JPH044187Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention is an electromagnetic flowmeter that utilizes Faraday's law of electromagnetic induction, and in particular, an electromagnetic flowmeter that is installed between flanges on the upstream and downstream sides of piping. Concerning a pinch-type electromagnetic flowmeter.

[Prior art and its problems]

In general, electromagnetic flowmeters are based on Faraday's law, which states that the voltage induced in a conductor moving in a magnetic field at right angles to the direction of the magnetic field is proportional to the speed at which the conductor moves. The fluid to be measured forms a continuous fluidic conductor moving in the magnetic field, and the faster the flow, the higher the instantaneous value of the voltage developed between the electrodes. This type of electromagnetic flowmeter is suitable for measuring the flow rate of fluids that are difficult to handle, such as corrosive acids, sewage, and slurries.Since it does not interfere with the flow, it allows stable measurement over a long period of time with low pressure loss. It is possible to measure most liquids that have In particular, the clamp-type electromagnetic flowmeter is small and lightweight for use with small diameters of about 3 mm to 150 mm, and is configured to be clamped into a piping flange, making it easy to handle. FIG. 1 is a schematic configuration diagram of a conventional sandwich type electromagnetic flowmeter, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is a longitudinal cross-sectional view of the same. 1 to 3, a sandwich type electromagnetic flowmeter 1 has a converter or terminal box 2 installed on its upper part, and a flange 3 of a pipe 6.
The flanges 3 are inserted between the flanges 3 by bolts 4 and nuts 5. Further, as shown in FIGS. 2 and 3, the electromagnetic flowmeter 1 is roughly divided into three units: a heart section 7, an upper case section 8, and a lower case section 9. The heart portion 7 includes a tube 10, an insulating material 11 covering the inner peripheral surface of the tube 10, a pair of electrodes 12 installed on the tube 10, and the like.
The upper case part 8 includes an upper case 13, a core 14 installed in this upper case 13, and this core 14.
It has a coil 15 surrounding it. Lower case part 9
has a lower case 16, a core 14A installed in the lower case 16, a coil 15A surrounding the core 14A, and the like. 23 is a mounting base for the converter or terminal block 2 shown in FIG. By the way, in order to assemble this electromagnetic flowmeter 1, the heart part 7 is covered from above and below with the upper case part 8 and the lower case part 9, and the mating surfaces 17 and 18 of the upper case 13 and the mating surfaces 17A and 17A of the lower case 16, 18A are welded together at welding points A and B, respectively, and pipe material 1
0 side plates 19, 19A, both sides 20, 20A of the upper case 13, and both sides 2 of the lower case 16.
1 and 21A at welding points C and D. Furthermore, a space 22 between the upper and lower cases 13 and 16 and the pipe material 10
is filled with an insulating material such as epoxy resin to fix the coils 15, 15A. Such welded joints are relatively long and tend to have a lower structural reliability, and require treatments before and after welding, which increases the number of processing steps. The resin filling work was also complicated, leading to problems such as rising production costs.

[Purpose of invention]

In view of the above-mentioned points, the present invention aims to eliminate the drawbacks of the prior art and provide an electromagnetic flowmeter whose structure is simplified, its manufacture is easy, and its reliability is improved. It is.

[Key points of the idea]

In order to achieve this purpose, the present invention
A main body case with a cylindrical hollow part, a tube material with side plates formed at both ends and an insulating material on the inner circumferential surface equal to the inner diameter of the piping, and an outer circumferential surface of this tube material facing on an axis perpendicular to the flow direction of the fluid to be measured. a pair of cores provided as a core, a pair of coils surrounding the cores, and a pair of electrodes provided facing each other on an axis perpendicular to the flow direction of the fluid to be measured and perpendicular to the cores; and a conduit section integrally fixed, and the conduit section is inserted into a hollow part of the main body case to fixedly connect both side plates of the conduit section and both ends of the main body case. do.

[Example of idea]

Next, embodiments of the present invention will be described in detail based on the drawings.

Figure 4 is a schematic configuration diagram of an embodiment of the present invention;
The figure shows a longitudinal sectional view of FIG. 4. Figures 4 and 5
In the figures, parts having the same functions as in FIGS. 2 and 3 are designated by the same reference numerals. The electromagnetic flowmeter 24 is composed of two units: a main body case 25 and a conduit section 26. The main body case 25 is
Hollow part 27 and mounting base 40 formed in a cylindrical shape
It consists of. The pipe section 26 includes a pipe material 28 and an insulating material 2
9, one pair of electrodes 12, 12A, core 30, 30A
and coils 31, 31A, etc. By the way, this pipe material 28 has side plates 32, 32 on both ends.
A, cores 30, 30A are integrally formed on the outer peripheral surface, an insulating material 29 is provided on the inner peripheral surface, and annular coils 31, 3 provided on the outer peripheral surface of the cores 30, 30A.
Fix 1A respectively. The conduit section 26 configured in this way is inserted into the hollow section 27 of the main body case 25, and is connected to both sides 34, 34A of the main body case 25.
and both side plates 32 and 32A of the tube material 28 are welded together at welding points E and F. Therefore, there are two welding points, E and F, and therefore, the upper and lower cases 13 and 13 as shown in FIGS. 2 and 3 are welded.
Welded joints at mating surfaces 17, 17A, 18, 18A between 16 (total of 4 welds A, B,
I needed C and D. ) is no longer required, and the number of processing steps can be reduced by reducing the number of welding locations.
In addition, cores 30, 30A and coils 31, 31
Since the coils A are installed on the outer circumferential surface of the tube material 28, there is no need to specifically fill the coils 31 and 31A with a resin material in order to further fix the coils 31 and 31A.

Next, FIG. 6 shows a schematic diagram of another embodiment of the present invention. In the figures, parts having the same functions as those in FIGS. 4 and 5 are given the same reference numerals. Annular grooves 37 and 37A are provided on the outer peripheral surfaces of both side plates 36 and 36A of the tube material 35, and the annular grooves 3
O-rings 38, 38A are inserted into 7, 37A. The tube material 35 is inserted into the main body case 25, kept airtight by O-rings 38 and 38A, and a set screw 39 is provided at the side end of the main body case 25 to fix the main body case 25 and the tube material 35. These O-rings 38, 38A and set screws 39 eliminate the need for welding and reduce the number of machining steps shown in Figures 4 and 5.
It is further reduced compared to the figure.

[Effect of idea]

As explained above, according to the present invention, there is provided a main body case having a cylindrical hollow part, a pipe material having side plates formed at both ends and having an insulating material on the inner peripheral surface equal to the inner diameter of the pipe, and a fluid flowing on the outer peripheral surface of the pipe material. A conduit section in which a pair of cores and a pair of coils facing each other on an axis perpendicular to the flow direction of the core and a pair of electrodes facing each other on another axis perpendicular to the cores are integrally fixed. By inserting this conduit into the hollow part of the main body case and fixing both sides to the main body case, the structure is simplified, manufacturing is easier, the number of processing steps is reduced, and its reliability is improved. It has advantages such as:

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a conventional insert type electromagnetic flowmeter, Fig. 2 is a cross-sectional view of Fig. 1, Fig. 3 is a longitudinal sectional view of Fig. 1, and Fig. 4 is a schematic diagram of an embodiment of the present invention. FIG. 5 is a longitudinal sectional view of FIG. 4, and FIG. 6 is a schematic diagram of another embodiment of the present invention. 24...Pinch type electromagnetic flowmeter, 25...Body case, 26...Pipe line section, 28...Pipe material, 29...
...Insulating material, 30,30A...Core, 31,31A
... Coil, 37, 37A ... Annular groove, 38, 3
8A...O-ring, 39...Set screw, E, F...
...Welding points.

Claims (1)

[Scope of utility model registration request] In an electromagnetic flowmeter that is sandwiched between flanges on the upstream and downstream sides of piping through which the fluid to be measured flows, the main body case has a cylindrical hollow part, and the inner periphery has side plates at both ends. A tube material having an insulating material equal to the inner diameter of the pipe on its surface, a pair of cores provided on the outer peripheral surface of the tube to face each other on an axis perpendicular to the flow direction of the fluid to be measured, and a pair surrounding this core. and a conduit section in which a coil and a pair of electrodes provided facing each other on an axis perpendicular to the flow direction of the fluid to be measured and perpendicular to the core are integrally fixed, the conduit section An electromagnetic flowmeter characterized in that a part is inserted into a hollow part of the main body case to connect both side plates of the conduit part and both ends of the main body case.