Stationary coils for a coriolis effect mass flowmeter
First Claim
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1. In a Coriolis flowmeter having first and second flow tubes positioned substantially parallel to each other;
- means for vibrating said first and second flow tubes out of phase with respect to each other;
sensor means for detecting the movement of said flow tubes resulting from material flow through said vibrating flow tubes;
said sensor means comprising;
at least two magnets each of which is affixed to a corresponding portion of different ones of said flow tubes;
a coil proximate said magnets and having a substantially flat surface aligned substantially parallel to a plane defined by a surface of both of said magnets;
means for maintaining said coil in a substantially non-movable fixed position as said magnets vibrate out of phase with respect to each other;
said coil being responsive to the vibration of said magnets affixed to said vibrating flow tubes for generating a signal representing the relative movement of said vibrating flow tubes, said movement including the movement due to Coriolis forces generated by material flow within said flow vibrating flow tubes.
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Abstract
A Coriolis flowmeter having a pair of parallel vibrating flow tubes equipped with a driver and sensors each comprising a fixed non-movable coil and a pair of magnets affixed to the vibrating flow tubes. Each coil magnetically cooperates with a unique pair of magnets. In a first embodiment, the coil is affixed to a non-movable member of the flowmeter. In another embodiment, the non-movable coil is affixed only to a spring sub-assembly which is affixed to the flow tubes which vibrate out-of-phase with respect to each other.
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Citations
16 Claims
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1. In a Coriolis flowmeter having first and second flow tubes positioned substantially parallel to each other;
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means for vibrating said first and second flow tubes out of phase with respect to each other; sensor means for detecting the movement of said flow tubes resulting from material flow through said vibrating flow tubes; said sensor means comprising; at least two magnets each of which is affixed to a corresponding portion of different ones of said flow tubes; a coil proximate said magnets and having a substantially flat surface aligned substantially parallel to a plane defined by a surface of both of said magnets; means for maintaining said coil in a substantially non-movable fixed position as said magnets vibrate out of phase with respect to each other; said coil being responsive to the vibration of said magnets affixed to said vibrating flow tubes for generating a signal representing the relative movement of said vibrating flow tubes, said movement including the movement due to Coriolis forces generated by material flow within said flow vibrating flow tubes. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A Coriolis flowmeter having first and second flow tubes positioned substantially parallel to each other;
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each of said flow tubes having a substantially straight portion adjacent to and parallel to each other; means for vibrating said flow tubes out of phase with respect to each other; a first substantially flat printed circuit board positioned on one side of said substantially straight portion of each of said flow tubes; a second substantially flat printed circuit board positioned on the other side of said substantially straight portion of each of said flow tubes; a plurality of sensor coils each of which is positioned on a different end of a different one of said printed circuit boards; each of said flow tubes having a plurality of magnets affixed thereto with each magnet being positioned between the flow tube to which it is affixed and one of said sensor coils and wherein each of said sensor coils is operative to sense the magnetic field emanating from a different pair of said magnets affixed to different ones of said flow tubes; means for maintaining said printed circuit boards substantially fixed and non-movable as said magnets and flow tubes vibrate out of phase with respect to each other; said sensor coils being responsive to the movement of said magnets for generating signals representing the relative movement of said tubes with respect to each other as they vibrate out of phase with respect to each other while being twisted by Coriolis forces generated due to material flow within said vibrating flow tubes. - View Dependent Claims (8, 9)
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10. A method of operating a Coriolis flowmeter having first and second flow tubes positioned substantially parallel to each other;
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means for vibrating said first and second flow tubes out of phase with respect to each other; and sensor means for detecting the movement of said vibrating flow tubes resulting from material flow through said vibrating flow tubes; said method comprising the steps of; affixing each of a pair of magnets to a corresponding portion of different ones of said flow tubes; positioning a coil proximate said magnets with said coil having a substantially flat surface aligned substantially parallel to a plane defined by an end of both of said magnets; and maintaining said coil in a substantially non-movable fixed position as said magnets affixed to said vibrating flow tubes vibrate out of phase with respect to each other; said coil being responsive to said vibration of said magnets for generating a signal representing the relative movement of said vibrating flow tubes as they are twisted by Coriolis forces generated by material flow within said flow tubes. - View Dependent Claims (11, 12, 13)
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14. A method of operating a Coriolis flowmeter having first and second flow tubes positioned substantially parallel to each other;
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each of said flow tubes having a substantially straight portion adjacent the substantially straight portion of the other one of said flow tubes; and means for vibrating said flow tubes out of phase with respect to each other; said method comprising the steps of; positioning a first substantially flat printed circuit board on one side of said substantially straight portion of each of said flow tubes; positioning a second substantially flat printed circuit board on the other side of said substantially straight portion of each of said flow tubes; maintaining said printed circuit boards substantially fixed and non-movable as said magnets and flow tubes vibrate out of phase with respect to each other; positioning a different one of a plurality of sensor coils on a different end of a different one of each of said printed circuit boards; affixing a plurality of magnets to each of said flow tubes with each magnet being positioned between the flow tube to which it is attached and one of said coils wherein two of said magnets are positioned between each of said coils and said flow tubes; said sensor coils being responsive to the movement of said magnets for generating signals representing the relative movement of said tubes with respect to each other as they vibrate out of phase with respect to each other while being twisted by Coriolis forces generated due to material flow within said vibrating flow tubes. - View Dependent Claims (15, 16)
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Specification