JPS59198318A - Electromagnetic flow meter - Google Patents

Abstract

PURPOSE:To effect positively liquid sealing in an electrode mounting position, by installing a portion devoid of lining on two dielectric reinforcement members immersed in lining. CONSTITUTION:A reinforcement 2 member 11 perforated with many through holes 12 consists of two conductive members not contacting with each other and they are immersed in lining of a measuring pipe 1. An unlined portion 13 is installed in a position corresponding to insertion hole of electrode 5 on its surfaces on two sides. The outer surface 14 and inner surface 15 of this portion 13 are contacted with an end of the electrode 5 and fluid subject to measurement in the pipe respectively, and thus an electro-motive forces produced in individual points of the fluid subjected to measurement can be detected from the portion 13. As the reinforcement member 11 contacting the electrode 5 is free from lining, liquid sealing at the electrode mounting position 2 can be assured positively.

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 measuring tube used in an electromagnetic flowmeter is lined with an insulating material.

Figure 1 shows a conventional electromagnetic flowmeter. This will be briefly explained based on the figure. In the figure, reference numeral 1 denotes a measurement tube through which the fluid to be measured flows, and an electrode mounting portion is located at the center of the outer circumferential surface. 2
is installed protrudingly. This electrode attachment part 2 has the measurement tube 1
An electrode insertion hole 3 penetrating therein is bored. Reference numeral 4 denotes a lining made of polytetrafluoroethylene 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. Reference numeral 5 denotes a flange m with a flange 5a, which is attached to the electrode insertion hole 3 through the lining 4 so that one end comes into contact with the fluid to be measured, and the other end is protruded to the outside to prevent the occurrence of occurrences at various points in the fluid to be measured. Configured to detect power. 6 is a plate having a through hole 7 in the center;
The upper end of the electrode 5 is inserted through the flange 5.
a with a spring 8 interposed between the electrode mounting portion 2
is attached to.

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

[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 with reference to embodiments shown in the drawings.

〔Example〕

FIG. 2 is a sectional view showing an electromagnetic flowmeter according to the present invention.

FIG. 3 is a perspective view showing the reinforcing member. In Figures 2 and below, the same members as in Figure 1 are designated by the same reference numerals.
Detailed explanation 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 portions 13 that do not cover the lining 4 at positions corresponding to the electrode insertion holes 3 on the front and back surfaces. This portion 13 has one end of the electrode 5 on the outer surface 14 and the inner surface 15, respectively.

The electromotive force generated at each point in the fluid to be measured in the pipe is detected from the uncoated portion 13 of the lining that comes into contact with the fluid to be measured in the pipe.

To form the measuring tube 1 constructed in this way, first, two reinforcing members 11 are formed as shown in FIG. Next, the non-perforated portions 11, which are the front and back surfaces of the reinforcing member 11. The reinforcing member 11 is inserted into the measuring tube 1 so that the reinforcing member 11 faces the electrode insertion hole 3. After covering the reinforcing member 11 by molding, the non-perforated portion 11aV? Remove the lining 4 covering the position corresponding to the electrode insertion hole 3 in J4. 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. As shown, two plates are formed in a spiral shape, and the other is shown in the same figure (B).

It may be formed into a cylindrical shape as shown in (C). 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. There is no problem even if it is. .

Furthermore, when covering the reinforcing member 11 with the lining 4,
If the front and back surfaces of the reinforcing member 11 at positions corresponding to the electrode insertion holes 3 are sandwiched between metal pieces in advance, the lining 4
After coating, there is no need to remove the electrode 5 and the lining 4 in the portion that contacts the fluid to be measured.

〔Effect of the invention〕

As explained above, according to the present invention, a reinforcing member buried in the lining is provided with a portion not covered with the lining at a position corresponding to the electrode insertion hole on the front and back surfaces of two conductive members that do not contact each other. Since the electrode is brought into contact with the outer surface of the electrode, the liquid seal at the electrode mounting portion can be reliably maintained. Furthermore, 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]

Fig. 1 is a sectional view showing a conventional electromagnetic flowmeter, Fig. 2 is a sectional view showing an embodiment of an electromagnetic flowmeter according to the present invention, Fig. 3 is a perspective view showing a reinforcing member, and Fig. 4 is a cross-sectional view showing an embodiment of an electromagnetic flowmeter according to the present invention. ). (B) and (C) are side views showing other embodiments. 1... Measuring tube, 3... Electrode insertion hole, 4...
Lining, 5...electrode, 11...reinforcing member,
13...Lining non-covered part, 14...Outer surface. Patent applicant: Yamani-no-Newel Co., Ltd. Agent: Masaki Yamakawa (and one other person)

Claims (1)

[Claims] 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 the lining, the reinforcing member is formed of two conductive members that do not touch each other, and both of these An electromagnetic flowmeter characterized in that a portion not covered with a lining is provided on the front and back surfaces of the conductive member 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.