Abstract: Baffle inserts or shims are disclosed for controlling the flow circuiting in plate or tube type heat exchangers of the kind having a plurality of stacked, hollow plate pairs or tubes including mating end bosses or areas or spacers having communicating openings formed therein to form a manifold for the flow of fluid through the plate pairs. The baffle inserts are located between preselected adjacent end bosses in the area of the end bosses only, to define different flow circuits through the plate pairs or tubes without having to use specially shaped plates or inserting obstructions into the flow passages inside the plate pairs or tubes. A method of using the baffle inserts is disclosed in which the baffle inserts are inserted during preassembly of the heat exchanger prior to the brazing operation.

Abstract: A heat exchanger includes a first header and tank assembly having an inlet port and an outlet port. First and second tubes are included, each tube in fluid communication with the first header and tank assembly and with the other tube. An elastomeric baffle is disposed in the first header and tank assembly to substantially prevent fluid flow between the inlet port and the outlet port except through the first and second tubes.

Abstract: A laminated type heat exchanger according to the present invention includes a plurality of metal plates laminated with each other to form a fluid passage and an end plate disposed at an end of the laminated metal plates. The end plate has two protrusions for forming a fluid inlet passage and a fluid outlet passage for the fluid passage, respectively, and a joining portion formed between the two protrusions, for being brazed to the most-sided metal plate. A through hole is formed at the center of the joining portion. Even if there is a defective brazed portion in the joining portion, fluid which flows from the fluid inlet directly into the outlet passages through the defective brazed portion always leaks to the outside from the through hole. As a result, an internal leakage between the fluid inlet and outlet passages can be detected securely.

Abstract: In a heat exchanger which comprises by alternately laminating a plurality of tubes 2, 2 and fins 3, 3, communicatively connecting a header tank 4 to both ends of the laminated tubes, forming slits 11 at required points in the header tanks, and providing partition plates 9 in the slits to flow a heat-exchanging medium; recesses 12 are formed on the inner faces of the header tanks and near the slits where the partition plates 9 are positioned, and the partition plates 9 are provided with projections 15 to correspond with the recesses 12. Walls 4a, which are crushed when the partition plate 9 is inserted, are formed between the recess 12 and the slit 11.

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 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.

Abstract: A heat exchanger, in particular a heat exchanger for a motor vehicle, has a plurality of tubes, each of which comprises a press-formed metal blank rolled on itself to form a casing defining two parallel ducts for flow of a fluid in counterflow mode between them. The ducts are separated by a longitudinal bulkhead, and the tube has a first end portion and a second end portion. The first end portion is arranged for connection to a header having two compartments. The second end of each individual tube is closed so as to obturate the two ducts, and at least two communication apertures are formed in the bulkhead in the vicinity of the second end.

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 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 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: 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: The present invention is directed to a heat exchanger having a divided header tank. The heat exchanger has a pair of header tanks and a plurality of pipe members, by which the header tanks are placed in fluid communication. A partitioning plate is fixedly disposed within a hollow space of one of the header tanks, so that the hollow space is divided into two chamber sections. A gap is defined between the pair of header tanks corresponding to the partitioning plate. A blocking element is disposed within the gap, so that air which otherwise would pass through the gap is blocked, and the overall heat exchange operation of the heat exchanger is improved.

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: 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: 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: 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: An arrangement is disclosed for distributing and supplying and removing a coolant to and from a wall of a turbine engine, in particular a turbine dynamic jet engine, which is subjected to the flow of a hot fluid and has cooling channels which can be acted upon by the coolant and which are arranged substantially parallel to one another in the wall. The arrangement includes tube guides which are spatially separated from one another and connected to the wall, a casing of each tube guide having a longitudinal slot, each tube guide being attached on an inlet or outlet side to the respective cooling channels by way of the longitudinal slot and apertures in the wall, and a soldering or welded seam connecting the tube guides to the wall along the respective longitudinal slot.

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 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 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: 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: A system and method is provided whereby exhaust gases from a cold started internal combustion engine are rapidly brought to catalytic combustion conditions. Specifically, a closed system of a low pressure metal hydride heat exchanger and a high pressure metal hydride heat exchanger is provided which, upon engine ignition, effectuates hydrogen flow from the high pressure alloy exchanger to the low pressure alloy exchanger with rapid heating of the low pressure alloy due to hydrogen occlusion, and with the further provision that the heated low pressure hydride alloy exchanger is in heat exchange relationship with the cold started engine exhaust gases or the vehicle catalytic converter and provides heat necessary for initiation of catalytic combustion of pollutants in the said exhaust gases.

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: 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, 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: 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 automotive condenser (10) includes spaced manifold assemblies (18) comprised of semicylindrical tanks (20), matching semicylindrical headers (22) and simple, circular disks (38) serving as manifold separators. The disks (38) are sandwiched between the tank (20) and header (22) with no need for orientation, and with no slots or through notches to pierce the surface of the tank (20) or header (22). The disks (38) sit within matching pairs of common diameter grooves (30, 36) which provide complete, continuous pockets therefore.

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 cooling apparatus is provided comprising a vessel confining a pool of liquid. A plurality of separate tubular passageways are immersed in the liquid. A header assembly is provided having a first chamber and a second chamber. The first chamber is operatively connected to one end of each of the separate tubular passageways and the second chamber is operatively connected to the other end of each of the separate tubular passageways.

Abstract: A heat exchanger comprises a first tank and a second tank spaced vertically from the first tank. The first tank includes a first partition disposed therein to divide the first tank into a first number of chambers, wherein the first number of chambers is at least two and has respectively an inlet to allow the heat transfer medium to enter the heat exchanger and an outlet to allow the heat transfer medium to exit the heat exchanger. The second tank includes a second partition disposed therein to divide the second tank into a second number of chambers, wherein the second number of chambers is preferably one less than the first number of chambers. The first tank and the second tank respectively include a concave surface horizontally formed on walls of the tanks, wherein one end of each of the first and second partitions respectively insert into each of the concave surfaces for preventing overturn of the partitions during assembly of the tanks.

Abstract: The invention provides a heat exchanger mat, comprising a twin-duct manifold having a duct member comprised of an inlet duct and an outlet duct, a tube-socket member fixedly and fluid-tightly attached to the duct member, and a return manifold having a deflector member and a tube-socket member fixedly and fluid-tightly attached to one another. The mat also includes a plurality of tubes for circulation of a heat-exchanging liquid medium, each tube fixedly and fluid-tightly joined at one of its ends to the tube-socket member of the twin-duct manifold and at the other one of its ends to the tube-socket member of the return manifold. One end of each odd-numbered one of the tubes communicates via at least one aperture with one of the twin ducts, and one end of each even-numbered one of the tubes communicates via at least one other aperture with the other one of the twin ducts, and the other ends of all of the tubes communicate with the return manifold.

Abstract: A heat exchanger is provided with a first tank and a second tank. Heat transfer tubes are disposed between the tanks and are connected to the tanks to place the tanks in fluid communication. Either of the tanks may be divided into chambers by a partition. The partition has at least one portion which is oriented to be angularly offset from the direction of an air flow passing through the heat exchanger. The orientation of the partition permits the heat transfer tubes to be connected to the tanks in an arrangement so that no portion of the air flow can pass through the heat exchanger without striking at least one of the heat transfer tubes.

Abstract: A heat exchanger includes a pair of tanks spaced from each other and a plurality of parallel heat transfer tubes fluidly connected between the pair of tanks. Each tube has end portions inserted into holes disposed in the tanks. The end portions of each tube have a maximum diameter which is smaller than a central diameter of a central portion of the tube. At least one of the end portions comprises a straight portion having the maximum diameter and a tapered portion extending from the straight portion with a tapering diameter gradually decreasing from the maximum diameter. Manufacturing this heat exchanger is easier because the tubes are easily inserted into the holes of the tanks. Further, effective brazing between the tubes and the tanks may be achieved by the structure of the tube end portions having the straight portions and the tapered portions even if the length of the tubes vary slightly due to warping or improper manufacture.

Abstract: A heat exchanger is disclosed for automotive lubricants and coolants wherein the heat exchanger has a calibrated bypass orifice located therein to maintain the flow therethrough at all times, particularly during cold flow operation, or high pressure transient conditions such as at engine start-up. The heat exchanger has a housing defining a fluid inlet chamber and a fluid outlet chamber. A separator is located between the inlet and outlet chambers and heat exchange passages are located between and communicate with the inlet and outlet chambers. The separator has a calibrated bypass orifice therethrough for the continuous flow of fluid between the inlet and outlet chambers bypassing the heat exchange passages.

Abstract: A heat exchanger is provided with a first tank and a second tank. Heat transfer tubes are disposed between the tanks and are connected to the tanks to place the tanks in fluid communication. Either of the tanks may be divided into chambers by a partition. The partition has at least one portion which is oriented to be angularly offset from the direction of an air flow passing through the heat exchanger. The orientation of the partition permits the heat transfer tubes to be connected to the tanks in an arrangement so that no portion of the air flow can pass through the heat exchanger without striking at least one of the heat transfer tubes.

Abstract: With a fin width FW in the air-flow direction, fin thickness FT, fin pitch FP, fin height FH, and tube element height TW, dimensional relationships are 50 mm.ltoreq.FW.ltoreq.65 mm, 0.06 mm.ltoreq.FT.ltoreq.0.10 mm, 2.5 mm.ltoreq.FP.ltoreq.3.6 mm, 7.0 mm.ltoreq.FH 9.0 mm, and 2.0 mm.ltoreq.TW.ltoreq.2.7 mm. Provided are an optimum fin shape and tube element thickness in which a heat exchange efficiency and an air-flow resistance are well balanced, thereby ensuring an improvement in the heat exchange efficiency and the reduction in size of the heat exchanger.

Abstract: A laminate type heat exchanger is formed from a plurality of plates and integrally brazed and joined. This heat exchanger includes a joint block, a refrigerant heat-exchanging portion which causes heat exchange between refrigerants, and an evaporating portion which causes heat exchange between refrigerant and passenger-compartment air. The inventors formulated new index to perform successful integral brazing. A reference volume of a portion is a volume of the portion providing a predetermined amount of heat-receiving surface area of the portion,an index A of the portion is defined byA=(volume of material of the portion to be heated existing in a reference volume of the portion)/(the reference volume of the portion), and a ratio of an index A1 which is the index A of the first portion and an index A2 which is the index A of the second portion, i.e., A1/A2 is set within a certain range. Preferably, the certain range of the ratio of A1/A2 is defined by 1/2.2.ltoreq.A1/A2.ltoreq.2.2.

Abstract: An intake/outlet passage forming plate is provided with an entrance/exit section onto which an expansion valve is mounted. A first coolant passage communicates between one side of the intake/outlet section and one end of a coolant path and a second coolant passage that connects the other side of the intake/outlet section and the other end of the coolant path via a communicating pipe. With this structure, the shapes of the first and second coolant passages in the intake/outlet passage forming plate can be changed, making it possible to have the entrance/exit section, onto which the expansion valve is mounted, communicate freely with the outflow/inflow sides of the coolant path. Also, by providing a plurality of tanks to communicate between the communicating pipe and the tank groups at one end of the coolant path, and by changing the communicating positions, the heat exchanging capacity is improved.

Abstract: A laminated heat exchanger has a single tank structure and is of the type which does not have its fin holding portions in contact, but rather has them facing opposite each other over a specific gap. The structure of this heat exchanger ensures that the fins do not extend out of the gaps between the fin holding portions. The laminated heat exchanger has a single tank structure provided with tube elements constituted with tank portions formed by distending at one longitudinal end, and fin holding portions formed by bending at the other longitudinal end. Tanks are constituted on one side of the core by bonding adjacent tube elements. Each tube element of each adjacent pair of tube elements has a pair of fin holding portions facing opposite a pair of fin holding portions of the other tube element of the adjacent pair of tube elements over a specific gap. The distal ends of each pair of tube elements are non-aligned with one another, and thus, the gaps between opposing fin holding portions are non-aligned.

Abstract: A heat exchanger has flat tubes (1) parallelly arranged and spaced apart from each other a predetermined distance in the direction of thickness. The heat exchanger further has a pair of headers (5, 6) to which the ends of the tubes are connected in fluid communication. Each tube (1) has an intermediate bent portion (4) and straight sections (2, 3) separated one from another by the bent portion, and the bent portion (4) is a portion twisted at a predetermined helical angle relative to each straight section. Fins (11) are interposed between the adjacent straight sections (2), and further fins (12) between the other straight sections (3). The heat exchanger is easy to manufacture and of an improved efficiency of heat exchange, in spite of the tubes being bent in the direction of their width.

Abstract: The lack of flexibility in selecting locations for inlets or outlets or crossovers for a heat exchange fluid in a heat exchanger can be minimized in a heat exchanger construction including first and second spaced, generally parallel, tubular headers (10), (12) having opposed ends with a plurality of tubes (20) in parallel and spaced from one another which extend between and have their ends in fluid communication with the interior of the headers (10), (12). A plurality of fins (22) are located between the headers (10), (12) in heat exchange relation with the plurality of tubes (20) and side pieces, (30) and (32) flank the plurality of tubes (20) as well as the plurality of fins (22) and extend between and are fastened to corresponding ones of the headers (10), (12).

Abstract: A heat exchanger has tubes and headers, with each tube having both ends connected to the headers in fluid communication. A blockish joint of the flange connection type is attached to one header, and an inlet port and an outlet port are formed in the joint. One or two blockish connectors also of the flange connection type and fixed to ends of external pipings are connected to the joint, such that an effective core area of the heat exchanger is increased, and an operation for connecting the external pipings is rendered simpler and more efficient.

Abstract: Inefficiency in heat exchange in an evaporator for a refrigeration system due to maldistribution of incoming refrigerant may be reduced in a structure wherein a plurality of hydraulically parallel flow paths are defined by tubes (20) having ends (84) in the interior of a header (10). Refrigerant inlets (70, 72) are provided for the header (10) at opposite ends (62, 64) thereof to generate streams (78, 80) of incoming refrigerant which impinge upon one another to dissipate the kinetic energy and/or momentum of the streams (78 and 80) which in turn results in an improved distribution of the refrigerant within the header (10). Refrigerant outlets are provided for a header. The outlets are at opposite ends thereof to generate two streams of outgoing refrigerant which reduces outlet resistance and thus provides for more uniform flow of the refrigerant.

Abstract: A condenser adapted for use in the car cooling system, the condenser comprising a pair of headers provided in parallel with each other; a plurality of tubular elements whose opposite ends are connected to the headers; fins provided in the air paths between one tube and the next; wherein each of the headers is made of a cylindrical pipe of aluminum; wherein each of the tubular elements is made of a flat hollow tube of aluminum by extrusion; and wherein the opposite ends of the tubular elements are inserted into slits produced in the headers so that they are liquid-tightly soldered therein. The questions raised in reexamination request No. 90/003,919, filed Aug. 7, 1995, have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CFR 1.570(e).This is a Reissue of a Patent which was the subject of a Reexamination Certificate No. B1 5,190,100, dated Aug. 30, 1994, Request No. 90/003,073, Jun. 3, 1993.

Abstract: A condenser adapted for use in the car cooling system, the condenser comprising a pair of headers provided in parallel with each other; a plurality of tubular elements whose opposite ends are connected to the headers; fins provided in the air paths between one tube and the next; wherein each of the headers is made of a cylindrical pipe of aluminum; wherein each of the tubular elements is made of a flat hollow tube of aluminum by extrusion; and wherein the opposite ends of the tubular elements are inserted into slits produced in the headers so that they are liquid-tightly soldered therein.The question raised in reexamination request Nos. 90/003,544, filed Aug. 24, 1994, 90/003662, filed Dec. 16, 1994, 90/003796, filed Apr. 19, 1995, have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. as provided in 37 CFR 1.570(e).