JP2012200624A - Automatic strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic strainer having a simple structure, capable of nearly securely removing a captured solid object adhering to an inner peripheral surface of a cylindrical element by using only a cleaning member, and allowing easy maintenance.SOLUTION: The automatic strainer includes: a casing 2 including a liquid inlet port 8, a liquid outlet port 9, and a captured object discharge port 10; the cylindrical element 3 formed with a large number of holes; a rotation shaft 6 rotatably arranged in the element 3; a first cleaning member 4 mounted to the rotation shaft 6; a plurality of projections 5 aligned in the axial direction of a predetermined position on an inner surface of the element 3; and a driving device 22. Liquid flowing from the liquid inlet port 8 is made to flow into the element 3. The automatic strainer captures the solid object in the liquid by making the liquid permeate through a porous wall surface while making the liquid flow and pass in the element 3, and makes the permeated liquid flow out of the liquid outlet port 9. The first cleaning member 4 is frictionally run on the inner peripheral surface of the element 3 to remove the captured object adhering to the inner peripheral surface of the element 3. The captured object is discharged from the captured object discharge port 10 to the outside. The solid object adhering to the first cleaning member 4 is scraped by the projections 5.

Description

  The present invention relates to an automatic strainer for removing solid matter from a liquid containing many solid matters such as domestic wastewater, sewage, seawater, river water, factory wastewater, office building wastewater and the like.

  Conventionally, as this type of strainer, a cylindrical element having a large number of holes for filtration is fixedly arranged in a casing, and the trapped solid matter trapped in each hole of the element and attached to the inner peripheral surface is contained in the element. The entire element outer peripheral surface can be cleaned by rotating the element while ejecting the liquid, and a brush that is not so strong for removing from the peripheral surface and discharging it, and a nozzle that ejects liquid over the entire length of the element outer periphery. In addition, a strainer configured to remove trapped solid matter adhering to the inner peripheral surface of the element is well known.

JP 2001-162114 A

  However, when applied to untreated sewage, etc., where the amount of solids, hair, and fibers in the liquid is very large, the strainer immediately clogs the many holes of the element with the trapped material and cleans it. Injecting the member and the liquid onto the outer peripheral surface of the element cannot remove the trapped solid matter, and the differential pressure between the liquid inlet and outlet of the strainer device increases and the operation becomes impossible. Further, even if the trapped matter is removed from the inner periphery of the element, the hair and fibers that are the removed solid matter may accumulate on the cleaning member, and the cleaning ability of the cleaning member may be reduced. When the cleaning ability of the cleaning member is reduced in this way, after the drainage of the liquid inside the strainer, the solid matter accumulated on the cleaning member must be removed to restore the cleaning ability of the cleaning member. there were. In addition, in order to periodically remove the trapped solid matter adhering to the inner surface of the element, a backwashing device for injecting liquid toward the element is required. In addition to the complexity of the structure of the strainer itself, Therefore, ancillary facilities such as pumps were necessary.

  The present invention has been made in view of the above points, and has a simple structure, and it is possible to remove the trapped solid matter adhering to the inner peripheral surface of the cylindrical element with a cleaning member only with certainty. The purpose is to provide.

  In order to solve the above-mentioned problems, the present invention provides a casing having a liquid inlet, a liquid outlet, and a trapped substance outlet, and a cylindrical element that is rotatably arranged in the casing and has a porous wall surface. A rotary shaft that is rotatably arranged in the element along the axial direction; a first cleaning member that is attached to the rotary shaft and has a tip that rubs on the inner peripheral surface of the element; and a predetermined position on the inner surface of the element A plurality of protrusions arranged in the axial direction and a drive device that rotates the rotating shaft, and the liquid that has flowed into the casing from the liquid inflow port flows into the element from an opening provided at one end. The solids in the liquid are captured by passing through the pores of the wall while flowing through the element, the permeate is allowed to flow out of the liquid outlet, and the first cleaning member is moved by rotation of the rotating shaft. in front Rubbing on the inner peripheral surface of the element, removing the trapped substance adhering to the inner peripheral surface of the element, allowing the trapped substance to flow into the casing from an opening provided at the other end of the element, and The solid matter that is discharged to the outside and adhered to the first cleaning member is scraped off by the projection when the first cleaning member passes through the projection.

  In the automatic strainer according to the present invention, the plurality of protrusions are arranged in a staggered footprint in the axial direction at a predetermined position on the inner peripheral surface of the element.

  In the automatic strainer according to the present invention, the first cleaning member includes screw blades formed at a predetermined spiral pitch in an axial direction fixed to the rotating shaft, and a brush attached to an outer peripheral portion of the screw blades. The tip of the brush rubs on the inner peripheral surface of the element by the rotation of the rotating shaft, and a flow thrust is applied to the liquid in the element.

  In the automatic strainer according to the present invention, a plurality of brushes of the first cleaning member are arranged in the longitudinal direction of the outer periphery of the screw blade.

  In the automatic strainer according to the present invention, the rotation direction and / or the number of rotations of the rotation shaft by the driving device can be varied.

  Further, the present invention is characterized in that the automatic strainer includes a second cleaning member that rubs the outer peripheral surface of the element by the rotation of the element.

  In the automatic strainer according to the present invention, an element rotation shaft connected to the element provided concentrically on the outer periphery of the rotation shaft is provided, the rotation shaft and the element rotation shaft are connected, and the rotation shaft Rotational force transmitting means for transmitting the rotational force to the element rotation shaft is provided.

  In the automatic strainer according to the present invention, one or a plurality of cleaning ports for cleaning the entire peripheral surface of the element by spraying a cleaning liquid onto the outer peripheral surface of the rotating element at a predetermined position of the casing. It is provided with.

  In the automatic strainer according to the present invention, a pressure detection end for detecting the liquid inlet liquid pressure and the liquid outlet liquid pressure of the casing is provided, and the rotational speed of the rotary shaft by the driving device is controlled to A control unit is provided for controlling the rubbing speed of the inner circumferential surface of the element of the first cleaning member, and the control unit is configured to adjust the liquid inlet liquid pressure and the liquid outlet hydraulic pressure of the casing during operation of the automatic strainer. When the differential pressure becomes greater than or equal to a first predetermined value, the rubbing speed of the inner circumferential surface of the first cleaning member is increased, and when the differential pressure value returns to the original state, the first cleaning member. The rubbing speed of the inner peripheral surface of the element is returned to the original.

  According to the present invention, in the automatic strainer, an electromagnetic on-off valve is provided at each of the liquid inlet and the trapped substance outlet, and the controller controls the rotational speed of the rotary shaft by the driving device to control the first A rubbing speed control function for controlling the rubbing speed of the inner circumferential surface of the element of the cleaning member, and a rubbing direction changing function for changing the rubbing direction, and the control unit is configured to operate the automatic strainer during the operation of the automatic strainer. An electromagnetic on-off valve provided at the liquid inlet when the differential pressure between the liquid inlet liquid pressure of the casing and the liquid outlet liquid pressure exceeds a second predetermined value exceeding the first predetermined value; The electromagnetic on-off valve provided at the trapping object discharge port is closed, the rubbing of the inner circumferential surface of the element by the first cleaning member is stopped, and then the inner circumferential surface of the element is rubbed at a predetermined speed for a predetermined time. And then the first Cleaning member according to a predetermined time Kosuhashi changed Kosuhashi direction of the element inner surface, this was a predetermined number of times, characterized in that it comprises a function to return to the original operating condition.

  Further, in the automatic strainer operating method for operating the automatic strainer, the solid matter that is difficult to remove the solid matter attached to the inner periphery of the element by rubbing the inner periphery of the element of the first cleaning member. When the liquid containing the liquid flows in from the liquid inflow port, the liquid inflow from the liquid inflow port is stopped, and the rotation of the rotating shaft by the driving device is stopped so that the inner circumferential surface of the element is rubbed by the first cleaning member. After that, the rotational speed of the rotary shaft by the drive device is set to a predetermined rotational speed, the rotational shaft is rotated at a predetermined rotational speed, and the first cleaning member is rubbed on the inner peripheral surface of the element at a predetermined speed, and The rotating direction of the rotating shaft is periodically changed to change the rubbing direction of the inner circumferential surface of the element by the first cleaning member, so that solid matter adhering to the inner circumferential surface of the element is intensively removed, and then the liquid from the liquid inlet Resume inflow .

  In addition, the automatic strainer operating method for operating the automatic strainer, wherein the liquid inflow from the liquid inlet, the liquid outlet of the filtered liquid, and the trapped solids are discharged from the trapped material outlet. When the difference between the liquid inlet liquid pressure and the liquid outlet liquid pressure exceeds a predetermined value, the liquid inflow from the liquid inlet is stopped, and the rotation of the rotating shaft by the driving device is stopped so that the inside of the element by the first cleaning member is stopped. Stop the rubbing of the peripheral surface, then set the rotational speed of the rotating shaft by the drive device to a predetermined rotational speed, rotate the rotating shaft at the predetermined rotational speed, and scrape the cleaning member on the inner peripheral surface of the element at a predetermined speed. And periodically changing the rotation direction of the rotating shaft to change the rubbing direction of the inner peripheral surface of the element by the cleaning member, and repeating the operation of removing the solid matter adhering to the inner periphery of the element a predetermined number of times, Return to normal operation .

  Further, in the operation method of the automatic strainer for operating the automatic strainer, if the difference between the liquid inlet liquid pressure and the liquid outlet liquid pressure becomes a predetermined value or more and the filtration capacity is not recovered even after performing the above operation method, The liquid inflow is stopped and the rotation of the rotating shaft by the driving device is stopped to stop the rubbing of the inner peripheral surface of the element by the first cleaning member, and the rotating shaft by the driving device is then moved in a predetermined direction at a predetermined number of rotations for a predetermined time. Rotate the element, rotate the element outer peripheral surface by the second cleaning member, and then repeat the operation of rotating the element by rotating the rotating shaft by the driving device in the opposite direction for a predetermined time at a predetermined number of times. After removing the solid matter adhering to the outer peripheral surface of the element, the liquid inflow from the liquid inlet, the liquid outlet of the filtered liquid, the trapped solid outlet Return to normal operation to perform the discharge of.

  In the present invention, the liquid that has flowed into the casing from the liquid inlet is allowed to flow into the element through an opening provided at one end, and the solid matter in the liquid is captured by passing through the pores of the wall surface while flowing through the element. The permeate is allowed to flow out of the liquid outlet, and the cleaning member is rubbed against the inner peripheral surface of the element by the rotation of the rotating shaft to remove the trapped matter adhering to the inner peripheral surface of the element. The element flows into the casing from the opening provided at the end, is discharged to the outside from the trap discharge port, and the solid adhering to the cleaning member is scraped off by the protrusion when the cleaning member passes through the protrusion. The filtration function of the automatic strainer can be maintained for a long period of time without deteriorating the capture function of the solid matter in the permeated liquid.

  In addition, by removing the solid matter attached to the inner peripheral surface of the element with the cleaning member, the solid matter attached to (entangled with) the cleaning member passes through the protrusion provided on the inner surface of the element when the cleaning member passes through this protrusion. Therefore, the removal function of the solid matter adhered to the inner surface of the element of the cleaning member is not lowered, and the filtration function of the automatic strainer can be maintained without deteriorating for a long time.

  In addition, by not reducing the function of removing the solid matter adhering to the inner peripheral surface of the cleaning member over a long period of time, it is possible to greatly suppress the solid matter adhering to the inner surface of the element, and backwashing from the outside There is no need for a process, and there is no need for incidental equipment including pumps, piping, and electrical equipment for backwashing.

  In addition, the automatic strainer according to the present invention can be applied without any problem as untreated sewage having a very large amount of solids in the liquid as a treatment liquid, such as sewage filtered by the automatic strainer. This treatment liquid can be used effectively as a heat source for a district heating system or the like, for example, directly through a heat exchanger, and can greatly contribute to energy saving.

  Also, if the amount of solids in the liquid to be treated is very large, the solid matter adhering to the inner peripheral surface of the element cannot be removed by simply rubbing the inner peripheral surface of the element with the cleaning member. The remaining trapped matter clogs the pores of the element wall surface, and the differential pressure between the pressure at the liquid inlet of the casing and the pressure at the liquid outlet increases, and the automatic strainer cannot be operated. In this case, the liquid inflow from the liquid inlet is stopped, the residual trapped material is removed intensively by rubbing the inner peripheral surface of the element by the cleaning member. By doing so, the automatic strainer according to the present invention can be operated unattended even for untreated sewage or the like in which the amount of solid matter in the liquid to be treated is very large.

  Furthermore, the amount of solid matter remaining in the element is determined based on the differential pressure between the liquid inflow side and the liquid outflow side of the element, that is, the differential pressure between the liquid inlet and the liquid outlet, and the drive device is driven by, for example, an inverter. Power consumption during automatic strainer operation by adjusting the drive power frequency from the inverter and adjusting the rotational speed of the rotating shaft, that is, adjusting the sliding speed of the inner peripheral surface of the element by the cleaning object. Can be kept low, and energy saving can be improved.

  In addition, since the second cleaning member that rubs the outer peripheral surface of the element by the rotation of the element is provided, the solid matter that exudes from the pores of the element and adheres to the outer peripheral surface of the element can be removed. If the filtration function of the automatic strainer decreases due to adhesion to the surface, the filtration capacity can be quickly recovered.

It is a longitudinal cross-sectional view which shows the structure of the automatic strainer which concerns on this invention. It is a cross-sectional view which shows the structure of the automatic strainer which concerns on this invention. It is a figure which shows the structure of the element of the automatic strainer which concerns on this invention. It is a figure which shows the structure of the cleaning member of the automatic strainer which concerns on this invention. It is a figure which shows the brush of the cleaning member of the automatic strainer which concerns on this invention, and its attachment structure. It is a figure which shows the removal condition of the capture | acquisition solid substance by the element internal peripheral surface sliding by the brush of the cleaning member of the automatic strainer which concerns on this invention. It is a figure which shows the attachment structure of the cleaning member by the element outer peripheral surface sliding of the automatic strainer which concerns on this invention. It is a figure which shows the removal condition of the capture | acquisition solid substance by the element outer peripheral surface rubbing by the brush of the cleaning member of the automatic strainer which concerns on this invention. It is a figure which shows the cross-section of the rotating shaft spline for cleaning members of the automatic strainer which concerns on this invention, and the rotating shaft key for elements. It is a figure which shows the filtration capability recovery procedure of the automatic strainer which concerns on this invention. It is a figure which shows the disassembly procedure of the automatic strainer which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described in detail. 1 and 2 are diagrams showing an example of the structure of an automatic strainer according to the present invention. FIG. 1 is a longitudinal sectional view and FIG. 2 is a transverse sectional view. The automatic strainer 1 includes a cylindrical casing 2 that is supported by support legs 26 and 27 and arranged horizontally. The upper part of the casing 2 is provided with a liquid inlet 8 at one end, a liquid outlet 9 at a position away from the inlet 8 to the other end, and a trapped substance outlet 10 at the other end at the lower part. It has been. Further, a flange 13 and a flange 14 are provided at both ends of the casing 2, respectively. 3 is a cylindrical element in which a large number of solid material capturing holes are formed on the wall surface, and the element 3 is concentrically rotatable and sealed at both ends in the casing 2 via sealing materials 18 and 20. Has been placed.

  Reference numeral 4 denotes a cleaning member (first cleaning member) that removes trapped solid matter trapped in the pores of the element 3 and adhered to the inner peripheral surface by rubbing the inner peripheral surface. The cleaning member 4 is a screw conveyor type. The cleaning member rotating shaft 6 is disposed concentrically and rotatably in the casing 2. One end of the cleaning member rotating shaft 6 is supported on the flange 14 by a bearing 21, and the other end is connected to a connecting rotating shaft 32. The connecting rotating shaft 32 is supported by a bearing 15. Here, the cleaning member rotating shaft 6 and the connecting rotating shaft 32 constitute a rotating shaft for rotating the cleaning member 4.

  The bearing 15 is supported by the stand 30 via a support member 33. Then, as will be described in detail later, screw blades 39 are fixed to the cleaning member rotating shaft 6 by welding or the like, and the longitudinal direction of the outer peripheral portion of the screw blades 39 is divided into a plurality over the entire length. 41 is a fixed structure. Reference numeral 7 denotes an element rotation shaft that is concentric with the cleaning member rotation shaft 6 and is positioned on the outer peripheral side. The element rotation shaft 7 is concentrically arranged in the casing 2 via bearings and seal members 16 and 17. 11 is a stay and ring on the liquid inflow side of the element 3, and 12 is a ring on the liquid outlet side of the element 3. The bearing 15 is supported and arranged in the stand 30 via a support member 33, and the bearing / seal member 16 is supported by the flange 13.

  Reference numeral 30 denotes a stand for attaching a drive device 22 such as an electric motor to the casing, and one end of a connecting rotary shaft 32 is connected to a rotary shaft 31 of the drive device 22 attached to the stand 30 via a coupling 23. As described above, one end of the cleaning member rotating shaft 6 is connected to the other end of the connecting rotating shaft 32 by a spline (see FIG. 9A), and the cleaning member 4 is rotated by the rotational force of the driving device 22. It has become. The element rotary shaft 7 and the bearing / seal member 17 are connected by a key (see FIG. 9B). Reference numeral 24 denotes an element power transmission half coupling, and the element power transmission bolt 25 is screwed into the screw hole of the connecting rotary shaft 32 so that the rotational force of the drive device 22 is divided into the element power transmission half coupling. 24, the element power transmission bolt 25, the element rotating shaft 7, the bearing / seal member 17, and the liquid inflow side stay and the ring 11 are transmitted to the element 3 to rotate the element 3.

  3A and 3B are diagrams showing the structure of the element 3, in which FIG. 3A is a partially sectional side view, and FIG. 3B is a half right side view. The element 3 is a cylindrical body made of a plate body such as a stainless steel plate in which a large number of solid material capturing holes 3a such as punching metal are formed, and seal rings 35 are provided on the outer periphery of both ends and the outer periphery of the center. In FIG. 1, the illustration of the seal ring 35 at the center of the element 3 is omitted. A cylindrical element 3 is rotatably arranged in the casing 2 with bearing / seal members 18 and 20 interposed between the seal ring 35 and the inner peripheral surface of the inner peripheral protrusion 2 a of the casing 2. In addition, element support members 19 arranged at predetermined intervals are arranged in a bowl shape on the outer periphery of the element 3.

  Further, as will be described in detail later, an assembly of the cleaning member rotating shaft 6, the element 3, the cleaning member 4, the element support member 19 and the like is integrally stored in the casing 2, and the assembly is integrated into the casing. 2 can be easily pulled out. Roller mounting holes (not shown) for mounting pulling rollers 47 and 48 are provided at the bottom of the casing 2, and when the assembly is pulled out from the casing 2, as will be described in detail later, The drawing rollers 47 and 48 are inserted through the roller mounting holes, and the element support member 19 is pressed on the surface of the drawing rollers 47 and 48 and mounted on the casing 2. As a result, when a pulling force is applied to the assembly, the pulling rollers 47 and 48 rotate and the assembly can be pulled out smoothly. The roller mounting hole is normally closed with a lid.

  Further, in the longitudinal direction of the inner peripheral predetermined position of the element 3, a rivet type for removing (scraping) solid matter attached (entangled) to the brush 41 (shown in FIGS. 4 and 5) of the cleaning member 4 is provided. A pair of protrusion mounting plates 36 and 37 in which the protrusions 5 are arranged at equal intervals are provided. The protrusion mounting plate 36 and the protrusion mounting plate 37 are arranged side by side so that the protrusions 5 are positioned between the protrusions 5 and 5 of the counterpart, and all the protrusions 5 are the inner peripheral surface of the element 3. Are arranged in zigzag footprints in a longitudinal direction (zigzag with a predetermined width on the left and right).

  4A and 4B are diagrams showing a schematic structure of the cleaning member 4, in which FIG. 4A is a side view and FIG. 4B is a partially cut-out right side view. As shown in the figure, the cleaning member 4 has a screw blade 39 having a spiral formed at a predetermined pitch on the outer periphery of the cleaning member rotating shaft 6 by welding or the like. The outer periphery of the screw blade 39 extends over the entire length in the longitudinal direction. In this structure, a plurality of brushes 41 are mounted in an array. As shown in FIG. 5, the brush 41 has a configuration in which a brush material 43 is fixed to a brush mounting plate 42, and is divided into a plurality of lengths in the longitudinal direction of the outer periphery of the screw blades 39. 44 is fixed. In this state where the brush 41 is attached over the entire length of the outer peripheral portion of the screw blade 39, the tip of the brush material 43 of the brush 41 comes into contact with the entire length of the element 3 in the axial direction of the inner peripheral surface. By rotating the rotary shaft 6, the tip of the brush material 43 rubs the inner peripheral surface of the element 3, and the trapped solid matter adhering to the entire inner surface of the element 3 can be scraped and removed. As the material of the brush material 43, any material may be used as long as it has sufficient strength to scrape solid matter attached to the inner peripheral surface of the element 3 and has an elastic force. For example, a polypropylene resin material having a diameter of 0.6 mm can be used.

  As described above, the cleaning member 4 has a structure in which the plurality of brushes 41 are fixed in the longitudinal direction of the outer peripheral portion of the screw blade 39 fixed to the outer periphery of the cleaning member rotating shaft 6, thereby the brush material 43 of the brush 41. Is damaged due to wear or the like, and the solid matter removing ability to remove the solid portion attached to the inner peripheral surface of the element 3 of the cleaning member 4 is deteriorated, the solid of the cleaning member 4 is replaced by replacing only the damaged brush 41. The object removal ability can be easily recovered.

  As described above, the plurality of brushes 41 are arranged and mounted over the entire length in the longitudinal direction of the outer peripheral portion of the screw blade 39 of the cleaning member 4, and the tip end portion of the brush material 43 is in contact with the inner peripheral surface of the element 3. The configuration is such that screw-like brushes having a uniform pitch in the direction are formed, and the tip of the brush 41 rubs the inner peripheral surface of the element 3 (scrubbing and scrubbing) by the rotation of the cleaning member 4. Liquid containing many solids such as domestic wastewater, sewage, seawater, river water, factory wastewater, office building wastewater, etc. flows into the casing 2 as shown by arrow A from the liquid inlet 8 of the automatic strainer 1 shown in FIG. Then, the element 3 flows into the element 3 from the end opening (the opening of the stay and the ring 11) on the liquid inlet 8 side of the element 3.

  Since the screw conveyor type cleaning member 4 rotates in the element 3, a flow-through thrust is applied to the liquid, and the liquid flows through the element 3 from the liquid inlet 8 side end to the opposite side. While passing through the porous 3a on the wall surface of the element 3. Solids in the liquid are captured by the pores 3 a and adhere to the inner peripheral surface of the element 3. The permeated liquid flows out from the liquid outlet 9 as shown by an arrow B, and the tip of the brush 41 of the cleaning member 4 rubs along the inner peripheral surface of the element 3, so that the element 3 captured by the porous 3 a is captured. The solid matter adhering to the inner peripheral surface of the element 3 is scraped and removed by the brush 41, and is transferred by the rotation of the brush 41 arranged in a screw shape. From the opening at the other end of the element 3 (the opening of the ring 12), the casing 2 and flows out of the automatic strainer 1 as shown by an arrow C from the trapped material discharge port 10.

  The solid matter (especially hair and fibers) removed by the brush 41 adheres to the brush material 43 of the brush 41 by being entangled or the like, but this solid matter is attached to the projection attachment plates 36 and 37 by the brush material 43. 6 (a) to (c), the projection 5 is scraped from the brush material 43, so that a large amount of solid matter is entangled with the brush material 43 and remains. Never do. At this time, since the entire large number of protrusions 5 are arranged in a zigzag footprint in the longitudinal direction of the inner circumferential surface of the element 3 as described above, the solid matter is previously formed by the protrusions 5 that pass through the brush material 43 first. It is scraped off.

  The solid matter remaining on the brush member 43 positioned between the protrusions 5 due to the scraping of the solid matter is loosened, and is easily scraped off by the protrusions 5 that pass later. It was confirmed that almost all of the solid matter entangled with the brush material 43 was efficiently scraped off and removed. That is, by arranging a large number of protrusions 5 in a zigzag footprint in the longitudinal direction at a predetermined position on the inner surface of the element 3, the solid matter entangled with the brush material 43 is simply compared to the case where the protrusions are linearly arranged in the longitudinal direction. It was confirmed that almost all was removed efficiently.

  Since the brush material 43 of the brush 41 scrapes the solid matter trapped by the perforations 3a on the inner peripheral surface of the element 3, the brush material 43 is a solid material as described above in order to sufficiently exhibit this solid matter scraping action. It is required to be a member that needs sufficient strength to scrape off the object and has elasticity (with a restoring force that quickly restores the original state after the solid material is scraped and bent) . Here, since the φ 0.6 mm polypropylene resin is used as described above, the scraping ability (capturing ability) of the solid matter attached to the inner peripheral surface of the element 3 is greatly improved. The brush material 43 is not limited to a resin material as long as it has strength and elasticity to scrape solid matter attached to the inner peripheral surface of the element, and may be any material.

  Also, it is confirmed that the solid matter entangled with the brush material 43 is scraped off efficiently by the protrusions 5 by reversing the rotation direction of the driving device 22 and reversing the brush material 43. Has been. Therefore, if the amount of solid matter entangled with the brush material 43 increases, or by periodically rotating the rotation direction of the brush material 43 (the direction of rubbing the inner peripheral surface of the element 3 of the brush material 43), The solid matter entangled with the brush material 43 can be efficiently scraped off by the protrusion 5, and the ability to remove the solid matter attached to the inner peripheral surface of the element 3 of the brush material 43 can be maintained in a high state.

  The trapped solid matter adhering to the inner peripheral surface of the element 3 as described above is scraped and removed by the brush 41 of the cleaning member 4, but there is also a solid matter that remains on the inner peripheral surface without being completely removed. This residual solid matter increases with the passage of time, and may impede the filtration action of capturing the solid matter in the liquid flowing into the automatic strainer 1. The inhibition of the filtering action by the residual solid appears as a pressure difference between the liquid inlet 8 and the liquid outlet 9 of the automatic strainer 1. Therefore, here, a pressure detection end 28 and a pressure detection end 29 are provided at the liquid inlet 8 and the liquid outlet 9, respectively, and the pressure difference between the pressure detected at the pressure detection end 28 and the pressure detected at the pressure detection end 29 is monitored. By doing so, the amount of residual solids deposited on the inner peripheral surface of the element 3, that is, the filtration capacity of the automatic strainer 1 is monitored. When the filtration capacity falls below a predetermined level, the filtration capacity is recovered by control as shown in the first and second embodiments.

  Here, the drive device 22 is configured such that, for example, an inverter drive motor (not shown) is used, and the motor rotation speed can be controlled by changing the drive power frequency output from the inverter to the motor under the control of the control unit. Then, for example, an electromagnetic opening / closing valve (not shown) is connected to the liquid inlet 8 so that the liquid flowing in from the liquid inlet 8 can be stopped by closing the electromagnetic opening / closing valve. And the discharge of the trapped object can be stopped by closing the electromagnetic on-off valve.

Embodiment 1
Then, the control unit monitors the pressure difference between the pressure detection end 28 and the pressure detection end 29, and when the pressure difference exceeds a first predetermined value, the amount of trapped solid matter deposited on the inner peripheral surface of the element 3 is increased. Assuming that the filtration capacity of the automatic strainer 1 is reduced beyond a predetermined level, the rotational speed of the electric motor, which is the drive device 22, is increased to increase the rubbing speed for rubbing the inner peripheral surface of the element 3 of the brush 43. As a result, the removal amount of the solid matter adhering to the inner peripheral surface of the element 3 is increased, and the action of scraping the solid matter entangled with the brush 43 with the protrusions 5 is increased, so that the filtration capacity of the automatic strainer 1 is quickly recovered. be able to. When the filtration ability is recovered by increasing the rubbing speed of rubbing the inner peripheral surface of the element 3 by the brush 43 without stopping the liquid flowing in from the liquid inlet 8 as described above, When the pressure difference between the detection end 28 and the pressure detection end 29 decreases and becomes a predetermined set value or less, the rotational speed of the driving device 22 is returned to the original value, and the operation of the automatic strainer 1 is continued. By adopting such an operation method, it is possible to operate the automatic strainer 1 unattended while maintaining a filtering capacity in an optimum state with little energy such as electric power for driving the driving device 22.

[Embodiment 2]
In the automatic strainer, the control unit monitors a pressure difference between the pressure detection end 28 and the pressure detection end 29, and the pressure difference is equal to or higher than a second predetermined value which is a pressure difference higher than the first predetermined value. In this case, the electromagnetic on-off valve connected to the liquid inlet 8 is closed, the liquid flowing into the casing 2 from the liquid inlet 8 is stopped, the rotation of the rotary shaft 21 by the driving device 22 is stopped, and the brush The sliding of the inner peripheral surface of the element 3 by 43 is stopped, and the electromagnetic on-off valve connected to the captured object discharge port 10 is closed to stop the discharge (discharge) of the captured object.
To do.

  Thereafter, the rotational speed of the rotary shaft 31 by the electric motor as the driving device 22 is set to a predetermined rotational speed (set higher than the rotational speed during normal operation), and the rotary shaft 31 is rotated at the predetermined rotational speed to move the brush 43 to a predetermined speed. Then, the inner peripheral surface of the element 3 is rubbed. And the rotation direction of the rotating shaft 31 is changed periodically, and the rubbing direction of the inner peripheral surface of the element 3 by the brush 43 is changed. The brush 43 is repeatedly rubbed on the inner peripheral surface of the element 3 at a predetermined speed and the operation of changing the rubbing direction is repeated to remove solid matter attached to the inner periphery of the element 3 in a concentrated manner. Thereafter, the liquid inflow from the liquid inflow port 8 is resumed, the rotation of the rotating shaft 21 by the driving device 22 is returned to normal, the discharge of the captured material from the captured material discharge port 10 is started, and the normal operation is resumed. By adopting such an operation method, it is possible to quickly recover the temporarily reduced filtration capacity and return the automatic strainer 1 to normal operation.

FIG. 10 is a diagram showing a procedure for recovering the filtration capability of the automatic strainer 1. First, in step ST1, it is determined whether or not the difference (P _IN −P _OUT ) between the difference between the liquid inlet pressure P _IN detected at the pressure detection end 28 and the liquid outlet pressure P _OUT detected at the pressure detection end 29 is a predetermined set value or more. If it is determined that the value is equal to or greater than the predetermined set value (Y), the process proceeds to step ST2, where the trapped object discharge port 10 stops the trapped substance discharge, stops the liquid inflow to the liquid inlet 8, and stops the operation of the driving device 22. If these operation stops are confirmed (Y), the process proceeds to step ST4. In step ST4, the reverse drive operation of the drive device 22 is performed. In step ST5, it is determined whether or not the predetermined reverse drive time has elapsed. If yes (Y), the reverse drive operation of the drive device 22 is stopped in step ST6. Subsequently, in step ST7, the forward drive operation of the drive device 22 is performed. In step ST8, it is determined whether a predetermined set time has elapsed. If yes (Y), the forward drive operation of the drive device 22 is performed in step ST8. The rolling operation is stopped, and the process proceeds to step ST10. In step ST10, it is determined whether or not the reverse rotation and forward rotation operation of the drive device 22 for this predetermined set time has been performed a predetermined number of times. If the predetermined number of times is reached, the drive device operation (forward rotation operation) is performed in step ST11. Then, liquid inflow to the liquid inlet 8 and opening of the electromagnetic on-off valve connected to the captured material discharge port 10 are resumed.

  By controlling the automatic strainer 1 as described above, it is not necessary to perform a backwashing process for recovering the filtration capacity like a conventional automatic strainer, and a large-scale pump, piping, and electric for performing the backwashing are performed. Ancillary equipment such as equipment becomes unnecessary. Moreover, what is necessary is just to determine suitably about the 1st, 2nd predetermined value which is a pressure difference of the pressure detection end 28 and the pressure detection end 29 by experiment.

[Embodiment 3]
In the first and second embodiments, the control unit monitors the pressure difference between the pressure detection end 28 and the pressure detection end 29, and recovers the filtering ability when the pressure difference is equal to or greater than the first or second predetermined pressure difference. However, instead of the pressure difference, an operation for manually recovering the overcapacity may be performed every period. In other words, after the first predetermined operation period has elapsed in the automatic strainer 1, the rotational speed of the electric motor, which is the driving device 22, is increased by manual operation to increase the rubbing speed for rubbing the inner peripheral surface of the element 3 of the brush material 43. By increasing the removal amount of the solid matter adhering to the inner peripheral surface of the element 3 and increasing the amount of the solid matter entangled with the brush material 43 with the protrusion 5, the filtration capacity of the automatic strainer 1 can be increased. It can be recovered quickly.

  When a second predetermined operation period exceeding the first period has elapsed, the electromagnetic on-off valve connected to the liquid inflow port 8 is closed by manual operation to stop the liquid flowing into the casing 2, and the drive device The rotation of the rotary shaft 21 by the electric motor 22 is stopped, the rubbing of the inner peripheral surface of the element 3 by the brush material 43 is stopped, and the electromagnetic on-off valve connected to the captured object discharge port 10 is closed to discharge the captured object. The discharge (discharge) of the trapped substance from the outlet 10 is stopped. Thereafter, the rotational speed of the rotating shaft 31 by the electric motor as the driving device 22 is rotated at a predetermined rotational speed, and the brush material 43 is rubbed on the inner peripheral surface of the element 3 at a predetermined speed. And the rotation direction of the rotating shaft 31 is changed periodically, and the rubbing direction of the inner peripheral surface of the element 3 by the brush material 43 is changed. The operation of changing the rubbing direction at a predetermined speed on the inner peripheral surface of the element 3 by the brush material 43 is repeated, and solid matter attached to the inner periphery of the element 3 is intensively removed. Thereafter, the liquid inflow from the liquid inflow port 8 is resumed, the rotation of the rotating shaft 21 by the driving device 22 is returned to normal, the discharge of the captured material from the captured material discharge port 10 is started, and the normal operation is resumed.

  Solid matter that oozes out from the perforations 3a on the wall surface of the element 3 and adheres to the outer peripheral surface of the element 3 also causes a reduction in filtration capacity. Therefore, when the amount of solid matter adhering to the outer peripheral surface of the element 3 increases, it is necessary to remove the solid matter and restore the filtration ability. In order to remove the solid matter adhering to the outer peripheral surface of the element 3, the element power transmission bolt 25 is screwed into a bolt screwing hole provided in the connecting rotary shaft 32. As a result, the rotational force of the connecting rotary shaft 32 is transmitted to the element rotary shaft 7 via the element power transmission bolt 25 and the element power transmission half coupling 24, whereby the element 3 rotates. As shown in FIG. 7, a brush material (second cleaning member) 44 whose tip attached to the element support member 19 is in sliding contact with the outer peripheral surface of the element 3 is provided on the outer peripheral portion of the element 3. By rotating the element 3, the outer peripheral surface of the element 3 is rubbed from the brush material 44, and the solid matter m attached to the outer peripheral surface of the element 3 is as shown in FIGS. It is scraped off with the brush material 44.

  If the filtration capacity is not restored even after the procedure for restoring the filtration capacity of the automatic strainer 1 is executed, the element power transmission port 25 is screwed into the connecting rotary shaft 32 as described above so that the element can rotate. To. Then, after the liquid in the casing 2 is discharged, a high-pressure cleaning liquid is applied to the entire outer peripheral surface of the element 3 from one or a plurality of cleaning ports provided at predetermined positions of the casing while the element 3 is rotated by the driving device 22. Spray. As a result, the entire outer peripheral surface of the element 3 is cleaned with the high-pressure cleaning liquid.

  If the filtration capacity of the automatic strainer 1 is attenuated as described above and the filtration capacity does not recover even after performing the automatic recovery procedure of the filtration capacity, the high pressure cleaning liquid is applied to the outer peripheral surface of the element 3 while rotating the element 3. By spraying and cleaning the element 3, solid matter adhering to the outer peripheral surface of the element 3 can be removed, and the filtration capacity of the automatic strainer 1 can be recovered.

  When the brush material 43 or the brush material 44 is deteriorated due to wear or the like, the automatic strainer 1 extracts the assembly of the cleaning member rotating shaft 6, the element 3, the cleaning member 4, and the element support member 19 from the casing 2. The brush material 44 can be easily replaced. FIGS. 11A to 11C are views showing a procedure for extracting the assembly from the casing 2. First, as shown in FIG. 2A, the rollers 47 and 48 are inserted from the roller mounting holes provided in the bottom of the casing 2, and the roller mounting holes 49 and 50 to which the rollers 47 and 48 are fixed are used. Is closed and the lids 49 and 50 are fixed to the casing 2. By inserting an elastic body between the shafts of the rollers 47 and 48 and the lids 49 and 50, the rollers 47 and 48 are mounted on the casing 2 with the outer peripheral surfaces of the rollers 47 and 48 pressing the element support member 19. Is done. Subsequently, the flange 14 on the captured object discharge port 10 side is removed from the end of the casing 2 as shown in FIG.

  Subsequently, as shown in FIG. 5C, the cleaning member rotating shaft 6, the element 3, the cleaning member rotating shaft 6, the element 3, the cleaning member 4, and the element support member 19 are pulled in the axial direction. The assembly of the cleaning member 4 and the element support member 19 is extracted from the casing 2. At the time of this extraction, the assembly is supported by the rollers 47 and 48 via the element support member 19, so that when the pulling force is applied to the assembly, the rollers 47 and 48 rotate and the large pulling force is not required. The solid can be pulled out. At this time, the cleaning member rotating shaft 6 and the element rotating shaft 7 are connected by a spline having a cross-sectional structure shown in FIG. 9A, and the element rotating shaft 7 and the seal member 17 are connected in FIG. 9B. Since the shaft key connection of the cross-sectional structure shown in FIG. As described above, the fact that the assembly can be easily pulled out from the casing 2 not only replaces the brush material 43 and the brush material 44, but also facilitates operations such as replacement of other parts and disassembly and cleaning.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. For example, in the above embodiment, the liquid inlet 8 and the liquid outlet 9 are installed on the upper surface of the casing 2, but the present invention is not limited to this, and may be installed on the side surface of the casing 2. Even in this case, it is possible to obtain an equivalent function. Moreover, it is preferable to select whether the elements are arranged horizontally or vertically as necessary.

  In the present invention, the liquid that has flowed into the casing from the liquid inlet is allowed to flow into the element through an opening provided at one end, and the solid matter in the liquid is captured by passing through the pores of the wall surface while flowing through the element. The permeate is allowed to flow out of the liquid outlet, and the cleaning member is rubbed against the inner peripheral surface of the element by the rotation of the rotating shaft to remove the trapped matter adhering to the inner peripheral surface of the element. When the cleaning member passes through the protrusion protruding on the inner peripheral surface of the element, the protrusion is allowed to flow into the casing from the opening provided at the end and discharged to the outside from the trapped material discharge port. Since it is scraped off by the object, the solid material does not remain on the cleaning member, the removal performance of the solid material adhering to the inner peripheral surface of the element of the cleaning member can be maintained in a high state, and the solid material is captured in the permeated liquid by the element function Without reducing available filtration function of the automatic strainer as long term automatic strainer can be maintained.

DESCRIPTION OF SYMBOLS 1 Automatic strainer 2 Casing 3 Element 4 Cleaning member 5 Projection 6 Rotating shaft for cleaning member 7 Rotating shaft for element 8 Liquid inlet 9 Liquid outlet 10 Captured matter outlet 11 Stay and ring 12 Ring 13 Flange 15 Bearing 16 Bearing and bearing And seal member 17 Bearing and seal member 18 Bearing and seal member 19 Element support member 20 Bearing and seal member 21 Bearing 22 Drive unit 23 Coupling 24 Element power transmission half coupling 25 Element power transmission bolt 28 Pressure Detection end 29 Pressure detection end 30 Stand 31 Rotating shaft 32 Connecting rotating shaft 33 Support member 36 Projection mounting plate 37 Projection mounting plate 39 Screw blade 41 Brush 42 Brush mounting plate 43 Brush material 44 Brush material 45 Cleaning port 47 Roller 48 B Troller

Claims (10)

A casing with a liquid inlet, a liquid outlet, and a trap outlet;
A cylindrical element that is rotatably arranged in the casing and has a porous wall surface;
A rotating shaft disposed in the element so as to be rotatable along the axial direction;
A first cleaning member attached to the rotating shaft and having a tip portion rubbing the inner peripheral surface of the element;
A plurality of protrusions arranged in a predetermined axial direction on the inner surface of the element;
A drive device for rotating the rotating shaft,
The liquid that has flowed into the casing from the liquid inlet is allowed to flow from an opening provided at one end into the element, and the solid matter in the liquid is captured by passing through the pores of the wall surface while flowing through the element. The permeate is allowed to flow out of the liquid outlet, and the first cleaning member is rubbed against the inner peripheral surface of the element by the rotation of the rotating shaft to remove the trapped substance adhering to the inner peripheral surface of the element. An object is allowed to flow into the casing from an opening provided at the other end of the element, and is discharged to the outside from the captured object discharge port. Solid matter adhering to the first cleaning member is removed by the first cleaning member. An automatic strainer which is scraped off by the protrusion when passing through the container. The automatic strainer according to claim 1,
The automatic strainer, wherein the plurality of protrusions are arranged in a staggered footprint in an axial direction at a predetermined position on the inner circumferential surface of the element. The automatic strainer according to claim 1 or 2,
The first cleaning member includes screw blades formed at a predetermined spiral pitch in an axial direction fixed to the rotation shaft, and a brush attached to an outer peripheral portion of the screw blades,
An automatic strainer characterized in that the tip of the brush rubs on the inner peripheral surface of the element by the rotation of the rotating shaft and gives a flow thrust to the liquid in the element. The automatic strainer according to claim 3,
The automatic strainer according to claim 1, wherein a plurality of brushes of the first cleaning member are arranged in the longitudinal direction of the outer periphery of the screw blade. The automatic strainer according to any one of claims 1 to 4,
An automatic strainer characterized in that the rotation direction and / or the number of rotations of the rotation shaft by the driving device can be varied. The automatic strainer according to any one of claims 1 to 5,
An automatic strainer comprising a second cleaning member that rubs the outer peripheral surface of the element by the rotation of the element. The automatic strainer according to any one of claims 1 to 6,
An element rotation shaft connected to the element provided concentrically on the outer periphery of the rotation shaft is provided,
An automatic strainer comprising a rotational force transmitting means for connecting the rotational shaft and the element rotational shaft and transmitting the rotational force of the rotational shaft to the element rotational shaft. The automatic strainer according to any one of claims 1 to 6,
The automatic strainer according to claim 1, further comprising one or a plurality of cleaning ports for spraying a cleaning liquid onto an outer peripheral surface of the rotating element at a predetermined position of the casing to clean the entire peripheral surface of the element. The automatic strainer according to any one of claims 1 to 6,
Providing a pressure detection end for detecting the liquid inlet liquid pressure of the casing and the liquid outlet liquid pressure;
A control unit is provided for controlling the rubbing speed of the inner circumferential surface of the first cleaning member by controlling the rotational speed of the rotating shaft by the driving device,
The control unit is configured to control the element of the first cleaning member when a differential pressure between the liquid inlet liquid pressure and the liquid outlet liquid pressure of the casing becomes a first predetermined value or more during operation of the automatic strainer. An automatic strainer characterized by increasing the rubbing speed of the inner peripheral surface and returning the rubbing speed of the inner peripheral surface of the first cleaning member to the original when the differential pressure value returns to the original state. The automatic strainer according to claim 9,
An electromagnetic on-off valve is provided at each of the liquid inlet and the trapped substance outlet,
The control unit controls a rotational speed of the rotating shaft by the driving device to control a sliding speed of the inner circumferential surface of the element of the first cleaning member, and a rubbing that changes a rubbing direction. With direction change function,
When the differential pressure between the liquid inlet liquid pressure of the casing and the liquid outlet liquid pressure becomes equal to or higher than a second predetermined value exceeding the first predetermined value during operation of the automatic strainer, the control unit The electromagnetic on-off valve provided at the liquid inlet and the electromagnetic on-off valve provided at the trapped material discharge port are closed to stop the sliding of the inner peripheral surface of the element by the first cleaning member, and then the cleaning member is moved to a predetermined speed. The inner circumferential surface of the element is rubbed for a predetermined time, and the rubbing direction of the inner circumferential surface of the element is changed by the first cleaning member for a predetermined time. An automatic strainer characterized by having a function to return to the state.

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