Patent ID: 7549466

Claim:
An evaporator constituted by a heat exchanger arrangement comprising: an upper tank having an inflow port through which coolant enters said upper tank to flow in said upper tank along an upper tank lengthwise direction; a plurality of tubes including a tube group having an upper end portion communicating with said upper tank, said plurality of tubes being configured to distribute the coolant along an up/down direction; a heat-exchanger side intake/outlet connector, provided at said inflow port of said upper tank, for use in connecting to an intake pipe-side connector; and a coolant intake guide passage provided at least partly in said upper tank at said inflow port; wherein said coolant intake guide passage includes a flow passage portion configured to receive coolant flowing in the upper tank lengthwise direction from said inflow port and to allow flow of the coolant along the flow passage portion; wherein said flow passage portion of said coolant intake guide passage is formed as a trough having an open top; wherein said flow passage portion of said coolant intake guide passage extends, along a lengthwise direction of said upper tank, to a middle portion thereof; wherein said inflow port includes a circular hole portion and an elongated hole portion connected to said circular hole portion, said elongated hole portion having a substantially rectangular cross section; wherein said flow passage portion of said coolant intake guide passage is inserted through said elongated hole portion of said inflow port; wherein said elongated hole portion of said inflow port is disposed on a downstream side of said circular hole portion; wherein said trough of said flow passage portion of said coolant intake guide passage includes a bottom surface with two upright side walls projecting upwardly from two sides thereof and extending along a lengthwise direction thereof, said trough being configured so that coolant flowing therealong can overflow over said upright side walls at high coolant flow rates; wherein said coolant intake guide passage is mounted to said heat-exchanger side intake/outlet connector; and wherein said coolant intake guide passage includes an intake pipe-side connector insertion portion for receiving an intake pipe-side connector, and a clamped portion to be clamped between said intake pipe-side connector insertion portion and the intake pipe-side connector, said clamped portion being constituted by a collar larger in diameter than said intake pipe-side connector insertion portion.