JPH0229169B2 - DENJIRYURYOKEI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electromagnetic flowmeter equipped with a measuring tube in which a reinforcing member is embedded within a lining.

[Prior art]

The measurement tube used in an electromagnetic flowmeter is lined with a lining made of an insulating material. Figure 1 shows a conventional electromagnetic flowmeter, and this will be briefly explained based on the figure. Reference numeral 1 denotes a measurement tube through which a fluid to be measured flows, and an electrode mounting portion 2 is provided protruding from the center of the outer peripheral surface. This electrode mounting portion 2 is provided with an electrode insertion hole 3 that penetrates into the measurement tube 1 . Reference numeral 4 denotes a lining made of tetrafluoroethylene resin or the like, which covers the inner wall of the measuring tube 1, the wall of the electrode insertion hole 3, and the end surface of the electrode mounting portion 2. 5 is an electrode with a flange 5a;
One end is attached to the electrode insertion hole 3 via a lining 4 so as to be in contact with the fluid to be measured, and the other end is configured to protrude outside to detect the electromotive force generated at each point of the fluid to be measured. ing. Reference numeral 6 denotes a plate having a through hole 7 in the center, through which the upper end of the electrode 5 is inserted and the flange 5 is inserted.
It is attached to the electrode attachment part 2 with a spring 8 interposed between it and the electrode attachment part 2a.

However, in conventional electromagnetic flowmeters, the electrode insertion hole 3 moves due to deformation due to thermal expansion of the lining.
There is a disadvantage that it becomes difficult to maintain the liquid seal of the electrode attachment part 2.

[Summary of the invention]

The present invention was made in view of the above circumstances, and focuses on a reinforcing member buried in the lining for reinforcing the measuring tube, and forms this reinforcing member with two conductive members that are not connected to each other. The object of the present invention is to provide an electromagnetic flowmeter that can reliably seal the liquid at the electrode mounting portion by using an extremely simple structure in which portions not covered with lining are provided on the front and back surfaces of the conductive member. Hereinafter, the configuration and the like will be explained in detail by referring to embodiments shown in the drawings.

〔Example〕

FIG. 2 is a sectional view showing an electromagnetic flowmeter according to the present invention, and FIG. 3 is a perspective view showing a reinforcing member. Second
In the following figures, the same members as in FIG. 1 are denoted by the same reference numerals, and detailed explanations will be omitted. In the figure, a reinforcing member indicated by the reference numeral 11 has a large number of through holes 12, is formed of two conductive members that do not contact each other, and is embedded in the lining 4. This reinforcing member 11 is for reinforcing the measuring tube 1, and has a portion 13 not covered with the lining 4 at a position corresponding to the electrode insertion hole 3 on the front and back sides.
is provided. The outer surface 14 and inner surface 15 of this portion 13 are in contact with one end of the electrode 5 and the fluid to be measured in the pipe, respectively, and an electromotive force is generated from this lining-uncovered portion 13 at each point of the fluid to be measured in the pipe. is detected.

To form the measuring tube 1 configured in this way, first, as shown in FIG.
form. Next, the reinforcing member 11 is inserted into the measuring tube 1 so that the non-perforated portion 11a, which is the front and back surfaces of the reinforcing member 11, faces the electrode insertion hole 3. and,
After covering the reinforcing member 11 by molding,
The lining 4 covering the position corresponding to the electrode insertion hole 3 in the non-perforated portion 11a is removed. In this way, a measuring tube 1 that is robust against external pressure can be obtained.

In this embodiment, the reinforcing member 11 is formed into a cylindrical shape from two rectangular plates, but the present invention is not limited to this, and as shown in FIG. 4A. It may be formed by forming two plates in a spiral shape as shown, or it may be formed into a cylindrical shape as shown in B and C of the figure. That is, in short, any material can be used as long as it is formed of two conductive members as the reinforcing member 11 and a portion 13 that does not cover the lining 4 is provided at a position corresponding to the electrode insertion hole 3 on the front and back surfaces of both conductive members. It doesn't matter if it's something.

Furthermore, when covering the reinforcing member 11 with the lining 4, if the front and back surfaces of the reinforcing member 11 at the positions corresponding to the electrode insertion holes 3 are sandwiched between metal pieces in advance, the electrodes 5 and the fluid to be measured can be removed after the lining 4 is covered. There is no need to remove the lining 4 at the part that comes into contact with it.

〔Effect of the invention〕

As explained above, according to the present invention, the reinforcing members buried in the lining are not brought into contact with each other.
By providing an uncovered portion of the lining at the position corresponding to the electrode insertion hole on the front and back surfaces of the two conductive members, and contacting the electrode with the outer surface of this portion, the liquid seal at the electrode mounting portion can be reliably maintained. can. Further, since the reinforcing member maintains close contact between the lining and the measuring tube, peeling of the lining can be prevented.

[Brief explanation of drawings]

Figure 1 is a sectional view showing a conventional electromagnetic flowmeter, Figure 2
The figure is a sectional view showing one embodiment of the electromagnetic flowmeter according to the present invention, FIG. 3 is a perspective view showing a reinforcing member, and FIGS. 4A, B, and C are side views showing other embodiments. DESCRIPTION OF SYMBOLS 1... Measuring tube, 3... Electrode insertion hole, 4... Lining, 5... Electrode, 11... Reinforcement member, 13...
... Lining non-covered portion, 14... Outer surface.

Claims (1)

[Claims] 1. In an electromagnetic flowmeter equipped with a measuring tube in which an electrode is installed in an electrode insertion hole penetrating the tube and a reinforcing member is embedded in a lining, the reinforcing member is formed of two conductive members that do not touch each other, and
An electromagnetic flowmeter characterized in that a portion not covered with a lining is provided on the front and back surfaces of both conductive members at a position corresponding to the electrode insertion hole, and the electrode is brought into contact with the outer surface of the portion not covered with the lining.