WO2019092779A1

WO2019092779A1 - Strainer and straining system

Info

Publication number: WO2019092779A1
Application number: PCT/JP2017/040072
Authority: WO
Inventors: Pierre BRUCHET; Akihiro Kanno
Original assignee: Hitachi-Ge Nuclear Energy, Ltd.
Priority date: 2017-11-07
Filing date: 2017-11-07
Publication date: 2019-05-16
Also published as: JP2021501050A; JP6894049B2

Abstract

A strainer 1 which removes foreign particles from fluid introduced comprises an inlet portion which introduces fluid containing foreign particles, a wrappable straining mesh 27 which removes the foreign particles from fluid introduced through the inlet portion, an outlet portion which makes the fluid penetrated from the wrappable straining mesh 27 outflows, a first roller shaft 23 which rolls predetermined length of the wrappable straining mesh 27, and a second roller shaft 22 which rolls out predetermined length of the wrappable straining mesh 27, wherein the first roller shaft 23 faces the second roller shaft 22 positioned predetermined distance therebetween, the wrappable straining mesh 27 trap the foreign particles is rolled by the first roller shaft 23 and fresh wrappable straining mesh 22 is rolled out by the second roller shaft.

Description

STRAINER AND STRAINING SYSTEM

The present invention relates to a strainer and a straining system for removing foreign particles from fluid.

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

Patent Document 1 discloses a strainer which has a cylindrical element rotatably arranged and having a porous body formed on a wall surface and separates by trapping solid matters from liquid containing solid matters by a porous structure. In Patent Document 1, a helical screw blade is fixed in a cylindrical element by welding or the like, a brush is provided on the screw blade, and the brush is rubbed on the inner peripheral surface of the cylindrical element thereby removing the solid matters adhered to the inner peripheral surface of the cylindrical element.

Furthermore, in Patent Document 1, it is described that the assembly of the cleaning member rotating shaft, the element, the cleaning member, and the element supporting member is drawn out from the casing so that the brush material can be easily exchanged.

Patent Document 2 discloses a structure in which a filter element for filtering raw water containing sludge, a scraping mechanism disposed on the outer circumference side of the filter element and an inner circumference of the filter element by means of a scraping portion configured to brush or scraper comprising a scraping mechanism arranged on the outer peripheral side of the filter element and a scraping mechanism arranged on the inner peripheral side of the of the filter element, sludge adhered and grown on both the outer peripheral surface and the inner peripheral surface of the filter element is simultaneously scraped off and the sludge scraped is discharged through a drain tube.

Japanese Patent Application Laid-Open No. 2012-200624

Japanese Patent Application Laid-Open No. 2012-135729

However, in the configuration of Patent Document 1, although the solid matters adhering to the cylindrical element are removed by the brush, it is inevitable that the performance of separation goes down due to deterioration of the brush. Also, if the solid matters are contaminants such as a fissionable material, there is a risk that the worker will be exposed to contaminants during the brush replacement operation. Furthermore, no consideration is given to the point that the deteriorated brush is unable to be replaced the deteriorated brush in the first place when the worker is unable to approach, for example when the strainer is disposed in a narrow place.

In addition, in the configuration of Patent Document 2, it is possible to remove sludge adhering to the filter element by the scraping mechanism disposed on the outer peripheral side of the filter element and the scraping mechanism disposed on the inner peripheral side of the filter element. However, if sludge which is unable to be removed by the brush remains, or in order to maintain the filter element, it is necessary to take out the filter element from the strainer. Therefore, also in Patent Document 2, no consideration is given to the point that the deteriorated brush is unable to be replaced the deteriorated brush in the first place when the worker is unable to approach, for example when the strainer is disposed in a narrow place.

The present invention provides a strainer and a straining system capable of maintaining performance of separation for removing foreign particles from fluid containing foreign particles and being installable in environments where worker is difficult to approach such as narrow place.

In order to solve the above-mentioned problems, the strainer which removes foreign particles from fluid introduced according to the present invention comprises an inlet portion which introduces fluid containing foreign particles, a wrappable straining mesh which removes the foreign particles from fluid introduced through the inlet portion, an outlet portion which makes the fluid penetrated from the wrappable straining mesh outflows, a first roller shaft which rolls predetermined length of the wrappable straining mesh, and a second roller shaft which rolls out predetermined length of the wrappable straining mesh, wherein the first roller shaft faces the second roller shaft positioned predetermined distance therebetween, the wrappable straining mesh trap the foreign particles is rolled by the first roller shaft and fresh wrappable straining mesh is rolled out by the second roller shaft.

Also, a straining system according to the present invention comprises a strainer for removing foreign particles contained in fluid, an inflow tube for supplying fluid containing foreign particles to the strainer, a main fluid line pump connected to the inflow tube, a first valve installed at the inflow tube on the downstream side of the main fluid line pump and on the upstream side of the strainer, an outflow tube for flowing fluid from which foreign particles has been removed by the strainer, a drain tube for discharging foreign particles removed from the fluid by the strainer, a waste recovery apparatus into which foreign particles flows through the drain tube, and a controller, the strainer further comprises an inlet portion which introduces fluid containing foreign particles, a wrappable straining mesh which removes the foreign particles from fluid introduced through the inlet portion, an outlet portion which makes the fluid penetrated from the wrappable straining mesh outflows, a first roller shaft which rolls predetermined length of the wrappable straining mesh, and a second roller shaft which rolls out predetermined length of the wrappable straining mesh, wherein the first roller shaft faces the second roller shaft positioned predetermined distance therebetween, the wrappable straining mesh trap the foreign particles is rolled by the first roller shaft and fresh wrappable straining mesh is rolled out by the second roller shaft.

According to the present invention, it is possible to provide a strainer and a straining system capable of maintaining performance of separation for removing foreign particles from fluid containing foreign particles and being installable in environments where worker is difficult to approach such as narrow place.

Problems, configurations and advantageous effects other than the above will become apparent from the following description of embodiments.

An overall schematic configuration diagram of a straining system according to a first embodiment of the present invention. A front view of the strainer shown in Fig. 1. A cross-sectional view of the strainer taken along line A-A shown in Fig. 2. A view for explaining the shape of a supporting member configured to the strainer shown in Fig. 3. A functional block diagram of the controller shown in Fig. 1. A view showing the shape of a wrappable straining mesh shown in Fig. 3. A view showing another shape of the wrappable straining mesh shown in Fig. 3. A flow chart of back wash of the straining system shown in Fig. 1. An overall schematic configuration diagram of a straining system according to a second embodiment of the present invention. A vertical sectional view of the strainer shown in Fig. 9, and is a sectional view taken along the direction of fluid flow. A view for explaining the shape of a supporting member configured to the strainer shown in Fig. 10.

In the present specification, the foreign particle contained in the fluid includes organic particle, sludge, fouling particle or the like in the case where the strainer and straining system according to the present invention is applied to a water treatment system. When the strainer and the straining system according to the present invention are applied to a nuclear power plant, hazardous particle such as fissionable material is included in foreign particle contained in the fluid. The same applies to the case where the strainer and the straining system according to the present invention are applied to a thermal power plant or a pipeline for transporting oil.

Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment

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

Further, the straining system 1 includes a drain tube 11 for discharging foreign particles removed (separated) from the fluid by the strainer 2, a waste recovery apparatus 5 into which foreign particles flows via the drain tube 11, and a drain valve 8 as a third valve installed in the drain pipe 11 on the upstream side of the waste recovery apparatus 5 and on the downstream side of the strainer 2.

In addition, the straining system 1 includes a controller 12 which will be described later in detail for controlling a strainer 2, a main fluid pump 3, a back wash pump 4, an upstream valve 6 as a first valve, a downstream valve 7 as a second valve, and a drain valve 8.

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 drain valve 8 as the third valve.

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

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

The back wash pump 4 pressurizes a cleaning liquid or a chemical cleaning agent introduced into the outflow tube 10 via the downstream valve 7 as a second valve, and cleaning liquid pressurized, chemical cleaning agent pressurized or the like is introduced into the strainer 2 via the outflow tube 10. The details of the back wash will be described later.

Fig. 2 is a front view of the strainer 2 shown in Fig. 1. As shown in Fig. 2, the strainer 2 includes a main housing 21, a first roller shaft 23, a second roller shaft 22, a first roller shaft support 25 for rotatably supporting the first roller shaft 23, a second roller shaft support 24 for rotatably supporting the second roller shaft 22, a counter-rotating brush 26, a wrappable straining mesh 27, an outlet flange 28, a supporting member 29 for supporting the wrappable straining mesh 27, a drain 30, a speed-increasing gear for counter-rotating brush 32, and a roller shaft drive unit 31. Since the front view shown in FIG. 2 is a front view as viewed along the direction of the flow of the fluid containing the foreign particles, the outlet flange 28 is shown by a dotted line because it exists on the far side in FIG. 2.

The first roller shaft 23 disposed on the lower side in the vertical direction inside the main housing 21 has inclined surfaces 23a at both axial end portions (both end portions in the longitudinal direction). Namely, the inclined surface 23a has a shape approximating a shape in which a cone is cut out. In other words, the inclined surface 23a has such a shape that the outer diameter of the first roller shaft 23 is continuously enlarged as it goes toward the axial end portions (both end portions in the longitudinal direction).

The second roller shaft 22 disposed on the upper side in the vertical direction inside the main housing 21 has inclined surfaces 22a at both axial end portions (both end portions in the longitudinal direction). Namely, the inclined surface 22a has a shape approximating a shape in which a cone is cut out. In other words, the inclined surface 22a has such a shape that the outer diameter of the second roller shaft 23 is continuously enlarged as it goes toward the axial end portions (both end portions in the longitudinal direction).

The outer diameter of the first roller shaft 23 excluding the both axial end portions (the both end portions in the longitudinal direction) having the inclined surface 23a and the outer diameter of the second roller shaft 22 excluding the both axial end portions (the both end portions in the longitudinal direction) having the inclined surface 22a are preferably the same.

The roller shaft drive unit 31 includes a stepper motor or a servo motor (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 wrappable straining mesh 27 to be described in detail later is rolled by the first roller shaft 23 by a predetermined length (predetermined quantity of roll) and is rolled out by the second roller shaft 22 by a predetermined length (predetermined quantity of roll out). In the example shown in Fig. 2, the wrappable straining mesh 27 is supported and guided by the supporting member 29 and moves in the vertical downward direction by a predetermined length.

In addition, the stepper motor or the servo motor (not shown) also rotationally drives the roller shaft (third roller shaft) of the counter-rotating brush 26. In other words, the counter-rotating 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 stepper motor or a servomotor (not shown). The outer diameter of the counter-rotating 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 taken along line A-A shown in Fig. 2. As shown in Fig. 3, the first roller shaft 23 and the second roller shaft 22 are spaced apart from each other by a predetermined distance in the vertical direction so as to face each other. Further, the first roller shaft 23 is disposed to face the counter-rotating brush 26 in the horizontal direction. When the wrappable straining mesh 27 is rolled by the first roller shaft 23 by predetermined length L (predetermined quantity of roll), the foreign particles trapped by the wrappable straining mesh 27 is scraped off by the counter-rotating brush 26. The foreign particles scraped flows through the drain tube 11 via the drain 30 by gravity and flows into the waste recovery apparatus 5 (FIG. 1).

Here, the rotation speed of the roller shaft (the third roller shaft) of the counter-rotating brush 26 is faster than the rotation speed of the first roller shaft 23. This makes it possible to efficiently remove the foreign particles trapped by the wrappable straining mesh 27 rolled by the first roller shaft 23 regarded as being in a stopped state relatively.

The speed-increasing gear for counter-rotating brush 32 (Fig. 2) has a plurality of gears, and the rotation speed of the roller shaft (third roller shaft) of the counter-rotating 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 engaging with the selected gear to half (1/2), the rotation speed of the roller shaft (third roller shaft) of the counter-rotating brush 26 doubles. The appropriate rotation speed of the roller shaft (third roller shaft) of the counter-rotating brush 26 can be appropriately set by confirming the brushing efficiency in advance by testing or the like.

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 the outlet flange 28 on the side where the fluid flows out. The inlet flange 33 is watertightly fastened to the inflow tube 9 by bolts, for example. Further, the outlet flange 28 is watertightly fastened to the outflow tube 10 by bolts, for example. In other words, the inlet portion (also called inlet nozzle) of the strainer 2 is connected to the inflow tube 9 via a joint, and the outlet portion (also called outlet nozzle) of the strainer 2 is connected to the outflow tube 10 via a joint.

The wrappable straining mesh 27 wound around the first roller shaft 23 and the second roller shaft 22 which are spaced apart by a predetermined distance in the vertical direction and opposed to each other and supported by the supporting member 29, is disposed to be orthogonal to the direction of fluid flow. It is to be noted that the wrappable straining mesh 27 is not limited to be disposed so as to be orthogonal to the direction of fluid flow. For example, the inlet portion (inlet nozzle) of the strainer 2 may be bent by routing of the inflow tube 9 connected to the inlet portion (inlet nozzle) of the strainer 2 via a joint. In this case, the wrappable straining mesh 27 is disposed to have the predetermined angle with respect to the direction of the fluid flow. Depending on the fluid, it may be possible to more efficiently trap foreign particles contained in the fluid by inclining the wrappable straining mesh 27 so as to have the predetermined angle with respect to the direction of the fluid flow.

Both of the first roller shaft 23 and the second roller shaft 22 which are spaced apart from each other by the predetermined distance in the vertical direction and opposed to each other are driving rollers. Namely, the first roller shaft 23 and the second roller shaft 22 are synchronously rotated and driven by the stepper motor or the servo motor (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 driving rollers, the tension of the wrappable straining mesh 27 wound around the first roller shaft 23 and the second roller shaft 22 can be controlled with high accuracy. The wrappable straining mesh 27 in which the foreign particles contained in the fluid is trapped is rolled by the predetermined quantity of roll (predetermined length L) by the first roller shaft 23. Similarly, a fresh wrappable straining mesh 27 (foreign particles contained in the fluid are not trapped) is rolled out in the predetermined quantity of roll out (predetermined length L) by the second roller shaft 22. Instead of using the first roller shaft 23 and the second roller shaft 22 as driving rollers, the following structure may be adopted.

Namely, 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 both end portions in the axial direction (both end portions 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 may be adopted. By biasing the spring in the reverse direction, the tension of the wrappable straining mesh 27 is controlled. Further, the both end portions in the axial direction (both end portions in the longitudinal direction) of the first roller shaft 23 as the driving roller and the both end portions in the axial direction (both end portions in the longitudinal direction) of the second roller shaft 22 as the driven roller are formed 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.

The wrappable straining mesh 27 is made of, for example, stainless steel. Not limited to stainless steel, the constituent material of the wrappable straining mesh 27 may be appropriately selected in accordance with the physical properties of foreign particles to be trapped or fluid. For example, in the case of a corrosive fluid, a suitable metallic material, a metallic material coated with a nonmetallic material or a nonmetallic material, or the like is selected according to the chemical properties of the corrosive fluid. In addition, when foreign particles contain a high concentration fissionable material, it is desirable to use a metal material such as stainless steel.

Fig. 4 is a view for explaining the shape of a supporting member configured to the strainer shown in Fig. 3. In Fig. 4, the upper left drawing shows the perspective view of the supporting member 29, the upper right drawing shows the front view of the supporting member 29, the lower left drawing shows the side view of the supporting member 29, the lower right drawing shows the top view of the supporting member 29. It should be noted that the front view of the supporting member 29 is a front view when viewed along the direction of fluid flow. As shown in the perspective view of Fig. 4, the supporting member 29 has a frame shape. The supporting member 29 includes two members standing vertically on the side where the fluid flows in, two members in the horizontal direction connecting both vertical end portions of these two members, a pair of members vertically standing (leg portions) extending from both end portions of the two members parallel to the direction of flow of the fluid.

Further, as shown in the front view of Fig. 4, the supporting member 29 is constituted by two members standing upright in the vertical direction and two members in the horizontal direction connecting the both end portions in the vertical direction of the two members, defining a rectangular opening. By forming the supporting member 29 in the frame shape as described above, when the fluid containing the foreign particles pressurized by the main fluid line pump 3 and the fluid containing the foreign particles pressurized passes through the wrappable straining mesh 27 supported by the supporting member 29 , it is possible to reduce the pressure loss in this case. As shown in the external perspective view and the top view of FIG. 4, the two members standing in the vertical direction constituting the support member 29 has respectively an inclined surface 29a which projects toward the outer end portion in the width direction so as to face the direction of the fluid flow. In other words, the inclined surface 29a has a shape such that the distance between the two members rising in the vertical direction increases as it goes outward, or the inclined surface 29a has a shape that is inclined outward in the width direction of a member standing in the vertical direction. As a result, both end portions of the wrappable straining mesh 27 in the width direction (the direction orthogonal to the rolling direction) are abutted against the inclined surface 29a of the supporting member 29 so that foreign particles trapped by the wrappable straining mesh 27 can be prevented from leaking from both end portions in the width direction (direction orthogonal to the rolling direction) of the wrappable straining mesh 27 to the downstream side.

The inclination angle of the inclined surface 29a is substantially the same as the inclination angle of the inclined surface 23a formed at both axial end portions (longitudinal both end portions) of the first roller shaft 23 and the inclination angle of the inclined surface 22a formed at both axial end portions (longitudinal both end portions) of the second roller shaft 22. As a result, at the time of rolling the wrappable straining mesh 27 by the first roller shaft 23 (at the time of rolling out the wrappable straining mesh 27 by the second roller shaft 22), it is possible to prevent deflection from occurring in the wrappable straining mesh 27.

The supporting member 29 is made of, for example, stainless steel. It should be noted that the material of the supporting member 29 is not limited to stainless steel, and may be suitably selected according to the physical properties of the fluid. For example, in the case of a corrosive fluid, a suitable metallic material, a metallic material coated with a nonmetallic material or a nonmetallic material, or the like is selected according to the chemical properties of the corrosive fluid. In addition, when foreign particles contain a high concentration fissionable material, it is desirable to use a metal material such as stainless steel. Considering the reduction in pressure loss and the withstand pressure at the time of passage of the fluid containing foreign particles pressurized, it is preferable to make the constituent material of the supporting member 29 be high strength stainless steel.

Fig. 5 is a functional block diagram of the controller 12 shown in Fig. 1. First, although not shown in Figs. 2 and 3, in the strainer 2 various sensors 34 are installed such as a tension sensor for measuring the tension of the wrappable straining mesh 27, a pressure sensor (fluid pressure sensor) for measuring the differential pressure between the inlet portion (inlet nozzle) side and the outlet portion (outlet nozzle) side of the strainer 2, and 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. In the case where the motor installed in the roller shaft drive unit 31 is a servo motor, a position detector such as a potentiometer and a speed detector such as a tacho generator are installed in the strainer 2 as the various sensors 34.

As shown in Fig. 5, the controller 12 includes a tension control unit 41, a quantity of roll control unit 42, a timing of roll control unit 43, a back wash control unit 44, a storage unit 45, an input IF 46, an output IF 47, and a communication IF 48, these are accessible to each other via an internal bus 49. The tension control unit 41, the quantity of roll control unit 42, the timing of roll control unit 43, and the back wash control unit 44 are realized by a processor such as a CPU (Central Processing Unit) (not shown), a ROM storing various programs, a RAM temporarily storing operation process data, an external storage device. In addition, the processor such as the CPU reads out and executes various programs stored in the ROM, and stores the calculation result as the execution result in the RAM or the external storage device. Although the tension control unit 41, the quantity of roll control unit 42, the timing of roll control unit 43, and the back wash control unit 44 are shown as being divided into a single functional block. It may be a computing unit or may be configured to integrate desired functional blocks.

The input IF 46 inputs the tension measurement value of the wrappable straining mesh 27 from the tension sensor as the sensor 34, transfers the measurement value to the tension control unit 41 via the internal bus 49, and stores the measurement value in the predetermined storage area of the storage unit 45. Further, the input IF 46 inputs the rotation angle measurement values of the first roller shaft 23 and the second roller shaft 22 from the rotation angle sensor, transfers the measurement values to the tension control unit 41 via the internal bus 49, and stores the measurement value in the predetermined storage area of the storage unit 45. The input I F 46 receives the measurement value of the differential pressure between the inlet portion (inlet nozzle) side and the outlet portion (outlet nozzle) side of the strainer 2 from the pressure sensor (fluid pressure sensor), and transfers the measurement value of the differential pressure to the timing of roll control unit 43 via the internal bus 49, and stores the measurement value of the differential pressure in the predetermined storage area of the storage unit 45. When the motor installed in the roller shaft drive unit 31 is the servo motor, the input IF 46 inputs the measurement value from the position detector such as the potentiometer and transfers the measurement value to the quantity of roll control unit 42 via the internal bus 49, and stores the measurement value in the predetermined storage area of the storage unit 45. The measurement value of the differential pressure between the inlet portion (inlet nozzle) side and the outlet portion (outlet nozzle) side of the strainer 2 from the pressure sensor (fluid pressure sensor) is also transferred to the back wash control unit 44 via the internal bus 49. 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 the predetermined cycle.

Based on the tension measurement value of the wrappable straining mesh 27 transferred from the input IF 46 and the measurement value of the rotational angle of the first roller shaft 23 and the second roller shaft 22, the tension control unit 41 outputs a control command to the roller shaft drive unit 31 via the output IF 47 so that the tension of the wrappable straining mesh 27 falls within an allowable value range of an appropriate tension. The control command to be output here is a voltage signal of PWM (Pulse-Width Modulation) when the motor installed in the roller shaft drive unit 31 is the servo motor, and drives the first roller shaft 23 or the second roller shaft 22 to rotate at the rotation angle corresponding to the voltage signal of PWM. When the motor installed in the roller shaft drive unit 31 is the stepper motor, a driving pulse is output as the control command, and the first roller shaft 23 or the second roller shaft 22 is rotationally driven according to the driving pulse. The allowable range of the appropriate tension of the wrappable straining mesh 27 may be measured, for example, by measuring the tension of the wrappable straining mesh 27 that can be accepted by testing beforehand and storing it in the storage unit 45.

The timing of roll control unit 43 judges whether or not the measurement value of the differential pressure between the inlet portion (inlet nozzle) side and the outlet portion (outlet nozzle) side of the strainer 2 transferred from the input IF 46 exceeds the predetermined first threshold value, it is judged that the separation performance for removing the foreign particles of the wrappable straining mesh 27 that can be rolled due to the fact that the foreign particles trapped by the wrappable straining mesh 27 has reached the predetermined amount is reduced in the case of exceeding the predetermined first threshold value, and outputs a rolling start command to the quantity of roll control unit 42 via the internal bus 49. In the present embodiment, the timing of roll control unit 43 outputs the rolling start command based on the measurement value of the differential pressure between the inlet portion (inlet nozzle) side and the outlet portion (outlet nozzle) side of the strainer 2, but the present invention is not limited thereto. 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 the sensor 34, and based on the measurement value of the flow velocity by the flow velocity sensor, the quantity of roll control unit 42 may be configured to output the rolling start command.

In accordance with the rolling start command from the timing of roll control unit 43, the quantity of roll control unit 42 sets the quantity of roll to the predetermined quantity of roll (predetermined length L) and the predetermined quantity of roll out (predetermined length L), and the quantity of roll control unit 42 outputs a corresponding control command to the roller shaft drive unit 31 via the output IF 47. Here, when the motor installed in the roller shaft drive unit 31 is the servo motor, the quantity of roll control unit 42 outputs the voltage signal of PWM corresponding to the predetermined quantity of roll (predetermined length L) to the servo motor as the control command, the quantity of roll control unit 42 drives the first roller shaft 23 to rotate by the number of rotations corresponding to the voltage signal of PWM. The quantity of roll control unit 42 outputs the voltage signal of PWM corresponding to the predetermined quantity of roll out (predetermined length L) to the servo motor as the control command, the quantity of roll control unit 42 drives the second roller shaft 22 to rotate by the number of rotations corresponding to the voltage signal of PWM. In the case where the motor installed in the roller shaft drive unit 31 is the stepper motor, the quantity of roll control unit 42 outputs the driving pulse corresponding to the predetermined quantity of roll (predetermined length L) to the stepper motor as the control command, the quantity of roll control unit 42 drives the first roller shaft 23 to rotate by the number of rotations corresponding to the driving pulse. The quantity of roll control unit 42 outputs the driving pulse corresponding to the predetermined quantity of roll out (predetermined length L) to the stepper motor as the control command, The quantity of roll control unit 42 drives the second roller shaft 22 to rotate by the number of rotations corresponding to the driving pulse. However, at the time of rolling the wrappable straining mesh 27, if a difference occurs in the number of rotations of the first roller shaft 23 and the second roller shaft 22, there is a possibility that the tension of the wrappable straining mesh 27 may fluctuate. Therefore, based on the tension measurement value of the wrappable straining mesh 27 transferred from the input IF 46 and the rotation angle measurement values of the first roller shaft 23 and the second roller shaft 22, feedback control is executed by outputting the control command to the roller shaft drive unit 31 via the output IF 47 so that the tension of the wrappable straining mesh 27 falls within the allowable range of the appropriate tension.

In the case where the first roller shaft 23 is a driving roller and the second roller shaft 22 is a driven roller, the quantity of roll control unit 42 outputs the voltage signal of PWM corresponding to the predetermined quantity of roll out (predetermined length L) to the servo motor that rotationally drives the first roller shaft 23 as the control command. Alternatively, the quantity of roll control unit 42 outputs the driving pulse corresponding to the predetermined quantity of roll out (predetermined length L) to the stepper motor that rotationally drives the first roller shaft 23 as the control command.

Further, the quantity of roll control unit 42, in response to the rolling start command from the timing of roll control unit 43, outputs the control command to the roller shaft drive unit 31 through the output IF 47 so that the rotor shaft (third rotor shaft) of the above-described counter-rotating brush 26 is rotated by the servo motor or the stepper motor.

It is desirable that the rolling operation of the above-mentioned wrappable straining mesh 27 is carried out while the inflow of fluid containing foreign particles to the strainer 2 is stopped. Therefore, the quantity of roll control unit 42 outputs the stop command to the main fluid line pump 3 via the output IF 47 and outputs the control command for closing the upstream valve 6 as the first valve.

The back wash control unit 44 rolls all the wrappable straining mesh 27 that can be rolled by the first roller shaft 23, and the measurement value of the differential pressure between the inlet portion (inlet nozzle) side and the outlet portion (outlet nozzle) side of the strainer 2 transferred from the input IF 46 exceeds the predetermined first threshold, The back wash control unit 44 operates. The back wash control unit 44 outputs the stop command to the main fluid line pump 3 via the output IF 47 and outputs the control command for closing the upstream valve 6 as the first valve. Then, the back wash control unit 44 outputs the drive command to the back wash pump 4 via the output IF 47, so that the back wash pump 4 pressurizes the cleaning liquid or the chemical cleaning agent introduced into the outflow tube 10 through the downstream valve 7 as the second valve and the cleaning liquid pressurized or the chemical cleaning agent pressurized is introduced into the strainer 2 via the outflow tube 10. The cleaning liquid pressurized or chemical cleaning agent pressurized introduced into the strainer 2 is used to remove the foreign particles trapped in the wrappable straining mesh 27 by the water pressure of cleaning liquid or chemical cleaning of chemical cleaning agent, and the foreign particles removed are discharged to the waste recovery apparatus 5 via the drain 30 and the drain tube 11 by gravity. This eliminates the need for the worker to replace the wrappable straining mesh 27 since the wrappable straining mesh 27 is refreshed. The back wash control unit 44 executes the above operation by the predetermined quantity of roll (predetermined length L). The back wash control unit 44 stores history data such as the number of times of back washing in the predetermined storage area of the storage unit 45 via the internal bus 49 and the back wash control unit 44 transmits history data such as the number of back washing operations to the central control room 51 or the control panel 52 via the communication IF 48. This allows the operator (worker) to check the history data such as the number of back washing operations displayed and to easily determine that the back wash frequency has reached the set number of times. Basically, even though it is not necessary to replace the wrappable straining mesh 27, by repeatedly using the wrappable straining mesh 27 back washed for a long period of time, it is possible to judge the necessity of replacing the wrappable straining mesh 27, for example, when a failure occurs in the wrappable straining mesh 27. Details of the operating flow during back washing will be described later.

Fig. 6 is a view showing the shape of the wrappable straining mesh 27 shown in Fig. 3. In Fig. 6, the direction of movement of the wrappable straining mesh 27 which can be obtained by the white arrow, that is, the rolling direction by the first roller shaft 23 is shown. The wrappable straining mesh 27 shown in Fig. 6 has magnetic bodies 61 at positions corresponding to the predetermined length L along the longitudinal direction at both end portions in the width direction thereof. Namely, the magnetic bodies 61 are disposed at a distance of the predetermined length L between two stainless steel plates in which the mesh part is fixed. In this case, the mesh size of the mesh part is appropriately set within a range of 20 mm to 100 mm, for example. Since the mesh size of the mesh part depends on the average outer diameter of the foreign particle to be trapped and the pressure loss, it may be set as appropriate based on the average outer diameter of the foreign particle and the pressure loss.

As described above, in the case where the wrappable straining mesh 27 by the first roller shaft 23 or the first roller shaft 23 and the second roller shaft 22 is rolled with the predetermined length L, the rolling of the predetermined length L is detected by detecting the position of the magnetic body 61 and the rotation operation of the servo motor or the stepper motor installed in the roller shaft drive unit 31 is stopped.

Thus, by disposing the magnetic bodies 61 at intervals corresponding to the predetermined length L at both ends in the width direction of the wrappable straining mesh 27, compared to the control of the servo motor by the voltage signal of PWM corresponding to the above-mentioned predetermined length L or the control of the stepper motor by the driving pulse corresponding to the predetermined length L, the position of the wrappable straining mesh 27 is set to a higher precision to be controlled.

Fig. 7 is a view showing another shape of the wrappable straining mesh 27 shown in Fig. 3. Fig. 7 shows the direction of movement of the wrappable straining mesh 27, which can be obtained by the white arrow, that is, the rolling direction by the first roller shaft 23. As shown in Fig. 7, the wrappable straining mesh 27 has a notch 62 at a position corresponding to the predetermined length L along the longitudinal direction at both end portions in the width direction of the wrappable straining mesh 27. Namely, a notch 62 is formed on a thin plate-like stainless steel plate that fixes the mesh portion at the predetermined length L interval. In this case, the mesh size of the mesh part is appropriately set within a range of 20 mm to 100 mm, for example. Since the mesh size of the mesh part depends on the average outer diameter of the foreign particle to be trapped and the pressure loss, it may be set as appropriate based on the average outer diameter of the foreign particle and the pressure loss.

As described above, in the case where the first roller shaft 23, or the first roller shaft 23 and the second roller shaft 22 roll the wrappable straining mesh 27 with the predetermined length L, the position of the notch 62 is detected by fitting the notch 62 to the convex portion (not shown) provided in the main housing 21 to detect the rolling of the predetermined length L, and the rotation of the servo motor or the stepper motor installed in the roller shaft drive unit 31 is stopped.

Thus, by forming notches 62 at intervals corresponding to the predetermined length L at both ends in the width direction of the wrappable straining mesh 27, compared to the control of the servo motor by the voltage signal of PWM corresponding to the above-mentioned predetermined length L or the control of the stepper motor by the driving pulse corresponding to the predetermined length L, the position of the wrappable straining mesh 27 is set to a higher precision to be controlled.

Next, the description will be given of the operation flow during back washing of the straining system 1 according to the present embodiment. Fig. 8 is a flow chart of back wash of the straining system shown in Fig. 1. As described above, the back washing is carried out in such a manner that all of the wrappable straining mesh 27 which can be rolled by the first roller shaft 23 are rolled and the measurement value of the differential pressure between the inlet portion (inlet nozzle) side and the outlet portion (outlet nozzle) side of the strainer 2 exceeds the first threshold value.

In step S11, the back wash control unit 44 constituting the controller 12 outputs the stop command to the main fluid line pump 3 via the output IF 47 and outputs the control command that closes the upstream valve 6 as the first valve. At this time, the downstream valve 7 as the second valve and the drain valve 8 as the third valve are kept open.

In step S12, the back wash control unit 44 drives the back wash pump 4 by outputting the driving command to the back wash pump 4 via the output IF 47. The back wash pump 4 pressurizes the cleaning liquid or the chemical cleaning agent introduced into the outflow tube 10 through the downstream valve 7 as the second valve and the cleaning liquid pressurized or the chemical cleaning agent pressurized is introduced into the strainer 2 via the outflow tube 10. The cleaning liquid pressurized or the chemical cleaning agent pressurized introduced into the strainer 2 is removed by the water pressure of the cleaning liquid or the chemical cleaning with the chemical cleaning agent to remove the foreign particles trapped in the wrappable straining mesh 27 and the removed foreign particles are discharged to the wasted recovery apparatus 5 via the drain 30 and the drain tube 11 by gravity.

In step S13, the back wash control unit 44 determines whether or not the predetermined time has elapsed. If it is determined that the predetermined time has elapsed, the process proceeds to step S 14. On the other hand, if it is determined that the predetermined time has not elapsed, the process returns to step S12 and the back washing is continued.

In step S14, the back wash control unit 44 outputs the stop command to the back wash pump 4 via the output IF 47 and outputs the control command for opening the upstream valve 6 as the first valve. At this time, the downstream valve 7 as the second valve and the drain valve 8 as the third valve are kept open.

In step S15, the main fluid line pump 3 is driven by the back wash control unit 44 outputting the driving command to the main fluid line pump 3 via the output IF 47. The main fluid line pump 3 pressurizes the fluid containing the foreign particles and introduces the fluid containing the foreign particles pressurized into the strainer 2 through the inflow tube 9 and the upstream valve 6 as the first valve.

In step S16, the back wash control unit 44 determines whether the measurement value of the differential pressure between the inlet portion (inlet nozzle) side and the outlet portion (outlet nozzle) side of the strainer 2 transferred from the input IF 46 exceeds the predetermined threshold value (predetermined second threshold value) or not. If the result of the determination shows that the measurement value of the differential pressure exceeds the second threshold value, the flow returns to step S12 and the operation from step S12 to step S16 is repeatedly executed. On the other hand, when the measurement value of the differential pressure is equal to or less than the predetermined second threshold value as a result of the determination, the back wash control unit 44 determines that back washing of the wrappable straining mesh 27 to the predetermined length L is completed and the back washing operation is terminated. The predetermined second threshold value is set to a value smaller than the predetermined first threshold value.

The operations from step S11 to step S16 described above are performed for all areas of the wrappable straining mesh 27. Namely, when the back wash control unit 44 detects that back washing of the wrappable straining mesh 27 with respect to the predetermined length L is completed in the above-described step S16, the back wash control unit 44 outputs the detection signal to the quantity of roll control unit 42 constituting the controller 12 via the internal bus 49. The quantity of roll control unit 42 responds to the predetermined quantity of roll (predetermined length L) and the predetermined quantity of roll out (predetermined length L) in response to the detection signal input from the back wash control unit 44 and outputs the control command to the roller shaft drive unit 31 via the output IF 47.

If the motor installed in the roller shaft drive unit 31 is the servo motor, the quantity of roll control unit 42 outputs the voltage signal of PWM corresponding to the predetermined quantity of roll (predetermined length L) to the servo motor as the control command and rotates the second rotor shaft 22 by the number of rotations corresponding to the voltage signal of PWM. The quantity of roll control unit 42 outputs the voltage signal of PWM corresponding to the predetermined quantity of roll out (predetermined length L) as the control command to the servo motor, and drive the first rotor shaft 23 by the number of rotations corresponding to the voltage signal of PWM. When the motor installed in the roller shaft drive unit 31 is the stepper motor, the quantity of roll control unit 42 sets the driving pulse corresponding to the predetermined quantity of roll (predetermined length L) as the control command, and the second rotor shaft 22 is rotated by the number of rotations corresponding to the driving pulse. The quantity of roll control unit 42 outputs the driving pulse corresponding to the predetermined quantity of roll out (predetermined length L) as the control command to the stepper motor, and the first rotor shaft 23 is rotated by the number of rotations corresponding to the driving pulse. If there is a difference in the number of rotations of the first roller shaft 23 and the second roller shaft 22 during rolling of the wrappable straining mesh 27, there is a possibility that the tension of the wrappable straining mesh 27 may change. Therefore, the tension control unit 41 calculates the tension measurement value of the wrappable straining mesh 27 transferred from the input IF 46, and the rotation angle measurement values of the first roller shafts 23 and the second roller shafts 22, the feedback control is performed by outputting the control command to the roller shaft drive unit 31 via the output IF 47 so that the tension of the wrappable straining mesh 27 is within the allowable tension value range. After that, the operations from step S11 to step S16 are performed in the same manner.

Thus, once back washing has been completed for all areas of wrappable straining mesh 27, the wrappable straining mesh 27 refreshed is completely rolled on the second roller shaft 22 to remove the foreign particles from the fluid containing the foreign particles again by the strainer 2 without replacing the wrappable straining mesh 27.

As described above, according to the present embodiment, it is possible to provide a strainer and a straining system capable of maintaining performance of separation for removing foreign particles from fluid containing foreign particles and being installable in environments where worker is difficult to approach such as narrow place.

According to the present embodiment, it is possible to automatically supply the fresh f wrappable straining mesh 27 with the first roller shaft 23 and the second roller shaft 22.

Further, according to the present embodiment, even when the fresh wrappable straining mesh 27 are rolled by the first roller shaft 23 at the end, it is possible to refresh the wrappable straining mesh 27 by reversing and rotating the first roller shaft 23 and the second roller shaft 22 in a reverse direction so that the life of the strainer 2 can be prolonged.

Second Embodiment

Fig. 9 is an overall schematic configuration diagram of a straining system 1a according to a second embodiment of the present invention. In the first embodiment, the fluid containing the foreign particles flows into the strainer in the horizontal direction. In contrast, in this embodiment, the fluid containing the foreign particles flows into the strainer in the vertical direction, and the shape of the supporting member are different from first embodiment. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and a description overlapping with the first embodiment will be omitted.

As shown in Fig. 9, in the straining system 1a according to the present embodiment, the fluid containing the foreign particles pressurized by the main fluid line pump 3 flows into the strainer 2a through the inflow tube 9 and the upstream valve 6 as the inflow as the first valve 6 in the vertical direction. The fluid containing the foreign particles introduced into the strainer 2a is removed from the foreign particles and flows out in the vertical direction via the outflow tube 10 and the downstream valve 7 as the second valve.

The foreign particles removed by the strainer 2a is discharged in the vertical direction to the waste recovery apparatus 5 via the drain tube 11 and the drain valve 8 as the third valve.

Fig. 10 is a vertical sectional view of the strainer 2a shown in Fig. 9, and is a sectional view taken along the direction of fluid flow. As shown in Fig. 10, the first roller shaft 63 (right side) and the second roller shaft 64 (left side) are disposed so as to face each other at the predetermined distance in the horizontal direction. The foreign particles trapped in the wrappable straining mesh 27 is scraped off by the counter-rotating brush 26 when the wrappable straining mesh 27 is rolled by the first roller shaft 63 with the predetermined length L (predetermined quantity of roll). The foreign particles scraped flows into the waste recovery apparatus 5 (Fig. 9) through the drain tube 11 via the drain 30 by gravity.

Here, the rotation speed of the rotor shaft (third rotor shaft) of the counter-rotating brush 26 is higher than the rotation speed of the first rotor shaft 63. This makes it possible to efficiently remove the foreign particles trapped in the wrappable straining mesh 27 rolled by the first roller shutter 63, which is regarded as being in a stopped state, either relative to each other.

The wrappable straining mesh 27 wound on the first roller shafts 63 and second roller shafts 64 which are spaced apart from each other by the predetermined distance in the horizontal direction and are opposed to each other and supported by the supporting member 29 is disposed to be orthogonal to the flow direction of the fluid. The wrappable straining mesh 27 is not limited to a configuration that is 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 tube 9 connected to the inlet portion (inlet nozzle) of the strainer 2a via the joint. In this case, the wrappable straining mesh 27 is disposed to have the predetermined angle with respect to the flow direction of the fluid. In addition, depending on the fluid, it may be possible to trap the foreign particles contained in the fluid more efficiently by disposing the wrappable straining mesh 27 so as to have the predetermined angle with respect to the flow direction of the fluid.

The first roller shaft 63 and the second roller shaft 64, which are spaced apart from each other by the predetermined distance in the horizontal direction and opposed to each other, are both driving rollers. Namely, the first rotor shaft 63 and the second rotor shaft 64 are synchronously driven by the stepper motor or the servo motor (not shown) provided on 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 making the first roller shaft 63 and the second roller shaft 64 both as driving rollers, the wrappable straining mesh 27 wound on the first roller shaft 63 and the second roller shaft 64 can be controlled with high precision. The wrappable straining mesh 27 with foreign particles trapped in the fluid is rolled in the predetermined quantity of roll (predetermined length L) by the first roller shaft 63. Likewise, a fresh wrappable straining mesh 27 (foreign particles contained in the fluid are not trapped) is rolled out by the second roller shaft 64 at the predetermined quantity of roll out (predetermined length L). Instead of using the first roller shaft 63 and the second roller shaft 64 as driving rollers, the following structure may be adopted.

Namely, 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 both end portions in the axial direction (both end portions 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 may be adopted. By biasing the spring in the reverse direction, the tension of the wrappable straining mesh 27 is controlled. Further, the both end portions in the axial direction (both end portions in the longitudinal direction) of the first roller shaft 63 as the driving roller and the both end portions in the axial direction (both end portions in the longitudinal direction) of the second roller shaft 64 as the driven roller are formed 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.

Fig. 11 is a view for explaining the shape of a supporting member configured to the strainer 2a shown in Fig. 10. In Fig. 11, the upper left drawing shows the perspective view of the supporting member 29, the upper right drawing shows the front view of the supporting member 29, the lower left drawing shows the side view of the supporting member 29 and the side view seen from the front side in the perspective view, the lower right drawing shows the side view of the supporting member 29 in the perspective view as viewed from the right side. The front view of the support member 29 is a front view when viewed along the fluid flow direction. As shown in the perspective view of Fig. 11, the supporting member 29 has a frame shape. The supporting member 29 is composed of two members horizontally separated and extending to the side on which the fluid flows and two members in the horizontal direction connecting the two ends of the two members in the horizontal direction, (Leg portions) extending parallel to the direction of fluid flow (vertical direction) from both ends of the two members that extend away from each other in the direction of the fluid. As shown in the front view of Fig. 11, the supporting member 29 is composed of two members extending in the horizontal direction and extending in the horizontal direction, and two members extending in the horizontal direction four rectangular openings are defined by two cross-shaped members in addition to the two horizontally oriented members that connect the two ends. As described above, the supporting member 29 has two cross-shaped members, so that the fluid containing the foreign particles pressurized is supported by the supporting member 29 as compared with the supporting member 29 of the first embodiment. It is possible to improve the effect of preventing the flexure of the wrappable straining mesh 27 although the pressure loss when the fluid containing the foreign particles pressurized passes through the wrappable straining mesh 27 supported by the supporting member 29 is increased to some extent and the strength of the supporting member 29 can be improved.

As shown in the perspective view and the lower right side view of Fig. 11, the two members spaced apart from each other in the horizontal direction and provided on the side where the fluid constituting the supporting member 29 flows are disposed in the width direction has an inclined surface 29a which protrudes so as to face the flow direction of the fluid as it goes toward the outer end portion. In other words, the inclined surface 29a is formed in such a shape that the gap between the two members, which are spaced apart from each other in the horizontal direction provided on the side on which the fluid flows, as viewed from above, and a shape that is inclined outward in the width direction of the member which is extended and separated from each other in the direction of the axis. Thus, both end portions of the wrappable straining mesh 27 in the width direction (direction orthogonal to the rolling direction) abut against the inclined surfaces 29a of the supporting member 29, so that the foreign particles trapped in the wrappable straining mesh 27 can be prevented from leaking from the both ends of the wrappable straining mesh 27 in the width direction (direction orthogonal to the rolling direction) to the downstream side.

The inclination angle of the inclined surface 29a is substantially the same as the inclination angle of the inclined surface 23a formed at both axial end portions (longitudinal both end portions) of the first roller shaft 63 and the inclination angle of the inclined surface 22a formed at both axial end portions (longitudinal both end portions) of the second roller shaft 64. As a result, at the time of rolling the wrappable straining mesh 27 by the first roller shaft 63 (at the time of rolling out the wrappable straining mesh 27 by the second roller shaft 64), it is possible to prevent deflection from occurring in the wrappable straining mesh 27.

The configuration and operation of the controller 12 and the operational flow during back washing in the straining system 1a are the same as those in the first embodiment, and 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 deflection of the wrappable straining mesh 27 is improved, and the strength of the supporting member 29 can be improved.

The moving direction (rolling direction) of the wrappable straining mesh 27 capable of rolling the member having the inclined surface 29a of the member constituting the supporting member 29 having the frame shape shown in the above-mentioned first embodiment and second embodiment, The length may be variable in a direction parallel to the moving direction (rolling direction). In this case, it is possible to adjust the tension of the wrappable straining mesh 27 by adjusting the length of the member having the inclined surface 29a with, for example, an actuator.

The member having the inclined surface 29a of the member constituting the supporting member 29 having the frame shape shown in the first embodiment and the second embodiment described above is folded at the outer end and both end portions in the width direction of the wrappable straining mesh 27 that can be rolled between the folded portion and the inclined surface 29a may be configured to move.

This prevents the foreign particles trapped in the wrappable straining mesh 27 from leaking from both ends of the wrappable straining mesh 27 in the width direction (direction orthogonal to the rolling direction) to the downstream side. It is possible to further improve the effect.

Also, the mesh portion of the wrappable straining mesh 27 shown in the above-mentioned first embodiment and second embodiment may be a porous plate. In this case, the size of the hole depends on the average outer diameter of the foreign particles to be trapped and the pressure loss, so it may be set as appropriate based on the average outer diameter of the foreign particles and the pressure loss.

The present invention is not limited to the embodiments described above and various modifications are included in the present invention. For example, the embodiments are described in detail to facilitate the description of the present invention and the present invention is not limited to embodiments in which all of the described configurations are included. In addition, a part of the configurations of the certain embodiment can be replaced by the configurations of other embodiments or the configurations of other embodiments can be added to the configurations of the certain embodiment. In addition, for a part of the configurations of the individual embodiments, addition, removal, and replacement of the configurations of other embodiments can be performed.

1, 1a Straining system
2, 2a Strainer
3 Main fluid line pump
4 Back wash pump
5 Waste recovery apparatus
6 Upstream valve
7 Downstream valve
8 Drain valve
9 Inflow tube
10 Outflow tube
11 Drain tube
12 Controller
21 Main housing
22, 64 Second roller shaft
22a Inclined surface
23, 63 First roller shaft
23a Inclined surface
24 Second roller shaft support
25 First roller shaft support
26 Counter-rotating brush
27 Wrappable straining mesh
28 Outlet flange
29 Supporting member
29a Inclined surface
30 Drain
31 Roller shaft drive unit
32 Speed-increasing gear for Counter-Rotating brush
33 Inlet flange
34 Sensor
41 Tension control unit
42 Quantity of roll control unit
43 Timing of roll control unit
44 Back wash 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 body
62 Notch

Claims

A strainer which removes foreign particles from fluid introduced comprising:
an inlet portion which introduces fluid containing foreign particles;
a wrappable straining mesh which removes the foreign particles from fluid introduced through the inlet portion;
an outlet portion which makes the fluid penetrated from the wrappable straining mesh outflows;
a first roller shaft which rolls predetermined length of the wrappable straining mesh; and
a second roller shaft which rolls out predetermined length of the wrappable straining mesh,
wherein the first roller shaft faces the second roller shaft positioned predetermined distance therebetween, the wrappable straining mesh trap the foreign particles is rolled by the first roller shaft and fresh wrappable straining mesh is rolled out by the second roller shaft.
The strainer according to claim 1, further comprising a third roller shaft disposed to face the first roller shaft in a horizontal direction,
wherein a brush is provided on the outer peripheral surface of the third roller shaft to remove the foreign particles trapped in the wrappable straining mesh rolled 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,
wherein foreign particles removed from the wrappable straining mesh is discharged through the drain by the brush on the outer peripheral surface of the third roller shaft.
The strainer according to any one of claims 1 to 4,
further comprising a supporting member disposed between the first roller shaft and the second roller shaft to support the wrappable straining mesh,
wherein the supporting member includes a frame shape and the two members corresponding to both end portions of the wrappable straining mesh in the width direction have respectively inclined surface inclined outward in the width direction of the each member.
The strainer according to claim 5,
wherein the two members having the inclined surfaces constituting the supporting member have respectively a folded portion bent at the outer end portion thereof, both end portions in the width direction of the wrappable straining mesh are positioned between the inclined surface and the folded portion.
The strainer according to claim 6,
wherein the wrappable straining mesh supported by the supporting member is disposed to be orthogonal to the flow direction of the fluid containing the foreign particles.
The strainer according to claim 7,
wherein the first roller shaft and the second roller shaft are the driving rollers or the first roller shaft is the driving roller and the second roller shaft is the driven roller.
A straining system comprising:
a strainer for removing foreign particles contained in fluid;
an inflow tube for supplying fluid containing foreign particles to the strainer;
a main fluid line pump connected to the inflow tube;
a first valve installed at the inflow tube on the downstream side of the main fluid line pump and on the upstream side of the strainer;
an outflow tube for flowing fluid from which foreign particles has been removed by the strainer;
a drain tube for discharging foreign particles removed from the fluid by the strainer;
a waste recovery apparatus into which foreign particles flows through the drain tube; and
a controller,
the strainer further comprising:
an inlet portion which introduces fluid containing foreign particles;
a particles which removes the foreign particles from fluid introduced through the inlet portion;
an outlet portion which makes the fluid penetrated from the wrappable straining mesh outflows;
a first roller shaft which rolls predetermined length of the wrappable straining mesh; and
a second roller shaft which rolls out predetermined length of the wrappable straining mesh,
wherein the first roller shaft faces the second roller shaft positioned predetermined distance therebetween, the wrappable straining mesh trap the foreign particles is rolled by the first roller shaft and fresh wrappable straining mesh is rolled out by the second roller shaft.
The straining system according to claim 9,
the strainer further comprising:
a third roller shaft disposed to face the first roller shaft in a horizontal direction,
wherein a brush is provided on the outer peripheral surface of the third roller shaft to remove the foreign particles trapped in the wrappable straining mesh rolled by the first roller shaft.
The straining system according to claim 10,
wherein the rotation speed of the third roller shaft is faster than the rotation speed of the first roller shaft.
The straining system according to any one of claims 9 to 11,
the strainer further comprising:
a supporting member disposed between the first roller shaft and the second roller shaft to support the wrappable straining mesh,
wherein the supporting member includes a frame shape and the two members corresponding to both end portions of the wrappable straining mesh in the width direction have respectively inclined surface inclined outward in the width direction of the each member.
The straining system according to claim 12,
wherein the two members having the inclined surfaces constituting the supporting member have respectively a folded portion bent at the outer end portion thereof, both end portions in the width direction of the wrappable straining mesh are positioned between the inclined surface and the folded portion.
The straining system according to claim 13,
wherein the controller controls the first roller shaft to roll predetermined length of the wrappable straining mesh and controls the second roller shaft to roll out predetermined length of the wrappable straining mesh if the differential pressure between the inlet portion and outlet portion of the strainer exceeds the first threshold value.
The straining system according to claim 14,
wherein the controller controls the tension of the wrappable straining mesh by the first roller shaft or the second roller shaft driven to rotate based on the tension measurement value of the wrappable straining mesh and the rotation angle measurement values of the first roller shaft and the second roller shaft.
The straining system according to claim 15,
further comprising a back wash pump connected to the outflow tube on the upstream side of the second valve and on the downstream side of the strainer via branch tube,
wherein the controller controls that the main fluid line pump is stopped and the first valve is closed and the back wash pump is driven so that the cleaning liquid or the chemical cleaning agent introduced into the outflow tube through the second valve is pressurized and the washing liquid pressurized or chemical cleaning agent pressurized is introduced into the strainer through the outflow tube, and the foreign particles trapped in the wrappable straining mesh is removed by the water pressure of the cleaning liquid or the chemical cleaning with the chemical cleaning agent, and the foreign particles removed is discharged to the waste recovery apparatus through the drain tube.
The straining system according to claim 16,
wherein after back wash process, the controller drives the main fluid line pump and opens the first valve so that the differential pressure between the inlet portion and the outlet portion of the strainer exceeds predetermined second threshold value , the back wash process is repeatedly executed.
The straining system according to claim 16,
wherein the controller controls the main fluid line pump so as to open the first valve after the back wash process and if the differential pressure between the inlet portion and the outlet portion of the strainer is equal to or less than the predetermined second threshold value, the controller controls the second roller shaft to roll predetermined length of the wrappable straining mesh and controls the first roller shaft to roll out predetermined length of the wrappable straining mesh.
The straining system according to claim 17 or claim 18,
wherein the predetermined second threshold value is less than the predetermined first threshold value.