Patent ID: 7779868

Claim:
A duct structure, comprising: a vessel forming therein a chamber, the vessel including: an inlet port, an outlet port, wherein the vessel is configured such that a fluid flows into the chamber through the inlet port and flows out of the chamber through the outlet port, and a swirling flow suppressing member disposed in a position inside the chamber adjacent to the outlet port, wherein the swirling flow suppressing member is configured to suppress a swirling flow from occurring to or adjacent to the outlet port, wherein the chamber includes: a main flow channel, and a sub-flow channel disposed substantially parallel to the main flow channel in such a configuration as to communicate with the main flow channel, and smaller than the main flow channel in cross section, the outlet port is configured to communicate with the main flow channel and the sub-flow channel, and the swirling flow suppressing member is disposed on a sub-flow channel side.