Abstract: A heat exchanger for cooling exhaust gas of a motor vehicle with a closed flow guiding system for the exhaust gas has heat exchange elements which are arranged between a feeding device and a removing device for the exhaust gas and around which a cooling medium flows. Heat exchange elements are disk-shaped and are each joined together from two metal sheets. At least one turbulence insert 20 is arranged between the sheets and comprises projections which extend diagonally with respect to the flow direction and project upwards from a surface.

Abstract: A stack type evaporator includes tubular elements 1 each having a plurality of inwardly protruding recessed ribs 7 which extend from an upper header portion 1a of the element to a lower header portion 1b, with the ribs serving as straight drainage canals 7a of specified width and area. A hydrophilic resin coating of a specific composition covers the outer surfaces of the tubular elements 1 and fins 2 each interposed between two adjacent tubular elements. The combination of straight drainage canals, the specified width and area thereof and the specific hydrophilic resin coating is effective to facilitate the drainage of condensed water so that the waterdrop is substantially prevented from flying out of the evaporator, and the hydrophilic coating itself does not emit any unpleasant smell.

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 plate type heat exchanger as disclosed having a plurality of stacked plate pairs. Each plate pair has opposed inlet and outlet openings that are in registration to form respective inlet and outlet flow manifolds for the flow of fluid through the plate pairs. Each of the inlet and outlet openings has an inner peripheral edge portion including opposed, flange segments extending inwardly and being joined together to prevent expansion of the manifolds under pressure.

Abstract: A heat exchanger includes a header having tube insertion holes and heat transfer tubes, wherein each of the heat transfer tubes has an end portion inserted into a corresponding tube insertion hole. A burr is formed on a wall of the header around each tube insertion hole to extend in a direction toward an interior of the header. The burr has a bent tip portion formed by bending at least a part of a tip portion of the burr inwardly. A tip of the end portion of each heat transfer tube inserted into a corresponding tube insertion hole contacts with the bent tip portion of the burr. The bent tip portion of the burr seals a gap formed between an outer surface of the inserted end portion of the tube and an inner surface of the burr when the header and the tubes are assembled and brazed, thereby preventing leakage of a heat exchange fluid through such a gap. The insertion depth of the tube is reduced by the bent tip portion of the burr, thereby decreasing pressure loss in the header.

Abstract: A laminated type heat exchanger includes a plurality of tube elements laminated so as to form a first tank portion, a second tank portion, and a third tank portion in a laminated direction. Each tube element includes a first flange, a second flange, and a third flange for the first tank portion, the second tank portion, and the third tank portion, which are brazed with a first flange, a second flange, and a third flange of an adjacent tube element, respectively. The first flange is folded inside the first tank portion, the second flange is folded outside the second tank portion, and the third flange is folded outside the third tank portion. In this way, it is possible to reduce the flow resistance of the refrigerant flowing in the tank portions.

Abstract: A heat exchanger of a plate construction, as used, for example, in a water-cooled charge air cooler with air-side lamella plates avoids undesirable thermal expansion effects which occur in the transient operation of a charge air cooler and result in damage. The otherwise completely hard-soldered cooler block is divided along a plane parallel to the plate planes into two or more partial blocks. When the partial blocks are combined at a mutual distance to form a cooler block assembly, each partial block receives a clearance in the transverse direction which compensates the thermally caused transverse expansions of the individual blocks.

Abstract: In a laminated heat exchanger provided with tanks only on one side, which is constituted by laminating tube elements alternately with fins over a plurality of levels, a flange portion projecting out toward the fins is provided in each formed plate constituting the tube elements at an end portion on the opposite side from the tanks, and the flange portions facing opposite each other between the individual tube elements are made to face opposite each other over gaps. A notch is formed in each flange portion. For different types of formed plates, the notches are at positions shifted relative to one another in the direction of the width of the core main body along the direction of airflow. A notch may be formed at any position and be of any size in the flange portion.

Abstract: A heat exchanger, especially a condenser for an air conditioning system in a motor vehicle, includes a tubular header which comprises a tubular wall formed with aligned holes in which the ends of tubes of the heat exchanger are fixed. The header has a fastening lug. The tubular header has a longitudinal slot, and the fastening lug is part of a component which also includes a spine portion from which the fastening lug projects. This component is inserted into the slot and is then brazed to the tubular wall of the header.

Abstract: A heat exchanger is disclosed which has a collecting pipe having formed therein at least one slot whereby the slot lies in a plane roughly perpendicular to the collecting pipe longitudinal axis. A flat pipe, which is capable of accommodating a fluid, a partition, or the like can be inserted into the slot, the narrow sides of the slot being limited by parallel-running slot walls of the collecting pipe which extend roughly along a tangent to a circle around the pipe longitudinal axis. The slot length, determined by the spacing between the slot walls, corresponds at least to the pipe inner diameter. A method of making a slot in a collecting pipe also is disclosed whereby in order to produce the smallest possible pipe diameter and high compressive strength, a stable and seal-tight connection of a laterally issuing structural part is ensured.

Abstract: A core plates forming a core body includes an upstream refrigerant passage for communicating an upper and a lower tank disposed at a downstream side and a downstream refrigerant passage for communicating an upper and a lower tanks disposed at an upstream side with respect to the air flow direction. Ribs are formed on an inner surface of the upstream refrigerant passage to agitate the refrigerant, and inner fins are provided on the inner surface of the downstream refrigerant passage which receives a refrigerant after passing through each the upstream refrigerant passage of each the core body.

Abstract: A refrigerant tube for use in heat exchangers comprises a flat aluminum tube having parallel refrigerant passages in its interior and comprising flat upper and lower walls and a plurality of reinforcing walls connected between the upper and lower walls, extending longitudinally of the tube and spaced apart from one another by a predetermined distance. The reinforcing walls are each formed with communication holes for causing the parallel refrigerant passages to communicate with one anther therethrough. The flat aluminum tube is prepared from upper and lower two aluminum sheets by bending opposite side edges of the lower aluminum sheet to a raised form and joining the bent edges to the respective side edges of the upper aluminum sheet which is flat so as to form a hollow portion. The reinforcing walls are formed by joining to the inner surface of the upper wall ridges projecting inward from the lower wall.

Abstract: A header tank for a heat exchanger in the parallel flow type includes a plurality of tubes (2) and corrugated fins (3) stacked alternately, both ends of the stacked tubes are connected with the header tanks (4). Each header tank includes partition plates (12) therein. The header tank is formed by radially divided tow parts consisting of an end plate (7) and a tank plate (8). Pressing members (19) are provided on either the end plate or the tank plate for pressing one of the plate against the other plate for engagement therewith. The header tank is characterized in that end partition plates (13) are provided to the ends of the header tank, and the pressing members on one of the plates are located near the positions where the end partition plates are provided.

Abstract: A laminated type heat exchanger includes a plurality of refrigerant passages which are formed by pairs of core plates. Each core plate comprises an outer covering layer, a core layer, and an inner covering layer. The outer covering layer is made of a brazing material of which electric potential is more negative than the core layer while the inner covering layer is made of a brazing material of which electric potential is equal to or more positive than the core layer. The refrigerant passages are formed by brazing only the adjacent two of the inner covering layer. The outer covering layer works as a sacrificial corrosive material with respect to the inner covering layer and the core layer. Leakage of refrigerant from the brazed portions of the core plates is prevented, whereby the corrosion resistance of the laminated type heat exchanger is improved.

Abstract: A duplex heat exchanger of the so-called stacked type has in principle a plurality of plate-shaped tubular elements (1) which are stacked side by side or one on another and a plurality of fins (2) each intervening between the adjacent tubular elements. Each tubular element is composed of flat tubular segments (3a, 4a) separated from each other and each communicating with one of bulged header portions (3b, 4b) of the tubular element, so that flow paths (3, 4) for heat exchanging media are formed through each tubular element. Two or more unit heat exchangers (X, Y) are defined integral with each other within the duplex heat exchanger, since the adjacent tubular elements (1) communicate with each other through the header portions (3b, 4b).

Abstract: In a laminated heat exchanger having tube elements alternatingly laminated with fins, the plate thickness of an end plate is made smaller than the plate thickness of a formed plate constituting the tube element at the extreme end. Since the end plate becomes deformed more easily than the formed plate, even if pin holes are formed in the bonding area and condensed water becomes frozen in the pin holes, only the end plate will become distended, preventing deformation of the formed plate. Thus, even if pin holes are formed due to defective brazing in the bonding area of the formed plate which comprises the tube elements at the extreme end and the end plate, the tube element is prevented from becoming frozen and damaged, and the heat exchanging medium is prevented from leaking.

Abstract: A laminated-type evaporator for an automotive air conditioning refrigerant circuit includes a plurality of tube units having a pair of tray-shaped plates. Each of the tray-shaped plates includes a depression defined therein, a flange extending about the periphery thereof, and a wall disposed at an intermediate location therein and extending a portion of the length of each plate to thereby define a rear side and a front side to each plate. The wall includes a flat portion formed at an upper end thereof. A slit is formed at the flat, upper end portion of the wall by shearing. The slit extends along substantially the entire length of the wall along the wall's longitudinal axis.

Abstract: A heat exchanger for conducting a fluid comprises a plurality of heat transfer tubes, a plurality of fins sandwiched by the heat transfer tubes, and first and second header pipes fixedly and hermetically mounted to the heat transfer tubes. A pair of union joint devices are disposed in the first and second header pipes respectively. Each of the union joint devices comprises a brazed area wherein one end of a fluid passage disposed therein is brazed to a hole formed on the header pipe. A space is created around the brazed area for observing a condition of brazing and insuring a flux therein. Thereby, the heat exchanger has completely hermetic connections between the union joint and header pipes and is easily examined by an operator to detect any improper brazing between the union joint and the header pipes.

Abstract: According to the present invention, plural downstream side evaporation passages in a downstream side heat exchanging unit are divided into two groups substantially at the middle of the width by a separator, plural upstream side evaporation passages in an upstream side heat exchanging unit are divided into two groups substantially at the middle of the width by a separator, and a downstream side lower tank and an upstream side upper tank are communicated by a communication passage so that inefficient heat exchanging areas of the downstream side heat exchanging unit and the upstream side heat exchanging unit disposed one after the other with respect to the flowing direction of air may not overlap with each other.

Abstract: A heat exchanger has a header in the form of a stack consisting of pairs of shells, with the two shells of each pair being assembled together through their outer flanges, and with two adjacent shells, each belonging to a different pair, being joined together through annular inner flanges which are joined to the outer flanges of the shells through annular side walls. The outer flanges of the two shells of each pair, which define a housing for the end of an associated flattened fluid flow tube, also bear on the faces of a turbulator plate which projects out of the corresponding tube. The contact of the shells with the turbulator plate improves the rigidity of the header. The invention is applicable to the cooling of supercharging air in industrial vehicle engines.

Abstract: The invention provides a flat tube for a heat-exchanger conduit capable of being properly brazed and provides a sufficient heat-resistance, and a method of manufacturing it. A tube-stacking type heat exchanger comprising a plate made of an aluminum material including an aluminum alloy and which is cladded with a brazing material, wherein either a single plate is folded into two or two plates are placed one upon the other, the surface of one or both plates including projecting portion projecting from the surface of one plate to the surface of the other plate, the projecting portion is brought into pressure contact with the flat surface of the other plate or the projecting portion of the other plate, and the height of the end edge connecting portions of the plate is dimensioned smaller than the height of the projecting portion, to achieve the joining of the end edge connecting portions of the plate together.

Abstract: A clip for securing a manifold tube to an automotive heat exchanger has a portion which secures to a support plate of the heat exchanger without brazing. The base of the clip has a lip which inserts over an edge of the plate. A loop joins the base and extends around the tube. A leg joins the other end of the loop and has a lip which is inserted over an opposite edge of the plate. A fastener secures the first and second ends of the loop to each other to grip the tube and hold the lips in gripping engagement with the edges of the plate.

Abstract: A heat exchanger is disclosed having a plurality of stacked plate pairs with a core thickness of less than 25 mm. Each plate of a plate pair has asymmetrically arranged parallel ribs disposed at an oblique angle of less than 32 degrees to provide two point contact between the ribs on adjacent plate pairs.

Abstract: A highly efficient parallel flow evaporator is provided by combining a pair of identical units (10), (12) wherein each includes a pair of identical, parallel, spaced headers (40) each having slots (44) receiving the ends of identical flattened tubes (22). Identical tanks (42) are bonded to each of the headers (40) and each has an identical central flat surface (52) and an identical, centrally located port (60). Fins (26) extend between adjacent tubes (22) in each unit (10), (12) and an inlet/outlet fixture (32) is bonded to the flat surfaces (52) of one pair of tanks (42) defined by adjacent tanks (42) of both of the units (10),(12). A cross-over fixture (30) is bonded to the flat surfaces (52) of the other pair of tanks (42) defined by the remaining tanks (42) of both of the units (10),(12).

Abstract: A plate type evaporator core can be brazed in one step, even with long refrigerant feed pipes in place, and without the need for separate support fixtures or clips. This is done by stamping selected ones of the stamped plates that make up the core with integral feed pipe support flanges, located so as to coincide spatially with the desired final locations of the attachment end point of the feed pipes. The end points are supported on the flanges in the braze oven, and maintained in their proper locations regardless of any heat sagging of the rest of the feed pipe along its length.

Abstract: A refrigerant evaporator has, at each of a downstream side and an upstream side with respect to a flow direction of air, a pair of upper and lower tanks and a tube connecting the tanks. A refrigerant flows from the pair of tanks and the tube at the downstream side to the pair of tanks and the tube at the upstream side to cool the air flowing outside the tubes. The tanks at the upstream side are formed in an elliptic shape in cross section and the tanks at the downstream side are formed in a circular shape in cross section. The shorter diameter of the elliptic shape lies in a longitudinal direction of the tubes and is the same as the diameter of the circular shape.

Abstract: A refrigerant evaporator 5 constructed by a refrigerant-refrigerant heat exchanger section 32 having an inflow passageway 38 and an outflow passageway 39, and a refrigerant-air heat exchanger section 34 having a bottom tank 48, a top tank 49 and evaporating passageways 100 connecting the tanks 48 and 49 with each other. An orifice 33 is arranged between the inflow passageway 38 of the refrigerant-air heat exchanger section 34 and the inlet tank 48 of the refrigerant-air heat exchanger section 34. The refrigerant in the bottom tank 48 is introduced into all of the evaporating passageways 100, so as to obtain a single, upward direction of flow of the refrigerant in the evaporating passageways 100.

Abstract: According to the present invention, an outlet tank and an inlet tank are formed in one end side of a plurality of connecting bodies and the bent portions are formed in other end side of the connecting bodies. The plurality of the connecting bodies is formed by a pair of pressed plates and is laminated to form a predetermined space in which the fin is installed, thus creating a laminated type heat exchanger. The bent portions are formed in a bottom end portion of the connecting body, and in the remaining bottom end portion of the surface, there is formed an extending portion which extends to a side lower than the bottom end portion of the fin. Therefore, even when the condensed water becomes a water drop between the surface of the connecting body and the surface of the fin, the drop does not stay for a long time and is efficiently drained by the extending portion downwardly.

Abstract: A laminated heat exchanger in which tube elements and end plates can be bonded without forming gaps is provided while an end structure provides a sufficient flow passage area through the tube elements at the ends. An outside formed plate forming a tube element at one end of a laminated heat exchanger is formed flat and an end plate is bonded to the flat formed plate. The formed plate is provided with indentations and projections corresponding to those in the flat formed plate to which it is bonded face-to-face, and portions where the flat formed plate comes into contact with the end plate are formed flat or planar. The bonding margins of the end plate where it contacts the flat formed plate are formed so as to avoid areas which include indentations and projections in the flat formed plate. The end plate is formed so as to cover the entire surface of the flat formed plate.

Abstract: In a laminated heat exchanger, tube elements through which heat exchanging medium does not easily flow are eliminated by partitioning one of two tank groups extending in a direction of lamination approximately at the middle to divide it into a first communicating area 22 and a second communicating area 23. The first communicating area 22 communicates with an intake port 20 though which coolant flows in. The second communicating area 23 communicates with an outlet port 21 through which the coolant flows out. The number of tube elements constituting the first communicating area 22 is greater than the number of tube elements constituting the second communicating area 23. In this 4-pass system laminated heat exchanger, inconsistency in temperature distribution is minimized to achieve an improvement in heat exchanging performance.

Abstract: According to the present invention, the tube element includes a connecting portion for connecting the pair of core plates at an upstream air side, an extending portion extending from each of the connecting portions of the core plate at the upstream air side and having a fin connecting portion connected to the corrugated fin, and a further upstream end portion of the extending portion located at an upstream side of the fin connecting portion which is located away from the corrugated fin to form a predetermined gap with the corrugated fin so as to communicate with the air passage. The extending portion including the fin connecting portion closes the whole space between the tube elements and the adjacent corrugated fins at the more upstream air side of the refrigerant passage, so that the air entering between the tube elements and the adjacent corrugated fins can be substantially shut off.

Abstract: In order to prevent damage to the tube elements or the communicating pipe due to water collecting in a gap formed between the tube elements and the communicating pipe by defective brazing in a laminated heat exchanger, in which the water thus collected will be frozen and melted repeatedly, a structure that ensures that no water is collected in such a gap is achieved by making either one or both of the indented portions of the two formed plates, which constitute the indented portion of each tube element, not in contact with the communicating pipe.

Abstract: The invention is a condenser for mounting in an automotive vehicle. The condenser has two headers which begin as flat sheets of metal that are formed into tubes with face-to-face flanges projecting somewhat radially and along the length of the header. At opposite sides of the flat sheets of metal two flanges are welded together in order to provide integral mounting brackets for the condenser. Fluid carrying tubes and separator plates are fitted into holes and slits, respectively, in the two metal plates in order to assemble the condenser. All parts are clad with a material having a low melting temperature so that all parts of the assembly may be welded together by placing it in an oven having a temperature which melts the cladding. The advantages of the invention are that the assembly is carried out on the outside of the header tube and no separate mounting brackets are necessarily required.

Abstract: In a laminated heat exchanger in which a heat exchanging medium flows into a specific tank portion via a communicating passage that is connected to a surface that is at a right angle to the direction of the lamination, a reinforced portion is formed in the tank portion that faces opposite the opening portion of communicating passage (communicating pipe). The reinforced portion minimizes the likelihood of a rupture at the shoal-like bead near the communicating passage, which is provided among shoal-like beads formed in an area where the tank portions change to a U-shaped passage portion.

Abstract: A heat exchange assembly including at least one plate, preferably made from profile board, having a plurality of channels therein for the flow of a heat exchange fluid in a first plane which may be flat or curved and at least one inlet and outlet angled up to 90.degree. with respect to the first plane.

Abstract: A refrigerant tube for use in heat exchangers comprises a flat aluminum tube having parallel refrigerant passages in its interior and comprising flat upper and lower walls and a plurality of reinforcing walls connected between the upper and lower walls, extending longitudinally of the tube and spaced apart from one another by a predetermined distance. The reinforcing walls are each formed with communication holes for causing the parallel refrigerant passages to communicate with one anther therethrough. The flat aluminum tube is prepared from upper and lower two aluminum sheets by bending opposite side edges of the lower aluminum sheet to a raised form and joining the bent edges to the respective side edges of the upper aluminum sheet which is flat so as to form a hollow portion. The reinforcing walls are formed by joining to the inner surface of the upper wall ridges projecting inward from the lower wall.

Abstract: A heat exchanger comprises a bundle of tubes mounted between two fluid headers, each of which comprises a stack of shell members fitted together in pairs. Each shell member has a closed side wall which is joined to a flat outer flange and a flat inner flange. The inner flange defines an axial aperture, while the side wall of each shell member defines a lateral aperture having a cross section matching one half of the transverse cross section of a tube of the bundle. The shell members are assembled in pairs so as to define an internal chamber extending over the whole height of the stack, with each tube end being received in an aperture consisting of the two side apertures, joined together, of two adjacent shell members. The heat exchanger of the invention is applicable for example to the cooling of a high temperature air stream from a vehicle turbo charger.

Abstract: A flat plate type heat exchanger or evaporator is disclosed for use in automobile air conditioning systems. The heat exchanger includes a set of stacked plate pairs having refrigerant fluid passageways extending laterally between the plates of each plate pair while the spaces between the plate pairs define air flow passageways having fins located therein. In one aspect, fluid inlet and outlet passages are formed when differently sized tubes in adjacent plate pairs are telescoped together and subsequently brazed together to form a high surface area, fluid tight joint. The resulting fluid tight joint formed between tubes in adjacent plate pairs exhibits greater rupture resistance than that formed with drawn cup assemblies currently in use. These refrigerant fluid inlet and outlet passageways are spaced inwardly from the edges of the evaporator and extend transversely through the stack, the inlet and outlet passages being in communication with the fluid passageways.

Abstract: A clamper (12) has a clamp finger (12a) for gripping a joint pipe (5), and is preliminarily attached to a preassembly of a heat exchanger. The clamp finger (12a) is deformed to embrace the joint pipe (5), before the preassembly is subjected to the so-called one-shot brazing process. Thereafter, the joint pipe (5) is brazed to and become integral with the clamp finger (12a) which is embracing the joint pipe, at the same time as the essential parts incorporated in the heat exchanger preassembly are brazed one to another. Thus, the clamper (12) not only serves as a supporter for keeping the joint pipe (5) in place after the brazing, but also functions as a jig of such a kind as holding in place the joint pipe (5) in the unbrazed assembly of the heat exchanger, thus improving the manufacture efficiency of heat exchangers.

Abstract: A laminated type evaporator for an automotive air conditioning refrigerant circuit includes a plurality of tube units having a pair of tray-shaped plates. Each tray shaped plate includes a shallow depression defined therein, a flange extending about the periphery thereof, and wall disposed at an intermediate location therein and extending a portion of the length of each plate to thereby define a left side and a right side to each plate. A first plate in the pair includes a plurality of projections formed in its shallow depression. The second plate in the pair includes a plurality of projections formed in its shallow depression. The plurality of projections in the first and second plates are engaged by, e.g., inserting one into the other, so that the plates are secured against lateral and radial relative movement.

Abstract: In order to achieve reduced production costs in an expansion valve mounting member used for mounting an expansion valve on a heat exchanger and an improvement in its suitability for mass production, the expansion valve mounting member has a pair of tubular members, each of which is formed as a pipe, with one end of the pair connecting with a pair of coolant intake/outlet portions provided parallel to each other in the heat exchanger and the other end connecting with the expansion valve. A collar is provided at a specific position on the external circumferential side surface of each tubular member. A plate member is provided with a pair of holes into which the pair of tubular members are inserted. When the tubular members are fitted into the holes of the plate member, the collars come in contact with the circumferential edges of the holes to establish positioning.

Abstract: In a laminated heat exchanger constituted by laminating tube elements. Each tube element is constituted by bonding two formed plates together to form a U-shaped flow passage interconnecting a pair of tank portions at one end. A plurality of shoal-like beads are formed in an area extending from the tank portions to the U-shaped passage portion. The bonding width of the shoal-like bead formed in the central area is greater than the bonding widths of the shoal-like beads formed on opposite sides. This improves the bonding strength in the central area where the tank portions change into the U-shaped passage portion to prevent rupture caused by high pressure fluid in the area. The strength of the area that is most likely to rupture in the area where the tank portions change into the U-shaped passage portion is increased.

Abstract: A heat exchanger for an automobile air conditioning system and a method for manufacture of the same. The heat exchanger a plurality of refrigerant flowing tubes, a plurality of corrugated fins sandwiched between the tubes and a pair of header pipes liquid-tightly brazed and jointed to the opposite ends of the tubes respectively. Each of the header pipes is a hollow solid body produced by an extrusion of an aluminum material and having a flat section and a rounded section. The flat section includes a plurality of apertures for receiving the tubes and is thicker than the rounded section. Top and bottom support beams are not only brazed to the outermost corrugated fins but also jointed at their opposite ends to the flat sections of the header pipes. A plurality of brazing beads braze and liquid-tightly joint the opposite ends of the tubes to the first and second header pipes.

Abstract: A heat exchanger, particularly a refrigerant evaporator, is disclosed which comprises a soldered block of stamped plates which, in pairs, form a U-shaped guide and collecting ducts for a heat exchange medium. Corrugated ribs are arranged between the plate pairs, and plate-shaped lateral parts are arranged on the front ends of the block with the insertion of corrugated ribs. It is provided that, in the area of the collecting ducts, the lateral parts are provided with at least one profiling which, together with a covering sheet closing off the last plate, forms a chamber which has a connection to at least one of the collecting ducts.

Abstract: In a laminated heat exchanger constituted by laminating tube elements. Each tube element is constituted by bonding two formed plates together to form a U-shaped flow passage interconnecting a pair of tank portions at one end. A plurality of shoal-like beads are formed in an area extending from the tank portions to the U-shaped passage portion. The bonding width of the shoal-like bead formed in the central area is greater than the bonding widths of the shoal-like beads formed on opposite sides. This improves the bonding strength in the central area where the tank portions change into the U-shaped passage portion to prevent rupture caused by high pressure fluid in the area. The strength of the area that is most likely to rupture in the area where the tank portions change into the U-shaped passage portion is increased.

Abstract: A plurality of tube elements, each of which is provided with a pair of tanks on one side with these tanks communicating via a heat exchanging medium passage, are laminated. An intake/outlet tank group with intake/outlet portions is divided into three tank sub groups while a non intake/outlet tank group is not partitioned, constituting a single tank group. The intake/outlet portion on the intake side is directly connected with the tank sub group at one end in the intake/outlet tank group and at the same time, it communicates with the tank sub group at the other end via a relay pipe. Consequently, the coolant that has flowed in through the intake/outlet portion is induced to the non intake/outlet tank group from the tank sub group at one end via a heat exchanging medium passage and it is also induced to the non intake/outlet tank group from the tank sub group at the other end via the heat exchanging medium passage before the two flows are joined at the center.

Abstract: A plurality of tube elements, each of which is provided with a pair of tanks on one side with these tanks communicating via a heat exchanging medium passage, are laminated. An intake/outlet tank group with intake/outlet portions is divided into three tank sub groups while a non intake/outlet tank group is not partitioned, constituting a single tank group. The intake/outlet portion on the intake side is directly connected with the tank sub group at one end in the intake/outlet tank group and at the same time, it communicates with the tank sub group at the other end via a relay pipe. Consequently, the coolant that has flowed in through the intake/outlet portion is induced to the non intake/outlet tank group from the tank sub group at one end via a heat exchanging medium passage and it is also induced to the non intake/outlet tank group from the tank sub group at the other end via the heat exchanging medium passage before the two flows are joined at the center.

Abstract: A plurality of tube elements, each of which is provided with a pair of tanks on one side with these tanks communicating via a heat exchanging medium passage, are laminated. An intake/outlet tank group with intake/outlet portions is divided into three tank sub groups while a non intake/outlet tank group is not partitioned, constituting a single tank group. The intake/outlet portion on the intake side is directly connected with the tank sub group at one end in the intake/outlet tank group and at the same time, it communicates with the tank sub group at the other end via a relay pipe. Consequently, the coolant that has flowed in through the intake/outlet portion is induced to the non intake/outlet tank group from the tank sub group at one end via a heat exchanging medium passage and it is also induced to the non intake/outlet tank group from the tank sub group at the other end via the heat exchanging medium passage before the two flows are joined at the center.

Abstract: An end plate of a tank whose inside is partitioned by a partition has a plurality of insertion holes receiving connecting portions of tube elements. In the end plate, a first projection is distended and formed so as to run through narrow middle portions of the insertion holes, and a fit groove for the partition is formed on the inside of the first projection. Even when a core of the heat exchanger is put sideways on a furnace in a heat brazing method, brazing filler material can easily flow into the gaps between the insertion holes and the tube elements inserted into the insertion holes. As a result, good brazing can be performed.

Abstract: A condenser apparatus includes a pair of headers provided in parallel with each other; a plurality of tubular elements whose opposite ends are connected to the headers; and fins provided in the air paths between one tube and the next. Each of the headers is made of a cylindrical pipe of aluminum. At least one of the headers is internally divided by a partition into at least two groups of coolant passageways, thus enabling the flow of coolant to make at least one U-turn in the header. The partition extends into the header through a slit in the header. Each of the tubular elements is made of a flat hollow tube of aluminum. The opposite ends of the tubular elements are inserted into slits produced in the headers so that they are liquid-tightly secured.