CN100387940C - Electromagnetic flow sensor of non-insulated measuring pipe - Google Patents
Electromagnetic flow sensor of non-insulated measuring pipe Download PDFInfo
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- CN100387940C CN100387940C CNB2005101119076A CN200510111907A CN100387940C CN 100387940 C CN100387940 C CN 100387940C CN B2005101119076 A CNB2005101119076 A CN B2005101119076A CN 200510111907 A CN200510111907 A CN 200510111907A CN 100387940 C CN100387940 C CN 100387940C
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- insulated measuring
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Abstract
The present invention provides an electromagnetic flow sensor of a non-insulated measuring pipe. The present invention comprises a rigid measuring pipe and an excitation unit, wherein the inner diameter of the rigid measuring pipe is equal to D, fluid which is measured flows in the rigid measuring pipe, and the excitation unit is arranged on the rigid measuring pipe and generates a magnetic field B which is perpendicular to the flow direction of the fluid. The flow velocity of the fluid in the rigid measuring pipe is equal to V. Under the action of the magnetic field B, the fluid in the rigid measuring pipe generates induction electric potential E, E=K0*D*B*V, wherein K0 is a coefficient. The rigid measuring pipe is made of non insulating material. The wall of an outer pipe of the rigid measuring pipe within the range of the action of the magnetic field B is provided with an a measuring point and a b measuring point. An output signal X used for measurement is directly led out, X=K1*K2*E, wherein K1 is a coefficient which is relevant to the positions of the a measuring point and the b measuring point on the outer wall of the rigid non-insulation measuring pipe, and K2 is a coefficient which is relevant to a unit volume resistor P of the material of the rigid measuring pipe. The electromagnetic flow sensor of the present invention is not provided with a measuring electrode, and induction potential which is directly taken from the outer wall of the non-insulation measuring pipe is used as the output signal. The present invention reduces the flow noise and leads the output signal to be stable. The sensor of the present invention has the advantages of simple manufacture and safe use. Simultaneously, the electromagnetic flow sensor can be easily applied to special fields.
Description
Technical field
The present invention relates to the electromagnetic flow transducer of a kind of electromagnetic flow transducer, particularly a kind of non-insulated measuring pipe.
Technical background
The principle of electromagnetic flow transducer is: the diameter of fluid under vertical magnetic field B effect is arranged is to flow in the measuring tube of D, the fluid cutting magnetic line produces the induced potential E that is proportional to rate of flow of fluid V on perpendicular to magnetic field and the direction that flows, E=K0 * D * B * V, K0 is a coefficient, and gets E as output signal.Existing general electromagnetic flow transducer all is to adopt the insulation measurement pipe in order to avoid output is reduced.The method of getting induced potential has two kinds: the one, on the tube wall of insulation measurement pipe, punch, the potential electrode of conduction is installed, induced potential is drawn and directly as output signal by the electrode contacting with fluid, this method is easy to generate bigger hydrodynamic noise and increases sensor uses unsafe factor; The 2nd, outside the tube wall of insulation measurement pipe, paste capacitor plate, draw induced potential as output signal with capacity coupled mode, this method is to the high frequency noise sensitivity, and requires the tube wall of insulation measurement pipe to have good dielectric coefficient, reduced the ratio of performance to price of instrument.
In addition, the electromagnetic flowmeter of measuring vascular flow in biomedicine is to utilize uninsulated flexible blood vessel directly as measuring tube, and directly draws measurement point from vessel outer wall and measure the induced potential signal.But the flexible measuring pipe will influence the accurate measurement of flow, be difficult to be applied to general electromagnetic flow transducer.
At present, the high performance signal disposal route that has patents such as ZL99113868.8 and 200510028474.8 can accurately be amplified very faint induced potential and processing.。Simultaneously, the nonisulated rigid conduit of various unit volume resistance can be made cheaply.Can reduce the hydrodynamic noise of signal with the nonisulated pipeline of rigidity as measuring tube, increase the long-term safety in utilization of measuring tube, improve the ratio of performance to price of electromagnetic flow transducer.
Summary of the invention
The electromagnetic flow transducer that the purpose of this invention is to provide a kind of non-insulated measuring pipe promptly uses the nonisulated pipeline of rigidity directly as measuring tube, and directly draws on the measuring tube outer wall and get induced potential as output signal.Simultaneously, adopt a subsidiary unit to come the unit volume resistance variations of dynamic monitoring measuring tube again so that the foundation of accurate correction output signal to be provided.
For achieving the above object, the present invention by the following technical solutions:
A kind of electromagnetic flow transducer of non-insulated measuring pipe, comprise a rigidity non-insulated measuring pipe that confession detected fluid that an internal diameter is D flows and an excitation unit that is installed in the magnetic field B vertical of generation on the rigidity non-insulated measuring pipe with direction of flow, fluid in the described rigidity non-insulated measuring pipe has flow velocity V, under the magnetic field B effect, fluid in the rigidity non-insulated measuring pipe produces induced potential E, E=K0 * D * B * V, K0 are coefficients; It is characterized in that described rigidity non-insulated measuring pipe made by non-insulating material, a and b two measuring points are arranged on the outer tube wall of the rigidity non-insulated measuring pipe in the magnetic field B reach, directly draw for the output signal X that measures, X=K1 * K2 * E, K1 is and a and 2 relevant coefficients in position on non-insulated measuring pipe (1) outer wall of b, and K2 is the relevant coefficient of unit volume resistance P with the material in rigidity non-insulated measuring pipe road (1).
The non-insulating material in above-mentioned rigidity non-insulated measuring pipe road should have following characteristic: the unit volume resistance P of rigidity non-insulated measuring pipe (1) is not less than the unit volume resistance of detected fluid, is not more than the input impedance of the follow-up instrument that will measure output signal X on the rigidity non-insulated measuring pipe outer tube wall as the resistance of a of output signal X and b point-to-point transmission.
The line of 2 of a and b is perpendicular to the flow direction of magnetic field B and fluid on rigidity non-insulated measuring pipe (1) outer tube wall of the electromagnetic flow transducer of above-mentioned non-insulated measuring pipe, and the central point by the rigidity non-insulated measuring pipe, can make COEFFICIENT K 1 value maximum like this.
The variation of the unit volume resistance P of subsidiary unit monitoring rigidity non-insulated measuring pipe is arranged on the outer wall of rigidity non-insulated measuring pipe in the electromagnetic flow transducer of above-mentioned non-insulated measuring pipe, make follow-up instrument come the value of dynamic correction factor K2 more accurately with the output C of subsidiary unit.
Above-mentioned subsidiary unit can be a temperature measurement unit of directly measuring rigidity non-insulated measuring pipe outside wall temperature value T, makes follow-up instrument come the value of dynamic correction factor K2 more accurately with T value as the output C of subsidiary unit.
Above-mentioned subsidiary unit can be a resistance measurement unit of directly measuring the resistance value R0 of point-to-point transmission on the rigidity non-insulated measuring pipe outer wall, makes follow-up instrument come the value of dynamic correction factor K2 more accurately with R0 value as the output C of subsidiary unit.
The present invention compared with prior art has following conspicuous outstanding substantive distinguishing features and remarkable advantage: electrodeless measuring tube can reduce hydrodynamic noise makes output signal more stable, and the simpler use of the manufacturing of sensor is safer.Simultaneously can make the easier special dimension that is applied to of electromagnetic flow transducer.
Description of drawings
Fig. 1 is one embodiment of the present of invention structural principle block diagram.
Fig. 2 is the example structure block diagram of temperature measurement unit as the subsidiary unit.
Fig. 3 is the example structure block diagram of resistance measurement unit as the subsidiary unit.
Specific embodiments
A preferred embodiment of the present invention such as following: referring to Fig. 1.
The electromagnetic flow transducer of this non-insulated measuring pipe comprises mobile 1, one excitation unit 2 that produces the magnetic field B vertical with direction of flow on rigidity non-insulated measuring pipe 1 of rigidity non-insulated measuring pipe of confession detected fluid that an internal diameter is D; Fluid in the described rigidity non-insulated measuring pipe 1 has flow velocity V, and under the magnetic field B effect, the fluid in the rigidity non-insulated measuring pipe 1 produces induced potential E, and E=K0 * D * B * V, K0 are coefficients; It is characterized in that on the outer tube wall of the rigidity non-insulated measuring pipe 1 in the magnetic field B reach a and b two measuring points being arranged, directly draw for the output signal X that measures, X=K1 * K2 * E, K1 is and a and 2 relevant coefficients in position on rigidity non-insulated measuring pipe 1 outer wall of b, and K2 is the relevant coefficient of unit volume resistance P with the material of rigidity non-insulated measuring pipe 1.
The rigidity non-insulated measuring pipe 1 of the electromagnetic flow transducer of above-mentioned non-insulated measuring pipe is to make with non-insulating material, the non-insulating material characteristic of rigidity non-insulated measuring pipe 1 is: the unit volume resistance P of rigidity non-insulated measuring pipe 1 is not less than the unit volume resistance of detected fluid, is not more than the input impedance of the follow-up instrument that will measure output signal X on rigidity non-insulated measuring pipe 1 outer tube wall as the resistance of a of output signal X and b point-to-point transmission.
The line of 2 of a and b is perpendicular to the flow direction of magnetic field B and fluid on rigidity non-insulated measuring pipe 1 outer tube wall of the electromagnetic flow transducer of above-mentioned non-insulated measuring pipe, and the central point by rigidity non-insulated measuring pipe 1, can make COEFFICIENT K 1 value maximum like this.
The electromagnetic flow transducer of above-mentioned non-insulated measuring pipe can be monitored the variation of the unit volume resistance P of rigidity non-insulated measuring pipe 1 by a subsidiary unit 3, makes follow-up instrument come more accurately the dynamically value of correction factor K2 with the output C of subsidiary unit 3.
Referring to Fig. 2.Above-mentioned subsidiary unit 3 is temperature measurement units of directly measuring rigidity non-insulated measuring pipe 1 outside wall temperature value T, can make follow-up instrument come the value of more accurate dynamic correction factor K2 as the output C of subsidiary unit 3 with the T value.
An alternative embodiment of the invention is same as the previously described embodiments substantially, and institute's difference is:
Referring to Fig. 3.Above-mentioned subsidiary unit 3 is resistance measurement unit of directly measuring the resistance value R0 of point-to-point transmission on rigidity non-insulated measuring pipe 1 outer wall, can make follow-up instrument come the value of dynamic correction factor K2 more accurately with R0 value as the output C of subsidiary unit 3.
Claims (6)
1. the electromagnetic flow transducer of a non-insulated measuring pipe comprises that the mobile rigidity non-insulated measuring pipe (1) of confession detected fluid that an internal diameter is D is installed in the excitation unit (2) that rigidity non-insulated measuring pipe (1) is gone up the generation magnetic field B vertical with direction of flow with one; Fluid in the described rigidity non-insulated measuring pipe (1) has flow velocity V, and under the magnetic field B effect, the fluid in the rigidity non-insulated measuring pipe (1) produces induced potential E, and E=K0 * D * B * V, K0 are coefficients; It is characterized in that described rigidity non-insulated measuring pipe (1) made by non-insulating material, a and b two measuring points are arranged on the outer tube wall of the rigidity non-insulated measuring pipe (1) in the magnetic field B reach, directly draw for the output signal X that measures, X=K1 * K2 * E, K1 is and a and 2 relevant coefficients in position on rigidity non-insulated measuring pipe (1) outer wall of b, and K2 is the relevant coefficient of unit volume resistance P with the material of rigidity non-insulated measuring pipe (1).
2. the electromagnetic flow transducer of non-insulated measuring pipe according to claim 1, the non-insulating material that it is characterized in that described rigidity non-insulated measuring pipe (1) should have following characteristic: the unit volume resistance P of rigidity non-insulated measuring pipe (1) is not less than the unit volume resistance of detected fluid, is not more than the input impedance of the follow-up instrument that will measure output signal X on rigidity non-insulated measuring pipe (1) outer tube wall as the resistance of a of output signal X and b point-to-point transmission.
3. the electromagnetic flow transducer of non-insulated measuring pipe according to claim 1, it is characterized in that the flow direction of the line of 2 of on rigidity non-insulated measuring pipe (1) outer tube wall a and b perpendicular to magnetic field B and fluid, and, make COEFFICIENT K 1 value maximum like this by the central point of rigidity non-insulated measuring pipe (1).
4. the electromagnetic flow transducer of non-insulated measuring pipe according to claim 1, it is characterized in that having on the outer wall of described rigidity non-insulated measuring pipe (1) variation of the unit volume resistance P of a subsidiary unit (3) monitoring rigidity non-insulated measuring pipe (1), make follow-up instrument come the value of attitude correction factor K2 more accurately with the output C of described subsidiary unit (3).
5. the electromagnetic flow transducer of non-insulated measuring pipe according to claim 4, it is characterized in that subsidiary unit (3) is a temperature measurement unit of directly measuring rigidity non-insulated measuring pipe (1) outside wall temperature value T, make follow-up instrument come the value of dynamic correction factor K2 more accurately as the output C of subsidiary unit (3) with T value.
6. the electromagnetic flow transducer of non-insulated measuring pipe according to claim 4, it is characterized in that subsidiary unit (3) is a resistance measurement unit of directly measuring the resistance value R0 of point-to-point transmission on rigidity non-insulated measuring pipe (1) outer wall, make follow-up instrument come the value of dynamic correction factor K2 more accurately as the output C of subsidiary unit (3) with R0 value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101119076A CN100387940C (en) | 2005-12-23 | 2005-12-23 | Electromagnetic flow sensor of non-insulated measuring pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101119076A CN100387940C (en) | 2005-12-23 | 2005-12-23 | Electromagnetic flow sensor of non-insulated measuring pipe |
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| CN1793789A CN1793789A (en) | 2006-06-28 |
| CN100387940C true CN100387940C (en) | 2008-05-14 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375891C (en) * | 2006-07-21 | 2008-03-19 | 上海大学 | Electromagnetic flow sensor for measuring non-full pipe flow and method for measurement |
| CN102788618B (en) * | 2012-07-30 | 2013-10-23 | 中国科学院合肥物质科学研究院 | Temperature difference flow meter for high temperature liquid metal |
| CN103591991B (en) * | 2013-11-08 | 2016-08-17 | 上海大学 | The electromagnetic flowmeter measured with fluid impedance |
| CN107990948B (en) * | 2017-11-17 | 2019-12-06 | 上海杉达学院 | Signal processing system comprising electromagnetic flowmeter |
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|---|---|---|---|---|
| GB831226A (en) * | 1957-05-01 | 1960-03-23 | Atomic Energy Authority Uk | Improvements in or relating to electromagnetic flowmeters |
| GB888222A (en) * | 1959-06-01 | 1962-01-31 | Ici Ltd | Electro-magnetic flow meter |
| US3138022A (en) * | 1961-02-14 | 1964-06-23 | Mayer Ferdy | Induction controlled flowmeters for conductive liquids |
| US3540286A (en) * | 1967-11-02 | 1970-11-17 | Atomic Energy Authority Uk | Flow pressure measurements |
| GB1417463A (en) * | 1972-05-25 | 1975-12-10 | Interatom | Flowmeters |
| US4008609A (en) * | 1974-10-15 | 1977-02-22 | Interatom, Internationale Atomreaktorbau Gmbh | Inductive flowmeter |
| EP0557529A1 (en) * | 1991-09-03 | 1993-09-01 | Aichi Tokei Denki Co., Ltd. | Electromagnetic flowmeter for water conveyance in semifull state |
| DE10116776A1 (en) * | 2000-04-04 | 2001-10-11 | Alfred Schoepf | Magnetic induction flow-meter for measuring the mean fluid flow rate of an electrically conducting fluid, e.g. used or sewage water in a sewage-treatment plant, that can be used with steel armored pipes and large diameter pipes |
| CN1421702A (en) * | 2002-12-24 | 2003-06-04 | 上海大学 | Integrated in-situ measuring method and system of slurry density and flow rate |
| CN1560569A (en) * | 2004-02-18 | 2005-01-05 | 沈阳市传感技术研究所 | Permanent-magnet small bore flowmeter |
-
2005
- 2005-12-23 CN CNB2005101119076A patent/CN100387940C/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB831226A (en) * | 1957-05-01 | 1960-03-23 | Atomic Energy Authority Uk | Improvements in or relating to electromagnetic flowmeters |
| GB888222A (en) * | 1959-06-01 | 1962-01-31 | Ici Ltd | Electro-magnetic flow meter |
| US3138022A (en) * | 1961-02-14 | 1964-06-23 | Mayer Ferdy | Induction controlled flowmeters for conductive liquids |
| US3540286A (en) * | 1967-11-02 | 1970-11-17 | Atomic Energy Authority Uk | Flow pressure measurements |
| GB1417463A (en) * | 1972-05-25 | 1975-12-10 | Interatom | Flowmeters |
| US4008609A (en) * | 1974-10-15 | 1977-02-22 | Interatom, Internationale Atomreaktorbau Gmbh | Inductive flowmeter |
| EP0557529A1 (en) * | 1991-09-03 | 1993-09-01 | Aichi Tokei Denki Co., Ltd. | Electromagnetic flowmeter for water conveyance in semifull state |
| DE10116776A1 (en) * | 2000-04-04 | 2001-10-11 | Alfred Schoepf | Magnetic induction flow-meter for measuring the mean fluid flow rate of an electrically conducting fluid, e.g. used or sewage water in a sewage-treatment plant, that can be used with steel armored pipes and large diameter pipes |
| CN1421702A (en) * | 2002-12-24 | 2003-06-04 | 上海大学 | Integrated in-situ measuring method and system of slurry density and flow rate |
| CN1560569A (en) * | 2004-02-18 | 2005-01-05 | 沈阳市传感技术研究所 | Permanent-magnet small bore flowmeter |
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