Method for combining filter device by using plug-in mounting type flat sheet membrane components, filter device formed by combining and filter system

Abstract

The invention discloses a method for combining a filter device by using plug-in mounting type flat sheet membrane components, and the filter device and a filter system formed by combining the plug-in mounting type flat sheet membrane components. The plug-in mounting type flat sheet membrane components comprise I-shaped plug-in mounting type flat sheet membrane components and II-shaped plug-in mounting type flat sheet membrane components; each of the I-type plug-in type flat membrane component and the II-type plug-in type flat membrane component comprises an upper connecting piece, a lower connecting piece, a groove-shaped plate and a plurality of membranes, two ends of the groove-shaped plate are detachably connected with the upper connecting piece and the lower connecting piece, so that the upper connecting piece and the lower connecting piece are relatively fixed, and the plurality of membranes are fixed between the upper connecting piece and the lower connecting piece; a water collecting box is also arranged at the upper end of the upper connecting piece of the I-shaped plug-in mounting type flat sheet membrane component, and is communicated with water outlets of the plurality of membranes; at least two of a filtering device I, a filtering device II and a filtering device III can be formed by combining the I-shaped plug-in mounting type flat sheet membrane component and the II-shaped plug-in mounting type flat sheet membrane component. The filter device and the filter system with three different structures can be combined according to different use occasions, so that the filter device and the filter system are more convenient to mount and maintain and higher in adaptability.

Description

Technical Field

[0001] The present invention relates to a filtering device for solid-liquid separation, and in particular to a method for assembling a filtering device by utilizing a plug-in flat membrane assembly, and a filtering device and a filtering system formed by the assembly. Background Art

[0002] Hollow flat membranes made of organic or inorganic materials are commonly used as filter media in various fine filtration applications. In practice, the flat membranes are sealed at both ends with plugs, and a tubular connection is formed on one end of the plug, with the central hole of the connection communicating with the internal hole. Each flat membrane's connection is connected to a water collection pipe via a quick connector, which is then connected to the system's main water pipe. The inventors describe solutions for flat membrane filtration devices or systems in patents ZL201720609067.4, entitled "A Modular Online Backwashing Flat Ceramic Membrane Filtration System," and ZL201720608695.0, entitled "A Submerged Modular Flat Ceramic Membrane Filtration System." These filtration devices and systems utilize membrane assemblies instead of membranes for assembly, significantly reducing on-site installation workload, significantly increasing filtration flux, and improving backwashing efficiency. Two different structural configurations are available, suitable for operation under positive or negative pressure conditions. However, the diaphragms used in the membrane module are connected to the connectors by gluing to form a whole. Since the diaphragms and connectors are two different materials, the bonding is prone to debonding during use, causing leakage. The glued membrane assembly is a rigid body installed on the box body, which is easily damaged by the structure and stress. The phenomenon of diaphragm damage is particularly prominent in positive pressure operation and backwashing processes. If one or more diaphragms in the membrane module are damaged, it is very difficult to replace a single piece and they need to be replaced in groups, resulting in high maintenance costs. In addition, the structural methods of flat membrane assemblies, filtration devices and filtration units cannot fully meet the requirements of all working conditions. Summary of the Invention

[0003] The purpose of the present invention is to address the defects of the existing technology and propose a method for combining a filter device using plug-in flat membrane components and a filter device and a filter system formed by the combination, so that installation and maintenance are more convenient and adaptable.

[0004] The technical solution provided by the present invention is:

[0005] A method for forming a filtering device using a plug-in flat-plate membrane assembly, wherein the plug-in flat-plate membrane assembly includes a type I plug-in flat-plate membrane assembly and a type II plug-in flat-plate membrane assembly; the type I plug-in flat-plate membrane assembly and the type II plug-in flat-plate membrane assembly each include an upper connecting member, a lower connecting member, a grooved plate, and a plurality of membrane sheets, wherein both ends of the grooved plate are fixed to the upper connecting member and the lower connecting member so that the upper connecting member and the lower connecting member are detachably connected, and the plurality of membrane sheets are fixed between the upper connecting member and the lower connecting member; the type I plug-in flat-plate membrane assembly The upper end of the upper connecting member is also provided with a water collecting box, and the water collecting box is connected to the water outlets of multiple membranes; the type I plug-in flat-plate membrane assembly and the type II plug-in flat-plate membrane assembly can form at least two of the filter device 1, the filter device 2, and the filter device 3; the filter device 1 includes a clean water main pipe, a type I plug-in flat-plate membrane assembly, and a backwash main pipe. The clean water main pipe and the backwash main pipe are respectively provided with a clean water outlet valve 1 and a backwash inlet valve 1. A plurality of connecting branches with plug-in ports are connected in parallel between the clean water main pipe and the backwash main pipe. The type I plug-in flat-plate membrane components are respectively inserted into each insertion port, forming a matrix arrangement in rows and columns on the horizontal plane; the second filtering device includes a box body, a type II plug-in flat-plate membrane component, a clean water outlet valve and a backwash inlet valve. The upper part of the box body is a semi-enclosed clean water chamber. The bottom plate of the clean water chamber is a perforated plate. The type II plug-in flat-plate membrane component is inserted into the perforated plate of the clean water chamber, and is arranged in rows and columns in a matrix. The clean water outlet valve and the backwash inlet valve are arranged on either side of the clean water chamber. The filtering device The three include box body two, a slag discharge valve, a water inlet valve, a type II plug-in flat-plate membrane assembly, a clean water outlet valve three, and a backwash inlet valve three. The upper part of the box body is a semi-enclosed clean water chamber two, the middle part is a filter chamber, and the lower part is a cone bucket. The bottom plate of the clean water chamber two is a orifice plate. The type II plug-in flat-plate membrane assembly is inserted on the orifice plate of the clean water chamber two, and is arranged in a matrix in rows and columns. The clean water outlet valve three and the backwash inlet valve three are arranged on any side of the clean water chamber two, the water inlet valve is arranged on any side of the upper part of the cone bucket, and the sewage valve is arranged at the lower end of the cone bucket.

[0006] A filtering device includes a clean water main pipe, an I-type plug-in flat-plate membrane assembly, and a backwash main pipe. The clean water main pipe and the backwash main pipe are respectively provided with a clean water outlet valve and a backwash inlet valve. A plurality of connecting branches with plug-in ports are connected in parallel between the clean water main pipe and the backwash main pipe. A plurality of the I-type plug-in flat-plate membrane assemblies are respectively plugged into each plug-in port to form a matrix arrangement in rows and columns on a horizontal plane. The I-type plug-in flat-plate membrane assembly includes an upper connecting piece, a lower connecting piece, a groove plate, and a plurality of diaphragms. The two ends of the groove plate are detachably connected to the upper connecting piece and the lower connecting piece, so that the upper connecting piece and the lower connecting piece are relatively fixed, and the plurality of diaphragms are fixed between the upper connecting piece and the lower connecting piece. The I-type plug-in flat-plate membrane assembly is also provided with a water collecting box at the upper end of the upper connecting piece, and the water collecting box is connected to the water outlets of the plurality of diaphragms.

[0007] Among them, each connecting branch is provided with multiple plug-in short tubes, and the plug-in port is located at the end of the plug-in short tube. Multiple I-type plug-in flat-plate membrane modules are respectively connected to the plug-in ports of the connecting branch through connecting sleeves and clamps.

[0008] It also includes a bracket and a membrane group bracket 1 arranged at the bottom of the bracket. The membrane group bracket 1 is a hollow structure with an opening corresponding to the center position of the lower part of each I-type plug-in flat-plate membrane component to facilitate the insertion of the protruding part of the bottom of the I-type plug-in flat-plate membrane component.

[0009] A filtering device comprises a casing, a type II plug-in flat-plate membrane assembly, two clean water outlet valves and two backwash inlet valves, the upper portion of the casing being a semi-enclosed clean water chamber, the bottom plate of the clean water chamber being a perforated plate, the type II plug-in flat-plate membrane assembly being plugged into the perforated plate of the clean water chamber and arranged in a matrix in rows and columns, the clean water outlet valves and the backwash inlet valves being arranged on either side of the clean water chamber; the type II plug-in flat-plate membrane assembly comprises an upper connecting member, a lower connecting member, a grooved plate and a plurality of diaphragms, the two ends of the grooved plate being detachably connected to the upper connecting member and the lower connecting member so that the upper connecting member and the lower connecting member are relatively fixed, and the plurality of diaphragms are fixed between the upper connecting member and the lower connecting member.

[0010] Among them, the lower part of the box body 1 is a frame structure, and a membrane group bracket 2 is provided at the bottom of the frame structure. The membrane group bracket 2 is a hollow structure, and a hole is opened at the center position of the lower part of each type II plug-in flat-plate membrane assembly to facilitate the insertion of the protruding part of the bottom of the type II plug-in flat-plate membrane assembly.

[0011] A filtering device comprises a second box body, a slag discharge valve, a water inlet valve, a type II plug-in flat-plate membrane assembly, three clean water outlet valves, and three backwash inlet valves. The upper part of the box body is a semi-enclosed clean water chamber II, the middle part is a filter chamber, and the lower part is a cone bucket. The bottom plate of the second clean water chamber is a perforated plate. The type II plug-in flat-plate membrane assembly is inserted on the perforated plate of the second clean water chamber and arranged in a matrix in rows and columns. The three clean water outlet valves and the three backwash inlet valves are arranged on either side of the second clean water chamber, the water inlet valve is arranged on either side of the upper part of the cone bucket, and the sewage valve is arranged at the lower end of the cone bucket. The type II plug-in flat-plate membrane assembly comprises an upper connecting piece, a lower connecting piece, a groove plate, and multiple diaphragms. The two ends of the groove plate are detachably connected to the upper connecting piece and the lower connecting piece, so that the upper connecting piece and the lower connecting piece are relatively fixed, and multiple diaphragms are fixed between the upper connecting piece and the lower connecting piece.

[0012] Among them, a membrane group bracket three is provided at the lower part of the filter chamber. The membrane group bracket three is a hollow structure, and a hole is opened at the center position of the lower part of each type II plug-in flat membrane assembly to facilitate the insertion of the protruding part of the bottom of the type II plug-in flat membrane assembly.

[0013] Among them, the lower part of the second box body is provided with supporting feet for fixing and supporting the second box body.

[0014] A filtration system is composed of multiple filtration devices of the same specifications and structures, with backwash ports and clean water ports connected to the system main pipe through valves respectively. The filtration devices are the filtration devices described above.

[0015] The present invention utilizes a method for combining plug-in flat-plate membrane assemblies into a filtration device, and the filtration device and filtration system formed by the combination. By adopting type I plug-in flat-plate membrane assemblies and type II plug-in flat-plate membrane assemblies with different structural forms, three filtration devices and filtration systems with different structures can be combined for different usage occasions, thereby making installation and maintenance more convenient and adaptable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 1 is a schematic structural diagram of a type I plug-in flat-plate membrane module in an embodiment of the present invention.

[0017] Figure 2 Schematic diagram of the structure of the type II plug-in flat membrane module in an embodiment of the present invention.

[0018] Figure 3 This is a front view of a filtering device according to an embodiment of the present invention.

[0019] Figure 4 yes Figure 3 The left side view of the filter device 1 is shown.

[0020] Figure 5 yes Figure 3 A top view of the filter device 1 is shown.

[0021] Figure 6 This is a front view of a second filter device according to a second embodiment of the present invention.

[0022] Figure 7 yes Figure 6 The left side view of the filter device 2 is shown.

[0023] Figure 8 yes Figure 6 A top view of the second filter device is shown.

[0024] Figure 9 This is a front view of a third filter device according to embodiment 3 of the present invention.

[0025] Figure 10 yes Figure 9 The left side view of the filter device three is shown.

[0026] Figure 11 yes Figure 9 A top view of the filter device three is shown.

[0027] Figure 12 is Figure 3The structural diagram of the filtration system composed of the filtration device 1 is shown. DETAILED DESCRIPTION

[0028] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0029] Figures 1 and 2 The diagrams below are schematic diagrams of the structures of two different types of plug-in flat-plate membrane modules. Each plug-in flat-plate membrane module includes an upper connector 11, a lower connector 12, a trough plate 13, and multiple diaphragms 14. The ends of the trough plate 13 are detachably connected to the upper and lower connectors 11, 12, securing the upper and lower connectors 11, 12 relative to each other. The multiple diaphragms 14 are secured between the upper and lower connectors 11, 12.

[0030] The plug-in flat-plate membrane assembly includes a type I plug-in flat-plate membrane assembly 2 and a type II plug-in flat-plate membrane assembly 3 .

[0031] The Type I plug-in flat-plate membrane module 2 is also equipped with a water collection box 15 at the upper end of the upper connector 11. This water collection box 15 connects to the water outlets of the multiple membranes 14. In this embodiment, the water collection box 15 is a semi-enclosed hollow body with a flange structure. One end of the water collection box 15 is connected to the water outlets of the multiple membranes 14, and the other end is equipped with a plug-in outlet pipe 16, which can be directly connected to the plug-in port on the pipe via a sleeve and a clamp.

[0032] The type II plug-in flat membrane assembly 3 does not have a water collecting box and is inserted into the orifice plate of the water purification chamber of the box structure through the flange on the upper connecting piece 11 and fixed by bolts.

[0033] The Type I plug-in flat-plate membrane assembly and the Type II plug-in flat-plate membrane assembly can be used to combine three different structures of filtration devices and filtration systems for different usage occasions. The three different structures of filtration devices are described below and are named filtration device 1, filtration device 2, and filtration device 3 respectively.

[0034] Figures 3 to 5 This is a schematic diagram of the structure of a filter device 1 according to an embodiment of the present invention. The filter device 1 includes a clean water main pipe 102, a clean water outlet valve 101, a connecting branch pipe 103, a clamp 104, a connecting sleeve 105, an I-type plug-in flat-plate membrane module 106, a backwash main pipe 108, a backwash inlet valve 107, and a bracket 109.

[0035] Furthermore, multiple connecting branches 103 are connected in parallel between the clean water main pipe 102 and the backwash main pipe 108. Each connecting branch 103 has multiple short plug-in tubes. I-type plug-in flat-plate membrane modules 106 are connected to the various plug-in ports of the connecting branches 103 via connecting sleeves 105 and clamps 104, forming a matrix arrangement in rows and columns on a horizontal plane.

[0036] Furthermore, a clean water outlet valve 101 and a backwash inlet valve 107 are provided on the water inlet main pipe and the backwash main pipe 108, respectively, which can be opened and closed at different times by an electronic control device to achieve intermittent operation of filtration or backwashing.

[0037] Furthermore, the membrane group bracket 109-1 provided at the bottom of the bracket 109 is a hollow structure, with a hole corresponding to the center position of the lower part of each I-type plug-in flat membrane assembly 106, so as to facilitate the insertion of the protruding part at the bottom of the I-type plug-in flat membrane assembly 106 to achieve positioning and anti-swing functions.

[0038] Figures 6 to 8 1 is a schematic structural diagram of a second filter device according to an embodiment of the present invention. The second filter device comprises a housing 201, a type II plug-in flat membrane assembly 202, a second purified water outlet valve 203, and a second backwash inlet valve 204.

[0039] Furthermore, the upper portion of the housing 201 comprises a semi-enclosed water purification chamber 201-2. The bottom plate 201-3 of the water purification chamber 201-2 is an orifice plate. Type II plug-in flat-plate membrane assemblies 202 are inserted onto the orifice plate of the water purification chamber 201-2, arranged in a matrix arrangement and secured with bolts. An inspection door 201-1 is located above the water purification chamber 201-2. The lower portion of the housing 201 comprises a frame structure, at the bottom of which a membrane assembly bracket 201-4 is provided. This hollow structure features a central opening corresponding to the lower portion of each Type II plug-in flat-plate membrane assembly 202. This allows for the insertion of the protruding bottom portion of the Type II plug-in flat-plate membrane assembly 202, providing positioning and anti-swaying functions.

[0040] Furthermore, the second purified water outlet valve 203 and the second backwash inlet valve 204 are arranged on either side of the first purified water chamber 201-2, and are opened and closed at different times by the electronic control device to achieve intermittent operation of filtration or backwashing.

[0041] Figures 9 to 11 The third filter device comprises a second housing 301, a slag discharge valve 303, a water inlet valve 306, a second type II plug-in flat membrane module 302, a third purified water outlet valve 304, and a third backwash inlet valve 306.

[0042] Furthermore, the upper portion of the second housing 301 comprises a semi-enclosed water purification chamber 301-2, the middle portion comprises a filtration chamber 301-4, and the lower portion comprises a cone hopper 301-6. The bottom plate 301-3 of the second water purification chamber 301-2 is a perforated plate. The second type II plug-in flat-plate membrane assemblies 302 are mounted on the second perforated plate of the second water purification chamber 301-2, arranged in a matrix arrangement in rows and columns and secured by bolts. An inspection door 301-1 is provided at the upper portion of the second water purification chamber 301-2. A membrane assembly bracket 301-5 is provided at the lower portion of the filtration chamber. This hollow structure features a hole corresponding to the center position of the lower portion of each second type II plug-in flat-plate membrane assembly 302, facilitating the insertion of the protruding portion at the bottom of the second type II plug-in flat-plate membrane assembly 302, thereby achieving positioning and anti-swaying functions.

[0043] Furthermore, the purified water outlet valve 304 and the backwash inlet valve 306 are located on either side of the purified water chamber 2 301-2. Electronically controlled, they are opened and closed at different times, enabling intermittent operation of filtration or backwash. The inlet valve 306 is located on either side of the upper portion of the cone hopper. The drain valve is located at the lower end of the cone hopper.

[0044] Furthermore, a support leg 301 - 7 is provided at the lower portion of the second box body 301 for fixing and supporting the second box body 301 .

[0045] Figure 12 A large filtration system is formed by using multiple filter devices 1 of the same specifications and structure as described in Example 1, with the backwash port and the clean water port connected to the system main pipe through valves. Filter devices 2 and 3 in Examples 2 and 3 can also be used to form a filtration system in a similar manner.

Claims

1. A method for combining a plug-in flat membrane assembly into a filtration device, characterized in that: The plug-in flat-plate membrane assembly includes a type I plug-in flat-plate membrane assembly and a type II plug-in flat-plate membrane assembly; the type I plug-in flat-plate membrane assembly and the type II plug-in flat-plate membrane assembly both include an upper connecting piece, a lower connecting piece, a grooved plate, and a plurality of membranes, the ends of the grooved plate are detachably connected to the upper connecting piece and the lower connecting piece, so that the upper connecting piece and the lower connecting piece are relatively fixed, and the plurality of membranes are fixed between the upper connecting piece and the lower connecting piece; the type I plug-in flat-plate membrane assembly is also equipped with a water collecting box at the upper end of the upper connecting piece, The water collecting box is connected to the water outlets of multiple membranes; the type I plug-in flat membrane assembly and the type II plug-in flat membrane assembly can be combined into at least two of the filter device 1, the filter device 2, and the filter device 3; the filter device 1 includes a clean water main pipe, a type I plug-in flat membrane assembly, and a backwash main pipe. The clean water main pipe and the backwash main pipe are respectively provided with a clean water outlet valve 1 and a backwash inlet valve 1. A plurality of connecting branches with plug-in ports are connected in parallel between the clean water main pipe and the backwash main pipe. The components are respectively inserted into each insertion port to form a matrix arrangement in rows and columns on the horizontal plane; the second filtering device includes a box body, a type II plug-in flat membrane component, a clean water outlet valve 2 and a backwash inlet valve 2, the upper part of the box body is a semi-enclosed clean water chamber 1, the bottom plate of the clean water chamber 1 is a perforated plate, the type II plug-in flat membrane component is inserted into the perforated plate of the clean water chamber 1, and is arranged in rows and columns in a matrix arrangement, and the clean water outlet valve 2 and the backwash inlet valve 2 are arranged on either side of the clean water chamber 1; the third filtering device includes a box body 2. Slag discharge valve, water inlet valve, type II plug-in flat-plate membrane assembly, clean water outlet valve 3, backwash inlet valve 3. The upper part of the box body is a semi-enclosed clean water chamber 2, the middle part is a filter chamber, the lower part is a cone bucket, the bottom plate of the clean water chamber 2 is a orifice plate, and the type II plug-in flat-plate membrane assembly is inserted on the orifice plate of the clean water chamber 2, arranged in rows and columns in a matrix. The clean water outlet valve 3 and the backwash inlet valve 3 are arranged on either side of the clean water chamber 2, the water inlet valve is arranged on either side of the upper part of the cone bucket, and the sewage valve is arranged at the lower end of the cone bucket.

2. A filtering device, characterized in that: It includes a clean water main pipe, an I-type plug-in flat-plate membrane assembly, and a backwash main pipe. The clean water main pipe and the backwash main pipe are respectively provided with a clean water outlet valve and a backwash inlet valve. A plurality of connecting branches with plug-in ports are connected in parallel between the clean water main pipe and the backwash main pipe. A plurality of the I-type plug-in flat-plate membrane assemblies are respectively plugged into each plug-in port to form a matrix arrangement in rows and columns on a horizontal plane. The I-type plug-in flat-plate membrane assembly includes an upper connecting piece, a lower connecting piece, a groove plate, and a plurality of diaphragms. The two ends of the groove plate are detachably connected to the upper connecting piece and the lower connecting piece, so that the upper connecting piece and the lower connecting piece are relatively fixed, and the plurality of diaphragms are fixed between the upper connecting piece and the lower connecting piece. The I-type plug-in flat-plate membrane assembly is also provided with a water collecting box at the upper end of the upper connecting piece, and the water collecting box is connected to the water outlets of the plurality of diaphragms.

3. The filtering device according to claim 2, characterized in that: Each connecting branch is provided with a plurality of short plug-in tubes, the plug-in ports are located at the ends of the short plug-in tubes, and the plurality of I-type plug-in flat-plate membrane modules are respectively connected to the plug-in ports of the connecting branch through connecting sleeves and clamps.

4. The filtering device according to claim 2, characterized in that: It also includes a bracket and a membrane group bracket 1 arranged at the bottom of the bracket. The membrane group bracket 1 is a hollow structure with an opening corresponding to the center position of the lower part of each I-type plug-in flat membrane component to facilitate the insertion of the protruding part of the bottom of the I-type plug-in flat membrane component.

5. A filtering device, characterized in that: It includes a box body, a type II plug-in flat-plate membrane assembly, a clean water outlet valve and a backwash inlet valve. The upper part of the box body is a semi-enclosed clean water chamber. The bottom plate of the clean water chamber is a orifice plate. The type II plug-in flat-plate membrane assembly is inserted on the orifice plate of the clean water chamber and arranged in a matrix in rows and columns. The clean water outlet valve and the backwash inlet valve are arranged on either side of the clean water chamber. The type II plug-in flat-plate membrane assembly includes an upper connecting piece, a lower connecting piece, a groove plate, and multiple diaphragms. The two ends of the groove plate are detachably connected to the upper connecting piece and the lower connecting piece, so that the upper connecting piece and the lower connecting piece are relatively fixed, and the multiple diaphragms are fixed between the upper connecting piece and the lower connecting piece.

6. The filtering device according to claim 5, characterized in that: The lower part of the box body 1 is a frame structure, and a membrane group bracket 2 is provided at the bottom of the frame structure. The membrane group bracket 2 is a hollow structure, and a hole is opened at the center position of the lower part of each type II plug-in flat-plate membrane component to facilitate the insertion of the protruding part of the bottom of the type II plug-in flat-plate membrane component.

7. A filtering device, characterized in that: It includes box body 2, a slag discharge valve, a water inlet valve, a type II plug-in flat-plate membrane assembly, three clean water outlet valves, and three backwash inlet valves. The upper part of the box body is a semi-enclosed clean water chamber 2, the middle part is a filter chamber, and the lower part is a cone bucket. The bottom plate of the clean water chamber 2 is a perforated plate. The type II plug-in flat-plate membrane assembly is inserted on the perforated plate of the clean water chamber 2 and arranged in a matrix in rows and columns. The clean water outlet valve 3 and the backwash inlet valve 3 are arranged on either side of the clean water chamber 2, the water inlet valve is arranged on either side of the upper part of the cone bucket, and the sewage valve is arranged at the lower end of the cone bucket; the type II plug-in flat-plate membrane assembly includes an upper connecting part, a lower connecting part, a groove plate, and multiple diaphragms. The two ends of the groove plate are detachably connected to the upper connecting part and the lower connecting part, so that the upper connecting part and the lower connecting part are relatively fixed, and multiple diaphragms are fixed between the upper connecting part and the lower connecting part.

8. The filtering device according to claim 7, characterized in that: A membrane group bracket three is provided at the bottom of the filter chamber. The membrane group bracket three is a hollow structure and has a hole corresponding to the center position of the bottom of each type II plug-in flat membrane component to facilitate the insertion of the protruding part of the bottom of the type II plug-in flat membrane component.

9. The filtering device according to claim 7, characterized in that: The lower part of the second box body is provided with supporting feet for fixing and supporting the second box body.

10. A filtration system, characterized in that: It is composed of multiple filtering devices of the same specifications and structures, and the backwash port and the clean water port are connected to the system main pipe through valves respectively. The filtering device is the filtering device as described in any one of claims 2 to 9.

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