JPS6025541Y2 - electromagnetic flowmeter detector - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an electromagnetic flowmeter detector.

In a conventional electromagnetic flowmeter detector, for example, as shown in FIG. 1, a rubber lining 3 is provided on the inner surface of a measuring tube 2, and this lining is flared at flanges 1 on both sides.

When the detector is connected to the mating pipe 5 by fastening with bolts or the like, the flare portion 4 serves as a backing between the main body flange 1 and the mating piping flange 4 to prevent leakage of internal fluid. was.

However, with this configuration, when installing the detector, for example, the flare surface may be scratched, the bolts may not be tightened enough, or the bolts may be tightened unevenly. In cases where the centers of the pipes do not match (which often occurs), it is difficult to completely check for defects after assembly in the field, so the existence of the defect is not obvious until fluid is flowing and a leak actually occurs. There was a problem.

In addition, leaks could occur due to aging of parts of the flare or bolts.

Such leakage has been a particular problem, for example, when the fluid contains radioactive materials.

Furthermore, when electromagnetic flowmeter detectors are used in nuclear fuel reprocessing plants, organic materials such as rubber and Teflon, which are highly radioactive and deteriorate significantly due to radioactivity, cannot be used for lining or packing. There was a problem.

An object of the present invention is to provide an electromagnetic flowmeter detector that can completely prevent internal fluid leakage.

FIG. 2 shows an embodiment of the present invention.

In the figure, 2 is a measuring tube made of metal such as stainless steel, 6 is a ceramic lining on the inner surface of the measuring tube, 7 is a mating pipe (or connecting pipe), and 8 is a connection between the measuring pipe 2 and the mating pipe 7. This is the welding part.

Numerals 10 and 11 are a core and a coil, forming a magnetic field generating device that generates a magnetic field within the measuring tube.

Core 10 and coil 11 are protected by case 9.

Additionally, a pair of electrodes (not shown) are provided that penetrate the lining 6 and come into contact with the fluid within the measurement tube.

Both ends of the measuring tube 2 are provided with inner diameter enlarged portions 2a, while
The connecting pipe 7 also has a reduced outer diameter portion 7 corresponding to the enlarged inner diameter portion 2a.
a is provided, and the inner diameter of the inner diameter enlarged part 2a and the outer diameter reduced part 7a
A gap 12 is formed between the outer diameter and the outer diameter.

Although fluid enters this gap 12, no flow occurs;
Fluid stagnates.

The lining 6 is provided not only on the main part 2b of the measuring tube 2 but also on the inner surface of the enlarged inner diameter part 2a, and is located in the gap 12 at the end of the lining 6.

In this way, since the end of the lining 6 is located in the area where the fluid stagnates, the lining end does not peel off.

The end portion of the enlarged inner diameter portion 2 a is welded to the outer surface of the main portion 7 b of the mating pipe 7 by a welding portion 8 .

Since they are joined by welding in this way, leakage is completely prevented.

Furthermore, since the lining is made of ceramic that is resistant to radioactivity, the problem of deterioration due to radioactivity is resolved, and the flowmeter detector can also be used to measure fluids with strong radioactivity.

Note that the lining material may be other than ceramic as long as it is a material that is resistant to radioactivity.

As described above, according to the present invention, since the end of the lining is located in a part where no flow occurs, separation of the lining can be prevented without having to sandwich the end of the lining between the pipes that are connected to each other. The measuring tube can therefore be joined to the mating pipe by welding without problems, so that fluid leakage is completely prevented.

Furthermore, by forming the lining with a material that is resistant to radioactivity, it is possible to prevent the problem of deterioration from occurring even when used for measuring fluids with strong radioactivity.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional electromagnetic flowmeter detector, and FIG. 2 is a sectional view of an electromagnetic flowmeter detector according to an embodiment of the present invention. 2... Measuring tube, 6... Lining, 7
・Bent/connecting pipe, 8...Welded part, 9...
Case, 1o...Core, 11...Coil, 12...Gap.

Claims (1)

[Claims for Utility Model Registration] 1. A measuring tube whose inner surface is lined and through which fluid flows, a magnetic field generating device that generates a magnetic field in the fluid in the measuring tube, and a pair of electrodes in contact with the fluid in the measuring tube. In the electromagnetic flowmeter detector, a fluid stagnation part in which fluid stagnates is formed near an end of the measurement tube, an end of the lining is located in the fluid stagnation part, and the measurement tube An electromagnetic flowmeter detector characterized by being joined to a mating pipe by welding. 2. The electromagnetic flowmeter detector according to claim 1, wherein the lining is made of a material resistant to radioactivity.