Magnetic flow meter with unibody construction and conductive polymer electrodes
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01F-001/58
G01F-001/56
출원번호
US-0052005
(2005-02-04)
발명자
/ 주소
Wehrs,David L.
Chinnock,Robert T.
출원인 / 주소
Entegris, Inc.
대리인 / 주소
Patterson, Thuente, Skaar & Christensen, P.A.
인용정보
피인용 횟수 :
7인용 특허 :
17
초록▼
A magnetic flow metering device and method is disclosed for the measurement of corrosive flow streams. The device utilizes a unibody construction wherein the flow conduit is constructed entirely from an insulative, non-conducting material without resorting to a metallic outer housing. The portions o
A magnetic flow metering device and method is disclosed for the measurement of corrosive flow streams. The device utilizes a unibody construction wherein the flow conduit is constructed entirely from an insulative, non-conducting material without resorting to a metallic outer housing. The portions of the electrodes in contact with the flow stream are made of a suitable conductive polymer material, resistant to the corrosive media. The electrodes also feature shields that are molded into the electrode assembly to reduce background electrical noise. The invention also utilizes an electrical configuration that actively drives the electrode shield circuit (electrodes as well as cabling) to provide a more accurate measurement of the electromotive force.
대표청구항▼
What is claimed is: 1. A magnetic flow meter comprising: a housing having a conduit formed therethrough, said conduit having an axis of flow; a pair of magnetic poles disposed on either side of said conduit in a diametrically opposed relationship, said pair of magnetic poles being located on and in
What is claimed is: 1. A magnetic flow meter comprising: a housing having a conduit formed therethrough, said conduit having an axis of flow; a pair of magnetic poles disposed on either side of said conduit in a diametrically opposed relationship, said pair of magnetic poles being located on and in alignment with a first lateral axis that substantially intersects said axis of flow; a pair of electrically shielded electrodes disposed on either side of said conduit in a diametrically opposed relationship, said electrodes being in fluid communication with said conduit and defining a second lateral axis that substantially intersects both said first lateral axis and said axis of flow; wherein each of said shielded electrodes has a longitudinal axis and is comprised of a central conductive member, an annular conductive member, and a shield member made from at least one electrically conductive material and arranged in a substantially concentric manner with said central conductive member located on said longitudinal axis and said annular member being located between said central conductive member and said shield member; said central conductive member and said annular conductive member separated by a first interstitial insulative member; and said central conductive member and said annular conductive member adapted to be coupled to a signal amplifier, said shield member adapted to be coupled to an electrical ground. 2. The magnetic flow meter of claim 1 wherein: said signal amplifier comprises an amplifier having an inverting input, a non-inverting input, and an output; said central conductive sensing member and said annular conductive member connected to said inverting input and said non-inverting input of said amplifier, respectively; and said inverting input electrically connected to said amplifier output. 3. The magnetic flow meter of claim 2, wherein said central conductive member and said annular conductive member are comprised of a conductive plastic. 4. A magnetic flow meter comprising: a housing having a conduit with an axis of flow; a pair of magnetic poles disposed on either side of said conduit in a diametrically opposed relationship, said pair of magnetic poles aligned with a first lateral axis that substantially intersects said axis of flow; a pair of electrodes disposed on either side of said conduit in a diametrically opposed relationship, said electrodes aligned with a second lateral axis that substantially intersects both said first lateral axis and said axis of flow, said electrodes comprising a conductive plastic sensing member configured from at least one from the group consisting of polyetheretherketone and a fluoropolymer material. 5. The magnetic flow meter of claim 4, wherein each of said electrodes are configured in a shielded arrangement having a longitudinal axis, a central conductive member, an annular conductive member, and a shield member made from at least one electrically conductive material and arranged in a substantially concentric manner with said central conductive member located on said longitudinal axis and said annular member being located between said central conductive member and said shield member; said central conductive member and said annular conductive member separated by a first interstitial insulative member; and said central conductive member and said annular conductive member adapted to be coupled to a signal amplifier, said shield member adapted to be coupled to an electrical ground. 6. The magnetic flow meter of claim 4, wherein said conductive plastic comprises a fluoropolymer impregnated with carbon particulates or carbon fibers. 7. A magnetic flow meter comprising: a housing formed from an insulative, non-contaminating, chemically inert material, said housing having an inner portion, at least one outer portion, and a conduit for fluid flow therethrough, said conduit having an axis of flow; said housing having a pair of diametrically opposed bottom ports formed therein and adjacent said conduit, said bottom ports being aligned with a first lateral axis that substantially intersects said axis of flow, wherein each of said bottomed ports are configured to secure a magnetic pole; said housing having a pair of diametrically opposed through-ports formed therethrough and in fluid communication with said conduit, said through-ports being aligned with a second lateral axis that substantially intersects both said first lateral axis and said axis of flow, wherein each of said through-ports are configured to secure an electrode; a pair of magnetic poles adapted to be inserted respectively into each of said pair of bottomed ports; a pair of electrodes, wherein the electrodes are adapted to be inserted respectively into each of said pair of through-ports; wherein said outer portion or portions are adapted to enclose said pair of electrodes and said pair of magnetic poles. 8. The magnetic flow meter of claim 7, wherein said magnetic poles comprise electromagnets that are connected by a magnetic return path, said housing is adapted to enclose said magnetic return path, and said electrodes have a conductive plastic sensing member. 9. The magnetic flow meter of claim 7, wherein said electrodes comprise a carbon-impregnated polymer material. 10. The magnetic flow meter of claim 7, wherein the insulative material is formed from a non-contaminating polymer. 11. A housing for a magnetic flow meter comprising: a body fabricated from an insulative, non-contaminating, chemically inert material, said body having an inner portion, at least one outer portion, and a conduit for fluid flow therethrough, said conduit having a flow axis; said body having a pair of diametrically opposed bottomed ports formed therein, said bottomed ports located on and aligned with a first lateral axis that substantially intersects said flow axis of said conduit, wherein said pair of diametrically opposed bottomed ports are adapted to receive a pair of magnetic poles; said body having a pair of diametrically opposed through-ports formed therethrough and accessing said conduit, thereby defining a second lateral axis that substantially intersects both said flow axis and said first lateral axis, said pair of through-ports adapted to receive a pair of electrodes; and said at least one outer portion being adapted to cover said pair of bottomed ports. 12. The housing of claim 11, wherein said non-contaminating material is selected from the group consisting of polytetrafluoroethylene (PTFE), polyvinylidine fluoride (PVDF), polyetheretherketone (PEEK), perfluoroalkoxy (PFA), and other fluorocarbon polymers. 13. The housing of claim 11, wherein said second lateral axis of said pair of diametrically opposed through-ports is substantially normal to said first lateral axis of said pair of diametrically opposed bottomed ports. 14. A method of measuring a flow of chemically corrosive fluid with a magnetic flow meter within a corrosive fluid flow circuit comprising: connecting said magnetic flow meter in said fluid flow circuit, said magnetic flow meter including an insulative, non-contaminating, chemically inert housing having a flow cross-section and a longitudinal axis normal to said flow cross-section that defines a conduit for fluid flow therethrough; a pair of magnetic poles diametrically opposed to each other and disposed on opposing sides of said longitudinal axis of said insulative housing; a pair of electrodes diametrically opposed to each other and disposed on opposing sides of said longitudinal axis of said insulative housing, said electrodes comprised of a fluoropolymer material; creating a magnetic field that passes through said longitudinal axis, thereby inducing a voltage difference between said electrodes; and measuring said voltage difference between said electrodes and correlating said voltage difference to a fluid flow velocity of said corrosive fluid. 15. A magnetic flow meter comprising: an insulative, non-contaminating, chemically inert housing having a conduit formed therethrough, said conduit having an axis of flow; means for generating a magnetic field that is substantially perpendicular to said axis of flow; and means for detecting an electromotive flux that is substantially perpendicular to said axis of flow, wherein said flux detecting means is adapted to be shielded to maximize flux detection and is configured from a fluoropolymer material impregnated with a conductive material adapted to sensing said electromotive flux.
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이 특허에 인용된 특허 (17)
Collins Timothy R. (Cologne MN) Chinnock Robert T. (Victoria MN) Grant Robert C. (Eden Prairie MN) Hamilton Dean T. (Cologne MN), Capacitive proximity monitoring device for corrosive atmosphere environment.
Collins Timothy R. (Cologne MN) Chinnock Robert T. (Victoria MN) Grant Robert C. (Eden Prairie MN) Hamilton Dean T. (Cologne MN), Proximity sensing probe.
Beerling, Freek; Heijnsdijk, Alexander Marnix; Neven, Josef; Nicolas, Christian, Magnetic-inductive flowmeter and method for producing a measuring electrode.
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