EP 1478467 A1 20041124 - ACOUSTIC SENSOR FOR OBSTRUCTION IN A DEVICE CIRCULATING VORTEX-FLOW FLUID
Title (en)
ACOUSTIC SENSOR FOR OBSTRUCTION IN A DEVICE CIRCULATING VORTEX-FLOW FLUID
Title (de)
AKUSTISCHER VERSTOPFUNGSDETEKTOR IN EINER FLÜSSIGKEITSDURCHFLUSSWIRBELVORRICHTUNG
Title (fr)
DETECTEUR ACOUSTIQUE D'OBSTRUCTION DANS UN DISPOSITIF D'ECOULEMENT DE FLUIDE PAR VORTEX
Publication
Application
Priority
CA 0200233 W 20020225
Abstract (en)
[origin: WO03070377A1] The invention concerns an acoustic sensor (44) for identifying obstruction of a circular grit trap for recycling fine sand in an industrial water clarifying plant. The circular grit trap comprises a cylindrical body having an outer wall and having at one first end a first sand-containing fluid inlet for receiving sludge and fine sand and a first overflow outlet of fluid not containing sand orthogonal to the fluid inlet, to evacuate said sludge, and at a second end a second sand-containing fluid underflow outlet coaxial with the first fluid outlet, to recover said sand. The acoustic sensor is sensitive to the noise radiated by the flow of the sand-containing fluid in the circular grit trap and is applied against the outer wall of the cylindrical body of the circular grit trap, in the plane of the fluid inlet but not coaxially therewith. Said acoustic sensor transmits a warning signal when an abnormal amplitude variation of sound level is measured in the bands of 1/3 octave centered on frequencies of 25 Hz or 200 Hz.
IPC 1-7
IPC 8 full level
B01D 21/00 (2006.01); B04C 11/00 (2006.01); G01F 1/66 (2006.01); G01N 29/04 (2006.01); G01N 29/22 (2006.01); G01N 29/42 (2006.01)
CPC (source: EP US)
B01D 21/0045 (2013.01 - EP US); B01D 21/0057 (2013.01 - EP US); B01D 21/2488 (2013.01 - EP US); B01D 21/267 (2013.01 - EP US); B01D 21/30 (2013.01 - EP US); B01D 21/302 (2013.01 - EP US); B01D 21/34 (2013.01 - EP US); B04C 11/00 (2013.01 - EP US); G01F 1/666 (2013.01 - EP US); G01N 29/046 (2013.01 - EP US); G01N 29/222 (2013.01 - EP US); G01N 29/42 (2013.01 - EP US); G01N 2291/02416 (2013.01 - EP US); G01N 2291/0258 (2013.01 - EP US); G01N 2291/02836 (2013.01 - EP US)
Citation (search report)
See references of WO 03070377A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 03070377 A1 20030828; AU 2002235688 A1 20030909; CA 2473046 A1 20030828; EP 1478467 A1 20041124; MX PA04008202 A 20041126; US 2005173354 A1 20050811
DOCDB simple family (application)
CA 0200233 W 20020225; AU 2002235688 A 20020225; CA 2473046 A 20020225; EP 02702192 A 20020225; MX PA04008202 A 20020225; US 50390305 A 20050322