JPH095143A - Transmitting/receiving apparatus for measuring interface of suspended foreign matter - Google Patents

Abstract

PURPOSE: To always enable stable and accurate measurement of the position of an interface by wiping a transmitting/receiving surface with a fur-like rotary member with the diameter thereof equal to or more than that of the transmitting/receiving surface. CONSTITUTION: A rotary member 5 with the diameter D1 of rotation thereof equal to or larger than the diameter D of a transmitting/receiving surface 3a of the body 3 of a transmitting/receiving device is mounted at the tip part of a support arm 11 connected to a nozzle 14 so that a rotating shaft is orthogonal to the transmitting/ receiving surface 3a and numerous fur-like members 8 are planted on the member 5 as member for removing matters adhering thereto. When a valve 13 comprising a solenoid valve is opened or closed automatically by a contact signal from the body 3, a fluid for jetting pressurized 12 is jetted in the direction of the arrow C from the nozzle 14 via the valve 13 to turn the member 5 and the transmitting/receiving surface 3a is wiped out with the fur-like members 8. This enables removal of sludge or the like even when it adheres to any part of the transmitting/receiving surface 3a to maintain the level of a received signal at a proper value thereby always achieving stable and accurate measurement of the position of an interface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention emits ultrasonic waves toward the interface of precipitates in a settling tank for wastewater treatment, sewage treatment, etc. and other foreign matter suspended in a liquid to measure the position of the interface. The transmitter / receiver for doing.

[0002]

2. Description of the Related Art FIG. 5 shows an outline of a conventional interface measuring apparatus equipped with this type of transducer. This interface measuring device is disclosed in Japanese Patent Application Laid-Open No. 1-304322.

In FIG. 5, the settling tank 101 is set so that the volume thereof is commensurate with the amount of liquid such as waste water and sewage to be treated, the bottom is formed in a funnel shape, and the pulling pump 102 is provided at the center of the bottom. A continuous suction port is opened, and a discharge pipe 103 for discharging the supernatant is connected to the upper part.

The wave transmitter / receiver 105 is arranged so that the lower half of the wave is immersed in the liquid 106 in the settling tank 101 (may be completely submerged in the liquid), for example, 400 to 1500.
(KHz) ultrasonic waves are transmitted downward. And
Various reflected waves including reflected waves reflected by the interface 109 between the sludge 108 and the liquid 106, which are sediments, are received and the received signal is transmitted to the measuring device 110.

The measuring device 110 discriminates the signal related to the interface from the received signal, measures the time from the transmission to the reception, the degree of attenuation, etc., and based on these measured values, the interface 109.
Is calculated.

In the above-mentioned interface measuring device, when sludge or the like adheres to the wave receiving / transmitting surface of the wave transmitter / receiver 105, as shown by the solid line A in FIG. However, there is a problem that the received signal level (sensitivity) is lower than that of the above. In such a case, it is easy to misidentify the bottom surface of the tank as the interface instead of the original position of the interface, and even a received signal cannot be obtained, resulting in an unmeasurable state. This phenomenon becomes more prominent because the higher the frequency used for measurement, the smaller the amplitude and the less energy.

Therefore, in order to solve this problem, FIG.
The transmitter / receiver 112 shown in FIG. This transducer 11
No. 2 is disclosed in Japanese Utility Model Laid-Open No. 5-64715.

As shown in the figure, in the transmitter / receiver 112, a dome-shaped member made of synthetic resin or the like, which is capable of sufficiently transmitting ultrasonic waves, is formed on a transmitting / receiving surface 113a of a transmitter / receiver main body 113 for transmitting and receiving ultrasonic waves. 115 is covered. Then, in the chamber formed by the wave transmitter / receiver main body 113 and the dome-shaped member 115, the sound wave transmission medium 11 having the same physical property as the liquid 106 as the interface position measurement target.
6 is filled. Pure water is used as the sound wave transmitting medium 116, for example.

On the other hand, a pipe 119 is provided so as to cover the connection cable 118 connected to the transmitter / receiver main body 113, and a guide tube 120 for guiding water as a cleaning fluid is inserted into the pipe 119. Has been done.

The cleaning water is stored in a storage tank (not shown), pressurized by the pressure pump 122, and supplied through the valve 123.

The guide tube 120 is bent at its tip and in the vicinity thereof, and a pipe 119 is passed through a packing 125.
Of the dome-shaped member 115, and is directed toward the tip of the dome-shaped member 115. A nozzle 127 is attached to the tip of the guide tube 120, and cleaning water is sprayed from the nozzle 127.

In the above-mentioned wave transmitter / receiver 112, the flat wave transmitting / receiving surface 113a of the wave transmitter / receiver main body 113 is covered with the curved dome-shaped member 115. That is, the action of the curved surface prevents sludge and gas bubbles 129 generated from the sludge from adhering easily.

Further, by spraying water from the nozzle 127 onto the dome surface which is a substantial wave transmitting / receiving surface, further removal and prevention of adhered substances are achieved.

[0014]

However, in the wave transmitter / receiver 112 having the above-mentioned structure, the pressurized water jetted from the nozzle 127 is concentrated on the tip portion of the dome-shaped member 115, that is, the center portion of the wave transmitting / receiving surface. Sludge and other substances that may reduce sensitivity may adhere to the periphery,
Once adhered to the periphery, it easily spreads to the center.

Further, in the wave transmitter / receiver 112 having the above structure, since the wave transmitting / receiving surface is spherical by providing the dome-shaped member 115, the directivity of ultrasonic waves is sharp, and the wave transmitter / receiver 112 at the time of mounting the wave transmitter / receiver 112 is attached. There is concern that the received signal level may be attenuated due to an angle shift or the like.

The present invention has been made in view of the above-mentioned points, and its main purpose is to provide a transducer that can always and stably measure the interface position. It is also an object of the present invention to provide a wave transmitter / receiver that can also exhibit other effects.

[0017]

In order to achieve the above-mentioned object, a wave transmitter / receiver according to the present invention has a wave transmitter / receiver main body having a wave transmitting / receiving surface for transmitting and receiving ultrasonic waves, and wiping off deposits adhering to the wave transmitting / receiving surface. The wiping means is configured to wipe substantially the entire wave transmitting / receiving surface.

[0018]

In the above-mentioned wave transmitter / receiver, substantially the entire wave transmitting / receiving surface of the wave transmitter / receiver body is wiped.

[0019]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 to 4 show a transducer for measuring the interface of suspended foreign matter and an interface measuring apparatus equipped with the same as an embodiment of the present invention.

As shown in FIGS. 3 and 4, the wave transmitter / receiver 1 according to the present invention includes a wave transmitter / receiver body 3 having a wave transmitting / receiving surface 3a for transmitting an ultrasonic wave and receiving a reflected wave thereof, and a rotating member. And a wiping means for wiping off deposits such as sludge attached to the wave transmitting / receiving surface 3a. As shown in the figure, the wave transmitting / receiving surface 3a of the wave transmitter / receiver main body 3 is circular and is flat.

A pipe 9 is provided so as to cover the connection cable 7 connected to the transmitter / receiver main body 3, and a guide tube 10 for guiding the injection fluid is inserted into the pipe 9. However, the connection cable 7 is connected to the transmitter / receiver main body 3
A power transmission line for supplying electric power for activating the power transmission and a transmission line for transmitting a reception signal generated by the transmitter / receiver main body 3 are incorporated.

As the jetting fluid, for example, water is used, and this water is stored in a storage tank (not shown),
It is pressurized by the pressure pump 12 and supplied through the valve 13.

The guide tube 10 has a tip end portion and its vicinity bent to be exposed to the outside of the pipe 9 through a packing 15, and a nozzle 14 is attached to the tip end.

As is apparent from FIG. 4, this nozzle 14
Are directed to the outer part of the rotary member 5. The rotating member 5
Is formed in a blade shape and has, for example, three blade portions, and the pressurized water jetted from the nozzle 14 is rotated by urging each blade portion as shown by an arrow C.

The nozzle 14 and the pipe 9 described above,
The guide tube 10, the pressurizing pump 12, the valve 13, and the packing 15 constitute a fluid ejecting means, and the fluid ejecting means acts as a drive means for rotationally driving the rotating member 5 as described above.

More specifically, the rotating member 5 has a rotation diameter D larger than the diameter D of the wave transmitting / receiving surface 3a of the wave transmitter / receiver body 3.
₁ , the rotation axis of which is orthogonal to the wave transmission / reception surface 3a, and is rotatably attached to the tip of the support arm 11 coupled to the nozzle 14. However, the rotation diameter D ₁ of the rotating member 5 may be set to be equal to or slightly smaller than the diameter D of the wave transmitting / receiving surface 3a.

As shown in the figure, innumerable hair-like members 8 as adhering matter removing members are planted in the rotating member 5, and the hair-like members 8 are rotated as the rotating member 5 rotates. Three
It is supposed to wipe the wave transmitting / receiving surface 3a.

According to the above structure, the wave transmitting / receiving surface 3a is wiped almost entirely.

The wave transmitting / receiving of the wave transmitter / receiver main body 3 is performed by the rotating member 5, the hair-like member 8 as the adhering matter removing member, and the fluid ejecting means (described above) as the driving means for rotationally driving the rotating member 5. A wiping means for wiping off adhered matter such as sludge attached to the wave surface 3a is configured.

Here, the transducer main body 3 is composed of one vibrator, and this vibrator can transmit and receive ultrasonic waves of two or more different frequencies. This takes advantage of the characteristics of the oscillator. For example, the basic 3
By using a vibrator that oscillates ultrasonic waves having a frequency (fundamental frequency) of 50 (KHz), it is possible to simultaneously transmit and receive ultrasonic waves having a frequency of 1050 (KHz), which is triple the frequency.

It is possible to transmit and receive any frequency that is an odd multiple of the fundamental frequency (350 KHz), that is, 1, 3, 5, ..., But the reason is that the amplitude decreases as the frequency increases. Therefore, it is practically preferable to use up to three times. Here, the current accuracy is ± about 1.0 (%). The selection of the basic frequency is not limited to this, and any frequency can be selected, but in this embodiment, the frequency serving as the measurement point is about 400 (KHz) to 1 M (KHz). Therefore, it is set so as to include these frequencies.

As shown in FIGS. 1 and 3, the wave transmitter / receiver 1 having the above-mentioned structure is attached so that the wave receiver / transmitter main body 3 is immersed in the liquid 18 in the settling tank. In this state, 2 (350 (KHz) and 1050 (KHz)) from the transmitter / receiver main body 3
Ultrasonic waves of the type are transmitted downward. Then, an interface 19 between the sludge 17 (see FIG. 1) which is a sediment and the liquid 18
And receives various reflected waves including the reflected wave reflected at to generate a reception signal.

As shown in FIGS. 1 and 2, the received signal emitted from the transmitter / receiver main body 3 is sent to the frequency automatic selection switch 23 via the connection cable 7 and the receiving circuit 24. It is output via 25.

The receiving circuit 24, which is composed of a filter or the like, receives a relatively low frequency, in this case, a frequency of 350 (KHz), which is the basic frequency, and directs it to the automatic frequency selection switch 23, that is, switching means. Output. The receiving circuit 25 has a frequency 10 times as high as three times the fundamental frequency.
It receives a frequency of 50 (KHz) and outputs it to the automatic frequency selection switch 23. The automatic frequency selection switch 23 inputs a signal having both of these frequencies to the signal processing arithmetic circuit 26 based on the switching signal S output from the signal processing arithmetic circuit 26 as an arithmetic control circuit. Signal processing arithmetic circuit 2
6 is composed of a microcomputer and the like, and 35
The signal of 0 (KHz) or the frequency of 1050 (KHz) is discriminated as the optimum interface signal, and the optimum interface signal determines the time from the transmission to the reception or the attenuation of the reflected wave. Is calculated, and the position of the sludge interface, that is, the depth from the liquid surface is calculated based on this.

The transmitting circuit 27 shown in FIG. 2 is a circuit for transmitting ultrasonic waves at a basic frequency of 350 (KHz).

With the above configuration, 1
It is possible to transmit and receive two or more types of frequencies using one transducer body 3, and even if two or more transducers have to be prepared conventionally, one transducer body can handle can do.

The fluid ejecting means including the nozzle 14 described above is operated in conjunction with the operation of the above-mentioned wave transmitter / receiver main body 3, that is, the transmission / reception of ultrasonic waves. That is, the valve 13 is composed of, for example, an electromagnetic valve, and the valve 13 automatically opens and closes in response to a contact signal from the wave transmitter / receiver main body 3, or vice versa. The wave body 3 is adapted to operate. The rotation member 5 is rotationally driven by the operation of the fluid ejecting means,
The wave transmitting / receiving surface 3 a of the wave transmitter / receiver main body 3 is wiped by the hairy member 8.

By the way, in the wave transmitter / receiver 1, the wiping with the bristle member 8 is performed over substantially the entire wave transmitting / receiving surface 3a of the wave transmitter / receiver main body 3 as described above. Therefore, even if sludge or the like adheres to any part of the center part and the peripheral part of the wave transmitting / receiving surface 3a, it is removed, the adhesion is prevented, the reception signal level is maintained at an appropriate value, and the interface position is measured. Can always be performed stably and reliably.

Further, in the wave transmitter / receiver 1, the wave transmitting / receiving surface 3a of the wave transmitter / receiver main body 3 is made flat without providing a dome-shaped member or the like. As a result, the directional characteristics of the ultrasonic waves are blunted, and the reception signal level is not attenuated even if a slight angle shift occurs when the transducer 1 is attached.

Further, in the wave transmitter / receiver 1, the following constitution is adopted as a concrete example of the wiping means for performing the above-mentioned wiping action, and a unique effect is exhibited.

That is, a rotating member 5 having a rotation diameter substantially equal to or larger than the diameter of the wave transmitting / receiving surface 3a of the wave transmitter / receiver main body 3 and having a rotation axis orthogonal to the wave transmitting / receiving surface 3a. A wiping means including a driving means for rotationally driving the rotating member 5 and an adhering matter removing member attached to the rotating member 5. Since the wiping means having this configuration wipes by the smooth rotation operation of the rotating member 5, vibration is less likely to occur, and the efficiency of removing adhering substances is high, and the effect is compact.

Moreover, by using the hair removing member 8 as the extraneous matter removing member, the wave receiving / transmitting surface 3a of the wave transmitting / receiving body 3 is formed.
A large frictional force is not generated between them and the sludge and the like can be removed more efficiently, and the hair-like member 8 easily increases the durability, so that the removing function is not impaired for a long period of time. Incidentally, the attached matter removing member is not limited to the hair-like member 8 and various other materials such as woven cloth can be used.
The bristle member 8 having such an advantage is particularly useful.

In addition, in the wave transmitter / receiver 1, the rotating member 5 is formed in a blade shape, and the driving means is composed of fluid ejecting means for ejecting a fluid to the rotating member 5 to rotate the fluid. In this way, by adopting a configuration in which a pressurized fluid is used for rotation without using an electric motor such as a motor, a strict airtight treatment unlike the case of the motor is not required,
There are few failures. Moreover, the ejected fluid itself is efficient because it also removes and prevents deposits.

[0045]

As described above, in the wave transmitter / receiver according to the present invention, the adhering material is wiped by the wiping means over substantially the entire wave transmitting / receiving surface of the wave transmitter / receiver body. Therefore, even if sludge or the like adheres to any part of the central part of the transmitting and receiving surface and its peripheral part, it is removed and the adhesion is prevented, and the reception signal level is maintained at an appropriate value to measure the interface position. It can always be performed stably and reliably. Further, in the wave transmitter / receiver according to the present invention, by making the wave transmitting / receiving surface of the above-mentioned wave transmitter / receiver body a flat surface without providing a dome-shaped member or the like, the directional characteristics of ultrasonic waves are dulled and Even if there is a slight angle deviation, the received signal level will not be attenuated. Further, in the wave transmitter / receiver according to the present invention, the following configuration is adopted as a specific example of the wiping means, and a unique effect is exhibited. That is, a rotating member having a rotation diameter substantially equal to or larger than the diameter of the wave transmitting / receiving surface of the wave transmitting / receiving body and having a rotation axis orthogonal to the wave transmitting / receiving surface, and rotationally driving the rotating member. The wiping means is provided with a driving means and an adhering matter removing member attached to the rotating member. Since the wiping means having this structure wipes by the smooth rotation operation of the rotating member, vibrations are less likely to occur, and the efficiency of removing deposits is high, and the effect is compact. Further, by using a hair-like member for the deposit removing member, sludge and the like can be removed more efficiently without causing a large frictional force between the wave transmitting / receiving surface of the wave transmitter / receiver body. Since the bristle member easily enhances the durability, the removing function is not impaired for a long period of time. Incidentally, the attached matter removing member is not limited to this hair-like member, and various other materials such as woven fabric can be used, but the hair-like member having such advantages is particularly useful. In addition, in the wave transmitter / receiver according to the present invention, the rotating member is formed in a blade shape, and the driving means is composed of a fluid ejecting means for ejecting a fluid to the rotating member to rotate the fluid. As described above, by adopting the configuration in which the electric fluid such as the motor is not used and the fluid is rotated by using the pressurized fluid, a strict airtight treatment unlike the case of the motor is not necessary and the breakdown is small. Moreover, the ejected fluid itself is efficient because it also removes and prevents deposits.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a main part of an interface measuring device including a wave transmitter / receiver for measuring a suspended foreign matter interface as a first embodiment of the present invention, and a water surface, an interface, a bottom surface, and the like.

2 is a block diagram showing a detection circuit of the interface measuring apparatus shown in FIG.

FIG. 3 is a vertical cross-sectional view of a wave transceiver according to an embodiment of the present invention.

FIG. 4 is a view taken along the line FF in FIG.

FIG. 5 is a schematic diagram showing a state in which an interface position is measured by an interface measuring device including a wave transmitter / receiver as a first conventional example.

6 is a diagram showing a received signal level in the interface measuring device shown in FIG.

FIG. 7 is a vertical cross-sectional view of a wave transmitter / receiver as a second conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wave transmitter / receiver 3 Wave transmitter / receiver main body 3a (wave transmitter / receiver main body 3) Wave transmitting / receiving surface 5 Rotating member 7 Connection cable 8 Hair-like member (adhesion removing member) 9 Pipe 10 Guide tube 12 Pressurizing pump 13 Valve 14 Nozzle 17 Sludge 18 Liquid 19 Interface

Claims (5)

[Claims] 1. A wave transmitter / receiver main body having a wave transmitting / receiving surface for transmitting / receiving ultrasonic waves, and a wiping means for wiping off adhered matter adhering to the wave transmitting / receiving surface, wherein the wiping means wipes substantially the entire wave transmitting / receiving surface. A transmitter / receiver characterized by: 2. The transducer according to claim 1, wherein the transmitting / receiving surface is a flat surface. 3. The rotating member, wherein the wiping means has a rotation diameter substantially equal to or larger than the diameter of the wave transmitting / receiving surface and is arranged so that a rotation axis is orthogonal to the wave transmitting / receiving surface.
The transducer according to claim 1 or 2, further comprising: a driving unit that rotationally drives the rotating member, and an adhering matter removing member that is attached to the rotating member. 4. The adhering substance removing member comprises a hair-like member implanted in the rotating member.
The listed transducer. 5. The rotating member is blade-shaped, and the drive unit is a fluid ejecting unit that ejects fluid to the rotating member to rotate the fluid. The transducer according to 1.