Mass flow meter

An apparatus for measuring the mass flow of a fluid in a defined fluid stream or pipeline comprising:

• a conduit having an inlet end for receiving the flow from the fluid stream and an outlet end for returning the flow to the fluid stream, said inlet end and said outlet end positioned substantially along an axis defined by the defined fluid stream or pipeline, said conduit substantially free of restrictions or constraints for at least a portion of its length between the inlet end and the outlet end, said portion including a free floating continuous circular shaped loop, said loop lying substantially in a plane perpendicular to the axis with said axis passing through the center of the circle formed by said loop;
• a support beam positioned along said axis and passing through said loop, said support beam connected at respective opposite ends thereof adjacent said inlet end and said outlet end;
• a mounting bracket attached to said support beam at a position substantially in the plane of said loop, said bracket having a plurality of radially extending arms;
• at least one driving transducer mounted on one said arm and positioned adjacent to said loop said driving transducer imparting an oscillatory displacement to said loop, the displacement imparted in a direction substantially parallel to the axis line;
• and means for sensing the deflections of said loop due to the reaction of the flow against said loop in response to the oscillatory displacement, said means sensing said reaction without reference to a specific preset or fixed position of said loop, said sensing means mounted on said radially extending arms at positions adjacent the loop and displaced equidistant and in opposite directions from said driving transducer along the periphery of said loop.

An apparatus for measuring the mass flow within a pre-existing defined fluid stream, by measuring Coriolis reaction forces of the fluid on the apparatus, comprising:

• means defining a conduit having an inlet and an cutlet for receiving and exhausting flow from the fluid stream, said inlet and outlet positioned substantially in a straight line and each positioned along the defined fluid stream;
• a continuous flow tube including a substantially free floating loop formed between said inlet and said outlet, said loop being substantially symmeterical about and substantially free of restrictions or constraints along its periphery offset from said straight line and having a first and second gently bent portions, said first portion for directing the flow from said inlet into said loop, said second portion for directing the flow from said loop into said outlet;
• a support beam extending substantially along said straight line and attached at opposite ends to said conduit means adjacent to said inlet and said outlet;
• means for imparting an oscillation perpendicular to the flow at a point on said loop, means for sensing the movement of the loop due to the reaction of the fluid to said oscillation means, said sensing means positioned adjacent to the periphery of said loop and displaced equally and in opposite directions along said periphery from said oscillation means on said loop.

An apparatus for measuring the mas flow of a fluid stream comprising:

• a conduit having an inlet end and an outlet end positioned substantially along a single axis line and fixed with respect to one another;
• a substantially continuous flow tube spiraled about said axis line, said spiral of said flow tube having a loop of an arc of at least 270.degree. formed about said axis line, an inlet section for directing the flow into the loop from the inlet end of the conduit and an outlet section for directing the flow from the loop into the outlet end of the conduit, the flow tube being substantially free of restrictions or constraints along its continuous length so as to be substantially free-floating between said inlet and outlet ends;
• means to oscillate the flow tube transverse to the direction of flow within said loop;
• and means to sense the reaction of the flow on said free-floating flow tube in response to the imparted oscillation, said sensing means positioned on opposite sides of said oscillation.