JP6038474B2 - Sludge interface measuring device - Google Patents

Description

  The present invention relates to a sludge interface measuring apparatus that is disposed in sewage and measures the distance to the interface of settled sludge.

  In general, in a sedimentation basin such as a water purification plant or a sewage treatment plant, an ultrasonic interface measuring device that is disposed in sewage and has a sensor for measuring an interface position is installed.

  However, when the ultrasonic transmission / reception surface of the ultrasonic interface measuring apparatus is installed in sewage for a long period of time, microorganisms and sludge in the sewage adhere to the transmission / reception surface, thereby preventing transmission / reception of ultrasonic waves. Therefore, since accurate measurement is impossible, it is necessary to periodically clean the transmission / reception surface.

  Conventionally, an ultrasonic measurement device disclosed in Japanese Patent Application Laid-Open No. 2003-302279 is known as a sensor having a structure for cleaning an ultrasonic transmission / reception surface. (Patent Document 1)

  The ultrasonic measurement device is fixedly installed at a predetermined position in a liquid, and includes an ultrasonic transmission / reception device that transmits an ultrasonic pulse toward the sedimented sludge in the liquid and receives the reflected pulse. The ultrasonic transmission / reception device has a bottomed cylindrical sensor holder, and jets cleaning water to the ultrasonic transmission / reception surface from the cleaning water injection port provided on the cylindrical inner surface side of the sensor holder. A transmission / reception surface cleaning means for cleaning the surface is provided.

  However, when the cleaning water is jetted from the cleaning water injection port of the jet outlet to the ultrasonic transmission / reception surface during the measurement, turbulent flow is generated in the vicinity of the ultrasonic transmission / reception surface, and the cleaning water and the contaminated water Are mixed in a complex manner, and a large number of boundary surfaces between cleaning water and contaminated water having different densities are formed, and thus the transmitted ultrasonic waves are scattered by being refracted in all directions at the above-mentioned many boundary surfaces, There was a problem that accurate measurement was not possible.

Further, the gas dissolved in the cleaning water becomes bubbles and adheres to the ultrasonic wave transmission / reception surface, which prevents the ultrasonic wave transmission / reception and hinders accurate measurement.
JP 2003-302279 A

  Then, the subject of this invention is providing the sludge interface measuring apparatus which can prevent that a sludge adheres to a sensor part and can perform an accurate measurement continuously.

In order to solve the above-mentioned problem, in the sludge interface measuring device according to the invention of claim 1, the sludge interface measuring device is disposed in the sewage of the sedimentation basin and has a sensor unit for measuring the sludge interface of the sedimentation basin. And having a vortex forming part capable of forming a vortex flow caused by fresh water below the sensor part, wherein the sensor part is constituted by an ultrasonic signal transmitting / receiving device and is formed in a substantially cylindrical shape as a whole. The eddy current forming unit is disposed between the peripheral surface portion covering portion that covers the peripheral surface portion of the sensor portion, and between the peripheral surface portion covering portion and the peripheral surface portion of the sensor portion, and the supplied fresh water is disposed below the sensor portion. And a guide portion arranged in a spiral shape along the height direction.

Therefore, since the eddy current is formed below the sensor part by the eddy current forming part, the sewage is stirred and the turbulent flow in which the fresh water and the sewage are mixed is not generated, and the sensor part and the above Fresh water can always be interposed between the sewage and the fresh water and sewage can be arranged in layers below the sensor unit.
Furthermore, the supplied fresh water spirally flows along the guide portion between the peripheral surface portion covering portion and the peripheral surface portion of the sensor portion, and then forms a vortex below the sensor portion due to inertia. .

In the sludge interface measuring apparatus according to the invention of claim 2, the eddy current forming part further includes a lower covering part covering the lower part of the sensor part.

  Therefore, since the eddy current forming portion further includes the lower covering portion that covers the lower portion of the sensor portion, it is possible to prevent the eddy current caused by the fresh water formed below the sensor portion from being diffused in the radial direction and disappearing. A swirl due to fresh water can be reliably formed below the sensor unit.

In the sludge interface measuring apparatus according to the invention of claim 3, the lower covering portion is formed in a tapered shape that converges as it goes downward.

  Therefore, since the lower covering portion is formed in a tapered shape that converges as it goes downward, the vortex formed below the sensor portion is caused to flow inside the lower covering portion formed in a tapered shape. It can be made to flow downward spirally while gradually reducing the diameter.

In the sludge interface measuring apparatus according to the invention of claim 4 , the upper end portion of the peripheral surface covering portion is provided with a fresh water supply portion and a hole capable of discharging the generated bubbles. .

  Therefore, since fresh water is supplied from the upper end part of the said peripheral surface part coating | coated part, the flow distance and flow time until the supplied fresh water reaches the downward direction of the said sensor part become long. Further, bubbles generated by the air dissolved in the fresh water can be discharged from the hole.

The sludge interface measuring device according to the invention of claim 5 is a sludge interface measuring device that is disposed in the sewage of the sedimentation basin and has a sensor unit that measures the sludge interface of the sedimentation basin, below the sensor unit. The sensor part is formed in a short cylindrical shape, and the eddy current formation part is disposed at a lower part of the sensor part. A lower covering portion covering the lower portion, and a fresh water supply portion disposed so as to form a vortex by discharging fresh water toward the inside of the lower surface portion of the sensor portion, It is formed in the taper shape which converges as it goes to.

  Therefore, the eddy current by fresh water can be formed below the sensor unit by discharging the fresh water from the fresh water supply unit toward the inside of the lower surface of the sensor unit.

  Further, the eddy current forming part is disposed below the sensor part and has a lower covering part that covers the lower part of the sensor part, so that the fresh water is supplied from the fresh water supply part toward the inside of the lower surface part of the sensor part. By discharging, it is possible to prevent the eddy current caused by the fresh water formed below the sensor part from being diffused in the radial direction and disappearing, and the eddy current caused by the fresh water can be reliably formed below the sensor part.

Further, since the lower covering portion is formed in a tapered shape that converges as it goes downward, the vortex formed below the sensor portion is caused to flow inside the lower covering portion formed in a tapered shape. It can be made to flow downward spirally while gradually reducing the diameter.

The sludge interface measuring apparatus according to the invention of claim 6 is characterized in that a plurality of the fresh water supply sections are provided along the tangential direction of the lower surface of the sensor section.

  Therefore, since the said fresh water supply part is provided with two or more along the tangent direction of the lower surface part of a sensor part, fresh water can be discharge | released along the tangential direction of the lower surface part of the said sensor part from several places.

In the sludge interface measuring apparatus according to the invention of claim 7, the sensor section is constituted by a laser distance meter, and has a pulse light transmitting section, a reference light receiving section, and a distance measuring light receiving section. It is characterized in that the distance from the sludge interface is measured by detecting the phase difference with the distance light.

  Therefore, even when the sensor unit is a laser distance meter, a vortex can be formed between the sensor unit and sewage.

In the sludge interface measuring apparatus according to the inventions of claims 1 and 5 , the sewage is not stirred to produce a turbulent flow in which fresh water and sewage are mixed, and between the sensor unit and the sewage. Since fresh water can always be interposed, and fresh water and sewage can be arranged in layers below the sensor section, the boundary surface between the fresh water and sewage is formed horizontally, and the wave can be moved straight without being refracted. As a result, accurate measurement can be performed.

  Further, fresh water and sewage are arranged in layers below the sensor unit, and sewage does not come into contact with the sensor unit, so that sludge does not adhere to the sensor unit.

  Therefore, it is possible to prevent the sludge from adhering to the sensor unit, and it is possible to continuously perform accurate measurement.

Moreover, in the sludge interface measuring apparatus according to the invention of claim 1 , since the supplied fresh water spirally flows down the guide part, it forms a vortex below the sensor part due to inertia. Unlike the case of injecting fresh water, it is possible to form a vortex with a slow flow rate due to fresh water.

  Therefore, since the flow velocity of the vortex caused by fresh water is slow, the turbulent flow caused by the vortex caused by the fresh water can be reliably prevented from agitating the sewage at the boundary surface between the fresh water and the sewage. It can be done reliably.

In the sludge interface measuring apparatus according to the invention of claim 2 , it is possible to prevent the eddy current caused by the fresh water formed below the sensor part from diffusing in the radial direction and disappearing, and the eddy current caused by the fresh water is provided below the sensor part. Since it can form reliably, the contact with the said sensor part and dirty water is prevented reliably.

  Therefore, it is possible to reliably prevent the sludge from adhering to the sensor unit, and it is possible to continuously perform accurate measurement reliably.

In the sludge interface measuring apparatus according to the invention of claim 3 , the vortex formed below the sensor part is spirally formed while the diameter is gradually reduced inside the lower covering part formed in a tapered shape. Since fresh water is always present inside the lower covering portion, the fresh water can be more reliably interposed between the sensor portion and the sewage.

  Therefore, it is possible to more reliably prevent the contact between the sewage and the sensor unit, and as a result, it is possible to more reliably prevent the sludge from adhering to the sensor unit, and to continue accurate measurement. It can be done reliably.

In the sludge interface measuring apparatus according to the invention of claim 4 , since the flow distance and flow time until the supplied fresh water reaches the lower part of the sensor part become longer, the fresh water reaches the lower part of the sensor part. The dissolved air can be separated, and the generated bubbles can be released from the hole.

  Therefore, there is no possibility that measurement is hindered by bubbles adhering to the sensor unit, and as a result, more reliable measurement can be performed.

In the sludge interface measuring apparatus according to the invention of claim 5, the eddy current caused by the fresh water formed below the sensor unit is discharged in the radial direction by discharging the fresh water from the fresh water supply unit toward the inside of the lower surface of the sensor unit. The eddy current caused by fresh water can be surely formed under the sensor part, and the fresh water always exists in the lower covering part. It is possible to interpose fresh water more reliably between the two.

  Therefore, it is possible to more reliably prevent the contact between the sewage and the sensor unit, and as a result, it is possible to more reliably prevent the sludge from adhering to the sensor unit, and to continue accurate measurement. It can be done reliably.

Further, in the sludge interface measuring apparatus according to the invention of claim 5 , the vortex formed below the sensor part is gradually reduced in diameter inside the lower covering part formed in a tapered shape. Since it can flow downward in a spiral shape, fresh water is always present inside the lower covering portion, so that the fresh water can be more reliably interposed between the sensor portion and the sewage.

  Therefore, it is possible to more reliably prevent the contact between the sewage and the sensor unit, and as a result, it is possible to more reliably prevent the sludge from adhering to the sensor unit, and to continue accurate measurement. It can be done reliably.

In the sludge interface measuring apparatus according to the sixth aspect of the present invention, fresh water can be discharged from a plurality of locations along the tangential direction of the lower surface portion of the sensor unit, so that a vortex can be reliably formed.

  Therefore, it is possible to reliably prevent the sludge from adhering to the sensor unit, and it is possible to continuously perform accurate measurement reliably.

In the sludge interface measuring apparatus according to the invention of claim 7 , even if the sensor unit is a laser distance meter, a vortex can be formed between the sensor unit and the sewage, Fresh water can be interposed between the sensor unit and the sewage, and as a result, even when the sensor unit is a laser distance meter, it is possible to prevent the sludge from adhering to the sensor unit, Accurate measurement can be performed continuously.

It is a perspective view which shows the sludge interface measuring device in 1st Embodiment of the sludge interface measuring device which concerns on this invention. It is a longitudinal cross-sectional view of the sludge interface measuring device in 1st Embodiment of the sludge interface measuring device which concerns on this invention. It is a perspective view which shows the sludge interface measuring apparatus in 2nd Embodiment of the sludge interface measuring apparatus which concerns on this invention. It is a longitudinal cross-sectional view of the sludge interface measuring apparatus in 2nd Embodiment of the sludge interface measuring apparatus which concerns on this invention. It is the sectional view on the AA line in FIG. 3 of the sludge interface measuring apparatus in 2nd Embodiment of the sludge interface measuring apparatus which concerns on this invention.

  Hereinafter, the present invention will be described in detail based on a first embodiment shown in the accompanying drawings.

  As shown in FIG. 1, the sludge interface measuring apparatus 10 according to the first embodiment includes a sensor unit 11 that is disposed in the sewage of a sedimentation basin and measures the sludge interface of the sedimentation basin. Is provided with a vortex forming portion 12 that can form a vortex flow caused by fresh water below the sensor portion 11.

  As shown in FIG. 1, the sensor unit 11 is formed in a substantially cylindrical shape as a whole. As shown in FIG. 2, the sensor unit 11 includes an ultrasonic signal transmitting / receiving device 13. An ultrasonic transmission / reception unit 23 capable of transmitting / receiving ultrasonic signals is disposed.

  As shown in FIGS. 1 and 2, the eddy current forming portion 12 includes a peripheral surface portion covering portion 15 that covers the peripheral surface portion 16 of the sensor portion 11, and the peripheral surface portion covering portion 15 and the periphery of the sensor portion 11. Covering the lower part of the sensor part 11 and the guide part 17 arranged between the surface part 16 and spirally arranged along the height direction to allow the supplied fresh water to flow downward to the sensor part 11. The lower covering portion 18 is formed in a tapered shape that converges as it goes downward.

  The peripheral surface portion covering portion 15, the lower covering portion 18, and the guide portion 17 are integrally formed of a synthetic resin material, and are configured to be detachable from the sensor portion 11.

  As shown in FIGS. 1 and 2, a fresh water supply unit 20 is provided at the upper end 19 of the peripheral surface covering portion 15, and a hose 21 connected to the eddy current forming unit 12 is connected to the fresh water supply unit 20. The tap water is supplied from outside as fresh water.

  Further, a hole 21 through which bubbles can be discharged is formed in the upper end portion 19 of the peripheral surface covering portion 15, and the upper surface portion 25 of the sensor portion 11 is connected to an external converter (not shown). A cable 26 that can transmit and receive signals between the sludge interface measuring apparatus 10 and the converter is connected.

  Hereinafter, the operation of the sludge interface measuring apparatus 10 according to the present embodiment will be described.

  As shown in FIG. 2, in the sludge interface measuring apparatus 10, since the eddy current is formed below the sensor unit 11 by the eddy current forming unit 12, the sewage is agitated and the fresh water and the sewage are mixed. Since turbulent flow is not generated, fresh water can always be interposed between the sensor unit 11 and the sewage, and since fresh water and sewage can be arranged in layers below the sensor unit 11, The boundary surface with the sewage is formed horizontally, and the ultrasonic signal can be moved straight without being refracted. As a result, accurate measurement can be performed.

  In addition, fresh water and sewage are arranged in layers below the sensor unit 11, and sewage does not contact the sensor unit, so that sludge does not adhere to the bottom surface part 22 of the sensor unit 11. .

  Therefore, the sewage does not come into contact with the bottom surface portion 22 of the sensor unit 11, and as a result, it is possible to prevent the sludge from adhering to the bottom surface portion 22 of the sensor unit 11, and to continue accurate measurement. It can be carried out.

  The supplied fresh water flows down spirally along the guide portion 17 between the peripheral surface portion covering portion 15 and the peripheral surface portion 16 of the sensor portion 11, and then lowers the sensor portion 11 due to inertia. Since a vortex is formed, unlike a case where fresh water is jetted from a nozzle, a vortex having a slow flow rate due to the fresh water can be formed.

  Therefore, since the flow velocity of the vortex caused by fresh water is slow, the turbulent flow caused by the vortex caused by the fresh water can be reliably prevented from agitating the sewage at the boundary surface between the fresh water and the sewage. It can be done reliably.

  As shown in FIGS. 1 and 2, the eddy current forming part 12 further includes the lower covering part 18 that covers the lower part of the sensor part 11, so that the eddy current caused by the fresh water formed below the sensor part 11 is generated. It can be prevented from diffusing and disappearing in the radial direction, and a swirl of fresh water can be reliably formed below the sensor unit 11.

  Therefore, the contact between the bottom surface portion 22 of the sensor unit 11 and the sewage is reliably prevented, and as a result, it is possible to reliably prevent the sludge from adhering to the bottom surface portion 22 of the sensor unit 11 and continuously. Accurate measurement can be performed reliably.

  As shown in FIGS. 1 and 2, since the lower covering portion 18 is formed in a tapered shape that converges as it goes downward, the vortex formed below the sensor portion is tapered. It is possible to flow downward in a spiral manner while gradually reducing the diameter inside the formed lower covering portion.

  Therefore, since fresh water is always present inside the lower covering portion, the fresh water can be more reliably interposed between the sensor portion and the sewage. Contact can be prevented, and as a result, it is possible to more reliably prevent sludge from adhering to the sensor part, and it is possible to continuously perform accurate measurement more reliably.

  As shown in FIG. 1 and FIG. 2, since fresh water is supplied from the upper end portion 19 of the peripheral surface covering portion 15, the flow distance and flow time until the supplied fresh water reaches below the sensor portion 11. Since it becomes long, it can isolate | separate the air which the fresh water melt | dissolved by the bottom of the said sensor part.

  Further, bubbles generated by the air dissolved in the clear water can be discharged from the hole portion 21.

  Therefore, there is no possibility that measurement is hindered by bubbles adhering to the bottom surface portion 22 of the sensor unit 11, and as a result, more reliable measurement can be performed.

  Hereinafter, the present invention will be described in detail based on a second embodiment shown in the accompanying drawings.

  In addition, the same code | symbol is attached | subjected to the structure same as the sludge interface measuring apparatus 10 which concerns on the said 1st Embodiment, and description is abbreviate | omitted.

  As shown in FIG. 3, in the sludge interface measuring apparatus 30 according to the first embodiment, the sensor unit 31 is formed in a short cylindrical shape, and the eddy current forming unit 32 includes the sensor unit 31. The lower covering portion 18 is disposed at the lower portion and covers the lower portion of the sensor portion 31, and the lower portion 33 of the sensor portion 31 is disposed toward the inner side of the lower surface portion 33 so that eddy current can be formed. And a fresh water supply unit 34.

  Further, as shown in FIGS. 3 and 4, the lower covering portion 18 is formed in a tapered shape that converges as it goes downward.

  As shown in FIGS. 4 and 5, the fresh water supply portion 34 is formed on the lower surface portion 33 of the sensor 31, and the lower surface portion of the sensor portion 31 is in a ring-shaped guide portion 39 connected to the hose 24. A plurality of fresh water introduced from the hose 24 into the guide portion 39 from the plurality of fresh water supply portions 34 along the tangential direction of the lower surface portion 33 of the sensor portion 31. A vortex is formed by discharging the sensor unit 31 below the sensor unit 31.

  As shown in FIG. 4, the sensor unit 31 includes an ultrasonic transmission / reception device 13, and the ultrasonic transmission / reception unit 23 is disposed on the lower surface portion 33.

  Further, as shown in FIGS. 3 and 4, the upper surface portion 25 of the sensor unit 31 is connected to an external converter (not shown), and a signal is transmitted between the sludge interface measuring device 10 and the converter. Is connected.

  Hereinafter, the operation of the sludge interface measuring apparatus 30 according to the second embodiment will be described.

  In addition, description is abbreviate | omitted regarding the part which is the same structure as the sludge interface measuring apparatus 10 which concerns on the said 1st form.

  As shown in FIG. 5, the sludge interface measuring device 30 is formed below the sensor unit by discharging fresh water from the fresh water supply unit 34 toward the inside of the lower surface 33 of the sensor unit 31. Since it is possible to prevent the eddy current caused by the fresh water from diffusing and disappearing in the radial direction, and the eddy current caused by the fresh water can be reliably formed below the sensor portion 31, the fresh water always exists inside the lower covering portion 18. Thus, fresh water can be more reliably interposed between the sensor unit 31 and the sewage.

  Accordingly, contact between the sewage and the sensor unit can be reliably prevented, and as a result, it is possible to reliably prevent the sludge from adhering to the sensor unit 31 and to ensure accurate measurement continuously. It can be carried out.

  As shown in FIGS. 4 and 5, a plurality of the fresh water supply portions 34 are provided along the tangential direction of the lower surface portion 33 of the sensor portion 31, so that the tangential direction of the lower surface portion of the sensor portion from a plurality of locations. It is possible to discharge fresh water along

  Therefore, since a vortex can be reliably formed, it is possible to reliably prevent the sludge from adhering to the sensor unit, and as a result, it is possible to continuously and accurately perform accurate measurement.

  In the first and second embodiments, the sensor units 11 and 31 are configured by the ultrasonic transmission / reception device 13. However, the sensor units 11 and 31 include a pulse light transmission unit, a reference light reception unit, and a distance measurement light reception unit. It can also be configured by a laser rangefinder that measures the distance from the sludge interface by detecting the phase difference between the light and the ranging light.

  In addition, by configuring the sensor units 11 and 31 with a laser distance meter, it is possible to obtain higher accuracy than the ultrasonic transmission / reception device 13 and to reduce the size of the sensor units 11 and 31.

  The present invention is applicable to a sludge interface measuring device arranged in sewage.

DESCRIPTION OF SYMBOLS 10 Sludge interface measuring device 11 Sensor part 12 Eddy current formation part 13 Ultrasonic transmission / reception apparatus 15 Peripheral surface part coating | coated part 16 Peripheral surface part 17 Guide part 18 Lower coating | coated part 19 Upper end part 20 Fresh water supply part 21 Hole part 22 Bottom face part 23 Ultrasonic transmission / reception part 24 hose 25 upper surface portion 26 cable 30 sludge interface measuring device 31 sensor portion 32 eddy current forming portion 33 lower surface portion 34 fresh water supply portion 35 laser distance meter 36 pulse light transmitting portion 37 reference light receiving portion 38 distance measuring light receiving portion 39 guide portion

Claims (7)

A sludge interface measuring device that is disposed in the sewage of a sedimentation basin and has a sensor unit that measures the sludge interface of the sedimentation basin, and has a eddy current formation unit that can form a vortex flow caused by fresh water below the sensor unit. ,
The sensor unit is constituted by an ultrasonic signal transmitting / receiving device, and is formed in a substantially cylindrical shape as a whole, and the eddy current forming unit includes a peripheral surface portion covering portion that covers the peripheral surface portion of the sensor portion,
A guide portion disposed between the peripheral surface portion covering portion and the peripheral surface portion of the sensor unit, and capable of causing the supplied fresh water to flow downward below the sensor unit, and spirally disposed along the height direction. And a sludge interface measuring device . The circulation forming center is the sludge interface measurement apparatus according to claim 1, further comprising a lower cover unit for covering the lower side of the sensor unit. 3. The sludge interface measuring apparatus according to claim 2 , wherein the lower covering portion is formed in a tapered shape that converges toward the lower portion. The sludge interface measurement according to any one of claims 1 to 3 , wherein an upper end portion of the peripheral surface covering portion is provided with a fresh water supply portion and a hole portion through which the generated bubbles can be discharged. apparatus. A sludge interface measuring device that is disposed in the sewage of a sedimentation basin and has a sensor unit that measures the sludge interface of the sedimentation basin, and has a eddy current formation unit that can form a vortex flow caused by fresh water below the sensor unit. ,
The sensor unit is formed in a short cylindrical shape, and the eddy current forming unit is disposed at a lower part of the sensor unit, and is provided in a lower covering unit that covers a lower part of the sensor unit and an inner surface of the lower surface of the sensor unit. A fresh water supply section arranged so that a vortex can be formed by discharging fresh water toward the
The sludge interface measuring device, wherein the lower covering portion is formed in a tapered shape that converges as it goes downward. 6. The sludge interface measuring apparatus according to claim 5, wherein a plurality of the fresh water supply units are provided along a tangential direction of a lower surface portion of the sensor unit. The sensor unit is composed of a laser distance meter, and has a pulsed light transmitting unit, a reference light receiving unit, and a ranging light receiving unit, and detects the phase difference between the reference light and the ranging light to detect the distance from the sludge interface. The sludge interface measuring device according to claim 5, wherein