Mass flow meter

Details Mass flow meter Mass flow meter

1985-04-16

1987-04-21

Woodiel, Donald O.

Measuring and testing

Volume or rate of flow

Mass flow by imparting angular or transverse momentum to the...

G01F 184

Patent

active

046586571

DESCRIPTION:

BRIEF SUMMARY
SUMMARY OF INVENTION

The invention relates to mass flow meter.
Known mass flow meters have been formed with a tubular loop of a U shape with parallel side arms clamped at one end to a loop mounting. A cross arm connects the side arms. The tubular loop is excited by a driving system into a primary oscillation which is a rotary oscillation about the axis of oscillation, and the axis of rotation and axis of oscillation coincide. It is an object of the invention to provide a mass flow meter of the type formed with the U shaped tubular loop as above discussed, which is capable of supplying significantly larger measuring signals than previously available with mass flow meters of this type, and permitting reliable measurement of significantly smaller flows. In the improved mass flow meter, the tubular loop and, with it, the part of the tubular loop, which is practically always present and corresponds to the cross arm of the known flow meters, is excited by the exciter system to a--primary--rotary oscillation about the axis of rotation. This primary, rotary oscillation, in conjunction with the mass flow rate, gives rise in said part of the tubular loop to Coriolis forces, which result in translatory deflection of this tubular loop part, which is proportional to the flow, displaced by 90.degree. relative to the exciting oscillation and superimposed on the primary rotary oscillation. The translatory deflection manifests itself as an oscillation of said tubular loop part about the axis of oscillation of the tubular loop, and the flexural resistance of the tubular loop about the axis of oscillation is significantly smaller than the flexural resistance about the axis of the secondary oscillation, exhibited by the tubular loop of the known flow meters. Thus, a significantly larger measuring signal is obtained than attained in flow meters having dimensions of the same order of magnitude permitting the use of thicker tubes for the same measuring range.


BRIEF DESCRIPTION OF DRAWINGS

The invention is explained in greater detail below by means of examples of the operation shown in the drawing.
FIG. 1 shows the mass flow meter in a simplified representation in perspective view for explaining the basic principle;
FIG. 2 shows, as a function of time, the course and the mutual phase position of the oscillations, executed by the side arms or the cross arm of the tubular loop of the flow meter of FIG. 1;
FIG. 3 is a first practical design of the inventive mass flow meter in schematic representation in perspective view;
FIG. 4 is a second practical design in schematic representation and perspective view.


DETAILED DESCRIPTION

The flow meter of FIG. 1 has a tubular loop 1, one side of which is clamped into a rigid loop mounting 2. The flow meter can be deflected elastically relative to the loop mounting 2 and transversely to its plane about an axis of oscillation SA that is defined by the clamping. The tubular loop 1 forms a half turn and comprises two side arms 1a and 1b, which extend at a spaced distance from each other from the loop mounting 2, and one cross arm 1c, which connects these at a distance from the mounting 2.
The tube mounting 2 is mounted, so that it can rotate about the axis of rotation DA, in a support 3 that, like the axis of rotation DA, lies in the plane of the tubular loop. The axis of rotation DA extends parallel to side arms 1a and 1b of tubular loop 1, forms an angle of about 90.degree. with the axis of oscillation SA and intersects cross arm 1c of tubular loop 1 essentially in the center.
The test medium, usually a fluid, is supplied to the tubular loop 1 at one clamped end and emerges from this loop at the other clamped end, as indicated by arrows 4 in FIG. 1. In so doing, it flows, in order, through side arm 1a, cross arm 1c and side arm 1b.
Immediately next to the loop mounting 2, which consists of a magnetic material here, there is arranged an electromagnetic exciter system 5, which displaces the loop mounting 2 and, by way of this, the tubular loop 1 into a primary rotary oscillation about the ax

REFERENCES:
patent: 3108475 (1963-10-01), Henderson
patent: 3132512 (1964-05-01), Roth
patent: 4252028 (1981-02-01), Smith et al.

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