JPH03138531A - Electromagnetic flowmeter - Google Patents

Abstract

PURPOSE:To miniaturize the flowmeter and to reduce the cost by incorporating an electromagnet coil in insulating lining provided in a measurement tube in one body, and exposing the contact of the electromagnet coil from the hole of the measurement tube, and connecting it to an external lead line. CONSTITUTION:Patterns 13a and 13b of the coil of the electromagnet are incorporated in two opposite parts of the insulating lining 12 in one body. Then the measurement pipe 11 is interposed in part of piping where the electromagnetic flowmeter is expected to be used and the external lead line is connected to the contact 14 through the hole 15. Then energized through the contact 14 to produce an alternating magnetic field in the measurement tube 11 and a voltage which is developed intersecting the AC magnetic field at right angles is measured through a voltmeter to find the flow rate of fluid. Thus, the device is miniaturized.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to an electromagnetic flowmeter.

(Prior Art) As a widely used electromagnetic flowmeter for measuring fluid flow rate, one having a configuration as shown in FIG. 4 is known.

This conventional electromagnetic flowmeter has a heat-resistant and corrosion-resistant lining 2 on the inner surface of a measuring tube 1 inserted in a part of a fluid flow path, and an alternating line inside the measuring tube 1 on the outside. It had a configuration in which an electromagnetic coil 3 for forming a magnetic field was arranged.

(Problems to be Solved by the Invention) However, in such conventional electromagnetic flowmeters, a large space is required to mount the electromagnetic coil on the outside of the measuring tube, and insulation needs to be taken into account. There is a problem in that an increase in the size of the device is unavoidable, and as the device becomes larger, the cost also increases.

This invention was made in view of these conventional problems, and provides an electromagnetic flowmeter that can reduce the size and cost of the device by integrating the electromagnetic coil with the lining inside the measuring tube. The purpose is to provide.

[Structure of the Invention] (Means for Solving the Problems) The electromagnetic flowmeter of the present invention includes an insulating lining that includes and integrates a pattern of contacts and an electromagnetic coil on the inner surface of a measuring tube, and connects the contacts to an external It is exposed to the outside through a hole in the measuring tube so that it can be connected to a lead wire.

(Function) In the electromagnetic flowmeter of the present invention, the electromagnetic coil and its contacts are contained in the insulating lining provided on the inner surface of the measuring tube,
By exposing the contact part to the outside through the hole formed in the measuring tube, there is no electromagnetic coil outside the measuring tube, and by connecting the external lead wire to the contact through the hole in the measuring tube, the electromagnetic coil can be removed. can generate the alternating magnetic field necessary to measure the flow rate of the fluid flowing in the measuring tube. .

(Example) Hereinafter, embodiments of the present invention will be explained in detail based on the drawings.

1 to 3 show an embodiment of the present invention, in which an insulating lining 12 made of an insulating synthetic resin with high heat resistance such as polyamide is provided on the inner surface of a measuring tube 11. It is a provision.

Electromagnetic coil patterns 13a and 13b are integrated into two opposing parts of the insulating lining 12, that is, at the top and bottom when installed at an actual site, by molding or other methods. The electromagnet coil pattern 13a is provided with a contact point 14 for connecting an external lead wire later.

A hole 15 is formed in the upper center of the measuring tube 11, and an external lead wire is connected to the contact point 4 through this hole 15.

As shown in FIG. 3, the insulating lining 12 is formed by forming an electromagnetic coil pattern 13a on the outer surface of a polyamide plate.
13b by molding or other methods, roll it into a tube shape, abut both end edges, and attach the abutted edges by heat fusion, gluing, or other methods to form a tube body. It is integrated with the measuring tube 11 by inserting it inside and sealing it by tightening both ends with earth rings (not shown).

Also, the lining 12 is arranged so that the contact 14 of the electromagnetic coil pattern 13a is located at the position of the hole 15 of the measurement tube 11.
alignment is being performed.

Next, the operation of the electromagnetic flowmeter having the above configuration will be explained.

When using this electromagnetic flowmeter, the measuring tube 11 is inserted into a part of the piping in which the electromagnetic flowmeter is to be used, and an external lead wire is connected to the contact 14 through the hole 15. Then, by supplying power through this contact 14, an alternating magnetic field is formed in the measuring tube 11, and the voltage generated in the direction perpendicular to this alternating magnetic field is measured through a voltmeter (not shown), and a predetermined conversion is performed. The fluid flow rate is determined through the formula.

Note that the present invention is not limited to the above-described embodiments, and heat-resistant and corrosion-resistant synthetic resins such as polyethylene and polypropylene or natural materials can be freely used instead of polyimide for the insulating lining 12. can.

[Effects of the Invention] As described above, according to the present invention, the electromagnetic coil is integrated into the insulating lining provided in the measurement tube, and the contact point of the electromagnet coil is exposed through the hole in the measurement tube to connect to the external lead wire. Because they are connected, the electromagnetic coil is not exposed outside the measuring tube as in the conventional case, and the size can be made smaller and costs can be reduced accordingly.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is a plan view of the above embodiment, Fig. 3 is a developed view of the insulating lining used in the above embodiment, and Fig. 4 is a conventional example. FIG. 11... Measuring tube 12... Insulating lining 13a, 13b... Coil pattern

Claims (1)

[Claims] An electromagnetic flowmeter comprising an insulating lining that contains and integrates contacts and an electromagnetic coil pattern on the inner surface of a measuring tube, and exposes the contacts to the outside through a hole in the measuring tube so that they can be connected to an external lead wire.