To provide a double pipe heat exchanger suppressing the generation of vortex flow at the time of branching a secondary side fluid to contrive the improvement in durability.
In a double pipe heat exchanger that is provided with a primary circuit pipe 51 circulating a primary side fluid and a secondary circuit pipe 52 circulating a secondary side fluid and constituted in a double pipe structure having the primary circuit pipe 51 inside and the secondary circuit pipe 52 outside to provide heat exchange between the primary side fluid and the secondary side fluid, a branch connection part 55 for branching the secondary side fluid circulating through the secondary circuit pipe 52 is formed in the secondary circuit pipe 52, and the branch connection part 55 is constituted to be larger than the inside diameter at the other part of the secondary circuit pipe 52.
TANAKA NAOKI
SAKAMOTO SHUNICHI
TAKEDA MASAHIRO
AKASO TAKASHI
SAKAMOTO SEIKI KK
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