the first extension portion 201 reached by the recess 200a starting from the upstream side of the first flow path Ra is transmitted from the first middle stage portion 201a to the other party. The second convex portion 203 that protrudes toward the heat plate 20 is provided, and the concave groove 200a that starts from the upstream side of the second flow path Rb of the pair of second extending portions 202, 202 reaches. Only the extension portion 202 may include a second convex portion 204 protruding from the second middle stage portion 202a toward the heat transfer plate 20 of the other party.

In the above embodiment, the first convex portion 203 is arranged at the substantially central position of the first middle stage portion 201a, and the second convex portion 204 is arranged at the substantially central position of the second middle stage portion 202a, but the present invention is limited to this. The first convex portion 203 may be arranged at a position other than the central position in the longitudinal direction of the first middle stage portion 201a, and the second convex portion 204 may be arranged at a position other than the central position in the longitudinal direction of the second middle stage portion 202a. May be placed in. Further, the first convex portion 203 may be provided at a plurality of locations of a single first middle stage portion 201a, and the second convex portion 204 may be provided at a plurality of locations of a single second middle stage portion 202a. May be good.

In the above embodiment, in each of the heat transfer plates 20 adjacent to each other in the Z-axis direction, the first convex portion 203 protruding from the first middle stage portion 201a is arranged at a corresponding position (position facing each other), and the second middle stage portion The second convex portion 204 protruding from the 202a is arranged at a corresponding position (position facing each other), but the present invention is not limited to this. For example, in each of the heat transfer plates 20 adjacent to each other in the Z-axis direction, the first convex portion 203 protruding from the first middle stage portion 201a is positioned at a position displaced (non-opposing position) in the longitudinal direction of the first middle stage portion 201a. The second convex portion 204 that is arranged and protrudes from the second middle stage portion 202a may be arranged at a position displaced (non-opposing position) in the longitudinal direction of the second middle stage portion 202a.

In the above embodiment, although the reference direction is different, the number and arrangement of the first convex portion 203 and the second convex portion 204 correspond, but the present invention is not limited to this. The number and arrangement of the first convex portion 203 and the second convex portion 204 may be different.

In the above embodiment, the first convex portion 203 is formed lower than the ridge 200b on the first surface S1 of the heat transfer portion 200, and a space (gap) is formed between the first convex portion 203 and the opposite first convex portion 203. , Not limited to this. For example, the first convex portion 203 may be set at the same height as the convex strip 200b on the first surface S1 of the heat transfer portion 200, and the corresponding first convex portions 203 may come into contact with each other. Even in this way, it is possible to prevent the flow of the first fluid A between the first middle stage portions 201a and prevent the first fluid A from flowing without receiving resistance.

Therefore, similarly to the above embodiment, the first fluid A between the first middle stage portions 201a can contribute to heat exchange. However, considering that the first fluid A contains impurities, the first convex portion 203 is made lower than the convex strip 200b on the first surface S1 of the heat transfer portion 200 and faces the first convex portion 203, as in the above embodiment. Needless to say, it is preferable to form a space (gap) between the one convex portions 203. The same applies to the second convex portion 204 in these points.

In the above embodiment, each of the first middle stage portion 201a and the second middle stage portion 202a is a reference plane serving as a boundary between the ridges 200b of the first surface S1 of the heat transfer portion 200 and the ridges 200b of the second surface S2. (1st virtual plane, 2nd virtual plane) It is provided so as to pass through the BL, but the present invention is not limited to this. For example, at least one of the first middle stage portion 201a and the second middle stage portion 202a is in the Z-axis direction from the boundary between the ridge 200b of the first surface S1 of the heat transfer portion 200 and the ridge 200b of the second surface S2. It may be provided along the virtual plane BL passing through the deviated position.

Further, the first virtual plane BL which is the reference for the arrangement of the first middle stage portion 201a and the second virtual plane BL which is the reference for the arrangement of the second middle stage portion 202a are common virtual planes, but the limitation is limited to this. Not done. For example, the first virtual plane BL and the second virtual plane BL may be virtual planes that pass through different positions in the Z-axis direction. That is, the first middle stage portion 201a and the second middle stage portion 202a may extend from different positions in the Z-axis direction. However, the first middle stage portion 201a and the second middle stage portion 202a are located between the ridges 200b of the first surface S1 of the heat transfer portion 200 and the ridges 200b of the second surface S2 in the Z-axis direction. It is premised that (the position is not the same level as the top of the ridge 200b).

1 ... Plate heat exchanger, 2 ... Heat exchange unit, 3 ... First fluid supply port, 4 ... First fluid supply port, 5 ... Second fluid supply port, 6 ... Second fluid drainage port, 20 ... Heat transfer Plate, 21 ... Exterior, 22 ... First partition plate, 23 ... Second partition plate, 200 ... Heat transfer part, 200a ... Concave, 200b ... Convex, 201 ... First extension, 201a ... First middle stage Part, 201b ... 1st bent part, 202 ... 2nd extension part, 202a ... 2nd middle part, 202b ... 2nd bent part, 203 ... 1st convex part, 204 ... 2nd convex part, 205 ... 1 welded part, 206 ... second welded part, 210 ... first exterior plate (exterior plate), 211 ... second exterior plate (exterior plate), 212 ... third exterior plate (exterior plate), 213 ... fourth exterior plate (Exterior plate), 214 ... Under plate (Exterior plate), 215 ... Upper plate (Exterior plate), 216 ... Support frame, 216a ... Pillar, 217 ... Lining member, A ... First fluid, B ... Second fluid, B1 ... block, B2 ... block, BL ... reference plane (first virtual plane, second virtual plane), Ea ... contour, Ea1 ... first end edge (edge), Ea2 ... second edge (edge), Eb ... contour, Eb1 ... first outer edge (outer edge), Eb2 ... second outer edge (outer edge), LB ... heat transfer plate laminate, P1 ... intersection, P2 ... intersection, Ra ... first flow path, Ra1 ... first inflow port, Ra2 ... 1st outlet, Rb ... 2nd flow path, Rb1 ... 2nd inlet, Rb2 ... 2nd outlet, S1 ... 1st surface, S2 ... 2nd surface, Sa ... 1st surface, Sb ... 2nd surface , Sc ... third surface, Sd ... fourth surface, VL1 ... first virtual line (virtual line), VL2 ... second virtual line (virtual line)

Claims (2)

A plurality of heat transfer plates each having a contour including at least two pairs of edges parallel to or substantially parallel to each other when viewed from the first direction .
It has a first surface in the first direction and a second surface facing away from the first surface, and is provided with a plurality of heat transfer plates stacked in the first direction so that the contours are aligned or substantially constant .
Each of the multiple heat transfer plates
A plurality of recesses and ridges extending in a direction intersecting each of the two pairs of edge edges are formed on the first surface, and the ridges and ridges having a front-back relationship with the dents on the first surface are formed on the second surface. The heat transfer part where the convex stripes on the first surface and the concave stripes on the front and back are formed ,
Their respective has a first extending portion of the pair comprising an edge constituting one of the pair of the two pairs, extending in the second direction, each perpendicular to the first direction from the outer edge of the heat transfer portion a first extending portion of the pair of out,
Their respective has a second extending portion of the pair comprising an edge which constitutes the other pair of the two pairs, the direction of each of which crosses the first direction and the second direction from the outer edge of the heat transfer portion and a pair of second extension portions extending in,
Each of the first extending portion of the pair,
A first middle stage portion having a base end and a tip in the second direction, and a first virtual passing between the top of the ridge on the first surface and the top of the ridge on the second surface in the first direction. The first middle stage part whose base end is connected to the outer edge of the heat transfer part along the plane ,
A first bent portion having a base end and a tip, the base end is connected to the tip of the first middle stage portion and extends to the first surface side of the heat transfer portion, and the tip is one of two pairs. It has a first bend that is the edge that makes up the pair ,
Each of the pair of second extending portion,
The one-way and second a middle portion having a proximal and a distal end in a direction intersecting the second direction, the top of the top of one side of the convex and the second surface of the ridges in a first direction The second middle stage part whose base end is connected to the outer edge of the heat transfer part so as to follow the second virtual plane passing between the two .
A second bent portion having a base end and a tip, the base end is connected to the tip of the second middle stage portion and extends to the second surface side of the heat transfer portion, and the tip is the other of the two pairs. It has a second folding part that is the edge that makes up the pair ,
Each of the plurality of heat transfer plates has a first extension facing each other with the first surface of the heat transfer portion facing the first surface of the heat transfer portions of adjacent heat transfer plates on one side in the first direction. By connecting the tips of the first bent portions of the portion, a first flow path for flowing the first fluid is formed between the first surfaces of the adjacent heat transfer portions, and the second surface of the heat transfer portion is formed. By connecting the tips of the second bent portions in the second extending portion facing each other in a state of facing the second surface of the heat transfer portions of the adjacent heat transfer plates on the other side of the first direction. A second flow path for passing the second fluid is formed between the second surfaces of the adjacent heat transfer portions .
In each of the plurality of heat transfer plates,
The first extending portion concave reaches you start the upstream side of the at least first channel of the first extending portion of a pair, the first from the first middle portion of the at least one projecting in a first direction It is provided with at least one first convex portion that is a convex portion and projects toward the heat transfer plate of the other party with the first surfaces facing each other .
The second extending portion concave reaches that at least the second flow path starting from the upstream side of one of the second extended portion of a pair has at least one first projecting from the second middle portion in a first direction It is a biconvex portion and includes at least one second convex portion that protrudes toward the heat transfer plate of the other party with the second surfaces facing each other .
In each of the multiple heat transfer plates
Each first convex portion of the pair of first extending portions is arranged at a position facing the first convex portion of the heat transfer plate of the other party with the first surface facing the first surface, and is arranged on the first surface in the first direction. Formed lower than the top of the ridge,
Each second convex portion of the pair of second extension portions is arranged at a position facing the second convex portion of the heat transfer plate of the other party with the second surface facing each other, and the second convex portion is arranged in the first direction. plate heat exchanger according to claim Rukoto formed lower than the top portion of the convex. In each of the plurality of heat transfer plates, each of the pair of first extension portions includes at least one of the first convex portions .
The plate heat exchanger according to claim 1, wherein each of the pair of second extending portions includes at least one of the second convex portions.

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