Apparatus for developing differential pressures in a conduit line

Claim 1

APPARATUS FOR DEVELOPING DIFFERENTIAL PRESSURES AS A CONSEQUENCE OF MOVEMENT OF FLUID IN A CONFINED PATH COMPRISING, A SUBSTANTIALLY RIGID PIPE HAVING A GENERALLY CYLINDRICAL INNER SURFACE, A FIRST FRUSTO-CONICAL ELEMENT FORMED OF SHEET MATERIAL WITHIN SAID PIPE HAVING ITS LARGER END SECURED TO SAID PIPE AND SEALED WITH RESPECT TO THE INNER SURFACE THEREOF, SAID FIRST FRUSTO-CONICAL ELEMENT CONVERGING IN PROCEEDING DOWNSTREAM WITHIN THE PIPE, A SECOND FRUSTO-CONICAL ELEMENT FORMED OF SHEET MATERIAL WITH ITS SMALL DIAMETER END EQUALLING AND JOINING THE SMALL DIAMETER END OF THE FIRST FRUSTO-CONICAL ELEMENT WITH SAID SMALL DIAMETER ENDS PROVIDING A THROAT, SAID SECOND FRUSTO-CONICAL ELEMENT HAVING A SUBSTANTIALLY TRUE FRUSTOCONICAL INNER SURFACE DIVERGING IN PROCEEDING DOWNSTREAM FROM SAID THROAT SUBSTANTIALLY TO THE INNER SURFACE OF SAID PIPE, SAID FRUSTO-CONICAL ELEMENTS AND THE THROAT THEREBETWEEN PROVIDING SHEET MATERIAL ENERGY CONVERSION ASSEMBLY, INTERMEDIATE EXTERIOR SURFACES OF BOTH OF SAID FRUSTO-CONICAL ELEMENT SPACED FROM SAID PIPE PROVIDING AN ANNULAR AREA BETWEEN THE EXTERIOR OF THE FRUSTO-CONICAL ELEMENTS AND THE INTERIOR OF THE PIPE, THE DIAMETER OF THE DOWNSTREAM END OF SAID SECOND FRUSTO-CONICAL BEING LESS THAN THE INNER SURFACE OF SAID PIPE PROVIDING AN ANNULAR PASSAGE FOR COMMUNICATION BETWEEN SAID ANNULAR AREA AND THE INTERIOR OF THE PIPE, THE DOWNSTREAM END OF SAID SECOND FRUSTO-CONICAL ELEMENT BEING UNATTACHED TO SAID PIPE ALLOWING AXIAL EXPANSION AND CONTRACTION OF SHEET MATERIAL ENERGY CONVERSION ASSEMBLY LENGHTWISE WITH RESPECT TO THE PIPE, SAID SHEET MATERIAL ENERGY CONVERSION ASSEMBLY HAVING A PORT THROUGH THE SHEET MATERIAL AT THE THROAT FOR SENSING LOW PRESSURE, A TUBE EXTENDING THROUGH THE FIRST FRUSTO-CONICAL ELEMENT UPSTREAM OF SAID THROAT ADJACENT THERETO, SAID TUBE HAVING AN IMPACT PORT THEREIN INSIDE THE FIRST FRUSTO-CONICAL ELEMENT FACING UPSTREAM OF THE ASSEMBLY FOR SAMPLING THE SUM OF THE STATIC PRESSURE HEAD AT APPROACH TO THE THROAT PLUS THE VELOCITY HEAD RESULTING FROM ACCELERATION AT THE APPROACH TO THE THROAT, AND THE INNER END OF SAID TUBE BEING POSITIONED OUTSIDE THE DIAMETER OF SAID THROAT.