WO2025191963A1 - Heat exchanger - Google Patents

Abstract

A heat exchanger 1 according to the present invention comprises: a stacked heat exchanger 2 having a stacked part 21 in which a plurality of plates 20 are stacked, with a first low-temperature fluid space into which a first low-temperature fluid L1 is introduced and a high-temperature fluid space into which a high-temperature fluid H is introduced being formed between the plurality of plates 20, and at least a part of the high-temperature fluid space being open to the periphery of the stacked part 21; and a case 3 in which a case internal space IS communicating with at least a part of the high-temperature fluid space is formed between the stacked part 21 and an inner wall part 30, and a second low-temperature fluid space LS2 into which a second low-temperature fluid L2 is introduced is formed between the inner wall part 30 and an outer wall part 31, wherein the first low-temperature fluid L1 in the first low-temperature fluid space and the high-temperature fluid H in the high-temperature fluid space exchange heat with each other, and the high-temperature fluid H in the case internal space IS and the second low-temperature fluid L2 in the second low-temperature fluid space LS2 exchange heat with each other.

Description

heat exchanger

The present invention relates to a heat exchanger that performs heat exchange between fluids.

An example of a conventional heat exchanger of this type is the configuration shown in Patent Document 1 below. Patent Document 1 describes a stacked heat exchanger in which multiple sets of core plates are stacked between front and rear end plates, and their outer flanges are brazed to each other to form an alternating stack of high-temperature fluid chambers, through which high-temperature fluid flows, and low-temperature fluid chambers, through which low-temperature fluid flows, enclosed by the end plates and core plates. High-temperature fluid inlet channels for introducing high-temperature fluid into each high-temperature fluid chamber, high-temperature fluid outlet channels for discharging high-temperature fluid from each high-temperature fluid chamber, low-temperature fluid inlet channels for introducing low-temperature fluid into each low-temperature fluid chamber, and low-temperature fluid outlet channels for discharging low-temperature fluid from each low-temperature fluid chamber are each formed to penetrate the front end plate and each core plate in the stacking direction, and each of these channels is connected to a pair of circulation pipes protruding from the front end plate.

Japanese Patent Application Laid-Open No. 2007-240081

Although conventional heat exchangers such as those described above can exchange heat between low-temperature fluids and high-temperature fluids, they do not take into consideration heat exchange between two types of low-temperature fluids and a high-temperature fluid. When attempting to exchange heat between two types of low-temperature fluids and a high-temperature fluid using such conventional heat exchangers, the two types of low-temperature fluids must be mixed before being introduced into the heat exchanger, and depending on the type of low-temperature fluid, problems such as the formation of condensation may occur during pre-mixing.

The present invention was made to solve the above-mentioned problems, and one of its objectives is to provide a heat exchanger that can individually exchange heat between two types of low-temperature fluid and a high-temperature fluid, thereby reducing the need to pre-mix the two types of low-temperature fluid.

Item 1. In one embodiment, the present invention relates to a heat exchanger comprising: a stacked heat exchanger having a stacked portion in which a plurality of plates are stacked; a first cold fluid space into which a first cold fluid is introduced and a hot fluid space into which a hot fluid is introduced, formed between the plurality of plates; and at least a portion of the hot fluid space being open to the periphery of the stacked portion; and a case having an inner wall portion and an outer wall portion provided outside the inner wall portion, the stacked portion being disposed inside the inner wall portion; a case internal space communicating with at least a portion of the hot fluid space being formed between the stacked portion and the inner wall portion; and a second cold fluid space into which a second cold fluid is introduced being formed between the inner wall portion and the outer wall portion, wherein heat exchange occurs between the first cold fluid in the first cold fluid space and the hot fluid in the hot fluid space, and between the hot fluid in the case internal space and the second cold fluid in the second cold fluid space.

Item 2. The present invention may relate to the heat exchanger described in Item 1, wherein the case or the stacked heat exchanger is provided with a discharge passage that communicates with the case internal space, and is configured so that condensate produced by cooling the high-temperature fluid can be discharged from the case internal space through the discharge passage.

Item 3. The present invention may relate to the heat exchanger described in Item 1 or 2, wherein each of the plurality of plates has a surface portion extending in a first direction and a second direction perpendicular to the plate thickness direction, and the surface portion is provided with a plurality of hollow protrusions arranged at a distance from each other in the first direction and the second direction.

Item 4. The present invention may relate to the heat exchanger described in any one of Items 1 to 3, wherein each of the plurality of plates has a surface portion extending in a first direction and a second direction perpendicular to the plate thickness direction, and the surface portion is provided with an inlet portion for introducing the first low-temperature fluid or the high-temperature fluid into the first low-temperature fluid space or the high-temperature fluid space, an outlet portion that is positioned away from the inlet portion in the first direction and the second direction and for discharging the first low-temperature fluid or the high-temperature fluid from the first low-temperature fluid space or the high-temperature fluid space, and a plurality of guide walls that form a detour between the inlet portion and the outlet portion, along which the first low-temperature fluid or the high-temperature fluid from the inlet portion detours in the first direction and/or the second direction and heads toward the outlet portion.

Item 5. The present invention may relate to the heat exchanger described in Item 4, wherein the first spacing between the plurality of guide wall portions is wider than the second spacing between the stack portion and the inner wall portion.

Item 6. The present invention may relate to the heat exchanger described in any one of Items 1 to 5, wherein the gap between the lower surface of the stack and the inner wall is wider than the gap between the upper surface of the stack and the inner wall.

Item 7. The present invention may relate to the heat exchanger described in any one of Items 1 to 4, wherein the stacked heat exchanger further includes a holding plate provided at one end of the stacked portion in the stacking direction of the plurality of plates and fixed to the case, and the other end of the stacked portion in the stacking direction is a free end within the internal space of the case.

Item 8. The present invention may relate to the heat exchanger described in any one of Items 1 to 7, wherein the plurality of plates include a first plate and a second plate, each of which has a first surface portion and a second surface portion extending in a first direction and a second direction perpendicular to the plate thickness direction, the first low-temperature fluid space being provided between the surface of the first surface portion and the back surface of the second surface portion, and the high-temperature fluid space being provided between the surface of the second surface portion and the back surface of the first surface portion, and the first surface portion is provided with an annular outer peripheral wall portion extending from the outer edge of the first surface portion in the plate thickness direction and joined to the back surface of the second surface portion so that the first low-temperature fluid space is closed around the stack, and at least a portion of the second surface portion is not provided with or is partially provided with an annular outer peripheral wall portion extending from the outer edge of the second surface portion in the plate thickness direction and joined to the back surface of the first surface portion so that at least a portion of the high-temperature fluid space is open around the stack.

Item 9. The present invention may relate to the heat exchanger described in any one of Items 1 to 8, further comprising an insulating case covering the outer periphery of the case.

Item 10. The present invention may relate to the heat exchanger described in any one of items 1 to 9, wherein the temperature of the second cryogenic fluid is lower than the temperature of the first cryogenic fluid.

In one embodiment of the heat exchanger of the present invention, the first cryogenic fluid in the first cryogenic fluid space and the high-temperature fluid in the high-temperature fluid space are heat exchanged, and the high-temperature fluid in the case internal space and the second cryogenic fluid in the second cryogenic fluid space are heat exchanged. This allows the two types of cryogenic fluid to exchange heat with the high-temperature fluid individually, reducing the need to pre-mix the two types of cryogenic fluid.

1 is an exploded perspective view showing a heat exchanger according to a first embodiment of the present invention; FIG. 2 is a front view showing the stacked heat exchanger of FIG. 1. FIG. 3 is a plan view showing the stacked heat exchanger of FIG. 2. FIG. 3 is a right side view showing the stacked heat exchanger of FIG. 2 . FIG. 5 is an exploded perspective view of the stacked portion of FIG. 4 . FIG. 10 is a plan view showing a plate of a heat exchanger according to a second embodiment of the present invention. FIG. 7 is a perspective view showing the hollow protrusion of FIG. 6 . 8 is a cross-sectional view of the hollow protrusion taken along line AA in FIG. 7.

The following describes embodiments of the present invention with reference to the drawings. The present invention is not limited to each embodiment, and the components can be modified and embodied without departing from the spirit of the invention. Furthermore, various inventions can be created by appropriately combining multiple components disclosed in each embodiment. For example, some components may be deleted from all of the components shown in the embodiments. Furthermore, components from different embodiments may be combined as appropriate.

Embodiment 1.
FIG. 1 is an exploded perspective view of a heat exchanger 1 according to embodiment 1 of the present invention, FIG. 2 is a front view of the stacked heat exchanger 2 of FIG. 1, FIG. 3 is a plan view of the stacked heat exchanger 2 of FIG. 2, and FIG. 4 is a right side view of the stacked heat exchanger 2 of FIG. 2.

The heat exchanger 1 in Figure 1 is a device for exchanging heat between a first low-temperature fluid L1 and a second low-temperature fluid L2 and a high-temperature fluid H. The first low-temperature fluid L1, the second low-temperature fluid L2, and the high-temperature fluid H may be either a gas or a liquid. The first low-temperature fluid L1 and the second low-temperature fluid L2 may be different fluids from each other. The high-temperature fluid H may be a different type of fluid from the first low-temperature fluid L1 and the second low-temperature fluid L2, or may be the same fluid as at least one of the first low-temperature fluid L1 and the second low-temperature fluid L2. The high-temperature fluid H may be a fluid obtained by mixing and reacting the first low-temperature fluid L1 and the second low-temperature fluid L2. In this case, the first low-temperature fluid L1 and the second low-temperature fluid L2 may be called raw material fluids, and the high-temperature fluid H may be called a reaction fluid. The reaction between the first low-temperature fluid L1 and the second low-temperature fluid L2 may be an exothermic reaction. The first low-temperature fluid L1, the second low-temperature fluid L2, and the high-temperature fluid H may contain a fluid (e.g., superheated steam) that produces condensate when its temperature is reduced.

As shown in Figure 1, the heat exchanger 1 of this embodiment has a stacked heat exchanger 2 and a case 3.

As shown in Figures 1, 3, and 4, the stacked heat exchanger 2 has a stacked section 21 in which multiple plates 20 are stacked. Between the multiple plates 20, a first low-temperature fluid space LS1 (see Figure 5 below) into which a first low-temperature fluid L1 is introduced, and a high-temperature fluid space HS (see Figure 5 below) into which a high-temperature fluid H is introduced are formed. In this embodiment, at least a portion of the high-temperature fluid space HS is open to the surroundings of the stacked section 21. That is, the high-temperature fluid H can escape from at least a portion of the high-temperature fluid space HS to the surroundings of the stacked section 21. How the first low-temperature fluid space LS1 and the high-temperature fluid space HS are formed, and how at least a portion of the high-temperature fluid space HS is open to the surroundings of the stacked section 21 will be explained in more detail later using figures.

The periphery of the stacking section 21 may be a space where the upper surface 21a, lower surface 21b, and side surface 21c of the stacking section 21 shown in Figures 3 and 4 are in contact. All of the high-temperature fluid spaces HS may be open to the periphery of the stacking section 21, or only some of the high-temperature fluid spaces HS may be open to the periphery of the stacking section 21. The first low-temperature fluid space LS1 may be closed to the periphery of the stacking section 21. The first low-temperature fluid space LS1 and the high-temperature fluid space HS may be arranged alternately in the stacking direction LD of the multiple plates 20, or may be arranged non-alternately according to a predetermined order. An example of an order in which the first low-temperature fluid space LS1 and the high-temperature fluid space HS are arranged non-alternately is the first low-temperature fluid space LS1, first low-temperature fluid space LS1, high-temperature fluid space HS, and high-temperature fluid space HS.

The case 3 has an inner wall portion 30 and an outer wall portion 31 provided on the outside of the inner wall portion 30. The stack portion 21 of the stack-type heat exchanger 2 is arranged inside the inner wall portion 30. A case internal space IS is formed between the stack portion 21 and the inner wall portion 30, and communicates with at least a portion of the high-temperature fluid space HS. A second low-temperature fluid space LS2 is formed between the inner wall portion 30 and the outer wall portion 31, into which a second low-temperature fluid L2 is introduced.

The case 3 may be formed of a double case, with the inner wall portion 30 formed by the inner case and the outer wall portion 31 formed by the outer case. In this case, a second cryogenic fluid space LS2 may be formed between the inner case and the outer case. Alternatively, the case 3 may be formed of a relatively thick wall, with the inner wall portion 30 formed by the inner wall surface of the thick wall and the outer wall portion 31 formed by the outer wall surface of the thick wall. In this case, a second cryogenic fluid space LS2 may be formed inside the thick wall.

The inner wall portion 30 surrounds the case internal space IS and may have inner wall surfaces facing the upper surface 21a, lower surface 21b, and side surface 21c of the stack portion 21. The inner wall portion 30 may have an insertion opening 30a for inserting the stack portion 21 into the case internal space IS. The outer wall portion 31 may be located outside the retaining plate 22 of the stacked heat exchanger 2 described below. While FIG. 1 shows the second cryogenic fluid space LS2 as open on the insertion opening 30a side, an annular flange (not shown) connecting the tip of the inner wall portion 30 to the tip of the outer wall portion 31 on the insertion opening 30a side may be provided, and the second cryogenic fluid space LS2 may be closed (enclosed) by the inner wall portion 30, outer wall portion 31, and flange. Note that the outer wall portion 31 may close the second cryogenic fluid space LS2 on the opposite side from the insertion opening 30a (the far right side of FIG. 1).

If one of the first and second cryogenic fluids L1 and L2 is hotter than the other and produces condensate as its temperature drops, and the first and second cryogenic fluids L1 and L2 must be mixed before being introduced into the heat exchanger 1, a drop in the temperature of one of them could produce condensate. Condensate can cause problems such as clogged pipes.

However, the heat exchanger 1 of this embodiment is configured so that heat exchange occurs between the first cryogenic fluid L1 in the first cryogenic fluid space LS1 and the high-temperature fluid H in the high-temperature fluid space HS, and also between the high-temperature fluid H in the case internal space IS and the second cryogenic fluid L2 in the second cryogenic fluid space LS2. As a result, the heat exchanger 1 of this embodiment can individually exchange heat between two types of cryogenic fluid (the first cryogenic fluid L1 and the second cryogenic fluid L2) and the high-temperature fluid H, reducing the need to pre-mix the two types of cryogenic fluid. This reduces the risk of problems caused by condensation that occurs during pre-mixing.

The heat exchanger 1 may be configured such that the case 3 or stacked heat exchanger 2 is provided with a discharge passage 4 that communicates with the case internal space IS, so that condensate produced when the high-temperature fluid H is cooled can be discharged from the case internal space IS through the discharge passage 4. Condensate can be produced when the high-temperature fluid H is cooled through heat exchange with the first low-temperature fluid L1 and the second low-temperature fluid L2. As described above, at least a portion of the high-temperature fluid space HS is open to the surrounding area of the stacked portion 21, so condensate produced in the high-temperature fluid space HS can also be collected in the case internal space IS and discharged through the discharge passage 4.

As described below, the stacked heat exchanger 2 may have a retaining plate 22 fixed to the case 3. As shown in FIG. 1, when the retaining plate 22 closes the second cryogenic fluid space LS2 on the insertion opening 30a side, a discharge passage 4 may be provided in the retaining plate 22. Note that the discharge passage 4 is not shown in FIGS. 2 to 4. Additionally or alternatively, the discharge passage 4 may be provided in the case 3 so as to penetrate the inner wall portion 30 and the outer wall portion 31. The discharge passage 4 may be provided on the side surface or bottom surface of the case 3. The insulating case 5, described below, may have a groove to avoid interference with the discharge passage 4. The discharge passage 4 may be closed by a closing body (not shown). When heat exchange between the first cryogenic fluid L1, the second cryogenic fluid L2, and the high-temperature fluid H is not occurring, the closing body may be removed from the discharge passage 4, and condensate in the case internal space IS may be discharged.

The stacked heat exchanger 2 may further include a retaining plate 22 provided at one end of the stacked portion 21 in the stacking direction LD of the multiple plates 20 and fixed to the case 3, and the other end of the stacked portion 21 in the stacking direction LD may be a free end within the case internal space IS. That is, the stacked portion 21 is fixed to the case 3 on only one side in the stacking direction LD. In other words, the mounting structure of the stacked portion 21 to the case 3 is a cantilever structure. When high-temperature fluid H is introduced into the high-temperature fluid space HS, the stacked portion 21 may expand due to the heat of the high-temperature fluid H. By making the other end of the stacked portion 21 a free end within the case internal space IS, it is possible to avoid excessive restraint on the expanding stacked portion 21, reducing the risk of the stacked portion 21 being damaged by thermal stress.

The retaining plate 22 can be fixed to the case 3 with fastening parts. The height and width of the retaining plate 22 may be greater than the inner dimensions of the inner wall portion 30 (the height and width of the insertion opening 30a). The height and width of the retaining plate 22 may be greater than the inner dimensions of the outer wall portion 31 so that the retaining plate 22 closes the case internal space IS at one end in the stacking direction LD.

The heat exchanger 1 may further include an insulating case 5 that covers the outer periphery of the case 3. By having the insulating case 5 cover the outer periphery of the case 3, it is possible to prevent the heat of the high-temperature fluid H from escaping outside the case 3. The insulating case 5 can be made of a heat insulating material or a vacuum insulation layer.

It is preferable that the temperature of the second cryogenic fluid L2 be lower than the temperature of the first cryogenic fluid L1. The high-temperature fluid H introduced into the high-temperature fluid space HS first exchanges heat with the first cryogenic fluid L1 in the first cryogenic fluid space LS1, and then moves to the case internal space IS and exchanges heat with the second cryogenic fluid L2 in the second cryogenic fluid space LS2. Having a lower temperature of the second cryogenic fluid L2 than the temperature of the first cryogenic fluid L1 allows the heat of the high-temperature fluid H to be efficiently transferred to the first cryogenic fluid L1 and the second cryogenic fluid L2. Alternatively, if the temperature difference between the first cryogenic fluid L1 and the second cryogenic fluid L2 is small, or if the heat capacity of the high-temperature fluid H is sufficiently greater than the heat capacity of the first cryogenic fluid L1 and the second cryogenic fluid L2, the temperature of the second cryogenic fluid L2 may be higher than the temperature of the first cryogenic fluid L1.

The holding plate 22 may be provided with a first supply section 22a for supplying the first low-temperature fluid L1 to the first low-temperature fluid space LS1, a first outlet section 22b for extracting the first low-temperature fluid L1 from the first low-temperature fluid space LS1, a second supply section 22c for supplying the high-temperature fluid H to the high-temperature fluid space HS, and a second outlet section 22d for extracting the high-temperature fluid H from the high-temperature fluid space HS. The first supply section 22a and the first outlet section 22b are preferably spaced apart from each other in the height and width directions of the holding plate 22, and are preferably arranged diagonally across the holding plate 22 as in the illustrated embodiment. Similarly, the second supply section 22c and the second outlet section 22d are preferably spaced apart from each other in the height and width directions of the holding plate 22, and are preferably arranged diagonally across the holding plate 22 as in the illustrated embodiment. The first supply section 22a and the second supply section 22c may be arranged above the first outlet section 22b and the second outlet section 22d.

The case 3 may be provided with a third supply section 3a for supplying the second cryogenic fluid L2 to the second cryogenic fluid space LS2, and a third removal section 3b for removing the second cryogenic fluid L2 from the second cryogenic fluid space LS2. The third supply section 3a and the third removal section 3b may be provided so as to protrude from the insertion opening 30a toward the holding plate 22.

Next, Figure 5 is an exploded perspective view of the stacked portion 21 of Figure 4. As shown in Figure 5, each of the multiple plates 20 may have a surface portion 23 extending in a first direction D1 and a second direction D2 perpendicular to the plate thickness direction TD. The plate thickness direction TD may be synonymous with the stacking direction LD of the multiple plates 20, the first direction D1 may be synonymous with the height direction of the stacked portion 21, and the second direction D2 may be synonymous with the width direction of the stacked portion 21.

The surface portion 23 may be provided with an inlet portion 24, an outlet portion 25, and multiple guide wall portions 26. The inlet portion 24 is a portion for introducing the first low-temperature fluid L1 or the high-temperature fluid H into the first low-temperature fluid space LS1 or the high-temperature fluid space HS. The outlet portion 25 is positioned away from the inlet portion 24 in the first direction D1 and the second direction D2, and is a portion for guiding the first low-temperature fluid L1 or the high-temperature fluid H from the first low-temperature fluid space LS1 or the high-temperature fluid space HS. The guide wall portion 26 is a portion that forms a detour path 26a between the inlet portion 24 and the outlet portion 25, which directs the first low-temperature fluid L1 or the high-temperature fluid H from the inlet portion 24 toward the outlet portion 25 while detouring in the first direction D1 and/or the second direction D2.

The inlet portion 24, outlet portion 25, and guide wall portion 26 may be formed by protrusions protruding from the surface portion 23. When the surface from which these inlet portion 24, outlet portion 25, and guide wall portion 26 protrude is referred to as the surface of the surface portion 23, the inlet portion 24, outlet portion 25, and guide wall portion 26 of a certain plate 20 may be joined to the back surface of the surface portion 23 of another plate 20 arranged adjacent to it in the stacking direction LD. Joining may be performed by brazing and/or diffusion bonding, etc.

The multiple guide wall portions 26 may be multiple protrusions spaced apart from each other in the first direction D1 and extending in the second direction D2. The guide wall portions 26 may extend from the end of the surface portion 23 in the second direction D2, or may extend from a position away from the end of the surface portion 23 in the second direction D2.

It is preferable that the first gap G1 between the multiple guide wall portions 26 is wider than the second gap G2 (see Figure 3) between the stack portion 21 and the inner wall portion 30. By making the first gap G1 wider than the second gap G2, the main flow path of the first low-temperature fluid L1 or high-temperature fluid H traveling from the inlet portion 24 to the outlet portion 25 can be the detour 26a rather than the outer edge of the plate 20 and the inner wall portion 30. The first gap G1 between the multiple guide wall portions 26 may gradually narrow as it approaches the outlet portion 25 from the inlet portion 24. When the first gap G1 gradually narrows, the widest first gap G1 may be set narrower than the second gap G2. The second gap G2 may be the widest gap among the gaps between the upper surface 21a, lower surface 21b, and side surface 21c of the stack portion 21 and the inner wall portion 30. As described below, when the gap G3 (see FIG. 4) between the lower surface 21b of the stacked portion 21 and the inner wall portion 30 is wider than the gap G4 (see FIG. 4) between the upper surface 21a of the stacked portion 21 and the inner wall portion 30, the second gap G2 may be the width of the gap G3 between the lower surface 21b of the stacked portion 21 and the inner wall portion 30.

It is preferable that the first gap G1 be 20 times or more and 30 times or less than the second gap G2. When the first gap G1 is 20 times or more than the second gap G2, flow can be controlled, and when the first gap G1 is 30 times or less than the second gap G2, heat transfer performance can be ensured. For example, the first gap G1 can be approximately 30 mm, and the second gap G2 can be approximately 1 mm.

It is preferable that the gap G3 between the lower surface 21b of the laminated portion 21 and the inner wall portion 30 be wider than the gap G4 between the upper surface 21a of the laminated portion 21 and the inner wall portion 30. This is to make it easier for condensate to accumulate in the space between the lower surface 21b of the laminated portion 21 and the inner wall portion 30.

The inlet section 24 and outlet section 25 may be configured as annular protrusions with one or more slits 24a, 25a. In the illustrated embodiment, multiple slits 24a, 25a are provided at equal intervals around the circumference of the annular inlet section 24 and outlet section 25. The first low temperature fluid L1 or high temperature fluid H can enter or exit the first low temperature fluid space LS1 or high temperature fluid space HS through the slits 24a, 25a.

The surface portion 23 may further be provided with a pair of flow path forming portions 27 formed by annular protrusions. The flow path forming portion 27 of a certain plate 20 may be joined to the back surface of the surface portion 23 of another plate 20 arranged adjacent to it in the stacking direction LD, and may form a flow path for the first low-temperature fluid L1 or the high-temperature fluid H together with the inlet portion 24 and outlet portion 25 of this plate 20. That is, through holes penetrating the front and back of the surface portion 23 are provided inside the inlet portion 24, outlet portion 25, and flow path forming portion 27. Unlike the inlet portion 24 and outlet portion 25, the flow path forming portion 27 does not have one or more slits 24a, 25a. The first low-temperature fluid L1 or the high-temperature fluid H passes through the plate 20 on which the flow path forming portion 27 is provided and heads toward the other plate 20 on which the inlet portion 24 is provided.

Here, the multiple plates 20 include a first plate 201 and a second plate 202, each of which has a first surface portion 231 and a second surface portion 232 extending in a first direction D1 and a second direction D2 perpendicular to the plate thickness direction TD, respectively, a first low-temperature fluid space LS1 being provided between the surface of the first surface portion 231 and the back surface of the second surface portion 232, and a high-temperature fluid space HS being provided between the surface of the second surface portion 232 and the back surface of the first surface portion 231.

At this time, on the first surface portion 231 of the first plate 201, where the first low-temperature fluid space LS1 is formed on the surface side, the first low-temperature fluid L1 is passed through the inlet portion 24 and outlet portion 25, and the high-temperature fluid H is passed through the flow path forming portion 27. Conversely, on the second surface portion 232 of the second plate 202, where the high-temperature fluid space HS is formed on the surface side, the high-temperature fluid H is passed through the inlet portion 24 and outlet portion 25, and the first low-temperature fluid L1 is passed through the flow path forming portion 27.

The first surface portion 231 may be provided with an annular outer peripheral wall portion 28 extending from the outer edge of the first surface portion 231 in the plate thickness direction TD and joined to the back surface of the second surface portion 232 so that the first low-temperature fluid space LS1 is closed around the stack portion 21. Furthermore, at least a portion of the second surface portion 232 may be absent or partially provided with an annular outer peripheral wall portion 28 extending from the outer edge of the second surface portion 232 in the plate thickness direction TD and joined to the back surface of the first surface portion 231 so that at least a portion of the high-temperature fluid space HS is open around the stack portion 21. In the embodiment shown in FIG. 5, the outer peripheral wall portion 28 is provided in the portion corresponding to the upper surface 21a of the stack portion 21, but is not provided in the portions corresponding to the lower surface 21b and side surface 21c. The opening of the high-temperature fluid space HS around the stack portion 21 can be controlled by how the outer peripheral wall portion 28 is provided. In other words, the way the outer wall portion 28 is provided can be changed as desired.

Embodiment 2.
FIG. 6 is a plan view showing the plate 20 of the heat exchanger 1 according to embodiment 2 of the present invention, FIG. 7 is a perspective view showing the hollow protrusion 29 of FIG. 6, and FIG. 8 is a cross-sectional view of the hollow protrusion 29 along line A-A of FIG. 7.

As shown in Figures 6 to 8, the surface portions 23 of the multiple plates 20 may be provided with multiple hollow protrusions 29 spaced apart from one another in the first direction D1 and the second direction D2. The hollow protrusions 29 may protrude from the base surface 23a of the surface portion 23, which extends in the first direction D1 and the second direction D2, between the inlet portion 24, the outlet portion 25, the guide wall portion 26, the flow path forming portion 27, and the outer peripheral wall portion 28. The base surface 23a may extend in a lattice pattern so as to surround the periphery of each of the hollow protrusions 29.

As shown in Figure 8, the hollow protrusion 29 may have a protrusion surface portion 29a and a protrusion peripheral wall portion 29b that extends from the outer edge of the protrusion surface portion 29a in the plate thickness direction TD and is connected to the base surface 23a of the surface portion 23, and may have a space 29c surrounded by the protrusion surface portion 29a and the protrusion peripheral wall portion 29b on the back surface of the plate 20.

The protruding height of the hollow protrusion 29 from the base surface 23a may be lower than the height of the inlet portion 24, outlet portion 25, guide wall portion 26, flow path forming portion 27, and outer peripheral wall portion 28 from the base surface 23a. The heights of the inlet portion 24, outlet portion 25, guide wall portion 26, flow path forming portion 27, and outer peripheral wall portion 28 from the base surface 23a may be equal to one another.

When high-temperature fluid H is introduced into high-temperature fluid space HS as described above, the heat of the high-temperature fluid H can cause the laminated portion 21 to expand. At this time, the material that makes up the plate 20 tends to expand in all directions, but the hollow protrusions 29 expand to fill the gaps between them, thereby preventing an increase in the external dimensions of the plate 20.

Note that while Figure 6 shows the hollow protrusion 29 provided on the first surface 231 of the first plate 201, on whose surface side the first low-temperature fluid space LS1 is formed, alternatively or additionally, the hollow protrusion 29 may be provided on the second surface 232 of the second plate 202, on whose surface side the high-temperature fluid space HS is formed. The remaining configuration is the same as in embodiment 1.

The above describes in detail preferred embodiments of the present invention with reference to the accompanying drawings, but the present invention is not limited to such examples. It is clear that a person with ordinary skill in the technical field to which the present invention pertains can conceive of various modifications or alterations within the scope of the technical ideas set forth in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

1: Heat exchanger 2: Stacked heat exchanger 20: Plate 201: First plate 202: Second plate 21: Stacked portion 21a: Upper surface 21b: Lower surface 22: Holding plate 23: Surface portion 231: First surface portion 232: Second surface portion 24: Inlet portion 25: Outlet portion 26: Guide wall portion 26a: Bypass path 28: Outer peripheral wall portion 29: Hollow protrusion portion 29c: Space 3: Case 30: Inner wall portion 31: Outer wall portion 4: Discharge passage 5: Insulating case H: High temperature fluid HS: High temperature fluid space IS: Case internal space L1: First cold fluid L2: Second cold fluid LD: Stacking direction LS1: First cold fluid space LS2: Second cold fluid space

Claims (10)

a stacked heat exchanger having a stacked portion in which a plurality of plates are stacked, a first low-temperature fluid space into which a first low-temperature fluid is introduced, and a high-temperature fluid space into which a high-temperature fluid is introduced are formed between the plurality of plates, and at least a portion of the high-temperature fluid space is open to the periphery of the stacked portion;
a case having an inner wall portion and an outer wall portion provided outside the inner wall portion, the stack portion being disposed inside the inner wall portion, a case internal space communicating with at least a part of the high-temperature fluid space being formed between the stack portion and the inner wall portion, and a second low-temperature fluid space into which a second low-temperature fluid is introduced being formed between the inner wall portion and the outer wall portion;
Equipped with
The first cryogenic fluid in the first cryogenic fluid space and the high-temperature fluid in the high-temperature fluid space are heat exchanged, and the high-temperature fluid in the case internal space and the second cryogenic fluid in the second cryogenic fluid space are heat exchanged.
heat exchanger. The case or the laminated heat exchanger is provided with a discharge passage communicating with the internal space of the case, and is configured so that condensate generated by cooling the high-temperature fluid can be discharged from the internal space of the case through the discharge passage.
The heat exchanger of claim 1 . Each of the plurality of plates has a surface portion extending in a first direction and a second direction perpendicular to the plate thickness direction,
The surface portion is provided with a plurality of hollow protrusions spaced apart from each other in the first direction and the second direction.
The heat exchanger of claim 1 . Each of the plurality of plates has a surface portion extending in a first direction and a second direction perpendicular to the plate thickness direction,
The surface portion has
an introduction portion for introducing the first low temperature fluid or the high temperature fluid into the first low temperature fluid space or the high temperature fluid space;
an outlet portion that is disposed at a position spaced apart from the inlet portion in the first direction and the second direction and that is configured to discharge the first low-temperature fluid or the high-temperature fluid from the first low-temperature fluid space or the high-temperature fluid space;
a plurality of guide walls that form a detour between the inlet and the outlet, through which the first low-temperature fluid or the high-temperature fluid from the inlet is directed toward the outlet while detouring in the first direction and/or the second direction.
The heat exchanger of claim 1 . a first interval between the plurality of guide wall portions is wider than a second interval between the stack portion and the inner wall portion;
5. The heat exchanger according to claim 4. a gap between the lower surface of the stacked portion and the inner wall portion is wider than a gap between the upper surface of the stacked portion and the inner wall portion;
The heat exchanger of claim 1 . the stacked heat exchanger further includes a holding plate provided at one end of the stacked portion in a stacking direction of the plurality of plates and fixed to the case,
The other end of the stacked portion in the stacking direction is a free end within the case internal space.
The heat exchanger of claim 1 . the plurality of plates include a first plate and a second plate, the first plate and the second plate having a first surface portion and a second surface portion extending in a first direction and a second direction perpendicular to a plate thickness direction, respectively, the first low-temperature fluid space being provided between a surface of the first surface portion and a back surface of the second surface portion, and the high-temperature fluid space being provided between a surface of the second surface portion and a back surface of the first surface portion,
the first surface portion is provided with an annular outer peripheral wall portion extending from an outer edge of the first surface portion in the plate thickness direction and joined to a back surface of the second surface portion so that the first cryogenic fluid space is closed around the periphery of the stacked portion;
At least a portion of the second surface portion is not provided with or is partially provided with an annular outer peripheral wall portion extending from an outer edge of the second surface portion in the plate thickness direction and joined to a back surface of the first surface portion so that at least a portion of the high-temperature fluid space is opened to the periphery of the stack portion.
The heat exchanger of claim 1 . The heat exchanger according to claim 1 , further comprising: a heat insulating case covering an outer periphery of the case. the temperature of the second cryogenic fluid is lower than the temperature of the first cryogenic fluid;
10. The heat exchanger of claim 9.