JPS6126887Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electromagnetic flowmeter transmitter suitable for a relatively small-diameter device whose lining tube can be easily replaced.

A conventional electromagnetic flowmeter transmitter has a structure in which a tubular body whose inner peripheral surface is lined is attached to a case housing a coil, a core, a terminal, etc. by penetrating it.

FIG. 1 is a vertical cross-sectional view of such a conventional electromagnetic flowmeter transmitter divided along the case dividing plane. In the figure, 1 is a pipe made of non-magnetic stainless steel, 2 is a flange attached to each end of the pipe 1 by welding, and 3 is a bolt hole formed on the flange 2 for inserting a coupling bolt. ,
4 is a lining made of an insulating material such as rubber or synthetic resin formed entirely on the inner peripheral surface of the pipe 1;
5 is a pair of electrodes that penetrate the lining 4 and are insulated from the pipe 1 at a position symmetrical to the pipe axis in the center of the pipe 1; 6 is a pair of electrodes provided to prevent abnormal tightening of the flared portion of the lining 4; A protective ring is attached to the flange 2 with screws, 7 is a mounting piece attached to the outer peripheral surface of the pipe 1 by welding, and 8 is a case body. By screwing the mounting piece 7 to the case body 8, the pipe 1 can be detachably attached to the case body 8. Also, 9 is a case assembly hole, 10
1 is a terminal box formed on the upper part of the case body 8; 11 is a core held within the case body 8 and arranged to face each other vertically via the pipe 1;
2 is a coil wound around the core 11. core 1
1 and the coil 12 constitute a magnetic field generating means, and when an alternating current is passed through the coil 12, a magnetic field is generated in the pipe 1 in which magnetic flux is directed in the vertical direction, as shown by the dotted arrow, for example. When the fluid flowing through the pipe 1 passes through this magnetic field, a voltage is generated between the electrodes 5 according to Farade's law. Since this voltage is proportional to the flow rate of the fluid, the flow rate can be measured from the voltage.

FIG. 2 is a cross-sectional view of FIG. 1. In the figure, 14 is the case lid, 15 is the case assembly hole 9 of the case body 8, and the case assembly hole of the case lid 14.
(not shown) an assembly bolt inserted through the
16 is an assembly nut. By loosening the assembly nut 16 and removing the assembly bolt 15, the case lid 14 can be separated from the case body 8 at the dividing plane A of the plane containing the tube axis as shown by the arrow, and furthermore, the pipe 1 can be easily removed. .

Conventional transmitters have this structure, so if the lining becomes worn or damaged and requires emergency repair at the site where the transmitter is installed, only the lining can be replaced. Since this was not possible, I had no choice but to remove the flanged pipe from the case body and replace it with a pipe that had a good quality lining. In this case, originally it would be necessary to replace only the defective lining, but since forming a lining on the inner surface of the pipe requires special equipment and techniques, it is impossible to do so at the site where the transmitter is installed. Good quality pipes also have to be replaced.
Therefore, since flanged pipes are expensive, they have the disadvantage of increasing repair costs.

This invention was made to eliminate these conventional drawbacks, and its purpose is to:
An object of the present invention is to provide an electromagnetic flowmeter transmitter having a structure in which only the lining can be easily replaced.

In order to achieve such an objective, this invention has a case that is divided into two along a plane containing the tube axis, and a magnetic field generating means for applying a magnetic flux to the fluid to be measured is housed in at least one side of the case. In an electromagnetic flowmeter transmitter that has a flow path through which the measured fluid passes, flange surfaces are formed on the outer surfaces of the case on the inflow and outflow sides of the measured fluid, and bolts are attached to these flange surfaces for coupling with connecting piping. Along with making a hole,
An insulating lining tube was provided that was formed into a cylindrical shape as a flow path, and a pair of electrodes were fixed to the symmetrical part of the tube axis, and a pair of openings were bored in the part that was held in the case and corresponded to the electrodes. The outer peripheral surface of the lining tube is held between reinforcing plates, and the end of the lining tube is flared outward at the flange surface of the case and connected to the pipe.

This invention will be explained in detail below based on the drawings.

Fig. 3 is a vertical sectional view of one embodiment of the electromagnetic flowmeter transmitter according to this invention, divided by the case dividing plane;
The figure is a side view. In Fig. 3, 20 is a cylindrical lining tube made of an insulating material and has flares at both ends, 21 is a protective ring provided at both ends of the lining tube, and 22 is a horizontal line of the lining tube 20 that is symmetrical to the tube axis. A pair of electrodes (only one is shown) provided in the direction, 23 is the case body with the case divided, 24 is a case assembly for inserting the assembly bolt when assembling the case body 23 with the case lid. hole,
25a is a flange surface formed on the outer surface of the fluid inflow side (left side in the figure) of the case body 23; 26a;
27a is a flange surface formed on the fluid outflow side (right side in the figure) of the case body 23, and 27a is the lining tube 2 held within the case body 23.
A reinforcing plate 28 made of a semi-cylindrical non-magnetic material arranged around the outer circumference of the electrode 22 is used to provide magnetic flux in a direction perpendicular to the line connecting the electrodes 22 and perpendicular to the direction of fluid flow (in the vertical direction in the figure). The core of the magnetic field generating means, 29 is a coil also wound around the core 28,
30 is a terminal box formed in the upper part of the case body 23. The basic configuration of the electromagnetic flowmeter is the same as that shown in FIG. However, in the structure of this embodiment, the conventional pipe is not provided,
The outer peripheral case body 23 of the lining tube 20,
It is designed to be held by a case lid, a reinforcing plate 27a, etc., which will be described later. In addition, the lining tube 20 has flared flange surfaces 25a and 26a.
The length dimension is such that it comes into close contact with the

In FIG. 4, 31 is a case lid, and 26b is a flange surface formed on the outer surface of the case lid 31 on the outflow side. Flange surfaces 26a and 26b constitute a completely flat flange surface. Although not shown, a flange surface is similarly formed on the inflow side of the case lid 31. Also, 32a, 32
33 b denotes two bolt screw holes formed on each of the flange surfaces 26a and 26b at a distance of 90 degrees from each other;
are two mounting pieces provided on the protective ring 21 at 180° intervals. This mounting piece 33 has a hole through which a screw passes, and the protective ring 21 can be detachably attached to the flange surfaces 26a, 26b using the screw. Also, 34 is an assembly bolt, 35 is an assembly nut, and insert the assembly bolt 34 into the case assembly hole of the case body 23 and the case lid 31.
By inserting the case and tightening it with an assembly nut, the case body 23 and the case lid 31 are assembled, and the case body 23 and the case lid 31 are assembled together.
The lining tube 20 is strongly clamped by the inlet and outlet sides of the tube. Assembly bolt 3
4 and the assembly nut 35, the case body 23 and the case lid 31 can be separated from the dividing plane A including the tube axis, and the lining tube 20 can be easily removed.

FIG. 5 is a cross-sectional view of FIG. 3. 27b
is a reinforcing plate formed in a semi-cylindrical shape, and the reinforcing plate 27a
Together, they form a complete cylindrical shape, surrounding and reinforcing the outer periphery of the lining tube 20.

FIG. 6 is a perspective view of the reinforcing plates 27a and 27b. Note that 37b is a through hole formed in the reinforcing plate 27b so that the electrode passes through the reinforcing plate 27b without touching it. Although not shown, a through hole is similarly formed in the reinforcing plate 27a.

FIG. 7 is a cross-sectional view of FIG. 4. The bolt screw hole 32b formed in the flange surface 26b of the case lid 31 is a blind hole that does not pass through, and a thread is cut on the inner peripheral surface thereof. A bolt for connecting pipes is screwed into this bolt screw hole 32b. Note that the bolt screw holes 32a on the flange surface 26a of the case body 23 are formed in exactly the same manner, and the bolt screw holes on the flange surface on the inflow side are also formed in the same manner.

FIG. 8 is a front view of the case body 23. 40
41 a and 40b are holding surfaces for holding lining tubes formed in semicircular shapes from the dividing surface on the inflow side and outflow side of the case body 23;
a and 41b are reinforcing plate holding surfaces formed slightly deeper than the holding surfaces 40a and 40b to hold both ends of the reinforcing plate 27a, and 42a and 42b are holding surfaces 40a and 4
They are recessed holes formed in the center of each. Note that the holding surface and the reinforcing plate holding surface are similarly formed on the case lid. Moreover, FIG. 9 is a perspective view of the lining tube 20. 43a and 43b are the recessed holes 4 on the outer peripheral surface of the lining tube 20.
Protrusions 44 provided at positions corresponding to 2a and 42b are electrodes. Here, when the lining tube 20 is held between the case body 23 and the case lid 31, by inserting it into the protrusion 43a and the recessed hole 42a, and inserting the protrusion 43b into the recessed hole 42b, the position of the lining tube 20 in the circumferential direction with respect to the case is adjusted. positioned. Note that the axial position is also determined at the same time. When the lining tube 20 is positioned in the circumferential direction in this manner, the relative position between the electrode and the magnetic field generating means is always accurately maintained. Here, the recessed holes 42a, 42b and the protrusion 43a,
43b constitutes a positioning means. By providing the positioning means in this way, it is possible to avoid the electrode direction and the magnetic flux direction not being perpendicular to each other,
It is possible to prevent the problem of signal detection sensitivity decreasing.

FIG. 10 is a front view of the transmitter with piping connected to it. Reference numeral 46 indicates a pipe on the fluid inflow side, and reference numeral 47 indicates a flange of this pipe 46. By screwing a coupling bolt 48 through a bolt hole of the flange 47 into a bolt screw hole formed on the flange surface 25b of the case lid 31, the transmitter can be connected. is connected to the pipe 46 on the inflow side. Similarly, 49 is a pipe on the fluid outflow side, 50 is a flange of this pipe 49, and the connecting bolt 48 is passed through the bolt hole of the flange 50 to the flange surface 26b.
The transmitter is connected to the outflow side piping 49 by screwing into the bolt screw hole 32b formed in the transmitter. It goes without saying that the coupling bolt is screwed into the bolt screw hole in the same manner on the flange surface of the case body.

Next, FIG. 11 is a vertical sectional view of another embodiment divided by the case dividing plane, FIG. 12 is a side view, and FIG.
The figure is a - sectional view of FIG. 11. In the figure, the same or corresponding parts as in FIGS. 3 and 4 are given the same reference numerals. The flange surfaces 25a, 26a of the case body 23 and the flange surfaces 25b, 26b (25b not shown) of the case lid 31 are flange portions 52a, 52a and 26b (25b not shown) formed between the case body 23 and the case lid 31 through recesses, respectively. 52b,
They are formed on the outer surfaces of 53a and 53b (52b is not shown). As shown in FIG. 12, bolt holes 32c and 32d passing through in the axial direction are formed in the outflow side flange portions 53a and 53b, respectively. Furthermore, reinforcing ribs 54 are formed in the recessed portions at every 90° as shown in FIG. Note that bolt holes, reinforcing ribs, etc. are similarly formed on the flange portion on the inflow side. In this embodiment, flanges are provided on the inflow side and the outflow side as in the example shown in Fig. 1.
Because a round hole is formed here instead of a screw hole,
Connections to the pipes are made by conventional connecting bolts and nuts. Therefore, there is no need to create a screw hole.

In the above embodiments, the reinforcing plate is divided into two parts, but it may be an integral cylindrical plate. This one-piece type is stronger than the two-piece type, so it can be made thinner. However, when replacing the lining tube, it will be replaced at the same time.

In addition, in the case of forming bolt holes on the flange surface, if the case body and case lid are made of relatively soft materials such as aluminum or synthetic resin, the threads may become damaged if the connecting bolts are attached and detached frequently. It may break. In such a case, inserting a well-known helisert into the bolt screw hole will strengthen the screw.

As described above, according to the electromagnetic flowmeter transmitter of this invention, costs can be reduced because there is no need for expensive flanged pipes, and if the lining tube is damaged, only the lining tube can be easily replaced at the facility site. It has an excellent effect in that it can reduce repair costs.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional electromagnetic flowmeter transmitter.
2 is a cross-sectional view of FIG. 1, FIG. 3 is a vertical cross-sectional view of the electromagnetic flowmeter transmitter according to this invention, FIG. 4 is a side view thereof, and FIG. 5 is a cross-sectional view of FIG. Figure 6 is a perspective view of the reinforcing plate, and Figure 7 is the − of Figure 4.
8 is a front view of the case body, FIG. 9 is a perspective view of the lining tube, FIG. 10 is a front view of the pipe connected to the transmitter, and FIG. 11 is a longitudinal section of another embodiment. Figure 12 is its side view, Figure 1
FIG. 3 is a cross-sectional view of FIG. 11. 20... Lining tube, 21... Protective ring, 22... Electrode, 23... Case body, 25
a, 26a, 26b...flange surface, 27a, 2
7b... Reinforcement plate, 28... Core, 29... Coil, 31... Case lid, 32a, 32b... Bolt screw hole, 40a, 40b... Holding surface, 42a,
42b...concave hole, 43a, 43b...protrusion. 〓〓〓〓

Claims (1)

[Scope of utility model registration request] An electromagnetic device, wherein at least one of the cases is divided into two by a plane including the tube axis, and a magnetic field generating means for applying a magnetic flux to the fluid to be measured is accommodated, and a flow path for passing the fluid to be measured is formed in the case. In the flowmeter transmitter, flange surfaces are formed on the outer surfaces of the case on the inflow side and the outflow side of the fluid to be measured, bolt holes are provided on the flange surfaces for coupling with connection piping, and a cylindrical shape is provided as the flow path. an insulating lining tube formed in a shape and having a pair of electrodes fixed to a portion symmetrical to the tube axis, a reinforcing plate held in the case and having a pair of openings bored in a portion corresponding to the electrodes; An electromagnetic flowmeter characterized in that an outer peripheral surface of the lining tube is held between the lining tubes, and an end of the lining tube is flared outward at the flange surface of the case and connected to the piping. Transmitter.