JPH0511246B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transducer/receiver mounting device for an ultrasonic flowmeter, and in particular, to a transducer mounting device for an ultrasonic flowmeter, in particular, the entire device is fixed to the outer surface of a pipe to be measured using a chain or other cable member. The present invention also relates to an ultrasonic flowmeter transducer mounting device for fixedly mounting two ultrasonic transducers for transmission and reception.

[Conventional technology]

Conventional transducer mounting devices for ultrasonic flowmeters are disclosed in, for example, Japanese Utility Model Publication No. 1986-6857 and Japanese Utility Model Application Publication No. 1983-1999.
There are various types as disclosed in Japanese Patent No. 41724.

All of these disclose methods for efficiently attaching a transducer attachment device to a large-diameter pipe, and have achieved some results in this respect.

[Problem that the invention seeks to solve]

However, in each of the above conventional examples, based on the logic that large also serves as small, as mentioned above, the measurement tube has a relatively large diameter. This has the disadvantage that the transducer may become unstable and cause malfunctions, and it is necessary to use a single unit to handle many types of pipes from small to medium diameters. It has become almost impossible to do so, and therefore, in such a case, it is troublesome that a plurality of transducer mounting devices must always be prepared.

The present invention improves the disadvantages of the conventional example, and in particular, a single mounting device can be used for a large number of pipes to be measured with different diameters, from small diameter pipes to medium diameter pipes, or from medium diameter pipes to large diameter pipes. The object of the present invention is to provide a transducer mounting device for an ultrasonic flowmeter that can sufficiently cover the area.

[Means for solving problems]

Therefore, in the present invention, a block-shaped spacer member is provided at both ends of two opposing frame plates, and a transducer is detachably installed in the center of each frame plate. In the transducer mounting device, on the surface of each spacer member that comes into contact with the tube to be measured,
The purpose is to achieve the above object by adopting a configuration such as forming a V-shaped cut surface.

[First Embodiment of the Invention] The first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
This will be explained based on the diagram.

In these figures, 1 indicates a pipe to be measured, 2 indicates a liquid such as water flowing inside the pipe to be measured 1 (see Fig. 4), and 3 indicates a transducer mounting device of an ultrasonic flowmeter. show.

The transducer mounting device 3 includes a frame 4, two sets of frame fixing means 5 and 6 for fixing both ends of the frame 4 to the tube 1 to be measured, and It is comprised of two sets of transducer/receiver attachment means 8, 9 for mounting and fixing the acoustic wave transducers 7A, 7B.

Of these, the frame 4 is composed of a pair of frames 40, 41 having an L-shaped cross section, and spacer members 42, 43 fixed to both ends of each frame 40, 41 by screws as shown in the figure. It is formed. The frame plates 40, 41 are made of members having an L-shaped cross section, and one of the protrusions 40A, 41A (see FIG. 4) is arranged so as to protrude toward the outside as shown in the figure, and the other protrusion Sections 40A and 41B are provided facing each other. Then, this other protrusion 40
A pair of ultrasonic transducers 7A and 7B for transmitting and receiving the waves described above are arranged between the ultrasonic transducers 7A and 41B as shown in the figure.

One spacer member 42 of the frame body 4 has a V-shaped cut surface 42A at the portion that comes into contact with the tube to be measured 1, thereby allowing a relatively small diameter cover to be formed as shown in FIG. It is designed so that it can effectively abut against the measuring tubes 1A, 1B and fix the above-mentioned transducers 7A, 7B. The other spacer member 43 (see FIG. 3) is also formed in exactly the same manner. Further, the lower end portions of the frame plates 40 and 41 in FIG. 2, that is, the portions that come into contact with the tube to be measured 1, protrude beyond the end surface 42C of the V-shaped cut surface 42A of the spacer member 42, and Therefore, as shown in FIG. 2, it can effectively abut relatively large tubes 1C and 1D to be measured, and function in exactly the same way as the V-shaped cutting surface 42A described above.

Moreover, the spacer members 42 and 43 of the frame 4
As shown in the figure, a relatively wide cut portion 4 is provided on the opposite end surface of the V-shaped cut surfaces 42A and 43A.
2B, 43B, and the frame body fixing means 5, 6 are disposed in these parts, and as described later, the tube to be measured 1
It is now being installed on Furthermore, the spacer members 42 and 43 have protrusions 42C and 43C extending right and left at right angles at their upper ends in FIG. The frame plates 40 and 41 are mutually connected to the second
As shown in the figure, it can be installed very easily in symmetrical positions, and the entire frame 4 does not bend. 44, 45 indicate mounting screws, and 42D, 4
3D shows the chain guide groove.

Next, the one frame body fixing means 5 includes a chain 50 as a cable member for fixing the frame body 4 to the tube to be measured 1, and a tightening plate 51 that locks both ends of this chain 50. , this tightening plate 51
a threaded portion 52 that applies a predetermined tension (frame fixing force) to the chain 50 by moving it upward in FIG.
a knob portion 53 for rotating the threaded portion 52 as necessary; and a pressing member 54 fixed to the spacer member 42 side of the threaded portion 52 to press the frame body 4 toward the tube to be measured 1. As shown in FIG. 1, this pressing member 54 is disposed in the cutout portion 42B of the spacer member 42 described above. Therefore, the chain 5
0 is disposed in the chain guide groove 42D of the spacer member 42 as shown in FIG. ing. Further, this chain 50 has the above-mentioned knob portion 53
By turning the clamping plate 51, the clamping plate 51 moves up and down, so it is possible to easily apply a constant fixing force. Also, due to the action of the wide cutout 42B formed on the spacer member 42, the pressing member 54
This allows the spacer member 42, that is, the frame 4, to be fixed uniformly to the tube 1 to be measured from the center of the spacer member 42 as shown by arrow A in FIG. Reference numeral 55 indicates a rotation prevention member of the tightening plate 51.

The other frame fixing means 6 is also formed exactly the same as the one frame fixing means 5 described above. 5
6 and 57 (see FIG. 4) indicate a key-shaped member for locking the chain. Therefore, the length of the chain 50 to be used can be freely set depending on the size of the pipe 1 to be measured. Furthermore, the wide cutout portions 42B and 43B formed at the upper ends of the spacer members 42 and 43 in FIG. 1 may be circular counterbore grooves.

As shown in FIG. 3, the one transducer/receiver attachment means 8 moves the transducers 7A, 7B disposed inside the frame 4 toward the pipe under test 1 with a predetermined spring force. A leaf spring member 80 that is constantly pressed, a threaded plate 81 attached to the lower surface of the center of the leaf spring member 80 in FIG. a pressing screw portion 82 for moving the leaf spring member 80 in a direction and applying a predetermined tension to the leaf spring member 80; an operating knob 83 for rotating the pressing screw portion 82 as necessary; and a control knob 83 fixed to the tip of the pressing screw portion 82. and a disc-shaped pressing member 84 (see FIG. 1) that presses the ultrasonic transmitter (or receiver) 7A toward the tube 1 to be measured. The other transducer attachment means 9 is also formed in exactly the same manner.

Among these, the leaf spring member 80 is made of a stainless steel spring material and is bent into a trapezoidal shape as shown in FIG. 40A, 41A, and a rising portion 80B of this U-shaped locking portion 80A in FIG.
Since the connecting portion 80C is generally bent, a spring effect is produced at the connecting portion 80C. Therefore, when the operation knob 83 is rotated clockwise, for example, the screw plate 81 moves upward and pushes up the center portion of the leaf spring member 80, and as a result,
The plate spring member 80 pushes down the screw plate 81 and the pressing screw part 82 downward in the figure by its reaction force, and as a result, the one ultrasonic wave transmitter ( (or wave receiver) 7A is always pressed toward the tube 1 to be measured.

Further, the screw plate 81 of the transducer attachment means 8
, both ends along the leaf spring member 80 are bent slightly upward (see FIG. 3), and the bent ends 81A are locked to the leaf spring member 80 to prevent its rotation. It's suppressed. In this case, the bent end portion 81A may be partially bent at both ends.

Further, the disc-shaped pressing member 84 of the transducer/receiver engaging means 8 is inserted into the counterbore hole 70 formed at the upper end of the one ultrasonic transmitter (or receiver) 7A in FIG. It is starting to be arranged. As a result, the ultrasonic transmitter (or receiver) 7A
is always pressed uniformly from its center toward the center of the tube 1 to be measured, so that the best measurement conditions can always be maintained for a long time. Said other wave transmitting/receiving attachment means 9
are formed in exactly the same way. 79 indicates a counterbore formed in the transmitter (or receiver).

On the upper surface of the frame plates 40 and 41 of the frame body 4,
As shown in the figure, scale plates 4A and 5A are fixed, and correspondingly, vernier scales 4B and 5B are marked on the sides of each of the transmitters (or receivers) 7A and 8A, respectively. This makes it possible to position each of the transmitters (or receivers) 7A, 8A in units of 1/10 [mm]. In this case, each of the vernier scales 4B and 5B attached to the side surfaces of the transmitters (or receivers) 7A and 7B has a relatively long line length, thereby making it possible to Even if the wave transmitters (or wave receivers) 7A, 7B rise or fall due to the diameter of the tube 1 to be measured, they can sufficiently cope with this. 71A and 71B are each a transmitter (or receiver)
The coaxial cable for use is shown.

[Second Embodiment] Next, a second embodiment will be described based on FIG. 5.

In this embodiment, two sets of the above-mentioned frames 4 are provided and connected in a row via a spacer member 44, and one transmitter (or receiver) 7A is installed on one side of the frame 4. and another wave receiver (or wave transmitter) is fixed to the other side of the frame 4. For this reason, in this embodiment, the frame body fixing means 5 described above are provided at a total of three locations as shown in the figure. The configuration and operation of other parts are the same as those of the conventional example described above.

Even in this case, in addition to functioning in the same manner as the first embodiment described above, there is an advantage that flow rate measurement can be performed efficiently especially for the large-diameter pipe 1 to be measured.

In each of the above embodiments, the case where the device is installed at the top of the tube to be measured is illustrated for convenience, but in reality, most of the devices are installed at the side of the tube to be measured 1 to prevent air bubbles and other negative effects. It's summery. The same applies to this embodiment.

〔Effect of the invention〕

As described above, according to the present invention, a block-shaped spacer member is provided at both ends of two opposing frame plates, and a transducer is detachably installed in the center of each frame plate. In the transducer/receiver mounting device for a sonic flowmeter, we have adopted a configuration in which a V-shaped cut surface is formed on the surface of each of the spacer members that comes into contact with the pipe to be measured, so that it can be used for a variety of different diameters over a relatively wide range. It is possible to provide a transducer/receiver mounting device for an ultrasonic flowmeter which is unprecedented and superior in that it is possible to effectively measure the flow rate of a pipe having a size of

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing the first embodiment of the present invention, FIG. 2 is an explanatory view showing the function of the spacer member in the measured tube portion of FIG. 1, and FIG. 3 is a front view of FIG. 1. 4 is a left side view of FIG. 3, and FIG. 5 is a front view showing the second embodiment. 1...Tube to be measured, 7A, 7B...Transducer, 4
0, 41... Frame plate, 42, 43... Spacer member, 42A, 43A... V-shaped cut surface.

Claims (1)

[Claims] 1. An ultrasonic flowmeter having a structure in which block-shaped spacer members are provided at both ends of two opposing frame plates, and a transducer is detachably installed in the center of each frame plate. A transducer mounting device for an ultrasonic flowmeter, characterized in that a V-shaped cutout surface is formed on the surface of each of the spacer members that comes into contact with the pipe to be measured. 2. A transducer mounting device for an ultrasonic flowmeter having a structure in which block-shaped spacer members are provided at both ends of two opposing frame plates, and a transducer is detachably installed in the center of each frame plate. A V-shaped cut surface is formed on the surface of each of the spacer members that comes into contact with the tube to be measured, and the end of each frame plate on the tube to be measured side is connected to the V of each spacer.
A transducer/receiver mounting device for an ultrasonic flowmeter, characterized in that it protrudes beyond a letter-shaped end face.