Abstract: An evaporator consisting of stacked pockets wherein the refrigerating fluid is injected into an upstream connecting duct formed by a sub-assembly of the pockets by a longitudinal tubing which passes through an end face of the evaporator, distant from the upstream connecting duct, and at least another connecting duct formed by other pockets. According to the invention, the tubing is offset with respect to the centers of the openings through which the pockets forming the other connecting duct communicate between them. This results in an improvement in the heat exchange efficiency. The invention is applicable to the air conditioning of the passenger space of automobile vehicles.

Abstract: A heat exchanger for use as an evaporator in a motor vehicle air conditioning system comprises a multiplicity of plates stacked in pairs and defining within each pair a flow chamber for a first fluid. Between each pair of plates and the next is a flow passage for a second fluid. Each plate has a bent-back edge portion or plate foot which extends at right angles to the main part of the plate. Each plate foot abuts against a similar plate foot of an adjacent plate, while leaving an area free to define at least one drain passage through the bottom of the heat exchanger which is formed by the overlapping plate feet. Water condensing from the air passed through the evaporator is drained through these drain passages.

Abstract: In order to prevent a communicating pipe from becoming damaged by water (in particular drain water) collecting in the gap formed between the tube element at one end of a heat exchanger that is constituted of a flat plate and a formed plate and the communicating pipe through defective brazing and repeatedly freezing and melting, a flange (32) and a bonding margin (11) continuous to the flange (32) are notched off over almost the entire circumference at the center on the inside of an indented portion (9) in a formed plate (16) which, together with a flat plate (15), constitutes a tube element (3b). Thus, while the communicating pipe (27) comes in contact with the internal surface of a flange (29) of a pipe connection hole (28) of the flat plate (15), it does not come in contact with the formed plate (16), thereby forming a gap bounded by the flat plate (15), the formed plate (16) and the communicating pipe (27).

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 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 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 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: 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 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 structured with a plurality of tube elements laminated alternately with fins over a plurality of levels and end plates at either end in the direction of lamination. A passage plate, in which a supply passage and a discharge passage for heat exchanging medium are formed, is provided on the side of one of the end plates, and an intake pipe and an outlet pipe for heat exchanging medium are connected to the supply passage, and the discharge passage respectively, of the passage plate. The supply passage and the discharge passage of the passage plate have sufficient length, to allow the intake pipe and the outlet pipe to be connected at arbitrary positions. It is possible to connect the intake pipe and the outlet pipe for heat exchanging medium at arbitrary positions for different types of vehicles. Also, a heat exchanger in which commonality of components is achieved.