CN110383012B - Electrode structure of electromagnetic flowmeter - Google Patents
Electrode structure of electromagnetic flowmeter Download PDFInfo
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- CN110383012B CN110383012B CN201880014774.6A CN201880014774A CN110383012B CN 110383012 B CN110383012 B CN 110383012B CN 201880014774 A CN201880014774 A CN 201880014774A CN 110383012 B CN110383012 B CN 110383012B
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- corrosion
- metal film
- resistant metal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
Abstract
The electrode body (2) is a rigid body having conductivity. The head part (2a) of the electrode body (2) located in the pipe (20) is covered with an insulating layer (3), and the surface of the insulating layer (3) is further covered with a corrosion-resistant metal film (4). Thus, even if the corrosion-resistant metal film (4) is damaged, only the surface of the insulating layer (3) is exposed, and the value of the output signal from the signal electrode (1) does not become unstable.
Description
Technical Field
The present invention relates to an electrode structure of an electromagnetic flowmeter configured to extract an electromotive force corresponding to a flow rate of a fluid flowing through a pipe line via a signal electrode.
Background
Conventionally, this type of electromagnetic flowmeter has: an excitation coil that forms a magnetic field in a direction orthogonal to a flow direction of a fluid flowing through the measurement tube; and a signal electrode provided on an inner peripheral surface of the measurement tube so as to face in a direction orthogonal to the magnetic field generated by the excitation coil. In this electromagnetic flowmeter, an electromotive force generated in a fluid flowing in a measurement tube due to a magnetic field generated by an exciting coil is extracted by a signal electrode (see, for example, patent document 1).
Fig. 5 is a longitudinal sectional view showing an electrode structure of a related electromagnetic flowmeter. In this figure, the extrapolation type signal electrode 10(10A) is installed from the outside of the pipe 20. The signal electrode 10A includes a main body 11 in which a cylindrical shaft portion 11-1 and a disc-shaped sealing portion 11-2 are integrated. The lower portion 11-1a of the shaft portion 11-1 is located within the conduit 20 and is in contact with the fluid flowing within the conduit 20. The upper portion 11-1b of the shaft portion 11-1 is located outside the conduit 20. Lead wire 12 is connected to end surface (upper end surface) 11-1c of upper portion 11-1b of shaft portion 11-1. An electromotive force corresponding to the flow rate of the fluid flowing in the pipe 20 is extracted through the lead 12.
In the electrode structure of the electromagnetic flowmeter, a metal having high corrosion resistance (hereinafter, simply referred to as "corrosion-resistant metal"), for example, platinum is used as a material of the main body 11 (see, for example, patent document 2). In the electromagnetic flow meter, platinum, which is a corrosion-resistant metal, is used as a material of the main body 11 because a problem occurs in that measurement cannot be performed or becomes unstable in a corrosive solution. However, pure platinum has a problem that it has an electrode with a shape that cannot be produced due to insufficient strength or it is expensive.
Therefore, as shown in fig. 6, the following structure is considered: stainless steel is used as a material of the body 11, and a plating layer 13 of platinum, which is a corrosion-resistant metal (hereinafter, may be referred to as "corrosion-resistant metal film") covers the periphery 11-2a from the lower portion 11-1a of the shaft portion 11-1 to the sealing portion 11-2. That is, the lower portion 11-1a of the shaft portion 11-1 covered with the plating layer 13 is considered as the liquid contact portion 14, and the signal electrode 10(10B) is brought into contact with the fluid flowing through the pipe passage 20.
However, in the electrode structure shown in fig. 6, although it is inexpensive, when an abrasive substance, for example, a slurry-like substance is mixed into the fluid flowing through the pipe line 20, the plating layer 13 may be abraded and a part of the body 11 (stainless steel) may be exposed. When such a state is achieved, the exposed surface of the body 11 may be exposed to the fluid flowing in the conduit 20 and corroded, and the value of the electromotive force extracted through the lead 12 (the value of the output signal from the signal electrode 10B) may become unstable, thereby impairing stable measurement.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. Hei 4-319622
Patent document 2: japanese patent laid-open No. Hei 2-16024
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made to solve the above-described problems, and an object thereof is to provide an electrode structure of an electromagnetic flowmeter capable of performing stable measurement even if a corrosion-resistant metal film is damaged.
Means for solving the problems
In order to achieve the above object, an electrode structure of an electromagnetic flowmeter according to the present invention is configured such that an electromotive force corresponding to a flow rate of a fluid flowing in a pipe (20) is extracted by a signal electrode (1), and is characterized in that the signal electrode (1) includes a liquid contact portion (6) that contacts the fluid, and the liquid contact portion includes: a corrosion-resistant metal film (4) which is in contact with the fluid; and an insulating member (3) whose surface is covered with a corrosion-resistant metal film.
In this invention, the surface of the insulating member is covered with a corrosion-resistant metal film in the liquid contact portion of the signal electrode that is in contact with the fluid. Therefore, in the present invention, even if the corrosion-resistant metal film is damaged, only the surface of the insulating member is exposed, and the exposed surface is not corroded. This prevents the value of the output signal from the signal electrode from becoming unstable, and enables stable measurement.
In the present invention, for example, the signal electrodes (1A, 1B) are electrodes provided with rigid bodies (2A, 2B) having conductivity. Then, the insulating layer (3) sandwiched between the corrosion-resistant metal film (4) and the rigid bodies (2A, 2B) having conductivity is used as the insulating member of the present invention. In the present invention, for example, the signal electrodes (1C, 1D) are electrodes provided with rigid bodies (2C, 2D) having insulation properties. Then, a part (2a, 2-1a) of the rigid body having insulation properties is referred to as an insulation member in the present invention.
In the above description, for example, the components in the drawings corresponding to the components of the invention are indicated by bracketed reference numerals.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, since the surface of the insulating member is covered with the corrosion-resistant metal film, even if the corrosion-resistant metal film is damaged, only the surface of the insulating member is exposed, and the exposed surface is not corroded. This prevents the value of the output signal from the signal electrode from becoming unstable, and enables stable measurement.
Drawings
Fig. 1 is a longitudinal sectional view showing a 1 st embodiment of an electrode configuration of an electromagnetic flow meter of the present invention.
Fig. 2 is a diagram showing an example in which the signal electrodes are extrapolated in embodiment 1.
Fig. 3 is a longitudinal sectional view showing a 2 nd embodiment of the electrode configuration of the electromagnetic flow meter of the invention.
Fig. 4 is a diagram showing an example in which the signal electrode is extrapolated in embodiment 2.
Fig. 5 is a longitudinal sectional view of the electrode configuration of the related electromagnetic flowmeter.
Fig. 6 is a longitudinal sectional view of an electrode structure of a related electromagnetic flowmeter in which a platinum plating layer is formed.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(example 1)
Fig. 1 is a longitudinal sectional view showing a 1 st embodiment of an electrode configuration of an electromagnetic flow meter of the present invention. In the figure, the signal electrode 1(1A) is an interpolated signal electrode attached from the inside of the pipe 20. The signal electrode 1A includes a rivet-shaped body 2(2A), and a head 2A of the body 2A is positioned in the conduit 20.
In the signal electrode 1A, the main body 2A is a rigid body having conductivity, and the head 2A of the main body 2A located in the conduit 20 is covered with the insulating layer 3. The surface of the insulating layer 3 covering the head portion 2A of the main body 2A is further covered with a corrosion-resistant metal film 4. That is, on the signal electrode 1A, the insulating layer 3 is provided as an insulating member referred to in the present invention between the corrosion-resistant metal film 4 and the main body 2A (a rigid body having conductivity).
In addition, the body portion 2b of the body 2A has a thread ridge 2c formed on a portion distant from the head portion 2A. The signal electrode 1A is attached to the pipe 20 by positioning the thread 2c outside the pipe 20 and fastening it with a nut not shown. Further, a lead wire 5 is connected to the body 2b of the body 2A outside the conduit 20. In this example, the lead 5 is connected to the upper end face 2d of the body 2A. An electromotive force corresponding to the flow rate of the fluid flowing through the pipe line 20 is extracted through the lead 5.
In the present embodiment, a conductive material having rigidity, such as metal, glassy carbon, or conductive resin, is used as the material of the main body 2A. The corrosion-resistant metal film 4 is a film made of Pt, Ti, Au, Ta, WC, or the like. As the material of the insulating layer 3, ceramics (SiC, Al) can be used as a material capable of securing adhesion between the body 2A and the metal film 4 having corrosion resistance2O3、ZrO2、Y2O3、Si3N4SiO), a resin having high insulating properties, and the like.
In this electrode structure, the head portion 2A of the main body 2A is covered with the insulating layer 3 and the surface of the insulating layer 3 is covered with the corrosion-resistant metal film 4 in the liquid contact portion 6 of the signal electrode 1A which is in contact with the fluid, thereby providing a 2-layer structure. Therefore, even if the corrosion-resistant metal film 4 is damaged, only the surface of the insulating layer 3 (insulating member) is exposed, the main body 2A is not exposed, and the exposed surface is not corroded. This prevents the value of the output signal from the signal electrode 1A from becoming unstable, and enables stable measurement.
In fig. 1, the signal electrode 1 is an interpolation type, but may be an extrapolation type. Fig. 2 shows an example in which the signal electrode 1 is of an extrapolation type.
In fig. 2, the signal electrode 1(1B) is attached from the outside of the pipe 20. In the signal electrode 1B, the main body 2(2B) is a rigid body having conductivity and integrating the shaft portion 2-1 and the seal portion 2-2, and the lower portion 2-1a of the shaft portion 2-1 of the main body 2B is positioned in the conduit 20. Further, although not shown, the seal portion 2-2 of the main body 2B is urged from above by a spring. In addition, the lead 5 is connected to an end face (upper end face) 2-1c of the upper portion 2-1B of the main body 2B.
In this electrode structure, in the liquid contact portion 6 of the signal electrode 1B which is in contact with the fluid, the lower portion 2-1a of the shaft portion 2-1 of the main body 2B is covered with the insulating layer 3, and the surface of the insulating layer 3 is covered with the corrosion-resistant metal film 4, thereby providing a 2-layer structure. That is, in the signal electrode 1B, as in the signal electrode 1A shown in fig. 1, the insulating layer 3 is provided between the corrosion-resistant metal film 4 and the main body 2B (rigid body having conductivity) as an insulating member referred to in the present invention.
Therefore, even if the corrosion-resistant metal film 4 is damaged, only the surface of the insulating layer 3 (insulating member) is exposed, the main body 2B is not exposed, and the exposed surface is not corroded. This prevents the value of the output signal from the signal electrode 1B from becoming unstable, and enables stable measurement.
(example 2)
Fig. 3 is a longitudinal sectional view showing a 2 nd embodiment of the electrode configuration of the electromagnetic flow meter of the invention. This electrode structure is different from the electrode structure shown in fig. 1 in that the body 2 of the signal electrode 1 is made an insulating rigid body, a corrosion-resistant metal film 4 is provided to cover the head portion 2a and the body portion 2b of the body 2, and a lead 5 is connected to the corrosion-resistant metal film 4.
In the signal electrode 1(1C), the head 2a of the main body 2(2C) located in the conduit 20 is covered with the corrosion-resistant metal film 4. That is, the head portion 2a of the main body 2C (rigid body having insulation) which is the insulating member referred to in the present invention is covered with the corrosion-resistant metal film 4.
In the present embodiment, as the material of the main body 2C, a material capable of securing adhesion to the corrosion-resistant metal film 4 is preferable, and ceramics (SiC, Al) is used2O3、ZrO2、Y2O3、Si3N4SiO), a resin having high insulating properties, and the like. The corrosion-resistant metal film 4 is a film made of Pt, Ti, Au, Ta, WC, or the like.
In this electrode structure, the liquid contact portion 6 of the signal electrode 1C, which is in contact with the fluid, is configured such that the head portion 2a of the main body 2C (rigid body having insulation properties) is covered with the corrosion-resistant metal film 4. Therefore, even if the corrosion-resistant metal film 4 is damaged, only the surface of the head portion 2a (insulating member) of the main body 2C is exposed, and the exposed surface is not corroded. This prevents the value of the output signal from the signal electrode 1C from becoming unstable, and enables stable measurement.
In fig. 3, the signal electrode 1 is an interpolation type, but may be an extrapolation type. Fig. 4 shows an example in which the signal electrode 1 is of an extrapolation type.
In fig. 4, the signal electrode 1(1D) is attached from the outside of the pipe 20. In the signal electrode 1D, the main body 2(2D) is a rigid body having insulation properties and integrating the shaft portion 2-1 and the seal portion 2-2, and the lower portion 2-1a of the shaft portion 2-1 of the main body 2D is positioned in the conduit 20.
In the signal electrode 1D, the entire main body 2D is covered with the corrosion-resistant metal film 4. That is, in this signal electrode 1D, as in the signal electrode 1C shown in fig. 3, the lower portion 2-1a of the shaft portion 2-1 of the main body 2D, which is an insulating member referred to in the present invention, is covered with the corrosion-resistant metal film 4.
In this electrode structure, the liquid contact portion 6 of the signal electrode 1D, which is in contact with the fluid, is covered with the corrosion-resistant metal film 4 at the lower portion 2-1a of the shaft portion 2-1 of the main body 2D. Therefore, even if the corrosion-resistant metal film 4 is damaged, only the surface of the lower portion 2-1a (insulating member) of the shaft portion 2-1 of the body 2D is exposed, and the exposed surface is not corroded. This prevents the value of the output signal from the signal electrode 1D from becoming unstable, and enables stable measurement.
In the electrode structure shown in fig. 3, although the upper end surface 2d of the main body 2b of the main body 2C is not covered with the corrosion-resistant metal film 4, the portion may be covered with the corrosion-resistant metal film 4. That is, the entire body 2C may be covered with the corrosion-resistant metal film 4. In the electrode structure shown in fig. 4, the entire body 2D is covered with the corrosion-resistant metal film 4, but the body 2D may be partially covered with the corrosion-resistant metal film 4 as in the electrode structure shown in fig. 3.
It is to be noted that, of course, since the electrode structures of the above-described embodiments 1 and 2 are configured using the corrosion-resistant metal film 4, they are inexpensive and flexibly adaptable in shape, as in the electrode structure shown in fig. 6.
[ extension of the embodiment ]
The present invention has been described above with reference to examples, but the present invention is not limited to the examples. The configuration and details of the present invention can be variously modified as understood by those skilled in the art within the scope of the technical idea of the present invention.
Industrial applicability of the invention
The electrode structure of the electromagnetic flowmeter according to the present invention is applicable to various fields such as process control as an electrode structure of an electromagnetic flowmeter for measuring a flow rate of a fluid flowing through a pipe.
Description of the symbols
1 (1A-1D) … signal electrode, 2 (2A-2D) … main body, 2A … head part, 2b … main body part, 2-1 … shaft part, 2-1A … lower part, 2-2 … sealing part, 3 … insulating layer, 4 … corrosion-resistant metal film, 5 … lead wire and 6 … liquid contact part.
Claims (3)
1. An electrode structure of an electromagnetic flowmeter configured to extract an electromotive force corresponding to a flow rate of a fluid flowing in a pipe line via a signal electrode,
the signal electrode includes a liquid contact portion that contacts the fluid and an electrode main body that is a rigid body having conductivity,
the liquid receiving portion includes:
a corrosion resistant metal film in contact with the fluid; and
an insulating member whose surface is covered with the corrosion-resistant metal film,
the corrosion-resistant metal film is in contact with the rigid body having electrical conductivity.
2. An electrode construction for an electromagnetic flow meter according to claim 1,
the insulating member is provided as an insulating layer sandwiched between the corrosion-resistant metal film and the rigid body having conductivity.
3. An electrode construction for an electromagnetic flow meter according to claim 1,
a lead wire for extracting electromotive force generated in the fluid,
the lead wire is connected to the rigid body having conductivity on the outside of the pipe.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017038984A JP6754312B2 (en) | 2017-03-02 | 2017-03-02 | Electrode structure of electromagnetic flowmeter |
| JP2017-038984 | 2017-03-02 | ||
| PCT/JP2018/006443 WO2018159443A1 (en) | 2017-03-02 | 2018-02-22 | Electrode structure of electromagnetic flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110383012A CN110383012A (en) | 2019-10-25 |
| CN110383012B true CN110383012B (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201880014774.6A Active CN110383012B (en) | 2017-03-02 | 2018-02-22 | Electrode structure of electromagnetic flowmeter |
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| Country | Link |
|---|---|
| JP (1) | JP6754312B2 (en) |
| CN (1) | CN110383012B (en) |
| WO (1) | WO2018159443A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6940392B2 (en) | 2017-12-15 | 2021-09-29 | アズビル株式会社 | Electrode for detecting potential of electromagnetic flowmeter |
| JP6970001B2 (en) | 2017-12-15 | 2021-11-24 | アズビル株式会社 | Electrode for detecting potential of electromagnetic flow meter |
| JP6948244B2 (en) | 2017-12-15 | 2021-10-13 | アズビル株式会社 | Electrode for detecting potential of electromagnetic flowmeter |
| JP7039276B2 (en) | 2017-12-15 | 2022-03-22 | アズビル株式会社 | Electrode for detecting potential of electromagnetic flow meter |
| CN109141551A (en) * | 2018-09-27 | 2019-01-04 | 麦克传感器股份有限公司 | Ceramic lined electromagnet flow meter sensor high-field electrode encapsulating structure |
| CN109459099A (en) * | 2018-12-05 | 2019-03-12 | 重庆川仪自动化股份有限公司 | A kind of electrode structure and flowmeter improving electromagnetic flowmeter survey performance |
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| FR1266734A (en) * | 1960-07-25 | 1961-07-17 | Alto Instr Great Britain Ltd | Mounting of electrodes, especially for induction flow measuring devices |
| FR1495061A (en) * | 1966-09-01 | 1967-09-15 | Mawdsley S Ltd | Improvements to sealing devices for electrodes |
| CN86105077A (en) * | 1985-08-19 | 1987-02-18 | 山武霍尼韦尔公司 | Electromagnetic flowmeter |
| JP2599322B2 (en) * | 1991-10-09 | 1997-04-09 | 山武ハネウエル株式会社 | Manufacturing method of electrode for electromagnetic flow meter |
| CN101799309A (en) * | 2009-02-03 | 2010-08-11 | 株式会社东芝 | Measurement apparatus |
| CN102575949A (en) * | 2009-08-18 | 2012-07-11 | 高畑精密R&D中心株式会社 | Electromagnetic flow rate meter for conduit pipe and method for manufacturing same |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57179122U (en) * | 1981-05-09 | 1982-11-13 | ||
| JPS57188120U (en) * | 1981-05-27 | 1982-11-29 | ||
| JPS6246330U (en) * | 1985-08-15 | 1987-03-20 | ||
| JPS6242014A (en) * | 1985-08-19 | 1987-02-24 | Yamatake Honeywell Co Ltd | Manufacture of measuring pipe for electromagnetic flow meter |
| US5247837A (en) * | 1991-09-25 | 1993-09-28 | Rosemount Inc. | Magnetic flowmeter electrode |
| DE202005021645U1 (en) * | 2005-01-21 | 2009-02-19 | Abb Ag | Electrode in a measuring tube of a magnetic-inductive flowmeter |
-
2017
- 2017-03-02 JP JP2017038984A patent/JP6754312B2/en active Active
-
2018
- 2018-02-22 WO PCT/JP2018/006443 patent/WO2018159443A1/en active Application Filing
- 2018-02-22 CN CN201880014774.6A patent/CN110383012B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1266734A (en) * | 1960-07-25 | 1961-07-17 | Alto Instr Great Britain Ltd | Mounting of electrodes, especially for induction flow measuring devices |
| FR1495061A (en) * | 1966-09-01 | 1967-09-15 | Mawdsley S Ltd | Improvements to sealing devices for electrodes |
| CN86105077A (en) * | 1985-08-19 | 1987-02-18 | 山武霍尼韦尔公司 | Electromagnetic flowmeter |
| JP2599322B2 (en) * | 1991-10-09 | 1997-04-09 | 山武ハネウエル株式会社 | Manufacturing method of electrode for electromagnetic flow meter |
| CN101799309A (en) * | 2009-02-03 | 2010-08-11 | 株式会社东芝 | Measurement apparatus |
| CN102575949A (en) * | 2009-08-18 | 2012-07-11 | 高畑精密R&D中心株式会社 | Electromagnetic flow rate meter for conduit pipe and method for manufacturing same |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018159443A1 (en) | 2018-09-07 |
| JP6754312B2 (en) | 2020-09-09 |
| CN110383012A (en) | 2019-10-25 |
| JP2018146274A (en) | 2018-09-20 |
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