US20040182558A1 - Header for use in heat exchanger, heat exchanger and method for manufacturing the same - Google Patents
Header for use in heat exchanger, heat exchanger and method for manufacturing the same Download PDFInfo
- Publication number
- US20040182558A1 US20040182558A1 US10/472,486 US47248604A US2004182558A1 US 20040182558 A1 US20040182558 A1 US 20040182558A1 US 47248604 A US47248604 A US 47248604A US 2004182558 A1 US2004182558 A1 US 2004182558A1
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- Prior art keywords
- wall
- base wall
- header
- reinforcing
- opposite
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- Abandoned
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 31
- 238000003780 insertion Methods 0.000 claims abstract description 207
- 230000037431 insertion Effects 0.000 claims abstract description 207
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 173
- 238000005452 bending Methods 0.000 claims abstract description 92
- 238000005219 brazing Methods 0.000 claims description 18
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000009751 slip forming Methods 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 abstract description 7
- 238000005304 joining Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 230000008901 benefit Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
-
- 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
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
- F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
- F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
- F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/0202—Header boxes having their inner space divided by partitions
- F28F9/0204—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions
- F28F9/0214—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions having only longitudinal partitions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2225/00—Reinforcing means
- F28F2225/08—Reinforcing means for header boxes
Definitions
- the present invention relates to a header suitably used for a heat exchanger such as a condenser and an evaporator for use in a refrigeration system for an automobile air-conditioner, and also relates to a method for manufacturing the header.
- header-type heat exchanger which is provided with a pair of headers and a plurality of heat exchanging tubes disposed in parallel with each other between the headers with opposite ends thereof communicated with the headers, is widely used.
- a pipe having a round cross-section is widely used as a header.
- a header having a flat cross-section such as an elliptical cross-section, an oval cross-section or a rectangular cross-section.
- This header 1 includes two members, that is, a first peripheral wall member 2 and a second peripheral wall member 3 .
- the first peripheral wall member 2 includes a base wall 2 a in which a plurality of tube insertion apertures 2 c are formed at predetermined intervals along the longitudinal direction of the base wall 2 a and a pair of joining portions 2 b and 2 b provided at lateral sides of the base wall 2 a .
- the second peripheral wall member 3 includes an opposite wall 3 a ) to be opposed the base wall 2 a and a pair of side walls 3 b and 3 b formed along the lateral sides of the opposite wall 3 a.
- the first peripheral wall member 2 and the second peripheral wall member 3 are coupled together, and the side walls 3 b and 3 b are joined to the joining portions 2 b and 2 b by pinching processing or brazing processing, thereby forming a header 1 .
- a plurality of heat exchanging tubes 5 disposed in parallel with each other are inserted into corresponding tube insertion apertures 2 c and fixed therein to thereby fabricate a header-type heat exchanger.
- the thickness of the peripheral wall member 2 and 3 becomes smaller in accordance with the request that the header be smaller in size and lighter in weight. Therefore, it is difficult to secure predetermined pressure resistance only by the peripheral wall members 2 and 3 . To cope with the problems, it is considered to provide a reinforcing partition 4 in the header 1 as shown by the phantom line.
- this header 1 having the aforementioned configuration cannot be manufactured by using an electric resistance weld pipe and therefore has to be manufactured by welding or pinching the wall members 2 and 3 .
- This causes not only a complicated configuration but also an increased number of parts, resulting in complicated assembling operation and an increased manufacturing cost.
- the reinforcing partition 4 is assembled within the header 1 , it is necessary to form a number of cut-out portions 4 a in the partition 4 by machining processing or the like so as not to impede the insertion of the heat exchanging tube 5 into the header 1 .
- This requires an adoption of troublesome machining processing and increases the number of processing steps, which in turn increases the manufacturing cost.
- a header for use in heat exchangers includes a base wall with a plurality of tube insertion apertures for inserting heat exchanging tubes formed at predetermined intervals in a longitudinal direction of the base wall, an opposite wall opposed to the base wall, a pair of side walls disposed at both lateral sides of the base wall and the opposite wall and connecting the lateral sides, and a reinforcing wall disposed between the base wall and the opposite wall along a longitudinal direction thereof and connecting the base wall to the opposite wall.
- the side walls are integrally formed at both lateral sides of the base wall by bending processing.
- a first half of the opposite wall constituting one half of the opposite wall is integrally formed at a side of one of the side walls by bending processing.
- a second half of the opposite wall constituting the other half of the opposite wall is integrally formed at a side of the other of the side walls by bending processing.
- the reinforcing wall is integrally formed at at least one of sides of the first half of the opposite wall and the second half of the opposite wall by bending processing.
- the base wall, the side walls, the opposite wall and the reinforcing wall are integrally formed by bending processing, it is not required to perform joining processing of these members, such as brazing processing or pinching processing, and it becomes possible to reduce the number of parts. Furthermore, since the reinforcing wall is disposed between the base wall and the opposite wall, it is possible to assuredly obtain sufficient strength against the inner pressure.
- the reinforcing wall is formed at each side of the first half of the opposite wall and the second half of the opposite wall. In this case, since there are two reinforcing walls, it becomes possible to further enhance the pressure resistance.
- a side edge of the reinforcing wall opposed to the base wall is integrally brazed to the base wall.
- the reinforcing wall is provided with tube engaging cut-out portions formed at positions corresponding to the plurality of tube insertion apertures, whereby each end of the plurality of heat exchanging tubes inserted into the tube insertion apertures is engaged with the tube engaging cut-out portion in a positioned manner.
- the tube insertion amount adjustment can be performed more easily and accurately, and the tube insertion operation can be performed smoothly.
- the reinforcing wall is provided with insertion ledges at the side edge thereof opposed to the base wall, and the base wall is provided with insertion ledge engaging apertures at positions corresponding to the insertion ledges, and the insertion ledges are inserted into the insertion ledge engaging apertures and engaged therewith.
- the insertion ledges of the reinforcing wall are engaged with and fixed to the insertion ledge engaging apertures, it becomes possible to avoid problems such as springback.
- the provisional assembly can be maintained stably after the bending processing until the brazing processing, which enables to maintain the high dimensional accuracy.
- the insertion ledges are integrally brazed to the base wall with the insertion ledges inserted into the insertion ledge engaging apertures.
- a peripheral edge of the tube insertion aperture is inwardly bent.
- the heat exchanging tube is guided smoothly by the peripheral edge of the tube insertion aperture at the time of inserting the tube into the tube insertion aperture. Therefore, the tube insertion operation can be performed more easily. Furthermore, the joining area between the tube and the tube insertion aperture can be kept larger, which in turn enables to obtain reliable air-tightness of the joined portion.
- a header for use in heat exchangers the header comprises:
- reinforcing wall is integrally formed at respective sides of the first half of the opposite wall and the second half of the opposite wall by bending processing
- insertion ledges are formed at certain intervals in a longitudinal direction of the header at edges of the reinforcing walls opposed to the base wall
- the base wall is provided with insertion ledge engaging apertures at positions corresponding to the insertion ledges
- the insertion ledge engaging apertures are formed along the longitudinal direction of the header in a zigzag manner.
- a tip portion of the insertion ledge is inserted into the insertion ledge engaging aperture, and the tip portion of the insertion ledge is bent and engaged with an external surface of the base wall.
- the bent portion is formed by bending the tip portion of the insertion ledge by caulking processing.
- the aforementioned header for use in heat exchangers can be manufactured by the following method.
- the header in a method for manufacturing a header for use in heat exchangers in which the header includes a base wall with a plurality of tube insertion apertures for inserting heat exchanging tubes formed at predetermined intervals in a longitudinal direction of the base wall, an opposite wall opposed to the base wall, a pair of side walls disposed at both lateral sides of the base wall and the opposite wall and connecting the lateral sides, and a reinforcing wall disposed between the base wall and the opposite wall along a longitudinal direction thereof and connecting the base wall to the opposite wall, the method comprises:
- a step for preparing a formed plate including a base wall region having the plurality of tube insertion apertures and extending in a longitudinal direction of the formed plate, a pair of side wall regions formed at both lateral sides of the base wall region and extending in the longitudinal direction, a first half region of an opposite wall formed at one of lateral sides of the base wall region and extending in the longitudinal direction, a second half region of an opposite wall formed at the other of lateral sides of the base wall region and extending in the longitudinal direction, and a reinforcing wall region formed at at least one of the first and second half regions of the opposite wall and extending in the longitudinal direction;
- the reinforcing wall region is formed at each side of the first half region and the second half region of the opposite wall.
- the tube engaging cut-out portions are formed at portions of the reinforcing wall corresponding to the plurality of tube insertion apertures such that ends of the heat exchanging tubes inserted in the tube insertion apertures are engaged with the engaging cut-out portions in a positioned manner.
- insertion ledges are formed at a base wall side edge of the reinforcing wall and insertion ledge engaging apertures are formed at positions of the base wall corresponding to the insertion ledges, further comprising a step of inserting the insertion ledges into the insertion ledge engaging apertures.
- the formed plate is formed by die-cutting and pressing a brazing sheet with a brazing layer clad on at least one surface thereof.
- the fourth aspect of the present invention specifies the heat exchanger using the header according to the first aspect of the present invention.
- a heat exchanger comprises:
- At least one of the pair of headers includes:
- a reinforcing wall disposed between the base wall and the opposite wall along a longitudinal direction thereof and connecting the base wall to the opposite wall
- the reinforcing wall is integrally formed at at least one of sides of the first half of the opposite wall and the second half of the opposite wall by bending processing.
- the reinforcing wall is provided with tube engaging cut-out portions formed at positions corresponding to the plurality of tube insertion apertures, whereby each end of the plurality of heat exchanging tubes inserted into the tube insertion apertures is engaged with the tube engaging cut-out portion in a positioned manner.
- each end of the plurality of heat exchanging tubes is brazed to the header.
- the fifth aspect of the present invention specifies the heat exchanger using the headers according to the second aspect of the present invention.
- a heat exchanger comprises:
- At least one of the pair of headers includes:
- reinforcing walls disposed between the base wall and the opposite wall along a longitudinal direction thereof and connecting the base wall to the opposite wall
- each of the reinforcing walls is integrally formed at each of sides of the first half of the opposite wall and the second half of the opposite wall by bending processing
- each of the reinforcing walls is provided with insertion ledges at a base wall side edge of the reinforcing wall opposed to the base wall at predetermined intervals in a longitudinal direction of the header,
- the base wall is provided with insertion, ledge engaging apertures at positions corresponding to the insertion ledges, and
- the reinforcing wall is provided with tube engaging cut-out portions formed at positions corresponding to the plurality of tube insertion apertures, whereby each end of the plurality of heat exchanging tubes inserted into the tube insertion apertures is engaged with the tube engaging cut-out portion in a positioned manner.
- each end of the plurality of heat exchanging tubes is brazed to the header.
- the insertion ledge engaging apertures are formed in a zigzag manner in the longitudinal direction of the header.
- the sixth aspect of the present invention specifies the manufacturing method of the heat exchanger using the headers according to the first aspect of the present invention.
- a manufacturing method of a heat exchanger the method comprises:
- At least one of the pair of headers includes:
- the reinforcing wall is integrally formed at at least one of sides of the first half of the opposite wall and the second half of the opposite wall by bending processing.
- the step for preparing the header comprises:
- a step for preparing a formed plate including a base wall region having the plurality of tube insertion apertures and extending in a longitudinal direction of the formed plate, a pair of side wall regions formed at both lateral sides of the base wall region and extending in the longitudinal direction, a first half region of an opposite wall formed at one of lateral sides of the base wall 1 region and extending in the longitudinal direction, a second half region of an opposite wall formed at the other of lateral sides of the base wall region and extending in the longitudinal direction, and a reinforcing wall region formed at at least one of the first half and second half regions of the opposite wall and extending in the longitudinal direction;
- each end of the plurality of heat exchanging tubes is brazed to the header.
- a manufacturing method of a heat exchanger comprises:
- At least one of the pair of headers includes:
- each of the reinforcing walls is integrally formed at each of sides of the first half of the opposite wall and the second half of the opposite wall by bending processing
- each of the reinforcing walls is provided with insertion ledges at a base wall side edge of the reinforcing wall opposed to the base wall at predetermined intervals in a longitudinal direction of the header,
- the step for preparing the pair of header comprises:
- a step for preparing a formed plate including a base wall region having the plurality of tube insertion apertures and extending in a longitudinal direction of the formed plate, a pair of side wall regions formed at both lateral sides of the base wall region and extending in the longitudinal direction, a first half region of an opposite wall formed at one of lateral sides of the base wall 1 region and extending in the longitudinal direction, a second half region of an opposite wall formed at the other of lateral sides of the base wall region and extending in the longitudinal direction, and a reinforcing wall region formed at at least one of the first half and second half regions of the opposite wall and extending in the longitudinal direction;
- each end of the plurality of heat exchanging tubes is brazed to the header.
- FIG. 1 is an exploded perspective view showing a header and therearound applied to a heat exchanger according to a first embodiment of the present invention.
- FIG. 2A is a front view of the header for use in heat exchangers
- FIG. 2B is a side view thereof.
- FIG. 3 is a cross-sectional view of the header for use in heat exchangers.
- FIG. 4 is an enlarged side cross-sectional view showing the tube insertion aperture of the header and therearound.
- FIG. 5 is a cross-sectional view taken along the line 5 - 5 in FIG. 3.
- FIG. 6A is a cross-sectional view taken along the line 6 - 6 in FIG. 3, and FIG. 6B is an enlarged cross-sectional view of the portion surrounded by the alternate long and short dash line in FIG. 6A.
- FIG. 7 is a perspective view showing a press formed plate for manufacturing the header of the embodiment.
- FIG. 8 is a plane view showing the press formed plate.
- FIG. 9 is a side view showing a header and therearound applied to a heat exchanger according to a second embodiment of the present invention.
- FIG. 10 is a cross-sectional view showing the header for use in heat exchangers according to the second embodiment.
- FIG. 11A is a cross-sectional view taken along the line 11 - 11 in FIG. 10, and FIG. 11B is an enlarged cross-sectional view of the portion surrounded by the alternate long and short dash line in FIG. 11A.
- FIG. 12 is a perspective view showing a press formed plate for manufacturing the header of the second embodiment.
- FIG. 13 is a plane view showing the press formed plate of the second embodiment.
- FIGS. 14A to 14 E are enlarged cross-sectional views showing the connecting portion of the reinforcing wall and the base wall of the header for use in heat exchangers and therearound according to a modification of the present invention.
- FIGS. 15A and 15B are enlarged cross-sectional views showing the connecting portion of the reinforcing wall and the base wall of the header for use in heat exchangers and therearound according to another modification of the present invention.
- FIG. 16 is an exploded perspective view showing a conventional rectangular header for heat exchangers and therearound.
- FIGS. 1 to 6 show a header 10 for use in heat exchangers according to a first embodiment of the present invention.
- the header 10 includes a belt-shaped base wall 20 , an opposite wall 30 to be opposed to the base wall 20 , a pair of side walls 40 a and 40 b disposed between the lateral sides of the base wall 20 and the opposite wall 30 and a pair of reinforcing walls 50 a and 50 b disposed between the base wall 20 and the opposite wall 30 at the widthwise central position thereof and extending in the longitudinal direction of the header 10 .
- this header 10 is an integrally formed article obtained by bending a press formed plate 11 having a predetermined shape formed by die-cut press forming.
- the press formed plate 11 is a wide belt-shaped plate.
- the plate 11 has a base wall region 21 extending in the longitudinal direction of the plate 11 at the widthwise-middle region of the plate 11 .
- the base wall region 21 will constitute the aforementioned base wall 20 .
- side wall regions 41 a and 41 b extending in the longitudinal direction are integrally provided. These side wall regions 41 a and 41 b will constitute the aforementioned side walls 40 a and 40 b .
- a first half opposite wall region 31 a extending in the longitudinal direction is integrally provided.
- This first half opposite wall region 31 a will constitute a first half 30 a of the aforementioned opposite wall 30 .
- a second half opposite wall region 31 b extending in the longitudinal direction is integrally provided.
- This second half opposite wall region 31 b will constitute a second half 30 b of the aforementioned opposite wall 30 .
- reinforcing wall regions 51 a and 51 b extending in the longitudinal direction are integrally provided. These reinforcing wall regions 51 a and 51 b will constitute the aforementioned reinforcing walls 50 a and 50 b.
- tube insertion apertures 23 each extending the widthwise direction of the base wall region 21 are provided at certain intervals in the longitudinal direction of the base wall region 21 .
- the peripheral portion 23 a of the tube insertion aperture 23 is curved inwardly, i.e., toward the inside of the header to be formed by burring processing.
- a plurality of square-shaped insertion ledge engaging apertures 25 are formed at certain intervals so as to be located between the adjacent tube insertion apertures 23 .
- a plurality of tube engaging cut-out portions 53 a and 53 b are formed at predetermined intervals in the longitudinal direction of the reinforcing wall region 51 a and 51 b . Furthermore, at the side edge of the reinforcing wall region 51 a and 51 b between the adjacent tube engaging cut-out portions 53 a and 53 b , a plurality of rectangular-shaped insertion ledges 55 a and 55 b corresponding to the aforementioned tube insertion ledge engaging apertures 25 are formed at predetermined intervals in the longitudinal direction of the plate 11 .
- bending processing are conducted to this press formed plate 11 along the broken lines (bending lines) shown in FIG. 8 to thereby obtain the aforementioned header 10 .
- the reinforcing wall regions 51 a and 51 b are bent inwardly by 90° relative to the first half opposite wall region 31 a and the second half opposite wall region 31 b
- the first half opposite wall region 31 a and the second half opposite wall region 31 b are bent inwardly by 90° relative to the side wall regions 41 a and 41 b
- both the side wall regions 41 a and 41 b are bent by 90° relative to the base wall region 21 to thereby fit the reinforcing wall regions 51 a and 51 b .
- the fitted insertion ledges 55 a and 55 b of the reinforcing wall regions 51 a and 51 b are inserted into the insertion ledge engaging apertures 25 of the base wall region 20 , respectively, to thereby engage therewith.
- the order of bending processing is not limited to the aforementioned embodiment, and may be changed arbitrarily.
- the header 10 for use in heat exchangers is manufactured.
- the side wall regions 41 a and 41 b constitute the side walls 40 a and 40 b
- the first half opposite wall region 31 a constitutes one half 30 a of the opposite wall 30
- the second half opposite wall region 31 b constitutes the other half 30 b of the opposite wall 30
- the reinforcing wall regions 51 a and 51 b constitute the reinforcing walls 50 a and 50 b.
- the tube engaging cut-out portions 53 a and 53 b of the reinforcing walls 50 a and 50 b are disposed so as to face the corresponding tube insertion apertures 23 of the base wall 20 .
- both the side edges of the tube insertion aperture 23 formed in the base wall 20 are bent outwardly in accordance with the aforementioned bending processing to constitute tube insertion guides 23 b.
- a heat exchanger which is provided with a pair of headers 10 , a plurality of heat exchanging tubes 60 disposed in parallel with each other with opposite ends thereof communicated with the headers 10 and 10 and corrugated fins 70 interposed between the adjacent heat exchanging tubes 60 , can be obtained.
- the press formed plate 11 constituting the header 10 and the heat exchanging tube 60 is made of a brazing sheet in which a brazing layer is clad on at least one surface of a bare member or a plate with a brazing layer in which brazing materials such as powder brazing materials are given to at least one surface of a bare member.
- a provisionally assembled heat exchanger is obtained by alternatively stacking the heat exchanging tubes 60 and the corrugated fins 70 between the pair of headers 10 . Then, the provisionally assembled heat exchanger is brazed in a furnace, thereby obtaining a heat exchanger.
- the header 10 for use in heat exchangers, since the header 10 is obtained by bending a press formed plate 11 , the header 10 can be manufactured efficiently only by performing a series of bending press working.
- header 10 of this embodiment is manufactured by using only one sheet of the press formed plate 11 , it is not necessary to perform troublesome joining processing such as brazing processing and/or pinching processing. This results in a decreased number of parts, simplified assembling operation and a reduced manufacturing cost.
- the header 10 of this embodiment since the reinforcing walls 50 a and 50 b are disposed between the base wall 20 and the opposite wall 30 , sufficient strength against inner pressure can be obtained. Accordingly, the header 10 can be applied to a refrigeration cycle using CO 2 refrigerant in which high pressure resistance is required strictly.
- the tube engaging cut-out portions 53 a and 53 b of the reinforcing walls 50 a and 50 b can be formed by the die-cut press forming at the time of obtaining the press formed plate 11 , it is not necessary to perform troublesome work such as machining work for forming the cut-out portions, resulting in easier manufacturing of the header.
- the insertion ledges 55 a and 55 b are formed at the side edges of the reinforcing wall regions 51 a and 51 b of the press formed plate 11 and the insertion ledge engaging apertures 25 are formed in the base wall region 21 , and then the insertion ledge 55 a and 55 b are inserted in the insertion ledge engaging apertures 25 in a positioned manner at the time of bending processing of the press formed plate 11 . Accordingly, faults such as springback due to the bending of the plate can be prevented, thereby stabilizing the configuration of the provisionally assembled article. Thus, the stabilized configuration of the assembled article can be maintained until the brazing processing after the completion of the bending processing, resulting in enhanced dimensional accuracy and high quality.
- the tube 60 can be guided smoothly at the time of inserting the tube 60 into the aperture 23 .
- the tube insertion can be performed easily.
- the inwardly curved peripheral portion 23 a of the tube insertion aperture 23 increases the joining area between the peripheral portion 23 a and the tube 60 , resulting in enhanced air-tightness therebetween, which in turn further enhances quality and reliability of the header.
- FIGS. 9 to 13 show a header 10 for use in heat exchangers according to a second embodiment of the present invention.
- the press formed plate 11 constituting the header 10 is provided with a base wall region 21 , side wall regions 41 a and 41 b , a first half opposite wall region 31 a , a second half opposite wall region 31 b and first and second reinforcing wall regions 51 a and 51 b .
- tube insertion apertures 23 are provided at certain intervals.
- insertion ledges 55 a and 55 b are formed alternatively in the longitudinal direction of the plate 11 . Furthermore, between the adjacent tube insertion apertures 23 in the base wall region 21 , a first insertion ledge engaging aperture 25 a and a second insertion ledge engaging aperture 25 b corresponding to the insertion ledges 55 a and 55 b are formed alternatively in a zigzag manner.
- each region 31 a , 31 b , 41 a , 41 b , 51 a and 51 b of this press formed plate 11 is bent, so that the reinforcing regions 51 a and 51 b are put together.
- the insertion ledges 55 a and 55 b of the reinforcing regions 51 a and 51 b are inserted into corresponding insertion ledge engaging apertures 25 a and 25 b .
- the tip portions of the insertion ledges 55 a and 55 b are bent outwardly by caulking processing, whereby the bent portions 80 a and 80 b are engaged with the external surface of the base wall 20 .
- the header 10 for use in heat exchangers is manufactured.
- the insertion ledges 55 a and 55 b formed at the side edges of the reinforcing regions 51 a and 51 b of the press formed plate 11 are formed alternatively along the longitudinal direction of the header between the first reinforcing region 51 a and the second reinforcing region 51 b , and that the insertion ledge engaging apertures 25 a and 25 b are formed in a zigzag manner corresponding to the insertion ledges 55 a and 55 b .
- the insertion operations of the insertion ledges 55 a and 55 b into the engaging apertures 25 a and 25 b can be performed smoothly, which makes it easier to manufacture the header 10 .
- the tip portions of the insertion ledges 55 a and 55 b are bent outwardly by caulking processing so that the bent portions 80 a and 80 b are engaged with the external surface of the base wall 20 , stronger engaging status can be obtained and the number of insertion ledges 55 a and 55 b can be decreased, resulting in decreased amount of materials. Accordingly, the manufacturing cost can be decreased. Furthermore, since the tip portion of the insertion ledge is caulked and fixed, faults such as spring back due to a bending process can be prevented more assuredly, thereby stabilizing the configuration. Accordingly, the dimensional accuracy can be further improved, and therefore header products with higher quality can be obtained.
- the tip portions of the reinforcing walls 50 a and 50 b are inserted into and engaged with the base wall 20 .
- the present invention is not limited to the above.
- the tip ends of the reinforcing walls 50 a and 50 b may be brazed to the inner surface of the base wall 20 with the tip ends abutted thereto.
- the outwardly bent tip portions of the reinforcing walls 50 a and 50 b may be brazed to the inner surface of the base wall 20 .
- the larger joining area between the reinforcing walls 50 a and 50 b and the base wall 20 can be secured, which assuredly prevents generation of faults such as poor brazing.
- two tip portions of the reinforcing walls 50 a and 50 b may be secured to the base wall 20 by another methods other than the aforementioned methods.
- the reinforcing walls 50 a and 50 b may be brazed to the base wall 20 in the state in which the tip end of the first reinforcing wall 50 a abuts against the inner surface of the base wall 20 while the insertion ledge 55 b of the second reinforcing wall 50 b is inserted into the base wall 20 .
- the reinforcing walls 50 a and 50 b may be brazed to the base wall 20 in the state in which the tip end of the first reinforcing wall 50 a abuts against the inner surface of the base wall 20 while the bent tip portion 81 b of the second reinforcing wall 50 b abuts against the base wall 20 .
- the reinforcing walls 50 a and 50 b may be brazed to the base wall 20 in the state in which the bent tip portion 81 a of the first reinforcing wall 50 a abuts against the inner surface of the base wall 20 while the insertion ledge 55 b of the second reinforcing wall 50 b abuts against the base wall 20 .
- the reinforcing walls 50 a and 50 b may be brazed to the base wall 20 in the state in which the bent tip portions 81 a and 81 b formed at certain intervals along the longitudinal direction of the reinforcing walls 50 a and 50 b abut against the base wall 20 while the end portions between the bent tip portions abut against the base wall 20 .
- the reinforcing walls 50 a and 50 b may be brazed to the base wall 20 in the state in which the bent tip portions 81 a and 81 b formed at certain intervals along the longitudinal direction of the reinforcing walls 50 a and 50 b abut against the base wall 20 while the end portions 55 b between the bent tip portions are inserted into the base wall 20 .
- two reinforcing walls 50 a and 50 b are provided.
- a reinforcing wall region may be provided at either the first half opposite wall region 31 a or the second half opposite wall region 31 b .
- one of the aforementioned reinforcing walls 50 a and 50 b may be omitted.
- the base wall, the side walls, the opposite wall and the reinforcing wall are integrally formed by bending processing, it is not necessary to perform troublesome joining processing such as brazing processing or pinching processing. Furthermore, it is possible to decrease the number of parts. Accordingly, the assembly operation can be performed easily and the manufacturing costs can be decreased. Furthermore, since the reinforcing wall is disposed between the base wall and the opposite wall, enough pressure resistance can be obtained assuredly.
- the positioning of the tube can be performed by engaging the end portion of the tube with the cut-out portion.
- the insertion of the tube can be performed smoothly and the assembly operation can be performed easily.
- the reinforcing wall can be fixed to the base wall more assuredly.
- faults such as springback can be prevented assuredly, and the configuration of the provisional header can be stabilized. Accordingly, there is advantage that higher quality can be obtained.
- the joining area of the reinforcing wall to the base plate can be increased. Accordingly, it becomes possible to more assuredly prevent securing faults such as brazing faults.
- the peripheral portion of the tube insertion aperture is curved inwardly, at the time of inserting the tube into the tube insertion aperture, the peripheral portion guides the tube. Therefore, the tube can be inserted easily. Furthermore, larger joining area between the tube and the peripheral portion of the tube insertion aperture can be obtained, resulting in enhanced air-tightness therebetween, which in turn enhances the quality and reliability.
- the header can be suitably used for a heat exchanger such as a condenser and an evaporator for use in a refrigeration system for an automobile air-conditioner.
- a heat exchanger such as a condenser and an evaporator for use in a refrigeration system for an automobile air-conditioner.
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Abstract
A header for use in heat exchanger includes a base wall (20) with a plurality of tube insertion apertures (23), an opposite wall (30) opposed to the base wall (20), a pair of side walls (40 a and 40 b) disposed at both lateral sides of the base wall (20) and the opposite wall (30) and connecting the lateral sides and are inforcing walls (50 a and 50 b) disposed betwwen the base wall (20) and the opposite wall (30) along a longitudinal direction thereof and connecting the base wall (20) with the opposite wall (30). The side walls (40 a and 40 b) are integrally formed at both lateral sides of the base wall (20) be bending processing. A first half (30a) of the opposite wall (30) is integrally formed at a side of one of the side walls (40 a) by bending processing, and a second half (30 b) of the opposite wall (30) is integrally formed at a side of the other of the side walls (40 b) by bending processing. Reinforcing walls (50 a and 50 b) are integrally formed at sides of the first half (30 a) and the second half (30 b) of the opposite wall (30) by bending processing. With this header for use in heat exchanger, high pressure resistance can be obtained, and the number of parts and the manufacturing cost can be decreased.
Description
- This application claims priority to Japanese Patent Application No. 2001-95242 filed on Mar. 29, 2001 and U.S. Provisional Application No. 60/302,691 filed on Jul. 5, 2001, the disclosure of which is incorporated by reference in its entirety.
- This application is an application filed under 35 U.S.C. §111(a) claiming the benefit pursuant to 35 U.S.C. §119(e)(1) of the filing date of Provisional Application No. 60/302,691 filed on Jul. 5, 2001 pursuant to 35 U.S.C. §111(b).
- The present invention relates to a header suitably used for a heat exchanger such as a condenser and an evaporator for use in a refrigeration system for an automobile air-conditioner, and also relates to a method for manufacturing the header.
- As a condenser for use in air-conditioning systems for automobiles, the so-called header-type heat exchanger, which is provided with a pair of headers and a plurality of heat exchanging tubes disposed in parallel with each other between the headers with opposite ends thereof communicated with the headers, is widely used.
- In this header-type heat exchanger, a pipe having a round cross-section is widely used as a header. However, in order to decrease the size and weight and enhance the performance, it is recently considered to employ a header having a flat cross-section such as an elliptical cross-section, an oval cross-section or a rectangular cross-section.
- As for this kind of header, it is known to employ a header having a flat cross-section as disclosed by, for example, Japanese Unexamined Laid-open Patent Publication No. 2000-39288. The schematic structure of this header is shown in FIG. 16. This
header 1 includes two members, that is, a first peripheral wall member 2 and a secondperipheral wall member 3. The first peripheral wall member 2 includes a base wall 2 a in which a plurality of tube insertion apertures 2 c are formed at predetermined intervals along the longitudinal direction of the base wall 2 a and a pair of joiningportions peripheral wall member 3 includes anopposite wall 3 a) to be opposed the base wall 2 a and a pair ofside walls opposite wall 3 a. - The first peripheral wall member2 and the second
peripheral wall member 3 are coupled together, and theside walls portions header 1. - In the
aforementioned header 1 for use in heat exchangers, a plurality ofheat exchanging tubes 5 disposed in parallel with each other are inserted into corresponding tube insertion apertures 2 c and fixed therein to thereby fabricate a header-type heat exchanger. - In the
aforementioned header 1, however, the thickness of theperipheral wall member 2 and 3 becomes smaller in accordance with the request that the header be smaller in size and lighter in weight. Therefore, it is difficult to secure predetermined pressure resistance only by theperipheral wall members 2 and 3. To cope with the problems, it is considered to provide a reinforcing partition 4 in theheader 1 as shown by the phantom line. - However, this
header 1 having the aforementioned configuration cannot be manufactured by using an electric resistance weld pipe and therefore has to be manufactured by welding or pinching thewall members 2 and 3. This causes not only a complicated configuration but also an increased number of parts, resulting in complicated assembling operation and an increased manufacturing cost. Especially, in cases where the reinforcing partition 4 is assembled within theheader 1, it is necessary to form a number of cut-outportions 4 a in the partition 4 by machining processing or the like so as not to impede the insertion of theheat exchanging tube 5 into theheader 1. This requires an adoption of troublesome machining processing and increases the number of processing steps, which in turn increases the manufacturing cost. - It is an object of the present invention to provide a header for use in heat exchangers capable of obtaining enough pressure resistance, decreasing the number of parts and the manufacturing cost and performing the assembly work easily. It is another object of the present invention to provide a method for manufacturing the aforementioned header for use in heat exchangers.
- It is still another object of the present invention to provide a heat exchanger using the aforementioned headers and a method for manufacturing the header and the heat exchanger.
- According to the first aspect of the present invention, a header for use in heat exchangers includes a base wall with a plurality of tube insertion apertures for inserting heat exchanging tubes formed at predetermined intervals in a longitudinal direction of the base wall, an opposite wall opposed to the base wall, a pair of side walls disposed at both lateral sides of the base wall and the opposite wall and connecting the lateral sides, and a reinforcing wall disposed between the base wall and the opposite wall along a longitudinal direction thereof and connecting the base wall to the opposite wall. The side walls are integrally formed at both lateral sides of the base wall by bending processing. A first half of the opposite wall constituting one half of the opposite wall is integrally formed at a side of one of the side walls by bending processing. A second half of the opposite wall constituting the other half of the opposite wall is integrally formed at a side of the other of the side walls by bending processing. The reinforcing wall is integrally formed at at least one of sides of the first half of the opposite wall and the second half of the opposite wall by bending processing.
- In the aforementioned header for use in heat exchangers, since the base wall, the side walls, the opposite wall and the reinforcing wall are integrally formed by bending processing, it is not required to perform joining processing of these members, such as brazing processing or pinching processing, and it becomes possible to reduce the number of parts. Furthermore, since the reinforcing wall is disposed between the base wall and the opposite wall, it is possible to assuredly obtain sufficient strength against the inner pressure.
- It is preferable that the reinforcing wall is formed at each side of the first half of the opposite wall and the second half of the opposite wall. In this case, since there are two reinforcing walls, it becomes possible to further enhance the pressure resistance.
- It is preferable that a side edge of the reinforcing wall opposed to the base wall is integrally brazed to the base wall.
- It is preferable that the reinforcing wall is provided with tube engaging cut-out portions formed at positions corresponding to the plurality of tube insertion apertures, whereby each end of the plurality of heat exchanging tubes inserted into the tube insertion apertures is engaged with the tube engaging cut-out portion in a positioned manner. In this case, since it is possible to position the heat exchanging tubes by engaging each end of the plurality of heat exchanging tubes with the tube engaging cut-out portion, the tube insertion amount adjustment can be performed more easily and accurately, and the tube insertion operation can be performed smoothly.
- Furthermore, it is preferable that the reinforcing wall is provided with insertion ledges at the side edge thereof opposed to the base wall, and the base wall is provided with insertion ledge engaging apertures at positions corresponding to the insertion ledges, and the insertion ledges are inserted into the insertion ledge engaging apertures and engaged therewith. In this case, since the insertion ledges of the reinforcing wall are engaged with and fixed to the insertion ledge engaging apertures, it becomes possible to avoid problems such as springback. Thus, the provisional assembly can be maintained stably after the bending processing until the brazing processing, which enables to maintain the high dimensional accuracy.
- It is preferable that the insertion ledges are integrally brazed to the base wall with the insertion ledges inserted into the insertion ledge engaging apertures.
- It is preferable that a peripheral edge of the tube insertion aperture is inwardly bent. In this case, the heat exchanging tube is guided smoothly by the peripheral edge of the tube insertion aperture at the time of inserting the tube into the tube insertion aperture. Therefore, the tube insertion operation can be performed more easily. Furthermore, the joining area between the tube and the tube insertion aperture can be kept larger, which in turn enables to obtain reliable air-tightness of the joined portion.
- According to a second aspect of the present invention, a header for use in heat exchangers, the header comprises:
- a base wall with a plurality of tube insertion apertures for inserting heat exchanging tubes formed at predetermined intervals D in a longitudinal direction of the base wall;
- an opposite wall opposed to the base wall;
- a pair of side walls disposed at both lateral sides of the base wall and the opposite wall and connecting the lateral sides; and
- a reinforcing wall disposed between the base wall and the opposite wall along a longitudinal direction thereof and connecting the base wall to the opposite wall,
- wherein the side walls are integrally formed at both lateral sides of the base wall by bending processing,
- wherein a first half of the opposite wall constituting one half of the opposite wall is integrally formed at a side of one of the side walls by bending processing,
- wherein a second half of the opposite wall constituting the other half of the opposite wall is integrally formed at a side of the other of the side walls by bending processing, and
- wherein the reinforcing wall is integrally formed at respective sides of the first half of the opposite wall and the second half of the opposite wall by bending processing,
- wherein insertion ledges are formed at certain intervals in a longitudinal direction of the header at edges of the reinforcing walls opposed to the base wall,
- wherein the insertion ledges of the one of the reinforcing walls and the insertion ledges of the other of the reinforcing walls are disposed alternatively along the longitudinal direction of the header,
- wherein the base wall is provided with insertion ledge engaging apertures at positions corresponding to the insertion ledges, and
- wherein the insertion ledges are inserted into corresponding insertion ledge engaging apertures and engaged therewith.
- It is preferable that the insertion ledge engaging apertures are formed along the longitudinal direction of the header in a zigzag manner.
- It is preferable that a tip portion of the insertion ledge is inserted into the insertion ledge engaging aperture, and the tip portion of the insertion ledge is bent and engaged with an external surface of the base wall.
- It is preferable that the bent portion is formed by bending the tip portion of the insertion ledge by caulking processing.
- The aforementioned header for use in heat exchangers can be manufactured by the following method.
- That is, according to the third aspect of the present invention, in a method for manufacturing a header for use in heat exchangers in which the header includes a base wall with a plurality of tube insertion apertures for inserting heat exchanging tubes formed at predetermined intervals in a longitudinal direction of the base wall, an opposite wall opposed to the base wall, a pair of side walls disposed at both lateral sides of the base wall and the opposite wall and connecting the lateral sides, and a reinforcing wall disposed between the base wall and the opposite wall along a longitudinal direction thereof and connecting the base wall to the opposite wall, the method comprises:
- a step for preparing a formed plate, the formed plate including a base wall region having the plurality of tube insertion apertures and extending in a longitudinal direction of the formed plate, a pair of side wall regions formed at both lateral sides of the base wall region and extending in the longitudinal direction, a first half region of an opposite wall formed at one of lateral sides of the base wall region and extending in the longitudinal direction, a second half region of an opposite wall formed at the other of lateral sides of the base wall region and extending in the longitudinal direction, and a reinforcing wall region formed at at least one of the first and second half regions of the opposite wall and extending in the longitudinal direction;
- a step for bending the reinforcing wall region relative to the first half region of the opposite wall and/or the second half region of the opposite wall;
- a step for bending the first half region of the opposite wall and/or the second half region of the opposite wall relative to the side wall regions; and
- a step for bending the side wall regions relative to the base wall region, to thereby obtain the header in which the base wall, the side walls, the opposite wall and the reinforcing wall are constituted by the base wall region, the side wall regions, the opposite wall region and the reinforcing wall region, respectively.
- According to the third aspect of the present invention, it is preferable that in the step for preparing the formed plate the reinforcing wall region is formed at each side of the first half region and the second half region of the opposite wall.
- In the step for preparing the formed plate, it is preferable that the tube engaging cut-out portions are formed at portions of the reinforcing wall corresponding to the plurality of tube insertion apertures such that ends of the heat exchanging tubes inserted in the tube insertion apertures are engaged with the engaging cut-out portions in a positioned manner.
- It is preferable that, in the step for preparing the formed plate, insertion ledges are formed at a base wall side edge of the reinforcing wall and insertion ledge engaging apertures are formed at positions of the base wall corresponding to the insertion ledges, further comprising a step of inserting the insertion ledges into the insertion ledge engaging apertures.
- Furthermore, it is preferable that, in the step for preparing the formed plate, the formed plate is formed by die-cutting and pressing a brazing sheet with a brazing layer clad on at least one surface thereof.
- The fourth aspect of the present invention specifies the heat exchanger using the header according to the first aspect of the present invention.
- According to the fourth aspect of the present invention, a heat exchanger, comprises:
- a pair of headers for use in heat exchangers; and
- a plurality of heat exchanging tubes disposed in parallel with each other between the pair of headers with opposite ends thereof communicated with the headers,
- wherein at least one of the pair of headers includes:
- a base wall with a plurality of tube insertion apertures for inserting the heat exchanging tubes formed at predetermined intervals in a longitudinal direction of the base wall;
- an opposite wall opposed to the base wall;
- a pair of side walls disposed at both lateral sides of the base wall and the opposite wall and connecting the lateral sides; and
- a reinforcing wall disposed between the base wall and the opposite wall along a longitudinal direction thereof and connecting the base wall to the opposite wall,
- wherein the side walls are integrally formed at both lateral sides of the base wall by bending processing,
- wherein a first half of the opposite wall constituting one half of the opposite wall is integrally formed at a side of one of the side walls by bending processing,
- wherein a second half of the opposite wall constituting the other half of the opposite wall is integrally formed at a side of the other of the side walls by bending processing, and
- wherein the reinforcing wall is integrally formed at at least one of sides of the first half of the opposite wall and the second half of the opposite wall by bending processing.
- In the hear exchanger, the same functions and effects as mentioned above can be obtained since the heat exchanger uses the headers according to the first aspect of the present invention.
- In the heat exchanger according to the fourth aspect of the present invention, it is preferable that the reinforcing wall is provided with tube engaging cut-out portions formed at positions corresponding to the plurality of tube insertion apertures, whereby each end of the plurality of heat exchanging tubes inserted into the tube insertion apertures is engaged with the tube engaging cut-out portion in a positioned manner.
- Furthermore, it is preferable that each end of the plurality of heat exchanging tubes is brazed to the header.
- The fifth aspect of the present invention specifies the heat exchanger using the headers according to the second aspect of the present invention.
- According to the fifth aspect of the present invention, a heat exchanger, comprises:
- a pair of headers for use in heat exchangers; and
- a plurality of heat exchanging tubes disposed in parallel with each other between the pair of headers with opposite ends thereof communicated with the headers,
- wherein at least one of the pair of headers includes:
- a base wall with a plurality of tube insertion apertures for inserting the heat exchanging tubes formed at predetermined intervals in a longitudinal direction of the base wall;
- an opposite wall opposed to the base wall;
- a pair of side walls disposed at both lateral sides of the base wall and the opposite wall and connecting the lateral sides; and
- reinforcing walls disposed between the base wall and the opposite wall along a longitudinal direction thereof and connecting the base wall to the opposite wall,
- wherein the side walls are integrally formed at both lateral sides of the base wall by bending processing,
- wherein a first half of the opposite wall constituting one half of the opposite wall is integrally formed at a side of one of the side walls by bending processing,
- wherein a second half of the opposite wall constituting the other half of the opposite wall is integrally formed at a side of the other of the side walls by bending processing,
- wherein each of the reinforcing walls is integrally formed at each of sides of the first half of the opposite wall and the second half of the opposite wall by bending processing,
- wherein each of the reinforcing walls is provided with insertion ledges at a base wall side edge of the reinforcing wall opposed to the base wall at predetermined intervals in a longitudinal direction of the header,
- wherein the insertion ledges of one of the reinforcing walls and the insertion ledges of the other of the reinforcing walls are disposed alternatively in the longitudinal direction of the header,
- wherein the base wall is provided with insertion, ledge engaging apertures at positions corresponding to the insertion ledges, and
- wherein the insertion ledges are inserted into the insertion ledge engaging apertures and engaged therewith, respectively.
- In this heat exchanger, since the heat exchanger uses the headers according to the second aspect of the present invention, the same functions and effects as mentioned above can be obtained.
- In the fifth aspect of the present invention, it is preferable that the reinforcing wall is provided with tube engaging cut-out portions formed at positions corresponding to the plurality of tube insertion apertures, whereby each end of the plurality of heat exchanging tubes inserted into the tube insertion apertures is engaged with the tube engaging cut-out portion in a positioned manner.
- Furthermore, it is preferable that the each end of the plurality of heat exchanging tubes is brazed to the header.
- Furthermore, it is preferable that the insertion ledge engaging apertures are formed in a zigzag manner in the longitudinal direction of the header.
- The sixth aspect of the present invention specifies the manufacturing method of the heat exchanger using the headers according to the first aspect of the present invention.
- According to the sixth aspect of the present invention, a manufacturing method of a heat exchanger, the method comprises:
- a step for preparing a pair of headers for use in heat exchangers;
- a step for preparing a plurality of heat exchanging tubes; and
- a step for disposing the plurality of heat exchanging tubes in parallel with each other between the pair of headers with opposite ends thereof communicated with the headers,
- wherein at least one of the pair of headers includes:
- a base wall with a plurality of tube insertion apertures for inserting heat exchanging tubes formed at predetermined intervals in a longitudinal direction of the base wall;
- an opposite wall opposed to the base wall;
- a pair of side walls disposed at both lateral sides of the base wall and the opposite wall and connecting the lateral sides; and
- a reinforcing wall disposed between the base wall and the opposite wall along a longitudinal direction thereof and connecting the base wall to the opposite wall,
- wherein the side walls are integrally formed at both lateral sides of the base wall by bending processing,
- wherein a first half of the opposite wall constituting one half of the opposite wall is integrally formed at a side of one of the side walls by bending processing,
- wherein a second half of the opposite wall constituting the other half of the opposite wall is integrally formed at a side of the other of the side walls by bending processing, and
- wherein the reinforcing wall is integrally formed at at least one of sides of the first half of the opposite wall and the second half of the opposite wall by bending processing.
- In this manufacturing method of the heat exchanger, since it uses the headers according to the first aspect of the present invention, the same functions and effects as mentioned above can be obtained.
- According to the sixth aspect of the present invention, the step for preparing the header comprises:
- a step for preparing a formed plate, the formed plate including a base wall region having the plurality of tube insertion apertures and extending in a longitudinal direction of the formed plate, a pair of side wall regions formed at both lateral sides of the base wall region and extending in the longitudinal direction, a first half region of an opposite wall formed at one of lateral sides of the
base wall 1 region and extending in the longitudinal direction, a second half region of an opposite wall formed at the other of lateral sides of the base wall region and extending in the longitudinal direction, and a reinforcing wall region formed at at least one of the first half and second half regions of the opposite wall and extending in the longitudinal direction; - a step for bending the reinforcing wall region relative to the first half region of the opposite wall and/or the second half region of the opposite wall;
- a step for bending the first half region of the opposite wall and/or the second half region of the opposite wall relative to the side wall regions; and
- a step for bending the side wall regions relative to the base wall region.
- Furthermore, it is preferable that the each end of the plurality of heat exchanging tubes is brazed to the header.
- According to the seventh aspect of the present invention, a manufacturing method of a heat exchanger, comprises:
- a step for preparing a pair of headers for use in heat exchangers;
- a step for preparing a plurality of heat exchanging tubes; and
- a step for disposing the plurality of heat exchanging tubes in parallel with each other between the pair of headers with opposite ends thereof communicated with the headers,
- wherein at least one of the pair of headers includes:
- a base wall with a plurality of tube insertion apertures for inserting heat exchanging tubes formed at predetermined intervals in a longitudinal direction of the base wall;
- an opposite wall opposed to the base wall;
- a pair of side walls disposed at both lateral sides of the base wall and the opposite wall and connecting the lateral sides; and
- reinforcing walls disposed between the base wall and the opposite wall along a longitudinal direction thereof and connecting the base wall to the opposite wall,
- wherein the side walls are integrally formed at both lateral sides of the base wall by bending processing,
- wherein a first half of the opposite wall constituting one half of the opposite wall is integrally formed at a side of one of the side walls by bending processing,
- wherein a second half of the opposite wall constituting the other half of the opposite wall is integrally formed at a side of the other of the side walls by bending processing,
- wherein each of the reinforcing walls is integrally formed at each of sides of the first half of the opposite wall and the second half of the opposite wall by bending processing,
- wherein each of the reinforcing walls is provided with insertion ledges at a base wall side edge of the reinforcing wall opposed to the base wall at predetermined intervals in a longitudinal direction of the header,
- wherein the insertion ledges of one of the reinforcing walls and the insertion ledges of the other of the reinforcing walls are disposed alternatively in the longitudinal direction of the header,
- wherein the base wall is provided with insertion ledge engaging apertures at positions corresponding to the insertion ledges, and
- wherein the insertion ledges are inserted into the insertion ledge engaging apertures and engaged therewith, respectively.
- In this manufacturing method of the heat exchanger, since it uses the headers according to the second aspect of the present invention, the same functions and effects as mentioned above can be obtained.
- In this manufacturing method according to the seventh aspect of the present invention, the step for preparing the pair of header comprises:
- a step for preparing a formed plate, the formed plate including a base wall region having the plurality of tube insertion apertures and extending in a longitudinal direction of the formed plate, a pair of side wall regions formed at both lateral sides of the base wall region and extending in the longitudinal direction, a first half region of an opposite wall formed at one of lateral sides of the
base wall 1 region and extending in the longitudinal direction, a second half region of an opposite wall formed at the other of lateral sides of the base wall region and extending in the longitudinal direction, and a reinforcing wall region formed at at least one of the first half and second half regions of the opposite wall and extending in the longitudinal direction; - a step for bending the reinforcing wall region relative to the first half region of the opposite wall and/or the second half region of the opposite wall;
- a step for bending the first half region of the opposite wall and/or the second half region of the opposite wall relative to the side wall regions; and
- a step for bending the side wall regions relative to the base wall region.
- Furthermore, it is preferable that each end of the plurality of heat exchanging tubes is brazed to the header.
- Other objects and advantages of the present invention will be apparent from the following preferred embodiments.
- FIG. 1 is an exploded perspective view showing a header and therearound applied to a heat exchanger according to a first embodiment of the present invention.
- FIG. 2A is a front view of the header for use in heat exchangers, and FIG. 2B is a side view thereof.
- FIG. 3 is a cross-sectional view of the header for use in heat exchangers.
- FIG. 4 is an enlarged side cross-sectional view showing the tube insertion aperture of the header and therearound.
- FIG. 5 is a cross-sectional view taken along the line5-5 in FIG. 3.
- FIG. 6A is a cross-sectional view taken along the line6-6 in FIG. 3, and FIG. 6B is an enlarged cross-sectional view of the portion surrounded by the alternate long and short dash line in FIG. 6A.
- FIG. 7 is a perspective view showing a press formed plate for manufacturing the header of the embodiment.
- FIG. 8 is a plane view showing the press formed plate.
- FIG. 9 is a side view showing a header and therearound applied to a heat exchanger according to a second embodiment of the present invention.
- FIG. 10 is a cross-sectional view showing the header for use in heat exchangers according to the second embodiment.
- FIG. 11A is a cross-sectional view taken along the line11-11 in FIG. 10, and FIG. 11B is an enlarged cross-sectional view of the portion surrounded by the alternate long and short dash line in FIG. 11A.
- FIG. 12 is a perspective view showing a press formed plate for manufacturing the header of the second embodiment.
- FIG. 13 is a plane view showing the press formed plate of the second embodiment.
- FIGS. 14A to14E are enlarged cross-sectional views showing the connecting portion of the reinforcing wall and the base wall of the header for use in heat exchangers and therearound according to a modification of the present invention.
- FIGS. 15A and 15B are enlarged cross-sectional views showing the connecting portion of the reinforcing wall and the base wall of the header for use in heat exchangers and therearound according to another modification of the present invention.
- FIG. 16 is an exploded perspective view showing a conventional rectangular header for heat exchangers and therearound.
- <First Embodiment>
- FIGS.1 to 6 show a
header 10 for use in heat exchangers according to a first embodiment of the present invention. As shown in these figures, theheader 10 includes a belt-shapedbase wall 20, anopposite wall 30 to be opposed to thebase wall 20, a pair ofside walls base wall 20 and theopposite wall 30 and a pair of reinforcingwalls base wall 20 and theopposite wall 30 at the widthwise central position thereof and extending in the longitudinal direction of theheader 10. - As shown in FIGS. 7 and 8, this
header 10 is an integrally formed article obtained by bending a press formedplate 11 having a predetermined shape formed by die-cut press forming. In detail, the press formedplate 11 is a wide belt-shaped plate. Theplate 11 has abase wall region 21 extending in the longitudinal direction of theplate 11 at the widthwise-middle region of theplate 11. Thebase wall region 21 will constitute theaforementioned base wall 20. At both sides of thebase wall region 21,side wall regions side wall regions aforementioned side walls side wall regions 41 a, a first half oppositewall region 31 a extending in the longitudinal direction is integrally provided. This first half oppositewall region 31 a will constitute afirst half 30 a of the aforementionedopposite wall 30. At the side of the otherside wall region 41 b, a second half oppositewall region 31 b extending in the longitudinal direction is integrally provided. This second half oppositewall region 31 b will constitute asecond half 30 b of the aforementionedopposite wall 30. Furthermore, at the sides of the first half oppositewall region 31 a and the second half oppositewall region 31 b, reinforcingwall regions wall regions walls - In FIG. 8, the boundary line (bending line) of each region is shown by a broken line for an easy understanding of the invention.
- At the
base wall region 21 of the press formedplate 11,tube insertion apertures 23 each extending the widthwise direction of thebase wall region 21 are provided at certain intervals in the longitudinal direction of thebase wall region 21. Theperipheral portion 23 a of thetube insertion aperture 23 is curved inwardly, i.e., toward the inside of the header to be formed by burring processing. Furthermore, along the centerline of thebase wall region 21, a plurality of square-shaped insertionledge engaging apertures 25 are formed at certain intervals so as to be located between the adjacenttube insertion apertures 23. - Furthermore, at positions of the side edge of the reinforcing
wall region tube insertion apertures 23, a plurality of tube engaging cut-outportions wall region wall region portions insertion ledges ledge engaging apertures 25 are formed at predetermined intervals in the longitudinal direction of theplate 11. - In this embodiment, bending processing are conducted to this press formed
plate 11 along the broken lines (bending lines) shown in FIG. 8 to thereby obtain theaforementioned header 10. In detail, the reinforcingwall regions wall region 31 a and the second half oppositewall region 31 b, and the first half oppositewall region 31 a and the second half oppositewall region 31 b are bent inwardly by 90° relative to theside wall regions side wall regions base wall region 21 to thereby fit the reinforcingwall regions insertion ledges wall regions ledge engaging apertures 25 of thebase wall region 20, respectively, to thereby engage therewith. - In this invention, the order of bending processing is not limited to the aforementioned embodiment, and may be changed arbitrarily.
- Through the aforementioned bending processing, as shown in FIGS.1 to 6, the
header 10 for use in heat exchangers is manufactured. In thisheader 10, theside wall regions side walls wall region 31 a constitutes onehalf 30 a of theopposite wall 30, the second half oppositewall region 31 b constitutes theother half 30 b of theopposite wall 30, and the reinforcingwall regions walls - In this assembled state, the tube engaging cut-out
portions walls tube insertion apertures 23 of thebase wall 20. - Furthermore, as shown in FIG. 5, both the side edges of the
tube insertion aperture 23 formed in thebase wall 20 are bent outwardly in accordance with the aforementioned bending processing to constitute tube insertion guides 23 b. - In manufacturing a heat exchanger using the
aforementioned header 10, as shown in FIG. 1, end portions of a plurality ofheat exchanging tubes 60 disposed in parallel with each other via acorrugated fin 70 are inserted into the correspondingtube insertion apertures 23 of theheader 10 to engage with the tube engaging cut-outportions walls header 10 in a positioned manner. - At this time, since the tube insertion guides23 b and 23 b are formed at both the edges of the
tube insertion aperture 23 formed in theheader 10 as described above (see FIG. 5), the tube end portion will be guided smoothly into thetube insertion aperture 23 by theguides heat exchanging tube 60 into thetube insertion aperture 23 can be performed easily. Furthermore, since the positioning of thetube 60 is completed by engaging the tube end with the tube engaging cut-outportions tube 60 and the like can be performed automatically, which enables an easy insertion of thetube 60. - In this way, a heat exchanger, which is provided with a pair of
headers 10, a plurality ofheat exchanging tubes 60 disposed in parallel with each other with opposite ends thereof communicated with theheaders corrugated fins 70 interposed between the adjacentheat exchanging tubes 60, can be obtained. - In this embodiment, the press formed
plate 11 constituting theheader 10 and theheat exchanging tube 60 is made of a brazing sheet in which a brazing layer is clad on at least one surface of a bare member or a plate with a brazing layer in which brazing materials such as powder brazing materials are given to at least one surface of a bare member. Then, as described above, a provisionally assembled heat exchanger is obtained by alternatively stacking theheat exchanging tubes 60 and thecorrugated fins 70 between the pair ofheaders 10. Then, the provisionally assembled heat exchanger is brazed in a furnace, thereby obtaining a heat exchanger. - As mentioned above, according to this
header 10 for use in heat exchangers, since theheader 10 is obtained by bending a press formedplate 11, theheader 10 can be manufactured efficiently only by performing a series of bending press working. - Furthermore, since the
header 10 of this embodiment is manufactured by using only one sheet of the press formedplate 11, it is not necessary to perform troublesome joining processing such as brazing processing and/or pinching processing. This results in a decreased number of parts, simplified assembling operation and a reduced manufacturing cost. - Furthermore, in the
header 10 of this embodiment, since the reinforcingwalls base wall 20 and theopposite wall 30, sufficient strength against inner pressure can be obtained. Accordingly, theheader 10 can be applied to a refrigeration cycle using CO2 refrigerant in which high pressure resistance is required strictly. - Furthermore, since the tube engaging cut-out
portions walls plate 11, it is not necessary to perform troublesome work such as machining work for forming the cut-out portions, resulting in easier manufacturing of the header. - Furthermore, in this embodiment, the
insertion ledges wall regions plate 11 and the insertionledge engaging apertures 25 are formed in thebase wall region 21, and then theinsertion ledge ledge engaging apertures 25 in a positioned manner at the time of bending processing of the press formedplate 11. Accordingly, faults such as springback due to the bending of the plate can be prevented, thereby stabilizing the configuration of the provisionally assembled article. Thus, the stabilized configuration of the assembled article can be maintained until the brazing processing after the completion of the bending processing, resulting in enhanced dimensional accuracy and high quality. - Furthermore, in this embodiment, as shown in FIGS. 3 and 4, since the
peripheral portion 23 a of thetube insertion aperture 23 of theheader 10 is curved inwardly by burring processing, thetube 60 can be guided smoothly at the time of inserting thetube 60 into theaperture 23. Thus, the tube insertion can be performed easily. In addition, the inwardly curvedperipheral portion 23 a of thetube insertion aperture 23 increases the joining area between theperipheral portion 23 a and thetube 60, resulting in enhanced air-tightness therebetween, which in turn further enhances quality and reliability of the header. - <Second Embodiment>
- FIGS.9 to 13 show a
header 10 for use in heat exchangers according to a second embodiment of the present invention. As shown in these figures, in the same manner as in the first embodiment, the press formedplate 11 constituting theheader 10 is provided with abase wall region 21,side wall regions wall region 31 a, a second half oppositewall region 31 b and first and second reinforcingwall regions base wall region 21,tube insertion apertures 23 are provided at certain intervals. - Furthermore, in the press formed
plate 11, at the side edges of the first and second reinforcingwall regions insertion ledges plate 11. Furthermore, between the adjacenttube insertion apertures 23 in thebase wall region 21, a first insertionledge engaging aperture 25 a and a second insertionledge engaging aperture 25 b corresponding to theinsertion ledges - Each
region plate 11 is bent, so that the reinforcingregions insertion ledges regions ledge engaging apertures insertion ledges bent portions base wall 20. Thus, theheader 10 for use in heat exchangers is manufactured. - Since the other structures are the same as those of the first embodiment, the explanation will be omitted by allotting the same reference numeral to the same or corresponding portion.
- In the
header 10 for use in heat exchangers according to the second embodiment, effects similar to those of the first embodiment can be obtained. - Furthermore, in the
header 10 for use in heat exchangers according to the second embodiment, theinsertion ledges regions plate 11 are formed alternatively along the longitudinal direction of the header between the first reinforcingregion 51 a and the second reinforcingregion 51 b, and that the insertionledge engaging apertures insertion ledges wall region 51 a and the second reinforcingwall region 51 b, it is prevented that theinsertion ledges insertion ledges apertures header 10. - Furthermore, in the second embodiment, since the tip portions of the
insertion ledges bent portions base wall 20, stronger engaging status can be obtained and the number ofinsertion ledges - In cases where the structure in which the tip portions of the
insertion ledges base wall 20 is applied to the first embodiment, effects similar to those of the second embodiment can be obtained. - Now, in the aforementioned embodiments, as shown in FIGS. 6B and 11B, the tip portions of the reinforcing
walls base wall 20. However, the present invention is not limited to the above. - For example, as shown in FIG. 14A, the tip ends of the reinforcing
walls base wall 20 with the tip ends abutted thereto. - Furthermore, as shown in FIG. 14B, the outwardly bent tip portions of the reinforcing
walls base wall 20. In this case, the larger joining area between the reinforcingwalls base wall 20 can be secured, which assuredly prevents generation of faults such as poor brazing. - Furthermore, in the present invention, two tip portions of the reinforcing
walls base wall 20 by another methods other than the aforementioned methods. - For example, as shown in FIG. 14C, the reinforcing
walls base wall 20 in the state in which the tip end of the first reinforcingwall 50 a abuts against the inner surface of thebase wall 20 while theinsertion ledge 55 b of the second reinforcingwall 50 b is inserted into thebase wall 20. - Furthermore, as shown in FIG. 14D, the reinforcing
walls base wall 20 in the state in which the tip end of the first reinforcingwall 50 a abuts against the inner surface of thebase wall 20 while thebent tip portion 81 b of the second reinforcingwall 50 b abuts against thebase wall 20. - Furthermore, as shown in FIG. 14E, the reinforcing
walls base wall 20 in the state in which thebent tip portion 81 a of the first reinforcingwall 50 a abuts against the inner surface of thebase wall 20 while theinsertion ledge 55 b of the second reinforcingwall 50 b abuts against thebase wall 20. - Furthermore, in the present invention, it is not required that the tip portion of the reinforcing
walls - For example, as shown in FIG. 15A, the reinforcing
walls base wall 20 in the state in which thebent tip portions walls base wall 20 while the end portions between the bent tip portions abut against thebase wall 20. - Alternatively, as shown in FIG. 15B, the reinforcing
walls base wall 20 in the state in which thebent tip portions walls base wall 20 while theend portions 55 b between the bent tip portions are inserted into thebase wall 20. - Furthermore, in the present invention, it is possible to arbitrarily combine the aforementioned tip securing methods of reinforcing
walls - In the aforementioned embodiment, two reinforcing
walls wall region 31 a or the second half oppositewall region 31 b. In other words, one of the aforementioned reinforcingwalls - As mentioned above, in the header for use in heat exchangers according to the present invention, since the base wall, the side walls, the opposite wall and the reinforcing wall are integrally formed by bending processing, it is not necessary to perform troublesome joining processing such as brazing processing or pinching processing. Furthermore, it is possible to decrease the number of parts. Accordingly, the assembly operation can be performed easily and the manufacturing costs can be decreased. Furthermore, since the reinforcing wall is disposed between the base wall and the opposite wall, enough pressure resistance can be obtained assuredly.
- In cases where two reinforcing walls are provided, it is possible to further enhance the pressure resistance.
- Furthermore, in cases where the tube engaging cut-out portion is provided in the reinforcing wall, the positioning of the tube can be performed by engaging the end portion of the tube with the cut-out portion. As a result, there is an advantage that the insertion of the tube can be performed smoothly and the assembly operation can be performed easily.
- Furthermore, in cases where the insertion ledge formed in the reinforcing wall is inserted into and fixed thereto the insertion ledge engaging aperture of the base wall, faults such as springback due to bending processing can be prevented and the configuration of the provisionally assembled article can be stabilized. Accordingly, the dimensional accuracy can be improved and the quality can be enhanced.
- Furthermore, in cases where the insertion ledge formed at the reinforcing wall is inserted into the insertion ledge engaging aperture and the inserted tip portion is bent by caulking processing to thereby engage with the external surface of the base wall, the reinforcing wall can be fixed to the base wall more assuredly. Thus, faults such as springback can be prevented assuredly, and the configuration of the provisional header can be stabilized. Accordingly, there is advantage that higher quality can be obtained.
- Furthermore, in cases where the tip portion of the reinforcing wall is bent and secured to the inner surface of the base wall, the joining area of the reinforcing wall to the base plate can be increased. Accordingly, it becomes possible to more assuredly prevent securing faults such as brazing faults.
- Furthermore, in cases where the peripheral portion of the tube insertion aperture is curved inwardly, at the time of inserting the tube into the tube insertion aperture, the peripheral portion guides the tube. Therefore, the tube can be inserted easily. Furthermore, larger joining area between the tube and the peripheral portion of the tube insertion aperture can be obtained, resulting in enhanced air-tightness therebetween, which in turn enhances the quality and reliability.
- On the other hand, according to the method for manufacturing the header according to the present invention, the same effects as mentioned above can be obtained since the method specifies one of the manufacturing processes of the aforementioned header.
- Furthermore, according to the heat exchanger according to the present invention, the same effects as mentioned above can be obtained since the heat exchanger uses the aforementioned headers for use in heat exchangers.
- Furthermore, according to the method for manufacturing the header according to the present invention, the same effects as mentioned above can be obtained since the method uses the aforementioned headers for use in heat exchangers.
- The terms and expressions which have been employed herein are used as terms of description and not of limitation, and there is no intent, in the use of such terms and expressions, of excluding any of the equivalents of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the invention claimed.
- The header can be suitably used for a heat exchanger such as a condenser and an evaporator for use in a refrigeration system for an automobile air-conditioner.
Claims (48)
1. A header for use in heat exchangers, said header comprising:
a base wall with a plurality of tube insertion apertures for inserting heat exchanging tubes formed at predetermined intervals in a longitudinal direction of said base wall;
an opposite wall opposed to said base wall;
a pair of side walls disposed at both lateral sides of said base wall and said opposite wall and connecting said lateral sides; and
a reinforcing wall disposed between said base wall and said opposite wall along a longitudinal direction thereof and connecting said base wall to said opposite wall,
wherein said side walls are integrally formed at both lateral sides of said base wall by bending processing,
wherein a first half of said opposite wall constituting one half of said opposite wall is integrally formed at a side of one of said side walls by bending processing,
wherein a second half of said opposite wall constituting the other half of said opposite wall is integrally formed at a side of the other of said side walls by bending processing, and
wherein said reinforcing wall is integrally formed at at least one of sides of said first half of said opposite wall and said second half of said opposite wall by bending processing.
2. The header for use in heat exchangers as recited in claim 1 , wherein said reinforcing wall is integrally formed at each of said sides of said first half of said opposite wall and said second half of said opposite wall.
3. The header for use in heat exchangers as recited in claim 1 or 2, wherein a side edge of said reinforcing wall opposed to said base wall is integrally brazed to said base wall.
4. The header for use in heat exchangers as recited in claim 2 , wherein said reinforcing walls are fitted with each other and integrally brazed with each other.
5. The header for use in heat exchangers as recited in any one of claims 1 to 4 , wherein said reinforcing wall is provided with tube engaging cut-out portions formed at positions corresponding to said plurality of tube insertion apertures, whereby each end of said plurality of heat exchanging tubes inserted into said tube insertion apertures is engaged with said tube engaging cut-out portion in a positioned manner.
6. The header for use in heat exchangers as recited in any one of claims 1 to 5 , wherein said reinforcing wall is provided with insertion ledges at a base wall side edge of said reinforcing wall opposed to said base wall, wherein said base wall is provided with insertion ledge engaging apertures at positions corresponding to said insertion ledges, and wherein said insertion ledges are inserted into said insertion ledge engaging apertures and engaged therewith, respectively.
7. The header for use in heat exchangers as recited in claim 6 , wherein said insertion ledges are integrally brazed to said base wall with said insertion ledges inserted into said insertion ledge engaging apertures.
8. The header for use in heat exchangers as recited in claim 6 or 7, wherein said insertion ledges are intermittently formed at certain intervals in the longitudinal direction of said header.
9. The header for use in heat exchangers as recited in any one of claims 6 to 8 , wherein a tip portion of said insertion ledge is inserted into said insertion ledge engaging aperture, and wherein said tip portion of said insertion ledge is bent and engaged with an external surface of said base wall.
10. The header for use in heat exchangers as recited in any one of claims 1 to 9 , wherein a peripheral edge of said tube insertion aperture is bent inwardly.
11. The header for use in heat exchangers as recited in claim 1 or 2, wherein said reinforcing wall has a side edge opposed to said base wall, and wherein said side edge is abutted against an inner surface of said base wall.
12. The header for use in heat exchangers as recited in claim 11 , wherein said side edge of said reinforcing wall is integrally brazed to said base wall.
13. The header for use in heat exchangers as recited in claim 11 or 12, wherein said side edge of said reinforcing wall is abutted against said base wall continuously along a longitudinal direction of said header.
14. The header for use in heat exchangers as recited in claim 1 or 2, wherein a side edge portion of said reinforcing wall opposed to said base wall is bent outwardly to form a bent portion, and wherein said bent portion is secured to an inner surface of said base wall.
15. The header for use in heat exchangers as recited in claim 14 , wherein said bent portion of said reinforcing wall is integrally brazed to said base wall.
16. The header for use in heat exchangers as recited in claim 14 or 15, wherein said bent portion of said reinforcing wall is continuously formed along a longitudinal direction of said header.
17. The header for use in heat exchangers as recited in claim 14 or 15, wherein said bent portion of said reinforcing wall is intermittently formed at certain intervals along a longitudinal direction of said header.
18. The header for use in heat exchangers as recited in claim 17 , wherein said side edge of said reinforcing wall between said bent portions adjacent in a longitudinal direction of said header is abutted against said base wall.
19. The header for use in heat exchangers as recited in claim 17 , wherein said reinforcing wall has insertion ledges at said side edge of said reinforcing wall opposed to said base wall between said bent portions adjacent in a longitudinal direction of said header, wherein said base wall is provided with insertion ledge engaging apertures at positions corresponding to said insertion ledges, and wherein said insertion ledges are inserted into said insertion ledge engaging apertures and engaged therewith.
20. The header for use in heat exchangers as recited in claim 2 , wherein one of said reinforcing walls is provided with insertion ledges at a side edge opposed to said base wall, wherein said base wall is provided with insertion ledge engaging apertures at positions corresponding to said insertion ledges, wherein said insertion ledges are inserted into said insertion ledge engaging apertures and engaged therewith, and wherein a side edge of the other of said reinforcing walls opposed to said base wall is abutted against an inner surface of said base wall.
21. The header for use in heat exchangers as recited in claim 2 , wherein one of said reinforcing walls is provided with insertion ledges at a side edge opposed to said base wall, wherein said base wall is provided with insertion ledge engaging apertures at positions corresponding to said insertion ledges, wherein said insertion ledges are inserted into said insertion ledge engaging apertures and engaged therewith, and wherein a side edge portion of the other of said reinforcing walls opposed to said base wall has an outwardly bent portion and said bent portion is secured to an inner surface of said base wall.
22. The header for use in heat exchangers as recited in claim 21 , wherein said insertion ledges of said one of reinforcing walls are formed at certain intervals in a longitudinal direction of said header.
23. The header for use in heat exchangers as recited in claim 21 , wherein said bent portions of said the other reinforcing wall are formed at certain intervals in a longitudinal direction of said header.
24. The header for use in heat exchangers as recited in claim 2 , wherein said one of said reinforcing walls is disposed such that a side edge of said one of said reinforcing walls opposed to said base wall is abutted against said base wall, and wherein said the other of said reinforcing walls is disposed such that a side edge portion of said the other of said reinforcing walls is bent outwardly to form a bent portion and said bent portion is secured to an inner surface of said base wall.
25. The header for use in heat exchangers as recited in claim 24 , wherein said bent portion of said the other of said reinforcing walls is formed at certain intervals in a longitudinal direction of said header.
26. A header for use in heat exchangers, said header comprising:
a base wall with a plurality of tube insertion apertures for inserting heat exchanging tubes formed at predetermined intervals in a longitudinal direction of said base wall;
an opposite wall opposed to said base wall;
a pair of side walls disposed at both lateral sides of said base wall and said opposite wall and connecting said lateral sides; and
a reinforcing wall disposed between said base wall and said opposite wall along a longitudinal direction thereof and connecting said base wall to said opposite wall,
wherein said side walls are integrally formed at both lateral sides of said base wall by bending processing,
wherein a first half of said opposite wall constituting one half of said opposite wall is integrally formed at a side of one of said side walls by bending processing,
wherein a second half of said opposite wall constituting the other half of said opposite wall is integrally formed at a side of the other of said side walls by bending processing, and
wherein said reinforcing wall is integrally formed at respective sides of said first half of said opposite wall and said second half of said opposite wall by bending processing,
wherein insertion ledges are formed at certain intervals in a longitudinal direction of said header at side edges of said reinforcing walls opposed to said base wall,
wherein said insertion ledges of said one of said reinforcing walls and said insertion ledges of said the other of said reinforcing walls are disposed alternatively along said longitudinal direction of said header,
wherein said base wall is provided with insertion ledge engaging apertures at positions corresponding to said insertion ledges, and
wherein said insertion ledges are inserted into corresponding insertion ledge engaging apertures and engaged therewith.
27. The header for use in heat exchangers as recited in claim 26 , wherein said insertion ledge engaging apertures are formed along said longitudinal direction of said header in a zigzag manner.
28. The header for use in heat exchangers as recited in claim 26 or 27, wherein said tip portion of said insertion ledge is bent to form a bent portion with said insertion ledge inserted into said insertion ledge engaging aperture and said bent portion is engaged with an external surface of said base wall.
29. The header for use in heat exchangers as recited in claim 28 , wherein said bent portion is formed by bending said tip portion of said insertion ledge by caulking processing.
30. A method for manufacturing a header for use in heat exchangers, said header including a base wall with a plurality of tube insertion apertures for inserting heat exchanging tubes formed at predetermined intervals in a longitudinal direction of said base wall, an opposite wall opposed to said base wall, a pair of side walls disposed at both lateral sides of said base wall and said opposite wall and connecting said lateral sides, and a reinforcing wall disposed between said base wall and said opposite wall along a longitudinal direction thereof and connecting said base wall with said opposite wall, said method comprising:
a step for preparing a formed plate, said formed plate including a base wall region having said plurality of tube insertion apertures and extending in a longitudinal direction of said formed plate, a pair of side wall regions formed at both lateral sides of said base wall region and extending in said longitudinal direction, a first half region of an opposite wall formed at one of lateral sides of said base wall 1 region and extending in said longitudinal direction, a second half region of an opposite wall formed at the other of lateral sides of said base wall region and extending in said longitudinal direction, and a reinforcing wall region formed at at least one of said first half and second half regions of said opposite wall and extending in said longitudinal direction;
a step for bending said reinforcing wall region relative to said first half region of said opposite wall and/or said second half region of said opposite wall;
a step for bending said first half region of said opposite wall and/or said second half region of said opposite wall relative to said side wall regions; and
a step for bending said side wall regions relative to said base wall region, to thereby obtain said header in which said base wall, said side walls, said opposite wall and said reinforcing wall are constituted by said base wall region, said side wall regions, said opposite wall region and said reinforcing wall region, respectively.
31. The method for manufacturing a header for use in heat exchangers as recited in claim 30 , wherein, in said step for preparing said formed plate, said reinforcing wall region is formed at each side of said first half region and said second half region of said opposite wall.
32. The method for manufacturing a header for use in heat exchangers as recited in claim 30 , wherein, in said step for preparing said formed plate, tube engaging cut-out portions are formed at portions of said reinforcing wall corresponding to said plurality of tube insertion apertures such that ends of said heat exchanging tubes inserted in said tube insertion apertures are engaged with said engaging cut-out portions in a positioned manner.
33. The method for manufacturing a header for use in heat exchangers as recited in any one of claims 30 to 32 , wherein, in said step for preparing said formed plate, insertion ledges are formed at a base wall side edge of said reinforcing wall and insertion ledge engaging apertures are formed at positions of said base wall corresponding to said insertion ledges, further comprising a step of inserting said insertion ledges into said insertion ledge engaging apertures.
34. The method for manufacturing a header for use in heat exchangers as recited in any one of claims 30 to 33 , wherein, in said step for preparing said formed plate, said formed plate is formed by die-cutting and pressing a brazing sheet with a brazing layer clad on at least one surface thereof.
35. The method for manufacturing a header for use in heat exchangers as recited in claim 34 , further comprising a step of brazing an assembly obtained by said bending steps in a furnace.
36. A heat exchanger, comprising:
a pair of headers for use in heat exchangers; and
a plurality of heat exchanging tubes disposed in parallel with each other between said pair of headers with opposite ends thereof communicated with said headers,
wherein at least one of said pair of headers includes:
a base wall with a plurality of tube insertion apertures for inserting said heat exchanging tubes formed at predetermined intervals in a longitudinal direction of said base wall;
an opposite wall opposed to said base wall;
a pair of side walls disposed at both lateral sides of said base wall and said opposite wall and connecting said lateral sides; and
a reinforcing wall disposed between said base wall and said opposite wall along a longitudinal direction thereof and connecting said base wall to said opposite wall,
wherein said side walls are integrally formed at both lateral sides of said base wall by bending processing,
wherein a first half of said opposite wall constituting one half of said opposite wall is integrally formed at a side of one of said side walls by bending processing,
wherein a second half of said opposite wall constituting the other half of said opposite wall is integrally formed at a side of the other of said side walls by bending processing, and
wherein said reinforcing wall is integrally formed at at least one of sides of said first half of said opposite wall and said second half of said opposite wall by bending processing.
37. The exchanger as recited in claim 36 , wherein said reinforcing wall is provided with tube engaging cut-out portions formed at positions corresponding to said plurality of tube insertion apertures, whereby each end of said plurality of heat exchanging tubes inserted into said tube insertion apertures is engaged with said tube engaging cut-out portion in a positioned manner.
38. The exchanger as recited in claim 36 or 37, wherein said each end of said plurality of heat exchanging tubes is brazed to said header.
39. A heat exchanger, comprising:
a pair of headers for use in heat exchangers; and
a plurality of heat exchanging tubes disposed in parallel with each other between said pair of headers with opposite ends thereof communicated with said headers,
wherein at least one of said pair of headers includes:
a base wall with a plurality of tube insertion apertures for inserting said heat exchanging tubes formed at predetermined intervals in a longitudinal direction of said base wall;
an opposite wall opposed to said base wall;
a pair of side walls disposed at both lateral sides of said base wall and said opposite wall and connecting said lateral sides; and
reinforcing walls disposed between said base wall and said opposite wall along a longitudinal direction thereof and connecting said base wall to said opposite wall,
wherein said side walls are integrally formed at both lateral sides of said base wall by bending processing,
wherein a first half of said opposite wall constituting one half of said opposite wall is integrally formed at a side of one of said side walls by bending processing,
wherein a second half of said opposite wall constituting the other half of said opposite wall is integrally formed at a side of the other of said side walls by bending processing,
wherein each of said reinforcing walls is integrally formed at each of sides of said first half of said opposite wall and said second half of said opposite wall by bending processing,
wherein each of said reinforcing walls is provided with insertion ledges at a base wall side edge of said reinforcing wall opposed to said base wall at predetermined intervals in a longitudinal direction of said header,
wherein said insertion ledges of one of said reinforcing walls and said insertion ledges of the other of said reinforcing walls are disposed alternatively in said longitudinal direction of said header,
wherein said base wall is provided with insertion ledge engaging apertures at positions corresponding to said insertion ledges, and
wherein said insertion ledges are inserted into said insertion ledge engaging apertures and engaged therewith, respectively.
40. The exchanger as recited in claim 39 , wherein said reinforcing wall is provided with tube engaging cut-out portions formed at positions corresponding to said plurality of tube insertion apertures, whereby each end of said plurality of heat exchanging tubes inserted into said tube insertion apertures is engaged with said tube engaging cut-out portion in a positioned manner.
41. The exchanger as recited in claim 39 or 40, wherein said each end of said plurality of heat exchanging tubes is brazed to said header.
42. The exchanger as recited in any one of claims 39 to 41 , wherein said insertion ledge engaging apertures are formed in a zigzag manner in said longitudinal direction of said header.
43. A manufacturing method of a heat exchanger, the method comprising:
a step for preparing a pair of headers for use in heat exchangers;
a step for preparing a plurality of heat exchanging tubes; and
a step for disposing said plurality of heat exchanging tubes in parallel with each other between said pair of headers with opposite ends thereof communicated with said headers,
wherein at least one of said pair of headers includes:
a base wall with a plurality of tube insertion apertures for inserting heat exchanging tubes formed at predetermined intervals in a longitudinal direction of said base wall;
an opposite wall opposed to said base wall;
a pair of side walls disposed at both lateral sides of said base wall and said opposite wall and connecting said lateral sides; and
a reinforcing wall disposed between said base wall and said opposite wall along a longitudinal direction thereof and connecting said base wall to said opposite wall,
wherein said side walls are integrally formed at both lateral sides of said base wall by bending processing,
wherein a first half of said opposite wall constituting one half of said opposite wall is integrally formed at a side of one of said side walls by bending processing,
wherein a second half of said opposite wall constituting the other half of said opposite wall is integrally formed at a side of the other of said side walls by bending processing, and
wherein said reinforcing wall is integrally formed at at least one of sides of said first half of said opposite wall and said second half of said opposite wall by bending processing.
44. The manufacturing method of a heat exchanger method as recited in claim 43 , wherein said step for preparing said header comprises:
a step for preparing a formed plate, said formed plate including a base wall region having said plurality of tube insertion apertures and extending in a longitudinal direction of said formed plate, a pair of side wall regions formed at both lateral sides of said base wall region and extending in said longitudinal direction, a first half region of an opposite wall formed at one of lateral sides of said base wall 1 region and extending in said longitudinal direction, a second half region of an opposite wall formed at the other of lateral sides of said base wall region and extending in said longitudinal direction, and a reinforcing wall region formed at at least one of said first half and second half regions of said opposite wall and extending in said longitudinal direction;
a step for bending said reinforcing wall region relative to said first half region of said opposite wall and/or said second half region of said opposite wall;
a step for bending said first half region of said opposite wall and/or said second half region of said opposite wall relative to said side wall regions; and
a step for bending said side wall regions relative to said base wall region.
45. The manufacturing method of a heat exchanger as recited in claim 43 or 44, wherein said each end of said plurality of heat exchanging tubes is brazed to said header.
46. A manufacturing method of a heat exchanger, the method comprising:
a step for preparing a pair of headers for use in heat exchangers;
a step for preparing a plurality of heat exchanging tubes; and
a step for disposing said plurality of heat exchanging tubes in parallel with each other between said pair of headers with opposite ends thereof communicated with said headers,
wherein at least one of said pair of headers includes:
a base wall with a plurality of tube insertion apertures for inserting heat exchanging tubes formed at predetermined intervals in a longitudinal direction of said base wall;
an opposite wall opposed to said base wall;
a pair of side walls disposed at both lateral sides of said base wall and said opposite wall and connecting said lateral sides; and
reinforcing walls disposed between said base wall and said opposite wall along a longitudinal direction thereof and connecting said base wall to said opposite wall,
wherein said side walls are integrally formed at both lateral sides of said base wall by bending processing,
wherein a first half of said opposite wall constituting one half of said opposite wall is integrally formed at a side of one of said side walls by bending processing,
wherein a second half of said opposite wall constituting the other half of said opposite wall is integrally formed at a side of the other of said side walls by bending processing,
wherein each of said reinforcing walls is integrally formed at each of sides of said first half of said opposite wall and said second half of said opposite wall by bending processing,
wherein each of said reinforcing walls is provided with insertion ledges at a base wall side edge of said reinforcing wall opposed to said base wall at predetermined intervals in a longitudinal direction of said header,
wherein said insertion ledges of one of said reinforcing walls and said insertion ledges of the other of said reinforcing walls are disposed alternatively in said longitudinal direction of said header,
wherein said base wall is provided with insertion ledge engaging apertures at positions corresponding to said insertion ledges, and
wherein said insertion ledges are inserted into said insertion ledge engaging apertures and engaged therewith, respectively.
47. The manufacturing method of a heat exchanger method as recited in claim 46 , wherein said step for preparing said header comprises:
a step for preparing a formed plate, said formed plate including a base wall region having said plurality of tube insertion apertures and extending in a longitudinal direction of said formed plate, a pair of side wall regions formed at both lateral sides of said base wall region and extending in said longitudinal direction, a first half region of an opposite wall formed at one of lateral sides of said base wall 1 region and extending in said longitudinal direction, a second half region of an opposite wall formed at the other of lateral sides of said base wall region and extending in said longitudinal direction, and a reinforcing wall region formed at at least one of said first half and second half regions of said opposite wall and extending in said longitudinal direction;
a step for bending said reinforcing wall region relative to said first half region of said opposite wall and/or said second half region of said opposite wall;
a step for bending said first half region of said opposite wall and/or said second half region of said opposite wall relative to said side wall regions; and
a step for bending said side wall regions relative to said base wall region.
48. The manufacturing method of a heat exchanger as recited in claim 46 or 47, wherein said each end of said plurality of heat exchanging tubes is brazed to said header.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/472,486 US20040182558A1 (en) | 2001-03-29 | 2002-03-28 | Header for use in heat exchanger, heat exchanger and method for manufacturing the same |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-95242 | 2001-03-29 | ||
JP2001095242 | 2001-03-29 | ||
US30269101P | 2001-07-05 | 2001-07-05 | |
PCT/JP2002/003154 WO2002079708A2 (en) | 2001-03-29 | 2002-03-28 | Header for use in heat exchangers, heat exchanger and method for manufacturing the same |
US10/472,486 US20040182558A1 (en) | 2001-03-29 | 2002-03-28 | Header for use in heat exchanger, heat exchanger and method for manufacturing the same |
Publications (1)
Publication Number | Publication Date |
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US20040182558A1 true US20040182558A1 (en) | 2004-09-23 |
Family
ID=26612506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/472,486 Abandoned US20040182558A1 (en) | 2001-03-29 | 2002-03-28 | Header for use in heat exchanger, heat exchanger and method for manufacturing the same |
Country Status (7)
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US (1) | US20040182558A1 (en) |
EP (1) | EP1485665A4 (en) |
KR (1) | KR20040005902A (en) |
CN (1) | CN1599859A (en) |
CZ (1) | CZ20032624A3 (en) |
TW (1) | TW534974B (en) |
WO (1) | WO2002079708A2 (en) |
Cited By (9)
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US20050230093A1 (en) * | 2002-11-27 | 2005-10-20 | Uwe Forster | Heat exchanger |
US20060162919A1 (en) * | 2002-08-09 | 2006-07-27 | Showa Denko K.K. | Flat tube and process for producing heat exchanger with use of the flat tube |
EP2098313A1 (en) | 2008-03-06 | 2009-09-09 | Delphi Technologies, Inc. | A heat exchanger manifold and method of forming a heat exchanger manifold |
US20100025027A1 (en) * | 2008-07-29 | 2010-02-04 | Daniel Borst | Heat exchanger with collecting tube, collecting tube, and method for producing the same |
US20110011376A1 (en) * | 2007-08-30 | 2011-01-20 | Meshenky Steven P | Exhaust gas recirculation system and method of operating the same |
US20120304726A1 (en) * | 2011-05-30 | 2012-12-06 | Honda Motor Co., Ltd. | Method of manufacturing pulley cover in continuously variable transmission |
CN103769468A (en) * | 2012-10-19 | 2014-05-07 | 张荣伟 | Production method of cooling patch plug and product thereof |
US10247481B2 (en) | 2013-01-28 | 2019-04-02 | Carrier Corporation | Multiple tube bank heat exchange unit with manifold assembly |
US10337799B2 (en) | 2013-11-25 | 2019-07-02 | Carrier Corporation | Dual duty microchannel heat exchanger |
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AU2003250891A1 (en) * | 2002-07-05 | 2004-01-23 | Behr Gmbh And Co. Kg | Heat exchanger in particular an evaporator for a vehicle air-conditioning unit |
EP1447636A1 (en) * | 2003-02-11 | 2004-08-18 | Delphi Technologies, Inc. | Heat exchanger |
ITMC20030037A1 (en) * | 2003-04-08 | 2004-10-09 | Laminox Srl | PROCEDURE FOR THE PRODUCTION OF HOT WATER BATH WATER RADIATORS |
KR100722693B1 (en) * | 2005-02-25 | 2007-05-29 | 한국델파이주식회사 | Heat exchanger |
KR100644135B1 (en) * | 2005-11-14 | 2006-11-10 | 주식회사 두원공조 | Header pipe of heat exchanger |
KR101243666B1 (en) * | 2007-02-14 | 2013-03-14 | 한라공조주식회사 | Evaporator |
KR101304865B1 (en) * | 2007-02-14 | 2013-09-11 | 한라비스테온공조 주식회사 | Evaporator |
KR101039980B1 (en) * | 2008-08-28 | 2011-06-09 | 주식회사 두원공조 | header of heat exchanger combined with tube of double row |
WO2015025365A1 (en) * | 2013-08-20 | 2015-02-26 | 三菱電機株式会社 | Heat exchanger, air conditioner, and refrigeration cycle device |
CN103486774A (en) * | 2013-09-24 | 2014-01-01 | 浙江基力思汽车空调有限公司 | Roll-pressing collecting pipe parallel flow evaporator |
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JPH0579790A (en) * | 1991-09-18 | 1993-03-30 | Zexel Corp | Heat exchanger |
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JP3829499B2 (en) * | 1998-09-29 | 2006-10-04 | 株式会社デンソー | Heat exchanger |
DE19920102B4 (en) * | 1999-05-03 | 2009-01-02 | Behr Gmbh & Co. Kg | Multi-chamber tube and heat exchanger arrangement for a motor vehicle |
EP1065453B1 (en) | 1999-07-02 | 2004-05-06 | Denso Corporation | Refrigerant evaporator with refrigerant distribution |
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2002
- 2002-03-28 US US10/472,486 patent/US20040182558A1/en not_active Abandoned
- 2002-03-28 EP EP02708722A patent/EP1485665A4/en not_active Withdrawn
- 2002-03-28 WO PCT/JP2002/003154 patent/WO2002079708A2/en active Application Filing
- 2002-03-28 KR KR10-2003-7012649A patent/KR20040005902A/en not_active Application Discontinuation
- 2002-03-28 CN CNA028070240A patent/CN1599859A/en active Pending
- 2002-03-28 CZ CZ20032624A patent/CZ20032624A3/en unknown
- 2002-03-29 TW TW091106360A patent/TW534974B/en not_active IP Right Cessation
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US5174373A (en) * | 1990-07-13 | 1992-12-29 | Sanden Corporation | Heat exchanger |
US6272881B1 (en) * | 1998-04-03 | 2001-08-14 | Denso Corporation | Refrigerant evaporator and manufacturing method for the same |
US6259359B1 (en) * | 1999-04-06 | 2001-07-10 | Yazaki Corporation | Rear monitoring system for vehicle |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060162919A1 (en) * | 2002-08-09 | 2006-07-27 | Showa Denko K.K. | Flat tube and process for producing heat exchanger with use of the flat tube |
US7121332B2 (en) * | 2002-11-27 | 2006-10-17 | Behr Gmbh & Co. Kg | Heat exchanger |
US20050230093A1 (en) * | 2002-11-27 | 2005-10-20 | Uwe Forster | Heat exchanger |
US8671921B2 (en) * | 2007-08-30 | 2014-03-18 | Modine Manufacturing Company | Exhaust gas recirculation system and method of operating the same |
US20110011376A1 (en) * | 2007-08-30 | 2011-01-20 | Meshenky Steven P | Exhaust gas recirculation system and method of operating the same |
EP2098313A1 (en) | 2008-03-06 | 2009-09-09 | Delphi Technologies, Inc. | A heat exchanger manifold and method of forming a heat exchanger manifold |
US20100025027A1 (en) * | 2008-07-29 | 2010-02-04 | Daniel Borst | Heat exchanger with collecting tube, collecting tube, and method for producing the same |
US8474517B2 (en) * | 2008-07-29 | 2013-07-02 | Modine Manufacturing Company | Heat exchanger with collecting tube, collecting tube, and method for producing the same |
US20120304726A1 (en) * | 2011-05-30 | 2012-12-06 | Honda Motor Co., Ltd. | Method of manufacturing pulley cover in continuously variable transmission |
US9021851B2 (en) * | 2011-05-30 | 2015-05-05 | Honda Motor Co., Ltd. | Method of manufacturing pulley cover in continuously variable transmission |
CN103769468A (en) * | 2012-10-19 | 2014-05-07 | 张荣伟 | Production method of cooling patch plug and product thereof |
US10247481B2 (en) | 2013-01-28 | 2019-04-02 | Carrier Corporation | Multiple tube bank heat exchange unit with manifold assembly |
US10337799B2 (en) | 2013-11-25 | 2019-07-02 | Carrier Corporation | Dual duty microchannel heat exchanger |
Also Published As
Publication number | Publication date |
---|---|
KR20040005902A (en) | 2004-01-16 |
TW534974B (en) | 2003-06-01 |
WO2002079708A2 (en) | 2002-10-10 |
CN1599859A (en) | 2005-03-23 |
EP1485665A2 (en) | 2004-12-15 |
WO2002079708A3 (en) | 2004-10-07 |
CZ20032624A3 (en) | 2004-08-18 |
EP1485665A4 (en) | 2008-06-25 |
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Legal Events
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AS | Assignment |
Owner name: SHOWA DENKO K.K., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WATANABE, FUTOSHI;KAWAMATA, YASUJI;HOSHINO, RYOICHI;AND OTHERS;REEL/FRAME:014988/0299 Effective date: 20031022 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |