JP2003262544A - Electrode structure of electromagnetic flowmeter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode structure which avoids separating components including the electrode mounted on a measuring pipe during mounting/removing the electrode and facilitates handling. <P>SOLUTION: The electrode structure is composed of: a measuring pipe for flowing a measuring fluid in the interior having a lining extending along the inner wall to the outside of an opening of an electrode part 3; an electrode having a boss extending to surround the opening; the electrode being mounted on the measuring pipe such that it is inserted into the opening and sealed with the lining surface to expose at its end to the measuring fluid; a spring normally pressing the electrode to the measuring fluid; a first insulation cover open at the top, giving a pressing force onto the spring; an electrode unit having a rod-like electrode post in a second hollow tubular insulation cover with the electrode post top end pressure-fitted into and engaged with the top end of the electrode, thereby electrically connecting and inserting into an opening part of the first insulation cover; and an electrode cap engaged with the inner side wall of the boss from the top of the first insulation cover to cover it. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode structure of an electromagnetic flowmeter, and more particularly, to an electrode structure of an electromagnetic flowmeter in which each component forming an electrode is modularized so that a component including the electrode can be easily attached and detached. .

[0002]

2. Description of the Related Art As shown in FIG. 3, an electrode structure of an electromagnetic flowmeter according to the prior art has a measuring tube 31 having a lined lining 32 through which a conductive measuring fluid flows.
And the electrode part 3 having a structure in which a part of the measuring tube 31 is opened and the lining 32 is lined up to the wall surface of the opening.
3, a boss 34 formed so as to protrude outwardly so as to surround the opening, and a central portion of the boss 34 is penetrated to the inner wall surface of the measuring tube so that the tip portion comes into contact with the measurement fluid. An exposed substantially cross-shaped electrode 35,
Insulation cap 36 to cover from above the cross-shaped electrode 35
A spring 37 arranged so as to come into pressure contact with the upper end portion of the insulating cap 36, and a spring 37 which covers the spring 37 from above so as to apply a biasing force to the spring 37.
And an electrode cap 38 that is engaged and locked to the inner peripheral surface of the.

In the electrode structure of the electromagnetic flow meter having such a structure, first, the electrode 35 is mounted in the boss 34 provided in the opening portion, the insulating cap 36 is covered on the upper portion thereof, and the spring is formed on the upper portion of the insulating cap 36. The electrode portion 33 is completed by mounting 37 and covering the electrode cap 38.

When replacing the electrode 35, the electrode cap 38 is gradually removed from the boss 34 while paying attention to the urging force of the spring 37, the insulating cap 36 is removed, and then the electrode 35 is taken out and replaced. To do.

[0005]

However, in the electrode structure of the electromagnetic flowmeter described in the prior art, each component including the electrode has an independent structure. Therefore, when removed, each component becomes disjointed. This leads to problems such as loss of parts on site.

Therefore, in the electrode structure of the electromagnetic flow meter,
Even if the parts are removed, the parts do not fall apart, and there is a problem that the structure must be solved to prevent the parts from being lost.

[0007]

In order to solve the above problems, the electrode structure of the electromagnetic flowmeter according to the present invention has the following structure.

(1) In the electrode structure of the electromagnetic flow meter, a measurement fluid is flown inside, and a measurement tube having a lining struck up to an outer position of the inner wall surface and the opening portion forming the electrode portion, and the opening portion. An electrode portion provided on the measuring tube is provided so as to surround the tubing so as to surround it, and the electrode portion provided on the measuring tube is inserted from the outer side to be sealed by the lining surface and arranged so that its end portion faces the measuring fluid. An electrode to be provided, a spring that constantly presses the electrode in the direction of the fluid to be measured, a first insulating cover that gives a biasing force to the spring and has an upper opening
A rod-shaped electrode post is interposed inside the hollow cylindrical second insulating cover, and the tip end portion of the electrode post is press-fitted and engaged with the upper end of the electrode to be electrically connected to the first insulating cover. It is composed of an electrode unit inserted into the opening portion, and an electrode cap that engages with the inner peripheral wall surface of the boss from above the first insulating cover.

(2) Another electrode structure of the electromagnetic flowmeter is such that a measurement fluid is flown inside, and a measurement tube having a lining struck to an outer position of an inner wall surface and an opening portion forming an electrode portion, and the opening. An electrode portion provided on the measuring tube is provided so as to surround the portion and protrudes outward, and the electrode portion provided on the measuring tube is inserted from the outer side into the opening portion to seal with the lining surface and the end portion thereof faces the measurement fluid. An electrode to be disposed on the electrode, an insulating washer that engages with the electrode, and a rod-shaped electrode post interposed inside a hollow cylindrical insulating cover, and the tip portion of the electrode post is press-fitted to the upper end of the electrode. And an electrode unit to be electrically connected to each other, the electrode unit is provided at a central position, and is engaged with the insulating washer,
An electrode cap that engages with the inner peripheral wall surface of the boss to cover it,
Consists of.

As described above, by modularizing each component corresponding to the electrode to be attached / detached as a unit, it is possible to attach / detach each component without changing the electrodes when exchanging the electrodes.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of an electrode structure of an electromagnetic flowmeter according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the electrode structure of the electromagnetic flowmeter according to the first embodiment of the present invention is such that the fluid to be measured is flown inside and the inner wall surface and the opening portion 13 forming the electrode portion 12 are formed. The structure is provided with a measuring pipe 11 having a lining 14 that is struck to the outer side position, and a boss 15 that is formed so as to project outward so as to surround the opening 13.

The electrode portion 12 provided in the measuring tube 11 is a substantially cross-shaped electrode 16 which is inserted into the opening portion 13 from the outside and is sealed with a lining surface and the end portion of which is disposed so as to face the measurement fluid. A spring 17 that constantly presses the electrode 16 in the direction of the fluid to be measured, a first insulating cover 18 that applies an urging force to the spring 17 and has an upper opening, and a hollow cylindrical second insulating cover 19 are provided. Rod-shaped electrode post 2
0, and the tip of this electrode post 20 is connected to the electrode 1
6, the electrode unit 21 is inserted into the opening of the first insulating cover 18 by press-fitting engagement with the upper end of the first insulating cover 18, and the inner wall surface of the boss 15 from the upper portion of the first insulating cover 18. The electrode cap 22 to be engaged with the cover and the boss 15
The cover 23 covers the upper end of the.

A conductive wire 24 is fixed to the upper end of the electrode post 20 with a screw 25.
Is connected to a measuring device (not shown).

In the electrode unit 21 having such a structure, the electrode post 20 is attached by press-fitting it to the electrode 16 in a state where each component is attached, and the component between them, for example, the spring 17 and the first insulating cover. 18, the electrode cap 22 and the like do not fall apart even if the electrode 16 is removed by loosening the electrode cap 22. With the electrode unit 21 in such a module state, the electrode can be easily attached to and detached from the measuring pipe 11 even in a piped state. Further, since the parts do not fall apart, there is no problem of parts being lost in the field.

Next, the electrode structure of the electromagnetic flowmeter of the second embodiment according to the present invention will be described with reference to FIG.

The electrode structure of the electromagnetic flowmeter according to the second embodiment has a lining having a strong elastic force, such as rubber,
It has a structure in which the electrode is pressed by an electrode cap without using a spring, and the lining 14 struck to the outside position of the inner wall surface and the opening portion 13 forming the electrode portion 12A is made to flow while the measurement fluid is flown inside. Measuring tube 11
And a boss 15 that is formed so as to project outside so as to surround the opening 13.

The electrode portion 12A provided on the measuring tube 11 is a substantially cross-shaped electrode 16 which is inserted into the opening portion 13 from the outside and is sealed with a lining surface and the end portion of which is arranged so as to face the measurement fluid. An insulating washer 26 that engages with the electrode 16 and a rod-shaped electrode post 20 are provided inside the hollow cylindrical insulating cover 19A, and the tip end portion of the electrode post 20 is press-fitted into the upper end of the electrode 16. The electrode unit 21 to be electrically connected and the electrode unit 21 at the center position are engaged with the insulating washer 26 and the boss 1
An electrode cap 22A which is engaged with the inner peripheral wall surface of 5 to cover,
The cover 23 covers the upper end of the boss 15.

A conductive wire 24 is fixed to the upper end of the electrode post 20 with a screw 25.
Is connected to a measuring device (not shown).

In the electrode unit 21 having such a structure, the electrode posts 20 are attached by press-fitting them to the electrodes 16 in a state where the respective components are attached, and the components between them, such as the insulating washer 26 and the electrode cap 22A.
For example, even if the electrode cap 22A is loosened and the electrode 16 is removed, the parts do not fall apart. With the electrode unit 21 in such a module state, the measuring tube 11
The electrode 16 can be easily attached and detached even in a piping state. Further, since the parts do not fall apart, there is no problem of parts being lost in the field.

[0021]

As described above, in the electrode structure of the electromagnetic flowmeter according to the present invention, by pressing the electrode post into the electrode in a state in which each component is attached, the component between them, such as a spring or an insulator, is insulated. Even if the cover, electrode cap, etc. are loosened and the electrode is removed, the parts do not fall apart, making electrode installation easier.
Moreover, there is an effect that problems such as loss of each component can be eliminated.

[Brief description of drawings]

FIG. 1 is a sectional view showing an electrode structure of an electromagnetic flow meter according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an electrode structure of an electromagnetic flow meter according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of an electrode structure of an electromagnetic flow meter according to the related art.

[Explanation of symbols]

11 measuring tubes 12 Electrode part 12A electrode part 13 openings 14 lining 15 Boss 16 electrodes 17 spring 18 First insulation cover 19 Second insulation cover 20 electrode post 21 electrode unit 22 Electrode cap 22A electrode cap 23 cover 24 conductors 25 screws

Claims (2)

[Claims] 1. A measuring tube having a lining that is used to flow a measuring fluid inside and is struck up to an outer position of an opening portion that forms an inner wall surface and an electrode portion, and a boss that is formed so as to project outward so as to surround the opening portion. The electrode part provided in the measurement tube is an electrode which is inserted into the opening from the outside and is sealed so as to be sealed by the lining surface and whose end is exposed to the measurement fluid, and the electrode is always provided. A spring that presses in the direction of the fluid to be measured, a first insulating cover that gives an urging force to the spring and has an opening at the top, and a hollow cylindrical second insulating cover with a rod-shaped electrode post interposed therein An electrode unit formed by press-fitting and engaging an upper end of the post with an upper end of the electrode to insert the electrode into an opening of the first insulating cover, and from the upper part of the first insulating cover to the electrode unit. Inner wall of boss It engaged and electrode cap covering it, the electrode structure of an electromagnetic flow meter comprising a. 2. A measuring tube having a lining which is used to flow a measuring fluid therein and which is struck up to an outer position of an inner wall surface and an opening forming an electrode section, and a boss projecting outward so as to surround the opening. An electrode section provided on the measurement tube, the electrode section being inserted into the opening section from the outside and sealed by the lining surface, and the end section thereof being arranged to face the measurement fluid; Insulation washer that fits
An electrode unit that interposes a rod-shaped electrode post inside a hollow cylindrical insulating cover and press-fits and engages the tip end portion of the electrode post with the upper end of the electrode to electrically connect the electrode unit to the center position. An electrode structure of an electromagnetic flow meter, comprising: an electrode cap, which is provided with the insulating washer and which engages with an inner peripheral wall surface of the boss.