Patent ID: 7574908
Filing Date: 2009-08-18
Classification: G01F

Abstract:
1. A flow rate measuring device comprising: a primary flow pipe having a primary flow channel through which a fluid flows, an orifice provided in the primary flow channel and throttling a fluid flow, and a secondary flow channel block provided with a secondary flow channel, the secondary flow channel block being integrally provided on the primary flow pipe, one end of the secondary flow channel block communicating with a guide port provided on an upstream side of the orifice, and the other end of the secondary flow channel block communicating with a discharge pod provided on a downstream side of the orifice, wherein the secondary flow channel comprises: a guide flow channel in which an upstream side communicates with the guide port serving as a first bifurcation point, and a downstream side serves as a second bifurcation point; a first secondary flow channel in which an upstream side is bifurcated from the guide flow channel at the second bifurcation point and formed so as to be parallel to the primary flow channel, and a downstream side communicates with the discharge port; a second secondary flow channel in which an upstream side is bifurcated from the guide flow channel at the second bifurcation point and formed so as to cross the primary flow channel; and a detection flow channel in which an upstream side communicates with a downstream side of the second secondary flow channel, a flow rate detecting element is disposed, and a downstream side communicates with the discharge port.