US 5,309,770 A · Fluid vibrating type flowmeter

Abstract

A fluid vibrating type flowmeter has a nozzle disposed in a flow passage and defining a nozzle outlet plane extending perpendicular to the flow passage, an enlarged passage disposed downstream of the nozzle and including divergent inner wall surfaces symmetric about an axis of the nozzle, a target disposed centrally of the enlarged passage for obstructing straight movement of streams jetting out of the nozzle, and a constructed passage disposed downstream of the enlarged passage and having a smaller passage width than a rear end of the enlarged passage. Each of the divergent inner wall surfaces includes a main arcuate section continuous from the nozzle outlet plane, a straight diverging wall section continuous from the main arcuate section, and an auxiliary arcuate section continuous at an upstream end thereof from the straight diverging wall section and at a downstream end thereof with the constricted passage. The straight diverging wall section is formed as a common tangent of the main arcuate section and auxiliary arcuate section. The main arcuate section has a radium R and the auxiliary arcuate section has a radius r, these radii being in relations expressed by ##EQU1## wherein L is a distance between the nozzle outlet plane and the center of the auxiliary arcuate section, and x is a distance between the center of the auxiliary arcuate section and a passage axis.

Claims6

Dependent claims

A fluid vibrating type flowmeter comprising:

a nozzle disposed in a flow passage and defining a nozzle outlet plane extending perpendicular to said flow passage;
an enlarged passage disposed downstream of said nozzle and including divergent inner wall surfaces symmetric about an axis of said nozzle;
a target disposed centrally of said enlarged passage for obstructing straight movement of streams jetting out of said nozzle;
and
a constricted passage disposed downstream of said enlarged passage and having a smaller passage width than a rear end of said enlarged passage;
wherein each of said divergent inner wall surfaces includes a main arcuate section continuous from said nozzle outlet plane and having a first radius R, a straight diverging wall section smoothly continuous from said main arcuate section, and an auxiliary arcuate section continuous at an upstream end thereof from said straight diverging wall section and at a downstream end thereof with said constricted passage, said auxiliary arcuate section having a second radius r,
said straight diverging wall section being formed as a common tangent of said main arcuate section and said auxiliary arcuate section, and
said first radius R and said second radius r are in relations expressed by ##EQU3## where L is a first distance in a passage direction of said nozzle outlet plane to the center of curvature of said auxiliary arcuate section, and x is a second distance transversely of said passage of the center of curvature of said auxiliary arcuate section to a passage axis.

5 more elements

A fluid vibrating type flowmeter comprising:

a nozzle disposed in a flow passage and defining a nozzle outlet plane extending perpendicular to said flow passage;
an enlarged passage disposed downstream of said nozzle and including divergent inner wall surfaces symmetric about an axis of said nozzle;
a target disposed centrally of said enlarged passage for obstructing straight movement of streams jetting out of said nozzle;
and
a constricted passage disposed downstream of said enlarged passage and having a smaller passage width than a rear end of said enlarged passage;
wherein each of said divergent inner wall surfaces includes a main arcuate section continuous from said nozzle outlet plane and having a first radius R, a straight diverging wall section smoothly continuous from said main arcuate section, and an auxiliary arcuate section continuous at an upstream end thereof from said straight diverging wall section and at a downstream end thereof with said constricted passage, said auxiliary arcuate section having a second radius r,
said auxiliary arcuate section and said constricted passage being interconnected through a discharge arcuate section converging toward said passage, and said passage being constricted at a position downstream of said target by said target and said discharge arcuate section, and
a minimum distance P1 between said target and said discharge arcuate section substantially corresponds to a distance T1 between said nozzle outlet plane and a front face of said target.

5 more elements

Dependencies are inferred from the claim text.

Fluid vibrating type flowmeter

Life of this patent

Fluid vibrating type flowmeter

Life of this patent

Abstract

Claims6