JP7399525B1 - Automatic cleaning system for filtration strainers - Google Patents

Abstract

The present invention provides an automatic cleaning system and automatic cleaning method for a filtration strainer that enables automatic cleaning of a filtration element at all times during filtration processing without discharging liquid to the outside of the machine. [Solution] A filtration element 2 having a backwashing function is provided in a strainer body 1 having an inlet through which the raw solution flows in and an outlet through which the filtrate flows out, and a backwashing liquid containing sludge is disposed in the outlet provided in the filtration element 2. A backwash liquid discharge pipe 10 to be discharged, a cyclone separator 20 connected to the backwash liquid discharge pipe 10 to separate liquid from sludge, a suction pipe 25 from which liquid is sucked out above the cyclone separator 20, and a vicinity of the inlet. an ejector 30 having a suction and supply function connected to a stock solution supply pipe located at the undiluted solution supply pipe, and a circulation circuit in which the liquid of the backwash liquid is sucked by the ejector 30 and circulated within the strainer main body 1 without being discharged outside the machine. At the same time, the backwashing function is always exhibited while the strainer main body 1 is in operation. [Selection diagram] Figure 1

Description

The present invention relates to a filtration strainer that filters water to be treated containing various solids and removes solids, and in particular, reduces liquid loss of stock solution and performs filtration without intermittent operation. The present invention relates to an automatic cleaning system for a filtration strainer that can constantly clean the filtration strainer .

A filtration strainer (filtration device) is equipped with a built-in screen (filtration element) with a certain opening in order to remove various foreign substances, solids, sludge, etc. contained in raw water (treated water, seawater, wastewater, water, etc.). ) is used as a prefilter.

This type of strainer is equipped with a filtration element inside the strainer body through which the water to be treated flows, and this filtration element not only allows the water to pass through, but also captures solid matter in the water to be treated and passes it to the downstream side of the strainer. is supplied with filtered water filtered by a filtration element.

If the filtration process using the strainer continues, solid matter will adhere and accumulate on the surface of the filtration element, increasing the pressure within the strainer body and reducing the filtration capacity. It is necessary to perform a cleaning process (maintenance work) to remove the

In Patent Document 1, the backwashing mechanism is rotated via a drive source such as a motor when the difference in pressure measured by pressure gauges provided at the inlet and outlet of the strainer reaches a predetermined value or at every predetermined time. The filter element is cleaned by rotating the shaft.

In this device, in order to remove sludge that does not settle under its own weight at the bottom of the equipment, it is sucked in by a suction pipe that has a backwash scraper body on the inner peripheral side of the filtration element and discharged to the outside of the machine.
During the cleaning operation, the drive unit is operated and the discharge valve is opened to release the atmosphere to the atmosphere, and the secondary side of the discharge pipe and the flow path of the rotating shaft are communicated, so that atmospheric pressure is applied to the backwash scraper body. It reaches the backwash port of the strainer, generates a pressure difference inside the strainer body, and while rotating the rotating shaft, suction is drawn from the suction part on the wide surface of the scraper body, and it is applied to the inner peripheral surface of the filtration element and the filtration hole. The filter element is cleaned by sucking the attached sludge, and the sucked sludge is discharged from the discharge pipe along with the liquid to the outside of the strainer.
Next, the drain valve is opened to generate a pressure difference by opening to the atmosphere, and the sludge that has settled under its own weight and accumulated at the bottom is discharged to the outside of the machine through the drain channel.

In this way, the filtration capacity of the filtration element is restored by intermittently opening the air to the atmosphere and performing a cleaning operation (discharging sludge from the discharge pipe through backwashing operation) and discharging sludge from the drain valve. .

Patent No. 7080465

Here, the solids contained in the raw water include fine particles, and it is necessary to use a screen (filtration element) with fine openings to remove fine particles of, for example, about 10 to 50 μm.

However, this screen with fine openings has the problem of clogging in a short period of time. Moreover, even if the clogging is cleared and the filtration ability is restored and the filtration operation is restarted, the filtration holes of the filtration element are immediately clogged with particles and the internal pressure increases. For this reason, in order to remove fine particles, the filtration operation must be stopped and maintenance work must be repeated frequently, which not only makes cleaning work time-consuming, but also prevents continuous filtration processing, resulting in poor operating efficiency. turn into.

In this way, with conventional equipment, when performing filtration processing targeting fine particles, clogging occurs quickly, so the filtration element must be cleaned frequently to restore its filtration capacity. Therefore, it was difficult to perform stable and continuous filtration operation without intermittent operation.

Furthermore, the liquid discharged outside the machine during the cleaning operation contains the undiluted solution of the product, and there is a need to reduce the amount of liquid to be discarded and increase the yield and yield of the product. When the liquid discharged from the strainer is returned to the tank, there is also the problem that the concentration of solids and fine particles increases in the returned tank.

Therefore, it has been desired to develop a filtration device that can automatically perform cleaning at all times even during filtration operation without intermittent operation, maintain stable filtration performance, and reduce liquid loss of stock solution.

The present invention was developed to solve the above problems, and its purpose is to enable automatic cleaning of the filtration element at all times during filtration processing without discharging liquid outside the machine. An object of the present invention is to provide an automatic cleaning system for a filtration strainer .

In order to achieve the above object, the invention according to claim 1 provides a cylindrical strainer main body having an inlet through which the stock solution flows in from a stock solution supply pipe, and a cylindrical strainer body that allows fine filtration of 10 to 50 μm inside the strainer main body. A type of filtration element is arranged, a filtration chamber is provided on the inner periphery of the strainer body and the outer periphery of the filtration element, a filtrate outlet that communicates with the filtration chamber is provided on the strainer body, and a rotating shaft rotatably provided within the filtration element. A backwash scraper is installed in the pipe in a radial direction, and the backwash scraper is used to backwash and suction the sludge that clogs the filtration element.A backwash liquid discharge pipe is connected to the lower end of the rotating shaft pipe, and the backwash liquid is A cyclone separator is installed in the discharge pipe to separate the sludge and the stock solution, a suction pipe is placed above the cyclone separator near the inlet to draw out the liquid, and an ejector is provided in the stock solution supply pipe for backwash suction. By configuring a circulation circuit with the washing liquid discharge pipe, suction pipe, and stock solution supply pipe connected to the ejector, the filtration mechanism and backwashing mechanism can be performed simultaneously while the strainer body is in operation, and the stock solution can be removed without discharging the stock solution during backwashing. This is an automatic cleaning system for filtration strainers that eliminates waste.

The invention according to claim 2 is an automatic cleaning system for a filtration strainer in which a sludge pod with a viewing window or a bag filter for collecting sludge is arranged below a cyclone separator.

According to the invention of claim 1, a cylindrical filtration element capable of fine filtration of 10 to 50 μm is disposed within the strainer body, and a cylindrical filtration element capable of fine filtration of 10 to 50 μm is arranged in a radial direction toward a rotating shaft tube rotatably provided within the filtration element. A backwash scraper is provided and the backwash function is always performed, so it is possible to filter fine particles of the stock solution, and the filtration mechanism and backwash mechanism can be performed simultaneously while the strainer body is in operation. By configuring a circulation circuit with a backwash liquid discharge pipe, a suction pipe, and a stock solution supply pipe connected to an ejector, it is possible to eliminate stock solution loss without discharging the stock solution during backwashing.

Therefore, by circulating the stock solution during backwashing through the circulation circuit without discarding it, we can eliminate liquid loss of the stock solution discharged outside the machine, and as a result, for example, the amount and yield of valuable filtrate such as whiskey can be reduced. can be improved. Furthermore, since the liquid containing sludge does not return to the tank containing the stock solution, there is no problem of increased concentration of sludge, foreign matter, etc. in the stock solution tank.

In addition, even if the sludge in the raw solution contains fine particles, the backwash function is activated during filtration operation to eliminate clogging of the filtration element, maintaining stable filtration performance without reducing filtration capacity. This enables continuous operation, eliminates the need for maintenance work, and significantly improves the value of use as an automatic cleaning system .

In addition, since liquid is supplied to the strainer body at a high flow rate by an ejector installed in the stock solution supply pipe near the inlet of the strainer body, swirling flow is likely to occur within the strainer body, which improves filtration performance and cleaning performance. backwash function).

In addition, inside the strainer body, for example, the rotary shaft tube in the filtration element is constantly rotated without power by a rotary water wheel provided in the strainer body by the driving force of a motor or the water flow of the stock solution flowing into the strainer body. The backwash scraper formed in the radial direction operates along the inner circumferential surface of the filtration element, so the backwash scraper scrapes and suctions the sludge that has clogged the filtration hole of the filtration element, and drains the backwash liquid into the backwash liquid discharge pipe. It is suitable for fine filtration elements with a diameter of 10 to 50 μm because it can discharge more water and improve cleaning efficiency.
Additionally, if a rotating water wheel is installed , the water flow will rotate the rotating shaft tube, making it possible to constantly clean the filtration element without having to provide a power source (motor, handle, etc.) to activate the backwashing function. It is possible to significantly reduce the cost of equipment.

According to the invention of claim 2 , since the sludge pod or bag fill with a viewing window for collecting sludge is provided below the cyclone separator, the backwash liquid containing sludge is separated into sludge and liquid by the cyclone separator, and the cyclone separator separates the backwash liquid containing sludge into sludge and liquid. Since the sludge discharged from the separator can be collected by the sludge pot or bag filter, the sludge can be collected without stopping the filtration operation.

1 is a schematic circuit diagram of an automatic cleaning system for a filtration strainer according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic cross-sectional view which shows the automatic cleaning system of the filtration strainer of 1st Embodiment in this invention. It is a schematic sectional view showing the automatic cleaning system of the filtration strainer of a 2nd embodiment. 1 is a schematic cross-sectional view showing an example in which the present invention is applied to a Y-type strainer.

EMBODIMENT OF THE INVENTION Below, embodiment of the automatic cleaning system of the filtration strainer and the automatic cleaning method of the filtration strainer in this invention is described in detail based on drawing.

FIG. 1 is a schematic circuit diagram of an automatic cleaning system for a filtration strainer according to the present invention. FIG. 2 is a schematic cross-sectional view showing an automatic cleaning system for a filtration strainer according to the first embodiment of the present invention.

As shown in FIGS. 1 and 2, the automatic cleaning system for a filtration strainer according to the present invention has a backwashing function in a strainer body 1 having an inlet 3 through which the stock solution flows in and an outlet 4 through which the filtrate flows out. A filtration element 2, a backwash liquid discharge pipe 10 through which the stock solution containing sludge flows out to a discharge port 14 provided in the filtration element 2, and a cyclone separator 20 connected to the backwash liquid discharge pipe 10 that separates the sludge from the liquid. It is configured to include a suction pipe 25 through which liquid is sucked and discharged above the cyclone separator 20, and an ejector 30 having a suction supply function and connected to a stock solution supply pipe 26 located near the inlet 3.
In this way, a circulation circuit is formed between the ejector 30, the strainer body 1, and the cyclone separator 20 (hereinafter abbreviated as "cyclone") in which the stock solution during backwashing circulates .

The automatic cleaning system combines an ejector, a cyclone, and a strainer to form a circulation circuit.The undiluted solution for backwashing flows into the circulation circuit, and the filtration element is constantly cleaned without discharging the undiluted solution. This is an automatic cleaning system that can clean automatically.

<Strainer>
The cylindrical strainer main body 1 includes an inlet 3 into which the stock solution flows, a filtration chamber 12 that houses a substantially cylindrical filter element 2 that filters the stock solution that flows in from the inlet 3, and a filtrate (filtrate) filtered by the filter element 2. An outflow port 4 through which filtered water (filtered water) flows out of the strainer body 1, a discharge chamber 13 provided at the lower part of the filtration chamber 12, a drain pipe 9 communicating with the discharge chamber 13, and a backwash liquid communicating with the discharge port 14. In addition to having a discharge pipe 10, the filter element 2 of the strainer body 1 is provided with a backwash scraper 5 and a suction nozzle 6 that perform a backwash function.

<Filtration element>
The filtration element 2 is provided in a vertical cylindrical shape with openings at the top and bottom, is fixedly held by a holding member 7, and is housed in the filtration chamber 12 of the strainer body 1. The filtration element 2 is configured to allow the undiluted solution flowing inward from the upper opening to pass toward the outer filtration chamber 12 to remove sludge (particles, solids, foreign matter, etc.) in the undiluted solution.
In this way, in this example, a filtration strainer is configured in which fluid flows from the inside to the outside of the filtration element for filtration processing.

In this example, in order to be able to remove fine solid matter (fine particles), the filtration element uses a mesh-like metal filter (sintered filter) with fine openings. Metal filters with fine mesh openings (filtration filters) are easily torn, so in addition to the filtration filters, multiple filters such as a reinforcing layer, a protective layer, and a dispersion layer are formed in a laminated state to achieve the desired strength and durability. It is configured to have
For example, when removing fine particles of about 10 to 50 μm contained in the stock solution, a filtration filter with apertures of about 10 to 50 μm can be used, but the filter should be selected as appropriate depending on the object to be filtered and the purpose. be able to.

<Backwashing means>
A backwash scraper 5 is provided on the inner peripheral side of the filter element 2 to eliminate clogging of the filter element. A plurality of backwash scrapers 5 are provided in the radial direction of the rotary shaft tube 8 and configured to be rotatable together with the rotary shaft tube 8. The suction nozzle 6 extends from the rotating shaft tube 8 toward the inner circumferential surface of the filter element 2, and is capable of suctioning sludge that has clogged and accumulated in the filter holes of the filter element 2 or floating sludge. It is set in.
In this example, the backwash scrapers 5 are provided above and below at intervals of 180 degrees, but they may be provided at intervals of 90 degrees, and the number, position, interval, etc. may be set as appropriate depending on the implementation. can do.

The suction nozzle 6 communicates with an inflow path 8a formed in the rotating shaft tube 8, and is provided so that the backwash port of the backwash scraper 5 connected to the suction nozzle 6 faces the inner circumferential surface of the filter element 2. The sludge sucked into the suction nozzle 6 from this backwashing port is configured to flow into the inflow path 8a together with the backwashing sucked stock solution .

A spring made of a coil spring is installed in the suction nozzle 6, and the elastic force of this spring urges the backwash scraper 5 toward the filter element. By urging the backwash scraper 5 by this spring, the backwash scraper 5 is pressed against the inner surface of the filter element 2 so that no gap is created between the backwash scraper 5 and the inner surface of the filter element 2 .

Although this example has been described with respect to a backwash scraper provided inside the filtration element, cases in which a scraper is provided outside the element or backwashing is performed by swirling flow within the strainer body are also included.

The backwash scraper 5 has a wide surface, and a backwash port having a predetermined length is provided on the wide surface, and the backwash port is formed into a narrow width. The flow path is provided in a wide-angle shape that widens from the backwash port toward the suction nozzle 6, and the backwash port increases the backwash flow rate to improve the cleaning efficiency of the filtration element 2.
The backwash scraper 5 may be configured integrally with or separately from a scraping part and a cleaning brush, and the scraping part and cleaning brush scrape off the sludge that has clogged the filter holes of the filter element 2, and remove the sludge from the suction nozzle. 6, the undiluted solution containing sludge can be discharged from the backwash liquid discharge pipe 10 by suction.

<Rotating shaft tube>
The rotary shaft tube 8 is rotatably provided within the filter element 2, and the rotary shaft tube within the filter element is configured to be able to rotate at all times due to the water flow within the strainer body 1 during filtration operation. Further, the rotating shaft tube 8 is connected to a connecting member 11 via a transmission fitting, and the connecting member 11 is provided with a deceleration mechanism (not shown), etc., so that the rotational speed of the rotating shaft tube 8 can be adjusted. However, the rotation speed of the backwash scraper 5 provided on the rotating shaft tube 8 is provided so as to be adjustable.
Further, the connecting member 11 may be configured by being connected to the driving unit 17, or may be connected to a driving device such as a motor to rotate the rotating shaft pipe 8 using an external driving force as a power source for backwashing. It may be possible to make the function work. Further, a manual device such as a handle may be attached to the connecting member 11 so that maintenance work can be performed by rotating the handle and manually exerting the backwashing function as needed.

In addition, as shown in a second embodiment shown in FIG. 3, which will be described later, the water turbine 18 is provided inside the strainer body 1 without being connected to a drive part, so that the rotary shaft tube inside the filtration element can be rotated at all times. You can.

The rotating shaft tube 8 is provided with an inflow path 8a into which the raw solution containing sludge sucked from the suction nozzle 6 flows. The stock solution for backwashing flowing out of the strainer main body 1 from 14 is provided so as to flow into the backwashing liquid discharge pipe 10.

<Drain piping>
The drain pipe 9 is provided so as to extend below the strainer main body 1 and communicates with the discharge chamber 13 at the bottom of the strainer main body 1. The drain pipe 9 is controlled to open and close by a valve 15 provided at the bottom of the strainer main body 1. The structure is such that accumulated sludge can be discharged.

<Backwash liquid discharge pipe>
One end side of the backwash liquid discharge pipe 10 communicates with the inflow path 8a of the rotary shaft pipe 8, and is configured so that the stock solution containing sludge from the filtration element 2 flows toward the discharge port 14. The other end of the backwashing liquid discharge pipe 10 is connected to the intake port 21 of the cyclone 20. Therefore, after the backwashing stock solution flowing through the backwashing liquid discharge pipe 10 flows out from the strainer body 1, The cyclone 20 is configured to send a raw solution containing sludge (solid) to the cyclone 20.
Further, the backwash liquid discharge pipe 10 is provided with a valve 16, which can be opened and closed manually or automatically to control communication with the cyclone 20. In addition, in order to improve the ability to send water to the cyclone 20, a water pump, an ejector, etc. may be provided.

<Cyclone separator>
The intake port 21 of the cyclone 20 is provided so that the undiluted solution containing sludge fed from the strainer body 1 can flow therein. A liquid outlet 22 located above the cyclone 20 is connected to a suction pipe 25 and is provided to communicate with a suction port 35 of an ejector 30, and a solids outlet 23 located below the cyclone 20 is connected to a suction pipe 25 to communicate with the suction port 35 of the ejector 30. It is configured to be connected to the pod 40.

Due to the centrifugal force of the undiluted solution containing sludge that has flowed into the cyclone 20, the solid component (sludge) gathers toward the outer periphery of the inverted cone-shaped cone , and the liquid component moves toward the inner cylinder. As it flows, the solid component and liquid component are separated, the separated liquid flows out from the liquid outlet 22, and the separated solid (sludge) flows out from the solid outlet 23.

The undiluted liquid separated by the cyclone 20 and flowing out from the liquid outlet 22 flows into the flow path in the undiluted solution supply pipe 26 through the suction port 35 of the ejector 30, and then flows through the ejector 30 to the inlet of the strainer body 1. 3.

Further, the sludge separated by the cyclone 20 flows out from the solid outlet 23 and is deposited in the sludge pod 40. In this example, the sludge pod 40 has a viewing window 40a, so it is possible to check the state of the sludge deposited in the sludge pod 40, and the sludge can be collected at a predetermined timing without stopping the filtration operation. .

Further, a valve 27 is provided below the sludge pod, and the sludge (solid) can be recovered by controlling opening and closing. By configuring the valve 27 as an automatic valve, sludge (solid) can be automatically collected by controlling opening and closing at predetermined times and intervals.
Note that a bag filter may be arranged at the solid outlet 23 below the cyclone 20 so that the sludge can be collected.

<Ejector>
The ejector 30 is equipped with a nozzle part 31 and a diffuser part 32 in the ejector main body, and the ejector 30 is driven by the stock solution flowing in from the inlet 33, and increases the pressure of the fluid (liquid) sucked in from the suction port 35 within the ejector main body. The ejector 30 is disposed near the inlet 3 of the strainer body 1 of the stock solution supply pipe 26 so that the fluid can be supplied at a high flow rate.

A discharge port 34 of the ejector 30 is connected to the inlet 3 of the strainer body 1, and a suction port 35 of the ejector 30 is connected to the liquid outlet 22 of the cyclone 20 via a suction pipe 25.
When the undiluted solution is sent to the undiluted solution supply pipe 26 by a pump (not shown) installed on the inlet 33 side of the ejector 30, the nozzle part 31 injects the stock solution at high speed, creates a low-pressure space inside the ejector body, and sends the stock solution to the suction pipe 25. The undiluted solution for backwashing is sucked through the connected suction port 35 and flows into the undiluted solution supply pipe 26, and the pressure of this liquid and the undiluted solution is increased by the diffuser section 32 of the ejector 30 to increase the flow rate. The inflow port 3 is supplied with the stock solution and the stock solution for backwashing from which the sludge has been separated .

In this way, a circulation circuit is formed between the strainer body 1, the cyclone 20, and the ejector 30, and when the strainer body 1 is operated for filtration, the stock solution for backwashing is always kept in the circulation circuit. The undiluted liquid during backwashing is not discharged outside the machine.

<Action/Effect>
Next, the functions and effects of the automatic filter strainer cleaning system of the present invention will be explained.

By feeding the stock solution to the stock solution supply pipe 26 using a pump or the like, the stock solution flows into the inlet 33 of the ejector 30 and is discharged from the discharge port 34 at a high flow rate. The discharge port 34 is connected to the inlet 3 of the strainer body 1, and the stock solution is supplied into the strainer body 1, and a swirling flow is generated in the strainer body 1 by the inflow of fluid with a high flow velocity.

The undiluted liquid flows in from the upper opening of the filtration element 2, and the undiluted liquid that has passed through the filtration element 2 passes through the filtration chamber 12, where sludge is removed and is discharged as filtrate from the outlet 4 to the outside of the strainer body 1. As a result, a filtrate is supplied and a filtration operation is performed.

When the filtration operation of the strainer body 1 is operated, a part of the liquid in the strainer body 1 is sucked into the backwash nozzle 6 connected to the backwash scraper 5 and flows into the inflow path 8a of the rotating shaft pipe 8. . Since the flow direction of this liquid is the same as the flow direction when cleaning the filter element 2 in the strainer body 1, it acts as a backwash liquid.

That is, within the strainer body 1 , the sludge and stock solution adhering to the filter holes and the surface of the filter element 2 are sucked in by the suction nozzle 6 , and a backwashing function for eliminating clogging of the filter element 2 is performed.

Furthermore, the rotary shaft tube 8 is rotatably provided inside the filtration element 2, and is constantly rotated by the water flow within the strainer body 1 during filtration operation, so that the backwash scraper 5 provided on the rotary shaft tube 8 is attached to the filtration element 2. It operates along the inner circumferential surface of the filter element 2 to scrape off sludge that has clogged the filter holes of the filter element 2 or that has adhered to the surface, and suctions it with the suction nozzle 6 to constantly exert a backwashing function. , clogging of the filter element 2 can be eliminated.

In this way, the cleaning operation to eliminate clogging of the filter element 2 can be performed simultaneously with the filtering operation. In addition, during filtration operation, the water flow inside the strainer body 1 allows the backwashing function to be performed without power, so there is no need for an external power source to drive the backwashing function, and the filtration is performed automatically. The element 2 can be cleaned.

The undiluted solution containing sludge sucked from the suction nozzle 6 flows into the inflow path 8a of the rotary shaft tube 8, and flows into the backwash liquid discharge pipe 10 connected to this inflow path 8a, and the undiluted solution containing the sludge flows into the backwash liquid discharge pipe 10 connected to this inflow path 8a. The water flows out of the strainer main body 1 and is then sent to the cyclone separator 20 connected to the backwash liquid discharge pipe 10.

The undiluted solution containing sludge is separated into liquid and sludge (solid) by the cyclone separator 20, and the separated undiluted solution is discharged from the liquid outlet 22 and the suction port of the ejector connected to the suction pipe 25. 35 , the stock solution for backwashing flows into the flow path of the stock solution supply pipe 26 .

On the other hand, the sludge separated from the stock solution during backwashing is discharged from the solid discharge port 23 of the cyclone 20 and deposited in the sludge pod 40. The sludge accumulated in the sludge pod 40 can be collected at a predetermined timing.

Here, only the undiluted solution for backwashing separated by the cyclone 20 is again supplied to the inlet 3 of the strainer body 1 together with the undiluted solution, and the undiluted solution for backwashing is transferred between the strainer body 1 and the cyclone 20. It becomes possible to constantly circulate in the circulation circuit formed by the ejector 30 and the ejector 30.
In this way, the liquid stock solution during backwashing is constantly circulated within the system without being discharged outside the machine, so the stock solution liquid is not discharged outside the machine and disposed of.

Therefore, by circulating the undiluted liquid during backwashing through the circulation circuit without discarding it, the loss of the undiluted solution during backwashing that is discharged outside the machine is reduced, and as a result, the loss of the liquid contained in the undiluted solution is reduced. At the same time, the amount of filtrate recovered and the yield can be improved. Furthermore, since the liquid containing sludge does not return to the tank containing the stock solution, there is no problem of increased concentration of sludge, foreign matter, etc. in the stock solution tank.

In addition, since the liquid that is the stock solution during backwashing is constantly circulated within the circulation circuit when the strainer body 1 is in operation (filtering operation), a flow of liquid that backwashes the filtration element 2 is generated within the strainer body 1. Thus, the filter element 2 inside the strainer body 1 can be automatically cleaned. Therefore, even if the sludge in the stock solution contains fine particles, the backwashing function is always exerted during the filtration operation to eliminate clogging of the filtration element 2, and the filtration capacity is not reduced.

Therefore, the filtration element 2 of the strainer body 1 maintains stable filtration performance and can be operated continuously.Moreover, since the filtration element 2 can be automatically cleaned, no maintenance work is required and the value of use can be increased. .

In addition, during the filtration operation, the backwash scraper 5 formed in the radial direction of the rotating shaft tube 8 operates along the inner peripheral surface of the filter element 2, and the backwash scraper 5 prevents the filter hole of the filter element 2 from being clogged. Since the sludge is scraped off, suctioned, and discharged from the backwash liquid discharge pipe 10, cleaning efficiency can be improved.

In addition, since a sludge pod or bag fill with a viewing window for collecting sludge is provided below the cyclone 20, the undiluted solution containing sludge is separated into sludge and liquid by the cyclone 20, and the sludge discharged from the cyclone 20 is converted into sludge. Since the sludge can be collected using a pot or a bag filter, only the sludge can be collected without stopping the filtration operation.

<Second embodiment>
Next, a second embodiment will be described. The second embodiment is an example of an embodiment in which the rotating shaft tube 8 is configured to be rotatable without power in the automatic cleaning system for a filtration strainer of the present invention. The same configurations as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the embodiment shown in FIG. 3, the rotating shaft tube 8 is rotatably provided in the filtration element 2, and during the filtration operation, the water flow of the stock solution flowing into the strainer body 1 is used to form a substantially bowl-shaped rotary shaft tube 8 provided in the strainer body 1. The rotary shaft tube 8 in the filtration element 2 is configured to be able to rotate at all times by the rotary water wheel 18. That is, in this embodiment, the ejector 30 increases the flow velocity and the raw liquid that flows in collides with the rotary water wheel 18. Since the rotary shaft tube 8 rotates via the rotary water wheel 18, the rotary shaft tube 8 rotates without requiring an external driving force.

In this example, a plurality of bowl-shaped rotary water turbines 18 are provided on the rotating shaft tube 8, but the shape of the water turbine may be other shapes. In addition, the method of applying the automatic cleaning system in this example and driving it in a non-powered state is not limited to the rotary water wheel, and may be any other means depending on the implementation.

In the second embodiment, in addition to the effects of the first embodiment, when the undiluted solution flows into the strainer main body 1 during the filtration operation, the rotating water wheel provided in the strainer main body 1 is activated by the water flow of the undiluted solution flowing into the strainer main body 1. 18 rotates, and the rotary shaft tube 8 rotates through the rotation of the rotary water wheel 18, so there is no need for external power, and the rotary shaft tube 8 inside the filter element 2 rotates at all times during filtration without power. , it becomes possible to operate the backwash function.

In addition, during filtration operation, the backwash function operates without power, eliminating the need for a separate power source and allowing the filtration element 2 to be automatically cleaned at all times, unattended, reducing equipment costs and maintenance work. can be significantly reduced.

Further, since the rotary water wheel 18 is bowl-shaped, the water wheel 18 can easily receive the momentum of the inflowing stock solution and can be rotated efficiently, so that the energy for rotating the rotary shaft tube 8 can be efficiently transmitted.

<Automatic cleaning method for filtration strainer>
Next, a method for automatically cleaning a filtration strainer according to the present invention will be explained. The method for automatically cleaning a filtration strainer of the present invention can be implemented based on the automatic filtration strainer cleaning system of the above embodiment, but is not limited thereto.

The automatic cleaning method for a filtration strainer of the present invention includes a filtration step in which a stock solution is supplied through a stock solution supply pipe, flows into the inlet of the strainer body, and is filtered by a filtration element in the strainer body; A backwash step in which the inner and outer peripheries of the liquid are backwashed, a separation step in which the backwash liquid containing sludge is separated into sludge and liquid using a cyclone separator, and a suction step in which the liquid is sucked in by an ejector installed in the stock solution supply pipe. and a supply step.

By supplying suction and circulating the separated liquid inside the strainer body, the backwashing liquid can be circulated through the backwashing step while the strainer is in operation, without discharging the backwashing liquid to the outside of the machine. There is.

<Filtration step>
In the filtration step, the stock solution is supplied through the stock solution supply pipe, flows into the inlet of the strainer body, and is filtered by the filtration element inside the strainer body. The raw solution to be filtered is supplied to the strainer main body at a high flow rate and flow rate, and the stock solution to be filtered flows into the filter element, and the water flow is generated inside the strainer main body and filtered by the filter element.
Note that when the strainer body is cylindrical, swirling flow is likely to occur within the strainer body because the flow flows along the inner circumferential surface of the cylindrical body.

<Backwash step>
In the backwashing step of backwashing the inner and outer circumferences of the filtration element simultaneously with the filtration step, backwashing to eliminate clogging of the filtration element is performed by backwashing means using water flow within the strainer body.
As long as the filtration step and the backwashing step can be performed simultaneously, the backwashing means is not particularly limited, but as long as it has a mechanism for removing sludge using water flow and can discharge the sludge outside the strainer. good. Note that cleaning efficiency can be increased by using a combination of a plurality of backwashing means such as a backwash scraper and a backwash brush.

<Separation step>
The separation step involves separating the backwash liquid containing sludge into sludge and liquid using a cyclone separator after the backwash step.The separation step involves sending the backwash liquid containing sludge, which was sucked and discharged from the strainer body in the above backwash step, to the cyclone separator. Then, the sludge of the backwash liquid and the liquid of the backwash liquid are separated by a cyclone separator.
The cyclone separator is not particularly limited as long as it can separate the sludge and the backwash liquid, but it is preferably implemented based on the system of the first embodiment or the second embodiment.

<Suction supply step>
The suction supply step in which the liquid is suctioned by an ejector provided in the stock solution supply pipe includes sucking only the liquid of the backwash liquid separated in the above separation step with the ejector, and causing this liquid to flow into the flow path of the stock solution supply pipe. Then, supply backwash liquid to the strainer body through the stock solution supply pipe.

By providing all of the above steps, during the filtration process, a flow is generated in which the backwash liquid circulates in the strainer body, and the backwash liquid is not discharged to the outside of the machine. In addition to the circulation of this backwash liquid, the strainer body simultaneously performs a filtration operation and a backwash operation.

Therefore, this automatic cleaning method for a filtration strainer involves a filtration step in which the stock solution is supplied through a stock solution supply pipe and allowed to flow into the inlet of the strainer body, and the stock solution is filtered by a filtration element inside the strainer body. carrying out a backwash step of washing the filtration element with a water stream, and then carrying out a separation step in which the backwash liquid containing sludge is sent to a cyclone separator to separate it into sludge and liquid; A suction supply step is performed in which only this separated liquid is sucked by an ejector provided in the stock solution supply pipe.

Therefore, only the liquid separated by the cyclone separator is sucked into the ejector and supplied to the strainer body again, so the backwash liquid is reused and circulated, and the backwash liquid is removed from the machine. There is no discharge.
Therefore, the amount of backwash liquid to be discarded can be reduced, the loss of liquid contained in the stock solution can be reduced, and the amount and yield of filtrate recovered can be improved. Further, since the liquid containing sludge does not return to the tank containing the stock solution, there is no problem of increased concentration of sludge or foreign matter in the stock solution tank.

In the strainer body, during the filtration process, a flow occurs in which the liquid of the backwash liquid circulates inside the strainer body, and the backwash liquid is circulated, so the filtration step and the backwash step are performed. This can be done simultaneously inside the strainer body, and during the filtration step, clogging of the filtration element inside the strainer body is suppressed and automatic cleaning can be performed, eliminating the need for intermittent operation to clean the filtration element. Become.

Therefore, the filtration ability of the filtration element during the filtration process is stabilized, so even in the filtration process to remove fine particulate sludge, the problem of the filtration ability being reduced due to clogging of the filtration element does not occur, so it can be carried out suitably. .

Further, since the sludge can be discharged outside the system without being exposed to the atmosphere and only the sludge can be recovered, it can be applied to, for example, a Y-type strainer or a T-type strainer.

<Other examples>
Next, an example in which the automatic filter strainer cleaning system of the present invention is applied to a Y-shaped strainer will be described. FIG. 4 is a schematic cross-sectional view showing an automatic cleaning system in which the present invention is applied to a Y-type strainer. The same configurations as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 4, an ejector 30 is provided near the inlet 53 of the Y-type strainer body 50, and the outlet 56 of the Y-type strainer body 50 is connected to the cyclone 20 via the backwash liquid discharge pipe 10. The liquid outlet 22 of the cyclone 20 communicates with the suction port 35 of the ejector 30.
Similar to the above embodiment, a circulation circuit is formed between the strainer main body 50, the cyclone 20, and the ejector 30, and the backwash liquid is configured to be able to circulate within this circuit.

The Y-type strainer main body 50 includes a filter element 2 and a backwash brush 55 for eliminating clogging of the filter element 2. The backwash brush 55 is rotatably provided on the rotation shaft 52, and the backwash brush 55 of the Y-shaped strainer main body 50 rotates to clean the inner surface of the filter element 2.
The rotation shaft 52 is connected to the operation handle 51 and is provided so that the backwash brush 55 is rotated by manual operation of the handle 51.

During the filtration operation, the ejector 30 provided in the stock solution supply piping 26 supplies the stock solution at a high flow rate to the inlet 53 of the Y-shaped strainer body 50, and the supplied stock solution flows into the Y-shaped strainer body 50. The filtrate flows into the built-in filtration element 2, where sludge and the like are removed, and the filtrate can be supplied from the outlet 54 of the Y-shaped strainer main body 50 for filtration treatment.

Further, the backwash liquid containing sludge discharged from the discharge port 56 of the strainer body 50 is sent to the cyclone 20 via the backwash liquid discharge pipe 10, and the backwash liquid containing sludge is separated into sludge and liquid. Then, only the sludge is discharged from the solid discharge port 23.
Then, the separated liquid is sucked from the suction port 35 of the ejector, flows into the flow path of the stock solution supply pipe 26, and is supplied to the inlet port 53 of the strainer main body 50, so that only the liquid of the backwash liquid is circulated. circulate within the circuit. Therefore, the liquid of the backwash liquid is circulated without being discharged to the outside of the machine, so that the amount of the backwash liquid to be discarded can be reduced and the loss of the stock solution can be reduced.

Therefore, even if a water suction pump is placed on the secondary side of the Y-type strainer, the liquid containing sludge is sent to the cyclone 20 without being released to the atmosphere, and the sludge separated by the cyclone 20 is turned into solids. Sludge can be collected even under a negative pressure environment by flowing out from the discharge port 23.
Moreover, since the accumulation of sludge within the Y-shaped strainer main body 50 can be suppressed, the filtration ability will not be reduced. Furthermore, without stopping the filtration operation, the handle 51 can be operated as appropriate to rotate the backwash brush 55 of the Y-shaped strainer main body 50 to clean the inner surface of the filtration element 2 and restore the filtration capacity. can.

In this way, in the automatic cleaning system in which the present invention is applied to a Y-type strainer, the backwash liquid is constantly circulated without stopping the filtration operation, and the backwash liquid containing sludge is sent to the cyclone. It is possible to discharge only the sludge with the cyclone 20.
Even if the inside of the Y-type strainer 50 is under a negative pressure environment, sludge can be collected, cleaning work to remove sludge is not required, and sludge can be prevented from accumulating inside the Y-type strainer main body 50. There is no problem that the filtration capacity of the filtration element 2 is reduced.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above, and the scope of the present invention does not depart from the spirit of the invention as described in the claims of the present invention. It is possible to make various changes.

Although the filtration element built into the strainer in the above embodiment performs filtration processing from the inside to the outside, it may also perform filtration processing from the outside to the inside.

A pressure gauge and a pump with adjustable flow rate are installed at the backwash liquid discharge piping and strainer inlet and outlet to monitor the pressure and flow rate within the automatic cleaning system, and adjust the water flow rate and flow rate using an external control device. The flow rate may be configured to be adjustable.

1 Strainer main body 2 Filtration element 3 Inflow port 4 Outflow port 5 Backwash scraper 6 Suction nozzle 7 Holding member 8 Rotating shaft pipe 8a Inflow path 9 Drain pipe 10 Backwash liquid discharge pipe 11 Connecting member 12 Filtration chamber 13 Discharge chamber 14 Discharge port 15 Valve 16 Valve 17 Drive unit 18 Rotating water wheel 20 Cyclone separator (cyclone)
21 Intake port 22 Liquid discharge port 23 Solid discharge port 24 Valve 25 Suction pipe 26 Stock solution supply pipe 27 Valve 30 Ejector 31 Nozzle section 32 Diffuser section 33 Inlet port 34 Discharge port 35 Suction port 40 Sludge pod 40a Peephole 50 Y-type strainer Main body 51 Handle 52 Rotating shaft 53 Inflow port 54 Outflow port 55 Backwash brush 56 Discharge port

Claims (2)

A cylindrical strainer main body having an inlet through which the stock solution flows from a stock solution supply pipe is provided, a cylindrical filter element capable of fine filtration of 10 to 50 μm is arranged within the strainer main body, and the inner periphery of the strainer main body is A filtration chamber is provided on the outer periphery of the filtration element, a filtrate outlet communicating with the filtration chamber is provided in the strainer body, and a backwash scraper is installed in the radial direction of a rotating shaft tube rotatably provided within the filtration element. is provided, and the backwash scraper backwashes and suctions the sludge that clogs the filter element, and a backwash liquid discharge pipe is connected to the lower end of the rotary shaft pipe, and the sludge and undiluted solution are connected to the backwash liquid discharge pipe. A cyclone separator for separating the liquid is provided, a suction pipe for sucking and outflowing the liquid above the cyclone separator is located near the inflow port, an ejector for backwash suction is provided in the raw solution supply pipe, and the backwash liquid is By configuring a circulation circuit with the discharge pipe, the suction pipe, and the stock solution supply pipe connected to the ejector, a filtration mechanism and a backwashing mechanism are simultaneously executed while the strainer main body is in operation, and the stock solution is discharged during backwashing. An automatic cleaning system for filtration strainers that is characterized by eliminating the loss of stock solution. 2. The automatic cleaning system for a filtration strainer according to claim 1, further comprising a sludge pod with a viewing window or a bag filter arranged below the cyclone separator to collect sludge.

Images