JP3335479B2 - In-pipe type flow meter jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-pipe type flow meter jig which is installed in a pipeline such as a water supply.

[0002]

2. Description of the Related Art A conventional flowmeter for measuring a flow velocity or the like in a pipe buried underground has been installed by winding an ultrasonic sensor around the outer surface of the pipe. However, according to this type of flow meter, the ultrasonic sensor must be buried in the ground like a pipe, and civil engineering work such as excavation of the pipe is required. No, because it is installed outside the pipe, it is affected by the pipe wall,
There has been a problem that accuracy deteriorates and power consumption during measurement increases.

In order to cope with this, it has been proposed to install an ultrasonic sensor in a pipe. That is,
As shown in FIG. 3, a frame 2 is provided which can be inserted into the pipe 1 from a rising portion 1a to which a fire hydrant, an air valve, and the like are attached, and which can be arranged along the pipe axis direction X. The ultrasonic sensor 3 is installed in each. These ultrasonic sensors 3 are configured to be rotatable via a horizontal axis 4 so that they can be adjusted to have optimum sensitivity in response to changes in the inner diameter of the pipeline. And one ultrasonic sensor 3
, The ultrasonic wave a is transmitted into the tube 1, the reflected ultrasonic wave a is received by the other ultrasonic sensor 3, and the signal is sent to the detection unit for analysis, whereby the flow rate of the fluid b in the tube 1 is determined. Can be detected.

According to this in-pipe type flow meter jig, the ultrasonic sensor 3 is installed in the pipe 1 and does not have to pass through the pipe wall with the ultrasonic waves a, so that the measurement accuracy is improved and Low power consumption.

[0005]

However, according to the in-pipe type flow meter jig having the structure shown in FIG. 3, each ultrasonic wave is adjusted so as to have an optimum sensitivity corresponding to a change in the inner diameter of the pipe. The angle of the sensor 3, that is, the output angle and the incident angle must be adjusted, but the adjustment work of these angles is not easy, and it is very troublesome.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and an in-pipe type flowmeter which can easily perform an operation for adjusting an ultrasonic sensor to an optimum sensitivity in response to a change in the inner diameter of a pipe. It is intended to provide a jig.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an in-pipe type flowmeter jig according to the present invention is capable of being inserted into a pipe and is arranged along a pipe axis direction. A pair of ultrasonic sensor portions that are slidably arranged in the direction of the tube axis from the position near the center to both end portions of the body and transmit and receive ultrasonic waves to and from each other; A tubular body rotatably disposed as a pipe shaft connecting the tubular body and the ultrasonic sensor unit, and pulling both ultrasonic sensor units by the rotation of the tubular body to approach or separate from each other; And a cable body that slides in the direction.

[0008]

According to the above arrangement, the position of the ultrasonic sensor can be adjusted by rotating or rotating the cylindrical body by moving the ultrasonic sensor toward or away from each other along the tube axis direction. It can be placed in an appropriate position. In particular, the adjustment range is wider than that in which only one sensor mounting part is adjusted along the pipe axis direction because both ultrasonic sensor parts make the sensor mounting parts approach or separate from each other along the pipe axis direction. .

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a side view and a front view, respectively, showing an in-pipe type flow meter jig according to an embodiment of the present invention.

As shown in FIGS. 1 to 3, the in-pipe type flowmeter jig can be inserted into the pipe 10 and is arranged along the pipe axis direction X and has a rectangular frame 11 in plan view. A pair of ultrasonic sensor sections 12 slidably arranged in the tube axis direction X from a position near the center of the frame body 11 to the vicinity of both ends, and an axis Y extending along the pipe diameter direction at a substantially central portion of the frame body 11. Cylindrical body 1 arranged rotatably about
3 and a folded member 1 provided at both ends of the frame 11
6, a wire 1 as a cable body disposed so as to reciprocally connect the cylindrical body 13 and the ultrasonic sensor unit 12 to each other.
4, 15 are provided. Reference numeral 10a denotes a rising portion to which a fire hydrant, an air valve, and the like are attached, and 13a denotes an operation shaft portion extending above the tubular body 13.

That is, as shown in FIG. 2, four long holes 11a are formed in the frame body 11 from the position near the center to the vicinity of both ends, and the long holes 11a are formed on both sides of the ultrasonic sensor unit 12 from the ultrasonic sensor unit 12. The projected horizontal shaft 17 is fitted, and the ultrasonic sensor unit 12 is slidable in the tube axis direction X by sliding the horizontal shaft 17 along the elongated hole 11a of the frame body 11. The portion fitted into the elongated hole 11a of the horizontal shaft 17 has, for example, a rectangular cross section, and the ultrasonic sensor 12 does not rotate, and always maintains a posture at a predetermined angle.

Each ultrasonic sensor section 12 has a configuration in which one ultrasonic sensor 12b capable of transmitting and receiving ultrasonic waves a is fixed to a sensor fixing member 12a. Also, wire 1
The central portions 4 and 15 are drawn out to the opposite side of the cylindrical body 13 through horizontal through holes 13b and 13c formed in the upper and lower portions of the cylindrical body 13. Then, one end of the wire 14 is folded back by the folding bracket 16 and connected to the outer surface of each ultrasonic sensor unit 12, and the other end of the wire 15 is connected to the inner surface of each ultrasonic sensor unit 12. Directly connected. As a result, by rotating the operation shaft 13a of the cylindrical body 13 in the direction c, the two ultrasonic sensor units 12 move in the direction approaching each other, and the operation shaft 13a of the cylindrical body 13 is moved in the direction d. The rotation causes the two ultrasonic sensor units 12 to move in a direction away from each other.

In the above configuration, by rotating the cylindrical body 13, the two ultrasonic sensor sections 12 are moved in the tube axis direction X.
, The position can be adjusted by approaching or separating from each other, so that the sensitivity adjustment work of the ultrasonic sensor unit 12 can be easily performed, and the work efficiency is improved without much trouble.

Further, since the two ultrasonic sensor units 12 are moved closer to or away from each other in the tube axis direction X, the adjustment range is smaller than that in which only one ultrasonic sensor is adjusted in position along the tube axis direction. Can be made wider, and the range of the pipe diameter of the pipe to be measured can be made wider.

In the above embodiment, the case where one ultrasonic sensor 12b capable of transmission and reception is provided on the sensor fixing member 12a has been described. However, each sensor fixing member has an ultrasonic sensor for transmission and an ultrasonic sensor for reception. A sensor may be provided, and ultrasonic waves may be simultaneously output between the ultrasonic sensor units 12 toward the upstream side and the downstream side to measure the flow velocity. In addition, a chain or the like may be used as a cord other than the wires 14 and 15. Further, only one wire 14 or 15 is provided, and instead of the other wire,
The same operation and effect can be obtained by providing a tension spring or the like for pulling at the center or both ends of the frame.

[0016]

As described above, according to the present invention, by rotating the cylindrical body, the two ultrasonic sensor portions are pulled by the cord and slid in the direction of the tube axis approaching or separating from each other, thereby providing the ultrasonic wave. The positions of the sensor units can be adjusted by approaching or separating from each other along the tube axis direction, and the ultrasonic sensor unit can be easily arranged at an appropriate position.
In particular, the adjustment range is wider than that in which only one sensor mounting part is adjusted along the pipe axis direction because both ultrasonic sensor parts make the sensor mounting parts approach or separate from each other along the pipe axis direction. .

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of an in-tube type flow meter jig according to an embodiment of the present invention.

FIG. 2 is a plan view of the in-tube type flow meter jig.

FIG. 3 is a partially cutaway front view of a conventional in-pipe type flow meter jig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tube 11 Frame 12 Ultrasonic sensor part 13 Cylindrical body 13a Operation shaft part 14, 15 Wire (cord body) 16 Folding bracket a Ultrasonic X Tube axis direction Y Axis line along pipe diameter direction

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-81378 (JP, A) JP-A-63-117266 (JP, A) Fully open 58-1268 (JP, U) Really open 1962 150633 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01F 1/66

Claims (1)

(57) [Claims] 1. A frame which can be inserted into a pipe and is arranged along the pipe axis direction, and which are arranged so as to be slidable in the pipe axis direction from a position near the center of the frame body to both end portions thereof and which are mutually ultrasonic waves. A pair of ultrasonic sensor units for transmitting and receiving, a tubular body disposed at a substantially central portion of the frame body so as to be rotatable about an axis along a pipe radial direction, and the tubular body and the ultrasonic sensor unit And a cable body which pulls the two ultrasonic sensor sections by the rotation of the cylindrical body and slides them in the direction of the tube axis approaching or separating from each other.