An electromagnetic flow meter for measuring flow rate of a fluid passing therethrough includes a conduit defining a fluid inlet, a fluid outlet and a measuring section positioned between the inlet and the outlet. The flow meter also includes a single coil for generating a magnetic field across the m
An electromagnetic flow meter for measuring flow rate of a fluid passing therethrough includes a conduit defining a fluid inlet, a fluid outlet and a measuring section positioned between the inlet and the outlet. The flow meter also includes a single coil for generating a magnetic field across the measuring section and electrodes for detecting induced electrical potential due to the fluid passage. The coil may be arranged to surround a section of the measuring section over a segment angle of between 140 and 180 degrees. The electrodes may be positioned so that they are offset from being opposite each other on the centerline of the measuring section, by an offset angle of between 5 degrees and 45 degrees.
대표청구항▼
That which is claimed: 1. An electromagnetic flow meter apparatus comprising: i) an inlet for receiving fluid flowing along a flow conduit, ii) an outlet in fluid communication with said inlet for outputting fluid that flows through the flow meter; iii) a measuring section positioned between, and i
That which is claimed: 1. An electromagnetic flow meter apparatus comprising: i) an inlet for receiving fluid flowing along a flow conduit, ii) an outlet in fluid communication with said inlet for outputting fluid that flows through the flow meter; iii) a measuring section positioned between, and in fluid communication with, said inlet and outlet; iv) a single coil positioned adjacent a portion of said measuring section for generating a magnetic field across said measuring section; and v) electrodes for sensing electric fields generated by fluid flowing through said magnetic field in said measuring section; wherein said single coil is positioned to surround a portion of said measuring section and wherein said electrodes are circumferentially offset from being diametrically opposite each other. 2. A flow meter according to claim 1, wherein said single coil is positioned to surround a segment of said measuring section to have an effective segment angle of between 120 degrees and 180 degrees. 3. A flow meter according to claim 2, wherein said measuring section has a width that is greater than 600 mm. 4. A flow meter according to claim 2, wherein said measuring section has a width of less than 65 mm and wherein said single coil is positioned to surround a segment of said measuring section to have an effective segment angle of between 160 degrees and 180 degrees. 5. A flow meter according to claim 2, wherein said measuring section has a width of between 65 mm and 600 mm and wherein said single coil is positioned to surround a segment of said measuring section to have an effective segment angle of between 140 degrees and 180 degrees. 6. A flow meter according to claim 2, wherein said single coil is positioned to surround a segment of said measuring section having a segment angle outside said range of angles and further comprising a pole piece that causes said coil to have similar magnetic characteristics to a coil that is positioned to surround a segment of said measuring section that has a segment angle within said range of angles. 7. A flow meter according to claim 6, where each electrode is offset from a centreline of the measuring section by a respective offset angle. 8. A flow meter according to claim 7, where each offset angle is between 5 degrees and 45 degrees, measured from the axis of the measuring section. 9. A flow meter according to claim 8, wherein said single coil is positioned to surround a segment of said measuring section and wherein each electrode is offset from the centre of the nearest coil bundle by an angle of between 20 degrees and 40 degrees. 10. A flow meter according to claim 1, wherein said coil extends along said measuring section over a distance of between 0.1 and 10 times the width of the measuring section. 11. A flow meter according to claim 1, wherein said electrodes are positioned at opposite sides of the measuring section. 12. A flow meter according to claim 1, wherein said electrodes have a 0.1 mm to 20 mm diameter and act as point electrodes. 13. A flow meter according to claim 1, wherein said electrodes are bar electrodes that extend over a section of the measuring section's wall. 14. A flow meter according to claim 1, wherein said measuring section has a circular cross-sectional shape. 15. A flow meter according to claim 1, wherein said measuring section has a non-circular cross-sectional shape. 16. A flow meter according to claim 1, wherein said measuring section has a width, in a direction transverse to a direction of fluid flow through the measuring section, that is greater than 600 mm. 17. A flow meter according to claim 1, wherein said single coil is a saddle shaped coil that extends along the length of the measuring section and that is positioned to surround a portion of the measuring section. 18. A flow meter according to claim 1, wherein said single coil comprises a bobin coil and a pole piece. 19. A flow meter according to claim 1, comprising a section of conduit and an elongate insert adapted for longitudinal insertion along and within said section of flow conduit, said insert comprising said inlet, outlet and said measuring section. 20. A flow meter according to claim 19 wherein said inlet has a restriction that is formed by a transition section between the inlet and measuring section, wherein the cross-sectional shape of the insert in a direction transverse to said flow path transforms smoothly from the shape of the inlet to the shape of the measuring section in the transition section. 21. A flow meter according to claim 19 wherein the cross-sectional area of the measuring section in a direction transverse to said flow path divided by the cross-sectional area of the flow conduit in a direction transverse to said flow path is less than 70%. 22. A flow meter according to claim 19 wherein the insert is manufactured substantially from a thermoset or a thermoplastic material. 23. A flow meter according to claim 19 wherein the insert comprises a detachable flange for retaining the insert in the flow conduit. 24. A flow meter according to claim 19 wherein the flow conduit comprises an outlet that extends away from the flow path for providing power to the coil and for allowing readings to be obtained from equipment within the flow conduit. 25. A flow meter according to claim 1, wherein said inlet comprises a restriction for conditioning the fluid flow through said measuring section. 26. A flow meter according to claim 1, wherein the electrodes are arranged, in use, to contact the fluid flowing through said measuring section. 27. A flow meter according to claim 1, wherein the electrodes are arranged, in use, to capacitively sense the electric field generated across said measuring section by said fluid flow. 28. A method of manufacturing a flow meter comprising: i) providing an inlet for receiving fluid flowing along a flow conduit; ii) providing an outlet in fluid communication with said inlet for outputting fluid that flows through the flow meter; iii) providing a measuring section positioned between, and in fluid communication with, said inlet and outlet; iv) providing a single coil and positioning the single coil adjacent said measuring section for generating a magnetic field across said measuring section; v) providing electrodes for sensing electric fields generated by fluid flow through said magnetic field in said measuring section; and wherein said positioning said single coil positions the single coil to surround a portion of said measuring section and wherein said providing electrodes provides electrodes that are circumferentially offset from being diametrically opposite each other. 29. A method according to claim 28, wherein said providing a single coil provides a single coil that is positioned to surround a segment of said measuring section to have an effective segment angle of between 120 degrees and 180 degrees. 30. A method according to claim 29, wherein said providing a measuring section provides a measuring section that has a width greater than 600 mm. 31. A method according to claim 29, wherein said providing a measuring section provides a measuring section that has a width that is less than 65 mm and wherein said providing a single coil provides a single coil that is positioned to surround a segment of said measuring section to have an effective segment angle of between 160 degrees and 180 degrees. 32. A method according to claim 29, wherein said providing a measuring section provides a measuring section that has a width of between 65 mm and 600 mm and wherein said providing a single coil provides a single coil that is positioned to surround a segment of said measuring section to have an effective segment angle of between 140 degrees and 180 degrees. 33. A method according to claim 29, wherein said providing a coil provides a single coil that is positioned to surround a segment of said measuring section having a segment angle outside the range of angles and further comprising a pole piece that causes said coil to have similar magnetic characteristics to a coil that is positioned to surround a segment of said measuring section that has a segment angle within the range of angles. 34. A method according to claim 28, wherein said providing a single coil provides a single coil that extends along said measuring section over a distance of between 0.1 and 10 times the width of the measuring section. 35. A method according to claim 28, wherein said providing said electrodes provides electrodes that are positioned at opposite sides of the measuring section. 36. A method according to claim 28, wherein said providing electrodes provides electrodes that are each offset from a centreline of the measuring section by a respective offset angle. 37. A method according to claim 36, wherein said providing said electrodes provides electrodes such that each offset angle is between 5 degrees and 45 degrees, measured from the axis of the measuring section. 38. A method according to claim 37, wherein said providing said electrodes provides electrodes that are offset from being diametrically opposite each other by an offset angle of approximately 10 degrees, measured from the axis of the measuring section, and wherein said single coil is positioned to surround a segment of said measuring section having a segment angle of approximately 150 degrees. 39. A method according to claim 37, wherein said providing a single coil provides a single coil that is positioned to surround a segment of said measuring section and said providing electrodes provides electrodes that are offset from the centre of the nearest coil bundle by between 20 degrees and 40 degrees. 40. A method according to claim 28, wherein said providing said electrodes provides electrodes that have a 0.1 mm to 20 mm diameter and act as point electrodes. 41. A method according to claim 28, wherein said providing said electrodes provides bar electrodes that extend over a section of the measuring section's wall. 42. A method according to claim 28, wherein said providing a measuring section provides a measuring section that has a circular cross-sectional shape. 43. A method according to claim 28, wherein said providing a measuring section provides a measuring section that has a non-circular cross-sectional shape. 44. A method according to claim 28, wherein said providing a coil provides a single saddle shaped coil that extends along the length of the measuring section and that is curved around an outer wall of the measuring section. 45. A method according to claim 28, wherein said providing a coil provides a single coil that is a bobbin coil wound on a pole piece. 46. A method according to claim 28, comprising providing a section of conduit and an elongate insert comprising said inlet, outlet and said measuring section, and longitudinally inserting said insert along and within said section of flow conduit. 47. A method according to claim 28, comprising providing an inlet that comprises a restriction for conditioning the fluid flow through said measuring section. 48. A method according to claim 28, wherein the cross-sectional area of the measuring section in a direction transverse to said flow path divided by the cross-sectional area of the flow conduit in a direction transverse to said flow path is less than 70%. 49. A method according to claim 28, wherein providing said electrodes provides electrodes that are arranged to contact the fluid flowing through said measuring section. 50. A method according to claim 28, wherein providing said electrodes provides electrodes that are arranged to capacitively sense the electric field generated across said measuring section by said fluid flow.
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이 특허에 인용된 특허 (20)
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