Turbine rate-of-flow transducer

• US 5,109,705 A
• Filed: 11/06/1990
• Issued: 05/05/1992
• Est. Priority Date: 03/13/1989
• Status: Expired due to Fees

• Current Assignee: Alexandr S. Aprakin, Robert G. Masyagutov, Viktor T. Drobakh
• Original Assignee: Alexandr S. Aprakin, Robert G. Masyagutov, Viktor T. Drobakh
• Inventors: Aprakin, Alexandr S., Drobakh, Viktor T., Masyagutov, Robert G.
• Primary Examiner(s): Goldstein, Herbert
• Application Number:
  US07/601,822
• Time in Patent Office: 546 Days
• Field of Search: 73/861.83, 73/861.89, 73/861.91, 73/861.92
• US Class Current: 73/861.83
• CPC Class Codes: G01F 1/10 using rotating vanes with axial admission

Abstract

The turbine rate-of-flow transducer incorporates a cylindrical body consecutively located wherein in the cocurrent direction there are a first flow straightener, a device for balancing an axial force of the flow, a rotor and a second flow straightener. The device for balancing the axial force of the flow is a truncated cone with passages spaced equidistantly apart all the way along the circumference of the side surface. Each passage is directed so that a projection of its longitudinal axis makes with a plane through an axis of revolution of the rotor an angle between 7° and 20°, the vertex whereof points towards the vertex of an angle inclined whereat are the vanes of the rotor. The aggregate cross-sectional area of the passages in the zone of the large base of the means of balancing amounts to 2-6% of the area of flow section at the inlet into the rotor. A pickup located in the body in the zone of the rotor generates a pulse each time a vane of the rotor passes.

Claims

1. A turbine rate-of-flow transducer comprising a cylindrical body in which there are consecutively located in a cocurrent direction a first flow straightener including a fairing facing an oncoming flow stream in a coaxial position relative to said cylindrical body and having radial fins attached to said body;

a means of balancing an axial force of said flow stream including a truncated cone, the small base of said truncated cone interacting with an end face of said fairing of said first flow straightener, and passages being made in a side surface of said truncated cone and being spaced equidistantly apart all the way along the circumference of said truncated cone;

a rotor having vanes and fitted for revolving in said cylindrical body and in a coaxial position with said cylindrical body;

a second flow straightener including a fairing located in a coaxial position relative too said body and having radial fins attached to said body, said fairings of said first and second straightener being located symmetrically with respect to an axis extending at right angles to an axis of revolution of said rotor, each of said passages of said truncated cone being directed so that a projection of a longitudinal axis of each said passages makes with a plane of an axis of revolution of said rotor an angle between 7° and

20° and

a vertex of said angle being pointed towards a vertex of an angle at which said vanes of said rotor are inclined, and an aggregate cross sectional area of said passages of said truncated cone in the area of a large base of said truncating cone being between 2 and 6% of the area of flow section at an inlet into said rotor; and

a pickup fitted to said cylindrical body in the zone of said rotor and generating a pulse each time a vanes of said rotor passes.

2. A turbine rate-of-flow transducer as in claim 1, wherein the leading edge of each vane of the rotor is formed by two planes making with each other an angle between 2/3 (90°

-γ

) and (90°

-γ

), where γ

is the angle which the rotor vanes make with the axis of revolution of the rotor.