JPS58809Y2 - electromagnetic flowmeter detector - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic flowmeter, in particular, a pair of electrodes installed opposite to each other in a non-magnetic conduit, and a line connecting the pair of electrodes and a line perpendicular to the axis of the conduit. The present invention relates to an electromagnetic flowmeter detector having an excitation coil that applies a magnetic field, and a magnetic outer casing that has flanges at both ends and forms a return path for magnetic flux.

When using this type of electromagnetic flowmeter detector with a cast metal outer casing or a non-magnetic conduit made of a material that cannot withstand thermal stress, such as resin, the conduit cannot be cast or welded into the outer casing.
Both must be inserted and fitted.

In this case, in order to absorb thermal or mechanical stress between the outer casing and the conduit, the fitting of the two forms a mechanical relief in the axial direction of the conduit, and an O-ring or the like is interposed to maintain airtightness. .

However, such a structure not only does not provide sufficient airtightness, but also has the disadvantage that mechanical strength is weakened, and assembly work is complicated.

In order to eliminate the above-mentioned drawbacks, the present invention provides an electromagnetic flowmeter detector in which a conduit is fitted and inserted into a magnetic outer casing. By forming a groove, inserting a cushioning material into the groove, and lining the groove, it is possible to achieve good airtightness and to sufficiently absorb thermal or mechanical stress between the conduit and the outer casing. An object of the present invention is to provide an electromagnetic flowmeter detector that can reduce assembly man-hours by integrally forming a buffer material and a lining material from the same material.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, numeral 10 denotes a non-magnetic conduit, which is fitted and inserted into the inside of a magnetic outer casing 11 which also serves as an iron core.

This outer casing 11 is in substantially close contact with the conduit 10 except for the housing portion 11a of the excitation coil 12, and has flanges 11b made of the same material as the outer casing 11, for example, at both ends.

11b are integrally formed.

Moreover, the excitation coil housing portion 11 is formed by the outer casing 11 itself.
An opening 11C is provided on the upper side of the storage section 11a so that the excitation coil 12 can be attached from the outside of the outer casing 11, and this opening 11C is a magnetic cover 1 that constitutes a return magnetic path section.
1d.

Therefore, the magnetic coil 12 is stored in the excitation coil storage part 11a from the outside of the outer casing 11, and then
If the opening 11C of a is closed with the lid 11d, the attachment of the excitation coil 12 to the flowmeter detector body is completed.

In addition, when the lid body 11d is closed, the excitation coil storage part 11
To maintain airtightness with C, an O-ring seal 13 is placed between the two.
is intervening.

On the other hand, the inside of the conduit 10 is lined with an electrical insulator 1.
4 is applied, and a pair of electrodes 15 and 15 are placed facing each other so that the conduit 10 and the lining 14 are passed through and the electrode heads are exposed inside the lining 14.

Thereby, the induced electromotive force obtained when the magnetic flux generated by the excitation coil 12 acts perpendicularly on the fluid to be measured can be extracted as a flow rate signal of the fluid to be measured by the pair of electrodes 15,15.

In addition, openings 11 e and 11 e are provided at both ends of the outer casing 11, that is, on the sides of the outer casing 11 located on the axes of the pair of electrodes, to make it convenient for mounting the electrodes 15 and 15 and for maintenance and inspection. .

The openings 11e, 11e are closed by the electrode lid 11f.

In this case as well, the O-ring packing 16 maintains airtightness.

Note that after the lids 11 d and 11 f are closed, they may be welded or screwed to the outer casing 11.

Furthermore, the lid body may be provided with introduction and extraction holes for an excitation power supply line and a signal output line.

Further, the excitation coil 12 may be directly stored in the storage part 11a, or it can be fixed to the lid 11d and stored in the storage part 11a when the lid 11d is closed.

2 to 5 are enlarged partial cross-sectional views of portion A in FIG. 1a.

A circumferential groove 11g is formed on the inner surface of the outer casing at the boundary where the end of the conduit 10 contacts the outer casing 11, and a buffer material 1 is placed inside the circumferential groove 11g.
7 is inserted.

In these embodiments, the lining 14 is made of rubber, and the cushioning material 17 is made of the same rubber as the lining.

The lining 14 is formed not only over the conduit 10 but also over the flange 11b.

By inserting the buffer material 17 into the circumferential groove 11g in this manner, it is possible to provide relief from thermal and mechanical stress in the outer casing 10, without causing damage to the conduit 10, and with sufficient airtightness. It has the advantage of being maintained.

Furthermore, if the cushioning material 17 is formed integrally with the lining material from the same material, there is an advantage that the work is simpler and the number of man-hours and parts can be reduced.

Furthermore, if the circumferential groove 11g is formed into a dovetail shape as shown in FIGS. 2, 3, and 5, there is an advantage that when stress is applied to the cushioning material 17, the inner surface of the lining 14 in that area is less likely to bulge. There is a conduit 10 as shown in Figures 4 and 5.
If the edge reaches the middle of the circumferential groove 11g, there is an advantage that airtightness can be improved.

Further, if a circumferential groove 14a is similarly formed in the lining 14 at the circumferential groove 11g as shown in FIG. 5, the stress can be more fully absorbed.

According to the present invention, the cushioning material 17 and the lining 14 are preferably formed by pasting raw rubber with an adhesive or the like and vulcanizing it, but in the case of liquid rubber, they can also be formed by molding.

As the conduit, glass fiber reinforced epoxy resin, glass fiber reinforced polyester resin, Bakelite, etc. are suitable, but ceramic, cement, asbestos, or metal pipes such as stainless steel can also be used.

[Brief explanation of the drawing]

Figures 1a and 1) are partially sectional side views and partially sectional front views of the electromagnetic flowmeter detector according to the present invention, and Figures 2 to 5 are enlarged views of section A in Figure 1a, respectively. FIG. 10...Nonmagnetic conduit, 11...Magnetic outer casing, 12...Excitation coil, 14...
Lining, 15... Electrode, 11 g...
...Circumferential groove, 17...Buffer material.

Claims (2)

[Scope of utility model registration request] (1) A pair of electrodes installed opposite to a non-magnetic conduit, an excitation coil that applies a magnetic field perpendicular to a line connecting the pair of electrodes and the axis of the conduit, and flanges at both ends. In an electromagnetic flowmeter detector having a magnetic outer casing that forms a return path for magnetic flux, the conduit is fitted and inserted into the outer casing, and the inner surface of the conduit has electrical insulation across the flange of the outer casing. A lining is provided, and a circumferential groove is formed on the inner surface of the outer casing at the boundary where both ends of the conduit contact the outer casing, and a cushioning material is inserted into the groove. Electromagnetic flow meter detector. (2) The electromagnetic flowmeter detector according to claim 1, wherein the buffer material is made of the same material as the lining and is formed integrally with the lining.