JP6524292B2 - Method of manufacturing an electromagnetic flow meter - Google Patents

Description

Embodiments of the present invention relate to a method of manufacturing an electromagnetic flow meter.

  Conventionally, an electromagnetic flow that measures the flow by detecting an electromotive force generated in a direction orthogonal to the magnetic field in proportion to the flow velocity of the liquid flowing in the measurement tube by flowing a current through the exciting coil and generating the magnetic field in the measurement tube The measure is known. In this electromagnetic flowmeter, for example, a flange provided at an end of a measurement pipe is coupled to a coupling object such as another flange.

  As this type of electromagnetic flowmeter, it is known that a lining portion is provided across the inner peripheral surface of the measuring pipe and the end face of the flange provided at the end of the measuring pipe to protect the inner peripheral surface of the measuring pipe. ing. The lining portion is made of, for example, rubber or a synthetic resin material. The lining portion is coupled to the coupling target.

Japanese Utility Model Publication No. 59-187720

  In this type of electromagnetic flowmeter, it is desirable to be able to maintain a stable sealability between the lining portion provided on the flange and the object to be joined while suppressing the complication of the manufacturing process.

The manufacturing method of the magnetic flow meter of the embodiment includes a process and a vulcanization process. Wherein the electromagnetic flow meter, the fluid to be measured flows. The flange has an end face coupled to the object to be coupled via a seal member and is provided at the end of the tube. The lining portion has a first portion covering the inner circumferential surface of the pipe and a second portion covering the end surface, and is provided across the inner circumferential surface and the end surface. The recess is provided in the second portion, and the seal member is inserted. In the step, a rubber material is attached to the inner peripheral surface of the pipe and the end surface. In the vulcanization step, the rubber material adhered to the inner peripheral surface and the end surface is vulcanized in a state where a mold for molding the second portion and the recess is pressed against the rubber material of the end surface. Do.

FIG. 1 is a cross-sectional view showing an example of the electromagnetic flow meter according to the first embodiment. FIG. 2: is a figure which shows a part of example of the vulcanization process of the lining part of the electromagnetic flow meter concerning 1st Embodiment. FIG. 3: is a figure which shows a part of example of the injection molding process of the lining part of the electromagnetic flow meter concerning 1st Embodiment. FIG. 4 is a cross-sectional view showing a part of an example of the electromagnetic flow meter and the pipe according to the first embodiment. FIG. 5 is a cross-sectional view showing an example of the electromagnetic flow meter according to the second embodiment. FIG. 6 is a view showing a part of an example of the vulcanization process of the lining portion of the electromagnetic flowmeter according to the second embodiment. FIG. 7 is a view showing a part of an example of the injection molding process of the lining portion of the electromagnetic flowmeter according to the second embodiment. FIG. 8 is a cross-sectional view showing a part of an example of the electromagnetic flowmeter and the pipe according to the second embodiment. FIG. 9 is a view showing an example of the electromagnetic flowmeter according to the third embodiment as viewed from the axial center direction of the measurement pipe. FIG. 10: is a figure which shows a part of example of the vulcanization process of the lining part of the electromagnetic flow meter concerning 3rd Embodiment. FIG. 11 is a view showing a part of an example of a mold for the lining portion of the electromagnetic flowmeter according to the third embodiment. FIG. 12 is a view showing a part of an example of the injection molding process of the lining portion of the electromagnetic flowmeter according to the third embodiment. FIG. 13 is a view showing a part of an example of a mold for the lining portion of the electromagnetic flowmeter according to the third embodiment. FIG. 14 is a cross-sectional view showing a part of an example of the electromagnetic flowmeter and the pipe according to the third embodiment. FIG. 15 is a view showing an example of the electromagnetic flowmeter according to the fourth embodiment as viewed from the axial center direction of the measurement pipe. FIG. 16 is a view showing a part of an example of the vulcanization process of the lining portion of the electromagnetic flowmeter according to the fourth embodiment. FIG. 17 is a cross-sectional view showing a part of an example of the electromagnetic flowmeter and the pipe according to the fourth embodiment.

  Hereinafter, embodiments will be described in detail with reference to the drawings. In addition, the same component is contained in several following embodiments. Therefore, in the following, those similar components are given the same reference numerals, and redundant explanations are omitted.

First Embodiment
As shown in FIG. 1, as an example, the electromagnetic flowmeter 1 of the present embodiment includes a tube 2 provided with a flow passage 2 a through which a fluid to be measured flows, and a detection unit 3 provided on the tube 2. Have.

  The pipe body 2 has a measurement pipe 4 (pipe) through which the fluid to be measured flows. The detection unit 3 has an excitation coil 8 provided in the measurement pipe 4 and a pair of electrode members 9 (only one is shown in the figure) in contact with the fluid to be measured flowing through the measurement pipe 4. The line connecting the pair of electrode members 9 is orthogonal to the axial center of the measuring tube 4 (hereinafter simply referred to as the axial center). The exciting coil 8 also generates a magnetic field in the direction orthogonal to the axis connecting the pair of electrode members 9 and the axis.

  In the electromagnetic flow meter 1, when the magnetic field is generated inside the measuring tube 4 by the exciting coil 8 and the fluid to be measured flows in the direction (axial direction) orthogonal to the magnetic field, the direction orthogonal to the magnetic field and the fluid Generates an electromotive force. The electromotive force generated by the fluid to be measured is detected by the pair of electrode members 9 and sent to the control unit (not shown) as a detection signal. The control unit calculates (detects) the magnitude (value) of the electromotive force from the potential difference of the detection signal sent. Then, the control unit calculates the flow rate from the calculated magnitude of the electromotive force, sends the calculated flow rate to the display unit (not shown), and causes the display unit to display the flow rate.

  Next, the tube 2 will be described in detail. As shown in FIG. 1, the pipe body 2 has a measuring pipe 4 (pipe), a flange 5 and a lining portion 7.

  The measuring pipe 4 has a cylindrical shape as an example, and the fluid to be measured flows. The measuring pipe 4 has an outer peripheral surface 4a and an inner peripheral surface 4b. The measuring tube 4 also has a pair of end portions 4c in the axial direction. Measurement pipe 4 is made of, for example, a nonmagnetic material such as SUS (stainless steel). An excitation coil 8 is provided on the outer peripheral surface 4 a of the measuring pipe 4.

  The flanges 5 are provided at both ends 4 c of the measuring pipe 4. The flange 5 is, for example, an annular ring fitted to the outer peripheral surface 4 a of the measurement pipe 4 and is fixed to the measurement pipe 4 by welding 6. The flange 5 may be formed integrally with the measuring pipe 4 instead of the measuring pipe 4 and a separate member. The flange 5 has an end surface 5a (surface, coupling surface). The end face 5a is a face to be overlapped (opposed) with the flange 202 (FIG. 4) as an example of the coupling object. The end face 5a is coupled to the flange 202 via an O-ring 300 (FIG. 4) which is an example of a seal member. Specifically, the end face 5a is coupled to the flange 202 via the O-ring 300 and a flared portion 7b described later of the lining portion 7. Moreover, the hole 5c (attachment hole) which penetrated the said flange 5 along the axial center direction is provided in the flange 5. As shown in FIG. The flange 5 is made of, for example, a nonmagnetic metal material such as SUS (stainless steel). The coupling target may be an earth ring or the like.

  The lining portion 7 is provided across the inner peripheral surface 4 b of the measuring pipe 4 and the end surface 5 a of the flange 5. The lining portion 7 is made of, for example, a material such as a rubber material or a synthetic resin material. The lining portion 7 protects the inner circumferential surface 4 b of the measurement pipe 4 covered by the lining portion 7 and the end surface 5 a of the flange 5.

  The lining portion 7 has a cylindrical portion 7a (first portion) covering (covering) the inner circumferential surface 4b of the measuring pipe 4 and a flare portion 7b (second portion) covering (covering) the end face 5a of the flange 5 ,have.

  The cylindrical portion 7 a has a cylindrical shape along the inner circumferential surface 4 b of the measurement pipe 4. The inner circumferential surface 7a1 of the cylindrical portion 7a constitutes a flow passage 2a. The flared portion 7b is flanged in a direction substantially orthogonal to the axial direction from an end in the axial direction of the cylindrical portion 7a, and has, for example, a flat annular ring shape. The flare portion 7 b covers, for example, a portion from the inner peripheral edge portion to the outer peripheral edge portion of the end surface 5 a of the flange 5. The flare portion 7b also has an end face 7c. The end surface 7 c is a surface on the opposite side to the surface in contact with the end surface 5 a of the flange 5, and constitutes the outer surface of the tube 2. A recess 7d is provided on the end surface 7c of the flared portion 7b. An O-ring 300 is inserted into the recess 7 d as an example. The recess 7 d has an annular shape centered on the axis. The pair of electrode members 9 is provided to penetrate through the cylindrical portion 7a.

  A method of forming the lining portion 7 having the above-described structure will be described. First, the molding method in the case where the material of the lining portion 7 is rubber will be described. In this case, as an example, a worker uses a roller to stick a relatively thin sheet-like raw rubber (rubber material) to the inner peripheral surface 4 b of the measuring pipe 4 and the end surface 5 a of the flange 5. Next, the applied raw rubber is vulcanized (vulcanization process). As one example, the measuring pipe 4 and the flange 5 to which the raw rubber is attached are placed in a vulcanizer and sulfur and heat are applied to the raw rubber to which the raw rubber is attached. At this time, as shown in FIG. 2, vulcanization is performed in a state where the mold 100 (mold member, mold, jig) is pressed against the end face 7c (rubber of the end face 5a of the flange 5) of the flared part 7b in a raw rubber state. I do. The mold 100 has a surface 100 a (molding surface) for contacting the raw rubber and forming the end surface 7 c. The surface 100a is provided with a convex portion 100b for forming the concave portion 7d. The convex portion 100 b has an annular shape as an example. In addition, the mold 100 is provided with a hole 100c. The mold 100 is coupled to the flange 5 by a bolt 101 (joiner) inserted into the hole 100c and the hole 5c of the flange 5 and a nut 102 (jointer) coupled (screwed) to the bolt 101. . Then, at the time of vulcanization, the end face 7c is formed by the surface 100a in the flared part 7b, and the recess 7d is formed by the convex part 100b. A mold (not shown) may be brought into contact with the cylindrical portion 7a at the time of vulcanization. Thus, in the present embodiment, as an example, the flared portion 7 b (lining portion 7) is molded using the mold 100, and the concave portion 7 d is flared using the mold 100 during molding using the mold 100. It is provided in the part 7b.

  Next, the molding method in case the material of the lining part 7 is a synthetic resin material is demonstrated. In this case, as an example, as shown in FIG. 3, the lining portion 7 is formed by injection molding using a mold 103 (a mold member, a mold) (injection molding process). The mold 103 is provided with a recess 103 d on the surface 103 a facing the end surface 5 a of the flange 5. The recess 103 d has a surface 103 e (bottom surface, molding surface) for forming the end surface 7 c of the flare portion 7 b. The surface 103 e is provided with a convex portion 103 b for forming the concave portion 7 d. The convex portion 103 b has an annular shape as an example. The mold 103 is also provided with a screw hole 103c. The mold 103 is coupled to the flange 5 by a bolt 101 (joiner) inserted into the hole 5 c of the flange 5 and screwed with the screw hole 103 c. The mold 103 can be composed of a plurality of members. During the injection molding, as an example, a synthetic resin material in a molten state is poured between the inner circumferential surface 4 b of the measuring tube 4 and the end surface 5 a of the flange 5 and the mold 103 under pressure. Thereby, the lining part 7 having the recess 7 d is formed. Thus, in the present embodiment, as an example, the flared portion 7 b (lining portion 7) is molded using the mold 103, and the concave portion 7 d is flared using the mold 103 during molding using the mold 103. It is provided in the part 7b.

  As an example, as shown in FIG. 4, the electromagnetic flowmeter 1 of the above structure is connected with the pipe body 200 (connection member). The tube body 200 has, as an example, a cylindrical tube 201 and an annular flange 202 (to be coupled) provided at an end of the tube 201. The flange 202 has an end surface 202 a (coupling surface) facing the end surface 5 a of the flange 5 of the electromagnetic flow meter 1 and the end surface 7 c of the flare portion 7 b. Further, the flange 202 is provided with a hole 202 b. Then, the flanges 5 and 202 are coupled together by the bolt 101 inserted into the hole 5 c of the flange 5 and the hole 202 b of the flange 202 and the nut 102 screwed with the bolt 101. At this time, (a part of) the O-ring 300 is inserted into the recess 7 d. The O-ring 300 is in contact with the recess 7 d and the end face 202 a of the flange 202. In such a configuration, the O-ring 300 seals between the flared portion 7 b and the end surface 202 a of the flange 202 of the tube 200. Moreover, in the said structure, the maintenance of the electromagnetic flow meter 1 can be performed in the state which removed the nut 102 from the volt | bolt 101 and removed the electromagnetic flow meter 1 from the pipe body 200. FIG. At this time, the O-ring 300 can be replaced with a new one or the like.

  As described above, in the present embodiment, the flared portion 7 b (lining portion 7) is formed using the mold 100 or 103, and the recess 7 d is formed using the mold 103 during molding using the mold 100 or 103. Is provided in the flare portion 7b. Therefore, in the present embodiment, the manufacturing process is not complicated in order to form the recess 7 d. Further, in the present embodiment, the O-ring 300 seals the space between the flare portion 7 b and the end surface 202 a of the flange 202 of the tubular body 200 (to be coupled). As an example, between the lining part 7 (flare part 7b) provided on the flange 5 and the end face 202a of the tube 200 by periodically replacing the O-ring 300 with a new one at the time of maintenance of the electromagnetic flow meter 1 or the like. Stable sealability can be maintained. Thus, according to the present embodiment, it is possible to maintain a stable sealability between the lining portion 7 provided on the flange 5 and the flange 202 while suppressing the complication of the manufacturing process.

Second Embodiment
In the present embodiment, as shown in FIG. 5, the shape of the recess 7dA of the flared portion 7b is different from that of the recess 7d of the first embodiment. The recess 7dA of the present embodiment is for receiving an annular (as an example, annular) gasket 301 (FIG. 8). Here, as shown in FIG. 8, the gasket 301 has a pair of sealing surfaces 301 a (contact surfaces, surfaces). The pair of sealing surfaces 301 a is a pair of end surfaces (front and back) of the gasket 301 in the axial direction. The gasket 301 is an example of a seal member.

  As shown in FIG. 5, the recess 7dA has a sealing surface 7f (surface, side surface) and a peripheral surface 7g (surface) extending from the sealing surface 7f. The seal surface 7 f is a surface substantially orthogonal to the axial center. The sealing surface 7 f is in contact with the sealing surface 301 a of the gasket 301. Further, a hole 7e is provided in the seal surface 7f. The hole 7e communicates with the flow passage 2a on the inner peripheral side of the cylindrical portion 7a. The seal surface 7f has an annular shape by the hole 7e.

  When the material of the lining portion 7 is rubber, as shown in FIG. 6, the recess 7 dA is provided in the flare portion 7 b using the mold 100 during molding using the mold 100 as in the first embodiment. . The mold 100 of the present embodiment has a convex portion 100bA for forming the concave portion 7dA. The recess 7dA is formed by the protrusion 100bA at the time of vulcanization.

  When the material of the lining portion 7 is a synthetic resin material, as shown in FIG. 7, as in the first embodiment, the recess 7 dA is a flared portion using the mold 103 in molding using the mold 103. It is provided in 7b. The mold 103 of the present embodiment has a convex portion 103bA for forming the concave portion 7dA. The recess 7dA is formed by the protrusion 103bA at the time of injection molding.

  The electromagnetic flowmeter 1 having the above configuration is, as an example, coupled to the pipe 200 as shown in FIG. At this time, the gasket 301 is inserted into the recess 7dA. At this time, the seal surface 7 f of the recess 7 dA and the seal surface 301 a of the gasket 301 are in contact with each other. Also, as an example, the circumferential surface 7g of the recess 7dA abuts on the outer peripheral portion of the gasket 301 to position the gasket 301. In such a configuration, a gasket 301 seals between the flared portion 7 b and the end surface 202 a of the flange 202 of the tube 200. The gasket 301 is replaceable similarly to the O-ring 300.

  As described above, in the present embodiment, the recess 7 dA is provided in the flare portion 7 b using the mold 100 or 103 during molding using the mold 100 or 103. Therefore, according to the present embodiment, as in the first embodiment, the manufacturing process is not complicated in order to form the recess 7 dA. Further, in the present embodiment, a gasket 301 seals between the flare portion 7 b and the end surface 202 a of the flange 202 of the pipe body 200 (to be coupled). As an example, by periodically replacing the gasket 301 with a new one at the time of maintenance of the electromagnetic flow meter 1 or the like, the space between the lining portion 7 (flare portion 7 b) provided on the flange 5 and the end face 202 a of the pipe 200 Stable sealability can be maintained. Thus, according to the present embodiment, it is possible to maintain a stable sealability between the lining portion 7 provided on the flange 5 and the flange 202 while suppressing the complication of the manufacturing process.

Third Embodiment
In the present embodiment, as shown in FIG. 9, the shape of the concave portion 7 dB of the flare portion 7 b is different from the concave portion 7 dA of the second embodiment. In the present embodiment, a convex portion 301 b (FIG. 14) is provided on the seal surface 301 a of the gasket 301. As shown in FIG. 14, a plurality of convex portions 301b are provided at intervals around each other (in FIG. 14, one convex portion 301b is shown). In the present embodiment, a plurality of concave portions 7 dB are provided corresponding to the convex portions 301 b. The concave portion 7 dB accommodates the convex portion 301 b.

  As shown in FIG. 9, a plurality of concave portions 7 dB are provided in a concave shape on the end surface 7 c of the flare portion 7 b. The plurality of recesses 7 dB are spaced from each other around the axis. In the present embodiment, as an example, the convex portion 301 b has a quadrangular prism shape, and the inner surface shape of the concave portion 7 dB also has a quadrangular prism shape correspondingly. The convex portion 301 b and the concave portion 7 dB may have a shape other than a quadrangular prism, such as a cylindrical or hemispherical shape. The concave portion 7 dB is, for example, engaged with the convex portion 301 b to position the gasket 301.

  When the material of the lining portion 7 is rubber, as shown in FIG. 10, the concave portion 7 dB is flared by using the mold 100 during molding using the mold 100 as in the first and second embodiments. Provided in As an example, as shown in FIG. 11, the mold 100 of the present embodiment has a plurality of convex portions 100 bB for forming the concave portions 7 dB. The plurality of convex portions 100bB are provided at an interval from each other around the axial center. The convex portion 100bB is, for example, quadrangular prism. The concave portion 7 dB is formed by the convex portion 100 b B at the time of vulcanization.

  Further, when the material of the lining portion 7 is a synthetic resin material, as shown in FIG. 12, as in the first and second embodiments, the recess 7 dB uses the mold 103 during molding using the mold 103. Is provided in the flare portion 7b. As an example, as shown in FIG. 13, the mold 103 of the present embodiment has a plurality of convex portions 103 b B for forming the concave portions 7 dB. The plurality of convex portions 103bB are provided at an interval from each other around the axial center. The convex portion 103bB has, for example, a square pole shape. The recess 7 dB is formed by the protrusion 103 b B at the time of injection molding.

  As shown in FIG. 14, the electromagnetic flowmeter 1 having the above configuration is connected to the tube 200 as an example. At this time, the convex portion 301 b of the gasket 301 is inserted into the concave portion 7 dB, and the gap between the flare portion 7 b and the end surface 202 a of the flange 202 of the tube 200 is sealed by the gasket 301. The gasket 301 is replaceable.

  As described above, in the present embodiment, the concave portion 7 dB is provided in the flare portion 7 b using the mold 100 or 103 during molding using the mold 100 or 103. Therefore, according to the present embodiment, as in the first and second embodiments, the manufacturing process does not become complicated in order to form the recess 7 dB. Further, in the present embodiment, a gasket 301 seals between the flare portion 7 b and the end surface 202 a of the flange 202 of the pipe body 200 (to be coupled). As an example, by periodically replacing the gasket 301 with a new one at the time of maintenance of the electromagnetic flow meter 1 or the like, the space between the lining portion 7 (flare portion 7 b) provided on the flange 5 and the end face 202 a of the pipe 200 Stable sealability can be maintained. Thus, according to the present embodiment, it is possible to maintain a stable sealability between the lining portion 7 provided on the flange 5 and the flange 202 while suppressing the complication of the manufacturing process.

  Further, in the present embodiment, since the concave portion 7 dB positions the gasket 301 (convex portion 301 b), the gasket 301 can be easily assembled. In addition, since the inner surface of the concave portion 7 dB and the convex portion 301 b have a quadrangular column shape, the concave portion 7 dB can be firmly fitted to the convex portion 301 b, and the convex portion 301 b can be prevented from dropping out from the concave portion 7 dB. it can.

Fourth Embodiment
In the present embodiment, as shown in FIG. 15, the end face 7c of the flared part 7b is substantially flat, and the surface roughness of the contact part 7h in contact with the gasket 301 at this end face 7c is the inner circumferential surface 7a1 of the cylindrical part 7a ( The point smaller than the surface roughness in FIGS. 16 and 17) is different from the second embodiment. The contact portion 7h is, as an example, a region between alternate long and short dash lines in FIG. 15, and has an annular shape. Further, the surface roughness of the contact portion 7h is smaller than the surface roughness of the other portion of the end surface 7c other than the contact portion 7h. The contact portion 7 h may be provided on the entire end surface 7 c of the flare portion 7 b.

  When the material of the lining portion 7 is rubber, as shown in FIG. 16, the contact portion 7 h is a flared portion using the mold 100 during molding using the mold 100 as in the case of the concave portion 7 d of the first embodiment. It is provided in 7b. The mold 100 of the present embodiment has a surface finish 100d for forming the contact portion 7h. The surface finish 100d is a flat surface having a relatively small surface roughness. The surface finisher 100d is, for example, provided on a part of the molding surface 100a. Moreover, the convex part 100b is not provided in the type | mold 100 of this embodiment. During vulcanization, the surface finish 100d of the mold 100 is pressed against the end face 7c of the flared portion 7b, so that the surface shape of the surface finish 100d is transferred to the end face 7c, and the contact 7h is formed on the end face 7c. . When the material of the lining portion 7 is a synthetic resin material, a surface finish portion for forming the contact portion 7 h may be provided in the mold 103 and the contact portion 7 h may be formed by the surface finish portion at the time of injection molding. it can.

  The electromagnetic flowmeter 1 having the above configuration is, as an example, coupled to the tube 200 as shown in FIG. At this time, as an example, a gasket 301 is interposed between the flared portion 7 b and the flange 202, and the contact portion 7 h and the sealing surface 301 a of the gasket 301 are in contact with each other. In such a configuration, a gasket 301 seals between the flared portion 7 b and the end surface 202 a of the flange 202 of the tube 200. The gasket 301 is replaceable.

  As described above, in the present embodiment, the contact portion 7h is provided in the flare portion 7b using the mold 100 or 103 during molding using the mold 100 or 103, and the surface roughness is higher than that of the cylindrical portion 7a. small. Therefore, according to the present embodiment, as in the first embodiment, the manufacturing process is not complicated to form the contact portion 7 h. Further, in the present embodiment, a gasket 301 seals between the flare portion 7 b and the end surface 202 a of the flange 202 of the pipe body 200 (to be coupled). As an example, by periodically replacing the gasket 301 with a new one at the time of maintenance of the electromagnetic flow meter 1 or the like, the space between the lining portion 7 (flare portion 7 b) provided on the flange 5 and the end face 202 a of the pipe 200 Stable sealability can be maintained. Thus, according to the present embodiment, it is possible to maintain a stable sealability between the lining portion 7 provided on the flange 5 and the flange 202 while suppressing the complication of the manufacturing process.

  The concave portions 7d, 7dA and 7 dB in the above embodiments are also rougher than the inner circumferential surface 7a1 of the cylindrical portion 7a when forming the flared portion 7b using the mold 100 or 103 as in the contact portion 7h. May be reduced.

  As described above, according to each of the above-described embodiments, in the electromagnetic flow meter 1, the complexity of the manufacturing process is suppressed, and the space between the lining portion 7 provided on the flange 5 and the flange 202 (to be coupled) Stable sealability can be maintained.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

  DESCRIPTION OF SYMBOLS 1 ... electromagnetic flow meter, 2a ... flow path, 4 ... measurement pipe (pipe), 4c ... end part, 5 ... flange, 5a ... end surface, 7 ... lining part, 7a ... cylinder part (1st part), 7a1 ... inner periphery Face 7b Flare part (second part) 7c End face 7d 7 dA 7 dB Recess 7 e Hole 7 f Seal surface 7 h Contact portion 100, 103 type 101 101 bolt 102 Nut: 202 Flange (target to be coupled) 202a: end face 300: O-ring (seal member) 301: gasket (seal member) 301a: seal surface 301b: convex portion

Claims (6)

A flange through which a fluid to be measured flows and an end face coupled to a coupling object via a seal member, a flange provided at an end of the pipe, a first portion covering the inner circumferential surface of the pipe, and the end face An electromagnetic flow rate having a second portion covering the inner surface and a lining portion provided across the inner circumferential surface and the end surface, and a recess provided in the second portion and in which the seal member is inserted Manufacturing method of the
Affixing a rubber material to the inner circumferential surface of the pipe and the end face;
And a vulcanizing step of vulcanizing the rubber material attached to the inner peripheral surface and the end surface in a state where a mold for molding the second portion and the recess is pressed against the rubber material of the end surface; ,
A method of manufacturing an electromagnetic flow meter , including: The seal member is an O-ring,
The method for manufacturing an electromagnetic flow meter according to claim 1, wherein the recess is annular. The sealing member is an annular gasket having a pair of sealing surfaces,
The recess has a surface in contact with the sealing surface,
The surface, a manufacturing method of an electromagnetic flowmeter according to claim 1, the inner peripheral side of the flow channel and communicating holes of the first portion is provided. The method of manufacturing an electromagnetic flow meter according to any one of claims 1 to 3, wherein a plurality of the concave portions are provided corresponding to a plurality of convex portions provided on the seal member. The method for manufacturing an electromagnetic flow meter according to any one of claims 1 to 4, wherein the recessed portion has a surface roughness smaller than an inner circumferential surface of the first portion. A flange through which a fluid to be measured flows and an end face coupled to a coupling object via a seal member, flanges provided at both ends of the pipe, a first portion covering the inner circumferential surface of the pipe and the end face And a lining portion provided across the inner circumferential surface and the end face, and the second portion, the surface roughness being smaller than the inner circumferential surface of the first portion A method of manufacturing an electromagnetic flow meter comprising: a contact portion in contact with the seal member;
Affixing a rubber material to the inner circumferential surface of the pipe and the end face;
Vulcanizing step of vulcanizing the rubber material stuck to the inner peripheral surface and the end surface in a state where a mold for molding the second portion and the contact portion is pressed against the rubber material of the end surface When,
A method of manufacturing an electromagnetic flow meter , including:

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