JP3204103B2 - Electromagnetic flow meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic flow meter which is inexpensive, can freely select required materials, and can realize a highly reliable earth ring.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory view of the structure of a conventional example generally used in the prior art. FIG. 7 is a side view of FIG. 6, for example, Japanese Patent Publication No. 58-501552, entitled "Magnetic Induction Type". Measurement value detector for flow measurement device ”, September 1, 1983
This is indicated in the announcement on the 6th.

In the drawing, reference numeral 1 denotes a measuring fluid 2 having an inner diameter 3
This is a measuring tube made of ceramics flowing through. Reference numeral 4 denotes a tapered portion provided at the opening of the inner diameter portion 3. Reference numeral 5 denotes a columnar measurement electrode that is inserted into and fixed to the measurement tube 1 from the radial direction of the measurement tube 1.

[0004] Reference numeral 6 denotes a ring-shaped inner diameter portion 61 provided near the tapered portion 4 and a lead portion 62 extending from the inner diameter portion 61 to the outer peripheral portion of the measuring tube 1. It is a ring.

In the above configuration, when the measuring fluid 2 flows through the measuring tube 1, an electric signal corresponding to the flow rate of the measuring fluid 2 is extracted from the measuring electrode 5.

[0006]

However, the earth ring 6 of such an electromagnetic flowmeter has the following disadvantages. (1) 800 ° C because it is a baked body of platinum paste
It is necessary to heat to a certain degree, and heating equipment is required.

(2) Since it is a baked body of a platinum paste and has a thickness of only about several μm, when a solid is contained in the measurement fluid 2, it is easily lost due to abrasion. (3) Since it is a baked body of platinum paste, the measuring tube 1
However, for example, a material made of a heat-resistant material such as a ceramic material is good, but it cannot be applied to a material made of a material having no heat resistance or when the lining of the measuring tube 1 has no heat resistance.

The present invention solves this problem. An object of the present invention is to provide an electromagnetic flowmeter which is inexpensive, can freely select required materials, and can realize a highly reliable earth ring.

[0009]

In order to achieve this object, the present invention provides: (1) An electromagnetic flowmeter having a tapered portion at an inner diameter opening of a measuring tube, the electromagnetic flowmeter being provided along a side plane of the measuring tube. A ring-shaped earth ring main body provided and bent and connected to an inner diameter portion of the earth ring main body, the inner ring having an inner diameter larger than the inner diameter of the measurement tube, and provided along the surface of the tapered portion. A thin plate-shaped earth ring integrally formed with a ring-shaped inner diameter portion and a measurement tube attachment portion which is bent and connected to an outer peripheral portion of the earth ring main body portion and is attached and fixed to a peripheral surface of the measurement tube. An electromagnetic flowmeter characterized by: (2) The electromagnetic flowmeter according to claim 1, wherein the earth ring is integrally formed by press molding. (3) The electromagnetic flowmeter according to claim 1, wherein the measurement pipe has a lining provided on an inner diameter thereof, and the earth ring is provided on the measurement pipe. It is what constituted.

[0010]

In the above arrangement, when the measuring fluid flows through the measuring tube, an electric signal corresponding to the flow rate of the measuring fluid is extracted from the measuring electrode. Hereinafter, a detailed description will be given based on embodiments.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a main part of an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG.
4 is a side view of FIG. 3, and FIG. 5 is a plan view of FIG. In the figure, the configuration of the same symbol as FIG. 6 represents the same function. Hereinafter, only differences from FIG. 6 will be described.

Reference numeral 11 denotes a lining body 11
2 is a measuring tube provided with 2. Lining body 112
In this case, a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (trade name "PFA") is used. Thus, the tapered portion 113 is provided at the opening of the inner diameter portion 111.

Reference numeral 12 denotes a thin plate-shaped earth ring comprising an earth ring main body 121, an inner diameter portion 122, and a measuring tube mounting portion 123. In this case, a plate material of 0.8 mm or less is employed. The earth ring main body 121 is provided along the side plane of the measurement tube 1 and has a ring shape.

The inner diameter portion 122 is formed on the earth ring main body 12.
1 is bent and connected to the inner diameter portion of
It has an inner diameter D2 larger than 1 and is provided along the surface of the tapered portion 113 to form a ring.

The measuring tube mounting portion 123 is bent and connected to the outer peripheral portion of the earth ring main body 121, and is fixedly mounted on the peripheral surface of the measuring tube 1. In this case, the earth ring 12 is integrally formed by press molding.

In the above configuration, when the measuring fluid 2 flows through the measuring tube 11, an electric signal corresponding to the flow rate of the measuring fluid 2 is extracted from the measuring electrode 5.

As a result, (1) Since the earth ring 12 is formed of a thin plate and the measuring tube mounting portion 123 can be integrally formed, an electromagnetic flow meter capable of greatly reducing material costs and man-hours can be obtained. (2) Since the earth ring 12 can be made of a difficult-to-weld material, it is possible to obtain an electromagnetic flowmeter in which the degree of freedom in selecting the material of the earth ring 12 is improved.

(3) Inner diameter portion 122 of earth ring 12
However, since it is bent along the tapered portion 113 of the measuring tube 11, a sufficient flow area of the fluid to be measured can be secured, and an electromagnetic flowmeter that can secure the reliability of the ground can be obtained. (4) The inner diameter portion 122 of the earth ring 12 is
Is bent along the tapered portion 113 of the above, and has a ring shape, so that an electromagnetic flow meter that can secure a sufficient area of the fluid 2 to be measured in contact with the entire circumference and secure reliability can be obtained.

(5) Inner diameter portion 122 of earth ring 12
Is bent along the tapered portion 113 of the measuring tube 11,
Since it has a ring shape, it is possible to obtain an electromagnetic flowmeter with which the bending strength is improved as compared with a flat plate and the earth ring 12 which is hardly deformed can be obtained. (6) The inner diameter portion 122 of the earth ring 12 has an inner diameter D2 that is larger than the inner diameter D1 of the measurement tube 1, and the tapered portion 113
Is formed along the surface of the measuring fluid 2, and the earth ring 12 provides an electromagnetic flowmeter that does not disturb the flow of the measurement fluid 2.

(7) Since the earth ring 12 can be constituted by a thin plate, an expensive corrosion-resistant material can be easily adopted, and an electromagnetic flowmeter which can be manufactured at low cost can be obtained. (8) If the earth ring 12 is integrally formed by press molding, a more inexpensive electromagnetic flowmeter can be obtained.

(9) The lining body 11 is provided on the inner diameter part.
In the measuring tube 11 provided with the lining 2,
The portion of the measurement ring 2 facing the measurement fluid 2 is an earth ring 12.
, The lining body 112 can be protected from the measurement fluid 2 containing a solid such as a slurry fluid.

In the above embodiment, the earth ring 12 is described as being integrally formed by press molding. However, the present invention is not limited to this. For example, the earth ring 12 may be manufactured by electroforming. Alternatively, the laser beam may be cut and then bent. In short, it may be an integrally formed body made of a thin plate.

[0023]

As described in detail above, the present invention provides
According to the first aspect, (1) Since the earth ring uses a thin plate and the measurement tube mounting portion can be integrally formed, an electromagnetic flowmeter that can greatly reduce material costs and manufacturing steps can be obtained.

(2) Since the earth ring can be made of a difficult-to-weld material, it is possible to obtain an electromagnetic flowmeter having an improved degree of freedom in selecting the material of the earth ring. (3) Since it is bent along the inner diameter portion of the earth ring and the tapered portion of the measurement tube, it is possible to obtain an electromagnetic flowmeter that can secure a sufficient contact fluid area to be measured and ensure the reliability of the ground.

(4) Since the inner diameter of the earth ring is bent along the tapered portion of the measuring tube to form a ring, a sufficient contact fluid area can be secured over the entire circumference.
An electromagnetic flowmeter that can ensure reliability can be obtained. (5) Since the inner diameter of the earth ring is bent along the tapered portion of the measuring tube to form a ring shape, the electromagnetic flowmeter has improved bending strength compared to a flat plate and can obtain an earth ring which is hardly deformed. can get.

(6) The inner diameter of the earth ring has an inner diameter larger than the inner diameter of the measuring tube, and is provided along the surface of the tapered portion to form a ring shape. No electromagnetic flow meter is obtained. (7) Since an earth ring can be formed from a thin plate, an expensive corrosion-resistant material can be easily adopted, and an electromagnetic flowmeter that can be manufactured at low cost can be obtained.

According to the second aspect, (1) Since the earth ring is integrally formed by press molding, an inexpensive electromagnetic flowmeter can be obtained.

According to the third aspect of the present invention, (1) In the measuring pipe having the lining body provided on the inner diameter part, the part of the lining body facing the measuring fluid is covered with the earth ring, so that the slurry fluid The lining body can be protected from such a measurement fluid containing solid matter.

Therefore, according to the present invention, it is inexpensive and
A required material can be freely selected, and an electromagnetic flowmeter capable of realizing a highly reliable earth ring can be realized.

[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 a side view of FIG.

FIG. 3 is a component diagram of FIG. 1;

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a plan view of FIG. 3;

FIG. 6 is an explanatory diagram of a configuration of a conventional example generally used in the related art.

FIG. 7 is a side view of FIG. 6;

[Explanation of symbols]

 2 measurement fluid 4 measurement electrode 11 measurement tube 111 inner diameter portion 112 lining body 113 taper portion 12 earth ring 121 earth ring main body 122 inner diameter portion 123 measurement tube mounting portion

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01F 1/58

Claims (3)

(57) [Claims] 1. An electromagnetic flowmeter provided with a tapered portion at an inner diameter opening of a measuring tube, wherein a ring-shaped earth ring main body provided along a side plane of the measuring tube and an inner diameter of the earth ring main body are provided. A bent inner portion having an inner diameter larger than the inner diameter of the measuring tube, and being bent along a surface of the tapered portion and an outer peripheral portion of the earth ring main body. An electromagnetic flowmeter, comprising: a thin plate-shaped earth ring integrally formed with a measuring pipe mounting portion connected to and fixed to a peripheral surface of the measuring pipe. 2. The electromagnetic flowmeter according to claim 1, wherein said earth ring is formed integrally by press molding. 3. The electromagnetic flowmeter according to claim 1, wherein the measurement pipe has a lining provided on an inner diameter thereof, and the earth ring is provided on the measurement pipe.