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: 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: An evaporator for a refrigerant system having a heat exchanging section and a evaporating section of a total flow type having a bottom inlet tank for receiving a refrigerant from the heat exchanging section, a bottom outlet tank for a discharge of the refrigerant and a stack of flatten pipes, each defining a refrigerant passageway of U-shape connecting the bottom inlet tank and bottom outlet tank. The heat exchanging section controls the degree of the dryness of the refrigerant in a range between 0.01 to 0.2. The flattened pipe has an inner thickness in a direction of the stack in a range between 2.0 to 3.0 mm.

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: A laminate-type evaporator is disclosed which is formed of a main heat exchanger, an auxiliary heat exchanger, and a connecting member integrally brazed, such that brazing performance between the auxiliary heat exchanger and the connecting member is enhanced and moisture does not remain between the auxiliary heat exchanger and the connecting member, while setting brazing temperature to a temperature which does not melt the main heat exchanger and also while shortening brazing time. Convexities are formed on a block joint, and a width of a brazed portion connecting these convexities and an end plate is made to be 5 mm or less. Additionally, a dimension of a clearance between the end plate and block joint is made to be 0.5 mm or more.

Abstract: An amount of refrigerant fed to an evaporator 16 is adjusted by an open degree of an expansion valve 6 in accordance to a refrigerant pressure and a refrigerant temperature of an outlet side of the evaporator 16. The evaporator 16 has an evaporation part which includes a refrigerant passage 26 connecting parallel with an inflow passage 22 and an outflow passage 24 and further having a cooled passage 28 which forms a first throttle 30 at the downstream thereof and a cooling passage 32. The cooled passage 28 links the expansion valve 6 and the inflow passage 22. The cooling passage 32 is connected to the outflow passage 24 and leads refrigerant to an outlet. A heat exchange part 20 is provided to be able to of performing heat exchange between the cooled passage 28 and the cooling passage 32. A second throttle is set in a bypass passage 38 which links the upstream side of the cooled passage 28 and the downstream side of the first throttle 30.

Abstract: A refrigerant evaporator for a refrigeration cycle which separates a refrigerant of a two-phase gas and liquid state introduced from a pressure reduction means into a liquid refrigerant and a gas refrigerant by a gas and liquid separation means and distributes at least the liquid refrigerant to a plurality of refrigerant passageways of a heat exchange portion by a distribution means such as a tank. The distributed refrigerant has a single phase such as a liquid refrigerant and therefore the distribution is uniformly and equally carried out, the efficiency of the evaporator becomes higher, and the size can be reduced.

Abstract: A refrigerant evaporator for a refrigeration cycle provided with a heat exchanging unit, comprising a passageway to be cooled and a cooling passageway, and an evaporating unit for cooling the air, wherein a part of the inflowing refrigerant is divided, passed through a throttle to be reduced in pressure, and then passed through the cooling passageway of the heat exchanging unit, the inflowing refrigerant passing through the passageway to be cooled is cooled and completely changed to the liquid state and then passed into the evaporating unit, whereby the refrigerant is uniformly distributed to a plurality of refrigerant passageways of the evaporating unit.

Abstract: A evaporator for use in a refrigerating cycle in an air conditioning apparatus for a vehicle. The evaporator is provided with a heat exchanger and an evaporator. The heat exchanger has an inlet passageway for leading the refrigerant from the condenser to the evaporator, and an outlet passageway for leading the refrigerant from the evaporator to the compressor. A heat exchange between the inlet refrigerant and the outlet refrigerant at the heat exchanger part takes place, so that a combined gas-liquid state refrigerant is introduced into the outlet passageway of the heat exchanger from the evaporator, whereby a superheating state of the refrigerant is generated in the outlet passageway, and a result, no superheating action occurs in the evaporator, and thus the refrigerant in the evaporator is kept at a constant temperature, whereby the cooling efficiency of the evaporator is increased.

Abstract: A laminate-type heat exchanger having a plurality of component plates each having a flange and projection formed along the circumference thereof, raised portions and hollowed portions formed at both ends of an area surrounded by the projection and which define together reservoirs, respectively, and an intermediate wall formed in an area except for the raised and hollowed portions and which has a height equal to half of the flange and raised portions, the plates adjacent at one side being laminated one on another with one side of the plate set opposite to the same side of the adjacent one and brazed to each other at their respective flanges and hollowed portions while the plates adjacent at the other side being laminated one on another are brazed to each other at their respective projections and raised portions.

Abstract: A plate-type heat exchanger comprises a stack of flat tubes each composed of a pair of confronting core plates jointed to each other and defining a fluid passage. A cross sectional area of the fluid passage is increased along the flowing direction of tbe refrigerant. A plurality of ribs are disposed on the fluid passage. A flowing resistance of the ribs which are disposed near an outlet tank is lower than that of the ribs which are disposed near an inlet tank.

Abstract: A plate-type heat exchanger comprises a stack of flat tubes each composed of a pair of confronting core plates jointed to each other and defining a fluid passage. A cross sectional area of the fluid passage is increased along the flowing direction of the refrigerant. A plurality of ribs are disposed on the fluid passage. A flowing resistance of the ribs which are disposed near an outlet tank is lower than that of the ribs which are disposed near an inlet tank.

Abstract: An aluminum material for brazing, comprising a core made of aluminum or an aluminum alloy, and a layer coated on the surface of the core. The layer is made of zinc or an alloy of zinc-and-aluminum and a brazing alloy having a melting point which is lower than that of the core by a predetermined value. The zinc or the alloy of zinc-and-aluminum and the brazing alloy have different melting points. Also disclosed are a method of manufacturing an aluminum material for brazing and a method of manufacturing an aluminum alloy heat exchanger by use of the Al material for brazing.