Immersed membrane module

Abstract

The utility model discloses an immersed membrane module which comprises an upper end cover, a lower end cover, a supporting rod fixed between the upper end cover and the lower end cover and a plurality of hollow fiber membrane tow units, each hollow fiber membrane tow unit comprises an upper inserting piece, a lower inserting piece and a plurality of hollow fiber membrane filaments, and the hollow fiber membrane filaments are of a closed annular structure. The hollow fiber membrane filaments in each hollow fiber membrane filament bundle unit are arranged in the transverse direction, the upper insertion piece transversely penetrates through the upper ends of the hollow fiber membrane filaments, the lower insertion piece transversely penetrates through the lower ends of the hollow fiber membrane filaments, and the upper insertion piece and the lower insertion piece are matched to stretch the whole hollow fiber membrane filament bundle unit up and down to be in a stretching state; the upper end cover and the lower end cover are both rectangular, the hollow fiber membrane tow units are arranged in a row in the longitudinal direction, the upper inserting piece is inserted into the upper end cover, the lower inserting piece is inserted into the lower end cover, and the lower end cover is connected with an anchor piece which fixes the lower inserting piece and the lower end cover in a buckled mode. According to the utility model, the hollow fiber membrane tow unit can be integrally assembled conveniently.

Description

[Technical field]

[0001] The utility model belongs to the technical field of water treatment, and in particular relates to an immersed hollow fiber membrane component. [Background technology]

[0002] Hollow fiber membrane technology is widely used in the water treatment industry. It is an asymmetric (non-uniform) self-supporting filter membrane. The operation process is generally a cross-flow filtration method to maximize the water production efficiency. Backwashing is performed at intervals during the process to maintain a high separation efficiency of the hollow fiber membrane. Macromolecular organic matter, colloids, algae, bacteria, viruses, endotoxins, particles and other substances are efficiently retained.

[0003] Hollow fiber membranes are self-supporting and have a fiber-like appearance. The outer diameter of the fiber is usually 1.2-3.0 mm and the inner diameter is 0.6-1.5 mm. The fiber bundles of 1-3 meters are loaded into a high-pressure resistant metal shell or plastic membrane shell. One end of the fiber bundle is sealed and the other end is bonded with a specially formulated epoxy resin.

[0004] In the prior art, the U-shaped portion at the lower end of the hollow fiber membrane is connected to the plug-in, and the plug-in and the lower end cover are fixed by interference fit, which makes the plug-in process difficult and inconvenient to install. [Contents of the utility model]

[0005] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an immersed membrane assembly, which is convenient for straightening hollow fiber membranes and assembling the hollow fiber membrane bundle unit as a whole.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions: an immersed membrane assembly, comprising an upper end cover, a lower end cover, a support rod fixed between the upper end cover and the lower end cover, and a plurality of hollow fiber membrane bundle units arranged between the upper end cover and the lower end cover, wherein the hollow fiber membrane bundle unit comprises an upper insert, a lower insert and a plurality of hollow fiber membranes, the hollow fiber membranes are a closed annular structure, the hollow fiber membranes in each hollow fiber membrane bundle unit are arranged in a transverse direction, and the upper insert passes through the upper end of the hollow fiber membranes in a transverse direction, and the lower insert passes through the lower end of the hollow fiber membranes in a transverse direction, and the upper insert and the lower insert cooperate to stretch the entire hollow fiber membrane bundle unit up and down into a stretched state;

[0007] The upper end cover and the lower end cover are both rectangular, and a plurality of hollow fiber membrane bundle units are arranged in a row along the longitudinal direction, and the upper plug is inserted into the upper end cover, and the lower plug is inserted into the lower end cover, and the lower end cover is connected to an anchor that fixes the lower plug and the lower end cover.

[0008] Preferably, the lower end cover comprises a rectangular outer frame and a row of lower slots arranged along the longitudinal direction on the inner side of the rectangular outer frame, and the lower inserting pieces are inserted into the lower slots.

[0009] Preferably, lower plug posts are provided at both lateral ends of the lower plug sheet, and the lower plug posts protrude toward both longitudinal sides of the lower plug sheet. The lower slot is arranged with equal width in the lateral direction. The lower plug posts at both lateral ends of the lower plug sheet correspond to and are inserted into the two lateral ends of the lower slot. The lower end of the hollow fiber membrane is arranged between the lower plug posts at both lateral ends of the lower plug sheet.

[0010] Preferably, a positioning boss is provided at the lower end of the lower plug column, and a positioning hole cooperating with the positioning boss is provided on the bottom wall of the lower slot.

[0011] Preferably, an anchor is provided on at least one lateral side of the lower end cover, a row of through holes is provided on at least one lateral side of the lower end cover corresponding to the end position of the lower plug-in piece, a card slot is provided at the end of the lower plug-in piece, and the anchor is provided with a card protrusion corresponding to the end of the lower plug-in piece, and the card protrusion passes through the through hole and engages with the card slot.

[0012] Preferably, the anchor is provided with a hook, and the lower end cover is provided with a hook hole at the lateral sides corresponding to the position of the hook, and the hook is engaged with the hook hole.

[0013] Preferably, the upper end cover comprises a rectangular frame, upper slots are provided on the lateral sides of the rectangular frame, and the lateral ends of the upper insert are correspondingly inserted into the two upper slots on the lateral sides of the rectangular frame.

[0014] Preferably, upper plug posts which are plugged into the upper slots are correspondingly provided at both lateral ends of the upper plug piece.

[0015] Preferably, the upper slot is a U-shaped structure with a side opening, and limiting slots are provided on both sides of the upper end of the upper slot, and limiting lugs are provided on both sides of the upper end of the upper plug column, and the limiting lugs are limitedly matched with the limiting slots.

[0016] The technical solution adopted by the utility model has the following beneficial effects:

[0017] The support rod is arranged between the upper end cover and the lower end cover, and the ends are fixed, so the fixation is reliable and the support is stable. It can withstand higher pressure during the solid-liquid separation process and prevent the deformation of the frame caused by the shrinkage of the membrane fibers.

[0018] The hollow fiber membrane is a closed ring structure, so the upper end can be plugged into the upper end cover through the upper plug, and then the lower end can be plugged into the upper end cover through the lower plug. In this way, the upper and lower plugs cooperate to stretch the entire hollow fiber membrane bundle unit up and down into a stretched state, which is convenient for installation.

[0019] Since the lower insert and the lower end cover are fixed by anchors, the lower insert and the lower end cover do not need to be fixed with interference fit, so multiple lower inserts can be easily inserted into the lower end cover side by side along the longitudinal direction, and finally the anchors can be buckled, which makes it convenient to insert and fix the lower end of the hollow fiber membrane to the lower end cover, thereby improving assembly efficiency.

[0020] These features and advantages of the present invention will be disclosed in detail in the following specific implementation manners and drawings.

Brief Description of the Drawings

[0021] The utility model is further described below in conjunction with the accompanying drawings:

[0022] Figure 1 It is a schematic diagram of the overall structure of an immersed hollow fiber membrane module;

[0023] Figure 2 It is a schematic diagram of the exploded structure of an immersed hollow fiber membrane module;

[0024] Figure 3 is a schematic diagram of the structure of the upper insert;

[0025] Figure 4 is a schematic diagram of the structure of the upper slot;

[0026] Figure 5 It is a schematic diagram of the upper structure of several hollow fiber membrane bundle units;

[0027] Figure 6 A schematic diagram of the structure of fixing the upper part of a plurality of hollow fiber membrane bundle units to the upper end cover;

[0028] Figure 7 is a schematic diagram of the matching structure between the upper insert and the upper slot;

[0029] Figure 8 This is a schematic diagram of the lower structure of an immersed hollow fiber membrane module of the utility model;

[0030] Fig. 9 is a schematic diagram of the structure of the lower insert;

[0031] Fig.10 is a schematic diagram of the structure of the anchor;

[0032] Fig.11 Schematic diagram of the bottom structure of the lower end cover;

[0033] Fig.12 It is a structural schematic diagram of the water production end cover;

[0034] In the figure: hollow fiber membrane bundle unit 1, hollow fiber membrane 11, upper insert 12, upper insert column 121, limiting lug 122, through hole 123, lower insert 13, lower insert column 131, slot 132, positioning lug 133, upper end cover 2, rectangular frame 21, upper slot 22, limiting slot 23, upper plug hole 24, lower end cover 3, rectangular outer frame 31, sinking groove 311, through hole 312, anti-error protrusion 313, locking hole 314, lower slot 32, aeration slot 33, aeration spur 331, guide surface 332, anchor 34, locking protrusion 341, hook 342, anti-error groove 343, lower plug hole 35, support rod 4, water production end cover 5, water production hole 51. [Specific implementation method]

[0035] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0036] Those skilled in the art will appreciate that, in the absence of conflict, the features in the following embodiments and implementations may be combined with each other.

[0037] The submerged hollow fiber membrane assembly of the utility model can be used for sewage treatment and recycling, solution separation and concentration, and is particularly suitable for the concentration of high-concentration organic wastewater. Figures 1 to 12 As shown, a submerged hollow fiber membrane assembly includes an upper end cover 2, a lower end cover 3, a support rod 4 fixed between the upper end cover 2 and the lower end cover 3, and a plurality of hollow fiber membrane bundle units 1 arranged between the upper end cover 2 and the lower end cover 3.

[0038] Each hollow fiber membrane bundle unit 1 is in the shape of a sheet as a whole, and can also be called a hollow fiber membrane sheet. Specifically, the hollow fiber membrane bundle unit 1 includes an upper insert 12, a lower insert 13 and a plurality of hollow fiber membrane filaments 11, wherein the hollow fiber membrane filaments 11 are a closed annular structure, i.e., an "O" shape, and the upper and lower ends thereof are both U-shaped, with both sides vertical. The plurality of hollow fiber membrane filaments in each hollow fiber membrane bundle unit 1 are arranged in a row along the horizontal direction, and overlap is avoided. Among them, the upper insert 12 passes through the upper end of the hollow fiber membrane filament horizontally, and the lower insert 13 passes through the lower end of the hollow fiber membrane filament horizontally, and the upper insert 12 and the lower insert 13 cooperate to stretch the entire hollow fiber membrane bundle unit 1 up and down into a stretched state. Therefore, the hollow fiber membrane 11 is designed in an "O" shape to facilitate the straightening of the membrane and the gluing of the upper end. In addition, after the gluing is completed, the upper end cover must be filled with epoxy resin to play a sealing role. At the same time, the upper end of the upper end cover and the upper insert 12 must be completely cut off, so that the upper end of the hollow fiber membrane 11 is cut off, and the finished hollow fiber membrane 11 is in a "U" shape.

[0039] In this embodiment, the upper end cover 2 and the lower end cover 3 are both rectangular, and a plurality of hollow fiber membrane bundle units 1 are arranged in a row along the longitudinal direction, and the upper insert is inserted into the upper end cover, and the lower insert is inserted into the lower end cover. In addition, a certain gap is provided between two adjacent hollow fiber membrane bundle units in the longitudinal direction. When treating high-concentration sewage, gas is allowed to enter the gap through aeration, so that the air scrubbing effect is better.

[0040] The lower end cover 3 includes a rectangular outer frame 31 and a row of lower slots 32 arranged longitudinally inside the rectangular outer frame, and the lower insert 13 is inserted into the lower slots 32. In order to achieve glue-free bonding of the lower end of the hollow fiber membrane bundle unit, the lower end cover 3 is connected with an anchor 34 that snaps and fixes the lower insert 13 to the lower end cover 3.

[0041] Each lower plug piece passes horizontally through the lower end of the hollow fiber membrane and is connected to the lower ends of several hollow fiber membranes in a hollow fiber membrane bundle unit, and then the multiple lower plug pieces are inserted into the lower end cover side by side along the longitudinal direction. Compared with the prior art, at least one side of the lower end cover is connected to an anchor for snapping the lower plug piece and the lower end cover. Since the lower plug piece and the lower end cover are snapped and fixed by the anchor, the lower plug piece and the lower end cover do not need to be fixed with interference fit, so that the multiple lower plug pieces can be easily inserted into the lower end cover side by side along the longitudinal direction, and finally the anchor can be snapped in, which makes it convenient to plug and fix the lower end of the hollow fiber membrane to the lower end cover, thereby improving assembly efficiency.

[0042] Since the lower inserting piece 13 is inserted into the lower slot 32 , the distance between two adjacent lower inserting pieces is fixed, thereby ensuring that the distance between two adjacent hollow fiber membrane bundle units 1 is fixed, which is beneficial to aeration.

[0043] It is understandable that the anchor may be provided only on one lateral side of the lower end cover, or the anchor 34 may be provided on both lateral sides of the lower end cover. Taking the example of providing the anchor 34 on both lateral sides of the lower end cover, through holes 312 are provided on both lateral sides of the lower end cover 3 corresponding to the end of the lower plug-in sheet, a slot 132 is provided at the end of the lower plug-in sheet, and a cam 341 is provided on the anchor 34 corresponding to the end of the lower plug-in sheet, and the cam 341 passes through the through hole 312 and engages with the slot 132. After the anchor is buckled, the cam 341 engages with the slot 132, and the lower plug-in sheet is fixed, especially the position in the up and down direction will not change, thereby ensuring that the lower end of the hollow fiber membrane bundle unit 1 is reliably fixed and does not loosen.

[0044] In order to fix the anchor to the lower end cover, a hook 342 is provided on the anchor 34, and holes 314 are provided on the lateral sides of the lower end cover at positions corresponding to the hooks, and the hooks 342 engage with the holes 314. In this way, while the anchor is fixed, the "glue-free bonding" of the lower end of the fiber membrane assembly is achieved. Specifically, a hook is provided at each of the longitudinal ends and the middle of the anchor, and three holes are provided on the lower end cover corresponding to the three hooks, that is, the anchor is fixed on both longitudinal sides and the middle, and will not be separated from the lower end cover during normal use unless disassembled.

[0045] Furthermore, the lower end cover 3 is provided with a sink groove 311 on both lateral sides, the anchor 34 is arranged in the sink groove, and the sink groove is provided with an anti-mistake protrusion 313, and the anchor 34 is provided with an anti-mistake groove 343 that cooperates with the anti-mistake protrusion. Specifically, the sink groove and the anchor are rectangular structures with rounded corners, the anti-mistake protrusion 313 is arranged in the middle of the upper side wall of the sink groove and protrudes downward, and the anti-mistake groove 343 is correspondingly arranged in the middle of the upper side of the anchor. The sink groove facilitates the installation of the anchor, and when installing the anchor, only when the anti-mistake groove 343 is aligned with the anti-mistake protrusion 313, can the anchor be installed normally, so that the clamping protrusion passes through the through hole and engages with the clamping groove, and the clamping hook engages with the clamping hole, to avoid reverse installation.

[0046] like Fig. 9 As shown, lower inserting posts 131 are provided at both lateral ends of the lower inserting sheet 13, and positioning bosses 133 are provided at the lower ends of the lower inserting posts 131. Positioning holes that match the positioning bosses 133 are correspondingly provided on the bottom wall of the lower slot 32. Not only can the position of the lower inserting sheet be positioned, but also a positioning step is formed between the upper end of the positioning boss 133 and the main body of the lower inserting post 131, ensuring that the insertion depth of the lower inserting sheet is not too large, which affects the excessive extrusion and damage of the lower end of the hollow fiber membrane.

[0047] In this embodiment, the bottom wall of the lower slot 32 is a closed structure, and the lower slot 32 extends in the entire horizontal direction and can have the same width. The lower plug post 131 is a rectangular column, which protrudes from the longitudinal sides of the lower plug sheet, and has the same thickness as the width of the lower slot. The lower plug posts at the lateral ends of the lower plug sheet correspond to the lateral ends of the lower slot, and are limited by the lateral ends of the lower slot. The lower end of the hollow fiber membrane is arranged between the lower plug posts at the lateral ends of the lower plug sheet, so there is a gap between the two sides of the hollow fiber membrane and the two side walls of the lower slot width, which facilitates the lower plug posts to be plugged in with the lateral sides of the lower slot, while avoiding affecting the arrangement of the hollow fiber membrane during the plug-in process, and also avoiding excessive extrusion and damage to the lower end of the hollow fiber membrane.

[0048] like Fig.11As shown, the lower end cover 3 is provided with a row of vertically penetrating aeration slots 33 on the inner side of the rectangular outer frame in the longitudinal direction, and the aeration slots 33 are provided on both longitudinal sides of the hollow fiber membrane bundle unit 1, and the aeration slots 33 are provided between two adjacent lower slots 32. The air introduced through the aeration slots flows upward and aerates the hollow fiber membranes, and the air diffuses upward and fully contacts the hollow fiber membranes, so that the aeration is uniform, the membranes swing more widely, and the flushing is more thorough, and no pollutants are sandwiched between the membranes, thereby improving the anti-pollution property of the hollow fiber membranes and extending the service life of the membrane components.

[0049] Furthermore, a row of aeration spikes 331 for puncturing bubbles during aeration are provided on both sides of the bottom longitudinally of the aeration groove 33. The aeration spikes are spike-like structures, such as raised triangles, which are closely arranged in the transverse direction to facilitate puncturing "large bubbles". During aeration, the aeration spikes puncture the "large bubbles" to form "small bubbles", thereby forming turbulence, causing the membrane filaments to shake more violently and flush more thoroughly, thereby reducing the amount of aeration. It is understandable that the shape, size, and arrangement density of the aeration spikes can vary. In addition, a guide surface 332 is provided between the aeration spikes 331 and the longitudinal side walls of the aeration groove 33, which can be a guide slope. After the aeration spikes puncture the "large bubbles" to form "small bubbles", they enter the aeration groove along the guide surface and then flow upward.

[0050] like Figures 3 to 7 As shown, the upper end cover 2 includes a rectangular frame 21, an upper slot 22 is provided on the lateral side of the rectangular frame, and an upper plug post 121 is provided at the end of the upper plug sheet. The upper plug post 121 is plugged into the upper slot 22, that is, the upper plug posts at the lateral ends of the upper plug sheet are correspondingly plugged into the two upper slots on the lateral sides of the rectangular frame. The upper slot 22 is a U-shaped structure, and limiting grooves 23 are provided on both sides of the U-shaped mouth of the upper slot 22, so that a T-shaped groove is formed at the upper end of the upper slot, and limiting lugs 122 are provided on both sides of the upper end of the upper plug post 121, so that a T-shaped head is formed, and the T-shaped head cooperates with the T-shaped groove, and the limiting lug 122 cooperates with the limiting groove 23. In this way, the upper plug sheet is inserted into the upper slot from top to bottom, and after being inserted into place, the upper plug sheet cannot be inserted further due to the limiting cooperation between the limiting lug 122 and the limiting groove 23.

[0051] Furthermore, the upper insert has through holes 123 spaced apart in the middle of the upper insert column along the horizontal direction. The through holes 123 connect the two sides of the upper insert so that the aeration gas can flow fully and enhance the aeration effect.

[0052] In addition, referring to the prior art, the support rods 4 are provided with four pieces, and are correspondingly arranged between the four corners of the upper end cover and the lower end cover. The upper end cover is provided with an upper plug hole 24 plugged into the upper end of the support rod, and is fixed by glue filling. The lower end cover is provided with a lower plug hole 35 plugged into the lower end of the support rod, which is also fixed by glue filling. The glue can be epoxy resin or polyurethane, and the support tube can be a square tube or a round tube, preferably a carbon fiber square tube. In the field of high acid, the carbon fiber square tube is not easily corroded. Therefore, the fixation is reliable, the support is stable, and it can withstand higher pressures during the solid-liquid separation process, and the deformation of the frame caused by the shrinkage of the membrane filaments is prevented.

[0053] like Figure 1 , Figure 2 and Fig.12 As shown, a water production end cover 5 is glued and fixed on the upper end cover 2. The water production end cover 5 is provided with a water production hole 51 and connected to the water production port, which can be anchored to the flange by screws or glued with a glue hose. A concave-convex plug-in structure is provided between the water production end cover 5 and the upper end cover 2, which can be set at the four corners or the middle of the four sides to improve the fixing reliability.

[0054] The assembly process of the submerged hollow fiber membrane module in this embodiment is briefly described as follows:

[0055] 1. The hollow fiber membrane is wound in an "O" shape, wound according to a certain number of strands, and inserted into the upper insert for standby use;

[0056] 2. Inject a certain amount of epoxy resin or polyurethane into the injection holes on the upper and lower end covers, and fix the upper and lower end covers with support rods;

[0057] 3. Insert the fiber membranes prepared in step 1 into the upper end cover one by one;

[0058] 4. Insert the fiber membrane in step 3 into the lower end cover and straighten the membrane wire at the same time;

[0059] 5. Repeat steps "3, 4" to fix the fiber diaphragm into the mold in sequence;

[0060] 6. When the fiber membranes on the mold are fixed, fix the anchors to achieve "glue-free bonding" at the lower end of the fiber membrane assembly;

[0061] 7. Install the fiber membrane assembly, turn the top upside down, put it into a special mold and fill it with epoxy resin to seal the end;

[0062] 8. The upper end of the component is cut, and the water-producing end cap is glued on after the component is cut, and then epoxy resin is poured to obtain the finished product of the "submerged membrane component".

[0063] A submerged hollow fiber membrane assembly of the present embodiment can be integrated and applied to sewage treatment equipment, for example, a sewage treatment equipment suitable for treating high-concentration organic wastewater, wherein a submerged membrane assembly described in multiple items is immersed in high-concentration organic wastewater, so that the treated liquid passes through the hollow fiber membrane to perform solid-liquid separation.

[0064] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the contents described in the drawings and the above specific implementation. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.

Claims

1. A submerged membrane assembly, comprising an upper end cover, a lower end cover, a support rod fixed between the upper end cover and the lower end cover, and a plurality of hollow fiber membrane bundle units arranged between the upper end cover and the lower end cover, characterized in that: The hollow fiber membrane bundle unit comprises an upper insert, a lower insert and a plurality of hollow fiber membranes. The hollow fiber membranes are of a closed annular structure. The hollow fiber membranes in each hollow fiber membrane bundle unit are arranged transversely, and the upper insert passes through the upper end of the hollow fiber membrane transversely, and the lower insert passes through the lower end of the hollow fiber membrane transversely. The upper insert and the lower insert cooperate to stretch the entire hollow fiber membrane bundle unit up and down into a stretched state. The upper end cover and the lower end cover are both rectangular, and a plurality of hollow fiber membrane bundle units are arranged in a row along the longitudinal direction, and the upper plug is plugged into the upper end cover, and the lower plug is plugged into the lower end cover, and the lower end cover is connected with an anchor that snaps the lower plug and the lower end cover. The lower end cover includes a rectangular outer frame and a row of lower slots arranged along the longitudinal direction on the inner side of the rectangular outer frame, the lower plug is plugged into the lower slot, and lower plug posts are provided at the lateral ends of the lower plug, and the lower plug posts protrude on the longitudinal sides of the lower plug, and the lower slot is arranged with equal width in the lateral direction, and the lower plug posts at the lateral ends of the lower plug correspond to the lateral ends of the lower slot, and the lower end of the hollow fiber membrane is arranged between the lower plug posts at the lateral ends of the lower plug.

2. The submerged membrane module according to claim 1, characterized in that: The lower end of the lower plug column is provided with a positioning protrusion, and the bottom wall of the lower slot is provided with a positioning hole matched with the positioning protrusion.

3. The submerged membrane module according to claim 1, characterized in that: An anchor is provided on at least one lateral side of the lower end cover, a row of through holes is provided on at least one lateral side of the lower end cover corresponding to the end of the lower plug-in piece, a card slot is provided at the end of the lower plug-in piece, and a card protrusion is provided on the anchor corresponding to the end of the lower plug-in piece, and the card protrusion passes through the through hole and engages with the card slot.

4. The submerged membrane module according to claim 3, characterized in that: The anchor is provided with a hook, and the lower end cover is provided with a clamping hole at the lateral sides corresponding to the position of the hook, and the hook is engaged with the clamping hole.

5. The submerged membrane module according to claim 1, characterized in that: The upper end cover comprises a rectangular frame, and upper slots are arranged on the transverse sides of the rectangular frame. The transverse ends of the upper inserting piece are correspondingly inserted into the two upper slots on the transverse sides of the rectangular frame.

6. The submerged membrane module according to claim 5, characterized in that: Upper plug posts which are plugged into the upper slots are correspondingly provided at the two lateral ends of the upper plug piece.

7. The submerged membrane module according to claim 6, characterized in that: The upper slot is a U-shaped structure with a side opening, and limiting slots are arranged on both sides of the upper end of the upper slot. Limiting lugs are arranged on both sides of the upper end of the upper plug column, and the limiting lugs are limitedly matched with the limiting slots.

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