Abstract: A tube support structure for heat transfer tubes in a steam generator has a plurality of tube support bars which are installed between the heat transfer tubes. At least one of the support bars has a first metal layer and a second metal layer. The first metal layer is preferably spot welded to the second metal layer at intervals. The first metal layer and second metal layer have different thermal expansion coefficients so that at room temperature the support bar is flat, and at the operating temperature of the steam generator the first layer forms a convex shape between the intervals to support the adjacent tube.

Abstract: The invention relates to a multi-chamber tube, produced from a flat sheet, welded along the longitudinal surfaces with two planar face surfaces, two curved narrow sides and webs, folded from the flat strip which divide adjacent chambers and which are soldered to the opposing tube inner wall and a method for production thereof. According to the invention, the flat strip comprises inward projections in the region of the soldering of the webs.

Abstract: A metal plate comprises two flat wall forming portions 89, 90 connected together by a joint portion 88, a plurality of reinforcing wall forming portions 83, 84 upwardly projecting from each of the wall forming portions 89, 90 integrally therewith, and a side wall forming portion 81, 82 formed at each of opposite side edges of the plate and upwardly projecting therefrom integrally therewith. A projection 85 is formed on the upper end of the reinforcing wall forming portion 83 on the flat wall portion 89, and a recess 86 for the projection 85 to fit in is formed in the upper end of the wall forming portion 84 to be butted against the portion 83 and provided on the other flat wall portion 90. The metal plate satisfies the relationships of: A>a, A/a?1.5, B/b?1.5, C/c?1.5, and D/d/?1.

Abstract: A method for fabricating a supporting column of a heat sink is disclosed. A substrate having a concave portion, and a material injection board having a through hole are prepared first. The material injection board is then mounted on the concave portion of the substrate with the through hole of the material injection board being located at a position of the substrate where a supporting column is to be formed. Aggregate is injected into the through hole, and then the substrate, the material injection board and the aggregate are disposed under a high-temperature environment for sintering. After the aggregate is formalized, the material injection board is removed from the substrate so as to obtain a substrate having a supporting column formed on the concave portion. Since the supporting column fabricated according to the above method has improved capillary structure and density, the heat sink has an improved heat dissipating efficiency.

Abstract: A method for creating lengthwise extending lengths of pipe having an undulating or helical configuration symmetrically formed about a centerline of the pipe includes the steps of heating a sheet of material, feeding the sheet progressively to a succession of stamping stations at which an undulating shape is progressively imparted to the material until at the final station the desired final configuration is achieved in a lengthwise extending half section of the finished pipe, and securing one half section of pipe to another half section of pipe along lengthwise extending edges thereof to form the finished pipe. The undulating pipe of helical configuration finds particular use in the formation of pipelines intended to convey slurries of material such as bituminous material mined from oilsands. Apparatus for carrying out the method is also provided.

Abstract: In some preferred embodiments, an extrusion die for metallic material capable of obtaining a high quality extruded article can be provide while securing sufficient strength and durability. The extrusion die is provided with a die holding case 20 having a dome portion 21 with an external surface functioning as a metallic material pressure receiving surface 22, the metallic material pressure receiving surface 22 being disposed so as to face rearward, a male die 30 held in the die holding case 21, and a female die 40 held in a front portion of the die holding case 20. The metallic material pressure receiving surface 22 is formed into a convex configuration, and a porthole 24 is formed in the dome portion 21. The central axis A2 of the porthole 24 is inclined to the central axis A1 of the die holding case 20. The metallic material pressed against the metallic material pressure receiving surface 22 is introduced into the die holding case 20 through the porthole 24 and passes through the extrusion hole 11.

Abstract: A heat exchanger tube includes a tube body that forms a hollow passageway and has a U-shaped tube section defining a return bend and a pair of straight tube sections. Respective ones of the straight tube sections are connected to the U-shaped section at respective connection locations and extend generally parallel to one another to define an internal space disposed between and among the U-shaped tube section and the straight tube sections connected to the U-shaped tube section. The U-shaped tube section has a concavity formed thereinto with the concavity defining a portion of the internal space. A heat exchanger serpentine tube includes a plurality of straight tube sections arranged in a plurality of generally parallel rows and disposed in a common plane and a plurality of U-shaped tube sections connected to the plurality of straight tube sections to form a serpentine configuration.

Abstract: A heat exchanger for cooling exhaust gas, around which a liquid cooling medium flows on the outside, including a bundle of rectangular tubes provided as ducts for the exhaust gas whose ends are welded into tube bottoms. The bundle of rectangular tubes is surrounded with a sheet metal jacket which follows the contour of the bundle and which is provided with a cooling medium inlet and a cooling medium outlet. The ends of the sheet metal jacket are provided with welded-on flange plates which are each open by means of a central opening with respect to the bundle of rectangular tubes and which are provided with fastening devices for fastening onto pipe sections of an exhaust pipe.

Abstract: In a method of forming a needle for an auto-sampler successively collecting liquid samples from plural sample containers, a parent material forming the needle is coated with a coating material having a chemical activity small than that of the needle. Then, the coated parent material is polished so that the surface has an average roughness of 10 to 20 nm.

Abstract: A heat transfer tube for a heat exchanger and a method of manufacturing such a tube. The heat transfer tube includes opposing top and bottom walls and end walls connecting the top and bottom walls to each other. The top and bottom walls each define a substantially planar surface and the end walls each define a generally curved surface. The end walls each including deformations formed therein to strengthen the heat transfer tube.

Abstract: A tube 101 is constituted by a pair of plates 111a, 111b which are fitted with each other in such a manner as to put an inner fin 101b between the plate 111a and the plate 111b. Differences in level 111c are formed on the second plate 111b, which fits inside, which differences in level each protrude inwardly by a distance equal to the thickness of the first plate 111a, whereby the outer wall surface of the tube 101 is made substantially level thereover. A gap which is formed between the outer wall surface of the tube 101 and a core plate, when the tube is passed through the core plate, can be as small as possible whereby the brazing properties can be improved.

Abstract: A heat shield comprises a convoluted tube preferably formed from two layers of aluminum. The convoluted tube may have an inside minor diameter ranging from 0.5 inches to 3.0 inches and preferably includes convolutions of greater than 0.070 inches and a pitch of at least 0.787 inches. Optionally, the tube is coated with a dark colored or black material to further enhance the heat shielding and dispersing properties. The present invention also includes a method of manufacturing the convoluted tube, and a method of shielding heat from an automobile EGR utilizing an aluminum convoluted tube having convolutions of at least 0.070 inches.

Abstract: A fabricated, B type heat exchanger tube is folded with a distinctive internal enclosed seam of substantially triangular cross section, with an enlarged cross sectional area and longer, sharper corners. The uniquely shaped internal seam prevents liquid braze material from bridging and filling the cross sectional area of the seam, and thereby causes a lengthwise, erosive flow of braze material to move along the internal seam, rather than along the external seam.

Abstract: In a tube (4) for a heat exchanger comprising a flat pipe (16) whose both ends are opened and in which a flow path (15) for a heat exchanging medium is formed, and an inner fin (17) arranged in the flow path (15), wherein said flat pipe (16) is constituted of a sheet of material for a flat pipe, the inner fin is constituted of two opposing flat plate portions (17b, 17c) connected along one of side edges of said flat pipe (16) and formed in a flat plate shape so as to be in contact with an inner surface of the said flat pipe (16), and projection portions (17d) which are projected from at least one of the flat plate portions (17b, 17c) and whose tops are in contact with the other opposing flat plate portion (17b, 17c). It is preferred that the projection portions (17d) are projected from both of the flat plate portions (17b, 17c) toward the opposing flat plate portion, and the opposing tops are made come in contact with each other.

Abstract: A method is provided for successfully rolling co-extruded tubing into drums of a boiler bank. First, a co-extruded tube is provided, containing a carbon steel base tubing with an outer layer of high alloy tubing. Next, the outer layer of high alloy tubing is removed by machining in the area of the co-extruded tubing that is to be rolled into the drum. Then, the co-extruded tubing is swaged using multiple swaging steps and annealing treatments. The co-extruded tubing is swaged to the required diameter and wall thickness. Finally, co-extruded tubing is inserted, rolled, and sealed into the drums.

Abstract: A first plate and a second plate have brazing paste on the surface thereof. When the first plate is combined with the second plate while an inner fin is disposed therein, a protrusion forms a clearance there between. Heat is added to evaporate the organic substances in the brazing paste. The organic substances vapor is discharged into outside of the tube through the clearance. After that, heat is added furthermore to melt the brazing paste. The first plate and the second plate are brazed together to form the tube and the inner fin is brazed to the inside of the tube.

Abstract: An inlet pipe 6 and an outlet pipe 7 for a condenser are made from an alloy containing 0.9 to 1.5 mass % of Mn, and the balance Al and inevitable impurities. Each of the inlet pipe 6 and the outlet pipe 7 contains Zn diffused through a surface layer portion thereof from the outermost surface of outer periphery of the pipe to a depth of at least 60 fÊm, and the surface layer portion has a Zn concentration of 0.20 to 0.70 mass %. The pipes 6 and 7 can be produced easily at a low cost and have satisfactory resistance to pitting corrosion.

Abstract: Disclosed is a tube made of a profile rolled metal product, in particular for use in heat exchangers, a rolled metal product and a method of producing the same. The tube includes a first wall and a second wall forming two opposing sides of the tube, and a plurality of reinforcing structures connecting the first and second walls and forming longitudinal passages between them. Each reinforcing structure is formed by a longitudinal ridge on the first wall projecting towards the second wall and a longitudinal ridge on the second wall protecting towards the first wall. The ridges are joined to each other at their sides.

Abstract: A heat exchanger includes at least one tube provided with an inner fin in a fluid passage which is defined by the tube therein and has a substantially ellipse-shaped cross section. A plate member for constructing the tube has two edge portions, which overlap each other and are integrally joined at a single joint disposed at a major-axis direction end of the tube. The inner fin is arranged in the tube before the forming of the joint, thus improving an arrangement performance of the inner fin. Moreover, there exists the single joint positioned at the one end of the tube so that a joint reliability of the tube is enhanced.

Abstract: In a tube (4) for a heat exchanger comprising a flat pipe (16) whose both ends are opened and in which a flow path (15) for a heat exchanging medium is formed, and an inner fin (17) arranged in the flow path (15), wherein said flat pipe (16) is constituted of a sheet of material for a flat pipe, the inner fin is constituted of two opposing flat plate portions (17b, 17c) connected along one of side edges of said flat pipe (16) and formed in a flat plate shape so as to be in contact with an inner surface of the said flat pipe (16), and projection portions (17d) which are projected from at least one of the flat plate portions (17b, 17c) and whose tops are in contact with the other opposing flat plate portion (17b, 17c). It is preferred that the projection portions (17d) are projected from both of the flat plate portions (17b, 17c) toward the opposing flat plate portion, and the opposing tops are made come in contact with each other.

Abstract: A method of manufacturing an elongate fluid conveying tube that includes starting from a blank of metal material, wherein the fluid conveying tube is adapted to be mounted in a vehicle cooler and comprises at least two internal elongate ducts. The method of manufacturing the tube includes forming a projecting surface structure on a portion of the surface of the blank. The method also includes defining a substantially flat web portion between two upright edge portions that are formed along two opposite edges of the blank. Additionally, the method involves forming the ducts such that the edge portions are situated perpendicular to the web portion and the outer faces of said edge portions are brought into abutment against each other and against the web portion for defining said ducts.

Abstract: A heat exchanger for cooling exhaust gas, around which liquid cooling medium flows on the outside, including a bundle of rectangular tubes provided as ducts for the exhaust gas whose ends are welded into tube bottoms. The bundle of rectangular tubes is surrounded with a sheet metal jacket which follows the contour of the bundle and which is provided with a cooling medium inlet and a cooling medium outlet. The ends of the sheet metal jacket are provided with welded-on flange plates which are each open by means of a central opening with respect to the bundle of rectangular tubes and which are provided with fastening devices for fastening onto pipe sections of an exhaust pipe.

Abstract: A wrought aluminum sheet product having a textured surface for improved heat transfer properties. A plurality of textured features having dimensions of about 1-50 microns is roll textured onto one or both sides of the sheet. The aluminum sheet may be used as the fins or tubing of a heat exchanger.

Abstract: In a method of manufacturing a tube that has a plurality of projections (dimples) protruding inwardly from an inside wall of the tube other than a longitudinal end, a work, which is a material of the tube and in a form of band plate, is shaped by a roller to form projections while the work is continuously fed. Then, the projections formed at a predetermined portion of the work are crushed so that the predetermined portion of the work is flattened. Therefore, the projections are formed continuously while the work is continuously fed. It is possible to deal with variations of length of the tube without exchanging a projection-forming roller, thereby improving productivity.

Abstract: Disclosed is a heat exchanger, in particular for motor vehicles, having a large number of flat tubes which contain indentations (“winglets”) and through which a fluid cooling medium can flow, and having corrugated fins which are associated with these flat tubes and to which environmental air or other media can be applied. In addition, there is disclosed a method for producing flat tubes of this type (“winglet tubes”) and for assembling these flat tubes into heat exchangers.

Abstract: A method of forming inner flanges in a bushing comprises steps of (a) extruding a bushing into an extruding die, (b) cutting an initial upward flange in the bushing, (c) shaping the initial upward flange into a final inner flange, and (d) repeating steps (a) to (c) to form additional inner flanges.

Abstract: In a method of manufacturing a tube that has a plurality of projections (dimples) protruding inwardly from an inside wall of the tube other than a longitudinal end, a work, which is a material of the tube and in a form of band plate, is shaped by a roller to form projections while the work is continuously fed. Then, the projections formed at a predetermined portion of the work are crushed so that the predetermined portion of the work is flattened. Therefore, the projections are formed continuously while the work is continuously fed. It is possible to deal with variations of length of the tube without exchanging a projection-forming roller, thereby improving productivity.

Abstract: A compact fuel processing reactor. The reactor includes a housing having an inlet for receiving a process gas and an outlet for a directing a product gas out of the housing. A catalyst bed that includes discrete particles of a refractory material is located within the housing for contacting the process gas. A coiled tubing heat exchanger is at least partially disposed within the catalyst bed for cooling the catalyst bed. The coiled tubing can comprise a smooth continuous outer surface in intimate contact with the discrete particles. The circulating cooling medium comprises water in liquid, gas or a mixture of liquid and gas phases. The discrete particles in the catalyst bed are in intimate contact with at least a portion of the coiled tubing to promote heat transfer from the catalyst bed to the coiled tubing.

Abstract: A tube for a heat exchanger which has beads (21) formed on a brazing sheet (B) for configuring a tube (2) and tops of the beads brazed with opposed portions within a tube part (20) and a method for manufacturing the tube. The tube part (20) prior to brazing is determined to have a thickness (t′) larger than a predetermined thickness (t) and compressed in a direction of its thickness when it is brazed, and the tube which has tops of the beads crushed against or lodged in opposed portions within the tube part. Also a method for manufacturing the tube which can braze the tops of the beads with the opposed portions within the tube more securely and firmly than before.

Abstract: A method for producing longitudinally welded helically corrugated metal tubing, wherein a metal strip pulled from a strip supply is formed into tubing with a longitudinal slit, the longitudinal slit is sealed by welding and the corrugation is produced by a corrugation tool that is supported eccentrically and at an angle to the tubing axis, is freely rotatable in a rotationally driven corrugator head, and rolls off the surface of the tubing. The metal strip as well as the uncorrugated metal tubing are advanced by a feed device that is provided between the welding point and the corrugation unit. A second feed device (8) engages the corrugated tubing (7) directly behind the corrugation unit (6), and the feed rate of the second feed device is slower than the forward feed rate of the corrugated tubing (7) which results from the pitch of the corrugator disk and the rotational speed of the corrugator head.

Abstract: An apparatus and method of forming serpentine heat exchanger coils from spine fin tubing involves applying spine fins to a tube while simultaneously forming the tube into a serpentine shape. The bending and fin wrapping occurs while a feed roll continues paying out the tube without interruption. Multiple bends can be made simultaneously.

Abstract: The invention relates to a method for forming at least one flat-tube insertion slot in a header tube. A sawcut is introduced into the header tube during a sawing step, and the slot is configured, during a subsequent punching step, by means of a slot punch, which punches into the region of the sawcut. A rimmed opening can be configured during the punching step by using a slot punch with a larger width and/or length relative to the sawcut. The sawcut is preferably introduced to a depth less that the wall thickness of the header tube. The respective web region(s) between chamber of a multi-chamber header tube can be compressed during the punching operation to a level lower than that of a header-tube wall region functioning as a flat-tube insertion stop, in order to form a chamber-connecting duct.

Abstract: A machine may produce a tube having textured internal and external surfaces in a single operation. Inner and outer knurling tools may form the textured surfaces. The texturing of the internal and external surfaces may be helical patterns of ribs and grooves. The height of the ribs formed in the internal and external surfaces may be less than about 35 mils. The angles of the patterns relative to a longitudinal axis of the tube may be less than about 45°. The angle of the helical pattern allows textured tubes to be used as heat exchanger elements wherein flow is directed substantially coaxial to the longitudinal axes of the tubes. The helical pattern formed in the external surface may be oriented in a right hand or left hand helical orientation. Similarly, the helical pattern formed in the internal surface may be oriented in a right hand or left hand orientation.

Abstract: A heat exchange tube includes a tubular conduit for flowing a working fluid therethrough and for conducting heat between the working fluid and a thermal field proximate the tube, and a wire extending axially through the tubular conduit and spaced from an inside surface of the tubular conduit. The invention also provides a method for increasing heat transfer about a tubular conduit by positioning a wire in the conduit.

Abstract: A method of providing volume production of highly pressure resistant headers (10), (12) is provided and allows the headers (10), (12) to be formed of a header structure (10), (12) with a relatively thin wall portion (32) and a relatively thick wall portion (30). A strip (40) is utilized to provide the desired thickness at the thin wall portion (32) while allowing both the thin wall portion (32) and the strip (40) to have tube slots (34), (42) formed therein by a one step punching operation.

Abstract: A wrought aluminum sheet product having a textured surface for improved heat transfer properties. A plurality of textured features having dimensions of about 1-50 microns is roll textured onto one or both sides of the sheet. The aluminum sheet may be used as the fins or tubing of a heat exchanger.

Abstract: An apparatus and method of forming serpentine heat exchanger coils from spine fin tubing involves applying spine fins to a tube while simultaneously forming the tube into a serpentine shape. The bending and fin wrapping occurs while a feed roll continues paying out the tube without interruption. Multiple bends can be made simultaneously.

Abstract: A process for making a multilayer plastic tube heat exchanger with a ribbon of molten polymer being poured over layers of tubes, and then another layer of tubes being added and another ribbon of polymer. Heat exchanger structures so formed are also disclosed.

Abstract: A flat, heat exchanger tube formed by rolling metal strip to fold inwardly the lateral edge regions of the strip to provide a tube having parallel, spaced, generally planar upper and lower walls, one of said lateral edge regions being bent to define a longitudinally extending partition wall extending within the tube towards said lower wall, said partition wall including first and second longitudinally extending regions disposed at an angle to one another so as to provide in one face of the partition wall a longitudinally extending recess receiving the free edge portion of the other of said lateral edge regions of the strip.

Abstract: In a method of making an exhaust gas collector, a collector housing is made from a tubular blank, and subsequently, an inlet duct is formed through a widening process to provide a substantially rectangular cross section with rounded narrow sides. The inlet duct is provided with a head flange. At the outlet side, the collector housing is necked by a press-forming process so as to shape an outlet duct having a substantially circular cross section which is reduced in size compared to the cross section of the collector housing. Attached to the outlet duct is an end flange.

Abstract: In a bumper bar for vehicles, the bar is extended in one dimension, has a closed cross-section and two ends and includes at least one front flange, one rear flange, one top side and one bottom side. The bumper bar has at least one part of the rear flange, lying along the bar, in contact with at least one part of the front flange, also lying along the bar. In the method for manufacturing the bumper bar, the at least one part of the rear flange is wholly or partially pressed in towards the at least one part of the front flange.

Abstract: A flat tube block heat exchanger with a plurality of flat tubes with deformed ends. The deformed ends have broad sides that have been deformed to expose the inner surface of the flat tubes. The exposed inner surfaces of the flat tubes are bonded to the exposed inner surface of an adjacent flat tube. The bonded inner surfaces of the adjacent flat tubes form a fluid barrier with tanks located at opposite ends of the flat tubes.

Abstract: A heat exchanger is comprising a core which is consisting of tubes provided with medium passages and fins fitted to the tubes, and tanks to which ends of the tubes are connected, wherein the tube (2) is formed to have a flat cross-sectional shape by joining ends of one or two plates, the ends of the plates have a contact portion which is formed by bending at least one of the plate ends a plurality of times and overlaying the one end on the other end, and the contact portion is provided with a joint portion (2c) which is formed by placing a part (2e) of the contact portion on the top or bottom flat surface and mutually engaging the both ends of the plate.

Abstract: A method for manufacturing a heat transfer member comprises the steps of: subjecting elongated materials to be worked, which are made of metallic thin sheets, to a continuous press forming utilizing a plurality of press-forming devices to form heat transfer faces each having a prescribed shape, while transferring the materials in a prescribed feeding direction, which is in parallel with a longitudinal direction of the materials; and welding two materials, which have been subjected to the press forming, of the elongated materials together utilizing a welding device to form a heat transfer member having substantially a tubular shape.

Abstract: A heat exchanger tube of the present invention has first and second surfaces with a longitudinal length and a lateral width. At least one of the surfaces has a plurality of striae that extend along a portion of the width of the tube. The tube has at least one passageway that allows a fluid to flow therethrough. The striae minimize and/or prevent unwanted flow of molten braze alloy along die-lines in the tube formed as part of the extruding process. The striae can be formed in the tube by rollers having projections that extend radially outward. The projections form the striae in the tube as the tube passes along the outer surface of the roller. The striae can be advantageously formed in the tube as part of the overall extruding process or subsequent to the extruding of the tube during the sizing process.

Abstract: An economically formed tube of rectangular or oval-like cross section and with a corrugated internal fin includes spaced, relatively long side wall sections joined at their ends by relatively short end wall sections. An integral fin within the tube has crests and valleys defining a plurality of flow paths within the tube and is formed of a corrugated section of a strip employed to form one of the side walls and at least part of both of the end walls.

Abstract: A folded multi-passageway flat tube is disclosed, which is made from a flat sheet metal strip and has folded webs and a longitudinal seam. Through-openings for improving the heat transfer and for generating transverse flow are provided in the folded webs. The through-openings are advantageously made by punching in the flat sheet metal strip, that is to say before folding, and are made congruent after folding. These folded multi-passageway flat tubes are preferably used for refrigerant condensers in motor vehicle air-conditioning systems.

Abstract: An improved method for producing a basic B tube configuration for a folded heat exchanger tube (26). A braze clad metal strip (10) having inner (1) and outer (0) surfaces and a opposed edges (12) is progressively formed over and in by a series of progressive roller stations (14A, 16A-14J, 16J) until the lower edges (12) on a pair of central abutting flanges 18 centrally engage the strip inner surface (1). Between two of the roller stations (G and H), a powered dispense valve (20) with nozzle (22) continuously dispenses a bead (24) of material containing flux or, alternatively, flux and braze material. Bead (24), rather than being a thin stripe, is a thick semi cylindrical shape, with substantial viscosity. As the flanges (18) move into abutment and the downstream roller stations, the flange edges (12) are forced down into the bead (24), some of which is pumped up between the outer surfaces (0) of the abutted flanges (18), yielding a good, solid braze joint between the two.

Abstract: The invention relates to a method of fabricating a pyrometallurgical reactor cooling element with flow channels. In order to enhance heat transfer capability, the wall surface area of the flow channel, which is traditionally round in cross-section, is increased without increasing the diameter or length of the channel.

Abstract: A tube and method of making the same for a heat exchanger includes a base, a top spaced from and opposing the base, a first side interposed between the base and the top along one side thereof, and a second side interposed between the base and the top along another side thereof. The tube includes an end form formed solely on either one of the first side and the second side to create a stop for inserting said tube into a manifold of the heat exchanger.