CN211189229U - Combined filtering system - Google Patents

Abstract

The utility model provides a combined filtering system, which relates to the technical field of water treatment and comprises a liquid inlet header pipe and at least one filtering device communicated with the liquid inlet header pipe; the filtering device comprises a primary filter, a security filter and a sand-water separator which are sequentially arranged along the flowing direction of the liquid; because at least one filtering device filters the liquid in the liquid inlet main pipe, the filtering device comprises a primary filter, a security filter and a sand-water separator, the primary filter and the security filter are combined, the security filter filters the liquid filtered by the primary filter again, and compared with the single use of the primary filter, the filtering precision is obviously improved; and the sand-water separator can carry out filtering separation to the filter granules when primary filter carries out the back flush to collect and reuse the filter granules who separates, practiced thrift the operation cost.

Description

Combined filtering system

Technical Field

The utility model belongs to the technical field of the water treatment technique and specifically relates to a modular filtration system is related to.

Background

With the shortage of water resources, the treatment and reuse of water resources become a necessary means, and the most common water treatment method is filtration by a filtration device.

The more commonly used filtering devices are sand filter tank type filters and ultrafiltration membrane type filters; the gap between the quartz sand particles filled in the sand filter tank type filter is large, the filtering precision is low, and the requirement cannot be met; the ultrafiltration membrane type filter has high filtration precision, but the cost of replacing the filter membrane is high, and the requirement of the filter membrane on the temperature of the use environment is high.

With the progress of filtration technology, a filter of porous particulate material has appeared, the filtration precision of which is between that of a sand filter tank type filter and that of an ultrafiltration membrane type filter; however, the filter which only depends on the porous particle material cannot meet the sewage treatment requirement, and the filter which carries out reverse cleaning on the porous particle material is easy to cause filter particle loss, thereby having great influence on the operation cost.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a modular filtration system to it is limited to sewage treatment ability to have alleviated the filter that relies on porous particle structure alone, and leads to the technical problem that the filter granule runs off easily when carrying out reverse cleaning.

In order to solve the technical problem, the utility model provides a technical scheme lies in:

the utility model provides a combined filtering system, which comprises a liquid inlet header pipe and at least one filtering device communicated with the liquid inlet header pipe;

the filtering device comprises a primary filter, a security filter and a sand-water separator which are sequentially arranged along the flowing direction of liquid, the primary filter is communicated with the liquid inlet main pipe, porous filtering particles are arranged in the primary filter, the primary filter and the security filter are both communicated with the liquid outlet main pipe, and the security filter can filter the liquid filtered by the primary filter again and collect the liquid into the liquid outlet main pipe;

the primary filter and the sand-water separator are both in communication with a blowdown header and the sand-water separator is configured to filter out filtered particles entering the blowdown header upon a back flush of the primary filter.

Further, the device also comprises a backwashing water main pipe and a backwashing gas main pipe communicated with a gas source;

the primary filter is communicated with the blowdown header pipe through a first forward blowdown pipe, a first reverse blowdown pipe and a first exhaust pipe respectively, the primary filter is communicated with the liquid outlet header pipe through a first exhaust pipe, the primary filter is communicated with the backwashing water header pipe through a first liquid inlet pipe, and the primary filter is communicated with the backwashing gas header pipe through a first air inlet pipe.

Further, the primary filter is configured with a forward running state, a forward cleaning state and a reverse cleaning state;

in the forward running state, liquid in the liquid inlet main pipe enters the primary filter for filtering, and then is discharged into the liquid outlet main pipe through the first liquid discharge pipe;

under the forward cleaning state, liquid in the liquid inlet main pipe enters the primary filter to be positively cleaned, and then is discharged into the sewage main pipe through the first forward sewage discharge pipe;

in the reverse cleaning state, a backwashing pump arranged on the backwashing water main pipe pumps liquid in the backwashing water main pipe into the primary filter through the first liquid inlet pipe for reverse flushing, and then the liquid is discharged into the sewage main pipe through the first reverse sewage discharge pipe; and gas in the backflushing gas main pipe enters the primary filter through the first gas inlet pipe to be backflushed, and the flushed waste gas is discharged into the blowdown main pipe through the first exhaust pipe.

Further, the cartridge filter is respectively communicated with the liquid outlet main pipe through a second liquid inlet pipe and a second liquid outlet pipe, and a first shunt control valve is arranged on the liquid outlet main pipe and between the second liquid inlet pipe and the second liquid outlet pipe;

the cartridge filter is communicated with the backflushing air main pipe through a second air inlet pipe, and the cartridge filter is communicated with the blowdown main pipe through a second blowdown pipe.

Further, the cartridge filter is configured with a forward filtering state and a reverse blowdown state;

in the forward filtering state, the liquid filtered by the primary filter in the liquid outlet main pipe enters the cartridge filter through the second liquid inlet pipe for filtering, and then is discharged into the liquid outlet main pipe through the second liquid discharge pipe;

in the reverse pollution discharge state, gas in the backflushing gas main pipe enters the cartridge filter through the second gas inlet pipe, liquid in the liquid outlet main pipe enters the cartridge filter through the second liquid inlet pipe, and then is discharged into the pollution discharge main pipe through the second pollution discharge pipe.

Furthermore, the sand-water separator is communicated with the sewage main pipe through a third liquid inlet pipe, a third liquid outlet pipe and a third sewage discharge pipe respectively, and a filter material collector is connected to the third sewage discharge pipe in series; a second branch control valve is arranged on the sewage main pipe and between the third liquid inlet pipe and the third sewage discharge pipe;

the backflushing air manifold is communicated with the sand-water separator through a third air inlet pipe, and the liquid outlet manifold is communicated with the sand-water separator through a fourth liquid inlet pipe.

Further, the sand-water separator is configured with a forward sand filtering state, a reverse sand washing state and a sand discharging state;

in the forward sand filtering state, liquid in the sewage main pipe enters the sand-water separator through the third liquid inlet pipe for filtering, and then is discharged into the sewage main pipe through the third liquid discharge pipe;

in the reverse sand washing state, gas in the backflushing gas main pipe enters the sand-water separator through the third gas inlet pipe, liquid in the liquid outlet main pipe enters the sand-water separator through the third liquid inlet pipe, and then gas-liquid two phases are discharged into the sewage main pipe through the third liquid outlet pipe;

and in the sand discharge state, liquid in the sand-water separator is discharged into the main sewage discharge pipe through the third sewage discharge pipe, so that the filter material collector collects the filter material.

Further, the primary filter comprises a container body, a first seal head and a second seal head;

the container comprises a container body, and is characterized in that the first seal head is connected with the bottom of the container body in a sealing manner, the second seal head is connected with the top of the container body in a sealing manner, the first seal head is provided with a first water outlet, the second seal head is provided with a second water outlet, and the side wall of the container body is provided with a water inlet.

Furthermore, a flow guide part is arranged on the inner wall of the container body and used for guiding liquid flowing along the inner wall of the container body to the filter particles.

Furthermore, the flow guide part comprises a plurality of flow guide ring bodies which are sequentially arranged along the length direction of the container body, and the plurality of flow guide ring bodies are hermetically connected with the inner wall of the container body;

the top surface of the flow guide ring body is perpendicular to the inner wall of the container body, and the bottom surface of the flow guide ring body is provided with a cambered surface with the diameter decreasing from bottom to top.

Further, the first seal head comprises a seal head body and a seal head flange fixedly connected to the seal head body;

the sealing head flange is provided with a containing groove, a sealing gasket is arranged in the containing groove, the bottom end of the container body extends into the containing groove and is supported on the sealing gasket, and the containing groove is filled with sealant.

Furthermore, a container flange is arranged on the outer wall of the container body and is connected with the seal head flange through a connecting piece.

Further, fixedly connected with supporting part in the first head, can dismantle on the supporting part and be connected with the portion that closes of lid, the supporting part with it is equipped with to separate the net to press from both sides between the portion that closes of lid, filter particle support in separate on the net.

Further, the supporting part comprises a supporting flange and a plurality of first supporting plates connected with the supporting flange, and the supporting flange is fixedly connected to the inner wall of the first seal head;

the lid closes the portion including lid close flange and a plurality of with lid close flange joint's second backup pad, lid close the flange with support the flange and can dismantle the connection, separate the net clamp and locate first backup pad with between the second backup pad.

Further, the cartridge filter comprises a filter tank and at least one filter element;

the filter tank body is internally provided with an installation plate, the installation plate divides the filter tank body into a liquid inlet cavity and a liquid outlet cavity, the top of the filter tank body is provided with a filter tank exhaust port communicated with the liquid inlet cavity, the side part of the filter tank body is provided with a filter tank liquid inlet and a filter tank sewage outlet communicated with the liquid inlet cavity, and the bottom of the filter tank body is provided with a filter tank liquid outlet communicated with the liquid outlet cavity;

the filter element is arranged on the mounting plate, and liquid in the liquid inlet cavity enters the liquid outlet cavity after being filtered by the filter element.

Further, the filter element comprises a filter element body, a porous central tube and a flow dividing part arranged in the porous central tube;

the filter element body is sleeved outside the porous central tube, liquid in the liquid inlet cavity enters the porous central tube after being filtered by the filter element body, a central tube air inlet is formed in the bottom end of the porous central tube, and a central tube water outlet is formed in the side wall of the porous central tube;

the flow dividing part is used for dispersing gas entering the porous central tube through the central tube gas inlet, so that the gas is diffused along the radial direction of the filter element body.

Further, the flow dividing part comprises a central shaft rod and a plurality of flow dividing sheets which are sequentially arranged along the central shaft rod;

the central shaft rod is arranged in the porous central tube, and the top end of the central shaft rod is connected with the top of the filter element body through a connecting part;

the flow distribution piece with the center pin pole can be dismantled and be connected to can adjust arbitrary adjacent two distance between the flow distribution piece, arbitrary adjacent two the flow distribution piece with enclose between the filter core body and establish into the reposition of redundant personnel cavity, gaseous passing through the center tube air inlet enters into a plurality ofly in proper order in the reposition of redundant personnel cavity.

Further, the particle size of the filter particles is set to be 0.5-1.6mm, the porosity is set to be 73-85%, and the thickness of a filter layer formed by the filter particles is not less than 1.5 m.

Further, the filter particles comprise volcanic rock and/or sintered microporous particles.

Furthermore, the container body is made of PVC material.

Technical scheme more than combining, the utility model discloses the beneficial effect who reaches lies in:

the utility model provides a combined filtering system, which comprises a liquid inlet header pipe and at least one filtering device communicated with the liquid inlet header pipe; the filtering device comprises a primary filter, a security filter and a sand-water separator which are sequentially arranged along the flowing direction of liquid, a liquid inlet main pipe is communicated with the primary filter, porous filtering particles are arranged in the primary filter, the primary filter and the security filter are both communicated with a liquid outlet main pipe, and the security filter can filter the liquid filtered by the primary filter again and converge into the liquid outlet main pipe; the primary filter and the sand-water separator are both in communication with the blowdown header and the sand-water separator is configured to filter and separate filtered particles entering the blowdown header upon back flushing of the primary filter.

Because at least one filtering device filters the liquid in the liquid inlet main pipe, the filtering device comprises a primary filter, a security filter and a sand-water separator, the primary filter and the security filter are combined, the security filter filters the liquid filtered by the primary filter again, and compared with the single use of the primary filter, the filtering precision is obviously improved; and the sand-water separator can carry out filtering separation to the filter granules when primary filter carries out the back flush to collect and reuse the filter granules who separates, practiced thrift the operation cost.

Drawings

For a clear explanation of the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a combined filtering system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a combined filtering system according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a primary filter in a modular filtration system according to an embodiment of the present invention;

FIG. 4 is an enlarged view of A in FIG. 3;

fig. 5 is a schematic structural view illustrating a connection between a container body and a first sealing head in a primary filter according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view taken along line K-K of FIG. 5;

fig. 7 is a schematic structural view illustrating a connection between a sealing flange and a container flange in a primary filter according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a security filter in a combined filtering system according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a filter element in a security filter according to an embodiment of the present invention;

fig. 10 is a schematic view of gas movement during a reverse blowdown phase of a cartridge filter according to an embodiment of the present invention.

Icon: 100-a liquid inlet header pipe; 110-a liquid inlet branch pipe; 200-a primary filter; 210-a container body; 211-a first water outlet; 212-a second water outlet; 213-a water inlet; 220-a first end enclosure; 221-a head body; 222-a head flange; 223-a gasket; 224-a sealant; 225-container flange; 230-a second end enclosure; 240-a flow guide part; 241-a guide ring body; 250-a support portion; 251-a support flange; 252 — a first support plate; 260-a covering part; 261-closing a flange; 262-a second support plate; 270-separation net; 300-cartridge filter; 310-a filter tank; 311-a mounting plate; 312-canister vent; 313-liquid inlet of filtering tank; 314-a filter tank liquid outlet; 315-filtering tank drain outlet; 320-a filter element; 321-a cartridge body; 322-a perforated center tube; 323-central tube gas inlet; 324-central tube outlet; 330-a flow splitting section; 331-central shaft; 332-splitter plates; 333-connecting part; 400-sand-water separator; 410-filter material collector; 500-liquid outlet main pipe; 510-a main sewer; 520-backwash water main; 521-a backwashing pump; 530-back flushing gas main pipe; 511-a first forward sewage drain; 512-first reverse sewage draining pipe; 513 — a first exhaust pipe; 514-a first drain pipe; 515-a first liquid inlet pipe; 516-a first intake pipe; 522-a second liquid inlet pipe; 523-second drain pipe; 524-first shunt control valve; 525-a second air inlet pipe; 526-a second sewage draining pipe; 531-third liquid inlet pipe; 532-third drain pipe; 533-third blow off pipe; 534-second shunt control valve; 535-third intake pipe; 536-a fourth liquid inlet pipe; 600-liquid inlet master control valve; 610-pump inlet hydraulic control valve; 620-pump inlet air control valve; 630-exhaust valve; 640-an air intake master control valve; 650-liquid outlet master control valve; 660-backwash drain valve.

Detailed Description

The technical solution of the present invention will be described in detail and fully with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the present embodiment provides a modular filtration system comprising a feed manifold 100 and at least one filtration device in communication with the feed manifold 100; the filtering device comprises a primary filter 200, a security filter 300 and a sand-water separator 400 which are sequentially arranged along the flowing direction of liquid, wherein the primary filter 200 is communicated with the liquid inlet main pipe 100, porous filtering particles are arranged in the primary filter 200, the primary filter 200 and the security filter 300 are both communicated with the liquid outlet main pipe 500, and the security filter 300 can filter the liquid filtered by the primary filter 200 again and collect the liquid into the liquid outlet main pipe 500; both the primary filter 200 and the sand-water separator 400 are in communication with the blowdown manifold 510, and the sand-water separator 400 is configured to filter out filtered particles entering the blowdown manifold 510 when the primary filter 200 is back flushed.

Specifically, the liquid inlet manifold 100 is provided with a liquid inlet branch pipe 110, an online monitor and an online turbidity meter are sequentially arranged on the liquid inlet manifold 100 along the flowing direction of the liquid, and the online monitor can be set as a flowmeter or a water quality COD monitor; one end of the liquid inlet branch pipe 110 is communicated with the liquid inlet main pipe 100, the other end of the liquid inlet branch pipe 110 is communicated with the filtering device, and a liquid inlet main control valve 600 for adjusting the flow rate and controlling the on-off of a liquid path are sequentially connected in series on the liquid inlet branch pipe 110 along the flowing direction of liquid; when filter equipment sets up to a plurality of, a plurality of filter equipment communicate with feed liquor house steward 100 through a plurality of feed liquor branch pipes 110 respectively, can be provided with the ooff valve on feed liquor house steward 100 and be located between arbitrary two adjacent feed liquor branch pipes 110 for a plurality of filter equipment can filter the liquid in the feed liquor house steward 100 with the mode of parallelly connected or establishing ties.

One end of the liquid inlet branch pipe 110, which is far away from the liquid inlet main pipe 100, is communicated with the primary filter 200, a filtering layer formed by porous filtering particles is arranged in the filtering device, liquid in the liquid inlet branch pipe 110 enters the primary filter 200, is filtered by the filtering layer and then is discharged into the liquid outlet main pipe 500, the tail end of the liquid outlet main pipe 500 is provided with a liquid outlet main control valve 650, and the liquid outlet main control valve 650 is used for adjusting the pressure of the liquid discharged from the liquid outlet main pipe 500; the liquid filtered by the filtering layer in the liquid outlet pipe enters the cartridge filter 300 again for filtering, and is discharged into the liquid storage main pipe after being filtered, at the moment, the cartridge filter 300 is equivalently connected in series on the liquid outlet main pipe 500, and the liquid filtered by the cartridge filter 300 is clean water meeting the requirements; the primary filter 200 is communicated with the sand-water separator 400 through the blowdown header pipe 510, and when the primary filter 200 is backwashed, sewage in the primary filter 200 enters the blowdown header pipe 510, and the sand-water separator 400 intercepts and filters the filter particles entering the blowdown pipe, so that the filter particles are collected.

In the combined filtering system provided by the embodiment, since at least one filtering device filters the liquid in the inlet manifold 100, the filtering device comprises a primary filter 200, a cartridge filter 300 and a sand-water separator 400, and by combining the primary filter 200 and the cartridge filter 300, the cartridge filter 300 re-filters the liquid filtered by the primary filter 200, and compared with the case of using the primary filter 200 alone, the filtering precision is remarkably improved; and sand-water separator 400 can carry out filtering separation to the filter granules when primary filter 200 carries out the backwash to collect and reuse the filter granules who separates, practiced thrift the operation cost.

On the basis of the above embodiments, further, the combined filtering system provided in this embodiment further includes a backwash water header pipe 520 and a backwash air header pipe 530 communicated with an air source; the primary filter 200 is respectively communicated with a sewage main pipe 510 through a first forward sewage discharge pipe 511, a first reverse sewage discharge pipe 512 and a first exhaust pipe 513, the primary filter 200 is communicated with a liquid outlet main pipe 500 through a first exhaust pipe 514, the primary filter 200 is communicated with a backwashing water main pipe 520 through a first liquid inlet pipe 515, and the primary filter 200 is communicated with a backwashing gas main pipe 530 through a first air inlet pipe 516.

Specifically, as shown in fig. 2, the backwash water main pipe 520 may be communicated with the liquid outlet main pipe 500, a backwash pump 521 is connected in series to the backwash water main pipe 520, a pump inlet hydraulic control valve 610 is disposed between the backwash water main pipe 520 and the liquid outlet main pipe 500, and the pump inlet hydraulic control valve 610 is used for controlling whether water energy in the liquid outlet main pipe 500 enters the backwash water main pipe 520; the air source comprises an air compressor and a high-pressure air tank communicated with the air compressor, one end of the backflushing air main pipe 530 and the high-pressure air pipe are arranged, an air inlet main control valve 640 for controlling the on-off of an air path is arranged on the backflushing air main pipe 530 and close to the outlet of the high-pressure air tank, an exhaust valve 630 for controlling the exhaust air is further arranged on the backflushing air main pipe 530, and the exhaust valve 630 and the air inlet main control valve 640 are selectively opened according to the use requirement; one end of the backflushing gas main pipe 530 far away from the high-pressure gas tank can be communicated with the backflushing water main pipe 520, a pump inlet pneumatic control valve 620 is arranged between the backflushing gas main pipe 530 and the backflushing water main pipe 520, and the pump inlet pneumatic control valve 620 is used for controlling whether gas in the backflushing gas main pipe 530 can enter the backflushing water main pipe 520 or not.

A backwashing sewage valve 660 with a liquid path being on-off is arranged on the first reverse sewage discharge pipe 512, control valves for controlling the liquid path or the gas path to be on-off are arranged on the first forward sewage discharge pipe 511, the first exhaust pipe 513, the first liquid discharge pipe 514, the first liquid inlet pipe 515 and the first gas inlet pipe 516, and a valve for adjusting the flow rate is also arranged on the first liquid discharge pipe 514; the primary filter 200 is configured with a forward run condition, a forward purge condition, and a reverse purge condition.

In the forward mode of operation, the associated control valves on the inlet branch pipe 110 and on the first drain pipe 514 are opened, and the control valves on the other pipes are closed, so that the liquid in the inlet manifold 100 enters the primary filter 200 through the inlet branch pipe 110 for filtration, and the filtered liquid is discharged into the outlet manifold 500 through the first drain pipe 514.

In the forward cleaning state, the related control valves on the inlet branch pipe 110 and the first forward sewage draining pipe 511 are opened, and the control valves on other pipelines are closed, so that the liquid in the inlet main 100 enters the primary filter 200 through the inlet branch pipe 110 and fills the primary filter 200, and then the water in the primary filter 200 is drained into the sewage draining main 510 through the first forward sewage draining pipe 511.

In the reverse cleaning state, step 1 is first performed: respectively opening a control valve on the first reverse sewage discharge pipe 512, a control valve on the first exhaust pipe 513, a control valve on the first liquid inlet pipe 515, a pump inlet hydraulic control valve 610 and a pump inlet pneumatic control valve 620, synchronously conveying liquid entering the backwash water main pipe 520 from the liquid outlet main pipe 500 and gas entering the backwash water main pipe 520 from the backwash gas main pipe 530 into the primary filter 200 through the first liquid inlet pipe 515 for reverse flushing by the backwash pump 521, discharging the flushed wastewater into the sewage main pipe 510 through the first reverse sewage discharge pipe 512, and discharging the gas into the sewage main pipe 510 through the first exhaust pipe 513; the impeller of the backwashing pump 521 rotating at high speed mixes the inlet air and the inlet water together, and backflushs the filter particles in the primary filter 200 under the pressure caused by the pump head of the water pump; because the first exhaust pipe 513 and the first reverse sewage discharge pipe 512 are communicated with the sewage discharge main pipe 510, the primary filter 200 is in a normal pressure state, and a large amount of bubbles are released due to the reduction of pressure after the backwashing water enters the primary filter 200, so that the sewage floats upwards. Then, step 2 is executed: the pump inlet pneumatic control valve 620 and the pump inlet pneumatic control valve 610 are closed and the backwash pump 521 is deactivated so that the liquid in the primary filter 200 is drained under gravity through the first reverse drain pipe 512 into the drain main 510. Then, step 3 is executed: by controlling the air inlet main control valve 640, the air in the backflushing air manifold 530 is intermittently led to enter the primary filter 200 through the first air inlet pipe 516, so that the filtering particles in the primary filter 200 are in a boiling state; then, step 4 is executed: and (4) closing the air inlet main control valve 640 and the valve on the first air inlet pipe 516, and repeatedly executing the step 1.

Further, the cartridge filter 300 is respectively communicated with the liquid outlet main pipe 500 through a second liquid inlet pipe 522 and a second liquid outlet pipe 523, and a first shunt control valve 524 is arranged on the liquid outlet main pipe 500 and between the second liquid inlet pipe 522 and the second liquid outlet pipe 523; the canister filter 300 is in communication with the backwash air manifold 530 through a second air inlet conduit 525 and the canister filter 300 is in communication with the blowdown manifold 510 through a second blowdown conduit 526.

Specifically, the second liquid inlet pipe 522, the second liquid outlet pipe 523, the second air inlet pipe 525 and the second sewage discharge pipe 526 are all provided with control valves for controlling the on-off of a liquid path or an air path, when the first shunting control valve 524 is opened and the control valves on the second liquid inlet pipe 522, the second liquid outlet pipe 523, the second air inlet pipe 525 and the second sewage discharge pipe 526 are all closed, the cartridge filter 300 is in an isolated state, and the cartridge filter 300 can be overhauled at the moment; in addition, the cartridge filter 300 is configured with a forward filtering state and a reverse blowdown state.

In the forward filtering state, the first shunt control valve 524 is closed, the control valves on the second sewage discharge pipe 526 and the second air inlet pipe 525 are closed, at this time, the cartridge filter 300 is connected in series with the liquid outlet main pipe 500, the liquid filtered by the primary filter 200 in the liquid outlet main pipe 500 enters the cartridge filter 300 through the second liquid inlet pipe 522 for filtering, and then is discharged into the liquid outlet main pipe 500 through the second liquid outlet pipe 523.

In a reverse sewage discharge state, the control valve on the second liquid discharge pipe 523 is closed, the control valve on the second sewage discharge pipe 526 is opened, and the control valves on the second liquid inlet pipe 522 and the second gas inlet pipe 525 are intermittently opened, so that liquid in the liquid outlet main pipe 500 intermittently enters the cartridge filter 300 through the second liquid inlet pipe 522, gas in the backwash main pipe 530 intermittently enters the cartridge filter 300 through the second gas inlet pipe 525, and the gas-liquid two-phase after the reverse flushing of the cartridge filter 300 is discharged into the sewage discharge main pipe 510 through the second sewage discharge pipe 526.

Further, the sand-water separator 400 is communicated with the main sewage drain pipe 510 through a third liquid inlet pipe 531, a third liquid outlet pipe 532 and a third sewage drain pipe 533 respectively, and the third sewage drain pipe 533 is connected in series with the filter material collector 410; a second shunt control valve 534 is arranged on the sewage main pipe 510 and between the third liquid inlet pipe 531 and the third sewage discharge pipe 533; the backwash air manifold 530 is communicated with the sand-water separator 400 through a third air inlet pipe 535, and the liquid outlet manifold 500 is communicated with the sand-water separator 400 through a fourth air inlet pipe 536.

Specifically, the third liquid inlet pipe 531, the third liquid outlet pipe 532, the third sewage discharge pipe 533, the third gas inlet pipe 535 and the fourth liquid inlet pipe 536 are all provided with control valves for controlling the on-off of a liquid path or a gas path, when the second branch control valve 534 is opened, the liquid in the sewage main pipe 510 can be discharged without the filtering action of the sand water filter, and the sand water filter can be overhauled at the moment; the sand-water separator 400 is configured with a forward sand-screening state, a reverse sand-washing state, and a sand-draining state.

In the forward sand filtering state, the second shunt control valve 534 is closed, the control valves on the third sewage discharge pipe 533, the third air inlet pipe 535 and the fourth air inlet pipe 536 are closed, the control valves on the third air inlet pipe 531 and the third liquid discharge pipe 532 are opened, at this time, the sand-water separator 400 is equivalently connected in series on the sewage main pipe 510, and the liquid in the sewage main pipe 510 enters the sand-water separator 400 through the third air inlet pipe 531 to be filtered, and then is discharged into the sewage main pipe 510 through the third liquid discharge pipe 532.

In a reverse sand washing state, the control valve on the third liquid inlet pipe 531 is closed, the control valve on the fourth liquid inlet pipe 536 is opened, and the control valve on the third gas inlet pipe 535 is intermittently opened, so that liquid in the liquid outlet main pipe 500 enters the sand-water separator 400 through the fourth liquid inlet pipe 536, and gas in the backflushing gas main pipe 530 enters the sand-water separator 400 through the third gas inlet pipe 535 to reversely clean the collected filter particles, and the cleaned waste liquid and waste gas are discharged into the blowdown main pipe 510 through the third liquid outlet pipe 532.

In the sand discharging state, the control valves of the fourth liquid inlet pipe 536 and the third gas inlet pipe 535 are closed, and the control valve of the third sewage discharge pipe 533 is opened, so that the collected filter particles enter the filter material collector 410 under the impact of the residual liquid, and simultaneously, the liquid is discharged into the sewage main 510 through the third sewage discharge pipe 533.

The combined filtering system provided by the embodiment combines the primary filter 200 and the security filter 300, so that the filtering precision of sewage is greatly improved, and the sand-water separator 400 can collect the filter material discharged when the primary filter 200 is backwashed, so that the combined filtering system has good sustainable usability. Primary filter 200, cartridge filter 300 and sand water separator 400 all can carry out the backwash blowdown, can avoid the three to take place to block up, use more high-efficiently.

On the basis of the above embodiments, further, the primary filter 200 in the combined filtering system provided by the present embodiment includes a container body 210, a first head 220 and a second head 230; the first sealing head 220 is connected with the bottom of the container body 210 in a sealing manner, the second sealing head 230 is connected with the top of the container body 210 in a sealing manner, the first sealing head 220 is provided with a first water outlet 211, the second sealing head 230 is provided with a second water outlet 212, and the side wall of the container body 210 is provided with a water inlet 213. The container body 210 is made of PVC.

Specifically, as shown in fig. 3, the container body 210 is a pipe made of PVC, the container body 210 made of PVC has significantly improved corrosion resistance compared to a common carbon steel pipe, and the first sealing head 220 and the second sealing head 230 are made of metal; the container body 210, the first sealing head 220 and the second sealing head 230 are combined to form the primary filter 200 in the embodiment, the first water outlet 211 is respectively communicated with the first forward sewage discharge pipe 511, the first air inlet pipe 516, the first drain pipe 514 and the first liquid inlet pipe 515, the second water outlet 212 is communicated with the first drain pipe 513, the second water outlet 212 is used for draining liquid or exhausting gas, and the water inlet 213 is respectively communicated with the liquid inlet branch pipe 110 and the first reverse sewage discharge pipe 512.

Further, a flow guide portion 240 is disposed on an inner wall of the container body 210, and the flow guide portion 240 is used for guiding the liquid flowing along the inner wall of the container body 210 to the filter particles.

Specifically, the diversion part 240 may be configured as a diversion ring and a backflow block, and the diversion part 240 is configured to prevent the liquid from directly flowing from the water inlet 213 to the first water outlet 211 along the inner wall of the container body 210 without being filtered by the filter layer formed by the filter particles.

Further, the flow guide part 240 includes a plurality of flow guide ring bodies 241 sequentially arranged along the length direction of the container body 210, and the plurality of flow guide ring bodies 241 are hermetically connected with the inner wall of the container body 210; the top surface of the guide ring body 241 is perpendicular to the inner wall of the container body 210, and the bottom surface of the guide ring body 241 is configured as an arc surface with a diameter decreasing from bottom to top.

Specifically, as shown in fig. 3 and 4, the plurality of guide ring bodies 241 are uniformly arranged at intervals along the length direction of the container body 210, the guide ring bodies 241 are attached to the inner wall of the container body 210 and are bonded to the inner wall of the container body 210 through the sealant 224, a through hole is formed in the container body 210, a connecting member, such as a screw, can pass through the through hole to be connected with the guide ring bodies 241, so as to improve the fixing effect on the guide ring bodies 241, and the through hole is filled with the sealant 224, so as to ensure the sealing performance of the container body 210. The top surface of the guide ring body 241 is vertical to the inner wall of the container body 210, and liquid entering the container body 210 through the water inlet 213 flows towards the direction close to the central axis of the filter layer under the action of the top surface of the guide ring body 241; the bottom surface of the deflector ring 241 is preferably configured as a tapered surface with a decreasing diameter from bottom to top to facilitate upward movement of the filter particles during backwashing of the primary filter 200.

Further, the first sealing head 220 includes a sealing head body 221 and a sealing head flange 222 fixedly connected to the sealing head body 221; the seal head flange 222 is provided with a containing groove, a sealing gasket 223 is arranged in the containing groove, the bottom end of the container body 210 extends into the containing groove and is supported on the sealing gasket 223, and the containing groove is filled with a sealing adhesive 224.

Specifically, as shown in fig. 5, the accommodating groove is provided as an annular groove, the sealing gasket 223 is provided as an annular rubber sealing gasket 223, the end surface of the bottom end of the container body 210 is in contact with the sealing gasket 223 for sealing, and the sealing gasket 224 filled in the accommodating groove ensures the sealing between the container body 210 and the sealing flange 222; the traditional sealing mode that the flange is clamped to the flange, the plane is clamped to the plane and the middle of the flange is clamped with the rubber pad is changed, the special designed annular groove sealing mode is adopted, and the multi-sealing effect is achieved.

Further, a container flange 225 is disposed on an outer wall of the container body 210, and the container flange 225 is connected to the sealing flange 222 through a connecting member.

Specifically, as shown in fig. 7, the container flange 225 is sleeved outside the container body 210 and is fixedly connected to the outer wall of the container body 210, the end socket flange 222 can be welded to the end socket, the connecting member includes a connecting bolt, and the container flange 225 and the end socket flange 222 are fixedly connected into a whole through the connecting bolt, so that the connection reliability between the first end socket 220 and the container body 210 is improved. The connection structure between the container body 210 and the second sealing head 230 is the same as the connection structure between the container body 210 and the first sealing head 220, and the detailed description thereof is omitted.

Further, a supporting portion 250 is fixedly connected in the first sealing head 220, a covering portion 260 is detachably connected to the supporting portion 250, a separation net 270 is clamped between the supporting portion 250 and the covering portion 260, and the filter particles are supported on the separation net 270.

Specifically, the supporting portion 250 may be a supporting body having a porous supporting plate or a flange structure, the structure of the covering portion 260 may be the same as that of the supporting portion 250, the covering portion 260 may be connected to the supporting portion 250 through bolts, the separating net 270 is a metal mesh sheet having a suitable pore size as required, the separating net 270 is clamped between the supporting portion 250 and the covering portion 260, and the separating net 270 is used to support filter particles in the primary filter 200.

Further, the supporting portion 250 includes a supporting flange 251 and a plurality of first supporting plates 252 connected to the supporting flange 251, the supporting flange 251 is fixedly connected to the inner wall of the first sealing head 220; the covering part 260 comprises a covering flange 261 and a plurality of second supporting plates 262 connected with the covering flange 261, the covering flange 261 is detachably connected with the supporting flange 251, and the partition net 270 is clamped between the first supporting plate 252 and the second supporting plates 262.

Specifically, as shown in fig. 5 and 6, the supporting flange 251 is welded on the inner wall of the first end socket 220, both the first supporting plate 252 and the second supporting plate 262 can be made of stainless steel flat steel, the first supporting plate 252 is welded on the supporting flange 251, the second supporting plate 262 is welded on the covering flange 261, and the covering flange 261 is fixed on the supporting flange 251 through bolts; through setting up first backup pad 252 and second backup pad 262, increased the support area to separating net 270, improved on the one hand and separated net 270 forward to the support capacity of filter particle, another convenient deformation under the effect of hydraulic force of separating net 270 when having reduced the back flush.

In the combined filtering system provided by the embodiment, the flow guide part 240 arranged on the inner wall of the container body 210 prevents the liquid which is not filtered by the filtering layer from directly flowing out along the inner wall of the container body 210, so that the filtering capacity of the liquid is improved; the upper end and the lower end of the container body 210 respectively extend into the accommodating groove to be hermetically connected with the second seal head 230 and the first seal head 220, and the accommodating groove is filled with the sealant 224, so that the sealing structure of the traditional flange clamping rubber gasket is changed, and the sealing effect is better.

Based on the above embodiments, further, the cartridge filter 300 in the combined filtering system provided by the present embodiment includes a filter tank 310 and at least one filter element 320; the filter tank body 310 is internally provided with an installation plate 311, the installation plate 311 divides the filter tank body 310 into a liquid inlet cavity and a liquid outlet cavity, the top of the filter tank body 310 is provided with a filter tank air outlet 312 communicated with the liquid inlet cavity, the side part of the filter tank body 310 is provided with a filter tank liquid inlet 313 and a filter tank sewage outlet 315 communicated with the liquid inlet cavity, and the bottom of the filter tank body 310 is provided with a filter tank liquid outlet 314 communicated with the liquid outlet cavity; the filter element 320 is arranged on the mounting plate 311, and the liquid in the liquid inlet chamber enters the liquid outlet chamber after being filtered by the filter element 320.

Specifically, as shown in fig. 8, two or more filter elements 320 may be provided, and when a plurality of filter elements 320 are provided, the plurality of filter elements 320 are all mounted on the mounting plate 311; the filter tank sewage draining outlet 315 is communicated with a second sewage draining pipe 526, the filter tank liquid inlet 313 is communicated with a second liquid inlet pipe 522, the filter tank liquid outlet 314 is communicated with a second liquid outlet pipe 523, and the filter tank air outlet 312 can be communicated with the second sewage draining pipe 526 through a pipeline.

Further, the filter element 320 comprises a filter element body 321, a porous central tube 322 and a flow dividing part 330 arranged in the porous central tube 322; the filter element body 321 is sleeved outside the porous central tube 322, liquid in the liquid inlet chamber enters the porous central tube 322 after being filtered by the filter element body 321, a central tube air inlet 323 is arranged at the bottom end of the porous central tube 322, and a central tube water outlet 324 is arranged on the side wall of the porous central tube 322; the flow dividing portion 330 serves to disperse the gas entering into the perforated center pipe 322 through the center pipe gas inlet 323, so that the gas is diffused in the radial direction of the cartridge body 321.

Specifically, as shown in fig. 9, the filter element body 321 includes an inner support body, an outer support body, and a metal filter screen sandwiched between the inner support body and the outer support body, the inner support body and the outer support body may be configured as a mesh-sheet type framework structure, and the aperture of the metal filter screen is preferably smaller than 0.1 μm; the side wall of the porous central tube 322 is provided with a plurality of micropores, liquid in the liquid inlet chamber is filtered by the filter element body 321, then flows into the porous central tube 322 through the micropores and flows into the liquid outlet chamber through the central tube water outlet 324, and the central tube air inlet 323 is communicated with the second air inlet tube 525. The separating portion may be configured as a splitter plate or a barrier structure, so that more air entering the porous central tube 322 through the central tube air inlet 323 blows towards a direction perpendicular to the inner wall of the filter element body 321, so as to blow off hair, fibrous stains, and the like trapped by the filter element body 321.

Further, the flow dividing part 330 includes a central shaft 331 and a plurality of flow dividing plates 332 sequentially disposed along the central shaft 331; the central shaft rod 331 is arranged in the porous central tube 322, and the top end of the central shaft rod 331 is connected with the top of the filter element body 321 through a connecting part 333; the dividing plate 332 is detachably connected with the central shaft 331 so as to adjust the distance between any two adjacent dividing plates 332, a dividing chamber is enclosed between any two adjacent dividing plates 332 and the filter element body 321, and gas sequentially enters the plurality of dividing chambers through the central shaft gas inlet 323.

Specifically, central axostylus axostyle 331 sets up to full thread lead screw, and a plurality of splitter plates 332 all overlap on central axostylus axostyle 331, and the upper and lower both sides of every splitter plate 332 respectively are provided with a fastening nut, are convenient for adjust the size of the reposition of redundant personnel cavity between two adjacent splitter plates 332 on the one hand, and on the other hand conveniently fixes splitter plates 332 on central axostylus axostyle 331. As shown in fig. 10, a part of the gas entering the perforated center pipe 322 through the center pipe gas inlet 323 moves in the radial direction of the filter element body 321 after impinging on the dividing plate 332, and another part of the gas enters the adjacent dividing chambers through the gap between the dividing plate 332 and the perforated center pipe 322, and the moving state of the gas in the adjacent dividing chambers is the same as the above-mentioned moving state; with this arrangement, dirt trapped by the filter element body 321 can be strongly peeled off.

Furthermore, the particle size of the filter particles is set to be 0.5-1.6mm, the porosity is set to be 73-85%, and the thickness of a filter layer formed by the filter particles is not less than 1.5 m.

Wherein the filter particles comprise volcanic rock and/or sintered microporous particles.

Specifically, the filter layer can be independently formed by volcanic rock, or independently formed by sintered microporous particles, or formed by the combination of volcanic rock and sintered microporous particles; preferably, the thickness of the filter layer is set to be 3 meters; in addition, the specific gravity of the filtering particles is set to be 1.1-1.5g/cm3, the compressive strength is set to be 6Mpa, the shear strength is set to be 4Mma, the surface area is set to be 13-25 square meters per gram, and the particle size range is set to be 0.3-5 mm, and by controlling the parameters of the filtering particles, the filtering precision of the security filter 300 provided by the embodiment can reach 0.1 micron.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (17)

1. A modular filtration system, comprising: a liquid inlet main pipe (100) and at least one filtering device communicated with the liquid inlet main pipe (100);

the filtering device comprises a primary filter (200), a security filter (300) and a sand-water separator (400) which are sequentially arranged along the liquid flowing direction, wherein the primary filter (200) is communicated with the liquid inlet main pipe (100), porous filtering particles are arranged in the primary filter (200), the primary filter (200) and the security filter (300) are both communicated with a liquid outlet main pipe (500), and the security filter (300) can re-filter the liquid filtered by the primary filter (200) and collect the liquid into the liquid outlet main pipe (500);

the primary filter (200) and the sand-water separator (400) are both in communication with a blowdown header (510), the sand-water separator (400) being configured to filter out filtered particles entering the blowdown header (510) upon back flushing of the primary filter (200).

2. The combined filtration system of claim 1, further comprising a backwash water manifold (520) and a backwash gas manifold (530) in communication with a gas source;

the primary filter (200) is communicated with the sewage header pipe (510) through a first forward sewage pipe (511), a first reverse sewage pipe (512) and a first exhaust pipe (513) respectively, the primary filter (200) is communicated with the liquid outlet header pipe (500) through a first liquid exhaust pipe (514), the primary filter (200) is communicated with the backwashing water header pipe (520) through a first liquid inlet pipe (515), and the primary filter (200) is communicated with the backwashing gas header pipe (530) through a first air inlet pipe (516).

3. The combined filtration system of claim 2, wherein the cartridge filter (300) is in communication with the outlet manifold (500) via a second inlet pipe (522) and a second outlet pipe (523), respectively, and a first bypass control valve (524) is disposed on the outlet manifold (500) between the second inlet pipe (522) and the second outlet pipe (523);

the cartridge filter (300) is communicated with the backflushing air main pipe (530) through a second air inlet pipe (525), and the cartridge filter (300) is communicated with the blowdown main pipe (510) through a second blowdown pipe (526).

4. The combined filtering system of claim 2, wherein the sand-water separator (400) is communicated with the blowdown header pipe (510) through a third liquid inlet pipe (531), a third liquid outlet pipe (532) and a third blowdown pipe (533), respectively, and a filter material collector (410) is connected in series to the third blowdown pipe (533); a second branch control valve (534) is arranged on the sewage main pipe (510) and between the third liquid inlet pipe (531) and the third sewage discharge pipe (533);

the backflushing gas main pipe (530) is communicated with the sand-water separator (400) through a third gas inlet pipe (535), and the liquid outlet main pipe (500) is communicated with the sand-water separator (400) through a fourth liquid inlet pipe (536).

5. The combined filtration system of claim 1, wherein the primary filter (200) comprises a container body (210), a first head (220), and a second head (230);

the container is characterized in that the first sealing head (220) is connected with the bottom of the container body (210) in a sealing mode, the second sealing head (230) is connected with the top of the container body (210) in a sealing mode, a first water outlet (211) is formed in the first sealing head (220), a second water outlet (212) is formed in the second sealing head (230), and a water inlet (213) is formed in the side wall of the container body (210).

6. The combined filter system according to claim 5, wherein a flow guide (240) is provided on an inner wall of the container body (210), the flow guide (240) being configured to guide the liquid flowing along the inner wall of the container body (210) to the filter particles.

7. The combined filter system of claim 6, wherein the guide portion (240) comprises a plurality of guide rings (241) sequentially arranged along the length direction of the container body (210), and the plurality of guide rings (241) are hermetically connected with the inner wall of the container body (210);

the top surface of the flow guide ring body (241) is perpendicular to the inner wall of the container body (210), and the bottom surface of the flow guide ring body (241) is provided with an arc surface with a diameter decreasing from bottom to top.

8. The modular filtration system of claim 5, wherein the first header (220) comprises a header body (221) and a header flange (222) fixedly attached to the header body (221);

be provided with the storage tank on head flange (222), be provided with sealed pad (223) in the storage tank, the bottom of vessel body (210) stretches into in the storage tank and support in sealed pad (223) is last, the storage tank intussuseption is filled with sealed glue (224).

9. The modular filtration system of claim 8, wherein a vessel flange (225) is provided on an outer wall of the vessel body (210), the vessel flange (225) being connected to the head flange (222) by a connector.

10. The combined filtering system according to claim 5, wherein a supporting portion (250) is fixedly connected in the first sealing head (220), a covering portion (260) is detachably connected to the supporting portion (250), a separation net (270) is clamped between the supporting portion (250) and the covering portion (260), and the filter particles are supported on the separation net (270).

11. The modular filtration system of claim 10, wherein the support (250) comprises a support flange (251) and a plurality of first support plates (252) connected to the support flange (251), the support flange (251) being fixedly connected to an inner wall of the first head (220);

the covering part (260) comprises a covering flange (261) and a plurality of second supporting plates (262) connected with the covering flange (261), the covering flange (261) is detachably connected with the supporting flange (251), and the separation net (270) is clamped between the first supporting plate (252) and the second supporting plates (262).

12. The combined filtration system of claim 1, wherein the cartridge filter (300) comprises a filter canister (310) and at least one filter cartridge (320);

the filter tank is characterized in that a mounting plate (311) is arranged in the filter tank body (310), the filter tank body (310) is divided into a liquid inlet cavity and a liquid outlet cavity by the mounting plate (311), a filter tank exhaust port (312) communicated with the liquid inlet cavity is formed in the top of the filter tank body (310), a filter tank liquid inlet (313) and a filter tank sewage outlet (315) communicated with the liquid inlet cavity are formed in the side portion of the filter tank body (310), and a filter tank liquid outlet (314) communicated with the liquid outlet cavity is formed in the bottom of the filter tank body (310);

the filter element (320) is arranged on the mounting plate (311), and liquid in the liquid inlet chamber enters the liquid outlet chamber after being filtered by the filter element (320).

13. The combined filtration system of claim 12, wherein the filter cartridge (320) comprises a cartridge body (321), a perforated center tube (322), and a diverter (330) disposed within the perforated center tube (322);

the filter element body (321) is sleeved outside the porous central tube (322), liquid in the liquid inlet cavity enters the porous central tube (322) after being filtered by the filter element body (321), a central tube air inlet (323) is formed in the bottom end of the porous central tube (322), and a central tube water outlet (324) is formed in the side wall of the porous central tube (322);

the flow dividing part (330) is used for dispersing gas entering the porous central pipe (322) through the central pipe gas inlet (323) so that the gas is diffused along the radial direction of the filter element body (321).

14. The combined filtration system of claim 13, wherein the diverter portion (330) includes a central shaft (331) and a plurality of diverter blades (332) disposed sequentially along the central shaft (331);

the central shaft rod (331) is arranged in the porous central pipe (322), and the top end of the central shaft rod (331) is connected with the top of the filter element body (321) through a connecting part (333);

the flow dividing plates (332) are detachably connected with the central shaft rod (331) so that the distance between any two adjacent flow dividing plates (332) can be adjusted, flow dividing chambers are defined between any two adjacent flow dividing plates (332) and the filter element body (321), and gas sequentially enters the flow dividing chambers through the central shaft gas inlet (323).

15. The modular filtration system of claim 1, wherein the filter particles are sized to be 0.5-1.6mm in diameter and 73-85% in porosity, and wherein the filter particles form a filter layer having a thickness of no less than 1.5 meters.

16. The combined filter system of claim 15, wherein the filter particles comprise volcanic rock and/or sintered microporous particles.

17. The modular filtration system of claim 7, wherein the container body (210) is made of PVC.

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