JP6798396B2 - Water level gauge - Google Patents

Description

The present invention relates to a water level gauge. In particular, the present invention relates to a water level gauge holder provided in a hydraulic water level gauge for measuring water level information in a pipe.

Manholes are provided in the sewer pipes buried underground such as roads as entrances and exits for maintenance such as cleaning and repair. Utilizing the space inside the manhole, we installed a measuring instrument to measure the environment inside the manhole and the quality of the sewage flowing through the pipe, and built an information measurement system inside the pipe to measure the information inside the pipe. (For example, Patent Document 1). For example, as shown in FIG. 7, the measuring instrument 24 is fixed to the bottom of the pipe 27 by a sensor holder 26 provided on the sewage inflow side of the manhole 25.

In the information measurement system in the pipe, for example, in a confluence type sewer, the water level in the manhole pipe becomes high due to the inflow of rainwater into the sewer pipe during rainfall. In addition, fluctuations in water level are greatly affected by rainfall. Therefore, water level measurement is one of the important measurement items in the information measurement system in the pipe.

The water level gauge is classified into a throw-in type such as a water pressure type water level gauge, a non-contact type such as an ultrasonic water level gauge, and a contact type such as a capacitance type water level gauge. In the information measurement system in the pipe, a throw-in type hydraulic water level gauge is often used because it can be easily measured (for example, Patent Document 2).

The water pressure type water level gauge is a detection type water level gauge that utilizes the correlation between the gauge pressure, which is the pressure based on the atmospheric pressure, and the water level (water pressure). The hydraulic water level gauge includes a pressure receiving portion such as a semiconductor pressure conversion element, and the diaphragm at the tip of the pressure receiving portion receives liquid pressure. Then, the liquid pressure is continuously converted into an electric signal by the semiconductor pressure conversion element, and the water level is continuously displayed. The hydraulic water level gauge is connected to the atmosphere using a hollow cable, and the detection error due to the fluctuation of atmospheric pressure is automatically corrected.

When a sensor such as a hydraulic water level gauge is installed in a pipe, the pipe is equipped with a sensor fixture. By fixing the sensor to the pipe with a sensor fixture, the workability is good and the sensor can be fixed so that it does not flow to the downstream side of the pipe.

Japanese Unexamined Patent Publication No. 10-212751 Japanese Unexamined Patent Publication No. 2008-128688 Japanese Patent Application No. 2016-034978

When measuring in a place where there is a flow, the water pressure type water level gauge measures the pressure at which not only the static pressure but also the dynamic pressure acts when the flow hits the pressure receiving part as the liquid pressure, so the dynamic pressure component becomes an error in the water level measurement. ..

In addition, the water pressure type water level gauge has a water guide hole for introducing water into the pressure receiving part inside the water level gauge, but the water guide hole is blocked by the adhesion of dust such as suspended matter in the water to be measured. There is a risk of measurement error.

Due to these problems, when the hydraulic water level gauge is used in a pipe, it can be applied only to an environment where the flow velocity is relatively stable. In an environment where the flow velocity changes greatly, the measurement error of the water pressure type water level gauge may become large, so that there is a case where an ultrasonic water level sensor, which is more expensive than the water pressure type water level gauge, must be used. However, the ultrasonic water level gauge has a problem of measurement error due to rippling on the water surface and a problem of a dead zone, and may be restricted in installation.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique that contributes to the improvement of continuous stable water level measurement.

One aspect of the water level gauge of the present invention that achieves the above object is provided with a pressure receiving portion for detecting water pressure and a water guide hole for introducing water into the pressure receiving portion, and the water level to be measured according to the water pressure detected in the pressure receiving portion. The water level gauge holder is provided with a water level gauge main body for measuring and a water level gauge holder for accommodating the water level gauge main body. The water level gauge holder has a tubular shape with one end open and the other end closed, and the outer cylinder of the water level gauge holder. A holder water passage hole that communicates the inside and outside of the water level gauge holder is formed in the portion, and the holder water passage hole is opened from the water guide hole of the water level gauge main body provided in the water level gauge holder. When the measurement target is flowing, the water level gauge holder is provided on the measurement target so that the open end of the water level gauge holder is on the downstream side. It is a feature.

Further, in another aspect of the water level gauge of the present invention that achieves the above object, in the water level gauge, a notch is formed in the outer cylinder portion of the water level gauge holder from the open end side of the water level gauge holder. The water level gauge body is provided with the water level gauge holder through the notch.

In addition, another aspect of the water level gauge of the present invention that achieves the above object is the water level gauge, wherein the water level gauge is a water pressure type water level gauge that measures water level information of a pipe, and the pipe has a water level gauge. It is characterized in that a sensor fixture for fixing the water level gauge is provided.

In addition, another aspect of the water level gauge of the present invention that achieves the above object is that in the water level gauge, the sensor fixture is formed along the shape of the bottom of the pipe and is provided at the bottom of the pipe. On the bottom plate, a side plate extending upward from each end of the bottom plate, an upper plate erected between the side plates, a sensor fixing portion provided on the bottom plate and fixing the water level gauge, and the upper plate. It is characterized in that it is provided and is provided with an arm that can be inscribed on the wall surface of the pipe.

According to the above invention, stable water level measurement can be continued.

(A) A side perspective view of the water level gauge according to the embodiment of the present invention, and (b) a plan perspective view of the water level gauge according to the embodiment of the present invention. It is a top view of the water level gauge (water level gauge main body) which concerns on embodiment of this invention. It is a perspective view of the sensor fixture which concerns on embodiment of this invention. It is a figure which shows the manhole which the inner wall on the outflow side of an invert has a substantially flat surface. It is a figure which shows the manhole which the inner wall on the outflow side of an invert has a curved surface. (A) A perspective view of another example (main body portion) of the water level gauge holder, (b) a view showing a cut portion of another example of the water level gauge holder, and (c) a side view of another example of the water level gauge holder. It is a figure which shows the state which the measuring instrument is attached in the pipe of the prior art.

The water level gauge according to the embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the water level gauge 1 according to the embodiment of the present invention includes a water level gauge main body 2 and a water level gauge holder 3 for accommodating the water level gauge main body 2.

As shown in FIG. 2, the water level gauge main body 2 is an amplifier that converts the detection signals of the pressure receiving unit 5 (sensor unit) such as a semiconductor pressure conversion element and the pressure receiving unit 5 into a current signal inside the cylindrical body portion 4. A unit 6 is provided. A nose cone 7 is provided at one end of the body portion 4, and a hollow cable 8 extends to the other end of the body portion 4. The nose cone 7 is formed with a water guide hole 9 for introducing water into the pressure receiving portion 5. The hollow cable 8 transmits the current signal converted by the amplifier unit 6 to a signal converter (a converter that converts the output of the pressure unit into the current output of the water level value) or the like. The hollow cable 8 is provided with an air tube 10 for introducing into the atmosphere, and a detection error due to fluctuations in atmospheric pressure is automatically corrected.

As shown in FIG. 1, the water level gauge holder 3 has, for example, a cylindrical shape having an inner diameter larger than the outer shape of the water level gauge main body 2. One end 3a of the water level gauge holder 3 is formed in a streamlined manner, and the height is lowered toward the tip and the width is tapered so as to be narrower. By making the end 3a of the water level gauge holder 3 streamlined or tapered, it becomes difficult for dust to adhere to the water level gauge holder 3, and the water level gauge holder 3 is fixed with the end 3a facing upstream. .. Further, the other end 3b of the water level gauge holder 3 is open so that the water level gauge main body 2 can be taken in and out and the hollow cable 8 can be taken out. The water level gauge holder 3 is formed with a holder water passage hole 3c that communicates the inside and the outside of the water level gauge holder 3, so that water can move inside and outside the water level gauge holder 3. The water level gauge holder 3 (and the water level gauge main body 2) is fixed to the sensor fixing plate 22, which will be described in detail later, and then fixed to the measurement location.

A plurality of holder water passage holes 3c are formed in the outer cylinder portion on the downstream side of the water level gauge holder 3. The holder water passage hole 3c is formed on the downstream side (the end 3b side of the water level gauge holder 3) from the water guide hole 9 of the water level gauge main body 2 provided in the water level gauge holder 3, and is preferably outside the water level gauge holder 3. It is formed in about half of the downstream side of the cylinder. By providing the holder water passage hole 3c on the downstream side avoiding the water guide hole 9 of the water level gauge main body 2, it is possible to prevent the dynamic pressure of the water flow from being directly applied to the pressure receiving surface of the water level gauge main body 2. The distance between the water guide hole 9 of the water level gauge main body 2 and the holder water passage hole 3c was set so that it was not affected by the dynamic pressure due to the change in the flow velocity outside the water level gauge holder 3, or was affected. However, if it is within the permissible error, it is set in consideration of the change in the flow velocity at the installation location.

As described above, the water level gauge 1 according to the embodiment of the present invention has a structure in which the pressure receiving portion 5 such as the water pressure sensor is covered with the water level gauge holder 3, and is used in combination with the sensor fixture 11 as shown in FIG. Will be done. By providing the water level gauge holder 3, the influence of the dynamic pressure generated by the flow of the liquid is reduced, and the measurement failure due to the adhesion of dust or the like is suppressed. The sensor fixture 11 is a manhole such as a manhole in which the inner wall 13 on the outflow side of the invert 12 has a substantially flat surface as shown in FIG. 4 or a manhole in which the inner wall 15 on the outflow side of the invert 14 has a curved surface as shown in FIG. Applies to pipes. The sensor fixture 11 is described in detail in Patent Document 3.

As shown in FIG. 3, the sensor fixture 11 is provided between a bottom plate 17 formed to match the curved surface of the bottom surface of the invert 16 and a side plate 18 extending upward from the end of the bottom plate 17 and the side plates 18. An upper plate 19 erected on the upper plate 19 and an arm fixing portion 20 provided on the upper plate 19 are provided. The bottom plate 17 is provided with a sensor fixing plate 22 extending in the upstream direction of the invert 16. The sensor fixture 11 is made of, for example, corrosion-resistant stainless steel.

The bottom plate 17 is a plate having a width extending from the invert 16 in the manhole to the inside of the downstream side pipeline 21. Therefore, the shape of the bottom plate 17 is formed according to the shape of the bottom surface of the invert 16 and the bottom surface of the downstream side pipeline 21.

The side plate 18 is a plate provided in a state of extending upward from an end portion of the bottom plate 17 on the side wall side of the invert 16, and is a plate connecting the bottom plate 17 and the top plate 19.

The upper plate 19 is provided between the side plates 18. The distance between the upper plate 19 and the bottom of the bottom plate 17 is formed to be longer than the inner diameter of the downstream side pipeline 21, and the positioning bolt (or the arm fixing portion 20) provided on the upper plate 19 or the upper plate 19 (or the arm fixing portion 20) is provided. (Not shown) is pressed against the inner wall surface on the outflow side of the invert 16. The positioning bolt adjusts the position of the sensor fixture 11 in the downstream direction of the invert 16. By forming the width of the upper plate 19 (that is, the distance between the upper ends of the side plates 18) so that the end portion in the width direction of the upper plate 19 does not hit the inner wall of the manhole, the inner wall of the manhole is curved. It can be applied to manhole pipes with.

An arm 23 is provided on the arm fixing portion 20. Further, an arm position adjusting portion (not shown) for adjusting the vertical position of the arm 23 is provided at the upper end portion of the arm 23.

The arm 23 is an L-shaped member, and is provided on the arm fixing portion 20 so as to be movable in the vertical direction. The arm 23 is configured by, for example, bending the lower end portion of a rod extending vertically downward from the arm fixing portion 20 in the downstream direction of the downstream side pipeline 21. For example, a pair of arms 23 are provided so as to be aligned in the radial direction of the invert 16. The arm 23 is fixed by pressing a portion of the downstream side pipeline 21 extending in the downstream direction against the inner peripheral surface of the downstream side pipeline 21 (the curved surface of the upper surface inside the downstream side pipeline 21).

The arm position adjusting unit adjusts the vertical position of the arm 23. The arm position adjusting portion is composed of, for example, a bolt portion formed at the upper end portion of the arm 23 and a nut screwed into the bolt. By moving the arm 23 upward by the arm position adjusting portion, the portion extending in the downstream side pipeline 21 of the arm 23 is pressed against the inner peripheral surface of the downstream side pipeline 21, and the sensor fixture 11 is inverted. It is fixed at 16. Further, by moving the arm 23 downward by the arm position adjusting unit, the sensor fixture 11 can be removed and the position can be adjusted.

A water level gauge 1 (that is, a water level gauge main body 2 and a water level gauge holder 3) is fixed to the sensor fixing plate 22. For example, after attaching the water level gauge main body 2 to the water level gauge holder 3 with a stainless wire or the like using the holder water passage hole 3c of the water level gauge holder 3, the water level gauge holder 3 (and the water level gauge) is attached with a metal binding band or the like. The main body 2) is fixed to the sensor fixing plate 22.

Further, when fixing the water level gauge 1 to the sensor fixing plate 22, as shown in FIG. 6, the bottom of the water level gauge holder 3A is rectangular so as to have a width equal to or smaller than the diameter of the water level gauge main body 2 from the end 3b side. Make a notch 3d and cover it with the water level gauge holder 3A from above the water level gauge main body 2 fixed earlier to the sensor fixing plate 22, or cover the water level gauge holder 3A from the nose cone 7 side of the water level gauge main body 2. May be slid to cover the water level gauge body 2, and then the water level gauge holder 3A may be fixed to the sensor fixing plate 22 with a stainless wire or the like. In this example, the water level gauge holder 3A is configured by providing a cap formed so that the tip is tapered in a cylindrical main body in which the notch 3d is formed. Further, the cap (that is, the inner peripheral portion on the end portion 3a side of the water level gauge holder 3A) is provided with a water level gauge holder positioning protrusion 3e protruding in the end portion 3b direction of the water level gauge holder 3A, and the water level gauge main body. The nose cone 7 of 2 can be brought into contact with the nose cone 7.

As shown in FIG. 3, the water level gauge 1 is installed on the sensor fixing plate 22 with the pressure receiving portion 5 facing upstream. That is, the water level gauge holder 3 is fixed to the sensor fixing plate 22 with the tapered end 3a of the water level gauge holder 3 facing upstream. The approximate dimensions of the water level gauge main body 2 are, for example, φ22 mm × 150 mm.

When the water level gauge 1 is installed in the invert 16, the position of the arm 23 (specifically, the portion extending into the downstream side pipeline 21 of the arm 23) before the sensor fixture 11 is provided in the invert 16. Position) is adjusted so that it is lower than the upper inner peripheral surface of the downstream side pipeline 21. Further, the water level gauge 1 (that is, the water level gauge main body 2 and the water level gauge holder 3) is fixed to the sensor fixing plate 22.

Next, the bottom plate 17 of the sensor fixture 11 is temporarily placed on the invert 16 in the manhole. Then, the sensor fixture 11 is slid in accordance with the invert 16 until the positioning bolt abuts on the wall surface of the manhole, and a part of the bottom plate 17 of the sensor fixture 11 is inserted into the downstream side pipeline 21.

After that, the nut of the arm position adjusting portion is rotated to move the arm 23 upward. By raising the arm 23 until the arm 23 is pressed against the upper inner peripheral surface of the downstream side pipeline 21, the sensor fixture 11 (and the water level gauge 1) is fixed to the invert 16.

According to the water level gauge 1 according to the embodiment of the present invention as described above, in the hydraulic water level gauge, the water level gauge 1 is not affected by the dynamic pressure due to the change in the flow velocity, and the water level gauge 1 is further prevented from being blocked. By doing so, accurate water level measurement becomes possible for a long period of time. That is, by providing the water level gauge holder 3 that protects the water level gauge main body 2, the influence of the dynamic pressure generated by the flow of the liquid is reduced, and the measurement error in the water level measurement is reduced. Then, it becomes possible to continue normal water level measurement with reduced measurement error.

Further, even if dust covers the outer cylinder portion of the water level gauge holder 3, the water guide hole 9 of the water level gauge main body 2 is not blocked. Therefore, at least the holder water passage hole 3c or the rear side of the water level gauge holder 3 As long as the end 3b communicates with external water, normal water level measurement is possible. That is, conventionally, the hydraulic water level gauge requires work to remove deposits by periodic cleaning as a dust countermeasure to prevent the water guide hole from being blocked, and the water level measurement data during the period when the dust is attached to the water guide hole. Could be unreliable. On the other hand, in the water level gauge 1 according to the embodiment of the present invention, since the water guide hole 9 is prevented from being blocked, normal water level measurement can be continued.

Further, by fixing the water level gauge 1 with the sensor fixture 11, the positioning bolt (or the upper plate 19) is in contact with the wall surface inside the manhole, so that the sensor fixture 11 main body flows out of the downstream pipeline 21. It will not be swept in the direction. Further, since the sensor fixture 11 main body provided on the invert 16 does not have a protrusion, it does not hinder the flow even when the sewage flow is strong.

In addition, the sensor fixture 11 (and water level gauge 1) can be easily installed (or removed) by turning the screw and pressing the arm 23 inside the downstream pipeline 21 without damaging the inside of the manhole pipe. And the workability is good. Further, even after the sensor fixture 11 (and the water level gauge 1) is installed, the position of the sensor fixture 11 (and the water level gauge 1) can be easily corrected. As a result, maintenance such as periodic cleaning of the water level gauge 1 becomes easy. By making the water level gauge 1 removable only the water level gauge holder 3, simple maintenance is possible.

Further, if the water level gauge holder positioning protrusion 3e is provided at the end 3a of the water level gauge holder 3 as shown in FIG. 6, the water level gauge holder 3 can be easily positioned.

Although the water level gauge of the present invention has been described above by showing a specific embodiment, the water level gauge of the present invention is not limited to the embodiment, and the design can be appropriately changed as long as the characteristics are not impaired. Yes, the redesigned one also belongs to the technical scope of the present invention.

For example, the sensor fixture for fixing the water level gauge is not limited to the embodiment, and the water level gauge is fixed to a measurement point such as a pipe by a known sensor fixture.

1 ... Water level gauge 2 ... Water level gauge body 3, 3A ... Water level gauge holder 3a, 3b ... End, 3c ... Holder water flow hole 3d ... Notch, 3e ... Water level gauge holder positioning protrusion 4 ... Body, 5 ... Pressure receiving part, 6 ... Amplifier 7 ... Nose cone, 8 ... Hollow cable 9 ... Water guide hole 10 ... Air tube 11 ... Sensor fixtures 12, 14, 16 ... Invert 13, 15 ... Inner wall 17 ... Bottom plate, 18 ... Side plate, 19 ... Top plate 20 ... Arm fixing portion 21 ... Downstream side pipeline 22 ... Sensor fixing plate (sensor fixing portion)
23 ... Arm

Claims (2)

A water level gauge main body that is provided with a pressure receiving unit that detects water pressure and a water guide hole that introduces water into the pressure receiving unit, and measures the water level to be measured according to the water pressure detected by the pressure receiving unit.
A water level gauge holder for storing the water level gauge body is provided.
The water level gauge holder
It has a tubular shape with one end open and the other end closed.
A holder water passage hole that communicates the inside and outside of the water level gauge holder is formed in the outer cylinder portion of the water level gauge holder.
The holder water passage hole is formed on the open end side of the water level gauge holder from the water guide hole of the water level gauge main body provided in the water level gauge holder.
When the measurement target is flowing, the water level gauge holder is provided on the measurement target so that the open end of the water level gauge holder is on the downstream side. A notch is formed in the outer cylinder portion of the water level gauge holder from the open end side of the water level gauge holder, and the water level gauge holder is provided in the water level gauge main body through the notch. The water level gauge according to claim 1.

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