TURBINE FLOWMETER Russian patent published in 2002 - IPC

FIELD: geophysics, examination of gas-bearing wells. SUBSTANCE: invention refers to geophysical instruments for investigation of gas wells and measurement of flow rates in gas-bearing networks. Proposed turbine flowmeter has case with calibrated conduit where turbine and sensor connected to telemetering system and placed in groove of case are housed. Lower support of turbine in the form of thrust bearing and straightening apparatus in which upper support in the form of radial bearing are installed in calibrated conduit with downward direction of flow. Turbine is manufactured of non-magnetic moulding material, its end face part carries sprocket whose four arms are magnetic marks of four various levels of magnetization. Sensor is made up of two identical half cells which excitation semi- windings are connected in aiding and bifilar to signal semi-windings whose four levels of emf are forming specified sequence with period inversely proportional to flow rate with correct direction of rotation of turbine. EFFECT: increased accuracy and authenticity of measurement of low flow rates of liquids and gases provided by detection of contrarotation of turbine. 3 dwg