Heat Exchanger Structure Patents (Class 228/183)
-
Publication number: 20030038164Abstract: A method for manufacturing a cooling element comprising a housing part and ceramic lining elements arranged on the housing part surface. The ceramic lining elements (2) are connected to the element housing part (1) by using in the joint between the lining elements and the housing part a soldering/brazing agent, wherein at least the junction area is heated at least up to the melting temperature of the soldering/brazing agent, so that there is created a joint with a good thermal contact with the element housing part (1) and a ceramic lining element (2). The invention also relates to a cooling element.Type: ApplicationFiled: September 18, 2002Publication date: February 27, 2003Inventors: Risto Saarinen, Yrjo Leppanen
-
Patent number: 6523605Abstract: There is disclosed a heat exchanger made of an aluminum alloy having a radiator part (10) and an oil cooler part (11) in combination and manufactured integrally by the brazing method, wherein a refrigerant tank (13) for covering and sealing the oil cooler part is made of an aluminum alloy, an aluminum alloy containing Si in an amount from more than 7.0 wt % to 12.0 wt %, Fe in an amount from more than 0.05 wt % to 0.5 wt %, Cu in an amount from more than 0.4 wt % to 8.0 wt %, Zn in an amount from more than 0.5 wt % to 10.0 wt %, and the balance of aluminum and inevitable impurities is used as a filler material of brazing sheets that are used for the oil cooler part and are brazed in the tank, and the refrigerant tank is assembled integrally with the radiator part and the oil cooler part by brazing with the brazing material.Type: GrantFiled: March 12, 2001Date of Patent: February 25, 2003Assignees: The Furukawa Electric Co., Ltd., Denso CorporationInventors: Takeyoshi Doko, Koji Okada, Takeshi Iguchi, Takaaki Sakane, Yoshihiro Kinoshita, Taketoshi Toyama, Akira Uchikawa, Satoshi Nohira, Homare Koutate
-
Publication number: 20030015573Abstract: A method for manufacturing an aluminum alloy fin material for brazing, which has the steps of:Type: ApplicationFiled: May 20, 2002Publication date: January 23, 2003Inventors: Akira Kawahara, Takeyoshi Doko
-
Publication number: 20030001000Abstract: The invention relates to a method of manufacturing heat transfer tubes for a heat exchanger such as an automobile radiator. The tubes are preferably formed of copper or a copper alloy. A sheet of the material is folded into a shape that resembles a B and is brazed together with a brazing material that is free from flux. The brazing material is in the form of a foil or paste. The paste typically includes a powder filler, a binder, and a carrier, which may be a liquid or a wax.Type: ApplicationFiled: June 28, 2001Publication date: January 2, 2003Inventor: Yoram Leon Shabtay
-
Patent number: 6494254Abstract: A tube for a heat exchanger consists of a folded metal strip having an outer face covered with a plating of brazing alloy (31) and including at least one folded border (28) having a sheared edge bearing on an inner face (34) of the metal strip. The metal strip is folded by passing through a series of successive rollers. The sheared edge is covered with a layer of brazing alloy (31) which has advantageously been pushed back by the rollers from the outer surface towards the sheared edge. According to the method, the metal strip is made to pass between a series of rollers, each roller including a surface which exhibits an inclination with respect to the rotational axle of the rollers, the inclinations of the successive rollers continually increasing.Type: GrantFiled: June 20, 2001Date of Patent: December 17, 2002Assignee: Valeo Thermique MoteurInventor: Jean-Louis Laveran
-
Publication number: 20020150788Abstract: A process is disclosed for brazing plate/plate and plate/fin multi-channeled structures using an amorphous brazing foil as a brazing filler met between the parts in order to form uniform joints having optimal dimensions, shape and strength. The parts are assembled in an unconstrained stack, and a controlled load is applied to the top of the stack. The stack is then heated to a temperature at which the interlayer melts and reacts with the base metal to form the joints. The stack is cooled resulting in a brazed structure having the desired characteristics, wherein the strength of the structure is equal to the underlying strength of the base metal.Type: ApplicationFiled: October 25, 1999Publication date: October 17, 2002Inventors: ANATOL RABINKIN, NICHOLAS DECRISTOFARO
-
Patent number: 6441338Abstract: A model building apparatus includes a beam delivery module and a stage movable in the X, Y and Z directions. A feedstock holding mechanism for the model building apparatus enables the model building apparatus to corrugate the feedstock into a latticed layer. The feedstock holding mechanism includes a feeder housing a spool of feedstock and jaws having push-down arms and side-holding arms. Engaging and disengaging of the feedstock by the jaws while moving the table allows for forming a latticed layer of feedstock that is several times thicker than the thickness of the feedstock. Reducing the total number of layers that comprise the model significantly increases the speed of constructing models that do not require solid walls. The latticed layers may be formed in a continuous process without cutting the feedstock prior to adding a new layer of feedstock, thereby improving the quality of the lattice structure due to less cutting and starting of the feedstock.Type: GrantFiled: April 10, 2000Date of Patent: August 27, 2002Inventor: Joshua E. Rabinovich
-
Patent number: 6422451Abstract: A method of interconnecting components (10, 16) of aluminium having a purity of at least 95%, the method comprising brazing the components (10, 16) together and then surface treating the assembled componetns (10, 16) by subjecting them to a Bohmitting procedure.Type: GrantFiled: March 14, 2001Date of Patent: July 23, 2002Assignee: GEA Spiro-Gills Ltd.Inventors: Peter Neil Roy Bendall, Steve Robert Williams
-
Patent number: 6412174Abstract: During the course of bending and deforming a strip-shaped metal plate in multiple stages through use of a press roller, to thereby constitute a tube base having a closed cross section, slime-like flux is applied to solely the portions of the metal plate to be brazed, and the tube base is heated in a heating furnace, to thereby braze the portions to be brazed. Accordingly, waste of the flux is eliminated. Further, flux coating can be performed on a tube forming line, thus simplifying facilities.Type: GrantFiled: July 28, 1999Date of Patent: July 2, 2002Assignee: Calsonic Kansei CorporationInventors: Makoto Kawano, Ryoji Matsunami, Tatsuya Fujiyoshi
-
Patent number: 6412547Abstract: Thermally induced stress tending to cause breakage or leakage at tube to header joints in a heat exchanger is eliminated by placing lines of weakening in the side plates conventionally employed in such heat exchanger prior to subjecting the heat exchanger to brazing.Type: GrantFiled: October 4, 2000Date of Patent: July 2, 2002Assignee: Modine Manufacturing CompanyInventor: Nicholas R. Siler
-
Patent number: 6347452Abstract: A method of manufacturing a heat sink for an inverter that utilizes a housing with a porous metallic interior formed from a large plurality of metal balls bonded together to provide a plurality of fluid flow paths. The metal balls serve as heat sinks to dissipate the heat in the fluid that flows through the heat sink. The metal balls must therefore be in thermally conductive contact with each other, and the bond area between the balls must be as large as is feasible to provide a sufficient heat path for the heat from the fluid. The heat sink is intended to be sued with an inverter for an electric motor, so the heat sink housing must be formed from molybdenum to accommodate mounting of circuitry. In order to be susceptible to receiving soldered components the molybdenum surface is nickel plated. The porous metal medium for the heat sink is formed from small (approximately {fraction (3/32)}″ diameter) copper balls.Type: GrantFiled: November 7, 2000Date of Patent: February 19, 2002Assignee: United Defense LPInventors: Craig Joseph, Kelly W. Arnold
-
Publication number: 20020003161Abstract: Fluoride-based flux is uniformly dispersed in and mixed with synthetic resin, which has fluidity at room temperature and sublimes at a temperature lower than a brazing temperature, so as to constitute 40 to 70 wt. % of the mixture, thereby producing coating material. This coating material is applied to coating belts which undergo rotation and is transferred from the coating belts to the surface of the aluminum material. The coating material has high viscosity and stably adheres to the transferred areas.Type: ApplicationFiled: August 20, 2001Publication date: January 10, 2002Inventors: Makoto Kouno, Ryoji Matsunami, Tatsuya Fujiyoshi
-
Patent number: 6325276Abstract: Fluoride-based flux is uniformly dispersed in and mixed with synthetic resin, which has fluidity at room temperature and sublimes at a temperature lower than a brazing temperature, so as to constitute 40 to 70 wt. % of the mixture, thereby producing coating material. This coating material is applied to coating belts which undergo rotation and is transferred from the coating belts to the surface of the aluminum material. The coating material has high viscosity and stably adheres to the transferred areas.Type: GrantFiled: July 28, 1999Date of Patent: December 4, 2001Assignee: Calsonic Kansei CorporationInventors: Makoto Kawano, Ryoji Matsunami, Tatsuya Fujiyoshi
-
Patent number: 6325138Abstract: An article having a first member formed from a first metal and a second member connected with the first member at a contact area. The second member is formed from a second metal having high reduction reaction kinetics and galvanic corrosion driving force relative the first member, wherein the second metal is more noble than the first metal. A material for substantially eliminating the galvanic corrosion problem by reducing the reduction reaction kinetics of the second metal in the presence of an electrolyte is provided between the first and second metals. In a preferred embodiment, the article is a heat exchanger wherein the first member is a fin collar and the second member a tube and the material for reducing is a coating on the tube has low reduction reaction kinetics relative to copper for reducing corrosion activities between the tube and fin collar.Type: GrantFiled: February 26, 1999Date of Patent: December 4, 2001Assignee: Carrier CorporationInventors: Thomas J. Garosshen, Sandra J. Downey, Daniel P. Gaffaney
-
Publication number: 20010032715Abstract: The present invention discloses a method of manufacturing a combination heat sink having a best heat transfer efficiency and a combination heat sink made thereby. The present method comprises steps (a) to (d). In step (a), the plurality of radiating fins are piled up by sparing the radiating fins apart from each other in a substantially parallel manner with the bottom edges thereof being oriented in a same direction. In step (b), a recess is formed on the top surface of the common surface. In step (c), a heat-conductive brazing alloy is applied to the recess of the common surface. In step (d), the plurality of radiating fins are joined with the common base by seating the bottom edges of the fins onto the recess of the common base and heating the brazing alloy.Type: ApplicationFiled: April 19, 2001Publication date: October 25, 2001Applicant: NEW CENTURY TECHNOLOGY CO., LTD.Inventor: Kuo-Chung Peng
-
Patent number: 6305595Abstract: A die set for welding a panel like heat pipe to a heat sink, by the die set used in welding, the heat pipe with extremely high heat conductivity is effectively combined with the heat sink for use. Thereby, the heat sink can have better heat-conducting efficiency and working of it is fast and convenient. The die set includes a first and a second die seat. The first die seat is placed under a heat conductive bottom plate, and the top thereof has a first frame-like stub of which the top surface has a lot of protruding granules. The second die seat is placed above a heat conductive top plate, and the bottom thereof has a second frame-like stub (opposite to the first die seat) of which the bottom surface also has a lot of protruding granules. The top plate is lapped over the bottom plate with a connecting frame therebetween in opposition to and having a shape similar to that of any of the first and second frame-like stubs.Type: GrantFiled: March 17, 2000Date of Patent: October 23, 2001Inventor: Yang-Shiau Chen
-
Patent number: 6300591Abstract: A method of laser welding a planar metal surface to a cylindrical metal surface is provided, first placing a planar metal surface into approximate contact with a cylindrical metal surface to form a juncture area to be welded, the planar metal surface and cylindrical metal surface thereby forming an acute angle of contact. A laser beam, produced, for example, by a Nd:YAG pulsed laser, is focused through the acute angle of contact at the juncture area to be welded, with the laser beam heating the juncture area to a welding temperature to cause welding to occur between the planar metal surface and the cylindrical metal surface. Both the planar metal surface and cylindrical metal surface are made from a reflective metal, including copper, copper alloys, stainless steel alloys, aluminum, and aluminum alloys.Type: GrantFiled: March 23, 2000Date of Patent: October 9, 2001Assignee: Sandia CorporationInventors: Phillip W. Fuerschbach, A. Roderick Mahoney, John O Milewski
-
Publication number: 20010023889Abstract: A method of interconnecting components (10, 16) of aluminum having a purity of at least 95%, the method comprising brazing the components (10, 16) together and then surface treating the assembled components (10, 16) by subjecting them to a Bohmitting procedure.Type: ApplicationFiled: March 14, 2001Publication date: September 27, 2001Inventors: Peter Neil Roy Bendall, Steve Robert Williams
-
Patent number: 6257483Abstract: Disclosed is a nickel-based brazing material obtained by adding to powdery brazing nickel a powder of at least one metal selected from the group consisting of nickel, chromium, nickel-chromium alloys, and SUS (stainless steel) in an amount of from 2 to 10% by weight, excluding 10% by weight, based on the nickel-based brazing material, followed by mixing.Type: GrantFiled: October 9, 1998Date of Patent: July 10, 2001Assignees: Calsonic Corporation, Tokyo Radiator Mfg. Co., Ltd.Inventor: Junpei Inaba
-
Patent number: 6234243Abstract: The invention involves a heat exchanger assembly comprising at least one aluminum based tube including magnesium, an aluminum based cladding, and at least one aluminum based component disposed adjacent the cladding. A brazing flux is applied to a joint between the cladding and the component to facilitate brazing in an ambient atmosphere. An aluminum based lithium enriched layer is disposed between the tube and the cladding to scavenge sufficient oxygen from the ambient atmosphere to form an effective barrier against the defusion of magnesium from the tube.Type: GrantFiled: December 14, 1999Date of Patent: May 22, 2001Assignee: Visteon Global Technologies, Inc.Inventors: Nagendra Narayana Murching, Timothy Van Evans
-
Patent number: 6234377Abstract: A brazing composition for aluminum materials capable of functioning as a flux and a brazing material with a single component and providing a solid brazed joint exhibiting little local fusion. The brazing composition for aluminum materials which has the function of removing the oxide film on the surface of the aluminum material to be joined at a temperature lower than the melting point of the aluminum material and forming a eutectic aluminum alloy braze which fuses at such a low temperature by reaction with the aluminum materials, wherein the brazing composition comprises a first powder comprising at least one or more M—Si—F compounds comprising, in addition to at least Si and F, hydrogen or an alkaline metal or hydrates thereof or comprises this first powder as an component.Type: GrantFiled: June 30, 1999Date of Patent: May 22, 2001Assignees: Denso Corporation, Sumitomo Light Metal Industries, Ltd.Inventors: Shoei Teshima, Koji Hirao, Yuji Hisatomi, Hiroshi Ikeda
-
Patent number: 6220497Abstract: In method for soldering metal microstructured plates, stacks of plates and solder layers are prepared by placing the solder layers between each adjacent plate. The thickness of the solder layers range from 3 to 25 &mgr;m. The stack is then soldered by heating it in a vacuum or an inert atmosphere.Type: GrantFiled: January 19, 1999Date of Patent: April 24, 2001Assignee: Xcellsis GmbHInventors: Uwe Benz, Lothar Haug, Wolfgang Kleinekathoefer, Peter Waitkat
-
Patent number: 6213385Abstract: A method of manufacturing a clad product in which a metallic substrate material is extruded and a cladding material is then brought into intimate contact with the heated extrudate before the extrudate has had an opportunity to cool to room temperature. The cladding material is compressed against the heated extrudate, thereby bonding the cladding material to the substrate material and forming the clad extruded metallic product. The clad extruded metallic product is then cooled to room temperature.Type: GrantFiled: June 24, 1999Date of Patent: April 10, 2001Assignee: Brazeway, Inc.Inventors: Matthew M. Guzowski, Henry McCarbery
-
Patent number: 6199750Abstract: The top peaks of the outer fin are coated with slime-like flux. A sandwich unit is assembled from the outer fin and the tube plates by attaching the tube plates to the respective sides of the outer fin such that the surfaces of the tube plates having the butt bead faces formed thereon face inward. The butt bead faces on the respective tube plates on either side of the sandwich unit are coated with the slime-like flux. A plurality of sandwich units whose tube plates are coated with the flux are laminated and brazed, and the thus-formed assembly is heated in a heating furnace, to thereby braze together the tube plate pairs and the tube plates connected to the outer fin.Type: GrantFiled: July 28, 1999Date of Patent: March 13, 2001Assignee: Calsonic Kansei CorporationInventors: Makoto Kouno, Ryoji Matsunami, Tatsuya Fujiyoshi
-
Patent number: 6196442Abstract: There is disclosed a method for forming an aluminum tubular assembly in a controlled atmosphere brazing furnace. The assembly includes a variety of components of differing compositions, sizes and masses. Multiple, distinct brazing materials are used on the assembly to accommodate the differing components.Type: GrantFiled: May 18, 1998Date of Patent: March 6, 2001Assignee: Visteon Global Technologies, Inc.Inventors: Brett Walter Kalem, James Arnold Bush, Victor Carrillo
-
Patent number: 6193140Abstract: By the use of a heat exchanger tube not required for adhesion of Zn in advance and a fin not clad with a brazing composition, a heat exchanger core is provided which has corrosion resistance and brazing capability comparable to or higher than those of the conventional counterpart. Applied onto an outer surface of an extruded flattened tube as a heat exchanger tube is a brazing composition derived from a mixture of silicon and fluorine type flux, and a fin formed of an aluminum-based zinc-containing material is prepared. The extruded flattened tube and the fin are then heated at a given temperature so that the same are brought into brazed relation to each other, and a mixed diffusion layer of silicon and zinc is then on the outer surface of the extruded flattened tube.Type: GrantFiled: July 13, 1999Date of Patent: February 27, 2001Assignee: Alcan International LimitedInventors: Toshihiro Suzuki, Tsunehiko Tanaka, Meitoku Ogasawara, Yoshito Oki
-
Patent number: 6182746Abstract: In connection with a plate-type heat exchanger having several stacked, tub-shaped heat exchanger plates, each with a circumferential, beveled border, the borders of these heat exchanger plates being embodied to be curved and bent outward. This results in improved brazing of the heat exchanger plates with each other.Type: GrantFiled: November 16, 1998Date of Patent: February 6, 2001Assignee: Behr GmbH & Co.Inventor: Manfred Wiese
-
Patent number: 6170738Abstract: A first aluminum brazing alloy for cold brazing, comprises 70 to 90% by weight of zinc and 0.05 to 5% by weight of titanium with the balance consisting of aluminum and impurities. A second aluminum brazing alloy for cold brazing, comprises 30 to 70% by weight of zinc, 1 to 7% by weight of silicon, and 0.05 to 5% by weight of titanium with the balance consisting of aluminum and impurities. Brazing alloys having these compositions have a low melting point and can well wet a base metal. Further, use of the above aluminum brazing alloy for cold brazing enables a low-melting aluminum material to be well brazed at 400 to 550° C.Type: GrantFiled: June 26, 1997Date of Patent: January 9, 2001Assignee: Showa Aluminum CorporationInventors: Ryotatsu Otsuka, Koji Ashida
-
Patent number: 6161396Abstract: An ice making machine having an evaporator plate assembly which is manufactured from two side plates and a serpentine shaped tube. Each side plate has vertical partitions integrally formed therein. The two side plates are bonded to the serpentine shaped tube through a braze process.Type: GrantFiled: June 9, 1999Date of Patent: December 19, 2000Assignee: Scotsman Group, Inc.Inventors: Matthew Allison, Christopher Salatino
-
Patent number: 6149051Abstract: A method of brazing a Ti-15 Mo-3 Nb-3 Al-0.2 Si base material includes the steps of coating a braze material onto a base material. The braze material comprises substantially only a Ti--Cu--Ni--Zr mixture, with the mixture comprising about 40 wt % Ti. In particular, the braze material may comprise 40Ti-20 Cu-20 Ni-20 Zr. A following step includes heating the braze material and then forming a braze joint between the braze and base materials. The heating step can occur from about 760 to 932.degree. C. and over 15 to 90 minutes.Type: GrantFiled: July 21, 1998Date of Patent: November 21, 2000Assignee: AlliedSignal Inc.Inventors: John Vollmer, Matthew Pohlman
-
Patent number: 6129146Abstract: A heat exchanger is disclosed with one piece manifolds formed from a unitary sheet of metal. Each manifold has first and second sidewalls and a third sidewall extending therebetween the a lap joint between the side edges of the metal sheet. The first and second sidewalls are flat and the first is provided with tube apertures for receiving cooling tubes extending between a pair of manifolds. The second sidewall is flat and is provided with a socket for receiving the end of a pipe fitting in an interlocking connection. The manifold is clad on both sides with a brazing material and the manifold assembly with all attached parts are heated in a brazing oven to effect final assembly of the heat exchanger.Type: GrantFiled: May 17, 1999Date of Patent: October 10, 2000Inventors: David L. Krueger, Michael T. Putinta, Tom E. Rashley
-
Patent number: 6076727Abstract: A heat exchanger assembly includes at least one tube having an internal surface and an external surface, a composition cladding having at least lithium and magnesium applied to either one of the internal surface and external surface of the tube, and at least one component disposed adjacent the composition cladding, whereby the tube and component are joined together during a controlled atmosphere brazing process.Type: GrantFiled: May 13, 1998Date of Patent: June 20, 2000Assignee: Ford Motor CompanyInventors: Tim Van Evans, Matthew John Zaluzec, Gerald Adam Grab, Henry Mehraban, Ronald Paul Cooper, Walter Leon Winterbottom
-
Patent number: 6059174Abstract: A flux composition for brazing of an aluminum material which can feed a proper amount of flux to an area to be joined at the time of brazing and at the same time can improve working environment, and a method for brazing of an aluminum material. The method comprises: coating an aluminum material to be joined with a flux composition comprising 0.5 to 25 parts by weight of a polymeric compound having a number average molecular weight of 50000 to 5000000 and comprising repeating alkylene oxide units, 5 to 30 parts by weight of a fluoride flux, and water added in such an amount as will provide a total amount of the composition of 100 parts by weight; heating the coated area to remove water; heating the coated area to decompose and remove the polymeric compound; and then conducting heating for brazing.Type: GrantFiled: February 8, 1999Date of Patent: May 9, 2000Assignees: Showa Aluminum Corporation, Nippon Paint Co., Ltd.Inventors: Masahiro Kojima, Futoshi Watanabe, Atsuhiko Tounaka, Kiyotada Yasuhara, Hiroyuki Nojiri, Katsuyoshi Yamasoe
-
Patent number: 6036083Abstract: The forming oil degreasing step and flux coating step are reversed as part of a basic fluxed heat exchanger brazing process. This allows the fluxed parts to be thermally degreased concurrently with the braze oven workpiece preheat process, eliminating a separate degrease step and apparatus entirely. Surprisingly, and contrary to all teaching as to electrostatic dry power coating, powdered flux was found to electrostatically bond to an oily surface as well as, or even better than, an oil free surface.Type: GrantFiled: January 26, 1998Date of Patent: March 14, 2000Assignee: General Motors CorporationInventors: Yang Luo, Hartley F. Hutchins
-
Patent number: 6035927Abstract: A tube/fin block for a heat exchanger has several tubes through which a heat transfer fluid can flow arranged side-by-side along a transverse direction of the block. Corrugated-fin complexes are inserted between respective adjacent tubes and are connected with the adjacent tubes. At least one of the corrugated fin-complexes is a double corrugated-fin complex with two corrugated-fin units arranged side-by-side in the transverse direction of the block. A particular manufacturing process for the tube/fin block is utilized. A heat insulation device is provided between the two corrugated fin units. A non-solderable spacer plate can be inserted between the two corrugated fin units and pulled out after the tube/fin block is soldered together so that a heat-insulating gap is formed. A plastic strip can be inserted into the heat-insulating gap as required. The block is appropriate for use, for example, in condensers and evaporators of motor vehicle air conditioners.Type: GrantFiled: July 9, 1998Date of Patent: March 14, 2000Assignee: Behr GmbH & Co.Inventors: Hans-Joachim Krauss, Karl-Heinz Staffa
-
Patent number: 6026569Abstract: A heat exchanger and method of assembly for an automotive vehicle includes at least one tube having an internal surface and an external surface, and a composition cladding having at least magnesium applied to the internal surface and external surface of the tube.Type: GrantFiled: February 24, 1998Date of Patent: February 22, 2000Assignee: Ford Motor CompanyInventors: Tim V. Evans, Matthew J. Zaluzec, Gerry A. Grab, Henry Mehraban, Jeffrey S. Southwood
-
Patent number: 6012511Abstract: A plurality of tubes (3) for flowing a heat transfer tedium, a plurality of fins (4), and tanks (1) connected to the tubes (3) is provisionally assembled. Each of the tubes (3) comprises a pair of formed plates (3a, 3b) coupled to each other. Each of the formed plates (3a, 3b) has a peripheral portion (20) and a plurality of protrusions (14) formed on an inside thereof and having through-holes in top ends thereof. The outer surface of the provisional assembly is coated with a noncorrosive flux (40) in an amount rate of 3 g/m.sup.2 or more on the base of the total area of the outer surfaces and inner surfaces of the tanks, fins and tubes. Then, the provisional assembly is subjected to a brazing treatment. The noncorrosive flux (40) is melted and flows to penetrate into the inside of the tubes (3) through the through-holes (45, 18a) to bond the paired formed plates to each other.Type: GrantFiled: February 4, 1997Date of Patent: January 11, 2000Assignee: Sanden CorporationInventors: Toshiharu Shinmura, Kazuhiko Suto, Kiyohito Hosoi
-
Patent number: 5971258Abstract: The present invention provides a method of joining aluminum parts by brazing, comprising the steps of (a) providing a composite sheet having an aluminum core alloy material and a filler alloy cladding, applied to the core alloy material, the cladding including about filler alloy for brazing, which includes about 4 to 18 wt. % silicon, about 0.001 to 0.4 wt. % magnesium, about 0.01 to 0.3 wt. % lithium, not more than about 2 wt. % zinc, not more than about 1.25 wt. % manganese, not more than about 0.30 wt. % iron, not more than about 0.10 wt. % copper, not more than 0.15 wt. % impurities, balance aluminum; (b) contacting an aluminum part with the filler alloy cladding; and (c) brazing the aluminum part and the composite sheet to produce a brazed assembly.Type: GrantFiled: November 3, 1995Date of Patent: October 26, 1999Assignee: Kaiser Aluminum & Chemical CorporationInventors: Edgar G. Eichhorn, David L. Childree
-
Patent number: 5960864Abstract: A multi-tube heat exchanger includes a pair of tanks and a plurality of heat transfer tubes fluidly interconnected between the tanks, wherein each heat transfer tube has an engaging portion only at a first end portion engaging a wall of a first tank of the pair of tanks and a relatively movable portion at a second end portion capable of moving in an axial direction of the tube relative to a wall of the second tank. Such a structure helps ensure proper tube positioning and spacing while bowing or deformation of the heat transfer tubes is appropriately prevented at the time of heating and brazing.Type: GrantFiled: April 17, 1997Date of Patent: October 5, 1999Assignee: Sanden CorporationInventor: Tomonari Morita
-
Patent number: 5950713Abstract: In a heat exchanger having a plurality of tubes 2 alternately laminated with fins 3, header pipes 4 connected to and in communication with both ends of the laminated tubes, inlet and outlet connectors 8 connected to the header pipes to supply and receive a heat exchanging medium to and from an external equipment, and the heat exchanging medium meanders a plurality of times between the inlet and outlet connectors; a groove 15 is formed in one of the inlet and outlet connectors 8, on the rim of the piping connecting face of the connector having its piping connecting face 11 facing downward with respect to the vertical line during brazing, so as to prevent the flux from entering into the inside of the piping connecting face from the outside of the piping connecting face.Type: GrantFiled: November 13, 1997Date of Patent: September 14, 1999Assignee: Zexel CorporationInventor: Soichi Kato
-
Patent number: 5947365Abstract: A process for producing a flat heat exchange tube having opposed upper and lower walls and a plurality of reinforcing walls connected by brazing between the respective upper and lower walls for dividing the tube interior into parallel fluid passages. In order to strengthen the brazed connection between the reinforcing walls and the lower surface of the upper wall and to prevent the creation of a clearance space therebetween, the lower surface of the upper wall is provided in advance with longitudinally extending ridges with which the upper surfaces of the reinforcing walls come in contact to eliminate the clearances and thus insure the existence of a continuous brazed connection between each reinforcing wall and lower surface of the upper wall.Type: GrantFiled: June 25, 1997Date of Patent: September 7, 1999Assignee: Showa Aluminum CorporationInventors: Daishi Tanaka, Masakazu Furuta, Kazuyuki Takahashi, Yasuhiro Osame
-
Patent number: 5893412Abstract: In order to prevent a communicating pipe from becoming damaged by water (in particular drain water) collecting in the gap formed between the tube element at one end of a heat exchanger that is constituted of a flat plate and a formed plate and the communicating pipe through defective brazing and repeatedly freezing and melting, a flange (32) and a bonding margin (11) continuous to the flange (32) are notched off over almost the entire circumference at the center on the inside of an indented portion (9) in a formed plate (16) which, together with a flat plate (15), constitutes a tube element (3b). Thus, while the communicating pipe (27) comes in contact with the internal surface of a flange (29) of a pipe connection hole (28) of the flat plate (15), it does not come in contact with the formed plate (16), thereby forming a gap bounded by the flat plate (15), the formed plate (16) and the communicating pipe (27).Type: GrantFiled: March 24, 1998Date of Patent: April 13, 1999Assignee: Zexel CorporationInventors: Kunihiko Nishishita, Seiji Inoue, Fumio Ohkubo
-
Patent number: 5868196Abstract: A mounting bracket for a heat exchanger is connected to a heat exchanger body by brazing. The bracket has a first surface connected to the heat exchanger body, a second surface connected to an external member and a pin projecting from the second surface for positioning the bracket relative to the external member. A hole is formed in the first surface of the bracket and this hole is in communication with a bracket portion securing the pin to enable a brazing material to flow from the first surface to the pin securing bracket portion through the hole. The separation between the first and second surfaces is reduced, and the overall size of the bracket is reduced. By the reduction of the size of the bracket, the space required for installation of the heat exchanger may be reduced, or the area of the core portion of the heat exchanger body may be increased even in a limited space.Type: GrantFiled: January 12, 1998Date of Patent: February 9, 1999Assignee: Sanden CorporationInventor: Hiroshi Tanaka
-
Patent number: 5839646Abstract: A process for manufacturing hard-soldered aluminum heat exchangers is provided. For heat exchangers which are provided with flat tubes of a narrow interior with, known soldering processing operating with a fluxing agent cannot be used or can only be used with extreme difficulty. For such flat tubes, and optionally for turbulence inserts which can be slid into such flat tubes, certain materials and coatings are provided which result in a soldered connection in the tube interior where, according to the new process, no fluxing agent is used.Type: GrantFiled: December 23, 1996Date of Patent: November 24, 1998Assignee: Behr GmbH & Co.Inventors: Bernd Duda, Klaus Lorenz, Cord Voelker
-
Patent number: 5823247Abstract: A heat exchanger device and method of making same disclosed has a heat exchanger core and a stack of inner plates with alternating hot and cold flow fluid passages producing diagonal flow therethrough. One embodiment adds a pair of core retaining plates with end portions extending beyond the core with apertures at precise locations to connect with connectors of equipment to which it is coupled and the other embodiment has end connectors that weld to the core to provide straight in line fluid flow.Type: GrantFiled: August 16, 1996Date of Patent: October 20, 1998Inventor: Walter W. Weibler
-
Patent number: 5816316Abstract: A tubular heat exchanger for a motor vehicle has a header comprising a header plate and a header cover brazed to the header plate. The header plate has a base portion which is arranged to be joined to the bundle of tubes of the heat exchanger, and the header cover is terminated by a peripheral edge portion which is engaged within a peripheral flange of the header cover surrounding the base portion of the latter. This base portion is provided with a multiplicity of press-formed projecting elements which are spaced apart close to the peripheral flange, and the peripheral edge portion of the header cover is held in contact with the header plate flange by these projecting elements prior to the brazing operation by which the edge portion of the cover is brazed to the header plate flange.Type: GrantFiled: February 19, 1997Date of Patent: October 6, 1998Assignee: Valeo Thermique MoteurInventor: Jacques Hoffnung
-
Patent number: 5806752Abstract: An open-air brazing method for manufacturing an assembly including at least one aluminum based tube having an internal surface and an external surface, applying an Aluminum Association 4XXX aluminum based filler material to at least a portion of the external surface of the tube, disposing at least one aluminum based component adjacent the filler material, and applying a modified aluminum brazing flux to a joint between the at least one tube and the at least one component to form a precursor assembly, said brazing flux comprising cesium fluoride, lithium fluoride, or their mixture added into a potassium fluoaluminate flux in an amount of at least about 1% by weight of the modified flux. The method further comprises joining the at least one tube and at least one component together in an open-air brazing furnace whereby the temperature is raised from about 450.degree. C. to about 600.degree. C. in about 15 to 20 seconds.Type: GrantFiled: December 4, 1996Date of Patent: September 15, 1998Assignee: Ford Global Technologies, Inc.Inventors: Timothy Van Evans, Gerry A. Grab, Nathan Victor Carter, Matthew John Zaluzec
-
Patent number: 5796189Abstract: A method of creating a brazed joint between a plurality of solid and hollow strands of a stator bar and a stator bar end fitting comprising the steps of:a) inserting between free ends of the plurality of solid and hollow strands a preformed braze alloy such that the braze alloy is at least flush with the free ends of the hollow and solid strands;b) applying stop off material to free end edges of at least the hollow strands;c) inserting the solid and hollow strands and preformed braze alloy in an opening of a stator bar end fitting;d) heating the braze alloy to cause the braze alloy to flow about and between the solid and hollow strands and between the fitting and the solid and hollow strands, but wherein the stop off material prevents flow of braze alloy onto the free end edges of the hollow strands.Type: GrantFiled: January 23, 1996Date of Patent: August 18, 1998Assignee: General Electric Co.Inventors: Michael Patrick Manning, Robert Timothy Lembke
-
Patent number: 5782291Abstract: The present invention is directed to a heat exchanger. The heat exchanger comprises a pair of header tanks and a plurality of pipe members connecting the pair of header tanks in fluid communication. Each of the pipe member includes a pair of fin portions which diametrically project from an outer peripheral surface thereof. The fin portion extends along the longitudinal axis of the pipe member. The pipe member further includes a pair of limiting elements which are formed at a top and bottom end portions of the pipe member, respectively. One of the pair of limiting elements limits an insertion of the top end portion of the pipe member into a bottom portion of the upper header tank, so that no boundary contact line is created between the top end of the fin portions and the lower surface of the bottom portion of the upper header tank.Type: GrantFiled: May 30, 1996Date of Patent: July 21, 1998Assignee: Sanden CorporationInventor: Tomonari Morita
-
Patent number: RE36960Abstract: A convection muffle furnace for brazing and/or annealing a workpiece includes a muffle having towers formed integrally therewith and being mounted movable relative to a top wall of a furnace. Circulation fans are mounted in the towers so as to move along with the muffle during its expansion and contraction for producing forced convection heat transfer.Type: GrantFiled: January 20, 1999Date of Patent: November 21, 2000Assignee: Seco/Warwick CorporationInventors: Jeffrey W. Boswell, Michael A. Schmidt