Abstract: A flat or a flared tubular end portion devoid of dimples is provided at the end of a tube 11 which is to be inserted into a header with the length, of the flat tubular portion being 1.5 mm or less along the direction of the length of the tube to prevent rapid reduction and enlargement of the cross-sectional area of the refrigerant path in the vicinity of the joint of the tube and the header, so as to reduce the pressure loss of the refrigerant which flows in and out from the header to the tube. A tube insertion stop is also provided consisting either, of a cut formed in the longitudinal edge of the flat end portion or a guard member which is formed aft of the flared, end portion so as to abut the header and seal off the tube insertion aperture of the header.

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 heat exchanger for heat extraction of a refrigerating fluid such as CO2, comprising at least one collecting box defined by a solid body (41) with a thick wall capable of resisting the high pressure of said fluid, and communicating with a row of flat tubes (44). In order to limit bulkiness in the width of the heat exchanger, only one part of the length of the cross section of the tubes is located opposite the inner volume of said body, whereby tightness of the fluidic communication between the tubes and the inner volume is obtained by means of a cradle (50) in the form of a shaped strip receiving the body and brazed thereto on the periphery of the tubes. The heat exchanger can be used to air condition passenger compartments in vehicles.

Abstract: A heat exchange device comprises two arrays of tubes through which flow two respective fluids. The device comprises a common support plate for the two arrays, which has a first portion provided with holes to act as a header plate for a first array and a second portion provided with openings for receiving in a forced fit manner the tubes of a second array with curved connectors. In one embodiment of the invention one array contains an engine cooling fluid and the other array contains a refrigerant fluid of an air-conditioning circuit.

Abstract: An extruded D-shaped manifold machined from extruded tubing is generally D-shaped in cross-section, with the header being thicker than the tank. At least two longitudinal external ribs are formed on the header exterior, preferably positioned symmetrically relative to the longitudinal axis of the header. The external ribs provide additional strengthening of the header and act as stops to prevent the heat exchanger fins from contacting the tube/manifold joint (which can lead to leakage when the joint is brazed). The number of external ribs and their location depend on the size of the manifold and the precision required in positioning the heat exchanger tubes in the slots. The manifold can be extruded with lengthwise internal ribs extending along the interior sides of the tank to act as stops for the heat exchanger tubes.

Abstract: A multiple tube bundle heat exchanger includes axially opposite tube plates, a housing, and a plurality of tube bundles disposed between the tube plates. Each of the tube bundles is an independent tube bundle subassembly forming an integral unit having at least one heat exchanger tube with two axial tube ends. The subassembly is made from the exchanger tube and respective tube plates fastened to the two axial tube ends. The housing has a casing part defining a interior and having two axial housing ends with flanges, removable head pieces respectively disposed at the two axial housing ends to be fastened to the flanges, and partitions subdividing the interior into chambers. The number of chambers corresponds to a number of tube bundles. Each of the chambers receives one of the tube bundles. The tube plates and head pieces respectively form seals, and the tube plates delimit distributor, collecting, and/or transfer chambers formed in the head pieces.

Abstract: The present invention provides a heat exchanger including a tank, a plurality of tubes in fluid communication with the tank, and a plurality of fins extending between the tubes. The tank includes a header member and a cover member, each of which is formed from a single sheet of aluminum. The header member includes an elongate generally planar base section having first and second ends and a middle portion disposed between the first and second ends. The header member also includes a flange section that extends along one edge of the base section and a wall section that extends along the opposite edge of the base section. The cover member has a central section that is spaced apart from the middle portion of the header member and a periphery that is joined to the first and second ends of the base section, the flange section, and the wall section. The cover member is preferably joined to the header member by brazing.

Abstract: The condenser assembly structure is disclosed. The opening of the outgoing pipe is positioned below the upper openings of the heat transfer tubes in the inner space of the upper header pipe. Cutouts are formed in the upper ends of heat transfer tubes, which are located within an upper header pipe. A lubricant mixed in a refrigerant is introduced from the inside of the upper header pipe into the heat transfer tubes by way of the cutouts. The outgoing pipe defining is attached to the lower header pipe at a position close to its end. A total passage area of first heat transfer tubes through which the refrigerant flows downward is larger than that of second heat transfer tubes through which the refrigerant flows upward. The total passage area of the second heat transfer tubes is smaller than that of third heat transfer tubes through which the refrigerant flows downward.

Abstract: A heat exchanger manifold (10) and method of forming a tube port (50) on the manifold (10). The manifold (10) comprises first and second walls (12,14) that define an internal passage (18) and an outer cross-sectional shape of the manifold (10). The first wall (12) of the manifold (10) has a concave outer surface in which the tube port (50) of the manifold (10) is to be formed, while the second wall (14) has a convex outer surface. The tube port (50) is formed in the concave first wall (12), such as by piercing. The shapes of the first and second walls (12,14) promote the ability of the manifold (10) to resist deformation when forming the tube port (50) in the first wall (12).

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: An evaporator comprises a pair of upper and lower horizontal header tanks, a group of heat exchange tubes arranged laterally of the evaporator in front and rear two rows and each connected to the upper header tank and the lower header tank respectively, and a vertical partition wall provided inside the upper header tank and extending laterally of the evaporator so as to form sectioned header chambers for causing a refrigerant to flow through each pair of front and rear adjacent heat exchange tubes in directions opposite to each other. An inlet is provided for a liquid-vapor mixture refrigerant in a sectioned rear header chamber, and an outlet is provided for vaporized refrigerant in a sectioned front header chamber. The evaporator is 3 to 30% in channel opening ratio.

Abstract: A heat exchanger includes a pair of hollow headers, a plurality of tubes communicated with the headers, corrugated fins disposed between adjacent tubes and at an outside of an outermost tube and a side plate disposed at an outside of an outermost corrugated fin. The header insertion end portion of the side plate is formed into the same or approximately the same cross-sectional peripheral configuration as that of an end portion of the tube, and the side plate fitting aperture is formed into the same configuration as that of the tube fitting aperture. This becomes unnecessary to form a special fitting configuration at the end portion of the side plate, and moreover the workability for forming the side plate fitting apertures and the tube fitting apertures can be enhanced, resulting in enhanced productivity, which in turn can reduce the manufacturing cost.

Abstract: An evaporator for an HVAC system is disclosed wherein an upstream to downstream airflow is directed through the evaporator for inducing a transfer of thermal energy between the airflow and a fluid circulating in the evaporator. The evaporator includes at least two cores adjacent one to the other. Each of the cores defines a core inlet and a core outlet and the cores are arranged such that the core inlet of the first core is positioned at an opposite end from the inlet of the second core. Correspondingly, the outlet of the first core is positioned at an opposite end from the outlet of the second core. The evaporator inlet is in fluid communication with the first core inlet and the second core inlet and the outlet is in fluid communication with the first core outlet and the second core outlet.

Abstract: A “header-less” radiator utilizes a radiator core including tubes having end walls which are bifurcated for a short distance from the ends of the tubes and having one or both of the sidewalls in the bifurcated segment of the tube formed outward and adapted to contact and be joined in a fluid tight manner with the sidewall of an adjacent tube in the radiator core. A collecting tank has walls extending partially over the core to a distance beyond the bifurcation of the sidewalls, and joined to the end walls of the tubes in a fluid tight manner, such that the walls of the collecting tank in conjunction with the bifurcated end walls and outwardly formed side walls of the tubes define a common fluid plenum providing fluid communication between the tubes and the collecting tank.

Abstract: A heat exchanger is constructed by tubes, corrugated fins and head pipes, which are assembled together. Herein, the tube is constructed by bending a flat plate whose surfaces are clad with brazing material to form a first wall and a second wall, which are arranged opposite to each other with a prescribed interval of distance therebetween to provide a refrigerant passage. Before bending, a number of swelling portions are formed to swell from an interior surface of the flat plate by press. By bending, the swelling portions are correspondingly paired in elevation between the first and second walls, so their top portions are brought into contact with each other to form columns each having a prescribed sectional shape corresponding to an elliptical shape or an elongated circular shape each defined by a short length and a long length.

Abstract: A heat exchanger for enabling the flow of a heat exchanging medium disclosed. The heat exchanger comprises a collecting box having a peripheral edge; a tube bottom having a peripheral edge and a plurality of openings, the peripheral edge of the tube bottom being coupled to a peripheral edge of the collecting box; an intermediate bottom having a plurality of openings and a peripheral edge, the peripheral edge coupled to the peripheral edge of the tube bottom; and a plurality of flat tubes coupled to the plurality of openings in the intermediate bottom. A method of manufacturing a heat exchanger is also disclosed. The method comprising the steps of coupling a collecting box to a tube bottom; coupling an intermediate bottom to the tube bottom; and coupling a plurality of flat tubes to the intermediate bottom.

Abstract: A condenser for vehicle air-conditioning systems, comprising a pair of parallel distributors (12) between which there is set a heat-exchange core (14) including a plurality of pipes (16) having a flat cross section, which are parallel to one another, and a plurality of undulated fins (18) set between each pair of adjacent pipes, in which a reinforcing element (22) is applied on at least one end side (20) of the heat-exchange core (14). The aforesaid reinforcing element (22) is fixed directly on an end pipe (16a) of the heat-exchange core (14).

Abstract: A heat exchanger comprising a first coil assembly including an inlet manifold; an outlet manifold parallel to and spaced from the inlet manifold; and a plurality of tubes each operably connected to and linking the inlet and the outlet manifolds, each tube having a multiplicity of flow paths and a hydraulic diameter in the range of 0.05≦ to HD≦0.30.

Abstract: A heat exchanger and method of making a heat exchanger which includes providing a header having openings adapted to receive a plurality of tubes. The tubes are inserted into the header openings, then, substantially uncured fluid sealing material is applied to at least the inner surfaces of the header openings. The inner surfaces of the header openings and the outer surfaces of the tubes are connected by the sealing material. The method further includes curing the sealing material after the tubes are inserted into the header openings. The sealing material thus provides a flexible, bonded, liquid tight, tube-to-header joint.

Abstract: In a brazed condenser for an air conditioner, such as a motor vehicle air conditioner, a collecting tube connected with a collector is a prefabricated as a one-piece tube which is connected by tack weld seams with the collector before brazing the collecting tube and the collector together.

Abstract: A heat exchanger (10) comprising a plurality of plastic tubes (12) arranged in a series of mutually parallel rows and a pair of plastic collector plates (14) bonded to the respective ends of the said tubes (12). Each collector plate (14) is formed by a plurality of plastic terminal elements (22), each of which has at least one set of semicircular seats (24 and 26) suitable for receiving the ends of a row of tubes (12). The said semicircular seats (24 and 26) of each terminal element (22) are separated from each other by bonding portions (28 and 30) suitable for welding to the corresponding bonding portions of a complementary terminal element along a welding plane (34).

Abstract: A heat exchanger (10), such as a radiator, includes a metal tank (12) having a foot (28) that is integrally formed therewith. The heat exchanger (10) also includes a header (14) having a plurality of crimping tabs (44) extending therefrom. The integral foot (28) of the metal tank (12) has an upper surface (30) and a lower surface (32) with the lower surface (32) intended to rest within an internal channel (46) formed in the header (14). The crimping tabs (44) are folded around the footer (28) so as to lie above and generally parallel to the footer upper surface (30) in order to retain the metal tank (12) in proper alignment with the header (14). After the metal tank (12) and the header (14) are physically assembled, they are sealed to form a leak-free joint.

Abstract: In a core portion of the receiver-integrated condenser, a condensing portion is disposed at an upper side of a super-cooling portion. A receiving unit is disposed at one end side of the core portion in a width direction, and refrigerant is U-turned in a refrigerant passage of the super-cooling portion at the other end side of the core portion in the width direction. In addition, a refrigerant outlet of the super-cooling portion is provided at the one end side of the core portion, a connector connected to the refrigerant outlet is disposed at a direct lower side of the refrigerant outlet, and the connector has a bottom surface used as a connecting surface connected with a pipe connector of a refrigerant pipe.

Abstract: A heat exchanger of the multi-flow type is provided with baffle members which are adapted to impart a zigzagging flow to the heat-exchange fluid in motion inside a flat tube and define, in conjunction with the inner wall of the flat tube, a flow path of a cross-sectional area having an equivalent diameter in the range of 0.4 to 1.5 mm. This heat exchanger excels in heat exchange ability and in facility of manufacture and assemblage.

Abstract: An evaporator and method of making same includes a first end tank, a second end tank spaced from and opposing the first end tank, and a plurality of extruded fluid carrying tubes extending between and in fluid communication with the first end tank and the second end tank. The first end tank and the second end tank are formed as stampings.

Abstract: A radiator assembly (10), including an end tank (12) having a first mating surface (14) and a heat exchanger (16) having a second mating surface (18). The heat exchanger (16) is adhesively bonded to the end tank (12) with an adhesive (22).

Abstract: A heat exchanger comprising a core assembly having a plurality of tubes connected by an array of fins, with ends of the tubes extending from the fin array on at least one side of the core assembly and resilient, polymeric grommets disposed around, the tube ends. The heat exchanger includes a tank portion for receiving fluid entering or leaving the core assembly and a header portion having openings to receive the tube ends and grommets to create a sealed, fluid-tight tube-to-header joint. There is provided a reinforcing member across the opening of the tube ends extending from the tube end opening to the portion of the tube end around which the grommet is disposed without substantially extending into the fin array portion of the core assembly. The header portion comprises a substantially planar base having openings therein with side and end walls extending out of the plane of the base and connected by one or more fluid-tight welds to the tank portion.

Abstract: The invention concerns a heat exchanger comprising an array of tubes (10) mounted between two fluid boxes (28, 46) via respective manifolds (16) and designed to be run through by a fluid. The tubes (10) comprise each several channels separated by at least a longitudinal partition and are arranged in a single row, parallel to tow large surfaces of the exchanger, such that the fluid circulation takes place in at least two layers parallel to the large surfaces of the exchanger and formed each by part of tube channels. One at least of the fluid boxes (28, 36) comprises an internal longitudinal partition dividing the fluid box into at least two longitudinal sections communicating with the two layers respectively. The invention is in particular applicable to air conditioning evaporators.

Abstract: A heat exchanger employing a dimple tube in which sufficient strength is provided by improving the processing accuracy of the dimple tube and decreasing the processing error. The tube includes a plate folded in two so as to make two edges of the plate contact each other and form a flat tube. The plate comprises protrusions provided on each inner wall of the flat tube in a manner such that the heads of opposed protrusions on both the inner walls contact each other. The plate is clad with a brazing filler metal and the protrusions are formed on a surface of the plate before the plate is folded, and the two edges of the plate and the heads of the opposed protrusions are respectively brazed after the plate is folded. A predetermined number of sets of the opposed protrusions, positioned closest to the end of the tube, are larger than the other protrusions in a manner such that their size along the longitudinal direction of the tube is larger.

Abstract: A tank of heat exchanger comprises a tank body and a metal member. The metal member is at least one of a pipe member, a header plate member, an end plate and a filler neck member. The tank body is made of a metal and shaped like a channel member including a base wall and opposed side walls between when the base wall extends. The metal member is hermetically secured to a given portion of the tank body by partially welding the metal member to the given portion and then brazing the metal member to the given portion.

Abstract: A stacked-type, multi-flow heat exchanger includes a first header pipe and a second header pipe formed opposite the first header pipe. The heat exchanger also includes a plurality of heat transfer tubes extending between the first header pipe and the second header pipe, such that the first header pipe and the second header pipe are in fluid communication via the heat transfer tubes. The heat exchanger further includes a plurality of fins alternately stacked with the plurality of heat transfer tubes. Moreover each of the ends of the first header pipe includes a first tapered portion having a reduced diameter relative to a diameter of a center portion of the first header pipe. In another embodiment, each of the ends of the second header pipe includes a second tapered portion having a reduced diameter relative to a diameter of a center portion of the second header pipe.

Abstract: A heat exchanger manifold comprising tank and header members secured together, each of the tank and header members having an interior surface facing the interior of the manifold. The header member comprises at least one raised surface feature on its interior surface so as to define longitudinal channels in the interior surface of the header member, and longitudinal passages within the manifold. One or more openings extend through the header plate and the raised surface feature. The width of at least one of the openings through the surface feature is less than the remainder of the opening, so that a portion of the surface feature defines a tube stop that limits the extent to which a tube received in the opening can extend into the interior of the manifold.

Abstract: In a refrigerant heat exchanger, a flow direction of refrigerant flowing through tubes in each of first and second units is opposite to that flowing through tubes in each of third and fourth heat-exchanging units arranged at upstream air sides, the flow directions of refrigerant flowing through first header tanks for distributing refrigerant into the tubes of the first and fourth units are the same, and the flow directions of refrigerant flowing through first header tanks for distributing refrigerant into the tubes of the second and third units are the same. Accordingly, even when a flow direction (flow rate) of refrigerant is small, a uniform temperature distribution of air can be obtained in the refrigerant heat exchanger.

Abstract: A heat exchanger has a tank for accommodating a heat medium therein and a tube connected to the tank through a core plate. Specifically, an end portion of the tube is inserted into a connection hole of the core plate and is mechanically joined thereto. A joined portion of the tube and the core plate is covered with adhesive through a wettability improving film for improving wettability of the adhesive to the joined portion. As a result, a sealing property between the tube and the core plate is easily and stably improved by the adhesive.

Abstract: In a condenser for an air-conditioning system, in particular for an air-conditioning system of a motor vehicle, there is provision for a collector (15) to be formed from a plurality of series-connected tubes (18) which extend between header tubes (10, 11) and the cross section of which is a multiple of the cross section of the flat tubes (13).

Abstract: Tanks of a first heat exchanger have plane sections perpendicular to bottoms having a plurality of tube insertion holes formed therein. Tanks of a second heat exchanger with circular cross sections have bottoms having a plurality of tube insertion holes formed therein. The axes of the tube insertion holes of the first and second heat exchangers are held in parallel with each other. The second heat exchanger is in contact with the plane sections of the first heat exchanger tank.

Abstract: A heat exchanger, comprising a shell designed as a pressure vessel provided with shell-sided supply and discharge means with which the shell can be flowed through with a first medium under pressure. The heat exchanger further comprises a nest of tubes extending at least partly within the shell, provided with tube-sided supply and discharge means with which the tubes from the nest can be flowed through with a second medium in heat exchanging contact with the first medium under pressure. The individual tubes of the nest are each included with a supply and a discharge side in tube bores extending substantially transversely to the plane of a tube plate included in the shell. The heat exchanger has the special feature that the tubes are connected with the tube-sided supply and discharge means via connecting channels located in the plane of the tube plate and crossing the tube holes.

Abstract: A heat exchanger manifold for use in heat exchanger used mainly in automobiles is provided. The manifold comprises of two components a header and tank. The header consists of several half cylinders that have ferrule openings and communication port stamped on them. The communication ports are in form of channels that coincide with the ferrule opening. The ferrule openings allow the heat exchanger tubes to slide into the manifold and without any interference. The second component of the manifold comprises a tank. Like the header the tank also consists of several half cylinders, which combined with the header forms several full cylinder. The tank also includes an integral seal along the mating end of the manifold. The manifold also contains a unique inlet/ outlet port that allows for ease of assembly of the final heat exchanger.

Abstract: Problems due to fin fall-out in the manufacture of heat exchangers having flattened tubes (14) with interposed serpentine fins (16) are eliminated by providing the exterior sides (22), (24) of the tube (14) with elongated, relatively sharp ridges (36). The ridges (36) form deformations (52) in the crests of the fins (16) which lock the fins (16) and the tubes (14) together during the brazing process, thereby preventing such fall-out.

Abstract: In a heat exchanger achieving a smaller width and constituted as a two-path heat exchanger having a first path through which the coolant travels from a first tank group to a second tank group and a second path through which the coolant travels from a third tank group to a fourth tank group to improve the temperature distribution in the heat exchanger and the heat exchanging capability, the coolant flows in opposite directions in the first path and the second path, the high-temperature area in the first path and the low temperature area in the second path are aligned with each other along the direction of the airflow and the high temperature area in the second path and the low temperature area in the first path are aligned with each other along the direction of airflow.

Abstract: A heat exchanger is assembled in a simple and cost-effective way and needs a relatively low space requirement. According to the invention, the tubes (11) are expanded at the tube ends (16) in such a way that the tube ends (16) are of rectangular design in cross section. The tube ends (16) have parallel long connecting surface (18) which are brought into bearing contact with long connecting surfaces (18) of adjacent tube ends (16). Furthermore, the tube ends (16) have short connecting surfaces (22), onto which the collecting tanks (23,29) are placed with their legs (24, 25) or collars (30, 31). A space-saving heat exchanger can be produced in a simple way by soldering the long connecting surfaces (18) together, on the one hand, and by soldering the short connecting surfaces (22) to the collecting tanks (23, 29), on the other hand.

Abstract: The invention relates to a serpentine heat exchanger having a first serpentine tube block (12a) comprising one or more adjacent first serpentine tube sections with parallel through-flow and a second serpentine tube block (12b) disposed behind the first and comprising one or more adjacent second serpentine tube sections with parallel through-flow. According to the invention, at least one of the second serpentine tube sections is connected in series for flow purposes via a diversion section (10, 11) to a first serpentine tube section lying adjacent thereto.

Abstract: Disclosed is a condenser and especially a tube therefor which is particularly suited for use in condensers that operate at operating pressures of approximately 20 bar. The condenser is a flat-tube condenser having tubes of substantially flat cross section extending between header tubes and cooling fins supported on the flat surfaces of the tubes. The tubes have a substantially flat cross section and a plurality of flow channels disposed side by side. The flow channels are substantially circular and have a hydraulic diameter of from 1.10 mm to 1.30 mm. Tubes of flat cross section and circular flow channels disposed in series operate with a particular advantageous effect in serpentine condensers.

Abstract: In a receiver for separating gas refrigerant and liquid refrigerant and for storing liquid refrigerant for a refrigerant cycle, refrigerant form a condensing portion of a condenser flows into an upper side of a tank member of the receiver from a first refrigerant inlet and flows into a lower side of the tank portion from a second refrigerant inlet. Further, liquid refrigerant stored in the tank member of the receiver is discharged to an outside through a refrigerant outlet. Accordingly, refrigerant from the condensing portion of the condenser flows into the tank portion of the receiver from both upper and lower sides of a gas-liquid boundary surface. As a result, it can prevent the gas-liquid boundary surface of the receiver from being disturbed during a refrigerant introduction of the receiver, while cooling effect of the upper side of the receiver is effectively improved.

Abstract: Thermally induced failures at the tank/header joint of a charge air cooler are reduced by applying a body of elastomer 42,54, to the side 38,53 of the inlet side header 18 to which inlet tank 10 is welded. As a consequence, the elastomer 42 causes the header 18 to operate at a lower temperature than would otherwise be the case so that its thermal expansion approximates that of the tank 10 eliminating thermal stresses at their interface.

Abstract: Tanks of a first heat exchanger have plane sections perpendicular to bottoms having a plurality of tube insertion holes formed therein. Tanks of a second heat exchanger with circular cross sections have bottoms having a plurality of tube insertion holes formed therein. The axes of the tube insertion holes of the first and second heat exchangers are held in parallel with each other. The second heat exchanger is in contact with the plane sections of the first heat exchanger tank.

Abstract: A radiator has plural metal tubes and a metal header tank. The header tank has plural connection portions each of which is connected to each of the tubes, and plural reinforcement ribs formed opposite the connection portions at a non-connection portion of the header tank to which no tube is connected. The reinforcement ribs and the connection portions are arranged in a longitudinal direction of the header tank at substantially the same pitch, so that each of the reinforcement ribs is disposed opposite each of the connection portions. Therefore, a rigidity of the non-connection portion is increased by the reinforcement ribs, and an internal pressure of the header tank is restricted from being intensively applied to the non-connection portion. As a result, a mechanical strength of the header tank is sufficiently increased without increasing a thickness of a metal plate from which the header tank is formed.

Abstract: Disclosed is a head assembly of a heat exchanger for a vehicle including heads each consisting of a plurality of head pieces coupled together in a laminated fashion, thereby being capable of achieving an easy manufacture thereof and a reduction in manufacturing costs while easily coping with a changed specification. The head assembly includes at least two heads spaced apart from each other, a plurality of tubes coupled between the heads in a laminated state and defined with fluid passages, respectively, and a plurality of centers each interposed between adjacent ones of the tubes and adapted to provide an improved heat exchange efficiency. Each of the heads includes at least two head pieces assembled together in a laminated state. A separator is interposed between the head pieces. Caps are coupled to opposite ends of the head pieces, respectively.

Abstract: The condenser assembly structure is disclosed. The opening of the outgoing pipe is positioned below the upper openings of the heat transfer tubes in the inner space of the upper header pipe. Cutouts are formed in the upper ends of heat transfer tubes, which are located within an upper header pipe. A lubricant mixed in a refrigerant is introduced from the inside of the upper header pipe into the heat transfer tubes by way of the cutouts. The outgoing pipe defining is attached to the lower header pipe at a position close to its end. A total passage area of first heat transfer tubes through which the refrigerant flows downward is larger than that of second heat transfer tubes through which the refrigerant flows upward. The total passage area of the second heat transfer tubes is smaller than that of third heat transfer tubes through which the refrigerant flows downward.

Abstract: A charge air cooler includes a tube block having a plurality of finned tubes and a tank assembly at each end. Each of the tank assemblies includes a tank body for receiving one of the ends of the finned tubes in the tube block. A connecting plate, a heat resistant flexible gasket and a backing plate provide a first resilient seal with each of the tubes and the connecting plate. A flexible annular seal extends around the connecting plate for providing a second resilient seal between the connecting plate and the tank body. The connecting plate includes a base having a plurality of spaced tabs extending therefrom, and the tank has a plurality of spaced raised bosses around the exterior thereof adjacent the open face of the tank which are so sized and positioned as to interdigitate when the tank is assembled to the connecting plate.