Abstract: A heat exchanger, especially a heating or cooling radiator for a motor vehicle, has a tube bundle consisting of oval or oblong tubes which extend through a matrix of cooling fins. End portions of the tubes are introduced into holes in a header plate, with a compressible sealing gasket being interposed, the gasket having collar portions surrounding the tube end portions, and the latter having an oval or oblong cross section. The major axis of each tube end is equal to the major axis of the body of the tube, while the minor axis of the tube end is greater than the minor axis of the body of the tube as a result of the tube having been expanded or flared during the assembly of the heat exchanger.

Abstract: A header of a heat exchanger includes a seat member having bent portions on its end portions, a tank member having side walls on its end portions, and a pair of caps sealing the open ends of a barrel formed from the seat member and the tank member. Each side wall has a free end portion bent inwardly by an amount substantially equal to a thickness of the bent portion. The inner surface of each bent portion and the outer surface of each offset free end portion are joined to form the barrel. Thus, protrusions on the exterior shape of the formed barrel are eliminated, thereby eliminating contours from the shape of each cap provided on each open end of the barrel.

Abstract: A heat exchanger (10) having a pair of spatially separated manifolds (12 and 14) interconnected by a plurality of transverse tubes (16). The ends of the tubes are attached to a plurality of manifold inserts (20) slidably received in the manifolds. The lengths of the individual manifold inserts may be controlled to adjust the pitch and the number of the transverse tubes. The heat exchanger configuration is ideally suited for fabricating low production runs and prototype heat exchangers.

Abstract: A fluid heater includes a housing, a burner unit disposed in a bottom portion of the housing for burning combustible fuel, a combustion chamber disposed within the housing where the fuel is burned and a heat exchanger disposed substantially within the housing over the combustion chamber. The heat exchanger absorbs heat generated from burning the fuel and conducts the heat to a fluid to be heated. The heat exchanger includes a pair of spaced, parallel, stainless steel tubesheets with a plurality of tubes running therebetween and sealingly received within mating apertures in each of the tubesheets. A plastic front header and a plastic rear header are removably attached to the tubesheets distal to said tubes. The apertures in the tubesheets preferably have forged flanges for increasing the surface contact area with the heat exchanger tubes. The heat exchanger is corrosion resistant due to the combination of corrosion-resistant tubesheets, tubes and headers.

Abstract: To provide a heat exchanger capable of installing the side plate to the header pipe accurately without improper joining and errors respectively is disclosed. In a heat exchanger in which both end portions of the side plate are inserted into end portions of a pair of header pipes respectively, a large number of tubes are provided between the header pipes between the side plates, and fins are provided between the large number of tubes, a pair of pawls for pinching the header pipe wall therebetween are provided on both sides of both end portions of the side plates respectively so that the pair of pawls regulate the angle of installation and the insertion position of the side plate to the header pipe. This enables the side plate to be accurately installed to the header pipes in a state free from improper joining and errors, and the header pipes are accurately positioned, thus eliminating any possibility of causing obstruction to piping or the like.

Abstract: In a heat exchanger according to the present invention, a projecting edge portion integrally projects outward from an opening edge portion of a tank body, and a tank and a core plate are connected to each other in such a way that a claw portion of an edge portion of the core plate is caulked by being folded toward a back of the projecting edge portion, and the back of the projecting edge portion at the opening edge portion of the tank body and an outside surface of the tank body are continuously connected to each other by a curved surface. Accordingly, stress dispersedly acts on the connection portion between the tank and the core plate so that local stress concentration is prevented and breakage is prevented.

Abstract: A heat exchanger (10) assembly with a first header (12), a second header (14), a plurality of seamed or folded type heat exchanger tubes (18) extending between the two headers (12, 14), and a plurality of heat exchanger fins (16). Each of the plurality of fins (16) has between 0.01% and 0.9% magnesium to improve the braze between the header (12, 14) and tube joint and the tube seam to inner surface joint (140). Additionally, the headers (12, 14) have a cladded inner surface with between about 0% to about 12.6% silicon to improve the braze at the tube-to-header joint.

Abstract: What is disclosed herein deals with low to medium pressure, high temperature, all ceramic, air-to-air, indirect heat exchangers, novel ball joints; connecting slip ring collars for ceramic tubes, that are useful in such heat exchangers, systems comprising several heat exchangers or systems comprising heat exchangers that are fabricated such that they provide more efficient heat exchangers than has been possible heretofore.

Abstract: An improved end tank-to-header joint is disclosed. An end tank is formed with a flange portion that has at least one groove therein. A gasket having a predetermined cross-sectional shape is provided with at least one tongue portion that is adapted to engage the groove in an interference fit, thereby integrating the gasket with the end tank. A header is crimped to form a channel. The channel has a shape the corresponds to the shape of the gasket, such that the gasket is fully seated within the channel. A distal end of the header is then crimped around the flange of the end tank to ensure a fluid-tight seal at the joint.

Abstract: 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.

Abstract: A heat exchanger assembly with a first header, a second header, a plurality of seamed or folded type heat exchanger tubes extending between the two headers, and a plurality of heat exchanger fins. Each of the plurality of fins has between 0.01% and 0.9% magnesium to improve the braze between the header and tube joint and the tube seam to inner surface joint. Additionally, the headers have a cladded inner surface with between about 0% to about 12.6% silicon to improve the braze at the tube-to-header joint.

Abstract: Many recuperators have components which react to corrosive gases and are used in applications where the donor fluid includes highly corrosive gases. These recuperators have suffered reduced life, increased service or maintenance, and resulted in increased cost. The present header assembly when used with recuperators reduces the brittle effect of a portion of the ceramic components. Thus, the present header assembly used with the present recuperator increases the life, reduces the service and maintenance, and reduces the increased cost associated with corrosive action of components used to manufacture recuperators. The present header assembly is comprised of a first ceramic member, a second ceramic member, a reinforcing member being in spaced relationship to the first ceramic member and the second ceramic member.

Abstract: A heat exchanger includes a pair of manifolds, each of which has a plurality of axially spaced oblong slots. A plurality of generally flat tubes extends between the manifolds and individually through the slots for providing fluid communication between the manifolds. A plurality of radiation fins extends between adjacent flat tubes. At least one of the manifolds comprises a single formed rectangular sheet member having a seam formed from connection portions on each side edge of the sheet member. Each of the side edge connection portions includes an interlocking formation of tabs and recesses, at least some of the tabs deformed as the side edge connection portions engage each other in the circumferential direction. The interlocking formation provides an interconnection which is easier to form and after brazing less subject to burst when under pressure. End caps are provided on each end of the manifold, which include a concave shape which assists in holding the end caps in place when the manifold is pressurized.

Abstract: A multi-tube heat exchanger includes a pair of tanks and a plurality of heat transfer tubes fluidly interconnected between the tanks. The heat transfer tubes are arranged so that at least one of tube-arrangement surfaces formed on entrance and exit sides of the heat exchanger in a passage direction of air subjected to heat exchange is formed as two or more surfaces different from each other, and air flow is separated or joined in the multi-tube heat exchanger. An air conditioner according to the present invention has such a multi-tube heat exchanger in an air path. The multi-tube heat exchanger can be made smaller while a desired heat exchange property can be maintained. An air conditioner having such a heat exchanger also can be made smaller.

Abstract: A condenser for a motor vehicle air conditioning installation includes a fluid header in two parts, comprising an upper profiled element and a lower profiled element which are assembled together through their respective marginal regions. The marginal regions of the two elements are snap fitted together so as to hold them together before brazing.

Abstract: A heat exchanger includes a tank and a base plate, and each of the tank and the base plate is formed in a box shape having a U-shaped cross-section. The tank is connected to the base plate to close an end portion of an opening side of the tank using the base plate. Protrusion portions are provided inside a folded portion of the base plate in a lateral direction to be opposite to connection portions of first and second folded portions of the tank. Further, ribs are provided in the folded portion of the base plate in the lateral direction to increase stiffness of the base plate in a longitudinal direction thereof. Thus, connection portions of the tank and the base plate can be securely brazed.

Abstract: A second tubular portion, having a closed distal end, is formed at an inner surface of a connector block constituting the joint portion. A threaded hole, which is open to an outer surface of the connector block, is formed in the tubular portion. A bolt is threaded into the threaded hole to fix a piping joint to the connector block.

Abstract: A heat exchanger having a plurality of elongated, generally flat tubes is disclosed, each tube including a planar base, a top, and pair of arcuate opposed side portions interposed between the base and the top is disclosed. A partition extends from the top to the base to define a pair of fluid passageways, the partition including a pair of opposing, contacting shoulder portions and a leg portion depending from each of the shoulder portions which contact the base. A first braze receiving of predetermined size is defined between the shoulder portions and the manifold of the heat exchanger. The size of the braze receiving area is controlled by minimizing the curvature of the shoulder portions.

Abstract: A manifold for heat exchangers with a manifold segment having slots which are perpendicular to the tube axis and spaced in the longitudinal direction and separated by webs, into which hollow flat tubes can be inserted and joined to the contact surface of the respective slot. The webs each have a pair of stampings to strengthen the material on each side of each web and the webs are relatively flat in shape such that the cross-section of the manifold segment has a generally D-shaped profile. At least one generally D-shaped baffle is inserted in the manifold segment, centered between a pair of adjacend slots. End caps are provided to close the open ends of the manifold, and a bracket can be provided on the manifold to hold it in place. A method of manufacturing the manifolds is also presented.

Abstract: An inside wall surface of a cap covering the end portion of a header tank is formed into a spherical shape, and a connecting portion between the inside wall surface of the cap and a inside wall surface of a tank portion is separated away from a connecting portion between the inside wall surface of the tank portion and an outside wall surface of a tube. Thus, the brazing material is suctioned into both connecting portions (both gaps) sufficiently, and both connecting portions are brazed firmly.

Abstract: A heat exchanger includes reservoirs spaced apart from each other and a plurality of parallel heat transfer tubes fluidly connecting the reservoirs. An end portion of each heat transfer tube is connected to at least one of the reservoirs so that the end portion does not project into the interior of the reservoir. Thus, the dimension of the reservoir in the axial direction of the tubes and a proper volume of heat transfer medium may be minimized. Further, pressure loss can be reduced because there are no projecting tubes in the reservoirs to obstruct the flow of the heat transfer medium. Moreover, the strength of the connection between the tubes and the reservoirs can be increased because more contacting surface area is provided for making the connection, for example by brazing.

Abstract: In order to achieve an improvement in productivity and a reduction in production costs, tubes are formed using brazing sheet while eliminating the problems normally associated with forming tubes from a brazing sheet. In each of the tube elements formed from a brazing sheet, at least one ridge projects out from a surface that is in contact with a fin toward the other surface that is in contact with a fin at the opposite side is formed, thereby achieving an improvement in the pressure withstand performance of the tube elements and in the heat exchanging rate. In addition, flat portions where no ridges are formed are provided at the two ends of each tube element to facilitate the work of mounting the tube elements. Moreover, the distance between the header pipes and the ridge end portions is set within a range of 2 mm to 10 mm, in order to ensure good balance between the pressure withstand performance and effective brazing.

Abstract: A novel extruded aluminum condenser flow tube cross section includes a wider central web flanked by a pair of wider, inboard flow passages with rounded corners integral to the wider web. When inserted into the slot of a highly curved header plate, the wider central web corresponds to a central area of higher bending stresses, which are more strongly resisted. The two wider, inboard flow passages help compensate for the potential flow area removed by the wider central web.

Abstract: A heat exchanger, especially a heating or cooling radiator for a motor vehicle, has a tube bundle consisting of oval or oblong tubes which extend through a matrix of cooling fins. End portions of the tubes are introduced into holes in a header plate, with a compressible sealing gasket being interposed, the gasket having collar portions surrounding the tube end portions, and the latter having an oval or oblong cross section. The major axis of each tube end is equal to the major axis of the body of the tube, while the minor axis of the tube end is greater than the minor axis of the body of the tube as a result of the tube having been expanded or flared during the assembly of the heat exchanger.

Abstract: A radiator tank of the type that has a perimeter foot clinched into a U shaped header plate channel to compress an elastomer seal is improved with a means to help assure that portions of the gasket that are displaced from beneath the foot at installation either do not create leak paths, or create leak paths that are static and easier to detect. Integrally molded discrete ribs above the bottom of the perimeter foot extend out and over the inner surface of the header plate, in a location where they can engage and pinch displaced portions of the gasket down against the header plate. Leaks are thereby either prevented, or, at least, the displaced and pinched down section of the gasket is held fast and prevented from moving in and out of the crevice between the tank foot and the channel under the influence of negative to positive pressure variations in the coolant. This makes leak detection easier, because the leak is static and consistent.

Abstract: A heat exchanger has tubes inserted in headers easily to a given depth, and also has brackets which are readily attached to the headers. Each of the headers (3, 4) is divided into an inner half (5) and an outer half (6) facing the inner half in which apertures (5a) for receiving ends of the tubes are formed. The bracket (12) having a fastenable rib (12c) is fitted on the header over its halves (5, 6) so that these halves are made immovable relative to each other. Alternatively, the outer half (6) of the header may have a pair of embracing portions (12a) which fit on lateral sides of the inner half (5) so as to hold it in place.

Abstract: The grate element (1, 2) is made in three pieces in the sample embodiment, and consists of a central main part (10) and two side parts (11, 12) attached thereto. The main part (10) is pierced by parallel straight-line bores, which form the straight-line conduit sections. These straight-line conduit sections (13) are flow-connected with reversers (14) in the respective side parts (11, 12). The inlet (15) for the coolant fluid is located in the rear part of the grate element, whereas the outlet (16) is located in the head area (7) of the grate element. In the outlet (16) there is a temperature probe (17) for monitoring the temperature of the coolant fluid. The grate element head (7) has recesses (18) in its foot (8) which open downward, serving as air escape orifices for the primary air, which is supplied from beneath.

Abstract: A heat exchanger includes first and second header tanks and a plurality of flat tubes disposed therebetween. Each of the first and second header tanks is formed by connecting first and second groove members. The first groove member includes a main wall portion and a side wall portion to have a U-shaped cross-section. A plurality of tube-insertion holes are provided in the first groove member, and the tube-insertion holes extend from the main wall portion until an intermediate position of the side wall portion. The flat tubes are attached to the first and second header tanks by inserting both ends of each flat tube into the tube-insertion holes until the intermediate position. Further, a width of the first groove member in a width direction is set to be equal to each width of the flat tubes. As a result, the sizes of the first and second header tanks are reduced relative to the flat tubes, and the heat exchanger has downsized header tanks.

Abstract: A condenser for a cooling circuit conveying a refrigerant, including a bundle of tubes mounted between a first collecting box and a second collecting box, an inlet for the gaseous refrigerant, an outlet for the condensed refrigerant, and a reservoir through which the refrigerant may flow. The reservoir is housed in the collecting box and communicates via at least one aperture with a downstream portion of the bundle on the outlet side of the condenser. The condenser is useful for motor vehicle air conditioning.

Abstract: A heat exchanger comprises an as-cast combined header and tank having a header portion integral with a tank portion. The cast header and tank combination has a plurality of openings originally cast in the header portion of the combination and at least one opening originally cast in the tank portion of the combination for passage of coolant into or out of the cast header and tank combination. Tubes are received in and extends through the header portion openings, and resilient grommets seal the tubes to the header portion to prevent leakage around the tubes. In making the heat exchanger, there is provided an inner mold section and outer mold section corresponding respectively to the interior and exterior configurations of a desired combined header and tank having a header portion integral with a tank portion.

Abstract: At least one flow control member (127a) is fitted in a fitting groove (133) formed in a tank (121). An insertion hole (204) is formed in at least a part of the fitting groove (133). The flow control member (127a) has a projection (205) to be inserted into the insertion hole (204). The projection (205) is smaller in size than the insertion hole (204). The flow control member (127a) is arranged at a predetermined position within the tank (121). The fitting groove (133) is defined by a pair of side wall portions (203b) formed by internally cutting a tank wall of the tank (121) in a thickness direction along a pair of parallel cutting lines, and a guide portion (203a) formed by extruding a portion of the tank wall between the side wall portions (203b). The insertion hole (204) penetrates the guide portion (203a). The projection (205) has first and second tapered portions (351, 352, 354, 355) so that the thickness and the width are reduced towards the top end.

Abstract: A header tube for heat exchangers with a tube segment having slots which are perpendicular to the tube axis and spaced in the longitudinal direction and separated by webs, into which hollow flat pipes can be inserted and joined to the contact surface of the respective slot. The webs each have a pair of stampings to strengthen the material on each side of each web and the webs are shaped largely flat such that the cross-section of the tube segment has a largely D-shaped profile. A method of manufacturing the header tubes is also presented.

Abstract: A heat exchanger comprises a pair of spaced fittings each having a first opening on one side thereof for communication with a fluid carrying conduit. The fittings are connected to one another by at least one pair of tubes extending from second sides of the fittings in fluid communication with the first openings. The tubes diverge away from one another as they extend from the fittings and may be provided with heat dissipating fins. The tubes are preferably semi-circular in cross-section and in one form of the heat exchanger the tube ends are received by round openings in the fitting. By this construction, the use of header tanks and their associated disadvantages is avoided and a heat exchanger is provided which can withstand high internal pressures and is readily manufactured in a cost effective manner.

Abstract: A header plate has a central portion in which at least one row of holes are formed. The heat exchanger includes tubes which are fitted in these holes, and each hole is made in a press-formed element which comprises at least two raised elements aligned with each other. The respective dimensions of these raised elements are predetermined, and they are adapted to be pierced individually or in combination by means of perforating tools having different characteristic dimensions in at least the direction in which the raised elements are aligned with each other. Tubes of different dimensions in at least this alignment direction can be introduced into the holes.

Abstract: In a flat tube formed by machining a brazing sheet, ridges 12a-12c are formed at each of the opposing flat portions 11a and 11b of the flat tube 4 along the lengthwise direction of the flat tubes so that the ridges contact the inner surfaces of each of the opposite flat portions. The width of the grooves of the ridges 12a-12c formed at the surfaces of the flat portions is set so that it is at the smallest end portions of the flat tubes 4 to achieve flatness at the end portions of the flat tubes 4. The end portions of the fins 5 are bonded at these flattened portions 15 (areas A) formed at the end portions of the flat tubes 4. Header pipes and the flat tubes are thus brazed in a reliable manner while achieving reinforcement of the end portions of the flat tubes to be inserted into insertion holes formed in the header pipes.

Abstract: A heat exchanger assembly (10) for transferring heat comprising a heat exchanger core (12) having adjacent hollow tubes (14), heat exchanger fins (16) interconnecting adjacent tubes (14), and a plastic header (18, 118) molded about each of the ends of the tubes (14). A cover (22, 122) at the top and bottom of the heat exchanger core (12) attaches to each of the headers (18, 118) about the ends of the tubes (14) to enclose the tank. The invention includes a method for making the heat exchanger assembly (10) by molding the plastic header (18, 118) about each of the ends of the hollow tubes (14).

Abstract: In heat exchanger such as an automotive radiator, an improved tank to header joint is provided. The header and tank can be provided hooks shaped portion and cooperating tabs that are assembled in an interlaced and locked together by a pin inserted therebetween. An elastomeric seal is can be disposed between the opposed surfaces of the tank and header.

Abstract: A heat exchanger includes a pair of header pipes spaced a predetermined distance away from each other, a plurality of tubes connected between the header pipes for defining flow paths for a heat exchanging medium and a plurality of fins installed between the tubes for radiating heat from the heat exchanging medium. Each of the header pipes includes a flat bottom portion formed with a plurality of apertures for receiving the plurality of tubes, a pair of vertical walls extending from both side ends of the flat bottom portion and having a plurality of grooves corresponding to the apertures for guiding the tubes, and curved portion extended from the walls and forming a hollow inner space by joining both side edges thereof.

Abstract: The invention relates to a heat exchanger tank to be mounted in a heat exchanger, preferably an oil cooler. The tank has an elongate casing (1) with two opposite end openings (11, 11') and a side opening which extends from end opening to end opening. The tank also has two end pieces (6, 6') which sealingly connect to each end opening (11, 11') respectively, and a connecting plate (2) for connection to a heat exchanger assembly included in the heat exchanger. The connecting plate (2) sealingly connects to the boundary edges of the side opening. At each end opening (11, 11') the casing (1) is provided with at least one receiving means (10). Each end piece (6, 6') has at least one recess (14) aligned with the receiving means (10) of the casing (1). A fixing means (17) is inserted through the recess (14) and is fastened in the receiving means (10) of the casing (1). At least one engaging means is arranged at the respective end pieces (6, 6') engaging an end section of the connecting plate (2).

Abstract: A heat exchanging apparatus is capable of efficiently heat exchanging a large quantity of fluids and whose construction can be simplified. A heat exchanging flowpassage (10) is arranged internally of a heat exchanging vessel to and from which a liquefied nitrogen as a heat transfer medium is supplied and discharged. The heat exchanging flowpassage (10) has annular tubes (18) arranged in plural rows, the adjoining annular tubes (18) are communicated at plural locations by communicating tubes (19) at positions deviated in a peripheral direction, and tanks (20) and (21) are communicated with a supply port side and a discharge port side. A supply tube (11) is communicated with the tank (20), and a discharge pipe (12) is communicated with the tank (21).

Abstract: A manifold for directing and channeling the flow of fluid to and from a plurality of interdigitated counterpropagating flowing streams, comprising a continuous folded sheet enclosing a volume, where one aperture in the volume serves as an exit or entrance for a single fluid stream, and a plurality of apertures serve as entrances or exits respectively for a plurality of streams flowing in a first direction, the plurality of streams interdigitated with a plurality of streams flowing in the opposite direction.

Abstract: A quench cooler or transferline heat exchanger for quenching the effluent from a thermal cracking furnace has an inlet connector between the cracking furnace tubes and the tubes of the quench cooler. The tubes of the quench cooler are arranged in a circular pattern of spaced tubes. The flow passage of the connector is configured to initially decelerate and then re-accelerate the gas. This involves a conical diverging diffuser followed by a radial diffuser and then an annular converging section. The cross sectional transitions are smooth to avoid dead spaces and minimize pressure loss.

Abstract: In a heat exchanger tank, a connecting plate along its longitudinal side edges is provided with flange sections which extend substantially perpendicularly from the connecting plate, the flange sections of the connecting plate each have at least one engagement surface, the legs of a casing at their free end edges are provided with engagement means extending in the longitudinal direction of the casing, the engagement means of the casing lockingly engage the engagement surface of the respective flange section, and sealing connections of the plate with the legs are achieved by brazing.

Abstract: 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.

Abstract: Restrictions on the major dimension of flattened tubes used in heat exchangers employing oval shaped, two piece headers/tank assemblies can be minimized in a construction including a plurality of flattened tubes (14) each having a minor dimension and a major dimension transverse thereto and extending in spaced parallel relation. Fins (16) are in heat exchange relation with the tubes (14) and a pair of spaced, parallel, elongated headers/tank assemblies (10, 12) are provided between which the tubes (14) extend. At least one of the headers/tank assemblies (10, 12) is a multiple piece header/tank assembly including a header piece (20) and a separate tank piece (22). The header piece (20) is elongated and provided with a plurality of slots (28) sized to receive ends of the tubes (14) with the tube major dimensions being generally transverse to the direction of elongation of the header piece (20). The header piece further includes a peripheral flange (24).

Abstract: A radiator has at least one radiator tank containing an integrated heat exchanger. The heat exchanger and the radiator tank each have inlet and outlet fluid communication connectors. The heat exchanger and the radiator tank, including the connectors are integrally as a single-piece, of a same material. This simplifies manufacture and improves durability. Because the radiator tank and the integrated heat exchanger are made of just a single type of material, recycling is made simpler.

Abstract: A heat exchanger includes a tank having a pipe insertion hole disposed in a tank wall and a fluid pipe connected to the tank wall for introducing a fluid into the tank or discharging the fluid from the tank. The tank wall has a burr formed around the pipe insertion hole extending toward an interior of the tank. The fluid pipe has a flange formed on its periphery by bending the fluid pipe onto itself. An end portion of the fluid pipe is inserted into the pipe insertion hole so that the flange contacts an outer surface of the tank wall, and the inserted end portion is expanded and caulked together with the burr. A brazing material may be fixed between the flange and the tank wall during brazing even during vibration. The length of the pipe inserted into the tank may be minimized. The contact area between the fluid pipe and the tank is thereby enlarged.

Abstract: 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.

Abstract: A cooler structure of stirling engine is designed to make it easier for the production of the cooler by using brazing soldering techniques, and which in turn reduces the loss of the heat being transmitted to the cooling water and the displacer seal. The invention includes a sealing filler metal having the same depth formed around the circumference of each surface of the upper and lower plates which seals the radiator tubes to be fixed and sustained by the upper and lower plates. An adiabatic part is formed between the upper plate having a projection maintaining a predetermined length toward the inner low part. The internal cylinder prevents the passing of the heat from the internal cylinder to the radiator tube.

Abstract: A condenser for a refrigerating circuit, in particular an air conditioning installation for a motor vehicle, comprises two headers at respective ends of a bundle of tubes, together with a reservoir communicating with one of the headers. The reservoir and this header are integrated within a common casing having a tubular wall which is divided, by a longitudinal separating baffle, into a collecting chamber, constituting the header into which the tubes of the condenser are open, and a reservoir chamber which communicates with the collecting chamber through apertures formed in the longitudinal baffle. This baffle has a longitudinal edge engaged in a longitudinal slot in the casing wall, and another longitudinal edge which bears against the tubular wall, so that the various components can be secured together by brazing.