JP2008164362A - Ultrasonic sludge concentration measuring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic sludge concentration measuring device which prevents the strength reduction or breakage of an elastic member, considerably enhancing the service life of the elastic member. <P>SOLUTION: In the ultrasonic sludge concentration measuring device 1, a main pipe 2 for flowing sludge therethrough is provided with a communication port 10. A measuring chamber 4 is disposed to the communication port 10 through a control valve 3. After the control valve 3, sludge present in the measuring chamber 4 is pressed by a pressing means. A ultrasonic wave is sent to the sludge and received therefrom by an ultrasonic transmission/reception 5 provided for the measuring chamber 4 to determine the attenuation. The concentration of the sludge is calculated based on the attenuation. Characteristically, the ultrasonic sludge concentration measuring device 1 includes an elastic member 24 covering an opening 23 provided for the measuring chamber 4, an outer covering member 25 covering the outside of the elastic member 24 to define a pressure chamber 6, and a protection cover 7 covering the elastic member 24 on the pressure chamber 6 side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ultrasonic sludge concentration measuring apparatus for measuring a sludge concentration in sludge.

  Conventionally, the sludge concentration, which is the content ratio of suspended solids in sludge (hereinafter, sludge is a mixture of solid suspended solids such as organic matter, inorganic matter and microorganisms and liquid moisture) is measured. Various types of sludge densitometers already exist and are in practical use. And there are an optical method, an ultrasonic method, a microwave method, etc. in the measuring method which measures the sludge density | concentration in waste_water | drain in real time. The light system irradiates the target sludge with light such as visible light, infrared light, laser light, etc. from the irradiation part of the measuring device, measures the amount of light with the light receiving part arranged opposite the irradiation part, and attenuates the light This method measures the sludge concentration from the amount.

  The ultrasonic method transmits ultrasonic waves into the target sludge from the transmitter of the measuring device, receives the ultrasonic waves at the receiver arranged opposite the transmitter, and measures the sludge concentration from the attenuation of the ultrasonic waves. It is a method to do. In the microwave method, microwaves are transmitted from the transmitting unit of the measuring apparatus into the target sludge, and the microwaves are received by a receiving unit disposed opposite to the transmitting unit. The microwave has a characteristic that the phase difference of the wave becomes larger when transmitted / received in sludge containing a large amount of suspended solids than when transmitted / received in fresh water. The microwave method is a method for measuring the sludge concentration from the magnitude of the phase difference using this characteristic. The light method has a drawback that it is easily affected by the chromaticity of the sludge to be measured. When light passes through water, the higher the chromaticity of the water, the more it is absorbed and attenuated, so even if it is sludge that has the same sludge concentration as sampled and analyzed, Higher sludge is measured at a higher sludge concentration than that of lower chromaticity. Therefore, in the case where sludge having a large chromaticity change every hour or every day is to be measured, the optical sludge concentration measuring device is not suitable.

The microwave method has the advantage that it is less susceptible to the chromaticity of the sludge to be measured and air bubbles, but it is susceptible to electrical conductivity and causes measurement errors. In addition, the microwave-type sludge concentration measuring device is more expensive than the other types.
The ultrasonic method has the great advantage that it is less susceptible to the chromaticity of the sludge to be measured and is cheaper than that of the microwave method. On the other hand, the sludge contains many bubbles. However, due to the influence, the measured value shows a larger value than the actual value, or in the worst case, the measurement becomes impossible. This is because when the ultrasonic wave collides with bubbles in the sludge, the ultrasonic wave diffuses and attenuates there, or the ultrasonic wave does not propagate to the receiving unit.

  Therefore, the applicant of the present invention invented the sludge concentration measuring device described in Patent Document 1 in order to solve the problem of the influence of bubbles in the sludge on the sludge concentration measurement, which is a drawback of the ultrasonic sludge concentration measuring device. did.

  The sludge concentration measuring device described in Patent Document 1 is a sludge concentration measuring chamber (measuring chamber) provided with a concentration sensor (ultrasonic transmitter / receiver) that branches from and communicates with a sludge main pipe (main pipe portion) through which measured sludge flows. And has an on-off valve (control valve) that separates the sludge main pipe (main pipe section) and the sludge concentration measurement chamber (measurement chamber), and the sludge concentration measurement chamber (measurement chamber) has a diaphragm ( An elastic member) and a pressurizing chamber. And when measuring the sludge density | concentration of sludge, it is performed with the following processes.

(1) Sludge is forcedly introduced from the sludge main into the sludge concentration measurement chamber by the flow of the sludge main or by the rotational drive of the valve body when the on-off valve is closed.
(2) Close the on-off valve to shut off the sludge concentration measurement chamber from the sludge main, and make the sludge sealed.
(3) Supply pressurized air to the pressurizing chamber with an air compressor or the like to pressurize the pressurizing chamber.
(4) Since the pressurizing chamber is pressurized, the diaphragm is pushed into the sludge concentration measuring chamber, thereby pressurizing the sludge in the sludge concentration measuring chamber.
(5) By pressurizing, bubbles present in the sludge are dissolved in the water of the sludge and defoamed.
(6) The sludge concentration of sludge is measured by the concentration sensor.

  In the sludge concentration measuring apparatus described in Patent Document 1, the sludge concentration by ultrasonic waves can be measured without being affected by the bubbles by pressurizing the sludge to dissolve the bubbles in the moisture and extinguishing the bubbles. I was able to get some effect.

Japanese Utility Model Publication 5-39491

  The sludge concentration measuring apparatus described in Patent Document 1 is configured to pressurize a pressurizing chamber with pressurized air and press a diaphragm (hereinafter referred to as “elastic member”). If the volume of the pressurizing chamber is increased, a large amount of pressurized air must be sent during pressurization, so that the volume of the pressurizing chamber is made as small as possible. For this reason, the part where the pressurization chamber side surface of an elastic member and the inner wall of a pressurization chamber have approached has increased. In addition, if the elastic member is damaged, sludge in the sludge concentration measurement chamber (hereinafter referred to as “measurement chamber”) and in the sludge main pipe (hereinafter referred to as “main pipe portion”) flows out into the pressurizing chamber. Then, sludge enters the inside of an air compressor such as a compressor through an air supply pipe for supplying pressurized air, resulting in failure. As a countermeasure, a leak detector (hereinafter referred to as “leakage detector”) that senses that sludge has flowed into the pressurizing chamber is provided.

  Here, when the inside of the sludge pipe in which the sludge concentration measuring device is installed is in a positive pressure state equal to or higher than a predetermined pressure, the elastic member is pushed out to the pressurizing chamber side by the sludge, and the elastic member swells. In this case, the pressure of the elastic member on the pressure chamber side surface is rubbed against the inner wall of the pressure chamber, or comes into contact with an acute angle portion of the pressure chamber or a leak detector, so that the strength of the elastic member is reduced and this is repeated. In general, there has been a problem that the elastic member is damaged in a shorter period than the expected service life of the elastic member.

  On the other hand, when the sludge to be measured is concentrated sludge concentrated in the concentration tank, digested sludge from the digestion tank, or dehydrator-supplied sludge before dehydration by the dehydrator, it is caused by an anaerobic reaction in the sludge. Gases such as methane are generated and often exist in the form of bubbles. In addition, air mixed during aerobic treatment or the like may exist in the form of bubbles as it is. If there is a large amount of gas generated or if a large amount of air remains, the bubbles are bound together in the main pipe of the sludge pipe through which the sludge flows and the sludge concentration measuring device installed in the flow path. As a result, it becomes larger and floats and separates upward due to buoyancy, and stays as a gas reservoir above the cross section of the main pipe.

  When such a sludge is measured with a sludge concentration measuring device described in Patent Document 1, a gas reservoir may flow into the measurement chamber together with the sludge. At this time, if the process of pressurizing the sludge to eliminate the bubbles is performed, the sludge is a fluid having a very low compressibility, whereas the gas reservoir is a fluid having a high compressibility. Even if pressure is applied, the gas reservoir is preferentially compressed, bubbles in the sludge do not dissolve in the moisture, and the gas reservoir does not dissolve in the moisture of the sludge. May not be measured accurately or may become impossible to measure.

  In addition, when the capacity of the gas pool in the sludge concentration measurement chamber is large, the elastic member is usually shaped to have a convex surface on the pressurization chamber side, but the convex surface is pushed into the measurement chamber side, and the measurement chamber side The so-called reversal phenomenon occurs, and the sludge concentration is not accurately measured, and when the on-off valve is opened, it contacts the convex surface of the elastic member and damages the elastic member. Or may block the flow path, which is a problem.

  In addition, if the sludge pipe is in an environment that tends to be in a negative pressure state, such as a sludge concentration measuring device installed on the suction side of the transfer pump of the sludge pipe, the elastic member will be sucked into the measurement chamber side, A reversal phenomenon may occur, which is a problem.

  Furthermore, in the sludge concentration measuring apparatus described in Patent Document 1, as described above, a leak detector is disposed in the pressurizing chamber as a countermeasure for sludge leakage. This leak detector is arranged in a direction parallel to the elastic member in consideration of reducing the necessary installation space of the sludge concentration measuring device. Therefore, a terminal for connecting the wiring of the leak detector protrudes to the side of the pressurizing chamber, and a cover for protecting the terminal is attached. The outer box forming the pressurizing chamber has a flange-shaped end attached to the measurement chamber, and is attached to the outer wall of the measurement chamber with a bolt.

  When assembling this sludge concentration measuring device at the factory, first attach the outer box (hereinafter referred to as “exterior member”) to the measurement chamber, then attach the leak detector to the outer cover member, and connect the wiring to the terminal. Finally, the terminal storage box is attached. However, when performing maintenance such as cleaning the measurement chamber, it is not normally removed unless maintenance such as replacement of the leak detector itself is performed. Therefore, during maintenance work, if the bolt is turned with a spanner or the like to remove the outer cover member from the measurement chamber with the leak detector or terminal storage box attached to the outer cover member, the leak detection protruding from the outer cover member There is a problem that the container and the terminal storage box become obstructive, the workability in maintenance and the like is very poor, and it takes a long time.

The present invention has been made to solve the above-described problems. When the sludge pipe is in a positive pressure state, the elastic member is pushed out to the pressurizing chamber side, and the leak detector or pressurizing chamber It is an object of the present invention to provide an ultrasonic sludge concentration measuring apparatus that can prevent a decrease in strength or damage of an elastic member due to the elastic member coming into contact with a wall and can greatly improve the service life of the elastic member.
This invention is caused by the fact that a gas reservoir flows in along with the sludge from the sludge pipe to the measurement chamber, and the phenomenon that bubbles in the sludge do not dissolve even if the measurement chamber is pressurized with an elastic member occurs. It is an object of the present invention to provide an ultrasonic sludge concentration measuring apparatus that can prevent the reversal phenomenon that the convex surface of the elastic member is reversed to the measurement chamber side.
The present invention provides an ultrasonic sludge concentration measuring apparatus capable of preventing an elastic member from being sucked into a measurement chamber and causing an inversion phenomenon of the elastic member in an environment where sludge piping is likely to be in a negative pressure state. The purpose is to provide.
In this invention, when removing the outer cover member from the measurement chamber when performing maintenance such as cleaning of the measurement chamber, the leakage detector and the terminal storage box protruding from the outer cover member become an obstacle, and it takes a long working time. An object of the present invention is to provide an ultrasonic sludge concentration measuring device that can prevent this.

In order to solve the above problems, the ultrasonic sludge concentration measuring apparatus of the present invention is
A communication port is provided in the main section where sludge flows.
A measurement chamber is arranged at the communication port via a control valve,
Close the control valve and pressurize the sludge in the measurement chamber with pressurizing means,
In the ultrasonic sludge concentration measuring apparatus for measuring the amount of attenuation by transmitting and receiving ultrasonic waves to and from the sludge by the ultrasonic transmitter / receiver provided in the measurement chamber, and calculating the sludge concentration from the amount of attenuation,
An elastic member covering an opening provided in the measurement chamber;
An outer covering member that covers the outside of the elastic member and forms a pressurizing chamber;
And a protective cover that covers the elastic member on the pressurizing chamber side.
The ultrasonic sludge concentration measuring apparatus according to claim 2 of the present invention is characterized in that the protective cover has air circulation holes.
According to a third aspect of the present invention, there is provided an ultrasonic sludge concentration measuring apparatus, wherein a communication port is provided in a main pipe portion through which sludge flows, a measurement chamber is provided in the communication port via a control valve, and the control valve is closed. And pressurizing the sludge in the measurement chamber with a pressurizing means, and transmitting and receiving ultrasonic waves to and from the sludge by an ultrasonic transmitter / receiver provided in the measurement chamber, and measuring the attenuation amount. In the ultrasonic sludge concentration measuring apparatus that calculates the above, an elastic member that covers the opening provided in the measurement chamber, an outer covering member that covers the outside of the elastic member and forms a pressurizing chamber, a main pipe section, and / or Alternatively, a gas discharge port and a discharge control valve provided in the upper part of the measurement chamber are provided.
The ultrasonic sludge concentration measuring apparatus according to claim 4 of the present invention is characterized in that the pressurizing means has an air supply pipe provided with an air control valve for supplying compressed air from an air supply source to the pressurization chamber. Features.
The ultrasonic sludge concentration measuring apparatus according to claim 5 of the present invention is characterized in that the outer covering member can be divided.

  The ultrasonic sludge concentration measuring apparatus according to the present invention is provided with a protective cover that protects the pressure chamber side surface of the elastic member, so that the sludge pipe is in a positive pressure state equal to or higher than a predetermined pressure, and the elastic member is caused by the sludge. Even when the pressure member is pushed out to the pressurizing chamber side, the protective cover supports the elastic member, so that the elastic member is further prevented from expanding to the pressurizing chamber side. There is an effect that the surface can be prevented from rubbing against the inner wall of the pressurizing chamber, the sharp angle portion of the pressurizing chamber wall or the detection electrode of the leak detector, and the strength of the elastic member from greatly decreasing. Moreover, there exists an effect which can prevent that an elastic member breaks in a short period rather than the service life expected from the elastic fatigue etc. by normal use by strength reducing.

  In the ultrasonic sludge concentration measuring apparatus according to claim 2 of the present invention, the air flow hole is provided in the protective cover, so that the compressed air in the pressurized chamber passes through the air flow hole of the protective cover and presses the elastic member. Therefore, it is not necessary to provide a notch for allowing air to pass through the inner wall surface of the outer covering member. When the outer cover member is made of cast iron or the like, the processing accuracy of the notch is low, and the protective cover, the notch of the outer cover member, and the elastic member are close to each other. In some cases, the notch is blocked and the function of circulating air is not exhibited, and the pressure of compressed air is not transmitted to the elastic member. By providing the air circulation hole in the protective cover, the air circulation hole is not blocked by the outer cover member or the like, so that there is an effect that the compressed air is reliably transmitted to the elastic member.

  The ultrasonic sludge concentration measuring apparatus according to claim 3 of the present invention is provided with a gas discharge port and a discharge control valve for controlling the discharge of gas at the upper part of the main pipe and the measurement chamber, so that the main pipe and the measurement are performed. Even when a gas pool is formed in the room, it can be appropriately discharged to the outside. Accordingly, there is an effect that it is possible to prevent a phenomenon in which bubbles in the sludge are not dissolved even when the measurement chamber generated due to the gas accumulation is pressurized. In addition, since the gas reservoir can be discharged to the outside, the inversion phenomenon of the elastic member due to this can be prevented. Therefore, there is an effect of preventing the damage of the elastic member caused by the reversal phenomenon and the harmful effect of blocking the flow path.

  The ultrasonic sludge concentration measuring apparatus according to claim 4 of the present invention has the following effects by providing the air control valve in the air supply pipe that supplies the compressed air to the pressurizing chamber. That is, even when the ultrasonic sludge concentration measuring device of the present invention is installed in an environment where the sludge piping is likely to be in a negative pressure state, such as the suction side of the transfer pump of the sludge piping, the compressed air supply to the pressurizing chamber The air control valve can be closed at times other than when the compressed air is discharged from the pressurizing chamber, and the inflow and outflow of air from the pressurizing chamber can be prevented. And when the air control valve is closed, air does not flow into the pressurizing chamber even if the measurement chamber is in a negative pressure state, so that the elastic member is not pulled and reversed to the measurement chamber side. In other words, there is an effect that the inversion phenomenon of the elastic member can be prevented.

  The ultrasonic sludge concentration measuring apparatus according to claim 5 of the present invention is configured so that the pressurization part and the electrode storage part of the outer cover member can be divided, and the pressurization part and the electrode storage part are provided with a housing, a connector, and a clip. The following effects can be obtained by making it rotatable or detachable. That is, when the fixing bolt is turned with a spanner or the like to remove the outer cover member from the measurement chamber when performing maintenance such as cleaning in the measurement chamber, even if the electrode storage portion or the terminal storage box protrudes from the outer cover member, The work space for using a spanner etc. can be secured by removing the electrode housing part from the pressurizing part or rotating the electrode housing part, making it easier to remove the outer cover member and shortening the work time. effective.

Embodiment 1 FIG.
FIG. 1 is a front view of the ultrasonic sludge concentration measuring apparatus according to Embodiment 1, and FIG. 2 is a cross-sectional view taken along line AA of the ultrasonic sludge concentration measuring apparatus of FIG. The ultrasonic sludge concentration measuring apparatus 1 according to Embodiment 1 includes a main pipe section 2, a control valve 3, a measurement chamber 4, an ultrasonic transmitter / receiver 5, a pressurizing chamber 6, a protective cover 7, and a control. It is mainly composed of the device 8.

  The main pipe section 2 is disposed between the sludge pipes that convey the sludge, introduced from the upstream sludge pipe, measures the sludge concentration in the measurement chamber 4, and discharges the sludge from the measurement chamber 4 after the concentration measurement. Then, it is sent out to the downstream sludge piping. The control valve 3 rotates a valve body 28, which will be described later, to open and close the flow path between the main pipe section 2 and the measurement chamber 4, and opens the valve body 28 when sludge is introduced into and discharged from the measurement chamber 4. Thus, the main pipe part 2 and the measurement chamber 4 are communicated, and the valve body 28 is closed at the time of sludge concentration measurement to separate the main pipe part 2 and the measurement chamber 4. The ultrasonic transmitter / receiver 5 transmits ultrasonic waves to the sludge introduced into the measurement chamber 4 and measures the sludge concentration from the attenuation amount. The pressurizing chamber 6 is a chamber to which compressed air is supplied at the time of measuring the sludge concentration, and the compressed air pushes the elastic member 24 toward the measuring chamber 4 to pressurize the sludge in the measuring chamber 4, and thus in the sludge. Air bubbles can be dissolved in the water in the sludge. The protective cover 7 suppresses the swelling of the elastic member 24 toward the pressurizing chamber, and the controller 8 controls the ultrasonic sludge concentration measuring apparatus 1.

  A flange 9 having a plurality of bolt holes 9a is provided at both ends of the main pipe portion 2, and is installed with a flange connection between sludge pipes (not shown) through which sludge flows. A communication port 10 (see FIG. 2) communicating with the measurement chamber 4 is provided on the circumferential surface of the main pipe part 2 in the horizontal direction, and a repair gate 11 is provided on the outer peripheral surface of the main pipe part 2 of the communication port 10. The valve box 3a of the control valve 3 and the cylindrical peripheral wall member 13 are stacked and arranged so that the flow paths communicate with each other in order. A flange portion 14 having a plurality of bolt holes is formed at the end of the peripheral wall member 13 opposite to the control valve 3. And the flange part 14 and the repair gate 11 or the main pipe part 2 are connected by the through-bolt 15, whereby the valve box 3 a of the control valve 3 is sandwiched between the peripheral wall member 13 and the repair gate 11. . A projecting portion 17 is provided on the inner peripheral wall of the main pipe portion 2 facing the communication port 10 and on the upstream side of the sludge inlet 16a. The protrusion 17 has an effect of urging the sludge flowing into the sludge outlet 16b toward the communication port 10 when the sludge flowing in from the sludge inlet 16a contacts the protrusion 17.

  The repair gate 11 has its water stop function lowered due to deterioration of the control valve 3 and the like, and needs to be replaced. Further, the flow of the sludge in the sludge pipe in which the ultrasonic sludge concentration measuring device 1 is installed is temporarily changed. This is an emergency gate valve to be used when it cannot be stopped immediately. The repair gate 11 has a plate-like valve body 19 to which a slide nut 18 with an internal thread cut inside is attached by welding or the like, and the valve body 19 can slide to block the communication port 10. The valve box 20 has a groove and the operation handle 22 that slides the valve element 19 by fitting the bolt 21 with the slide nut 18 and rotating it with a spanner or the like. In Embodiment 1, the operation handle 22 has a quadrangular prism shape, but may have a hexagonal column shape or other polygonal column shape.

  An opening 23 is provided on the side of the peripheral wall member 13 where the flange portion 14 is formed. The opening 23 is covered with an elastic member 24 having a convex surface protruding in a hemispherical shape toward the outside of the measurement chamber 4. The elastic member 24 is made of an elastic material such as resin rubber or plastic resin that can expand and contract. In this Embodiment 1, the elastic member 24 is comprised with the raw material which pinched | interposed the fiber with resin rubber. A hemispherical protective cover 7 for protecting the elastic member 24 is disposed on the convex surface of the elastic member 24 on the pressure chamber 6 side. An outer cover member 25 is disposed on the outer side of the protective cover 7 so as to cover them. The measurement chamber 4 is partitioned and formed in a space surrounded by the valve body 28, the peripheral wall member 13, and the elastic member 24 of the control valve 3 when the control valve 3 is closed.

  A flange portion 26 having a plurality of bolt holes is formed on the outer peripheral edge portion of the outer cover member 25 on the side in contact with the elastic member 24, and the flange portion 24 a of the elastic member 24 is connected to the bolt hole. Has a bolt hole. A screw hole in which a female screw is cut is formed in the end surface of the peripheral wall member 13 on the outer covering member 25 side, and a bolt 27 can be fastened to the screw hole. By fastening the bolt 27 to the screw hole through the flange portions 26 and 24a, the flange portion 26 of the outer cover member 25, the flange portion 24a of the elastic member 24, and the peripheral wall member 13 are in close contact with each other.

  The protective cover 7 is made of a metal plate, and the outer peripheral edge of the protective cover 7 is fixed to the inner wall surface of the outer cover member 25 with an adhesive, an adhesive tape, or the like. Thereby, even if the convex surface of the elastic member 24 deform | transforms, the position of the protective cover 7 is prevented from deviating. Thereby, when the position is moved when the protective cover 7 is not fixed, it is possible to prevent the outer peripheral edge of the protective cover 7 from being pierced by the elastic member 24 and damaging the surface. Note that an adhesive or the like may be applied to the entire periphery of the outer peripheral edge of the protective cover 7 and adhered and fixed to the inner surface of the outer cover member 25. However, it is necessary to remove the protective cover 7 when maintaining the inside of the pressurizing chamber 6 In consideration of the fact that there is a case where an adhesive occurs, an adhesive or the like is applied to several points (for example, 4, 6, 8, etc.) of the outer peripheral edge of the protective cover 7 to adhere to the inner surface of the outer cover member 25. It is more preferable to fix.

  Further, a flange having a bolt hole is provided on the outer peripheral edge portion of the protective cover 7, the flange is sandwiched between the flange portion 26 and the flange portion 24a of the elastic member 24, and the bolt 27 is inserted into the bolt hole of each flange. The protective cover 7 may be detachably fixed by attaching to the peripheral wall member 25. However, the flange of the protective cover in this case has a smooth surface in contact with the flange portion 24a. When the bolt 27 is tightened with the bolt 27, the flange portion 24a has elasticity, so the surface of the flange of the protective cover 7 slides, and the bolt Even if tightening 27 is continued, the elastic member 24 continues to extend toward the center of the convex surface and cannot be fixed sufficiently, and the watertight state of the measurement chamber 4 may be insufficient. In this case, the flange surface of the protective cover 7 may be roughened so that the flange portion 24a is fixed by friction.

  Here, it is desirable that the protective cover 7 is made of stainless steel, which is relatively inexpensive among materials having high rigidity and corrosion resistance. However, if more corrosion resistance is required, the protective cover 7 may be made of a material such as titanium, and has a corrosion resistance. If the environment may be somewhat inferior, a material such as steel may be used, and further, aluminum, copper, or a copper-based alloy that is thicker but has higher corrosion resistance than steel may be used. Further, engineering plastic having high rigidity may be used. An air circulation hole 33 is opened at the apex of the semicircular sphere of the protective cover 7. The compressed air supplied to the pressurizing chamber 6 surely presses the elastic member 24 when the compressed air in the pressurizing chamber 6 flows in and out of the air circulation hole 33 of the protective cover 7, and the inside of the measuring chamber 4 The sludge is pressurized.

  The ultrasonic transmitter / receiver 5 includes an ultrasonic transmitter / receiver 5 a and a converter 30. On the circumferential surface of the cylindrical peripheral wall member 13 in the horizontal direction, ultrasonic transducers 5a are arranged so as to face each other. The ultrasonic transmitter / receiver 5a and the transducer 30 are connected by electric wiring, and when measuring the sludge concentration, a current of a predetermined magnitude is supplied from the transducer 30 to one of the ultrasonic transmitter / receivers 5a. Is activated to transmit an ultrasonic wave of a predetermined intensity into the measurement chamber 4, receive the ultrasonic wave by the other ultrasonic transmitter / receiver 5 a, and convert it into a current value corresponding to the intensity of the ultrasonic wave received by the internal oscillator. Then, a current is passed through the converter 30. Then, the converter 30 calculates the sludge concentration value from the current value received from the ultrasonic transceiver 5a. The magnitude of current generated when the ultrasonic transceiver 5a receives ultrasonic waves increases as the intensity of the received ultrasonic waves increases. That is, as the suspended matter concentration in the sludge in the measurement chamber 4 is higher (sludge concentration is higher) and the attenuation amount of the ultrasonic wave is larger, the current value generated from the ultrasonic transducer 5a on the receiving side is smaller. Based on the above theory, the ultrasonic transmitter / receiver 5 measures the sludge concentration in the measurement chamber 4 from the attenuation amount of ultrasonic waves.

  Note that the ultrasonic transmitter / receiver 5a can perform two roles: one for transmitting ultrasonic waves and one for receiving ultrasonic waves and converting them into current values. The two ultrasonic transmitters / receivers 5a alternate the roles of the transmitting side and the receiving side to alternately transmit / receive ultrasonic waves, and the average value of each measured sludge concentration value is used as a measured value to improve measurement accuracy. be able to. In addition, only one ultrasonic transmitter / receiver 5a is installed, and a reflecting plate is installed instead of the ultrasonic wave transmission / reception at the opposite position, that is, the position where another ultrasonic transmitter / receiver 5a is installed. The ultrasonic wave transmitted by the child 5a may be reflected by the reflecting plate and received by the same ultrasonic transceiver 5a. Thereby, the manufacturing cost of the ultrasonic sludge concentration measuring apparatus 1 can be reduced. However, since the propagation distance of the ultrasonic wave is doubled, it is necessary to increase the intensity of the ultrasonic wave that is controlled by the converter 30 and transmitted from the ultrasonic transceiver 5a.

  The outer cover member 25 includes a hemispherical pressure portion 31 and a cylindrical electrode storage portion 32. The electrode housing portion 32 is provided with an insertion hole in the cylinder cross-sectional direction and an air inlet 32a through which compressed air flows in the cylinder circumferential surface direction. A terminal storage box 35 in which a leakage detector 34 is disposed is installed in the insertion hole on the side of the electrode storage portion 32, and the electrode 36 of the leakage detector 34 is inserted into the space in the electrode storage portion 32. ing. The pressurizing chamber 6 is formed in a space surrounded by the elastic member 24, the outer covering member 25, and the terminal storage box 35. A communication port 29 is formed at the boundary between the pressure unit 31 and the electrode storage unit 32. The communication port 29 is opened in order to introduce the compressed air that has entered the electrode housing portion 32 into the pressurizing portion 31 or to exhaust the compressed air in the pressurizing portion 31 to the atmosphere via the electrode housing portion 32. ing. The terminal storage box 35 is formed so as to extend in the longitudinal direction of the main pipe part 2 in order to reduce the amount of protrusion from the main pipe part 2 to the side, and the leak detector 34 also has an electrode 36 of the main pipe part 2. It arrange | positions so that it may extend in a longitudinal direction.

  An air supply pipe 37 that supplies compressed air is connected to the air inlet 32 a of the electrode storage portion 32. The air supply pipe 37 includes an air compressor 38 that is an air supply source that generates compressed air to be supplied to the pressurizing chamber 6, an air tank 39 that stores the compressed air, and compressed air from the air tank 39 to the pressurizing chamber 6. A flow path switching valve 40 that is a three-way valve that switches between a flow path to be supplied and a flow path for discharging the air in the pressurizing chamber 6 to the outside is provided, and the air pressure in the pressurizing chamber 6 can be adjusted.

  The pressurizing means for pressurizing the sludge includes an air compressor 38 as an air supply source, an air tank 39, an air supply pipe 37 for supplying compressed air to the pressurizing chamber 6, and a flow disposed in the air supply pipe 37. And a path switching valve 40. In the first embodiment, compressed air is supplied to the air supply pipe 37 by the air compressor 38 and the air tank 39. However, there is a compressed air supply facility in the installation site, and the compressed air is supplied. In the case where a compressed air supply pipe is not provided, it may be branched from the compressed air supply pipe and connected to the air supply pipe 37 as an air supply source for supplying compressed air.

  Below the peripheral wall member 13, there is provided a drain drain port 41 capable of discharging sludge in the measurement chamber 4. A drain pipe 43 having a drain valve 42 is connected to the drain outlet 41, and when maintaining the inside of the measurement chamber 4, the control valve 3 is closed and the drain valve 42 is opened. Thus, the sludge in the measurement chamber 4 can be discharged to the outside. Further, a gas discharge port 45 that is normally closed with a closing lid 44 is provided above the peripheral wall member 13. When the sludge is discharged from the drain outlet 41, it may be used to remove the closing lid 44 and allow the air to flow into the measurement chamber 4 to smoothly discharge the sludge. When a gas pool is generated in the measurement chamber 4, it may be used for gas discharge.

  The control valve 3 that opens and closes the valve body 28 uses a so-called butterfly valve as the valve structure, but adopts a pneumatic drive that operates by supplying compressed air from the air tank 39 as a drive system. The drive unit 3b of the control valve 3 includes a cylinder, a piston, and a conversion unit that converts the reciprocating motion of the piston in the cylinder into a rotational motion. The cylinder is provided with an air outflow inlet above and below the piston movable range. An air pipe 39a is connected to the upper air outflow inlet, one end of the air pipe 39b is connected to the lower air outflow inlet, and the other end of each air pipe 39a, 39b is connected to the air tank. The air pipe 39a is provided with a flow control valve 48 that is a three-way valve, and the flow path of the air pipe 39a is a flow path for sending compressed air from the air tank 39 to the air outflow inlet above the cylinder; It is possible to switch to a flow path for discharging the air above the cylinder from the air outflow inlet to the outside. Similarly, each air pipe 39b is provided with a flow control valve 49 which is a three-way valve. The flow path of the air pipe 39b is a flow path for sending compressed air from the air tank 39 to the air outflow inlet below the cylinder. Then, it is possible to switch to a flow path for discharging the air below the cylinder from the air outflow inlet to the outside.

  For example, the conversion part is formed by making a circular hole in the cross section of the piston in the moving direction, cutting a female screw, screwing a shaft in which the male screw is cut into the circular hole, and connecting the circular gear to the center of the gear and the shaft at the lower end of the shaft. It is good to set it as the structure which connected the core coaxially. Then, the end of the valve body 28 opposite to the side to which the valve body 28 is connected is connected to another circular gear and screwed into the circular gear on the shaft side, so that the inside of the drive unit 3b The valve element 28 rotates in accordance with the reciprocating motion of the piston. By converting the gear ratio between the circular gear on the shaft side and the circular gear on the valve stem side from the length of the movable region of the piston, and setting so that the valve body 28 rotates 1/4 by one movement of the piston, For example, the control valve 3 can be opened by one movement to the upper end of the movable range of the piston, and the control valve 3 can be closed by one movement to the lower end of the movable area.

  In order to move the piston upward, the flow path control valve 48 is switched to a flow path for discharging the air in the cylinder above the piston to the outside, and the flow path control valve 49 is moved from the air tank 39 to the compressed air. It is good to switch to the flow path to send in. Conversely, to move the piston downward, the flow control valve 48 is switched to a flow path for sending compressed air from the air tank 39 into the cylinder above the piston, and the flow control valve 49 is switched to the air in the cylinder below the piston. May be switched to a flow path for discharging the gas to the outside. The configuration of the drive unit 3b of the control valve 3 is not limited to this configuration, and any configuration is possible as long as the valve body 29 can be rotated by supplying and discharging air through an air pipe. There may be. Further, any configuration may be used as long as the valve body 29 can be opened and closed by a control signal from the controller 8. For example, a hydraulic valve driven by hydraulic pressure, a water pressure valve driven by hydraulic pressure, an electric valve driven by an electric motor, or an electromagnetic valve driven by electromagnetic force may be used. The reason why the pneumatic drive is applied in the first embodiment is that there are an air compressor 38 and an air tank 39 as pressurizing means, and it is most efficient to use them. Furthermore, the valve structure is not limited to the butterfly valve, and may be a valve structure such as a ball valve or a gate valve.

  The controller 8 is connected to the converter 30, the leakage detector 34, the air compressor 38, the control valve 3, and the flow path switching valves 40, 48, and 49 by electrical wiring, and controls each of them. The electrical wiring connected to the control valve 3 is connected to a limit switch for detecting the position of the valve body 28 built in the control valve 3, and the valve body 28 is opened by the limit switch. The supply of compressed air from the air tank 39 to the drive unit 3b is controlled by detecting the valve closing.

  The leak detector 34 is disposed in the electrode storage portion 32 of the outer cover member 25. Two electric wires to which voltage is applied are drawn from the control panel 8, one of which is connected to the electrode 36 of the leak detector 34, and the other electric wire is an outer covering member of the pressurizing chamber 6. 25. When the elastic member 24 is damaged for some reason and the sludge flows into the pressurizing chamber 6, the electrode 36 and the outer covering member 25 are electrically connected by the sludge as a conductor, and the control panel 8 detects the sludge. The control panel 8 detects that a current flows in the circuit and that sludge has leaked into the pressurizing chamber 6.

As described above, when measuring the sludge concentration, the ultrasonic transmitter / receiver 5 transmits ultrasonic waves by passing a predetermined amount of current from the transducer 30 to one ultrasonic transmitter / receiver 5a, and the other ultrasonic transmitter / receiver. Received at 5a and converted into current, and the converter 30 calculates the sludge concentration from the current value to obtain the sludge concentration value. However, if there are many bubbles in the sludge to be measured, the ultrasonic wave is greatly attenuated or diffused, and the sludge concentration cannot be measured accurately, or the worst measurement is impossible. The ultrasonic sludge concentration measuring apparatus 1 can accurately measure the sludge concentration even for such sludge. The sludge concentration measurement of the ultrasonic sludge concentration measuring apparatus 1 is performed by the following process.
(1) The controller 8 controls the flow path switching valves 48 and 49 to open the control valve 3 and introduce sludge from the main pipe section 2 into the measurement chamber 4.
(2) The controller 8 controls the flow path switching valves 48 and 49 to close the control valve 3 to shut off the measurement chamber 4 from the main pipe section 2, and to make sludge in a sealed state in the measurement chamber 4.
(3) The controller 8 controls the flow path switching valve 40 to supply compressed air from the air tank 39 to the pressurizing chamber 6 to pressurize the pressurizing chamber 6.
(4) Since the inside of the pressurizing chamber 6 is pressurized, the elastic member 24 is pushed into the measuring chamber 4 side, and thereby the sludge in the measuring chamber 4 is pressurized.
(5) By pressurizing the sludge for a predetermined time, the bubbles present in the sludge are dissolved in the moisture, and the bubbles disappear.
(6) A command for measuring the sludge concentration is transmitted from the controller 8 to the converter 30. In the converter 30, an ultrasonic wave is transmitted by flowing a predetermined amount of current through one ultrasonic transceiver 5a, and the ultrasonic wave attenuated by the other ultrasonic transceiver 5a is received and converted into an electric current. Receives it and converts it from the current value to a measured value of sludge concentration.
(7) The measured value of the sludge concentration is displayed from a display panel (not shown) mounted on the converter 30. Alternatively, the measurement value is transmitted as an electrical signal from the converter 30 to the controller 8, the electrical signal is received by the controller 8, and the measurement value is displayed on the display panel provided in the controller 8, or the built-in data logger A configuration may be used in which the data is stored or printed by a printer.

  As described above, the ultrasonic sludge concentration measuring apparatus 1 according to Embodiment 1 is provided with the communication port 10 in the side wall portion of the main pipe portion 2 through which the sludge flows, and the communication port 10 is measured via the control valve 3. The chamber 4 is disposed, the control valve 3 is closed, and the sludge in the measurement chamber 4 is pressurized by an air compressor 38 as an air supply source, an air tank 39 and an air supply pipe 37. The inside of the pressurizing chamber 6 is pressed to press and pressurize the elastic member 24, and is composed of a pair of ultrasonic transducers 5 a and a transducer 30 provided to face the side wall of the measuring chamber 4. An ultrasonic sludge concentration measuring apparatus 1 that transmits and receives ultrasonic waves to and from sludge by an ultrasonic transmitter / receiver 5 and calculates a sludge concentration from the attenuation amount of the ultrasonic waves, and covers an opening 23 provided in the measurement chamber 4. An elastic member 24 and an outer cover that covers the outside of the elastic member 24 and forms the pressurizing chamber 6 With product 25, but with a protective cover 7 which covers the elastic member 24 of the pressure chamber 6 side.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 in the first embodiment, the sludge pipe is in a positive pressure state equal to or higher than the pressure at which the elastic member 24 is pushed toward the pressurizing chamber and expands. Even in such a case, since the surface of the elastic member 24 on the pressure chamber side is supported by the protective cover 7, excessive expansion of the elastic member 24 toward the pressure chamber 6 is suppressed. Therefore, the surface of the elastic member 24 on the side of the pressurizing chamber 6 contacts and rubs against the inner wall of the pressurizing chamber 6 or comes into contact with the acute angle portion of the inner wall of the pressurizing chamber 6 and the electrode 36 of the leak detector 34. Therefore, the elastic member 24 can be prevented from deteriorating without lowering or breaking the strength or causing the electrode 36 to fail. As a result, the problem that the elastic member 24 is damaged in a much shorter period of time than that expected from the material used in the elastic member 24, which has occurred in the conventional ultrasonic sludge concentration measuring apparatus. Can be eliminated.

  Further, since the protective cover 7 has an air circulation hole 33 that allows air to enter and exit from the pressurizing chamber 6 at the apex of the spherical surface portion, the compressed air can surely flow into the elastic member 24 from the pressurizing chamber 6. it can.

Embodiment 2. FIG.
FIG. 3 is a cross-sectional view of the ultrasonic sludge concentration measuring apparatus 1 according to the second embodiment taken along line AA. The front view is the same as FIG. 1 which is a front view of the ultrasonic sludge concentration measuring apparatus 1 of the first embodiment. In the second embodiment, instead of providing the air circulation hole 33 in the protective cover 7 of the first embodiment, a notch 50 is provided on the inner wall of the pressurizing portion 31 of the outer covering member 25, and the pressurizing chamber 6 is provided. The point which is made into the flow path of the compressed air between the elastic member 24 and the elastic member 24 is different. In Embodiment 1, the outer peripheral surface of the protective cover 7 is fixed to the inner peripheral surface of the outer cover member 25 with an adhesive or the like, and there is almost no gap through which the compressed air flowing into the pressurizing chamber 6 flows. When the pressure of the compressed air is difficult to be transmitted to the elastic member 24, especially when the entire outer peripheral surface of the protective cover 7 is bonded and fixed, the compressed air cannot reach the elastic member 24. So that the elastic member 24 is reached. In the second embodiment, one or a plurality of groove-like notches 50 are provided on the inner wall surface of the outer cover member 25 in the direction along the curved surface (from the communication port 29 side toward the flange portion 26 side). The protective cover 7 is bonded and fixed so that no adhesive or the like enters the portion 50.

  Thereby, at the time of sludge pressurization, the compressed air that has entered the pressurizing chamber 6 enters from the cutout portion 50, passes through the space between the outer peripheral edge portion of the protective cover 7 and the cutout portion 50, and the elastic member 24. Can be pressed. When the sludge concentration measurement is finished and the sludge is released from the pressurized state, the flow path switching valve 40 is opened, the compressed air in the pressurizing chamber 6 is released to the atmosphere, and the elastic member 24 and the protective cover 7 The compressed air in between passes through the notch 50 and escapes to the inner wall surface of the pressurizing chamber 6 and the outside of the protective cover 7. Other configurations are the same as the configuration of the ultrasonic sludge concentration measuring apparatus 1 according to the first embodiment, and thus the description thereof is incorporated and detailed description is omitted.

  In addition, the structure which forms the notch part 50 in the opening edge part of the inner wall of the pressurization chamber 6 of Embodiment 2, and sends compressed air between the elastic member 24 and the protective cover 7 from the notch part 50 is mentioned later. It can be applied in combination with the ultrasonic sludge concentration measuring apparatus according to any of Embodiments 3 to 19.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 in the second embodiment, in addition to the effects shown in the first embodiment, the protective cover 7 is covered with the outer covering member 25 during maintenance in the pressurizing chamber 6. At the time of peeling off, there is also an effect that it can be easily removed by inserting a pry opening jig into the notch 50 and peeling off.

Embodiment 3 FIG.
FIG. 4 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to the third embodiment, and FIG. 5 is a cross-sectional view taken along line AA of the ultrasonic sludge concentration measuring apparatus 1 according to the third embodiment. The ultrasonic sludge concentration measuring apparatus 1 according to the third embodiment is different from the ultrasonic sludge concentration measuring apparatus 1 according to the first embodiment in that the repair gate 11 is not provided, and the flow path control valves 48 and 49 and A difference is that a flow path control valve 48b and air pipes 39c, 39d, and 39e are provided in place of the air pipes 39a and 39b. That is, in the ultrasonic sludge concentration measuring apparatus 1 according to Embodiment 3, the repair gate 11 as shown in FIG. 1 is not installed outside the communication port 10 on the side wall of the main pipe unit 2, and the communication port 10 A valve box 3a of the control valve 3 is attached to the outer edge. In addition, a flow path control valve 48b, which is a direct acting solenoid valve composed of a valve box in which five connection ports 481, 482, 483, 484, and 485 are arranged and a valve body that moves directly in the valve box by magnetic force, is provided. Is provided.

  A connection port 483 of the flow path control valve 48b is a connection port dedicated to inflow of compressed air, and is connected to the air tank 39 by an air pipe 39c. The connection port 482 is connected to an air outflow inlet below the cylinder of the drive unit 3b by an air pipe 39d, and the connection port 484 is connected to an air outflow inlet above the cylinder of the drive unit 3b and an air pipe 39e. The connection ports 481 and 485 are in an unconnected open state. The flow path control valve 48b is always located at one of two locations in the valve box by the internal valve body by the magnetic force of an electromagnet or the like and the biasing force of a spring or the like. Due to the space between the valve box and the valve body, two flow paths are always formed at the same time regardless of the position of the valve body. The internal flow path is switched to two patterns depending on the valve body position.

  In the first pattern, a flow path connecting the connection port 483 and the connection port 482 and a flow path connecting the connection port 484 and the connection port 485 are formed simultaneously. As a result, a flow path is formed in which the compressed air in the air tank 39 is sent to the air outflow inlet below the cylinder of the drive unit 3b via the air pipe 39c, the connection port 483, the connection port 482, and the air pipe 39d. A flow path is formed in which air above the piston is discharged to the outside through the air pipe 39e, the connection port 484, and the connection port 485 from the air outflow inlet above the cylinder 3b.

  In the second pattern, a flow path connecting the connection port 483 and the connection port 484 and a flow path connecting the connection port 482 and the connection port 481 are formed simultaneously. As a result, a flow path is formed in which the compressed air in the air tank 39 is sent to the air outflow inlet above the cylinder of the drive unit 3b via the air pipe 39c, the connection port 483, the connection port 484, and the air pipe 39e. A flow path is formed through which air below the piston is discharged to the outside through the air pipe 39d, the connection port 482, and the connection port 481 from the air outflow inlet below the cylinder 3b.

  By applying the flow path control valve 48b having the above structure, the control valve 3 can operate in the same manner as in the first embodiment. Since other configurations are the same as those of the first embodiment, the description thereof is incorporated and detailed description is omitted. The configuration of the third embodiment can be applied to the first and second embodiments, and can also be applied to the later-described fourth to nineteenth embodiments.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 according to the third embodiment, when the control valve 3 needs to be repaired or replaced, the main pipe section 2 is installed during the operation. In the case where the flow of the sludge pipe can be stopped, there is no problem even if the repair gate 11 is not provided. Therefore, the manufacturing cost is reduced by eliminating the repair gate 11, and the repair gate 11 There exists an effect which can aim at reduction of the installation area on the plane for thickness. In addition, by using the flow path control valve 48b, the controller 8 can control the opening and closing of the control valve 3 only by controlling one flow path control valve, so the number of flow path control valves installed can be reduced. It is possible to reduce the number of electrical wirings between the controller 8 and the flow path control valve, to reduce the circuit in the controller 8, and to reduce the manufacturing cost.

Embodiment 4 FIG.
FIG. 6 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to Embodiment 4, and FIG. 7 is a cross-sectional view of the ultrasonic sludge concentration measuring apparatus 1 taken along the line AA. In the ultrasonic sludge concentration measuring apparatus 1 according to the fourth embodiment, a gas discharge pipe 51 is raised above the peripheral wall member 13 of the measurement chamber 4 and the upper end is opened to the atmosphere to form a gas discharge port 52 for discharging a gas reservoir. The point that the discharge control valve 53 that controls the discharge of the gas reservoir is provided in the gas discharge pipe 51 and the point that the protective cover 7 is not provided are different from the ultrasonic sludge concentration measuring apparatus 1 of the first embodiment. The discharge control valve 53 is controlled to be opened and closed by the controller 8. The other configuration is the same as the configuration of the ultrasonic sludge concentration measuring apparatus 1 according to the first embodiment, and thus the description thereof is incorporated and detailed description is omitted.

  The discharge of the gas reservoir is performed by controlling the opening / closing of the discharge control valve 53 by the controller 8, but the timing of opening / closing the discharge control valve 53 may be opened at a predetermined time interval for a predetermined time, for example. However, the valve may be opened when the sludge cannot be sufficiently pressurized due to the gas pool and the ultrasonic transmission / reception failure by the ultrasonic transmitter / receiver is detected. As long as the sludge concentration measurement failure due to sludge pressurization due to gas accumulation does not continue for a long time, any timing may be used, but the discharge control valve 53 is opened when the control valve 3 is closed. Even when the control valve 3 is opened, since the gas can be discharged by the sludge pressure in the main pipe section 2, only the internal pressure of the sludge in the measurement chamber 4 can be used for gas discharge. In addition to this timing, it is preferable to control the controller 8 so that the discharge control valve 53 is opened.

  Further, if the discharge control valve 53 is opened at the time of sludge pressurization, not only the gas in the measurement chamber 4 but also the sludge will be ejected. Therefore, the controller 8 does not open the discharge control valve 53 at this timing. It is necessary to control with. Further, the time for opening the discharge control valve 53 needs to be appropriately adjusted according to the environment in which the main pipe section 2 is installed so that the sludge in the measurement chamber 4 does not jump out from the gas discharge port 52 as much as possible. Further, depending on the environment, the rising height of the gas discharge pipe 51 and the height of the gas discharge port 52 may be increased to prevent sludge from jumping out.

  When the sludge piping connected to the main pipe section 2 pressurizes and transfers the sludge with a pump or the like, the sludge is always in a slightly pressurized state, so the control valve 3 is closed at regular intervals. By opening the discharge control valve 53 for a very short time, the accumulated gas in the measurement chamber 4 can be forcibly discharged from the gas discharge port by the sludge pressure even if it does not reach the total amount, and the measurement chamber 4 There is no risk that the sludge inside will jump out of the gas outlet 52. As the discharge control valve 53, an electromagnetic valve, an electric valve, a pneumatic valve, a hydraulic valve, a water pressure valve or the like can be applied, and any valve can be used as long as it can be controlled by the controller 8. Moreover, in this Embodiment 4, although the edge part of the gas exhaust pipe 51 was made open as the gas exhaust port 52, the gas exhaust pipe 51 was extended and connected to the sludge piping downstream from the main pipe part 2. Then, the gas in the measurement chamber 4 may be transferred to a sludge pipe together with a part of the sludge, or may be transferred to the nearest sludge storage tank, a side groove, or the like. In short, it is sufficient that the gas in the measurement chamber 4 can be discharged to the outside.

  A gas discharge pipe 51 is attached to the upper outer periphery of the measurement chamber 4 shown in the ultrasonic sludge concentration measuring apparatus 1 of the fourth embodiment, and a gas discharge port 52 for discharging gas is provided at the upper end of the gas discharge pipe 51. The configuration in which the discharge control valve 53 is opened and the discharge control valve 53 is provided in the middle portion of the gas discharge pipe 51 and the opening / closing control of the discharge control valve 53 is performed by the controller 8 is not limited to the fourth embodiment. The present invention can also be applied to the ultrasonic sludge concentration measuring apparatuses of Embodiment 3 and Embodiments 5 to 19 described later.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 of the fourth embodiment, this ultrasonic sludge concentration measurement is particularly performed in a sludge pipe through which sludge having a property that sludge gas is easily generated and a gas pool is likely to occur. When the apparatus 1 is installed, the gas pool retained in the upper part of the measurement chamber 4 can be discharged to the outside from the gas discharge port 52 by opening the discharge control valve 53. Therefore, the sludge caused by the gas pool There is an effect of solving the problem that the sludge concentration due to the poor dissolution of bubbles during pressurization and the sludge concentration cannot be measured accurately.

  Furthermore, when the volume of the gas reservoir staying in the measurement chamber 4 is large, when the compressed air is supplied to the pressurizing chamber 6, the gas reservoir, which is a gas having a significantly higher compressibility than the liquid, contracts. There is also an effect that it is possible to prevent the so-called reversal phenomenon in which the elastic member 24 is pushed into the measuring chamber 4 and is deformed.

Embodiment 5. FIG.
FIG. 8 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to the fifth embodiment. The AA line sectional view is the same as FIG. 7 which is the AA line sectional view of the ultrasonic sludge concentration measuring apparatus 1 of the fourth embodiment. The ultrasonic sludge concentration measuring apparatus 1 according to the fifth embodiment is different from the ultrasonic sludge concentration measuring apparatus 1 according to the fourth embodiment, and a gas discharge pipe 54 is set up at the upper part of the pipe wall of the main pipe section 2. The upper end of the gas discharge pipe 54 is opened to the atmosphere to form a gas discharge port 55 for discharging the gas reservoir, and the gas discharge pipe 54 is provided with a discharge control valve 56 for controlling the discharge of the gas reservoir, and the discharge control valve 56 is electrically connected. The difference is that it is connected to the controller 8. Since the other configuration is the same as that of the fourth embodiment, the detailed description is omitted by using the description. The structure and open / close control of the discharge control valve 56 are the same as the open / close control of the discharge control valve 53 of the fourth embodiment, and the gas discharge pipe 54 is the same as the gas discharge pipe 51 of the fourth embodiment. is there.

  The ultrasonic sludge concentration measuring apparatus 1 according to the fifth embodiment has a configuration in which the gas discharge pipe 54 is attached to the upper part of the pipe wall of the main pipe section 2, and this configuration is the first to third embodiments or the sixth to sixth embodiments. The ultrasonic sludge concentration measuring apparatus 1 according to any one of 19 may be applied. Further, the gas exhaust pipe 51 of the fourth embodiment and the gas exhaust pipe 53 of the fifth embodiment may be provided side by side.

  As described above, the ultrasonic sludge concentration measuring apparatus 1 according to the fifth embodiment has the following effects in addition to the effects shown in the fourth embodiment. That is, the inner diameter of the main pipe section 2 is selected according to the sludge flow rate flowing through the sludge pipe in which the ultrasonic flow sludge concentration measuring apparatus 1 is installed, whereas the inner diameter of the measurement chamber 4 is the economical viewpoint. Therefore, it is preferable to have the same inner diameter. The reason for this is that if the inner diameter of the measurement chamber 4 is changed according to the inner diameter of the main pipe section 2, the distance between the two ultrasonic transmitter / receivers 5 a changes, so that adjustment of the converter 30 for each inner diameter is necessary. In other words, the repair gate 11, the control valve 3, the peripheral wall member 13, the elastic member 24, the outer cover member 25, etc. must be prepared for each inner diameter of the measurement chamber 4, leading to a significant increase in manufacturing cost. And so on.

  Here, when the inner diameter of the measurement chamber 4 is always the same inner diameter and the inner diameter of the main pipe portion 2 is larger, the tube axis of the measurement chamber 4 and the pipe axis of the main pipe portion 2 are configured to have the same height. Therefore, the upper end of the inner wall of the main pipe part 2 is higher than the upper end of the inner wall of the measurement chamber 4. For this reason, even if the gas reservoir is discharged from the gas discharge port 52 through the gas discharge pipe 51 from the upper end of the inner wall of the measurement chamber 4, the gas reservoir staying in the main pipe portion 2 is the upper end of the inner wall of the measurement chamber 4. A portion staying from the height position to the upper end of the inner wall of the main pipe portion 2 cannot be discharged and remains. However, in the ultrasonic sludge concentration measuring apparatus 1 according to the fifth embodiment, since the gas pool is discharged from the gas discharge port 55 provided at the upper part of the main pipe section 2, the gas pool retained in the main pipe section 2 is also present. It can be reliably discharged outside.

Embodiment 6 FIG.
FIG. 9 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to the sixth embodiment. The sectional view taken along the line AA is the same as FIG. 7 which is a sectional view taken along the line AA of the ultrasonic sludge concentration measuring apparatus according to the fourth embodiment. The ultrasonic sludge concentration measuring apparatus 1 according to the sixth embodiment is different from the ultrasonic sludge concentration measuring apparatus 1 according to the fourth embodiment in that a pressure measuring device 57 is provided in the gas discharge pipe 51 above the measurement chamber 4. Is different. That is, in the ultrasonic sludge concentration measuring apparatus 1 according to the sixth embodiment, the pressure measuring device 57 is provided in the gas discharge pipe 51 and the detected value of the pressure measuring device 57 is transmitted to the controller 8.

  The control of the discharge control valve 53 for discharging the gas reservoir in the sixth embodiment is almost the same as the control shown in the fourth embodiment, but before the discharge control valve 53 is opened, the pressure measuring device 57 is used. Thus, it is newly added that the pressure in the measurement chamber 4 is measured and the discharge control valve 53 is controlled not to be opened as long as it is in a negative pressure state. Other configurations are the same as the configuration of the ultrasonic sludge concentration measuring apparatus 1 according to the fourth embodiment, and thus detailed description thereof is omitted using the description. The configuration of the sixth embodiment may be applied to the ultrasonic sludge concentration measuring apparatus 1 of any of the first to third embodiments, the fifth embodiment, or the seventh to nineteenth embodiments.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 according to the sixth embodiment, in addition to the effects shown in the fourth embodiment, the discharge control valve 53 is opened so that the gas in the measurement chamber 4 is discharged. Before the discharge control is executed, the pressure in the measurement chamber 4 is measured by the pressure measuring device 57, and the discharge control valve 53 is controlled not to open in the negative pressure state. Due to the negative pressure of the sludge piping due to the cause of this, the discharge control valve 53 is opened when the pressure in the measurement chamber 4 is also negative, and not only the gas cannot be discharged, but also In addition, there is an effect that it is possible to prevent the phenomenon that the outside air is sucked into the measurement chamber 4. The ultrasonic sludge concentration measuring apparatus 1 according to the sixth embodiment is particularly useful when the inside of the installed sludge pipe is in a negative pressure state, for example, when installed in the sludge pipe on the suction side of the transfer pump. effective.

Embodiment 7 FIG.
FIG. 10 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to the seventh embodiment. The sectional view taken along the line AA is the same as FIG. 7 which is a sectional view taken along the line AA of the ultrasonic sludge concentration measuring apparatus according to the fourth embodiment. In the ultrasonic sludge concentration measuring apparatus 1 of FIG. 10, the ultrasonic type of the fifth embodiment (see FIG. 8) is that a pressure measuring device 58 is provided in the gas discharge pipe 54 raised from the main pipe section 2. It differs from the sludge concentration measuring apparatus 1. Other configurations are the same as the configuration of the ultrasonic sludge concentration measuring apparatus 1 according to the fifth embodiment, and thus detailed description thereof is omitted using the description.

  The control of the discharge control valve 56 for discharging the gas reservoir in the seventh embodiment is almost the same as the control shown in the fifth embodiment, but the discharge control valve 56 is opened as in the sixth embodiment. Before the operation, the pressure measuring device 58 measures the pressure in the main pipe section 2 and controls so that the discharge control valve 56 is not opened as long as it is in a negative pressure state. The configuration of the seventh embodiment may be applied to the ultrasonic sludge concentration measuring apparatus 1 according to any of the first to fourth, sixth, or eighth to nineteenth embodiments.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 in the seventh embodiment, in addition to the effects shown in the fifth embodiment, the discharge control valve 56 is opened to allow the gas in the main pipe section 2 to flow. Before executing the discharge control, the pressure measuring device 58 measures the pressure in the main pipe section 2 and controls so that the discharge control valve 56 is not opened in the negative pressure state. Due to the sludge piping being in a negative pressure state due to this cause, the exhaust control valve 56 is opened when the main pipe portion 2 is also in a negative pressure, and not only gas cannot be discharged. On the contrary, there is an effect of preventing the occurrence of a phenomenon in which outside air is sucked into the main pipe section 2. The ultrasonic sludge concentration measuring apparatus 1 according to the seventh embodiment is particularly useful when the inside of the installed sludge pipe may be in a negative pressure state, for example, when installed in the sludge pipe on the suction side of the transfer pump. effective.

Embodiment 8 FIG.
FIG. 11 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to Embodiment 8, and FIG. 12 is a cross-sectional view taken along the line AA. In the ultrasonic sludge concentration measuring apparatus 1 according to the eighth embodiment, an air control valve 59 for opening and closing a flow path is newly provided in an air supply pipe 37 that supplies compressed air from the air tank 39 to the pressurizing chamber 6. However, it is different from the ultrasonic sludge concentration measuring apparatus 1 of the first embodiment. In the ultrasonic sludge concentration measuring apparatus 1 according to the eighth embodiment, an air control valve 59 is provided in the air supply pipe 37 between the flow path switching valve 40 and the pressurizing chamber 6, and the controller 8 is provided with the flow path switching valve. 40 and the air control valve 59 are controlled to be opened and closed.

  That is, in the ultrasonic sludge concentration measuring apparatus 1 according to the first embodiment, only the flow path switching valve 40 is disposed in the air supply pipe 37 between the air tank 39 and the pressurizing chamber 6. The switching valve 40 can constitute only one of a flow path for supplying compressed air from the air tank 39 to the pressurizing chamber 6 and a flow path for releasing the air in the pressurizing chamber 6 to the atmosphere. For this reason, the inside of the pressurization chamber 6 is open | released to air | atmosphere other than the time of the process which pressurizes the sludge of the measurement chamber 4. FIG. However, when the pressure chamber 6 is open to the atmosphere and the inside of the measurement chamber 4 is in a negative pressure state that is equal to or lower than atmospheric pressure, the elastic member 24 is moved from the pressure chamber 6 side to the measurement chamber due to the atmospheric pressure difference from the atmospheric pressure. 4 will be pushed in, and the inversion phenomenon of the elastic member 24 will arise.

  Therefore, the controller 8 of the ultrasonic sludge concentration measuring apparatus 1 according to the eighth embodiment provides a flow path for supplying compressed air from the air tank 39 to the pressurizing chamber 6 during the sludge pressurizing process of the measuring chamber 4. The flow path switching valve 40 is switched and the air control valve 59 is opened. Then, after the pressurization process of the sludge is completed, the flow path switching valve 40 is switched to a flow path that opens the pressurization chamber 6 to the atmosphere, and the compressed air in the pressurization chamber 6 is left with the air control valve 59 kept open. After the pressure chamber 6 is discharged to the atmospheric pressure, the air control valve 59 is closed while the flow path of the flow path switching valve 40 remains unchanged, and the pressure chamber 6 is almost at atmospheric pressure. Control to make it sealed.

  The configuration of the eighth embodiment can be applied to the ultrasonic sludge concentration measuring apparatus 1 of the second to seventh embodiments and the eighth to nineteenth embodiments. Further, in the ultrasonic sludge concentration measuring apparatus 1 according to the eighth embodiment, the air control valve 59 is closed except during the sludge pressurization process, and the pressurizing chamber 6 is a compressive fluid but has an atmospheric pressure. Sealed with air. As long as the inside of the measurement chamber 4 becomes a small positive pressure state, the elastic member 24 is not easily expanded and rubbed against the inner wall of the outer cover member. In the case where the ultrasonic sludge concentration measuring device 1 is disposed in the sludge pipe so that the transferred sludge does not become a large positive pressure state, as shown in the AA line cross-sectional view of FIG. The protective cover 7 for protecting 24 may be unnecessary.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 of the eighth embodiment, even when the inside of the measurement chamber 4 is in a negative pressure state, the inside of the pressurization chamber 6 is in a sealed state so that the inflow / Since there is no outflow, the elastic member 24 is prevented from being pushed into the measurement chamber 4 due to a difference in atmospheric pressure from the atmospheric pressure and causing a reversal phenomenon.

  Further, as described above, when the elastic member 24 is damaged and sludge flows into the pressurizing chamber 6, the leak of the sludge is immediately detected, the control valve 3 is closed, and the drain valve 42 is further turned on. If the sludge in the measuring chamber 4 is not opened and discharged outside the system, the sludge flows into the air supply pipe 37. Except during the sludge pressurization stroke, the flow path switching valve 40 is a flow path in which the pressurizing chamber 6 is opened to the atmosphere, so that sludge flows into the flow path switching valve 40 and the flow path switching valve 40 Sludge flows out of the system through the opening that is not connected to the pipe. In addition, since the air supply pipe 37 has a small diameter, there is a problem that if the sludge flows in, the cleaning operation in the pipe requires labor, and it takes time to recover. However, according to the ultrasonic sludge concentration measuring apparatus 1 of the eighth embodiment, the air control valve 59 is provided in the air supply pipe 37 so that when the leak detector 34 detects sludge leakage, the air control valve When the valve 59 is closed, the inside of the pipe up to the pressurizing chamber 6 and the air control valve 59 can be sealed with air, so that it is possible to prevent the sludge from flowing into the air supply pipe 37.

Embodiment 9 FIG.
FIG. 13 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to Embodiment 9, and FIG. 14 is a cross-sectional view taken along the line AA. FIG. 15 is a cross-sectional view of the outer cover member 25 portion taken along the line AA, and FIG. 16 is a side view of the outer cover member 25 portion seen from the BB line direction. The ultrasonic sludge concentration measuring apparatus 1 from the ninth embodiment to the eleventh embodiment to be described later shows an embodiment in which the outer covering member 25 can be divided. The ultrasonic sludge concentration measuring apparatus 1 according to the ninth embodiment is formed by dividing the outer cover member 25 of the ultrasonic sludge concentration measuring apparatus 1 according to the first embodiment into a pressurizing unit 66 and an electrode storage unit 63. The pressurizing part 66 and the electrode storage part 63 are different from each other in that the housing joint 60 is connected.

  The electrode housing portion 63 of the ninth embodiment can be removed from the pressurizing portion 66 by loosening the fastening bolts 65a and nuts 65b joining the upper and lower housings 60a and 60b of the housing joint 60. Yes. The electrode storage part 63 is rotatable around a connection axis with the pressure part 66. A pressurizing chamber side connection port 68 having a flange portion 68a is formed at a portion of the hemispherical pressurizing portion 66 on the electrode housing portion 63 side.

  A cylindrical communication port 67 is formed inside the pressurizing chamber side connection port 68. A storage portion side connection port 69 having a flange portion 69 a is formed at a portion of the electrode storage portion 63 on the pressure portion 66 side. A communication port 70 is formed inside the storage unit side connection port 69. The flanges 68a and 69a of the pressurizing chamber side connection port 68 and the storage unit side connection port 69 are circular with the same shape and the same size, and the fitting tube portion 71 which is the outside projects from the end surface of the pressurization chamber side connection port 68. A fitting cylinder portion 72 is formed on the inner end surface of the storage portion side connection port 69. A fitting cylinder portion 72 is fitted inside the fitting cylinder portion 71, and a sealing material 73 made of an O-ring or the like is fitted on the outer periphery of the fitting cylinder portion 71. The sealing material 73 is formed by flange portions 68a and 68b. It is sandwiched and the flange portions 68a and 68b are held down by the housings 60a and 60b, so that the electrode housing portion 63 is rotatable around the connection shaft while maintaining a watertight state.

  Each of the housings 60a and 60b of the housing joint 60 has a shape in which flange portions 64 are formed at both ends of the semicircular portion. The pair of housings 60a and 60b are connected to the pressurizing chamber side connection port 68 and the storage portion side. The connection port 69 is formed so as to cover the flanges 68a and 69a. The flange portions 64 of the pair of housings 60a and 60b are overlapped with each other and fastened with bolts 65a and nuts 65b.

  The air inflow port 63 a is provided with an opening 630 in the electrode housing 63, and a cylindrical portion 631 is formed on the outer periphery of the opening 630 with a male screw on the outer side. A cylindrical sealing material is formed on the inner side of the cylindrical portion 631. 63b is inserted, and a lid 63c provided with an internal thread provided with an opening 630c communicating with the opening 630 of the electrode housing 63 is screwed with an external thread of the cylindrical part 631, and a convex part provided inside the lid 63c. The sealing material 63b is pressed toward the electrode housing part 63 by 631c. Then, by inserting the air supply pipe 37 from the opening 630c of the lid 63c and pushing it into the cylinder of the sealing material 63b, the end opening of the air supply pipe 37 that supplies compressed air and the opening 630 of the electrode storage section 63 Can be connected in an airtight state. If the air supply pipe 37 is too tight when being pushed into the cylinder of the sealing material 63b, the air supply pipe 37 can be easily pushed by rotating the lid 63c in the loosening direction to loosen the pressure on the sealing material 63b. . On the other hand, if the airtight state cannot be maintained due to being too loose, the airtight state between the air supply pipe 37 and the electrode storage unit 63 is increased by rotating the lid 63c in the tightening direction to increase the pressure on the sealing material 63b. Can be secured.

  In addition, about the structure of the air inflow port 63a in this Embodiment 9, the same structure is applied also to the air inflow port 32a in all the other embodiments. However, the air inlets 32a and 63a are not limited to this configuration, and any configuration can be used as long as the air supply pipe 37 and the openings 630 of the electrode storage portions 32 and 63 can be connected in an airtight state. Also good. Further, instead of the housing joint 60 used in the ninth embodiment, the flange portions 64 on one end side of the pair of housings have a hinge structure, and only the flange portions 64 on the other end side are fastened with fastening bolts 65a and nuts 65b. A housing joint adapted to be fastened may be applied. Since other configurations are the same as those of the ultrasonic sludge concentration measuring apparatus 1 of the first embodiment, detailed description thereof will be omitted using the description of the first embodiment.

  As in the ultrasonic sludge concentration measuring apparatus 1 according to the ninth embodiment, the outer cover member 25 is divided into the pressurizing unit 66 and the electrode storage unit 63, and the two are coupled by the housing joint 60. The present invention can also be applied to the ultrasonic sludge concentration measuring apparatus 1 according to the first to eighth embodiments or the twelfth to nineteenth embodiments. Further, in the case where the ultrasonic sludge concentration measuring device 1 is disposed in the sludge pipe so that the transferred sludge does not become a large positive pressure state, as shown in the AA line cross-sectional view of FIG. The protective cover 7 that protects the elastic member 24 may be unnecessary.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 in the ninth embodiment, the outer cover member 25 is divided into the pressurizing part 66 and the electrode storage part 63, and both are connected by the housing joint 60. Since it is configured, in order to perform maintenance such as cleaning of the measurement chamber 4 and replacement of the elastic member 24, the through bolt 27 is loosened with a tool such as a spanner and the outer covering member 25 is moved to the peripheral wall member 13 of the measurement chamber 4. When it is difficult to perform the work by removing the electrode housing part 63, the electrode housing part 63 is removed from the pressurizing part 66, or the electrode housing part 63 is rotated clockwise around the connection axis in FIG. Or by rotating counterclockwise, it becomes easy to perform work, and there is an effect that work efficiency can be improved.

  In addition, since the electrode housing part 63 is configured to be rotatable around a connecting shaft with the pressurizing part 66, it can be easily performed on site according to the surrounding environment where the ultrasonic sludge concentration measuring apparatus 1 is installed. There is also an effect that the direction in which the electrode housing part 63 protrudes can be changed.

Embodiment 10 FIG.
Also in the ultrasonic sludge concentration measuring apparatus 1 of the tenth embodiment, the outer covering member 25 is divided and formed as in the ninth embodiment, and the front view is substantially the same as the front view of FIG. The AA line cross-sectional view has substantially the same configuration as the AA line cross-sectional view of FIG. However, as shown in FIGS. 17 and 18, the configuration of the outer cover member 25 is significantly different from the outer cover member 25 of the ninth embodiment. 17 and 18 are a cross-sectional view of the outer covering member 25 in the ultrasonic sludge concentration measuring apparatus 1 according to the tenth embodiment, taken along the line AA and a side view as seen from the BB line direction. The tenth embodiment is similar to the ninth embodiment in that the outer cover member 25 is divided into a pressurizing portion 66 and an electrode storage portion 63 and the structure of the pressurization portion 66 and the electrode storage portion 63 is the same. However, it is different from the ninth embodiment in that both of them are sandwiched by clips 74 and connected.

  FIG. 19 shows a perspective view of the clip 74. The clip 74 is entirely made of metal, and semicircular half rings 74b and 74c are arranged at both ends of the U-shaped cross section on the front side of the projecting portion 74a bent into a U-shaped cross section, A pair of ring shapes are formed by the half rings 74b and 74c on the front side of the protrusion 74a, and a ring shape is also formed on the rear side of the protrusion 74a by the two half rings 74b and 74c. The upper ends of the half rings 74b arranged on the left side of the U-shaped cross section on the front side and the rear side are connected by a connecting member 74d, and the upper ends of the half rings 74c are similarly connected by a connecting member 74e. The connecting member 74d and the connecting member 74e are processed into a shape that opens upward, and an opening 77 is formed between the half rings 74b, and similarly between the half rings 74c. Opening 77 is shaped And it has a configuration. In the above description, for convenience of explaining the structure of the clip 74, the protrusion 74a, the half rings 74b and 74c, and the connecting members 74d and 74e are expressed as if they were separate members. Of course, the clip 74 may be configured by connecting different members by welding or the like, but it is more durable to integrally form a single metal plate by punching, bending and bending, This is preferable because the manufacturing cost is low.

  Further, as the material of the clip 74, it is desirable that the material itself has a certain degree of elasticity and has high corrosion resistance. In terms of corrosion resistance, there are materials having very high corrosion resistance such as titanium, but they are very expensive. Stainless steel is optimal when considering the cost. In addition, as long as elasticity can be secured for a long period of time, a plastic that can be easily integrally molded is also applicable. By adopting such a configuration of the clip 74, the connecting members 74d, 74e can be pushed away in the direction in which they are separated, and the object to be sandwiched can be inserted therefrom. Further, since the clip is formed with a U-shaped projecting portion 74a at the lower end and the clip 74 itself is formed of an elastic metal, the connecting members 74d and 74e are once pushed away in the direction of separating. However, the urging force acts in the direction in which the connecting members 74d and 74e are closed.

In the tenth embodiment, the electrode storage portion 63 and the pressurizing portion 66 are connected using the clip 74 instead of the housing joint 60 shown in the ninth embodiment, and the connection work is performed according to the following procedure.
(1) As in the case of the ninth embodiment, the pressurizing chamber side connection port 68 and the storage unit side connection port 69 are connected.
(2) At this time, a three-layer flange is formed by the flange portion 68a, the sealing material 73, and the flange portion 69a.
(3) The connecting members 74d and 74e of the clip 74 are pushed and expanded and inserted into the ring of the clip 74, and the three-layer flanges are fitted into the openings 77 on both sides.
(4) When the expansion of the connecting members 74d and 74e is stopped, the connecting members 74d and 74e approach again due to the urging force of the clip 74 itself, and the half rings 74b and 74c sandwich the three layers of flanges to store the electrodes. The part 63 and the pressurizing part 66 are connected in an airtight state.

  Thereby, the pressurization part 66 and the electrode storage part 63 are connected, and a coupling | bonding state is maintained. Since the other configuration is the same as that of the ultrasonic sludge concentration measuring apparatus 1 of the first embodiment, the description is used and the detailed description is omitted. After the pressurization part 66 and the electrode storage part 63 are connected, both ends 74d and 74e of the ring part 74a may be further fastened with bolts and nuts (not shown) to further strengthen the coupling.

  In the ultrasonic sludge concentration measuring apparatus 1 according to the tenth embodiment, the outer cover member 25 is divided into a pressurizing unit 66 and an electrode storage unit 63, and the two are coupled by a clip 74. The present invention can also be applied to the ultrasonic sludge concentration measuring apparatus 1 according to the eighth embodiment or the twelfth to nineteenth embodiments. Further, in the case where the ultrasonic sludge concentration measuring device 1 is disposed in the sludge pipe so that the transferred sludge does not become a large positive pressure state, as shown in the AA line cross-sectional view of FIG. The protective cover 7 that protects the elastic member 24 may be unnecessary.

  As described above, according to the ultrasonic sludge concentration measuring apparatus of the tenth embodiment, when separating the pressurizing unit 66 and the electrode storage unit 63, the both end portions 74d and 74e of the clip 74 are spread and pulled. Thus, the clip 74 can be removed, and the electrode storage portion 63 can be easily removed from the pressurizing portion 66. The other various effects shown in the ninth embodiment can be obtained in the same manner.

Embodiment 11 FIG.
Also in the ultrasonic sludge concentration measuring apparatus 1 according to the eleventh embodiment, the outer cover member is divided and formed in the same manner as in the ninth embodiment, and the front view has substantially the same configuration as the front view of FIG. Yes, the cross-sectional view taken along the line AA has substantially the same configuration as the cross-sectional view taken along the line AA in FIG. However, as shown in FIGS. 20 and 21, the configuration of the outer cover member 25 is significantly different from that of the ninth embodiment. 20 and 21 are a cross-sectional view of the outer cover member 25 in the ultrasonic sludge concentration measuring apparatus 1 according to the eleventh embodiment taken along the line AA and a side view as seen from the BB line direction. In the eleventh embodiment, as in the ninth and tenth embodiments, the outer cover member 25 is divided and formed by the pressurizing portion 78 and the electrode housing portion 79. This is different from the ninth and tenth embodiments in that it is fixed.

  In the eleventh embodiment, the connection port 87 of the electrode storage unit 79 is mounted outside the connection port 85 on the pressure unit 78 side. The connector 80 is provided in a cylindrical connection port 87 on the electrode housing part 79 side. The connection port 85 of the pressure unit 78 is the side where the connector 80 is inserted, and an engagement groove 83 that holds the locking ball 82 is provided on the outer periphery of the connection port 85 of the pressure unit 78. The locking ball 82 is a ball that is inserted into a boundary portion between the connection port 85 and the connection port 87 to lock the connection state between the two. The locking balls 82 are disposed in ball holding holes 82 a opened at several places (for example, four places) around the connection port 87 of the electrode housing portion 79. The ball holding hole 82a passes through the thick wall of the connection port 87, and is a through hole having a mortar-like shape in which the diameter on the bottom side is smaller than the diameter of the locking ball 82 and the diameter on the sleeve 81 side is large. Yes. A projection 81a formed on the inner wall surface of the sleeve 81 and facing the engagement groove 83 pushes the locking ball 82 into the bottom of the engagement groove 83, so that the connection ports 85 and 87 are connected to each other. The connection state is locked (fixed). The protruding portion 81 a of the sleeve 81 is located at a position where the engaging groove 83 faces when the sleeve 81 is pressed by the spring 84 and is in contact with the locking ring 86. The connection ports 85 and 87 are in a locked state because the locking balls 82 are present in the ball holding holes 82 a and the locking grooves 83, so that they do not slip out of each other. When the connection ports 85 and 87 are in the connected state, the displacement of the connection ports 85 and 87 in the axial direction is locked, but the engagement ball 82 can move in the ring-shaped engagement groove 83. Therefore, the connection ports 85 and 87 are connected so as to be relatively rotatable in the direction around the connection axis.

  A locking ring 86 is attached to the outer periphery of the distal end portion of the connection port 87 on the electrode housing portion 79 side. The locking ring 86 is made of a metal plate from which a part of the circular ring is cut, and presses the protruding portion 81a of the sleeve 81 so that the sleeve 81 does not come off from the connection port 87 by a biasing force of a spring 84 described later. A step portion is formed inside the connection port 87, and a sealing material 88 made of an O-ring is disposed on the step portion. When the connection ports 85 and 87 are in a connected state, the sealing material 88 is in close contact with the sealing material 88 at the end of the connection port 85, whereby the connection port 85 and the connection port 87 are in an airtight state. In addition, the communication port 89 of the connection port 85 and the communication port 90 of the connection port 87 are in a communication state. One end of a spring 84 made of a coil spring having a biasing force in the spreading direction is supported on the corner 91 of the connection port 87, and the other end of the spring 84 abuts against and contacts the side surface of the protrusion 81 a of the connector 80. Yes.

  The sleeve 81 is elastically biased toward the pressurizing portion 78 by a spring 84. When the sleeve 81 is moved toward the electrode housing portion 79 so as to compress the spring 84, the projection 81a stops pushing the locking ball 82, and the locking ball 82 can be detached from the engagement groove 83, and the connection is made. The mouths 85 and 87 can be separated. That is, when removing the electrode storage portion 79 from the pressurizing portion 78, the projection 81a is separated from the locking ball 82 by pulling the sleeve 81 toward the electrode storage portion 79 against the biasing force of the spring 84. Since the ball 82 becomes free and the pull-out preventing function of the connection ports 85 and 87 is eliminated, the electrode housing part 79 can be easily removed from the connection port 85 by pulling. In the eleventh embodiment, the connector 80 is configured to connect the connection port 85 of the pressurizing unit 78 and the connection port 87 of the electrode storage unit 79, and as in the case of the ninth embodiment, the electrode storage unit 79 includes: It can be rotated around an axis connected to the pressure unit 78. Since other configurations are the same as those of the ultrasonic sludge concentration measuring apparatus 1 of the first embodiment, the description thereof is incorporated and detailed description is omitted.

  The structure shown in the ultrasonic sludge concentration measuring apparatus 1 according to the eleventh embodiment is configured such that the outer cover member 25 is divided into a pressurizing part 78 and an electrode storage part 79, and both are connected by a connector 80. The present invention can also be applied in combination with the ultrasonic sludge concentration measuring apparatus 1 of the first to eighth embodiments or the twelfth to nineteenth embodiments. Further, in the case where the ultrasonic sludge concentration measuring device 1 is disposed in the sludge pipe so that the transferred sludge does not become a large positive pressure state, as shown in the AA line cross-sectional view of FIG. The protective cover 7 that protects the elastic member 24 may be unnecessary.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 of the eleventh embodiment, there is an effect similar to the effect described in the ninth embodiment, and the connector 80 is connected from the pressurizing unit 78 to the electrode housing unit. Even when detaching 79, since it does not come off from the electrode storage part 79, there is an effect that there is no possibility of losing parts.

Embodiment 12 FIG.
FIG. 22 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to the twelfth embodiment. The AA line sectional view is substantially the same as FIG. 2 which is an AA line sectional view of the ultrasonic sludge concentration measuring apparatus 1 of the first embodiment except that the air dryer 138 is provided. Incorporate. The ultrasonic sludge concentration measuring apparatus 1 according to the twelfth embodiment is provided with an air dryer 138 between the air compressor 38 and the air tank 39 as compared with the ultrasonic sludge concentration measuring apparatus 1 according to the first embodiment. There is a feature in being done. Since the other configuration is the same as that of the ultrasonic sludge concentration measuring apparatus of the first embodiment, the point that the air dryer 138 is provided will be described, and the description of the other configuration will be based on that of the eighth embodiment.

  Generally, the surrounding environment where the ultrasonic sludge concentration measuring apparatus 1 is installed includes a water tank, an open water channel, and the like, and is an atmosphere having a relatively high humidity (a large amount of moisture in the air). Since the air compressor 38 takes in the surrounding air and compresses it, it inevitably becomes compressed air with a large amount of moisture. Then, during the sludge pressurization process, this compressed air with a large amount of steam is sent to the pressurizing chamber 6. Since the sludge flows in the ultrasonic sludge concentration measuring device 1, the temperature is lower than the ambient temperature especially in summer when the outside air temperature is high, and the air in the pressurizing chamber 6 has a large amount of moisture. The saturated vapor pressure is reached, and condensation occurs in the pressurized chamber. A leak detector 34 is installed in the pressurizing chamber 6, and when condensed water that has accumulated in the pressurizing chamber 6 accumulates, the condensed water is connected to the leak detector 34 and the outer cover member 25. Electrical conduction is made, current flows in the detection circuit in the control panel, and the elastic member 24 may be damaged and it may be erroneously detected that sludge has leaked, which has been a problem.

  Therefore, in the ultrasonic sludge concentration measuring apparatus 1 according to the twelfth embodiment, an air dryer 138 for drying the compressed air is provided. The air dryer 138 includes, for example, a device that warms air with an electric heater and a device that dries with a moisture absorbent. The configuration in which the air dryer 138 is provided in the pipe between the air compressor 38 and the air tank 39 as in the ultrasonic sludge concentration measuring apparatus 1 of the twelfth embodiment is not limited to the twelfth embodiment but the first to the second embodiments. The present invention can also be applied to the ultrasonic sludge concentration measuring apparatus 1 up to the eleventh embodiment or the ultrasonic sludge concentration measuring apparatus 1 according to the thirteenth to nineteenth embodiments. Further, in the case where the ultrasonic sludge concentration measuring device 1 is disposed in the sludge pipe so that the transferred sludge does not become a large positive pressure state, as shown in the AA line cross-sectional view of FIG. The protective cover 7 that protects the elastic member 24 may be unnecessary.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 of the twelfth embodiment, in addition to the effects of the first embodiment, the amount of moisture in the air in the pressurizing chamber 6 is reduced, and the condensed water is reduced. Since it does not accumulate, it is possible to prevent the leak detector 35 from malfunctioning.

Embodiment 13 FIG.
FIG. 23 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to the thirteenth embodiment. The AA line cross-sectional view is generally the same as FIG. 2, which is a cross-sectional view of the ultrasonic sludge concentration measuring apparatus 1 according to the first embodiment, taken along line AA. In the ultrasonic sludge concentration measuring apparatus 1 according to the thirteenth embodiment, a water supply pipe 93 is connected to the measurement chamber 4, a water supply control valve 94 is provided in the water supply pipe 93, and a drain control valve 95 is provided in the drain pipe 43. The water supply control valve 94 and the drain control valve 95 are controlled to be opened and closed by the controller 8 so that the inner wall of the measurement chamber 4 and the transmission / reception surface of the ultrasonic transmitter / receiver 5a can be automatically cleaned regularly. This is different from the ultrasonic sludge concentration measuring apparatus 1 of the first embodiment.

  The water supply pipe 93 is connected to a pipe connection port provided in the peripheral wall member 13, and supplies cleaning water into the measurement chamber 4. In addition to the water supply control valve 94 that is controlled to be opened and closed by the controller 8, the water supply pipe 93 is provided with an open / close valve 92 that is manually opened and closed and used during maintenance of the water supply control valve 94. The on-off valve 92 and the drain valve 42 are normally open, and are closed when the water supply control valve 94 and the drain control valve 95 are maintained. Since the drain drain port 41 is provided below the measurement chamber 4, it is desirable that the water supply pipe 93 is connected by providing a pipe connection port above the measurement chamber 4 and above the peripheral wall member 13.

The cleaning process of the measurement chamber 4 according to the thirteenth embodiment is a single process (after the control valve 3 is closed, the water supply control valve 94 and the drain control valve 95 are opened to clean the measurement chamber 4. After the cleaning is completed, The water supply control valve 94 and the drain control valve 95 may be closed, and the control valve 3 may be opened.) However, it is more efficient to perform this in combination with the sludge concentration measurement process. The process when combined is shown below. Other configurations of the ultrasonic sludge concentration measuring apparatus 1 and the sludge concentration measuring method using the ultrasonic transmitter / receiver 5 are the same as those in the first embodiment, and detailed descriptions thereof are omitted.
(1) Open the control valve 3 and introduce sludge into the measurement chamber 4 from the main pipe 2.
(2) The control valve 3 is closed to shut off the measurement chamber 4 from the main pipe section 2, and the sludge is sealed in the measurement chamber 4.
(3) The flow path switching valve 40 is switched to a flow path connecting the air tank 39 and the pressurizing chamber 6. At this time, the compressed air flows into the pressurizing chamber 6 and pushes the elastic member 24 to the inside of the measuring chamber 4 to pressurize the sludge in the measuring chamber 4.
(4) The sludge concentration is measured by the ultrasonic transmitter / receiver 5 after elapse of time sufficient for the bubbles in the sludge in the measurement chamber 4 to disappear.
(5) The flow path switching valve 40 is switched to a flow path in which the pressurizing chamber 6 is opened to the atmosphere, and the compressed air in the pressurizing chamber 6 is discharged out of the system.
(6) The drain control valve 95 is opened and the sludge in the measurement chamber 4 is discharged outside the system under natural flow.
(7) The water supply control valve 94 is opened, and cleaning water is supplied into the measurement chamber 4 to wash the inside of the measurement chamber 4 (the drain control valve 95 remains open at this time as well, Drain out of the system.)
(8) The drain control valve 95 is closed, and the measurement chamber 4 is filled with washing water.
(9) The water supply control valve 94 is closed after the measurement chamber 4 is filled with washing water. Until the next sludge concentration measurement process is started, the inside of the measurement chamber 4 is filled with washing water.

  In the above process, the cleaning process is performed every time the sludge concentration is measured. However, the cleaning process may be performed after a predetermined number of processes of measuring the sludge concentration. Further, depending on the properties of the sludge, such as high sludge viscosity, the sludge may not flow smoothly from the main pipe section 2 even if the control valve 3 is opened during the sludge concentration measurement process. In such a case, the sludge can be forced to flow into the measurement chamber 4 by opening the drain control valve 95 for a predetermined time to drain the sludge or washing water in the measurement chamber 4.

  The configuration and cleaning method of the ultrasonic sludge concentration measuring apparatus 1 according to the thirteenth embodiment can also be applied to the ultrasonic sludge concentration measuring apparatus 1 according to the second to twelfth embodiments or the fifteenth embodiment. Further, in the case where the ultrasonic sludge concentration measuring device 1 is disposed in the sludge pipe so that the transferred sludge does not become a large positive pressure state, as shown in the AA line cross-sectional view of FIG. The protective cover 7 that protects the elastic member 24 may be unnecessary.

  As described above, according to the ultrasonic sludge concentration measuring apparatus of the thirteenth embodiment, in addition to being able to obtain the effects of the first embodiment, the inside of the measurement chamber 4 and the ultrasonic transceiver as time passes. The sludge adhering to the transmission / reception surface 5a has an effect of preventing the sludge from adhering to it and leaving it unremovable.

Embodiment 14 FIG.
FIG. 24 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to the fourteenth embodiment. The ultrasonic sludge concentration measuring apparatus 1 according to the fourteenth embodiment is configured such that a pressure measuring device 96 is provided in the drain pipe 43 and the pressure in the measurement chamber 4 to which the drain pipe 43 is connected is measured. However, it is different from the ultrasonic sludge concentration measuring apparatus 1 of the thirteenth embodiment.

  That is, in the thirteenth embodiment, as a method for forcibly allowing the sludge to flow into the measurement chamber 4, it has been proposed to open the drain control valve 95 with the control valve 3 opened. In many cases, the end opposite to the end connected to the chamber 4 is open to an open water channel (such as a side groove) or a water tank in an open state. When the drain control valve 95 is opened while the inside of the sludge pipe in which the ultrasonic sludge concentration measuring apparatus 1 is installed is in a negative pressure state, air is sucked into the measurement chamber 4 from the opening of the drain pipe 43. Therefore, the sludge pressurization process may be hindered.

  Therefore, the ultrasonic sludge concentration measuring apparatus 1 according to the fourteenth embodiment measures the pressure in the measurement chamber 4 by installing the pressure measuring device 96 in the drain pipe 43 on the measurement chamber 4 side from the installation position of the drain control valve 95. The measured value of the pressure measuring device 96 is sent to the controller 8. When the drain control valve 95 is opened to discharge the sludge in the measurement chamber 4, the pressure in the measurement chamber 4 is measured by the pressure measuring device 96, and when the pressure is positive, the drain control is performed. Although the valve 95 is opened, the controller 8 is controlled so that the drain control valve 95 is not opened when the pressure is negative. Since other configurations are the same as those of the thirteenth embodiment, the description is used and the detailed description is omitted. Note that the installation place of the pressure measuring device 96 is not limited as long as the pressure in the measurement chamber 4 can be measured. For example, a connection port may be newly provided in the peripheral wall member 13 and the pressure measuring device 96 may be installed. Alternatively, the pressure measuring device 96 may be installed in the water supply pipe 93 on the measurement chamber 4 side from the water supply control valve. Or the gas outlet 45 may be installed. The configuration and cleaning method of the ultrasonic sludge concentration measuring apparatus 1 according to the fourteenth embodiment can also be applied to the ultrasonic sludge concentration measuring apparatus 1 according to the second to twelfth or fifteenth embodiments.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 of the fourteenth embodiment, in addition to the effects shown in the thirteenth embodiment, the pressure measuring device 96 is disposed in the drain pipe 43. When the inside of the measurement chamber 4 is in a negative pressure state, it can be controlled by the controller 8 so as not to perform the process of forcibly introducing the sludge, and the effect of preventing the sludge pressurizing process from being hindered. There is.

Embodiment 15 FIG.
FIG. 25 is a cross-sectional view taken along line AA of the ultrasonic sludge concentration measuring apparatus 1 according to the fifteenth embodiment. The front view is substantially the same as FIG. 1 which is a front view of the ultrasonic sludge concentration measuring apparatus 1 of the first embodiment. The ultrasonic sludge concentration measuring apparatus 1 according to the fifteenth embodiment is provided with an ultrasonic oscillator 97 in the measurement chamber 4 for cleaning the inner wall of the measurement chamber 4 and the transmission / reception surface of the ultrasonic transmitter / receiver 5a with ultrasonic waves. This is different from the ultrasonic sludge concentration measuring apparatus 1 of the fourth embodiment. Generally, the frequency of ultrasonic waves used for ultrasonic cleaning is low. On the other hand, as is the case with the present invention, in general, the frequency of ultrasonic waves used for measuring sludge concentration by ultrasonic waves is higher than that of ultrasonic cleaning. Therefore, the sludge adhering in the measurement chamber 4 cannot be removed by the ultrasonic waves transmitted from the ultrasonic transmitter / receiver 5a. Therefore, in the ultrasonic sludge concentration measuring apparatus 1 according to the fifteenth embodiment, an ultrasonic wave having a frequency lower than the ultrasonic frequency transmitted from the ultrasonic transceiver 5a and suitable for ultrasonic cleaning can be irradiated. A sound wave oscillator 97 is installed through the peripheral wall member 13. The ultrasonic oscillator 97 can oscillate low-frequency ultrasonic waves for cleaning under the control of the controller 8. Other configurations are the same as the configuration of the ultrasonic sludge concentration measuring apparatus 1 according to the first embodiment, and thus detailed description thereof is omitted.

  In addition, in the case where an ultrasonic transmitter / receiver 5a that can oscillate both an ultrasonic wave having a frequency suitable for sludge concentration measurement and an ultrasonic wave having a frequency suitable for ultrasonic cleaning is applied, the ultrasonic wave You may use it by switching the oscillation frequency of the ultrasonic transmitter-receiver 5a, without installing the oscillator 97. FIG. In the ultrasonic sludge concentration measuring apparatus 1 according to the fifteenth embodiment, the configuration in which the ultrasonic oscillator 97 for cleaning is installed inside the measurement chamber 4 is the ultrasonic sludge concentration from the second embodiment to the nineteenth embodiment. It can be applied to the measuring device 1. Further, in the case where the ultrasonic sludge concentration measuring device 1 is disposed in the sludge pipe so that the transferred sludge does not become a large positive pressure state, as shown in the AA line cross-sectional view of FIG. The protective cover 7 that protects the elastic member 24 may be unnecessary.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 of the fifteenth embodiment, in addition to obtaining the effects of the first embodiment, the ultrasonic oscillator 97 generates ultrasonic waves in the measurement chamber 4. Is transmitted at predetermined time intervals to prevent sludge from adhering to the measurement chamber 4 and the transmission / reception surface of the ultrasonic transmitter / receiver 97, and the time interval of the cleaning process can be extended, or other than during regular maintenance This eliminates the need for a cleaning step, greatly reduces the amount of cleaning water, and has the effect of reducing the running cost for maintenance.

Embodiment 16 FIG.
FIG. 26 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to the sixteenth embodiment. The AA line cross-sectional view is generally the same as FIG. 2, which is a cross-sectional view of the ultrasonic sludge concentration measuring apparatus 1 according to the first embodiment, taken along line AA. The ultrasonic sludge concentration measuring apparatus 1 of the sixteenth embodiment is different from that of the thirteenth embodiment in that the end of the drain pipe 43 opposite to the end connected to the measurement chamber 4 is an ultrasonic sludge. It is connected to the sludge pipe 98 on the downstream side of the installation location of the concentration measuring device 1, and the sludge and washing water flowing into the drain pipe 43 are forcibly sent to the downstream sludge pipe 98 by the transfer means 99. This is different from the ultrasonic sludge concentration measuring apparatus 1 of the thirteenth embodiment. Other configurations are the same as the configuration of the ultrasonic sludge concentration measuring apparatus 1 according to the thirteenth embodiment, and thus detailed description thereof is omitted.

  That is, as the transfer means 99 of the ultrasonic sludge concentration measuring apparatus 1 according to the sixteenth embodiment, a pressure pump such as a line pump (spiral pump), a tube pump, or a diaphragm pump can be applied, but the example shown in FIG. Then, the tube pump 100 with a strong suction force is used. The tube pump 100 is elastic and has a small cylindrical tube 101 made of a resin, a roller group 102 composed of a plurality of rollers and rotatable about a mounting center axis, and the roller group 102. A support wall member 103 capable of flattening the tube 101, a drive source (not shown) such as a motor that rotates the roller group 102, and a casing 104 in which these are provided. The motor that rotates the roller group 102 is controlled by the controller 8. An on-off valve 105 is disposed on the downstream side of the drain pipe 43. The on-off valve 105 is normally opened and is closed during maintenance of the tube pump, and prevents sludge from flowing out of the system from the sludge pipe 98. Since other configurations are the same as those of the ultrasonic sludge concentration measuring apparatus 1 according to the thirteenth embodiment, detailed description thereof will be omitted using the description. The configuration of the ultrasonic sludge concentration measuring apparatus 1 according to the sixteenth embodiment is also applicable to the other first to fifteenth embodiments. Further, in the case where the ultrasonic sludge concentration measuring device 1 is disposed in the sludge pipe so that the transferred sludge does not become a large positive pressure state, as shown in the AA line cross-sectional view of FIG. The protective cover 7 that protects the elastic member 24 may be unnecessary.

  In the ultrasonic sludge concentration measuring apparatus 1 according to the sixteenth embodiment, when the roller group 102 rotates, the cylindrical tube 101 is pressed flat by the roller group 102 and the support wall member 103, and the built-in material is pushed downstream. It is. Therefore, when the roller group 102 starts to rotate with the sludge in the drain pipe 43, the cylindrical tube 101 is crushed and the sludge is transferred to the downstream side, and sent to the downstream sludge pipe 98. Since the tube pump 100 directly compresses and flattens the cylindrical tube 101 and pushes the contents downstream, it is possible to reliably and strongly convey sludge. In addition, the tube pump is extremely excellent in corrosion resistance because movable parts such as the roller group 102 do not come into direct contact with sludge. However, as the cylindrical tube 101 deteriorates with the passage of time of use, it needs to be replaced periodically.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 of the sixteenth embodiment, in addition to the effects shown in the thirteenth embodiment, it is not necessary to discharge sludge and washing water out of the system. It is possible to solve the problem of odor generated when sludge and washing water are drained into the side groove or the like and the poor appearance due to the sludge being seen in the side groove.

Embodiment 17. FIG.
FIG. 27 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to the seventeenth embodiment. The AA line cross-sectional view is generally the same as FIG. 2, which is a cross-sectional view of the ultrasonic sludge concentration measuring apparatus 1 according to the first embodiment, taken along line AA. In the ultrasonic sludge concentration measuring apparatus 1 according to the seventeenth embodiment, a drain discharge port 41 for discharging sludge from the measurement chamber 4 is provided above the measurement chamber 4, that is, above the peripheral wall member 31, and a drain pipe 43 is connected. The difference from the sixteenth embodiment is that the sludge is taken out from the upper part of the measurement chamber 4 and forcedly fed to the sludge pipe 98 on the downstream side. Similarly to the drain pipe 43 of the sixteenth embodiment, the drain pipe 43 is provided with a tube pump 100 as a transfer means 99, a drain valve 42, a drain control valve 95, and an on-off valve 105. Since the configuration of the tube pump 100, the drain valve 42, the drain control valve 95, and the on-off valve 105 is the same as that of the sixteenth embodiment, the description thereof will be used. Other configurations are the same as those of the thirteenth embodiment, and thus detailed description thereof is omitted. The configuration of the ultrasonic sludge concentration measuring apparatus 1 according to the seventeenth embodiment can be applied to the other first to fifteenth embodiments. Further, in the case where the ultrasonic sludge concentration measuring device 1 is disposed in the sludge pipe so that the transferred sludge does not become a large positive pressure state, as shown in the AA line cross-sectional view of FIG. The protective cover 7 that protects the elastic member 24 may be unnecessary.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 of the seventeenth embodiment, sludge can be strongly discharged from the measurement chamber 4 using the tube pump 100 as the transfer means 99, and sludge and washing water can be discharged. In addition to the effects of the sixteenth embodiment, which can prevent discharge outside the system and the deterioration of the appearance, when the sludge is forcibly pumped from the measurement chamber 4 to the sludge pipe 98, the inside of the measurement chamber 4 There is an effect peculiar to the embodiment 17 that the gas reservoir staying in the upper part can be simultaneously pumped, and the problem of the sludge pressurization process caused by the gas reservoir can be solved.

Embodiment 18 FIG.
FIG. 28 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to the eighteenth embodiment. The AA line cross-sectional view is generally the same as FIG. 2, which is a cross-sectional view of the ultrasonic sludge concentration measuring apparatus 1 according to the first embodiment, taken along line AA. The ultrasonic sludge concentration measuring apparatus 1 according to the eighteenth embodiment is different from the ultrasonic sludge concentration measuring apparatus 1 according to the sixteenth embodiment in that the transfer means 99 is a piston pump 106 that is operated by air pressure. That is, the piston pump 106 is disposed on the downstream side of the drain control valve 95 connected to the lower part of the measurement chamber 4. The piston pump 106 includes a drain chamber 107, a drain piston 108, an air chamber 109, an air piston 110, a connecting shaft 111, air pipes 112 and 113, and flow path switching valves 114 and 115. The air pipes 112 and 113 are connected to the air tank 39 so that compressed air can be supplied to the air chambers 109 before and after the air piston 110. The air piston 110 disposed in the air chamber 109 can reciprocate in the longitudinal direction in the air chamber 109 by opening / closing control of the flow path switching valves 114 and 115. The air piston 110 is connected to the drain piston 108 via the connecting shaft 111, and the reciprocating motion of the air piston 110 is transmitted to the drain piston 108 so that the sludge is carried into and out of the drain chamber 107. Has been.

  When one of the switching valves 114 and 115 is a channel for introducing the compressed air of the air tank 39 into the air chamber 109, the other switching valve is a channel for opening the air in the air chamber 109 to the atmosphere. Yes. That is, when the sludge is sucked from the measurement chamber 4 to the drain chamber 107 by the drain piston 108, the flow path switching valve 114 takes a flow path that opens to the atmosphere, while the flow path switching valve 115 allows the compressed air in the air tank 39 to flow into the air chamber. The flow path introduced into 109 is taken. As a result, the air piston 110 moves to the left in FIG. 28 and introduces sludge from the measurement chamber 4 into the drain chamber 107. Needless to say, at this time, the drain control valve 95 is open and the discharge control valve 116 is closed. When the sludge is introduced into the drain chamber 107, the drain control valve 95 is closed and the discharge control valve 116 is opened. Then, the flow path switching valve 115 is released to the atmosphere, and the flow path switching valve 114 is connected to the air tank 39. As a result, the air piston 110 moves to the right side in FIG. 28, the connecting shaft 111 moves the drain piston 108 to the right side in FIG. 28, and the sludge is discharged from the drain chamber 107 to the drain pipe 43 on the discharge control valve 116 side. Then, the sludge is forcibly pumped to the sludge pipe 98 on the downstream side of the ultrasonic sludge concentration measuring apparatus 1. Since other configurations are the same as those of the sixteenth embodiment, detailed description thereof is omitted using the description.

  The ultrasonic sludge concentration measuring apparatus 1 according to the eighteenth embodiment uses an air piston 110 and a drain piston 108 as sludge transfer means in the measurement chamber 4 and uses compressed air in an air tank 39 as a power source. However, such a configuration may be configured so as to be conveyed over the main pipe section 2 and the sludge pipe 98 as in the seventeenth embodiment.

  The configuration of the ultrasonic sludge concentration measuring apparatus 1 according to the eighteenth embodiment can also be applied to the ultrasonic sludge concentration measuring apparatus 1 according to the second to fifteenth embodiments. Further, in the case where the ultrasonic sludge concentration measuring device 1 is disposed in the sludge pipe so that the transferred sludge does not become a large positive pressure state, as shown in the AA line cross-sectional view of FIG. The protective cover 7 that protects the elastic member 24 may be unnecessary.

  As described above, according to the ultrasonic sludge concentration measuring apparatus 1 of the eighteenth embodiment, in addition to the effects of the sixteenth embodiment, the transfer means is the piston pump 106 that operates with the air pressure from the air tank 39. As a result, the pumping pump using the ordinary electric motor shown in the seventeenth embodiment requires a large amount of electric power, whereas only the air in the flow path switching valves 114 and 115 and the air tank 39 is required, so that the operating cost is reduced. Has the effect of low cost.

Embodiment 19. FIG.
FIG. 29 is a front view of the ultrasonic sludge concentration measuring apparatus 1 according to the nineteenth embodiment. The AA line cross-sectional view is generally the same as FIG. 2, which is a cross-sectional view of the ultrasonic sludge concentration measuring apparatus 1 according to the first embodiment, taken along line AA. In the ultrasonic sludge concentration measuring apparatus 1 according to the nineteenth embodiment, the transfer means 99 for transferring the sludge in the measurement chamber 4 is constituted by an air lift 117, which is the closest to the ultrasonic sludge concentration measuring apparatus 1. When there is a water tank (not shown) capable of storing sludge and cleaning water such as a sludge storage tank, the sludge and cleaning water of the measurement chamber 4 flowing into the drain pipe 43 is used to supply the water tank using the air lift 117. The difference from Embodiment 16 is that it can be transferred. Since other configurations are the same as those of the sixteenth embodiment, detailed description thereof will be omitted by using the description.

  In the ultrasonic sludge concentration measuring apparatus 1 shown in FIG. 29, the air lift 117 has a discharge nozzle 120 installed at the bottom of a cylinder constituting the pumping chamber 119, and compressed air is supplied from the discharge nozzle 120 to the pumping chamber 119. It can be ejected upward in the room. A water pipe 121 is connected to the upper part of the pumping chamber 119, and a drain pipe 43 is connected to the lower part of the side wall of the pumping chamber 119. An air pipe 122 extending from the air tank 39 is connected to the discharge nozzle 120, and an air supply valve 123 is provided in the air pipe 122. The air supply valve 123 is opened and closed under the control of the controller 8.

  In the ultrasonic sludge concentration measuring apparatus according to the nineteenth embodiment, when the sludge in the measurement chamber 4 is sent to the water tank via the pumping chamber 119, the drain control valve 95 and the air control valve 123 are opened under the control of the controller 8. It is. As a result, sludge and washing water flow into the pumping chamber 119 from the measurement chamber 4 via the drain pipe 43 and are filled with sludge and washing water. At this time, if the compressed air in the air tank 39 is ejected from the discharge nozzle 120 in the pumping chamber 119, buoyancy is generated when the compressed air rises in sludge or washing water. Due to this buoyancy, sludge and washing water rise in the water pipe 121 against gravity and are transferred to the water tank.

  In the ultrasonic sludge concentration measuring apparatus 1 according to the nineteenth embodiment, in addition to the effects of the sixteenth embodiment, a transfer means 99 for discharging the sludge in the measurement chamber 4 from the measurement chamber 4 is provided in the drain pipe 43. The air lift 117 is provided, and the compressed air of the air tank 39 is used as a power source for transferring the air lift 117. Since the air lift 117 is generally constituted by piping, there is little failure and the installation space can be reduced. Moreover, it is not necessary to install a motor for driving the pump, and the operation cost can be kept low.

  The ultrasonic sludge concentration measuring apparatus 1 according to the nineteenth embodiment can be configured in combination with the ultrasonic sludge concentration measuring apparatus 1 according to the second to fifteenth embodiments. Further, in the case where the ultrasonic sludge concentration measuring device 1 is disposed in the sludge pipe so that the transferred sludge does not become a large positive pressure state, as shown in the AA line cross-sectional view of FIG. The protective cover 7 that protects the elastic member 24 may be unnecessary.

Sludge transfer system using ultrasonic sludge concentration measuring device 1.
FIG. 30 shows a sludge transfer system using the ultrasonic sludge concentration measuring apparatus 1 according to any one of the first to nineteenth embodiments. FIG. 31 is a cross-sectional view of the sludge transfer system of FIG. 30 as seen from the CC line direction. The sludge system of FIG. 30 shows an example of a sludge transfer system when the sludge stored in the sludge storage tank 124 is transferred to another water tank or the like by the transfer pump 125. As shown in FIG. 30, in this sludge transfer system, a header pipe 126 is assembled in order to transfer sludge by a plurality of transfer pumps 125, and a flange 126a is provided on the header pipe 126 to provide a plurality of branch portions. A sludge suction pipe 127 is connected to each branch portion by a flange 126a and a flange 127a, and a transfer pump 125 is connected to each other end. The ultrasonic sludge concentration measuring apparatus 1 is disposed closer to the sludge storage tank 124 than the branch portion to which the sludge suction pipe 127 of the header pipe 126 is connected. The upstream end of the header pipe 126 is connected to a sludge outflow pipe 130 at the bottom of the side wall of the water tank 124. A vent 124 a is provided at the ceiling of the sludge storage tank 124 to allow the inside of the storage tank 124 to communicate with the atmosphere.

Even when the transfer pump 125 is not operated, the sludge flows into the header pipe 126 from the sludge storage tank 124 with the hydraulic head pressure, and the header pipe 126 is filled with sludge. . However, if the state where the transfer pump 125 is not operated continues, gas is generated in the sludge, and as shown in the sectional view in the CC line direction of the header pipe 26 in FIG. 141 stays. When the transfer pump 125 is operated in this state, a strong suction force is generated in the sludge suction pipe 127, and even if the gas reservoir 141 is somewhat retained in the sludge suction pipe 127, There is no problem because it is pumped. However, since the sludge suction pipe 127, which is a branch pipe from the header pipe 126, has a smaller diameter than the header pipe 126, there is a difference in height between the upper end of the inner wall of the sludge suction pipe 127 and the upper end of the inner wall of the header pipe 126. There is. Once the gas reservoir 141 stays there, when the transfer pump 125 is stopped, even if there is a pushing pressure from the sludge storage tank 124, it is higher than the upper end of the inner wall of the sludge suction pipe 127 (sludge in FIG. 31). The gas reservoir 141 (above the boundary surface 142) cannot move to the sludge suction pipe 127 side. In addition, even when the transfer pump 125 is in operation, if the suction force of the transfer pump 125 is stronger than the head pressure of the sludge storage tank 124, the header pipe 126 is in a negative pressure state, and the sludge 140 is more than the gas reservoir 141. The gas is not sucked preferentially, and the gas reservoir 141 is left behind and stays there for a long time.
In this state, the gas reservoir 141 is also retained in the ultrasonic sludge concentration measuring apparatus 1 having the main pipe portion 2 having the same diameter as the header tube 126, and the gas reservoir 141 is retained in the measurement chamber 4. If it flows in, a malfunction will generate | occur | produce in the sludge pressurization process of the ultrasonic-type sludge density | concentration measuring apparatus 1. FIG.

  Therefore, in an example of this sludge transfer system, the header portion (large diameter portion) of the header pipe 126 is extended in the coaxial direction by piping, and a gas discharge port portion 128 having a flange 128a is provided on the extended piping, The gas discharge pipe 129 is connected to the gas discharge port portion 128 by the flange 128a and the flange 129a, and is raised to a position above the highest sludge water level surface of the nearest sludge storage tank 124 and connected to the sludge storage tank 124. It is configured.

  That is, in the sludge transfer system of FIG. 30, a sludge outflow pipe 130 is provided at the lower portion of the side wall of the sludge storage tank 124, a header pipe 126 is connected to the sludge outflow pipe 130, and an ultrasonic sludge concentration measuring device is connected to the header pipe 126. 1 is connected to the sludge suction pipe 127, and the sludge suction pipe 127 is provided with a transfer pump 125 for transferring the sludge to another system, and the header pipe 126 is disposed on the opposite side of the connection portion of the sludge storage tank 124. A gas discharge port portion 128 is formed in the upper wall portion of the extended portion, a gas discharge pipe 129 extending upward is connected to the gas discharge port portion 128, and an upper end portion of the gas discharge tube 129 is connected. Is connected to a portion of the sludge storage tank 124 that is equal to or higher than the upper limit position of the sludge water level.

  As described above, according to this sludge transfer system, when the transfer pump 125 is stopped, the sludge in the sludge storage tank 124 is caused by the head pressure due to the sludge in the sludge storage tank 124 when the transfer pump 125 is stopped. The gas reservoir 141 pushed out into the header pipe 126 and staying in the header pipe 126 is pushed out to the gas discharge port 128 and returned to the sludge storage tank 124 via the gas discharge pipe 129. Even after all the gas reservoir 141 is pushed out, the sludge 140 rises in the gas discharge pipe 129 from the gas discharge port 128, but stops without rising above the sludge water level in the sludge storage tank 124. In addition, even when the transfer pump 125 is operating, the difference between the suction pressure (negative pressure) of the transfer pump 125 and the pushing pressure (positive pressure) due to the water head pressure from the sludge storage tank 124 should not be too large. By designing, the sludge 140 in the header pipe 126 can be returned from the gas discharge pipe 129 to the sludge storage tank 124 without being in an extremely positive pressure state or a negative pressure state. And sludge gas is not sucked. Therefore, the sludge concentration can be accurately measured by the ultrasonic sludge concentration measuring device 1, and the sludge can be transferred to the downstream system constantly.

Application example of ultrasonic sludge concentration measuring device.
32 is a front view of an application example of the ultrasonic sludge concentration measuring apparatus 1 according to the thirteenth embodiment, and FIG. 33 is a cross-sectional view taken along the line AA of FIG. The ultrasonic sludge concentration measuring apparatus 1 shown in FIGS. 32 and 33 removes the elastic member 24 and the outer covering member 25 from the ultrasonic sludge concentration measuring apparatus 1 shown in the thirteenth embodiment, and Instead, a flange lid 133 (see FIG. 33) is attached to the opening 23 of the measurement chamber 4 with a bolt 131 via a sealing material 135, and a manual measurement chamber opening / closing valve 132 is installed instead of the control valve 3. Further, the water supply control valve 94 is removed from the water supply pipe 93, and only the manual opening / closing valve 92 is provided, and the drain control valve 95 is removed from the drain pipe 43. Furthermore, the configuration in which compressed air supply related devices such as the air supply pipe 37, the air tank 39, and the air compressor 38 are removed is significantly different from the ultrasonic sludge concentration measuring apparatus 1 of the thirteenth embodiment.

  As shown in FIGS. 32 and 33, this ultrasonic sludge concentration measuring apparatus does not pressurize the sludge for measuring the sludge concentration, and passes from the sludge pipe to the main section 2, the communication port 10, and the measurement chamber 4. The ultrasonic transmitter / receiver 5 transmits / receives ultrasonic waves to the flowing sludge to measure the sludge concentration. In addition, the measurement chamber opening / closing valve 132 is normally opened, but the measurement chamber 4 can be separated from the sludge flow path in the main pipe section 2 by closing the manual measurement chamber opening / closing valve 132. In addition, maintenance work such as replacement of parts in the measurement chamber 4 (such as the ultrasonic transmitter / receiver 5a) can be performed without stopping the flow of the sludge pipe and without providing a separate bypass pipe. When cleaning the measurement chamber 4 or the like, the measurement chamber opening / closing valve 132 is manually closed to disconnect the sludge flow path from the main pipe section 2 and the opening / closing valve 92 is manually opened to supply cleaning water to the measurement chamber 4. The inside of the measurement chamber 4 can be cleaned by introducing it, manually opening the drain valve 42, and draining the sludge and cleaning water in the measurement chamber 4 to the drain pipe 43. Further, even when the valve function of the measurement chamber opening / closing valve 132 is lowered, the measurement chamber opening / closing valve 132 can be replaced without closing the flow of the sludge pipe by closing the repair gate 11.

In the ultrasonic sludge concentration measuring apparatus according to this application example, the gas discharge pipe 51 and the discharge control valve 53 of the fourth embodiment shown in FIG. 6 and the gas discharge pipe 54 and the discharge control valve of the fifth embodiment shown in FIG. 56, the pressure measuring device 57 of the sixth embodiment shown in FIG. 9, the pressure measuring device 58 of the seventh embodiment shown in FIG. 10, the ultrasonic oscillator 97 of the fifteenth embodiment shown in FIG. Moreover, you may combine the structure of Embodiment 16-19 which transfers the sludge in the measurement chamber 4 to a downstream sludge piping.

It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 1 of this invention. It is an AA line sectional view of Embodiment 1 of FIG. It is the sectional view on the AA line of the ultrasonic sludge density | concentration measuring apparatus of Embodiment 2 of this invention. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 3 of this invention. It is the sectional view on the AA line of Embodiment 4 of FIG. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 4 of this invention. It is an AA line sectional view of Embodiment 4 of FIG. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 5 of this invention. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 6 of this invention. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 7 of this invention. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 8 of this invention. It is AA sectional view taken on the line of Embodiment 8 of FIG. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 9 of this invention. It is AA sectional view taken on the line of Embodiment 9 of FIG. It is AA sectional view taken on the line of the outer covering member of Embodiment 9 of this invention. It is the side view seen from the BB line direction of the outer covering member of Embodiment 9 of FIG. It is AA sectional view taken on the line of the outer covering member of Embodiment 10 of this invention. It is the side view seen from the BB line direction of the outer covering member of Embodiment 10 of FIG. It is a perspective view of the clip of Embodiment 10 of FIG. It is AA sectional view taken on the line of the outer covering member of Embodiment 11 of this invention. It is the side view seen from the BB line direction of the outer covering member of Embodiment 11 of FIG. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 12 of this invention. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 13 of this invention. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 14 of this invention. It is the sectional view on the AA line of the ultrasonic sludge density | concentration measuring apparatus of Embodiment 15 of this invention. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 16 of this invention. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 17 of this invention. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 18 of this invention. It is a front view which shows the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 19 of this invention. It is a schematic diagram which shows an example of the sludge transfer system which applied the ultrasonic type sludge density | concentration measuring apparatus of Embodiment 1 thru | or 19 of this invention. It is CC sectional view taken on the line which shows the water level difference of the header pipe | tube and sludge suction pipe in the sludge transfer system of FIG. It is a front view of the application example of the ultrasonic type sludge density | concentration measuring apparatus which opens and closes a measurement chamber on-off valve manually. It is AA sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ultrasonic-type sludge density | concentration measuring apparatus 2 Main pipe part 3 Control valve 4 Measurement chamber 5 Ultrasonic transmitter / receiver 5a Ultrasonic transmitter / receiver 6 Pressurization chamber 7 Protective cover 8 Controller 10 Communication port 13 Perimeter wall member 11 Repair gate 16a, 16b Sludge inlet 17 Protruding part 23 Opening 24 Elastic member 25 Outer member 27 Fixing bolt 29 Communication port 30 Converter 31 Pressurizing part 32 Electrode storage part 32a Air inlet 33 Air circulation hole 34 Leakage detector 35 Terminal storage box 37 Air Supply pipe 38 Air compressor 39 Air tank 40 Flow path switching valve 41 Drain drain port 42 Drain valve 43 Drain pipe 44 Closure lid 45 Gas discharge port 48 Flow path control valve 49 Flow path control valve 50 Notch 51, 54 Gas discharge pipe 52 , 55 Gas discharge port 53, 56 Discharge control valve 57, 58 Pressure measuring device 59 Air control valve 60 Housing joint 63 Electrode storage part 63a, 79a Air inlet 630, 790 Opening 631, 791 Tube part 63b, 79b Sealing material 63c, 79c Lid 630c, 790c Opening 631c, 791c Convex part 66 Pressurization part 74 Clip 93 Water supply pipe 94 Water supply control valve 95 Drain control valve 96 Pressure measuring device 97 Ultrasonic oscillator 99 Transfer means 100 Tube pump 106 Piston pump 116 Discharge control valve 117 Air lift

Claims (5)

A communication port is provided in the main section where sludge flows.
A measurement chamber is arranged at the communication port via a control valve,
Close the control valve and pressurize the sludge in the measurement chamber with pressurizing means,
In the ultrasonic sludge concentration measuring apparatus for measuring the amount of attenuation by transmitting and receiving ultrasonic waves to and from the sludge by the ultrasonic transmitter / receiver provided in the measurement chamber, and calculating the sludge concentration from the amount of attenuation,
An elastic member covering an opening provided in the measurement chamber;
An outer covering member that covers the outside of the elastic member and forms a pressurizing chamber;
An ultrasonic sludge concentration measuring apparatus comprising: a protective cover that covers the elastic member on the pressurizing chamber side. 2. The ultrasonic sludge concentration measuring apparatus according to claim 1, wherein the protective cover has air circulation holes. A communication port is provided in the main section where sludge flows.
A measurement chamber is arranged at the communication port via a control valve,
Close the control valve and pressurize the sludge in the measurement chamber with pressurizing means,
In the ultrasonic sludge concentration measuring apparatus for measuring the amount of attenuation by transmitting and receiving ultrasonic waves to and from the sludge by the ultrasonic transmitter / receiver provided in the measurement chamber, and calculating the sludge concentration from the amount of attenuation,
An elastic member covering an opening provided in the measurement chamber;
An outer covering member that covers the outside of the elastic member and forms a pressurizing chamber;
An ultrasonic sludge concentration measuring apparatus comprising a gas discharge port and a discharge control valve provided at an upper portion of a main pipe part and / or a measurement chamber. The pressurizing means is
The ultrasonic sludge concentration measuring apparatus according to any one of claims 1 to 3, wherein the ultrasonic sludge concentration measuring apparatus is an air supply pipe provided with an air control valve for supplying compressed air from an air supply source to a pressurizing chamber. The ultrasonic sludge concentration measuring apparatus according to any one of claims 1 to 4, wherein the outer covering member is separable.

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