JP7119016B2 - plate heat exchanger - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate heat exchanger that includes a plurality of heat transfer plates that are superimposed and an introduction section that introduces a fluid between the heat transfer plates.

2. Description of the Related Art Conventionally, a plate heat exchanger 100 including a plurality of heat transfer plates 101 superimposed as shown in FIG. 12 is known (see Patent Document 1).

Specifically, the plate heat exchanger 100 includes a main body having a plurality of heat transfer plates 101 that are superimposed and a pair of frame plates 102 that sandwich the plurality of heat transfer plates 101 from both sides in the stacking direction of the heat transfer plates 101. a cylindrical first introduction portion 104 for introducing the first fluid A into the body portion 103; and a second introduction portion 105 for introducing the second fluid B into the body portion 103.

In the body portion 103 , first flow paths 106 through which the first fluid A flows and second flow paths 107 through which the second fluid B flows are alternately formed via the heat transfer plates 101 . Further, in the main body portion 103, by penetrating each heat transfer plate 101, a first communication passage extending in the stacking direction and allowing the first fluid A introduced from the first introduction portion 104 to flow into each first flow passage 106 108, a second communication path 109 that extends in the stacking direction by penetrating each heat transfer plate 101 and allows the second fluid B introduced from the second introduction part 105 to flow into each second flow path 107; is formed.

Each of the pair of frame plates 102 is a thick plate-like member. In addition, the first introduction portion 104 and the second introduction portion 105 are cylindrical portions, and the distal ends thereof are located at the periphery of the hole of the heat transfer plate 101 (the periphery of the hole constituting the first communication passage 108 or the second communication passage 109). part) 110 and 111 by brazing.

In this plate heat exchanger 100, the first fluid A introduced from the first introduction portion 104 into the first communication passage 108 flows into each of the first flow passages 106, and from the second introduction portion 105 into the second communication passage 109. The introduced second fluid B flows through each second channel 107 . As a result, the first fluid A and the second fluid B exchange heat through the heat transfer plate 101 separating the first flow path 106 and the second flow path 107 .

JP-A-2000-193390

In the plate heat exchanger 100 described above, for example, when a high-temperature fluid such as steam as the first fluid A is introduced from the first introduction portion 104 into the main body portion 103, the first introduction portion 104 and the first fluid A rise to a similar temperature. At this time, a portion (peripheral edge portion) 110 of the heat transfer plate 101 to which the tip of the first introduction portion 104 is connected and a portion in the vicinity thereof are similar to the first introduction portion 104 in that the first fluid A It rises to temperature and tries to thermally expand.

However, the heat transfer plate 101 and the frame in which the hole peripheral portion 110 is constrained by the first introduction portion 104 brazed to the hole peripheral portion 110 and the portion of the heat transfer plate 101 in the vicinity of the hole peripheral portion 110 is adjacent to each other. Since it is restricted by the plate 102 and the like, the hole peripheral portion 110 and its vicinity cannot be thermally expanded, and a large thermal stress is generated in this portion.

On the other hand, when the supply of the first fluid A is stopped, the temperature of the hole peripheral portion 110 and its neighboring portion decreases, and the thermal stress is reduced.

Due to the repeated stress generated by the series of processes of supplying and stopping the high-temperature first fluid A, thermal fatigue cracks originating from constrained portions such as the hole peripheral portion 110 and the vicinity thereof in the heat transfer plate 101 becomes more likely to occur.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a plate heat exchanger capable of suppressing the generation of thermal stress at a connection portion between a fluid introduction portion and a heat transfer plate and at a portion in the vicinity thereof.

The plate heat exchanger of the present invention is
a plate stack having a plurality of heat transfer plates each having a first hole and being stacked in a predetermined direction;
a cylindrical first introduction part whose tip is inserted into the plate stacking part along the predetermined direction and introduces the first fluid into the plate stacking part;
a second introduction section for introducing a second fluid into the plate stacking section;
The plate laminate portion has a plurality of inter-plate spaces defined between the heat transfer plates, and extends along the predetermined direction by connecting the first holes of the heat transfer plates to the first introducing portion. a first passageway that allows the first fluid introduced by to flow into a first inter-plate space that is a predetermined inter-plate space among the plurality of inter-plate spaces;
The tip of the first introduction part is the first heat transfer plate of the upstream heat transfer plate in the direction of introduction of the first fluid by the first introduction part of the two heat transfer plates defining the first inter-plate space. A hole peripheral edge portion of a hole, or a stacked portion that is a hole peripheral edge portion overlapping with the hole peripheral edge portion, and is a hole peripheral edge portion of the first hole of the heat transfer plate adjacent to the heat transfer plate having the hole peripheral edge portion. connected to the lamination site,
The second fluid flows in the inter-plate space, which is in contact with the distal end portion including the distal end on the peripheral surface of the first introduction portion, among the inter-plate spaces.

According to this configuration, when the first fluid has a higher temperature than the second fluid, even if the connecting portion between the first introduction portion and the heat transfer plate is heated by the first fluid, the peripheral surface of the first introduction portion The tip portion is cooled by the second fluid, thereby suppressing the temperature rise of the connection portion between the first introduction portion and the heat transfer plate and the vicinity thereof, and as a result, the connection portion between the first introduction portion and the heat transfer plate. and the generation of thermal stress in the vicinity thereof can be suppressed.

In the plate heat exchanger, when the thickness of the peripheral wall of the first introduction portion is greater than the thickness of the heat transfer plate, the heat capacity of the first introduction portion increases. By cooling the tip portion of the peripheral surface of the second fluid with the second fluid, generation of thermal stress at the connection portion between the first introduction portion and the heat transfer plate and the vicinity thereof can be effectively suppressed.

In the plate heat exchanger,
The plate stacking portion is an upstream plate that is an inter-plate space located upstream in the introduction direction from the first inter-plate space communicating with the first communication passage immediately downstream of the tip of the first introduction portion. having a plurality of interspaces,
Each of the plurality of upstream inter-plate spaces may include an inter-plate space in which the second fluid is circulated and which is in contact with the tip portion of the first introduction section.

According to such a configuration, the second fluid also flows in the inter-plate space (upstream inter-plate space) adjacent to the inter-plate space in contact with the distal end portion of the peripheral surface of the first introduction portion. For this reason, the influence of heat from the first fluid on the second fluid flowing in the inter-plate space in contact with the tip portion is suppressed. By exchanging heat with the second fluid flowing through the inter-plate space (upstream inter-plate space), the second fluid flowing through the inter-plate space in contact with the tip portion is affected by heat from the first fluid. A rise in the temperature of the fluid is suppressed, thereby improving the cooling efficiency for the tip portion of the peripheral surface of the first introduction portion.

Further, in the plate heat exchanger,
The plate stacking portion has a reinforcing plate that is superimposed on the upstream side of the plurality of heat transfer plates in the introducing direction and is thicker than the heat transfer plates,
The plurality of inter-plate spaces includes a space defined between the reinforcing plate and the heat transfer plate adjacent to the reinforcing plate;
A space defined between the reinforcing plate and the heat transfer plate adjacent to the reinforcing plate may allow the second fluid to flow.

According to such a configuration, the space (inter-plate space) defined between the plate (reinforcement plate) for ensuring the strength of the plate heat exchanger and the adjacent heat transfer plate is utilized. As a result, heat exchange between fluids and cooling of the tip portion of the first introduction portion are possible.

Further, in the plate heat exchanger,
At least one of the two heat transfer plates that define the upstream inter-plate space, or at least one of the reinforcing plate and the heat transfer plate that define the upstream inter-plate space, the second fluid is It may have an opening through which it can pass.

According to such a configuration, the second fluid can flow into the upstream inter-plate space from the space adjacent to the upstream inter-plate space (the inter-plate space or the space outside the reinforcing plate).

In this case, for example, in the plate heat exchanger,
each of the plurality of heat transfer plates has a second hole,
The second introduction part is cylindrical, and the tip is inserted into the plate stacking part from the first introduction part side along the predetermined direction,
The plate stacking portion extends along the predetermined direction by connecting the second holes of the heat transfer plates to each other, and allows the second fluid introduced by the second introducing portion to pass through the spaces between the plurality of plates. Having a second communication path for flowing into a second inter-plate space that is a different inter-plate space from the first inter-plate space,
The second inter-plate space communicating with the second communication passage immediately downstream of the tip of the second introducing portion communicates with the first communication passage immediately downstream of the tip of the first introducing portion. Located upstream in the introduction direction with respect to one inter-plate space and included in the plurality of upstream inter-plate spaces,
An upstream inter-plate space other than the second inter-plate space communicating with the second communication path in the plurality of upstream inter-plate spaces communicates with the second inter-plate space communicating with the second communication path through the opening. You may have

According to this configuration, the upstream inter-plate space located on the upstream side in the introduction direction from the tip of the second introduction portion in the plate stacking portion is also communicated with the second inter-plate space communicating with the second communication path. a second fluid is supplied.

Further, in the plate heat exchanger,
The thickness of the peripheral wall of the portion including the tip of the first introduction portion may be smaller than the thickness of the peripheral wall of other portions in the introduction direction.

In this way, by making the thickness of the peripheral wall of the portion (including the tip) connected to the heat transfer plate in the first introduction portion smaller than the thickness of the peripheral wall of other portions, the heat capacity of the portion including the tip can be suppressed. Thereby, the cooling effect of the portion including the tip by the second fluid is improved, and as a result, the generation of thermal stress at the connection portion between the first introduction portion and the heat transfer plate can be suppressed more reliably.

Further, in the plate heat exchanger,
The first introduction portion may have a flange-like portion at the distal end portion of the peripheral surface of the first introduction portion.

According to this configuration, since the flange-shaped portion of the first introduction portion is located in the inter-plate space through which the second fluid flows, the area of the portion cooled by the second fluid at the tip portion of the first introduction portion (surface area ) increases, the cooling efficiency of the portion by the second fluid is improved, and as a result, the temperature rise of the connection portion between the first introduction portion and the heat transfer plate and the vicinity thereof is more effectively suppressed.

in this case,
The flange-shaped portion includes the tip of the first introduction portion and is an upstream heat transfer plate in the introduction direction of the first fluid, of the two heat transfer plates defining the first inter-plate space. is preferably connected to the hole peripheral portion of the first hole of or the lamination portion overlapping with the hole peripheral portion.

In this way, since the flange-like portion includes the tip of the first introduction part, the contact area between the first introduction part and the heat transfer plate increases, so the connection strength between the first introduction part and the heat transfer plate can be sufficiently ensured. That is, with such a configuration, it is possible to both improve the cooling effect at the connecting portion between the first introduction portion and the heat transfer plate and secure the connection strength between the first introduction portion and the heat transfer plate.

Further, the plate heat exchanger is
A closing member that seals the first hole in a state of being inserted into the first hole in the most downstream heat transfer plate among the plurality of heat transfer plates in the introduction direction,
The end of the peripheral portion of the closing member on the side of the first introduction portion is the hole of the first hole of the heat transfer plate on the downstream side in the introduction direction of the two heat transfer plates that define the space between the first plates. A stacking portion that is a peripheral portion or a hole peripheral portion that overlaps with the hole peripheral portion and is a hole peripheral portion of the first hole of the heat transfer plate adjacent to the heat transfer plate having the hole peripheral portion connected to
The second fluid may flow in an inter-plate space that is in contact with a portion including the end of the peripheral surface of the insertion portion of the closing member among the plurality of inter-plate spaces.

According to such a configuration, when the first fluid has a higher temperature than the second fluid, even if the connecting portion between the closing member and the heat transfer plate is heated by the first fluid, the peripheral surface of the insertion portion of the closing member is heated by the first fluid. The portion including the end is cooled by the second fluid, thereby suppressing the temperature rise of the connection portion between the closing member and the heat transfer plate and its vicinity. The occurrence of thermal stress in the vicinity is suppressed.

As described above, according to the present invention, it is possible to provide a plate heat exchanger capable of suppressing the generation of thermal stress at the connecting portion between the fluid introduction portion and the heat transfer plate and the portion in the vicinity thereof.

FIG. 1 is a perspective view of a plate heat exchanger according to this embodiment. FIG. 2 is a front view of the plate heat exchanger. FIG. 3 is an exploded perspective view of the plate heat exchanger with a part of the structure omitted. FIG. 4 is a front view of a heat transfer plate included in the plate heat exchanger and having four corner holes of the same size. FIG. 5 is a front view of a heat transfer plate included in the plate heat exchanger and having four corner holes of different sizes. 6 is a sectional view taken along line VI-VI in FIG. 2. FIG. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 2 and a partially enlarged view of the cross-section. FIG. 9 is a diagram for explaining the configuration of a plate heat exchanger according to another embodiment. FIG. 10 is a diagram for explaining the configuration of a plate heat exchanger according to another embodiment. FIG. 11 is a front view of a heat transfer plate according to another embodiment. FIG. 12 is a cross-sectional view of a conventional plate heat exchanger.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8. FIG.

The plate heat exchanger according to the present embodiment (hereinafter also simply referred to as "heat exchanger") has a plurality of holes 21, 22, 23, and 24, as shown in FIGS. A plate lamination section 2 having a plurality of heat transfer plates 20 laminated in a predetermined direction is provided, and the first fluid A and the second fluid B are heat-exchanged. The heat transfer plate 20 of this embodiment is rectangular and has holes (first hole 21, second hole 22, third hole 23, and fourth hole 24) at four corners. In the following description, the direction (predetermined direction) in which the heat transfer plates 20 are overlapped is defined as the X-axis direction of the orthogonal coordinate system, and the short side direction of the heat transfer plate 20 is defined as the Y-axis direction of the orthogonal coordinate system. Let the long side direction of the plate 20 be the Z-axis direction of an orthogonal coordinate system.

The heat exchanger 1 also includes a first introduction portion 4A for introducing the first fluid A into the plate stacking portion 2, a first outlet portion 4B for leading the first fluid A from the plate stacking portion 2, and a plate stacking portion 2. and a second lead-out portion 5B for leading out the second fluid B from the plate stacking portion 2 . The first lead-in portion 4A and the first lead-out portion 4B have a portion (insertion portion) 411 including the tip 410 of the first hole 21 of the heat transfer plate 20 on one side of the plate laminate portion 2 in the X-axis direction. It is inserted into a hole corresponding to the third hole 23 (see FIGS. 6 and 7). In addition, the second lead-in portion 5A and the second lead-out portion 5B have a portion (insertion portion) 511 including the tip 510 of the second hole 22 of the heat transfer plate 20 on one side of the plate laminated portion 2 in the X-axis direction. and the fourth hole 24 (see FIGS. 6 and 7).

Also, the heat exchanger 1 is inserted into a hole corresponding to the first hole 21 and the third hole 23 of the heat transfer plate 20 on the other side of the plate laminated portion 2 in the X-axis direction, and seals the hole. Two first closing members 6A and two openings corresponding to the second hole 22 and the fourth hole 24 of the heat transfer plate 20 on the other side of the plate stack 2 in the X-axis direction to seal the holes. and two second closing members 6B.

In the heat exchanger 1 of the present embodiment, the connection portions between the components constituting the heat exchanger 1, for example, the contact portion and connection portion between the heat transfer plates 20, the first introduction portion 4A, the first outlet Portions connecting the heat transfer plate 20 to the portion 4B, the second introduction portion 5A, the second lead-out portion 5B, and the heat transfer plate 20 are connected in a liquid-tight state by brazing.

The plate stack section 2 includes a plurality of heat transfer plates 20 stacked in the X-axis direction, and a plurality of reinforcing plates 3A and 3B sandwiching the heat transfer plates from both sides in the X-axis direction. In the plate laminated portion 2, the first inter-plate space SP1 and the second inter-plate space SP2 are alternately formed with the heat transfer plate 20 as a boundary. The first inter-plate space SP1 and the second inter-plate space SP2 are channel spaces through which the fluids A and B can flow. That is, the first inter-plate space SP1 is a space through which the first fluid A can flow, and the second inter-plate space SP2 is a space through which the second fluid B can flow.

4 and 5, each of the plurality of heat transfer plates 20 has a heat transfer portion 25 extending in a direction orthogonal to the X-axis direction and a heat transfer portion extending from the entire outer peripheral edge of the heat transfer portion 25. and an annular fitting portion 29 extending in a direction intersecting with 25 . The heat transfer portion 25 of each heat transfer plate 20 has a plurality of concave portions 25a and a plurality of convex portions 25b. In the plurality of heat transfer plates 20 of the present embodiment, there are two types of arrangement patterns of the concave portions 25a and the convex portions 25b in the heat transfer portions 25. FIG. One of these two types of arrangement patterns (see FIG. 4) extends through the other arrangement pattern (see FIG. 5) in the X-axis direction through the intersection of the vertical center line CL1 and the horizontal center line CL2. It is the same as the configuration rotated 180° around the axis. Below, the configuration of the heat transfer portion 25 of the heat transfer plate 20 having one of the two types of arrangement patterns will be described in detail. The vertical center line CL1 is a line extending in the Z-axis direction from the center position of the heat transfer section 25 in the Y-axis direction. is a line extending to

The heat transfer portion 25 has a rectangular shape elongated in the Z-axis direction when viewed from the X-axis direction. The heat transfer portion 25 has a concave portion 25a and a convex portion 25b. The heat transfer portion 25 of the present embodiment has a plurality of concave portions 25a and a plurality of convex portions 25b on each of the surface (first surface) S1 on one side in the X-axis direction and the surface (second surface) S2 on the other side in the X-axis direction. have.

The heat transfer plate 20 of this embodiment is formed by press-molding a metal plate. Therefore, the concave portion 25a of the first surface S1 of the heat transfer portion 25 and the convex portion 25b of the second surface S2 of the heat transfer portion 25 are in a front-back relationship. Further, the convex portion 25b on the first surface S1 of the heat transfer portion 25 and the concave portion 25a on the second surface S2 of the heat transfer portion 25 have a front-back relationship. That is, in the heat transfer portion 25, the convex portion 25b of the second surface S2 is formed at a position overlapping the concave portion 25a of the first surface S1 when viewed from the X-axis direction, and the concave portion 25a of the second surface S2 is the first surface. It is formed at a position overlapping with the convex portion 25b of the surface S1 when viewed from the X-axis direction.

Specifically, the heat transfer portion 25 includes a main heat transfer portion 26 arranged in the central portion in the Z-axis direction, a pair of end portions 27 arranged at both end portions of the heat transfer portion 25 in the Z-axis direction, and a Z A pair of weir portions 28 arranged between the main heat transfer portion 26 and the end portion 27 on one side and the other side of the main heat transfer portion 26 in the axial direction.

In the heat transfer plate 20, when the fluids A and B flow through the first inter-plate space SP1 and the second inter-plate space SP2 formed with the heat transfer plate 20 as a boundary, the main heat transfer part 26 This is the part where most of the heat exchange between A and B takes place.

The main heat transfer part 26 has a plurality of concave portions 26a (25a) and a plurality of convex portions 26b (25b) on both surfaces. The arrangement and shape of the plurality of concave portions 26a and the plurality of convex portions 26b are set according to the heat transfer efficiency, the types of the fluids (the first fluid A and the second fluid B) that perform heat exchange, and the like. Each of the plurality of concave portions 26a and the plurality of convex portions 26b of the main heat transfer portion 26 of the present embodiment extends in a direction inclined with respect to each of the vertical center line CL1 and the horizontal center line CL2. placement). The plurality of recesses 26 a are included in the plurality of recesses 25 a of the heat transfer section 25 , and the plurality of protrusions 26 b are included in the plurality of protrusions 25 b of the heat transfer section 25 .

Each of the pair of end portions 27 includes a plurality of holes 21, 22, 23, and 24 penetrating in the X-axis direction, that is, the thickness direction of the heat transfer plate 20, and a plurality of recesses 27a (25a) extending in the Y-axis direction. and a plurality of protrusions 27b (25b).

Each end 27 in this embodiment has two holes 21 , 22 , 23 , 24 . These two holes 21, 22, 23, 24 are spaced apart in the Y-axis direction. As a result, holes 21 , 22 , 23 and 24 are arranged at the four corners of the heat transfer plate 20 . In the heat transfer plate 20 of the present embodiment, these four holes (first hole 21, second hole 22, third hole 23, fourth hole 24) are circular holes. The sizes (diameters) of 23 and 24 are the same (see FIG. 4). Among the plurality of heat transfer plates 20 included in the plate stacking portion 2, the second heat transfer plate 20A from one end in the X-axis direction and the second heat transfer plate 20A from the other end are , large-diameter holes 22A and 24A having diameters larger than those of the second hole 22 and the fourth hole 24 are provided at positions corresponding to the second hole 22 and the fourth hole 24 of the remaining heat transfer plate 20 (FIGS. 3 and 4). 5).

Each of the plurality of recesses 27 a and the plurality of protrusions 27 b extends in the Y-axis direction between the two holes 21 , 22 , 23 , 24 in the end portion 27 of the heat transfer plate 20 . Specifically, at the end portion 27 on one side in the Z-axis direction, each of the plurality of concave portions 27a and the plurality of convex portions 27b separates between the first hole 21 and the second hole 22 or the large-diameter hole 22A. It extends in the Y-axis direction. In addition, at the end portion 27 on the other side in the Z-axis direction, each of the plurality of concave portions 27a and the plurality of convex portions 27b extends between the third hole 23 and the fourth hole 24 or the large-diameter hole 24A in the Y-axis direction. extends to The plurality of concave portions 27a and the plurality of convex portions 27b are arranged so that the concave portions 27a and the convex portions 27b are alternately arranged in the Z-axis direction. At each end 27 of this embodiment, each recess 27a extends intermittently in the Y-axis direction between the two holes 21, 22, 23, 24, and each protrusion 27b extends between the two holes 21, 22, It extends continuously in the Y-axis direction between 23 and 24 . The plurality of recesses 27 a are included in the plurality of recesses 25 a of the heat transfer section 25 , and the plurality of protrusions 27 b are included in the plurality of protrusions 25 b of the heat transfer section 25 . Further, in FIGS. 4 and 5, dots are added to the concave portions 27a in order to clarify the concave-convex relationship.

As shown in FIGS. 6 and 7, in a state in which a plurality of heat transfer plates 20 are superimposed, the peripheries ( The hole peripheral portions 210, 220, 230, 240 are opposed to each other while being in contact with each other, or opposed to each other while being spaced apart.

In the example shown in FIG. 4, the hole peripheral portions 210 and 230 of the holes 21 and 23 on one side in the Y-axis direction are recessed (displaced) in the same direction as the recessed portion 27a, and the holes on the other side in the Y-axis direction are recessed (displaced). Hole peripheral portions 220 and 240 of 22 and 24 bulge (displace) in the same direction as the bulging direction of convex portion 27b. On the other hand, in the heat transfer plate 20 adjacent to the heat transfer plate 20 shown in FIG. 4, the hole peripheral portions 210 and 230 of the holes 21 and 23 on one side in the Y-axis direction are in the same direction as the projection 27b. The hole peripheral portions 220 and 240 of the holes 22 and 24 on the other side in the Y-axis direction are recessed (displaced) in the same direction as the recessed portion 27a.

When viewed from the X-axis direction, the amount of displacement in the X-axis direction (the position in the X-axis direction) of the bulging or recessed hole peripheral edge portions 210 and 230 of the end portions 27 of these adjacent heat transfer plates 20 is determined by a plurality of heat transfer plates. When the heat plates 20 are superimposed in the X-axis direction, the hole peripheral portions 210 and 230 of the heat transfer plates 20 adjacent to each other are set to contact each other or to be spaced apart from each other (see FIGS. 6 and 7). . In addition, when viewed from the X-axis direction, the amount of displacement in the X-axis direction (the position in the X-axis direction) of the recessed or protruding hole peripheral edge portions 220 and 240 of the end portions 27 of the adjacent heat transfer plates 20 is The hole periphery portions 220 and 240 of the heat transfer plate 20 are set to be spaced apart from each other or to contact each other. In addition, in FIG. 4, dots are attached to the recessed hole peripheral portions 210 and 230 in order to clarify the concave-convex relationship.

As shown in FIGS. 3 to 5, each of the pair of weir portions 28 is arranged along the first surface S1 or the second surface S2 to direct the fluid A from the first hole 21 or the second hole 22 toward the main heat transfer portion 26. , B in the Y-axis direction, or divert the flow of the fluids A and B from the main heat transfer section 26 toward the third hole 23 or the fourth hole 24 along the first surface S1 or the second surface S2. This is a portion for convergence in the Y-axis direction.

Specifically, each dam portion 28 has a plurality of concave portions 28a (25a) and a plurality of convex portions 28b (25b) on both surfaces. The plurality of concave portions 28a and the plurality of convex portions 28b are determined by the dimension of the main heat transfer portion 26 in the Y-axis direction, the distance from each of the holes 21, 22, 23, and 24 to the main heat transfer portion 26, and the fluid used for heat exchange. The arrangement and form are set according to the types of A and B, etc., and are not limited to the form and arrangement shown in FIGS. In this weir portion 28 as well, when the fluids A and B flow through the first inter-plate space SP1 and the second inter-plate space SP2 formed with the heat transfer plate 20 as a boundary, heat is exchanged between the fluids A and B. is done. The plurality of recesses 28 a are included in the plurality of recesses 25 a of the heat transfer section 25 , and the plurality of protrusions 28 b are included in the plurality of protrusions 25 b of the heat transfer section 25 . Further, in FIGS. 4 and 5, dots are added to the concave portions 28a in order to clarify the concave-convex relationship.

As shown in FIGS. 1 to 3, 6 and 7, the plurality of reinforcing plates include a first reinforcing plate 3A superimposed on one side of the plurality of heat transfer plates 20 in the X-axis direction, and a plurality of heat transfer plates and a second reinforcing plate 3B superimposed on the other side of the plate 20 in the X-axis direction. That is, the plate laminated portion 2 includes at least a pair of reinforcing plates 3A and 3B that sandwich the plurality of heat transfer plates 20 from the outside in the X-axis direction.

Each of the first reinforcing plate 3A and the second reinforcing plate 3B is located at positions corresponding to the holes 21, 22, 23, and 24 of the heat transfer plate 20 (specifically, overlapping positions when viewed from the X-axis direction). has holes 31A, 32A, 33A, 34A, 31B, 32B, 33B and 34B. In the plate laminate portion 2 of the present embodiment, two first reinforcing plates 3A are arranged on one side of the plurality of heat transfer plates 20 in the X-axis direction with a gap in the Z-axis direction, and in the plurality of heat transfer plates 20 Two second reinforcing plates 3B are arranged on the other side in the X-axis direction with an interval in the Z-axis direction. That is, the plate laminated portion 2 of this embodiment has two pairs of reinforcing plates 3A and 3B.

The first reinforcing plate 3A has a shape (contour) corresponding to the end portion 27 and the weir portion 28 of the heat transfer plate 20, and is one side in the X-axis direction of the plurality of heat transfer plates 20 superimposed in the X-axis direction. It is a plate-like member that overlaps the end 27 and the weir 28 of the heat transfer plate 20 at the end of the heat transfer plate 20 . The thickness of this first reinforcing plate 3A is greater than the thickness of the heat transfer plate 20 . The plate laminate section 2 of the present embodiment has two first reinforcing plates 3A, and these two first reinforcing plates 3A are heat transfer plates located at one end of the plurality of heat transfer plates 20 in the X-axis direction. In the plate 20, the end portion 27 and the weir portion 28 on one end side in the Z-axis direction and the end portion 27 and the weir portion 28 on the other end side overlap.

The first reinforcing plate 3A on one end side in the Z-axis direction is positioned at positions corresponding to the first holes 21 and the second holes 22 of the adjacent heat transfer plates 20 (overlapping positions when viewed from the X-axis direction). It has holes 31A and 32A passing through in the axial direction. In addition, the first reinforcing plate 3A on the other side in the Z-axis direction is located at a position corresponding to each of the third hole 23 and the fourth hole 24 of the adjacent heat transfer plate 20 (overlapping position when viewed from the X-axis direction). , and holes 33A and 34A extending in the X-axis direction.

Like the first reinforcing plate 3A, the second reinforcing plate 3B has a shape (contour) corresponding to the end portion 27 and the weir portion 28 of the heat transfer plate 20, and has a plurality of heat transfer plates superimposed in the X-axis direction. It is a plate-like member that overlaps the end 27 and the weir 28 of the heat transfer plate 20 at the other end of the plate 20 in the X-axis direction. The thickness of this second reinforcing plate 3B is greater than the thickness of the heat transfer plate 20 . The plate laminate portion 2 of the present embodiment has two second reinforcing plates 3B, and these two second reinforcing plates 3B are located at the ends of the plurality of heat transfer plates 20 on the other side in the X-axis direction. In the plate 20, the end portion 27 and the weir portion 28 on one end side in the Z-axis direction and the end portion 27 and the weir portion 28 on the other end side overlap.

The second reinforcing plate 3B on one end side in the Z-axis direction is located at a position corresponding to each of the first hole 21 and the second hole 22 of the adjacent heat transfer plate 20 (overlapping position when viewed from the X-axis direction). It has holes 31B and 32B that penetrate in the axial direction. In addition, the second reinforcing plate 3B on the other side in the Z-axis direction is located at a position corresponding to each of the third hole 23 and the fourth hole 24 of the adjacent heat transfer plate 20 (overlapping position when viewed from the X-axis direction). , and holes 33B and 34B extending in the X-axis direction.

A plurality of heat transfer plates 20 and a plurality of reinforcing plates 3A and 3B configured as described above are stacked in the X-axis direction as shown in FIGS. ing. In the plurality of heat transfer plates 20 that are superimposed in the plate stacking portion 2, the fitting portion 29 of one heat transfer plate 20 of the heat transfer plates 20 adjacent in the X-axis direction is adjacent to each other in the X-axis direction. It is fitted to the fitting portion 29 of the other heat transfer plate 20 of the heat transfer plates 20 . At this time, in the plate laminated portion 2, the heat transfer plate 20 having the heat transfer portions 25 having one of the two types of arrangement patterns of the concave portions 25a and the convex portions 25b, and the heat transfer portions having the other arrangement pattern. 25 are alternately arranged in the X-axis direction. In the plate laminated portion 2, the convex portions 25b of the heat transfer plates 20 adjacent to each other in the X-axis direction are brought into contact with each other (see FIG. 8), so that the heat transfer plates 20 are separated from each other. An interspace SP is defined (formed). That is, the plate laminated portion 2 has a plurality of inter-plate spaces SP.

Further, in the plate laminated portion 2, the holes 21, 22, 23, 23 at corresponding positions of the heat transfer plates 20 are connected to each other in the X-axis direction. At this time, the hole periphery portions 210, 220, 230, and 240 facing each other and protruding toward the heat transfer plate 20 on the other side (adjacent) are in contact with each other.

Specifically, the first holes 21, the second holes 22, the third holes 23, and the fourth holes 24 of the heat transfer plates 20 are connected to each other in the X-axis direction and extend in the X-axis direction. (see FIGS. 3, 6 and 7). The flow path space formed by the first holes 21 communicating with each other is the first flow path space for supplying the first fluid A to the first inter-plate space SP1, which is a predetermined inter-plate space among the plurality of inter-plate spaces SP. One inflow passage (first series passage) Pa1. Further, the channel space formed by the communication between the second holes 22 is located in the second inter-plate space SP2, which is an inter-plate space different from the first inter-plate space SP1 of the plurality of inter-plate spaces SP. A second inflow passage (second communication passage) Pb1 for supplying two fluids B is provided. Further, the channel space formed by the communication between the third holes 23 is the first outflow channel Pa2 for causing the first fluid A to flow out from the first inter-plate space SP1. Further, the channel space formed by communicating the fourth holes 24 with each other is the second outflow channel Pb2 for causing the second fluid B to flow out from the second inter-plate space SP2. The first inflow passage Pa1 communicates with the first introduction portion 4A, the first outflow passage Pa2 communicates with the first outlet portion 4B, and the second inflow passage Pb1 communicates with the second introduction portion 5A. The second outflow path Pb2 communicates with the second lead-out portion 5B.

The details of the channel configuration inside the plate stacking section 2 configured as described above will be described later.

The first introduction portion 4A and the first lead-out portion 4B have the same configuration, and the first introduction portion 4A will be described in detail below with reference to FIGS. 1 to 3, 6, and 7. FIG.

The first introduction part 4A is a cylindrical member. The first introduction portion 4A of this embodiment has a tubular shape extending straight in the X-axis direction. The first introduction portion 4A is arranged with the tip 410 inserted into the plate stacking portion 2 . More specifically, the first introduction portion 4A is inserted into the hole 31A of the first reinforcing plate 3A and the first hole 21 of the heat transfer plate 20 in the plate laminated portion 2 .

Specifically, the first introduction part 4</b>A has a cylindrical first body 41 and flanges 42 and 43 provided on the first body 41 . The first introduction part 4</b>A of this embodiment has two flange parts 42 and 43 at the tip of the first main body 41 .

The first main body 41 is a cylindrical portion. The thickness of the peripheral wall of this first main body 41 is greater than the thickness of the heat transfer plate 20 . In the first main body 41, the thickness of the peripheral wall of the insertion portion (the portion including the tip 410) 411 inserted into the plate laminated portion 2 is smaller than the thickness of the peripheral wall of other portions in the X-axis direction. The outer diameter of the insertion site 411 of this embodiment is constant at each position in the X-axis direction, and the inner diameter of the insertion site 411 increases toward the distal end. That is, at the insertion site 411, the thickness of the peripheral wall decreases toward the distal end. In the first main body 41 of this embodiment, the thickness of the peripheral wall at the tip of the insertion portion 411 is also greater than the thickness of the heat transfer plate 20 .

Each of the two flange portions 42 and 43 is a portion extending radially outward from the outer peripheral surface of the insertion portion 411 of the first main body 41 . One flange portion 42 extends radially outward from the tip of the insertion portion 411 and is connected to the hole peripheral portion 210 of the heat transfer plate 20 . The other flange portion 43 extends radially outward from a position spaced apart from the one flange portion 42 on one side in the X-axis direction, and is different from the heat transfer plate 20 to which the one flange portion 42 is connected. It is connected to the hole periphery 210 of the (adjacent) heat transfer plate 20 .

Specifically, the two flange portions 42 and 43 are connected to the surfaces of the hole peripheral portions 210 of the heat transfer plates 20 that are adjacent to each other in the X-axis direction and are spaced apart from each other in the X-axis direction. In other words, the two flange portions 42 and 43 spaced apart in the X-axis direction are sandwiched from the outside in the X-axis direction by the two hole peripheral portions 210 that face each other with a space in the X-axis direction. One flange portion 42 of the present embodiment faces one side in the X-axis direction in the hole peripheral portion 210 of the second heat-transfer plate 20 from one end in the X-axis direction of the plurality of heat transfer plates 20. The other flange portion 43 is connected to the surface facing the other side in the hole peripheral portion 210 of the heat transfer plate 20 at one end in the X-axis direction (see FIG. 6). Note that the tip 410 of the first introduction portion 4A of the present embodiment is the other end of the first introduction portion 4A in the X-axis direction (lower end in FIG. 6), and the other end of the first main body 41 in the X-axis direction. side end (tip surface) and the other side end (surface facing the other side) of one flange portion 42 in the X-axis direction.

The first lead-out portion 4B has the same configuration as the first lead-in portion 4A as described above, and the portion (insertion portion) 411 including the tip 410 is connected to the hole 33A of the first reinforcing plate 3A in the plate laminated portion 2 and the transmission. It is inserted into the third hole 23 of the heat plate 20 (see FIG. 7). One flange portion 42 is formed on a surface facing one side in the X-axis direction in the hole peripheral portion 230 of the second heat-transfer plate 20 from one end in the X-axis direction of the plurality of heat transfer plates 20. The other flange portion 43 is connected to the surface facing the other side in the hole peripheral portion 230 of the heat transfer plate 20 at one end in the X-axis direction.

The second introduction portion 5A and the second lead-out portion 5B have the same configuration, and the second introduction portion 5A will be described in detail below with reference to FIGS. 1 to 3, 6, and 7. FIG.

The second introduction part 5A is a cylindrical member. The second introduction part 5A of this embodiment has a tubular shape extending straight in the X-axis direction. The second introduction part 5A is arranged with the tip 510 inserted into the plate stacking part 2 . More specifically, the second introduction portion 5A is inserted into the hole 32A of the first reinforcing plate 3A in the plate laminated portion 2. As shown in FIG.

Specifically, the second introduction part 5</b>A has a cylindrical second main body 51 and a flange part 52 provided at the tip of the second main body 51 .

The second main body 51 is a cylindrical portion. The thickness of the peripheral wall of the second main body 51 is greater than the thickness of the heat transfer plate 20 . In the second main body 51, the peripheral wall thickness of the insertion portion (the portion including the tip 510) 511 inserted into the plate laminated portion 2 is smaller than the peripheral wall thickness of other portions in the X-axis direction. The outer diameter of the insertion site 511 of this embodiment is constant at each position in the X-axis direction, and the inner diameter of the insertion site 511 increases toward the distal end. That is, at the insertion site 511, the thickness of the peripheral wall decreases toward the distal end. In the second main body 51 of this embodiment, the thickness of the peripheral wall decreases from a portion adjacent to the insertion portion 511 in the X-axis direction toward the distal end 510 .

The flange portion 52 is a portion extending radially outward from the outer peripheral surface of the insertion portion 511 of the second main body 51 . The flange portion 52 of this embodiment extends radially outward from the tip of the insertion portion 511 and is connected to the hole peripheral portion 220 of the heat transfer plate 20 .

Specifically, the flange portion 52 is sandwiched between the hole peripheral portion of the hole 32A of the first reinforcing plate 3A and the hole peripheral portion 220 of the heat transfer plate 20 adjacent to the first reinforcing plate 3A. The flange portion 52 of the present embodiment has a surface facing the other side in the X-axis direction in the hole peripheral portion of the hole 32A of the first reinforcing plate 3A, and a plurality of heat transfer plates 20 facing the surface in the X-axis direction and the surface facing one side in the hole peripheral portion 220 of the heat transfer plate 20 at one end of the heat transfer plate 20 . Note that the tip 510 of the second introduction portion 5A of the present embodiment is the end of the second introduction portion 5A on the other side in the X-axis direction (lower end in FIG. 6), and the end of the second main body 51 in the X-axis direction. It includes an end on the other side (front end surface) and an end on the other side in the X-axis direction of the flange portion 52 (a surface facing the other side).

The second lead-out portion 5B has the same configuration as the second lead-in portion 5A as described above, and the portion (insertion portion) 511 including the tip 510 is inserted into the hole 34A of the first reinforcing plate 3A in the plate laminated portion 2. (See Figure 7). The flange portion 52 is sandwiched between the hole peripheral edge portion of the hole 34A of the first reinforcing plate 3A and the hole peripheral edge portion 240 of the heat transfer plate 20 adjacent to the first reinforcing plate 3A. The flange portion 52 of the present embodiment faces the surface facing the other side in the X-axis direction in the hole peripheral portion of the hole 34A of the first reinforcing plate 3A, and the plurality of heat transfer plates 20 in the X-axis direction. and the surface facing one side in the hole peripheral portion 240 of the heat transfer plate 20 at one end of the heat transfer plate 20 .

The first closing member 6A is a plate-like member, as shown in FIGS. Specifically, the first closing member 6A has a disk-shaped third main body 61A and flange portions 62A and 63A extending from the peripheral surface of the third main body 61A. The first closing member 6A of this embodiment has two flange portions 62A and 63A.

The third main body 61A is arranged while being inserted into the plate laminated portion 2 . More specifically, the third main body 61A is inserted into the holes 31B and 33B of the second reinforcing plate 3B and the first hole 21 or the third hole 23 of the heat transfer plate 20 in the plate laminated portion 2 . In the third main body 61A, one surface in the X-axis direction is recessed except for the peripheral edge portion.

One flange portion 62A of the two flange portions 62A and 63A spreads radially outward from one end of the third main body 61A in the X-axis direction and is connected to the hole peripheral portions 210 and 230 of the heat transfer plate 20. It is The other flange portion 63A spreads radially outward from a position spaced apart from the one flange portion 62A on the other side in the X-axis direction, and is connected to the hole peripheral portions 210 and 230 of the heat transfer plate 20. .

Specifically, the two flange portions 62A and 63A are connected to the surfaces of the hole peripheral portions 210 of the heat transfer plates 20 that are adjacent to each other in the X-axis direction and are spaced apart from each other in the X-axis direction. In other words, the two flange portions 62A and 63A spaced apart in the X-axis direction are sandwiched from the outside in the X-axis direction by the two hole peripheral portions 210 and 230 facing each other with a space in the X-axis direction. . One flange portion 62A of the present embodiment extends from the end of the plurality of heat transfer plates 20 on the other side in the X-axis direction to the other side in the X-axis direction at the hole peripheral portions 210 and 230 of the second heat transfer plate 20. The other flange portion 63A is connected to the surface facing one side in the hole peripheral edge portions 210 and 230 of the heat transfer plate 20 at the other end in the X-axis direction (FIGS. 6 and 6). See Figure 7). It should be noted that the one-side end in the X-axis direction of the peripheral portion of the first closing member 6A of the present embodiment is the one-side end (the surface facing one side) of the peripheral portion of the third main body 61A in the X-axis direction. , and one end (surface facing one side) of one flange portion 62A in the X-axis direction.

The second closing member 6B is a plate-like member. Specifically, the second closing member 6B has a disk-shaped fourth main body 61B and a flange portion 62B extending from the peripheral surface of the fourth main body 61B.

The fourth main body 61B is arranged in a state of being inserted into the plate laminated portion 2. As shown in FIG. More specifically, the fourth main body 61B is inserted into the holes 32B and 34B of the second reinforcing plate 3B in the plate laminate portion 2. As shown in FIG.

The flange portion 62B is a portion extending radially outward from the fourth main body 61B. The flange portion 62B of the present embodiment spreads radially outward from a portion of the outer peripheral surface of the fourth main body 61B excluding the end portion on the other side in the X-axis direction, and is connected to the hole peripheral portions 220 and 240 of the heat transfer plate 20. It is

Specifically, the flange portion 62B is sandwiched between the hole peripheral portions of the holes 32B and 34B of the second reinforcing plate 3B and the hole peripheral portions 220 and 240 of the heat transfer plate 20 adjacent to the second reinforcing plate 3B. there is The flange portion 62B of the present embodiment faces the surface facing one side in the X-axis direction in the hole peripheral portions of the holes 32B and 34B of the second reinforcing plate 3B, and the surface facing the other side in the hole peripheral portions 220 and 240 of the heat transfer plate 20 at the other end in the axial direction.

A plurality of flow passage spaces through which the first fluid A and the second fluid B flow are formed inside the plate laminate portion 2 of the heat exchanger 1 configured as described above. The detailed configuration of these flow path spaces will be described below with reference to FIGS. 3 and 6 to 8. FIG.

In the plate laminated portion 2 of the present embodiment, as described above, the inter-plate spaces SP are defined between the plurality of heat transfer plates 20 that are overlapped.

Among the plurality of inter-plate spaces SP, the inter-plate space SP communicating with the first inflow path Pa1 and the first outflow path Pa2 is the first inter-plate space SP1 through which the first fluid A flows, and the second inflow path Pb1 and The inter-plate space SP communicating with the second outflow path Pb2 is the second inter-plate space SP2 through which the second fluid B flows. That is, in the plate laminated portion 2, the inter-plate space SP that directly communicates with the first inflow path Pa1, the first outflow path Pa2, the second inflow path Pb1, and the second outflow path Pb2 is the first inter-plate space SP1 or the second plate space SP1. It is the interspace SP2. In the heat exchanger 1, the first fluid A and the second fluid B exchange heat when flowing through the mutually adjacent first inter-plate space SP1 and second inter-plate space SP2.

In addition, the first fluid A in the first introduction portion 4A is discharged from the first inter-plate space SP1, which is in communication with the first inflow passage Pa1 immediately downstream of the tip 410 of the first introduction portion 4A, among the plurality of inter-plate spaces SP. (Refer to the arrow of symbol A in FIG. 6: hereinafter simply referred to as the "introduction direction".) is the upstream inter-plate space SPu. The plate stacking portion 2 has a plurality of upstream inter-plate spaces SPu. The plate stacking portion 2 of this embodiment has two upstream inter-plate spaces SPu. Specifically, in the plate stacking section 2 of the present embodiment, the upstream inter-plate space SPu extends from the most upstream inter-plate space SP in the introduction direction to the second downstream inter-plate space SP.

The plurality of upstream inter-plate spaces SPu may include a second inter-plate space SP2. That is, at least one upstream inter-plate space SPu among the plurality of upstream inter-plate spaces SPu may directly communicate with the second inflow path Pb1 and the second outflow path Pb2. In the plate stacking portion 2 of the present embodiment, one of the upstream inter-plate spaces SPu, which is located on the most downstream side, also serves as the second inter-plate space SP2.

The upstream inter-plate spaces SPu other than the upstream inter-plate space SPu that also serves as the second inter-plate space SP2 in the plurality of upstream inter-plate spaces SPu are divided into two (adjacent) spaces that define each upstream inter-plate space SPu. The second fluid B flows in or out through the opening G<b>1 (see FIGS. 6 and 7 ) of at least one of the heat transfer plates 20 . That is, the upstream inter-plate spaces SPu communicate with each other through the openings G1 of at least one of the two heat transfer plates 20 defining each upstream inter-plate space SPu.

In the plate stacking portion 2 of the present embodiment, the peripheral portion of the large-diameter hole 22A of the second heat transfer plate 20 from the most upstream heat transfer plate 20 and the tip 510 of the second introduction portion 5A, specifically, Through a gap (opening G1) formed between the heat transfer plate 20 to which the tip 510 is connected and the hole peripheral portion 220, the heat flows into the upstream inter-plate space SPu that also serves as the second inter-plate space SP2. Part of the second fluid B flows into the most upstream space SPu between the upstream plates.

Further, the hole peripheral portion of the large diameter hole 24A of the second heat transfer plate 20 and the tip 510 of the second lead-out portion 5B, more specifically, the hole peripheral portion 240 of the heat transfer plate 20 connected to the tip 510. Through the gap (opening G1) formed between Then, it merges with the second fluid B flowing out from the upstream inter-plate space SPu, which also serves as the second inter-plate space SP2.

In addition, at least one of the plurality of upstream inter-plate spaces SPu has a distal end portion (a portion corresponding to the insertion portion 411) including the distal end 410 of the peripheral surface of the first introduction portion 4A and a second inter-plate space SPu. It is in contact with a distal end portion (a portion corresponding to an insertion portion 411) including a distal end 410 of the peripheral surface of one lead-out portion 4B. In the plate stacking section 2 of the present embodiment, the most upstream inter-plate space SPu is in contact with the tip portions of the first introduction section 4A and the first extraction section 4B. The tip portion is the two flange portions 42 and 43 and the portion between the two flange portions 42 and 43 on the peripheral surfaces of the first introduction portion 4A and the second introduction portion 5A.

In addition, among the plurality of inter-plate spaces SP, between the first plates communicating with the first inflow path Pa1 immediately upstream of the first closing member 6A (specifically, the upstream end of the peripheral edge of the third main body 61A) The inter-plate space SP located downstream of the space SP1 in the introduction direction is the downstream inter-plate space SPd. The plate stacking portion 2 has a plurality of downstream inter-plate spaces SPd. The plate stacking part 2 of this embodiment has two downstream inter-plate spaces SPd. Specifically, in the plate stacking section 2 of the present embodiment, the downstream inter-plate space SPd is from the most downstream inter-plate space SP in the introduction direction to the second inter-plate space SP on the upstream side.

These downstream inter-plate spaces SPd may include a second inter-plate space SP2. That is, at least one downstream inter-plate space SPd among the plurality of downstream inter-plate spaces SPd may directly communicate with the second inflow path Pb1 and the second outflow path Pb2. In the plate stacking portion 2 of the present embodiment, one of the plurality of downstream inter-plate spaces SPd, which is located on the most upstream side, also serves as the second inter-plate space SP2.

The downstream inter-plate spaces SPd other than the downstream inter-plate spaces SPd that also serve as the second inter-plate spaces SP2 in the plurality of downstream inter-plate spaces SPd are divided into two (adjacent) spaces that define each downstream inter-plate space SPd. The second fluid B flows in or out through the opening G2 (see FIGS. 6 and 7) of at least one of the heat transfer plates 20 . That is, the downstream inter-plate spaces SPd communicate with each other through the openings G2 of at least one of the two heat transfer plates 20 defining each downstream inter-plate space SPd.

In the plate stacking portion 2 of the present embodiment, the hole periphery of the large-diameter hole 22A of the second heat transfer plate 20 from the heat transfer plate 20 located furthest downstream and the upstream end of the second closing member 6B are described in detail. passes through a gap (opening G2) formed between the hole periphery 220 of the heat transfer plate 20 to which the edge is connected, into the downstream inter-plate space SPd that also serves as the second inter-plate space SP2. A portion of the inflowing second fluid B flows into the most downstream inter-plate space SPd.

Further, the hole periphery of the large diameter hole 24A of the second heat transfer plate 20 and the upstream end of the second closing member 6B, more specifically, the hole periphery of the heat transfer plate 20 connected to these ends. 240, the second fluid B in the downstream inter-plate space SPd on the most downstream side flows into the downstream inter-plate space SPd that also serves as the second inter-plate space SP2. and joins the second fluid B flowing out from the downstream inter-plate space SPd, which also serves as the second inter-plate space SP2.

Further, at least one downstream inter-plate space SPd among the plurality of downstream inter-plate spaces SPd is in contact with a portion including the downstream end of the first closing member 6 on the circumferential surface of the first closing member 6A. In the plate stacking portion 2 of the present embodiment, the most downstream inter-plate space SPd is in contact with the peripheral surface of each first closing member 6A. This peripheral surface is the two flange portions 62A, 63A of the first closing member 6A and the portion between the two flange portions 62A, 63A.

In the plate stacking portion 2, a second inter-plate space SP2 that communicates with the second inflow passage Pb1 immediately downstream of the tip 510 of the second introduction portion 5A and also serves as the upstream inter-plate space SPu. The inter-plate space SP2 is adjacent to the first inter-plate space SP1, which communicates with the first inflow passage Pa1 immediately downstream of the tip 410 of the first introduction portion 4A, on the upstream side in the introduction direction.

Further, among the plurality of inter-plate spaces SP, the plurality of inter-plate spaces SP between the upstream inter-plate space SPu and the downstream inter-plate space SPd are the first inter-plate space SP1 or the second inter-plate space SP2. be. Specifically, between the upstream inter-plate space SPu and the downstream inter-plate space SPd, the first inter-plate space SP1 and the second inter-plate space SP2 are alternately arranged in the introduction direction. Then, in the introduction direction, the most downstream upstream inter-plate space SPu and the downstream adjacent plate inter-plate space SP, and the most upstream downstream inter-plate space SPd and the upstream adjacent plate inter-plate space SP are both the first inter-plate space SP1.

In the heat exchanger 1 configured as described above, for example, when steam, which is a high-temperature fluid, is used as the first fluid A, and water, which is a low-temperature fluid, is used as the second fluid B, these first fluids A and Heat exchange with the second fluid B takes place. Specifically, it is as follows. In this embodiment, the temperature of the first fluid A is approximately 110.degree. C. to 160.degree. C., and the temperature of the second fluid B is approximately 10.degree.

The first fluid A is introduced into the plate stacking portion 2 from the first introduction portion 4A. The first fluid A introduced into the plate stacking portion 2 flows into each first inter-plate space SP1 from the first inflow path Pa1. Then, the first fluid A that has flowed through each first inter-plate space SP1 flows out to the first outflow path Pa2 and is discharged to the outside of the plate stacking part 2 from the first outlet part 4B.

On the other hand, the second fluid B is introduced into the plate stacking portion 2 from the second introduction portion 5A. The second fluid B introduced into the plate stacking portion 2 flows into each of the second inter-plate spaces SP2 from the second inflow path Pb1. Then, the second fluid B that has flowed through each second inter-plate space SP2 flows out to the second outflow path Pb2, and is discharged to the outside of the plate stacking part 2 from the second outlet part 5B.

Between the upstream inter-plate space SPu and the downstream inter-plate space SPd in the plate stacking portion 2, there is a first inter-plate space SP1 through which the first fluid A flows and a second inter-plate space SP1 through which the second fluid B flows. Since the spaces SP2 are alternately arranged in the introduction direction (X-axis direction), the first fluid A flows through each first inter-plate space SP1, and the second fluid B flows through each second inter-plate space SP2. By circulating, the first fluid A and the second fluid B exchange heat via the heat transfer plates 20 separating the inter-plate spaces SP1 and SP2.

At this time, a part of the second fluid B introduced from the second introduction part 5A into the plate stacking part 2 enters the upstream inter-plate space SPu and the downstream inter-plate space SPd, which are not in direct communication with the second inflow path Pb1. also flow into Specifically, it is as follows.

The second fluid B introduced from the second introduction part 5A into the second inflow path Pb1 flows into each second inter-plate space SP2. At this time, part of the second fluid B flowing from the second inflow path Pb1 into the upstream inter-plate space SPu that also serves as the second inter-plate space SP2 flows through the opening G1 into the other upstream inter-plate space SPu, that is, the second inter-plate space SPu. It flows into the upstream inter-plate space SPu that is not in direct communication with the second inflow passage Pb1. In the plate stacking section 2 of the present embodiment, the second fluid B flows through the opening G1 into the upstream inter-plate space SPu located on the most upstream side in the introduction direction.

At the portions (end portions 27) of the two heat transfer plates 20 that define the region adjacent to the opening G1 in the upstream inter-plate space SPu, a concave portion 27a and a convex portion are formed between the first hole 21 and the second hole 22. 27b extend in the Y-axis direction. Therefore, most of the second fluid B that has flowed into the other upstream inter-plate space SPu through the opening G1 is guided to the first hole 21 side.

Here, the other upstream inter-plate space SPu is in contact with the tip portion (the portion including the tip 410) on the peripheral surface of the first introduction portion 4A. Therefore, the second fluid B guided to the first hole 21 side comes into contact with the tip portion of the peripheral surface of the first introduction portion 4A. Due to this contact, heat exchange is performed between the insertion portion 411 of the first introduction portion 4A and the second fluid B through the tip portion.

In the present embodiment, the first fluid A is high-temperature steam, and the second fluid B is low-temperature water. However, the insertion site 411 is cooled by the contact of the second fluid B.

The second fluid B that has flowed through the other upstream inter-plate space SPu flows out from the opening G1 into the upstream inter-plate space SPu that also serves as the second inter-plate space SP2, and flows through the upstream inter-plate space SPu. After merging with the second fluid B, it flows through the second outflow path Pb2 and is led out of the plate stacking part 2 from the second lead-out part 5B.

Further, part of the second fluid B flowing from the second inflow passage Pb1 into the downstream inter-plate space SPd, which also serves as the second inter-plate space SP2, flows through the opening G2 into the other downstream inter-plate space SPd, that is, the second inter-plate space SPd. It flows into the downstream inter-plate space SPd that is not in direct communication with the inflow path Pb1. In the plate stacking section 2 of the present embodiment, the second fluid B flows through the opening G2 into the downstream inter-plate space SPd located on the most downstream side in the introduction direction.

At the portions (end portions 27) of the two heat transfer plates 20 that define the region adjacent to the opening G2 in the downstream inter-plate space SPd, a concave portion 27a and a convex portion are formed between the third hole 23 and the fourth hole 24. 27b extend in the Y-axis direction. Therefore, most of the second fluid B that has flowed into the other downstream inter-plate space SPd through the opening G2 is guided to the third hole 23 side.

Here, the other downstream inter-plate space SPd is in contact with the peripheral surface of the first closing member 6A. Therefore, the second fluid B guided toward the third hole 23 comes into contact with the peripheral surface of the first closing member 6A. This contact causes heat exchange between the first closing member 6A and the second fluid B through the peripheral surface.

In the present embodiment, the first fluid A is high-temperature steam, and the second fluid B is low-temperature water. Although the closing member 6A is heated by the first fluid A flowing through the first inflow passage Pa1 (that is, before heat exchange), the first closing member 6A is cooled by contact with the second fluid B.

As described above, the second fluid B after cooling the insertion portion 411 of the first introduction portion 4A by flowing through the other upstream inter-plate space SPu and the other downstream inter-plate space SPd are After cooling the first closing member 6A by flowing, the second fluid B flows from the openings G1 and G2 into the upstream inter-plate space SPu, which also serves as the second inter-plate space SP2, or the second inter-plate space SP2. After flowing out into the downstream inter-plate space SPd, which also serves as the second fluid B, flowing through the upstream inter-plate space SPu, or joining the second fluid B flowing through the downstream inter-plate space SPd, the second outflow It flows through the path Pb2 and is led out of the plate stacking part 2 from the second lead-out part 5B.

The heat exchanger 1 of this embodiment includes a plate stacking portion 2 having a plurality of heat transfer plates 20 each having a first hole 21 and stacked in the X-axis direction, and a tip 410 extending along the X-axis direction. a cylindrical first introduction part 4A that is inserted into the plate stacking part 2 and introduces the first fluid A into the plate stacking part 2; a second introduction part 5A that introduces the second fluid B into the plate stacking part 2; Prepare. The plate laminated portion 2 has a plurality of inter-plate spaces SP defined between the heat transfer plates 20, and extends along the X-axis direction by connecting the first holes 21 of the heat transfer plates 20. It has a first inflow path (first communication path) Pa1 that allows the first fluid A introduced by the first introduction part 4A to flow into the first inter-plate space SP1. Further, the tip 410 of the first introduction portion 4A is the hole peripheral portion 210 of the first hole 21 of the heat transfer plate 20 on the upstream side in the introduction direction of the two heat transfer plates 20 defining the first inter-plate space SP1. and is connected to the stacked portion (hole peripheral portion) 210 of the first hole 21 of the heat transfer plate 20 adjacent to the heat transfer plate 20 having the hole peripheral portion 210. . Further, in the upstream inter-plate space SPu, which also serves as the second inter-plate space SP2 that is in contact with the distal end portion including the distal end 410 on the peripheral surface of the first introduction portion 4A among the inter-plate spaces SP, the second fluid B is circulate.

According to this configuration, when the first fluid (steam) A has a higher temperature than the second fluid (water) B as in the present embodiment, the connecting portion between the first introduction portion 4A and the heat transfer plate 20 is Even if heated by the first fluid A, the second fluid B cools the distal end portion of the peripheral surface of the first introduction portion 4A (the portion corresponding to the insertion portion 411). As a result, the temperature rise at the connecting portion between the first introduction portion 4A and the heat transfer plate 20 and the vicinity thereof is suppressed. The occurrence of thermal stress is suppressed. Therefore, even if the process of supplying and stopping the high-temperature first fluid A is repeated, it is possible to prevent thermal fatigue cracks originating from the connection portion and its neighboring portions.

Moreover, in the heat exchanger 1 of the present embodiment, the thickness of the peripheral wall of the first introduction portion 4A is greater than the thickness of the heat transfer plate 20 . Therefore, the heat capacity of the first introduction portion 4A is larger than that of the heat transfer plate 20 to which the first introduction portion 4A is connected. However, even in this case, the tip portion of the peripheral surface of the first introduction portion 4A (the portion corresponding to the insertion portion 411) contacts the second fluid B and is cooled, so that the first introduction portion 4A and the heat transfer plate 20 are cooled. It is possible to effectively suppress the generation of thermal stress at the connection site with and the vicinity thereof.

Further, in the heat exchanger 1 of the present embodiment, the plate stacking portion 2 is upstream in the introduction direction from the first inter-plate space SP1 that communicates with the first inflow passage Pa1 immediately downstream of the tip 410 of the first introduction portion 4A. has a plurality of upstream inter-plate spaces SPu located at . Each of the plurality of upstream inter-plate spaces SPu includes an inter-plate space SP in which the second fluid B is circulated and which is in contact with the distal end portion of the peripheral surface of the first introduction portion 4A. Therefore, the second fluid B also flows through the inter-plate space SP (upstream inter-plate space SPu) adjacent to the inter-plate space SP in contact with the distal end portion of the peripheral surface of the first introduction portion 4A. Therefore, the influence of heat from the first fluid A on the second fluid B flowing through the inter-plate space SP in contact with the tip portion can be suppressed. and the second fluid B flowing through the adjacent inter-plate space SP (upstream inter-plate space SPu) exchange heat, so that even if the first fluid A is affected by the heat, it is in contact with the tip portion A temperature rise of the second fluid B flowing through the inter-plate space SP is suppressed. As a result, the cooling efficiency for the tip portion (the portion corresponding to the insertion portion 411) of the peripheral surface of the first introduction portion 4A is improved.

Moreover, in the heat exchanger 1 of the present embodiment, in the plate stacking portion 2, the plate-to-plate space SP (upstream-side plate-to-plate space SPu) in contact with the tip end portion of the first introduction portion 4A and the second space SPu in which the first fluid A flows Since the upstream inter-plate space SPu in which the second fluid B flows is arranged between the one inter-plate space SP1, the first inter-plate space for the second fluid B flowing in the inter-plate space SP in contact with the tip portion The influence of heat from the first fluid A flowing through SP1 is sufficiently suppressed.

Further, in the heat exchanger 1 of the present embodiment, at least one of the two heat transfer plates 20 defining the upstream inter-plate space SPu has an opening G1 through which the second fluid B can pass. (or constitutes the opening G1). Therefore, in the heat exchanger 1 of the present embodiment, from the upstream inter-plate space SPu defined by the heat transfer plates 20 having (or forming) the openings G1 and the inter-plate space SP adjacent to the upstream plate A second fluid B can flow into the interspace SPu.

Moreover, in the heat exchanger 1 of the present embodiment, each of the plurality of heat transfer plates 20 has the second hole 22 . The second introduction part 5A has a tubular shape, and the tip 510 is inserted into the plate stacking part 2 from the first introduction part 4A side along the X-axis direction. The plate stacking portion 2 extends along the X-axis direction by connecting the second holes 22 of the heat transfer plates 20 to each other, and the second fluid B introduced by the second introducing portion 5A is introduced into the second inter-plate space. It has a second inflow passage (second communication passage) Pb1 for flowing into SP2. In this plate stacking portion 2, the second inter-plate space SP2 communicating with the second inflow passage Pb1 immediately downstream of the tip 510 of the second introduction portion 5A is the first inflow space SP2 immediately downstream of the tip 410 of the first introduction portion 4A. It is located upstream in the introduction direction with respect to the first inter-plate space SP1 communicating with the path Pa1, and is included in a plurality of upstream inter-plate spaces SPu. The inter-plate spaces SP other than the second inter-plate spaces SP2 communicating with the second inflow paths Pb1 in the plurality of upstream inter-plate spaces SPu are the second inter-plate spaces SP2 communicating with the second inflow paths Pb1 and the openings. It communicates through G1. For this reason, in the plate stacking portion 2, the second inter-plate space communicating with the second inflow path Pb1 also extends to the upstream inter-plate space SPu located upstream in the introduction direction from the tip 510 of the second introduction portion 5A. A second fluid B is supplied via SP2.

Further, in the heat exchanger 1 of the present embodiment, the peripheral wall thickness of the portion (insertion portion 411) including the tip 410 in the first introduction portion 4A is smaller than the peripheral wall thickness of other portions in the introduction direction. In this way, by making the thickness of the peripheral wall of the portion of the first introduction portion 4A connected to the heat transfer plate 20 smaller than the thickness of the peripheral wall of other portions, the portion including the tip 410 of the first introduction portion 4A (insertion portion) 411) is suppressed. This improves the cooling effect of the insertion portion 411 by the second fluid B, and as a result, the generation of thermal stress at the connection portion between the first introduction portion 4A and the heat transfer plate 20 can be suppressed more reliably.

Further, in the heat exchanger 1 of the present embodiment, the first introduction portion 4A has flange portions (flange-shaped portions) 42 and 43 at the distal end portion of the peripheral surface of the first introduction portion 4A. Since these flange portions 42 and 43 are located in the plate-to-plate space SP (upstream plate-to-plate space SPu) through which the second fluid B circulates, the tip portion of the first introduction portion 4A is cooled by the second fluid B. area (surface area) increases. As a result, the cooling efficiency of the tip portion of the first introduction portion 4A by the second fluid B is improved. As a result, the temperature rise at the connecting portion between the first introduction portion 4A and the heat transfer plate 20 and the vicinity thereof can be suppressed more effectively.

Moreover, in the heat exchanger 1 of the present embodiment, the flange portion 42 includes the tip 410 of the first introduction portion 4A and is connected to the hole peripheral portion 210 of the first hole 21 of the heat transfer plate 20 . Therefore, the contact area between the first introduction portion 4A and the heat transfer plate 20 increases, and as a result, the connection strength between the first introduction portion 4A and the heat transfer plate 20 can be sufficiently secured. That is, with such a configuration, it is possible to both improve the cooling effect at the connecting portion between the first introduction portion 4A and the heat transfer plate 20 and secure the connection strength between the first introduction portion 4A and the heat transfer plate 20. can.

In addition, the heat exchanger 1 of the present embodiment seals the first hole 21 in a state in which the heat transfer plate 20 on the most downstream side among the plurality of heat transfer plates 20 in the introduction direction is inserted into the first hole 21. It has a first closing member 6A that stops. The end of the peripheral edge of the first closing member 6A on the side of the first introduction portion 4A is the first end of the heat transfer plate 20 on the downstream side in the introduction direction of the two heat transfer plates 20 that define the first inter-plate space SP1. A stacked portion (hole peripheral portion) 210 that overlaps the hole peripheral portion 210 of one hole 21 and is connected to the stacked portion (hole peripheral portion) 210 of the heat transfer plate 20 adjacent to the heat transfer plate 20 having the hole peripheral portion 210 . It is Then, the second fluid B flows through the inter-plate space SP, which is in contact with the portion including the end of the peripheral surface of the insertion portion (the third main body 61A) of the first closing member 6A among the plurality of inter-plate spaces SP. there is Therefore, when the first fluid A has a higher temperature than the second fluid B, even if the connecting portion between the first closing member 6A and the heat transfer plate 20 is heated by the first fluid A, the first closing member 6A The second fluid B cools a portion including the end on the peripheral surface of the insertion portion (third main body 61A). As a result, the temperature rise at the connecting portion between the first closing member 6A and the heat transfer plate 20 and the vicinity thereof is suppressed. The generation of thermal stress is suppressed. Therefore, even if the process of supplying and stopping the high-temperature first fluid A is repeated, it is possible to prevent thermal fatigue cracks originating from the connection portion and its neighboring portions.

It should be noted that the plate heat exchanger of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and part of the configuration of one embodiment can be replaced with the configuration of another embodiment. Furthermore, some of the configurations of certain embodiments can be deleted.

In the heat exchanger 1 of the above embodiment, in the plate stacking portion 2, the inter-plate space SP in contact with the distal end portion (the portion corresponding to the insertion portion 411) including the distal end 410 on the peripheral surface of the first introduction portion 4A is one. Although formed (defined), it is not limited to this configuration. In the plate stacking portion 2, a plurality of inter-plate spaces SP may be formed in contact with the distal end portion of the peripheral surface of the first introduction portion 4A. In this case, the plurality of inter-plate spaces SP in contact with the distal end portion of the peripheral surface of the first introduction portion 4A may be arranged so as to be continuously arranged in the introduction direction, or may be arranged at intervals in the introduction direction. good.

Further, the plate stacking portion 2 may have only one upstream inter-plate space SPu. In this case, the upstream inter-plate space SPu also serves as the second inter-plate space SP2. A configuration in which heat is exchanged with the second fluid B flowing in the upstream inter-plate space SPu may be employed.

Further, in the heat exchanger 1 of the above embodiment, the direction in which the first introduction portion 4A introduces the first fluid A into the plate stacking portion 2 and the direction in which the second introduction portion 5A introduces the second fluid B into the plate stacking portion 2 Although the orientation is the same as the orientation, it is not limited to this configuration. The direction in which the first introduction part 4A introduces the first fluid A into the plate stacking part 2 and the direction in which the second introduction part 5A introduces the second fluid B into the plate stacking part 2 may be opposite directions. . That is, the first introduction portion 4A introduces the first fluid A from one side of the plate stacking portion 2 in the X-axis direction, and the second introduction portion 5A introduces the first fluid A from the other side of the plate stacking portion 2 in the X-axis direction. A configuration in which the second fluid B is introduced may be used.

Further, in the heat exchanger 1 of the above-described embodiment, in the plate laminated portion 2, the first introduction portion 4A and the first The end opposite to the side where the lead-out portion 4B, the second lead-in portion 5A, and the second lead-out portion 5B are arranged is sealed by the first closing member 6A or the second closing member 6B. Not limited to configuration. In the plate laminated portion 2, the heat transfer plates arranged at the opposite ends of the first inflow passage Pa1, the first outflow passage Pa2, the second inflow passage Pb1, and the second outflow passage Pb2 are the same as those of the first embodiment described above. A configuration without holes corresponding to the first hole 21, the second hole 22, the third hole 23, and the fourth hole 24 is also possible. That is, the plate laminated portion 2 may be configured without the first closing member 6A and the second closing member 6B.

Further, in the heat exchanger 1 of the above-described embodiment, the first introduction portion 4A and the second introduction portion 5A are arranged in the longitudinal direction of the rectangular plate laminated portion 2 elongated in the Z-axis direction when viewed from the X-axis direction. Although they are arranged at the ends on the same side (in the Z-axis direction), they are not limited to this configuration. The first introduction portion 4A may be arranged at one end portion of the plate laminated portion 2 in the longitudinal direction, and the second introduction portion 5A may be arranged at the other end portion of the plate laminated portion 2 in the longitudinal direction.

Further, in the heat exchanger 1 of the above-described embodiment, in the plate stacking portion 2, the space SP between the plates in which the second fluid B flows is divided into the tip portion on the peripheral surface of the first introduction portion 4A and the periphery of the first outlet portion 4B. It is configured to be in contact with each of the tip portions on the surface, that is, both connection portions of the connection portion between the first introduction portion 4A and the heat transfer plate 20 and the connection portion between the first lead-out portion 4B and the heat transfer plate 20 are the first. Although it is a configuration that can be cooled by two fluids B, it is not limited to this configuration. The plate stacking portion 2 may have a structure capable of cooling at least the connecting portion between the first introduction portion 4A and the heat transfer plate 20 .

Further, in the heat exchanger 1 of the above-described embodiment, in the plate laminated portion 2, the spaces between the reinforcing plates 3A and 3B and the heat transfer plates 20 adjacent to the reinforcing plates 3A and 3B are filled with the fluids A and B. Although it does not constitute a flow channel, it is not limited to this configuration. For example, a space defined by the reinforcing plates 3A, 3B and the heat transfer plate 20 adjacent to the reinforcing plates 3A, 3B constitutes an inter-plate space SP, and fluids A and B flow through the inter-plate space SP. (See FIG. 9). According to this configuration, the plates (reinforcing plates) 3A and 3B for ensuring the strength of the heat exchanger 1 and the space ( Heat exchange between the fluids A and B and cooling of the insertion part 411 of the first introduction part 4A can be performed by using the inter-plate space) SP. In this case, it is preferable that the reinforcing plates 3A and 3B overlap the heat transfer plate 20 so as to cover the heat transfer portion 25 entirely. In the example shown in FIG. 9, the inter-plate space SP defined by the reinforcing plate 3A and the heat transfer plate 20 is the upstream inter-plate space SPu that also serves as the second inter-plate space SP2. It is in contact with the tip portion of the peripheral surface of 4A.

Further, as shown in FIG. 10, the plate laminated portion 2 may be configured without the reinforcing plates 3A and 3B. That is, the plate laminated portion 2 may be composed only of a plurality of heat transfer plates 20 that are superimposed.

In addition, in the heat exchanger 1 of the above-described embodiment, all of the inter-plate spaces SP of the plate stack 2 are used as flow paths for the fluids A and B, but the configuration is not limited to this. In the plate stacking portion 2, at least one inter-plate space SP0 of the plurality of inter-plate spaces SP may be configured so that the fluids A and B do not flow (see FIG. 10).

Further, in the heat exchanger 1 of the above-described embodiment, in the plate laminated portion 2, one of the plurality of upstream inter-plate spaces SPu, one of the upstream inter-plate spaces SPu, is divided into the second inflow path Pb1 and the second outflow path Pb2. , that is, there is only one upstream inter-plate space SPu that also serves as the second inter-plate space SP2, but the configuration is not limited to this. The plurality of upstream inter-plate spaces SPu may include a plurality of upstream inter-plate spaces SPu that also serve as the second inter-plate spaces SP2. In this case, the plurality of upstream inter-plate spaces SPu that also serve as the second inter-plate spaces SP2 may be arranged continuously in the introduction direction, and other upstream inter-plate spaces (the second inflow path Pb1 and the second They may be intermittently arranged in the introduction direction so as to sandwich the upstream inter-plate space SPu that does not directly communicate with the outflow path Pb2. In addition, the number of the plurality of upstream side plate side spaces SPu is smaller than or equal to the number of the upstream side inter-plate spaces SPu that also serve as the second inter-plate spaces SP2.

Further, in the first introduction portion 4A in the heat exchanger 1 of the above embodiment, the inner diameter of the insertion portion 411 gradually increases toward the tip 410, but the configuration is not limited to this. The inner diameter at each position in the X-axis direction in the first introduction portion 4A may be the same. In addition, in the first introduction portion 4A of the above embodiment, the thickness of the insertion portion 411 is smaller than the thickness of other portions, but the configuration is not limited to this. The thickness at each position in the X-axis direction of the first introduction portion 4A may be the same.

In the heat exchanger 1 of the above embodiment, the openings G1 for allowing the plurality of upstream inter-plate spaces SPu to communicate with each other so that the second fluid B can flow, that is, the two transmissions defining the upstream inter-plate spaces SPu. The opening G1 provided in at least one of the heat transfer plates 20 of the heat transfer plate 20 is such that the hole periphery of the large diameter holes 22A and 24A of the heat transfer plate 20 is aligned with the tip 510 (specifically, the tip) of the second introduction portion 5A. 510 is formed by providing a gap between it and the heat transfer plate 20 or the hole peripheral portion 220) to which it is connected, but it is not limited to this configuration.

For example, as shown in FIG. 11, the opening G1 is formed in the heat transfer plate adjacent to the upstream inter-plate space SPu (that is, one of the two heat transfer plates 20 defining the upstream inter-plate space SPu). At the end 27 of the heat transfer plate) 20, a hole (more specifically, in the X-axis direction through holes).

The specific shape and size of the hole (opening G1) provided in at least one of the first hole 21 and the second hole 22 and between the third hole 23 and the fourth hole 24 of the end 27 No, the number is not limited. For example, the opening G1 may be configured by a rectangular hole 270 as shown in FIG.

Further, when the plate-to-plate space SP defined between the reinforcing plate 3A and the heat transfer plate 20 adjacent to the reinforcing plate 3A is the upstream-side plate-to-plate space SPu, the second fluid B is placed in the upstream-side plate-to-plate space SPu. An opening G1 for flowing into or out of SPu may be arranged in the reinforcing plate 3A. In this case, the second fluid B is directly supplied to the upstream inter-plate space SPu from the outside of the plate stacking portion 2 through the opening G1 arranged in the reinforcing plate 3A, or discharged directly from the upstream inter-plate space SPu.

The specific shape of the connecting portions of the first introduction portion 4A and the first closing member 6A to the hole peripheral portion 210 of the heat transfer plate 20 is not limited.

For example, the connecting portions of the first introduction portion 4A and the first closing member 6A of the above embodiment with the heat transfer plate 20 are configured by two flange portions 42, 43, 62A, and 63A. 43, 62A, and 63A are sandwiched between the two hole peripheral edge portions 210 that face each other with a gap in the X-axis direction, thereby connecting the first introducing portion 4A and the first closing member 6A and the heat transfer plate 20 to each other. However, the first introduction portion 4A and the first closing member 6A have a flange portion 42A with a thickness (dimension in the X-axis direction) corresponding to the distance between the two hole peripheral portions 210 facing each other in the X-axis direction. The flange portion 42A may be connected so as to be sandwiched between the two hole peripheral portions 210 (see FIG. 10).

Further, for example, as shown in FIG. 9 , the first introduction portion 4A and the heat transfer plate 20 may be connected so that the tip surface of the first introduction portion 4A abuts the hole peripheral portion 210 .

Further, for example, as shown in FIG. 9, in the first introduction portion 4A, the tip portion 412 and the other portion 413 are made of different members, and the tip portion 412 and the other portion 413 are integrated by brazing or the like. It may have been

The size of the inlet of the upstream inter-plate space SPu (in the example shown in FIG. 9, in the X-axis direction size), more specifically, the interval between the hole peripheral portions 210 of the two heat transfer plates 20 defining the upstream inter-plate space SPu, or the reinforcing plates 3A and 3B defining the upstream inter-plate space SPu and the hole peripheral portion 210 of the heat transfer plate 20 may be the same or different for each upstream inter-plate space SPu.

Further, in the heat exchanger 1 of the above-described embodiment, the tip 410 of the first introduction portion 4A is the upstream heat transfer plate 20 in the introduction direction of the two heat transfer plates 20 defining the first inter-plate space SP1. Laminated portion (hole peripheral portion) 210 overlapping with the hole peripheral portion 210 of the first hole 21 of the first hole 21 of the heat transfer plate 20 adjacent to the heat transfer plate 20 having the hole peripheral portion 210 ( 210, that is, the tip 410 of the first introduction portion 4A is connected to the overlapping hole peripheral portion 210, but the configuration is not limited to this. The tip 410 of the first introduction portion 4A may be connected to a single hole peripheral edge portion 210 (that is, the hole peripheral edge portion 210 in a state where the other hole peripheral edge portions 210 do not overlap).

Further, in the heat exchanger 1 of the above embodiment, the flange portions 42 and 43 arranged at the distal end portion of the peripheral surface of the first introduction portion 4A are used for connection with the heat transfer plate 20, but this configuration is not limited to The flange-like portion arranged at the tip portion of the peripheral surface of the first introduction portion 4A may be separated from the heat transfer plate 20 as long as it is positioned within the inter-plate space SP where the second fluid B flows. According to this configuration, the area (surface area) of the portion cooled by the second fluid B at the tip portion of the first introduction portion 4A is increased, and the cooling efficiency of the portion by the second fluid B is improved. As a result, the temperature rise at the connecting portion between the first introduction portion 4A and the heat transfer plate 20 and the vicinity thereof can be suppressed more effectively.

DESCRIPTION OF SYMBOLS 1... Plate type heat exchanger, 2... Plate lamination part, 20, 20A... Heat-transfer plate, 21... First hole, 210... Hole peripheral part, 22... Second hole, 220... Hole peripheral part, 23... Third Hole 230... Hole peripheral part 24... Fourth hole 240... Hole peripheral part 22A, 24A... Large diameter hole 25... Heat transfer part 26... Main heat transfer part 27... End part 270... Hole ( Opening), 28 Weir portion 25a, 26a, 27a, 28a Concave portion 25b, 26b, 27b, 28b Convex portion 29 Fitting portion 3A First reinforcing plate (reinforcing plate) 31A, 32A , 33A, 34A... Hole 3B... Second reinforcing plate (reinforcing plate) 31B, 32B, 33B, 34B... Hole 4A... First introduction part 4B... First lead-out part 41... First main body 410... Tip 411... Insertion part 412... Tip part 413... Other part 42, 42A, 43, 45... Flange part 5A... Second introduction part 5B... Second lead-out part 51... Second main body 510 Tip 511 Insertion site 52 Flange 6A First closing member 61A Third main body 62A, 63A Flange 6B Second closing member 61B Fourth main body 62B Flange , 100... Plate type heat exchanger, 101... Heat transfer plate, 102... Frame plate, 103... Body part, 104... First introduction part, 105... Second introduction part, 106... First flow path, 107... Second flow Path 108... First communicating path 109... Second communicating path 110... Periphery of hole A... First fluid (fluid) B... Second fluid (fluid) CL1... Vertical center line CL2... Horizontal center Lines, G1, G2... opening, Pa1... first inflow path (first communication path), Pa2... first outflow path, Pb1... second inflow path (second communication path), Pb2... second outflow path, S1... First surface, S2... Second surface, SP, SP0... Space between plates, SP1... Space between first plates (space between plates), SP2... Space between second plates (space between plates), SPd... Between downstream plates Space (space between plates), SPu: space between upstream plates

Claims (10)

a plate stacking unit having a plurality of heat transfer plates each having a first hole and stacked in a predetermined direction;
a tubular first introduction part whose tip end is inserted into the plate stacking part along the predetermined direction and introduces the first fluid into the plate stacking part;
a second introduction section for introducing a second fluid into the plate stacking section;
The plate laminate portion has a plurality of inter-plate spaces defined between the heat transfer plates, and extends along the predetermined direction by connecting the first holes of the heat transfer plates to the first introducing portion. having a first passage that allows the first fluid introduced by to flow into a first inter-plate space that is a predetermined inter-plate space among the plurality of inter-plate spaces;
The tip of the first introduction part is the first hole of the heat transfer plate on the upstream side in the direction in which the first fluid is introduced by the first introduction part of the two heat transfer plates defining the space between the first plates. or a hole peripheral edge overlapping the hole peripheral edge of the first hole of the upstream heat transfer plate, and the heat transfer plate adjacent to the upstream heat transfer plate Connected to the lamination part which is the hole peripheral part of the first hole,
The plate-type heat exchanger, wherein the second fluid flows in an inter-plate space that is in contact with a distal end portion including the distal end of the peripheral surface of the first introduction portion among the inter-plate spaces. 2. The plate heat exchanger according to claim 1, wherein the thickness of the peripheral wall of said first introduction portion is greater than the thickness of said heat transfer plate. The plate stacking portion is an upstream plate that is an inter-plate space located upstream in the introduction direction from the first inter-plate space communicating with the first communication passage immediately downstream of the tip of the first introduction portion. having a plurality of interspaces,
3. The plate heat exchanger according to claim 1, wherein each of said plurality of upstream inter-plate spaces includes an inter-plate space in which said second fluid is circulated and which is in contact with said tip portion of said first introduction portion. The plate stacking portion has a reinforcing plate that is superimposed on the upstream side of the plurality of heat transfer plates in the introducing direction and is thicker than the heat transfer plates,
4. The plate heat exchanger of claim 3, wherein the plurality of inter-plate spaces includes spaces defined between the reinforcing plates and the heat transfer plates adjacent to the reinforcing plates. At least one of the two heat transfer plates that define the upstream inter-plate space, or at least one of the reinforcing plate and the heat transfer plate that define the upstream inter-plate space, the second fluid is 5. A plate heat exchanger according to claim 4, having passageable openings. each of the plurality of heat transfer plates has a second hole,
The second introduction part is cylindrical, and the tip is inserted into the plate stacking part from the first introduction part side along the predetermined direction,
The plate stacking portion extends along the predetermined direction by connecting the second holes of the heat transfer plates to each other, and the second fluid introduced by the second introduction portion is introduced into the spaces between the plurality of plates. Having a second communication path for flowing into a second inter-plate space that is a different inter-plate space from the first inter-plate space,
The second inter-plate space communicating with the second communication passage immediately downstream of the tip of the second introducing portion communicates with the first communication passage immediately downstream of the tip of the first introducing portion. positioned upstream in the introduction direction with respect to the inter-plate space and included in the plurality of upstream inter-plate spaces;
The upstream inter-plate space other than the second inter-plate space that communicates with the second communication passage immediately downstream of the tip of the second introduction part in the plurality of upstream inter-plate spaces is the tip of the second introduction part 6. The plate heat exchanger according to claim 5, which communicates through said opening with a second inter-plate space that communicates with a second communication passage immediately downstream of said opening. The plate heat exchanger according to any one of claims 1 to 6, wherein the thickness of the peripheral wall of the portion including the tip of the first introduction portion is smaller than the thickness of the peripheral wall of other portions in the introduction direction. . The plate-type heat exchanger according to any one of claims 1 to 7, wherein said first introducing portion has a flange-like portion at said tip portion on the peripheral surface of said first introducing portion. The flange-shaped portion includes the tip of the first introduction portion and is an upstream heat transfer plate in the introduction direction of the first fluid, of the two heat transfer plates defining the first inter-plate space. 9. The plate heat exchanger according to claim 8, which is connected to the hole periphery of the first hole of or the lamination portion overlapping with the hole periphery. a closing member that seals the first hole in a state of being inserted into the first hole of the most downstream heat transfer plate in the most downstream heat transfer plate among the plurality of heat transfer plates in the introduction direction prepared,
The end of the peripheral edge portion of the closing member on the side of the first introduction portion is the hole peripheral edge of the first hole of the heat transfer plate on the downstream side in the introduction direction of the two heat transfer plates defining the first inter-plate space. or a stacking portion that is a hole peripheral edge overlapping with the hole peripheral edge of the first hole of the downstream heat transfer plate, the downstream heat transfer plate having the hole peripheral edge of the first hole Connected to the lamination portion which is the hole peripheral portion of the first hole of the adjacent heat transfer plate,
10. The second fluid circulates in an inter-plate space, of the plurality of inter-plate spaces, which is in contact with a portion including the end of the peripheral surface of the insertion portion of the closing member. A plate heat exchanger as described.

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