JPH0454410Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to an ultrasonic flowmeter having a detector attached to the outer periphery of piping to detect the flow velocity of a fluid using ultrasonic waves.

[Prior art and its problems]

Ultrasonic flowmeters are suitable for measuring the flow rate of fluid in piping, which is becoming larger in diameter as modern equipment becomes mammoth. The detector consists of an ultrasonic transmitter/receiver, which is installed around the outer circumference of the pipe, and transmits ultrasonic pulses from the upstream and downstream sides of the fluid, detects the time difference caused by the flow velocity, and measures the flow rate. Figure 1 is JP-A-56-
A perspective view of a conventional ultrasonic flowmeter with a detector installed as disclosed in Publication No. 133620, FIG. 2 is a direction of the arrow P in FIG.
A closer side view is shown. In FIGS. 1 and 2, the detectors 3A and 3B are connected to a pair of fixtures 2A and 2.
B is attached on the outer periphery of the pipe 1 through which the fluid to be measured flows. Both fittings 2A, 2B
are connected to each other by a pin 6 at one end, and the other end, that is, the free end, is openable and closable. Both fittings 2A and 2B are arranged on the pipe 1 so as to sandwich the pipe 1, and are tightened and fixed by a tightening bolt 5. At this time, a positioning plane 11 is provided on the inner wall of the fittings 2A, 2B facing the pipe 1, and the fittings 2A, 2B are positioned with respect to the pipe 1 by this positioning plane 11. The detectors 3A, 3B are inserted into through holes 10A, 10B provided in the fixture 2A, and are inserted into the pressing tools 9A, 9B.
It is pressed onto the pipe 1 and fixed. Note that an acoustic coupling medium 7 such as grease, epoxy adhesive, or metal foil is interposed between the detectors 3A, 3B and the pipe 1 to achieve acoustic coupling. 8 is a signal cable coupled to the detectors 3A and 3B.
Such fixtures 2A and 2B are of a hinge type using a pin 6. Therefore, the accuracy of the mounting position of the detectors 3A, 3B is influenced by variations in the outer diameter of the pipe 1. Furthermore, the acoustic coupling may become uncertain due to non-uniform compression of the acoustic coupling medium 7. Furthermore, the fittings 2A and 2B are relatively heavy and are not suitable for use with large-diameter piping because they are relatively expensive. In addition, maintenance of the crimped portions of the piping 1 and the detectors 3A, 3B requires the removal of the entire detectors 3A, 3B from the fixtures 2A, 2B, which is a time-consuming process.

[Purpose of invention]

In view of the above points, the present invention effectively solves the problems of the prior art, has a simple and lightweight structure,
It is an object of the present invention to provide an ultrasonic flowmeter that is applicable to large diameters and ensures the accuracy of the detector mounting position.

[Key points of the idea]

In order to achieve this purpose, the present invention
A band-shaped clamp member wrapped around and fixed to the outer circumference of the pipe, a box-shaped detector holding means fixed to the clamp member along the axial direction of the pipe and having a long hole in the upper surface, and an inside of the detector holding means. a block material housed in the detector and suspending the detector with bolts; a fixing means for fixing the block material to the detector holding means; and a fixing means for fixing the block material to the detector holding means; and a pressing means for pressing the container onto the piping.

[Example of idea]

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

FIG. 3 shows the basic structure of an embodiment of the present invention, in which A is a front view thereof and B is a sectional view taken along line X-X of A. In the figure, the clamp member 12 includes two semicircular belt-shaped clamp pieces 13, 13, and a flange 14 formed at both ends of each clamp piece 13, 13 for connecting both clamp pieces 13, 13. 14, a tightening member that passes through the flanges 14, 14 and fixes the clamp pieces 13, 13 so as to sandwich the outer periphery of the pipe 1, in this embodiment, a bolt 15, a nut 16, and the flanges 14, 1.
It consists of positioning pins 17 provided at 4 and the like. This positioning pin 17 allows the end surfaces of the clamp pieces 13, 13 to maintain a right angle with the axis of the pipe 1. In addition, the detector holding means 1
Reference numeral 8 indicates detector storage boxes 19, 19 and block material 2 provided inside the detector storage boxes 19, 19.
0, 20, push bolts 24, 24 screwed into the block materials 20, 20, etc. The detector housing boxes 19, 19 are fixed to the clamp pieces 13, 13, respectively, in the axial direction of the piping 1, that is, at right angles to the end faces of the clamp pieces 13, 13, and are mainly formed into channels having a U-shaped cross section. Detector 3
A, 3B can be accommodated. Also, block material 20
are U-shaped detector storage boxes 19, 19.
A set screw 22 so as to be movable along a long hole 21 provided along the axial direction of the pipe 1 on the upper surface of the pipe 1;
Hanging bolts (not shown) that hold the detectors 3A and 3B are attached. In that case,
The set screw 22 passes through the elongated hole 21 from the outside of the detector storage box 19 and is screwed into the block material 20, but a washer (not shown) is provided between the set screw 22 and the top surface of the detector storage box 19. ) is arranged, so that when the set screw 22 is screwed in, the washer and the block material 20 will sandwich the upper surface of the detector storage box 19, and the block material 20 will be inserted into the detector storage box 19. Fixed. The push bolt 24 applies pressure to the detectors 3A and 3B with its tip, and the piping 1
An acoustic coupling medium, for example, metal foil 7, is crimped onto the outer periphery of the substrate for acoustic coupling. On both sides of the U-shape that forms the detector storage box 19, there are two leg pieces in the center.
7 is extended to have the same width as the clamp piece 13, and each leg piece 27 has a small elongated hole 28 on both sides. Then, the detector storage box 19 is fixed to the clamp piece 13 by the fixing screw 26 through the elongated hole 28.

Note that the elongated hole 21 of the detector storage box 19 is connected to the detector 3.
A and 3B are provided at positions where they do not ride on the clamp piece 13.

FIG. 4 shows a specific configuration diagram of the main parts of an embodiment of the present invention shown in FIG. 3, and A is a front sectional view thereof;
B is a YY cross-sectional view of A. In FIG. 4, parts having the same functions as those in FIG. 3 are given the same reference numerals. As can be seen from this Fig. 4, the set screws 22, 22 and the hanging bolts 23, 2
3 are arranged in a cross shape with the push bolt 24 at the center, and the hanging bolts 23, 23 are passed through stepped through holes bored in the block material 20 on both sides of the push bolt 24, respectively. Each head of the hanging bolts 23, 23 is seated in the stepped portion of the stepped through hole. The tips of the hanging bolts 23, 23 are screwed into the detector 3A, respectively.
Therefore, by seating the heads of the hanging bolts 23, 23 in the stepped through holes of the block material 20, the hanging bolts 23, 23 can hang the detector 3A.

Note that 29 is a cover that covers the detector portion of the detector housing box 19, and is fixed to both sides of the detector housing box 19 with screws 30. 31 is a cable connected to the detector 3A, and 32 is a cable conduit with heat radiation fins for this cable 31.

Next, when attaching the detector 3 to the outer periphery of the pipe 1, the set screw 22 and push bolt 24 are removed from the block material 20, and the block material 20 is taken out from the detector storage box 19. Then, the threaded portion of the hanging bolt 23 is screwed into the threaded hole on the top surface of the detector 3A through the stepped through hole provided in the block material 20.
After this screwing, the assembly consisting of the detector 3A, the hanging bolt 23 and the block material 20 is housed inside the detector storage box 19, and the block material 20
A set screw 22 and a push bolt 24 are screwed into the detector storage box 19 through a long hole 21 formed in the upper surface thereof. Similarly, a detector 3B corresponding to this detector 3A is installed inside the detector storage box 19.
It is accommodated from the side opposite to A, and is inserted through the elongated hole 21.
The set screw 22 and push bolt 24 are screwed together. The mounting position between the detectors 3A and 3B is adjusted by holding the push bolt 24 and moving the detectors 3A and 3B arbitrarily along the elongated hole 21. After this adjustment, the push bolts 24 press the detectors 3A, 3B to the pipe 1 via the metal foil 7, so that they are acoustically coupled. Furthermore, the block material 20 is
is tightened to the detector storage box 19, and the push bolt 24
lock. Note that a hemispherical protrusion (not shown) is provided on the detectors 3A, 3B at the portion where the push bolt 24 presses the detectors 3A, 3B, and a hemispherical recess (also not shown) is provided at the tip of the push bolt 24. Therefore, even if the outer periphery of the pipe 1 is slightly deformed, the pressing force is stable, and the springiness of the detector storage box 19 provides an even more stable pressing force. Moreover, the detector portion of the detector storage box 19 is covered with a dustproof cover 29 to protect it from dust and the like in the external atmosphere.

FIG. 5 shows a schematic configuration of another embodiment of the present invention, in which A is a front view thereof and B is a side sectional view thereof. In FIG. 5, parts having the same functions as those in FIG. 3 are given the same reference numerals. In this embodiment, a plurality of flat surfaces 25, eight in this embodiment, are equally provided on the outer periphery of the clamp pieces 13, 13 of the clamp member 12. Accordingly, the detector holding means 18 can be flanged and fixed to any corresponding flat surface 25 by respective fixing screws 26. The other parts are the same as the embodiment shown in FIGS. 3 and 4.

[Effect of idea]

As explained above, the present invention includes a band-shaped clamp member wrapped around and fixed to the outer circumference of the pipe, and a box-shaped detection member fixed to the clamp member along the axial direction of the pipe and having a long hole on the top surface. a detector holding means, a block material housed inside the detector holding means and suspending the detector with a bolt, a fixing means for fixing the block material to the detector holding means, and the detector holding means By comprising a long hole and a pressing means for penetrating the block material and pressing the detector onto the pipe, the position of the detector can be changed within the range of the long hole, and therefore the detection The accuracy of the mounting position between the instruments is guaranteed within the range of component dimensional accuracy, and the conventional marking work on piping can be omitted.In addition, it is lighter and has a larger diameter than conventional hinge-type fittings. It can also be applied to
It has the advantages of being easy to manufacture, allowing the detector to be removed and maintained independently, and improving the stability of the crimp force of the detector.

Note that by adding a detector to the detector storage box, it is easy to expand this flowmeter to a multi-line system.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional ultrasonic flowmeter with a detector installed; Fig. 2 is a side view taken from the direction of arrow P in Fig. 1;
Fig. 3 shows the principle configuration of an embodiment of the present invention, Fig. 3A is a front view thereof, Fig. 3B is a cross-sectional view taken along line XX of A,
4 shows a more specific schematic configuration of the main part of the embodiment shown in FIG. 3, FIG. 4A is a front view thereof, FIG. The schematic structure of the embodiment is shown, and FIG. 1A is a front sectional view thereof, and FIG. 1... Piping, 3A, 3B... Detector, 12...
Clamp member, 13... Clamp piece, 18... Detector holding means, 19... Detector housing plate, 20...
Block material, 22... Set screw, 23... Hanging bolt, 24... Push bolt.

Claims (1)

[Claims for Utility Model Registration] 1. An ultrasonic flowmeter having a detector that detects the flow velocity of fluid inside a pipe by transmitting and receiving ultrasonic waves, comprising: a band-shaped clamp member wrapped and fixed around the outer circumference of the pipe; a box-shaped detector holding means fixed to the clamp member along the axial direction of the piping and having a long hole on the top surface; a block material housed inside the detector holding means and suspending the detector with a bolt; , comprising fixing means for fixing the block material to the detector holding means, and pressing means for penetrating the elongated hole of the detector holding means and the block material to press the detector onto the piping. An ultrasonic flow meter featuring: 2 Utility Model Registration Scope of Claim 1 In the flowmeter according to claim 1, the fixing means is screwed into the block material from the outside of the detector holding means through its elongated hole, and the block material is attached to the detector holding means. An ultrasonic flowmeter characterized by a set screw that is fixed to the. 3 Utility Model Registration The ultrasonic flowmeter according to claim 1 or 2, wherein the pressing means comprises a push bolt.