JPH02268231A - Measuring pipe for detector of electromagnetic flowmeter - Google Patents

Abstract

PURPOSE:To simplify the structure of a pipe and to facilitate the manufacture of a small- diameter measuring pipe by forming an insulating plate in a pipe shape on which an electrode, contact points and a conductor pattern for connecting the electrode and the contact points are formed, and inserting the insulating plate into a measuring pipe made of nonmagnetic metal. CONSTITUTION:An insulating pipe 2 is formed in a pipe shape by the following way. The patterns of an electrode 3, contact points 4 and a conductor 5 are formed on a polyimide plate 2 by a substrate manufacturing technology. Thereafter, gold, platinum and the like are plated on the surface of the electrode 3. The plate is wound so that the surface having the electrode 3 is located inside. Both ends are fused and connected by ultrasonic fusing and the like so as to form a pipe shape. The positions of the contact points 4 and the position of a lead taking-out hole 1a are aligned, and the insulating pipe 2 is inserted into a measuring pipe 1 and combined. Both ends of the measuring parts 1 which is assembled into the detecting part of an electromagnetic flowmeter are tightened with grounding rings and sealed. The lead wires are connected to the contact points 4. The lead wires are taken out of the measuring pipe 1 through the lead taking-out hole 1a. In this constitution, the electrode 3 and the lining are made to form a unitary body, and the structure is simplified. The measuring pipe having the small inner diameter can be manufactured readily.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Industrial Field of Application) The present invention relates to a measuring tube of an electromagnetic flow meter detector, and in particular to electrodes and linings.

(Prior Art) FIG. 3 shows a measuring tube of an electromagnetic flowmeter detector equipped with an internally inserted electrode conventionally used in a shell. in this case,
Measuring tube (1) with electrode (14) and lining (12)
Insert the spacer (15), spring (16), and nut (17) into the electrode mounting hole (13) from the inside of the tube in 1).
It was a structure that was tightened and held by however,
The electrode is installed from the inside of the measuring tube (11) to the electrode (14).
), if the inner diameter of the measuring tube (11) is small, it is difficult or sometimes impossible to insert the electrode (14). Furthermore, the structure was complicated due to the seal between the electrodes.

(Problems to be Solved by the Invention) In view of the above-mentioned difficulties between conventional electrodes, the present invention aims to simplify the structure by integrating the electrodes and the lining, and allows easy installation even in measuring tubes with small inner diameters. It is an object of the present invention to realize a measuring tube having a space between electrodes that can be adjusted as described above.

[Structure of the invention]

(Means for Solving the Problems) The measuring tube of the electromagnetic flowmeter detector of the present invention has electrodes arranged opposite to each other on the inner surface of the tube, a pair of contacts arranged close to each other on the outer surface of the tube, and a tube wall between them. An insulating tube with a pattern of conductors to be embedded and connected is inserted into a non-magnetic metal measurement tube, and a contact is inserted into the measurement tube through a lead extraction hole that is pre-drilled in alignment with the contact. It is configured to take out the lead wire from the.

(Function) In the measuring tube of the electromagnetic flowmeter detector of the present invention, the insulating tube can be made by winding an insulating plate on which patterns such as electrodes and contacts are formed using substrate manufacturing technology, and fusing both ends of the insulating plate. Since it also serves as a lining and does not require a mechanism for electrode sealing, it has a simple structure and can be easily installed even in measurement tubes with small inner diameters. Therefore, it is possible to reduce the cost of the electromagnetic flowmeter detector, and the insulating tube can be easily replaced and maintenance is also facilitated.

(Example) Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

An embodiment of the present invention is shown in FIGS. 1(a) and 2(b) and FIG. As shown in Figures 1(a) and (b), the measurement tube (
1) is made of a non-magnetic metal, such as stainless steel, and has a lead extraction hole (1a) in the center in the tube axis direction. The insulating tube (2) fitted into the measuring tube (1) is made of polyimide, for example, and a pair of electrodes (3) are disposed facing each other on the inner surface of the tube at the center in the tube axis direction. A pair of contacts (4) are arranged close to each other on the outer surface of the tube about 90° apart in the circumferential direction from the electrodes (4).
3) and each contact (4) are connected by a conductor (5) embedded in the tube wall, respectively.

As shown in Fig. 2, this insulating tube (2) is made by forming patterns of electrodes (3), contacts (4), and conductors (5) on a polyimide plate (2) using board manufacturing technology. electrode(
3) The surface is plated with gold, platinum, etc., and the electrode (3
) is rolled so that the side facing inside is rolled, and both ends are fused using ultrasonic welding to form a tube. This M! Aa tube (2)
is assembled by fitting it into the measuring tube (1) while aligning the contact (4) and the lead extraction hole (1a). The measurement tube (1) built into the electromagnetic flowmeter detector.

Tighten both ends with earth rings to seal as in the conventional method. Connect a lead wire to the contact (4) and pull it out of the measuring tube (1) through the lead extraction hole (1a).

In the measuring tube of the electromagnetic flowmeter detector according to the embodiment of the present invention configured as described above, the electrode (3) and the contact point (4) for drawing out the lead wire are formed as a pattern on a polyimide plate. The structure is such that the electrode (3) is wound with the surface facing inside to form an insulating tube (2), and this insulating tube (2) is fitted inside the measuring tube (1). Since there is no need for a mechanism for electrode sealing, there is no need for an insulating tube (
Since the method 2) also serves as a lining, the structure is simple and it is possible to easily create a measuring tube with a small diameter, which was impossible with conventional internally inserted electrodes. In addition, insulating tube (2
Polyimide, which is the material used in ), has a wide operating temperature range and good chemical resistance, so it functions well as a lining material. Furthermore, compared to internally inserted electrodes, there is no accumulation around the electrode (3), which is advantageous for sanitary specifications. Furthermore, the insulating tube (2) can be easily replaced and maintenance can be simplified. By using the measuring tube of the present invention, it is possible to reduce the cost of an electromagnetic flow meter detector.

In the above embodiment, polyimide was used as the material for the insulating tube (2), but other materials may be used as long as they can be used as a lining in terms of corrosion resistance, heat resistance, etc.

〔Effect of the invention〕

As described in detail above, according to the present invention, the electrodes disposed opposite to each other on the inner surface of the tube, the pair of contacts disposed close to each other on the outer surface of the tube, and the conductors embedded in the tube wall to connect these are formed in a pattern. The formed insulating tube is fitted into a non-magnetic metal measurement tube, and the lead wire from the contact is taken out through a lead extraction hole that is previously drilled in the measurement tube in alignment with the contact. By realizing the measurement tube of the flow meter detector, there is no need for a mechanism for electrode sealing, and the insulating tube also serves as the lining.
The structure is simple, and measurement tubes with small diameters, which were impossible with conventional internally inserted electrodes, can be easily manufactured. In addition, polyimide, which is the material of the insulating tube, has a wide operating temperature range and good chemical resistance, so it functions well as a lining material. Furthermore, compared to internally inserted electrodes, there is no part where accumulation occurs in the electrode layer, which is advantageous for sanitary specifications.

Additionally, the insulating tubes are easy to replace and maintain.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) show a measurement tube of an electromagnetic flowmeter detector according to an embodiment of the present invention, FIG. 1(a) is a longitudinal cross-sectional view, and FIG. 1(b) is a cross-sectional view including electrodes. FIG. 2 is a cross-sectional view showing the state of the insulating tube before winding, and FIG. 3 is a cross-sectional view of the main part of a measuring tube equipped with a conventional internally inserted electrode. 1...Measuring tube 1a...Lead extraction hole 2
...Insulating tube 3...Electrode 4...Contact
5...Conductor agent Patent attorney Norihiro Oko
Husband figure (?) Figure figure

Claims (1)

[Claims] electrodes arranged opposite to each other on the inner surface of the center of the tube, a pair of contacts arranged close to each other on the outer surface of the tube at a distance of approximately 90° in the circumferential direction from the electrodes, and a connection between each of the contacts and each of the electrodes embedded in the tube wall. An insulating tube formed with a pattern of three conductors to be connected is fitted into a non-magnetic metal measuring tube, and the conductor is connected through a lead extraction hole drilled in the measuring tube in alignment with the contact point. A measuring tube for an electromagnetic flowmeter detector with lead wires coming out from the contacts.