JP6894049B2 - Strainer and filtration system - Google Patents

Description

The present invention relates to strainers and filtration systems for removing foreign matter from fluids.

As a technique for removing a foreign substance from a fluid containing a foreign substance, for example, the techniques described in Patent Document 1 and Patent Document 2 have been proposed.

Patent Document 1 discloses a strainer that includes a cylindrical element that is rotatably arranged and has a porous body formed on a wall surface, and captures and separates a solid from a liquid containing a solid by a porous structure. Has been done. In Patent Document 1, a spiral screw blade is fixed to a cylindrical element by welding or the like, a brush is provided on the screw blade, and the inner peripheral surface of the cylindrical element is rubbed with a brush to form a cylindrical shape. The solid adhering to the inner peripheral surface of the element is removed.

Further, Patent Document 1 describes that an assembly of a cleaning member rotating shaft, an element, a cleaning member, and an element support member can be pulled out from a casing to easily replace the brush material.

In Patent Document 2, the outer circumference of the filter element is provided by a filter element for filtering raw water containing sludge, and a scraping portion composed of a brush or a scraper arranged on the outer peripheral side of the filter element and the inner circumference of the filter element. It has a scraping mechanism including a scraping mechanism arranged on the side and a scraping mechanism arranged on the inner peripheral side of the filter element, and both the outer peripheral surface and the inner peripheral surface of the filter element. Disclosed is a structure in which sludge adhering to and grown on the surface is simultaneously scraped off, and the scraped sludge is discharged through a drain pipe.

Japanese Unexamined Patent Publication No. 2012-200624

Japanese Unexamined Patent Publication No. 2012-135729

However, in the configuration of Patent Document 1, although the solid adhering to the cylindrical element is removed by the brush, it is inevitable that the separation performance is deteriorated due to the deterioration of the brush. In addition, if the solid is a pollutant such as a fissile material, the operator may be exposed to the pollutant during the brush replacement operation. Further, in the first place, it is not considered that the deteriorated brush cannot be replaced when the operator cannot approach it, for example, when the strainer is arranged in a narrow place.

Further, in the configuration of Patent Document 2, sludge adhering to the filter element is removed by the scraping mechanism arranged on the outer peripheral side of the filter element and the scraping mechanism arranged on the inner peripheral side of the filter element. It is possible. However, if there is residual sludge that cannot be removed by the brush, or in order to maintain the filter element, the filter element must be removed from the strainer. Therefore, Patent Document 2 does not consider that the deteriorated brush cannot be replaced when the operator cannot approach the strainer, for example, when the strainer is arranged in a narrow place.

The present invention provides a strainer and a filtration system that can maintain the separation performance of removing foreign matter from a fluid containing foreign matter and can be attached even in an environment where it is difficult for an operator to approach such as a narrow place.

In order to solve the above problem, the strainer for removing foreign matter from the introduced fluid according to the present invention has an inlet portion for introducing the fluid containing the foreign matter and the foreign matter introduced from the fluid introduced through the inlet portion. A rewindable filter net for removing the fluid, an outlet for discharging the fluid passing through the rewindable filter net, and a first roller for winding the rewindable filter net by a predetermined length. A shaft and a second roller shaft that pays out a predetermined length of the rewindable filtration net are provided, and the first roller shaft has a predetermined distance between the shaft and the second roller shaft. The rewindable filtration net, which is located opposite and traps the foreign matter, is wound around the first roller shaft, and a new rewindable filtration net is unwound by the second roller shaft , and further. A support member disposed between the first roller shaft and the second roller shaft to support the windable filtration net is provided, and the support member has a frame shape and is windable. two members corresponding to both widthwise ends of the Do filtration network, that have a respective inclined surface inclined in the width direction outside.

Further, the filtration system according to the present invention includes a strainer for removing foreign matter contained in a fluid, an inflow pipe for supplying the fluid containing foreign matter to the strainer, a main fluid line pump connected to the inflow pipe, and the above. A first valve attached to the inflow pipe on the downstream side of the main fluid line pump and on the upstream side of the strainer, an outflow pipe for flowing a fluid from which foreign matter has been removed by the strainer, and removal from the fluid by the strainer. A drain pipe for discharging the foreign matter, a waste collection device for the foreign matter to flow through the drain pipe, and a controller are provided, and the strainer further includes an inlet for introducing a fluid containing the foreign matter, and the above. A rewindable filter net that removes the foreign matter from the fluid introduced through the inlet, an outlet that drains the fluid that has passed through the rewindable filter net, and the rewindable filter net. A first roller shaft that winds by a predetermined length and a second roller shaft that unwinds by a predetermined length of the rewindable filtration net are provided, and the first roller shaft is the second roller shaft. The rewindable filtration net, which is located opposite to the roller shaft with a predetermined distance and has captured the foreign matter, is wound around the first roller shaft and is newly rewoundable. Is fed by the second roller shaft, and further includes a support member disposed between the first roller shaft and the second roller shaft to support the rewindable filtration net, and the support is provided. member has a frame shape, the two members corresponding to both widthwise ends of the winding can filter screen is that having a respective inclined surface inclined in the width direction outside.

According to the present invention, it is possible to provide a strainer and a filtration system that can maintain the separation performance of removing foreign substances from a fluid containing foreign substances and can be installed in an environment where it is difficult for an operator to work in a narrow place or the like. it can.

Issues, configurations and effects other than the above will be clarified by the following description of the embodiments.

It is an overall schematic block diagram of the filtration system by 1st Embodiment of this invention. It is a front view of the strainer shown in FIG. It is sectional drawing of the strainer cut along the line AA shown in FIG. It is a figure explaining the shape of the support member which constitutes the strainer shown in FIG. It is a functional block diagram of the controller shown in FIG. It is a figure which shows the shape of the windable filtration net shown in FIG. It is a figure which shows another shape of the windable filtration net shown in FIG. It is a flowchart of the backwash of the filtration system shown in FIG. It is an overall schematic block diagram of the filtration system by 2nd Embodiment of this invention. It is a vertical cross-sectional view of the strainer shown in FIG. 9 and a cross-sectional view cut along the direction of the fluid flow. It is a figure explaining the shape of the support member which constitutes the strainer shown in FIG.

In the present specification, the foreign matter contained in the fluid includes organic particles, sludge, contaminated particles, etc. when the strainer and filtration system of the present invention are applied to a water treatment system. When the strainer and filtration system of the present invention is applied to a nuclear power plant, the foreign matter contained in the fluid contains dangerous particles such as fissile material. The same applies when the strainer and filtration system of the present invention is applied to a thermal power plant or a pipeline for transporting oil.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an overall schematic configuration diagram of a filtration system according to the first embodiment of the present invention. As shown in FIG. 1, the filtration system 1 includes a strainer 2 for removing foreign matter contained in the fluid, an inflow pipe 9 for supplying the fluid containing the foreign matter to the strainer 2, and a main fluid connected to the inflow pipe 9. The line pump 3, the upstream valve 6 as the first valve attached to the inflow pipe 9 on the downstream side of the main fluid line pump 3 and the upstream side of the strainer 2, and the outflow of the fluid from which foreign matter has been removed by the strainer 2 flows. The pipe 10, the downstream valve 7 as a second valve attached to the outflow pipe 10, and the backwash pump connected to the outflow pipe 10 via a branch pipe on the upstream side of the second valve and on the downstream side of the strainer 2. 4 and.

Further, the filtration system 1 includes a drain pipe 11 that discharges foreign matter removed (separated) from the fluid by the strainer 2, a waste collection device 5 in which the foreign matter flows through the drain pipe 11, and a waste collection device 5. It includes a drain valve 8 which is a third valve attached to the drain pipe 11 on the upstream side and the downstream side of the strainer 2.

In addition, the filtration system 1 controls a strainer 2, a main fluid pump 3, a backwash pump 4, an upstream valve 6 as a first valve, a downstream valve 7 as a second valve, and a drain valve 8. It includes a controller 12, which will be described later.

For example, an electromagnetic valve is used as the upstream valve 6 as the first valve, the downstream valve 7 as the second valve, and the downstream valve 8 as the third valve.

Further, the waste recovery device 5 is a processing device that performs a predetermined treatment on the foreign matter removed (separated) from the fluid by the strainer 2 or a tank that stores the foreign matter removed (separated) from the fluid by the strainer 2. is there.

The main fluid line pump 3 pressurizes the fluid containing foreign matter, and the fluid containing the pressurized foreign matter is introduced into the strainer 2 via the upstream valve 6 as the first valve and the inflow pipe 9.

The backwash pump 4 pressurizes the cleaning liquid or chemical cleaning agent introduced into the outflow pipe 10 via the downstream valve 7 as the second valve, and the pressurized cleaning liquid or pressurized chemical cleaning agent flows out. It is introduced into the strainer 2 via the tube 10. The details of backwashing will be described later.

FIG. 2 is a front view of the strainer 2 shown in FIG. As shown in FIG. 2, the strainer 2 rotatably supports the main housing 21, the first roller shaft 23, the second roller shaft 22, and the first roller shaft 23. The portion 25, the second roller shaft support portion 24 that rotatably supports the second roller shaft 22, the reverse rotation brush 26, the rewindable filtration net 27, the outlet flange 28, and the rewindable portion 25. It includes a support member 29 that supports the filtration net 27, a drain 30, a speed-increasing gear 32 of a reverse rotation brush, and a roller shaft drive unit 31. Since the front view of FIG. 2 is a front view viewed along the flow direction of the fluid containing foreign matter, the outlet flange 28 is located on the back side of FIG. 2 and is shown by a dotted line.

The first roller shaft 23 arranged on the lower side in the vertical direction inside the main housing 21 has inclined surfaces 23a at both ends in the axial direction (both ends in the longitudinal direction). That is, the inclined surface 23a has a shape similar to the shape in which the cone is cut out. That is, the inclined surface 23a has a shape in which the outer diameter of the first roller shaft 23 continuously increases toward the axial end portions (both ends in the longitudinal direction).

The second roller shaft 22 arranged on the upper side in the vertical direction inside the main housing 21 has inclined surfaces 22a at both ends in the axial direction (both ends in the longitudinal direction). That is, the inclined surface 22a has a shape similar to the shape in which the cone is cut off. That is, the inclined surface 22a has a shape in which the outer diameter of the second roller shaft 23 continuously increases toward the axial end portions (both ends in the longitudinal direction).

Outer diameters other than the axially both ends (longitudinal ends) of the first roller shaft 23 having the inclined surface 23a, and the axially both ends (longitudinal) of the second roller shaft 22 having the inclined surface 22a. It is preferable that the outer diameters other than those at both ends) are the same.

The roller shaft drive unit 31 includes a stepping motor or a servomotor (not shown), and rotationally drives the first roller shaft 23 and the second roller shaft 22, or the first roller shaft 23. As a result, the windable filtration net 27, which will be described in detail later, is wound by the first roller shaft 23 by a predetermined length (a predetermined winding amount), and is wound by the second roller shaft 22 by a predetermined length. It is fed out by the amount (predetermined feeding amount). In the example shown in FIG. 2, the windable filtration net 27 is supported and guided by the support member 29, and moves vertically downward by a predetermined length.

In addition, the stepping motor or servomotor (not shown) also rotationally drives the roller shaft (third roller shaft) of the reverse rotation brush 26. That is, the reverse rotation brush 26 has a brush on the outer peripheral surface of the third roller shaft, and the third roller shaft is rotationally driven by a stepping motor or a servomotor (not shown). The outer diameter of the reverse rotation brush 26 is smaller than the outer diameter of the first roller shaft 23 and the second roller shaft 22.

FIG. 3 is a cross-sectional view of the strainer 2 cut along the line AA shown in FIG. As shown in FIG. 3, the first roller shaft 23 and the second roller shaft 22 are separated from each other by a predetermined distance in the vertical direction so as to face each other. Further, the first roller shaft 23 is arranged so as to face the reverse rotation brush 26 in the horizontal direction. When the windable filter net 27 is wound by the first roller shaft 23 by a predetermined length L (a predetermined winding amount), the foreign matter captured by the windable filter net 27 is removed by the reverse rotation brush 26. Is scraped off by. The scraped foreign matter flows by gravity through the drain pipe 11 via the drain 30, and flows into the waste collection device 5 (FIG. 1).

Here, the rotation speed of the roller shaft (third roller shaft) of the reverse rotation brush 26 is faster than the rotation speed of the first roller shaft 23. This makes it possible to efficiently remove the foreign matter trapped by the rewindable filtration net 27 wound by the first roller shaft 23, which is considered to be in a relatively stopped state.

The speed-increasing gear 32 (FIG. 2) of the reverse rotation brush has a plurality of gears, and the rotation speed of the roller shaft (third roller shaft) of the reverse rotation brush 26 is determined according to the selected gear ratio. .. For example, by selecting one gear and setting the outer diameter of the other gear that engages with the selected gear to half (1/2), the roller shaft (third roller shaft) of the reverse rotation brush 26 The rotation speed is doubled. The appropriate rotation speed of the roller shaft (third roller shaft) of the reverse rotation brush 26 can be appropriately set by confirming the brushing efficiency by a test or the like in advance.

As shown in FIG. 3, the main housing 21 of the strainer 2 has an inlet flange 33 on the side where the fluid flows and an outlet flange 28 on the side where the fluid flows out. The inlet flange 33 is watertightly fastened to the inflow pipe 9 by, for example, a bolt. Further, the outlet flange 28 is watertightly fastened to the outflow pipe 10 by, for example, a bolt. That is, the inlet portion (also referred to as an inlet nozzle) of the strainer 2 is connected to the inflow pipe 9 via a joint, and the outlet portion (also referred to as an outlet nozzle) of the strainer 2 is connected to the outflow pipe 10 via a joint. There is.

A rewindable filtration net 27 wound around a first roller shaft 23 and a second roller shaft 22 arranged so as to face each other at a predetermined distance in the vertical direction and supported by a support member 29. Are arranged so as to be orthogonal to the flow direction of the fluid. The windable filtration net 27 is not limited to being arranged so as to be orthogonal to the flow direction of the fluid. The inlet portion (inlet nozzle) of the strainer 2 may be bent, for example, by arranging the inflow pipe 9 connected to the inlet portion (inlet nozzle) of the strainer 2 via a joint. In this case, the windable filtration net 27 is arranged so as to have a predetermined angle with respect to the direction of the fluid flow. By inclining the windable filtration net 27 so as to have a predetermined angle with respect to the flow direction of the fluid depending on the fluid, it may be possible to more efficiently capture foreign substances contained in the fluid. ..

The first roller shaft 23 and the second roller shaft 22, which are separated from each other by a predetermined distance in the vertical direction and face each other, are both drive rollers. That is, the first roller shaft 23 and the second roller shaft 22 are synchronously and rotationally driven by a stepping motor or a servomotor (not shown) provided in the roller shaft drive unit 31 (FIG. 2). The rotation speed of the first roller shaft 23 and the rotation speed of the second roller shaft 22 are the same. In this way, by using both the first roller shaft 23 and the second roller shaft 22 as drive rollers, a rewindable filtration net that is wound around the first roller shaft 23 and the second roller shaft 22. The tension of 27 can be controlled with high accuracy. The rewindable filtration net 27 in which the foreign matter contained in the fluid is captured is wound by the first roller shaft 23 by a predetermined winding amount (predetermined length L). Similarly, the new rewindable filtration net 27 (for which foreign matter contained in the fluid is not captured) is unwound by the second roller shaft 22 in a predetermined feeding amount (predetermined length L). Instead of using the first roller shaft 23 and the second roller shaft 22 as drive rollers, the following structure may be adopted.

That is, the first roller shaft 23 may be a driving roller, and the second roller shaft 22 may be a driven roller. In this case, for example, one end of the spring is fixed to the axial center and both ends (both ends in the longitudinal direction) of the second roller shaft 22 which is a driven roller, and the other end of the spring is fixed to the fixed base. You can do it. By urging the spring in the opposite direction, the tension of the windable filter net 27 is controlled. Further, both ends of the first roller shaft 23, which is a drive roller, in the axial direction are transmitted on the endless belt so that the rotational force of the first roller shaft 23 is transmitted to the second roller shaft 22 via the endless belt. Both ends in the longitudinal direction (both ends in the longitudinal direction) and both ends in the axial direction (both ends in the longitudinal direction) of the second roller shaft 22 which is a driven roller are formed.

The retractable filter net 27 is made of, for example, stainless steel. The constituent material of the windable filtration net 27 is not limited to stainless steel, and can be appropriately selected depending on the physical properties of the captured foreign matter and fluid. For example, in the case of a corrosive fluid, a suitable metallic material, a metallic material coated with a non-metallic material, a non-metallic material, or the like is selected depending on the chemical properties of the corrosive fluid. In addition, if the foreign matter contains a high concentration of fissile material, it is desirable to use a metallic material such as stainless steel.

FIG. 4 is a diagram illustrating the shape of the support member constituting the strainer shown in FIG. In FIG. 4, the upper left figure shows a perspective view of the support member 29, the upper right figure shows a front view of the support member 29, the lower left figure shows a side view of the support member 29, and the lower right figure shows the support member 29. The top view of 29 is shown. The front view of the support member 29 is a front view when viewed along the flow direction of the fluid. As shown in the perspective view of FIG. 4, the support member 29 has a frame shape. The support member 29 is composed of two members vertically erected on the inflow side of the fluid, two horizontal members connecting the vertical ends of both of these two members, and fluid from both ends of the two members. It is provided with a pair of members (legs) that stand upright and extend in parallel with the flow direction of.

Further, as shown in the front view of FIG. 4, the support member 29 is composed of two members that stand upright in the vertical direction and two members in the horizontal direction that connect both ends of the two members in the vertical direction. It forms a rectangular opening. By forming the support member 29 in a frame shape in this way, the fluid containing the foreign matter pressurized by the main fluid line pump 3 and the fluid containing the foreign matter pressurized are wound on the support member 29. Pressure loss can be reduced as it passes through the available filtration net 27. As shown in the external perspective view and the top view of FIG. 4, the two vertically erecting members constituting the support member 29 face the outer end in the width direction so as to face the fluid flow direction, respectively. It has an inclined surface 29a that protrudes from the surface. That is, the inclined surface 29a has a shape such that the distance between the two members rising in the vertical direction increases toward the outside, or the inclined surface 29a faces the outside in the width direction of the member standing in the vertical direction. It has an inclined shape. As a result, both ends of the windable filter net 27 in the width direction (direction orthogonal to the winding direction) come into contact with the inclined surface 29a of the support member 29, and the windable filter net 27 is in the width direction. It is possible to prevent foreign matter trapped in the filtration net 27 that can be wound from both ends (direction orthogonal to the winding direction) from leaking to the downstream side.

The inclination angles of the inclined surface 29a are the inclination angles of the inclined surfaces 23a formed at both ends in the axial direction (both ends in the longitudinal direction) of the first roller shaft 23 and both ends in the axial direction of the second roller shaft 22 (both ends in the longitudinal direction). It is almost the same as the inclination angle of the inclined surface 22a formed on both ends in the longitudinal direction. As a result, at the time of winding by the first roller shaft 23 of the rewindable filtration net 27 (when unwinding by the second roller shaft 22 of the rewindable filtration net 27), the rewindable filtration net 27 becomes It is possible to prevent bending from occurring.

The support member 29 is made of, for example, stainless steel. The material of the support member 29 is not limited to stainless steel, and can be suitably selected according to the physical characteristics of the fluid. For example, in the case of a corrosive fluid, a suitable metallic material, a metallic material coated with a non-metallic material, a non-metallic material, or the like is selected depending on the chemical properties of the corrosive fluid. In addition, if the foreign matter contains a high concentration of fissile material, it is desirable to use a metallic material such as stainless steel. It is preferable that the constituent material of the support member 29 is high-strength stainless steel in consideration of the pressure loss and the decrease in pressure resistance when the fluid containing the pressurized foreign matter passes through.

FIG. 5 is a functional block diagram of the controller 12 of FIG. First, although not shown in FIGS. 2 and 3, the strainer 2 includes a tension sensor for measuring the tension of the rewindable filtration net 27, and an inlet (inlet nozzle) side and an outlet (outlet) of the strainer 2. Various sensors 34 such as a pressure sensor (fluid pressure sensor) for measuring the differential pressure on the nozzle) side, a rotation angle sensor for measuring the rotation angle of the first roller shaft 23 and the rotation angle of the second roller shaft 22 are attached. ing. When the motor attached to the roller shaft drive unit 31 is a servomotor, as various sensors 34, a position detector such as a potentiometer and a speed detector such as a tacho generator are attached to the strainer 2.

As shown in FIG. 5, the controller 12 includes a tension control unit 41, a winding amount control unit 42, a winding timing control unit 43, a backwash control unit 44, a storage unit 45, an input IF 46, and an output. It comprises an IF47 and a communication IF48, which are accessible to each other via the internal bus 49. The tension control unit 41, the winding amount control unit 42, the winding timing control unit 43, and the backwash control unit 44 store a processor such as a central processing unit (CPU) (not shown) and various programs. It is realized by a ROM, a RAM that temporarily stores operation processing data, and an external storage device. In addition, a processor such as a CPU reads and executes various programs stored in the ROM, and stores the calculation result in the RAM or an external storage device as the execution result. The tension control unit 41, the winding amount control unit 42, the winding timing control unit 43, and the backwash control unit 44 are shown as being divided into a single functional block. The processor may be an arithmetic unit or may be configured to integrate the desired functional blocks.

The input IF 46 inputs the tension measurement value of the filtration net 27 that can be wound up from the tension sensor as the sensor 34, transmits the measurement value to the tension control unit 41 via the internal bus 49, and transmits the measurement value to the predetermined storage unit 45. It is stored in the storage area of. Further, the input IF46 inputs the rotation angle measurement values of the first roller shaft 23 and the second roller shaft 22 from the rotation angle sensor, transmits the measurement values to the tension control unit 41 via the internal bus 49, and measures the measurement. The value is stored in a predetermined storage area of the storage unit 45. The input IF46 receives a measured value of the differential pressure between the inlet (inlet nozzle) side and the outlet (outlet nozzle) side of the strainer 2 from the pressure sensor (fluid pressure sensor), and measures the differential pressure via the internal bus 49. The value is transmitted to the winding timing control unit 43, and the measured value of the differential pressure is stored in a predetermined storage area of the storage unit 45. When the motor attached to the roller shaft drive unit 31 is a servomotor, the input IF46 inputs the measured value from a position detector such as a potentiometer and sets the measured value via the internal bus 49 in the winding amount control unit 42. And stores the measured value in a predetermined storage area of the storage unit 45. Further, the measured value of the differential pressure between the inlet (inlet nozzle) side and the outlet (outlet nozzle) side of the strainer 2 from the pressure sensor (fluid pressure sensor) is also transmitted to the backwash control unit 44 via the internal bus 49. Will be done. The measurement of the differential pressure between the inlet portion (inlet nozzle) side and the outlet portion (outlet nozzle) side of the strainer 2 by the pressure sensor (fluid pressure sensor) is performed at a predetermined cycle.

The tension control unit 41 can wind up based on the tension measurement value of the windable filtration net 27 transmitted from the input IF 46 and the rotation angle measurement value of the first roller shaft 23 and the second roller shaft 22. A control command is output to the roller shaft drive unit 31 via the output IF 47 so that the tension of the filtration net 27 is within an appropriate tension tolerance range. The control command output here is a pulse width modulation (PWM) voltage signal when the motor attached to the roller shaft drive unit 31 is a servomotor, and is the first roller shaft 23 or the second roller shaft 22. Is driven to rotate at a rotation angle corresponding to the PWM voltage signal. When the motor attached to the roller shaft drive unit 31 is a stepping motor, a drive pulse is output as a control command, and the first roller shaft 23 or the second roller shaft 22 is rotationally driven in response to the drive pulse. .. Appropriate tension tolerances of the windable filter net 27 may be measured. For example, it is tested in advance to measure the corresponding tension of the windable filtration net 27 and stored in the storage unit 45.

The winding timing control unit 43 determines whether or not the measured value of the differential pressure between the inlet (inlet nozzle) side and the outlet (outlet nozzle) side of the strainer 2 transmitted from the input IF 46 exceeds a predetermined first threshold value. When the value exceeds a predetermined first threshold value, the amount of foreign matter trapped in the windable filter net 27 reaches a predetermined amount, so that the windable filter net 27 is wound. However, it is determined that the separation performance for removing foreign matter has been reduced, and a winding start command is output to the winding amount control unit 42 via the internal bus 49. In the present embodiment, the winding timing control unit 43 outputs a winding start command based on the measured value of the differential pressure between the inlet portion (inlet nozzle) side and the outlet portion (outlet nozzle) side of the strainer 2. However, the present invention is not limited to this. For example, instead of the pressure sensor (fluid pressure sensor), a flow velocity sensor for measuring the flow velocity of the fluid is provided as a sensor 34, and the winding amount control unit 42 starts winding based on the measured value of the flow velocity by the flow velocity sensor. It may be configured to output a command.

In response to the winding start command from the winding timing control unit 43, the winding amount control unit 42 sets the winding amount to a predetermined winding amount (predetermined length L) and a predetermined feeding amount (predetermined length). L), the winding amount control unit 42 outputs the corresponding control command to the roller shaft drive unit 31 via the output IF 47. Here, when the motor attached to the roller shaft drive unit 31 is a servomotor, the winding amount control unit 42 controls a PWM voltage signal corresponding to a predetermined winding amount (predetermined length L). The winding amount control unit 42 rotationally drives the first roller shaft 23 at a rotation speed corresponding to the PWM voltage signal. The winding amount control unit 42 outputs a PWM voltage signal corresponding to a predetermined feeding amount (predetermined length L) to the servomotor as a control command, and the winding amount control unit 42 corresponds to the PWM voltage signal. The second roller shaft 22 is rotationally driven at the number of rotations to be performed. When the motor attached to the roller shaft drive unit 31 is a stepping motor, the winding amount control unit 42 outputs a drive pulse corresponding to a predetermined winding amount (predetermined length L) to the stepping motor as a control command. Then, the winding amount control unit 42 rotationally drives the first roller shaft 23 at a rotation speed corresponding to the drive pulse. The winding amount control unit 42 outputs a drive pulse corresponding to a predetermined feeding amount (predetermined length L) to the stepping motor as a control command, and the winding amount control unit 42 has a rotation speed corresponding to the drive pulse. The second roller shaft 22 is rotationally driven. However, if there is a difference in the rotation speeds of the first roller shaft 23 and the second roller shaft 22 when the windable filter net 27 is wound, the tension of the windable filter net 27 may fluctuate. There is. Therefore, the take-up filter net 27 is based on the tension measurement value of the take-up filter net 27 transmitted from the input IF 46 and the rotation angle measurement value of the first roller shaft 23 and the second roller shaft 22. Feedback control is executed by outputting a control command to the roller shaft drive unit 31 via the output IF 47 so that the tension of the above is within an appropriate tension tolerance range.

When the first roller shaft 23 is a drive roller and the second roller shaft 22 is a driven roller, the winding amount control unit 42 determines the servomotor that rotationally drives the first roller shaft 23. The PWM voltage signal corresponding to the feeding amount (predetermined length L) of is output as a control command. Alternatively, the winding amount control unit 42 outputs a drive pulse corresponding to a predetermined feeding amount (predetermined length L) to the stepping motor that rotationally drives the first roller shaft 23 as a control command.

Further, in response to the winding start command from the winding timing control unit 43, the winding amount control unit 42 outputs a control command to the roller shaft drive unit 31 via the output IF 47, and the reverse rotation brush 26 described above. The roller shaft (third roller shaft) of the above is rotated by a servo motor or a stepping motor.

It is desirable that the winding operation of the take-up filter net 27 described above is performed while the inflow of the fluid containing foreign matter into the strainer 2 is stopped. Therefore, the winding amount control unit 42 outputs a stop command to the main fluid line pump 3 via the output IF 47, and outputs a control command for closing the upstream valve 6 as the first valve.

Between the inlet (inlet nozzle) side and the outlet (outlet nozzle) side of the strainer 2 transmitted from the input IF 46 by winding all of the rewindable filtration net 27 that can be wound by the first roller shaft 23. When the measured value of the differential pressure exceeds a predetermined first threshold value, the backwash control unit 44 operates. The backwash control unit 44 outputs a stop command to the main fluid line pump 3 via the output IF 47, and outputs a control command for closing the upstream valve 6 as the first valve. Then, the backwash control unit 44 outputs a drive command to the backwash pump 4 via the output IF 47, and the backwash pump 4 is introduced into the outflow pipe 10 through the downstream valve 7 as the second valve. The cleaning liquid or chemical cleaning agent is pressurized, and the pressurized cleaning liquid or chemical cleaning agent is introduced into the strainer 2 via the outflow pipe 10. The pressurized cleaning liquid or the pressurized chemical cleaning agent introduced into the strainer 2 is used to remove foreign substances trapped in the filter net 27 which can be wound up by the hydraulic cleaning of the cleaning liquid or the chemical cleaning of the chemical cleaning agent. The used and removed foreign matter is discharged to the waste collection device 5 via the drain 30 and the drain pipe 11 by gravity. As a result, the rewindable filter net 27 is regenerated, so that the operator does not need to replace the rewindable filter net 27. The backwash control unit 44 executes the above operation with a predetermined winding amount (predetermined length L). The backwash control unit 44 stores historical data such as the number of backwashes in a predetermined storage area of the storage unit 45 via the internal bus 49, and the backwash control unit 44 stores historical data such as the number of backwash operations. , The data is transmitted to the central control room 51 or the control panel 52 via the communication IF48. As a result, the operator (operator) can check the displayed historical data such as the number of backwash operations and easily determine that the backwash frequency has reached the set number of times. Basically, even if it is not necessary to replace the windable filter net 27, by backwashing the windable filter net 27 for a long period of time and using it repeatedly, for example, the windable filter net 27 can be used. It is possible to determine the need to replace the rewindable filtration net 27 in the event of a failure. The details of the operation flow during backwashing will be described later.

FIG. 6 is a diagram showing the shape of the rewindable filtration net 27 shown in FIG. FIG. 6 shows the moving direction of the rewindable filtration net 27, that is, the winding direction by the first roller shaft 23, which is indicated by the white arrow. The windable filtration net 27 shown in FIG. 6 has a magnetic material 61 at both ends in the width direction and at positions corresponding to a predetermined length L along the longitudinal direction. That is, the magnetic body 61 is arranged at a distance of a predetermined length L between two stainless steel plates to which the mesh portion is fixed. In this case, the mesh size of the mesh portion is appropriately set within the range of, for example, 20 mm to 100 mm. Since the mesh size of the mesh portion depends on the average outer diameter and pressure loss of the captured foreign matter, it may be appropriately set based on the average outer diameter and pressure loss of the foreign matter.

As described above, when the filter net 27 that can be wound by the first roller shaft 23, or the first roller shaft 23 and the second roller shaft 22, is wound by a predetermined length L, it has a predetermined length. The winding of the L is detected by detecting the position of the magnetic body 61, and the rotational operation of the servomotor or stepping motor attached to the roller shaft drive unit 31 is stopped.

In this way, by arranging the magnetic bodies 61 at both ends in the width direction of the windable filter net 27 at intervals corresponding to the predetermined length L, the PWM voltage signal corresponding to the predetermined length L is signaled. The position of the rewindable filtration net 27 is set with higher control accuracy than the control of the servomotor by the above and the control of the stepping motor by the drive pulse corresponding to the predetermined length L.

FIG. 7 is a diagram showing another shape of the rewindable filtration net 27 shown in FIG. FIG. 7 shows the moving direction of the rewindable filtration net 27, that is, the winding direction by the first roller shaft 23, which is indicated by the white arrow. As shown in FIG. 7, the take-up filter net 27 has notches 62 at both ends of the take-up filter net 27 in the width direction corresponding to a predetermined length L along the longitudinal direction. .. That is, the notch 62 is formed on the thin plate-shaped stainless steel plate that fixes the mesh portions at predetermined length L intervals. In this case, the mesh size of the mesh portion is appropriately set within the range of, for example, 20 mm to 100 mm. Since the mesh size of the mesh portion depends on the average outer diameter and pressure loss of the captured foreign matter, it may be appropriately set based on the average outer diameter and pressure loss of the foreign matter.

As described above, when the first roller shaft 23, or the filtration net 27 that can be wound by the first roller shaft 23 and the second roller shaft 22 is wound by a predetermined length L, the main housing 21 is wound. The position of the notch 62 was detected by fitting the notch 62 into the provided convex portion (not shown) and detecting the winding of a predetermined length L, and the notch 62 was attached to the roller shaft drive unit 31. Stop the rotation of the servo motor and stepping motor.

In this way, by forming notches 62 at both ends in the width direction of the windable filter net 27 at intervals corresponding to the predetermined length L, the PWM voltage signal corresponding to the predetermined length L is used. Compared with the control of the servomotor and the control of the stepping motor by the drive pulse corresponding to the predetermined length L, the position of the rewindable filtration net 27 is set with higher control accuracy.

Next, the operation flow during backwashing of the filtration system 1 according to the present embodiment will be described. FIG. 8 is a flowchart of backwashing of the filtration system shown in FIG. As described above, in the backwash, all of the rewindable filtration nets 27 that can be wound by the first roller shaft 23 are wound, and the strainer 2 has an inlet (inlet nozzle) side and an outlet (outlet nozzle). This is performed when the measured value of the differential pressure on the) side exceeds the first threshold value.

In step S11, the backwash control unit 44 constituting the controller 12 outputs a stop command to the main fluid line pump 3 via the output IF 47, and outputs a control command to close the upstream valve 6 as the first valve. At this time, the downstream valve 7 which is the second valve and the drain valve 8 which is the third valve are maintained in an open state.

In step S12, the backwash control unit 44 drives the backwash pump 4 by outputting a drive command to the backwash pump 4 via the output IF 47. The backwash pump 4 pressurizes the cleaning liquid or chemical cleaning agent introduced into the outflow pipe 10 via the downstream valve 7 as the second valve, and pressurizes the pressurized cleaning liquid or chemical cleaning agent. It is introduced into the strainer 2 via the outflow pipe 10. The pressurized cleaning liquid or the pressurized chemical cleaning agent introduced into the strainer 2 was removed by the water pressure of the cleaning liquid or by chemical cleaning with the chemical cleaning agent, and was captured by the rewindable filtration net 27. The foreign matter is removed, and the removed foreign matter is discharged to the waste collection device 5 via the drain 30 and the drain pipe 11 by gravity.

In step S13, the backwash control unit 44 determines whether or not a predetermined time has elapsed. If it is determined that the predetermined time has elapsed, the process proceeds to step S14. On the other hand, if it is determined that the predetermined time has not elapsed, the process returns to step S12 and the backwash is continued.

In step S14, the backwash control unit 44 outputs a stop command to the backwash pump 4 via the output IF 47, and outputs a control command for opening the upstream valve 6 as the first valve. At this time, the downstream valve 7 which is the second valve and the drain valve 8 which is the third valve are maintained in an open state.

In step S15, the main fluid line pump 3 is driven by the backwash control unit 44 that outputs a drive command to the main fluid line pump 3 via the output IF 47. The main fluid line pump 3 pressurizes the fluid containing foreign matter, and introduces the fluid containing foreign matter to the strainer 2 via the inflow pipe 9 and the upstream valve 6 as the first valve.

In step S16, in the backwash control unit 44, the measured value of the differential pressure between the inlet portion (inlet nozzle) side and the outlet portion (outlet nozzle) side of the strainer 2 transmitted from the input IF 46 is a predetermined threshold value (predetermined second). It is determined whether or not the threshold value of) is exceeded. As a result of this determination, when the measured value of the differential pressure exceeds the second threshold value, the process returns to step S12, and the operations from step S12 to step S16 are repeatedly executed. On the other hand, as a result of the determination, when the measured value of the differential pressure is equal to or less than a predetermined second threshold value, the backwash control unit 44 completes backwashing of the rewindable filtration net 27 to a predetermined length L. , Judge that the backwash operation is completed. The predetermined second threshold value is set to a value smaller than the predetermined first threshold value.

The above-mentioned operations from step S11 to step S16 are performed on the entire region of the rewindable filtration net 27. That is, when the backwash control unit 44 detects in step S16 above that the backwash of the windable filtration net 27 for a predetermined length L is completed, the backwash control unit 44 constitutes the controller 12. A detection signal is output to the winding amount control unit 42 via the internal bus 49. The winding amount control unit 42 responds to a predetermined winding amount (predetermined length L) and a predetermined feeding amount (predetermined length L) in response to a detection signal input from the backwash control unit 44. Then, a control command is output to the roller shaft drive unit 31 via the output IF 47.

When the motor attached to the roller shaft drive unit 31 is a servomotor, the winding amount control unit 42 uses a PWM voltage signal corresponding to a predetermined winding amount (predetermined length L) as a control command to the servomotor. The second roller shaft 22 is rotated at a rotation speed corresponding to the PWM voltage signal. The winding amount control unit 42 outputs a PWM voltage signal corresponding to a predetermined feeding amount (predetermined length L) to the servomotor as a control command, and the first roller at a rotation speed corresponding to the PWM voltage signal. Drive the shaft 23. When the motor attached to the roller shaft drive unit 31 is a stepping motor, the winding amount control unit 42 sets a drive pulse corresponding to a predetermined winding amount (predetermined length L) as a control command, and the first The roller shaft 22 of 2 is rotated by the number of rotations corresponding to the drive pulse. The winding amount control unit 42 outputs a drive pulse corresponding to a predetermined feeding amount (predetermined length L) to the stepping motor as a control command, and the first roller shaft 23 rotates by the number of rotations corresponding to the drive pulse. Will be done. If there is a difference in the number of rotations of the first roller shaft 23 and the second roller shaft 22 during the winding of the rewindable filter net 27, the tension of the rewindable filter net 27 may change. .. Therefore, the tension control unit 41 calculates the tension measurement value of the windable filtration net 27 transmitted from the input IF 46 and the rotation angle measurement value of the first roller shaft 23 and the second roller shaft 22, and winds up. Feedback control is performed by outputting a control command to the roller shaft drive unit 31 via the output IF 47 so that the possible tension of the filtration network 27 is within the allowable tension value range. After that, the operations from step S11 to step S16 are performed in the same manner.

Therefore, once the backwashing of all areas of the rewindable filter net 27 is complete, the regenerated rewindable filter net 27 can be completely wound and wound on the second roller shaft 22. The strainer 2 removes the foreign matter again from the fluid containing the foreign matter without replacing the filter net 27.

As described above, according to the present embodiment, the strainer that can be attached in an environment where it is difficult for an operator to approach, such as a narrow place, can maintain the separation performance of removing foreign matter from the fluid containing foreign matter. It is possible to provide a filtration system.

According to the present embodiment, the first roller shaft 23 and the second roller shaft 22 can automatically supply a new windable filtration net 27.

Further, according to the present embodiment, even if the new windable filtration net 27 is finally wound by the first roller shaft 23, the first roller shaft 23 and the second roller shaft 22 are rotated in opposite directions. By reversing and rotating the strainer 2, the rewindable filtration net 27 can be regenerated, and the life of the strainer 2 can be extended.

FIG. 9 is an overall schematic configuration diagram of the filtration system 1a according to the second embodiment of the present invention. In the first embodiment, the fluid containing the foreign matter flows into the strainer in the horizontal direction. On the other hand, in the present embodiment, the fluid containing the foreign matter flows into the strainer in the vertical direction, and the shape of the support member is different from that of the first embodiment. In the following description, the same components as those in the first embodiment are designated by the same reference numerals, and the description overlapping with the first embodiment will be omitted.

As shown in FIG. 9, in the filtration system 1a of the present embodiment, the fluid containing the foreign matter pressurized by the main fluid line pump 3 causes the inflow pipe 9 and the upstream valve 6 as the inflow as the first valve 6. It flows into the strainer 2a in the vertical direction through the filter. The fluid containing the foreign matter introduced into the strainer 2a is removed from the foreign matter and flows out in the vertical direction through the outflow pipe 10 and the downstream valve 7 as the second valve.

The foreign matter removed by the strainer 2a is vertically discharged to the waste collection device 5 via the drain pipe 11 and the drain valve 8 as the third valve.

FIG. 10 is a vertical cross-sectional view of the strainer 2a shown in FIG. 9, which is a cross-sectional view cut along the flow direction of the fluid. As shown in FIG. 10, the first roller shaft 63 (right side) and the second roller shaft 64 (left side) are arranged so as to face each other at a predetermined distance in the horizontal direction. The foreign matter trapped in the windable filter net 27 is collected when the windable filter net 27 is wound by the first roller shaft 63 by a predetermined length L (a predetermined winding amount). , Scraped by the reverse rotation brush 26. The scraped foreign matter flows into the waste collection device 5 (FIG. 9) through the drain pipe 11 via the drain 30 due to gravity.

Here, the rotational speed of the roller axis of the counter-rotating brushes 26 (third rotor roller shaft) is faster than the rotational speed of the first roller shaft 63. This makes it possible to efficiently remove the foreign matter trapped in the rewindable filtration net 27 wound by the first roller shaft 63, which is considered to be stationary with respect to each other.

The rewindable filtration net 27 wound around the first roller shaft 63 and the second roller shaft 64 facing each other at a predetermined distance in the horizontal direction and supported by the support member 29 is a fluid flow. It is arranged so as to be orthogonal to the direction. The windable filtration net 27 is not limited to a configuration orthogonal to the flow direction of the fluid. For example, the inlet portion (inlet nozzle) of the strainer 2a may be bent by pulling the inflow pipe 9 connected to the inlet portion (inlet nozzle) of the strainer 2a through a joint. In this case, the windable filtration net 27 is arranged so as to have a predetermined angle with respect to the flow direction of the fluid. In addition, depending on the fluid, the rewindable filtration net 27 can be arranged so as to have a predetermined angle with respect to the flow direction of the fluid, so that foreign matter contained in the fluid can be captured more efficiently. It is possible.

The first roller shaft 63 and the second roller shaft 64, which are separated from each other by a predetermined distance in the horizontal direction and face each other, are both drive rollers. That is, the first roller shaft 63 and the second roller shaft 64 are synchronously driven by a stepping motor or a servomotor (not shown) provided in the roller shaft drive unit 31 (not shown). The rotation speed of the first roller shaft 63 and the rotation speed of the second roller shaft 64 are the same. In this way, by using both the first roller shaft 63 and the second roller shaft 64 as drive rollers, a rewindable filtration net wound around the first roller shaft 63 and the second roller shaft 64. 27 can be controlled with high accuracy. The rewindable filtration net 27 in which foreign matter is trapped in the fluid is wound by the first roller shaft 63 with a predetermined winding amount (predetermined length L). Similarly, the new rewindable filtration net 27 (for which foreign matter contained in the fluid is not captured) is unwound by the second roller shaft 64 with a predetermined feeding amount (predetermined length L). Instead of using the first roller shaft 63 and the second roller shaft 64 as drive rollers, the following structure may be adopted.

That is, the first roller shaft 63 may be a driving roller, and the second roller shaft 64 may be a driven roller. In this case, for example, one end of the spring is fixed to the axial center and both ends (both ends in the longitudinal direction) of the second roller shaft 64, which is a driven roller, and the other end of the spring is fixed to the fixed base. You can do it. By urging the spring in the opposite direction, the tension of the windable filter net 27 is controlled. Further, both ends of the first roller shaft 63 as a drive roller in the axial direction are transmitted on the endless belt so that the rotational force of the first roller shaft 63 is transmitted to the second roller shaft 64 via the endless belt. Both ends in the longitudinal direction (both ends in the longitudinal direction) and both ends in the axial direction of the second roller shaft 64 as a driven roller (both ends in the longitudinal direction) are formed.

FIG. 11 is a diagram illustrating the shape of the support member constituting the strainer 2a shown in FIG. In FIG. 11, the upper left view shows a perspective view of the support member 29, the upper right view shows a front view of the support member 29, and the lower left view is a side view of the support member 29 as viewed from the front side of the perspective view. The side view is shown, and the lower right view shows the side view of the support member 29 seen from the right side in the perspective view. The front view of the support member 29 is a front view when viewed along the flow direction of the fluid. As shown in the perspective view of FIG. 11, the support member 29 has a frame shape. The support member 29 includes two members that are separated in the horizontal direction and extend to the side through which the fluid flows, two members in the horizontal direction that connect the two ends of the two members in the horizontal direction, and two members in the horizontal direction that are separated from each other in the direction of the fluid. It is composed of two members extending apart from each other (legs) extending parallel to the direction of fluid flow (vertical direction) from both ends. As shown in the front view of FIG. 11, the support member 29, and two members extending in the horizontal direction, is composed of two members extending horizontally, the opening of the four rectangular connects the two ends It is formed by two intersecting members in addition to the two horizontal members. As described above, since the support member 29 has two intersecting members, a fluid containing a pressurized foreign substance is applied to the support member 29 as compared with the support member 29 of the first embodiment. Be supported. Although the pressure loss when the fluid containing the pressurized foreign matter passes through the rewindable filtration net 27 supported by the support member 29 increases to some extent, the bending prevention effect of the rewindable filtration net 27 is improved. This makes it possible to improve the strength of the support member 29.

As shown in the perspective view of FIG. 11 and the side view on the lower right, the two members provided horizontally separated from each other on the side where the fluid constituting the support member 29 flows are arranged in the width direction and are outside. It has an inclined surface 29a that protrudes toward the end so as to face the flow direction of the fluid. That is, the inclined surface 29a has a shape like a gap between two horizontally separated members provided on the side where the fluid flows when viewed from above, and the width of the members extending so as to be separated from each other in the axial direction. It is formed in a shape that is inclined outward in the direction. Therefore, both ends of the windable filter net 27 in the width direction (direction orthogonal to the winding direction) abut on the inclined surface 29a of the support member 29 and are captured by the windable filter net 27. It is possible to prevent foreign matter from leaking to the downstream side from both ends of the filter net 27 that can be wound in the width direction (direction orthogonal to the winding direction).

The inclination angles of the inclined surface 29a are the inclination angles of the inclined surfaces 23a formed at both ends in the axial direction (both ends in the longitudinal direction) of the first roller shaft 63 and both ends in the axial direction of the second roller shaft 64 (both ends in the longitudinal direction). It is almost the same as the inclination angle of the inclined surface 22a formed on both ends in the longitudinal direction. As a result, at the time of winding by the first roller shaft 63 of the rewindable filtration net 27 (when unwinding by the second roller shaft 64 of the rewindable filtration net 27), the rewindable filtration net 27 becomes It is possible to prevent bending from occurring.

Since the configuration and operation of the controller 12 and the operation flow of the filtration system 1a during backwashing are the same as those in the first embodiment, the description thereof will be omitted.

According to the above-described embodiment, in addition to the effect of the first embodiment, the effect of preventing the windable filtration net 27 from bending can be improved, and the strength of the support member 29 can be improved.

The moving direction of the rewindable filtration net 27 capable of rolling the member having the inclined surface 29a of the member constituting the frame-shaped support member 29 shown in the first embodiment and the second embodiment described above (the moving direction of the rewindable filtration net 27. Winding direction). The length may be variable in a direction parallel to the moving direction (winding direction). In this case, the tension of the windable filtration net 27 can be adjusted by adjusting the length of the member having the inclined surface 29a with an actuator or the like.

The member having the inclined surface 29a of the member constituting the frame-shaped support member 29 shown in the first embodiment and the second embodiment described above is folded back at the outer end, and is between the folded-back portion and the inclined surface 29a. Both ends of the rewindable filtration net 27 in the width direction, which can be wound by the above, may be configured to be movable.

As a result, foreign matter trapped in the windable filter net 27 is prevented from leaking to the downstream side from both ends in the width direction (direction orthogonal to the winding direction) of the windable filter net 27. .. It is possible to further improve the effect.

Further, the mesh portion of the rewindable filtration net 27 shown in the first embodiment and the second embodiment may be a porous plate. In this case, since the size of the hole depends on the average outer diameter of the captured foreign matter and the pressure loss, it may be appropriately set based on the average outer diameter of the foreign matter and the pressure loss.

The present invention is not limited to the above-described embodiment, and various modifications are included in the present invention. For example, although embodiments have been described in detail for ease of description of the invention, the invention is not limited to embodiments that include all of the described configurations. In addition, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, or the configuration of one embodiment can be added to the configuration of another embodiment. In addition, it is possible to add, delete, replace, or the like with respect to a part of the configuration of each embodiment.

1, 1a Filtration system 2, 2a Strainer 3 Main fluid line pump 4 Backwash pump 5 Waste collection device 6 Upstream valve 7 Downstream valve 8 Drain valve 9 Inflow pipe 10 Outflow pipe 11 Drain pipe 12 Controller 21 Main housing 22, 64th 2 Roller shaft 22a Inclined surface 23, 63 1st roller shaft 23a Inclined surface 24 2nd roller shaft support 25 1st roller shaft support 26 Reverse rotation brush 27 Rewindable filtration net 28 Outlet flange 29 Support member 29a Inclined surface 30 Drain 31 Roller shaft drive unit 32 Speed-up gear for reverse rotation brush 33 Inlet flange 34 Sensor 41 Tension control unit 42 Winding amount control unit 43 Winding timing control unit 44 Backwash control unit 45 Storage unit 46 Input IF
47 output IF
48 Communication IF
49 Internal bus 51 Central control room 52 Control panel 61 Magnetic material 62 Notch

Claims (17)

A strainer that removes foreign matter from the introduced fluid.
The inlet for introducing fluid containing foreign matter and
A rewindable filtration net that removes the foreign matter from the fluid introduced through the inlet.
An outlet for draining the fluid through the rewindable filtration net, and
A first roller shaft that winds a predetermined length of the windable filtration net, and
A second roller shaft, which feeds out the rewindable filtration net by a predetermined length, is provided.
The first roller shaft is located opposite to the second roller shaft at a predetermined distance, and the rewindable filtration net that has captured the foreign matter is the first roller shaft. A new rewindable filtration net is unwound by the second roller shaft .
Further, a support member disposed between the first roller shaft and the second roller shaft to support the windable filtration net is provided.
Wherein the support member has a frame shape, the two members corresponding to both widthwise ends of the winding can filter screen is that having a respective inclined surface inclined in the width direction outside,
strainer. Further, a third roller shaft arranged so as to face the first roller shaft in the horizontal direction is provided.
The strainer according to claim 1, wherein a brush is provided on the outer peripheral surface of the third roller shaft to remove the foreign matter trapped in the rewindable filtration net wound by the first roller shaft. The strainer according to claim 2, wherein the rotation speed of the third roller shaft is faster than the rotation speed of the first roller shaft. The strainer according to claim 3, further comprising a drain, and the foreign matter removed from the rewindable filtration net by the brush on the outer peripheral surface of the third roller shaft is discharged through the drain. .. The two members having the inclined surface constituting the support member each have a folded portion folded back at an outer end portion thereof, and both ends in the width direction of the retractable filtration net are with the inclined surface. The strainer according to any one of claims 1 to 4, which is located between the folded portions. The strainer according to claim 5, wherein the rewindable filtration net supported by the support member is arranged so as to be orthogonal to the flow direction of the fluid containing the foreign matter. Wherein the first roller shaft second roller shaft is a drive roller, or the first roller shaft, a said drive roller, said second roller axis, Ru Oh in the driven roller The strainer according to claim 6. It ’s a filtration system,
A strainer for removing foreign substances contained in the fluid,
An inflow pipe that supplies a fluid containing foreign matter to the strainer,
The main fluid line pump connected to the inflow pipe and
A first valve attached to the inflow pipe on the downstream side of the main fluid line pump and on the upstream side of the strainer.
An outflow pipe for flowing a fluid from which foreign matter has been removed by the strainer,
A drain pipe for discharging foreign matter removed from the fluid by the strainer,
A waste collection device in which foreign matter flows through the drain pipe,
With a controller,
The strainer further
The inlet for introducing fluid containing foreign matter and
A rewindable filtration net that removes the foreign matter from the fluid introduced through the inlet.
An outlet for draining the fluid through the rewindable filtration net, and
A first roller shaft that winds a predetermined length of the windable filtration net, and
A second roller shaft, which feeds out the rewindable filtration net by a predetermined length, is provided.
The first roller shaft is located opposite to the second roller shaft at a predetermined distance, and the rewindable filtration net that has captured the foreign matter is attached to the first roller shaft. A wound, new windable filtration net is unwound by the second roller shaft, and further
A support member disposed between the first roller shaft and the second roller shaft to support the windable filtration net is provided.
The support member has a frame shape, and the two members corresponding to both ends in the width direction of the windable filtration net each have an inclined surface inclined outward in the width direction.
Filtration system. The strainer further
A third roller shaft arranged to face the first roller shaft in the horizontal direction is provided.
The filtration system according to claim 8, wherein a brush is provided on the outer peripheral surface of the third roller shaft to remove the foreign matter trapped in the rewindable filtration net wound by the first roller shaft. .. The filtration system according to claim 9 , wherein the rotation speed of the third roller shaft is faster than the rotation speed of the first roller shaft. The two members having the inclined surface constituting the support member each have a folded portion folded back at an outer end portion thereof, and both ends in the width direction of the retractable filtration net are with the inclined surface. The filtration system according to any one of claims 8 to 10, which is located between the folded parts. When the differential pressure between the inlet and outlet of the strainer exceeds the first threshold, the controller controls the first roller shaft to wind the windable filter net by a predetermined length. The filtration system according to claim 11 , wherein the filtration system is rotated to control the second roller shaft to pay out the rewindable filtration net by a predetermined length. The controller rotates and drives the first roller shaft or the first roller shaft based on the tension measurement value of the rewindable filter net and the rotation angle measurement values of the first roller shaft and the second roller shaft. The filtration system according to claim 12 , wherein the tension of the rewindable filtration net is controlled by the roller shaft of 2. further,
A backwash pump connected to the outflow pipe via a branch pipe on the upstream side of the second valve provided in the outflow pipe and on the downstream side of the strainer is provided.
The controller stops the main fluid line pump, closes the first valve, drives the backwash pump, and introduces a cleaning liquid or a chemical cleaning agent into the outflow pipe via the second valve. Is pressurized, the pressurized cleaning solution or the pressurized chemical cleaning agent is introduced into the strainer via the outflow pipe, and the foreign matter trapped in the retractable filtration net is the water pressure of the cleaning solution. The filtration system according to claim 13, wherein the foreign matter is removed by chemical cleaning with the chemical cleaning agent and is controlled so that the removed foreign matter is discharged to the waste collection device via a drain pipe. After the backwash step, the controller opens the first valve to drive the main fluid line pump, and the differential pressure between the inlet and outlet of the strainer is a predetermined second threshold. The filtration system according to claim 14 , wherein the backwashing step is repeatedly executed when the amount exceeds. The controller controls to open the first valve and drive the main fluid line pump after the backwash step, and the differential pressure between the inlet and outlet of the strainer is the predetermined first. If it is equal to or less than the threshold value of 2, the controller controls the second roller shaft to wind the winding filter net by a predetermined length, and controls the first roller shaft to wind the winding. The filtration system according to claim 14 , wherein a predetermined length of a removable filtration net is pumped out. The filtration system according to claim 15 or 16, wherein the predetermined second threshold value is smaller than the predetermined first threshold value.

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