JPH068499Y2 - Electromagnetic flow meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electromagnetic flow meter.

More specifically, it relates to an electrode structure of an electromagnetic flow meter.

<Prior Art> FIG. 5 is an explanatory view of a configuration of a conventional example that is generally used in the past.

In the figure, 1 is a measuring tube, 11 is an insertion hole for an electrode provided in the measuring tube 1, 12 is a counterbore hole provided from the outside of the measuring tube in the insertion hole, and 2 is arranged with a gap in the insertion hole 11. The columnar electrode 21 is an electrode seat attached to one end of the electrode and is made of the same material as the plastic lining. Reference numeral 3 is an insulating collar arranged in the gap between the insertion hole 11 and the electrode 2. Reference numeral 4 is a nut attached to one end of the electrode 2 via an insulating seat 41 and a washer 42. Reference numeral 5 is a lining made of a plastic material lined on the inner surface of the measuring tube.

<Problems to be Solved by the Invention> However, in such a device, due to the difference in thermal expansion coefficient between the electrode 2 and the electrode seat 21, the sealing property of the electrode portion with respect to the temperature change deteriorates.

Alternatively, the position of the electrode 2 is displaced due to the fluctuation of the measurement pressure.

<Purpose of Invention> The present invention solves this problem.

An object of the present invention is to provide an electromagnetic flowmeter having an electrode portion that is robust and has a good sealing property.

<Means for Solving the Problems> In order to achieve this object, the present invention is directed to an electromagnetic flowmeter in which a plastic is lined on the inner surface of a measuring tube.
An insertion hole for the electrode provided in the measuring tube, a cylindrical metal sponge body fixed around the insertion hole and the columnar electrode and the peripheral surface of the electrode, or the insertion hole. An electromagnetic flowmeter comprising: an electrode portion made of a columnar metal sponge body itself, which is arranged so as to keep the metal sponge body; Is configured.

<Operation> In the above configuration, the metal sponge body is wrapped around the peripheral surface of the columnar electrode arranged with a gap in the insertion hole and fixed,
Alternatively, they are arranged with a gap in the insertion hole. Since the lining body fills the gap between the insertion hole and the electrode and is impregnated in the metal sponge body, the lining body is three-dimensionally fixed to the metal sponge body.

Hereinafter, detailed description will be given based on examples.

<Embodiment> FIG. 1 is an explanatory view of a main part configuration of an embodiment of the present invention.

In the figure, the same symbols as those in FIG. 5 represent the same functions.

Only parts different from FIG. 5 will be described below.

Reference numeral 6 denotes an electrode portion including an electrode 61 and a metal sponge body 62.

The electrode 61 is arranged in the insertion hole 11 with a gap, and has a columnar shape.

The metal sponge body 62 encloses the peripheral surface of the electrode 61 and is welded and fixed to form a tubular shape. In this case, Celmet (= trade name manufactured by Sumitomo Electric Industries, Ltd.) is used.

Reference numeral 7 is a metal sponge body provided in the measuring tube 1 and the insertion hole 11.

Reference numeral 8 is a plastic lining body that fills the gap between the insertion hole 11 and the electrode 61 and is impregnated with a metal sponge body.

In the above configuration, the metal sponge body 62 has the insertion hole 11
The columnar electrode 61 is fixed so as to wrap around the peripheral surface of the columnar electrode 61. The lining body 8 is filled in the gap between the insertion hole 11 and the electrode portion 6 and is impregnated in the metal sponge body 62.
It is dimensionally fixed. Therefore, the lining body 8
Is firmly locked to the metal sponge body 62.

Further, even when stress is applied to the lining body 8 due to changes in the measured fluid pressure and temperature, the metal sponge body 62
Since the lining body 8 is three-dimensionally reinforced, the stress can be three-dimensionally buffered.

As a result, the electrodes can be fixed and sealed at the same time, and a mechanical seal such as an O-ring is not used. Therefore, liquid leakage and displacement are small, and a fixing spring or the like is not required. Also,
The stress due to the difference in thermal expansion between the measuring tube 1 and the lining body 8 is
It is relaxed at the portion where the metal sponge body 62 is impregnated with the lining body 8. In addition, for fixing, the metal sponge body 6
Since the adhesive strength between 2 and the lining body 8 and the mechanical anchor effect are utilized, it is more advantageous than the conventional adhesive in terms of sealing property and strength.

FIG. 2 is an explanatory view of the essential structure of another embodiment of the present invention.

In this embodiment, the electrode 61 is not used, and the columnar metal sponge body 63 is directly used as the electrode.

The electrode 61 is not required and the cost can be reduced.

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

In this embodiment, the electrode portion 6 is impregnated with the lining body 8 and then placed in the insertion hole 11.

The work of impregnating the electrode portion 6 with the lining body 8 becomes easy, and the electrode portion 6 can be manufactured at a lower cost.

FIG. 4 is an explanatory view of the essential structure of another embodiment of the present invention.

In this embodiment, the porosity of the metal sponge body 64 is gradually reduced from the outer side to the inner side in the radial direction (direction of arrow A in the figure).

The substantial coefficient of thermal expansion gradually changes, and the lining body 8
However, it is more difficult to peel off.

<Effects of the Invention> As described above, the present invention is an electromagnetic flowmeter in which the inner surface of the measuring tube is lined with plastic, and the gap between the insertion hole of the electrode provided in the measuring tube and the insertion hole is maintained. And a cylindrical metal sponge body fixed around the peripheral surface of the electrode or the cylindrical metal sponge body arranged with a gap in the insertion hole, and the insertion hole. And a plastic lining body that fills a gap between the electrode and the metal sponge body and is impregnated in the metal sponge body.

In the above structure, the metal sponge body is fixed by wrapping the peripheral surface of the columnar electrode arranged in the insertion hole with a gap. Alternatively, the metal sponge body itself is arranged in the insertion hole with a gap. Since the lining body fills the gap between the insertion hole and the electrode portion and is impregnated in the metal sponge body, the lining body is three-dimensionally fixed to the metal sponge body. Therefore, the lining body is firmly locked to the metal sponge body.

Further, even when stress is applied to the lining body due to changes in the measured fluid pressure or temperature, the metal sponge body three-dimensionally reinforces the lining body, so that the stress can be three-dimensionally buffered. I can.

As a result, the electrodes can be fixed and sealed at the same time, and a mechanical seal such as an O-ring is not used. Therefore, liquid leakage and displacement are small, and a fixing spring or the like is not required. Also,
The stress due to the difference in thermal expansion between the measuring tube and the lining body is relieved at the portion where the metal sponge body is impregnated with the lining body. In addition, because it uses the adhesive strength between the metal sponge body and the lining body and the mechanical anchoring effect for fixing, it is advantageous in terms of sealing property and strength over the case of using a conventional adhesive material. Is.

Therefore, according to the present invention, it is possible to realize an electromagnetic flowmeter having an electrode portion which is robust and has a good sealing property.

[Brief description of drawings]

FIG. 1 is an explanatory view of the essential parts of one embodiment of the present invention, FIG. 2 is an explanatory view of the essential parts of another embodiment of the present invention, and FIG. 3 is an essential part of another embodiment of the present invention. FIG. 4 is an explanatory view of the structure of the main part of another embodiment of the present invention, and FIG. 5 is an explanatory view of the structure of a conventional example that is generally used in the related art. 1 ... Measuring tube, 11 ... Insertion hole, 6 ... Electrode part, 61 ...
... Electrodes, 62, 63, 64, 7 ... Metal sponge body, 8
...... Lining body.

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic flowmeter in which a plastic is lined on an inner surface of a measuring tube, an insertion hole of an electrode provided in the measuring tube, a columnar electrode arranged with a gap in the insertion hole, and the electrode. A cylindrical metal sponge body wrapped around the peripheral surface or an electrode portion made of a columnar metal sponge body itself arranged with a gap in the insertion hole, and filling the gap between the insertion hole and the electrode An electromagnetic flowmeter comprising: a metal sponge body and a plastic lining body.