JP2016218019A - Ultrasonic transducer installation method and ultrasonic transducer installation kit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic transducer installation method that allows an ultrasonic transducer to be accurately installed in piping.SOLUTION: An ultrasonic transducer installation method includes: installing, in piping, a jig comprising a holding unit capable of holding an ultrasonic transducer and sliding in a certain direction; having the holding unit hold a polishing machine and having the polishing machine come into contact with the surface of a pipe; sliding the polishing machine held by the holding unit on the pipe and polishing the surface of the pipe; and removing the polishing machine from the holding unit, having the holding unit hold the ultrasonic transducer, and having the ultrasonic transducer come into contact with the surface of the pipe.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a fluid measurement technique, and more particularly to an ultrasonic transducer installation method and an ultrasonic transducer installation kit.

  The clamp-on type ultrasonic flowmeter includes ultrasonic transducers arranged on the upstream side and the downstream side outside the pipe. Since the clamp-on type flow meter generally uses ultrasonic waves, hereinafter, the “clamp-on type ultrasonic flow meter” may be simply abbreviated as “clamp-on type flow meter” in the present specification. The clamp-on type flow meter sends ultrasonic waves toward the fluid flowing in the piping, and the propagation time of the ultrasonic waves that propagate in the upstream to downstream direction of the fluid and the propagation of the ultrasonic waves that propagate in the opposite direction from the downstream direction Based on the time, the flow velocity and flow rate of the fluid flowing in the pipe are calculated (for example, see Patent Documents 1 and 2).

  The clamp-on type flow meter only needs to press the ultrasonic transducer to the outside of the pipe, so there is no need to cut the pipe when installing it. For example, even if the fluid flowing in the pipe is toxic, Has the advantage of not having to worry about leakage of toxic fluids from Further, there is an advantage that it is not necessary to stop the use of the pipe while the ultrasonic transducer is installed, and since the transducer does not touch the fluid flowing through the cavity in the pipe, the fluid to be measured may be corrosive. And the advantage that the purity of the fluid to be measured is not affected, and because no structure is inserted in the pipe, there is an advantage that no pressure loss occurs.

European Patent No. 1173733 JP 7-260532 A

  As a result of intensive studies, the present inventor has found that the surface state of the pipe on which the ultrasonic transducer is installed varies, and the ultrasonic transducer cannot be accurately installed depending on the surface state of the pipe. Accordingly, an object of the present invention is to provide an ultrasonic transducer installation method and an ultrasonic transducer installation kit capable of accurately installing an ultrasonic transducer in a pipe.

  According to the aspect of the present invention, (a) a holding portion that can hold an ultrasonic transducer, and a jig provided with a holding portion that is slidable in a certain direction is installed in the pipe; and (b) the holding portion is polished. Holding the tool and bringing the polishing machine into contact with the pipe surface; (c) sliding the polishing machine held on the holding part on the pipe to polish the pipe surface; and (d) polishing from the holding part. Removing the vessel, holding the ultrasonic transducer in the holding section, and bringing the ultrasonic transducer into contact with the polished pipe surface.

  In the above ultrasonic transducer installation method, the shape of the part held by the holding part of the polishing device may be the same as the shape of the part held by the holding part of the ultrasonic transducer. The holding part may be provided with a clamp screw that presses the ultrasonic transducer against the pipe surface, and the grinder may be pressed against the pipe surface with such a strength that the grinder can slide on the pipe. The polisher may include an electric polishing member.

  According to the aspect of the present invention, (a) a jig for fixing the ultrasonic transducer to the pipe surface, which is a holding portion capable of holding the ultrasonic transducer, and can be slid in a certain direction on the pipe There is provided an installation kit for an ultrasonic transducer, comprising: a jig provided with a portion; and (b) a polisher held by a holding portion.

  In the ultrasonic transducer installation kit, the shape of the portion held by the holding portion of the polishing device may be the same as the shape of the portion held by the holding portion of the ultrasonic transducer. The holding part may be provided with a clamp screw that presses the ultrasonic transducer against the pipe surface, and the grinder may be pressed against the pipe surface with such a strength that the grinder can slide on the pipe. The polisher may include an electric polishing member.

  ADVANTAGE OF THE INVENTION According to this invention, the installation method of an ultrasonic transducer and the installation kit of an ultrasonic transducer which can install an ultrasonic transducer correctly in piping can be provided.

It is a typical top view of piping in which the clamp-on type ultrasonic flowmeter concerning an embodiment of the invention is installed. It is typical sectional drawing of piping where the clamp-on type ultrasonic flowmeter which concerns on embodiment of this invention seen from the II-II direction of FIG. 1 is installed. It is a typical top view of piping provided with the jig | tool for installing the clamp-on type ultrasonic flowmeter which concerns on embodiment of this invention. It is the typical side view of piping provided with the jig | tool for installing the clamp-on type ultrasonic flowmeter which concerns on embodiment of this invention seen from the orthogonal | vertical direction with respect to the longitudinal direction of piping. It is the typical side view of the holding | maintenance part of the jig | tool for installing the clamp-on type ultrasonic flowmeter which concerns on embodiment of this invention seen from the longitudinal direction of piping. It is a typical top view of the polisher hold | maintained at the jig | tool provided in piping which concerns on embodiment of this invention. It is a typical side view of the polisher hold | maintained at the jig | tool provided in the piping which concerns on embodiment of this invention seen from the orthogonal | vertical direction with respect to the longitudinal direction of piping. It is a typical side view of the polisher hold | maintained at the holding | maintenance part of the jig | tool which concerns on embodiment of this invention seen from the longitudinal direction of piping. It is a typical side view of the polisher concerning an embodiment of the invention. It is a typical side view of the polisher hold | maintained at the jig | tool provided in the piping which concerns on embodiment of this invention seen from the orthogonal | vertical direction with respect to the longitudinal direction of piping. It is a typical side view of the polisher hold | maintained at the jig | tool provided in the piping which concerns on embodiment of this invention seen from the orthogonal | vertical direction with respect to the longitudinal direction of piping. FIG. 3 is a schematic side view of an ultrasonic transducer held by a jig provided in a pipe according to an embodiment of the present invention, viewed from a direction perpendicular to the longitudinal direction of the pipe. It is typical sectional drawing of piping provided with the non-parallel polishing surface which concerns on the reference example of this invention. It is typical sectional drawing of the ultrasonic transducer arrange | positioned at the non-parallel polishing surface provided in piping which concerns on the reference example of this invention. It is typical sectional drawing of piping provided with the parallel grinding | polishing surface which concerns on embodiment of this invention. It is typical sectional drawing of the ultrasonic transducer arrange | positioned at the parallel grinding | polishing surface provided in piping which concerns on embodiment of this invention. It is typical sectional drawing of the ultrasonic transducer arrange | positioned diagonally on the parallel grinding | polishing surface provided in piping which concerns on the reference example of this invention. It is a graph which shows the waveform of the intensity | strength of the ultrasonic signal which concerns on the comparative example of this invention. It is a graph which shows the waveform of the intensity | strength of the ultrasonic signal which concerns on the Example of this invention.

  Embodiments of the present invention will be described below. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic. Therefore, specific dimensions and the like should be determined in light of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

  The method of installing the ultrasonic transducer in the pipe of the clamp-on type ultrasonic flowmeter according to the embodiment is a holding part capable of holding the ultrasonic transducer and piping a jig provided with a holding part capable of sliding in a certain direction. Installing the polishing machine, holding the polishing machine in the holding unit, bringing the polishing machine into contact with the pipe surface, sliding the polishing machine held in the holding unit on the pipe, and polishing the pipe surface; Removing the polisher from the holding unit, holding the ultrasonic transducer in the holding unit, and bringing the ultrasonic transducer into contact with the polished pipe surface.

  As shown in FIG. 1 and FIG. 2 as viewed from the II-II direction, the pipe 10 on which the clamp-on ultrasonic flowmeter is installed has a circular cross-sectional shape. As shown in FIG. 3 which is a top view and FIG. 4 which is a side view, the jig 30 for installing the clamp-on type ultrasonic flowmeter according to the embodiment includes a first frame 31A and a second frame. 31B is provided. Each of the first frame 31 </ b> A and the second frame 31 </ b> B includes a portion that engages with the pipe 10. The first frame 31 </ b> A and the second frame 31 </ b> B are arranged symmetrically with respect to the central axis of the pipe 10.

  The first frame 31 </ b> A and the second frame 31 </ b> B are provided with holes in a direction perpendicular to the longitudinal direction of the pipe 10. The connecting rods 41 and 42 are passed through these holes, and the relative positions of the first frame 31A and the second frame 31B in the longitudinal direction of the pipe 10 are fixed. Further, the nut 43 is tightened from above the first frame 31A at one end of the connecting rod 41, and the nut 45 is tightened from below the second frame 31B at the other end of the connecting rod 41. Further, the nut 44 is tightened from above the first frame 31A at one end of the connecting rod 42, and the nut is tightened from below the second frame 31B at the other end of the connecting rod 42. Thereby, the first frame 31 </ b> A and the second frame 31 </ b> B are pressed against the pipe 10 and fixed on the pipe 10.

  Two rod-shaped rails 32A and 33A are fixed in the frame of the first frame 31A. On the rails 32 </ b> A and 33 </ b> A, a holding portion 34 </ b> A capable of holding an ultrasonic transducer can slide in the longitudinal direction of the pipe 10. Two rod-shaped rails are also fixed in the frame of the second frame 31 </ b> B, and a holding portion 34 </ b> B capable of holding an ultrasonic transducer can slide on the rail in the longitudinal direction of the pipe 10. The direction in which the holding portion 34A slides and the direction in which the holding portion 34B slides are parallel.

  As shown in FIG. 5 which is a side view seen from the longitudinal direction of the pipe 10, the holding portion 34 </ b> A includes a reverse groove member 134 </ b> A. Slide blocks 135A and 137A are fixed to the side wall of the reverse groove member 134A. The slide block 135A is provided with a hole 136A through which the rail 33A shown in FIG. 3 passes, and the slide block 137A shown in FIG. 5 is provided with a hole 138A through which the rail 32A shown in FIG. 3 passes. Yes. A clamp screw 36A for pressing the ultrasonic transducer against the surface of the pipe 10 is provided on the upper surface of the reverse groove type member 134A shown in FIG. Further, the positioning rod 35A penetrates the side walls on both sides of the inverted groove member 134A. The positioning rod 35 </ b> A can be moved in a direction perpendicular to the longitudinal direction of the pipe 10 by being pressed by the clamp screw 36 </ b> A, for example. The structure of the holding portion 34B shown in FIG. 4 is the same as that of the holding portion 34A.

  In the embodiment, before the ultrasonic transducers are held by the holding portions 34A and 34B, the grinders 50A and 50B are held by the holding portions 34A and 34B as shown in FIGS. The polishers 50A and 50B include a block made of a metal such as aluminum. For example, the widths of the grinders 50A and 50B are the same as the inner width of the reverse groove type member of the holding portions 34A and 34B, and the grinders 50A and 50B are disposed inside the reverse groove type members of the holding portions 34A and 34B. Inserted.

  As shown in FIG. 9, which is a side view as viewed from a direction perpendicular to the longitudinal direction of the pipe 10, a polishing surface 51 </ b> A, in which a polishing member such as a file is fixed, is provided on the bottom surface of the polishing machine 50 </ b> A. As the polishing member, a diamond polishing member, a paper file, or the like can be used. The polishing member is replaceable, for example, and the roughness or material of the file may be changed according to the surface state of the pipe 10. Further, a recess 52A shown in FIG. 9 is provided on the upper surface of the polishing machine 50A to engage with positioning rods 35A penetrating the side walls on both sides of the inverted groove member 134A shown in FIG. The structure of the polishing machine 50B shown in FIG. 7 is the same as that of the polishing machine 50A. The shapes of the portions held by the holding portions 34A and 34B of the polishing machines 50A and 50B are the same as the shapes of the portions held by the holding portions 34A and 34B of the ultrasonic transducer described later, for example.

  The grinder 50A is pressed against the surface of the pipe 10 by a clamp screw 36A through the positioning rod 35A with such a strength that it can slide on the pipe 10. Further, the polishing machine 50B is pressed against the surface of the pipe 10 by a clamp screw 36B with a strength that can slide on the pipe 10 via the positioning rod 35B.

  Thereafter, as shown in FIGS. 10 and 11, the polishing machine 50 </ b> A is slid on the surface of the pipe 10 while pressing the polishing machine 50 </ b> A against the surface of the pipe 10 with the clamp screw 36 </ b> A to polish the surface of the pipe 10. Further, while pressing the polishing machine 50B against the surface of the pipe 10 with the clamp screw 36B, the polishing machine 50B is also slid on the surface of the pipe 10 to polish the surface of the pipe 10 on the side where the polishing machine 50B is held. The number of times the grinders 50A and 50B are reciprocated on the surface of the pipe 10 is appropriately determined according to the surface state of the pipe 10. For example, the pipe 10 is polished by the polishing machines 50A and 50B until a plane portion is formed. The plane part of the surface of the pipe 10 formed by polishing with the polishing machine 50A and the plane part of the surface of the pipe 10 formed by polishing with the polishing machine 50B are parallel to each other.

  After the surface of the pipe 10 has been polished, the polishers 50A and 50B are removed from the holding portions 34A and 34B. Next, with the first and second frames 31A and 31B fixed to the pipe 10, as shown in FIG. 12, the first ultrasonic transducer 101 is held by the holding portion 34A, and the second ultrasonic wave is held by the holding portion 34B. The ultrasonic transducer 102 is held. Thereafter, the first and second ultrasonic transducers 101 and 102 are slid to adjust the relative positions of the first and second ultrasonic transducers 101 and 102, and the first ultrasonic transducer 101 is moved by the clamp screw 36A. The second ultrasonic transducer 102 is pressed against the polishing surface on the surface of the pipe 10 with the clamp screw 36B and pressed against the polishing surface on the surface of the pipe 10. The first and second ultrasonic transducers 101 and 102 are arranged symmetrically with respect to the central axis of the pipe 10 and their bottom surfaces are parallel to each other.

  For example, the first ultrasonic transducer 101 is arranged on the upstream side of a fluid containing a gas or liquid flowing in the pipe 10, and the second ultrasonic transducer 102 is arranged on the downstream side. The first ultrasonic transducer 101 obliquely enters the first ultrasonic signal at a predetermined angle with respect to the pipe 10 through which the fluid flows. The second ultrasonic transducer 102 is disposed at a position capable of receiving the first ultrasonic signal, and obliquely inclines the second ultrasonic signal with respect to the pipe 10 at the same angle as the incident angle of the first ultrasonic signal. Incident.

  The first ultrasonic signal emitted from the first ultrasonic transducer 101 is received by the second ultrasonic transducer 102 via the pipe 10. The second ultrasonic signal emitted from the second ultrasonic transducer 102 is received by the first ultrasonic transducer 101 via the pipe 10. For example, the first ultrasonic transducer 101 and the second ultrasonic transducer 102 are alternately applied with drive signals and alternately generate ultrasonic signals.

  The first ultrasonic signal emitted from the first ultrasonic transducer 101 propagates through the cavity in the pipe 10 according to the flow of the fluid. On the other hand, the second ultrasonic signal emitted from the second ultrasonic transducer 102 propagates through the hollow portion in the pipe 10 against the fluid flow. Therefore, in the hollow portion in the pipe 10, a difference due to the flow velocity of the fluid occurs between the propagation time of the first ultrasonic signal and the propagation time of the second ultrasonic signal. Therefore, by measuring the difference between the propagation times of the first and second ultrasonic signals, the flow velocity and flow rate of the fluid flowing through the cavity in the pipe 10 can be calculated.

  According to the installation method of the ultrasonic transducer of the clamp-on type ultrasonic flowmeter according to the embodiment described above to the pipe, the pipe 10 can be used even if the surface of the pipe 10 is initially rough or rusted. By polishing the surface, the adhesion between the first and second ultrasonic transducers 101 and 102 and the pipe 10 can be improved. In addition, when the surface of the pipe 10 is not polished, the first and second ultrasonic transducers 101 and 102 may only be in line contact with the circular pipe 10, but the surface of the pipe 10 is flat. By polishing until formed, the contact area between the first and second ultrasonic transducers 101 and 102 having a flat bottom surface and the surface of the pipe 10 is widened, and the first and The second ultrasonic transducers 101 and 102 can be brought into close contact with no gap. Therefore, an ultrasonic signal can be efficiently sent into the pipe 10 from the first and second ultrasonic transducers 101 and 102, and the measurement range and measurement accuracy of the flow velocity and flow rate of the fluid can be improved. Become.

  Further, for example, when the pipe 10 is polished without using a jig, the first polishing surface 11A and the second polishing surface 11B may not be parallel as shown in FIG. As shown in FIG. 14, when the first and second ultrasonic transducers 101 and 102 are arranged on the first and second polishing surfaces 11A and 11B that are not parallel, the first and second ultrasonic transducers 101, 102 is also not parallel. In this case, the propagation path of the first ultrasonic signal emitted from the first ultrasonic transducer 101 and the propagation path of the second ultrasonic signal emitted from the second ultrasonic transducer 102 are different. In some cases, the fluid flow rate or flow rate cannot be measured accurately.

  On the other hand, according to the installation method of the ultrasonic transducer of the clamp-on type ultrasonic flowmeter according to the embodiment to the piping, as shown in FIG. 6 to FIG. The surface of the pipe 10 is polished by the polishing machines 50A and 50B held by 34B. Therefore, as shown in FIG. 15, the polishing surface 11A of the pipe 10 polished by the polishing machine 50A and the polishing surface 11B of the pipe 10 polished by the polishing machine 50B are parallel to each other. Therefore, as shown in FIG. 16, the propagation path of the first ultrasonic signal emitted from the first ultrasonic transducer 101 disposed on the polishing surface 11A and the second path disposed on the polishing surface 11B. The propagation paths of the second ultrasonic signals emitted from the ultrasonic transducer 102 coincide with each other, and the fluid flow velocity or flow rate can be accurately measured.

  In addition, for example, if the jig for holding the polisher and the jig for holding the ultrasonic transducer are different, even if the surface of the pipe can be polished in parallel, the jig holding the polisher is removed from the pipe. Thus, it may be difficult to accurately install the jig holding the ultrasonic transducer at the same position on the pipe. Therefore, as shown in FIG. 17, the first and second ultrasonic transducers 101 and 102 are in point contact with the corner of the polished surface of the pipe 10, and the polished surface of the pipe 10 and the first and second There is a case where a gap is generated between the second ultrasonic transducers 101 and 102 and the ultrasonic signals cannot be efficiently sent from the first and second ultrasonic transducers 101 and 102 into the pipe 10.

  On the other hand, according to the installation method of the ultrasonic transducer of the clamp-on type ultrasonic flowmeter according to the embodiment to the pipe, the first and second frames 31A and 31B shown in FIG. As it is, by replacing the polishing machines 50A and 50B with the first and second ultrasonic transducers 101 and 102 shown in FIG. 12, the polishing surface of the pipe 10 and the first and second ultrasonic transducers 101 and 102 are replaced. Is parallel to the bottom. Therefore, the first and second ultrasonic transducers 101 and 102 can be reliably disposed on the polished surface of the pipe 10.

(Example)
FIG. 18 shows a graph of the result of measuring the intensity of the ultrasonic signal transmitted through the pipe by arranging the ultrasonic transducer in the unpolished 50A stainless steel pipe. Next, with the jig described in the embodiment, a polished surface having a width of 9 mm was formed on a 50A stainless steel pipe, an ultrasonic transducer was disposed on the polished surface, and the intensity of the ultrasonic signal propagated through the pipe was measured. The resulting graph is shown in FIG. The vertical and horizontal axes in FIGS. 18 and 19 are the same. 18 and 19 show that when the contact area between the pipe and the ultrasonic transducer increases due to polishing, the intensity of the ultrasonic signal propagated through the pipe increases.
(Other embodiments)
Although the present invention has been described by the embodiments as described above, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques should be apparent to those skilled in the art. For example, the polishers 50A and 50B shown in FIGS. 6 to 11 may include an electric polishing member. For example, the electric polishing member may vibrate or rotate while the polishing machines 50A and 50B slide on the pipe 10. The power source of the electric polishing member may be a power source of an ultrasonic transducer. Thus, it should be understood that the present invention includes various embodiments and the like not described herein.

10 Piping 11A, 11B Polishing surface 30 Jig 31A, 31B Frame 32A, 33A Rail 34A, 34B Holding portion 35A, 35B Positioning rod 36A, 36B Clamp screw 41, 42 Connecting rod 43, 44, 45 Nut 50A, 50B Polisher 51A Polishing surface 101 First ultrasonic transducer 102 Second ultrasonic transducer 134A Reverse groove type member 135A, 137A Slide block 136A, 138A Hole

Claims (8)

A holding part capable of holding an ultrasonic transducer, and installing a jig in a pipe having a holding part that can slide in a certain direction;
Holding the polishing machine in the holding part, bringing the polishing machine into contact with the pipe surface;
Sliding the grinder held by the holding part on the pipe to polish the pipe surface;
Removing the polisher from the holding unit, holding the ultrasonic transducer in the holding unit, and bringing the ultrasonic transducer into contact with the polished pipe surface;
An installation method of an ultrasonic transducer comprising:   The ultrasonic transducer installation method according to claim 1, wherein a shape of a portion held by the holding portion of the polishing machine is the same as a shape of a portion held by the holding portion of the ultrasonic transducer. The holding part includes a clamp screw that presses the ultrasonic transducer against the pipe surface;
By the clamp screw, the polishing machine is pressed against the pipe surface with such a strength that it can slide on the pipe.
The installation method of the ultrasonic transducer of Claim 1 or 2.   The installation method of the ultrasonic transducer of any one of Claim 1 thru | or 3 with which the said polisher is equipped with an electrically-driven polishing member. A jig for fixing the ultrasonic transducer to the pipe surface, a holding part capable of holding the ultrasonic transducer, and a jig provided with a holding part that can slide in a certain direction on the pipe;
A polishing machine held by the holding unit;
An ultrasonic transducer installation kit comprising:   The ultrasonic transducer installation kit according to claim 5, wherein a shape of a portion held by the holding portion of the polishing machine is the same as a shape of a portion held by the holding portion of the ultrasonic transducer. The holding part includes a clamp screw that presses the ultrasonic transducer against the pipe surface;
By the clamp screw, the polishing machine is pressed against the pipe surface with such a strength that it can slide on the pipe.
The ultrasonic transducer installation kit according to claim 5 or 6.   The ultrasonic transducer installation kit according to any one of claims 5 to 7, wherein the polishing machine includes an electric polishing member.