JP2002310749A - Electromagnetic flowmeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic flowmeter in which an electrode part in a measuring pipe with an installed coating material can be sealed surely. SOLUTION: The electromagnetic flowmeter is provided with a wet electrode hole which is formed in the measuring pipe and a pillar-shaped wet electrode which is inserted into the wet electrode hole and which comprises a flange part. The electromagnetic flowmeter is provided with the coating material which comprises a coating body installed on the inside diameter face of the measuring pipe, a tube connected to the coating body so as to cover the wet electrode hole and a turnup part connected to the tube part so as to cover the outer shape face of the measuring pipe around the wet electrode hole, a gasket part which is installed between the wet electrode and the turnup part, and a pressure means which presses the wet electrode to the gasket.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic flowmeter that can reliably realize an electrode portion seal of a measurement tube provided with a coating body.

[0002]

2. Description of the Related Art FIG. 8 is an explanatory view of the configuration of a conventional example generally used conventionally. In the figure, 1 is a measuring tube,
Reference numeral 2 denotes a lining body provided in the measuring tube 1. In this case, a fluororesin lining is used. Reference numeral 3 denotes a liquid contact electrode provided on the lining body 2. Reference numeral 4 denotes an insulating cap made of an insulating material that covers the upper part of the liquid contact electrode 3.

[0005] Reference numeral 5 denotes a boss provided on the measuring tube 1. Reference numeral 6 denotes an electrode cap attached to the boss. A spring 7 is provided between the electrode cap 5 and the insulating cap 4 and presses the liquid contact electrode 3 against the lining body 2.

In the above configuration, the liquid contact electrode 3 is pressed and fixed to the lining body 2 by the spring 7, and the seal of the liquid contact electrode 3 with respect to the measurement fluid FL is maintained.

FIG. 7 is an explanatory view of the structure of another conventional example generally used in the past, in which a rubber lining is used as the lining body 2.

[0006]

However, such an apparatus has the following problems. The lining body is adopted for the insulation pipe of the conventional electromagnetic flowmeter,
Because the portion is thick, for example, in the case of the conventional fluororesin lining 2 shown in FIG. 1, a structure has been adopted in which the liquid contact electrode 3 is pressed against the lining body 2 by a spring 7 to seal it.

Further, in the case of the rubber lining 2 of the conventional example shown in FIG. 2, since the rubber itself has elasticity, the structure in which the spring 7 is removed and sealing is performed has been adopted. However, since the lining body is very expensive, it is required to use an inexpensive coating body. However, if the insulating portion of the measuring tube 1 is coated, the coating portion is very thin and the conventional sealing structure cannot be adopted.

An object of the present invention is to solve the above-mentioned problems and to provide an electromagnetic flowmeter which can reliably realize an electrode portion seal of a measurement tube provided with a coating body.

[0009]

In order to achieve the above object, according to the present invention, there is provided an electromagnetic flow meter according to the present invention, wherein a liquid contact electrode hole provided in a measuring tube and the liquid contact electrode hole are provided. An electromagnetic flowmeter having a column-shaped wetted electrode having a flange portion inserted into the coating body, a coating body provided on the inner diameter surface of the measurement tube, and a cylinder connected to the coating body and covering the wetted electrode hole. A coating body having a portion connected to the cylindrical portion and a folded portion covering the outer surface of the measurement tube around the liquid contact electrode hole; and the liquid contacting device provided between the liquid contact electrode and the folded portion. A gasket portion for sealing the electrode and the folded portion,
Pressing means for pressing the liquid contact electrode against the gasket portion.

According to a second aspect of the present invention, in the electromagnetic flowmeter according to the first aspect, an elastic gasket is used as the gasket.

According to a third aspect of the present invention, in the electromagnetic flow meter according to the first or second aspect, an O-ring is used as the gasket portion.

According to a fourth aspect of the present invention, in the electromagnetic flow meter according to any one of the first to third aspects, one end is connected to the gasket portion, and the liquid contact electrode and the cylindrical portion of the coating body are connected to each other. And a pressing means for pressing the liquid contact electrode against the gasket portion.

According to a fifth aspect of the present invention, in the electromagnetic flow meter according to the fourth aspect, an elastic gasket is used as the second gasket.

According to a sixth aspect of the present invention, there is provided the electromagnetic flowmeter according to the sixth aspect, comprising: a liquid contact electrode hole provided in the measurement tube; and a columnar liquid contact electrode having a flange inserted into the liquid contact electrode hole. In the flowmeter, a coating main body provided on the inner diameter surface of the measurement tube, a cylindrical portion connected to the coating main body and covering the liquid contact electrode hole, and a cylindrical portion connected to the cylindrical portion and surrounding the liquid contact electrode hole. A coating body having a folded portion covering the outer surface of the measurement tube, and a coating provided between the folded portion and the connecting portion between the tubular portion and the liquid contact electrode, for sealing the liquid contact electrode and the connecting portion; And an O-ring.

According to a seventh aspect of the present invention, there is provided an electromagnetic flowmeter according to the seventh aspect, comprising: a wetted electrode hole provided in the measuring tube; and a columnar wetted electrode having a flange inserted into the wetted electrode hole. In the flowmeter, a coating main body provided on the inner diameter surface of the measurement tube, a cylindrical portion connected to the coating main body and covering the liquid contact electrode hole, and a cylindrical portion connected to the cylindrical portion and surrounding the liquid contact electrode hole. A coating body having a folded portion covering the outer surface of the measurement tube, and an O-ring provided between the liquid contact electrode and the tube portion to seal between the liquid contact electrode and the tube portion were provided. It is characterized by the following.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention. In the figure, the configuration of the same symbol as in FIG. 8 represents the same function. Hereinafter, only differences from FIG. 8 will be described.

In FIG. 1, a coating body 11 is provided with a coating body 111 provided on the inner diameter surface of the measuring tube 1.
A tubular portion 112 connected to the coating main body portion 111 and covering the wetted electrode hole; and a folded portion 113 connected to the tubular portion 112 and covering the outer surface of the measuring tube 1 around the wetted electrode hole.
And

In this case, the coating body 11 uses a resin coating. The gasket part 12
The pressing means 13 provided between the liquid contact electrode 3 and the folded portion 113 and sealing the liquid contact electrode 3 and the folded portion 113 presses the liquid contact electrode 3 against the gasket portion 12. in this case,
A spring 13 is used.

As a result, the gasket 12, the cylindrical portion 112 of the coating body 11, and the folded portion 11
3 is generally provided with a thin coating 1
Thus, an electromagnetic flowmeter that can reliably realize the electrode seal of the measurement tube 1 provided with 1 is obtained.

FIG. 2 is an explanatory view of a main part configuration of another embodiment of the present invention. In this embodiment, an elastic gasket is used as the gasket 21. As a result, since the elastic gasket portion is used as the gasket portion 21, an inexpensive electromagnetic flowmeter which does not require the pressing means 13 can be obtained.

FIG. 3 is an explanatory view of a main part configuration of another embodiment of the present invention. In this embodiment, an O-ring 31 is used as the gasket portion 31. As a result, since the O-ring 31 is used as the gasket part 31, the O-ring 31 is marketable, easily available, and an inexpensive electromagnetic flowmeter can be obtained.

FIG. 4 is an explanatory view of the structure of a main part of another embodiment of the present invention. In the present embodiment, the second gasket part 4
1 has one end connected to the gasket portion 12 and the liquid contact electrode 3
And the cylindrical portion 112 of the coating body 11 are sealed. The pressing means 42 presses the liquid contact electrode 3 against the gasket portion 12. In this case, a spring 42 is used as the pressing means 42.
Is used.

As a result, one end is connected to the gasket portion 12 and the second gasket portion 41 for sealing the liquid contact electrode 3 and the cylindrical portion 112 of the coating body 11 is provided. Is also sealed, and a more reliable electromagnetic flowmeter can be obtained.

FIG. 5 is an explanatory view of the structure of a main part of another embodiment of the present invention. In this embodiment, the second gasket portion 5
The elastic gasket part 51 is used as 1.
As a result, since the elastic gasket portion is used as the second gasket portion 51, an inexpensive electromagnetic flowmeter can be obtained without requiring the pressing means 42.

FIG. 6 is an explanatory diagram of a main part configuration of another embodiment of the present invention. In the present embodiment, the coating body 61
Is connected to the coating main body 611 provided on the inner diameter surface of the measuring tube 1,
A cylindrical portion 612 covering the liquid contact electrode hole, and connected to the cylindrical portion;
Folded portion 61 covering the outer surface of measurement tube 1 around the liquid contact electrode hole
And 3.

The O-ring 62 includes a folded portion 613 and a cylindrical portion 61.
2, and is provided between the liquid contact electrode 3 and the liquid contact electrode 3, and seals the liquid contact electrode 3 and the connection part.

As a result, an O-ring is provided between the connection part between the folded part 613 and the cylindrical part 612 and the liquid contact electrode 3 and seals the liquid contact electrode 3 and the connection part. The seal between the liquid electrode 3 and the coating body 61 can be ensured, and the folded portion 613 of the liquid contact electrode 3 and the coating body 61 can be secured.
And the cylindrical portion 612 can be prevented, and an electromagnetic flowmeter can be obtained in which insulation between the liquid contact electrode 3 and the coating body 61 can be more reliably ensured.

FIG. 7 is an explanatory diagram of a main part configuration of another embodiment of the present invention. In the present embodiment, the coating body 71
Is connected to the coating main body 711 provided on the inner diameter surface of the measuring tube 1,
It has a cylindrical portion 712 that covers the liquid contact electrode hole, and a folded portion 713 that is connected to the cylindrical portion 712 and covers the outer surface of the measurement tube 1 around the liquid contact electrode hole.

The O-ring 72 is provided between the liquid contact electrode 3 and the cylindrical portion 712.
And seals between the liquid contact electrode 3 and the cylindrical portion 712. As a result, the O-ring 72 provided between the liquid contact electrode 3 and the cylindrical portion 712 to seal the liquid contact electrode 3 and the cylindrical portion 712 is provided.
An inexpensive electromagnetic flow meter can be obtained.

It should be noted that the foregoing description has been directed to specific preferred embodiments for the purpose of describing and illustrating the present invention. Therefore, the present invention is not limited to the above-described embodiment, but includes many more changes and modifications without departing from the spirit thereof.

[0031]

As described above, according to the first aspect of the present invention,
According to the above, the following effects are obtained. In the part of the wetted electrode,
Since the gasket, the cylindrical portion of the coating body, and the folded portion are provided, an electromagnetic flowmeter that can reliably realize the sealing of the electrode portion of the measurement tube provided with the thin coating body is generally obtained.

According to the second aspect of the present invention, the following effects can be obtained. Since the elastic gasket is used as the gasket, an inexpensive electromagnetic flowmeter can be obtained without the need for pressing means.

According to the third aspect of the present invention, the following effects can be obtained. Because O-rings were used as gasket parts, O-rings are marketable and readily available,
An inexpensive electromagnetic flow meter can be obtained.

According to claim 4 of the present invention, the following effects can be obtained. One end is connected to the gasket part, and the second gasket part that seals the liquid contact electrode and the cylinder part of the coating body is provided. can get.

According to claim 5 of the present invention, the following effects are obtained. Since the elastic gasket portion is used as the second gasket portion, an inexpensive electromagnetic flowmeter that does not require a pressing means can be obtained.

According to the sixth aspect of the present invention, the following effects can be obtained. An O-ring is provided between the connection part between the folded part and the cylindrical part and the liquid contact electrode, and an O-ring for sealing the liquid contact electrode and the connection part is provided, so that the seal between the liquid contact electrode and the coating body can be secured. At the same time, it is possible to prevent the contact between the liquid contact electrode and the folded portion of the coating body and the cylindrical portion, and to obtain an electromagnetic flowmeter capable of ensuring the insulation between the liquid contact electrode and the coating body more reliably.

According to the seventh aspect of the present invention, the following effects can be obtained. Since an O-ring is provided between the liquid contact electrode and the cylinder and seals the liquid contact electrode and the cylinder, the sealing mechanism can be simplified and an inexpensive electromagnetic flowmeter can be obtained.

Therefore, according to the present invention, it is possible to realize an electromagnetic flowmeter that can reliably realize an electrode portion seal of a measurement tube provided with a coating body.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

FIG. 3 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

FIG. 4 is an explanatory view of a main part configuration of another embodiment of the present invention.

FIG. 5 is an explanatory view of a main part configuration of another embodiment of the present invention.

FIG. 6 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

FIG. 7 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

FIG. 8 is an explanatory view of a configuration of a main part of a conventional example generally used in the related art.

FIG. 9 is an explanatory diagram of a main part configuration of another conventional example generally used in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Measuring tube 3 Wetted electrode 4 Insulating cap 5 Boss 6 Electrode cap 7 Spring 11 Coating body 111 Coating main body 112 Tubular part 113 Folding part 12 Gasket part 13 Spring 21 Elastic body gasket part 31 O-ring 41 Second gasket part 42 Spring 51 Second gasket part 61 Coating body 611 Coating body part 612 Tube part 613 Folding part 62 O-ring 71 Coating body 711 Coating body part 712 Tube part 713 Folding part 72 O-ring FL Measurement fluid

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koichi Sato 2-9-132 Nakamachi, Musashino-shi, Tokyo F-term in Yokogawa Electric Corporation (reference) 2F035 BB02

Claims (7)

[Claims] 1. An electromagnetic flowmeter comprising: a wetted electrode hole provided in a measuring tube; and a columnar wetted electrode having a flange inserted into the wetted electrode hole. The provided coating main body, a tubular portion connected to the coating main body and covering the liquid contact electrode hole, and a folded portion connected to the cylindrical portion and covering the outer surface of the measurement tube around the liquid contact electrode hole. Coating body, a gasket portion provided between the liquid contact electrode and the folded portion to seal the liquid contact electrode and the folded portion, and pressing means for pressing the liquid contact electrode against the gasket portion. An electromagnetic flowmeter, comprising: 2. The electromagnetic flowmeter according to claim 1, wherein an elastic gasket is used as said gasket. 3. The electromagnetic flowmeter according to claim 1, wherein an O-ring is used as the gasket portion. 4. A second end which is connected to the gasket portion and seals the liquid contact electrode and the cylindrical portion of the coating body.
4. The electromagnetic flowmeter according to claim 1, further comprising: a gasket portion; and a pressing unit that presses the liquid contact electrode against the gasket portion. 5. An electromagnetic flowmeter according to claim 4, wherein an elastic gasket is used as said second gasket. 6. An electromagnetic flowmeter comprising: a wetted electrode hole provided in a measuring tube; and a columnar wetted electrode having a flange inserted into the wetted electrode hole. The provided coating body portion, a tubular portion connected to the coating body portion and covering the wetted electrode hole, and a folded portion connected to the tubular portion and covering the outer surface of the measurement tube around the wetted electrode hole. And a coating body provided between the connection part between the folded part and the cylindrical part and the liquid contact electrode, and sealing the liquid contact electrode and the connection part.
An electromagnetic flowmeter comprising a ring. 7. An electromagnetic flowmeter comprising: a wetted electrode hole provided in a measuring tube; and a columnar wetted electrode having a flange inserted into the wetted electrode hole. The provided coating body portion, a tubular portion connected to the coating body portion and covering the wetted electrode hole, and a folded portion connected to the tubular portion and covering the outer surface of the measurement tube around the wetted electrode hole. An electromagnetic flowmeter, comprising: a coated body having the same; and an O-ring provided between the liquid contact electrode and the cylindrical portion to seal between the liquid contact electrode and the cylindrical portion.