JPH0422454B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a transducer mounting device for an ultrasonic flowmeter, and particularly to a device for fixing the transducer/receiver of an ultrasonic flowmeter to the outer surface of a pipe to be measured using a cable member such as a chain. 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, although such conventional examples disclose that the transducer or its entire locking device is attached to the pipe under test using a cable member, in reality, the frame body may be misaligned due to external vibrations, etc. In addition, in the conventional technology in which the mounting strength of the frame body is integrated with the pressing strength against the mounting surface of the ultrasonic transducer, the mounting strength of the frame body is particularly difficult to prevent the propagation of ultrasonic waves. Since this has an important influence, the question of how to attach the frame to the tube to be measured strongly and easily has been raised as an important problem.

The present invention improves the disadvantages of the conventional example, and enables the frame body equipped with the transducer to be firmly fixed to the tube to be measured, and also to avoid positional displacement even in response to external vibrations. The object is to provide a transducer mounting device for a sonic flowmeter.

[Means for solving problems]

Therefore, in the present invention, a frame body for mounting a transducer is formed by two frame plates facing each other and a block-shaped spacer member fixedly attached between both ends of the two frame plates. The frame is equipped at a predetermined location with a transducer locking means for pressing and locking the transducer disposed between the frame plates with a leaf spring member, and the frame is attached to the spacer member. In a transducer mounting device for an ultrasonic flowmeter that is equipped with a cable-like member such as a chain that is wrapped around and fixed to a pipe to be measured at a portion, the frame fixing force adjustment for the frame is attached to each spacer member portion of the frame. A clamping plate that locks both ends of the cable member, and a clamping plate of the spacer member that is equipped with a clamping plate that locks both ends of the cable member, and a clamping plate of the spacer member. A method is adopted in which the structure includes a screw mechanism that applies a moving force in the opposite direction to each of the two. This aims to achieve the above-mentioned purpose.

[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, numeral 1 indicates a pipe to be measured, numeral 2 indicates a fluid such as water (see Fig. 4) flowing inside the pipe to be measured 1, and numeral 3 indicates a wave transmitting/receiving wave of an ultrasonic flowmeter. The device mounting device is shown.

The transducer mounting device 3 includes a frame 4 and a frame 4.
Two sets of frame body fixing means 5 and 6 for fixing both ends of the tube to the tube to be measured 1, and an ultrasonic transducer 7 on the frame body 4.
It is composed of two sets of transducer/receiver attachment means 8, 9 for attaching and fixing the transducers A, 7B.

Among these, the frame body 4 includes a pair of frame plates 4 having an L-shaped cross section.
0, 41, and spacer members 42, 43 fixed to both ends of each frame plate 40, 41 by screws as shown. frame body 40,
41 is a member having an L-shaped cross section, and one protrusion 40A, 41A (see Fig. 4) is arranged so as to protrude toward the outside as shown in the figure, and the other protrusion 40A, 40B is They are equipped opposite each other. A pair of ultrasonic transducers 7A and 7B for transmitting and receiving the waves described above are disposed between the other protrusions 40B and 41B as shown in the figure.

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

Further, the spacer members 42 and 43 of the frame body 4 have a relatively wide cutout portion 42B, as shown in the figure, on the end surface opposite to the V-shaped cutout surfaces 42A and 43A described above.
43B, frame fixing means 5 and 6 are disposed at this portion, and the frame body fixing means 5 and 6 are arranged to be attached to the tube to be measured 1 as described later. Furthermore, spacer members 42, 4
3 has protrusions 42C and 43C extending at right angles from side to side at the upper end in FIG. Due to the perpendicularity to the side surface caused by the protrusion of the protrusions 42C and 43C, the L-shaped frames 40 and 41 can be easily attached to each other in symmetrical positions as shown in FIG. The entire body 4 is designed not to bend. Numerals 44 and 45 indicate mounting screws, and numerals 42D and 43D indicate chain guide grooves.

Next, one frame body fixing means 5 is composed of a chain 50 as a cable member for fixing the frame body 4 to the tube to be measured 1, and a frame body fixing force adjusting means 58 (see FIG. 3). . Of these, the frame body fixing force adjustment means 5
8 is a tightening plate 5 that locks both ends of the chain 50;
1, a threaded portion 52 serving as a threaded mechanism for moving the tightening plate 51 upward in FIG. 3 and applying a predetermined tension (frame body fixing force) to the chain 50; It is configured by a knob portion 53 that rotates, and is fixed to the above-mentioned spacer member 42 side of the threaded portion 52 to move the frame 4 to the pipe to be measured.
A pressing member 54 is attached to press it to the side.

With this pressing member 54 and the above-mentioned cutout portion 42B of the spacer member 42 shown in FIG.
As shown in FIG. 1, a frame locking mechanism 59 is formed. Therefore, the chain 50 is inserted into the chain guide groove 42D of the spacer member 42 as shown in FIG.
Since the chain 50 is disposed in the same direction, the chain 50 is not deviated from its fixation and can be wound at a relatively accurate right angle. Furthermore, in this chain 50, since the clamping plate 51 moves up and down by turning the knob 53, a constant fixing force can be easily applied. 42B, the pressing member 54 always presses against the spacer member 42.
As shown by arrow A in FIG.
It is designed so that it can be fixed to the side. 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. here,
Reference numerals 56 and 57 (see FIG. 4) indicate brat-shaped members 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.

One of the transducer attachment means 8 includes transducers 7A and 7 disposed inside the frame 4 as shown in FIG.
A leaf spring member 80 that constantly presses B toward the pipe to be measured 1 with a predetermined spring force, and a threaded plate 8 attached to the lower surface of the center of the leaf spring member 80 in FIG.
1, and a pressing screw portion 82 that penetrates the center of the screw plate 81 to move the screw plate 81 in the vertical direction in the figure and apply a predetermined tension to the leaf spring member 80.
, an operating knob 83 that rotates this pressing screw part 82 as necessary, and an operating knob 83 that is fixed to the tip of the pressing screw part 82 and presses the ultrasonic transmitter (or receiver) 7A toward the tube 1 to be measured. It is composed of a disc-shaped pressing member 84 (see FIG. 1) that presses the shaft. The other transducer attachment means 9 is formed in exactly the same manner.

Among them, the leaf spring member 80 is made of a stainless steel spring material and is bent into a trapezoidal shape as shown in FIG. , 41A, and the connecting portion 80C of this U-shaped locking portion 80A with the rising portion 80B in FIG. Perhaps because of this, 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 leaf spring member 80 absorbs the reaction force. This causes the screw plate 81 and the pressing screw part 82 to be pushed down in the figure, and as a result, one of the ultrasonic transmitters (or receivers) 7A connects to the tube under test 1 via the disc-shaped pressing member 84. It is now constantly being pushed to the side.

In addition, the threaded plate 81 of the transducer/receiver attachment means 8 has both rough edges bent slightly upwardly on the plate spring member 80 (see FIG. 3), and this bent end 81A It is locked by a spring member 80 and its rotation is suppressed. In this case, the bent end portion 81A
In this case, a portion of both ends may be bent.

Furthermore, the disc-shaped pressing member 8 of the transducer attachment means 8
4 is a counterbore hole 70 formed in the upper end of one ultrasonic transmitter (or receiver) 7A in FIG.
It is designed to be placed inside. As a result, the ultrasonic transmitter (or receiver) 7A is always pressed uniformly from its center toward the center of the tube to be measured 1, and therefore always maintains the best measurement conditions. It has become possible to maintain it continuously for a long period of time. The other wave transmitting/receiving anchoring means 9 is also formed in exactly the same manner. Reference numeral 79 indicates a counterbore formed in the transmitter (or receiver).

As shown in FIG. 1, scale plates 4A and 5A are fixed to the upper surfaces of the frames 40 and 41 of the frame 4.
In addition, correspondingly, each transmitter (or receiver) 7A,
Vernier scales 4B and 5B are marked on the side of 8A, which indicates that each transmitter (or receiver)
7A and 8A can be positioned in 1/10 [mm] units. In this case, the vernier scale 4B attached to the side of the transmitter (or receiver) 7A, 7B,
5B has a relatively long line length, which allows the transmitter (or receiver) 7
Even if A and 7B rise or fall due to the diameter of the tube 1 to be measured, this can be adequately coped with. 71A,
71B indicates a coaxial cable for each transmitter (or receiver).

[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 together via a spacer member 44, and one transmitter (or receiver) 7A is installed on one side of the frame 4. The other side of the frame body 4 is equipped with another wave receiver (or wave transmitter). For this reason, the frame body fixing means 5 described above
However, in this embodiment, as shown in the figure, a total of three locations are provided. 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〕

Since the present invention is configured and functions as described above,
According to this, by the action of the frame fixing force adjustment means, the frame body equipped with the transducer can be strongly attached to the tube under test with arbitrary force, and therefore it has sufficient resistance against external vibrations. It is possible to provide a transducer/receiver mounting device for an ultrasonic flowmeter that is unprecedented and excellent in that it can hold the mounting position of the frame body.

[Brief explanation of drawings]

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, 8
...Transducer/receiver attachment means, 40, 41...Frame plate, 4
2, 43...Spacer member, 50...Chain as cable member, 51...Tightening plate, 52...Thread portion as screw mechanism, 58...Frame body fixing force adjustment means, 59...Frame body member Stopping mechanism, 80...Plate screw member.

Claims (1)

[Scope of Claims] 1. A frame body for mounting a transducer is formed by two frame plates facing each other and a block-shaped spacer member fixedly attached between both ends of the two frame plates. A transducer/receiver locking means for press-locking the transducer disposed between the frame plates with a leaf spring member is provided at a predetermined location of the frame; In the transducer mounting device for an ultrasonic flowmeter, which is equipped with a cable-like member such as a chain that is wrapped around and fixed to a pipe to be measured at its spacer member portion, each spacer member portion of the frame body is provided with a wire for the frame body. A frame fixing force adjusting means is provided, and the frame fixing force adjusting means is provided between a clamping plate that locks both ends of the cable member, and the clamping plate and the spacer member. A transducer/receiver mounting device for an ultrasonic flowmeter, characterized in that the device includes a screw mechanism that applies moving forces in opposite directions to a clamping plate of a spacer member.