CN220159391U - Liquid filtering system capable of being recycled and washed - Google Patents

Abstract

The utility model relates to a liquid filtering system capable of being recycled and washed, which comprises a filtering tank provided with an opening, a cover plate covering the opening and a filtering assembly, wherein the filtering tank is respectively connected with a liquid inlet pipe, a liquid outlet pipe and a collecting pipe; the liquid inlet pipe is provided with a first valve, the liquid outlet pipe is provided with a second valve, the collecting pipe is respectively connected with a return pipe and a waste liquid pipe, and the return pipe and the waste liquid pipe are respectively provided with a third valve; also comprises a flushing assembly; the flushing assembly comprises a cleaning pipe connected with the liquid outlet pipe, a pressurizing device and a flushing device which are respectively connected with the cleaning pipe, and a fourth valve is arranged on the cleaning pipe. Before the filter components in the filter tank are cleaned, all the stock solution in the tank body is recovered in a mode of pressurizing the tank body, so that the waste of the stock solution is avoided. After the recovery is completed, the filter assembly can be further cleaned through the flushing device, and the better cleaning effect of the filter assembly can be achieved without disassembling the filter assembly.

Description

Liquid filtering system capable of being recycled and washed

Technical Field

The present utility model relates to the field of filtration systems, and more particularly to a recyclable and flushable liquid filtration system.

Background

The filter tank is used in the production and manufacture of various industries, and basically, the principle is that stock solution enters the filter tank from a liquid inlet pipe, after the stock solution is filtered by a filter component in the filter tank, filtrate can flow out from a liquid outlet end of the filter component to a liquid outlet pipe of the filter tank, and finally flows out from the liquid outlet pipe to the next process. Wherein the filter element in the filter tank needs to be cleaned after a long period of use, or the filter element may be clogged. However, the prior art cleaning the filter element often requires that the stock solution in the filter tank is completely drained, and then the filter element is taken out for flushing or clean water is reversely flushed into the filter tank for flushing. The mode that adopts taking out the filter house and wash needs to realize cleaning better, but dismantles and install all very time consuming, often adopts this kind of mode can lead to production efficiency's reduction, consequently generally adopts the back flush mode, only need carry out the dismantlement washing when carrying out big maintenance after longer time use. The stock solution and the water used for cleaning are discharged as waste liquid, which causes more stock solution waste.

Disclosure of Invention

The utility model provides a recyclable and washable liquid filtering system which can recycle the stock solution in a filtering tank in order to solve the problem that the stock solution is wasted when a filtering component in the filtering tank is cleaned in the prior art.

In order to solve the technical problems, the utility model adopts the following technical scheme: the liquid filtering system capable of being recycled and washed comprises a filtering tank provided with an opening, a cover plate covering the opening and a filtering assembly, wherein the filtering tank is respectively connected with a liquid inlet pipe, a liquid outlet pipe and a collecting pipe; the liquid inlet pipe is provided with a first valve, the liquid outlet pipe is provided with a second valve, the collecting pipe is respectively connected with a return pipe and a waste liquid pipe, and the return pipe and the waste liquid pipe are respectively provided with a third valve; also comprises a flushing assembly; the flushing assembly comprises a cleaning pipe connected with the liquid outlet pipe, a pressurizing device and a flushing device, wherein the pressurizing device and the flushing device are respectively connected with the cleaning pipe, and a fourth valve is arranged on the cleaning pipe.

In the above technical scheme, the stock solution that needs to be filtered enters into the filtration jar from the feed liquor pipe, and after filtering the subassembly filtration, the filtrate flows out from the drain pipe, and when filtering, first valve and second valve are in open state, and third valve and fourth valve are in closed state. When the filter assembly is required to be cleaned, the first valve is closed, the fourth valve and the third valve on the return pipe are opened, the pressurizing device is started, the pressure is increased into the filter tank through the liquid outlet pipe, and under the action of the pressure, the stock solution and the filtrate still remained on the filter assembly can flow back to the previous working procedure through the return pipe; after the reflux is completed, the pressurizing device is closed, the third valve on the reflux pipe is closed, the third valve on the waste liquid pipe is opened, and the flushing device is started. The flushing device injects clear water into the filtering tank to further flush the filtering component, and waste water generated in the flushing process is discharged from the waste liquid pipe and does not flow back to avoid affecting the stock solution.

Preferably, the pressurizing device includes an air pipe communicating with the purge pipe and an air supply machine communicating with the air pipe. The gas supply is capable of providing a compressed gas which is used to pressurize the filter tank without contaminating the stock solution, wherein the gas may be an inert gas. The filter tank can be provided with an exhaust valve, and after the liquid is emptied, the gas is exhausted through the exhaust valve.

Preferably, the flushing device comprises a water adding pipe communicated with the cleaning pipe, a water pump connected with the water adding pipe and a water tank communicated with the water pump. The water pump pressurizes the water in the water tank and gets into the jar body through the water pipe follow drain pipe after, washes the filter component along the reverse direction of filtrate, and the clear water after the pressurization has more sufficient pressure to wash the filter component.

Preferably, the water feeding pipe and the air pipe are both provided with fifth valves. And opening the corresponding fifth valve under different running states to prevent the clean water of the water feeding pipe from flowing into the air pipe, and the air of the air pipe enters the water feeding pipe.

Preferably, the collection tube is connected to the bottom of the filter canister. The collecting pipe is positioned at the bottom of the filtering tank to enable the liquid in the filtering tank to be completely discharged.

Preferably, the filter assembly comprises a partition plate arranged in the filter tank and a plurality of filter parts connected with the partition plate, a filter cavity is formed between the partition plate and the cover plate, the liquid outlet pipe is communicated to the filter cavity, and the liquid outlet end of the filter part is connected with the partition plate and communicated to the filter cavity. The filtering part can be a filter element, the liquid outlet end of the filter element is connected with the partition board, and filtrate flows into the filter cavity from the liquid outlet end in the filter element in an overflow mode, and then flows out of the liquid outlet pipe. The filter part has a plurality of, can wash simultaneously when washing, and when dismantling the maintenance, just can lift up whole filter core by lifting the baffle.

Preferably, the partition board is connected with the cover board through a connecting piece; the inner wall of the filter tank is provided with a convex ring, and the baffle plate is abutted with the top surface of the convex ring. When the filter element needs to be replaced or cleaned, the partition plate and the filter part can be removed together by only lifting the cover plate, and compared with the mode that different parts are taken out for multiple times separately, the operation is more convenient. The baffle and the filter core can both bring pulling force for the connecting piece, in order to make the connecting piece not need unsettled and bear the pulling force that baffle and filter core brought for a long time and lead to the circumstances such as deformation damage, give baffle bearing power through the bulge loop, and the filter tank of itself also can give the apron bearing, can ensure that connecting portion does not deform and damage.

Preferably, the filtering tank is provided with at least two groups, and liquid inlet pipes of the two filtering tanks are connected with the stock solution pipe; and the liquid outlet pipes of the two filtering tanks are respectively connected with the cleaning pipe and the collecting pipe. In order to be able to filter simultaneously also when the filter assembly is being cleaned, two filter tanks are provided, wherein the filter tank is being cleaned and the other filter is being subjected to a filtering operation. Wherein in the cleaned filter tank, a first valve corresponding to the liquid inlet pipe is closed, and a second valve corresponding to the liquid outlet pipe is opened; and the other filtering tank is provided with a first valve of the liquid inlet pipe, a second valve is opened, the stock solution enters from the liquid inlet pipe for filtering, and the filtrate enters from the liquid outlet pipe to the collecting pipe and flows out.

Preferably, the liquid outlet pipes of the two filtering tanks are respectively connected with the cleaning pipe and the collecting pipe through four-way connectors. Two drain pipes, cleaning pipes and collecting pipes are respectively connected through the four-way connector, so that connecting components can be reduced, the circuit is easier to lay out, but when cleaning is carried out, only filtering is carried out, and filtrate cannot be discharged.

Preferably, the liquid outlet pipes of the two filtering tanks are respectively connected with the cleaning pipe through branch pipes, sixth valves are arranged on the branch pipes, and the branch pipes are positioned between the second valves and the filtering tanks; the tail end of the liquid outlet pipe is connected with the collecting pipe through a tee joint connector. By arranging the branch pipe, the back flushing assembly and the filtering of the stock solution are completely separated, and the two filtering tanks can be used for respectively carrying out back flushing and filtrate outflow without mutual influence.

Compared with the prior art, the utility model has the beneficial effects that: before the filter components in the filter tank are cleaned, all the stock solution in the tank body is recovered in a mode of pressurizing the tank body, so that the waste of the stock solution is avoided. After the recovery is completed, the filter assembly can be further cleaned through the flushing device, and the better cleaning effect of the filter assembly can be achieved without disassembling the filter assembly.

Drawings

FIG. 1 is a schematic diagram of a liquid filtration system capable of being recovered and flushed according to embodiment 1 of the present utility model;

FIG. 2 is a schematic diagram showing the structure of a liquid filtering system capable of recycling and flushing according to embodiment 2 of the present utility model;

fig. 3 is a schematic structural diagram of the arrangement of the bypass pipe in embodiment 3.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there are orientations or positional relationships indicated by terms "upper", "lower", "left", "right", "long", "short", etc., based on the orientations or positional relationships shown in the drawings, this is merely for convenience in describing the present utility model and simplifying the description, and is not an indication or suggestion that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationships in the drawings are merely for exemplary illustration and are not to be construed as limitations of the present patent, and that it is possible for those of ordinary skill in the art to understand the specific meaning of the terms described above according to specific circumstances.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The technical scheme of the utility model is further specifically described by the following specific embodiments with reference to the accompanying drawings:

example 1

As shown in fig. 1, an embodiment 1 of a liquid filtering system capable of being recovered and flushed comprises a filtering tank 1 provided with an opening, a cover plate 2 covering the opening and a filtering assembly 3, wherein the filtering tank 1 is respectively connected with a liquid inlet pipe 4, a liquid outlet pipe 5 and a collecting pipe 6; a first valve 401 is arranged on the liquid inlet pipe 4, a second valve 501 is arranged on the liquid outlet pipe 5, the collecting pipe 6 is respectively connected with a return pipe 601 and a waste liquid pipe 602, and the return pipe 601 and the waste liquid pipe 602 are respectively provided with a third valve 603; also comprises a flushing assembly; the flushing assembly comprises a cleaning tube 7 connected with the liquid outlet tube 5, a pressurizing device 8 and a flushing device 9 respectively connected with the cleaning tube 7, and a fourth valve 701 is arranged on the cleaning tube 7.

Specifically, the pressurizing device 8 includes an air pipe 801 communicating with the purge pipe 7 and an air feeder 802 communicating with the air pipe 801. The gas supply 802 can supply compressed gas, which may be an inert gas, to pressurize the canister 1 without contaminating the stock solution. The filter tank 1 may be provided with an exhaust valve through which the gas is exhausted after the liquid is exhausted. The flushing device 9 includes a water supply pipe 901 communicating with the cleaning pipe 7, a water pump 902 connected to the water supply pipe 901, and a water tank 903 communicating with the water pump 902. The water pump 902 pressurizes the water in the water tank 903, and then enters the tank body from the liquid outlet pipe 5 through the water adding pipe 901, and washes the filter assembly 3 along the reverse direction of the filtrate, and the pressurized clean water has more sufficient pressure to wash the filter assembly 3. The fifth valve 10 is provided on both the water feed pipe 901 and the air pipe 801. The corresponding fifth valve 10 is opened under different running states, so that clean water of the water adding pipe 901 is prevented from flowing into the air pipe 801, and air of the air pipe 801 enters the water adding pipe 901.

In this embodiment, the collection tube 6 is connected to the bottom of the filter canister 1. The collection pipe 6 is positioned at the bottom of the filter tank 1 to allow the liquid in the filter tank 1 to be completely discharged.

Specifically, the filter assembly 3 includes a partition 301 installed in the filter tank 1 and a plurality of filter portions 302 connected to the partition 301, a filter chamber 303 is formed between the partition 301 and the cover 2, the liquid outlet pipe 5 is connected to the filter chamber 303, and the liquid outlet end of the filter portion 302 is connected to the partition 301 and the liquid outlet end is connected to the filter chamber 303. The filter part 302 may be a filter cartridge, the liquid outlet end of which is connected to the partition 301 and from which filtrate flows in the filter cartridge in an overflow manner to the filter chamber 303 and then out of the liquid outlet pipe 5. The filter unit 302 has a plurality of filter units, and can be simultaneously washed when washed, and the filter units can be lifted by lifting the partition 301 when the filter units are detached for maintenance.

Wherein, baffle 301 is provided with the through-hole, and the play liquid end and the through-hole of filter core are connected, and the filtrate overflows to filter chamber 303 through the through-hole, and the one end that the play liquid end was kept away from to the filter core is the blind end and all is connected with the parallel plate, because the stoste gets into jar body 1 and has certain pressure, connects the blind end of all filter cores on same parallel plate can avoid liquid pressure to strike single many filter cores and lead to this filter core to take place rotatory whereabouts or give the certain lateral pressure of through-hole and lead to baffle 301 to warp.

Further, the partition 301 is connected to the cover plate 2 through the connection member 11; the inner wall of the filter tank 1 is provided with a convex ring 101, and the partition 301 is abutted against the top surface of the convex ring 101. When the filter element needs to be replaced or cleaned, the partition 301 and the filtering part 302 can be removed together by only lifting the cover plate 2, so that the operation is more convenient compared with the operation of taking out different parts for a plurality of times. The baffle 301 and the filter core can both bring pulling force to the connecting piece 11, so that the connecting piece 11 does not need to be suspended for a long time and bear the pulling force brought by the baffle 301 and the filter core to cause deformation, damage and other conditions, the baffle 301 is provided with bearing force through the convex ring 101, the filter tank 1 can also support the cover plate 2, and the connecting part can be ensured not to deform and damage. The more the connecting pieces 11 are connected with the cover plate 2 and the partition 301, the thicker the thickness is, the higher the connecting strength of the connecting pieces is, so in this embodiment, the connecting pieces are connected into a plate-shaped piece and are enclosed into a ring shape, and then the connecting ports are added on the annular plate-shaped piece, the two ends of the connecting pieces 11 are welded with the cover plate 2 and the partition 301, the connecting range of the connecting pieces 11 and the connecting pieces 2 and the partition 301 is larger, the connecting mode is firmer, and the connecting strength of the cover plate 2, the connecting pieces 11 and the partition 301 is close to the best state. The filtrate of the filter chamber 303 can flow out from the communication port.

In addition, in this embodiment, in order to facilitate disassembly and maintenance of the filter assembly 3, a lifting lug is added to the top surface of the cover plate 2.

The working principle or workflow of the present embodiment: the feed liquor pipe 4 is located between baffle 301 and the bottom of filtration jar 1, and the stock solution that needs to filter gets into in filtration jar 1 from feed liquor pipe 4, and after the filtration of filter core, the filtrate overflows to filter chamber 303 from the play liquid end of filter core, then flows out from drain pipe 5, and when filtering, first valve 401 and second valve 501 are in the open state, and third valve 603 and fourth valve 701 are in the closed state. When the filter assembly 3 needs to be cleaned, the first valve 401 is closed, the fourth valve 701 and the third valve 603 on the return pipe 601 are opened, the pressurizing device 8 is started, the fifth valve 10 on the air pipe 801 is opened, compressed gas passing through the gas supply machine 802 enters the filter tank 1 through the gas adding pipe and the liquid outlet pipe 5, the pressure in the filter tank 1 is increased, and under the action of the pressure, the stock solution and the filtrate still remained on the filter assembly 3 can flow back to the previous working procedure through the return pipe 601; after the back flow is completed, the pressurizing device 8 is closed, the third valve 603 on the back flow pipe 601 and the fifth valve 10 on the air pipe 801 are closed, the third valve 603 on the waste liquid pipe 602 and the fifth valve 10 of the water adding pipe 901 are opened, the water pump 902 is started, the water pump 902 is used for pressurizing and injecting the liquid in the water tank 903 into the filter tank 1, the filter assembly 3 is further washed, the waste water generated in the washing process is discharged from the waste liquid pipe 602, and the back flow is not performed so as to avoid influencing the stock solution.

The beneficial effects of this embodiment are: before the filter assembly 3 in the filter tank 1 is cleaned, all the stock solution in the tank body is recovered by pressurizing the tank body, so that the waste of the stock solution is avoided. After recycling, the filter assembly 3 can be further cleaned by the flushing device, so that the filter assembly 3 can be cleaned better without being removed, and the filter assembly 3 can be cleaned better.

Example 2

Example 2 of a liquid filtration system which can be recovered and rinsed, on the basis of example 1, differs from example 1 in that, as shown in fig. 2, the filtration tanks 1 are provided with two groups, and the liquid inlet pipes 4 of both filtration tanks 1 are connected with the stock solution pipe 12; the liquid outlet pipes 5 of the two filter tanks 1 are respectively connected with the cleaning pipe 7 and the collecting pipe 13 through four-way connectors 14.

In order to be able to filter simultaneously also when the filter assembly 3 is being cleaned, two filter canisters 1 are provided, wherein the filter canisters 1 are being cleaned and the other filter is being filtered. Wherein when the filter tank 1 is cleaned, the first valve 401 of the liquid inlet pipe 4 of the filter tank 1 to be cleaned is closed, the second valve 501 of the liquid outlet pipe 5 is opened, the fourth valve 701 of the cleaning pipe 7 is opened, and the third valve 603 of the recovery pipe is opened, and the cleaning process as in the embodiment 1 is performed. While the other filter tank 1 still performing the filtering operation has its first valve 401 of the feed pipe 4 opened and its second valve 501 of the discharge pipe 5 closed, and the raw liquid enters from the feed pipe 4 performing the filtering operation, and the filter element in the filter element overflows into the filter chamber 303 and accumulates in the filter chamber 303.

The solution of this embodiment connects two drain pipes 5, cleaning pipes 7 and collecting pipes 13 through four-way connectors 14 respectively, so that the number of connecting parts can be reduced, the circuit is easier to be laid out, but when cleaning is performed, only filtering is performed, and the filtrate cannot be discharged.

The remaining operation principle and effects of the present embodiment are identical to those of embodiment 1.

Example 3

An embodiment 3 of a liquid filtering system which can be recovered and flushed, based on the above embodiment 1 or embodiment 2, differs from embodiment 2 in that, as shown in fig. 1 and 3, the filtering tanks 1 are provided with two groups, the liquid inlet pipes 4 of both filtering tanks 1 are connected with the stock liquid pipe 12; the liquid outlet pipes 5 of the filter tanks 1 are respectively connected with the cleaning pipes 7 through branch pipes 15, sixth valves 1501 are arranged on the branch pipes 15, and the branch pipes 15 are positioned between the second valves 501 and the filter tanks 1; the tail end of the liquid outlet pipe 5 is connected with the collecting pipe 13 through a three-way connector 16.

In order to be able to filter simultaneously also when the filter assembly 3 is being cleaned, two filter canisters 1 are provided, wherein the filter canisters 1 are being cleaned and the other filter is being filtered. Wherein at the time of cleaning the filter tank 1, the first valve 401 of the liquid inlet pipe 4 of the filter tank 1 to be cleaned is closed, the second valve 501 of the liquid outlet pipe 5 is opened, the fourth valve 701 of the cleaning pipe 7 is opened, the third valve 603 of the recovery pipe is opened, the seventh valve 17 is closed, and the sixth valve 1501 connected to the liquid inlet pipe 4 is opened, and the cleaning process as in embodiment 1 is performed. And the other filter tank 1 still performing the filtering operation is characterized in that the first valve 401 of the liquid inlet pipe 4 is opened, the second valve 501 of the liquid outlet pipe 5 is opened, the seventh valve 17 is opened, all other valves are closed, the raw liquid enters from the liquid inlet pipe 4 performing the filtering operation, the filter element in the filter element overflows into the filter cavity 303 and flows out from the liquid outlet pipe 5 and flows into the collecting pipe 13 through the liquid outlet pipe 5, and the outflow of the filtrate is realized.

The filtration of the two filter tanks 1 and the flushing of the filter assembly 3 and the recovery of the stock solution are completed separately, and the two filter tanks 1 can complete respectively different works without mutual influence.

The remaining operation principle and effect of the present embodiment are the same as those of embodiment or embodiment 2.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The utility model provides a liquid filtration system that can retrieve and wash, includes a filter tank (1) that is provided with the opening, apron (2) and filtration subassembly (3) that close the opening, filter tank (1) is connected with feed liquor pipe (4), drain pipe (5) and collecting pipe (6) respectively; the device is characterized in that a first valve (401) is arranged on the liquid inlet pipe (4), a second valve (501) is arranged on the liquid outlet pipe (5), the collecting pipe (6) is respectively connected with a return pipe (601) and a waste liquid pipe (602), and the return pipe (601) and the waste liquid pipe (602) are respectively provided with a third valve (603); also comprises a flushing assembly; the flushing assembly comprises a cleaning pipe (7) connected with the liquid outlet pipe (5), and a pressurizing device (8) and a flushing device (9) which are respectively connected with the cleaning pipe (7), wherein a fourth valve (701) is arranged on the cleaning pipe (7).

2. A recyclable and flushable liquid filtration system according to claim 1, characterized in that the pressurizing means (8) comprises an air pipe (801) communicating with the cleaning pipe (7) and an air feeder (802) communicating with the air pipe (801).

3. A recyclable and flushable liquid filtration system according to claim 2, wherein the flushing device (9) comprises a water feed pipe (901) in communication with the cleaning pipe (7), a water pump (902) connected to the water feed pipe (901), and a water tank (903) in communication with the water pump (902).

4. A recyclable and flushable liquid filtration system according to claim 3, characterized in that a fifth valve (10) is provided on both the water feed pipe (901) and the air pipe (801).

5. A liquid filtration system that can be recovered and flushed according to claim 1, characterized in that the collection tube (6) is connected to the bottom of the filtration tank (1).

6. A liquid filtering system capable of being recycled and flushed according to claim 1, wherein the filtering assembly (3) comprises a partition board (301) installed in the filtering tank (1) and a filtering part (302) connected with the partition board (301), a filtering cavity (303) is formed between the partition board (301) and the cover board (2), the liquid outlet pipe (5) is communicated with the filtering cavity (303), a liquid outlet end of the filtering part (302) is connected with the partition board (301) and is communicated with the filtering cavity (303).

7. A liquid filtration system which can be recovered and flushed according to claim 6, characterized in that the partition (301) is connected to the cover plate (2) by means of a connection (11); the inner wall of the filter tank (1) is provided with a convex ring (101), and the partition plate (301) is abutted with the top surface of the convex ring (101).

8. A liquid filtration system capable of being recovered and flushed according to any one of claims 1-7, characterized in that the filter canisters (1) are provided with at least two groups, the liquid inlet pipes (4) of both filter canisters (1) being connected to the stock liquid pipe (12); the liquid outlet pipes (5) of the two filtering tanks (1) are respectively connected with the cleaning pipe (7) and the collecting pipe (13).

9. A liquid filtration system capable of being recovered and flushed according to claim 8, characterized in that the outlet pipes (5) of two of said filter tanks (1) are connected to said cleaning pipe (7) and said collecting pipe (13) respectively by means of four-way connectors (14).

10. A liquid filtering system capable of being recycled and flushed according to claim 8, characterized in that the outlet pipes (5) of two filtering tanks (1) are respectively connected with the cleaning pipe (7) through branch pipes (15), the branch pipes (15) are provided with sixth valves (1501), and the branch pipes (15) are positioned between the second valves (501) and the filtering tanks (1); the tail end of the liquid outlet pipe (5) is connected with the collecting pipe (13) through a tee joint (16).