JP2011191200A - Washing device of component detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the washing device of a component detector capable of washing a sensor immersed in sewage without using power, facilitating maintenance and management, and accurately measuring the dissolved component in sewage in real time. <P>SOLUTION: The washing device is adapted to the component detector (7) including a sensor holder (8) of which the leading end (8a) is immersed in the flowing sewage and the sensor (10) provided to the leading end (8a) of the sensor holder (8) to detect the dissolved component in the sewage. The washing device is equipped with the cylindrical fixing part (13) fixed to the sensor holder (8); the movable part (14) mounted on the outer peripheral surface of the fixing part (13) so as to be immersed in the sewage and receiving the flow of the sewage to reciprocally move in the axial direction of the fixing part (13); and the washing body (15) brought into contact with the outer peripheral surface of the leading end (8a) of the sensor holder (8) containing the sensor (10) in a slidable manner. The washing body (15) reciprocatively moves along the outer peripheral surface of the leading end (8a) of the sensor holder (8) so as to follow the movement of the movable part (14). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cleaning device applied to, for example, a component detector that detects dissolved oxygen in sewage, and more particularly to a structure for cleaning a sensor unit of a component detector that is constantly immersed in sewage without power.

  Sewage containing pollutants such as sewage discharged from households or factory effluent is subjected to water purification by a treatment device using an activated sludge method. In the activated sludge method, the amount of oxygen dissolved in the sewage is measured in order to keep the amount of oxygen necessary for microorganisms to decompose organic matter.

  Since the dissolved oxygen meter for measuring the dissolved oxygen in the sewage is always immersed in the sewage, it cannot be denied that the pollutant contained in the sewage adheres to the sensor. For this reason, a sensor part gets dirty early and it becomes difficult to measure an exact amount of oxygen.

  In order to prevent the sensor unit from being contaminated, conventionally, as disclosed in Patent Document 1, for example, the sensor unit immersed in the sewage is sprayed with pressurized water or air to forcibly clean the sensor unit. To be done.

JP 52-132891 A

  The conventional cleaning method using water or air requires a dedicated power source such as a pump for pressurizing water or air, as well as a nozzle for injecting water or air, or between the nozzle and pump. It requires a number of accessories such as piping to connect and pressure regulating valves.

  For this reason, it is inevitable that the configuration of the apparatus for cleaning the sensor unit is complicated, which causes a high cost, and there is a problem that maintenance and management for maintaining the cleaning performance are required.

  Furthermore, in the cleaning method in which pressurized air is blown onto the sensor unit, excess oxygen contained in the air is supplied to the sensor unit, so the DO value indicating the amount of oxygen in the sewage becomes high. As a result, during the period of cleaning the sensor unit, the amount of oxygen in the sewage cannot be accurately measured, and at least 30 minutes until the DO value returns to a normal value indicating the amount of oxygen in the original sewage. Requires some time.

  Therefore, it is difficult to measure the actual amount of oxygen in the sewage in real time, and there is a problem that the amount of oxygen that activates microorganisms is hindered from being kept appropriate.

  The object of the present invention is that the sensor part immersed in the sewage can be washed without power using the flow of sewage, and maintenance and management become easy, and the dissolved components in the actual sewage are real-time. The object is to obtain a cleaning device for a component detector that can be measured accurately.

In order to achieve the above object, a cleaning apparatus according to one aspect of the present invention includes:
The present invention is applied to a component detector including a sensor holder having a tip part immersed in flowing sewage and a sensor part provided at the tip part of the sensor holder for detecting dissolved components in the sewage.
The cleaning device has a cylindrical fixed portion fixed to the sensor holder, and a movable portion that is mounted on the outer peripheral surface of the fixed portion so as to be immersed in sewage and reciprocates in the axial direction of the fixed portion under the flow of sewage And a cleaning body that slidably contacts the outer peripheral surface of the tip end portion of the sensor holder including the sensor portion. The cleaning body reciprocates along the outer peripheral surface of the front end portion of the sensor holder following the movement of the movable portion.

  According to the present invention, the cleaning body reciprocates according to the flow of sewage to forcibly scrape off dirt adhering to the outer peripheral surface of the tip of the sensor holder. For this reason, not only a dedicated power source such as a pump or a motor becomes unnecessary, but also nozzles and piping for injecting water and air can be omitted. Therefore, the configuration of the cleaning device can be simplified to reduce the cost, and the cleaning device can be easily maintained and managed.

  Furthermore, since excess oxygen in the air does not need to be supplied to the sensor unit, dissolved components in the sewage can be accurately measured even during the cleaning of the sensor unit.

The side view which shows roughly the sewage purification processing apparatus to which the oxygen activated sludge method which concerns on the 1st Embodiment of this invention is applied. Sectional drawing of the washing | cleaning apparatus which concerns on the 1st Embodiment of this invention. In the first embodiment of the present invention, the cleaning device showing a state in which the movable portion has moved from the first position to the second position. Sectional drawing which follows the F4-F4 line | wire of FIG. The front view seen from the direction of the F5-F5 line of FIG. Sectional drawing of the washing | cleaning apparatus which concerns on the 2nd Embodiment of this invention. Sectional drawing of the washing | cleaning apparatus which concerns on the 3rd Embodiment of this invention.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows an example of a sewage purification treatment apparatus 1 to which an oxygen activated sludge method is applied. The sewage purification treatment apparatus 1 includes a sealed treatment tank 2 into which, for example, sewage discharged from a home or factory effluent is introduced. The processing tank 2 has a main body 2a and an upper lid 2b that seals the open end of the main body 2a. The level A of the sewage introduced into the treatment tank 2 is located below the upper lid 2b. A space S between the liquid level A of the sewage and the upper lid 2 b is connected to the oxygen generator 4 via the oxygen supply pipe 3. In the present embodiment, the oxygen generator 4 supplies oxygen having a purity of, for example, 90% to the space S of the treatment tank 2.

  High-purity oxygen supplied to the space S dissolves into the sewage from the liquid level A. Thereby, the microorganisms in the treatment tank 2 are activated, and the polluted substances in the sewage are propagated as feed, thereby purifying the sewage. The oxygen-activated sludge method that activates microorganisms using high-purity oxygen has several times the amount of sewage treated per unit time compared to the standard activated sludge method, and purifies sewage efficiently in a short time. be able to. Furthermore, according to the sewage purification treatment apparatus 1 employing the oxygen activated sludge method, the sewage introduced into the treatment tank 2 flows in the direction indicated by the arrow B in FIG.

  As shown in FIG. 1, a protective cylinder 5 is attached to the upper lid 2 b of the processing tank 2. The protective cylinder 5 passes through the upper lid 2b and is guided into the main body 2a. The protective cylinder 5 stands vertically with respect to the treatment tank 2 and its lower end opening is immersed in the sewage.

  A dissolved oxygen meter 7 for detecting dissolved oxygen in the sewage is inserted inside the protective cylinder 5. The dissolved oxygen meter 7 is an example of a component detector that detects dissolved components dissolved in sewage, and includes a sensor holder 8 and a sensor unit 9.

  The sensor holder 8 has a straight cylindrical shape and is erected vertically. The front end portion 8a located at the lower end of the sensor holder 8 is opened downward and is immersed in sewage.

  The sensor unit 9 is accommodated inside the front end 8 a of the sensor holder 8. The sensor unit 9 includes a sensor unit 10 that measures dissolved oxygen in sewage. The sensor unit 10 is exposed from the front end 8a of the sensor holder 8 to the inside of the processing tank 2, and is always immersed in sewage. The sensor unit 10 emits an electrical signal corresponding to the measured oxygen concentration. The electrical signal of the sensor unit 10 is sent to an instruction device 11 provided outside the processing tank 2 through a lead wire (not shown) connected to the sensor unit 10. The lead wire is led out of the processing tank 2 through the inside of the sensor holder 8.

  As shown in FIGS. 2 to 5, a cleaning device 12 is attached to the sensor holder 8 of the dissolved oxygen meter 7. The cleaning device 12 is for cleaning the tip 8 a of the sensor holder 8 having the sensor unit 10, and includes a fixed unit 13, a movable unit 14, and a cleaning ring 15.

  The fixing portion 12 has a hollow cylindrical shape, and is fixed coaxially to the outer peripheral surface of the sensor holder 8. In the present embodiment, the front end portion 8a of the sensor holder 8 protrudes downward from the fixed portion 13, and the lower end of the fixed portion 12 is lowered by the stopper ring 16 fixed to the upper end of the front end portion 8a of the sensor holder 8. Supported by Further, a spring receiver 17 is fixed to the upper end of the fixing portion 12. The spring receiver 17 projects outward in the radial direction from the outer peripheral surface of the fixed portion 12.

  The movable portion 14 includes a main body 18 and a plurality of blades 19. The main body 18 has a hollow cylindrical shape, and the total length of the main body 18 is shorter than the total length of the fixed portion 12. The main body 18 is mounted coaxially on the outer peripheral surface of the fixed portion 13, can rotate in the circumferential direction of the fixed portion 13, and can move in the axial direction of the fixed portion 13.

  The blades 19 are integrally formed on the outer peripheral surface of the main body 18. The blades 19 are arranged at intervals in the circumferential direction of the main body 18 and project radially from the main body 19 so as to receive the flow of sewage. Therefore, the movable part 14 rotates in the circumferential direction of the fixed part 13 in the sewage so as to follow the flow of the sewage.

  As shown in FIGS. 2 and 4, a conversion mechanism 21 that converts the rotational motion of the movable portion 14 into a reciprocating linear motion along the axial direction of the fixed portion 13 is disposed between the fixed portion 13 and the movable portion 14. Yes. The conversion mechanism 21 includes a guide groove 22 formed on the outer peripheral surface of the fixed portion 13 and a sphere 23 held on the inner peripheral surface of the movable portion 14.

  The guide groove 22 includes a spiral portion 24 and a straight portion 25. The spiral portion 24 goes around the outer peripheral surface of the fixed portion 13 and has a start end 24a and a terminal end 24b. The start end 24 a is located at the lower end of the fixed portion 13 and is adjacent to the tip end portion 8 a of the sensor holder 8. The end 24b is separated from the starting end 24a in the axial direction of the fixed portion 13, and is positioned above the starting end 24a.

  The straight line portion 25 extends in the axial direction of the fixed portion 13 so as to connect the start end 24 a and the end end 24 b of the spiral portion 24. Furthermore, the linear portion 25 is inclined at a predetermined angle α in the rotational direction of the movable portion 14 with respect to the center line O1 of the movable portion 14, and this angle α is preferably about 5 °.

  The spherical body 23 is rotatably held in a recess 26 formed on the inner peripheral surface of the main body 18 of the movable portion 14. The spherical body 23 protrudes from the inner peripheral surface of the main body 18 and is rotatably fitted in the guide groove 22.

  For this reason, when the movable part 14 receives the flow of sewage and rotates, the sphere 23 moves along the spiral part 24 of the guide groove 22. Thereby, the movable portion 14 moves in the axial direction of the fixed portion 13 while rotating in the circumferential direction of the fixed portion 13.

  That is, the movable portion 14 can reciprocate in the axial direction of the fixed portion 13 between a first position corresponding to the start end 24 a of the spiral portion 24 and a second position corresponding to the end 24 b of the spiral portion 24. It has become.

  FIG. 2 discloses a state in which the movable portion 14 has been moved to the first position. In the first position, the sphere 23 is guided to the start end 24 a of the spiral portion 24, and the lower end of the movable portion 14 abuts against the stopper ring 16. FIG. 3 discloses a state in which the movable portion 14 has been moved to the second position. In the second position, the sphere 23 is guided to the terminal end 24 b of the spiral portion 24, and the movable portion 14 is positioned between the stopper ring 16 and the spring receiver 17.

  According to the present embodiment, the compression coil spring 28 is installed between the spring receiver 17 of the fixed portion 13 and the upper end of the movable portion 14. The compression coil spring 28 always elastically biases the movable portion 14 toward the first position.

  Thereby, when the movable part 14 moves from the first position toward the second position as the movable part 14 rotates, the compression coil spring 28 is gradually compressed. When the movable portion 14 reaches the second position, the compression of the compression coil spring 28 is released, and the compression coil spring 28 extends at a stretch. Therefore, the sphere 23 moves along the straight portion 25 of the guide groove 22, and the movable portion 14 descends vigorously from the second position toward the first position.

  The cleaning ring 15 is an example of a cleaning body, and is formed of, for example, a synthetic resin material that is more flexible than the sensor holder 8. The cleaning ring 15 continuously surrounds the distal end portion 8a of the sensor holder 8 in the circumferential direction, and slidably contacts the outer peripheral surface of the distal end portion 8a.

  The cleaning ring 15 is connected to the lower end of the main body 18 of the movable portion 14 through support stays 29a and 29b at two locations facing each other in the radial direction. Therefore, the cleaning ring 15 reciprocates in the axial direction of the distal end portion 8 a while rotating on the outer peripheral surface of the distal end portion 8 a of the sensor holder 8 following the movement of the movable portion 14.

  Specifically, in a state where the movable portion 14 has reached the first position, the cleaning ring 15 is moved to the lower end of the outer peripheral surface of the tip portion 8 a of the sensor holder 8 and is positioned around the sensor portion 10. . Further, when the movable portion 14 has reached the second position, the cleaning ring 15 is positioned at the upper end of the outer peripheral surface of the tip portion 8 a of the sensor holder 8.

  Next, the operation of the cleaning device 12 will be described.

  As shown in FIG. 1, the cleaning device 12 is immersed in sewage flowing in the direction of arrow B in the treatment tank 2. Since the movable part 14 of the cleaning device 12 has the blades 19 that receive the flow of sewage, the movable part 14 rotates while being immersed in the sewage. The spherical body 23 moves along the spiral portion 24 of the guide groove 22 by the rotation of the movable portion 14.

  As a result, the movable portion 14 moves in the axial direction of the fixed portion 13 from the first position toward the second position against the urging force of the compression coil spring 28. At the same time, the cleaning ring 15 connected to the movable portion 14 rises while rotating from the lower end of the outer peripheral surface of the tip portion 8 a of the sensor holder 8.

  When the sphere 23 of the movable portion 14 reaches the end 24b of the spiral portion 24, the compression amount of the compression coil spring 28 becomes maximum. For this reason, when the sphere 23 moves from the terminal end 24b of the spiral portion 24 to the straight portion 25 as the movable portion 14 rotates, the movable portion 14 is directed from the second position to the first position by the urging force of the compression coil spring 28. Is forced down. At the same time, the cleaning ring 15 connected to the movable portion 14 descends vigorously from the upper end to the lower end of the outer peripheral surface of the tip 8 a of the sensor holder 8.

  According to such a cleaning device 12, the cleaning ring 15 reciprocates in the axial direction of the tip 8a while rotating in the circumferential direction of the tip 8a of the sensor holder 8, and this movement causes the tip 8a of the sensor holder 8 to move back and forth. The dirt adhering to the surface is forcibly scraped off. When the dirt on the tip 8a of the sensor holder 8 is peeled off, this is a trigger, and the dirt that has adhered from the tip 8a to the sensor part 10 is peeled off one after another.

  In addition, the reciprocating movement of the cleaning ring 15 is repeated as long as the flow of sewage continues. This makes it difficult for dirt to adhere to the outer peripheral surface of the tip 8a of the sensor holder 8 and the sensor part 10, and prevents the dirt from growing.

  Therefore, the cleaning effect of the sensor unit 10 is enhanced and the dissolved oxygen in the sewage necessary for activating the microorganisms can be accurately measured. In particular, the structure in which the dirt on the tip 8a of the sensor holder 8 is forcibly peeled off by the cleaning ring 15 has a large amount of sewage treated per unit time, and the oxygen in an environment where the sensor part 10 of the dissolved oxygen meter 7 tends to get dirty. It is suitable for the sewage purification apparatus 1 to which the activated sludge method is applied.

  Furthermore, since the cleaning ring 15 is driven by the movable portion 14 that moves in response to the flow of sewage, a dedicated power source such as a pump or a motor is not necessary, and a nozzle that injects water or air. And piping can also be omitted. Therefore, the configuration of the cleaning device 12 can be simplified and provided at a low cost, and the maintenance and management of the cleaning device 12 can be easily performed.

  In addition, since excess oxygen in the air does not need to be supplied to the sensor unit 10, even when the sensor unit 10 is being cleaned, the dissolved oxygen in the sewage is accurately measured by the sensor unit 10. be able to. As a result, the actual dissolved oxygen in the sewage can be measured in real time, which is advantageous in maintaining an appropriate amount of oxygen for activating microorganisms.

  At the same time, in the first embodiment, the linear portion 25 of the guide groove 22 is inclined about 5 ° in the rotation direction of the movable portion 14. Therefore, when the sphere 23 that has moved along the spiral portion 24 of the guide groove 22 is transferred from the terminal end 24 b of the spiral portion 24 to the straight portion 25, the sphere 23 smoothly moves the straight portion 25 without being caught by the straight portion 25. pass.

  For this reason, there is an advantage that the movement of the movable portion 14 is not jerky and the operation of the cleaning ring 15 is stabilized.

  The present invention is not limited to the first embodiment, and can be variously modified without departing from the spirit of the invention.

  For example, in the first embodiment, a spherical body that is rotatably fitted in the guide groove is provided on the inner surface of the movable portion, but the convex portion that is slidably fitted in the guide groove instead of the spherical body. May be provided.

  Furthermore, even if it is a washing body, it is not restricted to the synthetic resin washing ring. For example, a ring-shaped frame that moves following the movable part surrounds the tip of the sensor holder, and a clean brush is attached to the inner peripheral surface of the frame, and the tip of the clean brush adheres to the outer peripheral surface of the sensor holder. The dirt may be scraped off.

FIG. 6 discloses a second embodiment of the present invention.
The second embodiment is different from the first embodiment in that the guide groove of the fixing portion is isolated from the sewage. Other configurations of the cleaning apparatus are the same as those in the first embodiment. Therefore, in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the second embodiment, the length of the fixed portion 13 along the axial direction is set longer than that of the fixed portion 13 of the first embodiment. The guide groove 22 of the fixed portion 13 is formed at an intermediate portion along the axial direction of the fixed portion 13.

  The movable part 14 surrounding the fixed part 13 coaxially has a first end 30a and a second end 30b. The first end portion 30 a is located at one end along the axial direction of the movable portion 14. The second end 30b is located at the other end opposite to the first end 30a along the axial direction of the movable portion 14.

  A first groove 31 is formed on the inner peripheral surface of the first end 30 a of the movable portion 14. The first groove 31 is continuous in the circumferential direction of the movable portion 14. A first sealing material 32 such as an O-ring is mounted in the first groove 31. The first sealing material 32 is slidably in contact with the outer peripheral surface of the fixed portion 13, so that the space between the first end 30 a of the movable portion 14 and the fixed portion 13 is liquid-tightly sealed.

  Similarly, a second groove 33 is formed on the inner peripheral surface of the second end 30 b of the movable portion 14. The second groove 33 is continuous in the circumferential direction of the movable portion 14. A second sealing material 34 such as an O-ring is mounted in the second groove 33. The second sealing material 34 is slidably in contact with the outer peripheral surface of the fixed portion 13, thereby sealing the space between the second end 30 b of the movable portion 14 and the fixed portion 13 in a liquid-tight manner.

  In the present embodiment, the guide groove 22 that opens to the outer peripheral surface of the fixed portion 13 has the first seal material 32 and the first seal member 32 regardless of whether the movable portion 14 has been moved to the first position or the second position. Between the two sealing members 34. Therefore, the guide groove 22 is always liquid-tightly sealed by the movable portion 14 without being exposed to the sewage.

  According to the second embodiment, it is possible to prevent the sewage from entering the guide groove 22 even though the cleaning device 12 is always immersed in the sewage. For this reason, for example, solid contaminants contained in the sewage do not adhere to the inner surface of the guide groove 22 or close the guide groove 22, and the sphere 23 smoothly moves along the guide groove 22 when the movable portion 14 rotates. Move to.

  Therefore, there is an advantage that the movable part 14 and the cleaning ring 15 can be reliably operated in the sewage.

  FIG. 7 discloses a third embodiment of the present invention.

  The third embodiment is different from the first embodiment in the configuration of the guide groove of the fixing portion, and the basic configuration of the cleaning device is the same as that in the first embodiment.

  As shown in FIG. 7, the guide groove 41 formed on the outer peripheral surface of the fixed portion 13 includes a first groove portion 42 and a second groove portion 43. The first groove portion 42 extends upward from the vicinity of the stopper ring 16 in a smooth circular arc upward from the vicinity of the stopper ring 16 so as to make a semicircular circumference on the outer peripheral surface of the fixing portion 13. Therefore, the start end 42a of the first groove portion 42 is located at the lower end of the fixed portion 13, and the end end 42b of the first groove portion 42 is located above the start end 42a.

  The second groove portion 43 is located on the opposite side of the first groove portion 42 with the fixing portion 13 interposed therebetween. The second groove portion 43 connects the start end 42 a and the end end 42 b of the first groove portion 42 so as to make a half turn on the outer peripheral surface of the fixed portion 13. That is, the second groove portion 43 reaches a start end 42 a of the first groove portion 42 by drawing a smooth downward arc from the terminal end 42 b of the first groove portion 42.

  According to such a third embodiment, the sphere 23 of the movable portion 14 rises along the first groove portion 42 of the guide groove 41 following the rotation of the movable portion 14. When the sphere 23 is transferred from the terminal end 42 b of the first groove portion 42 to the second groove portion 43, the sphere 23 descends along the second groove portion 43 of the guide groove 41.

  Therefore, the movable portion 14 performs a reciprocating motion according to the shapes of the first and second groove portions 42 and 43, and the cleaning ring 15 follows the movement of the movable portion 14 and the tip of the sensor holder 8. It moves in the circumferential direction and the axial direction of the outer peripheral surface of the portion 8a.

  Therefore, as in the first embodiment, dirt attached to the outer peripheral surface of the tip 8a of the sensor holder 8 and the sensor 10 can be forcibly scraped off by the cleaning ring 15, and dissolved oxygen in the sewage can be removed. It can always measure accurately.

  DESCRIPTION OF SYMBOLS 7 ... Component detector (dissolved oxygen meter), 8 ... Sensor holder, 8a ... Tip part, 10 ... Sensor part, 12 ... Cleaning apparatus, 13 ... Fixed part, 14 ... Movable part, 15 ... Cleaning body (washing ring).

Claims (7)

A sensor holder having a tip immersed in flowing sewage,
A cleaning device used in a component detector, which is provided at the tip of the sensor holder and includes a sensor unit that detects dissolved components in the wastewater,
A cylindrical fixing part fixed to the sensor holder;
A movable part that is mounted on the outer peripheral surface of the fixed part so as to be immersed in the sewage, reciprocates in the axial direction of the fixed part in response to the flow of the sewage,
A cleaning body that slidably contacts the outer peripheral surface of the tip portion of the sensor holder including the sensor unit, and that reciprocates along the outer peripheral surface of the tip portion of the sensor holder following the movement of the movable portion; A cleaning apparatus comprising:   In Claim 1, It is further provided with the conversion mechanism which converts the rotational motion of the said movable part which receives the flow of the said sewage into the movement of the axial direction of the said fixed part, The said washing body is in the said movable part. A cleaning apparatus characterized by being connected.   3. The conversion mechanism according to claim 2, wherein the conversion mechanism includes a guide groove formed in a spiral shape on an outer peripheral surface of the fixed portion, and a sphere that is supported by the movable portion and rotatably enters the guide groove. The cleaning apparatus characterized by the above-mentioned.   4. The guide groove according to claim 3, wherein the guide groove includes: a spiral portion that goes around the outer peripheral surface of the fixed portion; and a linear portion that extends between the start end and the end of the spiral portion and extends in the axial direction of the fixed portion. And a cleaning device.   5. The movable portion according to claim 4, wherein the movable portion is separated from the first position corresponding to the start end of the spiral portion and the first position so as to correspond to the end of the spiral portion in the axial direction of the fixed portion. The cleaning device is capable of reciprocating between the second position and being always urged toward the first position by an elastic body. 6. The movable portion according to claim 5, wherein the movable portion has a first end portion and a second end portion located on the opposite side of the first end portion, and the first end portion and A ring-shaped sealing material that seals between the fixed portion and the movable portion is attached to the second end portion, respectively.
The guide groove of the fixed portion has the sealing material and the second end portion of the first end portion in a state where the movable portion is moved to either the first position or the second position. The cleaning apparatus is located between the sealing material and the cleaning device.   7. The movable portion according to claim 1, wherein the movable portion includes a plurality of blades that receive the flow of the sewage, and the blades are spaced apart in a rotation direction of the movable portion. A cleaning device, wherein the cleaning device is arranged.

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