| 摘要 |
<p>A multitubular heat exchanger, in which tube-end plates (3), (3') are provided on both sides of a cylindrical bushing (1), a plurality of fluid outgoing-returning small tubes (2) are laid in the bushing (1) while supported by the tube-end plates (3), (3'), and fluids are poured into the bushing (1) and small tubes (2) to be subjected to heat exchange therebetween. More than one pair of small-tube insertion holes, each pair comprising holes into which the fluid outgoing-returning small tubes (2) are respectively fitted, are provided to both tube-end plates (3), (3'); lids (4), (4') are provided outside the tube-end plates (3), (3'), respectively; and U-turn fluid passages (9), each comprising holes in the shape of U and circular at cross-section to connect fluid outgoing-returning small tubes in every pair to each other are provided to both lids (4), (4'). the U-turn fluid passages (9) allow the fluids in the fluid outgoing-returning small tubes (2) to flow smoothly without stagnation on account of the gravity and makes velocity distribution in the fluid passages uniform. Cleanability after heat exchanging is increased.</p> |
