JPH0228089B2 - DENJIRYURYOKEI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electromagnetic flowmeter that electrically measures the flow rate of fluid flowing within a measuring tube.

[Prior art]

An electromagnetic flowmeter uses Faraday's electromagnetic induction phenomenon to measure the flow rate of a conductive fluid flowing inside a measurement tube. Therefore, any fluid that has electrical conductivity above a certain level can be measured, and there is a wide variety of objects to be measured. Therefore, corrosion due to fluid,
Various insulating materials are available for lining the inner peripheral wall of the measuring tube in consideration of wear, etc., but with conventional electromagnetic flowmeters, the lining material may no longer be suitable due to changes in the fluid to be measured. If the measuring tube was damaged or worn and the measuring tube needed to be replaced, it was sent back to the manufacturer for replacement.

However, such exchange has a serious drawback in that it takes too much time for the device to be returned to the user, which may impede measurement.

Therefore, an electromagnetic flowmeter as shown in FIG. 1 has already been proposed as a means of solving these drawbacks. This flowmeter consists of a pair of electrodes 1 and 1.
A cylindrical inner tube 3 integrally molded with a saddle-shaped excitation coil 2 and the like is fitted and fixed into the outer tube 4, and its lead wire 5 is connected to the case mounting part 6 provided on the outer circumferential surface of the outer tube 4 to the exchanger case. With this configuration, only the inner tube 3 can be replaced, and if inner tubes with different lining materials are prepared, the user can easily replace the inner tube 3. It has the advantage of being interchangeable. However, in such an electromagnetic flowmeter, the lead wire 5 is guided from the inside of the outer pipe 4 through the case attachment part 6 into the exchanger case 7, so the lead wire 5 is inserted between the inner pipe 3 and the outer pipe 4. The work of passing the wire through is very difficult in terms of space and requires skill, and the lead wire 5 may be damaged or disconnected depending on the condition of the inner tube 3 and outer tube 4 (machining and welding), the way the core is assembled, etc. There are times when I
There is a risk that measurement will become impossible. Therefore, this work requires a lot of time and attention, resulting in a decrease in assembly efficiency and an increase in manufacturing costs.

[Summary of the invention]

The present invention has been made in view of the above-mentioned points, and is an extremely simple method in which a connector is provided on the outer periphery of the inner pipe, and an inner/outside shorting connector inserted through the outer pipe is connected to the connector of the inner pipe. The present invention provides an electromagnetic flowmeter that eliminates the need for internal pipe lead wires and facilitates assembly, replacement, and the like.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 2 is an exploded perspective view showing an embodiment of the electromagnetic flowmeter according to the present invention. In the figure, the same components as in Figure 1 are designated by the same reference numerals.
The explanation will be omitted. In the figure, a female connector 10 is integrally provided at a location on the outer peripheral surface of the inner tube 3 that corresponds to the case attachment portion 6 provided on the outer tube 4, and a pair of terminals of the connector 10 are connected to each other. A lead wire (not shown) of the electrode 1 is connected to each end of the pair of saddle-shaped excitation coils 2 through the inside of the inner tube 3, respectively. Further, a screw hole 11 is formed in the center of this connector 10.
Further, both ends of the inner tube 3 are each formed to have a large diameter so as to have an outer diameter that is approximately the same as the inner diameter of the outer tube 4, and an annular groove (see FIG. ) are formed, and O-rings 20 are fitted respectively. And the inner pipe 3
is fitted into the exterior tube 4 from its axial direction, and then positioned and fixed by a set screw 12 screwed through the exterior tube 4 from below. Although this example shows a case where the electrode 1, saddle-shaped excitation coil 2, etc. are molded on the inner tube 3, these are not necessarily integrally molded and may be incorporated into the inner tube 3. Of course.

A threaded rod 13 is attached to the case mounting portion 6 of the exterior pipe 4.
A male connector 14 for shorting between the inside and outside, which is rotatably fitted and movable in the axial direction, is inserted together with the threaded rod 13, whereby the connection between the male connector 14 and the female connector 10 is immediately established. It will be done. That is, the male connector 14 has a protrusion 1 on its outer peripheral surface.
When the male connector 14 is lowered by fitting the protrusion 15 into an axial fitting groove 16 provided on the inner peripheral surface of the case mounting portion 6, Rotation of the connector 14 is prevented, allowing quick and reliable connection of both connectors 10, 14. At this time, the threaded portion 13A provided at the tip of the threaded rod 13 is screwed into the threaded hole 11, and the threaded rod 13 and the aforementioned set screw 1 are screwed into the threaded hole 11.
2, the inner tube 3 is firmly positioned and fixed at a predetermined position inside the outer tube 4. Further, as the front threaded rod 13 is screwed in, a cylindrical portion 14a integrally provided on the male connector 14 is formed on the lower surface of the knob 13B.
In order to press the upper end surface of the male connector 14
can be reliably connected to the female connector 10. Note that the male connector 14 is connected to the threaded portion 1.
It is prevented from coming off from the threaded rod 13 by the knob 3A and the knob 13B. Further, 17 is a lead wire connecting the male connector 14 and the electric circuit section 8, and the outer pipe 4 and the inner pipe 3 are connected to a main pipe (not shown) through which the fluid to be measured flows.

〔Effect of the invention〕

As described above, the electromagnetic flowmeter according to the present invention has
A connector is provided on the outer periphery of an inner tube equipped with electrodes, excitation coils, etc., the inner tube is fitted and fixed into the outer tube from the axial direction, and an inner/outside shorting connector is inserted through the outer tube and connected to the connector. Since it is configured to do so, it is possible to eliminate the conventionally required work of guiding the lead wire of the inner pipe through the inside of the outer pipe and into the exchanger case, and the workability of assembly, replacement, etc. can be greatly improved. Further, since there is no lead wire, breakage or breakage of the lead wire can be prevented, and a flowmeter that is extremely easy to handle can be provided.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an example of a conventional electromagnetic flowmeter, and FIG. 2 is an exploded perspective view showing an embodiment of the electromagnetic flowmeter according to the present invention. 1... Electrode, 2... Excitation coil, 3... Inner tube, 4... Exterior tube, 10... Connector, 11...
Screw hole, 13... Threaded rod, 14... Connector for internal and external short circuit.

Claims (1)

[Claims] 1. A cylindrical inner tube equipped with electrodes, excitation coils, etc. was fitted and fixed into the outer tube from the axial direction, and an internal/external shorting connector was inserted through the outer tube from the outside and provided on the outer peripheral surface of the inner tube. An electromagnetic flowmeter characterized by being connected to a connector.