JP2009168629A - Electromagnetic flow meter - Google Patents

Abstract

A fluid entering through an electrode is sealed.
A through-hole 14 provided in a lining body 13 on an inner diameter surface of a measurement tube 12 and a cylindrical shape which is connected to the measurement tube 12 with the through-hole 14 as a central axis and is erected outward. An electrode boss 15, a seal body 16 formed of the same resin as the lining body 13 formed at the inner bottom position of the electrode boss 15, and a protrusion 17 on an outer peripheral edge inserted from the inside of the through hole 14 are provided. A columnar electrode 18 whose one end is in contact with the fluid to be measured, an insulating washer 19 that engages from the other end of the electrode 18 and covers the surface of the seal body 16, and a spring disposed above the insulating washer 19. 21 and a nut 23 for urging the spring 21, the insulating washer 19 is provided with a protrusion 27 on the outer peripheral edge thereof to seal the bite into the seal body 16, and Sealed with O-ring 26 is provided the insulating washer 19 and the groove 25 in a position engaging the pole 18.
[Selection] Figure 1

Description

  The present invention relates to an electromagnetic flow meter, and more particularly to an interpolated electrode structure that improves sealing performance and reduces insulation deterioration even when the fluid is a lining permeable fluid that flows through a measuring tube.

As shown in FIG. 3, the electrode structure of the electromagnetic flowmeter in the prior art includes a measurement tube 12 through which the measurement fluid 11 flows, a cylindrical lining body 13 lined on the inner diameter surface of the measurement tube 12, a measurement tube 12, A through-hole 14 provided by penetrating the lining body 13 through a so-called concave (bored) process, and a cylindrical shape continuously provided on the measuring tube 12 with the through-hole 14 as a central axis and standing outward. The electrode boss 15, the inner bottom portion of the electrode boss 15, the seal body 16 formed of the same resin as the lining body 13 with the through hole 14 as the central axis, and the seal inserted by inserting from the inside of the through hole 14 A columnar electrode 18 that is sealed by the body 16 and has a protrusion 17 on the outer peripheral edge formed to have an enlarged diameter and is disposed so that one end is in contact with the measurement fluid 11, and is engaged from the other end of the electrode 18. And covers the surface of the seal body 16 A first insulating washer 19B that is housed, a spring 21B that is positioned above the first insulating washer 19B with the electrode 18 as a central axis, and a spacer 20 that is disposed between the springs 21B, A second insulating washer 22 engaged with the upper position of the spring 21B, a nut 23 that interposes the second insulating washer 22 and is screwed to the electrode 18 to apply a biasing force to the spring 21B, and the electrode 18 And a signal line 24 connected to the.

  One end of the electrode 18 on the side in contact with the measurement fluid 11 is formed in an enlarged disk shape, and an annular protrusion 17 is provided on the inner peripheral edge of the disk shape. The other end of the columnar shape that is continuously provided with a thread groove for screwing with the nut 23 is provided.

Such an electrode 18 is inserted into the counterbore through-hole 14 from the side of the lining body 13 in contact with the measurement fluid 11, and a first insulating washer 19B, a spacer 20, a spring 21B are attached, and a second insulating washer 22 is further attached. Tighten with nut 23.
Then, the protrusion 17 provided at one end of the electrode 18 bites into the lining body 13 so that the electrode 18 can be sealed.
Japanese Patent Laid-Open No. 2007-240231

However, in the electrode structure of the electromagnetic flow meter described in the prior art, the portions other than the portion that contacts the measurement fluid of the electrode are sealed by causing the annular protrusion provided on the electrode to bite into the lining body. However, since the seal is only at one portion of the protruding portion of the electrode, for example, if there is a counterbore processing failure of the through hole of the lining body or a processing failure of the protrusion portion, a sealing failure occurs and fluid leaks from the electrode. There is a problem that there is a possibility.

  Therefore, there is a problem that must be solved in a structure that improves the sealing performance of the electrode and reduces the deterioration of insulation of the electrode.

  In order to solve the above problems, the electromagnetic flowmeter of the present invention is configured as follows.

(1) An electromagnetic flowmeter includes a measurement tube through which a measurement fluid flows, a cylindrical lining body lined on the inner diameter surface of the measurement tube, and a through-hole provided through the measurement tube and the lining body. A cylindrical electrode boss that is connected to the measuring tube with the through hole as a central axis and is erected in the outer direction, and is formed at an inner bottom portion of the electrode boss, with the through hole as a central axis. A sealing body formed of the same resin as the lining body, and a protrusion on an outer peripheral edge that is inserted from the inside of the through-hole and sealed with the sealing body and formed to have an enlarged diameter, one end of which is the measurement A columnar electrode disposed in contact with a fluid; an insulating washer that is engaged from the other end of the electrode and covers the surface of the seal body; and an upper position of the insulating washer. , With the electrode as the central axis And a nut that is screwed into the electrode and maintains a state in which a biasing force is applied to the spring, and the insulating washer is provided with a protrusion on an outer peripheral edge to bite into the seal body In this way, a groove is provided at a position where the electrode is sealed and engaged with the insulating washer of the electrode, and an O-ring is provided.
(2) The electromagnetic flowmeter according to (1), wherein the insulating washer has a spacer function.

(3) The electromagnetic flowmeter includes a measurement tube through which a measurement fluid flows, a cylindrical lining body lined on the inner diameter surface of the measurement tube, and a through-hole provided through the measurement tube and the lining body. A cylindrical electrode boss that is connected to the measuring tube with the through hole as a central axis and is erected in the outer direction, and is formed at an inner bottom portion of the electrode boss, with the through hole as a central axis. A sealing body formed of the same resin as the lining body, and a protrusion on an outer peripheral edge that is inserted from the inside of the through-hole and sealed with the sealing body and formed to have an enlarged diameter, one end of which is the measurement A columnar electrode disposed in contact with a fluid; an insulating washer that is engaged from the other end of the electrode and covers the surface of the seal body; and an upper position of the insulating washer. , With the electrode as the central axis And a nut that is screwed into the electrode and maintains a state in which a biasing force is applied to the spring, and the insulating washer is provided with a protrusion on an outer peripheral edge to bite into the seal body In this way, a groove is provided at a position where it is sealed and engaged with the electrode, and an O-ring is provided.

In the present invention, in addition to the electrode protrusion, the washer protrusion is sealed, and a groove is provided in the electrode or the insulating washer, and an O-ring is attached to seal the fluid entering through the electrode. Redundancy is achieved and reliability is improved.

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

The electrode structure of the electromagnetic flowmeter according to the first embodiment of the present invention is that an insulating washer that also functions as a spacer is provided with a protrusion to bite and seal the seal body, and a groove is provided in the electrode to fit an O-ring. As shown in FIG. 1, the double sealing performance is realized by measuring pipe 12 through which measurement fluid 11 flows, cylindrical lining body 13 lined on the inner diameter surface of measuring pipe 12, and The measurement tube 12 and the lining body 13 are penetrated by a so-called concave (bored) process, and the measurement tube 12 is connected to the measurement tube 12 with the through hole 14 as a central axis, and stands outward. A cylindrical electrode boss 15 provided, a seal body 16 formed at the inner bottom position of the electrode boss 15 and made of the same resin as the lining body 13 around the through hole 14, and from the inside of the through hole 14 Insert and seal 16 is provided with a protrusion 17 on the outer peripheral edge formed to be enlarged in diameter and sealed, and a columnar electrode 18 disposed so that one end thereof is in contact with the measurement fluid 11 and engaged from the other end of the electrode 18. The first insulating washer 19 that is accommodated so as to cover the surface of the seal body 16 and also has a function of a spacer having a predetermined thickness, and the upper position of the first insulating washer 19, and the first axis with the electrode 18 as the central axis A spring 21 arranged so as to surround the spacer portion of the insulating washer 19, a second insulating washer 22 engaged with the upper position of the spring 21, and a second insulating washer 22 are interposed and screwed into the electrode 18. And a nut 23 that maintains a state in which a biasing force is applied to the spring 21, and a signal line 24 connected to the electrode 18.

The first insulating washer 19 has a configuration in which a protrusion 27 is provided on an outer peripheral edge, and the protrusion 27 is sealed so as to bite into the seal body 16.
The first insulating washer 19 has a spacer function, and the spring 21 is fitted while being guided by the spacer, so that the spring 21 is prevented from falling or buckling.

One end of the electrode 18 on the side in contact with the measurement fluid 11 is formed in an enlarged disk shape, and an annular protrusion 17 is provided on the inner peripheral edge of the disk shape. The other end of the columnar shape that is continuously provided with a thread groove for screwing with the nut 23 is provided.
Furthermore, a groove 25 is provided in a portion of the columnar electrode 18 located in the spacer portion of the first insulating washer 19, and the groove 25 is provided with an O-ring 26, so that the electrode disposed in the through hole 14 is provided. The fluid entering through 18 can be sealed by this O-ring 26.

Such an electrode 18 is inserted into the counterbore through-hole 14 from the side of the lining body 13 in contact with the measurement fluid 11, a first insulating washer 19 and a spring 21 are attached, and a second insulating washer 22 is further attached and a nut 23 is attached. tighten.
Then, the protrusion 17 provided at one end of the electrode 18 bites into the lining body 13 so that the electrode 18 can be sealed, and further, the intrusion of fluid is sealed by the O-ring 26 provided on the electrode 18. can do.

  Next, the electromagnetic flow meter of the second embodiment will be described with reference to FIG.

The electrode structure of the electromagnetic flowmeter according to the second embodiment of the present invention is that an insulating washer is provided with a protrusion to bite and seal the seal body, and a groove is provided on the inner peripheral surface side of this insulating washer to fit an O-ring. As shown in FIG. 2, a double sealing property is realized by attaching it to the measurement pipe 12 through which the measurement fluid 11 flows, and a cylindrical lining body 13 lined on the inner diameter surface of the measurement pipe 12. A through-hole 14 provided by penetrating the measurement tube 12 and the lining body 13 through a so-called concave (bored) process, and the measurement tube 12 with the through-hole 14 as a central axis, and connected to the measurement tube 12 in the outward direction. A cylindrical electrode boss 15 erected on the inner side of the electrode boss 15, a seal body 16 formed of the same resin as the lining body 13 with the through hole 14 as a central axis, and a through hole 14. Insert from inside and see A columnar electrode 18 that is sealed by the body 16 and has a protrusion 17 on the outer peripheral edge formed to have an enlarged diameter and is disposed so that one end is in contact with the measurement fluid 11, and is engaged from the other end of the electrode 18. A first insulating washer 19A that covers the surface of the seal body 16 and an upper position of the first insulating washer 19A, with the electrode 18 as the central axis, are arranged above the first insulating washer 19A. A spring 21A, which is a disc spring, a second insulating washer 22 engaged with the upper position of the spring 21A, and a second insulating washer 22 interposed therebetween, screwed into the electrode 18 and applied with a biasing force to the spring 21A And a signal line 24 connected to the electrode 18.

The first insulating washer 19 </ b> A is configured to be provided with a protruding portion 27 on the outer peripheral edge and seal the protruding portion 27 so as to bite into the seal body 16.
Further, a groove 28 is provided on the electrode 18 side of the first insulating washer 19A, and an O-ring 29 is provided in the groove 28, so that the fluid entering through the electrode 18 disposed in the through hole 14 can be removed. It can be sealed with an O-ring 29.

  One end of the electrode 18 on the side in contact with the measurement fluid 11 is formed in an enlarged disk shape, and an annular protrusion 17 is provided on the inner peripheral edge of the disk shape. The other end of the columnar shape that is continuously provided with a thread groove for screwing with the nut 23 is provided.

Such an electrode 18 is inserted into a through-hole 14 that has been counterbored from the side of the lining body 13 that is in contact with the measurement fluid 11, a first insulating washer 19 A and a spring 21 A are attached, and a second insulating washer 22 is further attached and a nut 23 is attached. tighten.
Then, the protrusion 17 provided at one end of the electrode 18 bites into the lining body 13 so that the electrode 18 can be sealed, and fluid can also enter by the O-ring 29 provided in the first insulating washer 19A. Can be sealed.

In addition to the electrode protrusion, the washer protrusion is sealed, and a groove is provided in the electrode or the insulating washer, and an O-ring is attached to seal the fluid entering through the electrode, thereby realizing a double seal. Provide an electromagnetic flow meter.

It is explanatory drawing which showed the electrode structure of the electromagnetic flowmeter of 1st Example of this invention. It is explanatory drawing which showed the electrode structure of the electromagnetic flowmeter of 2nd Example of this invention. It is explanatory drawing which showed the electrode structure of the electromagnetic flowmeter in a prior art.

Explanation of symbols

11 Measuring fluid 12 Measuring pipe 13 Lining body 14 Through hole 15 Electrode boss 16 Sealing body 17 Protrusion 18 Electrode 19 First insulating washer 19A First insulating washer 21 Spring 21A Spring 22 Second insulating washer 23 Nut 24 Signal line 25 Groove 26 O Ring 27 Projection 28 Groove 29 O-ring

Claims (3)

A measuring tube through which the measuring fluid flows;
A cylindrical lining body lined on the inner diameter surface of the measuring tube;
A through hole provided through the measurement tube and the lining body;
Cylindrical electrode boss that is continuous with the measurement tube with the through hole as a central axis and is erected in the outer direction;
A seal body formed of the same resin as the lining body, with the through-hole as a central axis, formed at the inner bottom position of the electrode boss;
A columnar electrode that is inserted from the inside of the through hole and sealed with the seal body and has a protrusion on the outer peripheral edge formed to have an enlarged diameter, and is arranged so that one end is in contact with the measurement fluid;
An insulating washer that is engaged from the other end of the electrode and accommodated so as to cover the surface of the seal body;
A spring at an upper position of the insulating washer and having the electrode as a central axis;
A nut that is screwed into the electrode and maintains a state in which a biasing force is applied to the spring;
With
The insulating washer is provided with a protrusion on an outer peripheral edge and sealed so as to bite into the seal body, and is provided with an O-ring provided with a groove at a position where the electrode is engaged with the insulating washer. Electromagnetic flow meter to do.   The electromagnetic flow meter according to claim 1, wherein the insulating washer has a spacer function. A measuring tube through which the measuring fluid flows;
A cylindrical lining body lined on the inner diameter surface of the measuring tube;
A through hole provided through the measurement tube and the lining body;
Cylindrical electrode boss that is continuous with the measurement tube with the through hole as a central axis and is erected in the outer direction;
A seal body formed of the same resin as the lining body, with the through-hole as a central axis, formed at the inner bottom position of the electrode boss;
A columnar electrode that is inserted from the inside of the through hole and sealed with the seal body and has a protrusion on the outer peripheral edge formed to have an enlarged diameter, and is arranged so that one end is in contact with the measurement fluid;
An insulating washer that is engaged from the other end of the electrode and accommodated so as to cover the surface of the seal body;
A spring at an upper position of the insulating washer and having the electrode as a central axis;
A nut that is screwed into the electrode and maintains a state in which a biasing force is applied to the spring;
With
The insulating washer is provided with a projecting portion on an outer peripheral edge and sealed so as to bite into the seal body, and has an O-ring provided with a groove at a position where the insulating washer is engaged with the electrode. .

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