JP2018036173A - Electromagnetic flowmeter - Google Patents

Abstract

An electromagnetic flow meter having a novel configuration with less inconvenience is obtained, for example, lining wear can be detected in a place where lining wear is more likely to be accelerated. An electromagnetic flow meter according to an embodiment includes, for example, a pipe, a flange, a lining, and at least one wear detection electrode. A fluid to be measured flows through the tube. The flanges are provided at both ends of the tube in the axial direction, and project from the tube to the outside in the radial direction of the tube. The lining has a first part covering the inner surface of the pipe, a second part covering the end face of the flange, and a third part covering between the inner face and the end face and connected to the first part and the second part. And having. The wear detection electrode is provided so as to be buried in the lining, and is configured to be exposed in the flow path from the inner surface of the lining worn according to the wear of the lining. Provided inside the part. [Selection] Figure 2

Description

  Embodiments described herein relate generally to an electromagnetic flow meter.

  Conventionally, a pipe, a lining that covers the inner surface of the pipe, and a wear detection electrode that is embedded in the lining and is configured to be exposed in the flow path from the inner surface of the lining according to the wear of the lining. Electromagnetic flowmeters are known.

JP 2006-250692 A

  In this type of electromagnetic flow meter, it is preferable if a new configuration with less inconvenience is obtained, for example, lining wear can be detected in a place where lining wear is more likely to be accelerated.

  The electromagnetic flow meter according to the embodiment includes, for example, a pipe, a flange, a lining, and at least one wear detection electrode. A fluid to be measured flows through the tube. The flanges are provided at both ends of the tube in the axial direction, and project from the tube to the outside in the radial direction of the tube. The lining has a first part covering the inner surface of the pipe, a second part covering the end face of the flange, and a third part covering between the inner face and the end face and connected to the first part and the second part. And having. The wear detection electrode is provided so as to be buried in the lining, and is configured to be exposed in the flow path from the inner surface of the lining worn according to the wear of the lining. Provided inside the part.

FIG. 1 is an exemplary schematic perspective view of the electromagnetic flow meter of the first embodiment. 2 is a cross-sectional view taken along the line II-II in FIG. 3 is a cross-sectional view taken along the line III-III in FIG. FIG. 4 is an exemplary schematic block diagram of the electromagnetic flow meter of the first embodiment. FIG. 5 is an exemplary and schematic graph showing the relationship between the lining thickness and the usage time of the electromagnetic flow meter of the first embodiment. FIG. 6 is an exemplary schematic cross-sectional view of the electromagnetic flow meter of the second embodiment. 7 is a sectional view taken along line VII-VII in FIG. FIG. 8 is an exemplary schematic cross-sectional view of the electromagnetic flow meter of the third embodiment. FIG. 9 is an exemplary schematic cross-sectional view of the electromagnetic flow meter of the fourth embodiment. 10 is a cross-sectional view taken along the line XX of FIG. FIG. 11 is an exemplary schematic block diagram of the electromagnetic flow meter of the fourth embodiment. FIG. 12 is an exemplary schematic graph showing the relationship between the lining thickness and the usage time of the electromagnetic flow meter of the fourth embodiment.

  Hereinafter, exemplary embodiments of the present invention are disclosed. The configuration of the embodiment shown below, and the operation and result (effect) brought about by the configuration are examples.

  Moreover, the same component is contained in several embodiment disclosed below. Therefore, below, the same code | symbol is provided to those similar components, and the overlapping description is abbreviate | omitted. In the following drawings, directions are defined for convenience. The X direction is along the axial direction of the measuring tube 4, the R direction is along the radial direction of the measuring tube 4, and the C direction is along the circumferential direction of the measuring tube 4.

<First Embodiment>
As shown in FIG. 1, the electromagnetic flow meter 1 includes, for example, a detector 2 and a converter 3. The detector 2 detects an electromotive force generated when a conductive fluid to be measured flows through the measurement tube 4. The converter 3 converts the electromotive force detection signal detected by the detector 2 into a flow rate value. The electromagnetic flow meter 1 can be configured as, for example, a constant excitation type (AC excitation type) electromagnetic flow meter.

  As shown in FIG. 2, the detector 2 includes, for example, a tube body 7, a detection electrode 8, and a coil unit 9. A flow path 7 a through which a fluid to be measured flows is provided inside the tube body 7. The detection electrode 8 is provided in a state of being exposed to the inside of the flow path 7a and can contact the fluid to be measured. As shown in FIG. 3, the line connecting the pair of detection electrodes 8 is substantially orthogonal to the axis Ax of the tube body 7 (measurement tube 4). The coil unit 9 is provided outside the flow path 7a, and generates a magnetic field in a direction orthogonal to the line connecting the pair of detection electrodes 8 and the axis Ax.

  As illustrated in FIG. 1, the converter 3 includes, for example, a housing 10, an output unit 12, and a control unit 30 (see FIG. 4). The output unit 12 is, for example, a liquid crystal display and has a display screen 12a. The output unit 12 is supported by the housing 10 so that the display screen 12a is visible. The display screen 12a is covered with, for example, a transparent panel 11 and is visually recognized through the panel 11.

  Further, the converter 3 is fixed to the detector 2 via the connecting portion 13. As shown in FIG. 2, a wiring 14 that electrically connects the converter 3 and the detector 2 is provided inside the connecting portion 13. As shown in FIG. 3, the detection signal of the electromotive force detected by the detection electrode 8 is sent to the control unit 30 via the wiring 14. Further, the exciting current of the coil unit 9 flows through the wiring 14.

  In the electromagnetic flow meter 1, when a magnetic field is generated in the flow path 7 a by the pair of coil units 9 and a conductive fluid to be measured flows in a direction perpendicular to the magnetic field, the direction perpendicular to the magnetic field and the fluid to be measured is used. An electromotive force is generated. The electromotive force generated by the fluid to be measured is detected by the pair of detection electrodes 8. A detection signal corresponding to the magnitude of the electromotive force is sent from the pair of detection electrodes 8 to the converter 3. The control unit 30 of the converter 3 calculates the flow rate from the detection signal and causes the output unit 12 to display the flow rate. The detection electrode 8 can also be referred to as an electromotive force detection electrode.

  As shown in FIG. 2, the tube body 7 includes, for example, a measurement tube 4, a flange 5, a lining 6, and a storage unit 20. The tube 7 is connected between two other tubes 100 through which the fluid to be measured flows. The tubular body 100 is an example of an object to be combined.

  The measurement tube 4 is formed in a cylindrical shape centered on the axis Ax of the tube body 7. The measurement tube 4 has an outer surface 4a and an inner surface 4b. As shown in FIGS. 1 and 2, the flange 5, the accommodating portion 20, and the like are provided on the outer surface 4 a of the measurement tube 4, and the lining 6, the detection electrode 8, and the like are provided on the inner surface 4 b of the measurement tube 4. The measurement tube 4 can be made of, for example, a nonmagnetic metal material such as stainless steel, or a synthetic resin material such as polyvinyl chloride. The measurement tube 4 is an example of a tube.

  As shown in FIG. 1, the flange 5 is formed in an annular plate shape along the outer surface 4 a of the measurement tube 4. The flange 5 is coupled to the measuring tube 4 by welding (welded portion Wf1 in FIG. 2), for example. The flange 5 is provided at each of both end portions 4 c in the X direction of the measuring tube 4. In the following description, when the pair of flanges 5 and 5 are described without particular distinction, they are also simply referred to as flanges 5.

  As shown in FIG. 2, the flange 5 has an end face 5a. The end surface 5 a faces the flange 100 a of the tube body 100. As shown in FIG. 1, the flange 5 is provided with a plurality of holes 5 b penetrating the flange 5 in the X direction. A coupling tool (not shown) (for example, a bolt or the like) that couples the tubular body 7 and the tubular body 100 (see FIG. 2) is inserted into the hole 5b. The flange 5 can be made of, for example, a nonmagnetic metal material such as stainless steel or a synthetic resin material such as polyvinyl chloride.

  The accommodating part 20 has the wall part 15 and the wall part 16, for example. As shown in FIG. 2, the two wall portions 15 are provided to be spaced from each other in the X direction and project from the outer surface 4 a of the measuring tube 4 in a flange shape along the R direction. The wall portion 16 is configured in a cylindrical shape along the outer surface 4 a of the measuring tube 4. The wall portion 16 is provided between the two wall portions 15 and is coupled to an end portion of the wall portion 15 on the side opposite to the measurement tube 4 by, for example, welding (welded portion Wf2 in FIG. 2). Moreover, the edge part by the side of the measurement pipe | tube 4 of the wall part 15 is couple | bonded with the outer surface 4a of the measurement pipe | tube 4 by welding (welding part Wf3 of FIG. 2), for example.

  As shown in FIG. 3, a part of the detection electrode 8, the coil unit 9, the wiring 14, and the like are housed in the housing portion 20. The wall portion 16 covers the detection electrode 8, the coil unit 9, the wiring 14 and the like along the outer surface 4a of the measuring tube 4.

  As shown in FIG. 2, the lining 6 includes, for example, a cylindrical portion 6a, a flange portion 6b, and a curved portion 6c. The flange portion 6b and the curved portion 6c can also be referred to as flare portions.

  The cylindrical portion 6 a is configured in a cylindrical shape along the inner surface 4 b of the measurement tube 4 and covers the inner surface 4 b of the measurement tube 4. A surface 6e of the cylindrical portion 6a opposite to the measuring tube 4 constitutes a flow path 7a. The cylindrical portion 6 a is an example of a first portion, and the surface 6 e is an example of an inner surface of the lining 6.

  The flange portion 6 b is formed in an annular plate shape that extends along the end surface 5 a of the flange 5, and covers the end surface 5 a of the flange 5. The flange portion 6b is connected to each of both end portions in the X direction of the cylindrical portion 6a via a curved portion 6c. As shown in FIG. 1, the flange 5 is covered by the flange portion 6b from the inner edge portion of the end surface 5a to the front portion of the hole 5b. The flange portion 6b has an end face 6b1. The end surface 6b1 is a surface opposite to the flange 5 of the flange portion 6b, and faces the flange 100a of the tubular body 100 (see FIG. 2). The flange portion 6b is an example of a second portion.

  The curved portion 6c is formed in a trumpet shape along the inner edge portion of the end surface 5a. As shown in FIG. 2, the curved portion 6c covers the welded portion Wf1 between the inner surface 4b and the end surface 5a, and is smoothly connected to the cylindrical portion 6a and the flange portion 6b. In the present embodiment, the surface 6e opposite to the welded portion Wf1 of the curved portion 6c is configured in a curved surface shape. If a corner portion is provided on the surface 6e of the curved portion 6c, the curved portion 6c may be easily scraped, that is, easily worn by sand or gravel contained in the fluid to be measured. In this respect, according to the present embodiment, since the surface 6e of the curved portion 6c opposite to the welded portion Wf1 is formed in a curved surface, wear of the curved portion 6c is easily suppressed. The curved portion 6c is an example of a third portion.

  The lining 6 integrally protects the measurement tube 4 from the fluid to be measured by covering the inner surface 4b of the measurement tube 4, the end surface 5a of the flange 5, and the like. The lining 6 is an insulator. The lining 6 can be made of, for example, a synthetic resin material such as a fluororesin.

  The lining 6 has a plurality of (for example, two) coating layers 61 and 62. The covering layers 61 and 62 are each formed in a sheet shape having a predetermined thickness, and are stacked on each other. In this embodiment, the thickness of the coating layers 61 and 62 is substantially the same. The covering layer 61 is coupled to the inner surface 4b of the measuring tube 4, the welded portion Wf1, and the end surface 5a of the flange 5 by, for example, an adhesive.

  In the present embodiment, the wear detection electrode 40 is provided between the coating layer 61 and the coating layer 62. The wear detection electrode 40 is configured in a mesh shape and a sheet shape having a predetermined thickness by, for example, a metal wire such as an aluminum wire or a copper wire. As shown in FIGS. 2 and 3, the wear detection electrode 40 is sandwiched between the coating layer 61 and the coating layer 62 over substantially the entire area of the lining 6. That is, the wear detection electrode 40 is provided inside the cylindrical portion 6a of the lining 6, inside the flange portion 6b, and inside the curved portion 6c. The wear detection electrode 40 is coupled to the coating layer 61 by, for example, an adhesive. The covering layer 62 is coupled to the wear detection electrode 40 and the covering layer 61 by, for example, an adhesive. The wear detection electrode 40 may be provided with a relief hole through which the detection electrode 8 passes.

  As shown in FIG. 2, in the present embodiment, the tube body 7 is connected to a tube body 100 (an object to be joined) having a larger diameter than the tube body 7. In such a case, the curved portions 6 c located at both ends in the X direction of the lining 6 face the flow path of the tubular body 100. Therefore, the curved portion 6c is most easily worn out of the lining 6 due to sand, gravel or the like contained in the fluid to be measured. Here, as described above, in the present embodiment, at least a part of the wear detection electrode 40 is provided inside the curved portion 6c. Therefore, according to the present embodiment, for example, the wear detection electrode 40 can detect the wear of the curved portion 6 c that is most easily worn out of the lining 6. Further, since the sheet-shaped wear detection electrode 40 is provided along the curved portion 6c, for example, in a wider range than the case where the projection-shaped wear detection electrode 40 is provided inside the curved portion 6c. Wear of the curved portion 6c can be detected. Further, in the present embodiment, since the wear detection electrode 40 is provided inside the curved portion 6c on both sides in the X direction, for example, even when the tube body 7 is attached in a 180 ° inverted posture, Similar wear detection performance can be obtained. That is, according to the present embodiment, the degree of freedom of the mounting posture of the tube body 7 is likely to increase.

  Further, as shown in FIG. 2, the wear detection electrode 40 has an end portion 40a. The end portion 40a extends from the flange portion 6b along the R direction, protrudes from the outer end portion of the flange portion 6b in the R direction to the outside of the lining 6, and the tube body 7 is attached to the tube body 100. , Projecting outward in the R direction from the flange 5,100a. As described above, the end portion 40a is configured to be connectable to the positive electrode lead 31a of the continuity detecting unit 31 (see FIG. 4) outside the flanges 5 and 100a in the R direction. The end 40a is an example of a first end.

  Further, the control unit 30 may be configured to include a CPU (Central Processing Unit), for example. The control unit 30 can function (operate) as a continuity detection unit 31, a life calculation unit 32, an output control unit 33, and the like as illustrated in FIG. 4 in cooperation with hardware and software (program). . For example, the control unit 30 reads a program installed in a storage unit such as a ROM or a flash memory, and executes processing according to the program. The control unit 30 may include a PLD (Programmable Logic Device), an ASIC (Application Specific Integrated Circuit), and the like.

  In the electromagnetic flow meter 1, for example, the positive electrode lead 31a of the continuity detecting unit 31 and the end 40a (see FIG. 2) are electrically connected, and the negative electrode lead 31b of the continuity detecting unit 31 and the flange 5 as a ground (FIG. 2). Are used in an electrically connected state. When the coating layer 62 of the lining 6 shown in FIGS. 2 and 3 is worn and the wear detection electrode 40 is exposed in the flow path 7a from the surface 6e (inner surface) of the lining 6 and comes into contact with the fluid to be measured, An electrical circuit that reaches the wear detection electrode 40, the end 40a, the positive electrode lead 31a, the continuity detection unit 31, the negative electrode lead 31b, and the flange 5 is formed. The control unit 30 functions as the continuity detection unit 31 and can detect continuity between the end 40a and the flange 5 (ground). Note that the continuity detection unit 31 may be a so-called external device such as a tester, for example. Alternatively, the negative electrode lead 31b of the continuity detecting unit 31 may be provided in contact with the fluid to be measured in the flow path 7a, and a voltage may be applied.

Further, the control unit 30 functions as a life calculation unit 32 when the continuity detection unit 31 detects continuity between the end 40a and the flange 5 (ground), and the lining 6 based on the detection result by the continuity detection unit 31. The lifetime of can be calculated. As shown in FIG. 5, the life calculation unit 32 is, for example, the following equation (1)
te = td · Te / Td (1)
Thus, the lifetime of the lining 6 can be calculated. Here, te is the life of the lining 6 (usable time, use limit time), and td has elapsed from the start of use of the electromagnetic flow meter 1 (start of flow) until the continuity is detected in the continuity detecting unit 31. Time, Te is the thickness of the lining 6, that is, the total thickness of the coating layer 61 and the coating layer 62, and Td is the thickness of the coating layer 62 of the lining 6. Equation (1) is an example. For example, te is appropriately divided by a safety factor, a change in wear rate (gradient) with time is non-linear, or a wear rate corresponding to a change in the fluid to be measured. Or may be given.

  Further, the control unit 30 functions as the output control unit 33 and controls the output unit 12 so as to perform output according to the detection result of the continuity by the continuity detection unit 31 and the calculation result of the lifetime by the lifetime calculation unit 32. Can do. The output content by the output unit 12 is, for example, a warning display informing that the wear detection electrode 40 has been exposed in the flow path 7a, the remaining usable time until the lifetime, and the like. The output unit 12 is an example of a display output unit. The output unit 12 may be, for example, a lamp or LED (Light Emitting Diode) as another example of the display output unit, or may be an audio output unit such as a speaker or a buzzer.

  As described above, in this embodiment, for example, at least a part of the wear detection electrode 40 is provided inside the curved portion 6c (third portion). Therefore, according to the present embodiment, for example, the wear detection electrode 40 can detect the wear of the end portion in the X direction that is most worn out of the lining 6, that is, the bending portion 6c.

  In the present embodiment, for example, the lining 6 includes a plurality of coating layers 61 and 62 that are stacked on each other, and the wear detection electrode 40 is provided between the two coating layers 61 and 62. Therefore, according to the present embodiment, for example, a configuration in which the inner surface 4b of the measurement tube 4 is covered with the lining 6 provided in a state where the wear detection electrode 40 is buried can be obtained relatively easily. Further, depending on the thickness of the covering layer 62, the thickness of the lining 6 between the surface 6e (inner surface) of the lining 6 and the wear detection electrode 40, that is, from the start of use until the continuity is detected by the continuity detecting unit 31. You can set the time. In addition, the time from when the continuity is detected by the continuity detection unit 31 to the lifetime can be set according to the thickness of the covering layer 61.

  In the present embodiment, for example, the wear detection electrode 40 is configured in a mesh shape. Therefore, according to the present embodiment, for example, wear of the lining 6 can be detected in a relatively wide range by the wear detection electrode 40 that is light and inexpensive.

  In the present embodiment, for example, the wear detection electrode 40 is exposed to the outside of the flow path 7a from the flange portion 6b (second portion) in a state where the flange 5 is attached to the tubular body 100 (an object to be coupled). End 40a (first end). Therefore, according to the present embodiment, for example, a circuit that detects conduction of the wear detection electrode 40 can be configured relatively easily.

  In the present embodiment, for example, the electromagnetic flow meter 1 includes a continuity detection unit 31 that detects continuity in the wear detection electrode 40 and a lifetime calculation unit that calculates the lifetime of the lining 6 based on the detection result of the continuity detection unit 31. 32 and an output control unit 33 that controls the output unit 12 to perform output according to the life. Therefore, according to the present embodiment, for example, the electromagnetic flow meter 1 capable of predicting the lifetime of the lining 6 can be obtained by the continuity detecting unit 31, the lifetime calculating unit 32, and the output control unit 33.

Second Embodiment
The electromagnetic flow meter 1A of the embodiment shown in FIGS. 6 and 7 has the same configuration as the electromagnetic flow meter 1 of the first embodiment. Therefore, also according to this embodiment, the same result (effect) based on the same configuration as that of the first embodiment can be obtained.

  However, in the present embodiment, for example, as shown in FIGS. 6 and 7, the point that the wear detection electrode 40 </ b> A is provided on a part of the entire circumference of the lining 6 is different from the first embodiment. ing. Since sand, gravel, etc. contained in the fluid to be measured sink due to its own weight, it is easy to flow through the region below the measuring tube 4 in the installed state. Therefore, in the present embodiment, the wear detection electrode 40 </ b> A is provided only in the lower region of the entire circumference of the lining 6. That is, the lining 6 has a non-detection region S1 (see FIG. 7) that does not include the wear detection electrode 40A and a detection region S2 (see FIG. 7) that includes the wear detection electrode 40A. . In the present embodiment, the detection region S2 is a substantially semicircular region below the detection electrode 8 in the installed state. Therefore, according to the present embodiment, for example, the wear detection and life prediction of the lining 6 can be more effectively executed by the wear detection electrode 40A that is relatively small and inexpensive.

<Third Embodiment>
The electromagnetic flow meter 1B of the embodiment shown in FIG. 8 has the same configuration as the electromagnetic flow meter 1 of the first embodiment. Therefore, also according to this embodiment, the same result (effect) based on the same configuration as that of the first embodiment can be obtained.

  However, in the present embodiment, for example, as shown in FIG. 8, the point that the wear detection electrode 40B has a plurality of detection electric wires 40b is different from the first embodiment. The plurality of detection electric wires 40b are provided apart from each other in the C direction (circumferential direction, see FIG. 7), and each extend linearly along the X direction. The plurality of detection electric wires 40b are connected to each other at both ends in the X direction. Further, the wear detection electrode 40B is provided only in the lower region of the entire circumference of the lining 6 as in the second embodiment. Therefore, according to the present embodiment, for example, the usage amount of the wear detection electrode 40B is likely to be reduced, and the labor and cost required for manufacturing the electromagnetic flow meter 1B are likely to be reduced. In the present embodiment, the case where the plurality of detection electric wires 40b are connected to each other is illustrated, but the present invention is not limited to this. For example, each of the detection wires 40b is independently drawn out of the flow path 7a from the flange portion 6b. Also good. In this case, by detecting the continuity of the end portions 40a of the respective detection electric wires 40b by the continuity detection unit 31, it becomes easy to specify the place where the lining 6 is worn.

<Fourth embodiment>
The electromagnetic flow meter 1C of the embodiment shown in FIGS. 9 to 12 has the same configuration as the electromagnetic flow meter 1 of the first embodiment. Therefore, also according to this embodiment, the same result (effect) based on the same configuration as that of the first embodiment can be obtained.

  However, in this embodiment, for example, the lining 6 has three coating layers 61 to 63 (see FIGS. 9 and 10), and between the coating layer 61 and the coating layer 62 and between the coating layer 62 and the coating layer 63. The point which the wear detection electrode 40 is provided in each between is different from the said 1st Embodiment. As shown in FIG. 11, in this embodiment, the continuity detection unit 31 includes, for example, a first continuity detection unit 31A and a second continuity detection unit 31B. The first continuity detection unit 31A detects the continuity of the wear detection electrode 40 between the coating layer 62 and the coating layer 63 shown in FIGS. 9 and 10, that is, the wear detection electrode 40 on the inner side (channel 7a side). . Further, the second continuity detection unit 31B conducts the wear detection electrode 40 between the coating layer 61 and the coating layer 62 shown in FIGS. 9 and 10, that is, the continuity of the wear detection electrode 40 on the outer side (measurement tube 4 side). To detect. When the coating layer 63 of the lining 6 is worn and the inner wear detection electrode 40 is exposed in the flow path 7a and comes into contact with the fluid to be measured, the fluid to be measured, the inner wear detection electrode 40, the end 40a, and the positive electrode lead 31a. Then, an electric circuit extending to the first continuity detecting portion 31A, the negative electrode lead 31b, and the flange 5 is formed. The control unit 30 (see FIG. 11) functions as the first continuity detection unit 31A and can detect continuity between the inner wear detection electrode 40 and the flange 5 (ground). Further, when the coating layer 62 of the lining 6 is worn and the outer wear detection electrode 40 is exposed in the flow path 7a and comes into contact with the fluid to be measured, the fluid to be measured, the outer wear detection electrode 40, the end 40a, the positive electrode An electric circuit extending to the lead 31a, the second continuity detecting unit 31B, the negative electrode lead 31b, and the flange 5 is formed. The control unit 30 functions as the second continuity detection unit 31B and can detect continuity between the outer wear detection electrode 40 and the flange 5 (ground).

  For example, when the first continuity detection unit 31A and the second continuity detection unit 31B detect continuity, the control unit 30 functions as the life calculation unit 32 and determines the life of the lining 6 based on the detection result. Can be calculated. In the present embodiment, the thicknesses of the coating layers 61 to 63 are substantially the same. As illustrated in FIG. 12, the life calculation unit 32 calculates te by multiple regression analysis, regression analysis, or the like based on the time required from 0 to td1 and the time required from td1 to td2, for example. be able to. Here, te is the life of the lining 6 (usable time, usable time limit), and td1 is from the start of use of the electromagnetic flow meter 1C (start of flow) until the first continuity detecting unit 31A detects continuity. , Td2 is the time elapsed from the start of use of the electromagnetic flow meter 1C until the continuity is detected in the second continuity detection unit 31B. Te is the total thickness of the lining 6, that is, the total thickness of the coating layers 61 to 63, Td 1 is the thickness of the coating layer 63 of the lining 6, and Td 2 is the thickness of the coating layers 62 and 63 of the lining 6. It is the total thickness. Therefore, according to the present embodiment, for example, the life of the lining 6 can be predicted more accurately by the plurality of wear detection electrodes 40. The number of wear detection electrodes 40 is not limited to two, and may be three or more, for example. Further, the thicknesses of the three or more coating layers 61 to 63 may be different from each other. For example, the thickness of the coating layers 61 to 63 may be reduced toward the outside in the R direction.

  As mentioned above, although embodiment of this invention was illustrated, the said embodiment is an example to the last, Comprising: It is not intending limiting the range of invention. The above embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the spirit of the invention. The above embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. The present invention can be realized by configurations other than those disclosed in the above embodiments, and various effects (including derivative effects) obtained by the basic configuration (technical features) can be obtained. is there. In addition, the specifications of each component (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) should be changed as appropriate. Can do.

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C ... Electromagnetic flowmeter, 4 ... Measuring pipe (tube), 4b ... Inner surface, 4c ... Both ends, 5 ... Flange, 5a ... End surface, 6 ... Lining, 6a ... Cylindrical part (1st Part), 6b ... flange part (second part), 6c ... curved part (third part), 6e ... surface (inner surface), 7a ... flow path, 12 ... output part, 31 ... conduction detecting part, 32 ... Life calculation part 33 ... Output control part 40, 40A, 40B ... Wear detection electrode, 40a ... End part (first end part), 61-63 ... Cover layer, 100 ... Pipe body (joining object), C ... circumferential direction, R ... radial direction, S1 ... non-detection area, S2 ... detection area, X ... axial direction.

Claims (6)

A tube through which the fluid to be measured flows;
Flanges provided at both ends in the axial direction of the tube, and projecting outward from the tube in the radial direction of the tube;
A first portion that covers the inner surface of the tube, a second portion that covers the end surface of the flange, a first portion that covers between the inner surface and the end surface, and is connected to the first portion and the second portion. A lining having three parts;
At least one wear detection electrode provided in a state embedded in the lining, and exposed in the flow path from the inner surface of the lining worn according to the wear of the lining;
With
An electromagnetic flow meter in which at least a part of the wear detection electrode is provided inside the third portion.   The lining is a part of the entire circumference of the lining along the inner circumference of the pipe and does not include the wear detection electrode, and another part of the circumference. The electromagnetic flow meter according to claim 1, further comprising: a detection region that includes the wear detection electrode therein and is positioned below the non-detection region in an installed state. The lining has a plurality of coating layers stacked on each other;
The electromagnetic flowmeter according to claim 1, wherein the wear detection electrode is provided between the two coating layers.   The electromagnetic flowmeter according to claim 1, wherein the wear detection electrode is configured in a mesh shape.   The wear detection electrode has a first end exposed to the outside of the flow path from the second portion in a state where the flange is attached to the object to be joined. The electromagnetic flow meter as described in any one. A conduction detector for detecting conduction in the wear detection electrode;
A lifetime calculation unit that calculates the lifetime of the lining based on the detection result by the continuity detection unit;
An output control unit for controlling the output unit to perform output according to the lifetime;
The electromagnetic flow meter according to claim 1, comprising:

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