Patent ID: 7559256

Claim:
A flow rate measuring device in which a flow channel is formed, said flow channel comprising: a centrifugal chamber having a curved wall surface; a guiding flow channel allowing an external flow channel to communicate with one end of the wall surface of the centrifugal chamber from a tangential direction thereof; a discharge flow channel communicating with the other end of the wall surface of the centrifugal chamber from a tangential direction thereof; and a flow dividing channel communicating with the centrifugal chamber, generally perpendicular to a curved direction of the wall surface; wherein a detection element is placed on a downstream side of the flow dividing channel, a fluid that has been introduced into the centrifugal chamber from the external flow channel through the guiding flow channel is divided with the discharge flow channel and the flow dividing channel, and a flow rate of a fluid taken out from the flow dividing channel is measured by the detection element.