CN110537070B - Plate heat exchanger - Google Patents
Plate heat exchanger Download PDFInfo
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- CN110537070B CN110537070B CN201780089689.1A CN201780089689A CN110537070B CN 110537070 B CN110537070 B CN 110537070B CN 201780089689 A CN201780089689 A CN 201780089689A CN 110537070 B CN110537070 B CN 110537070B
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- Prior art keywords
- medium
- heat transfer
- plate
- transfer plate
- heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
- F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
- F28F3/046—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being linear, e.g. corrugations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
- F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
- F28D9/005—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another the plates having openings therein for both heat-exchange media
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
- F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
- F28D9/0056—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another with U-flow or serpentine-flow inside conduits; with centrally arranged openings on the plates
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A plate heat exchanger performs heat exchange using a plurality of stacked heat transfer plates. Each heat transfer plate includes a plate main body, a first medium inflow portion, a first medium outflow portion, a second medium inflow portion, a second medium outflow portion, and a protrusion forming a flow channel. At least one of the first medium inflow portion and the first medium outflow portion is disposed at one of two corners located on one end side of the plate main body where the protrusions are in contact with each other. At least one of the second medium inflow portion and the second medium outflow portion is disposed at one of two corners located on the other end side of the plate main body separated by the protrusion.
Description
Technical Field
The present invention relates to a plate heat exchanger.
Background
Plate heat exchangers using a medium for heat exchange are known. For example, the following plate heat exchangers are known: a plurality of metal plates that have been similarly pressed are stacked, and a medium is made to flow through a stacked space between the stacked first metal plate and second metal plate and a stacked space between the stacked second metal plate and third metal plate to perform heat exchange (for example, patent documents 1 to 4).
The plate heat exchanger is configured to exchange heat between a medium flowing through the stacked space and a pair of metal plates sandwiching the medium. Specifically, the first metal plate and the second metal plate exchange heat with a medium flowing through a first stacked space between the first metal plate and the second metal plate, the second metal plate and the third metal plate exchange heat with a medium flowing through a second stacked space between the second metal plate and the third metal plate, and the third metal plate and the fourth metal plate exchange heat with a medium flowing through a third stacked space between the third metal plate and the fourth metal plate.
In the plate heat exchanger as described above, the flow passage formed in the first stacked space and the flow passage formed in the second stacked space are flow passages having the same distance. Therefore, substantially uniform heat exchange can be performed between the plurality of metal plates.
Prior art documents
Patent document
Patent document 1: japanese patent laid-open publication No. 5-280883
Patent document 2: japanese patent laid-open publication No. 2011-
Patent document 3: japanese patent laid-open publication No. 2000-241094
Patent document 4: japanese patent laid-open publication No. 2009-186142
Disclosure of Invention
Problems to be solved by the invention
However, in consideration of diversification of the heat exchange mechanism, a situation is also conceivable in which heat exchange is performed using a plurality of media having different heat capacities. In addition, a case where a plurality of media having different thermal conductivities are used is conceivable. In the case of the conventional plate heat exchanger as described above, even if one medium has a low heat capacity, the heat exchange efficiency of the heat exchanger may be suppressed depending on the other medium having a large heat capacity. Even if one medium has a high thermal conductivity, the heat exchange efficiency of the heat exchanger may be suppressed depending on the other medium having a low thermal conductivity.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a plate heat exchanger capable of reducing suppression of heat exchange efficiency by one medium even when a plurality of media having different thermal conductivities are used for heat exchange even when heat capacities are different between the plurality of media performing heat exchange.
Means for solving the problems
A plate heat exchanger according to an aspect of the present invention performs heat exchange using a plurality of heat transfer plates stacked. The plurality of heat transfer plates include a first heat transfer plate that performs heat exchange, and a second heat transfer plate that is stacked with a first stacking space in which a first medium flows and performs heat exchange. The first heat transfer plate and the second heat transfer plate each include: a plate main body of a rectangular shape that performs heat exchange; a first medium inflow unit and a first medium outflow unit for allowing a first medium to flow in and flow out, or a second medium inflow unit and a second medium outflow unit for allowing a second medium to flow in and flow out; and a protrusion which is in contact with one end side in the longitudinal direction of the plate body, is separated from the other end side, protrudes in the stacking direction, and forms a flow path for the first medium or the second medium. At least one of the first medium inflow portion and the first medium outflow portion is disposed at one corner of two corners located at one end side of the plate main body where the protrusions are in contact with each other. At least one of the second medium inflow portion and the second medium outflow portion is disposed at one of two corners located on the other end side of the plate body separated by the protrusion. The first heat transfer plate is stacked such that one end side thereof is in contact with the other end side of the second heat transfer plate.
ADVANTAGEOUS EFFECTS OF INVENTION
According to one aspect of the present invention, even in the case where a plurality of media having different thermal conductivities are used for heat exchange, suppression of heat exchange efficiency by one of the media can be reduced even in the case where a plurality of media having different thermal conductivities are used for heat exchange.
Drawings
Fig. 1 is an explanatory diagram showing a structure of a plate heat exchanger according to embodiment 1.
Fig. 2 is a plan view illustrating the shape of each heat transfer plate according to embodiment 1.
Fig. 3 is an explanatory view for explaining a state in which a plurality of heat transfer plates are stacked in the plate heat exchanger according to embodiment 1.
Fig. 4 is a plan view illustrating the shape of each heat transfer plate according to embodiment 2.
Fig. 5 is an explanatory view for explaining a state in which a plurality of heat transfer plates are stacked in the plate heat exchanger according to embodiment 3.
Fig. 6 is a plan view describing the shape of each heat transfer plate of embodiment 4.
Fig. 7 is an explanatory diagram showing positions of the first medium inflow portion 4, the first medium outflow portion 5, the second medium inflow portion 6, and the second medium outflow portion 7 of the plate heat exchanger 1 according to embodiment 5.
Fig. 8 is a graph showing the relationship between the flow path length and the temperature of the first medium and the second medium in embodiment 5.
Detailed Description
Hereinafter, embodiments of the plate heat exchanger disclosed in the present application will be described in detail with reference to the drawings. The embodiments described below are examples, and the present invention is not limited to these embodiments.
Embodiment mode 1
Fig. 1 is an explanatory diagram showing a structure of a plate heat exchanger 1 according to embodiment 1. The plate heat exchanger 1 is a heat exchanger in which a plurality of heat transfer plates 2, and 2 … … are stacked in the thickness direction. The plate heat exchanger 1 exchanges heat with the first medium and the second medium by flowing the first medium or the second medium through the stacked space between the stacked heat transfer plates 2 and the heat transfer plates 2 as a flow path. The arrows in fig. 1 indicate the flow direction of the medium in each stack space.
In the plate heat exchanger 1, the first medium is caused to flow through the first stacked space between the stacked adjacent first heat transfer plate 2 and second heat transfer plate 2 as a flow path, the second medium is caused to flow through the second stacked space between the stacked adjacent second heat transfer plate 2 and third heat transfer plate 2 as a flow path, the first medium is caused to flow through the third stacked space between the stacked adjacent third heat transfer plate 2 and fourth heat transfer plate 2 as a flow path, and the second medium is caused to flow through the fourth stacked space between the stacked adjacent fourth heat transfer plate 2 and fifth heat transfer plate 2 as a flow path. That is, in the plate heat exchanger 1, the first medium flows in the first stacked space, the second medium flows in the second stacked space adjacent to the first stacked space in the thickness direction, the first medium flows in the third stacked space adjacent to the second stacked space in the thickness direction, and different media alternately flow in the stacked direction. In the example of fig. 1, different media are alternately flowed in the stacking direction as follows: the first stacked space between the uppermost first heat transfer plate 2 and the second heat transfer plate 2 adjacent to the lower portion thereof is defined as a flow path, the first medium flows from the right to the left in the drawing, the second stacked space between the second heat transfer plate 2 and the third heat transfer plate 2 adjacent to the lower portion thereof is defined as a flow path, the second medium flows from the left to the right, and the third stacked space between the third heat transfer plate 2 and the fourth heat transfer plate 2 adjacent to the lower portion thereof is defined as a flow path, and the first medium flows from the right to the left.
Each heat transfer plate 2 is a plate-like member having a rectangular plate body, and exchanges heat with the first medium and the second medium. For example, each heat transfer plate 2 is a member made by press working, which has stainless steel, iron, aluminum, copper, or the like as a material.
First medium and second mediumThe two media are water, oil, and CO for transferring heat between the external member and the heat transfer plate 22Liquid or gas-liquid mixed medium such as HFC refrigerant. For example, the first medium is made of a material different from that of the second medium, and the first medium has a higher thermal conductivity than the second medium.
Fig. 2 is a plan view illustrating the shape of each heat transfer plate 2 of embodiment 1. Each heat transfer plate 2 includes, in the plate main body: two projections 8, 9; the first medium inflow portion 4; a first medium outflow unit 5; the second medium inflow/outflow portion 6; a second medium outflow portion 7; and a chevron-shaped relief 3.
In order to secure a lamination space between the adjacent heat transfer plates 2 to be laminated, each of the two projections 8 and 9 is configured to project from the surface of one heat transfer plate 2 to one side by press working. That is, the two protrusions 8 and 9 are configured to protrude in the stacking direction, respectively, and form a flow path for a first medium or a second medium, which will be described later.
The rear surfaces of the projections 8 and 9 are formed in a recessed shape recessed toward the side from which the projections 8 and 9 project. Fig. 2 shows linear projections 8 and 9 extending in the longitudinal direction of the heat transfer plate 2 in the form of a rectangular plate. One projection 8 is in contact with one end side of the heat transfer plate 2 but is spaced apart from the other end side, and the other projection 9 is in contact with the other end side of the heat transfer plate 2 but is spaced apart from the one end side.
The two projections 8 and 9 are disposed at positions where the heat transfer plate 2 is divided into three parts. More specifically, the two protrusions 8 and 9 extending in the longitudinal direction are disposed at positions biased from a position at which the heat transfer plate 2 is trisected toward one end side in the short-side direction. The height of the projections 8 and 9 in the stacking direction will be described in detail later.
The first medium inflow portion 4 and the first medium outflow portion 5 are each an opening portion for allowing the first medium to flow into and out of one stacked space formed between the other heat transfer plate 2 stacked on one side. The first medium flows into one stacked space from the first medium inflow unit 4, and the first medium flows out of the one stacked space from the first medium outflow unit 5. One of the first medium inflow portion 4 and the first medium outflow portion 5 is disposed at one corner located on one diagonal line of the rectangular plate-shaped heat transfer plate 2, and the other of the first medium inflow portion 4 and the first medium inflow portion 5 is disposed at the other corner located on one diagonal line of the rectangular plate-shaped heat transfer plate 2.
The second medium inflow portion 6 and the second medium outflow portion 7 are openings for allowing the second medium to flow into and out of another stacked space formed between the other heat transfer plate 2 stacked on the other side. The second medium flows into the other laminated space from the second medium inflow unit 6, and flows out of the other laminated space from the second medium outflow unit 7. One of the second medium inflow portion 6 and the second medium outflow portion 7 is disposed at one corner located on the other diagonal line of the rectangular plate-shaped heat transfer plate 2, and the other of the second medium inflow portion 6 and the second medium outflow portion 7 is disposed at the other corner located on the other diagonal line of the rectangular plate-shaped heat transfer plate 2.
In order to improve the heat exchange efficiency of the first medium flowing in one stacked space and the second medium flowing in the other stacked space, the chevron concave-convex portion 3 is concave-convex on the surface in a chevron shape across the protrusions 8, 9. In other words, the chevron shaped uneven portion 3 is configured to be divided into three parts by the two protrusions 8, 9.
The chevron uneven portion 3 is formed to be uneven in the thickness direction of the plate heat exchanger 1, in other words, in the stacking direction. The chevron uneven portion 3 has a chevron shape that tapers from one end of the heat transfer plate 2 to the other end.
Between the chevron-shaped uneven portion 3 and the other heat transfer plate 2 stacked on one side, a gap is provided in the thickness direction of the plate heat exchanger 1 in consideration of the flow velocity of the first medium. Similarly, a gap is provided in the thickness direction of the plate heat exchanger 1 between the chevron shaped uneven portion 3 and the other heat transfer plate 2 stacked on the other side, taking into account the flow velocity of the second medium.
When the heat transfer plate 2 has the chevron shaped uneven portions 3 as described above, the uneven shape of one heat transfer plate 2 defining one laminated space and the uneven shape of the other heat transfer plate 2 defining one laminated space narrow the gap in the thickness direction of one laminated space. The flow velocity of the medium flowing in one laminated space becomes large in the narrowed gap. Therefore, the heat exchange efficiency between the medium flowing through the single stacked space and the heat transfer plate 2 can be further improved.
Fig. 3 is an explanatory diagram for explaining a state in which the plurality of heat transfer plates 2, 2 are stacked in the plate heat exchanger 1 according to embodiment 1. The state of lamination of two heat transfer plates 2, 2 among the plurality of heat transfer plates 2, … … included in the plate heat exchanger 1 is schematically shown as an example. In fig. 3, the two heat transfer plates 2, 2 in a state of being inverted by 180 ° in the planar direction of the plate shape different from the stacked thickness direction are shown on the right side, the two heat transfer plates 2, 2 are stacked on the center, and the stacked state is shown on the left side, which is a state of being cut along the a-a cross section.
As shown in fig. 1 and 3, in the plate heat exchanger 1 according to embodiment 1, a plurality of heat transfer plates 2 having the same plate shape are alternately arranged so as to be reversed by 180 ° in the planar direction.
As shown in fig. 1, the first heat transfer plate 2 and the second heat transfer plate 2 stacked in a 180 ° inverted state are stacked such that the first medium inflow portion 4 of the first heat transfer plate 2 and the first medium inflow portion 4 of the second heat transfer plate 2 face each other with a gap in the thickness direction, and the first medium outflow portion 5 of the first heat transfer plate 2 and the first medium outflow portion 5 of the second heat transfer plate 2 face each other with a gap in the thickness direction. On the other hand, the second medium inflow portions 6 of the first heat transfer plate 2 are joined to the second medium inflow portions 6 of the second heat transfer plate 2, and the second medium outflow portions 7 of the first heat transfer plate 2 are joined to the second medium outflow portions 7 of the second heat transfer plate 2. The second heat exchanger plate 2 and the third heat exchanger plate 2 are stacked such that the second medium inflow portion 6 of the second heat exchanger plate 2 and the second medium inflow portion 6 of the third heat exchanger plate 2 face each other with a gap in the thickness direction therebetween, the second medium outflow portion 7 of the second heat exchanger plate 2 and the second medium outflow portion 7 of the third heat exchanger plate 2 face each other with a gap in the thickness direction therebetween, the first medium inflow portion 4 of the second heat exchanger plate 2 is joined to the first medium inflow portion 4 of the third heat exchanger plate 2, and the first medium outflow portion 5 of the second heat exchanger plate 2 is joined to the first medium outflow portion 5 of the third heat exchanger plate 2. The same 180 ° reverse arrangement is repeated for the fourth heat transfer plate 2 and the fifth heat transfer plate 2, … … stacked next.
In the plate heat exchanger 1 in which the 180 ° reversal arrangement of the heat transfer plates 2 is repeated as described above, the first medium flows into the first stacked space between the first heat transfer plate 2 and the second heat transfer plate 2 from the first medium inflow portions 4 facing each other with a gap in the thickness direction. On the other hand, the second medium does not flow into and out of the first stacked space due to the joining of the second medium inflow portions 6 of the first heat transfer plates 2 and the second medium inflow portions 6 of the second heat transfer plates 2 and the joining of the second medium outflow portions 7 of the first heat transfer plates 2 and the second medium outflow portions 7 of the second heat transfer plates 2.
In the plate heat exchanger 1 in which the heat transfer plates 2 are arranged by reversing 180 ° as described above, the second medium flows into and flows out of the second stacked space between the second heat transfer plates 2 and the third heat transfer plates 2 from the second medium inflow portion 6 and the second medium outflow portion 7 that face each other with a gap therebetween in the thickness direction. On the other hand, the first medium does not flow into and out of the second stacked space due to the joining of the first medium inflow portion 4 of the second heat exchanger plate 2 and the first medium inflow portion 4 of the third heat exchanger plate 2 and the joining of the first medium outflow portion 5 of the second heat exchanger plate 2 and the first medium outflow portion 5 of the third heat exchanger plate 2.
In the plate heat exchanger 1, by repeating the above-described 180 ° reversal arrangement of the heat transfer plates 2, the first medium inflow/outflow type laminated spaces in which the first medium flows in and out but the second medium does not flow in and out and the second medium inflow/outflow type laminated spaces in which the second medium flows in and out but the first medium does not flow in and out alternate in the thickness direction of the plate heat exchanger 1.
In the first-medium inflow/outflow type laminated space as described above, one facing portion where the first-medium inflow portions 4 of the first heat transfer plates 2 and the first-medium inflow portions 4 of the second heat transfer plates 2 face each other is formed, and the other facing portion where the first-medium outflow portions 5 of the first heat transfer plates 2 and the first-medium outflow portions 5 of the second heat transfer plates 2 face each other is formed. The opposing portions of the first medium inflow and outflow portions 4 and 5 on one side of the first medium inflow and outflow portions are located at one corner portion located on one end side on one diagonal line of the rectangular heat transfer plate 2, and the opposing portions of the first medium inflow and outflow portions 4 and 5 on the other side are located at the other corner portion located on the other end side on the same diagonal line as the one corner portion. In the example of fig. 1, an S-shaped flow path is defined by a linear protrusion 8, a linear protrusion 9, an outer periphery of the heat transfer plate 2, and two first medium facing portions, the protrusion 8 being in contact with and spaced apart from one end side of the heat transfer plate 2, the protrusion 9 being in contact with and spaced apart from the other end side of the heat transfer plate 2, and the two facing portions being located on both end sides of the S-shaped flow path. Therefore, in the plate heat exchanger 1, the first medium having a higher thermal conductivity or a smaller heat capacity than the second medium forms a return flow path extending from one end side to the other end side in the longitudinal direction of the heat transfer plate 2, then extending from the other end side to the one end side, and further extending from the one end side to the other end side.
In the second medium inflow and outflow type laminated space as described above, one opposing portion where the second medium inflow and outflow portions 6 of the first heat transfer plates 2 and the second medium inflow and outflow portions 7 of the second heat transfer plates 2 oppose each other is formed, and the other opposing portion where the second medium inflow and outflow portions 7 of the first heat transfer plates 2 and the second medium inflow and outflow portions 6 of the second heat transfer plates 2 oppose each other is formed. The opposing portion of one of the second medium inflow and outflow portions 6 and 7 for inflow and outflow of the second medium is located at a corner portion located on one end side on the other diagonal line of the rectangular heat transfer plate 2, and the opposing portion of the other second medium inflow and outflow portion 6 and 7 is located at the other corner portion located on the other end side on the same diagonal line as the corner portion. In the example of fig. 1, a zigzag flow path occupying the center of the S-shaped flow path is defined by a linear protrusion 8, a linear protrusion 9, the outer periphery of the heat transfer plate 2, and two second medium facing portions, the protrusion 8 being in contact with and spaced apart from one end side of the heat transfer plate 2, the protrusion 9 being in contact with and spaced apart from the other end side of the heat transfer plate 2, and the two facing portions being located at both ends of the zigzag flow path. Therefore, in the plate heat exchanger 1, the second medium having a lower thermal conductivity or a larger heat capacity than the first medium forms a non-return flow path that extends from one end side to the other end side in the longitudinal direction of the heat transfer plate 2, and that does not extend from the one end side to the other end side and then returns from the other end side to the one end side.
As described above, the two projections 8 and 9 extending in the longitudinal direction are disposed at positions biased from the position at which the heat transfer plate 2 is trisected toward one end side in the short-side direction with respect to the two projections 8 and 9. Therefore, as shown in the left side portion of fig. 3, in the stacked structure in which the reverse 180 ° arrangement of the heat transfer plates 2 is repeated, the two protrusions 8, 9 of the other heat transfer plate 2 are in contact with the lower surface of the one heat transfer plate 2. By this contact, the accuracy of forming the S-shaped folded flow path can be improved. In addition, the accuracy of forming the zigzag non-folded flow path can be improved by this contact.
In the laminated space having the same volume, the distance between both ends of the zigzag non-folded flow path through which the second medium flows, which is a part of the zigzag folded flow path, is shorter than the distance between both ends of the zigzag folded flow path through which the first medium flows. In addition, the amount of change in the vector from one end of the zigzag-shaped non-folded flow path, which is a part of the zigzag-shaped folded flow path and through which the second medium flows, toward the other end along the zigzag flow path is smaller than the amount of change in the vector from one end of the zigzag-shaped folded flow path through which the first medium flows toward the other end along the zigzag flow path. Therefore, the flow velocity of the second medium having a lower thermal conductivity or a larger heat capacity than the first medium can be made larger than the flow velocity of the first medium. Therefore, in the plate heat exchanger 1 according to embodiment 1, even when the plurality of media for performing heat exchange have different heat capacities, and even when the plurality of media having different thermal conductivities are used for heat exchange, the suppression of the heat exchange efficiency by one of the media can be reduced.
As described above, in the plate heat exchanger 1 according to embodiment 1, the first medium flow path through which the first medium flows and the second medium flow path through which the second medium flows are separately formed. Specifically, a first medium flow path is formed in the first stacked space, and a second medium flow path is formed in a second stacked space adjacent to the first stacked space with the heat transfer plate 2 interposed therebetween. Therefore, the first medium and the second medium are not mixed. In the plate heat exchanger 1 according to embodiment 1, the path from the inflow portion to the outflow portion in the first medium flow path is longer than the path from the inflow portion to the outflow portion in the second medium flow path, and the amount of change in the vector from the inflow portion to the outflow portion in the first medium flow path is larger than the amount of change in the vector from the inflow portion to the outflow portion in the second medium flow path. Therefore, the flow velocity of the second medium having a low thermal conductivity or a large heat capacity can be configured to be larger than the flow velocity of the first medium having a high thermal conductivity or a small heat capacity.
In the plate heat exchanger 1 according to embodiment 1, as described above, the medium flow rate, the vector change amount, or the path length is changed between the first medium and the second medium by the reversed 180 ° arrangement in which the heat transfer plates 2 having the same shape are stacked in a 180 ° reversed manner without using a plurality of heat transfer plates having different shapes. Therefore, the plate heat exchanger 1 according to embodiment 1 can contribute to reduction in manufacturing cost.
In embodiment 1, an example in which each heat transfer plate 2 has two protrusions 8 and 9 is described. However, the present invention is not limited to the above examples. Each heat transfer plate 2 may have three or more projections 8 and 9. This can further extend the path length of the flow path, and can further reduce the suppression of the heat exchange efficiency.
In embodiment 1, an example in which each heat transfer plate 2 integrally has two protrusions 8 and 9 protruding from the front surface to one side by press working is described. However, the present invention is not limited to the above examples. In order to secure a space for stacking with another heat transfer plate 2 stacked, each heat transfer plate 2 may be formed to have two projections 8 and 9 as separate bodies. For example, a frame-shaped plate provided with two projections 8 and 9 may be provided between the heat transfer plate 2 and the heat transfer plate 2. Thereby, the flexibility with respect to the manufacturing of the plate heat exchanger 1 is increased.
In embodiment 1, an example in which a gap is provided in the thickness direction of the plate heat exchanger 1 between the chevron shaped uneven portion 3 and the other heat transfer plate 2 on one side of the stack and the other heat transfer plate 2 on the other side of the stack is described. However, the present invention is not limited to the above examples. In consideration of improvement in heat exchange efficiency, the irregularities in the thickness direction of the herringbone uneven portion 3 may be increased without providing a gap. In addition, in consideration of a decrease in heat exchange efficiency, an increase in medium flow velocity, and the like, the unevenness in the thickness direction of the herringbone uneven portion 3 may be further reduced. In consideration of further reduction in heat exchange efficiency, increase in medium flow rate, and the like, a structure may also be adopted in which the chevron shaped uneven portion 3 is not provided.
In embodiment 1, an example in which linear protrusions 8 and 9 extending in the longitudinal direction are provided on the heat transfer plate 2 is described. However, the present invention is not limited to the above examples. The curved projections 8 and 9 may be provided as long as the amount of change in the vector from one end to the other end of the flow path through which the first medium flows is different from the amount of change in the vector from one end to the other end of the flow path through which the second medium flows.
In embodiment 1, an example in which two protrusions 8 and 9 extending in the longitudinal direction are provided on the heat transfer plate 2 is described. However, the present invention is not limited to the above examples. Three or more protrusions may be provided as long as the amount of change in the vector from one end to the other end of the flow path through which the first medium flows is different from the amount of change in the vector from one end to the other end of the flow path through which the second medium flows. For example, when three or more odd-numbered projections are provided, the projections that are in contact with the one end side but are spaced apart from the other end side and the projections that are in contact with the other end side but are spaced apart from the one end side may be alternately arranged in parallel, the first medium inflow/outflow portion 4 may be disposed at one corner where the closest projection is in contact with the end, and the first medium inflow/outflow portion 5 may be disposed at the other corner located in the short-side direction of the heat transfer plate 2. For example, when three or more protrusions are provided in an even number, protrusions that are in contact with one end side but are spaced apart from the other end side and protrusions that are in contact with the other end side but are spaced apart from the one end side may be alternately arranged in parallel, the first medium inflow and outflow portions 4 may be disposed at one corner where the closest protrusion is in contact with the end, and the first medium inflow and outflow portions 5 may be disposed at the other corner located on a diagonal line of the heat transfer plate 2 with respect to the one corner.
In embodiment 1, an example in which each heat transfer plate 2 is provided with a chevron-shaped concave-convex portion 3 having a V shape whose tip is tapered from one end side to the other end side in the longitudinal direction of the heat transfer plate 2 is described. However, the present invention is not limited to the above examples. The chevron-shaped uneven portion 3 may be formed in a V shape tapered from one end of the heat transfer plate 2 in the short-side direction toward the other end, and may be provided on each heat transfer plate 2.
In the plate heat exchanger 1 according to embodiment 1, as shown in fig. 2, the first medium inflow portion 4, the first medium outflow portion 5, the second medium inflow portion 6, and the second medium outflow portion 7 have substantially the same opening area as one another. However, in the plate heat exchanger 1 according to embodiment 2, a description will be given of a configuration in which the first medium inflow portion 4, the first medium outflow portion 5, the second medium inflow portion 6, and the second medium outflow portion 7 have different opening areas with reference to fig. 4. The plate heat exchanger 1 according to embodiment 2 is not described in detail as to the same structure as the plate heat exchanger 1 according to embodiment 1.
Fig. 4 is a plan view describing the shape of each heat transfer plate 2 of embodiment 2. Each heat transfer plate 2 includes two protrusions 8 and 9, a first medium inflow portion 4, a first medium outflow portion 5, a second medium inflow portion 6, a second medium outflow portion 7, and a chevron-shaped uneven portion 3.
In embodiment 2, the opening areas of the first medium inflow portion 4 and the first medium outflow portion 5 are smaller than the opening areas of the second medium inflow portion 6 and the second medium inflow portion 7. Since the other structures are the same as those in embodiment 1, descriptions thereof are omitted.
The projection 8 closest to the first medium inflow portion 4 and the second medium outflow portion 7 is separated from one end side of the heat transfer plate 2 but is in contact with the other end side. Due to the contact structure of the protrusion 8 and the isolation structure of the protrusion 8, the flow path of the first medium near the first medium inflow portion 4 is smaller than the flow path of the second medium near the second medium outflow portion 7. However, in embodiment 2, since the opening area of the first medium inflow portion 4 is made smaller than the opening area of the second medium inflow portion 7, the difference between the pressure loss of the first medium in the first medium inflow portion 4 and the first medium outflow portion 5 and the pressure loss of the second medium in the second medium inflow portion 6 and the second medium outflow portion 7 can be suppressed.
The projection 9 closest to the first medium inflow/outflow portion 5 and the second medium inflow/outflow portion 6 is in contact with one end side of the heat transfer plate 2 but is separated from the other end side. Due to the contact structure of the protrusions 9 and the isolation structure of the protrusions 9, the flow path of the first medium near the first medium outflow portion 5 is smaller than the flow path of the second medium near the second medium inflow portion 6. However, in embodiment 2, since the opening area of the first medium inflow portion 5 is made smaller than the opening area of the second medium outflow portion 6, the difference between the pressure loss of the first medium in the first medium inflow portion 5 and the pressure loss of the second medium in the second medium outflow portion 6 can be suppressed. Therefore, the plate heat exchanger 1 according to embodiment 2 can suppress the difference in pressure loss and reduce the suppression of the heat exchange efficiency by one medium even when a plurality of media having different thermal conductivities or heat capacities are used.
As shown in fig. 1 and 3, the plate heat exchanger 1 according to embodiment 1 has a structure in which a plurality of heat transfer plates 2, and … … are alternately reversed and stacked by 180 °. However, in the plate heat exchanger 1 according to embodiment 3, a structure in which at least a part of the plurality of heat transfer plates 2, and … … are directly stacked in the same direction without being inverted by 180 ° will be described with reference to fig. 5. The plate heat exchanger 1 according to embodiment 3 is not described in detail as to the same structure as the plate heat exchanger 1 according to embodiment 1.
Fig. 5 is an explanatory diagram illustrating a stacked state of the plurality of heat transfer plates 2, and … … in the plate heat exchanger 1 according to embodiment 3. A state in which at least two heat transfer plates 2, 2 included in the plurality of heat transfer plates 2, … … included in the plate heat exchanger 1 are stacked is schematically shown as an example. Fig. 5 shows two heat transfer plates 2, 2 in the same direction without being inverted by 180 ° in the planar direction of the plate shape different from the stacked thickness direction, in the right side portion, in the central portion, in the state where the two heat transfer plates 2, 2 are stacked, and in the left side portion, in the state of being cut along the B-B cross section.
In the plate heat exchanger 1 according to embodiment 3, the two heat transfer plates 2 and 2 having the same shape are stacked in the same direction, and the two protrusions 8 and 9 of the lower heat transfer plate 2 do not contact the upper heat transfer plate 2. In other words, a gap is formed between the two protrusions 8 and 9 of the lower heat transfer plate 2 and the upper heat transfer plate 2. Therefore, the flow path division in the short side direction of the heat transfer plate 2 by the two protrusions 8 and 9 is suppressed, and the flow from the medium outflow portion to the medium inflow portion is promoted.
When the above-described same-direction stacked structure is used for the stacked space in which the flow path through which the second medium flows, the flow velocity of the second medium having a lower thermal conductivity or a higher heat capacity than the first medium can be further increased. Therefore, even when a plurality of media having different thermal conductivities or heat capacities are used in the plate heat exchanger 1 according to embodiment 3, suppression of the heat exchange efficiency by one of the media can be further reduced.
In the plate heat exchanger 1 according to embodiment 1, as shown in fig. 2, each heat transfer plate 2 is exemplified to have two protrusions 8 and 9. However, in the plate heat exchanger 1 according to embodiment 4, a structure in which each heat transfer plate 2 includes one projection 8 will be described with reference to fig. 6. The plate heat exchanger 1 according to embodiment 4 will not be described in detail with respect to the same structure as the plate heat exchanger 1 according to embodiment 1.
Fig. 6 is a plan view describing the shape of each heat transfer plate 2 of embodiment 4. The heat transfer plate 2 includes one projection 8, the first medium inflow portion 4, the first medium outflow portion 5, the second medium inflow portion 6, the second medium outflow portion 7, and the chevron shaped uneven portion 3.
In embodiment 4, one projection 8 is disposed, and the projection 8 is separated from one end in the longitudinal direction of the heat transfer plate 2 and is in contact with the other end. The second medium inflow portion 6 is disposed at one corner portion in the short-side direction on one end side spaced from the protrusion 8, and the second medium outflow portion 7 is disposed at the other corner portion. The first medium inflow portion 4 is disposed at one corner portion in the short-side direction on the other end side in contact with the protrusion 8, and the first medium outflow portion 5 is disposed at the other corner portion.
In embodiment 4 as described above, as shown in fig. 6, a U-shaped folded flow path through which the first medium flows is formed, and an I-shaped non-folded flow path through which the second medium flows is formed as a part of the U-shaped folded flow path. The distance between both ends of the path of the I-shaped non-folded flow path is shorter than the distance between both ends of the path of the U-shaped folded flow path. In addition, the amount of change in the vector from one end to the other end of the I-shaped non-folded flow path, which is a part of the U-shaped folded flow path and through which the second medium flows, is smaller than the amount of change in the vector from one end to the other end of the U-shaped folded flow path through which the first medium flows. Therefore, the flow velocity of the second medium having a lower thermal conductivity or a larger heat capacity than the first medium can be made larger than the flow velocity of the first medium. Therefore, in the plate heat exchanger 1 according to embodiment 4, even when the plurality of media for performing heat exchange have different heat capacities, and even when the plurality of media having different thermal conductivities are used for heat exchange, the suppression of the heat exchange efficiency by one of the media can be reduced.
Fig. 7 is an explanatory diagram showing the configuration of the first medium inflow/outflow portion and the second medium inflow/outflow portion of the plate heat exchanger 1 according to embodiment 5. The positions of the first medium inflow 4, the first medium outflow 5, the second medium inflow 6, and the second medium outflow 7 in the heat transfer plates 2 of the plate heat exchanger 1 are schematically shown. Fig. 7 shows a stacked state in which the heat transfer plates 2 of the first layer are reversed in the planar direction by 180 °, the heat transfer plates of the second layer are arranged in the same direction, and the heat transfer plates of the third layer are reversed in the planar direction by 180 °, the odd-numbered layers are reversed by 180 °, and the even-numbered layers are stacked in the same direction. Fig. 7 shows a diagram on the left side in which the first medium inflow portion 4 and the second medium inflow portion 6 are disposed at one end in the longitudinal direction of the heat transfer plate 2, and the first medium outflow portion 5 and the second medium outflow portion 7 are disposed at the other end in the longitudinal direction, and a diagram on the right side in fig. 7 shows a diagram in which the first medium inflow portion 4 and the second medium outflow portion 7 are disposed at one end in the longitudinal direction of the heat transfer plate 2, and the first medium outflow portion 5 and the second medium inflow portion 6 are disposed at the other end in the longitudinal direction.
In the plate heat exchanger 1 shown on the left and right sides of fig. 7 of embodiment 5, the turn-back flow path extending from one end side to the other end side in the longitudinal direction of the heat transfer plate 2 and then extending from the other end side to the one end side and further extending from the one end side to the other end side is formed in the laminated space of the odd-numbered stages, and the non-turn-back flow path extending from the one end side to the other end side in the longitudinal direction of the heat transfer plate 2 is formed in the laminated space of the even-numbered stages. In the plate heat exchanger 1 shown on the left side of fig. 7, the first medium flows in from the first medium inflow portion 4, flows along the linear protrusions 8, exchanges heat with the second medium flowing in from the second medium inflow portion 6, turns back along the linear protrusions 8, exchanges heat with the second medium flowing out from the second medium outflow portion 7, and flows out from the first medium outflow portion 5. In the plate heat exchanger 1 shown on the right side of fig. 7, the first medium flows in from the first medium inflow portion 4, flows along the linear protrusions 8, exchanges heat with the second medium flowing out from the second medium outflow portion 7, turns back along the linear protrusions 8, exchanges heat with the second medium flowing in from the second medium inflow portion 6, and flows out from the first medium outflow portion 5.
Fig. 8 is a schematic view showing the temperatures in the flow path lengths of the first medium and the second medium in the plate heat exchanger 1 according to embodiment 5 shown in fig. 7A graph of the distribution. In the plate heat exchanger 1 shown on the left side of fig. 7, the temperature difference between the first medium and the second medium is largest at the second medium inflow portion 6, and the average temperature difference Δ T is defined by the following equation. Here, T1Temperature T of the first medium inflow part 4 which is the first medium2Temperature t of the first medium outflow part 5 which is the first medium1Temperature t of the second medium inflow part 6 as the second medium2The temperature of the second medium outflow portion 7 is the second medium.
[ mathematical formula 1]
In the plate heat exchanger 1 shown on the right side of fig. 7, the temperature difference between the first medium and the second medium is largest at the second medium inflow portion 6, and the average temperature difference Δ T is defined by the following equation.
[ mathematical formula 2]
As described above, since the temperature difference, the outlet temperature of the first medium, and the outlet temperature of the second medium are different between the plate heat exchanger 1 shown on the left side of fig. 7 and the plate heat exchanger 1 shown on the right side of fig. 7, the set temperature of the heat exchanger can be changed, and a design with a high degree of freedom corresponding to the target temperature can be performed.
The invention is not limited to the specific details and representative embodiments described and illustrated above. Modifications and effects that can be easily derived by those skilled in the art are also included in the present invention. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.
Description of the reference numerals
1 plate heat exchanger, 2 heat transfer plates, 3 chevron-shaped concavo-convex portions, 4 first-medium inflow portions, 5 first-medium outflow portions, 6 second-medium inflow portions, 7 second-medium outflow portions, 8 protrusions, and 9 protrusions.
Claims (9)
1. A plate heat exchanger for performing heat exchange using a plurality of heat transfer plates stacked,
the plurality of heat transfer plates include:
a first heat transfer plate that performs the heat exchange;
a second heat transfer plate in which a first stacking space for a first medium to flow is provided between the second heat transfer plate and the first heat transfer plate, and the second heat transfer plate is stacked to perform the heat exchange; and
a third heat transfer plate in which a second stacking space for a second medium to flow is provided between the third heat transfer plate and the second heat transfer plate and stacked to perform the heat exchange,
the first heat transfer plate, the second heat transfer plate, and the third heat transfer plate have the same shape, and each of the first heat transfer plate, the second heat transfer plate, and the third heat transfer plate includes:
a plate main body of a rectangular shape that performs the heat exchange;
a first medium inflow unit and a first medium outflow unit for allowing the first medium to flow in and flow out, or a second medium inflow unit and a second medium outflow unit for allowing the second medium to flow in and flow out; and
a protrusion that is in contact with one end side in the longitudinal direction of the plate main body and is separated from the other end side, and protrudes in the stacking direction to form a flow path for the first medium or the second medium,
the first medium outflow unit is disposed at a diagonal position with respect to the first medium inflow unit,
the second medium outflow portion is disposed at a diagonal position with respect to the second medium inflow portion,
a distance from the first medium inflow portion to the first medium outflow portion of the second heat plate along the projection of the second heat plate in the first stacked space is longer than a distance from the second medium inflow portion to the second medium outflow portion of the third heat plate along the projection of the third heat plate in the second stacked space.
2. A plate heat exchanger according to claim 1,
the first heat transfer plate and the second heat transfer plate are stacked such that the one end side of the first heat transfer plate is in contact with the other end side of the second heat transfer plate.
3. A plate heat exchanger according to claim 1 or 2,
the first medium inflow portion provided in the first heat transfer plate and the first medium inflow portion provided in the second heat transfer plate face each other with a space therebetween,
the second medium inflow portion provided in the first heat transfer plate is joined to the second medium inflow portion provided in the second heat transfer plate,
the second medium outflow portion provided in the second heat transfer plate and the second medium outflow portion provided in the third heat transfer plate face each other with a space therebetween,
the first medium outflow portion provided in the second heat transfer plate is joined to the first medium outflow portion provided in the third heat transfer plate.
4. A plate heat exchanger according to claim 1 or 2,
a change amount of a velocity vector from one of the two first medium inflow/outflow portions of the second heat transfer plate to the other along the projection of the second heat transfer plate in the first stacked space is larger than a change amount of a velocity vector from one of the two second medium inflow/outflow portions of the third heat transfer plate to the other along the projection of the third heat transfer plate in the second stacked space.
5. A plate heat exchanger according to claim 1 or 2,
the flow rate of the first medium in the first stacking space is smaller than the flow rate of the second medium in the second stacking space.
6. A plate heat exchanger according to claim 1 or 2,
the first heat transfer plate, the second heat transfer plate, and the third heat transfer plate each include another projection that is in contact with the other end side in the longitudinal direction of the plate body, is separated from the one end side, and projects in the stacking direction to form a flow path for the first medium or the second medium,
one of the first medium inflow portion and the first medium outflow portion is disposed at one of two corners located on the one end side of the plate main body separated from the other protrusion,
one of the second medium inflow portion and the second medium outflow portion is disposed at one of two corners located on the other end side of the plate main body where the other protrusion is in contact with,
the other of the first medium inflow portion and the first medium outflow portion is disposed at the other corner of the two corners located on the other end side of the plate main body where the other protrusion is in contact with,
the other of the second medium inflow portion and the second medium outflow portion is disposed at the other of the two corners located on the one end side of the plate main body separated by the other protrusion.
7. A plate heat exchanger according to claim 1 or 2,
wherein the first heat transfer plate, the second heat transfer plate, and the third heat transfer plate each have a chevron-shaped uneven portion that is tapered from the one end side toward the other end side in the longitudinal direction of the plate main body,
the protrusion is configured to divide the chevron shaped uneven portion.
8. A plate heat exchanger according to claim 1 or 2,
the plurality of heat transfer plates further includes a fourth heat transfer plate which is stacked with a third stacked space provided between the fourth heat transfer plate and the third heat transfer plate to perform the heat exchange,
the first heat transfer plate and the second heat transfer plate are stacked such that the first end side of the third heat transfer plate is in contact with the first end side of the fourth heat transfer plate.
9. A plate heat exchanger according to claim 1 or 2,
the opening area of the first medium inflow portion and the opening area of the first medium outflow portion are smaller than the opening area of the second medium inflow portion and the opening area of the second medium outflow portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-088287 | 2017-04-27 | ||
| JP2017088287 | 2017-04-27 | ||
| PCT/JP2017/044707 WO2018198420A1 (en) | 2017-04-27 | 2017-12-13 | Plate heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110537070A CN110537070A (en) | 2019-12-03 |
| CN110537070B true CN110537070B (en) | 2021-01-12 |
Family
ID=63918866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780089689.1A Active CN110537070B (en) | 2017-04-27 | 2017-12-13 | Plate heat exchanger |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20200041218A1 (en) |
| EP (1) | EP3598053B1 (en) |
| JP (1) | JP6479271B1 (en) |
| CN (1) | CN110537070B (en) |
| WO (1) | WO2018198420A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735070B (en) * | 2020-06-29 | 2022-07-15 | 浙江澄源环保科技有限公司 | Catalytic combustion equipment and catalytic combustion method for VOC gas |
| CN115183611B (en) * | 2022-09-08 | 2022-11-18 | 中国核动力研究设计院 | Heat exchange component |
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- 2017-12-13 EP EP17908036.1A patent/EP3598053B1/en active Active
- 2017-12-13 WO PCT/JP2017/044707 patent/WO2018198420A1/en unknown
- 2017-12-13 CN CN201780089689.1A patent/CN110537070B/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3598053B1 (en) | 2022-05-11 |
| JPWO2018198420A1 (en) | 2019-06-27 |
| WO2018198420A1 (en) | 2018-11-01 |
| CN110537070A (en) | 2019-12-03 |
| EP3598053A4 (en) | 2020-03-18 |
| US20200041218A1 (en) | 2020-02-06 |
| EP3598053A1 (en) | 2020-01-22 |
| JP6479271B1 (en) | 2019-03-06 |
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