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Flow meter

Imported: 24 Feb '17 | Published: 06 Jan '04

Joel David Bell

USPTO - Utility Patents

Abstract

A flow meter for measuring the volume of fluid flowing through the meter includes an inner cylindrical tube through which the fluid flows and an outer cylindrical tube tending over the inner cylindrical tube. The outer cylindrical tube is radially spaced from the cylindrical inner tube to provide an annular cylindrical space between the inner cylindrical tube and the outer cylindrical tube. A seal between said inner cylindrical tube and the outer cylindrical tube closes the annular cylindrical space adjacent ends of the annular cylindrical space. The inner cylindrical tube further defines at least one opening in a wall of the inner cylindrical tube to balance the fluid pressure in the annular cylindrical space with the pressure in the inner cylindrical tube. A flow restriction member is mounted to an inner surface of said inner cylindrical tube for restricting the flow of fluid through the inner cylindrical tube and produces a pressure drop in the fluid as it flows past the flow restriction member. The inner cylindrical tube and the outer cylindrical tube in combination further define at least one port for receiving a pressure sensing device to measure the pressure of the fluid flowing through said flow meter.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a prior art flow meter incorporating an internal wedge to restrict the fluid flow.

FIG. 2 is a cross-sectional view, shown along a horizontal center line of a fluid flow meter embodying the present invention.

FIG. 3 is a cross-sectional view of the circular area III of FIG. 2 taken at the location where the hollow core bolt interfaces with the calibrated tube.

FIG. 4 is a cross-sectional view of the calibrated tube taken along the horizontal center line.

Claims

1. A flow meter for measuring the volume of fluid flowing through the meter comprising:

2. The flow meter according to claim 1 wherein:

3. The flow meter according to claim 1 wherein said flow restriction device is a wedge.

4. The flow meter according to claim 3 wherein said wedge is detachable from said inner cylindrical tube.

5. The flow meter according to claim 4 wherein said wedge is positioned substantially centrally to said first and said second ends.

6. The flow meter according to claim 5 wherein said wedge includes at least one face oriented at an oblique angle to a longitudinal axis of said inner cylindrical tube.

7. The flow meter according to claim 6 wherein said face at least partially defines an apex to said wedge, said apex substantially lying within a plane perpendicular to said longitudinal axis.

8. The flow meter according to claim 7 wherein a height of said wedge is defined as the minimum distance from said apex to said inner surface of said inner cylindrical tube taken along a radial extending from said longitudinal axis to said inner surface and wherein a ratio of said height to a diameter of said inner surface is within the range of 0.2 to 0.5.

9. The flow meter according to claim 5 wherein said first port is positioned a predefined distance from said wedge as measured along a longitudinal axis of said inner cylindrical tube.

10. The flow meter according to claim 9 wherein said first port comprises:

11. The flow meter according to claim 10 wherein said inner cylindrical tube and said outer cylindrical tube in combination define at least two ports for receiving a pressure sensing device.

12. The flow meter according to claim 11 therein at least a first of said ports is positioned at an upstream area of said flow meter from said wedge, and at least a second of said ports is positioned at a downstream area of said flow meter.

13. The flow meter according to claim 12 wherein said first and said second ports are equally spaced along said longitudinal axis from said wedge.

14. A flow meter for measuring the volume of fluid flowing through a passageway, said meter comprising:

15. The flow meter according to claim 14 wherein:

16. The flow meter according to claim 15 wherein said metering structure is a wedge affixed to an inner wall of said second internal bore.

17. The flow meter according to claim 16 wherein said wedge is detachable from said inner wall.

18. The flow meter according to claim 17 wherein said wedge is positioned substantially centrally to said first and said second ends.

19. The flow meter according to claim 18 wherein said wedge includes at least one face oriented at an oblique angle to a longitudinal axis of said second bore.

20. The flow meter according to claim 19 wherein said face at least partially defines an apex to said wedge, said apex substantially lying within a plane perpendicular to said longitudinal axis.

21. The flow meter according to claim 20 wherein a height of said wedge is defined as the minimum distance from said apex to said inner wall of said second bore taken along a radial extending from said longitudinal axis to said inner wall, and wherein a ratio of said height to a diameter of said inner wall is within the range of 0.2 to 0.5.

22. The flow meter according to claim 18 wherein said first port is positioned a predefined distance from said wedge as measured along a longitudinal axis of said second bore.

23. The flow meter according to claim 22 wherein said first port comprises:

24. The flow meter according to claim 23 wherein said inner member and said outer housing in combination define at least two ports for receiving a pressure sensing device.

25. The flow meter according to claim 24 wherein at least a first of said ports is positioned at an upstream area of said flow meter from said wedge, and at least a second of said ports is positioned at a downstream area of said flow meter.

26. The flow meter according to claim 25 wherein said first and said second ports are equally spaced along said longitudinal axis from said wedge.

27. A method for measuring the flow of a fluid through a tube, said method comprising the steps of: