CN117225068A - Filter device and liquid supply system with same - Google Patents

Abstract

The invention provides a filtering device and a liquid supply system with the same, wherein the filtering device comprises: a first conduit, a second conduit, a filter assembly and a third conduit, the filter assembly comprising a plurality of filter modules, the plurality of filter modules being arranged in series, each filter module comprising a feed inlet, a permeate outlet and a retentate outlet, the retentate outlets of the remaining filter modules of the plurality of filter modules except the first being connected to the feed inlet of the filter module located upstream and immediately thereabout, the feed inlet of the first of the plurality of filter modules being adapted to communicate with the outside, the retentate outlet of the last of the plurality of filter modules being adapted to communicate with the outside, and the permeate outlet of each filter module being selectively connectable to the first and second conduits; the plurality of third pipelines are connected with the retentate outlets of the plurality of filtration modules in a one-to-one correspondence. The filtering device is convenient to clean and has higher practicability.

Description

Filter device and liquid supply system with same

Technical Field

The invention relates to the technical field of cross-flow filtering equipment, in particular to a filtering device and a liquid supply system with the same.

Background

In the field of filtration and separation, cross-flow filtration can enable the flow direction of filtered liquid to be tangential to the direction of a filtering membrane surface, and the shearing force generated when the filtered liquid flows through the filtering membrane surface can take away particles retained on the filtering membrane surface, so that a pollution layer is kept at a thinner level, and the pores of the filtering membrane are not easy to block. The related art filtration device has a plurality of cross-flow filtration modules connected in series, and the filtration device filters the filtered liquid with the plurality of cross-flow filtration modules connected in series. However, the related art filter device is not easy to clean after filtering, resulting in inconvenient use.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the invention provides the filtering device which is convenient to clean and has higher practicability.

The embodiment of the invention also provides a liquid supply system which is provided with the filtering device of the embodiment.

The filtering device of the embodiment of the invention comprises: a first pipe for discharging permeate and a second pipe for inputting cleaning liquid; a filtration assembly comprising a plurality of filtration modules, a plurality of said filtration modules being disposed in series, each filtration module comprising a feed inlet, a permeate outlet and a retentate outlet, the retentate outlets of the remaining ones of the plurality of filtration modules except the first being connected to the feed inlet of the filtration module upstream and immediately thereabout, the feed inlet of the first one of the plurality of filtration modules being adapted to communicate with the outside world, the retentate outlet of the last one of the plurality of filtration modules being adapted to communicate with the outside world, and the permeate outlet of each filtration module being selectively connected to the first and second conduits; and the third pipelines are used for discharging cleaning liquid and are connected with the retentate outlets of the filtering modules in a one-to-one correspondence manner.

According to the filtering device provided by the embodiment of the invention, the permeate outlets of the plurality of filtering modules can be switched to be connected with the first pipeline and the second pipeline, so that the permeate obtained after filtering the liquid to be filtered is discharged through the first pipeline, and the collection of the permeate is completed. And the permeate outlet can be switched to be connected with the second pipeline, so that the cleaning liquid reversely enters the plurality of filter modules to clean the filter modules, and therefore the filter modules are prevented from being blocked, and the practicability of the filter device is improved.

Therefore, the filtering device provided by the embodiment of the invention is convenient to clean and has higher practicability.

In some embodiments, the filtration device further comprises: the first pipeline comprises a plurality of first main pipelines and a plurality of second pipelines, the first main pipelines comprise a first port and a plurality of second ports, one end of each first pipeline is connected with the permeate outlet, the other end of each first pipeline is connected with the first port, the first pipeline comprises a first liquid inlet, the second pipeline comprises a first liquid outlet, and the second ports are communicated with the first liquid inlet and the first liquid outlet; the first control valve is arranged on the first pipeline, and the second control valve is arranged on the second pipeline.

In some embodiments, the filtration device further comprises: the plurality of third control valves are arranged on the plurality of third pipelines in a one-to-one correspondence manner.

In some embodiments, each of the filtration modules comprises: a plurality of membrane filters, each membrane filter comprising an inlet end, a permeate discharge end and a retentate discharge end, the permeate discharge end of each membrane filter being connected to its corresponding first branch line; the second branch pipelines comprise a plurality of second liquid inlets and second liquid outlets, and the second liquid outlets of the plurality of second branch pipelines are connected with the inlet ends of the plurality of membrane filters in a one-to-one correspondence manner; the plurality of third pipelines comprise a third liquid inlet and a third liquid outlet, and the third liquid inlets of the plurality of third pipelines are connected with the retentate discharge ends of the plurality of membrane filters in a one-to-one correspondence manner; the second liquid inlets of the first one of the filter modules are communicated with the outside, the second liquid inlets of the other filter modules except the first one of the filter modules are communicated with the third liquid outlets of the filter modules which are positioned upstream and close to the first one of the filter modules, and the third pipelines are communicated with the third liquid outlets of the corresponding filter modules.

In some embodiments, the number of membrane filters in each of a plurality of the filtration modules is uniform.

In some embodiments, the in-membrane filter element is one of a roll-to-roll filter membrane and a tubular filter membrane.

In some embodiments, the filtration device further comprises: a fifth line for discharging retentate, said fifth line being in communication with the retentate outlet of the last of said filtration modules; and the fourth control valve is arranged on the fifth pipeline.

In some embodiments, the filtration device further comprises: a return line, one end of which is in communication with the feed inlet of the first filtration module, and the other end of which is in communication with the retentate outlet of the last filtration module; a fifth control valve provided on the return line; and one end of the sixth pipeline is communicated with the feed inlet of the first filtering module, and the other end of the sixth pipeline is suitable for being communicated with the outside.

In some embodiments, the filtration device further comprises: the first flow control valve is arranged on the first pipeline, and the second flow control valve is arranged on the fifth pipeline.

The liquid supply system of the embodiment of the invention comprises the filtering device of any embodiment.

Drawings

Fig. 1 is a schematic structural view of a filtering apparatus according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a filtering device according to another embodiment of the present invention.

Reference numerals:

a filtering device 100;

a filter assembly 1; a filter module 11; a feed port 111; a permeate outlet 112; retentate outlet 113; a membrane filter 12; an inlet end 121; permeate discharge end 122; retentate discharge end 123; a second branch line 13; a second liquid inlet 131; a second liquid outlet 132; a third branch line 14; a third liquid inlet 141; a third liquid outlet 142;

a first pipe 21; a first liquid inlet 211; a second conduit 22; a first liquid outlet 221; a third line 23; a fourth line 24; a first main pipe 241; a first port 2411; a second port 2412; a first branch line 242; a fifth line 25; a return line 26;

a first control valve 31; a second control valve 32; a third control valve 33; a fourth control valve 34; a fifth control valve 35; a first flow control valve 36; a second flow control valve 37.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

A filtering apparatus 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

As shown in fig. 1-2, a filter device 100 according to an embodiment of the present invention includes a first pipe 2, a second pipe 22, a filter assembly 1, and a third pipe 23.

The filter assembly 1 comprises a plurality of filter modules 11, the plurality of filter modules 11 being arranged in series, each filter module 11 comprising a feed inlet 111, a permeate outlet 112 and a retentate outlet 113. The retentate outlet 113 of the remaining filtration modules 11 of the plurality of filtration modules 11 except the first is connected to the feed inlet 111 of the filtration module 11 located upstream and immediately adjacent thereto such that one of the plurality of filtration modules 11 delivers filtered retentate to another filtration module 11 located downstream of and adjacent to that filtration module 11 for filtration.

The feed opening 111 of the first one of the plurality of filter modules 11 is adapted to communicate with the outside so that the liquid to be filtered enters the filter assembly 1 through the feed opening 111 of the first one of the plurality of filter modules 11 for filtering. The retentate outlet 113 of the last one of the plurality of filtration modules 11 is adapted to communicate with the outside world such that the last filtration module 11 passes the retentate obtained after filtration out of the filtration assembly 1 for treatment of the portion of the retentate, e.g. the portion of the retentate is again passed into the feed inlet 111 of the first one of the plurality of filtration modules 11 for filtration again.

The permeate outlet 112 of each filtration module 11 is optionally connected to a first line 2 for permeate removal and a second line 22 for purging liquid input. In other words, the permeate outlet 112 of each filtration module 11 communicates with the first conduit 2, so that each filtration module 11 utilizes the first conduit 2 to expel permeate; alternatively, the permeate outlet 112 of each filtration module 11 communicates with the second conduit 22 such that purging liquid enters the plurality of filtration modules 11 through the second conduit 22 for purging the plurality of filtration modules 11. The third pipelines 23 are a plurality of, and the plurality of third pipelines 23 are connected with the retentate outlets 113 of the plurality of filtration modules 11 in a one-to-one correspondence so as to discharge the cleaning liquid out of the filtration modules 11 through the third pipelines 23.

The following describes the implementation of the filtering apparatus 100 according to the embodiment of the present invention, including a filtering mode and a cleaning mode, with reference to the accompanying drawings.

Filtering mode: the permeate outlet 112 of each filtration module 11 is in communication with the first conduit 2. The feed port 111 of the first one of the plurality of filtration modules 11 is fed with a liquid to be filtered, and the liquid to be filtered enters the first filtration module 11 to be filtered, thereby obtaining a permeate and a retentate. Permeate exits the first filtration module 11 through permeate outlet 112 and exits through first conduit 2; the retentate exits through retentate outlet 113 and enters filtration module 11 adjacent and downstream from the first filtration module 11 for filtration. After filtration, a permeate and a retentate are obtained, the permeate exiting the filtration module 11 through a permeate outlet 112 and exiting through the first line 2; the retentate exits through retentate outlet 113 and enters filtration module 11 adjacent and downstream from filtration module 11 for filtration. Until after filtration through the last filtration module 11, the resulting retentate is discharged from the retentate outlet 113 to the outside, and the resulting permeate is discharged from the permeate outlet 112 to the first filtration module 11 and through the first line 2.

Cleaning mode: the permeate outlet 112 of each filtration module 11 is communicated with the second pipeline 22, cleaning liquid is introduced into the second pipeline 22, and the cleaning liquid respectively enters the filtration modules 11 from the permeate outlets 112 through the second pipeline 22, so that the cleaning liquid enters the filtration modules 11 in a direction opposite to the flow direction of the liquid to be filtered, and the filtration modules 11 are cleaned. The cleaned cleaning liquid is discharged through the retentate outlet 113 of each filtration module 11 and is discharged through the third line 23.

The filtering device 100 according to the embodiment of the present invention can switch the connection between the permeate outlets 112 of the plurality of filtering modules 11 and the first pipeline 2 and the second pipeline 22, so that not only can the connection between the permeate outlets 112 and the first pipeline 2 be switched, but also the permeate obtained after the filtering of the liquid to be filtered can be discharged through the first pipeline 2, thereby completing the collection of the permeate. And the permeate outlet 112 can be switched to be connected with the second pipeline 22, so that cleaning liquid reversely enters the plurality of filter modules 11 to clean the filter modules 11, thereby preventing the filter modules 11 from being blocked, and improving the practicability of the filter device 100 of the embodiment of the invention.

Therefore, the filtering device 100 provided by the embodiment of the invention is convenient to clean and has high practicability.

As shown in fig. 1 to 2, the filtering apparatus 100 of the embodiment of the present invention includes a filtering assembly 1, a first pipe 2, a second pipe 22, a third pipe 23, a fourth pipe 24, a first control valve 31, a second control valve 32, a third control valve 33, a fifth pipe 25, a fourth control valve 34, a return pipe 26, a fifth control valve 35, a first flow control valve 36, and a second flow control valve 37.

As shown in fig. 1, the fourth pipeline 24 includes a plurality of first main pipelines 241 and first branch pipelines 242, the first main pipelines 241 include a plurality of first ports 2411 and second ports 2412, the first ports 2411 are connected to the permeate outlet 112 at one end of each first branch pipeline 242, the first ports 2411 are connected to the other end of each first branch pipeline 242, the first pipeline 2 includes a first liquid inlet 211, the second pipeline 22 includes a first liquid outlet 221, and the second ports 2412 are connected to both the first liquid inlet 211 and the first liquid outlet 221. The first control valve 31 is provided on the first pipe 2, and the second control valve 32 is provided on the second pipe 22. In the purge mode, the first control valve 31 controls the first pipe 2 to be disconnected from the first main pipe 241, and the second pipe 22 to be communicated with the first main pipe 241. The cleaning fluid sequentially passes through the second pipeline 22 and the first main pipeline 241, and is subdivided into a plurality of strands which respectively enter the plurality of filter modules 11 through the plurality of first branch pipelines 242 for cleaning. In the filtration mode, the second control valve 32 controls the disconnection of the second line 22 from the first main line 241, the first line 2 communicates with the first main line 241, and permeate filtered by each filtration module 11 is discharged through the first branch line 242, the first main line 241, and the first line 2 in sequence.

In other words, the plurality of filter modules 11 communicate with the first main pipe 241 through the plurality of first branch pipes 242, and the first main pipe 241 is connected to the first pipe 2 and the second pipe 22 through the second port 2412, respectively. The first main pipe 241 is controlled to communicate with one of the first pipe 2 and the second pipe 22 by the first control valve 31 on the first pipe 2 and the second control valve 32 on the second pipe 22, not only is the structure simple, but also the operation is convenient.

In some embodiments, as shown in fig. 1, the third control valves 33 are plural, and the plural third control valves 33 are disposed on the plural third pipelines 23 in a one-to-one correspondence. In other words, in the cleaning mode, the plurality of third control valves 33 are all opened, and the cleaning liquid can be discharged through the third pipeline 23, so that the plurality of filter modules 11 can be cleaned simultaneously; alternatively, the plurality of third control valves 33 are sequentially opened to enable the cleaning liquid to be sequentially discharged through the third pipeline 23 along the flow direction of the cleaning liquid, so that the plurality of filter modules 11 can be cleaned in sections. In the filtration mode, the third control valves 33 are closed to disconnect the third lines 23 from the retentate outlets 113 of the filtration modules 11, preventing retentate from being discharged from the third lines 23, avoiding affecting the filtration efficiency of the filtration apparatus 100 of the present embodiment.

In some embodiments, as shown in fig. 2, each filtration module 11 includes a membrane filter 12, a second branch line 13, and a third branch line 14. The membrane filters 12 are plural, and the membrane filters 12 include an inlet end 121, a permeate discharge end 122 and a retentate discharge end 123, with the permeate discharge end 122 of each membrane filter 12 being connected to its corresponding first branch 242. The second branch pipelines 13 are multiple, each second branch pipeline 13 comprises a second liquid inlet 131 and a second liquid outlet 132, and the second liquid outlets 132 of the second branch pipelines 13 are connected with the inlet ends 121 of the membrane filters 12 in a one-to-one correspondence. The third branch pipes 14 are multiple, each third branch pipe 14 comprises a third liquid inlet 141 and a third liquid outlet 142, and the third liquid inlets 141 of the third branch pipes 14 are connected with the retentate discharge ends 123 of the membrane filters 12 in a one-to-one correspondence.

The plurality of second liquid inlets 131 of the first one of the plurality of filter modules 11 communicate with the outside so that the liquid to be filtered enters the first filter module 11 through the plurality of second liquid inlets 131 of the first filter module 11. The plurality of second liquid inlets 131 of the remaining filter modules 11 except the first one of the plurality of filter modules 11 communicate with the plurality of third liquid outlets 142 of the filter modules 11 located upstream thereof and immediately adjacent thereto, and the plurality of third pipes 23 communicate with the plurality of third liquid outlets 142 of the filter modules 11 corresponding thereto.

In other words, in the filtration mode, the liquid to be filtered sequentially passes through the second liquid inlets 131 and the second liquid outlets 132 of the plurality of second branch pipes 13 and enters the inlet ends 121 of the plurality of membrane filters 12, respectively, so as to enter the membrane filters 12 for filtration. The permeate obtained after filtration is sequentially introduced into the first main pipe 241 through the permeate discharge end 122 and the first branch pipe 242, and is sequentially discharged out of the one filtration module 11 through the third liquid inlet 141 and the third liquid outlet 142 of the retentate discharge end 123. Therefore, a plurality of membrane filters 12 are arranged in parallel in each filter module 11, and after the membrane filters 12 in each filter module 11 are connected in parallel to form the filter modules 11, the filter modules 11 are connected in series, so that the purpose of reducing the flow and the lift of the circulating pump is achieved, and the running energy consumption and the running cost of the filter device 100 in the embodiment of the invention are further reduced.

Alternatively, the filter element within the membrane filter 12 is one of a roll-type filter membrane and a tubular filter membrane. In other words, the filter element in the membrane filter 12 is a roll-type filter membrane; alternatively, the filter element within the membrane filter 12 is a tubular filtration membrane.

Preferably, the number of membrane filters in each of the plurality of filtration modules is uniform. In other words, the number of the membrane filters 12 in each of the plurality of filter modules 11 is the same, so that the flow rate and the pressure distribution of the membrane filters 12 of each filter module 11 in the state of filtration or cleaning are uniform. Therefore, when in cleaning, each filter module 11 is ensured to be fully cleaned, and the problem that one of the filter modules 11 with smaller number of the membrane filters 12 adopts larger cleaning flow rate due to inconsistent number of the membrane filters 12 in the filter modules 11 is avoided, so that the energy consumption and the cleaning efficiency of the filter device 100 in the embodiment of the invention are reduced.

In some embodiments, as shown in fig. 1, a fifth line 25 is used to drain the retentate, the fifth line 25 is in communication with the retentate outlet 113 of the last filtration module 11, and a fourth control valve 34 is provided on the fifth line 25. In the cleaning mode, the fourth control valve 34 is closed so that the cleaning liquid cannot be discharged from the fifth pipe 25, thereby improving cleaning efficiency. In filtration mode, fourth control valve 34 is opened to allow retentate filtered by the last filtration module 11 to be discharged from fifth line 25.

Further, the filtering device 100 according to the embodiment of the invention further includes a mode of cleaning the liquid to be filtered.

The first control valve 31, the second control valve 32 and the fourth control valve 34 are closed, the plurality of third control valves 33 are opened, the liquid to be filtered is introduced into the feed port 111 of the first filtration module 11, the liquid to be filtered sequentially passes through the plurality of filtration modules 11, the plurality of filtration modules 11 are rinsed, and the liquid to be filtered is discharged through the third pipeline 23.

In some embodiments, as shown in fig. 1 and 2, one end of the return line 26 communicates with the feed port 111 of the first filtration module 11, the other end of the return line 26 communicates with the retentate outlet 113 of the last filtration module 11, and a fifth control valve 35 is provided on the return line 26. In the filtration mode, the fifth control valve 35 is opened to allow at least a portion of the retentate filtered by the last filtration module 11 to be re-fed into the first filtration module 11 via the return line 26 for re-filtration, thereby further improving the filtration efficiency.

In some embodiments, as shown in fig. 1 and 2, a first flow control valve 36 is provided on the first conduit 2 and a second flow control valve 37 is provided on the fifth conduit 25. Thereby facilitating control of the input amount of the cleaning liquid and the discharge amount of the retentate through the first flow control valve 36 and the second flow control valve 37, thereby further improving the practicality of the filtering apparatus 100 of the embodiment of the present invention.

In some embodiments, as shown in fig. 1 and 2, a sixth pipe is used for inputting the liquid to be filtered, one end of the sixth pipe is communicated with the feed port 111 of the first filtration module 11, and the other end of the sixth pipe is adapted to be communicated with the outside. Thereby facilitating the delivery of the liquid to be filtered into the first filter module 11 through the sixth pipeline, and further improving the practicality of the filter device 100 according to the embodiment of the present invention.

The liquid supply system of the present embodiment includes the filtering apparatus 100 of any of the above embodiments. The filtering device 100 of the liquid supply system according to the embodiment of the present invention can be connected to the first pipeline 2 and the second pipeline 22 by switching the permeate outlets 112 of the plurality of filtering modules 11, so that not only can the permeate outlet 112 be connected to the first pipeline 2 be switched, but also the permeate obtained after filtering the liquid to be filtered is discharged through the first pipeline 2, thereby completing the collection of the permeate. And the permeate outlet 112 can be switched to be connected with the second pipeline 22, so that cleaning liquid reversely enters the plurality of filter modules 11 to clean the filter modules 11, thereby preventing the filter modules 11 from being blocked, improving the liquid supply system of the embodiment of the invention, being not easy to be blocked and being convenient to clean.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

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 at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, 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; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. A filter device, comprising:

a first pipe for discharging permeate and a second pipe for inputting cleaning liquid;

a filtration assembly comprising a plurality of filtration modules, a plurality of said filtration modules being disposed in series, each filtration module comprising a feed inlet, a permeate outlet and a retentate outlet, the retentate outlets of the remaining ones of the plurality of filtration modules except the first being connected to the feed inlet of the filtration module upstream and immediately thereabout, the feed inlet of the first one of the plurality of filtration modules being adapted to communicate with the outside, the retentate outlet of the last one of the plurality of filtration modules being adapted to communicate with the outside, and the permeate outlet of each filtration module being selectively connected to the first and second conduits;

and the third pipelines are used for discharging cleaning liquid and are connected with the retentate outlets of the filtering modules in a one-to-one correspondence manner.

2. The filter device according to claim 1, further comprising:

the first pipeline comprises a plurality of first main pipelines and a plurality of second pipelines, the first main pipelines comprise a first port and a plurality of second ports, one end of each first pipeline is connected with the permeate outlet, the other end of each first pipeline is connected with the first port, the first pipeline comprises a first liquid inlet, the second pipeline comprises a first liquid outlet, and the second ports are communicated with the first liquid inlet and the first liquid outlet;

the first control valve is arranged on the first pipeline, and the second control valve is arranged on the second pipeline.

3. The filter device according to claim 1, further comprising: the plurality of third control valves are arranged on the plurality of third pipelines in a one-to-one correspondence manner.

4. The filter arrangement of claim 1, wherein each of the filter modules comprises: a plurality of membrane filters, each membrane filter comprising an inlet end, a permeate discharge end and a retentate discharge end, the permeate discharge end of each membrane filter being connected to its corresponding first branch line;

the second branch pipelines comprise a plurality of second liquid inlets and second liquid outlets, and the second liquid outlets of the plurality of second branch pipelines are connected with the inlet ends of the plurality of membrane filters in a one-to-one correspondence manner; and

the plurality of third pipelines comprise a third liquid inlet and a third liquid outlet, and the third liquid inlets of the plurality of third pipelines are connected with the retentate discharge ends of the plurality of membrane filters in a one-to-one correspondence manner;

the second liquid inlets of the first one of the filter modules are communicated with the outside, the second liquid inlets of the other filter modules except the first one of the filter modules are communicated with the third liquid outlets of the filter modules which are positioned upstream and close to the first one of the filter modules, and the third pipelines are communicated with the third liquid outlets of the corresponding filter modules.

5. The filter apparatus of claim 4, wherein the number of membrane filters in each of the plurality of filter modules is uniform.

6. The filter device of claim 4 or 5, wherein the filter element within the membrane filter is one of a roll-to-roll filter membrane and a tubular filter membrane.

7. The filter arrangement according to any one of claims 1-5, further comprising: a fifth line for discharging retentate, said fifth line being in communication with the retentate outlet of the last of said filtration modules;

and the fourth control valve is arranged on the fifth pipeline.

8. The filter device of claim 7, further comprising: a return line, one end of which is in communication with the feed inlet of the first filtration module, and the other end of which is in communication with the retentate outlet of the last filtration module;

a fifth control valve provided on the return line;

and one end of the sixth pipeline is communicated with the feed inlet of the first filtering module, and the other end of the sixth pipeline is suitable for being communicated with the outside.

9. The filter device of claim 7, further comprising: the first flow control valve is arranged on the first pipeline, and the second flow control valve is arranged on the fifth pipeline.

10. A liquid supply system comprising a filter device according to any one of claims 1-9.