CN110772844A - Combined filter system - Google Patents

Abstract

The invention provides a combined filtration system, which relates to the technical field of water treatment, comprising a liquid inlet main pipe and at least one filter device communicating with the liquid inlet main pipe; filter and sand-water separator; since at least one filter device filters the liquid in the liquid inlet main pipe, the filter device includes a primary filter, a security filter and a sand-water separator, through the combination of the primary filter and the security filter, the security The filter re-filters the liquid filtered by the primary filter. Compared with using the primary filter alone, the filtration accuracy is significantly improved; and the sand-water separator can filter and separate the filter particles when the primary filter is backwashed. In order to collect and reuse the separated filter particles, it saves operating costs.

Description

Combined filter system

technical field

The invention relates to the technical field of water treatment, in particular to a combined filtering system.

Background technique

With the shortage of water resources, the treatment and reuse of water resources has become a necessary means. The most commonly used water treatment method is to filter through a filter device.

The more commonly used filtration devices are sand canister filters and ultrafiltration membrane filters; among them, the quartz sand particles filled in the sand canister filter have large gaps and low filtration accuracy, which cannot meet the requirements; ultrafiltration membrane filtration The filtration precision of the filter is very high, but the cost of replacing the filter membrane is high, and the filter membrane has higher requirements on the ambient temperature.

With the advancement of filtration technology, a filter of porous particulate material has appeared, and its filtration accuracy is between the sand canister filter and the ultrafiltration membrane filter; however, the filter relying solely on porous particulate material also It cannot meet the requirements of sewage treatment, and the reverse cleaning of the filter of porous particulate material is likely to lead to the loss of filter particles, which has a great impact on operating costs.

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 already known to a person skilled in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a combined filtration system to alleviate the technical problem that the filter relying solely on the porous particle structure has limited sewage treatment capacity, and the filter particles are easily lost during reverse cleaning.

In order to solve the above-mentioned technical problems, the technical scheme provided by the present invention is:

The combined filtration system provided by the present invention comprises a liquid inlet manifold and at least one filtering device communicated with the liquid inlet manifold;

The filtering device includes a primary filter, a security filter and a sand-water separator which are arranged in sequence along the liquid flow direction, the primary filter is communicated with the liquid inlet main pipe, and porous filter particles are arranged in the primary filter, Both the primary filter and the security filter are communicated with the liquid outlet main pipe, and the security filter can filter the liquid filtered by the primary filter again and flow into the liquid outlet main pipe;

Both the primary filter and the sand-water separator are in communication with the sewage main pipe, and the sand-water separator is configured to filter and separate the filter particles entering the sewage main pipe when the primary filter is backwashed .

Further, it also includes a backwash water main pipe and a backflush gas main pipe communicated with the gas source;

The primary filter is communicated with the sewage main pipe through the first forward sewage pipe, the first reverse sewage pipe and the first exhaust pipe respectively, and the primary filter is connected with the liquid outlet main pipe through the first liquid discharge pipe The primary filter communicates with the backwash water main pipe through a first liquid inlet pipe, and the primary filter communicates with the backwash gas main 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, the liquid in the liquid inlet main pipe enters the primary filter for filtration, and then is discharged into the liquid outlet main pipe through the first liquid discharge pipe;

In the forward cleaning state, the liquid in the liquid inlet main pipe enters the primary filter for forward flushing, and then is discharged into the sewage main pipe through the first forward sewage pipe;

In the reverse cleaning state, the backwash pump provided on the backwash water main pipe pumps the liquid in the backwash water main pipe into the primary filter through the first liquid inlet pipe for reverse direction Flush, and then discharge into the sewage main pipe through the first reverse sewage pipe; the gas in the backflushing gas main pipe enters the primary filter through the first intake pipe for reverse flushing, and the flushed exhaust gas It is discharged into the sewage main pipe through the first exhaust pipe.

Further, the security filter is communicated with the liquid outlet main pipe through the second liquid inlet pipe and the second liquid discharge pipe respectively, and is located on the liquid outlet main pipe and located in the second liquid inlet pipe and the second liquid outlet pipe. A first branch control valve is arranged between the discharge pipes;

The security filter communicates with the backflushing gas main pipe through the second air inlet pipe, and the security filter communicates with the sewage main pipe through the second sewage discharge pipe.

Further, the security filter is configured with a forward filtering state and a reverse sewage discharge state;

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

In the reverse blowdown state, the gas in the backflushing gas main pipe enters the security filter through the second air inlet pipe, and the liquid in the liquid outlet main pipe enters through the second liquid inlet pipe to the security filter, and then discharged into the sewage main pipe through the second sewage pipe.

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

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

Further, the sand-water separator is configured with a forward sand filter state, a reverse sand flush state and a sand discharge state;

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

In the reverse sand flushing state, the gas in the backflushing gas main pipe enters the sand-water separator through the third air inlet pipe, and the liquid in the liquid outlet main pipe passes through the third inlet pipe. The liquid pipe enters into the sand-water separator, and then the gas-liquid two-phase is discharged into the sewage main pipe through the third liquid discharge pipe;

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

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

The first sealing head is sealingly connected to the bottom of the container body, the second sealing head is sealingly connected to the top of the container body, the first sealing head is provided with a first water outlet, and the second sealing head is provided with a first water outlet. A second water outlet is arranged on the head, and a water inlet is arranged on the side wall of the container body.

Further, the inner wall of the container body is provided with a flow guide portion, and the flow guide portion is used for guiding the liquid flowing along the inner wall of the container body to the filter particles.

Further, the guide portion includes a plurality of guide rings arranged in sequence along the length direction of the container body, and the plurality of guide rings are all sealingly connected to the inner wall of the container body;

The top surface of the guide ring body is perpendicular to the inner wall of the container body, and the bottom surface of the guide ring body is set as an arc surface with a reduced diameter from bottom to top.

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

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

Further, a container flange is provided on the outer wall of the container body, and the container flange is connected with the head flange through a connecting piece.

Further, a support part is fixedly connected to the first head, a cover part is detachably connected to the support part, and a partition net is sandwiched between the support part and the cover part, and the filter Particles are supported on the spacer.

Further, the support portion includes a support flange and a plurality of first support plates connected with the support flange, and the support flange is fixedly connected to the inner wall of the first head;

The cover joint includes a cover flange and a plurality of second support plates connected with the cover flange, the cover flange and the support flange are detachably connected, and the partition net is sandwiched between the first and second support plates. between a support plate and the second support plate.

Further, the security filter includes a filter tank and at least one filter element;

The filter tank body is provided with a mounting plate, which divides the filter tank body into a liquid inlet chamber and a liquid outlet chamber, and the top of the filter tank body is provided with a liquid inlet chamber. The filter tank is connected to the filter tank exhaust port, the side part of the filter tank body is provided with a filter tank liquid inlet and a filter tank sewage outlet that communicate with the liquid inlet chamber, and the bottom of the filter tank body is provided with a liquid outlet of the filter tank communicated with the liquid outlet chamber;

The filter element is mounted on the mounting plate, and the liquid in the liquid inlet chamber enters the liquid outlet chamber after being filtered by the filter element.

Further, the filter element includes a filter element body, a porous central pipe and a shunt portion disposed in the porous central pipe;

The filter element body is sleeved outside the porous center pipe, the liquid in the liquid inlet chamber is filtered by the filter element body and then enters the porous center pipe, and the bottom end of the porous center pipe is provided with a center pipe inlet. an air outlet, the side wall of the porous central tube is provided with a central tube water outlet;

The splitting part is used for dispersing the gas entering the porous central pipe through the central pipe air inlet, so that the gas is diffused along the radial direction of the filter element body.

Further, the shunt part includes a central shaft and a plurality of shunts arranged in sequence along the central shaft;

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

The splitting sheet is detachably connected to the central shaft, so as to be able to adjust the distance between any two adjacent splitting sheets, and the space between any two adjacent splitting sheets and the filter element body is formed. In the shunt chamber, the gas enters the plurality of shunt chambers in sequence through the central pipe air inlet.

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

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

Further, the container body is made of PVC material.

In combination with the above technical solutions, the beneficial effects achieved by the present invention are:

The combined filtering system provided by the present invention comprises a liquid inlet main pipe and at least one filtering device communicated with the liquid inlet main pipe; The main pipe is communicated with the primary filter. Porous filter particles are arranged in the primary filter. Both the primary filter and the security filter are communicated with the liquid outlet header. The security filter can filter the liquid filtered by the primary filter again and flow into the liquid Main pipe; both the primary filter and the sand-water separator are communicated with the sewage main pipe, and the sand-water separator is configured to filter and separate the filter particles entering the sewage main pipe when the primary filter is backwashed.

Since at least one filter device filters the liquid in the liquid inlet main pipe, the filter device includes a primary filter, a security filter and a sand-water separator. The filtered liquid is filtered again, which significantly improves the filtration accuracy compared with the use of the primary filter alone; and the sand water separator can filter and separate the filter particles when the primary filter is backwashed, so as to facilitate the filtration of the separated Particles are collected and reused, saving operating costs.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

1 is a schematic structural diagram of a combined filtering system provided by an embodiment of the present invention;

2 is a schematic structural diagram of a combined filtering system provided by an embodiment of the present invention;

3 is a schematic structural diagram of a primary filter in a combined filtration system provided by an embodiment of the present invention;

Fig. 4 is the structure enlarged schematic diagram of A in Fig. 3;

5 is a schematic structural diagram of the connection between the container body and the first head in the primary filter provided by the embodiment of the present invention;

6 is a cross-sectional view of FIG. 5 along the K-K direction;

7 is a schematic structural diagram of the connection between the head flange and the container flange in the primary filter provided by the embodiment of the present invention;

8 is a schematic structural diagram of a security filter in a combined filtering system provided by an embodiment of the present invention;

9 is a schematic structural diagram of a filter element in a security filter provided by an embodiment of the present invention;

FIG. 10 is a schematic diagram of gas movement when the security filter provided by the embodiment of the present invention is in a reverse blowdown state.

Icon: 100-liquid inlet main pipe; 110-liquid inlet branch pipe; 200-primary filter; 210-container body; 211-first water outlet; 212-second water outlet; 213-water inlet; 220-first head ; 221-head body; 222-head flange; 223-gasket; 224-sealant; 225-container flange; 230-second head; 240- guide part; 241- guide ring body; 250-Support part; 251-Support flange; 252-First support plate; 260-Cover part; 261-Cover flange; 262-Second support plate; Filter tank body; 311-installation plate; 312-filter tank exhaust port; 313-filter tank liquid inlet; 314-filter tank liquid outlet; 315-filter tank drain port; 320-filter element; 321-filter element body ; 322-porous central pipe; 323-central pipe air inlet; 324-central pipe water outlet; 330-split; 331-central shaft; 332-split; 333-connection; 400-sand water separator; 410-filter material collector; 500-liquid outlet main pipe; 510- sewage main pipe; 520-backwash water main pipe; 521-backwash pump; 530-backflushing gas main pipe; 511-first forward sewage pipe; 512-first A reverse sewage pipe; 513-first exhaust pipe; 514-first liquid discharge pipe; 515-first liquid inlet pipe; 516-first intake pipe; 522-second liquid inlet pipe; 523-second row Liquid pipe; 524-first branch control valve; 525-second intake pipe; 526-second sewage pipe; 531-third liquid inlet pipe; 532-third liquid discharge pipe; 533-third sewage pipe; 534 -Second branch control valve; 535-Third air inlet pipe; 536-Fourth liquid inlet pipe; 600-Inlet general control valve; 610-Inlet pump hydraulic control valve; Air valve; 640- intake master control valve; 650- liquid master control valve; 660- backwash blowdown valve.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that when the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear. ”, etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation , constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and "third," as they appear, are for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a A detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As shown in FIG. 1 , this embodiment provides a combined filtration system, including a liquid inlet manifold 100 and at least one filter device communicating with the liquid inlet manifold 100; the filter device includes primary filters 200 arranged in sequence along the liquid flow direction , security filter 300 and sand water separator 400, the primary filter 200 is communicated with the liquid inlet main pipe 100, the primary filter 200 is provided with porous filter particles, the primary filter 200 and the security filter 300 are both communicated with the liquid outlet main pipe 500 , the security filter 300 can filter the liquid filtered by the primary filter 200 again and flow into the liquid outlet main pipe 500; the primary filter 200 and the sand water separator 400 are both connected to the sewage main pipe 510, and the sand water separator 400 is configured as When the primary filter 200 is backwashed, the filter particles entering the sewage main pipe 510 are filtered and separated.

Specifically, the liquid inlet main pipe 100 is provided with a liquid inlet branch pipe 110, and an online monitoring instrument and an online turbidity meter are sequentially arranged on the liquid inlet main pipe 100 along the direction of liquid flow. The online monitoring instrument can be set as a flow meter or water quality COD Monitor; one end of the liquid inlet branch pipe 110 is communicated with the liquid inlet main pipe 100, and the other end of the liquid inlet branch pipe 110 is communicated with the filtering device. The liquid inlet master control valve 600 used to control the on-off of the liquid circuit; when there are multiple filter devices, the multiple filter devices are respectively communicated with the liquid inlet manifold 100 through a plurality of liquid inlet branch pipes 110, which are on the liquid inlet manifold 100 and located at the An on-off valve can be provided between any two adjacent liquid inlet branch pipes 110 , so that a plurality of filtering devices can filter the liquid in the liquid inlet main pipe 100 in parallel or in series.

One end of the liquid inlet branch pipe 110 away from the liquid inlet main pipe 100 is communicated with the primary filter 200. The filter device is provided with a filter layer formed by porous filter particles. The liquid in the liquid inlet branch pipe 110 enters the primary filter 200 and is filtered by the filter layer and then discharged. The liquid inlet and outlet manifold 500 is provided with a liquid outlet master control valve 650 at the end of the liquid outlet manifold 500. The liquid outlet master control valve 650 is used to adjust the pressure of the liquid discharged from the liquid outlet manifold 500; the liquid in the liquid outlet pipe is filtered by the filter layer Enter the security filter 300 again for filtration, and then discharge into the liquid storage main pipe after filtering. At this time, the security filter 300 is equivalent to being connected in series on the liquid outlet main pipe 500, and the liquid filtered by the security filter 300 meets the requirements. Clean water; the primary filter 200 communicates with the sand water separator 400 through the sewage main pipe 510. When the primary filter 200 is backwashed, the sewage in the primary filter 200 enters the sewage main pipe 510, and the sand water separator 400 Intercept and filter the filter particles entering the sewage pipe, so as to collect the filter particles.

In the combined filtering system provided in this embodiment, since at least one filtering device filters the liquid in the liquid inlet manifold 100, the filtering device includes a primary filter 200, a security filter 300 and a sand water separator 400, and the primary filter 200 passes through the primary filter 200. Combined with the security filter 300, the security filter 300 re-filters the liquid filtered by the primary filter 200. Compared with using the primary filter 200 alone, the filtration accuracy is significantly improved; The filter particles are filtered and separated when the filter 200 is backwashed, so that the separated filter particles can be collected and reused, and the operation cost is saved.

On the basis of the above embodiment, further, the combined filtration system provided in this embodiment further includes a backwash water header 520 and a backflush gas header 530 communicating with the gas source; the primary filters 200 respectively pass through the first forward blowdown The pipe 511, the first reverse sewage pipe 512 and the first exhaust pipe 513 communicate with the sewage main pipe 510, the primary filter 200 communicates with the liquid outlet main pipe 500 through the first liquid discharge pipe 514, and the primary filter 200 passes through the first liquid inlet. The pipe 515 is in communication with the backwash water main pipe 520 , and the primary filter 200 is in communication with the backwash gas main pipe 530 through the first intake pipe 516 .

Specifically, as shown in FIG. 2 , the backwash water main pipe 520 can be communicated with the liquid outlet main pipe 500 , a backwash pump 521 is connected in series with the backwash water main pipe 520 , and an inlet pipe is provided between the backwash water main pipe 520 and the liquid outlet main pipe 500 . The pump hydraulic control valve 610 and the inlet pump hydraulic control valve 610 are used to control whether the water in the liquid outlet main pipe 500 can enter the backwash water main pipe 520; the air source includes an air compressor and a high-pressure air tank connected with the air compressor, One end of the recoil gas main pipe 530 and the high-pressure gas pipe are provided with an intake master control valve 640 for controlling the on-off of the gas circuit on the recoil gas main pipe 530 and a position close to the outlet of the high-pressure gas tank. The exhaust valve 630 for controlling the exhaust gas, the exhaust valve 630 and the intake master control valve 640 are selectively opened according to the use requirements; the end of the backflush gas main pipe 530 away from the high-pressure gas tank can be communicated with the backwash water main pipe 520. An inlet pump air control valve 620 is arranged between the backflush gas main pipe 530 and the backwash water main pipe 520 , and the inlet pump air control valve 620 is used to control whether the gas in the backflush gas main pipe 530 can enter the backwash water main pipe 520 .

The first reverse blowdown pipe 512 is provided with a backwash blowdown valve 660 with a fluid path on and off, the first forward blowdown pipe 511 , the first exhaust pipe 513 , the first drain pipe 514 , and the first liquid inlet pipe 515 and the first intake pipe 516 are provided with control valves for controlling the on-off of the liquid or gas paths, and the first liquid discharge pipe 514 is also provided with a valve for regulating flow; the primary filter 200 is configured with a forward operating state, a forward Cleaning status and reverse cleaning status.

In the forward running state, the relevant control valves on the liquid inlet branch pipe 110 and the first liquid discharge pipe 514 are opened, and the control valves on other pipelines are closed, so that the liquid in the liquid inlet main pipe 100 enters the liquid inlet pipe 110 into the liquid inlet pipe 110 . Filtration is performed in the primary filter 200 , and the filtered liquid is discharged into the liquid outlet main pipe 500 through the first liquid discharge pipe 514 .

In the forward cleaning state, the relevant control valves on the liquid inlet branch pipe 110 and the first forward sewage pipe 511 are opened, and the control valves on other pipelines are closed, so that the liquid in the liquid inlet main pipe 100 first passes through the liquid inlet branch pipe 110 Enter the primary filter 200 and fill the primary filter 200 , and then allow the water in the primary filter 200 to be discharged into the sewage main pipe 510 through the first forward sewage pipe 511 .

In the reverse cleaning state, first perform step 1: respectively open the control valve on the first reverse sewage pipe 512, the control valve on the first exhaust pipe 513, the control valve on the first liquid inlet pipe 515, and the inlet pump The hydraulic control valve 610 and the air control valve 620 of the inlet pump, the backwash pump 521 enters the backwash water header 520 from the liquid outlet header 500 and the gas enters the backwash water header 520 from the backflush gas header 530 synchronously through the first The liquid inlet pipe 515 is transported into the primary filter 200 for reverse flushing, the flushed waste water is discharged into the sewage main pipe 510 through the first reverse sewage pipe 512, and the gas can be discharged into the sewage main pipe 510 through the first exhaust pipe 513; The rotating impeller of the backwash pump 521 makes the intake air and the intake water mix together, and the filter particles in the primary filter 200 are backwashed under the pressure caused by the pump lift; due to the first exhaust pipe 513 and the first reverse The sewage pipes 512 are all communicated with the sewage main pipe 510, so that the primary filter 200 is in a normal pressure state, so that after the backwash water enters the primary filter 200, a large number of air bubbles are released due to the decrease of pressure, which is conducive to the floating of the dirt. Next, perform step 2: close the inlet pump air control valve 620 and the inlet pump hydraulic control valve 610, and stop the backwash pump 521, so that the liquid in the primary filter 200 is discharged to the sewage through the first reverse sewage pipe 512 under the action of gravity Inside the header 510. Next, step 3 is performed: by controlling the air intake master control valve 640, the gas in the backflushing air main pipe 530 is intermittently made to enter the primary filter 200 through the first air intake pipe 516, so that the filter particles in the primary filter 200 are "boiled". ” state; secondly, step 4 is performed: close the intake master control valve 640 and the valve on the first intake pipe 516, and repeat step 1.

Further, the security filter 300 is communicated with the liquid outlet main pipe 500 through the second liquid inlet pipe 522 and the second liquid discharge pipe 523 respectively, and is located on the liquid outlet main pipe 500 and located in the second liquid inlet pipe 522 and the second liquid discharge pipe 523 A first branch control valve 524 is arranged therebetween; the security filter 300 communicates with the backflushing gas main pipe 530 through the second intake pipe 525 , and the security filter 300 communicates with the sewage main pipe 510 through the second sewage pipe 526 .

Specifically, the second liquid inlet pipe 522, the second liquid discharge pipe 523, the second air inlet pipe 525 and the second sewage pipe 526 are all provided with control valves for controlling the on-off of the liquid or gas path. When the control valve 524 is controlled and the control valves on the second liquid inlet pipe 522, the second liquid discharge pipe 523, the second intake pipe 525 and the second sewage pipe 526 are all closed, the security filter 300 is in an isolated state, and can be The security filter 300 is repaired; in addition, the security filter 300 is configured with a forward filtering state and a reverse sewage discharge state.

In the forward filtering state, close the first branch control valve 524, and close the control valves on the second sewage pipe 526 and the second intake pipe 525. At this time, the security filter 300 is connected in series with the liquid outlet main pipe 500, and the liquid outlet main pipe The liquid in 500 filtered by the primary filter 200 enters the security filter 300 through the second liquid inlet pipe 522 for filtration, and then is discharged into the liquid outlet main pipe 500 through the second liquid discharge pipe 523 .

In the reverse blowdown state, the control valve on the second drain pipe 523 is closed, the control valve on the second blowdown pipe 526 is opened, and the control valves on the second liquid inlet pipe 522 and the second inlet pipe 525 are opened intermittently, so that The liquid in the liquid outlet main pipe 500 enters the security filter 300 through the second liquid inlet pipe 522 intermittently, and the gas in the backflushing gas main pipe 530 enters the security filter 300 through the second inlet pipe 525 intermittently, which is very important for the security The gas-liquid two-phase after back-flushing of the filter 300 is discharged into the sewage main pipe 510 through the second sewage pipe 526 .

Further, the sand-water separator 400 is communicated with the sewage main pipe 510 through the third liquid inlet pipe 531, the third liquid discharge pipe 532 and the third sewage pipe 533 respectively, and the third sewage pipe 533 is connected with the filter material collector 410 in series; A second branch control valve 534 is arranged on the sewage main pipe 510 and located between the third liquid inlet pipe 531 and the third sewage pipe 533; The liquid outlet main pipe 500 communicates with the sand-water separator 400 through the fourth liquid inlet pipe 536 .

Specifically, the third liquid inlet pipe 531 , the third liquid discharge pipe 532 , the third sewage pipe 533 , the third air inlet pipe 535 and the fourth liquid inlet pipe 536 are all provided with control valves for controlling the on-off of the liquid circuit or the gas circuit , when the second branch control valve 534 is opened, the liquid in the sewage main pipe 510 can be discharged without being filtered by the sand water filter, and the sand water filter can be repaired at this time; There are forward sand filter state, reverse sand wash state and sand discharge state.

In the positive sand filtering state, close the second branch control valve 534, close the control valves on the third sewage pipe 533, the third inlet pipe 535 and the fourth liquid inlet pipe 536, and open the third liquid inlet pipe 531 and the third liquid inlet pipe 531. The control valve on the third liquid discharge pipe 532. At this time, the sand-water separator 400 is equivalent to being connected in series with the sewage main pipe 510. The liquid in the sewage main pipe 510 enters the sand-water separator 400 through the third liquid inlet pipe 531 for filtration, and then It is discharged into the sewage main pipe 510 through the third liquid discharge pipe 532 .

In the reverse sand flushing state, close the control valve on the third liquid inlet pipe 531, open the control valve on the fourth liquid inlet pipe 536, and intermittently open the control valve on the third inlet pipe 535, so that the liquid outlet main pipe 500 The liquid enters the sand-water separator 400 through the fourth liquid inlet pipe 536, and the gas in the backflushing gas main pipe 530 enters the sand-water separator 400 through the third inlet pipe 535 to reverse the collected filter particles. After cleaning, the cleaned waste liquid and exhaust gas are discharged into the sewage main pipe 510 through the third liquid discharge pipe 532 .

In the sand discharge state, close the control valves on the fourth liquid inlet pipe 536 and the third air inlet pipe 535, and open the control valve on the third sewage pipe 533, so that the collected filter particles enter the filter material under the impact of the residual liquid In the collector 410, at the same time, the liquid is discharged into the sewage main pipe 510 through the third sewage pipe 533.

In the combined filtration system provided in this embodiment, by combining the primary filter 200 and the security filter 300, the filtration precision of sewage is greatly improved, and the sand-water separator 400 can discharge the waste water discharged from the primary filter 200 during backwashing. The filter material is collected, and the sustainable use is good. The primary filter 200, the security filter 300 and the sand-water separator 400 are all capable of reverse flushing and sewage discharge, which can avoid clogging of the three, and can be used more efficiently.

On the basis of the above embodiment, further, the primary filter 200 in the combined filtration system provided by this embodiment includes a container body 210, a first head 220 and a second head 230; the first head 220 and the container The bottom of the body 210 is sealedly connected, the second head 230 is sealed with the top of the container body 210, the first head 220 is provided with a first water outlet 211, the second head 230 is provided with a second water outlet 212, the container A water inlet 213 is provided on the side wall of the main body 210 . Moreover, the container body 210 is made of PVC material.

Specifically, as shown in FIG. 3 , the container body 210 is configured as a pipe made of PVC. Compared with the ordinary carbon steel pipe body, the container body 210 made of PVC has significantly improved corrosion resistance. The first sealing head 220 and the second sealing head 210 The heads 230 are all made of metal material; the container body 210, the first head 220 and the second head 230 are combined to form the primary filter 200 in this embodiment, and the first water outlet 211 is respectively connected to the first positive sewage pipe 511, the first air inlet pipe 516, the first liquid discharge pipe 514 and the first liquid inlet pipe 515 are communicated, the second water outlet 212 is communicated with the first exhaust pipe 513, and the second water outlet 212 is used for liquid discharge or exhaust, The water inlet 213 is communicated with the liquid inlet branch pipe 110 and the first reverse sewage pipe 512 respectively.

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

Specifically, the diversion part 240 can be provided with various structures such as a diversion ring and a reverse flow block. The diversion part 240 is used to prevent the liquid from being directly filtered by the filter layer formed by the filtering particles from the water inlet 213 along the inner wall of the container body 210 flow to the first water outlet 211 .

Further, the guide portion 240 includes a plurality of guide rings 241 arranged in sequence along the length direction of the container body 210 , and the plurality of guide rings 241 are sealed with the inner wall of the container body 210 ; the top of the guide ring 241 is sealed. The surface is perpendicular to the inner wall of the container body 210 , and the bottom surface of the guide ring body 241 is set as an arc surface whose diameter decreases from bottom to top.

Specifically, as shown in FIGS. 3 and 4 , a plurality of guide rings 241 are evenly spaced along the length direction of the container body 210 , and the guide rings 241 are attached to the inner wall of the container body 210 and are bonded by the sealant 224 On the inner wall of the container body 210 and the container body 210 is provided with a through hole, a connecting member such as a screw can pass through the through hole to be connected to the guide ring body 241 to improve the fixing effect of the guide ring body 241, the through hole The inside is filled with sealant 224 to ensure the tightness 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 liquid entering the container body 210 through the water inlet 213 flows in 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 flow ring body 241 is preferably set as a tapered surface with a reduced diameter from bottom to top, which facilitates the upward movement of filtered particles during backwashing of the primary filter 200 .

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

Specifically, as shown in FIG. 5 , the accommodating groove is set as an annular groove, the sealing gasket 223 is set as an annular rubber gasket 223, the bottom end face of the container body 210 is in contact with the sealing gasket 223 for sealing, and the accommodating groove is filled with The sealant 224 ensures the sealing between the container body 210 and the head flange 222; it changes the traditional sealing method of flange-to-flange, plane-to-plane and the rubber gasket sandwiched in the middle, and adopts a specially designed annular sealing method. The groove sealing method has multiple sealing effects.

Further, a container flange 225 is provided on the outer wall of the container body 210, and the container flange 225 is connected with the head flange 222 through a connecting piece.

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 head flange 222 can be welded on the head, and the connecting piece includes connecting bolts. The connection bolts firmly connect the container flange 225 and the head flange 222 as a whole, which improves the connection reliability between the first head 220 and the container body 210 . 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 described above, and will not be repeated here.

Further, a support portion 250 is fixedly connected to the first head 220, a cover portion 260 is detachably connected to the support portion 250, and a partition net 270 is sandwiched between the support portion 250 and the cover portion 260, and the filter particles are supported on the on the screen 270.

Specifically, the support part 250 can be configured as a porous support plate or a support body with a flange structure, the structure of the cover part 260 and the structure of the support part 250 can be set to be the same, and the cover part 260 can be connected with the support part 250 by bolts, The separator 270 is selected as a metal mesh sheet with a suitable aperture according to requirements. The separator 270 is sandwiched between the support portion 250 and the cover portion 260 . The separator 270 is used to support the filtering particles in the primary filter 200 .

Further, the support portion 250 includes a support flange 251 and a plurality of first support plates 252 connected to the support flange 251, and the support flange 251 is fixedly connected to the inner wall of the first head 220; the cover portion 260 includes a cover flange 261 and a plurality of second support plates 262 connected to the cover flange 261 , the cover flange 261 is detachably connected to the support flange 251 , and the partition net 270 is sandwiched between the first support plate 252 and the second support plate 262 .

Specifically, as shown in FIG. 5 and FIG. 6 , the support flange 251 is welded on the inner wall of the first head 220 , the first support plate 252 and the second support plate 262 can both be made of stainless steel flat steel, and the first support plate 252 is welded on the support flange 251, the second support plate 262 is welded on the cover flange 261, and the cover flange 261 is fixed on the support flange 251 by bolts; by setting the first support plate 252 and the second support plate 262, The support area for the separator 270 is increased, on the one hand, the positive support ability of the separator 270 for filtering particles is improved, and on the other hand, the deformation of the separator 270 under the action of hydraulic force during backwashing is reduced.

The combined filtering system provided in this embodiment, by disposing the diversion portion 240 on the inner wall of the container body 210, prevents the liquid from flowing out directly along the inner wall of the container body 210 without being filtered by the filter layer, thereby improving the filtering ability of the liquid; The upper and lower ends of the container body 210 are respectively protruded into the accommodating groove to be sealed and connected to the second head 230 and the first head 220, and the accommodating groove is filled with sealant 224, which changes the traditional flange clamping rubber The sealing structure of the pad has better sealing effect.

On the basis of the above embodiment, further, the security filter 300 in the combined filtering system provided by this embodiment includes a filter tank 310 and at least one filter core 320; the filter tank 310 is provided with a mounting plate 311 , the mounting plate 311 separates the filter tank 310 into a liquid inlet chamber and a liquid outlet chamber, the top of the filter tank 310 is provided with a filter tank exhaust port 312 that communicates with the liquid inlet chamber, and the filter tank 310 The side of the filter tank is provided with a filter tank liquid inlet 313 and a filter tank sewage outlet 315 that communicate with the liquid inlet chamber, and the bottom of the filter tank body 310 is provided with a filter tank liquid outlet 314 communicated with the liquid outlet chamber; 320 is installed 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 , the number of filter elements 320 may be one, two or more. When there are multiple filter elements 320 , the multiple filter elements 320 are installed on the mounting plate 311 ; The second drain pipe 526 is connected, the filter tank liquid inlet 313 is connected with the second liquid inlet pipe 522, the filter tank liquid outlet 314 is connected with the second drain pipe 523, and the filter tank exhaust port 312 can be connected with the second drain pipe through the pipe Tube 526 communicates.

Further, the filter element 320 includes a filter element body 321, a porous central pipe 322 and a shunt 330 arranged in the porous central pipe 322; After filtering, it enters into the porous central pipe 322, the bottom end of the porous central pipe 322 is provided with a central pipe air inlet 323, and the side wall of the porous central pipe 322 is provided with a central pipe water outlet 324; The gas entering the porous central tube 322 from the air inlet 323 is dispersed, so that the gas spreads along the radial direction of the filter element 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 and outer support bodies. The inner support body and the outer support body can be configured as a mesh frame structure. The pore size of the metal filter screen is preferably less than 0.1 micron; the side wall of the porous central tube 322 is provided with a plurality of micropores, and the liquid in the liquid inlet chamber is filtered by the filter element body 321 and then flows into the porous central tube 322 through the micropores. The water outlet 324 of the central pipe flows into the liquid outlet chamber, and the air inlet 323 of the central pipe communicates with the second air inlet pipe 525 . The separation part can be set as a splitter plate or a baffle type structure, so that the gas entering the porous center pipe 322 through the center pipe air inlet 323 is blown more in a direction perpendicular to the inner wall of the filter element body 321 to trap the filter element body 321 Hair, fibrous stains, etc. are blown off.

Further, the diverting part 330 includes a central shaft 331 and a plurality of diverting sheets 332 arranged in sequence along the central shaft 331; The top of the filter element body 321 is connected; the splitter piece 332 is detachably connected to the central shaft 331, so as to be able to adjust the distance between any two adjacent splitter pieces 332, and the surrounding area between any two adjacent splitter pieces 332 and the filter element body 321 can be adjusted. A split chamber is provided, and the gas enters the multiple split chambers in sequence through the central pipe air inlet 323 .

Specifically, the central shaft rod 331 is set as a fully threaded screw rod, a plurality of splitting pieces 332 are sleeved on the central shaft rod 331, and a fastening nut is provided on the upper and lower sides of each splitting piece 332, which is convenient for adjustment on the one hand. The size of the shunt chamber between the two adjacent shunt sheets 332 is convenient for fixing the shunt sheets 332 on the central shaft 331 on the other hand. As shown in FIG. 10 , a part of the gas entering the porous center pipe 322 through the center pipe air inlet 323 moves in the radial direction of the filter element body 321 after hitting the splitting sheet 332 , and the other part passes through the splitting sheet 332 and the porous central pipe 322 The gaps between them enter into adjacent shunt chambers, and the movement state of the gas in the adjacent shunt chambers is the same as the above-mentioned movement state; in this way, the dirt trapped by the filter element body 321 can be strongly peeled off.

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

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

Specifically, the filter layer may be composed of volcanic rock alone, or the filter layer may be composed of sintered microporous particles alone, or the filter layer may be formed by a combination of volcanic rock and sintered microporous particles; preferably, the thickness of the filter layer is set to 3 meters; In addition, the specific gravity of the filter particles is set to 1.1-1.5g/cm ³ , the compressive strength is set to 6Mpa, the shear strength is set to 4Mma, the surface area is set to 13--25㎡/g, and the particle size range is set to 0.3--- 5 mm, and by controlling the above parameters of filtering particles, the filtering precision of the security filter 300 provided in this embodiment can reach 0.1 micron.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

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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