US20110209861A1 - Method of manufacturing plate heat exchanger and plate heat exchanger - Google Patents
Method of manufacturing plate heat exchanger and plate heat exchanger Download PDFInfo
- Publication number
- US20110209861A1 US20110209861A1 US13/029,565 US201113029565A US2011209861A1 US 20110209861 A1 US20110209861 A1 US 20110209861A1 US 201113029565 A US201113029565 A US 201113029565A US 2011209861 A1 US2011209861 A1 US 2011209861A1
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- United States
- Prior art keywords
- wave
- plate
- heat exchanger
- plates
- plate heat
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
- B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
- B21D13/10—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form into a peculiar profiling shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/04—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of sheet metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0012—Brazing heat exchangers
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2275/00—Fastening; Joining
- F28F2275/04—Fastening; Joining by brazing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4935—Heat exchanger or boiler making
- Y10T29/49393—Heat exchanger or boiler making with metallurgical bonding
Definitions
- joint portions are formed near each inlet and outlet by making part of the ridge lines of the wave patterns meander or bend (e.g., Patent Literature 1).
- the problems include increased susceptibility to fractures at the time of molding and decreased accuracy in size after molding, due to unevenness of stretch at meandered or bent portions of the plates at the time of molding. It has also been a problem that the cost of manufacture of molds for molding the plates is increased due to complexity of the wave patterns.
- indentations having a depth of 0.05 mm to 0.1 mm are formed at joint portions of wave patterns provided in each plate by applying pressure to a plurality of stacked plates before brazing, in order to increase the contact area between wave patterns to be joined.
- the area of joint portions joined by brazing is increased. It is aimed to provide a method of manufacturing a plate heat exchanger with excellent reliability in molding the plates, by using a mold that has increased strength and requires no complex processing because of this increased joint area.
- the plate heat exchanger includes a plurality of plates stacked and configured in a rectangular shape having a long side and a short side, each of the plurality of plates having formed therein a wave pattern waving in a stacking direction, wherein
- FIG. 1 is a plan view of a plate heat exchanger 100 according to a first embodiment.
- FIG. 3 is a view corresponding to a cross sectional view taken on the line A-A of the plate heat exchanger 100 of the first embodiment (before applying pressure).
- FIG. 7 is a cross sectional view taken on the line B-B of the plate heat exchanger 100 of the second embodiment before applying pressure.
- FIG. 8 is a cross sectional view taken on the line B-B of the plate heat exchanger 100 of the second embodiment after applying pressure.
- FIGS. 1 to 5 a method of manufacturing a plate heat exchanger 100 according to a first embodiment will be described.
- FIG. 1 is a plan view of the plate heat exchanger 100 .
- the configuration of the plate heat exchanger 100 is approximately the same as that of a conventional plate heat exchanger.
- the difference from the conventional plate heat exchanger lies in that a height difference of “0.05 mm to 0.1 mm” is provided in the height of wave patterns, as shown in FIG. 3 to be described later, and this height difference is offset by a pressure process to be described later in order to enlarge brazing portions between crest portions and trough portions on adjoining plates.
- the plate heat exchanger 100 includes a plurality of plates stacked and configured in a rectangular shape having long sides 102 a and 102 b and short sides 101 a and 101 b .
- wave patterns waving in a stacking direction are formed.
- a lower side plate and an upper side plate adjacent to each other have between them a plurality of intersecting portions 105 at intersections of a plurality of bottom ridge lines 106 representing the bottom of the wave of the upper side plate and a plurality of top ridge lines 107 representing the top of the wave of the lower side plate.
- the bottom of the wave of the upper side plate and the top of the wave of the lower side plate are joined by a brazing process at the plurality of the intersecting portions 105 .
- a cooling medium inlet 111 for passing a cooling medium and a heating medium outlet 112 (an opening) for passing a heating medium for heat exchange with the cooling medium are formed across the short side.
- a cooling medium outlet 113 for passing the cooling medium and a heating medium inlet 114 (an opening) for passing the heating medium are formed across the short side.
- the wave patterns are formed in an area between a pair of the cooling medium inlet 111 and the heating medium outlet 112 and a pair of the cooling medium outlet 113 and the heating medium inlet 114 .
- the configuration of the plate heat exchanger 100 described so far is the same as that of the conventional plate heat exchanger.
- FIG. 2 is a cross sectional view of the conventional plate heat exchanger corresponding to the cross section A-A of FIG. 1 .
- the cross section of FIG. 2 shows the plurality of plates stacked in a stacking direction 104 .
- crest portions 3 (top) of the wave patterns formed in one of the plates are in contact with trough portions 4 (bottom) of the wave patterns formed in the other plate at contact points 5 .
- the cross section of the crest portions 3 or the trough portions 4 of the wave patterns formed in the plates 1 and 2 is shaped in an approximately circular arc.
- the ridge lines of the respective wave patterns of the plates 1 and 2 are formed in mutually intersecting directions, so that the contact points 5 (corresponding to intersecting portions) between the two plates are in point contact.
- FIG. 3 shows a cross section of the plate heat exchanger 100 corresponding to the cross section A-A of FIG. 1 before the “pressure process” to be described later.
- FIG. 3 shows both the areas 6 a and 6 b and the area other than the areas 6 a and 6 b .
- FIG. 3 does not show the actual cross section A-A.
- the plates of the plate heat exchanger 100 are characterized in that, as shown in FIG.
- a wave height H 1 of the wave patterns in the area 6 a near the cooling medium inlet 111 and the heating medium outlet 112 (area near the openings) and the area 6 b near the cooling medium outlet 113 and the heating medium inlet 114 (area near the openings) is higher (longer) by a “size a” compared to a wave height H 2 of the wave patterns in the other area (area other than the areas 6 a and 6 b ).
- each plate is characterized in that a bottom position 121 of the wave in a direction from the upper side to the lower side of the stacking direction 104 in the areas 6 a and 6 b is lower by the “size a” than a bottom position 122 of the wave in the area other than the areas 6 a and 6 b.
- the plate 1 (lower side plate) and the plate 2 (upper side plate) are manufactured by press molding.
- the above range “0.05 mm to 0.1 mm” of the “size a” can be realized by press molding the plates 1 and 2 in a mold for molding the plates 1 and 2 configured to produce a difference corresponding to “0.05 mm to 0.1 mm” in the height of a place where the wave patterns are molded.
- the plates 1 and 2 are configured as described above.
- the crest portions of the wave patterns provided in one of the plates are in point contact with the trough portions of the wave patterns of the other plate at contact points 9 in the areas 6 a and 6 b near each inlet and outlet.
- wave-patterned portions in the other area have gaps 10 of 0.05 mm to 0.1 mm between the two plates.
- the top position of the wave at the upper side may be higher by the “size a” in an upward direction in the areas 6 a and 6 b.
- FIG. 4 is a view showing the pressure process.
- FIG. 5 shows a state of FIG. 3 after the pressure process.
- the depth of the indentations 11 formed by applying pressure should be a depth that approximately offsets the “size a” (0.05 mm to 0.1 mm), i.e., a predetermined difference between the wave height of the wave patterns in the areas 6 a and 6 b near each inlet and outlet and the wave height of the wave patterns in the other area. This is approximately enough to close the gaps 10 in the area not near each inlet and outlet.
- the plates are configured to have the indentations 11 to make them fit together.
- the plates are taken out of the pressure jigs 16 a and 16 b to relieve the applied pressure.
- the plates are brazed by furnace brazing or the like, without changing the stacked order at the time of applying pressure.
- the plate heat exchanger 100 is configured such that, in the wave patterns formed in each plate, the wave height of the wave patterns near each inlet and outlet of the heating medium and the cooling medium is higher by “0.05 mm to 0.1 mm” than the wave height of the wave patterns in the other area, in order to increase the area of joint portions joined by a brazing material in the wave patterns near each inlet and outlet of the heating medium and the cooling medium compared to the area of joint portions joined by the brazing material in the other area. Then, before brazing, a predetermined number of these plates are stacked and pressure is applied to the stacked plates by using the pressure jigs. Brazing is performed after this pressure process has formed indentations approximately enough to offset the difference in the height of the wave patterns.
- the molds for molding the plates can be manufactured inexpensively. Also, in the molding of the plates, the cost of manufacture can be reduced because fracture failures are less likely to occur, and so on.
- the indentations 11 are formed near each inlet and outlet by applying pressure, in order to increase the area joined by brazing and enhance the joint strength.
- the second embodiment will describe a case in which the strength is enhanced over the entire area of the plates.
- FIG. 6 is a schematic view of the plate heat exchanger 100 according to the second embodiment.
- FIG. 7 is a view showing the cross section B-B of FIG. 6 of a plurality of stacked plates before applying pressure.
- FIG. 8 is a view showing the cross section B-B of FIG. 6 of the plurality of stacked plates after applying pressure.
- a wave height 13 of the wave patterns formed in the plates 1 and 2 is ideally approximately uniform over an entire area 12 of the plates.
- the wave height 13 includes variations occurring when the plates 1 and 2 are press molded. This causes gaps 14 at contact portions of adjoining wave patterns at places where the wave height 13 is relatively low. Performing brazing in this state tends to reduce the area of joint portions joined by the brazing material at contact portions of the wave patterns where gaps exist. This state occurs at a large number of arbitrary places over the entire area 12 of the plates 1 and 2 . At these places, variations occur in the area of joint portions joined by the brazing material, causing variations in the strength of the plate heat exchanger.
- a required number of the plates 1 and 2 are stacked before being brazed. Then, as with the first embodiment as shown in FIG. 4 , pressure is applied to approximately the entire area of the plates 1 and 2 by using the pressure jigs 16 a and 16 b having a flat surface, while maintaining the parallel positions of the lower and upper surfaces. This causes plastic deformation at the contact portions of the wave patterns over approximately the entire area. As a result, indentations 15 are formed at the contact portions in both of adjoining lower and upper plates, so that the contact state changes to area contact from point contact of before applying pressure.
- the depth of the indentations 15 formed by applying pressure such that the depth approximately offsets the gaps 14 caused by variations in the wave height 13 , the gaps 14 are closed.
- the appropriate depth of the indentations 15 in this case is “0.05 mm to 0.1 mm”, considering the level of variations in the wave height 13 caused by press molding.
- the plates are configured to have indentations 15 to make them fit together.
- the plates are taken out of the pressure jigs 16 a and 16 b to relieve the applied pressure.
- the plates are brazed by furnace brazing or the like, without changing the stacked order at the time of applying pressure. In this way, the area of joint portions joined by the brazing material can be increased over approximately the entire area of the plate heat exchanger.
- the gaps 14 caused by variations in the wave height 13 can be closed by applying pressure with the pressure jigs 16 a and 16 b .
- variations in the area of joint portions can also be decreased.
- the joint strength can be increased, and variations in the joint strength can also be decreased, thereby leading to consistency and enhancement of the quality of the plate heat exchanger in terms of strength.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
In a plate heat exchanger, it is aimed to enhance strength, such as the pressure resistance and the internal pressure fatigue resistance, by increasing the joint area of a joint portion joined by brazing in a wave-patterned portion. Before a brazing process of the plate heat exchanger, a plurality of plates are stacked and pressure is applied thereto. By this pressure process, indentations of approximately “0.05 mm to 0.1 mm” are formed at contact points 9 of wave patterns in adjoining lower and upper plates. By brazing the plates after this pressure process, the joint area of the joint portion joined by brazing is increased. The increased joint area enhances the joint strength, and thus the strength of the plate heat exchanger such as the pressure resistance and the internal pressure fatigue resistance can be enhanced.
Description
- This invention relates to a method of manufacturing a plate heat exchanger and a plate heat exchanger.
- A plate heat exchanger includes stacked plates, in each of which a plurality of wave patterns are formed on each heat-transfer surface in order to provide flow passages for a heating medium and a cooling medium (also called a refrigerant). The plates are configured such that part of crest portions of the wave patterns in one of two adjoining plates are in contact with part of trough portions of the wave patterns in the other plate. These contact portions are joined by brazing, and such joint portions are formed over the entire area of each plate, thereby maintaining strength.
- On the other hand, near each inlet and outlet of the heating medium and the cooling medium provided in each plate, there is an area where no joint portion of the wave patterns described above can be created because of the need to completely separate the heating medium and the cooling medium. Because of this area, strength is reduced near each inlet and outlet compared to the other area.
- Thus, in some conventional heat exchangers, joint portions are formed near each inlet and outlet by making part of the ridge lines of the wave patterns meander or bend (e.g., Patent Literature 1).
-
- Patent Literature 1: JP 7-243781 A
- However, in a configuration where part of the ridge lines of the wave patterns is made to meander or bend, there have been problems. The problems include increased susceptibility to fractures at the time of molding and decreased accuracy in size after molding, due to unevenness of stretch at meandered or bent portions of the plates at the time of molding. It has also been a problem that the cost of manufacture of molds for molding the plates is increased due to complexity of the wave patterns.
- In this invention, indentations having a depth of 0.05 mm to 0.1 mm are formed at joint portions of wave patterns provided in each plate by applying pressure to a plurality of stacked plates before brazing, in order to increase the contact area between wave patterns to be joined. By performing brazing in this state, the area of joint portions joined by brazing is increased. It is aimed to provide a method of manufacturing a plate heat exchanger with excellent reliability in molding the plates, by using a mold that has increased strength and requires no complex processing because of this increased joint area.
- In a method of manufacturing a plate heat exchanger according to this invention, the plate heat exchanger includes a plurality of plates stacked and configured in a rectangular shape having a long side and a short side, each of the plurality of plates having formed therein a wave pattern waving in a stacking direction, wherein
- when one side of the stacking direction is defined as a lower side and an other side is defined as an upper side, a lower side plate and an upper side plate adjacent to each other have between them a plurality of intersecting portions at intersections of a plurality of bottom ridge lines representing a bottom of a wave of the upper side plate and a plurality of top ridge lines representing a top of a wave of the lower side plate, and the bottom of the wave of the upper side plate and the top of the wave of the lower side plate are joined by a brazing process at the plurality of intersecting portions, and
- the method of manufacturing the plate heat exchanger includes:
- a pressure process of forming indentations on the bottom of the wave of the upper side plate and the top of the wave of the lower side plate at least at some of the plurality of intersecting portions by stacking the plurality of plates before the brazing process in a same order as in a completed state and applying pressure thereto in the stacking direction to compress the plurality of stacked plates.
- This invention can provide a plate heat exchanger to be joined by brazing that is easy to manufacture and offers enhanced pressure resistance performance.
-
FIG. 1 is a plan view of aplate heat exchanger 100 according to a first embodiment. -
FIG. 2 is a cross sectional view of a conventional plate heat exchanger corresponding to the cross section A-A ofFIG. 1 . -
FIG. 3 is a view corresponding to a cross sectional view taken on the line A-A of theplate heat exchanger 100 of the first embodiment (before applying pressure). -
FIG. 4 is a view showing a pressure process of the first embodiment. -
FIG. 5 is a view showingFIG. 3 after applying pressure. -
FIG. 6 is a plan view of theplate heat exchanger 100 of a second embodiment. -
FIG. 7 is a cross sectional view taken on the line B-B of theplate heat exchanger 100 of the second embodiment before applying pressure. -
FIG. 8 is a cross sectional view taken on the line B-B of theplate heat exchanger 100 of the second embodiment after applying pressure. - Referring to
FIGS. 1 to 5 , a method of manufacturing aplate heat exchanger 100 according to a first embodiment will be described. -
FIG. 1 is a plan view of theplate heat exchanger 100. The configuration of theplate heat exchanger 100 is approximately the same as that of a conventional plate heat exchanger. The difference from the conventional plate heat exchanger lies in that a height difference of “0.05 mm to 0.1 mm” is provided in the height of wave patterns, as shown inFIG. 3 to be described later, and this height difference is offset by a pressure process to be described later in order to enlarge brazing portions between crest portions and trough portions on adjoining plates. - (Configuration of the Plate Heat Exchanger 100)
- The
plate heat exchanger 100 includes a plurality of plates stacked and configured in a rectangular shape havinglong sides short sides plate heat exchanger 100, when one side of the stacking direction is defined as a lower side and the other side is defined as an upper side, a lower side plate and an upper side plate adjacent to each other have between them a plurality of intersectingportions 105 at intersections of a plurality ofbottom ridge lines 106 representing the bottom of the wave of the upper side plate and a plurality oftop ridge lines 107 representing the top of the wave of the lower side plate. Then, the bottom of the wave of the upper side plate and the top of the wave of the lower side plate are joined by a brazing process at the plurality of the intersectingportions 105. - In each plate of the
plate heat exchanger 100, near oneshort side 101 a, a cooling medium inlet 111 (an opening) for passing a cooling medium and a heating medium outlet 112 (an opening) for passing a heating medium for heat exchange with the cooling medium are formed across the short side. Near the othershort side 101 b, a cooling medium outlet 113 (an opening) for passing the cooling medium and a heating medium inlet 114 (an opening) for passing the heating medium are formed across the short side. The wave patterns are formed in an area between a pair of thecooling medium inlet 111 and theheating medium outlet 112 and a pair of thecooling medium outlet 113 and theheating medium inlet 114. - The configuration of the
plate heat exchanger 100 described so far is the same as that of the conventional plate heat exchanger. -
FIG. 2 is a cross sectional view of the conventional plate heat exchanger corresponding to the cross section A-A ofFIG. 1 . - (Cross Section of the Conventional Plate Heat Exchanger)
- The cross section of
FIG. 2 shows the plurality of plates stacked in astacking direction 104. In two adjoining lower andupper plates contact points 5. The cross section of thecrest portions 3 or thetrough portions 4 of the wave patterns formed in theplates plates - (Characteristic of the Plates of the Plate Heat Exchanger 100)
-
FIG. 3 shows a cross section of theplate heat exchanger 100 corresponding to the cross section A-A ofFIG. 1 before the “pressure process” to be described later. For the purpose of explanation,FIG. 3 shows both theareas areas FIG. 3 does not show the actual cross section A-A. The plates of theplate heat exchanger 100 are characterized in that, as shown inFIG. 3 , a wave height H1 of the wave patterns in thearea 6 a near thecooling medium inlet 111 and the heating medium outlet 112 (area near the openings) and thearea 6 b near thecooling medium outlet 113 and the heating medium inlet 114 (area near the openings) is higher (longer) by a “size a” compared to a wave height H2 of the wave patterns in the other area (area other than theareas - Here, the “size a” is defined as follows:
- 0.05 mm≦a≦0.1 mm
- As described above, each plate is characterized in that a
bottom position 121 of the wave in a direction from the upper side to the lower side of thestacking direction 104 in theareas bottom position 122 of the wave in the area other than theareas - The plate 1 (lower side plate) and the plate 2 (upper side plate) are manufactured by press molding. The above range “0.05 mm to 0.1 mm” of the “size a” can be realized by press molding the
plates plates - The
plates FIG. 3 , when a plurality of theplates FIG. 1 , between two adjoining lower andupper plates contact points 9 in theareas gaps 10 of 0.05 mm to 0.1 mm between the two plates. - Referring to the plate 2-1 in
FIG. 3 , although thebottom position 121 of the wave in theareas areas areas - (Pressure Process)
-
FIG. 4 is a view showing the pressure process. -
FIG. 5 shows a state ofFIG. 3 after the pressure process. - Before the brazing process, a required number of the
plates FIG. 4 , pressure is applied to approximately the entire area of theplates FIG. 5 , this pressure process causes plastic deformation at the contact points 9 (contact points between the top and the bottom) of the wave patterns in theareas - In this way, before the brazing process, a plurality of the plates are stacked in the same order as in a completed state. Then, by applying pressure in the stacking direction to compress the plurality of the stacked plates, indentations are formed on the bottom of the wave of the upper side plate and the top of the wave of the lower side plate at least at some of a plurality of the contact points (intersecting portions).
- (Depth of Indentations)
- At this time, the depth of the indentations 11 formed by applying pressure should be a depth that approximately offsets the “size a” (0.05 mm to 0.1 mm), i.e., a predetermined difference between the wave height of the wave patterns in the
areas gaps 10 in the area not near each inlet and outlet. Also, by configuring a “size 6 a-w” and a “size 6 b-w” of theareas - By stacking the
plates - As presented above, the
plate heat exchanger 100 is configured such that, in the wave patterns formed in each plate, the wave height of the wave patterns near each inlet and outlet of the heating medium and the cooling medium is higher by “0.05 mm to 0.1 mm” than the wave height of the wave patterns in the other area, in order to increase the area of joint portions joined by a brazing material in the wave patterns near each inlet and outlet of the heating medium and the cooling medium compared to the area of joint portions joined by the brazing material in the other area. Then, before brazing, a predetermined number of these plates are stacked and pressure is applied to the stacked plates by using the pressure jigs. Brazing is performed after this pressure process has formed indentations approximately enough to offset the difference in the height of the wave patterns. - Thus, because of the indentations 11, area contact occurs at the contact points 9 in the
areas areas plates - Further, since there are no meandering portions, bending portions, or the like, the molds for molding the plates can be manufactured inexpensively. Also, in the molding of the plates, the cost of manufacture can be reduced because fracture failures are less likely to occur, and so on.
- Next, referring to
FIGS. 6 to 8 , a method of manufacturing theplate heat exchanger 100 according to a second embodiment will be described. In the first embodiment described above, the indentations 11 are formed near each inlet and outlet by applying pressure, in order to increase the area joined by brazing and enhance the joint strength. The second embodiment will describe a case in which the strength is enhanced over the entire area of the plates. -
FIG. 6 is a schematic view of theplate heat exchanger 100 according to the second embodiment. -
FIG. 7 is a view showing the cross section B-B ofFIG. 6 of a plurality of stacked plates before applying pressure. -
FIG. 8 is a view showing the cross section B-B ofFIG. 6 of the plurality of stacked plates after applying pressure. - In
FIGS. 6 and 7 , awave height 13 of the wave patterns formed in theplates entire area 12 of the plates. In actuality, however, thewave height 13 includes variations occurring when theplates gaps 14 at contact portions of adjoining wave patterns at places where thewave height 13 is relatively low. Performing brazing in this state tends to reduce the area of joint portions joined by the brazing material at contact portions of the wave patterns where gaps exist. This state occurs at a large number of arbitrary places over theentire area 12 of theplates - (Pressure Process)
- To solve the above problem, a required number of the
plates FIG. 4 , pressure is applied to approximately the entire area of theplates indentations 15 are formed at the contact portions in both of adjoining lower and upper plates, so that the contact state changes to area contact from point contact of before applying pressure. Also, by configuring the depth of theindentations 15 formed by applying pressure such that the depth approximately offsets thegaps 14 caused by variations in thewave height 13, thegaps 14 are closed. The appropriate depth of theindentations 15 in this case is “0.05 mm to 0.1 mm”, considering the level of variations in thewave height 13 caused by press molding. - In this way, before the brazing process, a plurality of the plates are stacked in the same order as in the completed state. Then, by applying pressure in the stacking direction to compress the plurality of the stacked plates, indentations are formed on the bottom of the wave of the upper side plate and the top of the wave of the lower side plate at least at some of a plurality of the contact points (intersecting portions).
- By stacking the
plates indentations 15 to make them fit together. In this state, the plates are taken out of the pressure jigs 16 a and 16 b to relieve the applied pressure. Then, the plates are brazed by furnace brazing or the like, without changing the stacked order at the time of applying pressure. In this way, the area of joint portions joined by the brazing material can be increased over approximately the entire area of the plate heat exchanger. - Further, by configuring the
gaps 14 caused by variations in thewave height 13 to be closed by applying pressure with the pressure jigs 16 a and 16 b, variations in the area of joint portions can also be decreased. Thus the joint strength can be increased, and variations in the joint strength can also be decreased, thereby leading to consistency and enhancement of the quality of the plate heat exchanger in terms of strength. - At the time of furnace brazing, other internal parts of the plate heat exchanger to be joined with the
plates plates -
- 1: plate, 2: plate, 3: crest portions of the wave patterns, 4: trough portions of the wave patterns, 5: contact points, 6 a, 6 b: areas near each inlet and outlet, 7: wave height, 8: wave height, 9: contact points, 10: gaps, 11: indentations, 12: entire area of the plate, 13: wave height of the wave patterns, 14: gaps, 15: indentations, 16 a, 16 b: pressure jigs, 100: plate heat exchanger, 101: short sides, 102: long sides, 104: stacking direction, 105: intersecting portions, 106: bottom ridge lines, 107: top ridge lines, 111: cooling medium inlet, 112: heating medium outlet, 113: cooling medium outlet, 114: heating medium inlet, 121, 122: bottom positions
Claims (6)
1. A method of manufacturing a plate heat exchanger, the plate heat exchanger including a plurality of plates stacked and configured in a rectangular shape having a long side and a short side, each of the plurality of plates having formed therein a wave pattern waving in a stacking direction, wherein
when one side of the stacking direction is defined as a lower side and an other side is defined as an upper side, a lower side plate and an upper side plate adjacent to each other have between them a plurality of intersecting portions at intersections of a plurality of bottom ridge lines representing a bottom of a wave of the upper side plate and a plurality of top ridge lines representing a top of a wave of the lower side plate, and the bottom of the wave of the upper side plate and the top of the wave of the lower side plate are joined by a brazing process at the plurality of intersecting portions,
the method of manufacturing the plate heat exchanger, comprising:
a pressure process of forming indentations on the bottom of the wave of the upper side plate and the top of the wave of the lower side plate at least at some of the plurality of intersecting portions by stacking the plurality of plates before the brazing process in a same order as in a completed state and applying pressure thereto in the stacking direction to compress the plurality of stacked plates.
2. The method of manufacturing the plate heat exchanger of claim 1 , wherein
each plate of the plurality of plates has formed therein, near each of the short side at both ends, two openings arranged side by side across the short side, and the each plate also has formed therein the wave pattern between both pairs of the two openings respectively formed near the each of the short side at both ends, and,
in the wave pattern on the each plate of the plurality of plates, a distance H1 of the stacking direction between the bottom of the wave and the top of the wave of the wave pattern in an area near the openings, which is an area near each of the two pairs of the two openings, is longer by a “size a” than a distance H2 of the stacking direction between the bottom of the wave and the top of the wave of the wave pattern in an area other than the area near the openings, and
the pressure process forms the indentations that approximately offset the “size a”.
3. The method of manufacturing the plate heat exchanger of claim 2 , wherein
in the each plate, a bottom position of the wave in a direction from the upper side to the lower side of the stacking direction in the area near the openings is lower by the “size a” toward the lower side than a bottom position of the wave in the direction from the upper side to the lower side of the stacking direction in the area other than the area near the openings.
4. The method of manufacturing the plate heat exchanger of claim 2 , wherein
in the each plate, a top position of the wave in a direction from the lower side to the upper side of the stacking direction in the area near the openings is higher by the “size a” toward the upper side than a top position of the wave in the direction from the lower side to the upper side of the stacking direction in the area other than the area near the openings.
5. The method of manufacturing the plate heat exchanger of claim 2 , wherein
the “size a” is 0.05 mm≦a≦0.1 mm.
6. A plate heat exchanger including a plurality of plates stacked and configured in a rectangular shape having a long side and a short side, each of the plurality of plates having formed therein a wave pattern waving in a stacking direction,
wherein when one side of the stacking direction is defined as a lower side and an other side is defined as an upper side, a lower side plate and an upper side plate adjacent to each other have between them a plurality of intersecting portions at intersections of a plurality of bottom ridge lines representing a bottom of a wave of the upper side plate and a plurality of top ridge lines representing a top of a wave of the lower side plate, and the bottom of the wave of the upper side plate and the top of the wave of the lower side plate are joined at the plurality of intersecting portions, and
wherein indentations are formed on the bottom of the wave of the upper side plate and the top of the wave of the lower side plate at least at some of the plurality of intersecting portions.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010041185A JP5733900B2 (en) | 2010-02-26 | 2010-02-26 | Manufacturing method of plate heat exchanger and plate heat exchanger |
JP2010-041185 | 2010-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110209861A1 true US20110209861A1 (en) | 2011-09-01 |
Family
ID=44064974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/029,565 Abandoned US20110209861A1 (en) | 2010-02-26 | 2011-02-17 | Method of manufacturing plate heat exchanger and plate heat exchanger |
Country Status (4)
Country | Link |
---|---|
US (1) | US20110209861A1 (en) |
EP (1) | EP2363677B1 (en) |
JP (1) | JP5733900B2 (en) |
CN (1) | CN102166678A (en) |
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US20130126135A1 (en) * | 2010-06-24 | 2013-05-23 | Alfa Laval Corporate Ab | Heat exchanger plate and a plate heat exchanger |
US20140360224A1 (en) * | 2013-06-05 | 2014-12-11 | Hamilton Sundstrand Corporation | Evaporator Heat Exchanger |
US9933214B2 (en) | 2011-11-30 | 2018-04-03 | Mitsubishi Electric Corporation | Plate heat exchanger and refrigeration cycle apparatus including the same |
US20190236580A1 (en) * | 2015-12-22 | 2019-08-01 | Nti, Inc. | Settlement system, user terminal and method executed thereby, settlement device and method executed thereby, and program |
US20200166293A1 (en) * | 2018-11-27 | 2020-05-28 | Hamilton Sundstrand Corporation | Weaved cross-flow heat exchanger and method of forming a heat exchanger |
CN114341584A (en) * | 2019-09-13 | 2022-04-12 | 阿法拉伐股份有限公司 | Plate heat exchanger for treatment of liquid feed |
US11441854B2 (en) * | 2016-04-25 | 2022-09-13 | Novares France | Heat exchanger made of plastic material and vehicle including this heat exchanger |
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US9057564B2 (en) * | 2012-12-17 | 2015-06-16 | Baltimore Aircoil Company, Inc. | Cooling tower with indirect heat exchanger |
CN105737646A (en) * | 2016-03-11 | 2016-07-06 | 江苏远卓设备制造有限公司 | Plate heat exchanger and manufacturing technology thereof |
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Also Published As
Publication number | Publication date |
---|---|
EP2363677A3 (en) | 2013-07-31 |
JP5733900B2 (en) | 2015-06-10 |
EP2363677A2 (en) | 2011-09-07 |
EP2363677B1 (en) | 2014-09-24 |
JP2011174689A (en) | 2011-09-08 |
CN102166678A (en) | 2011-08-31 |
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